The clutch is located in the flywheel housing between the engine and the gearbox. The clutch assembly is fixed on the rear plane of the flywheel with screws. The output shaft of the clutch is the input shaft of the gearbox. When the car is running, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and the gearbox to cut off or transmit the power input from the engine to the transmission. Clutch is a common component in mechanical transmission, which can separate or engage the transmission system at any time. Its basic requirements are: smooth joining, rapid and thorough separation; convenient adjustment and repair; small outline size; small quality; good wear resistance and sufficient heat dissipation capacity; convenient operation and labor-saving. Commonly used are divided into jaw type and There are two types of friction.