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. 25, 1986
Filed:
Aug. 20, 1984
John I Deckard, Grand Rapids, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An electromagnetic unit fuel injector for use in a multi-cylinder diesel engine has an externally actuated pump for intensifying the pressure of fuel delivered to a pressure actuated injection valve controlling flow discharge out through a spray outlet and which is normally biased to a closed position by a spring. Pressurized fuel from the pump is also supplied via a throttling orifice to a modulated pressure servo control chamber having a servo piston means operatively associated with the injection valve. A drain passage extends from the servo control chamber with flow therethrough controlled by a solenoid actuated control valve in the form of a poppet valve which is normally biased to a closed position by a valve return spring of predetermined force whereby the control valve is also operative as a pressure relief valve and preferably, a secondary pressure relief valve means is also incorporated into the unit injector so that all of the unit injectors for the engine will operate at a uniform maximum peak pressure.