| 摘要 |
An elastomeric seal lip contacts a cylindrical wear surface along a sealing edge formed by the convergence of two conical surfaces on the seal lip, and accordingly a region behind the seal lip is isolated. On the conical surface that is presented away from the isolated region, the seal lip is provided with embossments that project toward, but normally do not contact the wear surface. However, when the seal lip is distorted by an increase in pressure within the isolated region, the embossments contact the wear surface and serve as fulcrums, enabling the entire lip to pivot sufficiently to lift the sealing edge away from the wear surface. This vents the isolated region and allows the seal lip to return to its normal configuration. The embossments may also function as elastohydrodynamic pumping elements. |
