Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Patent
1999-02-12
2000-12-05
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
239453, 2395337, 2395339, 239584, 239590, F02M 6100
Patent
active
061554995
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an injection valve, in particular for direct injection of fuel into a combustion.
BACKGROUND INFORMATION
International Patent Publication No. WO 93/23172 describes a conventional injection valve for direct injection of fuel into the combustion chamber of an internal combustion engine includes a valve body arranged in a housing and having a valve opening which is surrounded by a valve seat arranged on the spray side and through which there extends a valve needle carrying a closing head so that the closing head is in contact with the valve seat from the outside when the valve is closed.
When the valve needle moves out of its closed position against the force of a closing spring into the spraying direction in order to spray fuel, the closing head is lifted up from the valve seat, forming an annular spray opening between the closing head and the valve seat. The cross section of the spray opening is the narrowest cross section of the flow path, determining the flow rate, through the valve and is determined by the opening stroke of the valve needle.
The opening stroke of the valve needle is determined by an actuating device acting on the valve needle, or if there are alignment errors, by a spring sleeve attached to the valve needle coming to rest against a valve needle guide body. Due to manufacturing tolerances, it is therefore difficult to accurately set the desired cross section of the spray opening. Furthermore, in prolonged operation of the known an injection valve, changes may occur in the cross section of the spray opening, because the means for limiting the stroke, as well as the valve seat and the sealing surface connected thereto, are subject to wear.
U.S. Patent No. 5,307,997 describes another conventional injection valve which includes a valve seat body with a valve opening serving as a spray opening and a valve needle guide body with as guide bore for the valve needle. A sealing surface provided on the valve needle is connected to a valve seat surrounding the valve opening on the side facing away from the spray area. Upstream of the spray opening there is a frusto-conical swirl chamber bordered by a recess in the valve seat body and a projection on the valve needle guide body.
Fuel is supplied to the swirl chamber through bore holes in the valve needle guide body which form fuel channels. Each individual bore hole has a bore section with a reduced diameter toward the outlet end. These bore sections together form the narrowest cross section in the flow path through the injection valve required for fuel metering. Because of the swirl chamber downstream from the fuel channels, fuel with this conventional injection valve is sprayed in the form of a uniform, continuous frusto-conical layer of fuel.
SUMMARY OF THE INVENTION
An exemplary embodiment of an injection valve according to the present invention has the advantage over the related art that the fuel channels which determine the narrowest flow cross section are protected from soiling, while on the other hand a stranded layer of fuel can be sprayed. The frusto-conical layer of fuel in particular thus has a fuel distribution that varies in the peripheral direction. It is therefore possible through a suitable design and arrangement of the fuel channels to optimize the fuel distribution in the fuel layer for the respective combustion chamber, so that a contiguous mist of fuel-air mix with a combustible fuel-to-air ratio can be produced.
Taking into account the built-in rotational position of the injection valve, the mutual arrangement of the spark plug and injection valve and the orientation of the injection valve with respect to the axis of the combustion chamber, it is thus possible achieve such results as no liquid fuel being deposited on the wall of the combustion chamber or on the piston bottom, the spark plug not cooling off too much due to being sprayed with fuel while a stoichiometric fuel-air mixture is present at the spark plug.
German Unexamined Patent Application No. 38 20 509 des
REFERENCES:
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patent: 2656218 (1953-10-01), Campbell
patent: 4350301 (1982-09-01), Erwin et al.
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patent: 4651931 (1987-03-01), Hans et al.
patent: 5048497 (1991-09-01), Kishida et al.
patent: 5307997 (1994-05-01), Wakeman
patent: 5878961 (1999-03-01), Mueller et al.
Muller Martin
Preussner Christian
Rembold Helmut
Ganey Steven J.
Kashnikow Andres
Robert & Bosch GmbH
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