Abstract: A roller bearing unit having a rotating speed detector includes an outer race, an inner race, a cover made of synthetic resin, a sleeve made cylindrically of metal and a seal ring fitted in an engaging groove of an engaging portion of the cover. The seal ring is disposed between the inner surface of the outer race and the cover so as to prevent the entrance of muddy water into the unit.

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway on an inner peripheral face thereof, a rotatable inner ring member having an inner ring raceway on an outer peripheral face thereof, a plurality of rolling elements provided between the outer ring raceway and the inner ring raceway, an annular tone wheel secured to the end portion of the inner ring member and having a cylindrical peripheral portion formed with rotating cutouts circumferentially with a uniform space therebetween, a cover comprising a synthetic resin block and a metal portion and having a cylindrical engaging portion fixed to the open end portion of the outer ring member by engaging the engaging portion with the inner peripheral face of the outer ring member, an annular sensor embedded in the resin block having a peripheral face such that the peripheral face thereof opposes partly the peripheral portion of the tone wheel, and a guide formed on at least one of the tone wheel a

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway, a rotatable inner ring member having an inner ring raceway, a plurality of rolling elements rotatably provided between the outer ring raceway and the inner ring raceway, a cylindrical magnetic tone wheel fixed to the inner ring member and, having a cylindrical fixing portion fitted onto the inner ring member, a cylindrical detecting portion provided concentric with the cylindrical fixing portion and formed with rotating cutouts, and a stepped portion provided between the cylindrical fixing portion and the cylindrical detecting portion, and a cover comprising a synthetic resin block and a metal portion to be securely mounted to the outer ring member, and an annular sensor embedded in the synthetic resin block so as to be opposed to the tone wheel, and the cylindrical fixing portion having an inner peripheral face on which a plurality of engagement portions are arranged in a single circle to

Abstract: A rolling bearing unit having a rotating speed detector includes an outer race, an inner race, a cover made of synthetic resin, a sleeve made cylindrically of metal, and a seal ring fitted between the cover and the outer race, in which a first leaking passage exists between a first clearance formed on an engaging surface between the sleeve and the outer race and a third clearance formed between the outer race and the cover, the first and the third clearances being arranged in series to each other, and a second leaking passage exists between the third clearance and a second clearance formed in a contact portion of the sleeve with the cover, the third and the second clearances being arranged in series to each other. The single seal ring is capable of preventing the entrance of muddy water into the cover and the outer race through the first and the second clearance.

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway, a rotatable inner ring member having an inner ring raceway, a plurality of rolling elements rotatably provided between the outer ring raceway and the inner ring raceway, a cylindrical magnetic tone wheel fixed to the inner ring member and, having a cylindrical fixing portion fitted onto the inner ring member, a cylindrical detecting portion provided concentric with the cylindrical fixing portion and formed with rotating cutouts, and a stepped portion provided between the cylindrical fixing portion and the cylindrical detecting portion, and a cover comprising a synthetic resin block and a metal portion to be securely mounted to the outer ring member, and an annular sensor embedded in the synthetic resin block so as to be opposed to the tone wheel, and the cylindrical fixing portion having an inner peripheral face on which a plurality of engagement portions are arranged in a single circle to

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway on an inner peripheral face, thereof, a rotatable inner ring member having an inner ring raceway on an outer peripheral face thereof, a plurality of rolling elements provided between the outer ring raceway and the inner ring raceway, an annular tone wheel secured to the end portion of the inner ring member and having a cylindrical peripheral portion formed with rotating cutouts circumferentially with a uniform space therebetween, a cover comprising a synthetic resin block and a metal portion and having a cylindrical engaging portion fixed to the open end portion of the outer ring member by engaging the engaging portion with the inner peripheral face of the outer ring member, an annular sensor embedded in the resin block having a peripheral face such that the peripheral face thereof opposes partly the peripheral portion of the tone wheel, and a guide formed on at least one of the tone wheel

Abstract: A rotational speed detector which is incorporated in an antiskid brake system for an automobile to detect a rotational speed of a wheel. A rotational speed sensor assembly which is provided on either one of the outer and inner rings of a wheel is biased toward a sensor rotor that is provided on the other of the two rings in such a manner that the sensor assembly is slidable on the sensor rotor, thereby maintaining the distance between the rotational speed sensor assembly and the sensor rotor at a constant level.