The clutch is located in the flywheel housing between the engine and the gearbox, and the clutch assembly is fixed to the rear plane of the flywheel with screws, and the output shaft of the clutch is the input shaft of the gearbox. While the car is moving, the driver can press or release the clutch pedal as needed to temporarily disengage and gradually engage the engine from the gearbox to cut off or transmit the power input from the engine to the transmission. The clutch is a common component in mechanical transmission, which can disengage or engage the transmission system at any time. The basic requirements are: smooth jointing, rapid and thorough separation, convenient adjustment and repair, small outline size, small mass, good wear resistance and sufficient heat dissipation capacity, convenient operation and labor-saving, commonly used into two categories: tooth inlay and friction type.