The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2003
Filed:
Jan. 31, 2002
Mark Alan Leimer, Fort Wayne, IN (US);
Dana Corporation, Toledo, OH (US);
Abstract
A valve stem seal assembly includes a retainer with an elastomeric seal body bonded to the interior of the retainer. The seal body includes first and second annular sealing members that engage a valve stem and valve guide, respectively. The seal body also includes a third annular sealing member that protrudes slightly below a bottom surface of a lower flanged portion of the retainer, adapted to engage a cylinder head. Poor machining of the valve guide, and or the cylinder head, often creates a leak path for oil to flow beneath the seal, and through openings between valve guide and cylinder head. The third annular sealing member seals the leak path. The elastomeric seal body also includes axially disposed ribs near the bottom of the retainer with window-like exposed metal spacer areas between ribs, which lowers cost of the seal assembly through reduced amount of elastomeric material required for manufacture.