Patent ID: 7914382

Claim:
A dual type constant velocity universal joint comprising two constant velocity universal joints, each constant velocity universal joint comprising: an outer ring having an inner circumferential surface and a plurality of guiding grooves that extend in an axial direction formed on said inner circumferential surface; an inner ring having an outer circumferential surface and a plurality of guiding grooves that extend in an axial direction formed on said outer circumferential surface; a plurality of balls for torque transmission; a cage for holding said balls; and a boot having a metal ring, said boot being disposed on a front side of said constant velocity universal joint which accepts a shaft and covering a portion between an outer circumferential surface of said outer ring and the shaft, wherein said guiding grooves in said inner circumferential surface of said outer ring are coordinated with said guiding grooves in said outer circumferential surface of said inner ring to form a plurality of ball tracks, wherein each of said ball tracks has a wedge shape that opens toward a back side of said constant velocity universal joint which is opposite to said front side, and wherein said outer rings of said two constant velocity universal joints are formed as separate bodies and are coaxially integrated together at said back sides.