Fluid sprinkling – spraying – and diffusing – With solid means as guard or protector – Bumper or guard protects distributor
Patent
1991-03-19
1993-03-16
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With solid means as guard or protector
Bumper or guard protects distributor
23953312, 239601, F02M 6118
Patent
active
051937476
DESCRIPTION:
BRIEF SUMMARY
LEVEL OF TECHNOLOGICAL DEVELOPMENT
The invention is based on a protective cap for a fuel injection valve. A fuel injection valve is already known (DE-OS 35 40 660) in which a protective cap is envisaged which shows a through passage in the base, downstream of an injection opening. The protective cap should prevent damage in the area of the injection opening or a possibly provided needle seat. It is furthermore intended, by means of the protective cap, to prevent particles from a the vicinity of the nozzle of a fuel injection valve which projects into the suction pipe, from being deposited in the area of the injection opening and resulting in a narrowing of the injection opening, which leads to the amount of injected fuel being undesirably reduced, and the fuel-air mixture supplied to the internal combustion engine thus becoming too lean. However, the use of this protective cap has the effect that, after the internal combustion engine has been stopped and the fuel injection valve has been closed, the fuel located in the through passage of the protective cap, usually present in film form, will then evaporate due to the now increased heating of the engine resulting from lack of cooling. However, as a rule, only the low-boiling point constituents of the fuel will evaporate, whilst those fuel constituents which boil only at higher temperatures remain in the through passage of the protective cap, and thus, during the operating time of the fuel injection valve, after a series of stopping and starting phases of the engine, lead to detrimental deposits in the area of at least one injection opening, so that the injection behavior deteriorates and the engine tends to run rough.
ADVANTAGES OF THE INVENTION
The fuel injection valve including a protective cap which is the subject of this invention has in contrast an advantage that the protective cap not only provides contact hazard protection, but also provides that even over prolonged operation of the engine, fuel deposits due to consecutive starting and stopping phases will not cause the amount of fuel metered by the fuel injection valve being undesirably reduced, thereby ensuring correct functioning of the engine.
From the measures listed herein further advantageous developments and improvements of the fuel injection valve mentioned are possible.
Of particular advantage is the design of the protective plastic cap, which provides for ease of manufacture.
SKETCH
The drawing shows, in simplified form, two examples of the embodiment of the invention, and these are more fully explained in the following description.
The drawings show in FIG. 1, a partial cross-sectional view of one example of a fuel injection valve designed in accordance with the invention;
in FIG. 2 a partial cross-sectional view of a second example of a fuel injection valve also designed in accordance with the invention;
and in FIG. 3 a section along lines 3--3 of FIG. 2.
DESCRIPTION OF THE EMBODIMENT SHOWN
The fuel injection valve shown in partial view in FIG. 1 basically accords with a fuel injection valve, described in DE-OS 37 10 467, for a fuel injection system for a mixture-condensing, spark-ignition internal combustion engine, and serves to inject fuel into the induction manifold of the engine. A nozzle 1 is connected with a valve chamber, not shown; a valve needle 3 moves in a guide 2, into this nozzle. In the shown nozzle 1, the guide 2 terminates in a recess 5, where a conical valve seat 8 adjoins the recess in the direction of the fuel flow. A cylindrical through flow passage 10 in the nozzle 1 runs between the conical valve seat surface 8 and a nozzle front face 9. In the area of the valve seat surface 8 of nozzle 1, valve needle 3 passes into a conical sealing seat 11, which terminates in a cylindrical end portion 12. In the closed state of the fuel injection valve, the valve needle rests with its sealing seat 11 on the valve seat 8, whereas in the open state of the fuel injection valve, the sealing seat 11 is raised from the valve seat surface 8, and fuel can flow through the flow
REFERENCES:
patent: 2121948 (1938-06-01), Borland
patent: 3687375 (1972-08-01), Griffiths
patent: 4057190 (1977-11-01), Kiwior et al.
patent: 4266729 (1981-05-01), Kulke et al.
patent: 4903898 (1990-02-01), Kind
patent: 4925111 (1990-05-01), Foertsch et al.
patent: 5109824 (1992-05-01), Okamoto et al.
Grant William
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
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