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:
Oct. 12, 1993
Filed:
Feb. 28, 1991
Paul R Meernik, Redford, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
The oil control ring for a piston has a single low tension rail and a contiguous blocker ring, under light tension, to prevent oil flow through the rail end gap. A separate spring applies tension to the rail. A serpentine spring in conic form presses outwardly on the rail and presses inwardly on a restraining ring. A separator ring behind the blocker ring allows oil flow to a drainage vent to help keep the region behind the blocker ring dry. A dike behind the blocker ring in the form of a closed ring or a recess formed in the groove collects oil thrown upwardly on the upper half of the piston cycle to prevent oil leakage through the upper axial clearance or the blocker ring end gap.