球叉式等速万向节。由有滚道的球叉和钢球组成的万向节。而其中的圆弧槽滚道型球叉式万向节是指球义上的钢球滚道为圆弧型的万向节。其节结构特点是在球叉的主动叉和从动叉上做有圆弧凹槽，两者装合后形成四个钢球滚道，滚道内共容纳4个钢球。定心钢球装在主、从动叉中心的球形凹槽内。直槽滚道型球叉式万向节是指球叉上的钢球滚道为直槽滚道型的万向节。它的结构特点是在两个球叉上做有直槽，各直槽与轴的中心线相倾斜，且倾斜的角度相同并彼此对称。于两个球叉之间的滚道内装有4个钢球。
Ball fork type constant velocity joint. A universal joint composed of a ball fork with a raceway and a steel ball. The arc groove raceway type ball fork universal joint refers to the arc-shaped universal joint on the ball. The structural feature of the joint is that there are arc grooves on the driving fork and driven fork of the ball fork. After the two are assembled, four steel ball raceways are formed, and four steel balls are contained in the raceway. The centering steel ball is installed in the spherical groove in the center of the driving and driven fork. Straight groove raceway type ball fork universal joint is a kind of universal joint whose steel raceway on the ball fork is straight groove raceway type. Its structural feature is that there are straight grooves on the two spherical forks, each of which is inclined to the center line of the shaft, and the inclined angles are the same and symmetrical with each other. Four steel balls are arranged in the raceway between the two ball forks.