JPS6119939Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel supply system for an internal combustion engine, and more specifically, the present invention relates to a fuel supply system for an internal combustion engine. The present invention relates to the structure of a fuel supply device for an internal combustion engine, which is arranged in a manner that keeps the overall height low.

In conventional internal combustion engines that require a low height, such as those used in mobile walking agricultural machines, it is difficult to secure head pressure in the fuel tank, so a carburetor with a fuel pump is used as the carburetor. It was customary to do so.

However, with this conventional fuel pump-equipped carburetor, if the operation has been stopped for a long time, the residual fuel in the oil reservoir gradually decreases due to vaporization, etc., so when restarting, the fuel in the oil reservoir is Particularly when there is little fuel remaining in the fuel tank, the suction lift of the fuel pump becomes large, making it difficult to easily replenish fuel into the oil reservoir, making it difficult to start the internal combustion engine. The problem was that it became difficult.

In view of the above-mentioned problems, the present invention has been developed by attaching a gutter-like member of an appropriate length to the carburetor with a fuel pump, and supplying fuel directly into the oil sump chamber through the gutter-like member. The object of this invention is to provide a fuel supply system for an internal combustion engine that improves starting performance.

Hereinafter, the present invention will be explained based on the embodiment shown in FIGS. 1 and 2. In FIG. A mobile walking agricultural machine Z is shown in which a handle 7 for operating the work machine is attached to the rear of the machine body 1.

This internal combustion engine device A acts as a drive source for a working machine main body 1, and includes an internal combustion engine main body 2 and a fuel tank 5 disposed on the side of the internal combustion engine main body 2.
and are connected by a carburetor 4 with a fuel pump,
An air purifier 3 is attached to the end of the carburetor 4 on the intake inlet side.

As shown in FIGS. 1 and 2, the carburetor 4 includes an intake cylinder 20 on the upper side of a mounting flange part 21 that houses a diaphragm fuel pump (not shown), and an oil reservoir chamber 25 and a fuel suction pipe on the lower side. 22 are arranged.

This carburetor 4 is arranged so that the fuel pumping pipe 22 and the oil reservoir chamber 25 are inserted upward into an appropriately sized carburetor insertion hole 12 formed in the fuel tank upper wall 5a in close proximity to the oil filler port 11 of the fuel tank 4. The fuel tank 5 is airtightly attached to the fuel tank 5 by inserting the mounting flange portion 21 into the fuel tank upper wall portion 5a. Also, this vaporizer 4
One end 20a of the intake pipe 20 on the intake inlet side is connected to the air purifier 3, and one end 20b on the intake outlet side is connected to the intake passage inlet portion 2a of the internal combustion engine main body 2, respectively.

The oil reservoir chamber 25 has an upper side wall 2 on the oil filler port 11 side.
5a is bulged to an appropriate size, and a notch hole 26 of an appropriate size is formed in the bulge 28 to communicate the inside and outside of the oil reservoir chamber 25. A gutter-like member 30, which will be described later, is provided at one end 30a of this bulging portion 28.
is attached to the bulge 28 by a pivot pin 27 provided in the bulge 28 so as to be pivotable in the vertical direction, with the bulge 28 projecting into the oil reservoir chamber 25 by an appropriate dimension.

The gutter-like member 30 is made of synthetic resin or the like and has a cross-sectional shape, and its length is as long as when the gutter-like member 30 is rotated about the pivot pin 27 in the direction of arrow A to a substantially horizontal position. , the free end 30b side of the gutter-like member 30 is appropriately set so that it can appropriately overlap with the oil filler port 11 in the vertical direction.
In addition, this gutter-like member 30 has its free end 30b side dammed up with a sill plate 31, and the free end 30b side
is connected to the inner surface 13a of the cap 13, which is screwed onto the oil filler port 11, by a chain 33 of an appropriate length. Therefore, by removing the cap 13 from the oil filler port 11 and pulling up the chain 33, the gutter-like member 3 can be removed.
0 to a substantially horizontal position as shown by the chain line 30', and the fuel received in the gutter-like member 30 can be guided to the pivot side end 30a. Note that the gutter-like member 30 is connected to the cap 13
When the chain 33 is screwed into the oil filler port 11, rotation in the direction of the arrow A-B is not restricted by the chain 33.

The oil filler port 11 is provided with an oil filter 15 having a filter 17 filled in a casing 16. The casing 16 has a flange 16a, which is held between the oil filler port 11 and the cap 13. A large number of small holes 16c, 1 for oil permeation are provided at the bottom of the casing 16.
6c... is formed, and chain 3 is formed in the center.
A hole 16a is formed for passing 3 through the hole 16a.

Further, the reference numeral 23 in the figure indicates a strainer attached to the tip of the fuel pumping pipe 22, and the reference numeral 24 indicates a fuel intake pipe vertically installed from the intake cylinder 20 into the oil reservoir chamber 25.

The vaporizer 4 constructed as described above operates as follows. First, even if the internal combustion engine device A is restarted after being stopped for a long period of time, if the fuel tank 5 was almost full when the operation was stopped, the oil will be removed during the stoppage. Even if the fuel in the reservoir 25 is reduced due to vaporization or the like and the fuel suction pipe 24 is exposed to the air, the suction lift of the fuel pump is small, so the internal combustion engine main body 2 cannot be started manually or with a starting motor. Accordingly, fuel can be supplied into the oil reservoir chamber 25 and the internal combustion engine device A can be started relatively easily.

On the other hand, when the internal combustion engine device A is stopped with a small amount of fuel remaining in the fuel tank 5, the suction lift of the fuel pump is large, so even if the engine shaft is rotated, oil can easily accumulate. Starting is difficult because fuel cannot be supplied into the chamber 25, but in the carburetor of the illustrated embodiment, the oil filler port 1 is opened prior to the starting operation.
1, remove the cap 13 from the tank 1, pull up the gutter-like member 30 to an almost horizontal position as shown by the chain line 30' using the chain 33, and inject fuel into the fuel tank 5 from the oil filler port 11 through the oil filter 15. A part of the injected fuel flows directly into the oil reservoir chamber 25 through the gutter-like member 30, and the tip of the fuel suction pipe 24 is immersed in the fuel, so that the amount of fuel remaining in the fuel tank 5 is reduced. Regardless of the situation, the internal combustion engine device A can be started easily and quickly.

Moreover, since the gutter-like member 30 is fixed to its free end 30b side, when the gutter-like member 30 is rotated an appropriate number of times in the direction of the arrow A-B with the chain 33 when starting the internal combustion engine device A, The gutter-like member 30 acts as a kind of ladle, and can pump the fuel F accumulated at the bottom of the fuel tank 5 into the oil sump chamber 25.

As is clear from the above description, the fuel supply system for an internal combustion engine according to the present invention is capable of supplying fuel when pivoted vertically to one side of the oil reservoir protruding into the fuel tank and rotated to a substantially horizontal position. A gutter-like member of an appropriate length that can overlap vertically with the oil filler port of the tank is pivotally connected, and when fuel is injected into the fuel tank from the oil filler port, a portion of the injected fuel directly passes through the gutter-like member. Therefore, even if the internal combustion engine is used again after being installed for a long period of time, fuel will not flow directly into the oil sump chamber regardless of the amount of residual fuel in the fuel tank. This has the effect that the operability at the time of starting the internal combustion engine can be improved, such as being able to start the internal combustion engine by supplying the internal combustion engine.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a mobile walking agricultural machine having a fuel supply device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the carburetor shown in FIG. 1. 2...Internal combustion engine main body, 3...Air purifier, 4...
... Carburetor with fuel pump, 5 ... Fuel tank, 11
... Oil filler port, 25 ... Oil reservoir chamber, 30 ... Gutter-like member.

Claims (1)

[Scope of utility model registration request] A fuel tank 5 is disposed on the side of the internal combustion engine main body 2, and the fuel tank 5 and the internal combustion engine main body 2 are connected by a fuel pump-equipped carburetor 4 attached to the fuel tank 5. The air purifier 3 is attached to the intake inlet side of the container 4.
In the internal combustion engine, the carburetor 4 with the fuel pump
When the oil reservoir chamber 25 formed in the lower part of the fuel tank 5 is rotated to one side to a substantially horizontal position, it overlaps with the oil filler port 11 formed in the fuel tank 5 in the vertical direction, and from the oil filler port 11 into the fuel tank 5. A fuel supply for an internal combustion engine, characterized in that a gutter-like member 30 of an appropriate length, which acts to directly introduce a part of the fuel to be injected into the oil reservoir chamber 25, is pivotably pivoted in the vertical direction. Device.