JPS5819300Y2 - engine - Google Patents

Description

[Detailed description of the invention] In order to improve the combustion effect, the present invention secures ignition of the ignition plug by making the mounting part of the ignition plug protrude into the combustion chamber in an engine configured to inject air into the cylinder. This is related to a new engine.

Generally, non-flammable gases etc. after combustion in an engine remain in the parts that contact the inner wall of the cylinder and the inner wall of the combustion chamber without being blown away by the intake mixed gas, preventing the next combustion and preventing cooling by the intake mixed gas. As this was not carried out, the temperature of the inner wall increased, promoting the generation of nitrogen oxides.

For this reason, conventionally, an air jet port is provided on the inner surface of the cylinder directly above the mixture jet port, and air is injected to form an air layer in contact with the cylinder and combustion chamber. This method improves the combustion effect and reduces exhaust gas pollution by replenishing fuel and cooling the inner wall, but in engines using this method, the area around the spark plug is covered with an air layer and there is insufficient air-fuel mixture. Therefore, there was a drawback that ignition became uncertain.

The present invention provides a protruding mounting part of the spark plug in the combustion chamber, and by making the ignition part of the spark plug protrude into the combustion chamber, the cylindrical body part at the tip of the spark plug is housed in the mounting part, and the mounting part It is possible to prevent overheating of the cylindrical body by heat conduction, thereby preventing self-ignition, and to ensure ignition by making the ignition part of the ignition plug protrude beyond the air layer on the combustion chamber wall into the mixture layer. It is possible.

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

In the figure, 1 is the engine cylinder, 3 is the cylinder 1
A piston is slidably provided inside, 5 is a crankshaft,
7 is a crank, 9 is a connecting rod connecting the crank 7 and the piston 3, 11 is a crank chamber provided at the bottom of the cylinder 1, 13 is a combustion chamber provided at the top of the cylinder 1, 15
17 is an exhaust port that opens at the bottom of the side wall of the cylinder 1, and 17 is an exhaust port that opens below the exhaust port 15. When the piston 3 rises, the carburetor (
an intake port 1 that communicates between the crank chamber 11 (not shown) and the crank chamber 11;
9 is a check valve provided in the intake port 17, and the crank chamber 11
It communicates only in the direction of.

Reference numeral 21 denotes an air outlet provided below the side wall of the cylinder 1, and an air reservoir chamber 27 is provided in the middle of a communication hole 25 that communicates with the outside air via a check valve 23.

29 is a communication hole that communicates the crank chamber 11 and the air reservoir chamber 27.

Reference numeral 31 denotes a mixture jet port which is arranged in parallel with the air jet port 21 in the circumferential direction, and in this embodiment, as shown in FIG. It is formed in an L-shaped cross section.

33 is a communication hole that communicates the air-fuel mixture jet port 31 and the crank chamber 11.

Reference numeral 35 denotes a guide piece provided on the upper surface of the piston 3, which guides the air jetting out from the air jetting port 21 and the mixture jetting out from the mixture jetting port 31 so as to change the direction upward.

Reference numeral 37 denotes a mounting portion protruding from the upper part of the inner surface of the combustion chamber 13, and an ignition plug 39 is screwed into the center portion of the mounting portion.

41 is a cylindrical body portion of the spark plug 39, and 43 is an ignition portion.

In the above configuration, when the engine is operated, when the piston 3 rises, the air-fuel mixture flows from the carburetor (not shown) to the check valve 19 and the intake port 17 due to the negative pressure in the crank chamber 11.
It enters the crank chamber 11 through the.

At the same time, the check valve 23 is connected to the air reservoir chamber 2 through the communication hole 29.
Air is sucked into 7.

Ignition is performed by the spark plug 39 at the upper limit position of the piston 3, and the air-fuel mixture is combusted, causing the piston 3 to move downward.

When the piston 3 descends, the exhaust port 15 first opens to discharge the gas after combustion, and the air jet port 21 opens, and the air in the air reservoir chamber 27 is discharged by the pressure of the crank chamber 11 to the air jet port 21. It is ejected into the cylinder 1.

At the same time, the air-fuel mixture in the crank chamber 11 is ejected from the air-fuel mixture outlet 31 into the cylinder 1 through the communication hole 33 .

These air and air mixture cause cylinder 1. The residual gas in the combustion chamber 13 is discharged from the exhaust port 15.

The air-fuel mixture ejected from the air-fuel mixture spout 31 is ejected in the direction of the spark plug 39 by the guide piece 35, and
Since the injection starts at the same time, the vicinity of the ignition part 43 of the spark plug 39 can be covered with the air-fuel mixture without weakening the injection force.

In addition, since the mounting portion 37 of the spark plug 39 is provided to protrude into the combustion chamber 13, the cylindrical portion 41 of the spark plug 39 is not overheated, and mixture is mixed across the air layer existing in contact with the inner wall. The ignition part 43 can be provided in the air.

As described above, since the present invention has the configuration as described in the claims, it is possible to form an air layer along the inner wall of the combustion chamber by jetting air into the cylinder from the air jet port. However, the air-fuel mixture will be present near the ignition part of the spark plug, ensuring ignition.
This can prevent ignition failure.

3 and 4 are explanatory diagrams showing other embodiments of the mounting portion 37, in which a wind receiving piece 45 is further protruded from the end of the mounting portion 37, and the wind receiving piece 45 is provided at the end of the mounting portion 37. The jetted air-fuel mixture is received by the wind receiving piece 45 or reversed to concentrate the rich air-fuel mixture near the ignition part 43 of the spark plug 39.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional explanatory diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the main part of the embodiment of the present invention, Fig. 3 is a sectional view of the main part of another embodiment, and Fig. 4 is a cross-sectional diagram of the main part of the embodiment of the present invention. FIG. 4 is an explanatory diagram in the IV-IV line direction of FIG. 3; Explanation of the symbols representing the main parts of the drawing 1...
Cylinder, 3... Piston, 11...
Crank chamber, 13... Combustion chamber, 21...
・Air outlet, 23... Check valve, 31...
...Mixture mixture outlet, 35...Guide piece, 37...
...Mounting part, 39...Spark plug, 41...
...Cylinder part.

Claims (1)

[Scope of utility model registration request] A spark plug 3 is attached to the inner surface of the combustion chamber 13 provided at the top of the cylinder 1.
The mounting portion 37 that covers the sexual circumference of the cylindrical body portion 41 of No. 9 is attached to the combustion chamber 1.
an air jet nozzle 21 that protrudes within the cylinder 1 and opens diagonally upward at the lower side wall of the cylinder 1; and an air mixture jet that opens diagonally upward in the vicinity of a position immediately below the air jet nozzle 21. The air jet port 21 is provided in communication with the outside air via the check valve 23 in the suction direction, and is provided in such a way that it can freely communicate with the crank chamber 11, and the air-fuel mixture jet port 31 is provided in communication with the crank chamber 11. The air outlet 2 is provided in communication with the air outlet 2 and is slidably provided within the cylinder 1.
1 and the upper part of the piston 3 that opens and closes the mixture jet port 31, for guiding the air and mixture jetted from the air jet port 21 and the mixture jet port 31 in a direction along the inner wall surface of the cylinder 1. An engine characterized in that a piece 35 is provided.