Patent ID: 8893681

Claim:
A valve stem seal assembly for an internal combustion engine, the engine including a housing separating a lubrication chamber and a combustion chamber, a valve guide fixed in the housing, and a valve stem extending through the valve guide and housing between the lubrication chamber and the combustion chamber, the valve stem seal assembly comprising: an annular rigid case disposed around the valve guide and the valve stem; an annular elastomeric body press fit within said annular rigid case and including a radially inwardly extending seal lip in sealing contact with the valve stem, said annular elastomeric body having a first axial end facing the valve guide and a second axial end facing away from the valve guide, said annular rigid case including a radially inwardly extending end wall opposing said second axial end of said annular elastomeric body and including a lip support extending axially from an inner portion of said radially inwardly extending end wall toward the valve guide and opposing a radially inner surface of said radially inwardly extending seal lip.