The cross shaft is the universal joint cross , which can also be called ten bytes. It is a part that realizes variable-angle power transmission. It is used to change the position of the transmission axis. It is the "joint" of the universal transmission device of the automobile drive system. part. The cross-shaft rigid universal joint is a variable speed universal joint widely used in automobiles, and the maximum angle of intersection between two adjacent shafts is allowed to be 15゜～20゜. The cross shaft is one of the key parts of the cross shaft rigid universal joint.

The main component of a universal joint transmission device is a universal joint, which is generally composed of a universal joint and a transmission shaft. For a segmented transmission shaft with a long transmission distance, an intermediate support is also required. The universal joint nephew is mainly composed of universal joint fork, cross shaft and bearing. Two universal joint forks are respectively connected to the main and driven shafts, and the holes in the fork shape are respectively sleeved on the four journals of the cross shaft.

Of course, most of the existing bearings still need regular repairs and maintenance. Although there are now maintenance-free bearings , not many people use them.