JP2528924B2 - Car engine carburetor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a carburetor for a vehicle engine.

[Conventional technology and its problems]

The engine installed as a power source of the vehicle has a carburetor connected to the intake hole, a fuel nozzle is opened in the venturi of the carburetor, and the intake air flowing through the venturi is sucked out and atomized to mix the intake gas. There is something that is being supplied to the engine. The carburetor has a float chamber, and the float that floats on the fuel oil level inside the float chamber opens and closes the fuel inlet / outlet valve to keep the fuel oil level inside the float chamber constant, allowing stable suction by suction. Therefore, the proper air-fuel ratio is obtained. By the way, the vehicle
The running condition changes constantly, and the centrifugal force causes the fuel oil level in the float chamber to tilt in the direction in which centrifugal force is applied. Lean. In such a case, the fuel flows excessively or becomes difficult to flow into the fuel outflow passage provided at the lower end of the float chamber, and the air-fuel ratio becomes rich or thin. As a result, the engine stalls and breathes, which is unpleasant. As a countermeasure against this, there is a partition wall provided in the float chamber near the inlet of the fuel outflow passage so that the inlet of the fuel outflow passage is not exposed above the fuel oil even if the fuel oil surface is inclined. See, for example, Japanese Utility Model Publication No. 53-157218. However, the height of the fuel oil level cannot be lowered and the air-fuel ratio cannot be reduced. or,
When the fuel oil level is tilted toward the fuel outflow passage side, it is impossible to avoid excessive concentration.

[Object of the Invention]

This invention is a vaporization of a vehicle engine that can stably supply fuel even when a vehicle equipped with an engine receives a centrifugal force while traveling on a curved road or undergoes rapid acceleration and deceleration to receive inertia. The purpose is to obtain a vessel.

[Structure of Invention]

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

The carburetor has an intake passage 2 provided with a venturi 1. The upper end of the intake passage 2 is connected to an air cleaner and the lower end is connected to an intake hole of an engine so that intake air flows from top to bottom. A throttle valve 3 is provided at the bottom of the valve, and the intake air flow rate is adjusted by rotating the throttle valve 3. A main fuel nozzle 4 is opened in the venturi 1, and a slow system nozzle 5 is opened in the vicinity of the throttle valve 3. Main fuel nozzle 4
The slow nozzle 5 is connected to the lower end of the float chamber 7 in the fuel outflow passage 6, and the main jet 8 is provided at the inlet to adjust the fuel flow rate. Float room 7
The float 9 is rotatably attached by a pin 10 so that the float 9 floats on the fuel oil surface. By opening and closing the float 9, the on-off valve 12 of the fuel inlet 11 is opened and closed to keep a constant oil in the float chamber 7. Keeping the face fuel always there. Float room 7
An air vent 13 is provided at the upper end of so as to apply atmospheric pressure. Therefore, the present invention is applicable to the float chamber 7
An auxiliary chamber 14 is provided on the side of the above so as to be below the fuel oil level. Then, the float chamber 7 and the auxiliary chamber 14 are partitioned by a movable plate 16 such as a diaphragm to which a weight 15 is attached. The auxiliary chamber 14 communicates with the fuel outflow passage 6 through a communication passage 17. A needle hole 18 for venting air is provided at the upper end of the auxiliary chamber 14.

[Operation of the invention]

When the vehicle curves to the right, centrifugal force is applied to the left side,
The fuel in the float chamber 7 moves to the left side. Therefore, on the main jet 8 side, the fuel oil level becomes low and the pressure drops,
It becomes difficult for fuel to flow into the fuel outflow passage 6, and if it is left as it is,
Fuel becomes thin. However, when a centrifugal force is applied, a centrifugal force is also applied to the weight 15 to bend the movable plate 16 and move it to the left,
The fuel in the auxiliary chamber 14 is pushed out. Therefore, it is possible to prevent the fuel in the auxiliary chamber 14 from flowing into the fuel outflow passage 6 through the communication passage 17 and becoming thin. When the vehicle curves to the left, centrifugal force is applied to the right side, and the fuel in the float chamber 7 moves to the right side. For this reason, on the main jet 8 side, the fuel oil level rises and the pressure rises, and extra fuel flows into the fuel outflow passage 6, and if it is left as it is, the fuel becomes excessively rich. But,
Centrifugal force is also applied to the weight 15 to bend the movable plate 16 and
Since the volume of 14 is increased, it is possible to prevent the fuel in the fuel outflow passage 6 from being sucked into the auxiliary chamber 14 and flowing through the communication passage 17 and becoming rich in fuel. If the weight 15 is provided so as to move in the front-rear direction of the vehicle, it is also possible to cope with inertia caused by sudden acceleration and deceleration of the vehicle. In this way, even if a centrifugal force or inertia is applied due to the driving condition of the vehicle, it is possible to always maintain a stable air-fuel ratio and prevent engine stop and breathing.

〔The invention's effect〕

As described above, according to the present invention, the auxiliary chamber is provided below the oil surface on the side of the float chamber of the carburetor, and the float chamber and the auxiliary chamber are partitioned by the movable plate to which the weight is attached. Since the auxiliary chamber is connected to the fuel outflow passage connected to the by the communication passage, the weight can be adjusted to the left and right by adjusting the weight to move in the left and right direction. Is provided so as to move in the front-rear direction, the amount of fuel outflow can be adjusted according to the inertial force during sudden acceleration / deceleration. In this way, it is possible to always supply the intake gas with a stable air-fuel ratio to the engine, prevent the engine from stopping and breathing, and obtain good driving performance.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. 6 ... Fuel outflow passage, 7 ... Float chamber, 14 ... Auxiliary chamber, 15 ... Weight, 16 ... Movable plate, 17 ... Communication path.

Claims (1)

(57) [Claims] 1. A fuel outflow in which an auxiliary chamber is provided below the oil surface on the side of the float chamber of the carburetor, and the float chamber and the auxiliary chamber are partitioned by a movable plate having a weight attached thereto and connected to the lower end of the float chamber. A carburetor for a vehicle engine, characterized in that an auxiliary chamber is connected to the passage through a connecting passage.