the strength of pre-stress spring idler is influenced mainly by the axial force, its middle section is dangerouseest, when the idler whirls ,it is affects by small cycled force, its strength can be freated as static state.

After consulting a considerable number of method related to the conventional diaphragm spring clutch and various typical disc spring, we optimized the SAC so far as primary parameters, diaphragm spring and sensor DS be concerned.