| 摘要 |
A rolling bearing unit with rotating speed detector comprising an inner ring member with an inner ring raceway and a rotatable outer ring member with an outer ring raceway, a plurality of rolling bodies provided between the inner ring raceway and outer ring raceway, an annular, magnetic tone wheel fitted to the outer ring member, a support ring fitted to the axial end of the inner ring member, an annular sensor supported by the support ring so as to be faced to the tone wheel generally in a circumferential direction, the sensor comprising an annular magnetic pole piece, annular permanent magnet and annular coil, so that one end in magnetic orientation of the permanent magnet is placed adjacent to one end portion of the pole piece, while the other end in magnetic orientation is placed magnetically adjacent to the tone wheel, the coil provided adjacent to the pole piece, the tone wheel having cut-outs formed with a uniform pitch in a circumferential direction and faced across a clearance to a portion of the pole piece where the magnetic property changes in a circumferential direction with the same pitch to that of the cut-outs, and an annular member fitted to the outer ring member in a mating relationship with the support ring to prevent the ingress of dust and rainwater into the bearing portion. |
