无滑动、摩擦、转动部件，可降低能量损失。
No sliding, friction, rotating components, can reduce the energy loss.
通过两个部分的摩擦力用一个部分转动另一个部分的离合器。
A clutch in which one part turns the other by the friction between them.
转动副采用纳米塑料薄层，减小摩擦系数，提高效率。
Revolving join is maddening that plastic of nanometer technique coat, in order to reduce the coefficient of friction for increased efficiency.
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