Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Reexamination Certificate
1999-08-31
2001-02-13
Kashnikow, Andres (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
C239S533120
Reexamination Certificate
active
06186418
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based upon and claims priority from Japanese Patent Application No. Hei 10-270962 filed Sep. 25, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fuel injection nozzle having a plurality of spray patterns.
2. Description of Related Art
When a fuel injection valve injects fuel into an engine having a plurality of intake valves in a combustion chamber, one type of known fuel injection nozzle has a plurality of injection holes formed on an injection hole member to form a fuel spray toward respective intake valves according to fuel injected through several groups of the plurality of injection holes, and forms several sprays as a whole. For example, a fuel injection valve disclosed in JP-A-62-261664 forms respective sprays by colliding fuel injected through grouped plural injection holes.
However, when the spray is formed by colliding fuel injected from respective injection holes, there may be a deviation among the spray diameters, and a uniform atomization may not be achieved. Furthermore, the spray direction may deviate according to a change in fuel injection pressure or a change in fuel collision angle.
It is to be noted that the spray direction has a general tendency to be variable when t/d is small and the spray atomization has a general tendency to be prevented when t/d is large, where “t” represents a thickness of the injection hole member and “d” represents a diameter of the injection hole. Accordingly, it is difficult to satisfy both these requirements, that is, stabilizing spray direction and atomization of the spray.
SUMMARY OF THE INVENTION
The present invention was made in light of the foregoing problems, and it is an object of the present invention to provide a fuel injection nozzle which realizes both stabilizing spray direction and the atomization of the spray.
According to a fuel injection nozzle of the present invention, it includes an injection hole member having a plurality of injection holes defining respective injected fuel flow path centers and a valve member provided on a fuel inlet side of the injection hole member for enabling fuel to be intermittently injected through the injection holes.
The fuel injected through the injection holes forms a spray. The injected fuel flow path centers diverge from an injection center axis as the fuel advances in an injection direction. Furthermore, the injected fuel flow path centers diverge from each other as the fuel advances in the injection direction.
Accordingly, fuel injected from respective injection holes do not collide each other. Therefore, the fuel spray is uniformly atomized.
Furthermore, fuel injected from respective injection holes attract each other by Coanda effect and advance without colliding with each other. Thus, a deviation of the spray direction is prevented, and the spray direction is stabilized.
REFERENCES:
patent: 4699323 (1987-10-01), Rush et al.
patent: 4828184 (1989-05-01), Gardner et al.
patent: 5752316 (1998-05-01), Takagi et al.
patent: 5899390 (1999-05-01), Arndt et al.
patent: 4-72456 (1992-06-01), None
Denso Corporation
Hwu Davis
Kashnikow Andres
Nixon & Vanderhye PC
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