Internal-combustion engines – Combustion chamber means having fuel injection only – Combination igniting means and injector
Patent
1984-10-19
1986-08-05
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combination igniting means and injector
123298, 123543, 123145A, 361264, 219267, F23Q 700
Patent
active
046036679
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a device for fuel injection in accordance with the type of the main claim. One single heat layer is provided in the incandescent wire in a known device of this type. This is disadvantageous in that the temperature of the heat layer changes with the thermic pulsation of the passing medium. In order to prevent this, the heat layer must be overdimensioned so that an energy loss occurs.
Due to the high heat capacity of the ceramic heat protection layer of the incandescent wire and its structure, the hitherto known devices require a relative long time interval for reaching the required end temperature for igniting or preliminary heating of the fuel-air mixture.
ADVANTAGES OF THE INVENTION
The device with the characterizing features of the main claim in accordance with the invention is advantageous in that the required temperature for preheating is reached at a relative short time. The inner heat layer can practically heat up into the ceramic protective layer without any heat transfer. The simultaneously heated second heat layer takes over the heating of the ceramic protection layer and assures a high and relative constant heat capacity of the protection layer. Therefore, thermic pulsations of the fuel-air mixture cause only very minute temperature changes of the heat layer. At the location of the flowing mixtures the device has a high and relative constant energy density. Simultaneously, the second heat layer prevents a thermic overloading of the inner heat layer.
Advantageous further embodiments and improvements of the features stated in the main claim are possible with the measures stated in the subclaims.
The inner heating layer is advantageously mechanically stabilized by means of the manufacturing method. An evaporation of the platinum is prevented in the heat layers consisting, for example, of different platinum alloys, so that a long time change of the heat layer resistance is prevented. Threby, the device has an excellent life span and permits an economical manufacturing by means of modern manufacturing processes.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings, disclosing an illustrative embodiment of the present invention, and which serve to present the various objectives and advantages hereof, are as follows:
FIG. 1 is a partially sectioned side view of a part of an injection nozzle at the side of the combustion chamber in accordance with one exemplified embodiment;
FIG. 2 is a view showing longitudinal section through an exemplified embodiment of the incandescent wire in a schematic illustration;
FIG. 3 is a view showing a modification of the exemplified embodiment in accordance with FIG. 2;
FIGS. 4-6 are views schematically showing process steps for making the exemplified embodiment in accordance with FIG. 2, wherein in FIG. 4 a heating layer is wound on a mandrel, in FIG. 5 an electrically insulating layer is applied on the heating layer, and in FIG. 6 a second heating layer is then applied;
FIG. 7 is a view showing a support element for a heating coil from the exemplified embodiment in accordance with FIG. 2;
FIG. 8 is a view schematically showing a manufacturing process for the support element of FIG. 7;
FIG. 9 is a view showing another support element for heating coil from the exemplified embodiment in accordance with FIG. 2; and
FIG. 10 is a view schematically showing a manufacturing process for the support element in accordance with FIG. 9.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENTS
The injection nozzle 10 in accordance with FIG. 1 has a jet body 11 which is clamped on a jet holder 14 by means of a screw cap 12. Parts 11 to 14 are commercially available and are therefore not shown in detail and also not described. The injection nozzle 10 is designed as a throttle pin jet nozzle, whose valve needle supports a throttle pin 16 extending from the jet body 11. The lines 18 indicate a jet cone of the fuel jet stream. Instead of a throttle pin nozzle one could provide an apertured nozzle.
A relatively thin walled tube like incandescent wire 20 is m
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Grunwald Werner
Imhof Ernst
Komaroff Iwan
Schmid Gunther
Schmid Kurt
Nelli Raymond A.
Robert & Bosch GmbH
Striker Michael J.
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