CONSTANT VELOCITY UNIVERSAL JOINT

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive constant velocity universal joint capable of securing sealability and durability of a boot in a simple configuration.SOLUTION: The constant velocity universal joint includes a cup-shaped outside joint member having an opening at one end, and an inside joint member for transmitting torque via a torque transmission member between the outside joint member and itself while allowing angular displacement. A small-diameter end 24 of a boot 18 closing the opening of the outside joint member is fastened and fixed to a mounting site 22 of a shaft 17 extending from the inside joint member with a boot band 23. An annular recessed groove 28 which is formed in the outer peripheral face of the small-diameter end 24 of the boot 18 and to which the boot band 23 is fitted consists of a first curved face 30 circularly curved ranging from the center position of the groove width to the boot front end side with a curvature radius R1, and a second curved face 31 circularly curved ranging from the center position of the groove width to a boot base end side with a curvature radius R2.SELECTED DRAWING: Figure 1