| 摘要 |
A bearing unit for a pulley, particularly for use as a belt tensioner, comprises an outer race (13) adapted to be co-moulded with a plastic material to form an outer wheel element (11) fast for rotation with said bearing outer race (13), a groove (14) eccentric to the bearing axis of rotation (x) is formed in the outer cylindrical surface (12) of said outer race (13), whereby said groove (14) produces in the co-moulded plastic material a complementary portion (19) preventing relative rotation between the outer wheel element (11) and the bearing outer race (13). |
