Patent ID: 7529507

Claim:
A constant-velocity joint comprising: an outer ring having a central axis and a hexagonal cross-section, said outer ring formed with a bore defined by six flat surfaces that are parallel to said central axis; and a trunnion member configured to be received in said bore of said outer ring, said trunnion member having an outer periphery formed with: three first spherical surfaces circumferentially spaced apart from each other; and three second spherical surfaces circumferentially spaced apart from each other and each disposed between adjacent ones of said first spherical surfaces, wherein each of said first spherical surfaces contacts a respective one of said flat surfaces at a point offset from a circumferential center of said one of said flat surfaces in one of two circumferential directions of said outer ring when received in said bore of said outer ring, and wherein each of said second spherical surfaces contacts a respective one of said flat surfaces at a point offset from a circumferential center of said another of said flat surfaces in the other of said two circumferential directions when received in said bore of said outer ring; wherein the entire outer ring, including said bore, and the entire trunnion member, including said outer periphery, are each made of an injection-moldable synthetic resin.