Abstract

Purpose - The purpose of this paper is to use a combination of numerical simulation and experiment to evaluate the performance of laser surface texturing (LST) in the field of gear lubrication, and to more accurately predict the lubrication characteristics of different surfaces. Design/methodology/approach - The method used in this paper is developed on the basis of the deterministic solution of the three-dimensional (3D) mixed elasto-hydrodynamic lubrication (EHL) model and the model parameters are corrected by friction test. The film pressure, film thickness and friction coefficient of different micro-textured tooth surfaces are predicted on the basis of accurate 3D mixed EHL models. Findings - The results demonstrate that the micro-texture structure of the tooth surface can increase the local film thickness and enhance the lubricating performance of the tooth surface without drastically reducing the contact fatigue life. The stress distribution and friction characteristics of the tooth surface can be optimized by adjusting the micro-texture arrangement and the size of the micro-textures. Originality/value - A new evaluation method using a 3D hybrid EHL model and friction test to predict the lubrication characteristics of LST is proposed, which can effectively improve the processing economy and save time. Peer review - The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2020-0423


Authors

Zhao, Jiang;  Li, Zhengminqing;  Zhang, Hong;  Zhu, Rupeng

Publons users who've claimed - I am an author
Contributors on Publons
  • 1 author
  • 1 reviewer
  • pre-publication peer review (FINAL ROUND)
    Decision Letter
    2021/01/30

    30-Jan-2021

    Dear ZHAO, jiang; Li, Zhengminqing; ZHANG, Hong; peng, zhu

    It is a pleasure to accept your manuscript ilt-11-2020-0423.R4, entitled "Effect of Micro-Textures on Lubrication Characteristics of Spur Gears under 3D Line-Contact EHL Model" in its current form for publication in Industrial Lubrication and Tribology. Please note, no further changes can be made to your manuscript.

    Please go to your Author Centre at https://mc.manuscriptcentral.com/ilt (Manuscripts with Decisions for the submitting author or Manuscripts I have co-authored for all listed co-authors) to complete the Copyright Transfer Agreement form (CTA). We cannot publish your paper without this.

    All authors are requested to complete the form and to input their full contact details. If any of the contact information is incorrect you can update it by clicking on your name at the top right of the screen. Please note that this must be done prior to you submitting your CTA.

    If you have an ORCID please check your account details to ensure that your ORCID is validated.

    By publishing in this journal your work will benefit from Emerald EarlyCite. As soon as your CTA is completed your manuscript will pass to Emerald’s Content Management department and be processed for EarlyCite publication. EarlyCite is the author proofed, typeset version of record, fully citable by DOI. The EarlyCite article sits outside of a journal issue and is paginated in isolation. The EarlyCite article will be collated into a journal issue according to the journals’ publication schedule.

    FOR OPEN ACCESS AUTHORS: Please note if you have indicated that you would like to publish your article as Open Access via Emerald’s Gold Open Access route, you are required to complete a Creative Commons Attribution Licence - CCBY 4.0 (in place of the standard copyright assignment form referenced above). You will receive a follow up email within the next 30 days with a link to the CCBY licence and information regarding payment of the Article Processing Charge. If you have indicated that you might be eligible for a prepaid APC voucher, you will also be informed at this point if a voucher is available to you (for more information on APC vouchers please see http://www.emeraldpublishing.com/oapartnerships

    Thank you for your contribution. On behalf of the Editors of Industrial Lubrication and Tribology, we look forward to your continued contributions to the Journal.

    Sincerely,
    Dr. T V V L N Rao
    Guest Editor, Industrial Lubrication and Tribology
    tvvlnrao@gmail.com

    Decision letter by
    Cite this decision letter
    Reviewer report
    2021/01/30

    accept

    Reviewed by
    Cite this review
    Reviewer report
    2021/01/28

    NO comments.

    Reviewed by
    Cite this review
    Author Response
    2021/01/23

    23 January 2021
    Dr. T V V L N Rao
    Receiving Editor
    Industrial Lubrication and Tribology

    Dear Dr. T V V L N Rao:

    We thank the editors and reviewers for their valuable comments, which are very helpful for revising and improving our paper. We have studied comments carefully and have made correction.The point-to-point answers and explanations for all comments are made, and the followings are the reviewers’ comments (in black) and my replies (in red).

    We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the corrections will meet with approval.

    Responses to the reviewer’s comments:
    Reviewer #1:

    Reviewer #2:

    Comment 1: How to consider the influence of tooth profile modification on lubrication characteristics.
    Response: Thank you very much for your careful work. Your suggestions are very helpful for our research. The purpose of this research is to obtain the actual effect of the microstructure parameters of on the mixed lubrication performance of the tooth surface. In the manuscript, the lubrication characteristics of the standard gear along the meshing line are analyzed. Regarding the influence of gear modification on the lubrication characteristics, firstly, according to the gear meshing geometric relationship, the variation of curvature radius, entrainment speed and load at the meshing point after the tooth profile modification can be calculated; after that, the relevant meshing parameters are input to the three-dimensional mixed EHL Model to obtain lubrication parameters such as film thickness and film pressure along the meshing line; finally, contact characteristic parameters such as friction coefficient and stress distribution can also be calculated. We will carry out research work in this area later.

    Comment 2: How does the research conclusion of this paper guide the optimization design of gear?
    Response: Thank you very much for your comments. In this manuscript, the meshing parameters of the point where the contact stress is larger during the actual meshing process of the gear are used to simulate and calculate. The actual effect of the microstructure parameters on the mixed lubrication performance of the tooth surface can be obtained by calculation, and the relevant results can be used to guide the texture processing of the gear surface under actual working conditions. This will effectively improve processing economy and save time.

    Comment 3: It is suggested to add relevant references, and the following related literatures are for reference.
    1)Research on lubrication characteristics of asymmetric helical gear based on CFD method[J]. Lubrication Science, 2020, https://doi.org/10.1002/ls.1504.
    2) Analytical Investigation on Load Sharing Characteristics of Herringbone Planetary Gear Train with Flexible Support and Floating Sun Gear [J]. Mechanism and Machine Theory, 2020, 144 (2) : 1-27.
    3) Analytical investigation on load-sharing characteristics for multi-power face gear split flow system [J]. Journal of Mechanical Engineering Science, 2020, 234 (2) : 676-692.
    Response: Thank you very much for your suggestions. We have added relevant references to the revised manuscript.

    Once again, we acknowledge your comments and constructive suggestions very much, which are valuable in improving the quality of our manuscript. We hope that our revision is found to be satisfactory and complete. If you have any question about this paper, please contact us without hesitate.

    Best regards!

    Sincerely,

    Dr. Zhengminqing Li
    Nanjing University of Aeronautics and Astronautics
    29 Yudao St., Nanjing 210016, Jiangsu, China
    lzmq_cmee@nuaa.edu.cn (E-mail)



    Cite this author response
  • pre-publication peer review (ROUND 4)
    Decision Letter
    2021/01/19

    19-Jan-2021

    Dear Prof. Li:

    Manuscript ID ilt-11-2020-0423.R3 entitled "Effect of Micro-Textures on Lubrication Characteristics of Spur Gears under 3D Line-Contact EHL Model" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    The reviewer(s) have recommended revisions to the submitted manuscript, before it can be considered for publication. Therefore, I invite you to respond to the reviewer(s)' comments and revise your manuscript.

    To revise your manuscript, log into https://mc.manuscriptcentral.com/ilt and enter your Author Centre, where you will find your manuscript title listed under "Manuscripts with Decisions." Under "Actions," click on "Create a Revision." Your manuscript number has been appended to denote a revision.

    You will be unable to make your revisions on the originally submitted version of the manuscript. Instead, revise your manuscript using a word processing program and save it on your computer. Please also highlight the changes to your manuscript within the document by using the track changes mode in MS Word or by using bold or coloured text.

    Once the revised manuscript is prepared, you can upload it and submit it through your Author Centre. The deadline for uploading a revised manuscript is 18-Feb-2021 from receiving this email. If it is not possible for you to resubmit your revision within this timeframe, we may have to consider your paper as a new submission.

    When submitting your revised manuscript, you will be able to respond to the comments made by the reviewer(s) in the space provided. You can use this space to document any changes you make to the original manuscript. In order to expedite the processing of the revised manuscript, please be as specific as possible in your response to the reviewer(s).

    IMPORTANT: Your original files are available to you when you upload your revised manuscript. Please delete any redundant files before completing the submission.

    Please note that Emerald requires you to clear permission to re-use any material not created by you. If there are permissions outstanding, please send these to Emerald as soon as possible. Emerald is unable to publish your paper with permissions outstanding.

    To help support you on your publishing journey we have partnered with Editage, a leading global science communication platform, to offer expert editorial support including language editing and translation.
    If your article has been rejected or revisions have been requested, you may benefit from Editage’s services. For a full list of services, visit: authorservices.emeraldpublishing.com/
    Please note that there is no obligation to use Editage and using this service does not guarantee publication.

    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Dr. T V V L N Rao
    Guest Editor, Industrial Lubrication and Tribology
    tvvlnrao@gmail.com

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    Agree to accept

    Reviewer: 2

    Comments to the Author
    Accept,some revision suggestions below:
    1.How to consider the influence of tooth profile modification on lubrication characteristics
    2.How does the research conclusion of this paper guide the optimization design of gear?
    3. It is suggested to add relevant references, and the following related literatures are for reference
    1)Research on lubrication characteristics of asymmetric helical gear based on CFD method[J]. Lubrication Science, 2020, https://doi.org/10.1002/ls.1504.
    2) Analytical Investigation on Load Sharing Characteristics of Herringbone Planetary Gear Train with Flexible Support and Floating Sun Gear [J]. Mechanism and Machine Theory, 2020, 144 (2) : 1-27.
    3) Analytical investigation on load-sharing characteristics for multi-power face gear split flow system [J]. Journal of Mechanical Engineering Science, 2020, 234 (2) : 676-692.
    Reviewer: 1

    Recommendation: Accept

    Comments:
    Agree to accept

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: YES

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: YES

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: YES

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: YES

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: YES

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: YES

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Minor Revision

    Comments:
    Accept,some revision suggestions below:
    1.How to consider the influence of tooth profile modification on lubrication characteristics
    2.How does the research conclusion of this paper guide the optimization design of gear?
    3. It is suggested to add relevant references, and the following related literatures are for reference
    1)Research on lubrication characteristics of asymmetric helical gear based on CFD method[J]. Lubrication Science, 2020, https://doi.org/10.1002/ls.1504.
    2) Analytical Investigation on Load Sharing Characteristics of Herringbone Planetary Gear Train with Flexible Support and Floating Sun Gear [J]. Mechanism and Machine Theory, 2020, 144 (2) : 1-27.
    3) Analytical investigation on load-sharing characteristics for multi-power face gear split flow system [J]. Journal of Mechanical Engineering Science, 2020, 234 (2) : 676-692.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: YES

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: YES

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: YES

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: YES

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: YES

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: YES

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2021/01/19

    Accept,some revision suggestions below:
    1.How to consider the influence of tooth profile modification on lubrication characteristics
    2.How does the research conclusion of this paper guide the optimization design of gear?
    3. It is suggested to add relevant references, and the following related literatures are for reference
    1)Research on lubrication characteristics of asymmetric helical gear based on CFD method[J]. Lubrication Science, 2020, https://doi.org/10.1002/ls.1504.
    2) Analytical Investigation on Load Sharing Characteristics of Herringbone Planetary Gear Train with Flexible Support and Floating Sun Gear [J]. Mechanism and Machine Theory, 2020, 144 (2) : 1-27.
    3) Analytical investigation on load-sharing characteristics for multi-power face gear split flow system [J]. Journal of Mechanical Engineering Science, 2020, 234 (2) : 676-692.

    Reviewed by
    Cite this review
    Reviewer report
    2021/01/18

    Agree to accept

    Reviewed by
    Cite this review
    Author Response
    2021/01/14

    14 January 2020
    Dr. T V V L N Rao
    Receiving Editor
    Industrial Lubrication and Tribology

    Dear Dr. T V V L N Rao:

    Thank you for your letter and for the comments concerning our manuscript. Those comments are all valuable and very helpful for revising and improving our paper.We have studied comments carefully and have made correction. Revised portion are marked in red in the paper.
    We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the corrections will meet with approval.

    Best regards!

    Sincerely,

    Dr. Zhengminqing Li
    Nanjing University of Aeronautics and Astronautics
    29 Yudao St., Nanjing 210016, Jiangsu, China
    lzmq_cmee@nuaa.edu.cn (E-mail)



    Cite this author response
  • pre-publication peer review (ROUND 3)
    Decision Letter
    2021/01/11

    11-Jan-2021

    Dear Prof. Li:

    Manuscript ID ilt-11-2020-0423.R2 entitled "Effect of Micro-Textures on Lubrication Characteristics of Spur Gears under 3D Line-Contact EHL Model" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    The reviewer(s) have recommended major revisions to the submitted manuscript, before it can be considered for publication. Therefore, I invite you to respond to the reviewer(s)' comments and revise your manuscript.

    To revise your manuscript, log into https://mc.manuscriptcentral.com/ilt and enter your Author Centre, where you will find your manuscript title listed under "Manuscripts with Decisions." Under "Actions," click on "Create a Revision." Your manuscript number has been appended to denote a revision.

    You will be unable to make your revisions on the originally submitted version of the manuscript. Instead, revise your manuscript using a word processing program and save it on your computer. Please also highlight the changes to your manuscript within the document by using the track changes mode in MS Word or by using bold or coloured text.

    Once the revised manuscript is prepared, you can upload it and submit it through your Author Centre. The deadline for uploading a revised manuscript is 11-Apr-2021 from receiving this email. If it is not possible for you to resubmit your revision within this timeframe, we may have to consider your paper as a new submission.

    When submitting your revised manuscript, you will be able to respond to the comments made by the reviewer(s) in the space provided. You can use this space to document any changes you make to the original manuscript. In order to expedite the processing of the revised manuscript, please be as specific as possible in your response to the reviewer(s).

    IMPORTANT: Your original files are available to you when you upload your revised manuscript. Please delete any redundant files before completing the submission.

    Please note that Emerald requires you to clear permission to re-use any material not created by you. If there are permissions outstanding, please send these to Emerald as soon as possible. Emerald is unable to publish your paper with permissions outstanding.

    To help support you on your publishing journey we have partnered with Editage, a leading global science communication platform, to offer expert editorial support including language editing and translation.
    If your article has been rejected or revisions have been requested, you may benefit from Editage’s services. For a full list of services, visit: authorservices.emeraldpublishing.com/
    Please note that there is no obligation to use Editage and using this service does not guarantee publication.

    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Dr. T V V L N Rao
    Guest Editor, Industrial Lubrication and Tribology
    tvvlnrao@gmail.com

    Comments Editors-in-Chief:

    The manuscript contains unfortunately 15 Figures. Please be advised that in the authors' guidelines, there are well defined limits for the maximum number of words (including main text and figures/tables). Therefore, I need to kindly ask you to reduce the number of figures in order to match with the respective guidelines. This can be certainly partially done by grouping different figures together and work with a), b) and so on.

    In addition, the list of reference are rather old and not very up-to-date. There are just a few references from the last 3 years. Considering that a number of review articles have been recently published on surface texturing and tribology as well as other important research contributions, the authors are advised to screen the literature and to update the list of references.

    Thank you very much.

    A. Rosenkranz and C. Gachot

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    Thank you for your revision. I think the current edition can be published in this journal.

    Reviewer: 2

    Comments to the Author
    The manuscripts is revised properly.
    Reviewer: 1

    Recommendation: Accept

    Comments:
    Thank you for your revision. I think the current edition can be published in this journal.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: This paper studies the relationship between the laser surface texturing and the lubrication characteristics of gears, and draws many valuable conclusions. It can provide a reference for the tooth surface texturing, and has the rationality of publication.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: In the revised version, the literatures on gear lubrication and EHL of rough surface are added. The references in the current version have a comprehensive introduction to the research field.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: The calculation process of this paper is mainly based on the EHL theory. The calculation process is detailed and the results are correct. A friction test is designed to support the calculation process. The conclusions of the paper can be clearly obtained through calculation, which prove that the method adopted in this paper is appropriate.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: In this paper, the calculation results are analyzed in detail, and many conclusions are drawn. The revised version adds the consideration of gear meshing characteristics in the calculation, which reflects the theme of this paper.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: The calculation of the current version is to provide a theoretical basis for future engineering applications. It is suggested that the author continue to improve the research results and carry out experimental research on gear tooth texturing method to prove the validity of the conclusions.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: The readability of the paper is very good, so that readers can clearly understand what the authors want to express. The sentence structure, jargon use and acronyms in the paper are all right.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?: The calculation process of this paper is detailed, and the calculation results are repeatable.

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: No, I would not like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Accept

    Comments:
    The manuscripts is revised properly.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: YES

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: YES

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: YES

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: YES

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: YES

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: YES

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2021/01/11

    The manuscripts is revised properly.

    Reviewed by
    Cite this review
    Reviewer report
    2021/01/11

    Thank you for your revision. I think the current edition can be published in this journal.

    Reviewed by
    Cite this review
    Author Response
    2021/01/07

    7 January 2020
    Dr. T V V L N Rao
    Receiving Editor
    Industrial Lubrication and Tribology

    Dear Dr. T V V L N Rao:

    We are truly grateful to your efforts and the reviewers’ critical comments and thoughtful suggestions. Based on these comments and suggestions, we have made careful modifications on the manuscript. We hope this revision will meet the standard of Industrial Lubrication and Tribology. Here below is one-by-one response to your comments.

    Best regards!

    Sincerely,

    Dr. Zhengminqing Li
    Nanjing University of Aeronautics and Astronautics
    29 Yudao St., Nanjing 210016, Jiangsu, China
    lzmq_cmee@nuaa.edu.cn (E-mail)

    Author's Detailed Responses
    Comment 1: revision of the abstract as per format.
    Response: We have revised the abstract format in the revised manuscript as required by the journal.

    We have checked the manuscript and revised it according to the comments. We submit here the revised manuscript as well as a list of changes. Thank you and all the reviewers for the kind advice.



    Cite this author response
  • pre-publication peer review (ROUND 2)
    Decision Letter
    2021/01/04

    04-Jan-2021

    Dear Dr. ZHAO:

    Manuscript ID ilt-11-2020-0423.R1 entitled "Effect of Micro-Textures on Lubrication Characteristics of Spur Gears under 3D Line-Contact EHL Model" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    The reviewer(s) have recommended revisions to the submitted manuscript, before it can be considered for publication. Therefore, I invite you to respond to the reviewer(s)' comments and revise your manuscript.

    The manuscript is recommended for publication followed by revision of the abstract as per format.

    To revise your manuscript, log into https://mc.manuscriptcentral.com/ilt and enter your Author Centre, where you will find your manuscript title listed under "Manuscripts with Decisions." Under "Actions," click on "Create a Revision." Your manuscript number has been appended to denote a revision.

    You will be unable to make your revisions on the originally submitted version of the manuscript. Instead, revise your manuscript using a word processing program and save it on your computer. Please also highlight the changes to your manuscript within the document by using the track changes mode in MS Word or by using bold or coloured text.

    Once the revised manuscript is prepared, you can upload it and submit it through your Author Centre. The deadline for uploading a revised manuscript is 03-Feb-2021 from receiving this email. If it is not possible for you to resubmit your revision within this timeframe, we may have to consider your paper as a new submission.

    When submitting your revised manuscript, you will be able to respond to the comments made by the reviewer(s) in the space provided. You can use this space to document any changes you make to the original manuscript. In order to expedite the processing of the revised manuscript, please be as specific as possible in your response to the reviewer(s).

    IMPORTANT: Your original files are available to you when you upload your revised manuscript. Please delete any redundant files before completing the submission.

    Please note that Emerald requires you to clear permission to re-use any material not created by you. If there are permissions outstanding, please send these to Emerald as soon as possible. Emerald is unable to publish your paper with permissions outstanding.

    To help support you on your publishing journey we have partnered with Editage, a leading global science communication platform, to offer expert editorial support including language editing and translation.
    If your article has been rejected or revisions have been requested, you may benefit from Editage’s services. For a full list of services, visit: authorservices.emeraldpublishing.com/
    Please note that there is no obligation to use Editage and using this service does not guarantee publication.

    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Dr. T V V L N Rao
    Guest Editor, Industrial Lubrication and Tribology
    tvvlnrao@gmail.com

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    I am satisfied with the revision of the manuscript.

    Reviewer: 2

    Comments to the Author
    Thank you for answering my questions. I think the current edition can be published in this journal.
    Reviewer: 1

    Recommendation: Accept

    Comments:
    I am satisfied with the revision of the manuscript.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: YES

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: YES

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: YES

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: YES

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: YES

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: YES

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Accept

    Comments:
    Thank you for answering my questions. I think the current edition can be published in this journal.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: This paper studies the relationship between the laser surface texturing and the lubrication characteristics of gears, and draws many valuable conclusions. It can provide a reference for the tooth surface texturing, and has the rationality of publication.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: In the revised version, the literatures on gear lubrication and EHL of rough surface are added. The references in the current version have a comprehensive introduction to the research field.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: The calculation process of this paper is mainly based on the EHL theory. The calculation process is detailed and the results are correct. A friction test is designed to support the calculation process. The conclusions of the paper can be clearly obtained through calculation, which prove that the method adopted in this paper is appropriate.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: In this paper, the calculation results are analyzed in detail, and many conclusions are drawn. The revised version adds the consideration of gear meshing characteristics in the calculation, which reflects the theme of this paper.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: The calculation of the current version is to provide a theoretical basis for future engineering applications. It is suggested that the author continue to improve the research results and carry out experimental research on gear tooth texturing method to prove the validity of the conclusions.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: The readability of the paper is very good, so that readers can clearly understand what the authors want to express. The sentence structure, jargon use and acronyms in the paper are all right.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?: The calculation process of this paper is detailed, and the calculation results are repeatable.

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: No, I would not like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2021/01/04

    Thank you for answering my questions. I think the current edition can be published in this journal.

    Reviewed by
    Cite this review
    Reviewer report
    2021/01/02

    I am satisfied with the revision of the manuscript.

    Reviewed by
    Cite this review
    Author Response
    2020/12/31

    Responses to the reviewer’s comments:
    Reviewer #1:

    Comment 1: In the introduction, the source of the research direction of the paper is less introduced, and more literature review on EHL of rough surface should be added.
    Response: Thank you very much for your suggestions. Scholars have made a series of progress in the EHL research of rough surfaces. We have added Ref [2-10] on EHL analysis of rough surfaces in the "INTRODUCTION" of revised manuscript.

    Comment 2: Gear system is a typical high pair mechanism. Will the laser surface texturing affect the fatigue life of gears? Is there any successful application in gears?
    Response: Thank you very much to point out this issue. Scholars have initially carried out an investigation on the application of laser texture in gears. GRECO et al. [15] carried out a micro-pit texture friction test, and pointed out that the design of micro-pit texture on the gear surface can improve the anti-adhesive ability of the gear system. HAN et al. [16] using laser engraving technology, a striped groove texture array was prepared at the tooth root of the gear, and the bending fatigue test of the gear was carried out. The test results showed that the texture array on the surface of the gear can improve the bending of the gear compared with conventional gears. The bending fatigue life of the gear is enhanced by about 1.5 times. These references have been added to the revised manuscript.

    Comment 3: What does the picture on the right of Fig.1 mean? This diagram should be described more clearly.
    Response: Thank you very much for your comments. The right side of Fig. 1 is a simplified model of gear meshing. In the theory of EHL, the meshing of the gear pair can approximately simplify the relative rolling motion of two equivalent cylinders with radii R1 and R2 respectively. The comprehensive radius of curvature of the meshing point is the equivalent radius of curvature of the two contacting cylinders. We have added relevant content to the revised manuscript.

    Comment 4: How to eliminate the influence of molten metal on the surface topography after laser texturing?
    Response: In order to eliminate the influence of the laser molten metal, the test piece needs to be polished again after the laser processing is completed. First, the metallographic sandpaper is used to finely polish the test piece, and then acetone is used to ultrasonically clean the test piece to remove residual impurities during the polishing process. We have added relevant content to the revised manuscript.

    Comment 5: Fig. 6, 7 and 8 are quoted incorrectly.
    Response: Thank you very much to point out this issue. It is our fault and we have corrected related errors in the revised manuscript.

    Comment 6: What is the lubrication state of friction test? Is the texture distributed on the whole surface of specimen? How long did the experiment last? Is there a running in stage before the experiment? How does friction test embody the difference of A-F meshing points?
    Response: Thank you very much for your comments. In the friction test, the test piece is in a state of rich oil lubrication. More than 1/2 of the volume of the specimen is immersed in the lubricating oil. The texture is distributed on the entire surface of the specimen. In each test, the test lasts for about 5 minutes and enters the stable operation stage after about 30s. The test data are calculated based on the average value of the measured data during stable operation during the measurement time. The test at each speed is directly loaded from a speed of 0 to a set speed, and the test data will remain stable after about 30s. We have added relevant content to the revised manuscript. The friction test has not yet embodied the difference of A-F meshing points. We will continue to carry out related research in the follow-up work.

    Comment 7: How to introduce texture surface topography into EHL calculation in this paper? The calculation process should be described in detail.
    Response: Thank you very much for your careful work. During the EHL calculation, Firstly, the topography of the two contact surfaces is measured by a three-dimensional topography instrument, and the data is dimensionlessly processed to obtain data sets δ1 and δ2. Then, topography data will be input into the oil film thickness equation, and the working condition parameters (such as load P and entrainment velocity U) will be input into the numerical calculation program. Finally, After an iterative calculation, parameters such as oil film thickness and oil film pressure are obtained. We have added relevant content to the revised manuscript.

    Comment 8: Fig. 10 shows the calculation results of A# array, which is compared with smooth surface in the analysis. Can the results of smooth surface be given? The label of Fig.10 (c) is wrong and the marking line in Fig.10 (c) is not clear.
    Response: Thank you very much for your comments. We have added the film pressure, film thickness, and temperature rise of the smooth surface in Fig. 10. And the error in Fig.10(c) has been corrected.

    Comment 9: In Section 3.3, is laser texturing performed on the actual tooth surface? If so, the specific texture method should be given.
    Response: Thank you very much for your comments. In this manuscript, laser textured specimens are used for principle friction verification tests. Due to the time-varying coefficient of friction during gear meshing, laser texturing and testing have not been performed on real gears.

    Comment 10: How is the calculation in Section 3.3 combined with the actual meshing process of gears?
    Response: Thank you very much for your careful work. In section 3.3, the meshing parameters of the point where the contact stress is larger during the actual meshing process of the gear are used to simulate and calculate. The purpose of section 3.3 is to obtain the actual effect of the microstructure parameters on the mixed lubrication performance of the tooth surface, which is used to guide the texture processing of the gear surface under actual working conditions. This will effectively improve processing economy and save time.

    Comment 11: Can the conclusions about tooth surface texturing be verified by experiments?
    Response: Thank you very much for your suggestions. We very much agree with your suggestion. The conclusion of experimental verification of tooth surface texture is very important for verifying the results of numerical simulation and guiding the micro-texture processing on the actual gear surface. At present, our research group is also carrying out research in this area, and related research work will be our key research direction in the future.

    Reviewer #2:

    Comment 1: Many grammatical errors should be corrected carefully. Such as: line 79 on page 3 “is”, line 213 on page 11”speed”, line 138 on page 7”is”, line 150 on page 7”is adopt”, line 279 on page 14”has”, line 349 on page 20”peak”, line 354 and line 354 have extra A.
    Response: Thank you very much for your careful work. It is our fault and we have corrected related grammatical errors in the revised manuscript.

    Comment 2: Some formatting errors: The closing parenthesis after line 176 E on page 9 lacks a corresponding opening parenthesis.
    Response: Thank you very much to point out this issue. The right half bracket of line 176 is redundant. This is our negligence and we have deleted it from the manuscript.

    Comment 3: There are errors in the picture: There are two Picture B on Page 15, Fig10. It is suggested to modify one into C.
    Response: Thank you very much for your careful work. It is our fault and the error in Fig.10 (c) has been corrected in the revised manuscript.

    Comment 4: The picture does not correspond to the description of the article; Fig.6 on line 254 of page 13 (Fig.6 is a comparison of non-textured surface and textured surface) contains the same error on line 262 of the same page; Line 270 on page 14 (Fig.7 is the relationship between friction coefficient and velocity); Line 345 on page 19, Fig.6.
    Response: Thank you very much for your comments. The error regarding the image tag has been corrected in the revised manuscript.

    Comment 5: There are some spelling errors, such as X-direction on line 367 on page 21.
    Response: Thank you very much for your comments. The spelling errors on line 367 on page 21 are corrected in the revised manuscript.

    Comment 6: On page 14, the paper described the variation of average film thickness and friction coefficient of three micro-pit arrays at different engagement points. Please give the data of average film thickness in Fig. 9.
    Response: Thank you very much for your valuable comment. It is our fault and we have added the average film thickness in Fig. 9.

    Comment 7: Three groups of different micro-texture arrangements are adopted in this paper, and their lubrication characteristics are studied respectively; A: Lx=Ly=0.3mm B: Lx=0.4mm, Ly=0.2mm C: Lx=Ly=0.3mm Why should the spacing of the micro-texture arrangements be chosen in this way, please explain.
    Response: Thank you very much for your comments. The spacing of the micro-texture structure is selected after considering the factors of the Hertz contact radius and laser power. In addition, the micro-texture area ratio is similar in the three arrangements of such spacing, which is convenient for comparison.



    Cite this author response
  • pre-publication peer review (ROUND 1)
    Decision Letter
    2020/12/21

    21-Dec-2020

    Dear Dr. ZHAO:

    Manuscript ID ilt-11-2020-0423 entitled "Effect of Micro-Textures on Lubrication Characteristics of Spur Gears under 3D Line-Contact EHL Model" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    The reviewer(s) have recommended major revisions to the submitted manuscript, before it can be considered for publication. Therefore, I invite you to respond to the reviewer(s)' comments and revise your manuscript.

    To revise your manuscript, log into https://mc.manuscriptcentral.com/ilt and enter your Author Centre, where you will find your manuscript title listed under "Manuscripts with Decisions." Under "Actions," click on "Create a Revision." Your manuscript number has been appended to denote a revision.

    You will be unable to make your revisions on the originally submitted version of the manuscript. Instead, revise your manuscript using a word processing program and save it on your computer. Please also highlight the changes to your manuscript within the document by using the track changes mode in MS Word or by using bold or coloured text.

    Once the revised manuscript is prepared, you can upload it and submit it through your Author Centre. The deadline for uploading a revised manuscript is 22-Mar-2021 from receiving this email. If it is not possible for you to resubmit your revision within this timeframe, we may have to consider your paper as a new submission.

    When submitting your revised manuscript, you will be able to respond to the comments made by the reviewer(s) in the space provided. You can use this space to document any changes you make to the original manuscript. In order to expedite the processing of the revised manuscript, please be as specific as possible in your response to the reviewer(s).

    IMPORTANT: Your original files are available to you when you upload your revised manuscript. Please delete any redundant files before completing the submission.

    Please note that Emerald requires you to clear permission to re-use any material not created by you. If there are permissions outstanding, please send these to Emerald as soon as possible. Emerald is unable to publish your paper with permissions outstanding.

    To help support you on your publishing journey we have partnered with Editage, a leading global science communication platform, to offer expert editorial support including language editing and translation.
    If your article has been rejected or revisions have been requested, you may benefit from Editage’s services. For a full list of services, visit: authorservices.emeraldpublishing.com/
    Please note that there is no obligation to use Editage and using this service does not guarantee publication.

    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Dr. T V V L N Rao
    Guest Editor, Industrial Lubrication and Tribology
    tvvlnrao@gmail.com

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    In this paper, a method combining numerical simulation and experimentation is employed to evaluate the performance of Laser surface texturing (LST) in the field of gear lubrication. The calculation process is detailed and many valuable conclusions are obtained, which will provide theoretical basis for tooth surface texturing. However, gear meshing should not only be used as a background to study the effect of surface texturing on lubrication interface. The research process of this paper should be more closely combined with the gear meshing process. The following questions need to be answered by the author:
    1. In the introduction, the source of the research direction of the paper is less introduced, and more literature review on EHL of rough surface should be added.
    2. Gear system is a typical high pair mechanism. Will the laser surface texturing affect the fatigue life of gears? Is there any successful application in gears?
    3. What does the picture on the right of Fig.1 mean? This diagram should be described more clearly.
    4. How to eliminate the influence of molten metal on the surface topography after laser texturing?
    5. Fig. 6, 7 and 8 are quoted incorrectly.
    6. What is the lubrication state of friction test? Is the texture distributed on the whole surface of specimen? How long did the experiment last? Is there a running in stage before the experiment? How does friction test embody the difference of A-F meshing points?
    7. How to introduce texture surface topography into EHL calculation in this paper? The calculation process should be described in detail.
    8. Fig. 10 shows the calculation results of A# array, which is compared with smooth surface in the analysis. Can the results of smooth surface be given? The label of Fig.10 (c) is wrong and the marking line in Fig.10 (c) is not clear.
    9. In Section 3.3, is laser texturing performed on the actual tooth surface? If so, the specific texture method should be given.
    10.How is the calculation in Section 3.3 combined with the actual meshing process of gears?
    11.Can the conclusions about tooth surface texturing be verified by experiments?

    Reviewer: 2

    Comments to the Author
    This paper is very readable and of great research value. The work mainly includes three parts: studied on lubrication characteristics of involute gear pair with smooth surface; mixed lubrication analysis of involute spur gear pair with micro-textured surface; finally analyzed the Effect of micro-texture parameters on the mixed lubrication performance of tooth surface. The whole article is written perfect, but there are still some shortcomings. My concerns are as follows:
    1.Many grammatical errors should be corrected carefully. Such as: line 79 on page 3 “is”, line 213 on page 11”speed”, line 138 on page 7”is”, line 150 on page 7”is adopt”, line 279 on page 14”has”, line 349 on page 20”peak”, line 354 and line 354 have extra A.
    2.Some formatting errors: The closing parenthesis after line 176 E on page 9 lacks a corresponding opening parenthesis.
    3.There are errors in the picture: There are two Picture B on Page 15, Fig10. It is suggested to modify one into C.
    4.The picture does not correspond to the description of the article; Fig.6 on line 254 of page 13 (Fig.6 is a comparison of non-textured surface and textured surface) contains the same error on line 262 of the same page; Line 270 on page 14 (Fig.7 is the relationship between friction coefficient and velocity); Line 345 on page 19, Fig.6.
    5.There are some spelling errors, such as X-direction on line 367 on page 21.
    6.On page 14, the paper described the variation of average film thickness and friction coefficient of three micro-pit arrays at different engagement points. Please give the data of average film thickness in Fig. 9.
    7.Three groups of different micro-texture arrangements are adopted in this paper, and their lubrication characteristics are studied respectively; A: Lx=Ly=0.3mm B: Lx=0.4mm, Ly=0.2mm C: Lx=Ly=0.3mm Why should the spacing of the micro-texture arrangements be chosen in this way, please explain.
    Reviewer: 1

    Recommendation: Major Revision

    Comments:
    In this paper, a method combining numerical simulation and experimentation is employed to evaluate the performance of Laser surface texturing (LST) in the field of gear lubrication. The calculation process is detailed and many valuable conclusions are obtained, which will provide theoretical basis for tooth surface texturing. However, gear meshing should not only be used as a background to study the effect of surface texturing on lubrication interface. The research process of this paper should be more closely combined with the gear meshing process. The following questions need to be answered by the author:
    1. In the introduction, the source of the research direction of the paper is less introduced, and more literature review on EHL of rough surface should be added.
    2. Gear system is a typical high pair mechanism. Will the laser surface texturing affect the fatigue life of gears? Is there any successful application in gears?
    3. What does the picture on the right of Fig.1 mean? This diagram should be described more clearly.
    4. How to eliminate the influence of molten metal on the surface topography after laser texturing?
    5. Fig. 6, 7 and 8 are quoted incorrectly.
    6. What is the lubrication state of friction test? Is the texture distributed on the whole surface of specimen? How long did the experiment last? Is there a running in stage before the experiment? How does friction test embody the difference of A-F meshing points?
    7. How to introduce texture surface topography into EHL calculation in this paper? The calculation process should be described in detail.
    8. Fig. 10 shows the calculation results of A# array, which is compared with smooth surface in the analysis. Can the results of smooth surface be given? The label of Fig.10 (c) is wrong and the marking line in Fig.10 (c) is not clear.
    9. In Section 3.3, is laser texturing performed on the actual tooth surface? If so, the specific texture method should be given.
    10.How is the calculation in Section 3.3 combined with the actual meshing process of gears?
    11.Can the conclusions about tooth surface texturing be verified by experiments?

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: This paper studies the relationship between the laser surface texturing and the lubrication characteristics of gears, and draws many valuable conclusions. It can provide a reference for the tooth surface texturing, and has the rationality of publication.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: In the introduction part of this paper, the research work of surface texturing technology is introduced in detail, but the research progress of gear lubrication is not introduced, so I think the authors do not fully understand the literature in related fields. The paper should add the literature about lubrication research of gear system and EHL of rough surface.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: The calculation process of this paper is mainly based on the EHL theory. The calculation process is detailed and the results are correct. A friction test is designed to support the calculation process. The conclusions of the paper can be clearly obtained through calculation, which prove that the method adopted in this paper is appropriate.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: In this paper, the calculation results are analyzed in detail, and many conclusions are drawn. However, the paper does not analyze the calculation results according to the characteristics of gear meshing, and the analysis should be more closely combined with the gear meshing process.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Whether the conclusions can be applied to engineering practice is not specified, and the future work is not prospected after the conclusions are drawn. In fact, a lot of research work can be done in the future. It is suggested that the method and experimental study of tooth surface texturing should be added in the future work.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: The readability of the paper is very good, so that readers can clearly understand what the authors want to express. The sentence structure, jargon use and acronyms in the paper are all right.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: No, I would not like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Minor Revision

    Comments:
    This paper is very readable and of great research value. The work mainly includes three parts: studied on lubrication characteristics of involute gear pair with smooth surface; mixed lubrication analysis of involute spur gear pair with micro-textured surface; finally analyzed the Effect of micro-texture parameters on the mixed lubrication performance of tooth surface. The whole article is written perfect, but there are still some shortcomings. My concerns are as follows:
    1.Many grammatical errors should be corrected carefully. Such as: line 79 on page 3 “is”, line 213 on page 11”speed”, line 138 on page 7”is”, line 150 on page 7”is adopt”, line 279 on page 14”has”, line 349 on page 20”peak”, line 354 and line 354 have extra A.
    2.Some formatting errors: The closing parenthesis after line 176 E on page 9 lacks a corresponding opening parenthesis.
    3.There are errors in the picture: There are two Picture B on Page 15, Fig10. It is suggested to modify one into C.
    4.The picture does not correspond to the description of the article; Fig.6 on line 254 of page 13 (Fig.6 is a comparison of non-textured surface and textured surface) contains the same error on line 262 of the same page; Line 270 on page 14 (Fig.7 is the relationship between friction coefficient and velocity); Line 345 on page 19, Fig.6.
    5.There are some spelling errors, such as X-direction on line 367 on page 21.
    6.On page 14, the paper described the variation of average film thickness and friction coefficient of three micro-pit arrays at different engagement points. Please give the data of average film thickness in Fig. 9.
    7.Three groups of different micro-texture arrangements are adopted in this paper, and their lubrication characteristics are studied respectively; A: Lx=Ly=0.3mm B: Lx=0.4mm, Ly=0.2mm C: Lx=Ly=0.3mm Why should the spacing of the micro-texture arrangements be chosen in this way, please explain.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: Yes.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: Yes.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: Yes.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: Yes.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Uncertain.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: Yes.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2020/12/21

    This paper is very readable and of great research value. The work mainly includes three parts: studied on lubrication characteristics of involute gear pair with smooth surface; mixed lubrication analysis of involute spur gear pair with micro-textured surface; finally analyzed the Effect of micro-texture parameters on the mixed lubrication performance of tooth surface. The whole article is written perfect, but there are still some shortcomings. My concerns are as follows:
    1.Many grammatical errors should be corrected carefully. Such as: line 79 on page 3 “is”, line 213 on page 11”speed”, line 138 on page 7”is”, line 150 on page 7”is adopt”, line 279 on page 14”has”, line 349 on page 20”peak”, line 354 and line 354 have extra A.
    2.Some formatting errors: The closing parenthesis after line 176 E on page 9 lacks a corresponding opening parenthesis.
    3.There are errors in the picture: There are two Picture B on Page 15, Fig10. It is suggested to modify one into C.
    4.The picture does not correspond to the description of the article; Fig.6 on line 254 of page 13 (Fig.6 is a comparison of non-textured surface and textured surface) contains the same error on line 262 of the same page; Line 270 on page 14 (Fig.7 is the relationship between friction coefficient and velocity); Line 345 on page 19, Fig.6.
    5.There are some spelling errors, such as X-direction on line 367 on page 21.
    6.On page 14, the paper described the variation of average film thickness and friction coefficient of three micro-pit arrays at different engagement points. Please give the data of average film thickness in Fig. 9.
    7.Three groups of different micro-texture arrangements are adopted in this paper, and their lubrication characteristics are studied respectively; A: Lx=Ly=0.3mm B: Lx=0.4mm, Ly=0.2mm C: Lx=Ly=0.3mm Why should the spacing of the micro-texture arrangements be chosen in this way, please explain.

    Reviewed by
    Cite this review
    Reviewer report
    2020/11/30

    In this paper, a method combining numerical simulation and experimentation is employed to evaluate the performance of Laser surface texturing (LST) in the field of gear lubrication. The calculation process is detailed and many valuable conclusions are obtained, which will provide theoretical basis for tooth surface texturing. However, gear meshing should not only be used as a background to study the effect of surface texturing on lubrication interface. The research process of this paper should be more closely combined with the gear meshing process. The following questions need to be answered by the author:
    1. In the introduction, the source of the research direction of the paper is less introduced, and more literature review on EHL of rough surface should be added.
    2. Gear system is a typical high pair mechanism. Will the laser surface texturing affect the fatigue life of gears? Is there any successful application in gears?
    3. What does the picture on the right of Fig.1 mean? This diagram should be described more clearly.
    4. How to eliminate the influence of molten metal on the surface topography after laser texturing?
    5. Fig. 6, 7 and 8 are quoted incorrectly.
    6. What is the lubrication state of friction test? Is the texture distributed on the whole surface of specimen? How long did the experiment last? Is there a running in stage before the experiment? How does friction test embody the difference of A-F meshing points?
    7. How to introduce texture surface topography into EHL calculation in this paper? The calculation process should be described in detail.
    8. Fig. 10 shows the calculation results of A# array, which is compared with smooth surface in the analysis. Can the results of smooth surface be given? The label of Fig.10 (c) is wrong and the marking line in Fig.10 (c) is not clear.
    9. In Section 3.3, is laser texturing performed on the actual tooth surface? If so, the specific texture method should be given.
    10.How is the calculation in Section 3.3 combined with the actual meshing process of gears?
    11.Can the conclusions about tooth surface texturing be verified by experiments?

    Reviewed by
    Cite this review
All peer review content displayed here is covered by a Creative Commons CC BY 4.0 license.