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Machines
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Dynamics and Lubrication of Gears
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Dynamics and Lubrication of Gears

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Friction and Tribology".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 1906

Special Issue Editor

Dr. Kazumasa Kawasaki

E-Mail Website
Guest Editor
Department of Technology and Engineering Management, Sanjo City University, Yamaguchi, Japan
Interests: high-precision and high-performance power transmission devices; cutting of difficult-to-cut materials; design and machining of gears
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, environmental and sustainability issues have become increasingly important. The dynamics and lubrication of gears are growing concerns for environmental and sustainability issues. The dynamics and lubrication of gears have been important under higher loads, speed, temperature and performance expectations in multiple powertrain applications, including automotive, aeronautical and marine applications. Therefore, recent advances in the dynamics and lubrication of gears will be able to be effectively utilized. This topic is effective for the improvement of the efficiency of machines.

This Special Issue aims to provide a platform for researchers to share their latest findings and applications related to gear technologies, including gear dynamics analysis, tooth contact analysis, vibration control, noise reduction, and lubrication techniques, etc. We welcome original research articles, review papers, and case studies related to these topics. Contributions with real experiments are encouraged.

Dr. Kazumasa Kawasaki
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gear dynamics
  • lubrication
  • tribological behavior
  • vibration analysis
  • tooth contact
  • gear tribology
  • friction and wear
  • gearbox dynamics

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Published Papers (2 papers)

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Research

16 pages, 1470 KB  
Article
Experimental Analysis of a Coaxial Magnetic Gear Prototype
by Stefano Lovato, Giovanni Barosco, Ludovico Ortombina, Riccardo Torchio, Piergiorgio Alotto, Maurizio Repetto and Matteo Massaro
Machines 2025, 13(8), 716; https://doi.org/10.3390/machines13080716 - 12 Aug 2025
Viewed by 503
Abstract
Magnetic gears are becoming promising devices that can replace conventional mechanical gears in several applications, where reduced maintenance, absence of lubrication and intrinsic overload protection are especially relevant. This paper focuses on the experimental analysis of a coaxial magnetic gear prototype recently developed [...] Read more.
Magnetic gears are becoming promising devices that can replace conventional mechanical gears in several applications, where reduced maintenance, absence of lubrication and intrinsic overload protection are especially relevant. This paper focuses on the experimental analysis of a coaxial magnetic gear prototype recently developed at the Department of Industrial Engineering of the University of Padova. It is found that its efficiency is high and aligned with prototypes in the literature, its stationary response confirms the velocity ratio of the corresponding mechanical planetary gear, the overload protection is aligned with numerical prediction, while the dynamic response highlights that the intrinsic compliance of the magnetic coupling prevents the use of such device in high-frequency transients. It is concluded that the proposed architecture can be effectively employed for speed reducers applications where low-frequency modulation is sufficient, which includes many industrial applications. Nevertheless, high rotational speeds are allowed. The performance characteristics, although specific for the prototype considered, experimentally highlights the key features of coaxial magnetic gear devices. The experimental performance are also compared with estimations from the literature, when available. Full article
(This article belongs to the Special Issue Dynamics and Lubrication of Gears)
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16 pages, 8791 KB  
Article
Assessing the Meshing for Windage Power Loss Simulations of an Orthogonal Face Gear
by Tiberiu-Daniel Pau, Zoltan-Iosif Korka, Dorian Nedelcu and Corneliu Hrimiuc
Machines 2025, 13(5), 341; https://doi.org/10.3390/machines13050341 - 22 Apr 2025
Cited by 1 | Viewed by 621
Abstract
In the current energy landscape, efficiency is a critical topic. Therefore, even in the case of geared transmissions, it is essential to predict and calculate power losses as accurately as possible from the design phase. There are mainly three categories of losses in [...] Read more.
In the current energy landscape, efficiency is a critical topic. Therefore, even in the case of geared transmissions, it is essential to predict and calculate power losses as accurately as possible from the design phase. There are mainly three categories of losses in a gear unit: friction—the power losses due to the contact between teeth in rotation on the one hand and the seals with the spindles on the other hand; churning—the power losses generated by the air–lubricant mixture compression around teeth roots during rotation; and windage—the power losses due to the teeth aerodynamic trail in the air–lubricant mixture. While the first two categories of losses are intensively studied in the literature, the papers focusing on windage power losses are less representative. An estimation of windage power losses can be performed by numerical simulation, and the accuracy of the results depends on the mesh density and the available computing power. The present study discusses the influence of meshing on the windage torque of an orthogonal face gear immersed in air and compares numerical results generated by SolidWorks 2025 Flow Simulation software with experimental data measured on a test rig. Full article
(This article belongs to the Special Issue Dynamics and Lubrication of Gears)
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