| 摘要 |
A slip joint seal assembly includes an elastomeric sealing body and an annular metallic cage circumferentially supporting the body. The assembly also includes a relubrication chamber. An auxiliary sealing lip on the elastomeric sealing body is normally out of contact with a shaft, but engages the shaft upon pressurization of the relubrication chamber to prevent lubrication from flowing toward primary sealing lips on the sealing body during relubrication. In a preferred form, the elastomeric sealing body includes a pair of sealing lips disposed for making angular contact with the shaft, while the auxiliary lip is also angularly disposed with respect to the shaft but in an axially opposite direction. In an alternate preferred form, an annular ring provides a reduction in volume of the relubrication chamber between the cage and shaft to enhance pressurization characteristics of the chamber. |
