JP3503174B2 - Fuel supply device for internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank which is stored in a fuel tank.
Inhaled fuel is suctioned by the fuel pump, and
Fuel injection in a carburetor or fuel injector by pressurizing the fuel
The present invention relates to a fuel supply device for an internal combustion engine that supplies a valve. 2. Description of the Related Art A method of supplying a controlled fuel to an internal combustion engine
There are carburetor type and fuel injection type. The vaporizer method is as follows
Consists of below. The carburetor has an intake passage connected to the engine,
Throttle valve that controls the opening and closing of the passage and a constant fuel level inside
Float chamber and one end open to the intake passage, and the other end
Nozzles that open in
The liquid surface is formed in the fuel passage that opens into the float chamber.
The valve seat located at the end of the
Flow moving by a float that rotates according to the surface height
This is because opening / closing is controlled by the port valve. And
The fuel in the fuel tank is supplied to the fuel passage by the fuel pump.
Supplied. This fuel pump is pumped by a diaphragm.
The pump chamber is formed separately and the pump is reciprocated by the diaphragm.
The suction capacity of the suction side check valve
The fuel in the fuel tank is drawn into the pump chamber from the
The fuel in the pump chamber is discharged from the discharge passage with a discharge-side check valve.
The fuel is discharged into the fuel flow path. In addition, the diaphragm
Reciprocation of the engine is achieved by rotation of the camshaft of the engine.
The cam for pressing the diaphragm is rotationally driven, and this cam is driven.
This is done. Then, the fuel is discharged from the discharge path of the fuel pump.
The fuel pressure discharged into the fuel flow path is 0.3 kg / cm ^Two About
Set to degree. The fuel pressure is 0.3
kg / cm ^Two The setting depends on the pressure resistance of the float.
With high buoyancy when fuel pressure is increased
Large floats need to be used, and the entire vaporizer
Model, which hinders the degree of freedom of attachment to the engine.
You. On the other hand, the fuel injection system is air-based, fuel-based,
The air system is necessary for combustion of the engine.
It measures and controls air, and is filtered by an air cleaner.
The intake air is measured by the intake air amount sensor and sent to the engine.
Supplied. The fuel system supplies the fuel needed for engine combustion
The fuel tank pumped up by the fuel pump
The fuel inside the fuel tank depends on the pressure regulator.
5kg / cm ^Two The fuel is adjusted to the pressure of
(Delivery pipe) via a fuel injection valve
It is injected and supplied to Seki. And the fuel injection valve and the control system
Injection from ECU (Electronic Control Unit)
Inject fuel metered by the signal. Like this fuel
2.5 kg / cm pressure ^Two To maintain high pressure
Atomized fuel with a higher speed toward the engine than the fuel injection valve
It is necessary to inject and supply to. [0004] The above-described vaporizer system and
In the fuel injection system,
It is difficult to use the pump for sharing. That is,
0.3kg / cm ^Two Carburetor system with different fuel discharge pressure
Fuel pump used for fuel injection
When used as a pump, the fuel discharge pressure is low.
Missing fuel cannot be injected better than fuel injectors
Causes malfunction. In addition, the fuel pump diaphragm
It is necessary to prepare a new drive unit that gives reciprocating motion
This requires significant remodeling of the institution. On the other hand, 2.5 kg / cm ^Two High fuel discharge
The fuel pump used for the fuel injection system with pressure
When adopted as a fuel pump in the
Due to the high discharge pressure, the buoyancy of the float
Lose, the fuel level in the float chamber rises and overflows
A problem that occurs. To increase the buoyancy of the float
This overflow can be eliminated by
The sheet becomes large and cannot be put to practical use. A fuel pump used for a fuel injection system
Is generally stored in the fuel tank and the fuel pump
The discharge path is a fuel flow path from the fuel tank to the engine.
All the delivery pipes are piped. Where used at sea
In the fuel supply system installed in the engine to be
The tank and the engine are separated and arranged.
In the state, the fuel flow connecting the engine and the fuel tank
Roads must not flow pressurized fuel.
Be restricted. (However, the fuel flow in which the pressurized fuel flows
The route is directly located at the institution or
Those that are indirectly located in the vicinity do not have legal problems)
According to the above, the fuel pump located in the fuel tank
The carburetor or fuel injector mounted on the engine is
Connect with a fuel discharge path through which fuel with pressure flows
Is not possible, which is what fuel injection
Uses a fuel pump located in the fuel tank used
You can't. [0007] The present invention has been made in view of the above problems.
Easily compatible with both carburetor and fuel injection systems
A primary object is to provide a possible single fuel supply
And a small and inexpensive fuel supply device is provided.
This is a second object. [0008] An internal combustion engine according to the present invention is provided.
In order to achieve the above object, a fuel supply device
The fuel stored inside is sucked by the fuel pump and
In an internal combustion engine that supplies fuel to a fuel injector
In the fuel supply device, the base member has a bottomed cup shape
The first fuel that is hermetically sealed by mounting the first casing
A second housing in the form of a bottomed cup
To form a closed second fuel tank,
The first fuel tank has a valve seat of a carburetor or a fuel injection valve.
The fuel discharge passage connecting to the fuel tank is opened, and the fuel tank is provided in the second fuel tank.
The fuel inflow passage connected to the fuel tank is opened and the first fuel tank
And the second fuel tank are communicated through a communication passage, while the first fuel tank is connected to the first fuel tank.
Pump discharge of an electric positive displacement pump housed and arranged in a fuel tank
The outlet is connected to a fuel discharge passage that opens into the first fuel tank.
Of the filter stored in the second fuel tank
The filter discharge path is a communication path that opens into the second fuel tank.
Connected, and the base member has a fuel pressure of approximately 10 times
Attach a pressure regulator that can regulate pressure in a range
With fuel discharge path and pressure regulator fuel
To the fuel chamber via the regulator inlet,
2 communicates with the fuel tank via a return passage,
Outgoing path, communication path, fuel inflow path, regulator inflow path, Rita
The air passage is formed in the base member. When the electric displacement pump is driven, the fuel tank
The fuel in the tank is sucked into the second fuel tank via the fuel inflow passage.
Foreign matter is removed from the fuel in the second fuel tank by a filter.
Clean fuel is sucked into the first fuel tank through the communication passage.
It is. Next, the fuel in the first fuel tank is supplied to the electric displacement pump.
Discharged into the fuel discharge passage connected to the carburetor or fuel injection valve
Is done. Next, the fuel in the fuel suction tank is powered by an electric displacement pump.
The fuel is discharged into the fuel passage of the carburetor or the fuel injection valve.
The fuel discharged from the electric displacement pump into the fuel discharge path is
Fuel pressure set by pressure regulator
In the adoption of the vaporizer method,
0.3kg / cm ^Two The fuel set at the fuel pressure of
It is discharged toward the fuel flow path of the vessel. Meanwhile, the fuel injection method
2.5kg / cm ^Two Set to the fuel pressure
The specified fuel is discharged toward the fuel passage of the fuel injection valve.
You. Adjustment of the fuel pressure in this discharge path
Set the spring force of the spring of the regulator
Done by Also, the pressure regulator
The fuel flowing through the return passage during pressure regulation is
Without being returned to the second fuel tank.
Is sucked into the first fuel tank again. In addition,
A first fuel tank containing a positive displacement pump
Second fuel tank for storing filter and pressure regulation
The letter was attached integrally. Furthermore, the base member
Charge discharge path, fuel inflow path, communication path, regulator inflow path,
Providing a return passage. According to the fuel supply device
One that can be configured as a single member
Both effective for miniaturization and reduction of manufacturing cost
It is. An embodiment of the fuel supply apparatus according to the present invention will be described below.
Will be described with reference to FIG. The fuel supply device S is electrically driven.
A first fuel tank A having a positive displacement pump P, and a filter F
Fuel tank B provided with a pressure regulator R
It consists of. The first fuel tank A comprises the following. 1st fuel tank
A is a bottomed cup with an opening at the top facing upward from the bottom.
The opening at the top of the first housing is
Fixed in contact with the recessed first recess 1A
The inside of the first fuel tank A is formed in a hermetically sealed state together with the first recess 1A.
Is done. P is an electric displacement pump, and an electric motor P1
And a positive displacement pump P2, and the electric motor P1 is driven by a magnetic field.
Rotation caused by the current flowing between the magnetic field lines and the armature winding
A positive displacement pump P2
Between the ring and the movable member inscribed in it
Liquid is moved from suction side to discharge side by movement or change of space
And this positive displacement pump P2
It is rotated by the electric motor P1 to perform a pump action. this
The positive displacement pump P2 is, for example, a trochoid type, a vane type,
Roller vane type and gear type. (In addition, electric displacement type pon
Pump P is hereinafter simply referred to as a positive displacement pump P)
P is disposed in the first fuel tank A. Specifically, P
The pump P is in the first fuel tank A and is formed on the upper part.
The pump discharge path P3 is the first concave portion 1A of the base body 1.
Is connected to the fuel discharge passage 2 which is open to the outside. At this time the pump
The suction passage P4 opens toward the bottom of the first fuel tank A.
Reference numeral 3 denotes a second filter covering the opening of the pump suction passage P4.
It is. B is a second fuel tank, which is directed upward from the bottom.
Upper part of a bottomed cup-shaped second housing having an opening at the top of the paddle
Second recess 1 having an opening formed in the lower end surface of base member 1
B is fixed by being opposed to B via packing.
2 The fuel tank B is formed in a hermetically sealed state together with the second concave portion 1B.
You. F is a filter housed and arranged in the second fuel tank B
And inside the filtering member 4 such as a tubular cloth, paper, sponge, etc.
The filter discharge path 4B protrudes upward from the portion 4A.
Put out. The filter discharge path is provided in the first fuel tank.
A and a base member 1 that communicates with the second fuel tank B
Connected to the communication path 5. 6 is drilled in the base member 1
One end of the fuel inflow passage through the second recess 1B.
It is communicated into the second fuel tank B. The pressure regulator R is as follows:
It is formed. Right housing 9A and left housing 9B are diamond
Divided by the diaphragm 10, the diaphragm 10 and the left housing
A spring chamber 11 is formed by the body 9B and the diaphragm
The fuel chamber 12 is formed by the ram 10 and the right housing 9A.
It is. The diaphragm 10 is fueled in the spring chamber 11.
The spring 13 biasing toward the chamber 12 is contracted and
Atmospheric holes 14 are opened. 15 is a spring of the spring 13
Adjustment screw screwed to the left housing 9B to set the force
The end of which is connected to the spring 1 via the retainer 16.
3 at one end. That is, one end of the spring 13 is
The other end is in contact with the
It contacts the flam 10. A regulator inflow passage 18 is provided in the fuel chamber 12.
And the return passage 19 are opened, and the inflow passage 18 is
The return passage 19 is opened in the side wall of the charging room 12 and the seat 2
0 is opened at the center of the fuel chamber 12. Said rita
The sheet 20 provided in the diaphragm passage 19
The opening / closing is controlled by a valve unit 21 which moves integrally with the control unit.
And the pressure regulator R is
The lower end surface of the housing 9A is in contact with the upper end surface of the base member 1 and
It is fixedly arranged. Then, the right of the pressure regulator R
The regulator inflow passage 18 formed in the housing 9A is
Via a regulator inflow passage 18 formed in the base member 1
Connected to a fuel discharge passage 2 formed in the base member 1.
It is. Also, the right housing 9 of the pressure regulator R
The return passage 19 formed in the base member 1 is formed in the base member 1.
Into the second fuel tank B via the return passage 19 provided.
Will be contacted. Specifically, the return passage 19 is provided in the second concave portion.
Open to 1B. According to the above, the base member 1 has a positive displacement
The first fuel tank A containing the pump P and the filter F
The stored second fuel tank B and pressure regulator R
Are fixedly mounted. Also, in the base member 1
Has a fuel inflow passage 6 having one end opened into the second fuel tank B,
The fuel discharge passage 2 having one end opened in the first fuel tank A and the first fuel
A communication path 5 that connects the fuel tank A and the second fuel tank B has one end
The other end is connected to the fuel discharge passage 2 in the base member 1 and the other end is pressed.
Regulator flowing into the shear regulator R
The regulator inflow channel 18 connected to the channel 18 and one end
2 Connected to fuel tank B, the other end is pressure regulated
Rita connected to the return passage 19 drilled in the
Hole passage 19 is formed. T is a fuel tank in which fuel is stored,
C is a known vaporizer, which goes to the valve seat 30
A fuel passage 31 is provided, and D is a known fuel injection device.
And a fuel flow path 33 toward the fuel injection valve 32. These are connected as follows.
The fuel inflow passage 6 opening at the right end face of the base member 1 is a fuel tank.
Connected to the fuel tank T and is opened at the left end face of the base member 1.
When the vaporizer system is adopted, the discharge passage 2 is provided with a vaporizer C
Connected to the fuel passage 31 of the
Therefore, it is connected to a fuel flow path 33 connected to the fuel injection valve. Next, the operation will be described. First,
When using the fuel supply device S for the fuel injection system
explain. The downstream end of the fuel discharge path 2 is connected to the fuel injection device D.
Connected to the fuel passage 33 in the fuel cell. Fuel in the first fuel tank A
When the electric motor P1 is driven in a state where there is no charge,
This causes the positive displacement pump P2 to rotate. By this
And a large negative pressure on the pump suction passage P4 side of the positive displacement pump P2.
A negative pressure is generated in the entire chamber in the first fuel tank A.
Pressure state. As described above, the entirety of the first fuel tank A is
Can be set to a negative pressure state by using a positive displacement pump as a pump.
Can generate a large negative pressure.
When. And because the inside of the first fuel tank A is closed.
Then, the negative pressure in the first fuel tank A passes through the communication passage 5.
And introduced into the second fuel tank B, and the negative pressure in the second fuel tank B is
The fuel reaches the fuel inflow path 6. According to the above, the open end of the fuel inflow passage 6 is
Since the fuel inflow passage 6 is opened in the fuel tank T,
A negative pressure acts on the mouth end, and the fuel in the fuel tank T flows into the fuel tank.
Channel 6-flows into the second fuel tank B from the second concave portion 1B and is filtered.
It flows into the inner part 4A from the outer part 4C of the member 4 and
The foreign substances contained in the fuel were filtered and clean at the time of
The fuel further passes through the filter discharge path 4B and the communication path 5
The fuel is sucked into the first fuel tank A and the fuel is stored in the first fuel tank A
Is done. On the other hand, the fuel stored in the first fuel tank A has a volume
Pump P is sucked from the pump suction passage P4 of the pump
The fuel is discharged from the outlet path P3 into the fuel discharge path 2, and this fuel discharge
The fuel in the passage 2 is further supplied to the fuel injection valve via a fuel passage 33.
Injected from 32 toward the engine. On the other hand, the fuel pressure discharged from the positive displacement pump P
Force is regulated by pressure regulator R as follows
Is done. First, the pressure regulator R spring
The spring force of the spring 13 contracted in the housing 11 is 2.
5kg / cm ^Two The spring force so that it can be adjusted to the fuel pressure of
Is set strongly. Specifically, tighten adjustment screw 15
To shorten the set length of the spring 13. more than
According to this, the fuel discharged from the positive displacement pump P
The fuel in the discharge path 2 passes through the regulator inflow path 18
Pressure regulator R flows into fuel chamber 12
That fills the fuel chamber 12 and
Gradually increase fuel pressure. The fuel in the fuel chamber 12
According to the increase in pressure, the diaphragm 10 is gradually split.
Moves to spring chamber 11 side overcoming spring force of ring 13
Then, the valve portion 21 gradually opens the seat 20 and the fuel chamber 12
Of the fuel in the second recess 1B via the return passage 19
To reflux. Then, the fuel pressure in the fuel chamber 12 becomes 2.
5kg / cm ^Two With the pressure adjusted to
The force and the position of the diaphragm 10 are balanced, and in this state
The opening of the seat 20 of the valve portion 21 and the return passage 19 is set.
Is done. The fuel pressure in the fuel chamber 12 is 2.5 kg
/ Cm ^Two When raised further, the diaphragm 10
Press the spring 13 further than the fitted state to
Moved to the chamber 11 side to increase the opening of the valve section 21 and seat 20
As a result, the amount of reflux from the return passage 19 is increased, and again
2.5kg / cm ^Two To return to the fuel pressure of
On the other hand, the fuel pressure in the fuel chamber 12 is 2.5 kg / cm ^Two Yo
When the diaphragm 10 is lowered, the diaphragm 10 is in the balanced state.
To the fuel chamber 12 side by the spring force of the spring 13
To reduce the opening of the valve 21 and seat 20 and return
The amount of reflux from the passage 19 is reduced, and again, 2.5 kg /
cm ^Two The fuel pressure is returned to the normal pressure. Above
The fuel pressure in the fuel discharge passage 2 to the desired 2.5 kg / c
m ^Two From the fuel discharge path 2
2.5 kg / c to the fuel injection valve 32 through the fuel flow path 33
m ^Two It can supply a fuel having a fuel pressure of
The supply of the fuel is performed when the displacement pump P is driven.
In this way, the fuel injection
The engine operation by the launching device was successfully performed.
It is. In addition, from the return passage 19 to the inside of the second concave portion 1B.
The fuel that recirculates into the second fuel tank B again
This fuel is again inside the outer part 4B of the filter member 4.
Filter suction passage 4B sucked into portion 4A, communication passage
5 and is supplied into the first fuel tank A. Next, the fuel supply device S is used in a carburetor system.
A description will be given below. The downstream end of the fuel discharge path 2 is
Connected to the fuel passage 31 of the gasifier C. Meanwhile, pressure
-The slide that is contracted into the spring chamber 11 of the regulator R
The spring force of the pulling 13 is 0.3 kg / cm ^Two Fuel pressure
The spring force is used in the fuel injection system so that the pressure can be adjusted
Compared to the spring force of the spring 13 set at the time
Set weakly. Specifically, adjust the adjusting screw 15 to the above state.
Then, the set length of the spring 13 is set longer.
In this state, the electric motor P1 is driven to
When the pump P rotates, the fuel in the fuel tank T is
Is discharged from the positive displacement pump P into the fuel discharge passage 2.
But the fuel pressure of the fuel discharged into the fuel discharge path 2
Is regulated by pressure regulator R as follows
Is done. The fuel discharged from the displacement pump P flows
The fuel in the fuel discharge passage 2 passes through the regulator inflow passage 18.
And the pressure regulator R flows into the fuel chamber 12
Fills the fuel chamber 12 and fills the fuel chamber 12
Gradually increase the fuel pressure. In this fuel chamber 12
According to the increase in fuel pressure, the diaphragm 10 gradually moves
Overcoming the spring force of the spring 13 and moving toward the spring chamber 11
The valve 21 moves and the seat 20 is gradually opened to release the fuel chamber 1.
2 through the return passage 19 to the second recess 1B.
Reflux into the interior. In such a state, the fuel injection method
Pressure regulator R spring when hiring
13 when compared to the set spring force of the carburetor system.
Of spring 13 of pressure regulator R
Since the constant spring force was weakened, the spring of diaphragm 10
The movement to the side of the chamber 11 becomes large, and the seat by the valve portion 21
The opening of 20 becomes a large opening and flows through the return passage 19.
The amount of reflux also increases. Then, the fuel pressure in the fuel chamber 12 becomes
0.3kg / cm ^Two Spring 13 with pressure adjusted to
The spring force of the diaphragm and the position of the diaphragm 10 are balanced.
The opening of the valve portion 21 and the seat 20 of the return passage 19 are
Is set. Then, the fuel pressure in the fuel chamber 12 becomes 0.3
kg / cm ^Two When raised further, the diaphragm 10
Press the spring 13 further than the balanced state to
To the opening chamber 11 side to close the opening of the valve portion 21 and the seat 20.
To increase the amount of recirculation from the return passage 19,
And 0.3kg / cm ^Two To return to normal fuel pressure
On the other hand, the fuel pressure in the fuel chamber 12 is 0.3 kg / cm
^Two When the pressure drops further, the diaphragm 10
To the fuel chamber 12 by the spring force of the spring 13
Move to reduce the opening of the valve 21 and seat 20 and
To reduce the amount of reflux from the
/ Cm ^Two To return to the fuel pressure of more than
Therefore, the fuel pressure in the fuel discharge passage 2 is set to a desired 0.3 kg /
cm ^Two Can be adjusted to the fuel pressure of
0.3 kg / cm through the fuel passage 31 ^Two Fuel pressure
Can be supplied to the vaporizer. Soshi
Therefore, the supply of such fuel is difficult when the displacement pump P is driven.
It is performed continuously by the vaporizer
The engine operation was successfully performed. Then, the pressure regulator R
It is expected that the range of fuel pressure regulation by
Good. This is the fuel pressure (0.3 k
g / cm ^Two ) And the fuel pressure in the fuel injection system (2.5
kg / cm ^Two ) And 10 times (8.3 times more precisely)
This is because there is a difference. In the above embodiment, the pressure leg
Adjusting the fuel pressure by the adjuster R using the adjusting screw 15
Pressure regulation was 0.3kg / cm ^Two From 2.5kg
/ Cm ^Two It is not necessary to control linearly between
And two springs 13 are prepared in advance, and one is
kg / cm ^Two 1. A spring for pressure adjustment, and the other one
5kg / cm ^Two Suitable for use as a spring for pressure regulation
Set the spring in the spring chamber 11 each time
Is also good. According to the fuel supply device of the present invention,
A first fuel tank A provided with an electric displacement pump P
Second fuel tank B with filter F, pressure leg
And arrange them as a single device.
So that it can be attached to the upper lid of the first fuel tank A.
Member, the upper lid and the mounting member of the second fuel tank B,
The mounting member of the shear regulator R can be shared,
Kamo first fuel tank A and second fuel tank B, filter F and fuel
To the outflow channel 5 and the pressure regulator R
Regulator inflow channel 18, pressure regulator
Use return passage 19 from R as connecting pipe
The number of parts and assembly man-hours
Reduction and effective reduction of manufacturing costs.
You. In addition, the first fuel tank A, the second fuel tank B,
It is not necessary to arrange Ruler R individually.
This increases the degree of freedom of mounting. Also, the first fuel tank A, the second fuel tank B,
Shear regulator R is integrally attached to base member 1
However, what could be formed as a single device is directly
Mounting or placement near the engine
That can be done easily,
A fuel discharge passage 2 through which fuel pressurized by the pump flows;
Connect the fuel flow path 31 or 33 directly to or near the engine.
It can be placed beside the engine and fuel tank
The pressurized fuel in the fuel flow path connecting the
Those that can completely clear the marine use laws and regulations that there is no
And a fuel supply device mounted on an engine used at sea
It is the best one. Also, the retarder of the pressure regulator R
Passage 19 is opened into the second concave portion 1B of the base member 1.
This means that the return passage 19 is returned into the fuel tank T.
The length of the passage can be significantly reduced compared to
The passage 19 is no longer exposed to the outside.
Manufacturing costs by reducing the number of parts and assembly man-hours.
Reduced strikes and improved mountability to engines
It was done. In particular, the return passage 19 is exposed to the outside.
Not giving out greatly improves the reliability against fuel leakage.
It has come. As described above, the fuel supply device according to the present invention
According to the above, the following special effects are achieved. Electric positive displacement type pon
First fuel tank with pump and second fuel with filter
With a tank and a pressure regulator, the pressure
-Changing the setting spring force of the regulator spring
Is discharged from the fuel discharge path toward the fuel flow path
Very easily set the fuel pressure to the desired fuel pressure
Now that we have a single fuel supply system,
Can be used in common with any of the injection methods
And a significant improvement in productivity.
is there. In particular, the pressure regulator
So that the fuel pressure can be changed in a range of about 10 times
Can be applied to carburetor and fuel injection systems
It is what it was. First fuel with electric displacement pump
Tank, second fuel tank with filter, pressure leg
Groupers are arranged on a single base member
This effectively reduces the number of parts and the assembly man-hour.
Reduced, significantly reducing equipment manufacturing costs
It was done. According to the above, the fuel supply device
Can be mounted directly on the engine or in the vicinity of the engine
Fuel that can be placed and through which pressurized fuel flows
The flow path (including the discharge path) can be arranged near the engine or the engine
Therefore, it is suitable as a fuel supply device mounted on a marine engine.
It is suitable. Further, a first fuel tank, a second fuel tank,
Since pressure regulators are not arranged individually,
There is no need to consider mounting or piping.
This greatly improved the degree of freedom of mounting on the Seki.
The return passage is connected to the second concave portion of the base member or the filtering member.
According to the opening in the outer part of the short return path
Reduction is achieved and the return passage is exposed to the outside
Piping in the return passage
To prevent fuel leakage from the return passage
It is effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of a fuel supply device for an internal combustion engine according to the present invention. [Description of Signs] 1 Base member 2 Fuel discharge path 5 Communication path 6 Fuel inflow path 12 Fuel chamber 18 Regulator inflow path 19 Return path A First fuel tank B Second fuel tank P Electric positive displacement pump R Pressure regulator

Claims (1)

(1) A fuel supply device for an internal combustion engine that sucks a fuel stored in a fuel tank by a fuel pump and supplies the fuel to a carburetor or a fuel injection valve. In the above, a sealed first fuel tank A is formed by mounting a bottomed cup-shaped first housing on the base member 1, and a sealed housing is mounted by mounting a bottomed cup-shaped second housing. A second fuel tank B is formed, and the first fuel tank A has
The fuel discharge passage 2 connected to the valve seat 30 or the fuel injection valve 32 of the carburetor C is opened, the fuel inflow passage 6 connected to the fuel tank T is opened in the second fuel tank B, and the first fuel tank A is connected to the first fuel tank A. 2 The fuel tank B is communicated with the communication passage 5 while
The electric displacement pump P housed and arranged in the first fuel tank
The pump discharge path P3 is connected to the fuel discharge path 2 opening into the first fuel tank A, and the filter discharge path 4B of the filter F housed and disposed in the second fuel tank B is connected to the second.
A pressure regulator R which is connected to a communication passage 5 opened in the fuel tank B and which can regulate the fuel pressure in a range of about 10 times the fuel pressure in the fuel discharge passage 2 and the fuel in the fuel discharge passage 2 and the pressure regulator R is attached to the base member 1. The fuel chamber 12 and the second fuel tank B are communicated via a return passage 19, and the fuel discharge passage, the communication passage 5, the fuel inflow passage 6, and the regulator inflow. A fuel supply device for an internal combustion engine, wherein a passage (18) and a return passage (19) are formed in a base member (1).