| 摘要 |
A constant velocity joint for a drive system with a first rotating shaft and a second rotating shaft, comprises: a hollow housing having an open end and a closed end and fixed to the first rotating shaft, an inner face of the housing including a plurality of guide grooves extending in an axial direction and spaced equally apart in a circumferential direction of the housing; and a tripod disposed at an end of the second rotating shaft, having a plurality of trunnions each positioned in a corresponding one of the guide grooves and being spaced equally apart in a circumferential direction of and at an angle normal to the second rotating shaft; and, an inner roller mounted to an outer end portion of each of the trunnions, an outer roller mounted on an outer face of each inner roller with needle rollers engaged between the inner and outer rollers, and allowing the outer face of each outer roller to roll and move in the corresponding one of the guide grooves and for transmitting a load between the first and second rotating shafts to drive the driving system. Each trunnion includes an a spherical surface in a circumferential area subjecting to the load, and a cylindrical protrusion disposed at the spherical surface and protruded to a distance from the at least partially spherical surface in a direction normal to the axis of the respective trunnion, the cylindrical protrusion having an spherical surface at its distal end for surface-to-surface contact with a spherical inner face of the respective inner roller while defining a gap around the cylindrical protrusion and between the spherical surface of the respective trunnion and the spherical inner face of the respective inner roller. The inner face of each inner roller may include a pair of guide grooves, preferably with an elliptical cross section, for receiving the spherical ends of the cylindrical protrusions.
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