| 摘要 |
An inner diameter-side cylindrical member 37 of a supporting ring 36 is externally fitted on a shoulder 35 of an inner ring 3 constituting a hub. An encoder 29 a is supported on the outer peripheral surface of an outer diameter-side cylindrical portion 38 constituting the supporting ring 36 . Further, to a metal core 30 a internally fitted to an outer ring 1 is supported and fixed a rotation-detecting sensor 21 b, and also a proximal end portion of a seal member 44 is connected and fixed thereto. An edge of at least one of seal lips 45 a, 45 b, 45 c of the seal member 44 is brought to be in sliding contact with the supporting ring 36 around the entire circumference. Since the rotation-detecting sensor 21 b and the seal member 44 are supported by the core metal 30 a, a rolling bearing unit can be downsized. Further, since the encoder 29 a is placed on the outer peripheral surface of the outer diameter-side cylindrical portion 38 , the width dimension of a surface with which the edge of each of the seal lips 45 a, 45 b, 45 c is brought to be in sliding contact is secured for excellent sealing ability. The structure provides a rolling bearing unit with a rotating speed-detecting device, where the bearing unit is downsized and has a construction capable of achieving excellent sealing ability.
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