Bearing apparatus for a driven shaft of an automobile, having a rotational speed detector.

摘要

A bearing apparatus is capable of detecting rotational speed of a driven shaft (2d) of an automobile. The bearing apparatus has a rotational speed detector (7) and a detected member (3). The detected member (3) is fixed to an inside member (2) rotating with the driven shaft (2d). The detected member (3) has a hollow cylindrical portion (3b) which extends in an axial direction and is provided with a plurality of projections (3a) at even intervals in a circumferential direction on an inner peripheral surface of the hollow cylindrical portion. The rotational speed detector (7) is fixed to a bottom of a cover (6) for covering the rotational speed detector and the detected member. A detector portion (7a) of the rotational speed detector (7) is positioned within the hollow cylindrical portion (3b) so as to oppose the projections (3a).