JPS591098Y2 - General-purpose engine fuel supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a fuel supply system for a small general-purpose engine using a gravity drop fuel supply system.

Conventionally, the fuel tank of a small general-purpose engine has only one fuel outlet on the bottom surface, so if the engine is tilted, such as when driving a vehicle with the engine installed on a slope, the fuel in the tank may drain. If the engine is biased to one side, there is a risk that the fuel near the fuel outlet will run out and the engine will run out of fuel even though there is a large amount of fuel remaining in the tank.

The present invention has been developed in view of the above points, and includes providing fuel outlets at the same front and rear positions on the bottom of the fuel tank, and forming two fuel inlets of the strainer to form each fuel outlet of the fuel tank. and each fuel inlet of the strainer are connected by a pipe, and a valve rod is arranged at the intersection of the front and rear fuel passages leading to each fuel inlet of the strainer.The valve rod is rotated to connect the front and rear base fuel. It is equipped with a balancer that can switch the opening and closing direction of the passage.

With this configuration, the balancer is actuated by the longitudinal inclination of the strainer to rotate the valve stem, and the opening/closing directions of the front and rear base fuel passages are switched, and the fuel flow is formed at the longitudinal position on the bottom of the tank. The outlet is selectively used, so regardless of whether the engine (fuel tank) is horizontal, tilted forward, or tilted backward, the engine will run out of fuel even if there is fuel remaining in the tank, unlike conventional methods. To provide a fuel supply device for a general-purpose engine that can effectively use up the fuel in a tank without causing any problems.

Another object of the present invention is to provide a fuel supply system for a general-purpose engine in which the direction of opening and closing of the front and rear fuel passages is automatically switched according to the direction of inclination of the engine by using a balancer to switch the opening and closing directions of the front and rear fuel passages. It is on offer.

Next, embodiments of the present invention will be described with reference to the drawings.

The fuel tank 1 has a fuel inlet 2 on the top surface, to which a cap 3 is removably screwed together, and has fuel outlet ports 4 at the same front and rear positions on the bottom surface.

The strainer 5 has a vertical fuel passage 7 passing through it from the upper end to the lower end of the body 6, and a cup 10 is detachably attached to the lower end of the body by screwing a ring nut 11 through a filtering net 8 and a backing 9. It is being

This cup 10 has the above-mentioned fuel passage 7 for supplying fuel into the cup 10 on its opening upper surface, and a supply passage 10' for supplying the fuel filtered and stored in the cup 10 to the carburetor side.
In both cases, the lower end portions are exposed through the filter application net 8.

The strainer 5 extends from the outer periphery of the bottle 6 to the vertical fuel passage 7.
It has a blind hole 12 for the cock, and this blind hole 12
A gasket 13 is fitted at the intersection with the fuel passage 1.

This gasket 13 has through holes 14 and 14, which communicate with the fuel passage 7, formed at the upper and lower ends of its outer periphery.

The cock 15 is rotatably fitted into the blind hole 12 by fitting the small diameter portion of the tip into the gasket 13 and locking the pin 1 to prevent removal.
6 is connected to the outer circumference groove 17, and a lever 1 is attached to the outer circumference of the body 6.
B stands out.

The cock 15 has a communication passage 19 that communicates with the fuel passage 7, and is open when the communication passage 19 is aligned with the fuel passage 7, and closed when it is shifted.

The valve case 20 is connected to the strainer 5 via the backing 21.
It is tightly fastened to the upper end of the body 6 with screws 22.

The valve case 20 has front and rear fuel passages 23.23 in the front and rear positions, and a valve through hole 24 is formed from the intersection position of the fuel passages 23.23 to the upper and lower ends. The through hole 24 is for the body 6 of the strainer.
It communicates with a vertical fuel passage 7 formed in .

The end openings of the front and rear fuel passages 23.23 have a fuel inlet 25.25 protruding from the upper end, and a fuel inlet 25.25 is provided inside.
．． A passage 26.25 communicates with the fuel passage 23.23.
Union nuts 27, 27 having 26 are threaded together.

The valve through hole 24 of the valve case 20 is connected to the front and rear fuel passages 23.
．． A gasket 29 having a through hole 28.2B communicating with each fuel passage 23.23 is fitted at the intersection of the fuel passages 23.23.

The valve rod 38 has a distal end fitted into the gasket 29 and penetrates the valve through hole 24, and a pinion 31 is carved into the base protruding from the upper end of the valve case 20.

This valve rod 30 has a notch 32 shown in FIG. 4 formed at its tip fitted into the gasket 29, and the position of the notch 32 and each through hole 2B formed in the gasket 29 are adjusted by rotation of the valve rod 30. , 28, the front and rear fuel passages 23
．． The opening/closing direction of 23 can be switched.

That is, the notch 32 of the valve stem 30 has a half-moon shape in cross section,
When the engine is tilted forward or backward, it communicates with the front or rear fuel passage 23, respectively, and when the engine is not tilted, it communicates with the fuel passages 23, 23 on both sides.

The balancer 33 has a shaft 34 projecting downward, and the shaft 34 is fitted into and pivotally supported in a fitting hole 35 formed at the upper end of the valve case 20, and a weight 36 is mounted on one side with the pivot shaft 34 in between. An arcuate rack piece 37 is provided on the other side.

This rack piece 37 has a rack 38 engraved on its inner peripheral wall, and the rack 38 meshes with the pinion 31 of the valve stem 30.

The shaft 34 and valve stem 30 of the balancer 33 are fitted with lock pins 39 and 40, respectively, and the valve case 20
The guide grooves 41 and 42 protrude toward the outer circumference from guide grooves 41 and 42 formed on the outer circumference.

The rotation angle range of the balancer 33 and the valve stem 30 is regulated by the lock pin 39, 40 and the guide groove 41, 42, respectively, and is 180 degrees in the longitudinal direction of the tank 1.

Further, the fuel outlet ports 4, 4 of the fuel tank 1 and the fuel inlet port 25, 25 on the strainer side are connected to pipes 43, 44, respectively.
It is connected at

In the drawing, reference numeral 45 indicates dust for attaching the strainer, 46 indicates an air cleaner, 47 indicates a carburetor, 4B indicates a spark plug, 49 indicates a cylinder, and 50 indicates a muffler.

Next, the operation of the fuel supply device of the present invention will be explained.

For example, when a traveling vehicle equipped with a general-purpose engine tilts forward due to driving on a slope, etc., the weight 3 of the balancer 33
6 rotates in the inclination direction, and the rack 38 of the balancer 33
The notch 32 of the valve stem 30 is positioned in the inclined passage hole 28 to open the inclined fuel passage 23.

On the other hand, when the engine is in a horizontal state, the weight 36 of the balancer 33 is located in the middle, and the notch 36 of the valve stem 30
is rotated to an intermediate position to open the through holes 2B and 28 on both the front and rear sides.

To stop the fuel supply, turn the cock 15 provided on the body 6 of the strainer 5.
This is done by shifting the communication passage 19 and the fuel passage 7.

In the device of the present invention, the balancer 33 swings due to inertia when the vehicle is started, but this swing is only temporary, and the fuel passages 23 and 23 on both the front and rear sides are not closed at the same time. Furthermore, since fuel is already supplied into the strainer 5, there is no problem of the engine running out of fuel.

In the device of the present invention, the balancer 33 and the valve case 20
The mounting direction may be shifted by 90 degrees from the position of the embodiment, or may be rearranged after mounting.

Furthermore, the body 6 of the strainer 5 and the valve case 20 may be formed integrally.

Furthermore, when the engine is mounted on a traveling vehicle, the tank 1 and the engine body may be mounted at separate locations.

As mentioned above, the present invention provides fuel outlets at the same positions in the front and rear of the bottom of the fuel tank, and forms the fuel inlet of the strainer in two places, so that each fuel outlet of the fuel tank and the strainer are connected to each other. Each fuel inlet is connected with a pipe, and a valve rod is arranged at the intersection of the front and rear fuel passages leading to each fuel inlet of the strainer, and the valve rod is rotated to open and close the front and rear fuel passages. Since the strainer is provided with a balancer that can be switched, when the strainer is tilted in the front-rear direction, the balancer is activated and automatically rotates the valve stem, thereby switching the opening/closing direction of the front-rear fuel passage.

Therefore, the fuel outlets formed at the front and rear of the bottom of the tank are selectively used, and the fuel in the tank is effectively used regardless of whether the engine (tank) is horizontal, tilted forward, or tilted backward. This has the effect of preventing the engine from running out of fuel due to the tilt of the tank even though there is fuel left in the tank.

In addition, since the balancer is pivotally supported on the upper part of the balancer and the rack part provided on the balancer is engaged with the pinion of the valve stem, the number of parts and the number of man-hours for assembly are small, and the installation space is not taken up. However, there is no balancer in the operation part such as the handle or the part extending to the outside, and the balancer is located above the strainer at the lower part of the fuel tank, thereby preventing erroneous operation or malfunction due to hooking on other members.

[Brief explanation of the drawing]

Figure 1 is a side view showing an engine using the device of the embodiment of the present invention, Figure 2 is a plan view showing the same device of the present invention, Figure 3 is a sectional view taken along the line III--III in Figure 2, and Figure 4. 1 is a partially cutaway front view of the device of the present invention. In the figure, 1 is a fuel tank, 4 is a fuel outlet, 5 is a strainer, 7 and 23 are fuel passages, 25 is a fuel inlet, 30 is a valve rod, 33 is a balancer, and 43 and 44 are pipes.

Claims (1)

[Scope of utility model registration request] A fuel outlet provided at the bottom of the fuel tank, and a fuel inlet of a strainer provided below the fuel tank and filtering the fuel supplied from the fuel outlet in a gravity drip manner to remove solids. In a general-purpose engine fuel supply system connected by a pipe, fuel outflow ports are provided at the same front and rear positions on the bottom of the fuel tank, and the fuel inlet of the strainer is connected to two
Connect each fuel outlet of the fuel tank and each fuel inlet of the strainer with a pipe, intersect the front and rear fuel passages leading to each fuel inlet of the strainer, and install a valve at the intersection. A rod is rotatably disposed and a pinion is provided at its upper end, and a balancer having a weight and a rack portion is rotatably supported on the upper part of the strainer, and the rack portion of the balancer is connected to the valve. A general-purpose engine fuel supply device characterized by engaging a pinion on a rod.