| 摘要 |
1. A rod seal or piston seal, consisting of a sealing ring (3) made of an elastomeric material, which ring rests slidingly by way of at least one sealing lip (2) against a machine part (9, 15) capable of relative motion and rests statically by way of at least one second sealing lip (1) against a machine part (6, 12) incapable of relative motion, and which ring further rests by way of a boundary surface on the side facing away from the sealed-off medium against a gap-sealing supporting ring (4) of a tough and hard material which is carried in a groove of the sealing ring (3), the part of the profile of the sealing ring (3) which remains between the supporting ring (4) and the machine part (6, 12) incapable of relative motion resting against a radially-extending surface of the machine part (6, 12) incapable of relative motion, and the ratio of the diameter of the profile of the supporting ring to the radial width of the sealing ring on the side facing away from the pressure being from 0.2 to 0.6, characterised in that the supporting ring (4) has a profile of circular outline, that the groove is bounded by surfaces running in the radial and axial directions, and that the supporting ring (4) rests against the surfaces and defines a free space (11) conjointly with the surface extending in the radial direction and with the machine part (9, 15) capable of relative motion. |
