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International Journal of Automotive Technology > Volume 25(1); 2024 > Article
International Journal of Automotive Technology 2024;25(1): 119-129.
doi: https://doi.org/10.1007/s12239-024-00018-6
Influence of Groove Type on Friction Coefficient of Wet Friction Clutch Pair
Xingguang Yang 1, Heyun Bao 1, Chao Zhang 1, Wuzhong Tan 2, Rupeng Zhu 1
1National Key Laboratory of Science and Technology on Helicopter Transmission , Nanjing University of Aeronautics and Astronautics
2National Key Laboratory of Science and Technology on Helicopter Transmission , AECC Hunan Aviation Powerplant Research Institute
PDF Links Corresponding Author.  Heyun Bao  , Email. baoheyun@nuaa.edu.cn
ABSTRACT
The shape of the groove in the friction plate of a wet friction clutch has an infl uence on the dynamic friction coeffi cient of the friction pair. Some suggestions are put forward for the selection of the groove type of brake pads. This study establishes a dynamic friction coeffi cient calculation model for clutch engagement process considering the asperity and lubricant bearing capacities of the centrifugal force of the oil fi lm. The model is based on the Reynolds equation, average fl ow model, and Greenwood model. The friction coeffi cients of diff erent groove shapes were measured using the SAE#2 testing machine. The measured results were compared with theoretical calculations to verify the accuracy of the theoretical model. Under the premise of satisfying the torque transmission condition of the helicopter, the groove type of the wet clutch friction plate should be waffl ing groove or double arc groove. In this study, some suggestions are put forward for the selection of the groove type of the friction plate of the wet clutch.
Key Words: Wet clutch · Friction pair · Groove shape · Asperity · Dynamic friction coeffi cient
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