Gaseous fuel injector using liquid fuel as lubricant and...

Details Gaseous fuel injector using liquid fuel as lubricant and... Gaseous fuel injector using liquid fuel as lubricant and...

2011-02-22

2011-02-22

Tran, Len (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Injection nozzle opened by relieving supply

C239S090000, C239S088000, C239S533200, C239S533300, C239S533110, C239S585100

Reexamination Certificate

active

07891579

ABSTRACT:
A fuel injector injects high-pressure gaseous fuel directly into a cylinder of an engine. A small amount of liquid fuel is used in the injector to lubricate sliding portions of the fuel injector in addition to utilizing it as a medium for transmitting driving force. The fuel injector includes a nozzle member having injection holes at its elongated end and a needle slidably disposed in an elongated center hole of the nozzle member. The needle is driven by pressure of the liquid fuel introduced into a control chamber to open or close the injection holes. The pressure in the control chamber is controlled by a switching valve which is in turn driven by an actuator such as an electromagnetic or piezoelectric actuator. The liquid fuel is injected together with the high-pressure gaseous fuel after lubricating the sliding portions between the nozzle member and the needle.

REFERENCES:
patent: 5810328 (1998-09-01), Boehland
patent: 5833146 (1998-11-01), Hefler
patent: 6298833 (2001-10-01), Douville et al.
patent: 6811105 (2004-11-01), Kato et al.
patent: 7607636 (2009-10-01), Grandi
patent: 2006/0086825 (2006-04-01), Date et al.
patent: 2003-232234 (2003-08-01), None
patent: 2004-068762 (2004-03-01), None

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