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. 12, 2004
Filed:
Dec. 15, 2003
Tetsuya Yoshimura, Toyota, JP;
Shuichi Matsumoto, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
A nozzle needle of a fuel injector is driven in a controlled manner by changing back pressure applied thereto. The back pressure is controlled by a pressure control valve driven by stacked piezoelectric elements. A valve body of the pressure control valve is disposed in a valve chamber having a drain port and a high pressure port which are selectively closed. A diameter D of a drain seat, a diameter D of a high pressure seat, and a diameter D of a piston portion connected to the valve body are set to satisfy a relation: D ≧D ≧D . In this manner, operation of the pressure control valve is stabilized, and thereby the fuel injector is smoothly and stably operated.