Patent ID: 8746199
Filing Date: 2014-06-10
Classification: F01L,F16J

Abstract:
1. A valve stem seal for an internal combustion engine, comprising: a seal body comprising a gas seal assembly axially spaced from an oil seal assembly, the gas seal assembly including a first gas lip and a second gas lip, which is disposed between the oil seal assembly and the first gas lip, and a deformation-resistant reinforcement support ring including a radially-inwardly-extending leg, wherein the seal body includes: wherein the oil seal assembly is disposed in the second portion of the seal body, the first gas lip is disposed in one of the first portion and the third portion of the seal body, the second gas lip is disposed in one of the first portion and the second portion, and the first gas lip and the second gas lip have respective diameters set such that the first gas lip presses against a valve stem associated with the valve stem seal with a relatively large sealing pressure, whereas the second gas lip does not press against the valve stem or presses against the valve stem with a substantially smaller sealing pressure.