The vehicle driving system consists of the body, the axle, the wheels and the suspension. The wheels are supported on each axle (front axle, rear axle), in order to reduce the vibration of the car when driving on uneven road surface, the axle is connected with the body through elastic suspension.
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A single universal cross joint is a kind of unequal speed universal joint. Its characteristic is that when there is an Angle between the driving shaft and the driven shaft, the equal speed transmission can not be carried out, so that the angular velocity of the driving shaft and the driven shaft are not equal periodically.