| 摘要 |
1510227 Rotary seals VOLVO AB 8 Dec 1975 [10 Dec 1974] 50297/75 Heading F2T An axially acting seal in a rotary brake drum, comprising a conical member 5 of elastic material firmly attached to the brake drum 1 and having an edge 6 for forming a rubbing seal with a planar surface 7 of an associated stationary member 8, is characterized by a plurality of ballast members of higher density than that of the elastic material, e.g. lead balls 14, provided in the conical member 5, so that in use, the edge 6 is moved away from the planar surface 7 by centrifugal force when its rotational speed exceeds a predetermined value. |
