JP2000097131A - Setting structure of fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a setting structure of fuel injection valve made in the installing structure suitable for a funnel part, without providing the second fuel injection valve to the intake pipe itself of an engine, in an engine furnished with two fuel injection valves including the first and the second valves to one cylinder. SOLUTION: In a setting structure of fuel injection valve of an engine, the first fuel injection valve 4 is provided by facing to an air intake passage 2 at the downstream side of a throttle valve 3, a funnel 6 is provided at the upstream side end of the air intake passage 2, and the second fuel injection valve 11 is provided by facing to the air intake passage 2. In such a setting structure of fuel injection valve, the second fuel injection valve 11 is provided at the opening side end of the funnel 6, and the nozzle hole of the second fuel injection valve 11 is provided at the position inserting to the inner part side from the opening surface of the funnel 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection valve for an engine, and more particularly to an arrangement of fuel injection valves for an engine having two fuel injection valves for each cylinder.

[0002]

2. Description of the Related Art In a fuel injection engine, a fuel injection valve is usually provided facing an intake passage downstream of a throttle valve of each cylinder. A trumpet-shaped funnel is attached to the end of the intake passage to take in outside air. This funnel is usually arranged in the intake box that constitutes the air cleaner,
Outside air cleaned through the air cleaner element is sucked into the intake passage through the funnel. In general, the longer the length of such a funnel, the better the torque performance in a low rotation range, and the shorter the funnel, the better the torque performance in a high rotation range.

In such a fuel injection type engine,
In order to improve output, an engine has been developed in which a fuel injection valve downstream of a throttle valve is used as a first fuel injection valve and a second fuel injection valve is provided on an intake passage of each cylinder.

[0004]

However, when the second fuel injection valve is provided on the intake pipe constituting the intake passage, the injection port must be opened in the intake pipe of the cast product, and the configuration of the intake pipe itself is reduced. It becomes complicated and a new casting process is required, and a fuel injection valve and a fuel pipe must be provided in a narrow space around the engine, which greatly restricts space. .

In view of this, a configuration is conceivable in which a second fuel injection valve is provided in a funnel at the end of the intake passage.
When the fuel injection valve is provided on the funnel opening surface, there is a problem of intake resistance due to irregularities and steps of the external shape of the fuel injection valve.
In addition, when the funnel is disposed in the air cleaner, there is a problem of leak and maintenance due to penetration of the fuel pipe. For this reason, an engine in which a fuel injection valve is attached to a funnel in an air cleaner has not yet been developed and put to practical use.

The present invention has been made in view of the above points. In an engine provided with first and second two fuel injection valves for one cylinder, a second pipe is provided in an intake pipe itself of the engine.
An object of the present invention is to provide an arrangement structure of a fuel injection valve having no fuel injection valve and having a mounting structure suitable for a funnel portion.

[0007]

In order to achieve the above object, according to the present invention, a first fuel injection valve is provided corresponding to each cylinder of an engine to face an intake passage downstream of a throttle valve. A funnel is provided at the upstream end of the passage,
In the arrangement of a fuel injection valve of an engine provided with a second fuel injection valve facing the intake passage, the second fuel injection valve is provided at an open end of the funnel, and the injection port of the second fuel injection valve is provided. The fuel injection valve is disposed at a position inserted into the inside of the funnel from the opening surface of the funnel.

According to this structure, the second fuel injection valve is provided at the funnel opening at the end of the intake passage, so that the second fuel injection valve can be provided without changing the casting structure of the intake pipe itself. Further, since the injection port of the second fuel injection valve is arranged at a position inserted into the funnel, the injected fuel is reliably sucked into the intake passage, and in a narrow space around the engine below the fuel tank. The second fuel injection valve can be provided corresponding to the length of the funnel according to the torque performance.

In a preferred configuration example, the funnel is provided in an intake box.

[0010] According to this configuration, the second fuel injection valve is mounted facing the funnel provided in the intake box such as an air cleaner, so that the space can be effectively used.

In a further preferred configuration example, a smooth outer surface-shaped cover for covering a peripheral side surface of the second fuel injection valve is provided.

[0012] According to this configuration, since the unevenness and the step shape of the outer shape of the fuel injection valve are covered with the smooth outer surface cover, the output can be improved without increasing the intake resistance at the funnel entrance.

[0013]

FIG. 1 is a configuration diagram showing a main part of a fuel injection valve arrangement structure according to an embodiment of the present invention. The engine 1 is, for example, a four-cylinder engine (only one cylinder is shown), and is provided with a throttle valve 3 in an intake passage 2 for each cylinder, and is provided in an intake passage 2 downstream of a throttle body portion provided with the throttle valve 3. The first fuel injection valve 4 is provided to face. An air cleaner 5 is provided at an upstream end of the intake passage 2. Inside the air cleaner 5, a funnel 6 connected to the end of the intake passage 2 is provided.

The air cleaner 5 is composed of an upper case 5a and a lower case 5b, takes in outside air from a duct 7 provided in the upper case 5a, and supplies the air to the funnel 6 through an air cleaner element 8. A supercharging air intake 9 used for traveling particularly in high-power operation is provided on the front side of the lower case 5b. This air intake 9 is normally closed by a cap 10.

A second fuel injection valve 11 is provided at the enlarged open end of the funnel 6. This second fuel injection valve 11
Is disposed at a position where the injection port portion at the tip thereof is inserted inside the opening surface of the funnel 6 in a state of being covered by the cover 12 having a smooth curved surface. The cover 12 is shaped so as to cover the peripheral side surface along the outer shape of the fuel injection valve 11, the small-diameter injection port portion is inserted into the funnel opening surface, and the large-diameter upper portion protrudes outside the funnel opening surface. . More specifically, the smallest diameter portion on the tip side enters the basic diameter portion of the funnel, and the larger diameter portion than the small diameter portion is located so as to correspond to the enlarged diameter portion of the funnel.
In this way, by inserting only the small-diameter injection port portion of the fuel injection valve 11 into the funnel 6, the portion that blocks the funnel opening surface can be reduced, and the increase in intake resistance can be suppressed.

The cover 12 is supported by a support member (not shown) to which the cover 12 is attached and a support (not shown) made of a bolt or a collar through which the bolt is inserted from the lower case 5b side. The second fuel injection valves 11 of the respective cylinders are mounted on such a cover 12, and four of them are arranged side by side in the cylinder arrangement direction (the direction perpendicular to the drawing).

Below the air cleaner 5, a first fuel pipe 13 for supplying fuel to the first fuel injection valve 4 is provided along the direction in which the first fuel injection valves 4 of each cylinder are arranged (perpendicular to the drawing). Provided. Similarly, a second fuel pipe 14 for supplying fuel to the second fuel injection valve 11 is provided in the air cleaner 5.

A first or second fuel pipe 13 is connected to a fuel supply pipe 15 connected to a fuel pump (not shown) at an inlet end of the first fuel pipe 13, and a fuel return pipe 16b is connected to an outlet end of the first fuel pipe 13. Connected.

The second fuel pipe 14 has an inlet end connected to a feed pipe 15a branched or continuous from the fuel supply pipe 15, and an outlet end connected to a return pipe 16a. The return pipe 16a is connected to the first fuel pipe 13.

Outgoing pipe 15 connected to second fuel pipe 14
a is disposed inside the air cleaner 5 through a side wall of the lower case 5b via a grommet (not shown). The return pipe 16a of the second fuel pipe 14 is provided outside the air cleaner 5 through a lower wall of the lower case 5b via a grommet (not shown). Since the going pipe 15a and the returning pipe 16a penetrate the lower case 5b of the air cleaner 5 via the sealing member such as the grommet, the sealing performance of the penetrating portion is sufficiently ensured.

In the fuel pipe route having such a configuration,
The fuel sent from a fuel pump (not shown) through the fuel supply pipe 15 passes through the first fuel pipe 13 and the second fuel pipe 13 via the respective outgoing pipes 15b and 15a branched from the fuel supply pipe 15.
The fuel is supplied to the fuel pipe 14. Excess fuel supplied to the first fuel pipe 13 returns to a fuel tank (not shown) through a return pipe 16b. The surplus fuel supplied to the second fuel pipe 14 is supplied to the first fuel pipe 13 through the return pipe 16a, and then returns to the fuel tank through the return pipe 16b.

2 to 12 show more detailed embodiments of the present invention. In the respective drawings, the portions corresponding to the respective portions in FIG. 1 are denoted by the same reference numerals. FIG. 2 is a cross-sectional view of the air cleaner, FIG. 3 is a plan view thereof, and FIG. 4 is a cross-sectional view taken along a line AA in FIG.

The fuel supply pipe 15 connected to the fuel pump 18 (FIG. 2) branches into two outgoing pipes 15b and 15a for supplying fuel to the first and second fuel pipes 13 and 14, respectively.
Each is connected to each fuel pipe 13 and 14 via a joint 21 (FIG. 3). The outgoing pipe 15a connected to the second fuel pipe 14 passes through the lower case 5b of the air cleaner 5 via the grommet 17a. 1st fuel pipe 1
3, four first fuel injection valves 4 corresponding to the respective cylinders are mounted, and the outlet side ends thereof are connected to the return pipe 16b via the joint 21 (FIG. 3). T indicates the bottom surface of the fuel tank. An air cleaner or the like is provided in a narrow space below the fuel tank bottom surface T.

Four second fuel injection valves 11 corresponding to the respective cylinders are attached to the second fuel pipe 14, and the outlet end thereof is connected to a return pipe 16 a via a joint 21. This return pipe 16a penetrates through the lower case 5b of the air cleaner 5 via the grommet 17b and is connected to the first fuel pipe 13 as shown in FIG.

The second fuel injection valve 11 is mounted inside the cover 12 and is supported by a support member 22 (see FIGS. 10, 11, and 12 described later) formed integrally with the second fuel pipe 14.
The support member 22 is fixedly supported on a flange below the funnel by a column composed of four bolts 20 and a collar 28 through which the bolts 20 are inserted. Electric wiring 23 is connected to each fuel injection valve via a connector 29 (FIG. 3). The four funnels are individually fixedly supported on the throttle body 2c by bolts 20 '.

On each pipe constituting the fuel flow path, there are provided connectors 19a, 19b and 19c for connecting each pipe member. These connectors are configured to be snap-connected by pushing in a pipe. Each pipe has a rigid metal pipe (or rigid pipe) in order to keep its position fixed, in particular, to ensure the sealing performance of the penetrating portion to the air cleaner, and to reduce the pressure loss of the fuel sent from the pump. Resin material). Therefore, since the positions of the connecting members 19a and 19b are particularly close to each other, it is necessary to attach and remove the connecting members 19a, 19b together. It is desirable to keep them aligned.

FIG. 5 is a sectional view of the air cleaner alone, and FIG. 6 is a plan view thereof. The upper case 5a and the lower case 5b of the air cleaner 5 have a fitting type configuration in which the concave and convex portions of the mating surface along the peripheral edge are fitted and hermetically connected. A seal member 83 for hermetically inserting the upper end of the throttle body of the intake passage 2 (FIGS. 1 and 2) is attached to the lower case 5b. The air cleaner element 8 is arranged in a substantially U-shape as shown by hatching in FIG. 6, and is attached to the upper case 5a by screws 24.

FIG. 7 is a plan view of the intake passage (throttle body) and the fuel piping path of the first fuel injection valve, FIG. 8 is a side view thereof, and FIG. 9 is a sectional view taken along the line BB of FIG. An intake passage 2 is formed therein, and a throttle body 2c having a throttle valve 3 has a flange 2a integrally formed on the bottom thereof, and is attached to the engine side via the flange 2a. The fuel injection valve holding frame 2 is located at a position close to the flange 2 a and on the downstream side of the throttle valve 3.
b are integrally formed, and the first fuel injection valve 4
The injection port at the tip of is attached. Reference numeral 26 (FIG. 9) denotes a connector mounting portion for electric wiring of the fuel injection valve 4.

Four throttle bodies 2c are provided in parallel in the vehicle width direction corresponding to four cylinders (not shown) of the engine, and a first fuel pipe 13 is mounted along the throttle bodies 2c. This first fuel pipe 13
The first fuel injection valve 4 is located at the position of each throttle body 2c.
Is attached. In the middle of the first fuel pipe 13,
As described above, the return pipe 16 from the upper second fuel pipe
a is connected (FIG. 8).

FIG. 10 is a plan view of the second fuel pipe 14, FIG. 11 is a side view thereof, and FIG. 12 is a cross-sectional view taken along the line CC of FIG. The second fuel pipe 14 is integrally formed with the four arm-shaped support members 22. A bolt passing hole 20 a is formed at the tip of the support member 22. The second fuel pipe 14 has a bolt 20
(FIGS. 2 and 3), and is supported above the funnel 6 (FIG. 2) on the upper side of the throttle body via a collar 28 (FIGS. 2 and 3). The fuel pipe 14 is provided with the cover 1 at a predetermined interval corresponding to the position of each throttle body.
2 is attached by a screw 27, and the second fuel injection valve 11 is attached. The cover 12 has a smooth outer surface shape as described above, and as shown in FIG. 12, exposes the connector mounting portion 26 of the electric wiring and covers the second fuel injection valve 11.

The bolt 20 and the collar 28 are provided between funnels. The connector mounting portion 26, the fuel pipes 15a, 16a, and the like are disposed on the opposite side of the filter element 8 with the second fuel passage therebetween. This does not hinder the flow of intake air that passes through the filter element 8 and flows into each funnel.

[0032]

As described above, according to the present invention, the second
Since the fuel injection valve is provided at the funnel opening at the end of the intake passage, the second fuel injection valve can be provided without changing the casting structure of the intake pipe itself. Further, since the injection port of the second fuel injection valve is disposed at a position inserted into the funnel, the injected fuel is reliably sucked into the intake passage, and the torque performance is reduced in a narrow space around the engine. A second fuel injection valve can be provided corresponding to the length of the funnel.

In this case, if the funnel is provided in an intake box such as an air cleaner, the space can be effectively used. Further, if the second fuel injection valve is covered with a cover having a smooth outer shape, an increase in intake resistance can be suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a fuel injection valve arrangement structure according to an embodiment of the present invention.

FIG. 2 is a sectional configuration diagram of an air cleaner portion according to the structure of the present invention.

FIG. 3 is a plan view of the air cleaner of FIG. 2;

FIG. 4 is a sectional view taken along the line AA in FIG. 3;

FIG. 5 is a sectional view of the air cleaner having the structure of FIG. 2;

FIG. 6 is a plan view of the air cleaner of FIG. 5;

FIG. 7 is a plan view of a throttle body and a first fuel pipe portion having the structure of FIG. 2;

FIG. 8 is a side view of the structure of FIG. 7;

FIG. 9 is a sectional view taken along the line BB of FIG. 7;

FIG. 10 is a plan view of a second fuel pipe portion having the structure of FIG. 2;

FIG. 11 is a side view of the fuel pipe of FIG. 10;

FIG. 12 is a sectional view taken along the line CC of FIG. 11;

[Explanation of symbols]

1: engine, 2: intake passage, 3: throttle valve, 4:
First fuel injection valve, 5: air cleaner, 5a: upper case,
5b: lower case, 6: funnel, 7: duct, 8: air cleaner element, 9: air intake, 10: cap, 11: second fuel injection valve, 12: cover, 13: first fuel pipe, 14: first 2 fuel pipe, 15: fuel supply pipe, 15a, 15b: going pipe, 16a, 16b: return pipe, 17a, 17b: grommet, 18: fuel pump,
19: connector, 20: bolt, 21: joint, 2
2: support member, 23: electric wiring, 24, 25, 27: screw, 26: connector holding part, 28: collar, 29: connector.

Claims (3)

[Claims] A first fuel injection valve is provided corresponding to each cylinder of an engine to face an intake passage downstream of a throttle valve, and a funnel is provided at an upstream end of the intake passage. In the arrangement structure of the fuel injection valve of the engine provided with the second fuel injection valve, the second fuel injection valve is provided at the opening end of the funnel, and the injection port of the second fuel injection valve is An arrangement structure for a fuel injection valve, wherein the fuel injection valve is arranged at a position inserted inside the opening surface. 2. The arrangement of claim 1, wherein said funnel is provided in an intake box. 3. The fuel injection valve arrangement according to claim 1, further comprising a smooth outer cover that covers a peripheral side surface of the second fuel injection valve.