Patent ID: 8647210

Claim:
A constant velocity universal joint, comprising: an outer joint member having at least one end portion that is open; an inner joint member for transmitting torque together with the outer joint member through torque transmission members under a state in which angular displacement is allowed; and a boot for closing an opening portion of the outer joint member, the boot having; an end portion fitted onto a shaft extending from the inner joint member, the end portion including a fixed region where the end portion is fixed to the shaft with a boot band; a lip portion abutting on an outer peripheral surface of the shaft; and a ventilation groove provided at the fixed region and communicating between an inside and an outside of the boot, wherein the lip portion has at least one ventilation hole provided therein, the lip portion and the ventilation groove are formed at an inner peripheral surface of the end portion of the boot, the lip portion is located at a distance away from the fixed region of the end portion, and the lip portion is adapted to prevent leakage of lubricant.