Fuel injection valve for internal combustion engines

Details Fuel injection valve for internal combustion engines Fuel injection valve for internal combustion engines

1996-10-02

1999-01-26

Weldon, Kevin

Fluid sprinkling, spraying, and diffusing

Distributor having thermal expansion joint, differentially...

2395854, 239900, B05B 1500, F02M 6118

Patent

active

058629912

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a fuel injection valve for internal combustion engines. A fuel injection valve is already known (German patent disclosure DE 42 21 185 A1) in which at very high engine and fuel temperatures a reduction in the injected fuel quantity (leaning down) occurs, especially on hot starting and during hot idling. This is because the valve housing, the valve seat body and the injection port disk heats up severely, causing vapor bubble development at the injection ports of the injection port disk, which leads to a two-phase flow of liquid fuel and vapor bubbles, with a decreasing fuel quantity per unit of time, through the injection ports. This undesirably affects the running performance of the engine in such a way that nonconcentric engine operation occurs, or the engine even stalls.


ADVANTAGES OF THE INVENTION

The fuel injection valve of the invention, has the advantage over the prior art that especially at very high engine or fuel temperatures the danger of a reduction (leaning down) in the injected fuel quantity is lessened or even avoided entirely in a simple way, so that the running performance of the hot engine is improved, especially in hot starting or hot idling. The at least one transfer element between the valve seat body and the injection port disk lessens the heat transfer from the valve seat body to the injection port disk, or in other words decouples them from one another, so that the heat of evaporation, which is required for evaporating the fuel injected through the injection ports and is drawn from the injection port disk, leads to cooling down of the injection port disk, while a replenishing flow of heat from the valve seat body to the injection port disk is reduced or nearly entirely suppressed by the transfer element. Because the injection port disk is cooler than in known fuel injection valves, vapor bubble development upstream of the injection port disk or at the injection ports is greatly reduced or avoided entirely, and thus especially in hot starting the engine is adequately supplied with fuel for reliable starting and continued operation.
It is advantageous to embody the at least one transfer element as a raised shoulder on the valve seat body, making it possible to reduce the area of contact between the valve seat body and the injection port disk and thereby to create a throttle restriction for the heat transfer.
It is also advantageous to embody the at least one transfer element as a raised shoulder on the injection port disk, as a result of which once again the area of contact between the valve seat body and the injection port disk is reduced and the heat transfer is thus throttled. It is also advantageous to form the disk shoulder by means of an indented step or inward bulge in the injection port disk. Another advantageous feature is such that at least one transfer element is embodied as a raised shoulder on the valve seat body, and at least one transfer element is embodied as a raised shoulder on the injection port disk, to throttle the heat transfer between the valve seat body and the injection port disk. It is additionally advantageous to embody the body shoulder and the disk shoulder in circular-annular form.
It is also advantageous to press the injection port disk against the body shoulder and join them to one another, or to press the injection port disk with the disk shoulder against the valve seat body and join them together.
A likewise advantageous embodiment comprises embodying the at least one transfer element as a separate, thermally insulating insulator body, and disposing it between the valve seat body and the injection port disk, so as to reduce the amount of heat transferred from the valve seat body to the injection port disk. It is advantageous to make the injection port disk out of plastic, especially in the form of an injection-molded plastic body.


BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the invention are shown in simplified form in the drawing and described in further detail in the ensuing description. FIG.

REFERENCES:
patent: 4502196 (1985-03-01), Kupper et al.
patent: 4957241 (1990-09-01), Roger
patent: 5295627 (1994-03-01), Wahba

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