Fuel injection valve

Details Fuel injection valve Fuel injection valve

2000-06-07

2001-10-02

Moulis, Thomas N. (Department: 3747)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

Reexamination Certificate

active

06296199

ABSTRACT:

BACKGROUND INFORMATION
1. Field of the Invention
The present invention relates to a fuel injection valve.
2. Background Information
An electromagnetically operated fuel-injection valve that has multiple disc-shaped elements arranged in its seating area is described in German Patent No. 39 43 005. Upon excitation of a magnetic circuit, a flat valve plate acting as a flat armature lifts up from a valve seat plate situated opposite from and interacting with the flat valve plate. The flat valve plate and the valve seat plate together form a plate valve part. A swirl element, which sets the fuel flowing to a valve seat in a circular rotary motion, is located upstream from the valve seat plate. A stop plate limits the axial displacement of the valve plate on the side opposite the valve seat plate. The swirl element surrounds the valve plate, leaving a large amount of clearance; the swirl element thus guides the valve plate to a certain degree. At the lower end of the swirl element there are provided multiple tangential grooves, which begin at the outer circumference and extend all the way to a central swirl chamber. When the lower end of the swirl element lies against the valve seat plate, the grooves become swirl channels.
In addition, a fuel-injection valve is described in from Unexamined European Published Patent application No. 0 350 885, in which a valve seat body is provided, with a valve closing member located on an axially movable valve needle interacting with a valve seat surface of the valve seat body. A swirl element, which sets the fuel flowing to a valve seat in a circular rotary motion is located upstream from the valve seat surface in a recess in the valve seat body. A stop plate limits the axial displacement of the valve needle, with the stop plate having a central opening that is used to guide the valve needle to a certain extent. The opening in the stop plate surrounds the valve needle with a large amount of clearance because the fuel to be supplied to the valve seat must also pass through this opening. At the lower end of the swirl element there are multiple tangential grooves, which begin at the outer circumference and extend all the way to a central swirl chamber. When the lower end of the swirl element lies against the valve seat body, the grooves become swirl channels.
SUMMARY OF THE INVENTION
The fuel-injection valve according to the present invention has the advantage that it can be produced easily and economically. The injection valve can be mounted easily, and yet very precisely, especially at its downstream end. Particular advantages are obtained for finishing surfaces on a guide element and valve seat element. Because the guide element, swirl element, and valve seat element are permanently connected even prior to being mounted on the injection valve, the guide opening in the guide element, the valve seat surface in the valve seat element and a contact surface of either the guide element or the valve seat element-which, in the end, comes to rest against the valve housing, i.e. valve seat carrier-can be finished, e.g. ground, in a clamp.
In addition, the disc-shaped swirl element has a very simple structure, making it easy to form. The function of the swirl element is to produce a swirling or rotary motion in the fuel, thus preventing the formation of turbulence in the fluid, which may produce disturbances. All other valve functions are performed by other valve components. The swirl element can thus be worked to the best advantage. Because the swirl element is a single component, there are no limits to how it can be handled during the production process. Compared to swirl elements that have grooves or similar swirl-producing depressions on one end face, an inner opening area, which extends across the entire axial thickness of the swirl element and is surrounded by an outer circumferential edge area, can be produced with very simple means in the swirl element.
Like the swirl element and the valve seat element, the guide element is also easy to produce. In an advantageous manner, the guide element has an inner guide opening and is used to guide the valve needle that projects through the inner guide opening. Designing the guide element with projecting tooth-shaped areas that alternate with intermediate recesses on its outer circumference makes it possible to easily ensure optimum flow into the swirl channels in the underlying swirl element.
The modular structure of the elements and the separation of functions associated with this have the advantage that the individual components can be designed with a great deal of flexibility, making it possible to produce different spray patterns (spray angle, static spray volume) simply by varying one element. Additional spray or fastening elements can also be easily provided. Despite the variable design of the individual elements, the permanent connection between all elements makes this valve body very easy to handle.


REFERENCES:
patent: 5086979 (1992-02-01), Koblish et al.
patent: 5437413 (1995-08-01), Shen et al.
patent: 5570841 (1996-11-01), Pace et al.
patent: 5875972 (1999-03-01), Ren et al.
patent: 6039272 (2000-03-01), Ren et al.
patent: 6065692 (2000-05-01), Brinn, Jr.
patent: 39 43 005 (1990-07-01), None
patent: 197 36 682 (1999-02-01), None
patent: 0 350 885 (1990-01-01), None
patent: 99 32784 (1999-07-01), None

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