JP2003214276A - Fuel supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To commonly use a fuel supply system installed in a fuel tank of a two-wheeled vehicle or the like. <P>SOLUTION: A pump module 20 consisting of a plunger pump 30 which sucks fuel and forcibly feeds it by electromagnetic impetus and a fuel pressure regulator 50 regulating the fuel pressure forcibly fed, and mounting flange member 80 mounted on the fuel tank 1, are separately formed. These are connected with a connecting member 90 via a mount rubber 71 and also are connected with an elastically deformable fuel passage member 100 and a vapor passage member 110 formed of a rubber hose or the like. Application for the various fuel tanks is realized only by properly changing the connecting member 90, the fuel passage member 100 and the vapor passage member 110. Further, the noise and vibration caused by the plunger pump are also reduced. <P>COPYRIGHT: (C)2003,JPO

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 fuel temperature 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. In such a case as well, It is necessary to secure a desired fuel discharge performance and supply a stable fuel. Further, since various types of fuel tanks having different depths or outer contours are set according to the vehicle type, it is necessary to be applicable to any type. In addition, it is necessary to reduce vibration, noise, etc. due to the drive source for fuel supply.

The present invention has been made in view of the above points, and it is an object of the present invention to reduce the size, simplify the structure, improve the functional reliability, and ensure the stable fuel discharge performance. An object of the present invention is to provide a fuel supply device which is suitable for vehicles such as a two-wheeled vehicle equipped with a small displacement engine, in which parts are shared and vibration and noise are reduced.

[0006]

A fuel supply device of the present invention is a fuel supply device installed in a fuel tank for supplying fuel toward an injector of an internal combustion engine, which reciprocates by an electromagnetic starting force. And a fuel pump having a fuel pressure regulator having a discharge part for adjusting and discharging the pressure of the fuel to be pumped, and a fuel passage part for defining a fuel passage. And a mounting flange member that is mounted on the fuel tank, a coupling member that detachably connects the pump module and the mounting flange member, and a fuel passage member that detachably connects the discharge portion and the fuel passage portion to communicate with each other. It is characterized by having. According to this configuration, the pump module and the mounting flange member are detachably connected to each other via the connecting member and the fuel passage member, so that the device can be installed in different types, for example, fuel tanks having different depths and mounting portions. When applied, it can be dealt with only by changing the connecting member, the fuel passage member, and the mounting flange member, and a common pump module can be applied. Further, when applied to fuel tanks having different depths, it can be dealt with by simply changing the connecting member and the fuel supply member, and a common pump module and mounting flange member can be applied.

In the above structure, the suction filter has a discharge portion for discharging the vapor generated therein, and the mounting flange member has a vapor passage portion which opens the fuel tank while allowing the vapor to pass therethrough. It is possible to employ a configuration having a vapor passage member that detachably connects the portion and the vapor passage portion to communicate with each other. With this configuration, the vapor generated in the suction filter can be guided upward through the vapor passage member and discharged through the opening to the upper space in the fuel tank through the vapor passage portion formed in the mounting flange member. Further, since the vapor passage member is attachable / detachable to / from the mounting flange member and the pump module (exhaust portion of the intake filter), it is possible to change the vapor passage member even for different types of fuel tanks. A common pump module and even a common mounting flange member can be used.

In the above structure, the pump module and the mounting flange member are connected via an elastic body.
Configuration can be adopted. According to this configuration, vibration, noise, and the like caused by the pump module are blocked by the elastic body (that is, the soft mount structure), and the transmission to the mounting flange member is suppressed or prevented. As a result, it is possible to reduce vibration and noise transmitted to the outside.

In the above structure, the fuel passage member may be made of a resin material so as to be elastically deformable. According to this structure, the fuel passage member interposed between the mounting flange member and the pump module is made of an elastically deformable resin material (for example, a rubber hose), so that the fuel passage member also blocks vibration and noise. Function as an elastic body. As a result, the vibration and noise transmitted to the outside can be further reduced.

In the above structure, the vapor passage member may be made of a resin material so as to be elastically deformable. With this configuration, the vapor passage member interposed between the mounting flange member and the pump module (the discharge portion of the suction filter) is elastically deformable resin material (for example,
Since it is formed of a rubber hose or the like), this vapor passage member also functions as an elastic body that blocks vibration and noise.
As a result, the vibration and noise transmitted to the outside can be further reduced.

In the above structure, the pump module is
It is possible to adopt a configuration in which a connecting portion for connecting to the connecting member is provided, and the connecting portion is fixed to the pump module via an elastic member. According to this structure, since the elastic member (elastic body) for blocking vibration and noise is integrally assembled to the pump module, it is possible to change to different fuel tanks only by changing the connecting member. Can be easily attached, and at the same time as assembling, functions such as anti-vibration can be secured.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4
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. 1 and 2, the fuel supply device 10 includes a pump module 20, a mounting flange member 80 mounted on the fuel tank 1, and a pump module 20.
And a fuel passage member 100, a vapor passage member 110, and the like.

As shown in FIGS. 2 and 3, the pump module 20 adjusts the pressure of the fuel pumped from the plunger pump 30, which reciprocates by electromagnetic starting force to suck and pump the fuel. The fuel pressure regulator 50 that discharges the fuel, the suction filter 60 that is attached to the lower portion of the plunger pump 30, the connecting portion 70, and the like are integrally formed and formed.

The plunger pump 30 is an electromagnetically driven positive displacement pump, and as shown in FIG. 3, a cylinder 31, a plunger 32 inserted so as to slide linearly in the cylinder 31, and reciprocate linearly. A yoke 33 fitted around the outer circumference of 32, and a bobbin 3 fitted around the outer circumference of the yoke 33
An excitation coil 34 wound around 4a, and an outer case 3 formed of a resin material or the like so as to cover the outer circumference of the coil 34.
It has 5 etc.

An end wall 33a is formed at the upper end of the yoke 33, and a through hole 33a 'is formed in the center of the end wall 33a to communicate with the outside. A coil spring ring 36a is arranged between the end wall 33a and the plunger 32. Further, the lower end portion 33b of the yoke 33 is fitted into the passage forming member 37.

The passage forming member 37 is fitted with a passage member 38 in which a fuel passage 38a having an intake port 38a 'at its lower end is formed. The passage member 38 holds a poppet valve 39 that opens and closes the fuel passage 38a in a state of being biased in the closing direction by a spring 39a. And the passage member 3
A coil spring ring 36b is arranged between the upper end surface of the valve 8 and the plunger 32.

In the passage forming member 37, a passage extending in a direction perpendicular to the reciprocating direction of the plunger 32 and forming a fuel passage 40a having a plurality of discharge ports 40a 'formed in a notched groove on the side surface is formed. The member 40 is fitted. The passage member 40 holds a check valve 41 that opens and closes the fuel passage 40a in a state of being biased in a closing direction by a spring 41a. In the passage member 40,
The circular hole formed at the downstream end of the check valve 41 is
It serves to remove air from the space containing the spring 41a.

The fuel pressure regulator 50 includes the injector 4
Is an inlet control type regulator that adjusts the fuel pressure (fuel pressure) upstream of the passage, and is formed as a part of the passage forming member 37 and communicates with the discharge port 40a 'of the passage member 40 as shown in FIG. A horizontal tubular portion 51 that defines the fuel passage 51a, a vertical tubular portion 52 that serves as a discharge portion that defines a fuel passage 52a that communicates with the fuel passage 51a and extends vertically, and is disposed between the fuel passage 51a and the fuel passage 52a. It is provided with a pressure receiving operation unit 53 and the like for opening and closing both passages to adjust the fuel pressure.

As shown in FIG. 3, a check valve 54 for opening and closing the fuel passage 51a is held in the horizontal tubular portion 51 in a state of being biased in a closing direction by a spring 54a. The check valve 54 and the spring 54a
Also functions to adjust the fuel pressure. The vertical tubular portion 52 as a discharge portion forms a connector pipe for connecting the fuel passage member 100.

As shown in FIG. 3, a pressure receiving operation portion 53 is arranged in an intersecting space between a fuel passage 51a extending horizontally and a fuel passage 52a extending vertically. The pressure receiving operation portion 53 is formed by a center disk 53a, a spring 53b, and a cover cap 53c having a through hole. Then, a part of the center disk 53a comes into contact with the needle 54b of the check valve 54,
Check valve 54 against the biasing force of spring 54a
Is designed to be opened.

The suction filter 60 is formed in a flat shape with a substantially rectangular outline, and as shown in FIG. 3, the mesh-shaped filter body 61 and the filter body 61 are connected to the lower end portion of the passage forming member 37. And a discharge section 63 connected to the vapor passage member 110.

The connecting portion 70 is formed of a mount rubber 71 as an elastic member (elastic body), a connecting bracket 72 formed so as to surround the mount rubber 71, and the like. The mount rubber 71 covers the upper end portion of the yoke 33, has a through hole 71a, and has an elastic characteristic of absorbing or blocking vibration and noise generated by the reciprocating movement of the plunger 32. Connecting bracket 7
2 is fixed to the mount rubber 71, has a through hole 72a in its upper surface, and has a screw hole 72b 'for connecting to the connecting member 90 on a protruding piece 72b protruding from the upper surface.

As shown in FIG. 4, the mounting flange member 80 has a flange portion 81 attached to the fuel tank 1, a pipe connector 82 projecting outside the flange portion 81 for connecting the supply pipe 5, and a plunger pump 30. Electrical connector 8 for making electrical connection to coil 34
3, the hanging piece 8 protruding downward from the flange portion 81
4, a connection pipe 85, and a connection pipe portion 86.

The hanging piece 84 is for connecting the connecting member 90 and has a screw hole 84a. The connection pipe 85 is for connecting the fuel passage member 100, and forms a fuel passage portion that defines the fuel passage 85a. The connection pipe 86 is for connecting the vapor passage member 110, and is connected to the fuel passage 86 a and the fuel tank 1.
A vapor passage portion that defines an opening 86b that opens to the inner space (air layer) is formed. Here, a filter 87 is provided near the opening 86b to prevent dust and the like from entering the fuel passage 86a.

As shown in FIG. 2, the connecting member 90 includes the hanging piece 84 of the mounting flange member 80 and the pump module 20.
And is formed by a sheet metal press-molded product, a resin material mold-formed product, or the like. The connecting member 90 includes the hanging piece 84 and the connecting bracket 7.
The second projecting piece 72b is detachably connected with a fastening screw 91 or the like. Here, the connecting bracket 72
Since the mount rubber 71 as an elastic body is interposed between the plunger 32 and the plunger pump 30, the plunger 32
The mount rubber 71 absorbs or attenuates (blocks) vibrations, noises, and the like due to the reciprocating motion of the, and the transmission to the connecting member 90 is prevented or suppressed.

As shown in FIG. 2, the fuel passage member 100 is for connecting the connecting pipe 85 of the mounting flange member 80 and the vertical cylinder portion (discharging portion) 52 of the pump module 20, and is made of a resin material or the like. Is formed so as to be elastically deformable. For example, a rubber hose or the like is applied. The fuel passage member 100 is detachably connected by being fitted into the connection pipe 85 and the vertical tubular portion 52. At the time of connection, a clamp or the like for tightening the outer periphery of the fuel passage member 100 may be employed to reliably prevent the fitting portion from falling off. Here, since the fuel passage member 100 is elastically deformable, it also serves as an elastic body that absorbs or attenuates vibrations, noises, etc., and vibrations, noises, etc. due to the plunger pump 30 are attached to the mounting flange member 8
Effectively prevent or suppress the transmission to zero.

The vapor passage member 110 is, as shown in FIG. 2, the discharge portion 6 formed in the connection pipe 86 of the mounting flange member 80 and the suction filter 60 of the pump module 20.
It is for connecting with 3 and is made elastically deformable by using a resin material or the like. For example, a rubber hose or the like is applied. Then, the vapor passage member 110 is detachably connected by being fitted to the connection pipe 86 and the discharge portion 63. At the time of connection, a clamp or the like for tightening the outer periphery of the vapor passage member 110 may be employed to reliably prevent the fitting portion from falling off. Here, since the vapor passage member 110 is elastically deformable, it also serves as an elastic body that absorbs or attenuates vibrations and noises, and the vibrations and noises caused by the plunger pump 30 are transmitted to the mounting flange member 80. Effectively prevent or suppress.

Next, the operation of this fuel supply system will be described. First, by energizing the coil 34, the plunger 32 moves upward in the reciprocating direction against the biasing force of the coil springs 36a and 36b. At the same time, the poppet valve 39 is opened against the biasing force of the spring 39a due to the pressure difference, and the fuel is sucked from the suction port 38a 'and flows into the space V1. Then, when the electromagnetic force and the biasing forces of the coil springs 36a and 36b are balanced, the plunger 32 stops.

When the power supply to the coil 34 is cut off, the coil springs 36a and 36b are urged by the urging force.
The plunger 32 moves downward to compress the fuel in the space V1. Then, when the fuel is compressed to exceed the predetermined pressure, the check valve 41 opens against the biasing force of the spring 41a, and the compressed fuel is discharged from the discharge port 40a '.

In the above operation, the basic operation when the plunger 32 reciprocates once has been described. In the normal operation, the electromagnetic force generated by the duty control of the energization of the coil 34 and the coil Spring 36a,
The plunger 32 is continuously reciprocated by the interaction of the urging force of 36b in the return direction, and a predetermined volume of fuel corresponding to the moving stroke thereof is continuously sucked into the intake port 38a '.
Is discharged from the discharge port 40a 'at a predetermined pressure.

Further, in the fuel passages 51a, 52a on the downstream side of the discharge port 40a ', the fuel pressure regulator 50
In the case where the pressure receiving operation portion 53 of the above acts and the pressure in the fuel passage 52a or the diaphragm C is equal to or higher than a predetermined pressure,
The check valve 54 closes the fuel passage 51a by the urging force of the spring 54a. In this state, when the pressure of the fuel in the fuel passage 52a becomes equal to or lower than a predetermined level, the center disc 53a is actuated by the biasing force of the spring 53b to press the needle 54b and open the check valve 54. As a result, the fuel on the upstream side of the fuel passage 51a flows into the diaphragm C and is guided to the fuel passage 52a. Then, when the pressure of the fuel in the fuel passage 52a becomes equal to or higher than a predetermined level, the pressure causes the pressure receiving operation unit 53 to operate and closes the check valve 54.

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 6
Inside 0, vapor (air bubbles) is easily generated.
Then, the generated vapor immediately passes through the vapor passage member 110 without staying inside, and is released into the air in the fuel tank 1 through the opening 86b. As a result, even if the fuel is in a high temperature state, stable discharge performance is ensured without a decrease in the flow rate, and the fuel of a predetermined flow rate is stably supplied.

Next, the assembly of the fuel supply system will be described. As shown in FIG. 2, this device includes a pump module 20, a mounting flange member 80, a connecting member 90,
The fuel passage member 100 and the vapor passage member 110 are assembled together. Therefore, the connecting member 90, the fuel passage member 100, and the vapor passage member 110 having a length corresponding to the depth H of the fuel tank 1 are prepared in advance. Then, by assembling the respective parts, a device as shown in FIG. 2 is completed. After that, the lower portion of the mounting flange member 80 (pump module 20, etc.) is inserted into the fuel tank 1, and the fuel tank 1
The mounting to the fuel tank 1 is completed by fixing the mounting flange member 80 to the mounting portion.

Therefore, for various fuel tanks 1 having different depths H, the connecting member 90 and the fuel passage member 10 are provided.
By changing only 0 and the vapor passage member 110,
This device can be applied. That is, since the common pump module 20 and the mounting flange member 80 can be applied to various fuel tanks 1, the cost can be reduced by sharing the parts.

FIG. 5 shows a fuel tank 1'with an inclined mounting portion.
On the other hand, an embodiment to which the fuel supply device according to the present invention is applied is shown. As shown in FIG. 5, this device 10 'includes a pump module 20 and a mounting flange member 80 which are the same as those in the above-described embodiment, a connecting member 90' having a length and shape different from those in the above-described embodiment, and a fuel passage member 100. ´ 、
It is formed by the vapor passage member 110 '.

That is, the connecting member 90 ', the fuel passage member 100', and the vapor passage member 110 'are formed in a substantially V-shape in a shape corresponding to the inclination of the mounting portion. As described above, even in the fuel tank 1 ′ of which the mounting portion is inclined, a component that connects the pump module 20 and the mounting flange member 80 (connecting member 90
′, Fuel passage member 100 ′, vapor passage member 110 ′)
Can be applied by simply changing

In the above embodiment, the suction filter 6
Vapor passage member 1 for releasing vapor generated in 0
In the configuration adopting 10, 110 ', the pump module 20 and the mounting flange member 80 are detachably connected, but the configuration is not limited to this, and the vapor passage members 110, 110' are eliminated. In the configuration, the pump module 20 and the mounting flange member 80 may be detachably connected.

Further, in the above embodiment, the connecting members 90 and 90 ', the fuel passage members 100 and 100', and the vapor passage members 110 and 110 'are independently formed, but the present invention is not limited to this. , The connecting member, the fuel passage member, and the vapor passage member are integrally formed as a connecting and passage member, and the mount as an elastic body is provided between the connecting and passage member and the mounting flange member 80 or between the pump module 20. You may employ | adopt the structure which interposes rubber. Further, although the fastening screw 91 is used to connect the connecting members 90 and 90 ′, the present invention is not limited to this.
Instead of using the fastening screws 91, they may be connected by snap fit coupling or the like.

Further, in the above embodiment, the case where the fuel supply device 10, 10 'is installed in the fuel tank 1, 1'of the two-wheeled vehicle has been shown, but the present invention is not limited to this, and other vehicles, For example, carts such as three-wheeled vehicles or four-wheeled vehicles, general-purpose engines such as lawn mowers and generators, ships such as leisure boats, and even small-displacement engines and relatively small fuel tanks such as snowmobiles. If the vehicle is mounted, it can be preferably applied.

[0041]

As described above, according to the fuel supply system of the present invention, the pump module and the mounting flange member are separately formed, and the vapor passage is further provided by the detachable connecting member and the fuel passage member. By adopting a structure in which the members can be connected, it is possible to apply to various types of fuel tanks of different types. As a result, the parts can be shared and the cost can be reduced. Further, by interposing an elastic body that absorbs or attenuates vibrations or noises in a part of the connecting members, it is possible to prevent or suppress the transmission of vibrations or noises caused by the plunger pump to the outside.

[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 a pump module constituting a part of the fuel supply device according to the present invention.

FIG. 4 is a side view showing a mounting flange member that constitutes a part of the fuel supply device according to the present invention.

FIG. 5 is a side view showing another embodiment of the fuel supply device according to the present invention.

[Explanation of symbols]

1 fuel tank 2 engine 4 injectors 5 supply pipes 10,10 'Fuel supply device 20 pump modules 30 Plunger pump 50 Fuel pressure regulator 52 Vertical cylinder part (discharge part) 53 Pressure receiving part 53a Center disk 60 Inhalation filter 61 Filter body 63 Discharge part 70 Connection 71 Mount rubber (elastic member, elastic body) 72 Connection bracket 72b protruding piece 80 Mounting flange member 81 Flange 84 hanging piece 85 Connection pipe (fuel passage) 86 Connection pipe (vapor passage) 86b opening 90, 90 'connecting member 91 Fastening screw 100,100 'Fuel passage member (elastic body) 110, 110 'Vapor passage member (elastic body)

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) F02M 69/00 340 F02M 69/00 340T

Claims (6)

[Claims] 1. A fuel supply device installed in a fuel tank for supplying fuel toward an injector of an internal combustion engine, the plunger reciprocating by an electromagnetic starting force to suck and pump the fuel through an intake filter. A pump module including a pump and a fuel pressure regulator having a discharge portion for adjusting and discharging the pressure of fuel to be pumped; a mounting flange member having a fuel passage portion defining a fuel passage and attached to the fuel tank; A connecting member that detachably connects the pump module and the mounting flange member, and a fuel passage member that detachably connects the discharge portion and the fuel passage portion to communicate with each other. Fuel supply device. 2. The suction filter has a discharge portion for discharging the vapor generated inside, and the mounting flange member has a vapor passage portion that opens the fuel tank while allowing the vapor to pass therethrough. 2. The fuel supply device according to claim 1, further comprising a vapor passage member that detachably connects the discharge portion and the vapor passage portion to communicate with each other. 3. The fuel supply device according to claim 1, wherein the pump module and the mounting flange member are connected via an elastic body. 4. The fuel supply device according to claim 1, wherein the fuel passage member is formed of a resin material so as to be elastically deformable. 5. The fuel supply device according to claim 2, wherein the vapor passage member is formed of a resin material so as to be elastically deformable. 6. The pump module has a connecting portion for connecting to the connecting member, and the connecting portion is fixed to the pump module via an elastic member. The fuel supply device according to claim 3.