Fuel injection valve

Details Fuel injection valve Fuel injection valve

2011-04-19

2011-04-19

Hwu, Davis (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S585500

Reexamination Certificate

active

07926745

ABSTRACT:
A fuel injection valve includes a valve seat (11) that has a valve seat portion (11a) with a conical space defined therein and tapered toward an injection hole (11b), a needle (12) that has a valve portion (12b) formed with a curved surface for abutment with the valve seat portion (11a) and a column-shaped sliding portion (12a) located upstream of the valve seat portion (11a), and a swirler (10) that holds the sliding portion (12a) in a slidable manner, wherein fuel to be injected from the injection hole (11b) is adjusted by opening and closing a gap between the valve portion (12b) and said valve seat (11a), and assuming that a radius of curvature in an axial direction of the valve portion (12b) at a point at which the valve portion (12b) and the valve seat portion (11a) are in abutment with each other is R and an outer diameter of the sliding portion (12a) is D, R is greater than D/2.

REFERENCES:
patent: 4982716 (1991-01-01), Takeda et al.
patent: 5174505 (1992-12-01), Shen
patent: 5544816 (1996-08-01), Nally et al.
patent: 2003/0038187 (2003-02-01), Battistini et al.
patent: 56-138571 (1981-10-01), None
patent: 59-18587 (1984-04-01), None
patent: 9-072430 (1997-03-01), None
patent: 2001-107826 (2001-04-01), None
patent: 2002500308 (2002-01-01), None
patent: 2002516953 (2002-06-01), None
patent: 2003307165 (2003-10-01), None
Japanese Office Action dated Feb. 2, 2009.

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