JPS6027827Y2 - diesel engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diesel engine that improves the mixing of fuel spray and air in the fuel chamber.

Conventionally, diesel engines have a structure that actively injects gas separately from the fuel injection nozzle in order to improve combustion, but in both cases, the gas ejected into the combustion chamber causes a swirling motion and is converted into fuel. The idea is to contact and mix with air through swirling motion.

This conventional technical idea has some effects, but the present invention does not give a swirling motion like the conventional one, but instead sprays a jet of gas directly onto the injected fuel. The atomization of fuel and its mixing with air have been further improved to achieve good combustion.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a cylinder head of an engine, 2 is a fuel injection nozzle, and 3 is a fuel injection hole portion thereof.

The present invention is characterized by providing gas injection holes approximately parallel to the axis of the fuel injection nozzle 2 around the upper part of the fuel injection hole portion 3.

To provide this gas injection hole, as shown in FIGS. 1 and 2, an annular gas injection hole is inserted into a cylindrical nozzle holder 4 that is fitted into the cylinder head 1 and holds the fuel injection nozzle 2. A chamber 5 is provided, and gas injection holes 6 communicating with the gas chamber 5 and the inside of the cylinder are provided above and around the fuel injection hole portion 3.

Furthermore, as another embodiment, as shown in FIG.
A may be provided, and a gas injection hole 6a communicating between the gas chamber 5a and the inside of the cylinder may be opened above and around the fuel injection hole portion 3.

In the gas chambers 5, 5a in any of the above embodiments,
It is connected to a gas supply device via a conduit 7 and a check valve 8.

The body feeding device and other related mechanisms will be explained with reference to FIG.

Reference numeral 9 denotes a fuel injection nozzle, which is connected to the fuel injection nozzle 2.

10 is a near compressor, and 11 is an air tank.

This air tank 11 is connected to the gas chambers 5 and 5a through a conduit 7, and in addition to the check valve 8, a control valve 12 is connected to the conduit 7.
is provided.

This control valve 12 is opened and closed by an actuator 13 that operates based on commands from a controller 15.

Further, the commands from the controller 15 control the opening degree, opening/closing period, etc. of the control valve 12 by inputting various conditions from the detection device 14 such as engine speed, temperature, and load.

Therefore, since the present invention has the structure as described above, the gas chamber 5
, 5a is injected as a jet stream from the gas injection pores 6, 6a, for example, from the latter half of the compression stroke to the latter half of the explosion stroke.

Therefore, gas is injected into the combustion chamber before fuel injection, and a vortex or turbulent flow of gas is generated in the combustion chamber, and when fuel is injected from the fuel injection hole 3, the gas is injected from the gas injection pores 6, 6a above it. The injected fuel is directly pushed by the jet stream, atomizing and dispersing the injected fuel, and at the same time promoting mixing with air.

Therefore, the atomization of the injected fuel and the mixing effect with the air are further increased compared to the conventional structure in which the high-pressure air ejected from the gas nozzle generates a swirling motion within the combustion chamber from the beginning, and the advantage is that even better combustion can be obtained. There is.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main part of the present invention, FIG. 2 is a perspective view of the nozzle tip, and FIG. 3 is a sectional view showing another embodiment of the present invention.
FIG. 4 is a configuration and control circuit diagram of the gas supply device. 1... Cylinder head, 2... Fuel injection nozzle, 3... Fuel injection hole portion, 4...
Nozzle holder, 5... Gas chamber, 6...
Gas injection pore, 8...stop valve.

Claims (1)

[Scope of utility model registration request] A gas injection hole approximately parallel to the axis of the fuel injection nozzle is provided around the upper part of the fuel injection hole of the fuel injection nozzle, and a control valve and a check valve are provided in a conduit that supplies gas from a gas pressure source to the gas injection hole. A diesel engine, characterized in that the control valve is equipped with a controller and an actuator that open the control valve only during a period from just before fuel injection in the latter half of the compression stroke of the engine to the latter half of the explosion stroke.