| 摘要 |
A shaft seal of the type utilizing a metal support element or seal case whic h fits or is inserted into a housing. The seal includes a seal element extending radially inward which when disposed over the shaft causes the seal to flex about a flex section thus ap plying a contacting force to a seal lip, The seal lip includes a plurality of radial undulations along the seal face, said undulations radial with respect to the axis of the shaft. Said seal lip further includin g a static seal for engaging the outer circumferential surface of the shaft, The seal element is formed o f a semi-rigid material such as a fluorinated resin or thermo-plastic elastomer. Such seals exhibit high- wear characteristics opposed to the low-wear characteristics of an elastomer. Further, the seal e lement includes a plurality of symmetrical undulations which provide a hydro-dynamic pumping effect to p ump any fluid migrating along the shaft/seal interface back into the sealed space.
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