JP2001194376A5 - - Google Patents

Claims (2)

The hub is provided with a first flange for mounting the wheel on the outer peripheral surface of the outer end, a first inner ring raceway on the outer peripheral surface of the intermediate portion, and a second inner ring raceway on the outer peripheral surface. An inner ring that is externally fitted to a step portion having an outer diameter smaller than that of the portion provided with the first inner ring raceway provided at the inner end portion of the first inner ring raceway, and an inner peripheral surface that faces the first inner ring raceway. An outer ring formed with a second flange for supporting a first outer ring raceway and a second outer ring raceway facing the second inner ring raceway on a suspension on the outer peripheral surface, and the first and second Between the inner ring raceway and the first and second outer ring raceways, a plurality of rolling elements provided so as to be capable of rolling, respectively, and fitted on at least the stepped portion at the inner end of the hub. Formed by caulking and expanding the cylindrical part formed in the part protruding inward in the axial direction from the inner ring outward in the diametrical direction A wheel support rolling bearing unit in which the inner ring externally fitted to the stepped portion is pressed against the stepped surface of the stepped portion by the crimped portion, and the inner ring externally fitted to the stepped portion is coupled and fixed to the hub. It has a ring-shaped detected part in which the magnetic characteristics over the circumferential direction of the side surface are changed alternately and at equal intervals, and the inner ring and the outer ring of the inner ring are separated from the second inner ring track. A concentrically fixed encoder and a detection unit are supported with respect to the outer ring or the suspension device in a state where the detection unit is opposed to the inner surface of the detection unit, and a change in magnetic characteristics of the detection unit In a rolling bearing unit with a rotational speed detection device that is combined with a rotational speed detection device that includes a sensor that changes an output signal corresponding to the outer diameter of the caulking portion. It is also large at the tip of the sensor. A portion facing the detected portion exists on the inner side in the axial direction than the caulking portion, and a portion of the portion facing the detected portion is radially inner than the outer peripheral edge of the caulking portion. A rolling bearing unit with a rotational speed detection device characterized by The rolling bearing unit with a rotational speed detection device according to claim 1, wherein an inner side surface of the detected portion projects inward in an axial direction from an inner end surface of the caulking portion.