JPH05209518A - Internal combustion engine - Google Patents

Abstract

PURPOSE:To provide an internal combustion engine of low environmental pollution by arranging an air introducing part for introducing air in the exhaust passage connected to an exhaust port, and providing this air introducing part near to the exhaust port, so that the burnable components included in the high- temperature exhaust gas can be burned to incinerate the harmful components in the exhaust gas. CONSTITUTION:An internal combustion engine is provided with a cylinder 2 having a combustion chamber 1 and a piston 3 which slides inside the cylinder 2. And the upper part of the cylinder 2 is provided with an intake port 4 and an exhaust port 5. In this case, an air-introducing part 7 for introducing air is arranged to the exhaust passage 6 connected to the exhaust port 5. The air-introducing part 7 is arranged so as to be near to the exhaust port 5. A air injection nozzle 8 opened toward the exhaust manifold side is provided at the end of the air-introducing part 7. By introducing air from the air- introducing part 7 to the exhaust passage 6 for burning the burnable components in the exhaust gas by this air, the harmful components in the exhaust gas can be incinerated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine having low pollution.

[0002]

2. Description of the Related Art Conventionally, in order to prevent pollution, various methods have been implemented in order to reduce harmful components contained in exhaust gas discharged from an engine as much as possible.

For example, a small auxiliary combustion chamber is provided in the upper part of the combustion chamber of the engine, and a rich mixed gas is sent there to ignite, and a thin mixed gas in the main combustion chamber is burned at a temperature within a range where NO _x is not generated, or CO Various means such as purifying harmful components in exhaust gas with a catalytic converter that absorbs NO _x and HC are provided.

However, these methods have drawbacks in that the engine structure is complicated and the cost is high.

An object of the present invention is to solve this problem and to provide an internal combustion engine having a simple structure and capable of removing harmful components in exhaust gas as much as possible.

[0006]

The gist of the present invention will be described with reference to the accompanying drawings.

An internal combustion engine having a cylinder 2 having a combustion chamber 1 and a piston 3 sliding in the cylinder 2 and having an intake hole 4 and an exhaust hole 5 in the upper portion of the cylinder 2,
The present invention relates to an internal combustion engine characterized in that an air introduction part 7 for introducing air is provided in an exhaust passage 6 connected to the exhaust hole 5, and the air introduction part 7 is provided near the exhaust hole 5.

[0008]

The air is introduced into the exhaust passage 6 from the air introduction portion 7 provided in the exhaust passage 6, the combustible components in the hot exhaust gas are burned by this air, and the harmful components in the exhaust gas are burned and removed.

The reason why the air introducing portion 7 is provided near the exhaust hole 5 is that the air from the air introducing portion 7 is directly blown to the flame from the combustion chamber 1 ejected from the exhaust hole 5. When the air introduction part 7 is located away from the exhaust hole 5,
Since the flame from the exhaust hole 5 is short, the air from the air introducing portion 7 does not reach the flame, and combustion of harmful components is not achieved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings illustrate a preferred embodiment of the present invention.

A description will be given below.

An air introducing portion 7 for introducing air is provided in an exhaust passage 6 connected to the exhaust hole 5, and the air introducing portion 7 is connected to the exhaust hole 5.
And an air injection nozzle 8 that opens toward the exhaust manifold side as shown in the drawing is provided at the tip of this air introduction portion 7. The air sent from the air injection nozzle 8 is pressurized and sent by the compressor 12. The air pressure pressurized and sent by the compressor 12 may be higher than the exhaust gas pressure from the exhaust hole 5. A check valve is provided in the air supply passage 17 from the compressor 12 so that the compressed air is not sent backward.

In the present embodiment, the case where the air injection nozzle 8 constantly sends the pressurized air is shown. However, the cam 10 'and the compressor 12 are interlocked, and the exhaust hole 5 is opened. The structure may be such that pressurized air is sent out at the time.

Since this embodiment has the above-mentioned structure, the following operational effects are exhibited.

During the exhaust stroke of the internal combustion engine, the piston 3 rises, and in conjunction with this movement, the cam 10 'of the camshaft 10
When the exhaust valve 11 moves downward and the exhaust hole 5 opens,
Exhaust gas in the cylinder 2 is discharged to the exhaust manifold via the exhaust hole 5.

At this time, since fresh air constantly pressurized by the compressor is constantly ejected from the air injection nozzle 8 to the exhaust passage 6, combustible components in the high temperature exhaust gas are burned.

Since the air injection nozzle 8 is open toward the exhaust manifold side, air is not introduced into the cylinder 2.

Further, since the air from the air injection nozzle 8 ejects air having a slightly higher pressure than the exhaust gas, the combustion flame of the exhaust gas does not enter the air injection nozzle 8.

In the figure, reference numeral 9 is a crankshaft, reference numeral
13 is an intake valve, 14 is an ignition part, 15 is a connecting rod, and 16 is a crank wheat.

[0020]

According to the present invention, air is introduced into the exhaust passage connected to the exhaust hole to burn the combustible components in the exhaust gas, so that the harmful components in the exhaust gas are burned and removed. A simple and effective low-pollution internal combustion engine.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing the operation of the present invention.

[Explanation of symbols]

 1 Combustion chamber 2 Cylinder 3 Piston 4 Intake hole 5 Exhaust hole 6 Exhaust path 7 Air introduction part

Claims (1)

[Claims] 1. An internal combustion engine comprising a cylinder having a combustion chamber and a piston that slides in the cylinder, and having an intake hole and an exhaust hole in the upper portion of the cylinder, and an exhaust passage connected to the exhaust hole. An internal combustion engine characterized in that an air introducing portion for introducing air is provided and the air introducing portion is provided near an exhaust hole.