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. 30, 1984
Filed:
Sep. 29, 1982
Gerald F Robertson, Mt. Clemens, MI (US);
Donald J Pozniak, Utica, MI (US);
Michael J McClain, Dayton, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A vacuum pump assembly which is driven by pulsating exhaust gases emanating from an internal combustion engine is disclosed. The pump assembly includes a double-acting pump means for pumping air from a vacuum source and having a reciprocable pumping member, an actuating means including a reciprocable actuating member drivingly connected to the pumping member and which is driven through first and second strokes to move the pumping member through first and second strokes, respectively, one side of the actuating member being in communication with the exhaust gases and with the actuating and pumping members being movable through their first strokes during the pressure increasing phase of each pressure pulsation and being moved through their second strokes by a first nonlinear variable rate spring means during each pressure decreasing phase of each pressure pulsation during low to intermediate engine speeds and loads and by both the first and a second nonlinear variable rate spring means during intermediate to high engine speeds and loads whereby the pump assembly is operable to pump air from the vacuum source throughout a wide range of engine speeds and loads including high speeds and loads.