JPH11230003A - Fuel delivery pipe of fuel injection valve for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the supply of air to a fuel injection valve without increasing its dimension. SOLUTION: A fuel delivery pipe 10 comprises a horizontally extending pipe main body 11 for housing fuel F therein and a tubular member 14 liquid tightly inserted into a through hole 13 provided on the side surface of the pipe main body 11. The end part 16 of the tubular member 14 is extended into the pipe main body 11 to form a fuel holding part 17 for holding fuel above the fuel inlet part 2a of a fuel infection valve 2. Namely, since the fuel holding part 17 is provided in the pipe main body 11, the vertical dimension of all the fule delivery pipe 10 is not increased. Further, the fuel in the fuel holding part 17 is supplied to the fuel injection valve 2, so that the accidental fire of an internal combustion engine is not generated so as to prevent the travel failure of a vehicle.

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 in a state where air is trapped inside the fuel delivery pipe. TECHNICAL FIELD The present invention relates to a technique for preventing a situation in which air is supplied to a fuel injection valve to cause a misfire of an internal combustion engine and a vehicle to run poorly even when turning.

[0002]

2. Description of the Related Art As shown in FIG. 4, a fuel injection valve (injector) 2 for injecting fuel into an intake manifold 1 of an internal combustion engine mounted on a vehicle has an upper end 3 having a cylindrical shape of a fuel delivery pipe 4. The fuel F fitted in the portion 5 and stored in the fuel delivery pipe 4 is supplied. At this time, when the return pipe of the fuel supply system is not provided and the pressure regulator is provided on the fuel tank side, fuel is supplied to the fuel delivery pipe 4 from the fuel tank in one way. This allows
If the air A accumulates in the fuel delivery pipe 4, the air must be sucked into the fuel injection valve 2, injected into the intake manifold 1 together with the fuel, and discharged to the outside of the fuel delivery pipe 4.

[0003] On the other hand, when a vehicle is produced on a line in a factory, it does not take enough time to discharge the air A accumulated inside the fuel delivery pipe 4 to the outside. In some cases, the vehicle goes off line when the vehicle remains. In this case, when the vehicle that has turned off the line turns, the fuel F in the fuel delivery pipe 4 is biased to one side of the fuel delivery pipe 4 by centrifugal force.
The fuel injection valve 2 provided on the other side of the fuel delivery pipe 4 draws air A. Then, the cylinder in which the air is injected by the fuel injection valve 2 misfires.
The operation of the internal combustion engine is hindered, resulting in poor running of the vehicle.

In order to solve such a problem, in the fuel delivery pipe 6 described in Japanese Utility Model Laid-Open No. 1-74361 shown in FIG. 5, concave spaces 7 are formed at portions where the fuel injection valves 2 are connected. Have been. As a result, even if the air A is accumulated in the fuel delivery pipe 6, the fuel F accumulated in the concave space 7 is supplied to the fuel injection valve 2, so that even if the vehicle turns, the fuel injection valve 2 Does not draw in the air A, so that the operation of the internal combustion engine is not hindered and the vehicle does not run poorly.

[0005]

However, in the fuel delivery pipe 6 described in Japanese Utility Model Laid-Open No. 1-74361, a recessed space 7 is integrally formed at a lower portion of the pipe body, and the recessed space 7 is formed. Since the fuel injection valve 2 is connected to the fuel delivery pipe 6 including the fuel delivery pipe 6, the vertical dimension thereof is greatly increased. This makes it extremely difficult to apply the fuel delivery pipe 6 to an internal combustion engine of a vehicle having a narrow engine room. In addition, the production cost and weight of the fuel delivery pipe 6 increase.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuel delivery pipe which can solve the above-mentioned problems of the prior art and can prevent the supply of air to the fuel injection valve without increasing the size. .

[0007]

According to a first aspect of the present invention, a fuel delivery pipe is provided.
A fuel delivery pipe for supplying fuel to a fuel injection valve of an internal combustion engine, wherein the fuel delivery pipe is liquid-tightly inserted into a horizontally extending pipe main body that accommodates the fuel and a through hole formed through a side surface of the pipe main body. A cylindrical member. The tubular member has a fuel suction portion of the fuel injection valve fitted to a base end thereof, and a distal end thereof is extended inside the pipe main body and opened inside the pipe main body, A fuel holding part for holding fuel is formed above a fuel suction part of the fuel injection valve.

That is, in the fuel delivery pipe according to the first aspect of the present invention, the tubular member in which the fuel injection valve is fitted is extended into the inside of the pipe body to form the fuel holding portion. The overall vertical dimension does not increase. Then, even if the vehicle turns while the air is trapped inside the pipe body and the fuel is biased to one side of the pipe body due to centrifugal force, the fuel held by the fuel holding portion inside the tubular member is not removed. Since the fuel is supplied to the fuel injection valve, it is possible to reliably prevent the air from being supplied to the fuel injection valve, causing the internal combustion engine to misfire and the vehicle to have poor running.
Further, since the distal end of the tubular member protrudes inside the pipe body, the centrifugal force accompanying the turning movement of the vehicle hinders the movement of the fuel that tends to be biased to one side of the pipe body, and the other end of the pipe body. The part can be reliably prevented from being filled only with air.

In the fuel delivery pipe according to a second aspect of the present invention, a communication hole communicating with a lower end portion of a space inside the pipe main body is formed in a side wall of the tubular member. Accordingly, even when the liquid level of the fuel supplied to the inside of the pipe main body is low, the fuel can be supplied to the inside of the fuel holding section through the communication hole, so that the supply of the fuel to the inside of the pipe main body is started. Immediately after that, the internal combustion engine can be started. Further, when a plurality of tubular members are provided in the pipe body, the fuel supplied to the inside of the pipe body can be simultaneously supplied to the fuel holding chambers of all the tubular members. The fuel can be simultaneously injected from the valves, and the internal combustion engine can be started smoothly.

In the fuel delivery pipe according to a third aspect of the present invention, the communication hole extends in a direction perpendicular to an axis of the pipe body. Thereby, even if the fuel stored in the pipe main body is biased toward one end of the pipe main body due to the centrifugal force generated when the vehicle turns, the fuel in the fuel holding unit is inserted into the pipe main body through the communication hole. The amount flowing out can be minimized.

In the fuel delivery pipe according to a fourth aspect of the present invention, the communication hole stores at least an amount of fuel necessary for continuously operating the internal combustion engine in an idling state in the fuel holding portion. It has an inner diameter that can be supplied continuously. As a result, even when the liquid level of the fuel stored inside the pipe main body is lowered and the fuel does not flow into the fuel holding chamber from the opening at the end of the tubular member, the fuel supplied through the communication hole is At least the idling operation of the internal combustion engine can be continued, and the recovery of the fuel level inside the pipe body can be waited.

In the fuel delivery pipe according to a fifth aspect of the present invention, the uppermost portion of the fuel holding portion is the lowest liquid level among the liquid levels of the fuel stored in the pipe body. It is arranged below. Thereby, even when the liquid level of the fuel stored in the pipe main body is the lowest, the fuel can flow into the fuel holding portion from the opening at the tip end of the tubular member.

[0013] In the fuel delivery pipe according to a sixth aspect of the present invention, the cylindrical member has a notch at its tip end for discharging air in the fuel holding portion into a space inside the pipe body. Have. Accordingly, it is possible to reliably prevent air from adhering to the inner wall surface of the cylindrical member in a bubble-like manner and preventing the fuel from flowing into the fuel holding unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to the present invention will be described below in detail with reference to FIGS. Here, FIG. 1 is a cross-sectional view showing a state in which a fuel injection valve is attached to a fuel delivery pipe of a fuel injection valve for an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is a sectional view of the fuel delivery pipe shown in FIG. FIG. 3 is an enlarged sectional view of a main part of the fuel delivery pipe of the present invention shown in FIG.

As shown in FIGS. 1 to 3, a fuel delivery pipe 10 of the present embodiment includes a pipe body 11 for storing fuel F to be supplied to the fuel injection valve 2, and a pipe body 1.
1 for fixing the bracket 1 to an internal combustion engine (not shown)
And a through hole 13 penetrating through a side surface of the pipe body 11.
And a cylindrical member 14 inserted therein in a liquid-tight manner.

The pipe main body 11 is made of a thin metal pipe, and has a pressure generated at one end of a fuel supplied through a fuel supply pipe P as shown in FIG. A pulsation damper D that absorbs fluctuations is attached.

The bracket 12 is a member formed by pressing a thick metal plate. One end of the bracket 12 is welded in close contact with the side surface of the pipe body 11, and the other end is provided with a bolt hole. Is provided and is screwed and fixed to a cylinder head of an internal combustion engine (not shown).

The cylindrical member 14 is formed by cutting a thick pipe made of metal, and is fitted into a through hole 13 formed through the side surface of the pipe body 11 and then around the fitted portion. Are welded to the pipe main body 11. The base end 15 of the tubular member 14 extends obliquely downward toward the outside of the pipe main body 11, and the suction portion 2a of the fuel injection valve 2 is fitted therein in a liquid-tight manner. On the other hand, the distal end 16 of the tubular member 14 extends obliquely upward toward the inside of the pipe body 11. The tip portion 16 has a gutter shape having a substantially U-shaped cross section, and the inside thereof is a fuel holding portion 17 for holding fuel above the suction portion 2 a of the fuel injection valve 2. The uppermost portion 17a of the fuel holding portion 17 is disposed below the lowest liquid level among the liquid levels of the fuel F stored in the pipe body 11.

The cylindrical member 14 has a tip 16
A notch 18 is provided at the upper end of the notch. In addition, a communication hole 19 that communicates with the lower end of the space inside the pipe body 11 is provided through the tubular member 14. The inside diameter of the communication hole 19 is set to an inside diameter capable of supplying an amount of fuel required for idling the internal combustion engine into the fuel holding portion 17. Further, the communication hole 19 is provided in the pipe body 1.
1 is extended through the side wall of the cylindrical member 14 so as to extend in a direction perpendicular to the extending direction, that is, in a direction parallel to the paper surface of FIG. 1 or FIG.

Next, the operation of the fuel delivery pipe 10 of the present embodiment configured as described above will be described.

When a vehicle equipped with the fuel delivery pipe 10 according to the present embodiment is produced on a line in a factory, the fuel delivery pipe 10 is connected via a fuel pipe P and a pulsation damper D shown in FIG.
The fuel F is gradually supplied into the pipe main body 11. At this time, when the internal combustion engine is started, the air A remaining in the pipe main body 11 is sucked into the fuel injection valve 2, injected into the intake manifold 1, and discharged.

When the liquid level of the fuel F in the pipe body 11 gradually increases, the fuel F first enters the fuel holding portion 17 from the communication hole 19 formed through the tubular member 14. As a result, the fuel injection valve 2 enters a state in which the fuel F can be injected, so that the internal combustion engine can be started. At this time, since the communication hole 19 is provided at the lower end of the space inside the pipe main body 11, the fuel injection can be performed even immediately after the supply of the fuel F into the pipe main body 11 is started and the liquid level is significantly low. The fuel F can be supplied to the valve 2.

The fuel F accumulated inside the pipe body 11 is supplied to the fuel holding portions 17 inside the four cylindrical members 14 in total.
Are simultaneously supplied through the respective communication holes 19. As a result, fuel can be simultaneously injected from all four fuel injection valves 2 in total, so that the internal combustion engine can be started smoothly. On the other hand, in the fuel delivery pipe 6 described in Japanese Utility Model Laid-Open No. 1-74361, fuel is not supplied to the next concave space 7 unless the concave space 7 on the fuel supply upstream side is filled with fuel. Therefore, the internal combustion engine cannot be started smoothly until all the concave spaces 7 are filled with the fuel.

The inner diameter of the communication hole 19 is determined by the amount of fuel required for the idling operation of the internal combustion engine to be continued.
The size is set such that it can be continuously supplied into the fuel holding unit 17. Thus, even if the liquid level of the fuel F supplied to the inside of the pipe body 11 has not reached the liquid level flowing into the fuel holding portion 17 from the opening of the distal end portion 16 of the tubular member 14, the communication is established. The idling operation of the internal combustion engine can be continued by the fuel supplied through the hole 19, and the fuel F level can be waited for.

When the liquid level of the fuel F inside the pipe main body 11 rises, the fuel F flows into the fuel holding portion 17 from the opening of the distal end portion 16 of the tubular member 14, and fills the inside of the fuel holding portion 17 completely. Meet. Accordingly, even if the fuel F in the pipe body 11 is biased toward one end of the pipe body 11 due to the centrifugal force generated when the vehicle turns off the line, the fuel F is held in the fuel holding portion 17. Then, the fuel F can be continuously supplied to the fuel injection valve 2. Further, the communication hole 19 penetrating through the tubular member 14 is penetrated so as to extend in a direction perpendicular to the axis of the pipe main body 11, and the inside diameter thereof is set to a minimum necessary size. The amount of fuel flowing out of the fuel holding portion 17 into the pipe main body 11 can be minimized.

Therefore, even if the vehicle turns while the air A is accumulated inside the pipe body 11, the fuel F can be continuously supplied to the fuel injection valve 2. Can reliably prevent the internal combustion engine from misfiring due to the intake of air and the vehicle from running poorly. Further, since the distal end portion 16 of the tubular member 14 protrudes inside the pipe main body 11, the movement of the fuel F that tends to be biased toward one end of the pipe main body 11 due to the centrifugal force accompanying the turning of the vehicle is prevented, It is possible to reliably prevent the other end of the pipe body 11 from being filled with only air.

Further, since the notch 18 is provided at the upper end of the distal end portion 16 of the cylindrical member 14, air adheres to the inner wall surface of the distal end portion of the cylindrical member 14 in the form of bubbles, and the air enters the fuel holding portion 17. It is possible to reliably prevent the fuel supply from being hindered and the air from being sucked into the fuel injection valve 2. Further, the provision of the notch 18 allows the fuel F to be reliably supplied to all the four fuel holding portions 17 in total.

Although the embodiment of the fuel delivery pipe of the fuel injection valve for an internal combustion engine according to the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications are possible. Needless to say, there is. For example, in the above-described embodiment, the distal end portion 16 of the tubular member 14 is formed in a gutter shape having a U-shaped cross-section, but the cross-sectional shape may be a completely cylindrical shape. Further, in the above embodiment, the case where air remains in the fuel delivery pipe is described as an example.However, even when fuel vapor accumulates in the fuel delivery pipe, the fuel delivery pipe of the present invention is completely It goes without saying that it performs a similar function.

[0029]

As is apparent from the above description, according to the fuel delivery pipe of the fuel injection valve for an internal combustion engine of the present invention, the vertical dimension of the entire fuel delivery pipe does not increase. In addition, even if the vehicle turns while the air is trapped inside the pipe body, fuel can be supplied to the fuel injection valve, so that the fuel injection valve sucks air and the internal combustion engine misfires. It is possible to reliably prevent the occurrence of running failure. In addition, since the distal end of the tubular member protrudes inside the pipe main body, the movement of the fuel that tends to be biased toward one end of the pipe main body due to the centrifugal force accompanying the turning of the vehicle is prevented, and the other end of the pipe main body is prevented. It is possible to reliably prevent the end from being filled only with air. Further, since the fuel can be supplied into the fuel holding portion through the communication hole provided in the cylindrical member, even when the fuel level is low immediately after the supply of the fuel to the inside of the pipe body is started,
The internal combustion engine can be started. Since fuel can be simultaneously supplied to the fuel holding chambers of the plurality of tubular members through the respective communication holes, the internal combustion engine can be started more smoothly. Also, since the communication hole extends in a direction perpendicular to the axis of the pipe body,
It is possible to minimize the amount of the fuel in the fuel holding portion flowing out of the pipe main body through the communication hole. Further, since the idling of the internal combustion engine can be continued by the fuel supplied through the communication hole, the idling of the internal combustion engine can be continued even when the liquid level of the fuel is low, and it is necessary to wait for the liquid level to recover. it can. Also, since the uppermost portion of the fuel holding portion is disposed below the lowest liquid level of the fuel level stored in the pipe main body, the liquid level of the fuel stored inside the pipe main body is reduced. Even when the level is reduced to the minimum, it is possible to reliably supply the fuel holding unit with an amount of fuel necessary for operating the internal combustion engine.
In addition, the air accumulated in the fuel holding portion is discharged into the space inside the pipe main body through the notch, and the air adheres in a foam shape to the inner wall surface at the distal end portion of the tubular member, thereby supplying the fuel into the fuel holding portion. It is possible to reliably prevent obstruction or intake of air by the fuel injection valve.

[Brief description of the drawings]

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

FIG. 2 is an overall side view of the fuel delivery pipe shown in FIG.

FIG. 3 is an enlarged sectional view of a main part of the fuel delivery pipe of the present invention shown in FIG.

FIG. 4 is a sectional view showing a conventional fuel delivery pipe.

FIG. 5 is a fuel delivery pipe described in Japanese Utility Model Laid-Open No. 1-74361.

[Explanation of symbols]

 D Pulsation damper F Fuel A Air collected in fuel delivery pipe P Fuel supply pipe 1 Intake manifold 2 Injector 10 Fuel delivery pipe 11 Pipe body 13 Through hole 14 Cylindrical member 15 Base end 16 Tip 17 Fuel holding 18 Notch 19 Communication hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 55/00 F02M 55/00 A

Claims (6)

[Claims] 1. A fuel delivery pipe for supplying fuel to a fuel injection valve of an internal combustion engine, the pipe body containing the fuel and extending horizontally, and a liquid flowing through a through hole formed in a side surface of the pipe body. A cylindrical member that is densely inserted, and the cylindrical member has a base end portion fitted with a fuel suction portion of the fuel injection valve, and a distal end portion extending inside the pipe body. A fuel delivery pipe for a fuel injection valve for an internal combustion engine, characterized in that a fuel holding part that opens inside the pipe body and holds fuel above a fuel suction part of the fuel injection valve is formed. 2. A fuel injection valve for an internal combustion engine according to claim 1, wherein a communication hole communicating with a lower end portion of a space inside said pipe main body is formed in a side wall of said cylindrical member. Fuel delivery pipe. 3. The fuel delivery pipe for an internal combustion engine fuel injection valve according to claim 1, wherein the communication hole extends in a direction perpendicular to an axis of the pipe body. 4. The internal combustion engine according to claim 1, wherein the communication hole has an inner diameter capable of continuously supplying at least an amount of fuel necessary for continuously operating the internal combustion engine into the fuel holding portion. Item 4. A fuel delivery pipe for an internal combustion engine fuel injection valve according to any one of Items 1 to 3. 5. The fuel holding section according to claim 1, wherein an uppermost portion of the fuel holding section is disposed below a lowest liquid level among the liquid levels of the fuel stored in the pipe body. Item 5. A fuel delivery pipe for an internal combustion engine fuel injection valve according to any one of Items 1 to 4. 6. The pipe member according to claim 1, wherein the cylindrical member has a notch at a distal end thereof for discharging air in the fuel holding portion into a space inside the pipe main body. A fuel delivery pipe for the fuel injection valve for an internal combustion engine according to the above.