The clutch is installed between the engine and the transmission, and is an assembly part directly connected with the engine in the automobile drive train. Usually the clutch and the flywheel set of the engine crankshaft are installed together, which is the part that cuts off and transmits power between the engine and the automotive driveline. During the entire process from the start of the car to normal driving, the driver can manipulate the clutch as needed to temporarily disengage or gradually engage the engine and the driveline to cut off or transfer the power output from the engine to the driveline. Its function is to enable the engine and transmission to be gradually engaged, so as to ensure the smooth start of the car; temporarily cut off the connection between the engine and the transmission, in order to facilitate gear shifting and reduce the impact of gear shifting; The separation function prevents overloading of the transmission system such as the transmission, thereby playing a certain protective role.