Internal-combustion engines – Charge forming device – Auxiliary air or gas used to inject fuel
Patent
1992-01-06
1992-11-10
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Auxiliary air or gas used to inject fuel
F02M 2300
Patent
active
051615118
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on an apparatus for injecting a fuel-gas mixture as defined hereinafter. German Offenlegungsschrift 36 09 798 already discloses an apparatus for injecting a fuel-gas mixture, in which a fuel injection valve is surrounded by a stepped longitudinal bore of a valve holder. Downstream of an injection end of the fuel injection valve in the valve holder is a mixing line that communicates upstream, via a gas gap formed between the injection end and the longitudinal bore, with an annular gas conduit that communicates with a gas source. However, this apparatus has the disadvantage that the gas is delivered to the annular gas conduit through a single line and flows downstream into the mixing line through the gas gap. The danger thus exists that the fuel stream will be asymmetrically affected by the delivered gas, so that a fuel film forms on the walls of the mixing line. Accordingly, the formation of a maximally homogeneous fuel-gas mixture is not assured.
The size of the annular gas gap and the quality of centering of the fuel injection valve also depend on tolerances in the length and shape of both the fuel injection valve and the longitudinal bore of the valve holder.
ADVANTAGES OF THE INVENTION
The apparatus according to the invention has an advantage over the prior art that the fuel stream is not asymmetrically affected, because of the symmetrical delivery of the gas through the at least two opposed gap openings of the gas gap into the mixing line. Thus there is less danger that a fuel film will form on the walls of the mixing line, and the formation of a maximally homogeneous fuel-gas mixture is assured. Moreover, the apparatus has a particularly compact structure and is simple to manufacture.
By means of the characteristics recited hereinafter, advantageous further developments of and improvements to the apparatus for injecting a fuel-gas mixture as defined are possible.
For the simplest possible embodiment of the valve holder, it is advantageous if two gas gaps originate at the annular gas conduit.
It is especially advantageous if the center lines of the two gas gaps each, discharging with opposed gap openings into the mixing line, are located in a plane through the longitudinal valve axis, so that a uniform, symmetrical inflow of the gas through the gas gaps to the gap openings discharging into the mixing line takes place.
For a particularly calm and uniform inflow of the gas through the gas gaps into the mixing line, it is advantageous if the annular gas conduit is embodied at least semicircularly.
It is advantageous if the bearing face of the longitudinal bore and the injection end of the fuel injection valve are embodied to taper frustoconically, radially to the longitudinal valve axis, so that the position of the injection end to the mixing line is defined in a simple manner immediately at the injection end itself. This assures accurate embodiment of the gas gaps, central injection of the fuel, and hence the formation of a maximally homogeneous fuel-gas mixture. Additionally, the gas gaps are inclined relative to the longitudinal valve axis in the downstream direction, so that any fuel deposited on the wall of the mixing line is torn off and entrained at high speed by the gas flowing downstream.
It is also advantageous if branching off from the mixing line is a regulator gap that is formed between the injection end and the bearing face of the valve holder and which communicates with a pressure regulator, so that the measurement of the pressure takes place as close as possible to the injection end of the fuel injection valve. This is necessary because the pressure regulator regulates the fuel pressure, or the pressure of the delivered gas as well, relative to the injection location.
DRAWING
An exemplary embodiment of the invention is shown in simplified form in the drawing and described in further detail in the ensuing description. Shown are FIG. 1, a partial cross sectional view of the exemplary embodiment with a fuel injection valve and a valve
REFERENCES:
patent: 4434766 (1984-03-01), Matsuoka et al.
patent: 4945877 (1990-08-01), Ziegler et al.
patent: 4982716 (1991-01-01), Takada et al.
patent: 5027778 (1991-07-01), Noki et al.
patent: 5080079 (1992-01-01), Yoshida et al.
patent: 5102054 (1992-04-01), Halvorsen
Greigg Edwin E.
Greigg Ronald E.
Nelli Raymond A.
Robert & Bosch GmbH
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