Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – And filter – sifter or screen
Patent
1993-05-19
1994-08-23
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
And filter, sifter or screen
2395851, 239900, 25112918, 25112921, 210171, 210429, 210432, F02M 5106, F02M 5700, F02M 6120, F02M 3722
Patent
active
053400321
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an electromagnetically operated injection valve as set forth hereinafter. From the DE-OS 33 06 304, an injection valve is known, in which a fuel filter, consisting of a frame and a filter element, is arranged at the upstream end of a core flow hole which is designed to be concentric with the longitudinal axis of the valve. The filter element has a fine mesh and a supporting housing which partially encloses the mesh. The fuel filter retains fine contaminants, which would otherwise block the injection orifices in the region of a valve closing body.
Downstream from the fuel filter, a setting bushing is pressed into the flow hole of the core. At the end facing the valve closing body, the setting bushing has a contacting front face which extends at right angles to the longitudinal axis of the valve, on which a return spring is supported. The setting bush is used for setting the force of the return spring which acts on the valve closing body. The spring force is dependent on the depth to which the setting bush is pressed into the flow hole of the core.
The filtration of the fuel and the setting of the spring force are thus effected by two separate components, whereby the labour involved in mounting and the material expenditure with the resulting production costs is considerably increased. Moreover, it is not possible to alter the force of the return spring without first removing the fuel filter from the flow hole.
ADVANTAGES OF THE INVENTION
In contrast, the electromagnetically operated injection valve in accordance with the invention has the advantage that the filtration of the fuel and the setting of the spring force is effected by a single component, thereby considerably reducing the production effort relative to the prior art in a simple manner, and consequently lowering the production costs significantly. Furthermore, the force of the return spring can be set without other components of the valve having to be dismantled.
The measures listed herein facilitate advantageous developments and improvements of the injection valve specified hereinafter. A pot-shaped design of the filter element facilitates the extension of the surface through which the medium flows, opposite the flat disc-shaped filter element which is arranged across the flow direction, whereby the filter life is prolonged.
The use of nylon for the filter housing ensures high component rigidity, whereby the distortion of the housing is reduced to a minimum and the force of the return spring is kept constant.
The use of non-corroding metal for the frame of the fuel filter prevents corrosion on the surfaces of the press seat between the frame and the core.
Due to the design of an extension which is arranged on the end of the fuel filter which faces the injection orifice and which is at least partly in contact with the wall of a flow hole, the position of the fuel filter is stabilised.
DRAWING
Embodiment examples of the invention are shown simplified in the drawing and are more closely explained in the description which follows.
FIG. 1 shows a first example of a fuel injection valve designed in accordance with the invention,
FIG. 2 shows a fuel filter in accordance with the invention in an enlarged representation,
FIG. 3 shows a second embodiment example of an injection valve designed in accordance with the invention.
DESCRIPTION OF THE EMBODIMENT EXAMPLES
The injection valve, shown as an example in FIG. 1 of the drawing, for fuel injection units of a mixture compressing spark ignited internal combustion engine has a core 2 which is surrounded by the magnetic coil 1 and which is used as a fuel filler neck. The magnetic coil 1 with a coil body 3 is provided with a plastic moulding 5, which has an electrical connection plug 6 integrally moulded onto it. The coil body 3 of the magnetic coil 1 which is radially stepped carries windings 7, which are also radially stepped. A tubular metallic intermediate part 12 is connected to the lower core end 10, concentric with the valve's longitudinal axis 11 of the core
REFERENCES:
patent: 4385339 (1983-05-01), Takada et al.
patent: 4575009 (1986-03-01), Giraudi
patent: 4625919 (1986-12-01), Soma et al.
patent: 4717080 (1988-01-01), Sauer
patent: 4944486 (1990-07-01), Babitzka
patent: 4946107 (1990-08-01), Hunt
patent: 5190221 (1993-03-01), Reiter
Stegmaier Alwin
Tanski Kenneth
Greigg Edwin E.
Griegg Ronald E.
Merritt Karen B.
Robert & Bosch GmbH
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