A rolling bearing for a wheel of a vehicle and a semi-float type bearing apparatus having it

摘要

The bearing has a sensor (17) passing through a cylindrical holding portion (15b) arranged opposite the annular seal (11) of an inboard sealing device (10) or through the end of an outer ring (1), and opposing a magnetic encoder (16) to keep a predetermined gap between the encoder and sensor. The inboard sealing device is arranged with an outboard sealing device for sealing annular space between the outer ring and inner ring (4) of the bearing. The inner ring is fitted on the stepped portion (7a) formed on a wheel hub. The outer ring is mounted on a stationary portion, and formed with a double row outer raceway surfaces opposing the double-row inner raceway surfaces of the inner ring. Tapered rollers (5) are arranged between the outer ring and inner ring. The encoder is mounted on the cylindrical holding portion arranged opposite the annular seal which is fitted on one end of the outer ring. The encoder has magnetic poles formed by magnetic powder and alternating the polarity along its circumferential direction.