In the process of driving, a car will inevitably encounter rough and uneven road conditions. This kind of road conditions will cause the car to jump and the load will change. Then the output shaft of the transmission and the input shaft of the final drive will be clamped between the output shaft of the transmission and the input shaft of the final reducer. The angle and distance will change accordingly.At this time, the universal joint of the drive shaft was born to solve this problem.

　　First of all, the universal joint on the drive shaft can ensure that under this kind of road conditions, when the relative position of the transmission output shaft and the final drive input shaft changes (changes within a certain range), it can still transmit power normally and reliably. .Secondly, the universal joint can make the two shafts run evenly.

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