A constant velocity joint 1 disposed on the outboard side of a drive axle for transmitting drive power to a wheel, comprising an outer joint member 2 having a plurality of track grooves 3 on the spherical inner peripheral surface 2a, an inner joint member 4 having a plurality of track grooves 5 on t
A constant velocity joint 1 disposed on the outboard side of a drive axle for transmitting drive power to a wheel, comprising an outer joint member 2 having a plurality of track grooves 3 on the spherical inner peripheral surface 2a, an inner joint member 4 having a plurality of track grooves 5 on the spherical outer peripheral surface 4a, torque transmitting balls 6 disposed in a plurality of ball tracks formed by the opposed track grooves 3 and 5 of both joint members 2 and 4, and a cage 8 interposed between both joint members 2 and 4 and receiving and holding the torque transmitting balls 6 in pockets 7, wherein the outboard-side end of the cage 8 is formed with an opening 8x for removably inserting the inner joint member 4 and the inboard-side end is formed with an opening 8y whose diameter is smaller than that of the outboard-side opening 8x.
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What is claimed is: 1. A constant velocity joint comprising: an outer joint member disposed on the outboard side of a drive axle for transmitting drive power to a wheel and having a plurality of track grooves in a spherical inner peripheral surface thereof, an inner joint member having a plurality
What is claimed is: 1. A constant velocity joint comprising: an outer joint member disposed on the outboard side of a drive axle for transmitting drive power to a wheel and having a plurality of track grooves in a spherical inner peripheral surface thereof, an inner joint member having a plurality of track grooves in a spherical outer peripheral surface thereof, torque transmitting balls disposed in a plurality of ball tracks formed by the opposed track grooves of both joint members, and a cage interposed between both joint members and receiving and holding said torque transmitting balls in a plurality of window-shaped pockets, wherein the track groove of said outer joint member has an inboard side with a linear form and an outboard side with a curved form; the track groove of said inner joint member has an inboard side with a curved form and an outboard side with a linear form; an opening formed at the outboard side of said cage has a larger diameter than an opening formed at the inboard side; a thickness of the inboard side of said cage is larger than a thickness of the outboard side thereof; and a total of six torque transmitting balls are respectively accommodated in the pockets of said cage. 2. The constant velocity joint as set forth in claim 1, wherein the outer peripheral surface of the cage is a spherical surface substantially over the entire region, while an inner peripheral surface of the cage is configured such that the surface continuous with the spherical surface of the axial central region is a cylindrical surface on the outboard side and is a spherical surface on the inboard side. 3. The constant velocity joint as set forth in claim 2, wherein the inboard-side end of the cage projects from the inboard-side end of the outer joint member, in the state of the working angle being 0��. 4. The constant velocity joint as set forth in claim 3, wherein the plurality of window-shaped pockets of the cage are formed so that they are all the same in size. 5. The constant velocity joint as set forth in claim 4, wherein the constant velocity joint is of an undercut free type. 6. The constant velocity joint as set forth in claim 5, wherein the constant velocity joint is installed in an uneven terrain traversing mounted type vehicle. 7. The constant velocity joint as set forth in claim 2, wherein the plurality of window-shaped pockets of the cage are formed so that they are all the same in size. 8. The constant velocity joint as set forth in claim 1, wherein the inboard-side end of the cage projects from the inboard-side end of the outer joint member, in the state of the working angle being 0��. 9. The constant velocity joint as set forth in claim 8, wherein the plurality of window-shaped pockets of the cage are formed so that they are all the same in size. 10. The constant velocity joint as set forth in claim 1, wherein the plurality of window-shaped pockets of the cage are formed so that they are all the same in size. 11. The constant velocity joint as set forth in claim 1, wherein the inner joint member is provided directly on an intermediate shaft on an inboard side of the drive axle. 12. An undercut free type constant velocity joint comprising: an outer joint member disposed on the outboard side of a drive axle for transmitting drive power to a wheel and having a plurality of track grooves in a spherical inner peripheral surface thereof, an inner joint member having a plurality of track grooves in a spherical outer peripheral surface thereof, torque transmitting balls disposed in a plurality of ball tracks formed by the opposed track grooves of both joint members, and a cage interposed between both joint members and receiving and holding said torque transmitting balls in a plurality of window-shaped pockets, wherein a total of six torque transmitting balls are respectively accommodated in the pockets of said cage, and wherein dw/dv is set at 3.3-3.6, where dw is a diameter of the outer peripheral surface of said outer joint member and dv is a pitch circle diameter (PCD) of serrations or splines formed on an inner periphery of said inner joint member and used for joining to a shaft member. 13. The constant velocity joint as set forth in claim 12, wherein T1/d1 is set at 0.33-0.35, where T1 is the material thickness of the cage at the axial center of the cage and d1 is the diameter of the torque transmitting balls. 14. The constant velocity joint as set forth in claim 13, wherein the contact angle α of the track grooves of the outer joint member with respect to the torque transmitting balls and the contact angle β of the track grooves of the inner joint member with respect to the torque transmitting balls is set so that both are 31.5��-38.5��. 15. The constant velocity joint as set forth in claim 14, wherein the inboard-side end of the cage may project from the inboard-side end of the outer joint member, in the state of the working angle being 0��. 16. The constant velocity joint as set forth in claim 14, wherein the plurality of window-shaped pockets of the cage are formed so that they are all the same in size. 17. The constant velocity joint as set forth in claim 16, wherein the joint is installed in an uneven terrain traversing, mounted type vehicle. 18. The constant velocity joint as set forth in claim 13, wherein the inboard-side end of the cage may project from the inboard-side end of the outer joint member, in the state of the working angle being 0��. 19. The constant velocity joint as set forth in claim 12, wherein the contact angle α of the track grooves of the outer joint member with respect to the torque transmitting balls and the contact angle β of the track grooves of the inner joint member with respect to the torque transmitting balls is set so that both are 31.5��-38.5��. 20. The constant velocity joint as set forth in claim 19, wherein the inboard-side end of the cage may project from the inboard-side end of the outer joint member, in the state of the working angle being 0��. 21. The constant velocity joint as set forth in claim 12, wherein the inboard-side end of the cage may project from the inboard-side end of the outer joint member, in the state of the working angle being 0��. 22. The constant velocity joint as set forth in claim 12, wherein a cylindrical inner surface of the cage extending to the outboard side edge is parallel to a straight section of the outer peripheral surface of the inner joint member. 23. The constant velocity joint as set forth in claim 12, wherein the inner joint member is provided directly on an intermediate shaft on an inboard side of the drive axle.
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