| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact wheel bearing device with a rotation detector which prevents abrasion, swelling, and positional shift of a magnetic encoder, and thus performs accurate rotation detection. SOLUTION: In the wheel bearing device wherein rolling elements 5 are interposed between the rolling surface 3 of the inner circumference of the external member 1 of the device and the rolling surface 4 of the periphery of its internal member 2, the magnetic encoder 21 is attached to the external peripheral surface of the internal member 2. To the external member 1, a sensor holder 25 having a built-in magnetic sensor 24 is attached, and the magnetic sensor 24 and the magnetic encoder 21 are axially opposed to each other through a predetermined gap. The portion between the sensor holder 25 and the internal member 2 is sealed by a sealing device 8. As a magnetic encoder 21, a plastic magnetic encoder is used, and in one or both of the magnetic encoder 21 and the internal member 2, engagement sections 21ab, 10a are formed to mutually engage both of these members and regulate the position of the magnetic encoder 21 axially. COPYRIGHT: (C)2010,JPO&INPIT
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