| 摘要 |
Belt or chain tensioning roller device (1) comprising a fixed member (2) intended to hold the device (1) on an external element (3), a moving member (4) that can move angularly with respect to the fixed member (2) and a roller or pulley (5) supported by the moving member (4) and intended to be in contact with the belt or the chain, the fixed member (2) comprising an adjusting eccentric (6) and the moving member (4) comprising a working eccentric (9) mounted to rotate on the adjusting eccentric (6) and a rolling bearing (13), the rolling bearing (13) comprising an external ring (17), an internal ring (16) and at least one row of rolling elements (18) arranged between the internal (16) and external (17) rings. Each row of rolling elements (18) is in contact via two contact zones at least with the internal ring (16), the internal ring (16) being a thin-walled ring produced by pressing or drawing a sheet or a tube. |
