Constant velocity joint of tripod type

  • US 6,533,668 B2
  • Filed: 10/15/2001
  • Issued: 03/18/2003
  • Est. Priority Date: 10/16/2000
  • Status: Active Grant
First Claim
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1. A constant velocity joint comprising:

  • a hollow housing having an opening at one end, and being secured at its opposite end to a first rotating shaft such that a central axis of the housing is aligned with that of the first rotating shaft, an inner face of the housing being provided with three guide grooves extending in an axial direction of the housing and being spaced apart equally in a circumferential direction, each groove having a pair of side faces opposed to each other, extending in the axial direction, and a bottom portion connecting between the side faces; and

    a tripod provided at an angle normal to a second rotating shaft and secured to one end of the second rotating shaft, the tripod having three trunnions positioned in the grooves, the trunnions being spaced apart equally in a circumferential direction and securing equally to the second rotating shaft at an angle normal, with respective inner rollers being mounted to outside end portions of respective trunnions, and with respective outer rollers being mounted on the outer faces of inner rollers through a needle bearing, the outer faces of the outer rollers being shaped so as to allow movement only in an axial direction of the guide grooves, the side faces receiving a load, and a part of the bottom portion guiding the rolling of the outer roller;

    the inner rollers having a spherical inner circumferential surface, respectively; and

    the trunnions having an elliptical shape in the sectional view normal to each of their axes, respectively and positioned so that the short diameter of the ellipse is substantially parallel to the second rotating shaft.

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