| 摘要 |
An oscillatory shaft extends through a wall of a stationary body. A flat, annular, elastomeric, sealing plate is sealingly fixed at its inner periphery to the wall and at its outer periphery to a collar on the shaft. The collar is encircled by the wall with an annular gap between them. At one face of the plate two intermediate elastomeric rings lie between the plate and the wall and between the plate and the collar, respectively. On a pressure difference occurring across the plate, the two rings are thereby deformed to close an annular space between them in the region of the gap, thereby supporting the plate against penetration into the gap.
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