Patent ID: 9200669
Filing Date: 2015-12-01
Classification: B60B,F16C,Y02T

Abstract:
1. A vehicle wheel bearing forming a double row angular contact ball bearing of a back-to-back duplex bearing type comprising: a first pipe member formed into an outer member to fit into a suspension knuckle, and on its inner circumference, the outer member has a radially inwardly projecting annular projection and double row outer raceway surfaces, the inner circumferential surface of the annular projection is formed with a flat configuration, each outer raceway surface has a circular arc cross-section and both ends of the outer member include circular cylindrical surface portions to receive seals; a second and third pipe member formed into a pair of inner rings, each inner ring has, on its outer circumference, an inner raceway surface formed in a circular arc shape arranged opposite to one of the outer raceway surfaces, a shoulder portion axially extending from a larger diameter side of the inner raceway surface, and a smaller diameter side end face axially extending from a smaller diameter side of the inner raceway surface, the end of the smaller diameter side of one inner ring abutting against the end of a smaller diameter side of the other inner ring; double row balls contained between the outer and inner raceway surfaces, respectively, of the outer member and inner rings, said balls held by cages; said seals mounted against ground surfaces in annular openings formed between the outer member and inner rings; the outer member and the inner rings are plastically deformed first, second and third pipe members with the first, second and third pipe members having a substantially uniform wall thickness; and each circular cylindrical surface portion extending outwardly from its respective outer raceway surface to form a seal land portion, the inner rings shoulder portions form a cylindrical circular surface that acts as seal land portions, the outer member seal land portions oppose the inner ring seal land portions forming fitting portions for the seals, and the seal land portions and raceway surfaces are both ground to have predetermined dimensions and accuracy to provide a desired surface to receive the seals and balls, respectively.