JP2001123919A - Fuel supply device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect fuel supply instruments provided by uniting with a throttle body from a muddy water, dust and outside shock and fix them surely and improve their installation/removal workability. SOLUTION: In this fuel supply device 12, a fuel supply pump 61, fuel filter 62, pressure adjuster 63 and electronic control device 64 are united with respect to the throttle body including an intake passage and a throttle valve. This device 12 is integrally formed with the throttle body and a body case 27 for storing and fixing respective instruments 61-64 is provided in its inside. The body case 27 includes opening parts 38, 58 for putting in/out respective instruments 61-64 in its inside, recessed parts 65-67 for inserting respective instruments 61-64 in its inside and cover members 39, 37 for closing respective openings 65-67.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine used for a vehicle such as a motorcycle, for example, and to a fuel supply device for an engine for supplying fuel together with air to a combustion chamber of the engine.

[0002]

2. Description of the Related Art Conventionally, as a fuel supply device used for a motorcycle, for example, there is a fuel supply device using a fuel injection device. This type of fuel injection device includes a throttle body including an intake passage, a fuel injection valve that injects fuel into the intake passage, a fuel pump that supplies fuel to the fuel injection valve under pressure, and a fuel pressure that is supplied to the fuel injection valve. And a fuel filter that removes foreign matter in the supplied fuel. Here, there is a fuel pump in which a fuel pump and a pressure regulator are built in a fuel tank.

However, when the fuel pump and the pressure regulator are built in the fuel tank, those devices must be inserted into the fuel tank or fixed. For this reason, as a motorcycle fuel tank that emphasizes the appearance, the degree of freedom in design is limited because of the provision of a fixing portion for both devices, and the workability of mounting both devices to the fuel tank is also good. Did not. Further, in order to secure a space for accommodating both devices, the fuel tank tends to be large. Furthermore, since the fuel pump is provided in the fuel tank arranged near the driver, the noise of the fuel pump tends to be worrisome especially during idling operation. On the other hand, for maintenance, both devices had to be removed from the fuel tank, and this workability was not good.

[0004] Therefore, a fuel injection device has been proposed which aims to solve the above-mentioned problems, to enable the conventional multiple carburetor to be disposed in the accommodation space in a motorcycle, and to improve the mounting workability and maintenance workability. JP-A-10-1221
No. 01 was proposed.

[0005] As shown in FIG. 13, the fuel injection device disclosed in this publication has a fuel distribution section on one side of a multiple throttle body 82 having a plurality of intake passages 81 in which a throttle valve (throttle valve) 80 is disposed. The fuel supply unit 84 is fixedly arranged on the other side of the body 82 with the fuel supply unit 84 arranged and fixed. The fuel distribution unit 83 includes a fuel distribution pipe 85 and a fuel injection valve 86. The fuel supply unit 84 includes a fuel storage chamber 87, a fuel pump 88, a fuel filter 89, a pressure regulator, and the like. As described above, the above object is achieved by unitizing the multiple throttle body 82, the fuel distribution unit 83, and the fuel supply unit 84.

[0006]

However, the fuel injection device disclosed in the above-mentioned publication has the following problems in arranging and fixing the fuel supply portion 84 to the multiple throttle body 82. That is, in the fuel injection device, each of the fuel storage chamber 87, the fuel pump 88, the fuel filter 89, the pressure regulator, and the like constituting the fuel supply unit 84 is connected to one side of the throttle body 82 via the base member. Alternatively, they are simply fastened and fixed directly via a band and a screw (both not shown).
And the like are mostly exposed to the outside. The unitization here simply means that each of the devices 87 to 89 constituting the fuel supply unit 84 with respect to the multiple throttle body 82,
It is simply arranged in series along the longitudinal direction of the body 82 and fixed via bands, screws, and the like, and is merely a unitization in arrangement.

For this reason, since most of the devices 87 to 89 are physically exposed to the outside, measures such as waterproofing and dustproofing are insufficient, and protection against external impact is also insufficient. Had become something. Moreover, each of the devices 87 to 89
Are simply fixed individually to the throttle body 82 via a band, a screw, and the like. In particular, in a motorcycle, the unitized devices 87 to 89 and the like are often attached to the vehicle body in a state where they are exposed to the outside. Even if those devices 87 to 89 and the like are secondarily covered with a cover, There is a possibility that muddy water or dust may enter through the gap between the covers and adhere to the devices 87 to 89, and the effect of the secondary cover cannot be expected much. Further, the fixing work such as the mounting of the band or the screw or the tightening of the screw has to be performed individually for each of the devices 87 to 89 and the like, and the work of attaching and detaching has been troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reliably protect fuel supply equipment provided as a unit with a throttle body while properly protecting the fuel supply equipment from muddy water, dust, and external impact. An object of the present invention is to provide a fuel supply device for an engine that can be fixed and that can improve the workability of attachment and detachment to and from a throttle body.

[0009]

According to one aspect of the present invention, there is provided an apparatus for supplying fuel to a throttle body including an intake passage and a throttle valve provided in the intake passage. A fuel supply device for an engine provided integrally with a throttle body, and a body case for housing and fixing a fuel supply device therein, and a body case for supplying fuel therein. The object is to include an opening for taking in and out the device, a concave portion for fitting the fuel supply device therein, and a lid member for closing the opening.

[0010] According to the configuration of the present invention, the fuel supply device is easily inserted into the recess through the opening of the body case provided integrally with the throttle body, and is fitted into the recess. Positioned. Then, by simply closing the opening with a lid member and fixing the lid member, the fuel supply device is housed and fixed inside the body case in a state covered by the body case. On the other hand, to remove the fuel supply device from the body case, it is sufficient to simply remove the lid member and open the opening.

[0011] In order to achieve the above object, the invention according to claim 2 is characterized in that, in the structure of the invention according to claim 1, the throttle body and the body of the body case are integrally formed of resin. I do.

According to the structure of the present invention, in addition to the effect of the first aspect, since the throttle body and the body of the body case are integrally formed of resin, the processing becomes relatively easy and the weight is reduced. Becomes possible.

[0013] To achieve the above object, according to a third aspect of the present invention, in the configuration of the first or second aspect, the fuel supply device includes at least a fuel pump and a pressure regulator. It is intended.

According to the configuration of the present invention, at least the fuel pump and the pressure regulator are unitized with respect to the throttle body in addition to the operation of the invention according to the first or second aspect. Since it can be handled integrally with the body, a structure for fixing these to another member such as a fuel tank is not required.

According to a fourth aspect of the present invention, there is provided a vehicle as defined in the third aspect, wherein the body case has a fitting recess corresponding to the fuel pump therein, And a power supply terminal provided adjacent to the concave portion, wherein the electrode terminal provided on the fuel pump is connected to the power supply terminal when the fuel pump is fitted into the concave portion.

According to the structure of the present invention, in addition to the function of the third aspect of the invention, since the fuel pump is fitted into the recess of the body case, the electrode terminal of the pump is connected to the power supply terminal. In addition, the trouble of wiring connection for the fuel pump is omitted.

According to a fifth aspect of the present invention, there is provided a fuel cell system comprising: a body case for introducing fuel from a fuel tank; It is intended to include an inlet, a fuel passage through which fuel introduced from the fuel inlet flows to the fuel pump, and a fuel outlet through which excess fuel generated by the pressure regulator is returned to the fuel tank.

According to the configuration of the present invention, in addition to the function of the third or fourth aspect, the body case is provided with a fuel inlet, a fuel outlet, and a fuel passage relating to the fuel pump and the pressure regulator. In addition, the handling of the fuel pipe is simplified.

According to a sixth aspect of the present invention, there is provided a fuel injection valve according to any one of the first to fifth aspects, wherein the fuel injection valve is provided adjacent to the throttle body. The fuel supply port for supplying fuel to the fuel injection valve is provided in the body case.

According to the configuration of the present invention, in addition to the operation of the invention according to any one of claims 1 to 5, the fuel supply of the body case to the fuel injection valve provided adjacent to the throttle body is provided. Since the fuel is supplied from the mouth, the fuel injection valve can be provided directly on the body case integrated with the throttle body. By providing the fuel injection valve in association with the intake passage of the throttle body, the throttle body, the fuel supply device, and the fuel injection valve are assembled.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the "fuel supply device for an engine" of the present invention is embodied in an engine of a small motorcycle will be described in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of an engine 11 and a unitized fuel supply device 12. Engine 11
Includes a cylinder block 13 and a cylinder head 14. The cylinder block 13 includes a piston 15, a connecting rod 16, and a crankshaft 1 connected to each other.
7 and the like are provided. The cylinder head 14 is provided with a combustion chamber 18
Port 19 and port 1 for inhaling a combustible mixture
An intake valve 20 that opens and closes 9, an exhaust port 21 that discharges combustion gas from the combustion chamber 18, an exhaust valve 22 that opens and closes the port 21, and a valve mechanism 23 that opens and closes both valves 20, 22 are provided.

In this embodiment, the fuel supply device 1
2 is for supplying a combustible mixture of air and fuel to the intake port 19. The fuel supply device 12 includes an intake passage 24 and a throttle valve 25 provided in the intake passage 24.
And a body case 27 for unitizing and providing a plurality of fuel supply devices to the body 26. Throttle body 26
The body case 27 and the body case 27 are integrally formed of resin. A resin intake manifold 28 is connected to an outlet 24 a of the intake passage 24, and the intake passage 24 is connected to the intake port 19 via the manifold 28.

FIG. 2 is a front view of the throttle body 26 of the fuel supply device 12. 3 shows a top view of FIG. 2, and FIG. 4 shows a cross-sectional view taken along line 4-4 of FIG. The throttle valve 25 is a piston valve that moves vertically with respect to the intake passage 24. A cylinder 29 vertically communicating with the intake passage 24 is integrally formed with the throttle body 26, and the throttle valve 25 is slidably incorporated in the cylinder 29. In the opening of the cylinder 29,
The lid 32 is attached. A spring 30 provided on the throttle valve 25 urges the throttle valve 25 in a direction in which the intake passage 24 is closed. Throttle valve 2
The wire 31 connected to 5 is connected to a handle (not shown) operated by the driver. The wire guide 32 a formed integrally with the lid 32 is for guiding the wire 31. When the wire 31 is pulled, the throttle valve 25 moves in a direction to open the intake passage 24 against the urging force of the spring 30. As a result, outside air is taken into the intake passage 24.

A bypass passage 33 bypassing the throttle valve 25 is formed in the throttle body 26 in association with the intake passage 24. Similarly, the throttle body 26 has an idle speed control valve (IS
(C valve) 34 is fixed by heat caulking. This IS
The C valve 34 is electrically controlled to open and close the bypass passage 33. When the throttle valve 25 is fully closed, that is, when the engine 11 is idling, the ISC
By controlling the valve 34, the amount of intake air supplied to the engine 11 is finely adjusted.

At a position adjacent to the outlet 24a of the intake passage 24, a fuel injection valve (injector) 35 is provided.
That is, the injector 35 is mounted in the mounting hole 28a formed near the inlet of the intake manifold 28. This injector 35 is electrically controlled so that
The fuel is injected into the passage of the intake manifold 28. And, from the intake passage 24, the intake manifold 28
When fuel is injected from the injector 35 into the air flowing into the combustion chamber, a combustible mixture of the air and the fuel is formed, and the combustible mixture is taken into the combustion chamber 18 at a timing when the intake valve 20 is opened. It is.

FIG. 5 is a rear view of FIG. 2, showing a front surface of the body case 27. FIG. 6 shows a left side view of FIG. FIG. 7 is a sectional view taken along line 7-7 in FIG. 6, and FIG. 8 is a partial sectional view taken along line 8-8 in FIG. FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. As shown in FIGS. 5 and 6, the body case 27 includes a case body 36, a lower cover 37 fixed to the lower surface of the case body 36, and a first case formed on a side surface of the case body 36, as can be seen from the appearance. Opening 38, a plug 39 for closing the opening 38, and a case body 36
Opening 40 formed in the front surface of the
The case body 36 includes a front cover 41 for closing the cover 0 and a connector 43 for electric wiring provided on a side surface of the case body 36. The plug 39 is formed of a resin and includes an outlet pipe 39a integrally formed as a fuel outlet. Similarly, the lower cover 37 is formed of resin, and includes an inlet pipe 37a integrally formed as a fuel inlet. FIG.
As shown in the figure, the inlet pipe 37a and the outlet pipe 39a are connected to a fuel tank 44 provided on a motorcycle via pipes 45 and 46. The inlet pipe 37a is for introducing fuel from the fuel tank 44 into the body case 27. The outlet pipe 39a is for taking out fuel from the body case 27. Here, in the motorcycle, the inlet pipe 37a is connected to the outlet pipe 39.
a.

As shown in FIGS. 7 and 8, a fuel pump 61, a fuel filter 62, a pressure regulator 63, and an electronic control unit (ECU) 64 are fixedly housed inside the case body 36 as a fuel supply device. . The above equipment 6
1 to 63 have a substantially cylindrical shape. The ECU 64 has a box shape.
As shown in FIG. 7, the fuel filter 62 and the pressure regulator 63 are caulked together and integrated. The integrated fuel filter 62 and pressure regulator 63 and the fuel pump 61 are arranged so as to be orthogonal to each other. In this arrangement, the discharge port 6 of the fuel pump 61
1a is fitted into the inlet 62a of the fuel filter 62 in an uneven relationship and is directly connected. This connection is sealed by an O-ring (not shown).

Here, the fuel pump 61 is connected to the fuel tank 4
4 for discharging the fuel from the fuel cell 4 at a high pressure, and is electrically driven. The fuel filter 62 includes a fuel pump 61
This is for removing foreign substances contained in the fuel discharged from the fuel tank. The pressure regulator 63 is for adjusting the fuel pressure discharged from the fuel pump 61 to a predetermined level, and excess fuel generated by this adjustment is led out through the outlet pipe 39a. The ECU 64
This is for controlling the injector 35 for fuel injection control. The ECU 64 has a built-in pressure sensor (not shown). The case body 36 includes the injector 35
A fuel supply port 57 for supplying fuel to the fuel cell. on the other hand,
The lower cover 37 is provided with a fuel passage 37b for flowing the fuel introduced from the inlet pipe 37a to the fuel pump 61.
And a projection 37c for engaging with the lower surface of the fuel pump 61 to press the pump 61.

Accordingly, by driving the fuel pump 61, the body case 27 is moved from the inlet pipe 37a.
The fuel that was introduced to The fuel is sucked from the suction port 61b of the fuel pump 61 through the fuel passage 37b. The fuel that is pressurized by the fuel pump 61 and discharged from the discharge port 61 a is purified by the fuel filter 62, pressure-adjusted by the pressure regulator 63, and supplied from the fuel supply port 57 to the injector 35. Excess fuel generated by the pressure regulator 63 is led out of the outlet pipe 39a.

FIG. 10 is a sectional view of only the body case 27. FIG. 11 is a cross-sectional view of the throttle body 26 and the body case 27. As shown in FIG. 10, the case main body 36 has a first concave portion 65 and a second concave portion 66 having a shape matching the outer shape of each of the devices 61 to 64 therein.
And a third recess 67. The first opening 38 is for taking the integrated fuel filter 62 and the pressure regulator 63 into and out of the first recess 65. Similarly, the case body 36 includes a third opening 58 on the lower surface thereof for inserting and removing the fuel pump 61.

As shown in FIGS.
Includes a power supply terminal 70 arranged adjacent to a part of the third recess 67. The power supply terminal 70 is connected to the fuel pump 6.
By fitting 1 into the third recess 67, it is connected in alignment with the electrode terminal 71 provided in the pump 61. In addition, an ECU 64 is provided in the second concave portion 66.
The electrode terminals 72 connected to the electrode terminals (not shown) are provided in advance.

As shown in FIG. 11, the case body 36 is
The pipe cap 73 is integrally formed. The pipe cap 73 is provided with a fuel passage 73a communicating with the fuel supply port 57.
Having. As shown in FIG.
Is the injector 3 mounted on the intake manifold 28.
5, and for flowing the fuel supplied to the fuel supply port 57 to the injector 35. The pipe cap 73 is provided with a wiring 74 connected to the electrode terminal of the injector 35 in advance.

Therefore, in order to house and fix these devices 61 to 64 inside the body case 27, first, the fuel filter 62 and the pressure regulator 63 are inserted into the case body 36 through the first opening 38. Then, they are fitted into the first recess 65. Thereafter, the plug 39 is fixed to the first opening 38 so that
To close. Here, hot plate welding can be employed to fix the plug 39. Next, the fuel pump 61 is inserted into the case main body 36 through the third opening 58, and the pump 61 is fitted into the third recess 67. At the same time, the discharge port 61a of the fuel pump 61 is fitted and connected to the introduction port 62a of the fuel filter 62, and the electrode terminal 71 of the pump 61 is connected to the power supply terminal 70.
Thereafter, the third opening 58 is closed by fixing the lower cover 37 to the lower surface of the case body 36. Also in this case, hot plate welding can be employed to fix the lower cover 37. In this fixed state, the protrusion 37c of the lower cover 37 presses the lower surface of the fuel pump 61, so that the fuel pump 61 is firmly held. Next, the ECU 64 is fitted into the second concave portion 66 through the second opening 40, and the electrode terminal of the ECU 64 is connected to the corresponding electrode terminal 7.
2 and so on. After that, by fixing the front cover 41 to the front surface of the case body 36, the second opening 6
40 is closed. Also in this case, hot plate welding can be employed to fix the front cover 41. In this embodiment, the plug 39, the front cover 41, and the lower cover 37 are respectively provided with corresponding first to third openings 39,
This is for closing 40 and 58 and each corresponds to a lid member of the present invention.

As described above, according to the configuration of the fuel supply device 12, the fuel pump 61 as a fuel supply device,
Fuel filter 62, pressure regulator 63 and E
The CU 64 is provided with first to third openings 38, 40, 58 of the body case 27 integrally formed with the throttle body 26.
Corresponding to the first to third recesses 6
Fits 5 to 67. Thereby, each of the devices 61 to 6
4 is easily positioned on body case 27. After that, the openings 38, 40, 58 are closed by the plug 39, the front cover 41, and the lower cover 37, and the lid members 39, 41, 37 are simply fixed by welding, so that each of the devices 61 to 64 is a body. It is housed and fixed inside the case 27 while being covered. For this reason, the number of components and the number of assembling steps related to fixing can be reduced as compared with the conventional device in which the devices 87 to 89 are fixed with belts or screws, and the throttle body 26 of each of the devices 61 to 64 can be reduced. Can be improved in the workability of attachment to the. Each of the devices 61 to 64 can be appropriately protected from muddy water, dust, and external impact. In this sense,
The weather resistance, durability, and impact resistance of the fuel supply device 12 can be improved, and the performance and quality of the fuel supply device 12 can be improved. Further, each of the devices 61 to 64
Is compact with respect to the throttle body 26, and
Also, it can be easily unitized in appearance. In addition, each of the concave portions 65 to which the respective devices 61 to 64 correspond.
67, these devices 61 to 64
Can be more reliably positioned and fixed. Further, since the present device 12 is made compact,
Space can be saved in the motorcycle, and the work of attaching the device 12 to the vehicle body can be facilitated. On the other hand, in order to remove the devices 61 to 64 from the body case 27, it is sufficient to simply remove the lid members 39, 41, 37 and open the openings 38, 40, 58. From this, each device 61 to the throttle body 26
The workability of removing the C.64 can be improved.

Here, in the conventional fuel injection device, the fuel storage chamber 87, the fuel pump 88, the fuel filter 89 and the like are individually fastened and fixed to one side of the throttle body 82 with a band, a screw or the like, and attached. In addition, the operability of removal and removal is poor, and moreover, Oita such as the devices 87 to 89 are exposed to the outside, resulting in poor waterproof, dustproof and impact resistance. On the other hand, according to the fuel supply device 12 of the present embodiment, it is possible to realize a unit having good workability of attaching and detaching each of the devices 61 to 64 and having good waterproof, dustproof, and impact resistance. it can. In this sense, the unitization of the fuel supply device 12 in the present embodiment simply means that each device 6
It is not limited to the unitization in the arrangement of 1 to 64, but also means a unitization capable of improving weather resistance, durability, impact resistance, aesthetics and handling workability in addition thereto. The advantage over unitization is clear.

According to the configuration of the fuel supply device 12 of this embodiment, the throttle body 26 and the case body 36 of the body case 27 are integrally formed of resin. It becomes easy, and both 26 and 36 can be reduced in weight. In addition, in this embodiment, since the intake manifold 28 made of resin is used, the weight of the unit including the intake manifold 28 can be reduced. In that sense, the cost of the fuel supply device 12 can be reduced, and
2 can improve the workability of attaching and detaching to and from the motorcycle, and can also contribute to reducing the weight of the motorcycle.

According to the configuration of the fuel supply device 12 of this embodiment, the fuel pump 6
1 and the pressure regulator 63 are unitized. This makes it possible to handle these devices 61 and 63 integrally with the throttle body 26, and does not require a structure for fixing them to another member such as the fuel tank 44. For this reason, the degree of freedom in vehicle design including the device 12 can be increased without impairing the appearance of the fuel tank 44. Further, the size of the fuel tank 44 can be reduced by an amount not including the two devices 61 and 63 in the fuel tank 44. Further, the fuel pump 61 is connected to the body case 27.
, The noise of the fuel pump 61 during the idling operation can be reduced.

According to the configuration of the fuel supply device 12 of this embodiment, the fuel pump 61 is fitted into the third concave portion 67 of the body case 27 so that the electrode terminal 71 of the pump 61 is connected to the power supply terminal 70. From being connected,
The trouble of wiring connection for the fuel pump 61 is omitted.
As well. The ECU 64 is connected to the second recess 6 of the body case 27.
Since the electrode terminal of the ECU 64 is connected to the corresponding electrode terminal 72 at the same time as being fitted into the
The labor of wiring connection for 4 is omitted. As a result, it is possible to reduce the number of parts and the number of assembling steps related to electric wiring and the like, and it is possible to further improve the workability of attaching and detaching the fuel pump 61 and the ECU 64 to and from the throttle body 26. Moreover, the ECU 64
Are provided in the body case 27 and are wired and connected as described above, and the fuel pump 61 and the injector 35 which are electrically related to the ECU 64 are
7, the electric wiring can be shortened.

According to the configuration of the fuel supply device 12 of this embodiment, the body case 27 is provided with the inlet pipe 37a and the fuel passage 37b associated with the fuel pump 61, and the outlet pipe 39a associated with the pressure regulator 63. . Moreover, the fuel pump 6
1. Fuel filter 62 and pressure regulator 63
Are directly connected to each other without using a pipe, so that the fuel pipe management for the fuel supply device is simplified. Therefore, the number of parts and the number of assembling steps related to the fuel pipe can be reduced, and the workability of attaching and detaching the devices 61 to 63 to and from the throttle body 26 can be further improved. In addition, the fuel pump 61
Since the subsequent high-pressure fuel pipe portion is located inside the body case 27 and is not exposed to the outside, the high-pressure fuel pipe portion can be appropriately protected from external impact.

According to the configuration of the fuel supply device 12 of this embodiment, the fuel is supplied to the injector 35 provided adjacent to the throttle body 26 through the fuel supply port 57 of the body case 27 and the pipe cap 73. Further, an injector 35 is mounted on the pipe cap 73 and integrated with the body case 27, and the injector 35 is provided in association with the intake passage 24 of the throttle body 26 via the intake manifold 28. Accordingly, the injector 35 and the fuel supply devices 61 to 64 other than the injector 35 are assembled around the throttle body 26 and the body case 27. For this reason, the throttle valve 25 and the devices 35, 61 to 64
Can be adjusted in consideration of the quality variation and the performance variation, and the performance and quality of the assembled fuel supply device 12 can be managed.

According to the configuration of the fuel supply device 12 of this embodiment, the injector 35 is mounted in the mounting hole 28a of the intake manifold 28 and is covered by the pipe cap 73 of the body case 27. No exposure to For this reason, also for the injector 35, waterproofness, dustproofness, and impact resistance can be improved similarly to the other fuel supply devices 61 to 64.

It should be noted that the present invention is not limited to the above-described embodiment, but can be carried out as follows without departing from the spirit of the invention.

(1) In the above embodiment, as shown in FIG. 1, at the position adjacent to the outlet 24a of the intake passage 24, the tip of the injector 35 is inserted into the mounting hole 28a of the intake manifold 28 connected to the intake passage 24. The injector 35 is included in the unitization of the fuel supply device 12 by mounting the unit and enclosing the head of the injector 35 in the piping cap 73 of the body case 27. On the other hand, as shown in FIG.
The injector 35 is not provided, and the tip of the injector 35 is mounted in a mounting hole 19 a provided near the intake port 19 of the cylinder head 14, and the head of the injector 35 is connected to the fuel supply port 57 of the body case 27. The injector 35 may be included in the unitization of the fuel supply device 76 by being included in the distal end of the extending fuel pipe 75.

(2) In the above embodiment, the ECU 64 used for fuel injection control is housed and fixed in the body case 27 as one of the fuel supply devices.
64 may be provided separately from the unitized fuel supply device.

(3) In the above embodiment, the injector 35 is provided integrally with the pipe cap 73 of the body case 27 as one of the fuel supply devices. May be provided separately.

(4) In the above embodiment, the piston valve is provided as the throttle valve 25, but a butterfly valve may be provided as a throttle valve.

[0048]

According to the first aspect of the present invention,
The fuel supply device, which is provided as a unit with the throttle body, can be securely fixed while properly protecting the fuel supply device from muddy water, dust, and external impact, and the workability of attaching and detaching the device to and from the throttle body is improved. It has the effect of being able to do it.

According to the structure of the invention described in claim 2, in addition to the effect of the invention described in claim 1, the cost of the fuel supply device can be reduced, and the work of attaching and detaching the fuel supply device to and from the vehicle can be achieved. This has the effect of improving vehicle performance and contributing to vehicle weight reduction.

According to the structure of the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, the size of the fuel tank can be reduced, and the vehicle including the fuel supply device can be provided. The degree of freedom in design can be increased, and the effect of reducing the noise of the fuel pump during idle operation of the engine can be exhibited.

According to the configuration of the invention described in claim 4, in addition to the effect of the invention described in claim 3, it is possible to reduce the number of parts and the number of assembling steps related to the electric wiring and the like, and the fuel pump throttle body Workability of attachment and detachment can be further improved, and the effect of shortening the electric wiring for the fuel pump can be achieved.

According to the structure of the invention described in claim 5, in addition to the effects of the invention described in claim 3 or 4, the number of parts related to the fuel pipe and the number of assembling steps can be reduced. The workability of attaching and detaching the fuel pump and the pressure regulator to and from the throttle body can be further improved, and the high pressure fuel pipe portion after the fuel pump can be appropriately protected from external impact.

According to the structure of the invention described in claim 6, in addition to the effects of the invention described in any one of claims 1 to 5, the throttle valve, the fuel supply device, and the fuel injection valve are The adjustment can be made in consideration of the quality variation and the performance variation, and an effect that the performance and the quality of the assembled fuel supply device can be managed can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an engine and a fuel supply device according to an embodiment.

FIG. 2 is a front view showing a throttle body of the fuel supply device.

FIG. 3 is also a top view of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is also a rear view of FIG. 2 showing a front surface of the body case.

FIG. 6 is a left side view of FIG.

FIG. 7 is a cross-sectional view along the line 7-7 in FIG. 6;

FIG. 8 is a partial cross-sectional view along the line 8-8 in FIG. 6;

FIG. 9 is an enlarged cross-sectional view taken along line 9-9 of FIG.

FIG. 10 is also a cross-sectional view showing a body case.

FIG. 11 is a sectional view showing a throttle body and a body case.

FIG. 12 is a schematic configuration diagram showing an engine and a fuel supply device according to another embodiment.

FIG. 13 is a schematic configuration diagram showing a conventional fuel injection device.

[Explanation of symbols]

 Reference Signs List 11 engine 12 fuel supply device 24 intake passage 25 throttle valve 26 throttle valve 27 body case 35 injector (fuel injection valve) 36 case main body 37 lower cover 37a inlet pipe (fuel inlet) 37b fuel passage 38 first opening 39 plug (lid) 39a Outlet pipe (fuel outlet) 40 second opening 41 front cover (lid member) 44 fuel tank 57 fuel supply port 58 third opening 61 fuel pump 62 fuel filter 63 pressure regulator 64 ECU 65 first Recess 66 Second recess 67 Third recess 70 Power supply terminal 71 Electrode terminal 76 Fuel supply device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satomi Wada 1-1, Kyowa-cho, Obu City, Aichi Prefecture Inside Ai San Industry Co., Ltd. (72) Inventor Yasunori Sakagami 1-1, Kyowa-cho, Obu City, Aichi Prefecture 1 Ai San Industry Co., Ltd.

Claims (6)

[Claims] 1. A fuel supply device for an engine, wherein a fuel supply device is provided as a unit with respect to a throttle body including an intake passage and a throttle valve provided in the intake passage, the fuel supply device being integrated with the throttle body. A body case for accommodating and fixing the fuel supply device therein, the body case having an opening for taking in and out the fuel supply device therein, and having the fuel supply device therein. An engine fuel supply device, comprising: a recess for fitting a device; and a lid member for closing the opening. 2. The fuel supply device for an engine according to claim 1, wherein the throttle body and the body of the body case are integrally formed of resin. 3. The engine fuel supply device according to claim 1, wherein the fuel supply device includes at least a fuel pump and a pressure regulator. 4. The body case includes therein a fitting recess corresponding to the fuel pump, and a power supply terminal provided adjacent to the recess, and the fuel pump is fitted into the recess. 4. The fuel supply device for an engine according to claim 3, wherein an electrode terminal provided on the fuel pump is connected to the power supply terminal. 5. The body case includes a fuel inlet for introducing fuel from a fuel tank, a fuel passage for flowing fuel introduced from the fuel inlet to the fuel pump, and a surplus generated by the pressure regulator. The fuel supply device for an engine according to claim 3, further comprising a fuel outlet that leads out fuel for returning the fuel to the fuel tank. 6. A fuel injection valve is provided adjacent to the throttle body, and a fuel supply port for supplying fuel to the fuel injection valve is provided in the body case. 6. The fuel supply device for an engine according to claim 5.