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. 10, 1989
Filed:
Feb. 23, 1988
Vemulapalli Durga Rao, Bloomfield Township, Oakland County, MI (US);
Wallace R Wade, Farmington Hills, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
An oilless engine having a piston reciprocal within a cylinder and along an axis of such cylinder while providing an annular gap therebetween to receive combustion gases and a gas phase blow-by control system for such engine. The system comprises (a) an annular receptacle in at least one of said piston and cylinder; (b) an annular body of graphite carrying high temperature solid lubricant disposed in said annular receptacle, said body presenting a face projecting out of said receptacle; (c) an elastomer material retentive of elasticity at the maximum operating temperature to be experienced by said body, interposed between said body and receptacle to urge said body to close said gap under all operating conditions of said engine; and (d) axially directed grooves in said body face sized to substantially trap cylinders of combustion gases therein by viscosity under low pressure gradients and to limit the passage of a combustion gases through said grooves under high pressure gradients to one percent or less of the cylinder gas charge volume, the gas cylinders functioning as bearings to ride the piston during reciprocation.