A kinematic chain is usually identified as a mechanism if its primary purpose is the modification or transmissionofmotion.
阿运动链通常认定为一种机制，如果其主要目的是修改或运动传递。
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The controllable worm drive can realize the stepwise motionof worm wheel, therefore, it is very available for transmission with special requirement and feeder control of some ingenious mechanisms.
The general motion equation of rigid body in gyroscopic theory is used to analyze the motionof double universal joint in the transmission system of engineering mechanism vibration grinder.