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:
Jun. 26, 1986
Duane J Bonvallet, Ann Arbor, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A variable valve lift and timing valve train mechanism includes a rocker arm having one end thereof operatively engaged by a valve actuator, a reaction member having one end thereof engaging an eccentric which can be rotated to change the angular position of the reaction member; a hydraulic lash adjuster including a plunger being operatively positioned in spaced apart relationship relative to the free stem end of an associate valve and substantially coaxial therewith, the plunger having an outboard pivot end projecting toward the stem of the valve, an opposite end of the rocker arm or reaction member pivotably engaging the stem of the valve while the other end pivotably engages the outboard pivot end of the plunger. The rocker arm and the reaction member intermediate their ends having opposed working surfaces one of which is flat and the other having a predetermined cam surface profile which is adapted to cooperate with the flat working surface which when engaged is operative to effect pivotal movement of one of the rocker arm or reaction member in a valve opening direction. The point of line contact between the cam surface against the flat working surface and the geometry of the cam surface cooperate to control the amount of valve lift and its timing.