JPS5911726B2 - Combustion methods in internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion method in an internal combustion engine.

The object of the present invention is to introduce a part of the homogeneous air-fuel mixture in the main combustion chamber of an internal combustion engine into the pre-combustion chamber, compress this air-fuel mixture independently in the pre-combustion chamber and ignite it, and transfer the combustion gas into the main combustion chamber. The purpose is to provide an ignition source for the remaining air-fuel mixture, thereby making the combustion of the internal combustion engine smooth and complete.

The present invention will be described below with reference to embodiments shown in the drawings.

The combustion method in an internal combustion engine according to the present invention is characterized by using a homogeneous mixture of fuel and air.

The internal combustion engine shown in the drawing is intended for carrying out the method of the invention and consists of a main combustion chamber 3 formed by a cylinder 1 and a piston 2 and a precombustion chamber 6 formed by an auxiliary cylinder 4 and an auxiliary piston 5. The two chambers 3 and 6 are communicated with each other by a fuel supply passage 1 and a combustion gas injection passage 8, and a check valve 9 is disposed in the passage 8.

The auxiliary piston 5 moves up and down within the auxiliary cylinder 4 following a cam 10 disposed on its head, and in order to match the timing with the up and down movement of the main piston 2, a crankshaft 11 and a camshaft 12 are connected. A coil spring 1 is connected between the spring receiver 13 fitted and fixed inside the auxiliary cylinder 4 and the spring receiver 14 disposed above the auxiliary piston.
Among the passages 7 and 8 which are attached with the auxiliary piston 5 and urge the auxiliary piston 5 upward, the fuel supply passage 7 has its inlet 16 connected to the upper part of the main combustion chamber 3, and its outlet 11 connected to the upper part of the pre-combustion chamber 6. The combustion gas injection passage 8 has its inlet 18 located at the lower part of the pre-combustion chamber 6, and its outlet 19 located at the upper center of the main combustion chamber 3.

The check valve 9 has a spring 20 disposed between the valve and the auxiliary cylinder 4 to push the valve body 21 into the valve seat 2 on the housing side.
2, which normally closes the passage 8, and opens the passage 8 only when the pressure in the pre-combustion chamber 6 becomes extremely large compared to the pressure in the main combustion chamber 3. .

The combustion method for an internal combustion engine according to the present invention will be explained with reference to FIGS.

FIG. 2I shows the beginning of compression of the homogeneous air-fuel mixture drawn into the main combustion chamber.

FIG. 2 (2) shows the compression process, and in this state the auxiliary piston 5 is still located at the top of the auxiliary cylinder 4.

Thereafter, the auxiliary piston 5 begins to descend, closes the outlet 1T of the fuel supply passage T, continues its descent, and compresses the air-fuel mixture in the pre-combustion chamber 6 to at least the pressure in the main combustion chamber.

In this way, when the auxiliary piston 5 is located near the bottom of the auxiliary cylinder 4, the compressed air-fuel mixture is ignited, and its explosive force opens the check valve 9 and directs the combustion gas into the main combustion chamber.
to squirt.

Figure 2 (■) shows the state in which the air-fuel mixture in the main combustion chamber 3 is combusted by the combustion gas ejected from the pre-combustion chamber 6.
The auxiliary piston 5 is located at the lowest part of the auxiliary cylinder 4 until the air-fuel mixture starts to be sucked into the main combustion chamber 3 again.

The combustion method in the internal combustion engine according to the present invention is to compress and combust a homogeneous air-fuel mixture introduced from the main combustion chamber into the pre-combustion chamber, and then burn the resulting combustion gas as an ignition source for the air-fuel mixture in the main combustion chamber. Because of this, combustion is smooth, and a fairly dilute mixture of gasoline or diesel oil is sufficient, and since it burns completely, it is extremely effective in suppressing harmful exhaust gases.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the main parts of a device for carrying out the combustion method in an internal combustion engine according to the present invention, and Fig. 2 1 to 2 are conceptual longitudinal sectional views showing its compression and combustion strokes. It is a diagram. 3... Main combustion chamber, 4... Auxiliary cylinder, 5... Auxiliary piston, 6... Pre-combustion chamber, 7... Fuel Supply passage, 8...
Combustion gas injection passage, 9...Check valve.

Claims (1)

[Claims] 1 In an internal combustion engine, a pre-combustion chamber is provided that communicates with the main combustion chamber, and the homogeneous air-fuel mixture that is sucked into the main combustion chamber and further flows into the pre-combustion chamber is independently compressed in the pre-combustion chamber and combusted there. A combustion method in which combustion gas in the pre-combustion chamber is injected into the main combustion chamber by the combustion pressure, thereby combusting a homogeneous air-fuel mixture in the main combustion chamber.