| 摘要 |
A constant velocity ratio universal joint of plunging type, comprising an outer joint member (1), an inner joint member (2), facing pairs of tracks (3, 4) in the joint members receiving balls (5) for torque transmission, and a cage (6) constraining the balls and having first and second control surfaces (7, 9) with centers of curvature unequally off-set from the ball center plane I, in order to guide the balls to the bisect or plane, wherein the first control surface of the cage comprises two portions (71, 72). The first portion (71) is part-spherical, and the second portion (72) is a surface of revolution about the axis of the cage of an arc of radius of curvature less than the radius of curvature of the part-spherical portion (71). The effect of the unequal off-set of the control surfaces of the cage is to compensate for axial thrusts on the balls when the joint is articulated, and the provision of the two portions of the first control surface has the effect of reducing such compensation with increasing articulation, thereby preventing possible jamming of the balls.
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