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Effect of the coefficient of friction on gear-tooth root fatigue for both dry and lubricated running polymer gears
ID Matkovič, Sebastjan (Author), ID Kalin, Mitjan (Author)

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Abstract
Polymer gears are increasingly popular for a variety of applications due to their improved performance, light weight, ease of manufacture and low cost. However, the design of polymer gears and predictions of their useful operating lifetimes require refinements based on a better understanding of all the influential parameters. For example, do dry and lubricated running polymer gears operating with the same tooth-root temperature and under the same load/torque experience different fatigue lifetimes? To investigate this question, the fatigue lifetimes of dry and oil-lubricated polymer/steel gear pairs were experimentally evaluated under three different loads (0.8, 1.0 and 1.2 Nm) and two different tooth-root temperatures (25 and 80 °C). For all the experimental conditions, the finite-element method was employed to gain a better insight into the observed differences. Finally, the decomposition of the loads acting on the gears was used to understand the effect of friction, which is different for dry and lubricated conditions, and changes direction before and after the pitch point. The lower friction in the lubricated conditions results in up to 13% less maximum stress in the tooth-root, which can have a non-linear effect on the polymer’s lifetime, resulting in a 2–5.2-times-longer fatigue life compared to dry-running gears under the same load/torque and temperature.

Language:English
Keywords:polymer gears, fatigue, friction, temperature
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2024
Number of pages:9 str.
Numbering:Vol. 194, art. 109525
PID:20.500.12556/RUL-156258 This link opens in a new window
UDC:621.8:539.4
ISSN on article:1879-2464
DOI:10.1016/j.triboint.2024.109525 This link opens in a new window
COBISS.SI-ID:188131587 This link opens in a new window
Publication date in RUL:16.05.2024
Views:85
Downloads:33
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Record is a part of a journal

Title:Tribology international
Shortened title:Tribol. int.
Publisher:Elsevier
ISSN:1879-2464
COBISS.SI-ID:62108419 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:polimerni zobniki, utrujanje, koeficient trenja, temperatura

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0231
Name:Tribologija

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