JPS6143966Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for quickly and surely stopping a fuel vaporized engine by cutting off the fuel supply to the engine. The purpose is to simplify the structure of

Conventionally, in a fuel vaporized engine, stopping the rotational drive is done by cutting off the supply of electricity to the spark plug, but the air-fuel mixture is heated by the engine idling after the spark plug is cut. It was sent into the muffler and caused an out-of-cylinder explosion.

In order to eliminate such drawbacks, the present invention provides a valve body that shuts off fuel suction in the fuel suction path connecting the main jet inlet of the engine carburetor to the main nozzle outlet, and this valve body closes the fuel suction path. By shutting off the engine and immediately cutting off the fuel, it is possible to eliminate out-of-cylinder explosions during inertia rotation after the engine is stopped.

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

FIG. 1 is a front view of a forced air-cooled fuel vaporization engine with a recoil starter, and FIG. 2 is a cut-off sectional view of the carburetor.

A recoil starter 11 is provided on the front of the fuel vaporized engine 1, and this is connected to the engine crankshaft via a transmission pulley to enable manual starting operation, and is also connected to a cooling fan connected to the crankshaft. Yotsute recoil case 1
The air entering from the air intake port 13 of No. 2 is passed through the air guide case 14.
The air is blown out from the rear of the engine cylinder while being guided by the air, forcing it to cool down.

A fuel tank 15 is mounted above the engine, and an air cleaner 16 is connected to an intake port 17 via a carburetor 2 at an oblique lower left side thereof, and an oil pipe 18 connects the fuel tank and the carburetor.

The carburetor 2 consists of a bench lily tube 4 and a box-shaped float chamber 3 connected below it. The outlet 9 of the main nozzle projects from the float chamber.

Boss 20 from the center of the lower surface of the ventilate tube 4
is provided to protrude downward and a screw hole 21 is formed in the center thereof, and the main nozzle 7 having the fuel suction path 8 in the length direction is inserted and screwed into this screw hole.

Then, the main jet 5 is screwed to the side of the boss 20 on the lower side of the main nozzle, and the fuel cutoff valve 1 is installed.
The bottom of the fuel pot 22 is fastened to the lower end of the boss 20 via a bolt 23.

An adjustment part 25 is provided protruding from the side of the fuel pot 22 to open a valve chamber 26 in the lateral direction, and a recess 35 is provided at the tip of the operating rod 24 which is slidably and tightly fitted into the valve chamber 26.
The rear end of the fuel cutoff valve 10 is inserted into the cutoff valve 10, and a spring 28 with a weak elastic force is inserted between the collar 10a formed in the center and the closing body 27 of the operating rod to move the cutoff valve forward. It is pushed out to form an engine stop device.

The adjustment section 25 is provided with a pipe connection section 29 from the fuel tank to open a fuel supply path 32 to the valve chamber 26, and connected to the upstream side of the throttle section 30 of the valve chamber that the closing body 27 comes into contact with. Fuel is supplied by communicating the fuel supply path 32 from the front side of this constriction part to the check valve 31 provided above the float chamber. When the float 33 floats up as the oil level in the float chamber rises, the check valve acts. I'm trying to cut down on the amount of oil.

Therefore, in the engine stopping device described above,
By pressing the operating rod 24, the fuel cutoff valve 10 first closes off the inlet 6 of the main jet 5 to quickly and reliably stop the suction of fuel into the carburetor, and then further By pushing the operating rod, the closing body 27 at the tip closes the throttle part 30 of the valve chamber and also cuts off the fuel supply from the fuel tank. After that, even if you release your hand from the operating rod 24, the sliding resistance of the operating rod 24 will be reduced by the spring 28.
The operating rod 24 maintains its position by overcoming the elastic force.

The effects of the present invention will be described below.The engine is stopped by cutting off the fuel by shutting off the fuel suction path connecting the float chamber of the carburetor and the ventilate pipe with the fuel cutoff valve. During inertia rotation after the stop operation, the fuel in the float chamber of the carburetor is no longer drawn into the combustion chamber and sent to the muffler, thereby eliminating out-of-cylinder explosions.

Furthermore, since the fuel supply path can be shut off by the closing body fixed to the operating rod, the fuel supply into the float chamber can also be cut off. For this reason, keeping the operating rod in the cut position after the engine has stopped will prevent damage to the check valve or fuel cutoff valve installed in the float chamber, or if dirt gets caught in the fuel supply cutoff part. , can prevent fuel overflow from the float chamber.

Moreover, the structure for this is simple, consisting of a closure body, a fuel cutoff valve, a spring, etc., and the operation is as simple as pushing the operating rod into two stages, so it can be carried out at low cost and can be used with existing engines. It can also be easily applied.

[Brief explanation of the drawing]

FIG. 1 is a front view of a fuel vaporization engine, and FIG. 2 is a longitudinal sectional view of a carburetor. DESCRIPTION OF SYMBOLS 1...Engine, 2...Carburizer, 3...Float chamber, 4...Venture pipe, 5...Main jet, 6...Main jet inlet, 7...Main nozzle, 8...Fuel suction path, 9 ...Main nozzle outlet, 10...Fuel cutoff valve.

Claims (1)

[Scope of utility model registration request] The float chamber 3 of the carburetor 2 of the engine 1 and the ventilary pipe 4 are communicated via a narrow fuel suction path 8 that extends from the inlet 6 of the main jet 5 through the main jet 5 and the main nozzle 7 to the outlet 9 of the main nozzle, A fuel cutoff valve 10 is attached to the fuel suction passage 8 to shut it off, and the upper part of the float chamber 3 and the fuel tank 15 are communicated via a fuel supply passage 32 formed in the side wall of the float chamber 3 to supply fuel. Road 3
An operating rod 24 is attached to a valve chamber 26 formed in the middle of the valve chamber 26 so that it can be pushed or pulled from the outside, and a closing body 27 that shuts off the fuel supply path 32 is attached to the operating rod 24.
one end of the fuel cutoff valve 10 is passed through the side wall of the float chamber 3 and extended to the valve chamber 26;
This extended portion 36 is slidably provided on the closing body 27, and a spring 28 is interposed between the closing body 27 and the extended portion 36, so that the fuel cutoff valve 10 and the closing body are connected to each other via this spring 28. 27 can be interlocked and connected, the operating rod 24 is pushed in so that the fuel suction passage 8 can be shut off by the fuel cutoff valve 10, and from this cut-off state, the operating rod 24 is pushed in against the spring 28 and operated. A stop device for a fuel vaporizing engine, characterized in that a fuel supply path 32 can be shut off by a closing body 27.