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research-article

Simulation of the Friction Coefficient of Paper-Based Wet Clutch With Wavy Separators

[+] Author and Article Information
Fumitaka Yoshizumi

Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
fyoshi@mosk.tytlabs.co.jp

Hirofumi Tani

Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
h-tani@mosk.tytlabs.co.jp

Shuzo Sanda

Research Center for High Efficiency Hydrogen Engine & Engine Tribology, Tokyo City University, 1-28-1 Tamazutsumi Setagaya-ku, Tokyo 158-8557, Japan
ssanda@tcu.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4040806 History: Received April 18, 2018; Revised July 04, 2018

Abstract

To simulate the change rate of the friction coefficient µ with respect to the sliding speed V, that is, the µ-V slope, a model combining macroscale and microscale phenomena is proposed. The macroscale model obtains distributions of the fluid pressure and fiber contact pressure over the whole engagement face, and the microscale model obtains the friction coefficient of each fiber contact through a detailed model for single-protuberance fiber contact. An experiment was conducted to obtain the µ-V slope by changing the wave height of separator faces, and the simulation and experimental results were compared. The combined model is advantageous for representing experimental µ-V relationships at small and large wave heights in comparison with models using only the macroscale behavior. Both experimental and simulation results showed the µ-V slope becoming more negative with increasing wave height. The simulation results revealed possible causes for the negative slope. In the wavy separator, the fluid friction that contributes to the positive slope is difficult to achieve due to the large film thickness, and the load-sharing ratio of the fiber contact tends to decrease due to wedge action of the fluid film. These phenomena shift the µ-V slope to the negative.

Copyright (c) 2018 by ASME
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