Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Patent
1999-09-20
2000-11-14
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
239463, 239494, 2395851, 2395854, F02M 6100
Patent
active
061457612
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
The present invention relates to a fuel injection valve.
An electromagnetically operated fuel injection valve having multiple disc-shaped elements arranged in its seating area is already known from German Published Patent Application No. 39 43 005. Upon excitation of the magnetic circuit, a flat valve plate acting as a flat armature lifts up from a valve seat plate situated opposite and interacting with the valve plate, together forming a plate valve part. A swirl element, which sets the fuel flowing to the 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. On the lower end side of the swirl element several tangential grooves are provided which begin at the outer edge and extend all the way to a central swirl chamber. When the lower end face of the swirl element lies against the valve seat plate, the grooves become swirl channels.
In addition, a fuel injection valve is known from 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 the 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 which serves 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. On the lower end face of the swirl element several tangential grooves are provided which begin at the outer edge and extend all the way to a central swirl chamber. When the lower end face of the swirl element lies against the valve seat plate, 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 particularly easily and economically. The disc-shaped swirl element has a very simple structure, making it easy to mold. The only function performed by 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 machined 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 other 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 rim area can be produced with simple means in the swirl element according to the present invention. Grooves, ducts, notches, flutes, and channels, which are otherwise complicated to produce, can thus be advantageously eliminated in the swirl element.
Like the swirl element and the valve seat element, the guide element is also easy to produce. In an especially advantageous manner, the guide element is used only to guide the valve needle projecting through a guide opening. The guide element functions are therefore clearly separate from those of the two other downstream elements.
The modular structure and the separation of functions associated therewith have the advantage that the individual components can be designed with a great deal of flexibility, making it possible to vary different spray parameters (spray angle, static spray volume) simply by changing one element.
The swirl channels can be advanta
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Bruckner Reinhold
Buhner Martin
Eichendorf Andreas
Fischbach Dirk
Herold Stefan
Ganey Steven J.
Kashnikow Andres
Robert & Bosch GmbH
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