Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-01-02
1992-09-01
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123456, 123468, F02M 5502
Patent
active
051430398
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention starts from a fuel distributor for fuel injection systems of internal combustion engines of the generic type defined herein.
Such a fuel distributor is described, for example, in DE 37 30 571 A1. By virtue of the fuel-filled annular space surrounding the fuel injection valves, the latter are directly surrounded by fuel and are thereby cooled. The cooling of the fuel injection valves reduces their heat load and thereby improves overall the hot-starting performance of the internal combustion engine.
However, the tangential flow against the fuel injection valves does not allow the full utilization of the cooling capacity of the fuel since complete flow around the fuel injection valves is not achieved
ADVANTAGES OF THE INVENTION
The fuel distributor according to the invention has the advantage that, by virtue of the flow restrictor, assigned to each fuel injection valve, in the fuel line, flow around the fuel injection valves by almost 360.degree. is enforced. The valve housing is thus washed more intenvisely (sic) with fuel over a larger housing area and the cooling effect is thus improved. The improved cooling leads to a lower temperature level in the fuel injection valves during the operating phase of the internal combustion engine, with the result that the maximum temperature in the fuel injection valves which is reached in the shut-off phase of the internal combustion engine is already lower. Due to this lower temperature level, the formation of bubbles in the fuel during the shut-off phase of the internal combustion engine is less. When the internal combustion engine is started in this hot shut-off phase (hot starting), the valve housing is rapidly and intensively cooled on the entire surface and fresh, cool fuel is fed to the valve space. The vapour bubbles in the fuel condense and are in part carried along, with the result that the hot-starting performance of the internal combustion engine is considerably improved.
Advantageous further developments and improvements of the fuel distributor herein are possible by means of the measures presented.
DRAWING
The invention is explained in greater detail in the following description by means of an illustrative embodiment depicted in the drawing, in which:
FIG. 1 shows a side view of a fuel distributor for a fuel injection system of a four-cylinder internal combustion engine,
FIG. 2 shows a section along the line II--II in FIG. 1 and
FIG. 3 shows a section along the line III--III in FIG. 1 in enlarged representation.
DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT
The fuel distributor, to be seen in side view in FIG. 1 and in different sectional representations in FIGS. 2 and 3, for a fuel injection system of a four-cylinder internal combustion engine serves for the holding, fuel supply and electrical contacting of four electromagnetically actuated fuel injection valves 10. It has an elongate distributor housing 11 which has four location holes 12 made at axial intervals and two coaxial fuel lines, of which the fuel line of larger diameter serves as a feed line 13 for feeding fuel to the fuel injection valves 10 and the fuel line of smaller diameter extending inside the feed line 13 serves as return line 14 for returning fuel to a fuel tank (not shown). Feed line 13 and return line 14 are connected to one another via a pressure control valve 15 and each connected by their free end to a connecting branch 16 and 17 respectively. The direction of flow of the fuel is denoted by arrows at the connecting branches 16, 17.
The feed line 13 is led tangentially past the location holes 12 and communicates with the location holes 12 via openings 18 penetrating the hole wall and line wall. Inserted fluid-tightly into each location hole 12 is a fuel injection valve 10, this being accomplished by means of two 0 rings 19, 20 (FIG. 3). The valve housing 21, of stepped design, is here supported by an annular flange 22 against an annular shoulder 23 coaxially surrounding the location hole 12 and protrudes from the location hole 12 with an outlet nozzle
REFERENCES:
patent: 3481365 (1969-12-01), Keen
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patent: 4395988 (1983-08-01), Knapp
patent: 4601275 (1986-07-01), Weinand
patent: 4609009 (1986-09-01), Tisone
patent: 4751904 (1988-06-01), Hudson
patent: 4922958 (1990-05-01), Lemp
patent: 4955409 (1990-09-01), Tokuda
Greigg Edwin E.
Griegg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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