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:
Apr. 25, 2000
Filed:
Mar. 13, 1998
David J Allen, Gladstone, MI (US);
Engineered Machined Products, Escanaba, MI (US);
Abstract
An oil pump for use in a vehicle engine includes a rotary pump for pressurizing oil to be pumped, and a movable piston cooperating with the rotary pump to facilitate metering of oil to and from the pump. The oil metering device is incorporated directly into the pump by means of a cam-actuated piston or a spring-loaded piston which cooperates with a displacement chamber for metering oil. Alternatively, a solenoid-actuated piston may be provided for selectively blocking pressurized fluid from entering a spring-loaded diaphragm chamber. The diaphragm is stroked alternatively by a spring and by oil pressure for metering of fluid therethrough in desired increments.