JPH06330829A - Fuel feed device for gasoline engine - Google Patents

Abstract

PURPOSE:To improve operability and shorten piping so as to dissolve a problem such as vapor lock by providing an integrated fuel feed device on the fuel passage between a fuel tank and a carburetor, and arranging it between an air cleaner and a fan case or on the front face of the fan case. CONSTITUTION:A fuel feed device A is arranged in the dead space formed between an air cleaner C and a fan case F, and on the position under a carburetor B. Further, a one touch drain device D to return remaining fuel within the carburetor is similarly arranged side by side with the fuel feed device A. The fuel feed device A is provided with a pulsating pressure type pump and a primer pump 5, and a fuel tank T is standingly provided side an engine E and put side by side with the rear part of the air cleaner C on the cylinder head side. Hereby, the primer pump 5, a fuel cock 15, and the one touch drain device D can be arranged on the nearly same plane as the front face of the engine E, and hence all the operations related to fuel can be performed on the same side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a pulse pressure fuel supply system for a gasoline engine.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a pulse pressure fuel supply system for a gasoline engine has been publicly known.
For example, Japanese Utility Model Publication No. 62-180659 and Japanese Utility Model Publication No. 2
It is like the technique described in Japanese Patent Publication No. 69060.

[0003]

In the above-mentioned prior art, in the feed pump system of a small general-purpose engine or an OHV engine, the fuel pump, the fuel cock with the fuel strainer, and the carburetor drain are arranged separately and separately. Therefore, there were the following problems. That is, the operability of the fuel system at the time of starting / stopping was poor because it was not unified. Also, the piping that connects the fuel pump, fuel cock, and carburetor becomes longer,
There was a problem such as paper lock inside the pipe. It was also not good in terms of external design. SUMMARY OF THE INVENTION The present invention has as its object to eliminate such a drawback of the conventional technique.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, a pulsating pressure pump that operates by the pulsating pressure of an engine is installed in a fuel passage that connects a fuel tank and a carburetor, and a manual primer pump and a fuel cock equipped with a fuel filter mechanism are integrated into the pulsating pressure pump. The fuel supply device A is integrated or integrally attached to form a fuel supply device, and the fuel supply device A is arranged between the air cleaner and the fan case or in front of the fan case.

Further, the fuel tank is arranged upright on the cylinder head side of the inclined cylinder, and the fuel tank and the air cleaner are arranged front and rear.

Further, the carburetor B is attached to the fuel supply device.
The one-touch drain device for guiding the fuel to the drain circuit is also integrally arranged.

Further, in the fuel supply device, the operation part of the primer pump, the operation part of the fuel cock, and the operation part of the one-touch drain device are all arranged on the same side in front of the engine.

[0008]

[Operation] Next, the operation will be described. That is, it was possible to improve the operability when the operator operates the fuel supply system and shorten the piping for connecting the fuel systems. Also, due to shorter piping,
The problems such as paper lock inside did not occur either. Further, by arranging the fuel tank T upright at a position juxtaposed with the cylinder head H of the cylinder block L without arranging the fuel tank T above the cylinder block L, as a drive source for another working machine, The total height can be reduced when the engine E of the present invention is mounted. In addition, since the primer pump 5, the fuel cock 15, and the one-touch drain device D can be arranged on substantially the same plane in front of the engine E, all fuel-related operations can be performed.
It became possible to do it by operating the same part.

[0009]

EXAMPLES Next, examples will be described. 1 is a front view of an engine E in which a fuel supply device for a gasoline engine of the present invention is arranged, FIG. 2 is a rear view of the engine E of FIG. 1, FIG. 3 is a plan view of the engine E of FIG. 1, and FIG. Fuel tank T
4 is a front view of an embodiment of an engine E in which the engine is erected on the cylinder head H side, FIG. 5 is a rear view of the engine E of the embodiment of FIG. 4, and FIG. 6 is a plan view of the engine E of the embodiment of FIG. 7 is a right side view of the engine E of the embodiment of FIG. 4, and FIG. 8 is a fuel supply device A and a one-touch drain device D in which a pulse pressure pump and a primer pump 5 are integrally formed.
And FIG. 9 are enlarged front views of a configuration in which the fuel cells are arranged in a dead space between the fan case F and the air cleaner C, FIG. 9 is a front view of the fuel supply device A in which the primer pump 5 and the pulse pressure pump are integrated, and FIG. It is a side sectional view of supply device A.

The arrangement of the fuel supply device of the gasoline engine will be described with reference to FIGS. 1, 2 and 3. The engine E of the embodiment is a 1-cylinder gasoline engine of the tilt cylinder type. The fan case F is arranged on the front side of the cylinder block L, and the exhaust muffler M is arranged on the rear side. Then, a recoil starter mechanism is provided on the fan case F,
Or, it has a start-up motor mechanism. The grip G is a grip of the starting rope in the case of the recoil starter. On the fan case F side of the engine E, an air cleaner C is arranged side by side on the left side surface in front view near the cylinder head H. The present invention provides a carburetor B between the air cleaner C and the cylinder block L. Is intervening.

In the present invention, the fuel supply device A is arranged between the air cleaner C and the fan case F in a dead space formed below the carburetor B. Further, not only the fuel supply device A, but also the one-touch drain device D for returning the residual fuel to the drain circuit inside the carburetor B is also arranged side by side with the fuel supply device A. The fuel supply device A is connected to the one-touch drain device D by a mounting bracket 50.

Next, embodiments of FIGS. 4, 5, 6, and 7 will be described. The fuel supply device A of the present invention includes the pulse pressure pump and the primer pump 5, and the fuel tank T does not need to be guided to the carburetor B due to a weight drop, and the fuel tank T itself is arranged at a low position. You can do it.
Since the fuel is sucked from the fuel tank T arranged at the lower position by the pulse pressure type pump or the primer pump 5 and sent to the carburetor B, the engine E of the embodiment shown in FIGS. The fuel tank T is not shown in FIG.

On the other hand, in the embodiment shown in FIGS. 4 to 7, the fuel tank T is vertically installed side by side on the rear side of the engine E on the rear side of the air cleaner C on the cylinder head H side. The fuel tank T is connected to the cylinder head H.
The upper part is separated from the fan case F and the lower part is approached to the engine E side where the cylinder head H does not exist, so that the part contacting with the member does not deform due to high heat.
As seen from the front view of FIG. 4, it is deformed into an L shape.
In this case as well, the fuel supply device A and the one-touch drain device D are arranged below the carburetor B between the air cleaner C and the fan case F, but the present embodiment is the same. The lower part of the fuel tank T is projectingly arranged at the rear part of the fuel supply device A.

FIG. 8 discloses a configuration in which the pulse pressure fuel supply device for a gasoline engine of the present invention is arranged at the lower side portion of the engine E. Attached to the pulse pressure fuel supply device, the one-touch drain device D is attached to the mounting bracket 5
It is attached through 0. The pulse pressure fuel supply device,
It is composed of a filter cup 21, a pump body 1, a primer pump 5, and the like.

The construction of the fuel supply system A will be described with reference to FIGS. 8, 9 and 10. By taking the pulse pressure of the engine from the pulse pressure IN joint 12 and operating the diaphragm 10 sandwiched between the sandwiching body 2 and the body rear surface body 3 back and forth, the fuel is filtered from the fuel IN port 13 connected to the fuel tank. Diaphragm 10 after filtration in cup 21
And is discharged to the carburetor B through the discharge joint 14 by the compression operation of the diaphragm. A primer pump 5 capable of supplying fuel when there is no engine pulse pressure is integrated with the pump body upper lid 4, and a fuel cock 15 is integrated with the pump body 1. Reference numeral 26 is a bolt for fixing the pump body upper lid 4 to the pump body 1.

The main body of the pulse pressure fuel supply system is constructed by fastening a pump body 1, a sandwiching body 2 and a body rear face body 3. On the front side of the pump body 1, a primer pump 5 is clamped and fixed via a tightening plate 4. A check valve seat 24 is sandwiched between the back surface of the pump body 1 and the body rear surface body 3. Further, a portion of the diaphragm 10 is sandwiched between the sandwiching body 2 and the rear body 3 of the body.

A discharge joint 1 is provided above the pump body 1.
4, the relief joint 22 is projected on the left side surface of the pump body 1 when viewed from the front. A fuel IN port 13 and a pulse pressure IN joint 12 are fixedly provided on the rear body 3 of the body. A pipe from a fuel tank T is connected to the fuel IN port 13, and a fuel cock 15
Fuel is guided into the strainer cup 21 via the. Further, the fuel filtered by the filter cup 21 is guided to the primer pump 5 or the diaphragm 10.

When the engine is started, since the engine is not still rotating, the pulse pressure pump does not operate and the fuel is not delivered to the carburetor from the fuel tank arranged below. The primer pump 5 is provided. The primer pump 5 is a dome-shaped elastic body, and is configured as a pump that discharges fuel by pushing it with a fingertip and sucks fuel from the filter cup 21 by the restoring force of the elastic body when the fingertip is returned. There is.

[0019]

Since the present invention is constructed as described above, it has the following effects. That is, as in claim 1,
A pulsating pressure pump that operates by the pulsating pressure of the engine is installed in a fuel passage that connects the fuel tank and the carburetor, and the pulsating pressure pump is integrated with a manual primer pump and a fuel cock equipped with a fuel filter mechanism. Since the fuel supply device A attached integrally is configured and the fuel supply device A is arranged between the air cleaner and the fan case or in front of the fan case, the operability when the operator operates the fuel supply system is improved. The piping for connecting the fuel systems could be shortened. In addition, since the piping is shortened, problems such as paper lock inside will not occur.

Further, since the fuel tank is vertically arranged on the cylinder head side of the inclined cylinder and the fuel tank and the air cleaner are arranged at the front and rear, the fuel tank T is arranged above the cylinder block L. When the engine E of the present invention is mounted as a drive source for another working machine by vertically arranging the fuel tank T at a position juxtaposed with the cylinder head H of the cylinder block L without arranging, The total height can be lowered.

Further, as in claim 3, the one-touch drain device D for guiding the fuel of the carburetor B to the drain circuit is also provided integrally with the fuel supply device A, so that the primer pump 5 and the fuel cock are integrated. 15 and one-touch drain device D
Can be arranged on substantially the same plane in front of the engine E, so that all fuel-related operations can be performed by operating the same portion.

In the fuel supply system A, the operation part of the primer pump, the operation part of the fuel cock, and the operation part of the one-touch drain device are all arranged on the same side on the side surface of the engine E. Therefore, it is possible to simplify the handling of piping and improve the mountability on the working machine.

[Brief description of drawings]

FIG. 1 is a front view of an engine E in which a fuel supply device for a gasoline engine of the present invention is arranged.

FIG. 2 is a rear view of the engine E of FIG.

FIG. 3 is a plan view of the engine E of FIG.

FIG. 4 is a front view of an embodiment of an engine E in which a fuel tank T is erected on the cylinder head H side.

FIG. 5 is a rear view of the engine E of the embodiment shown in FIG.

FIG. 6 is a plan view of the engine E of the embodiment of FIG.

FIG. 7 is a right side view of the engine E of the embodiment shown in FIG.

8 is an enlarged front view of a configuration in which a fuel supply device A and a one-touch drain device D, which are integrally configured with a pulse pressure pump and a primer pump 5, are arranged in a dead space between a fan case F and an air cleaner C. FIG.

FIG. 9 is a front view of a fuel supply device A in which a primer pump 5 and a pulse pressure pump are integrated.

FIG. 10 is a side sectional view of the fuel supply device A.

[Explanation of symbols]

 A Fuel Supply Device B Vaporizer C Air Cleaner D One Touch Drain Device E Engine F Fan Case H Cylinder Head T Fuel Tank 5 Primer Pump 10 Diaphragm

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02M 35/04 B 37/16 D 37/22 AM

Claims (4)

[Claims] 1. A fuel having a pulsating pressure pump operated by pulsating pressure of an engine interposed in a fuel passage connecting a fuel tank and a carburetor, the pulsating pressure pump having a manual primer pump and a fuel filter mechanism. A fuel supply device in which a cock is integrated or integrally attached is configured, and the fuel supply device is
A fuel supply device for a gasoline engine, which is arranged between the air cleaner and the fan case or in front of the fan case. 2. A fuel supply device for a gasoline engine, wherein the fuel tank according to claim 1 is vertically arranged on a cylinder head side of an inclined cylinder, and the fuel tank and an air cleaner are arranged in front and rear. 3. A fuel supply device for a gasoline engine, characterized in that a one-touch drain device for guiding the fuel of the carburetor to the drain circuit is also integrally arranged attached to the fuel supply device according to claim 1. 4. The fuel supply device according to claim 2,
A fuel supply device for a gasoline engine, wherein the operation part of the primer pump, the operation part of the fuel cock, and the operation part of the one-touch drain device are all arranged on the same side in front of the engine.