The moving joint is connected to the planetary gear of the transmission through a spline, and the power output from the transmission is mainly input to the constant speed drive shaft assembly . The moving joint includes a three-ball pin and a three-column grooved shell. The fairway of the three-column grooved shell is linear, so that the three-ball pin can slide axially in the moving joint, so that when the car passes bumps, turns or is vacated, the track length is extended or Shortened distance.

The flange-type inner ball cage has a simple structure and is easy to disassemble and attach. It is connected with the output of the differential by bolts, and has a firm positioning. The product strength and transmission torque are greatly enhanced, making it safer to use in automobiles.