| 摘要 |
A valve stem seal can include an elastomeric component having a first portion for having a sealed engagement with a valve stem (34), and a pressure relief lip engaging a valve guide (36). The pressure relief lip can have a sealing configuration and a venting configuration. The venting configuration can allow excess exhaust gases to vent from a combustion chamber (26). After the venting of excess exhaust gases, the pressure relief lip can close to the sealing configuration to prevent oil from entering the combustion chamber (26). The elastomeric body or the valve guide can include a pressure relief channel. The elastomeric body can also include a bumper engaging the valve guide (36). The pressure relief channel can be disposed in the bumper. |
