Patent ID: 9284863
Filing Date: 2016-03-15
CPC Classification: F01L,F16K

Claim Text:
1. A valve stem seal for sealing a valve stem that is movable in an axial direction, the valve stem seal comprising: a base body configured to be connected to a valve stem guide that receives and guides the valve stem, a first seal lip configured to seal the valve stem relative to an oil chamber such that the first seal lip is oil-tight, a second seal lip spaced in the axial direction from the first seal lip in the direction of the base body and configured to seal the valve stem relative to a gas chamber, wherein a first portion of the second seal lip that is configured to contact the valve stem has a radial cross section that is more rounded than a second portion of the first seal lip that is configured to contact the valve stem, an elastic connection resiliently connecting the first and second seal lips to the base body, wherein no material is interjected into the elastic connection of the valve stem seal between the base body and the second seal lip, and wherein a radial cross section of the elastic connection defines only a single concave section between the base body and the second seal lip, and a support element substantially surrounding the base body of the valve stem seal wherein one of the group of the base body and the combination of the base body and the elastic connection contacts the entire inner surface of the support element, an axial end of the support element proximate to the first seal lip and the second seal lip does not have a radially extending portion that protrudes into another part of the valve stem seal, the valve stem seal being configured to receive an elastic spring element radially therearound, the valve stem seal being configured to support the elastic spring element such that it is axially located between the first seal lip and the second seal lip.