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:
Sep. 19, 2000
Filed:
Aug. 07, 1998
Mike Youakim, Milwaukee, WI (US);
George M Matta, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A fuel injector includes an injector body that defines a pressure relief passage with one end opening into a trapped volume, and a fuel pressurization chamber in fluid communication with a nozzle outlet. A needle valve member is positioned in the injector body and moveable between an inject position in which the fuel pressurization chamber is open to the nozzle outlet, and a closed position in which the nozzle outlet is blocked. The needle valve member has a closing hydraulic surface exposed to fluid pressure in the trapped volume. A pressure relief valve is positioned in the pressure relief passage, and has a valve member with an opening surface exposed to fluid pressure in the trapped volume, and a closing surface exposed to fluid pressure in the fuel pressurization chamber.