| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure which can prevent the contamination of a brake rotor constituting a disc brake even if grease leaks from a seal ring which seals an axial end opening of an internal space.SOLUTION: An axial outer end face of an outer ring 2a and an axial inside face of a thin-thickness part 20a closely oppose each other in an axial direction, and an axial outer end part internal peripheral face of the outer ring 2a and a continuous part 21a closely oppose each other in a radial direction, thus forming a labyrinth seal. A large-diameter step part 27 which is larger than in diameter than an inside diameter of the axial outer end face of the outer ring 2a is formed at the axial outer end part internal peripheral face of the outer ring 2a, and the large-diameter step part 27 is superimposed on a ridge part 22a which is formed at a radial outer end ridge of a heavy-thickness part 19a in the radial direction.SELECTED DRAWING: Figure 1 |
