Patent ID: 8328650

Claim:
A constant velocity universal joint comprising: an outer joint member having an opening end section; an inner joint member accommodated inside the outer joint member and connected to the outer joint member so that torque can be transmitted therebetween; and a boot having a first end section and a second end section, wherein the first end section of the boot is installed on an outer peripheral surface of the opening end section of the outer joint member, the second end section of the boot is installed on an outer peripheral surface of a shaft member extending from the inner joint member, one of the first and second end sections of the boot has a protruding section formed on its inner peripheral surface that is fitted into a fitting groove formed on a respective one of an outer peripheral surface of the opening end section of the outer joint member and an outer peripheral surface of the shaft member, the one of the first and second end sections of the boot also has sealing sections with a tapered shape provided annularly on portions of its inner peripheral surface excluding the protruding section, the sealing sections are provided on the inner peripheral surface of the one of the first and second end sections at locations that are within an axial width of an area of an outer peripheral surface of the one of the first and second end sections of the boot where a fixing component is to be installed, the sealing sections are in close contact with portions excluding the fitting groove on the one of the outer peripheral surface of the opening end section of the outer joint member and the outer peripheral surface of the shaft member, and a portion of the respective one of the outer joint member and the shaft member formed at an intersection of a curved surface section of the fitting groove and the outer peripheral surface bites into the inner peripheral surface of the one of the first and second end sections of the boot due to the fixing component.