| 摘要 |
<p>An object of the present invention is to provide a wheel bearing apparatus for a vehicle which can reduce the sudden slip between the inner member (particularly the caulked portion) and the shoulder portion of the outer joint member and thus can prevent generation of the stick-slip noise. According to the present invention, there is provided a wheel bearing apparatus for a vehicle comprising an outer member integrally formed on its inner circumference with double row outer raceway surfaces; an inner member including a wheel hub and at least one inner ring; seals mounted in openings of annular space formed between the outer member and the inner member; the inner ring being axially immovably secured relative to the wheel hub by a caulked portion formed by plastically deforming an end of the cylindrical portion radially outward; a constant velocity universal joint connected to the wheel hub; an outer joint member of the constant velocity universal joint comprising a cup-shaped mouth portion, a shoulder portion forming a bottom of the mouth portion, and a stem portion fitted into the wheel hub via serrations with a torque transmittable manner; and the wheel hub and the outer joint member being axially detachably connected with the shoulder portion being abutted against the caulked portion characterized in that the end face of the caulked portion is formed as having a flat surface and a cap is mounted on the caulked portion; and that the cap comprises a core metal press-formed of a corrosion resistant steel sheet as having a generally ring shape having a substantially L-shaped cross-section, the inner diameter of the core metal being set slightly smaller than the outer diameter of the caulked portion, and a molded portion formed of synthetic resin having on its surface an infinite number of micro indentations, the cap being abutted against the end face of the caulked portion and the shoulder portion of the outer joint member.</p> |
