JPH08193558A - Fuel supply system in internal combustion engine - Google Patents

Abstract

PURPOSE: To disperse air staying in a fuel distributing pipe into refined bubbles, and to discharge them into an intake pipe without having any effect on the fuel injection quantity of a fuel injection valve. CONSTITUTION: A fuel inflow pass ranging to a fuel pump and a fuel injection valve mounting hole 3 attached with a fuel injection valve J both are opened to a fuel passage 2 in a fuel distributing pipe 1. A pair of partitioning walls 4C and 4D are formed in an atomizing plate 4 with a clearance as being projected to one side from a plane 4E. In addition, the atomizing plate 4 is fittingly set up in the fuel passage 2 of the fuel distributing pipe 1, and thereby an opening part 4H heading for an inner circumferential wall 2A is formed in space between the paired partition walls 4C and 4D. In this connection, the fuel injection valve mounting hole 3 is opposedly set up in the opening part 4H.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for an internal combustion engine, which supplies fuel pressurized by a fuel pump to an intake pipe through a fuel injection valve, and more particularly to a plurality of fuel injection devices. The present invention relates to a structure of fuel distribution pipes to which valves are attached and which distributes fuel to the fuel injection valves.

[0002]

2. Description of the Related Art A fuel supply system in which a pressure regulator is arranged in a fuel tank or in the vicinity of the fuel tank and a return pipe connecting the pressure regulator and the fuel tank is abolished is disclosed in JP-A-6-129325. According to such a fuel supply device, the fuel in the fuel tank is pumped into the fuel distribution pipe by the fuel pump and is injected from the fuel injection valve toward the intake pipe. At least one of the connectors for distributing the fuel from the fuel distribution pipe to each fuel injection valve is opened at the upper part in the fuel distribution pipe. A fuel pipe branched from the fuel pipe upstream of the fuel distribution pipe is installed above the fuel distribution pipe, and the fuel pipe and the fuel distribution pipe are connected by a communication section throttle. According to the above, after the air and vapor gas are stored in the fuel pipe, they are gradually introduced into the fuel distribution pipe via the communication part throttle, and this air is discharged together with the fuel from the fuel injection valve into the intake pipe via the connector. It

[0003]

According to such a conventional fuel supply device, the air stored in the fuel pipe is atomized into the fuel distribution pipe through the communication portion throttle. Since the single communication passage throttle is provided, the air stored in the fuel pipe cannot be effectively atomized. This is because one fuel injection valve is arranged to face the communication portion throttle, but the remaining fuel injection valve is not directly arranged to face the communication portion throttle, and the operation of the remaining fuel injection valve is not. This is because the pulsating pressure generated at times cannot be directly applied to the communication portion throttle. Further, the fuel distribution pipe into which the atomized air flows is extended in the longitudinal direction, and the air in the fuel distribution pipe on the side where the communication part throttle is opened can be miniaturized, but the fuel distribution pipe on the downstream side is In the air, there is a tendency that the air gradually aggregates to form large bubbles, and it is not possible to uniformly discharge the atomized air from all the fuel injection valves. Furthermore,
Fuel pipes and fuel distribution pipes are specially prepared, and they must be connected by a communication part throttle or a branch from a steel pipe pipe, and a plurality of connectors are provided in the fuel distribution pipe so as to project in the longitudinal direction. This is not preferable because the manufacturing cost rises because it must be done.

The present invention has been made in view of the above points, and the pressure regulator is arranged in the fuel tank or in the vicinity of the fuel tank, and is stored in the fuel distribution pipe in the fuel supply device in which the fuel return pipe is abolished. , The air delivered from the fuel pump or the vapor that is stored when the fuel distribution pipe is warmed by the internal combustion engine is surely atomized in the fuel distribution pipe, and this atomized air is sucked from the fuel injection valve. A first object of the present invention is to provide a fuel supply device that can discharge the fuel toward the inside of the pipe and prevent the fuel injection amount from decreasing due to air or vapor. A second object is to provide the fuel injection device at low cost.

[0005]

[Means for Solving the Problems] In order to achieve the above object,
The fuel supply device of the present invention supplies the fuel in the fuel tank to the fuel injection valve attached to the fuel distribution pipe via the fuel pump, the pressure regulator and the main filter,
In a fuel supply device for an internal combustion engine, which injects fuel from a fuel injection valve toward an intake pipe, a fuel passage connected to a fuel pump is provided in a fuel passage formed along a longitudinal axis direction XX of a fuel distribution pipe. An inflow passage and a plurality of fuel injection valve mounting holes for attaching the fuel injection valve are formed so as to be opened.On the other hand, the plate-shaped atomizing plate has a pair of partitions facing each other at intervals in the longitudinal direction. The wall is formed so as to project from the plane of the atomizing plate 4, and the atomizing plate is fitted and arranged in the fuel flow passage of the fuel distribution pipe, whereby the outer end of the partition wall of the atomizing plate and the inner peripheral wall of the fuel flow passage are formed. An opening facing the inner peripheral wall is formed between the partition wall and the pair of partition walls, and the fuel injection valve mounting hole is arranged to face the opening formed by the partition wall. did The first feature and.

Further, according to the present invention, the atomizing plate is formed of a thin metal material, and the flat surface of the atomizing plate is formed by press punching and then bending to form a pair of partition walls having a space therebetween. Is the second feature.

A third feature of the present invention is that, in the atomizing plate, when the fuel injection valve is mounted on the intake pipe, the short piece portion of the atomizing plate is arranged vertically in the direction of gravity. .

[0008]

According to the invention described in claim 1, the fuel in the fuel tank is fed into the fuel passage of the fuel distribution pipe by the fuel pump, and the fuel in the fuel passage is outside the partition wall of the atomizing plate. From the gap formed between the end and the inner peripheral wall of the fuel flow path, it flows into the opening formed by the pair of partition walls. Then, the fuel in the opening is injected into the intake pipe through the fuel injection valve. The air in the fuel flow path moves with the fuel flowing in the fuel flow path and flows into the opening through the gap. On the other hand, due to the opening / closing operation of the fuel injection valve, a pulsating pressure toward the fuel inflow side is generated in the fuel injection valve, and this pulsating pressure acts on the plane of the atomizing plate in the opening via the opening. The pulsating pressure acting on the plane of the atomizing plate is reflected by colliding with the plane, and the reflected pulsating pressure atomizes the air flowing into the opening through the gap. Then, the atomized air is mixed in the fuel flowing from the opening toward the fuel injection valve, and is injected and discharged from the fuel injection valve.

According to the second aspect of the present invention, the partition walls of the atomizing plate are formed by forming the atomizing plate with a thin metal material, and forming a pair of partition walls by press-pressing the flat surface and bending the flat surface. Therefore, the atomized plate can be manufactured very easily and can be provided at low cost.

According to the third aspect of the invention, the air in the fuel passage can be gathered at the upper position, and the air flowing into the opening in the gap at the upper position can be surely miniaturized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fuel supply system for an internal combustion engine according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a fuel distribution pipe to which a fuel injection valve is attached, (B- in FIG. 2).
2 is a vertical cross-sectional view taken along the line AA of FIG. 1. 1
1 is a fuel distribution pipe extending in the left-right direction along the longitudinal axis XX in FIG. 1 and has the following configuration. Reference numeral 2 denotes a fuel flow passage that penetrates from the right end 1A to the left end 1B of the fuel distribution pipe 1 along the longitudinal axis direction XX, and the fuel flow passage is located below the fuel flow passage in FIG. The fuel injection valve mounting hole 3 for attaching the injection valve J is opened. Four fuel injection valve mounting holes 3 in the present embodiment are provided from the right end 1A direction of the fuel distribution pipe 1 to the left, from the first fuel injection valve mounting hole 3 to the fourth fuel injection valve mounting hole 3. Was drilled. Further, a pair of plate fitting grooves 2B having a rectangular cross section along the longitudinal axis direction XX of the fuel flow passage 2 are bored in the inner peripheral wall 2A of the fuel flow passage 2 from the right end 1A to the left end 1B. It The plate fitting groove 2B can be extremely easily manufactured by manufacturing the fuel distribution pipe 1 by extrusion molding or drawing of an aluminum material.

Reference numeral 4 denotes an atomizing plate which is formed of a thin plate material made of a metal material, a synthetic resin material or the like, and which is fitted and arranged in the plate fitting groove 2B. The atomizing plate 4 will be described in detail with reference to the drawings. . FIG.
Is a plan view of the atomizing plate, FIG. 4 is a vertical cross-sectional view taken along the line CC of FIG. 3, FIG. 5 is a perspective view, and FIG. 6 is a right side view of FIG. The atomizing plate 4 has a rectangular shape including a long piece portion 4A extending in the longitudinal direction and a short piece portion 4B orthogonal to the long piece portion 4A, and a pair of partition walls 4C and 4D project at one side from the flat surface 4E at intervals S in the longitudinal direction. Formed. In this example, four partition walls 4C and 4D are provided to face each fuel injection valve mounting hole 3. or,
When this atomizing plate 4 is formed from a thin metal material, it is press-punched into a U shape leaving one piece, and then the tip of the U shape is bent by using one piece as a bending portion to form the atomizing plate 4. A pair of partition walls 4C and 4D protruding from the flat surface 4E are formed with a space S therebetween. According to the above, the through holes 4F are formed on the outer sides of the partition walls 4C and 4D, respectively. Further, it is preferable that the interval S formed by the pair of partition walls 4C and 4D be substantially equal to the hole diameter of the fuel injection valve mounting hole 3.

The above construction is assembled to the fuel distribution pipe 1 as follows. A well-known fuel injection valve J is inserted and attached in each fuel injection valve mounting hole 3 of the fuel distribution pipe 1, and an upstream passage J of the fuel injection valve J is opened in the fuel passage 2. To do. Further, the long piece 4A of the atomizing plate 4 is fitted and arranged from the opening of the right end 1A of the fuel distribution pipe 1 toward the plate fitting groove 2B in the fuel flow path 2. When reaching the left end 1B of the distribution pipe 1, the partition walls 4C and 4D project toward the inner peripheral wall 2A of the fuel passage 2 on the side where the fuel injection valve mounting hole 3 is opened. Then, a first closing cover 5 that closes the opening on the right end 1A of the fuel distribution pipe 1 is arranged, and a second closing cover that closes the opening on the left end 1B of the fuel distribution pipe 1 is formed. The cover 6 is arranged. The fuel inflow passage 7 provided in the second closing cover 6 opens into the fuel flow passage 2.

According to the above, a continuous gap P is formed between the outer ends 4J of the partition walls 4C and 4D provided on the atomizing plate 4 and the inner peripheral wall 2A of the fuel passage 2, and the pair of partition walls 4C and 4D are formed. An opening 4H is formed between the opening S and the gap S, and at this time, each fuel injection valve mounting hole 3 is arranged so as to face each opening 4H. The gap P is well shown in FIG. 2 and the opening 4H is well shown in FIG.

The fuel distribution pipe 1 to which the fuel injection valve J and the atomizing plate 4 are attached is shown in FIG.
It is attached to an internal combustion engine (hereinafter simply referred to as "engine"). An intake port 13 and an exhaust port 14 connected to the combustion chamber 12 are opened in a cylinder head 11 arranged on an upper surface of a cylinder block 10 of the engine, and the intake port 13 is provided with an intake pipe 15 and a throttle valve. A throttle body 16 is connected, and an air cleaner 17 is arranged on the upstream side of the throttle body 16. The tip of the fuel injection valve J attached to the fuel distribution pipe 1 is inserted and arranged in the intake pipe 15, and the injection hole (not shown) of the fuel injection valve J is opened toward the inside of the intake pipe 15. To do.

Reference numeral 18 is a fuel tank for storing fuel therein, 19 is a fuel pump for sucking and discharging the fuel in the fuel tank 18, and 20 is the fuel pressure discharged from the fuel pump 19 to atmospheric pressure. Alternatively, it is a pressure regulator that keeps the intake pipe negative pressure constant, and is arranged in the fuel tank 18 or in the vicinity of the fuel tank 18. Reference numeral 21 is a main filter for removing foreign matter contained in the fuel.

The fuel in the fuel tank 18 is pressurized by the fuel pump 19, and the pressure regulator 2
0, the main filter 21, and the fuel inflow passage 7 to be fed into the fuel flow passage 2 of the fuel distribution pipe 1.

Next, the operation will be described. During operation of the engine, the fuel fed from the fuel pump 19 flows from the fuel inflow passage 7 into the fuel flow passage 2 of the fuel distribution pipe 1,
Outer end 4J of partition walls 4C and 4D of atomizing plate 4
From the continuous gap P formed between the inner peripheral wall 2A of the fuel flow passage 2 and the inner peripheral wall 2A of the fuel flow passage 2 into the opening 4H formed between the opposing partition walls 4C and 4D, and then at this opening 4H. Fuel is injected from the fuel injection valve J into the intake pipe 15. On the other hand, the fuel fed into the fuel flow passage 2 of the fuel distribution pipe 1 contains air for some reason, and this air also flows along with the flow of the fuel into the partition wall 4
The gap P between the outer end 4J of C and 4D and the inner peripheral wall 2A of the fuel inflow passage 2 flows into the opening 4H between the partition walls 4C and 4D.

On the other hand, the fuel injection valve J is synchronized with the operation of the engine.
Is operated, the needle valve of the fuel injection valve J intermittently opens and closes the valve seat hole (the needle valve and the valve seat hole are not shown since they are known). Pulsating pressure is generated toward the upstream flow path J1 of J. Then, this pulsating pressure acts from the fuel injection valve mounting hole 3 to which the fuel injection valve J is attached to the opening 4H of the atomizing plate 4 arranged so as to face the fuel injection valve mounting hole 3.

According to the above, the pulsating pressure acting on the opening 4H of the atomizing plate 4 collides with the flat surface 4E of the atomizing plate 4 inside the opening 4H, and the pulsating pressure reflected here is outside the partition walls 4C, 4D. It goes toward a gap P formed between the end 4J and the inner peripheral wall 2A of the fuel flow path 2. Therefore,
The air contained in the fuel passes through the gap P and the opening 4H.
Although it is an inflow pipe, it is affected by this pulsating pressure in the gap P, and the air is subdivided into fine bubbles in the gap P. When the fuel injection valve J injects fuel, the micro-sized bubbles flow into the fuel injection valve J together with the fuel when the fuel injection valve J injects the fuel, and the air bubbles are injected toward the intake pipe 15. Are discharged.

As described above, the air contained in the fuel fed from the fuel pump 19 to the fuel flow path 2 flows through the gap P formed at the outer ends 4J of the partition walls 4C and 4D of the atomizing plate 4. When passing with, the pulsating pressure that collides and reflects in the opening 4H acts on the gap P, so that the air is subdivided into fine bubbles, and the fine bubbles are injected by the fuel injection valve J. Intake pipe 15 with fuel
Since it is discharged inside, air does not stay in the fuel distribution pipe 1. Then, since the air discharged from the fuel injection valve J is minute and is limited to extremely small amounts,
At the time of injection of the fuel injection valve J, a decrease in the fuel injection amount due to air entrapment is suppressed.

When the pressure regulator 20 is arranged in the fuel tank 18 or in the vicinity of the fuel tank 18, the air in the fuel flow passage 2 of the fuel distribution pipe 1 is automatically atomized and the fuel injection valve is injected. Since the air is sequentially discharged from J, the problem that the air stays in the fuel distribution pipe 1 or the air of large bubbles is discharged from the fuel injection valve J at once is solved. The fuel distribution pipe 1 is arranged relatively close to the engine, and the fuel distribution pipe 1 may be warmed by the heat of the engine to generate vapor therein. Similarly to the above, the fuel is atomized and discharged into the intake pipe 15 together with the fuel injected from the fuel injection valve J.

Further, since the pulsating pressure generated in the fuel injection valve J is used as energy for refining the air by the gap P, this pulsating pressure is attenuated, and according to this, the pipe located upstream of the fuel distribution pipe 1 It is possible to reduce the transmission of pulsation to the inside, and noise caused by pulsation pressure, for example, the main filter 2
It is possible to effectively reduce noise and the like generated by hitting the pulsating pressure.

Further, the fact that the atomizing plate 4 in the fuel distribution pipe 1 is arranged and its external shape does not greatly change does not limit the degree of freedom of mounting on the engine, and a highly compatible fuel distribution pipe can be used. Can be provided.

Further, in manufacturing the atomizing plate 4 having the partition walls 4C and 4D, the atomizing plate 4 is formed of a thin metal material, and the flat surface 4E is formed by press punching and then bending. Therefore, the manufacturing is extremely short. This is something that can be done in a short time, and it has been possible to prevent an increase in manufacturing costs.

Further, when the fuel injection valve J is attached to the intake pipe, the short piece portion 4B of the atomizing plate 4 is arranged vertically in the gravity direction. The pulsating pressure that easily collects at P and collides with the flat surface 4E of the atomizing plate 4 that faces the opening 4H is also easily directed toward the upward gap P, which allows more effective atomization of air. Can be achieved.

[0027]

As described above, according to the first aspect, the air in the fuel inflow passage of the fuel distribution pipe flows down through the gap formed at the outer end of the partition wall. At this time, the pulsating pressure generated in the fuel injection valve toward the gap collides with the plane of the atomizing plate in the opening and is reflected and acts on this gap, so that the air is actively subdivided into fine bubbles in this gap. The atomized bubbles are well mixed with the fuel, and are injected into the intake pipe together with the fuel injected from the fuel injection valve. Thus, the air in the fuel distribution pipe can be discharged without affecting the fuel injection amount of the fuel injection valve. Further, the pulsating pressure generated in the fuel injection valve is digested and attenuated by atomizing the air in the gap, so that the noise in the fuel pipe due to the pulsating pressure can be reduced. Further, the fact that the atomizing plate may simply be fitted and arranged in the fuel flow passage inside the conventional fuel distribution pipe structure does not limit the degree of freedom of mounting on the engine and is compatible. Therefore, it can be easily adopted. Further, the pulsating pressure generated in the fuel injection valve acts on the opening between the partition walls facing it, so that the pulsating pressure of this fuel injection valve does not act on other fuel injection valves, and it is more stable. The injection amount can be controlled.

According to the second aspect of the present invention, the atomizing plate can be manufactured extremely easily and in a short time, and in particular, the manufacturing cost of the atomizing plate can be reduced.

According to the third aspect of the present invention, the air in the fuel distribution pipe can be easily gathered in a part, and the pulsating pressure can be easily applied to the gathered air. It was possible to achieve the miniaturization of.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a fuel distribution pipe used in a fuel supply system for an internal combustion engine of the present invention.

FIG. 2 is a longitudinal sectional view of a main part taken along the line AA of FIG.

FIG. 3 is a plan view of an atomizing plate 4 used in FIG.

FIG. 4 is a vertical sectional view taken along the line CC of FIG.

5 is a perspective view of the atomizing plate shown in FIG.

FIG. 6 is a right side view of the atomizing plate in FIG.

FIG. 7 is a system diagram showing a state in which the fuel distribution pipe shown in FIG. 1 is attached to an internal combustion engine.

[Explanation of symbols]

 1 Fuel distribution pipe 2 Fuel flow path 3 Fuel injection valve mounting hole 4 Atomize plate 4C, 4D A pair of partition walls 4E Atomize plate plane 4H Opening 4J Outer end J Fuel injection valve

Claims (3)

[Claims] 1. A fuel in a fuel tank is supplied to a fuel injection valve attached to a fuel distribution pipe through a fuel pump, a pressure regulator and a main filter, and the fuel is injected from the fuel injection valve toward an intake pipe. In the fuel supply device for an internal combustion engine, the longitudinal direction X- of the fuel distribution pipe 1
A fuel pump 19 is provided in the fuel flow path 2 formed along X.
And a plurality of fuel injection valve mounting holes 3 for attaching the fuel injection valve J are formed to open.
On the other hand, the plate-shaped atomizing plate 4 is formed with a pair of partition walls 4C and 4D facing each other at intervals S in the longitudinal direction so as to project from the flat surface 4E of the atomizing plate 4,
The atomizing plate 4 is connected to the fuel passage 2 of the fuel distribution pipe 1.
Atomize plate 4 by fitting and arranging inside
And a pair of partition walls 4 are formed between the outer ends 4J of the partition walls 4C and 4D and the inner peripheral wall 2A of the fuel flow path 2.
The opening 4 toward the inner peripheral wall 2A during the interval S between C and 4D
A fuel supply device for an internal combustion engine, wherein H is formed, and the fuel injection valve mounting hole 3 is arranged so as to face the opening 4H formed by the partition walls 4C and 4D. 2. The atomizing plate 4 is formed of a thin metal material, and a flat surface 4E of the atomizing plate 4 is press-punched and then bent to form a pair of partition walls 4C and 4D having a space S therebetween. The fuel supply device for an internal combustion engine according to claim 1, wherein the fuel supply device is formed. 3. The atomizing plate 4 is characterized in that, when the fuel injection valve J is attached to the intake pipe 15, the short piece portion 4B of the atomizing plate 4 is arranged vertically in the gravity direction. 2. A fuel supply device for an internal combustion engine according to 1.