JP2003106232A - Fuel system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a fuel system installed in a fuel tank of a two-wheeled vehicle, and in particular, to obtain the desired discharging performance. SOLUTION: In this fuel system comprising a plunger pump 20 reciprocated by electromagnetic impetus for sucking the fuel from a suction port 53a' and discharging the same from a discharge port 29a', a fuel pressure regulator 40 mounted at a downstream side of the discharge port 29a' for adjusting the pressure of fuel by opening and closing fuel passages 41a, 42a, and a suction filter 50 mounted to cover at least the circumference of the suction port 53a', a vapor escape passage 60a is formed for eliminating the vapor generated inside the suction filter 50 while distancing the vapor from the circumference of the suction port 53a. Whereby the suction of the vapor into the suction port 53a' can be prevented even when the vapor is generated in the suction filter 50.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an internal combustion engine (hereinafter,
The present invention relates to a fuel supply device applied to supply fuel to an injector (referred to as an engine), and particularly to a fuel supply device installed in a fuel tank of a vehicle such as a motorcycle equipped with a small displacement engine.

[0002]

2. Description of the Related Art As a system for supplying fuel to an engine mounted on a four-wheeled vehicle or the like, a fuel supply device in which a fuel pump, a fuel pressure regulator, a filter and the like are integrally incorporated and arranged in a fuel tank is known. ing. As a fuel pump which constitutes this fuel supply device, for example, a circumferential flow type turbine pump is adopted. The turbine pump has a relatively large and complicated structure including a pump portion, a motor portion, and the like, and since it has no self-priming ability, it is arranged in the fuel tank. Therefore, this fuel supply device is suitable when the fuel supply device is housed in a relatively large fuel tank such as a fuel tank of a four-wheeled vehicle.

[0003]

By the way, in a small displacement engine, such as a two-wheeled vehicle equipped with an engine of about 50 cc to 250 cc per cylinder, the fuel tank is relatively small, and its shape is also small. Due to restrictions, it is difficult to accommodate the above fuel supply device in the fuel tank. In addition, in motorcycles, etc., the engine, fuel tank, etc. are arranged in relatively close areas, so the fuel supply system should be as insensitive to radiant heat from the engine as possible and should not fall down. In order to avoid damage to the system, it is necessary to simplify the system as much as possible to reduce the number of parts themselves or to prevent them from being exposed to the outside.

Further, when the temperature of the fuel in the fuel tank rises due to radiant heat from the engine or other factors, vapor (air bubbles) may be generated in the vicinity of the bottom surface of the fuel tank. Even in such a case, It is necessary to secure a desired fuel discharge performance and supply a stable fuel.

The present invention has been made in view of the above points, and its purpose is to reduce the size, simplify the structure, improve the functional reliability, ensure a stable fuel discharge performance, and the like. In particular, it is an object of the present invention to provide a fuel supply device suitable for a vehicle such as a two-wheeled vehicle equipped with an engine having a small displacement.

[0006]

A fuel supply device of the present invention is a fuel supply device which is installed in a fuel tank and supplies fuel to an injector of an internal combustion engine. A main body that defines a passage, a plunger pump that reciprocates inside the main body by an electromagnetic starting force to draw fuel from an intake port and discharge the fuel from a discharge port, and a fuel passage formed in the main body on the downstream side of the discharge port. A fuel pressure regulator that opens and closes to adjust the fuel pressure, an intake filter attached at least to cover the periphery of the intake port formed in the lower part of the main body, and a vapor generated inside the intake filter of the intake port. And a vapor removing means for removing the vapor away from the surroundings. According to this configuration, when vapor is generated in the suction filter when the fuel is at a high temperature, the generated vapor is removed away from the suction port by the vapor removing means. Therefore, only the fuel is sucked from the suction port, and the stable fuel is supplied.

In the above structure, the vapor removing means may be a vapor escape passage extending vertically upward from the lower end opening communicating with the suction filter and opening at the upper end opening at a predetermined position. According to this structure, the vapor generated in the suction filter is guided into the vapor escape passage from the lower end opening and escaped upward from the upper end opening. Therefore, only the fuel is sucked from the suction port, and the stable fuel is supplied. in this way,
With the simple structure of the vapor escape passage, the vapor accumulated in the suction filter can be moved away from the vicinity of the suction port.

In the above structure, the lower end opening is positioned above the suction port in the vertical direction.
Configuration can be adopted. With this configuration, since the lower end opening of the vapor escape passage is located above the suction port, the vapor generated in the suction filter can be more smoothly and more reliably moved away from the suction port.

In the above structure, the upper end opening may be positioned so as to open above the liquid surface of the fuel when installed in the fuel tank. According to this structure, since the upper end opening of the vapor escape passage is open to the air, the vapor can be released more smoothly.

In the above construction, a construction in which a filter is provided at the upper end opening can be adopted. With this configuration, it is possible to prevent dust and the like from entering through the upper end opening of the vapor escape passage.

Further, in the above-mentioned structure of the present invention, the vapor removing means is formed so as to surround the main body, integrally includes an intake filter, and has an upper opening portion which is opened at a predetermined position vertically above. A configuration that is a filter case can be adopted. According to this configuration, when vapor is generated in the intake filter (filter case) when the fuel is at high temperature, the vapor thus generated rises in the space inside the filter case, and from the upper opening to the outside of the filter case. It escapes into the fuel tank. Therefore, only the fuel is sucked from the suction port, and the stable fuel is supplied. In particular, the space between the filter case and the main body can serve as a passage for the vapor to escape, so the escape passage can be made large, and even if vapor occurs around the suction port, it can be prevented from remaining there and immediately sucked. Can be kept away from the mouth.

In the above structure, the suction filter may be provided at least on the lower surface and the lower side surface of the filter case. With this configuration, the area of the suction filter can be secured as necessary, and the suction resistance can be reduced.

In the above structure, the suction filter may be provided on the lower surface of the filter case at a position facing the suction port. According to this configuration,
By providing the suction filter at a position facing the suction port, the pressure loss near the suction port can be reduced, and the vapor generation itself can be suppressed.

In the above structure, the upper opening may be positioned so as to open above the liquid surface of the fuel when installed in the fuel tank. With this configuration, since the upper opening of the filter case is open to the air, the vapor that has risen in the filter case can be released more smoothly.

In the above structure, it is possible to adopt a structure in which a filter is provided in the upper opening. With this configuration, it is possible to prevent dust and the like from entering the filter case through the upper opening.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5
Shows an embodiment of a fuel supply device according to the present invention. A fuel supply device 10 according to this embodiment constitutes a part of a fuel supply system for supplying fuel to an injector driven by a solenoid valve in an engine that injects fuel by electronic control. As shown in 1,
The fuel is supplied through a supply pipe 5 to an injector 4 installed in a fuel tank 1 of a motorcycle and attached to an intake port 3 of an engine 2.

As shown in FIGS. 2 and 3, the fuel supply device 10 includes a plunger pump 20 and a fuel pressure regulator 4 for adjusting the pressure of fuel on the upstream side of the injector 4.
And 0 are integrated and modularized without using a connecting pipe or the like to form a main body B of the device. An intake filter 50 is attached below the main body, and the intake filter 50 is provided with a vapor escape pipe 60 that defines a vapor escape passage 60a as a vapor removing means. The device as a whole is compactly integrated, small in size, and formed in a convenient contour.

The plunger pump 20 is an electromagnetically driven positive displacement pump, and as shown in FIG. 4, a cylinder 21, a plunger 22 inserted so as to linearly reciprocate by sliding in the cylinder 21, and a cylinder. The yoke 23 fitted on the outer circumference of the bobbin 21 and the bobbin 2 fitted on the outer circumference of the yoke 23
4a, the outer case 2 formed of a resin material or the like so as to cover the outer circumference of the electromagnetic coil 24 and the electromagnetic coil 24.
It has 5 etc.

An end face wall 23a is formed at the upper end of the yoke 23, and a through hole 23a 'is formed at the center thereof,
It communicates with the outside. A coil sling ring 26a is arranged between the end wall 23a and the plunger 22. Further, the lower end of the yoke 23 has a suction port 27a.
A passage member 2 in which a fuel passage 27a having a lower end is formed
7 is fitted. The passage member 27 is the fuel passage 27a.
The poppet valve 28 for opening and closing is held in a state of being biased in the closing direction by the spring 28a. A coil spring 26b is arranged between the upper end surface of the passage member 27 and the plunger 22.

A joint member 29, which extends in a direction perpendicular to the reciprocating direction of the plunger 22 and forms a fuel passage 29a having a discharge port 29a 'at its tip, is connected to the lower side surface of the yoke 23. The joint member 29 is a fuel passage 29.
A check valve 30 for opening and closing a is held in a state of being biased in a closing direction by a spring 30a.

On the upper side surface of the outer case 25, a female electric connector 25a is formed which projects in a direction perpendicular to the reciprocating direction of the plunger 22. Electrical connector 2
5a is a terminal 25a as electric wiring of the electromagnetic coil 24
′ Is held exposed in the connection hole.

The fuel pressure regulator 40 includes the injector 4
Is an inlet control type regulator that adjusts the fuel pressure (fuel pressure) upstream of the joint member 2 as shown in FIG.
9, a horizontal tubular portion 41 defining a fuel passage 41a communicating with the discharge port 29a ′ of the fuel cell 9, and a vertical tubular portion 4 defining a fuel passage 42a communicating with the fuel passage 41a and extending vertically.
2, a mounting flange portion 43 integrally formed at the upper end portion of the vertical tubular portion 42, a regulating valve disposed between the fuel passage 41a and the fuel passage 42a to open and close both passages to adjust the fuel pressure. 44, and a male electric connector 45 including terminals 45a. As shown in FIG. 4, a joint member 29 is fitted in the horizontal tubular portion 41, and the fuel passage 41a
A check valve 46 for opening and closing is held in a state of being biased in a closing direction by a spring 46a. The check valve 46 and the spring 46a form a part of the adjusting valve 44.

As shown in FIG. 4, a diaphragm 47 forming a part of the regulating valve 44 is arranged in the intersecting space between the fuel passage 41a extending horizontally and the fuel passage 42a extending vertically. . The diaphragm 47 includes a diaphragm body 47a, a spring 47b, and a through hole 47.
and a cover cap 47c having c '. Then, a part of the diaphragm body 47a comes into contact with the needle 46b of the check valve 46, and the spring 4
The check valve 46 is opened against the biasing force of 6a.

A connecting portion 48 for connecting the connector of the supply pipe 5 to the fuel passage 42a is formed on the upper surface of the mounting flange portion 43, and the terminal 4 is provided in the internal space on the side portion thereof.
A connector 49 is formed for electrical connection, exposing 9a. The terminal 49 a of the connector 49 is electrically connected to the terminal 45 a of the electric connector 45 via the electric wiring embedded in the main body of the fuel pressure regulator 40.

As shown in FIG. 4, the lower end portion 2 of the yoke 23 is
The suction filter 50 is attached to 3b (that is, around the region where the passage member 27 is fitted). As shown in FIGS. 2 to 4, the suction filter 50 is formed in a flat shape with a substantially rectangular outline, and is for connecting the mesh-shaped filter body 51 and the filter body 51 to the lower end portion 23 b of the yoke 23. Fitting cylinder part 52, fitting cylinder part 5
2 is a suction cylinder portion 5 extending downward from the filter body 51.
3, the connecting cylinder portion 54 connected to the vapor escape pipe 60
And the like.

The suction cylinder portion 53 defines a fuel passage 53a on the upstream side of the suction port 27a ', and the suction port 53a' located at the lower end portion thereof is a substantial suction port through which the plunger pump 20 sucks fuel. Has become. As shown in FIGS. 2, 3, and 5, the suction cylinder portion 53 and the connection cylinder portion 54 have respective center lines P in two directions orthogonal to each other on a horizontal plane.
The distance between L and BL is formed so as to be separated by distances D1 and D2. Further, the lower end opening 54 a ′ of the connecting cylinder portion 54 is more than the suction port 53 a ′ of the suction cylinder portion 53,
It is formed so as to be located above the dimension H in the vertical direction.

As shown in FIGS. 2 and 5, the vapor escape pipe 60 defining the vapor escape passage as the vapor removing means has its lower end portion 61 fitted onto the connecting cylinder portion 54 of the suction filter 50, and the vapor escape pipe 60 is released. The passage 60a extends upward in the vertical direction and opens at the upper end opening 62 located near the lower side of the mounting flange portion 43. Further, the upper end opening portion 62 is provided with a filter 63 for preventing dust and the like from entering the vapor escape passage 60a. That is, the passage 54a of the connecting tubular portion 54 fitted to the lower end portion 61 forms a part of the vapor escape passage, and the lower end opening portion 54a forms a substantial lower end opening portion of the vapor escape passage 60a. There is.

Here, the upper end opening 62 of the vapor escape pipe 60 is mounted in the fuel tank 1 as shown in FIG.
As shown in (1), it is positioned so as to open above the liquid surface S. The vapor relief pipe 60 may be formed integrally with the main body of the fuel pressure regulator 40 or the plunger pump 20, or may be formed by a pipe of another member so that the lower end portion 61 is fitted to the connecting tubular portion 54. The upper middle part is the main body of the fuel pressure regulator 40 or the main body of the plunger pump 20 (that is,
It may be fixed to the main body B) of the device.

Next, the operation of this fuel supply system will be described. First, when the electromagnetic coil 24 is energized, the plunger 22 moves downward in the reciprocating direction to compress the fuel in the space V1. When the fuel is compressed to exceed the predetermined pressure, the check valve 30 opens against the biasing force of the spring 30a, and the compressed fuel is discharged from the discharge port 29a '.

When the energization of the electromagnetic coil 24 is cut off, the plunger 22 moves upward due to the biasing force of the coil spring 26b. At the same time, the poppet valve 28 resists the biasing force of the spring 28a due to the pressure difference.
Is opened, fuel is sucked from the suction port 53a ', and the space V
It flows into 1. After that, the coil springs 26a, 2
When the urging force of 6b is balanced, the plunger 22
Stops.

The above operation has been described with respect to the basic operation when the plunger 22 reciprocates once, but in the normal operation, the electromagnetic starting force and the electromagnetic starting force generated by the duty control of the energization of the electromagnetic coil 24 are performed. The plunger 22 is continuously reciprocated by the interaction with the biasing force of the coil springs 26a and 26b in the returning direction, so that a predetermined volume of fuel corresponding to the moving stroke thereof is continuously discharged from the suction port 53a '. It is sucked and then discharged from the discharge port 29a 'at a predetermined pressure.

Further, in the fuel passages 41a and 42a on the downstream side of the discharge port 29a ', the fuel pressure regulator 40
When the pressure in the fuel passage 42a or the diaphragm chamber C is equal to or higher than a predetermined pressure by the adjusting valve 44 of No. 4, the check valve 46 closes the fuel passage 41a by the urging force of the spring 46a. In this state, when the fuel pressure in the fuel passage 42a becomes equal to or lower than a predetermined level,
The diaphragm 47 is actuated by the urging force of the spring 47b to press the needle 46b and open the check valve 46. As a result, the fuel on the upstream side of the fuel passage 41a flows into the diaphragm chamber C, and the fuel passage 42a
Be led to. Then, when the pressure of the fuel in the fuel passage 42a becomes equal to or higher than a predetermined level, the diaphragm 47 is actuated by the pressure and the check valve 46 is closed.

On the other hand, when the temperature of the fuel in the fuel tank 1 becomes high, the lower region of the fuel tank 1 and the intake filter 5
Inside 0, vapor (air bubbles) is easily generated.
In particular, inside the suction filter 50, the suction port 53
Since the fuel is sucked from a ', the suction filter 50
Negative pressure is generated due to the resistance of the suction filter 50.
The vapor generated inside tends to stay in the suction filter 50 as it is.

By the way, since the suction filter 50 is provided with the vapor escape passage 60a having the lower end opening 54a 'on the upper surface of the filter body 51, the suction filter 5
The vapor generated in 0 immediately moves upward through the vapor escape passage 60a without staying, and is released into the air in the fuel tank 1 through the upper end opening 62.

In particular, the suction port 53a 'is the suction filter 50.
And the lower end opening 54a 'of the vapor escape passage 60a is positioned above the suction port 53a' by the distance H in the vertical direction, and therefore, the suction port 53a '.
Immediately move away the vapor generated around the lower end opening 54
It acts so as to suppress or prevent as much as possible vapor which is guided to a'and sucked into the suction port 53a '. As a result, even if the fuel is in a high temperature state, the generated vapor is reliably removed from around the suction port 53a 'by the action of the vapor escape passage 60a, and stable discharge performance is ensured without causing a decrease in the flow rate. Therefore, the fuel of a predetermined flow rate is stably supplied.

6 to 10 show another embodiment of the fuel supply device according to the present invention. Similarly to the above, the fuel supply device 100 according to this embodiment also constitutes a part of the fuel supply system that supplies fuel to the solenoid valve driven injector in the engine that injects fuel by electronic control. As shown in FIG. 6, the fuel is supplied through the supply pipe 5 to the injector 4 installed in the fuel tank 1 of the motorcycle and attached to the intake port 3 of the engine 2.

As shown in FIG. 7, the fuel supply device 100 includes a plunger pump 200 and a fuel pressure regulator 40 for adjusting the fuel pressure upstream of the injector 4.
And 0 are integrated and modularized without using a connecting pipe or the like to form a main body B of the device. A filter case 600 as a vapor removing means is formed in the main body B so as to surround the main body B and the suction filter 500 is integrally insert-molded.
Is attached. Then, as shown in FIGS. 7 to 10, the entire apparatus is compactly integrated, formed in a small size, and has a contour convenient for handling.

The plunger pump 200 is an electromagnetically driven positive displacement pump, and as shown in FIG.
0, a plunger 220 slidably reciprocating in the cylinder 210, a yoke 230 fitted to the outer periphery of the cylinder 210, and a bobbin 240a fitted to the outer periphery of the yoke 230. Electromagnetic coil 24
0, an outer case 250 formed of a resin material or the like is provided to cover the outer circumference of the electromagnetic coil 240.

At the upper end of the yoke 230, the end face wall 230
a is formed, and a through hole 23a 'is formed in the central portion thereof to communicate with the outside. A coil sling ring 260a is provided between the end wall 230a and the plunger 220.
Are arranged. In addition, the lower end portion 230 of the yoke 230
b is fitted in the passage forming member 410. A passage member 270 in which a fuel passage 270a having an intake port 270a 'at the lower end is formed is fitted to the passage forming member 410. The passage member 270 holds the poppet valve 280 that opens and closes the fuel passage 270a in a state of being biased in the closing direction by the spring 280a. Then, the passage member 270
A coil spring 260b is arranged between the upper end surface of the coil and the plunger 220.

The passage forming member 410 includes a plunger 22.
A passage member 290 that extends in a direction perpendicular to the reciprocating direction of 0 and forms a fuel passage 290a having a discharge port 290a 'at the tip is fitted. The passage member 290 holds the check valve 300 that opens and closes the fuel passage 290a in a state of being biased in the closing direction by the spring 300a.

The fuel pressure regulator 400 is an inlet control type regulator that adjusts the fuel pressure (fuel pressure) upstream of the injector 4, and is formed as a part of the passage forming member 410 as shown in FIG. Member 29
No. 0 discharge port 290a 'defines a horizontal tubular portion 420a defining a fuel passage 420a, a vertical tubular portion 430 defining a fuel passage 430a communicating with the fuel passage 420a and extending vertically, a fuel passage 420a and a fuel passage 430a. And a regulating valve 440, etc., which is disposed between and to open and close both passages to regulate the pressure of fuel. Horizontal tube 420
As shown in FIG. 7, a check valve 460 that opens and closes the fuel passage 420a is held by the spring 460a in the closing direction. The check valve 460 and the spring 460a form a part of the adjusting valve 440.

As shown in FIG. 7, a fuel passage 420a extending horizontally and a fuel passage 430a extending vertically.
A diaphragm 470 that constitutes a part of the regulating valve 440 is arranged in the intersection space with and. Diaphragm 470
Is a diaphragm body 470a and a spring 470b.
And a cover cap 470c having a through hole 470c '. And the diaphragm body 47
A part of 0a is a needle 460b of the check valve 460.
The check valve 460 is opened against the biasing force of the spring 460a.

A flange member 480 is arranged above the apparatus, and the flange member 480 is, as shown in FIG. 7, a flange portion 481 attached to the fuel tank 1.
A vertical tubular portion 482 that defines the fuel passage 482a and is connected to the vertical tubular portion 430 by fitting, and a connecting portion 48 for connecting the connector of the supply pipe 5 to the fuel passage 482a.
3, a connector 484 for electrical connection, a connecting portion 485 for connecting the filter case 600, and the like. The terminals of the connector 484 are electrically connected to the electromagnetic coil 240 via electrical wiring and a connector (not shown).

As shown in FIG. 7, the filter case 600 is fixed to the connecting portion 485 of the flange member 480 by snap-fit connection. As shown in FIGS. 7 to 10, the filter case 600 is formed in the shape of a cylindrical member having a bottom with a contour. The case body 610 is made of a resin material or the like, and the suction body is insert-molded into the case body 610. It is formed by the filter 500 and the like.

As shown in FIGS. 7 and 8, the case main body 610 is formed with an upper opening 610a at an upper position, and the upper opening 610a extends to the inside of the filter case 600. A filter 620 for preventing invasion of dust and the like is insert-molded. The upper opening 610a is attached to the fuel tank 1,
As shown in FIG. 6, it is positioned so as to open above the liquid surface S. Further, the case body 610
An engaging hole 610b for engaging the claw of the connecting portion 485 is formed in the upper part of the.

As shown in FIGS. 7 and 10, the suction filter 500 includes suction filters 500a and 500b arranged on the lower surface (bottom surface) of the case main body 610, and on the lower side surface as shown in FIGS. The suction filter 500c is arranged. In particular, since the suction filter 500a is provided at a position facing the suction port 270a ', it is possible to reduce the pressure loss near the suction port 270a' and suppress the generation of vapor itself due to the negative pressure. it can. The area of the suction filter 500 provided on the lower surface and the side surface may be increased as necessary, and the case main body 610 may have a skeleton structure and the suction filter 500 may be entirely covered.

Next, the operation of the filter case 600 of this fuel supply system will be described. The operations of the plunger pump 200 and the fuel pressure regulator 400 are the same as those in the above-described embodiment, and thus the description thereof is omitted here. Similar to the above-described embodiment, when the temperature of the fuel in the fuel tank 1 becomes high while the fuel is sucked in and discharged by the plunger pump 200, the lower region of the fuel tank 1 and the lower region of the filter case 600 are heated. In, vapor (air bubbles) is easily generated.

By the way, since the filter case 600 is attached around the main body B of the apparatus with a predetermined space (escape passage), the vapor generated in the filter case 600 does not stay and immediately. The space around the main body B (the escape passage) is lifted, and the upper opening 610a is opened.
From the outside of the filter case 600, that is, the fuel tank 1
It is escaped into the air inside.

In particular, there is nothing that blocks the rise of the vapor around the suction port 270a ', and the vapor generated around the suction port 270a' immediately rises upward and moves away.
Suction of vapor into the suction port 270a 'is suppressed or prevented as much as possible. As a result, even when the fuel is in a high temperature state, the generated vapor is sucked into the suction port 270a ′ by the action of the space (the escape passage) defined by the filter case 600.
The fuel is reliably removed from the surrounding area, stable discharge performance is ensured without a decrease in the flow rate, and the fuel of a predetermined flow rate is stably supplied.

In the above embodiment, the case where the fuel supply device 10, 100 of the present invention is installed in the fuel tank 1 of a two-wheeled vehicle has been shown, but the present invention is not limited to this, and other vehicles such as a three-wheeled vehicle or A small displacement engine and a relatively small fuel tank, such as a cart such as a four-wheeled vehicle, a lawn mower, a general-purpose engine such as a generator, a ship such as a leisure boat, and a snowmobile, are mounted. If it is a vehicle, it can be preferably applied.

[0051]

As described above, according to the fuel supply device of the present invention, the plunger pump reciprocates by the electromagnetic starting force to suck the fuel from the suction port and discharge the fuel from the discharge port, and the downstream of the discharge port. Side, a fuel pressure regulator that opens and closes a fuel passage formed in the main body to adjust the pressure of the fuel, an intake filter attached to cover at least the periphery of the intake port, and a vapor generated inside the intake filter around the intake port. Since it is formed as a module product integrally provided with vapor removing means for removing it away from the fuel cell, the overall size is reduced, and even if vapor is generated in the fuel, desired discharge performance is obtained and stable. Fuel can be supplied. This makes it possible to provide a fuel supply device suitable for being installed in a small fuel tank such as a motorcycle.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a fuel supply system showing a state in which an embodiment of a fuel supply device according to the present invention is installed in a fuel tank.

FIG. 2 is a side view showing an embodiment of a fuel supply device according to the present invention.

FIG. 3 is a side view showing an embodiment of a fuel supply device according to the present invention.

FIG. 4 is a vertical sectional view showing an embodiment of a fuel supply device according to the present invention.

FIG. 5 is a partial vertical cross-sectional view showing an embodiment of a fuel supply device according to the present invention.

FIG. 6 is a schematic view of a fuel supply system showing a state in which another embodiment of the fuel supply device according to the present invention is installed in a fuel tank.

FIG. 7 is a vertical cross-sectional view showing another embodiment of the fuel supply device according to the present invention.

FIG. 8 is a side view showing another embodiment of the fuel supply device according to the present invention.

FIG. 9 is a side view showing another embodiment of the fuel supply device according to the present invention.

FIG. 10 is a bottom view showing another embodiment of the fuel supply device according to the present invention.

[Explanation of symbols]

1 Fuel Tank 2 Engine 4 Injector 5 Supply Pipe 10,100 Fuel Supply Device 20,200 Plunger Pump 22,220 Plunger 23,230 Yoke 24,240 Electromagnetic Coil 29a, 290a Discharge Port 40,400 Fuel Pressure Regulator 41a, 42a, 420a, 430a Fuel passages 44, 440 Control valves 50, 500 (500a, 500b, 500c) Suction filters 53a ', 270a' Suction ports 54a 'Lower end opening 60 Vapor escape pipe 60a Vapor escape passage (vapor removing means) 62 Upper end opening 63 Filter 600 Filter case (vapor removing means) 610 Case body 610a Upper opening 620 Filter B Device body S Liquid level

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Company Tatsuya Ura             2480 Kuno, Odawara-shi, Kanagawa Co., Ltd.             Mikuni Odawara Office

Claims (10)

[Claims] 1. A fuel supply device installed in a fuel tank for supplying fuel to an injector of an internal combustion engine, the main body defining an intake port, a discharge port, and a fuel passage, and an electromagnetic member in the main body. A plunger pump that reciprocates by the starting force to suck the fuel from the suction port and discharge the fuel from the discharge port, and a fuel passage formed in the main body on the downstream side of the discharge port are opened and closed to reduce the fuel pressure. A fuel pressure regulator to be adjusted, an intake filter attached to cover at least the periphery of the intake port formed in the lower portion of the main body, and vapor generated inside the intake filter away from the periphery of the intake port. And a vapor removing unit for removing the vapor. 2. The vapor removing means is a vapor escape passage that extends vertically upward from a lower end opening communicating with the suction filter and opens at an upper end opening at a predetermined position. The fuel supply device according to claim 1. 3. The lower end opening, in the vertical direction,
The fuel supply device according to claim 2, wherein the fuel supply device is positioned above the suction port. 4. The upper end opening is positioned so as to open above the liquid surface of the fuel when installed in the fuel tank. The fuel supply device described. 5. The fuel supply device according to claim 2, wherein a filter is provided in the upper end opening. 6. The filter case is a filter case which is formed so as to surround the main body, integrally includes the suction filter, and has an upper opening portion which opens at a predetermined vertical upper position. The fuel supply device according to claim 1, wherein: 7. The fuel supply device according to claim 6, wherein the suction filter is provided at least on a lower surface and a lower side surface of the filter case. 8. The fuel supply device according to claim 7, wherein the suction filter is provided on a lower surface of the filter case at a position facing the suction port. 9. The method according to claim 6, wherein the upper opening is positioned so as to open above the liquid surface of the fuel when installed in the fuel tank. The fuel supply device as described in 1. 10. The fuel supply device according to claim 6, wherein a filter is provided in the upper opening.