| 摘要 |
A universal joint has first and second shafts respectively including a pair of yoke portions, and a ball is disposed between the first and second shafts for movably interconnecting the two separate half- elements together forming the respective pair of yoke portions. Base seats, respectively having a truncated cone shape, are provided in mutually opposing faces of the yoke portions. Each virtual cone has a virtual vertex having an angle of substantially 90 degrees. At the same time the virtual vertexes of the cones are substantially in contact with each other. The base seats respectibely define arc faces in mutually opposing surfaces.
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