JPH11280594A - Fuel delivery pipe of fuel injection valve for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel delivery pipe capable of quickly discharging all the air bubbles stored within a fuel holding chamber. SOLUTION: In a fuel delivery pipe 10, a top part 13a which is the highest on a vertical direction upper side of the other parts is provided within a fuel holding chamber 13 and an air bubble guide surface 16a extending obliquely upward in the vertical direction toward the top part 13a is formed by a spacer 16 mounted on the upper part within the fuel holding chamber 13. As a result, all the air bubbles V within the fuel holding chamber 13 are supplied to a fuel injection valve 1D via a communicating path 15 and are discharged to the outside of the fuel holding chamber 13 after the air bubbles V are collected on the top surface 13a of the fuel holding chamber 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel delivery pipe for supplying fuel to a fuel injection valve of an internal combustion engine mounted on a vehicle, and more particularly, to a fuel delivery pipe such as air or fuel vapor accumulated inside the fuel delivery pipe. The present invention relates to a technique for improving a fuel delivery pipe so that air bubbles can be quickly discharged through a fuel injection valve.

[0002]

2. Description of the Related Art As shown in FIG.
Fuel injection valves (injectors) 1A, 1 for injecting fuel into an intake manifold (not shown) of a cylinder engine
B, 1C, and 1D have fuel delivery pipes 2 at their upper ends.
The fuel F held in the fuel holding chamber 3 in the fuel delivery pipe 2 is supplied to each cylinder.

At this time, when a return pipe and a pressure regulator of a fuel supply system for supplying the fuel to the fuel delivery pipe 2 are both provided on the fuel tank side, the fuel supply chamber 3 is provided in the fuel holding chamber 3 as shown in FIG. As shown by arrow A, fuel is supplied from the fuel tank in one way. As a result, air bubbles V such as air or fuel vapor accumulated in the fuel holding chamber 3 are sucked into the fuel injection valves 1A, 1B, 1C, 1D, injected into the intake manifold, and discharged outside the fuel holding chamber 3. There is a need to.

[0004]

When the amount of air bubbles V accumulated in the fuel holding chamber 3 is extremely large, the air bubbles V may be sucked into each of the fuel injection valves 1A, 1B, 1C, 1D. Although it is possible, it becomes difficult when the amount of bubbles V decreases. Therefore, the upper end 3 of the space in the fuel holding chamber 3
communication path 4 for communicating the fuel injection valve 1a with the fuel injection valve 1D at the right end in the figure.
Is penetrated into the end portion 5 of the fuel delivery pipe 2 so that the bubbles V accumulated in the fuel holding chamber 3 are sucked into the fuel injection valve 1D and discharged to the outside of the fuel holding chamber 3.

However, the bubbles V in the fuel holding chamber 3
Are dispersed along the upper inner wall surface 3b of the fuel holding chamber 3, so that when the amount of the bubbles V is further reduced, it becomes difficult to discharge the bubbles V through the communication passage 4 and the fuel injection valve 1D.

[0006] Then, the time required for completely discharging the bubbles V in the fuel holding chamber 3 becomes longer, so that the time spent for the receiving operation of the manufactured engine becomes longer, and it is difficult to start the engine of the vehicle produced in the line. It becomes.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved fuel delivery pipe which solves the above-mentioned problems of the prior art and can quickly discharge all the air bubbles accumulated in the fuel holding chamber. is there.

[0008]

In order to solve the above problems, a fuel delivery pipe according to the present invention is a fuel delivery pipe having a fuel holding chamber for holding fuel supplied to a fuel injection valve of an internal combustion engine. A top portion, which is provided in a part of the fuel holding chamber and is vertically higher than other portions, and extends obliquely upward toward the top portion, and guides bubbles in the fuel holding chamber to the top portion. And a communication passage for communicating the uppermost portion with the fuel injection valve.

The bubble guide surface may be formed by a spacer inserted into an upper portion of the fuel holding chamber, or may be formed by a wall surface forming the fuel holding chamber. Furthermore, the bubble guide surface can be formed by arranging the fuel delivery pipe at an angle. In addition, the bubble guide surface can be formed by a longitudinally extending inclined surface in which a plurality of fuel injection valves are arranged, and an inclined surface extending in a direction perpendicular to the longitudinal direction.

That is, according to the fuel delivery pipe of the fuel injection valve for an internal combustion engine of the present invention, the bubbles in the fuel holding chamber are collected at the highest uppermost portion vertically upward in the fuel holding chamber by the bubble guide surface. The air bubbles collected at the upper part can be sucked into the fuel injection valve through the communication passage, and can be injected into the intake manifold and discharged. Thus, according to the fuel delivery pipe of the present invention, all the air bubbles such as air and fuel vapor accumulated in the fuel holding chamber can be quickly discharged to the outside of the fuel holding chamber. Further, by inclining the bubble guide surface in a direction extending in the longitudinal direction and a direction perpendicular to the longitudinal direction, the bubbles in the fuel holding chamber can be collected at the uppermost portion in a concentrated state. Furthermore, by forming the bubble guide surface to be smooth, the movement of bubbles in the fuel in the fuel holding chamber can be promoted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to the present invention will be described.
This will be described in detail with reference to FIGS. Here, FIG.
1 is a longitudinal sectional view showing a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line CC shown in FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view showing a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to a second embodiment of the present invention, FIG. 4 is a sectional view taken along the line D-D shown in FIG. 3, and FIG. It is a longitudinal section showing the fuel delivery pipe of the fuel injector for internal combustion engines of the third embodiment. In the following description, the same parts may be denoted by the same reference numerals, and the description may be omitted.

First Embodiment As shown in FIGS. 1 and 2, a return pipe and a pressure regulator are both provided on a fuel tank side of a main body portion 12 of a fuel delivery pipe 10 of the first embodiment. A fuel supply pipe 12 extending from a fuel supply system (not shown) is connected.

The main body portion 11 is a cylindrical member having a substantially rectangular cross section formed by die-casting an aluminum alloy.
The internal space extending with the direction in which the fuel injection valves 1A, 1B, 1C, 1D are arranged as a longitudinal direction is a fuel holding chamber 13,
The fuel F supplied through the fuel supply pipe 12 is filled. Further, through holes are respectively formed in the lower surface 11a of the main body portion 11 at positions corresponding to the three fuel injection valves 1A, 1B, 1C on the left side in the figure, and fuel F in the fuel holding chamber 13 is injected. It supplies directly to the valves 1A, 1B, 1C.

On the other hand, at the right end 14 of the main body 11 in the figure, the uppermost part 13a, which is the highest part vertically upward in the fuel holding chamber 13, and the fuel injection valve 1D at the right end in the figure. A communication passage 15 for communication is provided therethrough, and fuel F is supplied to the fuel injection valve 1D via the communication passage 15.

A spacer 16 formed of an oil-resistant rubber material or resin material is provided on the upper part of the fuel holding chamber 13 on the upper inner wall face 13b and the left and right inner wall faces 13c, 13d of the fuel holding chamber 13. It is attached so that it adheres. As shown in FIGS. 1 and 2, a pair of left and right symmetrical air guide surfaces 16a and 16b are formed on the lower surface of the spacer 16 facing the fuel holding chamber 13. As shown in FIG. 1, both of the air bubble guide surfaces 16a and 16b are inclined toward the uppermost portion 13a of the fuel holding chamber 13 in such a manner as to rise upward in the vertical direction toward the front end in the longitudinal direction, that is, to the right side in the drawing. doing. As shown in FIG. 2, both of the bubble guide surfaces 16a and 16b are inclined so as to rise upward in the vertical direction toward the center in the width direction of the fuel holding chamber 13, that is, toward the center in the left-right direction on the drawing. I have. Further, the bubble guide surfaces 16a and 16b are both finished smoothly so as not to hinder the movement of the bubble V toward the uppermost portion 13a.

As a result, a component force in the direction in which the bubble guide surfaces 16a and 16b of buoyancy generated in the fuel F itself extend on the bubbles V accumulated in the fuel holding chamber 13.
Accordingly, the bubble V gradually moves in the longitudinal direction toward the uppermost portion 13a of the fuel holding chamber 13 as shown by the arrow B in FIG. The bubbles V collected in a state of being concentrated on the uppermost portion 13a in the fuel holding chamber 13 are sucked from the upper opening 15a of the communication path 15 and supplied to the fuel injection valve 1D via the communication path 15. The fuel is injected into the intake manifold by the fuel injection valve 1 </ b> D and discharged outside the fuel holding chamber 13.

That is, in the fuel delivery pipe 10 of the first embodiment, the bubbles V in the fuel holding chamber 13 are separated by the bubble guide surfaces 16a and 16b.
a, and the collected bubbles V are supplied to the fuel injection valve 1D through the communication passage 15, injected into the intake manifold, and discharged to the outside of the fuel holding chamber 13. As a result, all the bubbles V in the fuel holding chamber 13
Can be quickly discharged regardless of the size thereof, so that not only can the manufactured engine be efficiently operated for receiving operation, but also the engine of a line-produced vehicle can be easily started. Further, the fuel delivery pipe 10 of the first embodiment has a bubble guide surface 16 by mounting a spacer 16 on the upper part in the fuel holding chamber 13.
Since the a and 16b are formed, not only the die casting of the main body portion 11 can be easily performed, but also the bubble guide surface can be easily provided in the existing fuel delivery pipe. Further, by smoothing the bubble guide surfaces 16a, 16b of the spacer 16, friction or catch between the bubble guide surfaces 16a, 16b and the bubbles V is reduced, and the bubbles V in the fuel holding chamber 13 are more effectively reduced. At the top 13a.

Second Embodiment Next, a fuel delivery pipe according to a second embodiment will be described with reference to FIGS. The fuel delivery pipe 10 according to the above-described first embodiment has a bubble guide surface 16 by mounting a spacer 16 on the upper part in the fuel holding chamber 13.
a, 16b. On the other hand, in the fuel delivery pipe of the second embodiment, the bubble guide surface is directly formed by the wall surface forming the fuel holding chamber.

That is, the second embodiment shown in FIGS.
The main body portion 21 of the fuel delivery pipe 20 of the embodiment includes:
A cylindrical member that is die-cast from aluminum alloy.
As shown in FIG. 1, the pair of left and right upper walls 22 and 23 shown in FIG. It is formed so as to be inclined. As shown in FIG. 4, the left and right pair of upper walls 22 and 23 are formed in the shape of a mountain so as to rise upward in the vertical direction toward the center in the width direction of the fuel holding chamber 24, that is, toward the center in the left and right direction on the drawing. It is formed inclined. Thus, the lower surfaces of the pair of left and right upper walls 22 and 23 facing the fuel holding chamber 24 have bubble guide surfaces 22a and 23, respectively.
a.

A component of buoyancy generated in the fuel F in the direction in which the bubble guide surfaces 22a and 23a extend is applied to the bubbles V accumulated in the fuel F in the fuel holding chamber 24. Accordingly, the bubble V gradually moves in the longitudinal direction toward the uppermost portion 24a of the fuel holding chamber 24, as shown by an arrow B in FIG. The air bubbles V collected in a state concentrated on the uppermost portion 24a of the fuel holding chamber 24 are separated from the upper opening 2 of the communication passage 26 formed through the right end 25 of the main body 21 in the drawing.
6A, and is injected into the fuel injection valve 1D through the communication passage 26.
Is injected into the intake manifold by the fuel injection valve 1D and discharged to the outside of the fuel holding chamber 24.

That is, the fuel delivery pipe 20 of the second embodiment has upper walls 22 and 2 forming a fuel holding chamber 24.
Since the air bubble guide surfaces 22a and 23a are directly formed by 3, not only can the structure be simplified, but also the manufacturing cost and weight can be reduced. Further, since all the air bubbles V in the fuel holding chamber 24 can be quickly discharged, not only can the manufactured engine perform the receiving operation efficiently, but also,
The engine of the vehicle produced in the line can be easily started. Further, the bubble guide surfaces 22a and 23a formed by the upper walls 22 and 23 are coated with a low-friction resin material such as Teflon, for example, to reduce friction or catch between the bubble guide surfaces 22a and 23b and the bubble V. As a result, the bubbles V in the fuel holding chamber 24 can be more effectively collected at the uppermost portion 24a.

Third Embodiment Next, a fuel delivery pipe 30 according to a third embodiment will be described with reference to FIG. In the fuel delivery pipe 10 of the first embodiment described above, the bubble guide surfaces 16a and 16b are formed using the spacer 16. Further, the fuel delivery pipe 20 of the second embodiment described above has a bubble guide surface 22 by changing the shape of the main body portion 21 thereof.
a, 23a. On the other hand, the fuel delivery pipe of the third embodiment forms an air bubble guide surface in the fuel holding chamber by using the existing fuel delivery pipe as it is.

That is, the fuel delivery pipe 30 of the third embodiment shown in FIG.
The present invention utilizes the existing fuel delivery pipe body having a constant rectangular cross section. However, the main body portion 31 is raised by a bracket (not shown) such that the direction in which the fuel injection valves 1A, 1B, 1C, and 1D are lined up is ascends vertically toward the front end side, in other words, toward the right side as viewed in the drawing. It is attached to an engine cylinder head (not shown) in an inclined state. Thereby, the highest uppermost portion 33a can be formed in the fuel holding chamber 33 vertically higher than other portions, and the main body portion 31 can be formed.
The lower surface of the upper wall 34 facing the fuel holding chamber 33 is the bubble guide surface 3.
4a.

Further, the main body portion 31 and each fuel injection valve 1A,
1B, 1C and 1D are connected by connection pipes 32A, 32B, 32C and 32D attached to the lower end of the main body portion 31, respectively. Thereby, the fuel holding chamber 3
3 can be supplied to the fuel injection valves 1A, 1B, 1C, 1D.

The bubbles V accumulated in the fuel holding chamber 33
, A component force in the direction in which the bubble guide surface 34a of buoyancy generated in the fuel F itself extends. As a result, the bubble V is generated in the fuel holding chamber 3 as shown by the arrow B in FIG.
3 gradually moves in the longitudinal direction toward the uppermost portion 33a. The air bubbles V collected at the uppermost portion 33a of the fuel holding chamber 33 are sucked from the upper opening 36a of the communication passage 36 penetrating the right end 35 of the main body portion 31 in the drawing, and are also passed through the communication passage 36. After being supplied to the fuel injection valve 1D, the fuel is injected into the intake manifold by the fuel injection valve 1D and discharged to the outside of the fuel holding chamber 33.

That is, since the fuel delivery pipe 30 of the third embodiment utilizes the body of the existing fuel delivery pipe as it is, the manufacturing cost can be greatly reduced. In addition, since all the air and fuel vapor in the fuel holding chamber 33 can be quickly discharged, not only can the manufactured engine be efficiently operated for receipt, but also the engine of the line-produced vehicle can be used. Can be started easily.

Although the embodiments of the fuel delivery pipe of the fuel injection valve for an internal combustion engine according to the present invention have been described in detail, the present invention is not limited to the above-described embodiments, and various modifications are possible. Needless to say, there is. For example, in the first embodiment described above, the air bubbles V are collected near the center in the width direction of the fuel holding chamber 13 by the pair of left and right air bubble guide surfaces 16a and 16b.
It is also possible to adopt a structure in which one bubble guide surface is provided and bubbles V are collected on either one of the left and right inner wall surfaces 13c and 13d of the fuel holding chamber 13. In this case, it goes without saying that the upper opening 15a of the communication path 15 is arranged on the side where the bubbles V are collected.

[0028]

As is apparent from the above description, the fuel delivery pipe of the fuel injection valve for an internal combustion engine according to the present invention allows bubbles accumulated in the fuel holding chamber to move vertically upward in the fuel holding chamber by the bubble guide surface. In addition to collecting air bubbles at the highest top, the air bubbles collected at the top are sucked into the fuel injection valve through the communication passage, injected into the intake manifold, and discharged to the outside of the fuel holding chamber. As a result, according to the fuel delivery pipe of the present invention, all the air bubbles such as air and fuel vapor accumulated in the fuel holding chamber can be quickly discharged to the outside of the fuel holding chamber. Not only can the time required for operation be shortened to reduce man-hours, but also the engine of the line-produced vehicle can be started quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line CC shown in FIG. 1;

FIG. 3 is a longitudinal sectional view showing a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along the line D-D shown in FIG. 3;

FIG. 5 is a longitudinal sectional view showing a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a conventional fuel delivery pipe.

[Explanation of symbols]

 F Fuel V Bubbles 1A, 1B, 1C, 1D Fuel injection valve 2 Fuel delivery pipe 3 Fuel holding chamber 4 Communication passage 5 End 10 Fuel delivery pipe of the first embodiment 11 Main part 12 Fuel supply pipe 13 Fuel holding chamber 13a Upper part 14 End part 15 Communication path 16 Spacer 16a, 16b Bubble guide surface 20 Fuel delivery pipe 21 of the second embodiment 21 Main body part 22 Upper wall 22a Bubble guide surface 23 Upper wall 23a Bubble guide surface 24 Fuel holding chamber 24a Top 25 end Part 26 Communication passage 30 Fuel delivery pipe of the third embodiment 31 Main body part 31a Bubble guide surface 32A, 32B, 32C, 32D Connection pipe 33 Fuel holding chamber 33a Top 34 Upper wall 34a Bubble guide surface 35 End 36 Communication passage

Claims (7)

[Claims] 1. A fuel delivery pipe provided with a fuel holding chamber for holding fuel supplied to a fuel injection valve of an internal combustion engine, wherein the fuel delivery pipe is provided in a part of a space forming the fuel holding chamber, An uppermost portion, which is also vertically highest, an obliquely upward direction toward the uppermost portion, a bubble guide surface for guiding bubbles in the fuel holding chamber to the uppermost portion, and the uppermost portion and the fuel injection valve. A fuel delivery pipe for a fuel injection valve for an internal combustion engine, comprising: 2. A fuel delivery pipe for an internal combustion engine fuel injection valve according to claim 1, wherein said bubble guide surface is formed by a spacer inserted into an upper portion of said fuel holding chamber. 3. A fuel delivery pipe for a fuel injection valve for an internal combustion engine according to claim 2, wherein said bubble guide surface is formed smoothly. 4. A fuel delivery pipe for a fuel injection valve for an internal combustion engine according to claim 1, wherein said bubble guide surface is formed by a wall surface forming said fuel holding chamber. 5. A fuel delivery pipe for an internal combustion engine fuel injection valve according to claim 4, wherein said air bubble guide surface is smoothly coated with a low friction material. 6. A fuel delivery pipe for an internal combustion engine fuel injection valve according to claim 1, wherein said bubble guide surface is formed by arranging said fuel delivery pipe at an angle. 7. The air bubble guide surface according to claim 1, wherein the air bubble guide surface is inclined in a longitudinal direction in which the plurality of fuel injection valves are arranged and in a direction perpendicular to the longitudinal direction. A fuel delivery pipe for a fuel injection valve for an internal combustion engine as described in the above.