Comparison on Hysteresis Movement in Accordance with the Frictional Coefficient and Initial Angle of Clutch Diaphragm Spring

Clutch system influences the clutch pedal force of an operator in accordance with the characteristics of each part. Hence, the purposes of this study are to establish a mathematical model on the diaphragm spring of clutch cover and to identify the basic characteristics for each mathematical model. Also in this study, the characteristics of hysteresis as to the load-displacement will be analyzed depending on the initial angle and frictional coefficient. As a result of the interpretation, both the clamp load and release load tended to widen the hysteresis width when the frictional coefficient increased. This result implies that the load will also increase when the frictional force increases. Moreover, the hysteresis value has also increased when the initial pressure angle increased with uniform frictional coefficient. This result may be explained by the fact that higher hydraulic pressure of master cylinder was exerted to clutch system when a driver presses a pedal with a large angle. Comparing with the measured data, a frictional coefficient of 0.4 and an angle of 13 degrees would be considered most suitable.