| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a rotation speed detection device capable of improving reliability for rotational speed detection by heightening positioning accuracy, while suppressing deformation by heightening rigidity of a protection cover. SOLUTION: The protection cover 10 includes: a cylindrical fitting part 10a formed to have a cup shape by injection molding of a synthetic resin which is a nonmagnetic body, and inserted into an outer member 2; a collar part 10b formed to protrude therefrom to the outward in the radial direction, and in close contact with the end surface 2c of the outer member 2; and a bottom part 10c extending therefrom to the inward in the radial direction, for blocking the end on the inner side of an inner member 1. A metal core 15 formed from a steel plate by press work so as to have an approximately L-shaped section is insert-molded on a portion of the fitting part 10a and the collar part 10b, and a detection part 16 of a rotational speed sensor is positioned close to the outside surface of the bottom part 10c, and is faced to a magnetic encoder 14 through a prescribed air gap, and a rib 17 is formed to protrude on the outside surface of the bottom part 10c except the faced portion. COPYRIGHT: (C)2011,JPO&INPIT |
