JPS5830119Y2 - Intake air introduction device in vaporizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake air introduction device that introduces intake air into a carburetor from an air cleaner provided on the side of the carburetor.

The carburetor in an internal combustion engine generally introduces intake air from an air cleaner installed at the top of the carburetor, but installing an air cleaner at the top of the carburetor increases the overall height including the air cleaner. If the height is not sufficient due to the engine room, etc., it is possible to install an air cleaner on the side of the carburetor and use an elbow-shaped connector to change the direction of intake air from the cleaner from horizontal to vertical. It is done.

However, introducing intake air through an elbow-shaped connector in this way results in complicated airflow behavior within the connector, and the airflow is introduced into the float chamber of the carburetor from the air vent inserted into the air horn of the carburetor. The pressure will vary considerably depending on the behavior of the airflow within the connector,
Particularly at high speeds where the amount of intake air is large, the dynamic pressure of the air vent decreases at a rate that increases with respect to the increase in the amount of intake air, resulting in a flat state in which fuel consumption does not increase as the amount of intake air increases, and as a result, the air-fuel ratio As a result, a misfire occurs due to a change in the amount of fuel to the lean side, resulting in a decrease in output and an increase in HC.

The present invention solves the above-mentioned drawbacks in the high-speed range by providing a buckle plate inside the connector to improve the airflow of the intake air when intake air is introduced into the carburetor through the elbow-shaped connector. This example will be explained with reference to the drawings. In the drawing, 1 indicates an intake manifold, 2 indicates a double carburetor attached to the intake manifold 1, and a float chamber (
(not shown) is equipped with air vents 4.5 for introducing dynamic pressure.

Reference numeral 6 denotes an air cleaner provided on the side of the vaporizer 2, and an elbow-shaped connector 9 connected to the outlet pipe 7 of the air cleaner 6 via a hose 8 is attached to the upper surface of the vaporizer 2 and connected to the air cleaner 6. In changing the direction of the intake air from the hose 8 from horizontal to vertical and introducing it into the carburetor 2 (
However, the figure shows a case in which the cross section of the connector 9 is formed into a spiral shape and is attached to the carburetor 2), and the intake air flow in the connector 9 starts to change from horizontal to vertical direction in the inlet passage 10. In this method, a baffle plate 11 is provided that blocks approximately half of the passage in a portion of the carburetor 2 that is far from the air vents 4 and 5, so that the airflow of intake air is directed to the air vent 4.
, 5.

In this way, the inlet passage 1 in the elbow-shaped connector 9
By providing the baffle plate 11 in the 0, a part of the intake air introduced into the carburetor 2 through the connector 9 is directed toward the air bends 4 and 5 by the baffle plate 11, and in this case, When the amount of intake air is large in the high speed range of the engine, the airflow directed to the air vents 4 and 5 by the baffle plate 11 out of the total airflow is larger than the airflow directed to the air vents 4 and 5 in the middle or low speed range of the engine. As a result, the flow rate naturally increases, so the dynamic pressure in the air vents 4 and 5 compensates so that the pressure in the float chamber does not decrease even if the amount of intake air increases.

Therefore, the pressure difference between the venturi part of the carburetor and the float chamber, which is largely related to the fuel consumption from the main nozzle (not shown) of the carburetor 2, gradually increases as the intake air amount increases. Therefore, in the high-speed range of the engine, the fuel consumption does not level off as the amount of intake air increases, and the air-fuel ratio can be maintained at a predetermined level.

Therefore, according to the present invention, when the intake air is introduced into the carburetor through the elbow-shaped connector, the airflow of the intake air inside the connector can be improved and the air-fuel ratio will not be diluted in the engine high speed range. This has the effect of reliably preventing a decrease in output and an increase in HC due to misfires in high-speed ranges.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line ■-■. 1... Intake manifold, 2... Carburetor, 3... Air horn, 4, 5... Air vent, 6... Air cleaner, 8・・・・・・
・Hose, 9...Connector 10...
Entrance passage, 11...4 baffle plates.

Claims (1)

[Scope of utility model registration request] When the intake air from the air cleaner is introduced into the air horn of the carburetor through the elbow-shaped connector, a buckle is provided in the inlet passage of the connector to direct the airflow of the intake air to the air vent in the air horn of the carburetor. An intake air introduction device in a carburetor that is provided with a plate.