JP4074941B2 - Mounting structure of fuel injection valve - Google Patents

Description

  The present invention relates to a fuel injection device in which fuel boosted by a fuel pump is supplied to a fuel distribution pipe, and this fuel is injected and supplied into an intake pipe connected to an engine via a fuel injection valve attached to the fuel distribution pipe. In particular, the present invention relates to a structure for mounting a fuel injection valve to a fuel distribution pipe.

In such a fuel injection device, for the purpose of improving the output of the engine, a throttle body having an intake passage is disposed toward each cylinder of the engine, and the first fuel injection valve and the second fuel injection are provided in each intake passage. The opening of the valve is performed.
More specifically, the first fuel injection valve is disposed to open toward the intake passage on the downstream side of the throttle valve, and the second fuel injection valve is disposed to open on the intake passage on the upstream side of the throttle valve. The fuel supply from the first fuel injection valve is received from the low opening to the high opening range of the throttle valve, and the second fuel injection is added to the fuel supply of the first fuel injection valve to the high opening range of the throttle valve. Fuel is supplied from the valve, which increases engine output.

As described above, the first and second fuel injection valves are provided in the single throttle body, and the structure for attaching these fuel injection valves to the fuel distribution pipe and the fuel routing structure in the fuel distribution pipe are disclosed in, for example, It is shown in the 97132 gazette. In the following description, the symbols described in the above specification are used.
According to this, the first fuel injection valve 4 is opened in the intake passage downstream of the throttle valve in the intake passage connected to each cylinder of the engine, and is connected to the upstream side of the intake passage. Two fuel injection valves 11 are arranged open.
The first fuel injection valve 4 is attached to a first fuel pipe 13 fixed to the intake passage 2, and the second fuel injection valve 11 is attached to a second fuel pipe 14 fixed to the funnel 6. To be placed.
The fuel boosted by the fuel pump is supplied to the fuel supply pipe 15, and a part of the fuel in the fuel supply pipe 15 is supplied to the second fuel pipe 14 via the forward pipe 15a. The fuel inside is supplied into the air funnel 6 and the intake passage 2 via the second fuel injection valve 11.
On the other hand, the other part of the fuel in the fuel supply passage 15 is supplied to the first fuel pipe 13 via the forward pipe 15 b, and the fuel in the first fuel pipe 13 passes through the first fuel injection valve 4 to the intake passage 2. Supplied in.
The fuel in the second fuel pipe 14 is returned to the first fuel pipe 13 through the return pipe 16a, and the fuel in the first fuel pipe 13 is returned to the fuel tank through the return pipe 16b.
JP 2000-97132 A

According to such a conventional fuel injection valve mounting structure and fuel routing structure, the first fuel pipe 13 is fixedly disposed on the lower outer periphery of the intake passage 2, and the second fuel pipe 14 is fixed on the funnel 6 via bolts 20. The first and second fuel pipes 13 and 14 are separately fixedly disposed on the intake passage 2 and the funnel 6.
According to the above, the man-hours for attaching the fuel pipes 13 and 14 are increased, and attachment members such as screws are required, so that the manufacturing cost cannot be effectively reduced.
Further, according to the above, it is necessary to remove the fuel pipes 13 and 14 at the time of maintenance, and the maintenance workability is poor.
Further, the fuel supply pipe 15 and the first fuel pipe 13 are connected by the forward pipe 15b, and the fuel supply pipe 15 and the second fuel pipe 14 are connected by the forward pipe 15a. In particular, simplification of fuel piping is required for mounting on vehicles.
Further, the first fuel pipe 13 and the second fuel pipe 14 are arranged so as to be largely separated (the first fuel pipe 13 is arranged below and the second fuel pipe 14 is arranged above), so the first fuel pipe 13 and the second fuel pipe 14, the return pipe 16a becomes longer, and after the first fuel pipe 13 is attached to the intake passage 2 and the second fuel pipe 14 is attached to the funnel 6. As a result, the mounting workability of the return pipe 16a is inferior.

  The present invention has been made in view of the above problems, and a single throttle body having an intake passage drilled toward each cylinder of the engine is connected, and the first fuel injection valve is connected to the intake passage downstream of the throttle valve. And a second fuel injection valve disposed in the intake passage upstream of the throttle valve, the first fuel pipe for attaching and supporting the first fuel injection valve and the second fuel injection valve are removed. To provide a fuel injection valve mounting structure in which a second fuel pipe to be attached and supported can be attached to a throttle body very easily and fuel can be easily routed including the first fuel pipe and the second fuel pipe. is there.

In order to achieve the above object, the fuel injection valve mounting structure according to the present invention includes a single throttle body in which an intake passage is formed by penetrating through the inside and the intake passage is opened and closed by a throttle valve.
A first fuel injection valve that is disposed with the fuel injection portion opened in the intake passage downstream of the throttle valve, and a second fuel injection valve that is disposed with the fuel injection portion opened in the intake passage upstream of the throttle valve And the longitudinal axis of the first and second fuel injection valves are arranged from the same direction toward the intake passage,
On the other hand, the fuel distribution pipe includes a fuel inlet hole that is inserted and connected to the fuel inlet portion of the first fuel injection valve, a first fuel pipe that includes a pressure regulator at one end opening, and a fuel inlet portion of the second fuel injection valve. a second fuel tube with the fuel supply passage, are arranged in parallel on one end opening of provided with a fuel inlet hole to be inserted into and connected to the further flow path connected with a connecting pipe to the first fuel pipe and the second fuel pipe Being integrally formed,
Further, the fixing member is formed upward from both ends of the bottom portion, and is formed in a U-shape with an upper end opened, and a first press bending portion covering the upper portion of the first fuel pipe is formed at one upper end. A second press-bending portion that covers the upper portion of the second fuel pipe is formed at the other upper end, and an attachment hole is formed in the bottom portion, via an attachment hole formed in the bottom portion of the fixing member. By screwing the fixing member to the single throttle body, the first fuel injection valve is held by the first fuel pipe and the single throttle body, and the second fuel injection valve is single- ended with the second fuel pipe . The first feature is that it is held by the throttle body.

According to the present invention, in addition to the first feature, each of the first throttle body and the second throttle body having the first fuel injection valve and the second fuel injection valve has a longitudinal axis W of the intake passage. -It is arranged in the side with -W in parallel,
The first fuel pipe of the fuel distribution pipe is provided with a fuel inlet hole inserted and connected to each fuel inlet of each of the plurality of first fuel injection valves adjacent to the side, and the second fuel pipe has a side. A fuel inlet hole inserted and connected to each fuel inlet portion of a plurality of second fuel injection valves adjacent to
Further, the first fuel pipe and the second fuel pipe are connected to each other with a plurality of connecting pipes,
Two fixing members are prepared,
By screwing one fixing member to the first throttle body via an attachment hole drilled in the bottom of one fixing member,
The first fuel injection valve is sandwiched between the first fuel pipe and the first throttle body, and the second fuel injection valve is sandwiched between the second fuel pipe and the first throttle body, and further drilled in the bottom of the other fixing member. By screwing the other fixing member to the second throttle body through the mounting hole formed, the first fuel injection valve is sandwiched between the first fuel pipe and the second throttle body, and the second fuel injection valve is that it has held between the second fuel pipe and the second throttle body and the second feature.

According to the first feature of the present invention, the first fuel injection valve disposed in the intake passage downstream of the throttle valve and the second fuel injection valve disposed in the intake passage upstream of the throttle valve are The longitudinal axis is disposed in the same direction with respect to the intake passage formed in the throttle body.
According to this, the fuel inlet part of the first fuel injection valve and the fuel inlet part of the second fuel injection valve are arranged in the same direction and can be arranged close to each other.
On the other hand, the fuel distribution pipe has a fuel inlet hole into which the fuel inlet portion of the first fuel injection valve is inserted and a first fuel pipe having a pressure regulator at one end opening, and a fuel inlet portion of the second fuel injection valve. A second fuel pipe having a fuel inlet hole to be inserted and having a fuel supply passage at one end opening, and a connecting pipe for connecting the first fuel pipe and the second fuel pipe to each other and formed integrally with each other The first fuel pipe and the second fuel pipe are arranged in parallel and integrally formed.
Thus, the first fuel injection valve and the second fuel injection valve are arranged on the throttle body, and then the fuel inlet hole of the first fuel pipe is inserted and arranged toward the fuel inlet portion of the first fuel injection valve. By inserting and arranging the fuel inlet hole of the second fuel pipe toward the fuel inlet of the second fuel injection valve, the first and second fuel injection valves can be attached to the fuel distribution pipe by a single operation.
In this state, the fuel distribution pipe is fixed to a single throttle body with a fixing member, whereby the first fuel injection valve is held between the first fuel pipe and the single throttle body, and the second fuel The injection valve is held between the second fuel pipe and a single throttle body.
According to the above, the single fuel distribution pipe in which the first fuel pipe and the second fuel pipe are integrally formed is attached toward the first and second fuel injection valves, and the fuel distribution pipe has the fixing member. By adhering to a single throttle body, the first and second fuel injection valves can be attached to the single throttle body at the same time.
Thus, the first fuel distribution pipe, first, second fuel injection valves by a single securing work to a single throttle body by fixing members for a single attachment work and the fuel distribution pipe to the second fuel injection valve Since the mounting operation for the single throttle body can be completed, the mounting operation of the fuel injection valve and the fixing operation of the fuel distribution pipe can be performed extremely easily and in a short time, and the manufacturing cost can be greatly reduced.
Further, during the maintenance work of the first and second fuel injection valves, the first and second fuel injection valves can be removed from the single throttle body at the same time by removing the fixed member and the fuel distribution pipe. Therefore, maintenance workability can be improved.

On the other hand, the fuel inflow pipe connected to the discharge path of the fuel pump is connected to the fuel supply path of the second fuel pipe of the fuel distribution pipe, and the return hole of the pressure regulator attached to the first fuel pipe has a return fuel pipe. Connected to the tank.
Thus, the fuel in the fuel tank is boosted by the fuel pump, and the boosted fuel is supplied to the fuel distribution pipe via the discharge path and the fuel inflow pipe. At this time, the fuel supply path of the fuel distribution pipe is supplied to the fuel supply path. The inflowing fuel reaches the first fuel pipe via the second fuel pipe and the connecting pipe, the fuel in the second fuel pipe is supplied toward the second fuel injection valve, and the fuel in the first fuel pipe is the first fuel pipe. Supplied toward the fuel injection valve.
On the other hand, the fuel in the first fuel pipe is supplied into the pressure regulator, whereby the fuel pressure in the first and second fuel pipes is regulated to a predetermined pressure. The surplus fuel in the pressure regulator is returned to the return hole, the return It is returned to the fuel tank via the fuel pipe.
According to the above, since the connecting pipe that connects the first fuel pipe and the second fuel pipe is previously fixed to the first fuel pipe and the second fuel pipe and integrally formed, there is no need to connect the connecting pipe. .
In addition, since the fuel pipe only needs to connect the fuel inflow pipe to the fuel supply path and the return fuel pipe to the return hole, the pipe connection work can be easily performed.
In addition, the fixing member that fixes the fuel distribution pipe toward the throttle body is formed in a U-shape that opens upward, the first pressing bent portion is formed at one upper end, and the second pressing portion is formed at the other upper end. An attachment hole is drilled in the bottom.
Accordingly, the first pressing bent portion is arranged so as to cover the upper portion of the first fuel pipe, and the second pressing bent portion is arranged so as to cover the upper portion of the second fuel pipe, and in this state, the screw passes through the attachment hole in the bottom portion. The member can be screwed to the throttle body, whereby the fuel distribution pipe can be fixed to the throttle body, and the fuel distribution pipe can be fixed by a single fixing operation with a very simple fixing member.

According to the second aspect of the present invention, a plurality of single throttle bodies are prepared, and the longitudinal axes of the intake passages of the first and second throttle bodies are arranged in parallel and adjacent to the sides. Is done.
Accordingly, the first fuel injection valves and the second fuel injection valves arranged in the first and second throttle bodies are arranged at the same position on the side.
Further, the fuel distribution pipe is formed by integrally forming a first fuel pipe, a second fuel pipe, and a plurality of connecting pipes. The first fuel pipe includes a plurality of fuel inlets facing each fuel inlet portion of the plurality of first fuel injection valves. The fuel inlet holes are provided laterally, and the second fuel pipe is provided with a plurality of fuel inlet holes facing the respective fuel inlet portions of the plurality of second fuel injection valves.
According to the above, each fuel inlet hole of the first fuel pipe formed as a single fuel distribution pipe is inserted into the fuel inlet portion of the first fuel injection valve of the first and second throttle bodies, and the second fuel pipe These fuel inlet holes are inserted into the fuel inlet portions of the second fuel injection valves of the first and second throttle bodies, so that fuel distribution pipes can be attached to all the fuel injection valves.
Therefore, the mounting of the plurality of fuel injection valves and the fuel distribution pipe can be completed by a single mounting operation.
Also in the fuel pipe, each first fuel injection valve adjacent to the side is connected by a first fuel pipe, and each second fuel injection valve adjacent to the side is connected by a second fuel pipe. Since the flow paths are connected, the flow paths of adjacent fuel injection valves can be easily connected.
In the above, since the first fuel pipe and the second fuel pipe are connected to each other through a plurality of connecting pipes, the fuel flowing from the fuel supply path into the second fuel pipe can be supplied into the first fuel pipe without time delay. . Further, a plurality of connecting pipes are opened in the first fuel pipe located on the downstream side, and in particular, the effect of facilitating the vapor discharge to the return fuel pipe by being able to stir the vapor that tends to stay in the first fuel pipe on the downstream side. Have

A fuel injection valve mounting structure according to a first embodiment of the present invention will be described below with reference to the drawings.
Referring to FIG. 1, reference numeral 1 denotes a single throttle body having an intake passage 2 formed therethrough, and the intake passage 2 is a throttle valve shaft 3 that is rotatably supported by the throttle body 1. It is opened and closed by a butterfly-type throttle valve 4 attached to. The throttle valve shaft 3 is rotated in the forward and reverse directions when a throttle drum 5 (disclosed in FIG. 8 to be described later) disposed at the end thereof is operated by the driver.
The intake passage 2 is divided into an intake passage 2a downstream of the throttle valve 4 and an intake passage 2b upstream of the throttle valve 4 by the throttle valve 4, and the downstream intake passage 2a is The cylinder is connected to an engine cylinder (not shown), and the upstream intake passage 2b is connected to an air cleaner (not shown).
The fuel injection valve J is a known electromagnetic fuel injection valve. The fuel injection valve J includes a fuel injection portion Ja at a front end portion thereof, a fuel inlet portion Jb at a rear end portion thereof, and includes a fuel injection portion Ja and a fuel inlet portion Jb. A coupler Jd is formed to protrude laterally on the outer periphery of the housing Jc.
In addition, the valve body, the movable core, the electromagnetic coil, the movable core spring, etc. which are arranged inside the above-described configuration are not shown.
Two such fuel injection valves J are prepared. The first fuel injection valve J1 injects and supplies fuel to the engine in the entire range from the low opening to the high opening of the throttle valve 4, and the second fuel injection valve J2 The fuel is injected and supplied to the engine mainly by supplementing the fuel supply amount of the first fuel injection valve in the high opening range of the throttle valve 4.
The first fuel injection valve J1 injects fuel into the intake passage 2a on the downstream side of the throttle valve 4 in accordance with the fuel injection sharing with respect to the throttle valve opening of the first and second fuel injection valves J1 and J2. The portion Ja is opened, and the fuel injection portion Ja of the second fuel injection valve J2 is opened toward the intake passage 2b upstream of the throttle valve 4.
Here, in order to specify the opening position of the first and second fuel injection valves J1, J2 into the intake passage 2, the upper part of the single throttle body 1 (referred to as the upper part in FIG. 1) A first injection guide hole 5a and a second injection guide hole 5b for inserting and supporting and positioning the fuel injection portion Ja of the fuel injection valves J1 and J2 are formed.
The first injection guide hole 5a opens into the intake passage 2a on the downstream side of the throttle valve 4, and is drilled at an inclination angle of S degrees with respect to the longitudinal axis W-W of the intake passage 2 in FIG. Is done.
The second injection guide hole 5a opens toward the intake passage 2b upstream of the throttle valve 4, and has an inclination angle of S degrees with respect to the longitudinal axis WW of the intake passage 2 in FIG. Drilled.
Further, the first and second injection guide holes 5 a and 5 b are formed on the same cross section of the throttle body 1.
That is, the first and second injection guide holes 5a and 5b are formed in parallel on the same cross section of the throttle body 1 with the same inclination angle S degree.

Next, the fuel distribution pipe 6 will be described with reference to FIGS.
2 is a top plan view including a partial cross-sectional view of the fuel distribution pipe, and FIG. 3 is a vertical cross-sectional view taken along line AA in FIG.
The fuel distribution pipe 6 includes a first fuel pipe 7 extending in the horizontal direction in FIG. 2 and a second fuel pipe 8 extending in the horizontal direction and parallel to the first fuel pipe 7. The other end (the right end in FIG. 2) of the fuel pipes 7 and 8 is closed and one end (the left end in FIG. 2) is opened to form the other end of the closed first and second fuel pipes 7 and 8. The vicinity is connected to the flow path by a connecting pipe 9.
Further, the first fuel pipe 7 is opened obliquely downward, and a first fuel inlet hole 7a into which the fuel inlet portion Jb of the first fuel injection valve J1 is inserted is formed. A second fuel inlet hole 8a is formed that opens obliquely downward and into which the fuel inlet 7b of the second fuel injection valve J2 is inserted.
The first and second fuel inlet holes 7a and 8a open in parallel in the same direction on the same cross section, and the upper portions thereof communicate with the first and second fuel pipes 7 and 8, respectively.
Also, a known pressure regulator R is disposed at the opening at one end of the first fuel pipe 7, and the opening at one end of the first fuel pipe 7 is connected to the fuel chamber Ra of the pressure regulator R so as to be connected to the fuel chamber. A return hole Rc that opens outward is connected to the valve hole Rb that opens facing Ra.
Further, a fuel supply path 10 is connected to an opening at one end of the second fuel pipe 8.

Next, the fixing member 11 for fixing the fuel distribution pipe 6 to the single throttle body 1 will be described with reference to FIGS.
4 is a top plan view of the fixing member, and FIG. 5 is a longitudinal sectional view taken along line BB of FIG.
The fixing member 11 is formed of a bottom portion 11a and a pair of side portions 11b and 11c which are bent upward from both ends of the bottom portion 11a and open at the upper end, and have a U-shape.
Then, a semicircular first press bending portion 11d covering the upper outer periphery of the first fuel pipe 7 is bent inward at the upper end of the one side portion 11b, and the other side portion 11c. A semi-circular second press bending part 11e is formed at the upper end of the second fuel pipe 8 so as to cover the upper outer periphery of the second fuel pipe 8, and an attachment hole 11f is formed at the approximate center of the bottom part 11a. The

The first and second fuel injection valves J1, J2 are attached to the single throttle body 1 by the following.
1 is a longitudinal sectional view (corresponding to a longitudinal sectional view taken along the line CC in FIG. 6) in a state where the first and second fuel injection valves J1, J2 are attached to a single throttle body 1. FIG. 1 is a top plan view of FIG. 1, and FIG. 7 is a longitudinal sectional view of a main part taken along line DD of FIG.
The fuel injection part Ja of the first fuel injection valve J1 is inserted and arranged in the first injection guide hole 5a of the single throttle body 1, and the fuel injection part Ja of the second fuel injection valve J2 is the single throttle body 1. It is inserted and arranged in the second injection guide hole 5b.
According to the above, the first fuel injection valve J1 has the longitudinal axis X1-X1 inserted with the inclination angle S with respect to the longitudinal axis WW of the intake passage 2 of the single throttle body 1, and the second In the fuel injection valve J2, the longitudinal axis X2-X2 is inserted with an inclination angle S degree with respect to the longitudinal axis WW, and the first and second fuel injection valves J1, J2 are in the insertion state. Retained.
Therefore, the fuel injection portion Ja of the first fuel injection valve J1 is disposed facing the intake passage 2a downstream of the throttle valve 4, and the fuel injection portion Ja of the second fuel injection valve J2 is upstream of the throttle valve 4. It is arranged facing the intake passage 2b.
At this time, the first and second fuel injection valves J1, J2 are disposed on the same cross section, and the longitudinal axis X1-X1 and X2-X2 of each fuel injection valve J1, J2 have the same inclination angle (S Are arranged in parallel with each other.

Next, the fuel distribution pipe 6 is inserted into the fuel inlet Jb of the fuel injection valve J, and the first fuel inlet hole 7a of the first fuel pipe 7 is inserted into the fuel inlet Jb of the first fuel injection valve J1. The second fuel inlet hole 8a of the second fuel pipe 8 is inserted into the fuel inlet portion Jb of the second fuel injection valve J2.
Next, the fixing member 11 is mounted toward the fuel distribution pipe 6, the first pressing bent portion 11 d is arranged on the upper outer peripheral surface of the first fuel pipe 7, and the second pressing bent portion 11 e is the first pressing bent portion 11 e. 2 The fuel pipe 8 is disposed on the upper outer peripheral surface, and the bottom 11a is disposed on the flat surface of the mounting boss 12 erected on the single throttle body 1. In this state, the screw member 13 is mounted on the mounting hole. A single throttle body 1 is fixed by being screwed into a female screw hole 12a formed in the mounting boss 12 through 11f. (This state is shown in FIG. 3)

According to the above, the first fuel injection valve J1 has the front fuel injection portion Ja inserted and supported in the first injection guide hole 5a of the single throttle body 1, and the rear fuel inlet Jb is the first fuel. The first fuel injection valve J1 is inserted and supported in the first fuel inlet hole 7a of the pipe 7, and the first fuel injection valve J1 has a single throttle body 1 and a fixing member 11 in the longitudinal axis X1-X1 direction of the first fuel injection valve J1. The first pressing bent portion 11d is sandwiched and fixed.
On the other hand, the second fuel injection valve J2 has a fuel injection portion Ja at its front end inserted and supported in the second injection guide hole 5b of the single throttle body 1, and a fuel inlet portion Jb at the rear end thereof is connected to the second fuel pipe 8. is inserted into and supported in the second fuel inlet hole 8a of the second fuel injection valve J2 is the longitudinal axial line X2-X2 direction of the second fuel injection valve J2, the single throttle body 1 and the fixing member 11 It is pinched and fixed by the 2 press bending part 11e.

The fuel pipe is connected to the fuel distribution pipe 8 fixed to the single throttle body 1 by the following.
A fuel inflow pipe 14 connected to a discharge hole of a fuel pump (not shown) is connected to the fuel supply path 10, and a return fuel pipe 15 connected to a fuel tank (not shown) is connected to the return hole Rc.

According to the above, the fuel in the fuel tank is sucked into the fuel pump and boosted, and the boosted fuel is supplied to the second fuel pipe 8 via the fuel inflow pipe 14 and the fuel supply path 10.
The fuel in the second fuel pipe 8 is supplied into the first fuel pipe 7 through the connecting pipe 9, and the fuel in the first fuel pipe 7 is introduced into the fuel chamber Ra of the pressure regulator R. The fuel pressure is regulated by the pressure regulator R, so that the fuel in the first and second fuel pipes 7 and 8 is regulated to a predetermined fuel pressure.
The surplus fuel in the pressure regulator R during the pressure adjustment is returned to the fuel tank via the return hole Rc and the return fuel pipe 15.
Therefore, the first fuel injection valve J1 supplies the fuel in the first fuel pipe 7 toward the intake passage 2a on the downstream side of the throttle valve, while the second fuel injection valve J2 is the fuel in the second fuel pipe 8. Can be supplied toward the intake passage 2b upstream of the throttle valve.

According to the above, the longitudinal axis X1-X1 and X2-X2 of the first and second fuel injection valves J1, J2 are arranged in the same direction toward the intake passage 2. The fuel distribution pipe 6 is formed integrally with the first and second fuel pipes 7 and 8 and the connecting pipe 9 in advance, the first fuel pipe 7 is provided with the first fuel inlet hole 7a, and the second fuel pipe 8 is provided with the second fuel. Since the inlet hole 8a is provided, the first step of attaching the first and second fuel injection valves J1 and J2 to the throttle body 1 and a single fuel toward the first and second fuel injection valves J1 and J2. The first and second fuel injection valves J1, J2 are fueled by the second step of mounting the distribution pipe 6 and the third step of fixing the single fuel distribution pipe 6 to the single throttle body 1 by the fixing member 11. Since it can be attached to the single throttle body 1 via the distribution pipe 6, the mounting operation can be performed in a very short time and easily, and the manufacturing cost can be reduced.
Even during the maintenance work of the first and second fuel injection valves J1 and J2, the single fuel distribution pipe 6 and the first and second fuel injections are simply removed by removing the fixing means 11 from the single throttle body 1. Since the valves J1 and J2 can be removed, the maintainability can be greatly improved.

In the fuel pipe, the fuel supply path 10 of the fuel distribution pipe 6 is connected to the fuel inflow pipe 14 connected to the fuel pump. Since the return hole Rc is connected to the return fuel pipe 15 connected to the fuel tank, the connection workability of the fuel pipe can be improved.
Further, since both the fuel inflow pipe and the return fuel pipe 15 are connected at one end (left side in FIG. 6) of the fuel distribution pipe 6, it is preferable for improving the connection workability.
Further, since the connecting pipe 9 for connecting the first fuel pipe 7 and the second fuel pipe 8 is fixed to the fuel distribution pipe 6 in advance, this is also preferable for improving the connection workability of the fuel pipe.
Further, the fixing member is formed in a U shape by the bottom portion 11a, the pair of side portions 11b and 11c, and the first press bending portion 11d and the second pressing bending portion 11e formed at the upper ends of the respective side portions. The first and second fuel pipes 7 and 8 can be pressed and arranged toward the first and second fuel injection valves J1 and J2 with a very simple structure, and a single throttle body can be formed by a single attachment process using the screw member 13. 1 can be fixed.

Next, another embodiment will be described with reference to FIG.
In this embodiment, two single throttle bodies 1 to which the first and second fuel injection valves J1 and J2 are attached are arranged on the side.
Reference numeral 1a denotes a first throttle body arranged on the left side in FIG. 8, which has the same structure as the single throttle body including the first and second fuel injection valves J1 and J2 shown in FIG. The description is omitted using.
Reference numeral 1b denotes a second throttle body arranged on the right side in FIG. 8, which has the same structure as the first throttle body.
The first and second throttle bodies are arranged such that the longitudinal axis WW of the intake passage 2 is parallel to the side.
According to the above, the first fuel injection valve J1 of the first throttle body 1a and the first fuel injection valve J1 of the second throttle body 1b are lines Y- perpendicular to the longitudinal axis WW and WW. Arranged at the same position in the Y direction.
Further, the second fuel injection valve J2 of the first throttle body 1a and the second fuel injection valve J2 of the second throttle body 1b are in the YY direction perpendicular to the longitudinal axis WW and WW. In the same position.
The fuel distribution pipe 20 is formed by a first fuel pipe 21, a second fuel pipe 22, and a communication pipe 23, and a pressure regulator R is connected to the opening at one end of the first fuel pipe 21, 2 A fuel supply path 24 is connected to an opening at one end of the fuel pipe 22.
The first fuel pipe 21 is attached to the first fuel inlet hole 21a into which the fuel inlet Jb of the first fuel injection valve J1 attached to the first throttle body 1a is inserted, and to the second throttle body 1b. The first fuel inlet hole 21a ′ into which the fuel inlet portion Jb of the first fuel injection valve J1 is inserted is formed laterally apart.
The second fuel pipe 22 is attached to the second fuel inlet hole 22a into which the fuel inlet Jb of the second fuel injection valve J2 attached to the first throttle body 1a is inserted, and attached to the second throttle body 1b. A second fuel inlet hole 22a 'into which the fuel inlet portion Jb of the second fuel injection valve J2 is inserted is formed laterally apart.
Two connecting pipes 23 are arranged, and the first connecting pipe 23a connects both pipes 21, 22 in the vicinity of the closed other ends of the first and second fuel pipes 21, 22. The two connecting pipes 23b connect the first and second fuel pipes 21 and 22 between the adjacent first fuel inlet holes 21a and the first fuel inlet holes 21a '.
Two fixing members 11 of the first embodiment are used.

According to this embodiment, the longitudinal axis W-W of each intake passage 2, 2 is respectively provided in the first injection guide holes 5a, 5a of the first and second throttle bodies 1a, 1b. The fuel injection portions Ja and Ja of the first fuel injection valve J1 are inserted and arranged, and the fuel injection portions Ja and Ja of the second fuel injection valve J2 are inserted and arranged in the second injection guide holes 5b and 5b, respectively.
According to the above, the first fuel injection valve J1 of the first throttle body 1a and the first fuel injection valve J1 of the second throttle body 1b are lines YY perpendicular to the longitudinal axis directions WW and WW. The second fuel injection valve J2 of the first throttle body 1a and the second fuel injection valve J2 of the second throttle body 1b are orthogonal to the longitudinal axial directions WW and WW. Arranged at the same position in the line Y-Y direction.
Next, the fuel inlet portion 7b of the first fuel injection valve J1 attached to the first throttle body 1a is inserted into each of the first fuel inlet holes 21a and 21a 'formed in the first fuel pipe 21 of the fuel distribution pipe 20. The second fuel inlet hole formed in the second fuel pipe 22 of the fuel distribution pipe 20 is inserted and arranged, and the fuel inlet portion Jb of the first fuel injection valve J mounted on the second throttle body 1b is inserted and arranged. The fuel inlet portion 7b of the second fuel injection valve J2 attached to the first throttle body 1a is inserted and disposed in 22a, 22a ', and the fuel inlet of the second fuel injection valve J attached to the second throttle body 1b. The part Jb is inserted and arranged.
Thus, the fuel inlet portions of all the fuel injection valves can be inserted and arranged in all the fuel inlet holes of the fuel distribution pipe.
Next, two fixing members 11 are prepared, and the fixing member 11a is fixed to the left on the mounting boss of the first throttle body 1a by the screw member 13, whereby the first pressing bent portion 11d is connected to the first fuel pipe. 21 is pressed and fixed, and the second pressing bent portion 11 e presses and fixes the second fuel pipe 22. On the other hand, the right fixing member 11b is fixed to the mounting boss of the second throttle body 1b by the screw member 13, whereby the first pressing bent portion 11d presses and fixes the first fuel pipe 21 and the second pressing bending. The portion 11e presses and fixes the second fuel pipe 22, whereby the fuel distribution pipe 20 can be firmly fixed to each throttle body.
Accordingly, all the fuel injection valves are nipped and fixed by the fuel distribution pipe 22 and the throttle body 1.
According to the above, even when a plurality of throttle bodies are arranged in parallel to the sides and the first and second fuel injection valves are arranged on each throttle body, the fuel injection valves are inserted into the throttle bodies. The first step, the second step of inserting the fuel distribution pipe toward the fuel inlet of the fuel injection valve, and the third step of fixing the fuel distribution pipe to the throttle body with the fixing member can complete the mounting. In addition, even in a case where a plurality of throttle bodies are arranged on the side, the assembly can be easily performed.
According to the fact that the first fuel pipe 21 and the second fuel pipe 22 are connected by the first communication pipe 23a and the second communication pipe 23b, the fuel supply from the second fuel pipe 22 to the first fuel pipe 21 is performed. In particular, the responsiveness of fuel supply when the fuel distribution pipe 20 is empty can be improved.
Further, according to the fact that the first and second fuel pipes 21 and 22 are connected through the plurality of connecting pipes 23a and 23b, the vapor staying in the first fuel pipe 23 can be made finer and the vapor can be reduced via the pressure regulator R. It is preferable to eliminate.
Further, the connection of the fuel inflow pipe 14 to the fuel supply path 24 and the flow path connection of the return fuel pipe 15 to the return hole Rc can be easily performed as in the case of using a single throttle body. Can be easily performed.
Although two throttle bodies are arranged in this embodiment, the number is not limited.

The principal part longitudinal cross-sectional view which shows one Example of the attachment structure of the fuel injection valve of this invention. (Equivalent to a longitudinal sectional view taken along line CC in FIG. 6) The upper top view of the fuel distribution pipe used for FIG. The longitudinal cross-sectional view in the AA line of FIG. FIG. 2 is a top plan view of a fixing member used in FIG. 1. The longitudinal cross-sectional view in the BB line of FIG. FIG. 2 is a top plan view of FIG. 1. The principal part longitudinal cross-sectional view in the DD line | wire of FIG. The upper top view which shows the other Example of the attachment structure of the fuel injection valve of this invention.

Explanation of symbols

1, 1a, 1b Throttle body 2 Intake passage 2a Intake passage 2b downstream of the throttle valve Intake passage 4 upstream of the throttle valve 4 Throttle valves 6, 20 Fuel distribution pipes 7, 21 First fuel pipe 7a Fuel inlet portion 8, 22 Second fuel pipe 8a Fuel inlet hole 9, 23 Connecting pipe 11 Fixing member 11a Bottom part 11d First press bending part 11e Second press bending part 24 Fuel supply path J1 First fuel injection valve J2 Second fuel injection valve R Pressure regulator

Claims (2)

A single throttle body (1) in which an intake passage (2) is drilled through and the intake passage (2) is opened and closed by a throttle valve (4);
A first fuel injection valve (J1) in which a fuel injection portion (Ja) is opened and disposed in an intake passage (2a) downstream of the throttle valve (4), and an intake passage (upstream of the throttle valve (4)) ( 2b) is provided with a second fuel injection valve (J2) in which a fuel injection portion (Ja) is opened, and the longitudinal axis of the first and second fuel injection valves (J1), (J2) ( X1-X1) and (X2-X2) are arranged from the same direction toward the intake passage 2,
On the other hand, the fuel distribution pipe (6) includes a fuel inlet hole (7a) inserted into and connected to the fuel inlet portion (Jb) of the first fuel injection valve (J1), and a pressure regulator (R) at one end opening. A first fuel pipe (7) and a fuel inlet hole (8a) inserted and connected to the fuel inlet (Jb) of the second fuel injection valve (J2) are provided, and a fuel supply passage (10) is provided at one end opening. a second fuel pipe (8), are disposed in parallel to each other, are formed integrally is further flow path connected with communication pipe (9) the first fuel pipe (7) and the second fuel pipe (8),
Further, the fixing member is formed upward from both ends of the bottom portion (11a), and is formed in a U-shape with the upper end opened, and the upper end of the first fuel pipe (7) is covered with one upper end. A first press bending portion (11d) is formed, and the other upper end is formed with a second press bending portion (11e) covering the upper portion of the second fuel pipe (8), and the bottom portion (11a) is provided with an attachment hole (11f). ) And the fixing member (11) is screwed to the single throttle body (1) through the mounting hole (11f) formed in the bottom (11a) of the fixing member (11). the first fuel injection valve (J1) and holding the first fuel pipe (7) by a single throttle body (1), the second fuel injection valve (J2) a second fuel pipe (8) single preparative of the throttle body (1) and the fuel injection valve, characterized in that the holding by Only structure. The first throttle body (1a) and the second throttle body (1b) having the first fuel injection valve and the second fuel injection valve (J2 ) are respectively connected to the longitudinal axes of the intake passages (2) and (2). A plurality of core wires (W-W) are arranged on the side with parallel,
Further, the first fuel pipe (21) of the fuel distribution pipe is connected to the fuel inlet portions (Jb) and (Jb) of the plurality of first fuel injection valves (J1) and (J1) adjacent to the side. Each of the fuels of the plurality of second fuel injection valves (J2), (J2) provided with fuel inlet holes (21a), (21a ') to be inserted and connected and laterally adjacent to the second fuel pipe (22). Fuel inlet holes (22a) and (22a ') inserted and connected to the inlet portions (Jb) and (Jb),
Further, the first fuel pipe (21) and the second fuel pipe (22) are connected to each other through a plurality of connecting pipes (23a) and (23b),
Two fixing members are prepared,
By screwing one fixing member (11) to the first throttle body (1a) through an attachment hole (11f) drilled in the bottom (11a) of one fixing member (11),
The first fuel injection valve (J1) is sandwiched between the first fuel pipe (21) and the first throttle body (1a), and the second fuel injection valve (J2) is connected to the second fuel pipe (22) and the first throttle body. (1a) and the other fixing member (11) to the second throttle body (1b) via an attachment hole (11f) drilled in the bottom (11a) of the other fixing member (11). By screwing, the first fuel injection valve (J1) is sandwiched between the first fuel pipe (21) and the second throttle body (1b) and the second fuel injection valve (J2) is connected to the second fuel pipe ( The fuel injection valve mounting structure according to claim 1, wherein the fuel injection valve is sandwiched between the second throttle body (22) and the second throttle body (1b) .

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