| 摘要 |
A bearing for a wheel of vehicle having a structure for preventing penetration of rain water at the fitted portion of a sealing plate to improve the life of bearing and for protecting a magnetic encoder (15,25) forming a seal. A sealing device (12,21) of inboard side of the bearing for a wheel of vehicle of the third generation comprises a first sealing plate (13,23) mounted on an inner ring (3), and a second sealing plate (14,24) mounted on an outer member (10) arranged oppositely to the first sealing plate (13,23). The first sealing plate (13,23) has a radially extending portion arranged inbord side of the bearing. Bonded on the radially extending portion is an encoder (15,25) made of elastomer material with which magnetic substance powder is mingled and in which N and S poles are alternately magnetized along the circumferential direction thereof. The second sealing plate (14,24) has a substantially "L"-shaped cross-section formed by a cylindrical portion and a radially extending portion and is integrated with side-lip(s) slide-contacting with the radially extending portion of the first sealing plate (13,23). In Fig. 2 the first sealing plate (14) extends to a radially innen direction, so that an exposed portion of the inner ring (3) of the bearing is covered by the first sealing plate (14). In Fig. 5 an additional protecting cover (27) is mounted on the first sealing plate (23) so that it intimately contacts with the encoder (25).
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