Patent ID: 6394463
Filing Date: 2002-05-28
Classification: F01L,F16J

Abstract:
A valve stem seal adapted for use in a combustion engine, the combustion engine having a valve stem guide and a valve stem, the valve stem guide having a bore, the valve stem reciprocally disposed in the bore, the valve stem having one end extending toward an oil chamber and the other end extending toward a combustion chamber, said valve stem seal comprising:a rigid annular support member; an annular elastomeric body adjacent said rigid annular support member, said annular body having an interior section, said interior section having three lips which sealingly engage the valve stem including; a first lip; a second lip adjacent to said first lip; said second lip having a plurality of first notches on the circumferential inner portion of said second lip and a non-notched portion adjacent to one of said plurality of first notches; and a third lip adjacent to said second seal, said third lip having a plurality of second notches on the circumferential portion of said third lip and a second non-notched portion, said first notch in flow communication with the oil chamber and said second notch in flow communication with said first notch, said first plurality of notches are circumferentially shifted relative to said second plurality of notches in order to prevent said first notch and said second notch from being in an axially aligned condition.