The active part and the driven part of the clutch act on the friction between the contact surfaces, or use the fluid as the transmission medium (hydraulic coupling) or the magnetic transmission (magnetic clutch) to transmit the torque so that the torque between the two can be Temporary separation, but also gradually joined, in the transmission process allows the two parts to rotate. 
The clutch is located in the flywheel housing between the engine and the transmission, and the clutch assembly is fixed to the rear surface of the flywheel with screws. The output shaft of the clutch is the input shaft of the transmission. During driving of the vehicle, the driver may depress or release the clutch pedal as required to temporarily disengage and gradually engage the engine from the transmission to cut off or transmit power input by the engine to the transmission. Function 1. Ensure that the car is stationary before starting the car. If the engine and the transmission are rigidly connected, once the file is hung up, the car will suddenly rush forward due to the sudden power connection. This will not only cause mechanical damage, but also drive the car. The force is not enough to overcome the huge inertia force generated by the vehicle's forward stroke, causing the engine speed to drop sharply and turn off.
The wiper clutch should meet the following basic requirements:
(1) Ensure that the maximum torque generated by the engine can be transmitted, and there is a certain amount of transmission torque remaining.
(2) It can be completely separated when it is separated, soft when it is joined, and has good heat dissipation capability.
(3) The rotational inertia of the driven part is as small as possible. In this way, when the clutch is disengaged, the rotational speed of the portion connected to the input shaft of the transmission is relatively easy to change, thereby reducing the impact between the gears.
(4) It has the ability to ease the impact of the direction of rotation, attenuate the vibration in that direction, and has a low noise.
(5) The pressure of the pressure plate and friction coefficient of the friction plate change little, and the operation is stable.
(6) Maneuvering is easy and maintenance is easy.