The mechanical structure that uses the ball connection to realize the power transmission of different shafts is a very important part of the bearing on the automobile.The front-engine front-wheel drive vehicle omits the transmission shaft, and the universal joint is installed between the front axle half shaft and the wheels that are responsible for driving and steering.On a front-engine rear-wheel drive vehicle, the universal joint transmission is installed between the transmission output shaft and the input shaft of the transaxle final drive.The combination of universal joint and drive shaft is called universal joint transmission.

　　When the active fork is in the vertical position of the linear bearing, and the cross axis plane is perpendicular to the active axis.At this time, the linear velocities of the connecting point of the driving fork and the cross shaft and the connecting point of the driven fork and the cross shaft on the axis plane of the cross special bearing are equal.The speed projection of the driven fork to the cross-axis plane. Because the relative position of the transmission and the main reducer is constantly changing when the non-independently suspended thrust roller bearing frame is used, the unequal speed can only be as small as possible.

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