The pull rods with ball joint connections are not fixed during movement. In order to make the pull rods flexible and free, a ball joint is designed and installed on both ends of the pull rod to balance the rod rubber. Like steering tie rods, vertical links, transmission tie rods, vertical links, etc.

A pull rod with a ball head shell, the ball head of the steering spindle is placed inside the ball head shell, and the balance rod adhesive is hinged with the edge of the shaft hole of the ball head shell through the ball head seat at the front end. The roller needle between the ball head seat and the steering spindle is embedded in the groove of the hole surface of the ball head seat. The production process of the balance rod adhesive of this utility model has the characteristics of reducing ball head wear and improving the tensile strength of the spindle.