Internal-combustion engines – Combustion chamber means having fuel injection only – Combination igniting means and injector
Patent
1994-08-19
1995-08-08
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combination igniting means and injector
123304, F02B 300
Patent
active
054389666
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a fuel injection nozzle with additive injection for Diesel engines, as generically defined hereinafter. In Diesel engines, in order to vary the course of injection so as, to increase running smoothness and reduce the emission of nitrogen oxides, it is known from German Patent 925 139 to inject the fuel into the combustion chamber in two chronologically separate periods, and to inject an additive, such as water, into the combustion chamber in between the two fuel injections. The known injection nozzle for performing this method has an antechamber to partition off the preinjection quantity and a pressure chamber, into which the inlet conduit for the fuel and the inlet conduit for the additive discharge (FIG. 4), or an annular conduit that joins the additive inlet bore to the fuel inlet bore (FIG. 3). During the injection phase, a quantity of additive is forced into the pressure chamber or into the inlet bore and temporarily stored there. During the injection phase, after positive displacement and injection of the preinjection quantity, the temporarily stored quantity of additive is then injected by fuel pumped at high pressure into the combustion chamber, prior to the injection of the main injection quantity.
An essential feature is that the separation between the injection of the preinjection quantity that initiates ignition, the injection of the additive, and the injection of the main injection quantity be replicable.
ADVANTAGES OF THE INVENTION
The fuel injection nozzle according to the invention has the advantage that the requisite quantity of additive is stored in each operating stroke in the correct layering and injected at the proper time. Its structure and operation are also very simple.
Advantageous further features of the injection nozzles are possible with the provisions recited. In particular, the embodiments according to the invention enables targeted delivery and concentrated temporary storage of the additive in the intermediate chamber. Further, the invention provides for simple manufacture of the antechamber and intermediate chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is shown in the drawings and will be described in detail below. Shown are:
FIG. 1, in axial section, one half of an injection nozzle toward the combustion chamber;
FIG. 2, in axial section on a larger scale, a portion of the injection nozzle toward the combustion chamber of the nozzle body and valve needle of the injection nozzle of FIG. 1; and
FIGS. 3 and 4, a developed view of illustrate a portion of the nozzle needle of FIGS. 1 and 2, in the region of the mouth of the inlet conduit.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
A nozzle body 1 is fastened with a union nut 2, with the interposition of a shim 3, to a nozzle holder 4 (shown only partially), in which a closing spring 6 is disposed in a spring chamber 5. An inlet conduit 7 for the main fuel and an inlet conduit 8 for a liquid additive extend axially inside the nozzle holder 4, the shim 3 and the nozzle body 1. A valve needle 11 is displaceable in a longitudinal bore 9 of the nozzle body 1; it has a closing cone 12 near the end toward the combustion chamber, a pressure shoulder 13 upstream thereof, and a guide portion 14 adjoining the pressure shoulder, and the valve needle is pressed with its closing cone 12 against a conical valve seat 17 on the end of the nozzle body 1 toward the combustion chamber, by the closing spring 6 via a pressure bolt 15 and a pressure tang 16. Next, toward the combustion chamber, is a throttle bore 18, through which a throttle pintle 19 of the valve needle 11 passes. The pressure shoulder 13 of the nozzle needle 11 is surrounded by an annular pressure chamber 21 in the nozzle body 1, into which the inlet bore 7 for the main fuel discharges. Downstream of the pressure chamber, toward the valve seat 17, is an extension cylindrical segment 22 of the longitudinal bore 9, which is adjoined by a conical bore 23, whose portion near the throttle bor
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Greigg Edwin E.
Greigg Ronald E.
Nelli Raymond A.
Robert & Bosch GmbH
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