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. 08, 2014
Filed:
Nov. 07, 2011
Sana Mahmood, Peoria, IL (US);
Zhenyu LI, Peoria, IL (US);
Michael Curtis Herr, Peoria, IL (US);
Gregory William Hefler, Chillicothe, IL (US);
Linda Angharad Williams, Dunlap, IL (US);
Sana Mahmood, Peoria, IL (US);
Zhenyu Li, Peoria, IL (US);
Michael Curtis Herr, Peoria, IL (US);
Gregory William Hefler, Chillicothe, IL (US);
Linda Angharad Williams, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A common rail fuel injector includes a needle valve member that moves to open and close nozzle outlets for a fuel injection event responsive to pressure in a needle control chamber. Between injection events, the needle control chamber is fluidly connected to the fuel inlet by a first pathway that includes a Z orifice, and fluidly connected to the fuel inlet by a second pathway that includes an F orifice, an intermediate chamber and an A orifice. During an injection event, the needle control chamber is fluidly connected to a drain outlet by a third pathway that includes the A orifice, the intermediate chamber an E orifice and a buffer chamber, which may assist in avoiding cavitation erosion in a sensitive area associated with a flat control valve seat. Different performance characteristics are achieved by adjusting the sizes of the respective of F, A, Z and E orifices.