Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-02-11
2001-07-17
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S468000
Reexamination Certificate
active
06260537
ABSTRACT:
TECHNICAL FIELD
This invention relates to engine air intake manifolds and fuel injectors and, more particularly, to intake manifolds with integrated fuel rails, their combination with side feed fuel injectors and to side feed fuel injectors for use in such manifolds.
BACKGROUND OF THE INVENTION
It is known in the art relating to engine intake manifolds to provide a manifold assembly including a manifold having a plurality of air intake passages connected with a plenum and having injector pockets connecting with the air passages. Top feed fuel injectors secured in assembly with a separate fuel rail are received in the injector pockets for selectively delivering fuel to the air intake passages to create a combustible air fuel mixture for delivery to the cylinders of an associated engine. Side mounted electrical connectors provide for connection of the injectors to an actuating electric power source.
An alternative manifold assembly provides an internal common fuel passage that acts as a fuel rail connecting with a plurality of injector pockets. Bottom feed fuel injectors are secured in the injector pockets and receive fuel from the common fuel passage through bottom feed openings. The fuel enters the bottom feed injectors between injection valve seats at the nozzle end of the injectors and an actuating coil and armature which actuate the injection valve through an axially extending rod or needle valve.
The top feed fuel injection system has provided better performance than the bottom feed system which has led to wide usage of the top feed system in spite of the additional costs associated with the separate fuel rail and additional subassembly operations involved in its manufacture.
SUMMARY OF THE INVENTION
The present invention provides an improved intake manifold and manifold assembly utilizing novel side feed fuel injectors. The fuel rail is integrated as a common part defining a common fuel passage integrated with the air intake manifold. The common fuel passage supplies the side feed fuel injectors through openings that are spaced away from the injector nozzle toward an opposite connector end of the injector. The injector concentrates the actuating coil, armature and nozzle valve in the lower or nozzle end of the injector and the fuel is fed from the side feed opening through an axially centered central fuel passage that extends through the coil and the associated armature to the injection valve in a manner identical to corresponding top feed injectors. Thus, the performance advantages of top feed fuel injection systems are provided while gaining the reduction in cost attributable to elimination of the separate fuel rail and subassembly.
These and other features and advantages of the invention will be more fully understood from the following description of certain specific embodiments of the invention taken together with the accompanying drawings.
REFERENCES:
patent: 4776313 (1988-10-01), Freismuth et al.
patent: 4966120 (1990-10-01), Itoh et al.
patent: 5058555 (1991-10-01), Haboush II et al.
patent: 5070844 (1991-12-01), Daly
patent: 5163406 (1992-11-01), Daly et al.
Lamb Curtis David
Smith Frederick
Delphi Technologies Inc.
Gimie Mahmoud
VanOphem John A.
Yuen Henry C.
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