JPH10110625A - Fuel injection equipment in motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection equipment which can be stored and arranged in the conventional storage space of a motorcycle. SOLUTION: A furl distributing part D having a fuel distributing pipe N and a fuel injection valve J, is fixed and arranged on one side X of a multiple throttle body F having a plurality of intake passages 1A equipped with throttle valves 3 in its inside, and the longitudinal direction of the fuel distributing pipe N is arranged along the longitudinal direction S-S approximately perpendicular to the intake passages 1A of the multiple throttle body F. A fuel supply part G having a fuel reserving chamber I, and a fuel pump P and a fuel filter Q which are stored and arranged in the fuel reserving chamber I, is fixed and arranged on the other side Y of the multiple throttle body F, and the longitudinal direction ot the fuel pump P is arranged along the longitudinal direction S-S of the multiple throttle body F. Hereby, a fuel injection equipment B is unitized by the multiple throttle body F, the fuel distributing part D and the fuel supply part G, and the fuel reserving chamber I is connected to a fuel tank T through a first fuel inflow passage U1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for a motorcycle, and more particularly to a fuel supply system including a fuel pump, a fuel distribution pipe, a fuel injection valve, and a multiple throttle body provided with a plurality of intake passages. The present invention relates to a fuel injection device.

[0002]

2. Description of the Related Art As a fuel supply device for a motorcycle, a multiple carburetor using a plurality of single carburetors and a fuel injection device having a plurality of intake passages, a fuel pump, a fuel injection valve, and the like are mainly described. Separated.

FIG. 20, FIG. 21 and FIG.
2 will be described. FIG. 20 is a longitudinal sectional view of a single carburetor C constituting the multiple carburetor CA, and FIG. 21 is a view from the engine side of the multiple carburetor CA in which four single carburetors C are arranged laterally. FIG. 22 is a front plan view, and FIG. 22 is an upper plan view of FIG. FIG.
0 describes a single vaporizer C. 90 is
An intake passage 90A is penetrated through the inside, and the intake passage 90A is connected to a throttle valve shaft 90B.
This is a carburetor body that is opened and closed by C. Throttle valve 9
Intake path 90A upstream of 0C (right side in FIG. 20)
Negative pressure actuated valve guide cylinder 90D
Are connected and opened, and a negative pressure operating valve 91 is movably disposed in the negative pressure operating valve guide cylinder 90D. Negative pressure operated valve 9
An umbrella-shaped partitioning body 91A is attached to the upper end of 1 and an annular outer peripheral portion of the partitioning body 91A is in contact with an upper opening recessed portion 90E of the carburetor main body 90 that opens upward and the upper opening recessed portion 90E. It is sandwiched by a cover 92 having a bottomed cup shape. A pressure receiving chamber 91B is formed by the cover 92 and the upper surface of the partition 91A including the negative pressure operated valve 91 opposed thereto, and the upper opening concave portion 90E and the partition 91A including the negative pressure operated valve 91 opposed thereto are formed. An atmosphere chamber 91C is formed by the lower surface. That is, the intake path 90A
On one side X (upward in FIG. 20), a negative pressure operating portion C1 including a negative pressure operating valve guide cylinder 90D, an atmospheric chamber 91C, and a pressure receiving chamber 91B is formed upward.

On the other hand, on the other side Y (downward in FIG. 20) of the intake passage 90A, a float chamber main body 93 is disposed, and a lower part of the carburetor main body 90 and the float chamber main body 93 form a float chamber 94 directed downward. Is done. That is, on the other side Y (downward in FIG. 20) of the intake passage 90A, a fuel storage section C2 including the float chamber 94 is formed downward. Incidentally, 95
Is a low-speed fuel injection hole that opens to the intake passage 90A, and 96 is a main fuel injection hole that opens to the intake passage 90A facing the bottom of the negative pressure operating valve 91.

[0005] Then, four such single vaporizers C are arranged laterally at a fixed connecting pitch and fixed by the stay 97 to form a quadruple vaporizer CA. In the four-stage carburetor, the throttle valve shaft 90B of each single carburetor C is arranged concentrically on the side, and the ends of the throttle valve shafts 90B of the adjacent carburetors C are arranged facing each other. The opposite ends are synchronously connected by a connection tuning mechanism 98. The coupling tuning mechanism 98 is disclosed in Japanese Utility Model Publication No. 43-964. That is, the throttle valve 90C of each carburetor C constituting the four-stage carburetor is rotated synchronously by the connection tuning mechanism 98, and the throttle valve opening is tuned to the same opening and held.

As described above, the four-stage carburetor CA is formed in a space having a total height H, a total width W, and a total length L. This height H
Is mainly a negative pressure operating section C1, an intake path 90A, a fuel storage section C2.
Determined by the summed height of The total length L is
It is mainly determined by the length of the intake passage 90A in the longitudinal direction. Further, the total width W is determined by the continuous pitch of each adjacent carburetor C.

[0007] The four-stage vaporizer CA is shown in FIG.
3. The fuel tank T of the motorcycle as shown in FIG.
, A right side of the engine E, and a storage space A formed above the transmission M. The four-stage carburetor CA
Is connected to the intake pipe E1 connected to the engine E, and the upstream of the intake path 90A is connected to the inside of the air cleaner K.

Next, a fuel injection device for a motorcycle is disclosed in Japanese Patent Application Laid-Open No. 55-148958. According to this, the fuel pump and the pressure regulator are built in the fuel tank, and the inside of the fuel tank is used as a space for mounting them.

[0009]

According to the conventional motorcycle fuel supply device, the fuel supply device is provided in a storage space A formed below the fuel tank T, on the right side of the engine E, and above the transmission M. Must be located within. Here, in the multiple carburetor, as described above, its total height H is determined by the intake path 90A, the fuel storage section C2, and the negative pressure operating section C1, and its total width W is the carburetor body 9 including the intake path 90A.
0, the total length L is determined by the intake path 90
The length is determined by the length of A, and the main components thereof are the vaporizer main body 90, the float chamber main body 93, and the cover 92, so that they can be easily stored and arranged in the storage space A. On the other hand, when a fuel injection device is used as the fuel supply device, the configuration of the fuel injection device is configured by a multiple throttle body having a plurality of intake passages, a fuel pump, a fuel filter, a fuel distribution pipe, and a fuel injection valve. Therefore, it is extremely difficult to store the fuel injection device in the limited storage space A.

For example, according to the fuel injection device for a motorcycle described above, the following problems occur when the fuel pump and the pressure regulator are built in the fuel tank. In order to form a built-in space in the fuel tank and to insert a fuel pump and the like into the fuel tank, it is necessary to modify the fuel tank, and the conventional fuel tank cannot be used as it is. In a motorcycle, the fuel tank is disposed so as to be exposed to the outside. When providing a storage space for the fuel pump and the pressure regulator in the fuel tank, it is extremely difficult to provide the storage space without deteriorating the aesthetics of the fuel tank, and particularly the degree of freedom in designing the fuel tank is impaired. . The tank capacity of the fuel tank is determined by the cruising distance of the motorcycle when the fuel tank is full. According to the arrangement of the fuel pump and the pressure regulator in the fuel tank, the tank capacity of the fuel tank needs to be increased corresponding to the stored capacity, which is not preferable because the fuel tank becomes large. To store the fuel pump and pressure regulator in a sealed fuel tank,
It is necessary to provide a new opening in addition to the fuel supply hole, insert a fuel pump and a pressure regulator into the fuel tank through this opening, and then close the opening.
According to the above, the workability is extremely poor.
At the time of maintenance, the fuel pump and the pressure regulator in the fuel tank need to be taken out of the fuel tank, resulting in poor maintenance workability. In a motorcycle, the face of the driver is located relatively close to the fuel tank, and the fuel pump is arranged in the fuel tank, so that the fuel pump is arranged near the face. According to the above description, the pump noise generated from the fuel pump during idling operation in which the operation noise of the engine is relatively small is not preferable because the driver catches it as noise.

[0011] The fuel injection device for a motorcycle according to the present invention has been made in view of the above-described problems, and an object thereof is to largely change a motorcycle into a storage space in which a multiple carburetor is stored. A first object is to provide a fuel injection device that can be arranged without any problem. It is a second object of the present invention to provide a fuel injection device which is excellent in ease of attachment to a motorcycle and maintainability.

[0012]

According to the present invention, there is provided a fuel injection device for a motorcycle according to the present invention, which has a fuel supply device connected to an engine below a fuel tank mounted on the motorcycle in order to achieve the above object. In the motorcycle, the fuel injection device is formed by a multiple throttle body, a fuel supply unit, and a fuel distribution unit, and the multiple throttle bodies are provided with a plurality of intake passages separated laterally, and a plurality of intake passages in each intake passage. And a throttle valve that synchronously opens and closes each intake path,
The fuel supply unit is provided with a fuel storage chamber in which the fuel in the fuel tank is supplied by gravity and stores the fuel therein, and a fuel which is disposed in the fuel storage chamber, inhales the fuel in the fuel storage chamber, and discharges the fuel by increasing its pressure. The fuel distributing unit includes a pump and a fuel filter disposed in the fuel storage chamber and connected in series to the fuel pump to filter fuel supplied from the fuel pump. And a fuel injection valve for injecting the fuel in the fuel distribution passage toward each intake passage, wherein the longitudinal direction of the fuel distribution tube is substantially equal to the intake passage of the multiple throttle body. A fuel distributing section having a fuel distribution pipe and a fuel injection valve is fixedly arranged on one side of the multiple throttle body and is disposed along the orthogonal longitudinal direction. Bode A fuel supply unit provided with a fuel pump and a fuel filter in the fuel storage chamber is fixedly disposed on the other side of the multiple throttle body, and the fuel storage chamber is located at an upper position. A first feature is that the fuel filter is connected to the fuel tank via a first fuel inflow path, and the fuel discharge path of the fuel filter is connected to a fuel distribution path via a fuel outflow path.

Further, according to the present invention, in addition to the first feature, the multiple throttle body is formed by a single throttle body having a single intake passage formed therein and a base member extending laterally. On one side, a plurality of the throttle bodies are fixedly arranged, and on the other hand, a fuel storage chamber for housing a fuel pump and a fuel filter constituting a fuel supply unit is fixedly arranged on the other side of the base member. Second
The feature of.

Further, according to the present invention, in addition to the first feature, the multiple throttle body is formed by a single throttle body having a plurality of intake passages formed laterally, and the multiple throttle body is formed of a single throttle body. On one side, a fuel distribution section having a fuel distribution pipe and a fuel injection valve is fixedly arranged, and on the other hand, a fuel storage chamber for housing a fuel pump and a fuel filter constituting a fuel supply section is provided with a multiple throttle. A third feature is that the device is fixedly arranged on the other side of the body.

Further, the present invention is characterized in that, in addition to the first feature, a strainer is connected and arranged to a fuel suction passage of a fuel pump housed and arranged in the fuel storage chamber.

Further, in the present invention, in addition to the first feature, a fifth feature is that a fuel relief passage of a fuel pump housed and disposed in the fuel storage chamber is opened in the fuel storage chamber.

The present invention has a sixth feature in that, in addition to the first feature, the fuel storage chamber and the fuel tank are connected via a second flow path.

Further, in the present invention, in addition to the first feature, a seventh feature is that an effective passage area of the second passage is larger than an effective passage diameter of the first fuel inflow passage.

Further, in addition to the first feature, the present invention further comprises a pressure regulator disposed in a high pressure pipe connected from a fuel discharge passage of the fuel pump to a fuel distribution passage via a fuel filter, and a fuel return of the pressure regulator is provided. An eighth feature is that the passage is connected to the fuel storage chamber.

According to the present invention, in addition to the eighth feature, the pressure regulator is disposed in a high-pressure pipe between the fuel discharge passage of the fuel pump and the fuel suction passage of the fuel filter in the fuel storage chamber. A ninth feature is that the fuel return passage of the pressure regulator is opened into the fuel storage chamber.

According to the present invention, in addition to the eighth feature, the pressure regulator is disposed in a high-pressure pipe downstream of the fuel filter in the fuel storage chamber, and a fuel return passage of the pressure regulator is provided in the fuel storage chamber. The tenth feature is that the opening is provided in the room.

Further, in addition to the second and third features, the present invention further comprises a fuel pump and a fuel filter disposed in the fuel storage chamber, and a fuel pump and a fuel filter provided between the other side of the base member and the fuel storage chamber or the multiple throttle body. An eleventh feature is that the fuel tank is sandwiched between the other side and the fuel storage chamber.

Further, in the present invention, in addition to the first feature, a twelfth feature is that an on-off valve is disposed at the bottom of the fuel tank, and the upstream of the first fuel inflow passage is connected to the on-off valve.

Still further, according to the present invention, in addition to the twelfth feature, the on-off valve disposed at the bottom of the fuel tank includes a first fuel inflow passage opening at a low position in the fuel tank, and an opening valve at an intermediate position. A thirteenth feature is that the on-off valve with a reserve is capable of switching with the second fuel inflow path.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fuel injection device for a motorcycle according to the present invention will be described below with reference to FIGS.
Reference numeral 1 denotes a single throttle body constituting the multiple throttle body F, which is shown in FIG. (Hereinafter, a single throttle body 1 is simply referred to as a throttle body 1.) In the throttle body 1, an intake passage 1A is formed so as to penetrate from left to right in FIG.
A throttle valve 3 attached to the throttle valve shaft 2 to open and close the intake passage 1A is rotatably arranged. On one side X (upper side in the figure) of the intake passage 1A, a fuel injection valve support hole 1B for inserting and supporting a fuel injection valve described later is formed, and a portion below the fuel injection valve support hole 1B is downstream from the throttle valve 3. 1 (left side in FIG. 1), is formed to open obliquely toward the inside of the intake passage 1 </ b> A and further supports a fuel distribution pipe described later.
C is formed to protrude upstream (to the right in FIG. 1) from the fuel injection valve support hole 1B. The mounting surface 1D of the mounting arm 1C is preferably provided in a direction perpendicular to the longitudinal direction of the fuel injection valve support hole 1B. On the other side Y (the lower side in FIG. 1) of the intake passage 1A, a mounting surface 1E having a flat surface shape is formed for mounting to a base member described later. The mounting surface 1E is formed in parallel with the intake path 1A.

Reference numeral 4 denotes a base member having a flat plate shape and extending laterally. A mounting surface 1E of the throttle body 1 is disposed on one side 4A of the base member 4. In this embodiment, four throttle bodies 1 are arranged laterally in substantially the same state as the CA connecting pitch of the conventional multiple carburetor, and in this state, each throttle body 1 is disposed on one side 4A of the base member 4. The mounting surface 1E of the throttle body 1 is screwed with a screw. Therefore, the base member 4 is connected to the intake passage 1 of the multiple throttle body F.
A is arranged along the longitudinal direction S-S substantially orthogonal to A. In such a state, four intake passages 1A of the throttle body 1 are fixedly arranged laterally on one side 4A of the base member 4 at a predetermined continuous pitch to form a multiple throttle body F. At this time, each throttle valve shaft 2 of each throttle body 1
Are arranged concentrically, and the opposing ends of the throttle valve shafts 2 of the adjacent throttle bodies 1 oppose each other.
A is synchronously connected by the connection tuning mechanism 98 used in A, and the opening degree of each throttle valve 3 is adjusted and synchronized.

Next, a fuel supply section G composed of a fuel storage chamber I, a fuel pump P and a fuel filter Q is fixedly arranged on the other side 4B (the lower side in FIG. 2) of the base member 4. The fuel storage chamber I is configured as follows. The fuel storage chamber I has a mounting flange I1 on the upper side, has a bottomed cup shape opening upward, the mounting flange I1 is attached to the other side 4B of the base member 4 with screws 4C, and the upper opening is formed. Is closed by the other side 4 </ b> B of the base member 4, thereby forming a sealed fuel storage chamber I. The screw 4C
Is screwed together with the fuel storage chamber I, the base member 4, and the carburetor body 1. In the fuel storage chamber I, a fuel inflow path I2 opens on the left side, and a fuel outflow path I3 opens on the right side. The fuel pump P is a known electric fuel pump. The fuel pump P is located on the left side in the fuel storage chamber I in FIG. 2, and the longitudinal direction of the fuel pump P is substantially perpendicular to the intake passage 1A of the multiple throttle body F. It is arranged along the longitudinal direction SS (in other words, the longitudinal direction of the base member 4). In this example, the fuel pump P is sandwiched between the base member 4 and the fuel storage chamber I. The vertical direction of the fuel pump P is sandwiched between the other side 4B of the base member 4 and the bottom I5 of the fuel storage chamber I, Projection I whose side protrudes above bottom I5
6 for positioning and support. In such a state,
The fuel pump P is disposed in the upper projection plane of the base member 4, and its fuel suction passage P1 opens leftward into the fuel storage chamber I, and its fuel discharge passage P2 turns rightward into the fuel storage chamber I. I
Open inside. It should be noted that a terminal as a power supply unit for supplying a current from the outside to the motor unit of the fuel pump P is omitted. FIG. 4 shows the positional relationship between the base member 4 and the fuel supply section G when the multiple throttle body F shown in FIG.
Is well shown in the upper projection plane of the base member 4.

The fuel filter Q has a fuel intake passage Q
1 and a fuel discharge path Q2, which is a known one in which a filtering member is housed inside, and is disposed in the fuel storage chamber I. This fuel filter Q is a fuel pump P shown in FIG.
, The fuel suction passage Q1 opens into the fuel storage chamber I, and the fuel discharge passage Q2 is connected to the fuel outflow passage I of the fuel storage chamber I.
3 and connected to the flow path. Then, similarly to the fuel pump P, the fuel filter Q is also sandwiched and fixed in the fuel storage chamber I by the base member 4 and the fuel storage chamber I. The fuel filter Q is also disposed in the upper projection plane of the base member 4 similarly to the fuel pump P. (Shown in FIG. 4)

According to the above, the base member 4 is disposed in the longitudinal direction S- which is substantially perpendicular to the intake passage 1A of the multiple throttle body F.
S and one side 4A of the base member 4
Are fixedly arranged on the mounting surface 1E of each throttle body 1 constituting the multiple throttle body F. Also, the fuel storage chamber I
And a fuel supply section G constituted by a fuel pump P and a fuel filter Q is fixedly arranged on the other side 4B of the base member 4 and the longitudinal direction of the fuel pump P is the intake passage 1A of the multiple throttle body F. Are arranged along a longitudinal direction S-S substantially orthogonal to. Further, the fuel storage chamber I,
The fuel supply section G constituted by the fuel pump P and the fuel filter Q is disposed in an upper projection plane as viewed from above the base member 4.

The longitudinal direction of the fuel pump P is disposed along the longitudinal direction SS substantially perpendicular to the intake passage 1A of the multiple throttle body F, and the fuel storage chamber I, the fuel pump P and the fuel The fuel supply unit G constituted by the filter Q is fixedly arranged on the other side Y (downward in the figure) of the multiple throttle body F.

A fuel distribution section D constituted by a fuel distribution pipe N and a fuel injection valve J is fixedly arranged on one side X (upper in FIG. 2) of the multiple throttle body F. That is,
The fuel distribution pipe N has a fuel distribution passage N
1 and four fuel injection valve insertion holes N from the fuel distribution passage N1 toward the mounting end face N2 of the fuel distribution pipe N.
3 is opened and drilled.

The longitudinal direction of the fuel distribution pipe N is substantially perpendicular to the intake passage 1A of the multiple throttle body F.
S at this time, the mounting end face N2 of the fuel distribution pipe N is attached to the mounting arm 1 of each throttle body 1.
The fuel distribution pipe N is attached to the throttle body 1 by the screw N4 in this state. When the fuel distribution pipe N is attached to the throttle body 1, the fuel injection valve support hole 1B drilled in each throttle body 1 and each fuel injection valve insertion drilled in the fuel distribution pipe N opposed thereto are inserted. A fuel injection valve J is inserted into each of the holes N3, and the fuel injection valve J is sandwiched and fixed between the throttle body 1 and the fuel distribution pipe N. That is, a fuel injection valve J connected to the fuel distribution passage N1 is opened in the intake passage 1A downstream of the throttle valve 3 of each throttle body 1.

Thus, one side X of the multiple throttle body F
A fuel distribution section D composed of a fuel distribution pipe N and a fuel injection valve J is fixedly disposed (upper side in FIG. 2). At this time, the fuel distribution section D is substantially disposed in the upper projection plane of the multiple throttle body F. Is done. This is best illustrated in FIG.

According to the above description, the fuel distribution section D constituted by the fuel distribution pipe N and the fuel injection valve J is fixedly arranged on one side X (upper side) of the multiple throttle body F. A fuel supply unit G including a fuel storage chamber I, a fuel pump P, and a fuel filter Q is fixedly arranged on the other side Y (lower side). In other words, in the fuel injection device B, all of the configuration having the main function and the configuration having the large shape are unitarily integrated into the multiple throttle body F.

The overall height H, overall width W, and overall length L of the unitized fuel injection device B are determined by the multiple carburetor CA.
Can be grouped within substantially the same dimensions. That is, at the overall height H, the intake passage 1A of the multiple throttle body F can be arranged at a portion corresponding to the intake passage 90A of the carburetor main body 90, and the portion corresponding to the fuel storage portion C2 of the multiple carburetor CA is provided at the portion corresponding to the intake passage 90A. , A fuel storage chamber I as a fuel supply unit G, a fuel pump P, and a fuel filter Q can be arranged.
This is because the fuel distribution pipe N as the fuel distribution section D and the fuel injection valve J could be arranged in the portion corresponding to the negative pressure operation section C1 of A. Further, in the full width W, the connecting pitch of the intake passage 1A of each throttle body 1 can be matched with the connecting pitch of the multiple carburetor CA, and further, the longitudinal direction of the fuel distribution pipe and the longitudinal direction of the fuel pump P Since the direction is arranged along the longitudinal direction SS perpendicular to the intake path 1A of the multiple throttle body F, the multiple throttle body F can be arranged within the entire width of the multiple throttle body F. Further, for the total length L, the length of the intake passage 1A of the multiple throttle body F is determined by the multiple carburetor CA.
This is because the fuel injection valve J of the fuel distribution section D is arranged to be inclined with respect to the intake path 1A.

In the unitized fuel injection device B, the fuel pipe is connected as follows.
The fuel discharge passage P2 of the fuel pump P and the fuel suction passage Q1 of the fuel filter Q are connected by a first fuel passage V1 as a high-pressure pipe V, and the fuel storage chamber into which the fuel discharge passage Q2 of the fuel filter Q is inserted and connected. I fuel outflow channel I
3 and a fuel distribution passage N1 of the fuel distribution pipe N are connected by a fuel outflow passage V2 as a high-pressure piping V.

Referring back to the drawings, FIG. 1 is a longitudinal sectional view taken along line Z1-Z1 of FIG. 2 (a fuel pump is not shown), and FIG. 2 is a front view of a unitized fuel injection device. FIG. 3, FIG. 3 is an upper plan view of FIG. 2, FIG. 4 is a plan view showing an arrangement of the fuel supply unit G with respect to the base member 4, and FIG. 6 is a longitudinal sectional view of a main part along line Z3-Z3 in FIG. 2 (the fuel filter is not sectioned).

The unitized fuel injection device B is disposed in a storage space A formed below the fuel tank T, on the right side of the engine E, and above the transmission M shown in FIGS. Is done. At this time, the overall height H, the overall width W, and the overall length L of the fuel injection device B can be made substantially the same as the overall height H, the overall width W, and the overall length L of the multiple carburetor CA as described above. Can be easily stored and arranged. The downstream of each intake passage 1A of the multiple throttle body F is
The engine is connected to each intake pipe E1 of the engine E, and the upstream of the intake path 1A is connected to the inside of an air cleaner K. Further, the fuel inflow path I2 of the fuel storage chamber I is connected to the bottom of the fuel tank T via a first fuel inflow path U1 as a low-pressure pipe U. As described above, the unitized fuel injection device B is mounted on the motorcycle, and the connection of all the fuel flow paths including the low-pressure pipe and the high-pressure pipe is completed.

When the engine E is operated, the fuel in the fuel tank T flows into the fuel storage chamber I via the first fuel inflow path U1 and the fuel inflow path I2 due to its gravity, and the fuel is stored in the fuel tank T. The fuel is stored in the chamber I. On the other hand, when the fuel pump P is driven by the above, the fuel suction passage P1 of the fuel pump P sucks the fuel in the fuel storage chamber I and pressurizes the fuel. The fuel is supplied to the fuel filter Q via one fuel passage V1 and a fuel suction passage Q1. The fuel filtered by the fuel filter Q is distributed to the fuel distribution pipe N through the fuel discharge path Q2 of the fuel filter Q, the fuel outflow path I3 of the fuel storage chamber I, and the fuel outflow path V2 as the high-pressure pipe V. Is supplied into the passage N1, whereby the fuel injection valve J
, And the fuel that has been pressurized and filtered is supplied. On the other hand, an unillustrated ECU (Electronic C)
The injection signal is sent from the fuel injection valve J. The injection time of the fuel injection valve J is controlled by the injection signal, and the desired fuel is injected from each fuel injection valve J into the intake passage 1A of each throttle body 1. As a result, the operation of the engine E is performed. The above operation can be better understood with reference to FIG.

As described above, according to the fuel injection device of the present invention, the fuel distribution pipe N is connected to one side X of the multiple throttle body F.
And a fuel distributing section D composed of a fuel injection valve J and a fuel storage chamber I in which a fuel pump P and a fuel filter Q are housed and arranged on the other side Y of the multiple throttle body F. The supply unit G is fixedly arranged to unitize them, and the overall height H, overall width W, and overall length L of the unitized fuel injection device B are determined by a conventional multiple carburetor CA.
The fuel injection device B can be easily stored and arranged in the conventional storage space A formed by the fuel tank T, the engine E, and the transmission M of the motorcycle. The fuel injection of the motorcycle can be achieved without making any change to the configuration of the conventional motorcycle.

Further, a fuel storage chamber I is provided below the fuel tank T, and the fuel in the fuel tank T is supplied to the first fuel inflow passage U.
1. The fuel is once supplied into the fuel storage chamber I via the fuel inflow path I2, and the fuel in the fuel storage chamber I is pressurized and supplied to the fuel distribution pipe N via the fuel pump P and the fuel filter Q. According to this, it is possible to particularly effectively suppress a decrease in the fuel injection amount due to the biting of the air vapor contained in the fuel, thereby improving the operability of the engine. This is for the following reason.

First, when the motorcycle is running,
The fuel tank T vibrates, whereby the fuel in the fuel tank T undulates and fine air is mixed into the fuel. And the fuel tank T in which this air is mixed
The fuel inside is supplied to the fuel storage chamber I via the first fuel inflow path U1 and the fuel inflow path I2. On the other hand, the air-mixed fuel is effectively separated from the air and fuel in the fuel storage chamber I having a large space due to the difference in mass. This is because the pressure can be increased and supplied to the fuel distribution path N1 of the fuel distribution pipe N. The air accumulated in the fuel storage chamber I is supplied to the fuel tank T via the first fuel inflow path U1 by selecting the path diameter of the fuel inflow path I2 and the first fuel inflow path U1. Will be returned. Further, it is preferable that the opening position of the fuel inflow path I2 into the fuel storage chamber I be an upper position from the viewpoint of the separation of air and fuel and the discharge of air into the fuel tank T. Further, it is preferable that the opening position of the fuel suction passage P1 of the fuel pump P into the fuel storage chamber I be a lower position from the viewpoint that the separated air is not sucked.

Second, the first fuel inflow passage U1 is connected to the engine E
And its flow path length is formed relatively long. According to the above, the first fuel inflow passage U1 is connected to the engine E
The flow path is easily heated by the influence of the heat generated in the first fuel inflow path U1, whereby the fuel flowing down the first fuel inflow path U1 is heated to generate vapor. However, the fuel containing the vapor is supplied to the fuel storage chamber I through the fuel inflow passage I2.
Even when the fuel is supplied into the fuel tank, the vapor is separated from the fuel in the fuel storage chamber I in the same manner as described above, so that the fuel from which the vapor has been removed can be supplied to the fuel distribution pipe N.

It is preferable that foreign matter be removed from the fuel sucked into the fuel pump P by the strainer 9 upstream near the fuel pump P. In the present invention,
Since the strainer 9 can be housed and disposed in the fuel storage chamber I located near the fuel pump P, it is preferable in terms of layout. This strainer 9 is shown in FIG. 8, and the cylindrical strainer 9 is arranged in the fuel storage chamber I and inserted and arranged in the fuel suction passage P1 of the fuel pump P.

Further, since the fuel injection device B is integrally unitized by the multiple throttle body F, the fuel distribution portion D, and the fuel supply portion G, the workability of assembling the fuel injection device B itself is great. As a result, the performance and quality assurance of the fuel injection device B in the assembled state can be maintained and managed with extremely high accuracy.
Can be significantly improved, and the manufacturing cost can be effectively reduced.

Further, mounting on a motorcycle can be achieved by simply arranging and mounting the unitized fuel injection device B in the storage space A, and simply connecting the first fuel inflow passage U1 to the fuel tank T. The attachment to a motorcycle has been dramatically improved. In particular, in a motorcycle, the storage space A is extremely small as compared with a four-wheeled vehicle, and the above effect is extremely large in a two-wheeled vehicle.

If the unitized fuel injection device B is removed from the motorcycle during maintenance of the fuel injection device B, all the components constituting the fuel injection device B are removed from the motorcycle in one operation. And maintenance work can be performed very easily.

When the engine E has been used for a long period of time, it is necessary to tune the opening of each throttle valve 3 again by using the coupling tuning mechanism 98 due to the aging of the engine E or the like. In the fuel injection device B according to the present invention, in such a case, the fuel tank T is detached from the motorcycle to open the upper portion of the fuel injection device B, and thereafter the fuel tank T is positioned above the fuel injection device B. And the fuel tank T communicates with the fuel inflow path I2 of the fuel storage chamber I through a relatively long new first fuel inflow path. Then, while the engine E is operating, the coupling tuning mechanism 98 is operated from above to tune the opening of each throttle valve 3. In the above operation, the fuel in the fuel tank T is supplied with a low-pressure fuel due to its gravity in a new first fuel inflow path connecting the removed fuel tank T and the fuel inflow path I2 of the fuel storage chamber I. No special consideration is needed for fuel leakage. If the pressurized fuel flows down in the first fuel inflow passage, the pressure resistance of the first fuel inflow passage itself is increased, or the connection between the fuel tank T and the fuel inflow passage I2 of the fuel storage chamber I is made. Special attention must be paid to the seals of the parts.

The high-pressure fuel pressurized by the fuel pump P is supplied to the first fuel passage V1 connecting the fuel pump P and the fuel filter Q, and the fuel filter Q
It flows down in the high pressure pipe V of the fuel outflow passage V2 connecting the fuel supply passage N1 and the fuel distribution passage N1. Here, in the present invention, the fuel pump P and the fuel filter Q
, A fuel supply unit G, a multiple throttle body F,
A high-pressure pipe V of the first fuel passage V1 and the fuel outflow passage V2 is provided in a fuel injection device B in which a fuel distribution pipe D is disposed in close proximity.
Is arranged, the length of the passage can be shortened, and the use of an expensive and pressure-resistant passage member can be reduced.
Further, it is possible to prevent the high-pressure pipe through which the high-pressure fuel flows from being exposed to the outside as much as possible.

On the other hand, the first fuel inflow passage U1 connecting the fuel tank T and the fuel inflow passage I2 of the fuel storage chamber I has a longer length than the high-pressure pipe V.
Since the low-pressure fuel flowing down by gravity flows in the first fuel inflow path U1, a flow path member having a relatively low pressure resistance can be used.

Further, according to the fact that the fuel supply section G is formed by housing and arranging the fuel pump P and the fuel filter Q in the fuel storage chamber I, (1) the fuel storage chamber I, the fuel pump P, and the fuel filter It has become easy to arrange the fuel supply section G made of Q in a limited longitudinal direction substantially orthogonal to the intake path 1A of the multiple throttle body F. (2) Since the outer circumferences of the fuel pump P and the fuel filter Q are surrounded by the fuel storage chamber I, the fuel pump P and the fuel filter Q are not directly exposed outward, and the fuel pump P and the fuel filter Q are not exposed. The protection of the filter Q is effectively performed. Further, since the operation noise generated in the fuel pump P is cut off by the fuel storage chamber I, it has a sound insulating effect. (3) The first fuel passage V1 connecting the fuel discharge passage P2 of the fuel pump P and the fuel suction passage Q1 of the fuel filter Q uses a high-pressure pipe, but the fuel discharge passage of the first fuel passage V1 is used. No special consideration is required for the connection between P2 and the fuel intake passage Q1. This is because even if a small amount of fuel leaks at the connection portion, the leaking fuel is returned to the fuel storage chamber I and does not leak to the outside.

The fuel pump P and the fuel filter Q arranged in the fuel storage chamber I are fixed by being sandwiched between the other side 4B of the base member 4 and the bottom part I5 of the fuel storage chamber I. According to the above, fixing the fuel pump P and the fuel filter Q to the multiple throttle body F does not require special mounting members such as mounting bands and stays, and reduces the number of parts for mounting and the number of mounting work. This is effective in reducing the manufacturing cost of the fuel injection device.

The fuel pump P is provided with a fuel relief passage P4 having a relief valve. When the fuel pressure in the high-pressure pipe V including the fuel distribution path N1 rises above a certain pressure for some reason, the fuel relief passage P4 opens the fuel relief path P4 to open the fuel in the high-pressure pipe V. Is discharged into the fuel tank T to suppress abnormal fuel pressure rise. Here, in the present invention, the fuel storage chamber I is located downstream of the fuel relief passage P4.
It opens directly inside. According to this, the passage length of the fuel relief passage P4 can be greatly reduced, the degree of freedom of piping in the motorcycle can be greatly increased, and the appearance is not impaired. Further, since the fuel relief passage P4 is connected to the fuel storage chamber I close to the atmospheric pressure state, it is possible to perform the discharge of the fuel from the fuel relief passage P4 into the fuel storage chamber I without any hindrance. Can be.

Furthermore, according to the fact that a plurality of single throttle bodies 1 each having a single intake passage 1A are arranged and fixed laterally on one side 4A of the base member 4 extending laterally. In particular, when the connecting pitch of each intake path is changed, it is possible to extremely easily change the mounting position of each throttle body 1 with respect to the base member 4, thereby improving the versatility of a single throttle body 1. it can. Furthermore,
During operation of the fuel pump P, when heat is generated from the fuel pump P or when vibration is generated, the base member 4
By selecting the material described above, it is possible to prevent the heat and vibration from being transmitted to the throttle body 1 and it is effective.

Next, another embodiment of the fuel injection device for a motorcycle according to the present invention will be described with reference to FIGS. FIG. 9 is a front view of a unitized fuel injection device, and FIG. 10 is a longitudinal sectional view taken along line Z4-Z4 of FIG. Note that the embodiment differs from the embodiment shown in FIG. 2 in that the throttle body is different and the base member 4 is not provided.
Only different portions will be described, and the same reference numerals are used for the same structural portions. Reference numeral 5 denotes a multiple throttle body formed by a single throttle body, and a plurality of intake passages 5A are integrally formed laterally at a desired continuous pitch. On the other side Y (the lower side in FIG. 9) of the intake passage 5A, a mounting flange portion 5B is integrally formed along a longitudinal direction SS substantially orthogonal to the intake passage 5A of the multiple throttle body 5. A fuel distribution section D composed of a fuel distribution pipe N and a fuel injection valve J is fixedly arranged on one side X of the multiple throttle body 5 in the same manner as in the above embodiment, and the other side of the multiple throttle body 5 is provided. Mounting surface 5C of mounting flange 5B at Y
Further, similarly to the above-described embodiment, a fuel supply section G composed of a fuel pump P and a fuel filter Q housed and arranged in a fuel storage chamber I is fixedly arranged.

According to the above description, the fuel distribution unit D is fixedly arranged on one side X of the multiple throttle body 5, and the fuel supply unit G is fixedly arranged on the other side Y, whereby the unitized fuel injection device B is formed. It is formed. According to such an embodiment,
The multiple throttle body 5 does not require a base member because it is formed by a single throttle body having a plurality of intake paths 5A, and a plurality of throttle bodies each having an intake path for the base member. There is no need to install a throttle body. Further, since the throttle valve shaft 2 is rotatably supported, the processing accuracy of the valve shaft hole 5D formed in the throttle body can be improved and the number of processing steps can be reduced. This is because all the valve shaft holes 5D can be machined at a time with a single drill while the throttle body is set.

Thus, the number of parts, the number of processing steps, and the number of assembling steps can be reduced, and the manufacturing cost of the fuel injection device can be further reduced. According to the improvement of the machining accuracy of the valve shaft hole 5B, although not shown in FIG. 9, the throttle valve shaft 2 is a single shaft, and the coupling tuning mechanism 9 is used.
8 can be abolished, and the manufacturing cost can be further reduced.

In the present embodiment, the fuel pump P and the fuel filter Q are sandwiched between the mounting surface 5C on the other side Y of the multiple throttle body 5 and the bottom I5 of the fuel storage chamber I. The effect can be achieved.

Next, an embodiment in which a second flow path I4 is provided in the fuel storage chamber I so as to be separated from the fuel inflow path I2 is shown in FIG. Only parts different from FIG. 2 will be described. Second channel I4
Has one end open in the fuel storage chamber I and the other end connected to the fuel tank T and open. According to the provision of the second flow path I4, the air in the fuel storage chamber I can be positively and instantaneously discharged into the fuel tank T. From the fuel tank T, the first fuel inflow path U1, the fuel inflow Fuel can smoothly flow into the fuel storage chamber I via the path I2. Further, in the fuel storage chamber I, air and vapor contained in the fuel can be reliably separated, and the separated air and vapor can be immediately discharged into the fuel tank T. Air-free and vapor-free fuel can be supplied.

When the effective passage area of the second flow path I4 is made larger than the effective passage area of the first fuel inflow path U1, the fuel inflow into the fuel storage chamber I and the fuel storage chamber Air in I, vapor separation, air,
The dischargeability of the vapor into the fuel tank T can be further improved. Furthermore, the opening position of the second flow path I4 into the fuel storage chamber I may be opened above the opening position of the fuel inflow path I2 in the direction of gravity.

The second flow path I4 can be employed in the embodiment shown in FIG. 9 and has the same functions and effects as described above.

Next, another embodiment will be described with reference to FIGS. FIG. 12 is a top plan view of a unitized fuel injection device including a pressure regulator, and FIG. 13 is a longitudinal sectional view of a main part taken along line Z5-Z5 in FIG. This embodiment is different from the first embodiment shown in FIG. 3 in that a pressure regulator is arranged. Only different portions will be described, and the same reference numerals will be used for the same structural portions.

The pressure regulator R is known, and functions to keep the fuel pressure flowing through the high-pressure pipe V including the fuel distribution passage N1 of the fuel distribution pipe N at a constant pressure with respect to the atmospheric pressure or the negative pressure of the intake pipe. It is a fuel pressure regulating valve. The pressure regulator R has a casing divided into a spring chamber 6B and a fuel chamber 6C by a diaphragm 6A.
A fuel introduction passage 6D for introducing high-pressure fuel pressurized by the fuel pump P into the fuel chamber 6C and a fuel chamber 6
Fuel return passage 6E for discharging fuel in C to the outside
The valve 6F formed integrally with the diaphragm 6A is urged to close the fuel return passage 6E by a spring 6G contracted in a spring chamber 6B.

The fuel introduction passage 6D of the pressure regulator R is connected to a high-pressure pipe V extending from the fuel discharge passage P2 of the fuel pump P to the fuel distribution passage N1 through the fuel filter Q. What is done is that the downstream of the fuel return passage 6E is connected into the fuel storage chamber I.

According to the above, when the engine E is operating,
The pressurized fuel flowing through the high-pressure pipe V is supplied to the fuel introduction path 6.
D flows into the fuel chamber 6C, fills the fuel chamber 6C, depresses the valve 6F via the diaphragm 6A, balances with the spring 6G at the set pressure, and keeps the fuel pressure in the high-pressure pipe V at a fixed set pressure. . On the other hand, when the valve 6F opens the fuel return passage 6E as described above, the fuel in the fuel chamber 6C flows into the fuel return passage 6E, and this fuel is returned to the fuel storage chamber I. By returning the return fuel flowing through the fuel return passage 6E into the fuel storage chamber I, the diameter of the first fuel inflow passage U1 can be reduced.

According to the above, the diameter of the first fuel inflow passage U1 having a relatively long flow path length can be reduced, which is particularly preferable in view of the appearance of the motorcycle. Further, as compared with connecting the fuel return passage 6E to the fuel tank T, the length of the fuel return passage 6E can be shortened, which is convenient for unitizing the fuel injection device B.

Since the pressure regulator R can be arranged in a space such as outside the fuel distribution pipe N on one side X of the throttle body 1, when the fuel injection device B including the pressure regulator R is unitized, The overall height H, the overall width W, and the overall length L can be substantially the same as those of the first embodiment, thereby achieving the same effect as the unitization of the fuel injection device B as in the first embodiment. it can. This can be understood from FIGS.

Next, another embodiment will be described with reference to FIGS. The arrangement of the pressure regulator R with respect to the high-pressure pipe V is different from the embodiment shown in FIG. Only the differences will be described. The fuel chamber 6C of the pressure regulator R has a fuel discharge passage P2 of the fuel pump P and a fuel suction passage Q1 of the fuel filter Q.
And a fuel return passage 6E is connected to the fuel storage chamber I. I7 extends from the fuel return passage 6E to the fuel storage chamber I.
This is a communication groove for actively returning the returned fuel into the fuel storage chamber I where the fuel suction passage P1 of the fuel pump P is opened. According to the above, control of the fuel pressure in the high-pressure pipe V, reduction in the diameter of the first fuel inflow path U1, and reduction in the length of the fuel return path 6E can be achieved as in the above-described embodiment. In particular, according to this embodiment, since the fuel pressure supplied to the fuel filter Q is controlled to a constant pressure, an excessive pressure does not act on the filter member disposed in the fuel filter Q, so that the filter member Durability can be increased. Further, the amount of fuel flowing into the fuel filter Q can be reduced corresponding to the amount of fuel returning from the fuel return passage 6E, so that the filtering performance of the filtering member can be maintained satisfactorily for a long period of time. Further, since the connection between the pressure regulator R and the first fuel passage V1 as the high-pressure pipe V is located in the fuel storage chamber I, no special consideration is required for fuel leakage at this connection. Further, since the pressure regulator R, the first fuel passage V1, and the fuel return passage 6E are arranged in the fuel storage chamber I, they are protected by the fuel storage chamber and are not exposed to the outside, so that the appearance is preferable. Further, since the pressure regulator R is located on the other side Y of the multiple throttle body F and is housed in the fuel storage chamber I, when the fuel injection device B including the pressure regulator R is unitized, its total height is reduced. H, overall width W, and overall length L can be set to substantially the same dimensions as those of the above-described embodiment, whereby the same effect as that of the above-described unitization of the fuel injection device B can be obtained. This is best illustrated in FIG.

Next, another embodiment will be described with reference to FIGS. 14 differs from the embodiment shown in FIG. 14 in the arrangement of the pressure regulator R with respect to the high-pressure pipe V. Only the differences will be described. The pressure regulator R is disposed in the fuel storage chamber I and to the right of the fuel filter Q. The fuel chamber 6C of the pressure regulator R is connected to a fuel outflow passage V2 as a high-pressure pipe V connecting the fuel discharge path Q2 of the fuel filter Q and the fuel distribution pipe N. Specifically, the left flow path 6G opening to the fuel chamber 6C
Is connected to the fuel outflow passage Q2 of the fuel filter Q through the fuel outflow passage V2, and the fuel storage chamber I is connected to the fuel outflow passage V2 in which the right passage 6H opening to the fuel chamber 6C is connected to the fuel distribution pipe N. And is connected to the fuel outflow path I3.

As described above, it is possible to control the fuel pressure in the high-pressure pipe V, to reduce the diameter of the first fuel inflow passage U1, and to shorten the length of the fuel return passage 6E, as in the above embodiment. In particular, according to this embodiment, the fuel supplied to the pressure regulator R is supplied with clean fuel from which foreign matter in the fuel is removed by the fuel filter Q on the upstream side, so that the fuel return passage of the valve 6F is provided. 6E can be stably maintained over a long period of time. In addition, since the connection between the pressure regulator R and the fuel outflow passage V2 as the high-pressure pipe V is located in the fuel storage chamber I, no special consideration is required for fuel leakage at this connection. Further, the pressure regulator R and the fuel return passage 6E are connected to the fuel storage chamber I.
Since they are disposed inside, they are protected by the fuel storage chamber and are not exposed to the outside, which is preferable in appearance. Further, since the pressure regulator R is located on the other side Y of the multiple throttle body F and is housed in the fuel storage chamber I, when the fuel injection device B including the pressure regulator R is unitized, its total height is reduced. H, overall width W, and overall length L can have substantially the same dimensions as those of the above-described embodiment, and the same effect as that of the above-described unitization of the fuel injection device B can be obtained. This is best illustrated in FIG.

Next, another embodiment will be described with reference to FIG. This embodiment is similar to the fuel tank T according to the first embodiment.
An opening / closing valve 7 is disposed at the bottom of the first fuel inflow passage U1 connected to the fuel inflow passage I2 of the fuel storage chamber I.
Connected to. According to the present embodiment, when the unitized fuel injection device B is detached from the motorcycle for maintenance, the connection of the fuel passage between the fuel tank T and the fuel injection device B is cut off by closing the on-off valve 7. The maintenance work can be performed satisfactorily without leakage of the fuel to the outside. When the motorcycle is stored for a long period of time, when the engine is operated with the on-off valve 7 closed to stop the operation and the engine is stopped with the fuel in the fuel distribution passage N1 reduced, the fuel injection device Since the remaining fuel in B can be reduced, fuel deterioration due to the temporal change of the fuel remaining in the fuel injection device B can be minimized. According to this, the sticking of the fuel injection valve J at the valve portion can be improved, and the startability of the engine when restarting the engine after long-term storage can be improved. This is because when the engine is restarted, when the on-off valve 7 is opened, new fuel is supplied to the fuel injection valve J via the fuel pump P.

Next, another embodiment will be described with reference to FIG. In this embodiment, the on-off valve 7 in the embodiment of FIG. 18 is replaced with an on-off valve 8 with a reserve. The reserve on-off valve 8 is disposed at the bottom of the fuel tank T, and is provided with a first fuel inflow passage 8 opening at a low position of the fuel tank T.
A, the second fuel inflow passage 8B opening to the middle position, and the closed state are selectively selected, and the upstream side of the first fuel inflow passage U1 is connected to the on-off valve with reserve.

When such an on-off valve 8 with a reserve is used,
During normal operation of the engine, fuel is supplied into the fuel storage chamber I via the second fuel inflow passage 8B. When the fuel in the fuel tank T is consumed and the second fuel inflow path 8B opens on the fuel level of the fuel tank T, the supply of the fuel to the fuel pump P via the second fuel inflow path 8B is started. When stopped, the engine stops automatically. According to this, the driver senses that the fuel amount in the fuel tank T has become equal to or less than a certain amount, turns the valve to connect the first fuel inflow passage 8A and the first fuel inflow passage U1, The engine can be operated again with the remaining fuel, and after that the fuel can be refilled into the fuel tank T. According to this embodiment, in addition to the effects of the above-described embodiment, it is possible to provide a function of notifying of running out of fuel in the fuel tank T.

[0074]

As described above, according to the fuel injection system for a motorcycle according to the present invention, a plurality of multiple throttle bodies are arranged in a plurality of sideways separated intake passages, and each intake passage is arranged in each intake passage. A throttle valve that synchronously opens and closes a passage; a fuel supply unit includes a fuel storage chamber in which fuel in the fuel tank is supplied by gravity and fuel is stored therein; and a fuel storage chamber disposed in the fuel storage chamber. Inhale the fuel in the room,
A fuel pump that is pressurized and discharged, and a fuel filter that is disposed in the fuel storage chamber and that is connected in series to the fuel pump and that filters fuel supplied from the fuel pump. A fuel distribution pipe provided with a fuel distribution path; and a fuel injection valve for injecting fuel in the fuel distribution path toward each intake path. The fuel distributing section, which is disposed along the longitudinal direction SS substantially perpendicular to the intake path of the body and includes a fuel distribution pipe and a fuel injection valve, is fixedly disposed on one side of the multiple throttle body. The fuel pump is disposed along the longitudinal direction SS of the multiple throttle body along a longitudinal direction of the fuel pump, and a fuel supply unit having a fuel pump and a fuel filter is provided in the fuel storage chamber on the other side of the multiple throttle body. Fixed arrangement, while the fuel reservoir,
Since the fuel tank at the upper position is connected via the first fuel inflow path and the fuel discharge path of the fuel filter is connected via the fuel outflow path to the fuel distribution path, the overall height H, the overall width W of the fuel injection device, The total length L can be unitized and grouped within the same dimensions as the conventional multiple vaporizer, and can be arranged in the conventional storage space of the motorcycle without making any changes to the configuration of the conventional motorcycle. This has achieved the fuel injection of motorcycles.

The fuel pump sucks and discharges the fuel in the fuel storage chamber located below the fuel tank. According to the fuel pump, the amount of air contained in the fuel and the amount of fuel injected by the vapor trapped in the fuel tank are determined. Can be suppressed, accurate fuel control can be performed, and the operability of the engine can be improved.

Further, since the fuel injection device is integrally unitized by the multiple throttle body, the fuel distribution portion and the fuel supply portion, the assemblability of the fuel injection device and the performance and quality assurance can be improved. Improvement of productivity and reduction of manufacturing cost can be achieved.

Further, when the fuel injection device is mounted on the motorcycle, the fuel injection device may be disposed in the storage space and connected to the fuel tank via the first fuel inflow passage, so that the mounting property can be improved. .

Further, at the time of maintenance of the fuel injection device, if the fuel injection device is removed, all the components constituting the fuel injection device can be removed at a time, so that the maintenance work can be easily performed. Further, the tuning operation of the opening degree of the throttle valve can be performed very easily.

Further, a first high pressure pipe as a fuel injection device is provided.
Since the fuel passage and the fuel outflow passage are arranged, the high-pressure pipe can be shortened, and the exposure of the high-pressure pipe to the outside can be reduced.

The first fuel inflow passage connecting the fuel tank and the fuel storage chamber has a relatively long passage diameter, but the first fuel inflow passage can use a passage member having low pressure resistance.

Further, according to the arrangement of the fuel pump and the fuel filter in the fuel storage chamber, their protection is effectively performed by the fuel storage chamber and the operation sound of the fuel pump is cut off by the fuel storage chamber. or,
No special consideration is required for the connection of the first fuel passage connecting the fuel discharge passage of the fuel pump and the fuel suction passage of the fuel filter.

The multiple throttle body is formed by a single throttle body having a single intake passage, and a plurality of the throttle bodies are fixedly arranged on one side of a base member extending laterally. According to what was done,
It is possible to easily change the connection pitch of each intake path, and it is possible to increase the versatility of a single throttle body. Further, by selecting the material of the base member, transmission of heat and vibration generated in the fuel pump to the throttle body can be suppressed.

The multiple throttle body is formed by a single throttle body in which a plurality of intake passages are formed laterally, and is provided on one side of the multiple throttle body.
A fuel distribution unit having a fuel distribution pipe and a fuel injection valve is fixedly arranged, while a fuel storage chamber for storing therein a fuel pump and a fuel filter constituting a fuel supply unit is provided on the other side of the multiple throttle body. According to the fixed arrangement,
The number of parts, processing steps, and assembly steps can be reduced, and the manufacturing cost of the fuel injection device can be reduced.

According to the arrangement of the strainer connected to the fuel suction passage of the fuel pump housed and arranged in the fuel storage chamber, no special chamber for accommodating the strainer is prepared, and the upstream side near the fuel pump is provided. The strainer can be easily arranged.

According to the fact that the fuel relief passage of the fuel pump housed and disposed in the fuel storage chamber is opened into the fuel storage chamber, the fuel relief passage is directly opened into the fuel storage chamber. Therefore, the degree of freedom of piping in the motorcycle can be greatly increased, and the appearance is not impaired. Further, since the fuel relief passage is connected to the fuel storage chamber close to the atmospheric pressure state, it does not hinder the discharge of fuel from the fuel relief passage into the fuel storage chamber at all.
It can be performed well.

In addition, since the fuel storage chamber and the fuel tank are connected via the second flow path, the inflow of the fuel from the first fuel inflow path into the fuel storage chamber can be improved, and the fuel storage chamber is connected to the fuel storage chamber. The ability to discharge air and vapor into the tank can be improved.

Further, when the effective passage area of the second flow passage is made larger than the effective passage diameter of the first fuel inflow passage, the inflow of fuel and the discharge of air and vapor can be further improved.

Further, a high pressure pipe connected from the fuel discharge passage of the fuel pump to the fuel distribution passage via the fuel filter is provided.
According to the arrangement of the pressure regulator and the connection of the fuel return passage of the pressure regulator to the fuel storage chamber, the diameter of the first fuel inflow passage can be reduced, which is preferable in terms of the appearance of the motorcycle. This can be shortened, which is preferable for unitizing the fuel injection device.

Further, the pressure regulator is disposed in the fuel storage chamber, and is disposed in a high pressure pipe between the fuel discharge passage of the fuel pump and the fuel suction passage of the fuel filter. According to the opening, the durability of the filtration member can be improved. The filtration performance of the filtration member can be guaranteed for a long period of time. The pressure regulator is ensured by the fuel storage chamber and has an advantageous effect on appearance.

Further, the pressure regulator is disposed in the high-pressure pipe downstream of the fuel filter in the fuel storage chamber, and the fuel return passage of the pressure regulator is opened in the fuel storage chamber. Occlusion can be stably controlled over a long period of time. There is an effect that the pressure regulator is protected by the fuel storage chamber and is preferable in appearance.

Further, according to the fact that the fuel pump and the fuel filter arranged in the fuel storage chamber are sandwiched between the fuel storage chamber and the other side of the base member or the fuel storage chamber and the other side of the multiple throttle body, In addition, the fuel filter can be easily attached to the multiple throttle body, and the manufacturing cost can be reduced.

Also, an on-off valve is arranged at the bottom of the fuel tank,
According to the connection of the upstream of the first fuel inflow passage to the on-off valve, when removing the fuel injection device during maintenance,
Fuel leakage to the outside can be suppressed, and maintenance workability can be favorably performed.

Further, an on-off valve arranged at the bottom of the fuel tank has a reserve for switching between a first fuel inflow passage opening at a low position in the fuel tank and a second fuel inflow passage opening at a middle position. According to the attached on-off valve, a function is provided especially for a notice of running out of fuel in the fuel tank.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a fuel injection device in a motorcycle according to the present invention, taken along a line Z1-Z1 in FIG.

FIG. 2 is a front view of a unitized fuel injection device.

FIG. 3 is an upper plan view of FIG. 2;

FIG. 4 is a plan view showing an arrangement of a fuel supply unit G with respect to a base member 4.

FIG. 5 is a side view including a partial cross section taken along line Z2-Z2 in FIG. 2;

FIG. 6 is a vertical sectional view of an essential part taken along line Z3-Z3 in FIG. 2;

FIG. 7 is a block diagram of a fuel injection device in the motorcycle according to the present invention.

FIG. 8 is a front view including a longitudinal section of a main part showing another embodiment of the fuel injection device for the motorcycle according to the present invention.

FIG. 9 is a front view including a vertical cross section of a main part showing another embodiment of the fuel injection device in the motorcycle according to the present invention.

FIG. 10 is a longitudinal sectional view taken along line Z4-Z4 in FIG. 9;

FIG. 11 is a front view including a vertical cross section of a main part showing another embodiment of the fuel injection device in the motorcycle according to the present invention.

FIG. 12 is a top plan view showing another embodiment of the fuel injection device in the motorcycle according to the present invention.

FIG. 13 is a longitudinal sectional view taken along line Z5-Z5 in FIG. 12;

FIG. 14 is a front view including a vertical cross section of a main part showing another embodiment of the fuel injection device for the motorcycle according to the present invention.

FIG. 15 is a plan view showing an arrangement of a fuel supply unit with respect to a base member in FIG. 14;

FIG. 16 is a front view including a longitudinal section of a main part of another embodiment of the fuel injection device for the motorcycle according to the present invention.

FIG. 17 is a plan view showing the arrangement of the fuel supply unit with respect to the base member in FIG. 16;

FIG. 18 is a front view including a main part longitudinal sectional view showing another embodiment of the fuel injection device in the motorcycle according to the present invention.

FIG. 19 is a front view including a vertical sectional view of a main part of another embodiment of the fuel injection device for the motorcycle according to the present invention.

FIG. 20 is a longitudinal sectional view of a conventional multiple vaporizer.

FIG. 21 is a front view of a conventional multiple vaporizer.

FIG. 22 is an upper plan view of FIG. 21;

FIG. 23 is a simplified side view of a motorcycle.

FIG. 24 is a simplified top plan view of FIG. 23.

[Explanation of symbols]

A Storage space in a motorcycle B Fuel injection device D Fuel distribution unit F Multiple throttle body G Fuel supply unit J Fuel injection valve N Fuel distribution pipe N1 Fuel distribution path P Fuel pump P1 Fuel intake path P2 Fuel discharge path Q Fuel filter Q1 Fuel intake path Q2 Fuel discharge path R Pressure regulator SS Longitudinal direction substantially orthogonal to the intake path of multiple throttle body F U1 First fuel inflow path V High pressure pipe V1 First fuel path V2 Fuel outflow path I Fuel storage chamber I2 Fuel inflow path 1, 5 Throttle body 1A, 5A Intake path 4 Base member 6E Fuel return path 7 On-off valve 8 On-off valve with reserve 9 Strainer X One side of multiple throttle body F Y The other side of multiple throttle body F

Claims (13)

[Claims] 1. In a motorcycle provided with a fuel supply device connected to an engine below a fuel tank mounted on the motorcycle, a fuel injection device B includes a multiple throttle body F.
And a fuel supply section G and a fuel distribution section D,
The multiple throttle body F is provided with a plurality of intake passages 1A that are provided laterally separated from each other, and a throttle valve 3 that is disposed in each intake passage 1A and that synchronously opens and closes each intake passage 1A. G is a fuel storage chamber I in which fuel in the fuel tank T is supplied by gravity and fuel is stored therein; and G is disposed in the fuel storage chamber I, and sucks the fuel in the fuel storage chamber I;
A fuel pump P that discharges pressure and is disposed in the fuel storage chamber I and connected in series with the fuel pump P in a flow path;
A fuel filter Q for filtering fuel supplied from the fuel pump P is provided. The fuel distribution section D includes a fuel distribution pipe N in which a fuel distribution path N1 is formed, and a fuel distribution path N1.
And a fuel injection valve J for injecting fuel into the intake passages 1A. A longitudinal direction S of the fuel distribution pipe N is substantially perpendicular to the intake passage 1A of the multiple throttle body F. -S, and a fuel distribution section D having a fuel distribution pipe N and a fuel injection valve J is fixedly disposed on one side X of the multiple throttle body F. Are arranged along the longitudinal direction SS of the multiple throttle body F, and a fuel supply section G having a fuel pump P and a fuel filter Q in the fuel storage chamber I is connected to the other side Y of the multiple throttle body F. On the other hand, the fuel storage chamber I is connected to a fuel tank T located at an upper position via a first fuel inflow path U1, and the fuel discharge path Q2 of the fuel filter Q is connected to a fuel discharge path V2 via a fuel outflow path V2. Connected to fuel distribution passage N1 Fuel injection device in the motorcycle according to claim. 2. The multiple throttle body F is formed by a single throttle body 1 having a single intake passage 1A formed therein, and a plurality of throttle members F are provided on one side 4A of a base member 4 extending laterally. The throttle body 1 is fixedly arranged, while a fuel pump P constituting a fuel supply portion G;
The fuel injection device for a motorcycle according to claim 1, wherein a fuel storage chamber (I) accommodating the fuel filter (Q) and the fuel filter (Q) is fixedly disposed on the other side (4B) of the base member (4). 3. The multiple throttle body F is formed by a single throttle body 5 having a plurality of intake passages 5A formed laterally, and a fuel X is provided on one side X of the multiple throttle body F. A fuel distribution section D having a distribution pipe N and a fuel injection valve J is fixedly arranged. On the other hand, a fuel storage chamber I in which a fuel pump P and a fuel filter Q constituting a fuel supply section G are accommodated is provided. 2. The fuel injection device for a motorcycle according to claim 1, wherein the fuel injection device is fixed to the other side Y of the continuous throttle body F. 4. The fuel injection device for a motorcycle according to claim 1, wherein a strainer 9 is connected to a fuel suction passage P1 of the fuel pump P housed and arranged in the fuel storage chamber I. 5. The fuel injection device for a motorcycle according to claim 1, wherein a fuel relief passage P4 of a fuel pump P housed and disposed in the fuel storage chamber I is opened in the fuel storage chamber I. . 6. The fuel injection device for a motorcycle according to claim 1, wherein the fuel storage chamber I and the fuel tank T are connected via a second flow path I4. 7. The fuel injection device for a motorcycle according to claim 1, wherein the effective passage area of the second flow passage I4 is larger than the effective passage diameter of the first fuel inflow passage U1. 8. A pressure regulator R is disposed in a high-pressure pipe V connected from a fuel discharge path P2 of the fuel pump P to a fuel distribution path N1 via a fuel filter Q, and a fuel return path 6 of the pressure regulator is provided.
The fuel injection device for a motorcycle according to claim 1, wherein E is connected to a fuel storage chamber I. 9. The pressure regulator R,
The fuel discharge passage P of the fuel pump P in the fuel storage chamber I
9. The fuel for a motorcycle according to claim 8, wherein the fuel return passage 6E of the pressure regulator R is opened in the fuel storage chamber I while being disposed in the high-pressure pipe V between the fuel supply passage 2 and the fuel suction passage Q1 of the fuel filter Q. Feeding device. 10. The pressure regulator R
In the fuel storage chamber I, and the fuel filter Q
The fuel supply device for a motorcycle according to claim 8, wherein the fuel return passage (6E) of the pressure regulator (R) is opened in the fuel storage chamber (I) while being disposed in the high pressure pipe (V2) on the downstream side of the vehicle. 11. A fuel pump (P) and a fuel filter (Q) disposed in a fuel storage chamber (I) are connected to a base member (4).
4. The fuel supply device for a motorcycle according to claim 2, wherein the fuel supply chamber is sandwiched between the other side 4B and the fuel storage chamber I or the other side Y of the multiple throttle body F and the fuel storage chamber I. 12. An on-off valve 7 provided at the bottom of the fuel tank T.
The fuel injection device for a motorcycle according to claim 1, wherein an upstream side of the first fuel inflow passage (U1) is connected to the on-off valve (7). 13. An on-off valve disposed at the bottom of the fuel tank T, a first fuel inflow passage 8A opening at a low position in the fuel tank T, and a second fuel inflow passage 8B opening at a middle position.
13. The fuel injection device for a motorcycle according to claim 12, wherein the on-off valve with reserve 8 is capable of switching between the two.