Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Reexamination Certificate
2000-12-21
2002-05-07
Evans, Robin O. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
C239S533200, C239S533120, C239S585200, C239S585300, C239S585400, C239S585500, C239S461000, C239S463000, C239S584000
Reexamination Certificate
active
06382533
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a fuel injector.
BACKGROUND OF THE INVENTION
From German published Patent Application No. 197 57 299, a fuel injector is described in which a fuel injection chamber is arranged downstream of a valve seat. For opening and closing the valve, an axially movable valve needle cooperates with the valve seat, the needle having a conical closing segment corresponding to the contour of the valve seat. Upstream of the valve seat, on the exterior periphery of the valve needle, a diagonally running swirl channel is provided. The swirl channel empties into an annular swirl chamber, which is formed between the valve needle and an external valve housing. From this swirl chamber, the fuel is conveyed to the valve seat. From the fuel injection chamber downstream of the valve seat, the fuel flows into an outlet opening, which begins slightly offset from the center of the base surface of the fuel injection chamber and runs downstream diagonally with respect to the valve longitudinal axis.
SUMMARY OF THE INVENTION
The fuel injector according to the present invention, has the advantage that in a particularly simple manner, a cost-efficient compensation is achieved for the unequal distribution of fuel in the spray to be spray-discharged arising in response to a chosen inclination of an outlet opening, towards the goal of an equal distribution of a spray that is diagonally spray-discharged. Using the fuel injector according to the present invention, very good atomization and very precise spray discharging of the fuel are achieved, e.g., directly into a cylinder of an internal combustion engine. A particularly uniform front of the spray-discharged spray is attained. In addition, it is avoided that individual streams in the spray have great speed and depth of penetration.
It is advantageous to achieve the above-mentioned compensation of the irregularity of the spray using an outlet opening, the central point of whose intake plane lies on the valve longitudinal axis, the intake plane thus having a central intake. In this manner, however, in response to the preselected small diameter of the valve seat in the area of its seat contact line, in order to avoid large hydraulic forces being exerted on the valve needle, relatively large diameters can be selected for the outlet opening, permitting a large flow of fuel. In comparison with the off-center solutions, flow-through dispersions can be better avoided.
In a particularly advantageous manner, swirling fuel is fed to the valve seat in the valve seat element over an extremely short flow route. This very short flow route is also guaranteed to the extent that the outlet opening begins immediately at the end of the valve seat surface, avoiding any collector spaces.
The disk-shaped swirl element has a very simple structure and can therefore be shaped in a simple manner. It is the task of the swirl element to generate a swirl or rotary motion in the fuel. Since the swirl element is an individual structural element, its handling in the manufacturing process should not give rise to any limitations.
In comparison to swirl bodies, which have grooves or similar swirl-generating indentations on an end face, it is possible, using the simplest of means, to create in the swirl element an interior opening area, which extends over the entire axial thickness of the swirl element and is surrounded by an exterior circumferential edge area.
REFERENCES:
patent: 4254915 (1981-03-01), Müller
patent: 4595144 (1986-06-01), Wiegand et al.
patent: 5875972 (1999-03-01), Ren et al.
patent: 5878962 (1999-03-01), Shen et al.
patent: 22 32 686 (1974-01-01), None
patent: 28 41 967 (1980-04-01), None
patent: 40 35 317 (1991-10-01), None
patent: 197 57 299 (1998-06-01), None
patent: 0 909 920 (1999-04-01), None
patent: 62-48958 (1987-03-01), None
patent: 07 119 584 (1995-05-01), None
patent: 2000297727 (2000-10-01), None
Buehner Martin
Dallmann Frank
Hoang Anh Tuan
Keim Norbert
Land Peter
Evans Robin O.
Robert & Bosch GmbH
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