| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device enabling prevention of peeling off and scratching of a rust-proofing film in a production step, formation of the rust-proofing film by a simple step and improved productivity and reliability regarding rust-proofing treatment of a hub wheel pilot part. Ž<P>SOLUTION: The present invention is applied to the wheel bearing device in which a rolling body 5 is interposed between rolling surfaces 3, 4 of an outer member 1 and an inner member 2. A rotation side member of the outer member 1 and the inner member 2 makes a hub wheel 9 as a constitution part. The hub wheel 9 has a wheel mounting hub flange 9a; and a cylindrical pilot part 13 projected from a neighborhood to a flange base part to an outboard side and guiding a brake rotor mounted to the hub flange 9a and the wheel. A chemical processing layer such as a manganese phosphate treatment layer 17 is formed on a peripheral surface of the pilot part 13. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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