Patent ID: 6254276
Filing Date: 2001-07-03
Classification: F16C,G01P

Abstract:
A rolling bearing unit comprising:a hub having an inner end,a stationary member comprising an outer ring having an inner peripheral surface formed with a first raceway,a rotatable member comprising an inner ring having an outer peripheral surface formed with a second raceway, a shoulder section adjacent the second raceway on the inner end side, and an inner peripheral surface fitted onto the hub, the inner ring fixedly connected to the hub by crimping the inner end of the hub outward,a plurality of rolling members rotatably provided between the first raceway and the second raceway to rotatably support the inner ring,an encoder fixedly fitted to a portion of the inner ring on the inner end side of the second raceway, and having a detected portion in a circular ring shape, which has magnetic characteristics changing circumferentially with a uniform pitch,the detected portion having a first portion smaller in diameter than the shoulder section of the inner ring and a second portion larger in diameter than the shoulder section, anda sensor fixed to the stationary member and having a detecting portion provided adjacent the detected portion of the encoder to detect the rotational speed of the encoder.