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International Journal of Automotive Technology > Volume 23(1); 2022 > Article
International Journal of Automotive Technology 2022;23(1): 125-134.
doi: https://doi.org/10.1007/s12239-022-0010-5
SIMULATION AND MODELING OF DYNAMIC FRICTION COEFFICIENT OF WET CLUTCH DURING ENGAGEMENT
Zhigang Zhang1,2, Ling Zou1, Hang Liu1, Yonglong Chen2, Benzhu Zhang3
1Ministry of Education
2Ningbo Shenglong Group Co. Ltd
3Chongqing Tsingshan Industrial Technology Center
PDF Links Corresponding Author.  Zhigang Zhang , Email. zhangzhigang@cqut.edu.cn
ABSTRACT
A dynamic friction coefficient model in engagement was established based on the friction transmission mechanism of a wet clutch. The effects of parameters, such as the material permeability, surface roughness, Young’s modulus, ATF viscosity, applied pressure, initial relative angular velocity, and pressure delay time, on the friction coefficient during engagement were investigated. The results indicated that material permeability has a greater influence on the time when the dynamic friction coefficient tends to be stable, choosing an appropriate permeability of friction material can effectively prevent excessive the level of jerk during the engagement and excessive engagement time. Surface roughness and applied pressure mainly affect the magnitude of the initial and midpoint friction coefficients. Appropriately increasing the surface roughness and applied pressure can increase the smoothness of the engagement of wet clutch. The ATF viscosity and initial relative angular velocity have a significant effect on the magnitude of the initial friction coefficients. Appropriately increasing the ATF viscosity and initial relative angular velocity will reduce the level of jerk at the end of the wet clutch engagement. Young’s modulus and the pressure delay time have a smaller effect on the dynamic friction coefficient than that of other parameters.
Key Words: Wet clutch, Friction coefficient, Numerical simulation, Influence parameters, Test verification
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