Effect of Visco-Elastic Property on Friction Characteristics of Paper-Based Friction Materials for Oil Immersed Clutches

[+] Author and Article Information
Tomoyuki Milayzaki, Takayuki Matsumoto

NSK Warner K. K., R&D Department, 2345 Aino, Fukuroi, Shizuoka, Japan

Takashi Yamamoto

Tokyo University of Agriculture and Technology, Tokyo, Japan

J. Tribol 120(2), 393-398 (Apr 01, 1998) (6 pages) doi:10.1115/1.2834439 History: Received November 25, 1996; Revised June 09, 1997; Online January 24, 2008


The friction characteristic of paper-based friction materials is one of the most important factors that influence the shifting performance of oil immersed clutches in automobile automatic transmissions. Visco-elasticity and porosity of the material are considered to be important properties that may control the friction characteristics of the material. In this study, the relationship between the friction characteristics and the visco-elasticity of a paper-based friction material is discussed. In order to vary the visco-elasticity while retaining the ingredients almost constant in a paper-based friction material, the formulation of the sample materials required changing the compression rate during the clutch plate bonding process and changing the volume percentage of resin. The properties of the sample materials such as porosity (pore diameter, pore diameter distribution, porosity percentage), and visco-elastic deformation in the compressive and the shearing directions, etc. were measured. In order to clarify the relationship between the friction and visco-elasticity of friction material, friction characteristics were measured. Friction characteristics of the sample materials were evaluated by a breaking-away test and continuous slip tests with a newly designed friction testing machine. From the experimental results, which showed that the lower the longitudinal modulus of the friction material, the higher the friction coefficient, it was found that friction characteristics of oil immersed paper-based friction materials are influenced by the visco-elasticity.

Copyright © 1998 by The American Society of Mechanical Engineers
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