Patent ID: 7367890

Claim:
A yoke-trunnion universal joint, consisting of: drive shafts, yokes with bosses connected with said drive shafts; sleeves fixed in said bosses, said sleeves having cylinder cup shape; a cross having four trunnions, said trunnions being disposed in said sleeves; plastic anti-wear coatings disposed between said sleeves and said trunnions for lubrication, anti wear and absorbing vibration; said plastic anti-wear coating covering the inner surface and inner bottom of said sleeve becoming a cylinder cup shape; a combining means for combining said plastic anti-wear coatings with said sleeves or said trunnions tightly; said combining means consisting of a radial flange extended outward from the bottom of said plastic anti-wear coating with a cylinder cup shape and a radial groove at the inner bottom of said sleeve, said radial flange embedding into said radial groove, thereby said plastic anti-wear coating with cylinder cup shape connecting with said sleeve with cylinder cup shape tightly.