SU857524A1 - Device for limiting internal combustion engine rotational speed - Google Patents

Description

(54) DEVICE FOR RESTRICTING THE ROTATION FREQUENCY OF INTERNAL COMBUSTION ENGINE

I

The invention relates to engine construction, in particular, to devices for limiting the rotational speed of an internal combustion engine.

Devices are known for limiting the rotational speed of an internal combustion engine, comprising a valve located at the inlet of the carburetor fuel chamber and driven by a diaphragm separating the fuel chamber from an additional compartment in communication with the atmosphere, and a pressurized air supply pipe from the pressure chamber of the fan effects on the diaphragm 1.

However, in known devices, it is impossible to reconfigure them to another predetermined air pressure of the fan corresponding to a different engine rotation frequency.

The purpose of the invention is to increase the reliability of the device.

To achieve this goal, the pipeline is connected to the carburetor fuel chamber and is equipped with a check valve with an adjustable threshold.

FIG. 1 is a diagram of connecting the device to the engine carburetor;

in fig. 2 - internal combustion engine with a device installed on it to limit the rotational speed.

The device contains a valve 1 (Fig. 1) located in the inlet of the fuel chamber 2 of the carburetor 3 and provided with a lever 4 on the axis 5 of the diaphragm 6. The diaphragm 6 separates the fuel chamber 2 from the additional compartment 7 communicated with the atmosphere. There is a pipeline 8 for supplying air under pressure from the pressure cavity 9 of the fan 10 (Fig. 2) to act on the diaphragm 6. The pipeline 8 is connected to the fuel chamber 2 of the carburetor 3 and is provided with a check valve 11 with an adjustable pOR. A spring 12 is connected to the lever 4 of the valve 1 15. The fan 10 is mounted on the crankshaft 13 (FIG. 2) of the engine 14. The pipeline 8 is provided with an air inlet 15.

The device works as follows.

In the idle mode and low engine load of the engine 14, the fan 10 creates in the pressure cavity (cochlea) 9 the air pressure determined by this mode, which

through the air intake 15 and the pipe 8 is transmitted to the carburetor 3. However, the check valve 11, adjusted to a certain pressure (response threshold) corresponding to a certain engine rotation frequency, remains closed and does not allow air into the fuel chamber 2 of the carburetor 3. At the same time, the fuel chamber 2 is constant but a vacuum is maintained, equal to the vacuum in the carburetor 3 diffuser, providing fuel to the carburetor 3. When the engine exceeds a given maximum frequency of rotation, we create e fan 10 in pressure chamber 9 increases, reaching the threshold of the check valve 11. The actuation of valve 11 is activated and air from line 8 enters the fuel chamber of the carburettor 3 2.

Under the action of air pressure, the diaphragm 6 bends, releasing the spring 12 and the lever 4 fixed on it with a valve 1, which blocks the air supply, as a result of which the mixture drastically depletes, skips misfire and lowers the frequency of rotation of the engine. The air pressure in the pressure cavity 9 of the fan 10 drops and the check valve 11 closes. The resultant vacuum in the fuel chamber 2 causes deflection of the diaphragm 6, which, acting on the lever 4 with the valve 1, opens the fuel supply. The fuel level is maintained by the difference between atmospheric pressure and pressure in the fuel chamber 2.

The invention allows to reconfigure the rotational speed of the engine by varying the tightening of the spring of the check valve 11, thus achieving reliability and ease of operation.

Claims (1)

Invention Formula A device for limiting the rotational speed of an internal combustion engine, comprising a valve located at the inlet 15 of the carburetor fuel chamber and driven by a diaphragm separating the fuel chamber from the additional compartment in communication with the atmosphere, and an air supply pipe 20 under pressure from the pressure cavity of the fan to act on the diaphragm, characterized in that, in order to increase reliability, the pipeline is connected to the carburetor fuel chamber and provided with a check valve with adjustable 25, the actuation threshold. Sources of information taken into account during the examination 1. US Patent No. 4007717, cl. 123-103, publ. 1977.