Author(s)

H. He, K. Obubo, T. Fujii & Y. Doman

Abstract

Optimize the load-deflection curve of diaphragm springs for automobile clutches using residual stress H. ~ e ' , K. Obubol, T. ~ u j i i ' & Y. ~ o r n a n ~ I Department of Mecharzical Engineering, Doshisha University, Japan. ' ~ x e d ~ Corporation, Japan. Abstract The load-deflection (P-6) characteristic curve of diaphragm springs (DS), is extremely non-linear, which determines the feeling of operation and torque capacity of automobile clutches. Shot-peening is implemented during the manufacturing process to improve the fatigue life of DS. Usually the Almen-Laszlo's equation is experimentally adjusted for DS design because of the variation of P-6 curves due to shot-peening. It is necessary to make some trials in conjunction with iterations in order to develop new DS. The present study reveals that the residual stress induced by shot-peening remarkably affects the P-6 curve, and make it difficult to predict the P-6 curve at the design stage. By using non-linear FEM analysis, we clarify the

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