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。
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.