| 摘要 |
A double Cardan universal joint is provided with improved centering members. One end yoke of the joint has circular ridges or teeth and a central tooth facing the other end yoke with the center line of the teeth being coaxial with the axis of rotation of the one yoke. The other end yoke has circular ridges or teeth and a central recess facing the one end yoke with the center line of those teeth and recess being coaxial with the axis of rotation of that yoke. The teeth are positioned so that one tooth extends between two teeth of the other yoke for any position of the end yokes and the drive and driven members or shafts to which they are attached. The sets of teeth are in patterns of spherical segments so that any longitudinal cross section taken centrally through the teeth has the same general appearance as a section gear through a segment. In a preferred form, the tooth profile or shape in transverse section is such that intermediate portions are thicker than both inner and outer end portions. The center tooth is also thicker in transverse cross section than the other teeth and the central recess is wider in transverse cross section than grooves between the teeth.
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