Title:
制御弁および燃料噴射弁
Document Type and Number:
Japanese Patent JP4019934
Kind Code:
B2
Abstract:
A nozzle needle (3) of a fuel injector (10) is driven in a controlled manner by changing back pressure applied thereto. The back pressure is controlled by a pressure control valve (102) driven by stacked piezoelectric elements (51). A valve body (11) of the pressure control valve is disposed in a valve chamber (21) having a drain port (22) and a high pressure port (23) which are selectively closed. A diameter D1 of a drain seat (14), a diameter D2 of a high pressure seat (15), and a diameter D3 of a piston portion (12) connected to the valve body are set to satisfy a relation: D1 ≥ D2 ≥ D3. In this manner, operation of the pressure control valve is stabilized, and thereby the fuel injector is smoothly and stably operated.
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Inventors:
Tetsuya Yoshimura
Shuichi Matsumoto
Shuichi Matsumoto
Application Number:
JP2002377259A
Publication Date:
December 12, 2007
Filing Date:
December 26, 2002
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F02M51/06; F02M47/00; F02M61/16; F02M51/00; F02M59/46; F02M61/20; F16K17/04; F02M55/00; F02M63/00
Domestic Patent References:
| JP2002531769A | ||||
| JP2001090634A | ||||
| JP61010174A | ||||
| JP4082461U | ||||
| JP2000512360A |
Attorney, Agent or Firm:
Hirohiko Usui
Takashi Ito
Takashi Ito