JP2007218159A - Fuel distribution piping structure in multiple throttle bodies - Google Patents

Abstract

In a multiple throttle body in which a plurality of throttle bodies to which a fuel injection valve is mounted are arranged adjacent to each other, a fuel distribution pipe structure having a small number of parts and assembly steps and a low manufacturing cost is provided.
A fuel distribution pipe includes a first injection valve insertion hole that opens toward one side A, a second injection valve insertion hole that opens toward the other side B, and one side A. And mounting hooks 7 and 8 projecting to the other side B. Support arm portions 11 and 12 are formed on the other side wall T1b of the first throttle body T1, and support arm portions 13 and 14 are formed on one side wall T2a of the second throttle body T2. The mounting flanges 7, 8, 9, 10 and the support arm portions 11, 12, 13, and 14 are screwed and fixed by screw members R, respectively, and the rear end portion J1b of the first fuel injection valve J1 is the first injection. The second fuel injection valve J2 is inserted and supported in the valve insertion hole 4, and the rear end portion J2b of the second fuel injection valve J2 is inserted and supported in the second injection valve insertion hole 6.
[Selection] Figure 1

Description

  The present invention relates to a fuel distribution pipe that supplies fuel boosted by a fuel source toward a fuel injection valve mounted on a throttle body, and in particular, a plurality of throttle bodies are fixedly arranged adjacent to the side, The present invention relates to a fuel distribution pipe structure in a multiple throttle body that supplies fuel to each fuel injection valve mounted on the throttle body.

A fuel distribution pipe in a conventional multiple throttle body is shown in FIG.
T1 is a first throttle body that has a first intake passage 30 penetrating therethrough, and the first intake passage 30 crosses the first intake passage 30 and passes through the first throttle body. It is opened and closed by a first throttle valve 32 attached to a first throttle valve shaft 31 that is rotatably supported at T1.
The first fuel injection valve J1 is attached to the first throttle body T1, and the first fuel injection valve J1 is sandwiched between the first throttle body T1 and the first fuel distribution pipe D1. Is done.
Specifically, the first throttle body T1 is formed with an injection valve insertion hole 33 that opens obliquely upward to the right from the intake passage 30a on the downstream side of the first throttle valve 32.
Further, the first fuel distribution pipe D1 is provided with a first injection valve insertion hole 34 opened obliquely downward to the left, and this first injection valve insertion hole 34 is provided in the fuel distribution. A first fuel introduction pipe 36 projects from the fuel distribution path 35 and opens to the outside.
The front end portion J1a of the first fuel injection valve J1 is inserted into the injection valve insertion hole 33 of the first throttle body T1, and the rear end portion J1b is the first injection valve of the first fuel distribution pipe D1. In this state, the mounting rod portion 37 that is inserted into the insertion hole 34 and protrudes to the side from the first fuel distribution pipe D1 is located on the other side B from the other side wall T1b of the first throttle body T1 via the screw 38. It is fixed to the projecting mounting support 39 by screwing.

T2 is a second throttle body having a second intake passage 40 penetrating through the inside thereof. The second intake passage 40 crosses the second intake passage 40 and passes through the second throttle body. It is opened and closed by a second throttle valve 42 attached to a second throttle valve shaft 41 that is rotatably supported at T2.
The second fuel injection valve J2 is attached to the second throttle body T2, and the second fuel injection valve J2 is sandwiched between the second throttle body T2 and the second fuel distribution pipe D2. Is done.
Specifically, an injection valve insertion hole 43 is formed in the second throttle body T2 so as to open obliquely to the left above the intake passage 40a on the downstream side of the second throttle valve 42.
Further, the second fuel distribution pipe D2 is provided with a second injection valve insertion hole 44 opened obliquely downward to the right, and this second injection valve insertion hole 44 is provided in the fuel distribution. A second fuel introduction pipe 46 projects from the fuel distribution path 45 and opens to the outside.
Then, the front end portion J2a of the second fuel injection valve J2 is inserted into the injection valve insertion hole 43 of the second throttle body T2, and the rear end portion J2b is the second injection valve of the second fuel distribution pipe D2. In this state, the mounting flange portion 47 that is inserted into the insertion hole 44 and protrudes to the side from the second fuel distribution pipe D2 is located on one side A from the one side wall T2b of the second throttle body T2 via the screw 48. It is fixed to the projecting mounting support 49 by screwing.

According to the above, a part of the fuel boosted by a fuel pump (not shown) is supplied from the first fuel introduction pipe 36 to the fuel distribution path 35 of the first fuel distribution pipe D1, and this fuel is injected into the first fuel injection pipe. Injection is supplied from the valve J1 into the intake passage 30a on the downstream side of the first throttle body T1.
The other part of the fuel boosted by the fuel pump is supplied from the second fuel introduction pipe 46 to the fuel distribution path 45 of the second fuel distribution pipe D2, and this fuel is supplied from the second fuel injection valve J2 to the second fuel injection pipe J2. 2 is injected into the intake passage 40a downstream of the throttle body T2.

  The first throttle body T1 and the second throttle body T2 are arranged adjacent to one side A and the other side B. The first throttle body T1 and the second throttle body T2 are arranged adjacent to each other. The throttle bodies T1 and T2 are disposed so as to straddle both throttle bodies, and are fixed to each other by being screwed and fixed by a first connecting stay 50 and a second connecting stay 51 formed of an angle material.

According to such a conventional multiple throttle body, the first fuel injection valve J1 is sandwiched between the first throttle body T1 and the first fuel distribution pipe D1, and the second fuel injection valve J2 is the second throttle. It is sandwiched between the body T2 and the second fuel distribution pipe D2, and it is necessary to prepare two fuel distribution pipes D1 and D2 and to screw them individually to the throttle bodies T1 and T2. And the assembly man-hour increases and the manufacturing cost cannot be reduced.
Further, the first fuel distribution pipe D1 is connected to the fuel pump through the first fuel introduction pipe 36, and the second fuel distribution pipe D2 is connected to the fuel pump through the second fuel introduction pipe 46, according to this. In addition, the number of fuel pipes becomes two and the number of piping work steps increases, and the degree of freedom of piping is hindered.
Furthermore, the first and second throttle bodies T1 and T2 provided adjacent to each other are fixed by the two connecting stays 50 and 51. According to this, it is necessary to prepare the connecting stays 50 and 51 exceptionally. The manufacturing cost cannot be reduced.

  The present invention has been made in view of the above problems, and an object thereof is to provide a fuel distribution pipe structure in an inexpensive multiple throttle body that can reduce the number of parts and the number of assembly steps.

In the fuel distribution pipe structure in the multiple throttle body according to the present invention, in order to achieve the above object, a plurality of throttle bodies having fuel injection valves are fixedly arranged adjacent to the side and directed toward each fuel injection valve. In the fuel distribution pipe structure in the multiple throttle body to which fuel is supplied from the fuel distribution pipe,
The fuel distribution pipe is connected to a fuel distribution path bored therein, and has a first injection valve insertion hole that opens toward one side;
A second injection valve insertion hole connected to the fuel distribution path and opening toward the other side;
A first attachment flange and a second attachment flange formed to protrude from one side wall toward one side, and a third attachment flange and a fourth attachment formed to protrude from the other sidewall toward the other side. A buttock, and
On the other hand, on the other side wall of the first throttle body that is adjacent, a first support arm portion and a second support arm portion that protrude toward the other side are formed to protrude and one side wall of the second throttle body that is adjacent to the first throttle body. Is formed with a third support arm portion and a fourth support arm portion protruding to one side,
The fuel distribution pipe is disposed between the other side wall of the adjacent first throttle body and the one side wall of the second throttle body, and is attached to the first throttle body in the first injection valve insertion hole. Inserting the rear end of the first fuel injection valve;
Inserting the rear end portion of the second fuel injection valve attached to the second throttle body into the second injection valve insertion hole;
Further, the first mounting collar and the first supporting arm, the second mounting collar and the first supporting arm, the third mounting collar and the third supporting arm, the fourth mounting collar and the fourth supporting arm. The first feature is that the screw member is screwed and fixed.

  According to the present invention, in addition to the first feature, a first mounting rod portion and a third mounting rod portion formed in the fuel distribution pipe are formed above the first and second injection valve insertion holes. The second feature is that the second attachment flange and the fourth attachment flange are formed at positions below the first and second injection valve insertion holes.

  Furthermore, in addition to the first feature, the present invention has a third feature in that a fuel distribution passage formed in the fuel distribution pipe is connected to a fuel pump through a single fuel introduction pipe and fuel pipe. To do.

Furthermore, the present invention adds to the first feature,
A positioning recess b and a positioning projection a are provided on the contact surface between the mounting flange and the support arm, and the positioning projection a is inserted into the positioning recess b, and the mounting flange and the support arm are inserted by the screw member R. The fourth feature is that the part is fixed by screwing.

According to the first feature of the present invention, the rear end portion of the first fuel injection valve is inserted into the first injection valve insertion hole formed in the fuel distribution pipe, and the second injection valve insertion hole is inserted into the second injection valve insertion hole. The rear end portion of the fuel injection valve is inserted.
Further, a first mounting arm part extending from one side of the fuel distribution pipe to one side, a second mounting arm part extending from the other side wall of the first throttle body to the other side, and a second supporting arm. And a third support arm part, which is fixedly screwed to the part and extends from the other side wall of the fuel distribution pipe to the other side, and a fourth attachment part extends from one side wall of the second throttle body to one side. The fourth support arm is screwed and fixed.
Further, the fuel introduction pipe of the fuel distribution pipe is connected to the fuel pump through a single fuel pipe.
According to the above, since the rear end portion of the first fuel injection valve and the rear end portion of the second fuel injection valve are sandwiched by the single fuel distribution pipe, the number of parts can be reduced.
Also, the first and second throttle bodies that are provided next to each other are fixedly arranged by screwing a mounting arm portion formed integrally with the fuel distribution pipe and a support arm portion formed integrally with the throttle body with a screw member. Therefore, according to this, it is not necessary to prepare a special connecting member, and the number of parts can be reduced.
In addition, the screwing operation of the fuel distribution pipe to the throttle body and the fixing operation of the adjacent throttle body are completed simultaneously by screwing the attachment arm of the fuel distribution pipe and the support arm of the throttle body with the screw member. As a result, the assembly man-hours can be reduced.
Furthermore, since the fuel distribution pipe and the fuel pump are connected with a single fuel introduction pipe and a single fuel pipe, it is possible to reduce the number of man-hours for connecting the fuel pipe and the pipe and improve the degree of freedom of the arrangement of the fuel pipe. This is particularly effective in a case where the storage space is narrowly limited, such as a motorcycle.

According to the second feature of the present invention, the first and third attachment flanges are formed at positions above the first and second injection valve insertion holes of the fuel distribution pipe, and the first and third attachment flanges are formed. Are screwed and fixed to the first and third support arm portions of the first and second throttle bodies via screw members, while the second and second fuel injection pipes are positioned below the first and second injection valve insertion holes. A fourth attachment hook is formed, and the second and fourth attachment hooks are screwed and fixed to the second and fourth support arm portions of the first and second throttle bodies via screw members.
According to the above, since the fuel distribution pipe is screwed and fixed to the first and second throttle bodies in the vertical direction across the first and second injection valve insertion holes, the first fuel by the first injection valve insertion hole Insertion support of the rear end portion of the injection valve and insertion support of the rear end portion of the second fuel injection valve by the second injection valve insertion hole can be reliably performed.

  Further, according to the third feature of the present invention, since the fuel distribution pipe and the fuel pump are connected by a single fuel introduction pipe and a single fuel pipe, the connection time of the fuel pipe and the pipe can be reduced and the fuel can be reduced. The degree of freedom of arrangement of the pipes can be improved, and this is effective particularly in a case where the storage space is narrowly limited like a two-wheeled vehicle.

  Furthermore, according to the fourth aspect of the present invention, the first throttle body and the second throttle body can be positioned and fixed more accurately and firmly.

An embodiment of a fuel distribution pipe structure in a multiple throttle body according to the present invention will be described below with reference to FIG.
Since the first throttle body, the second throttle body, the first fuel injection valve, and the second fuel injection valve have the same structure as the conventional one, the reference numerals in FIG. 2 are used as they are.
Reference numeral 1 denotes a fuel distribution pipe. A fuel distribution path 2 is formed in the inside, and the fuel distribution path 2 is opened outward with a single fuel introduction pipe 3.
The fuel distribution pipe 1 has a first injection valve insertion hole 4 that opens obliquely downward to the left. The first injection valve insertion hole 4 is connected to the fuel distribution path 2 with a flow path 5, and obliquely downward to the right. The second injection valve insertion hole 6 opens toward the end, and the second injection valve insertion hole 6 is connected to the fuel distribution path 2 through a flow path 17.
That is, in the fuel distribution pipe 1, the first injection valve insertion hole 4 opens obliquely downward to the left from the fuel distribution path 2 and the second injection valve insertion hole 6 opens obliquely downward to the right.
Further, the fuel distribution pipe 1 is formed with a base portion extending in the vertical direction, and the first attachment flange portion 7 and the second attachment flange portion 8 are integrally formed on the one side wall 2a toward the one side A. It is formed.
In addition, a third attachment flange 9 and a fourth attachment flange 10 are integrally formed on the other side wall 2b toward the other side B.
Here, the first attachment flange 7 and the third attachment flange 9 are formed above the first and second injection valve insertion holes 4, 6, and the second attachment flange 8, the fourth attachment flange 9 10 is formed above the first and second injection valve insertion holes 4 and 6.
In other words, the first attachment flange 7 and the second attachment flange 8 are formed across the first injection valve insertion hole 4, and the third attachment flange 9 and the fourth attachment flange 10 are the second injection. It is formed across the valve insertion hole 6.

On the other side wall T1b of the first throttle body T1 (on the side where the first fuel injection valve J1 is mounted), the second side B faces the other side B and contacts the first mounting flange 7 of the fuel distribution pipe 1. A first support arm portion 11 is formed so as to protrude, and a second support arm portion 12 that protrudes toward the other side B and abuts against the second mounting flange portion 8 of the fuel distribution pipe 1 is formed.
Further, one side wall T2a of the second throttle body T2 (on the side on which the second fuel injection valve J2 is mounted) contacts the third mounting flange 9 of the fuel distribution pipe 1 toward one side A. A third support arm portion 13 is formed so as to protrude, and a fourth support arm portion 14 is formed so as to protrude toward one side A and abut against the fourth mounting flange portion 10 of the fuel distribution pipe 1.

The other side wall T1b of the first throttle body T1 and the one side wall T2a of the second throttle body T2 are arranged to face each other, and the fuel distribution pipe 1 is arranged in the facing space between the other side wall and the one side wall T2a. In this state, the rear end portion J1b of the first fuel injection valve J1 is inserted into the first injection valve insertion hole 4, and the rear end portion J2b of the second fuel injection valve J2 is inserted into the second injection valve insertion hole 6. Inserted and placed inside.
In such a state, the first mounting flange portion 7 and the first support arm portion 11 are screwed and fixed by the screw member R made of a bolt and a nut, and the second mounting flange portion 8 and the second support arm portion 12 are connected. The third attachment flange 9 and the third support arm 13 are screwed and fixed by the screw member R, and the fourth attachment flange 10 and the fourth support arm 14 are fixed by the screw member R. Screwed and fixed by R.

According to the above, the first throttle body T1 and the second throttle body T2 are the first attachment flange 7, the first support arm 11, the second attachment flange 8, the second support arm 12, The third attachment flange 9 and the third support arm 13 and the fourth attachment flange 10 and the fourth support arm 14 are fixedly arranged.
On the other hand, the first fuel injection valve J1 is sandwiched between the injection valve insertion hole 33 of the first throttle body T1 and the first injection valve insertion hole 4 of the fuel distribution pipe 1, and the second fuel injection valve J2 is It is clamped by the injection valve insertion hole 43 of the second throttle body T2 and the second injection valve insertion hole 6 of the fuel distribution pipe 1.

The fuel introduction pipe 3 of the fuel distribution pipe 1 is connected to a fuel pump (not shown) with a single fuel pipe 16. According to this, the fuel boosted by the fuel pump is supplied to the fuel pipe 16 and the fuel introduction pipe 3. Is supplied to the fuel distribution path 2 of the fuel distribution pipe 1, and a part of the fuel in the fuel distribution path 2 is supplied to the first fuel injection valve J1, and the first throttle body is supplied from the first fuel injection valve J1. The fuel is injected and supplied into the intake passage 30a on the downstream side of T1.
On the other hand, the fuel in the other part of the fuel distribution path 2 is supplied to the second fuel injection valve J2, and is injected and supplied from the second fuel injection valve J2 into the intake passage 40a on the downstream side of the second throttle body T2.

As described above, according to the fuel distribution pipe structure in the multiple throttle body according to the present invention, the adjacent first throttle body T1 and second throttle body T2 are formed integrally with the fuel distribution pipe 1. First, second, third, and fourth support arms formed integrally with the second, third, and fourth mounting flanges 7, 8, 9, and 10, and the first and second throttle bodies T1 and T2. Since the parts 11, 12, 13, and 14 can be fixedly arranged by screwing them with the screw member R, it is not necessary to prepare a special mounting stay, and the number of parts can be reduced.
Further, according to the screwing by the screw member, the first and second throttle bodies T1 and T2 provided adjacent to each other and the fuel distribution pipe 1 can be fixed to the throttle body at the same time. Work can be reduced.
The first and second fuel injection valves J1 and J2 are attached to the single fuel distribution pipe 1 and can receive the fuel supply from the single fuel distribution pipe 1. According to this, One fuel distribution pipe 1 may be prepared, and the number of parts can be reduced.
Further, since the fuel distribution pipe 1 is connected to the fuel pump with the single fuel introduction pipe 3 and the single fuel pipe 16, the piping work can be easily performed, and in particular, the fuel pipe 16 can be freely connected. The degree can be improved.
This is particularly effective in a case where the throttle body is disposed in a narrow storage space surrounded by a fuel tank or an engine, such as a motorcycle.
Further, the single fuel pipe 16 can improve the appearance of the motorcycle.
Further, a first attachment flange 7 and a third attachment flange 9 formed integrally with the fuel distribution pipe 1 are formed at positions above the first injection valve insertion hole 4 and the second injection valve insertion hole 6 of the fuel distribution pipe 1. According to the second mounting flange 8 and the fourth mounting flange 10 formed below the first injection valve insertion hole 4 and the second injection valve insertion hole 6, the injection valve insertion holes 4 and 6 In the sandwiched vertical direction, each mounting flange is screwed and fixed to each support arm, and this can reliably prevent the first and second injection valve insertion holes 4 and 6 from shaking, The second fuel injection valves J1 and J2 can be reliably inserted and supported.

In the above embodiment, the longitudinal axes XX and YY of the intake passages of the throttle bodies are arranged in parallel, but they may be arranged in an intersecting manner, and the first injection valve insertion holes 4, The second injection valve insertion hole 6 may be formed with a deviation in the front and back direction in FIG.
Further, the first, second, third, and fourth mounting flanges 7, 8, 9, and 10 integrally formed with the fuel distribution pipe 1 and the first and second throttle bodies T1 and T2 are integrally formed. When the first, second, third, and fourth support arm portions 11, 12, 13, and 14 are screwed and fixed by the screw member R, as shown in FIG. When a positioning projection a and a positioning recess b are provided on each of the contact surfaces, and the positioning projection a is inserted into the positioning recess b and screwed and fixed by the screw member R, the first throttle body T1 and the second throttle body T1 The throttle body T2 can be positioned and fixed more accurately and firmly.
In addition, the positioning protrusion a and the positioning recess b may be provided on any contact surface of the support arm portion or the attachment flange portion.

The principal part longitudinal cross-sectional view which shows one Example of the fuel distribution piping structure in the multiple throttle body which becomes this invention. The principal part longitudinal cross-sectional view in the CC line of FIG. The principal part longitudinal cross-sectional view which shows the fuel distribution piping structure in the conventional multiple throttle body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel distribution pipe 2 Fuel distribution path 4 1st injection valve insertion hole 6 2nd injection valve insertion hole 7 1st attachment collar part 8 2nd attachment collar part 9 3rd attachment collar part 10 4th attachment collar part 11 1st support arm Part 12 Second support arm part 13 Third support arm part 14 Fourth support arm part J1 First fuel injection valve J2 Second fuel injection valve T1 First throttle body T2 Second throttle body

Claims (4)

In a fuel distribution pipe structure in a multiple throttle body in which a plurality of throttle bodies including fuel injection valves are arranged side by side adjacent to each other and fuel is supplied from the fuel distribution pipes toward each fuel injection valve.
The fuel distribution pipe 1 is connected to a fuel distribution path 2 drilled inside, and has a first injection valve insertion hole 4 that opens toward one side A,
A second injection valve insertion hole 6 that continues to the fuel distribution path 2 and opens toward the other side B;
A first attachment flange 7 and a second attachment flange 8 formed to protrude from one side wall 2a toward one side A, and a third attachment formed to protrude from the other side wall 2b toward the other side B. A flange 9 and a fourth mounting flange 10;
On the other hand, on the other side wall T1b of the first throttle body T1 that is provided adjacently, a first support arm portion 11 and a second support arm portion 12 that protrude toward the other side B are formed so as to protrude and adjacent to the second side wall T1b. On one side wall T2a of the throttle body T2, a third support arm portion 13 and a fourth support arm portion 14 directed to one side A are formed to protrude.
The fuel distribution pipe is disposed between the other side wall T1b of the adjacent first throttle body T1 and the one side wall T2a of the second throttle body T2, and the first throttle is inserted into the first injection valve insertion hole 4. Insert the rear end J1b of the first fuel injection valve J1 attached to the body T1,
Insert the rear end portion J2b of the second fuel injection valve J2 attached to the second throttle body T2 into the second injection valve insertion hole 6,
Further, the first mounting collar 7 and the first support arm 11, the second mounting collar 8 and the second support arm 12, the third mounting collar 9, the third support arm 13, and the fourth mounting collar 10 A fuel distribution pipe structure in a multiple throttle body, wherein the fourth support arm portion 14 is screwed and fixed by a screw member R.   A first attachment flange 7 and a third attachment flange 9 formed in the fuel distribution pipe are formed at positions above the first and second injection valve insertion holes 4, 6, and the second attachment flange 8, 4. A fuel distribution pipe structure in a multiple throttle body according to claim 1, wherein the four mounting flanges are formed at positions below the first and second injection valve insertion holes.   2. A fuel distribution pipe in a multiple throttle body according to claim 1, wherein the fuel distribution path formed in the fuel distribution pipe is connected to a fuel pump through a single fuel introduction pipe and a fuel pipe. Construction. A positioning recess b and a positioning projection a are provided on the contact surface between the mounting flange and the support arm, and the positioning projection a is inserted into the positioning recess b, and the mounting flange and the support arm are inserted by the screw member R. 2. The fuel distribution pipe structure in a multiple throttle body according to claim 1, wherein the portion is fixed by screwing.

Images