| 摘要 |
<p>An inner diameter-side hollow-cylindrical member (37) of a supporting ring (36) is fitted on a shoulder (35) of an inner ring (3) constituting a hub. An encoder (29a) is supported at the outer peripheral surface of an outer diameter-side hollow-cylindrical portion (38) constituting the supporting ring (36). Further, on a core metal (30a) fitted in an outer ring (1) is supported and fixed a rotation-detecting sensor (21b), and is joined a base end portion of a seal member (44). The top edge of at least one of seal lips (45a, 45b, 45c) of the seal member (44) is brought to be in sliding contact with the supporting ring (36) over the entire circumference. Since the rotation-detecting sensor (21b) and the seal member (44) are supported by the core metal (30a), a rolling bearing unit can be downsized. Further, since the encoder (29a) is placed on the outer peripheral surface of the outer diameter-side hollow-cylindrical portion (38), the width dimension of a surface with which the top edge of each of the seal lips (45a, 45b, 45c) is brought to be in sliding contact is secured for excellent sealing ability. The structure realizes 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.</p> |
