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:
Feb. 16, 1988
Filed:
Oct. 16, 1986
Donald L Williams, Port Clinton, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A rocker arm in an internal combustion engine is pivotably supported by a fixed fulcrum retainer with a rocker key operatively positioned therebetween. The rocker arm and fulcrum retainer each have a concave, semi-cylindrical bearing surface and the rocker key has a pair of spaced apart, opposed convex, semi-cylindrical bearing surfaces, the concave, semi-cylindrical bearing surfaces and associate convex, semi-cylindrical bearing surfaces having radii ratios on the order of 1.7:1 to 3:1 and preferably 2:1 whereby to effect substantial rolling contact of these elements relative to each other. In addition, the rocker arm is preferably of U-shaped configuration as defined by a base with side walls depending from opposite sides thereof. A roller follower is operatively and rotatably positioned between the side walls at one end of the rocker arm, with the roller follower having an outer peripheral surface of a diameter whereby the outer peripheral surface is in rolling contact with the base and an associate element of the valve train at this end of the rocker arm. A roller support shaft is operatively associated with the side walls and with the roller follower to loosely retain the roller follower in unit assembly with the rocker arm.