| 摘要 |
A sealing assembly for the arms (6) of a cross member (5) of a universal joint has a seal (16) with a fixing portion (17) including a bore (18) which rests on the arm (6). In the region of its bore (18), the fixing portion (17) includes axially extending grooves (19) which open towards the bearing interior and the second end face (22) of the fixing portion (17), respectively. Towards the outside, the grooves are closed by a sealing lip (25). The sealing lips (30, 31), which have a sealing effect relative to the sealing face (32) of the bearing bush (7), are arranged at annular portions (28, 29). The sealing lip (30) closes under the pressure of lubrication. During the lubricating process, the lubricant is able to escape outwardly through the grooves (19) and the gap between the lifted sealing lip (25) and the annular shoulder (24). By separating the sealing function between the cross member and bearing bush when the two parts move relative to one another and the lubricating function via the channels, an improved sealing effect is achieved. When the internal pressure rises, the contact pressure of the sealing lip is adjusted by making use of the self-closing effect. The opening function of the sealing lip closing the lubricating grooves may accordingly be adjusted to the lubrication pressure which is usually higher.
|
