Dry valve stem seal
AssigneeDana Corporation
InventorTim Hegemier
Life of this patent
Estimating the term…
Abstract
A valve stem seal assembly includes two annular hydraulic seals separated by a generally flat support member, where the seals are axially positioned back to back on an upper free end of a valve stem. The seals and the washer are secured along a radially outer circumference by a retainer, a lower portion of which contacts an upper surface of a valve guide. The valve stem is slideably sealed by an inner annular surface of both hydraulic seals.
Claims18
A zero-leak valve stem seal assembly, comprising:
- upper and lower annular hydraulic seals separated by a generally flat annular support member, each said seal having a generally U-shaped radial cross section formed from a pair of spaced longitudinally extending legs and a radially extending transverse portion extending between said legs, wherein said seal transverse portions are located adjacent said support member;
- and a retainer contacting an outer circumference of said seals and said support member.
In a valve assembly of an internal combustion engine including a valve stem reciprocating within a valve guide, a seal for sealing the valve stem against oil flow through the valve guide comprising:
- upper and lower annular hydraulic seals separated by a generally flat annular support member, each said seal having a generally U-shaped radial cross section formed from a pair of spaced longitudinally extending legs and a radially extending transverse portion extending between said legs to form a concave cavity therein, wherein said seal transverse portions are located adjacent said support member;
- a pair of springs, each said spring located in the radial cross-section of said upper and lower seal;
- and
- a retainer contacting an outer circumference of said seals and said support member.
A zero-leak valve stem seal assembly, comprising:
- upper and lower annular hydraulic seals separated by an annular support member, each said seal having a generally U-shaped radial cross section formed from inner and outer longitudinally extending legs and a radially extending transverse portion extending between said legs, wherein said seal transverse portions contact said support member;
- a pair of springs, each said spring located in the radial cross-section of said upper and lower seal;
- anda retainer contacting an outer circumference of said seals and said support member.
Dependencies are inferred from the claim text.