Fatigue Fracture Analysis of Stopper Pins in an Automotive Clutch Disk under Unbalance Rotation

초록

Stopper pins in a clutch disk play an important role in transferring the torque from sub-plate to cushion-plate. If stopper pins are broken during the operation of the automotive clutch disk system, it may produce transmission troubles. In this paper, experimental analysis is performed to examine the reasons of the fracture damage. From the experimental analysis, it is deduced that the major reason of the damage is the fatigue phenomenon which occurs due to the unbalancing forces of the rotating disk under periodically repeated loads. In order to reduce the unbalance, a modified clutch disk shape model is designed. Finite element analysis is then carried out on a 3-D model stopper pin to predict fatigue failure. Performance analysis results of the stopper pin in the modified clutch disk model are compared with that of the original model.