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(11) | EP 2 639 439 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE |
(57) Even when only fuel oil is injected into a cylinder liner, decrease in fuel injection
pressure, deterioration in combustibility, and degradation in performance of an internal
combustion engine are prevented, while increase in dust and black smoke is also prevented.
In a fuel injection device (1) for an internal combustion engine, capable of selectively
injecting, from a fuel injection valve (3), a mixture of fuel oil and an inert substance
in a multilayered state or in an emulsion state, or fuel oil only, a cam (10) for
lifting up a plunger (7) of a fuel injection pump (2) that pressurizes and feeds the
mixture of fuel oil and the inert substance in a multilayered state or in an emulsion
state, or the fuel oil to the fuel injection valve (3) includes: a first cam for use
in lifting up the mixture of fuel oil and the inert substance in a multilayered state
or in an emulsion state; and a second cam for use in lifting up the fuel oil only. |
{Technical Field}
{Background Art}
{Citation List}
{Patent Literature}
{PTL 1}
Japanese Examined Patent Application, Publication No. Hei 08-11945
{PTL 2}
The Publication of Japanese Patent No. 3615260
{Summary of Invention}
{Technical Problem}
{Solution to Problem}
{Advantageous Effects of Invention}
{Brief Description of Drawings}
{Fig. 1}
Fig. 1 is a schematic configuration view showing a fuel injection device for an internal
combustion engine according to a first embodiment of the present invention.
{Fig. 2}
Fig. 2 shows a graphic chart illustrating a relationship between a cam lift amount
of a cam shown in Fig. 1 and a crank angle (cam angle).
{Fig. 3}
Fig. 3 is a schematic configuration view showing a fuel injection device for an internal
combustion engine according to a second embodiment of the present invention.
{Fig. 4}
Fig. 4 is a schematic configuration view showing a fuel injection valve according
to a third embodiment of the present invention, in which a main nozzle and a sub nozzle
are closed.
{Fig. 5}
Fig. 5 is a schematic configuration view showing the fuel injection valve according
to the third embodiment of the present invention, in which a mixture of fuel oil and
water in a multilayered state or in an emulsion state is being injected.
{Fig. 6}
Fig. 6 is a schematic configuration view showing the fuel injection valve according
to the third embodiment of the present invention, in which only the fuel oil is being
injected.
{Fig. 7}
Fig. 7 is a schematic configuration view showing a fuel injection device for an internal
combustion engine according to a fourth embodiment of the present invention.
{Fig. 8}
Fig. 8 is a view explaining a function of the fuel injection device for an internal
combustion engine according to the present invention.
{Fig. 9}
Fig. 9 is a view explaining a function of the fuel injection device for an internal
combustion engine according to the present invention.
{Description of Embodiments}
(First Embodiment)
(Second Embodiment)
(Third Embodiment)
(Fourth Embodiment)
{Reference Signs List}
a first cam for use in lifting up the mixture of fuel oil and the inert substance in a multilayered state or in an emulsion state; and
a second cam for use in lifting up the fuel oil only.
main and sub nozzles; and
a needle valve that is lifted in two stages corresponding to pressure of control air to be fed, so that in a low lift state, the sub nozzle is opened to inject the fuel oil, while in a high lift state, both the main nozzle and the sub nozzle are opened to inject the mixture of fuel oil and the inert substance in a multilayered state or in an emulsion state.
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description