The diaphragm spring is a circular disc manufactured from high quality spring steel. The spring portion contains several fingers that are moved back and forth to engage and disengage the clutch. The force generated by the diaphragm spring provides the load necessary to clamp the clutch disc between the pressure plate and flywheel. A diaphragm spring of clutch cover is connected with cover plate and pressure plate. Diaphragm spring loads push pressure plate and clutch disc by clutch pedal. The rotation power of engine is transferred from flywheel, which is connected with crankshaft to transmission throw clutch disc, located between flywheel and pressure plate. When push clutch pedal by driver, release bearing push diaphragm spring and then it is lifted the pressure plate toward vertical-axle direction.