The amount of force the clutch can hold depends on the friction between the clutch plate and they flywheel, and how much force the spring puts on the pressure plate.
离合器能传递的力的大小取决于离合器盘和飞轮之间的摩擦系数，以及弹簧对压盘的压紧力的大小。
2
As the driver lets loose the clutch pedal, springpressure increase on the clutch parts. Friction between the parts also increases.
一旦驾驶员松开离合器踏板，弹簧力就迅速作用在离合器上，摩擦力就随之增加。
3
There is no springpressure on the clutch assembly parts. So there is no friction between the driving members and driven members.