JP3310144B2 - Fuel piping system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel piping device suitable for use in, for example, an internal combustion engine of an automobile or the like.

[0002]

2. Description of the Related Art In general, as a fuel piping device for an internal combustion engine of an automobile or the like, a distribution pipe is provided with a pipe having a fuel passage formed therein, and a pipe having a fuel passage formed therein in order to improve weight reduction and workability. A plurality of injection valve connection ports provided at intervals in the axial direction are integrally molded with a resin material, and are integrated with the pipe when the resin is molded to reinforce the pipe of the distribution pipe. There is known a structure in which an insert metal fitting is embedded in a hole (for example, Japanese Utility Model Laid-Open No. 5-12664).
No.).

[0003] In this conventional fuel piping device, a plurality of injection valve connection ports are formed in the longitudinal direction of the pipe so as to correspond to the fuel injection valves provided for each cylinder. The injection valve connection port communicates with a fuel passage inside the tube.

The base end of each fuel injection valve is connected to an injection valve connection port, and the front end is disposed so as to protrude into the intake passage of each cylinder. The fuel can be directly injected into the intake passage via the fuel injection valve. Thus, the fuel piping device can directly supply fuel without branching the piping to each cylinder.

A resin bracket for attaching the pipe to the internal combustion engine is integrally formed on the outer peripheral surface of the pipe of the distribution pipe, and the bracket connects the fuel injection valve to each injection valve connection port by the bracket. In this state, it is fixed to the internal combustion engine by means such as bolting.

On the other hand, on the outer peripheral surface of the pipe of the distribution pipe, an insert fitting for reinforcing the pipe is buried along the longitudinal direction to integrally reinforce the resin pipe.

Here, in the fuel piping device according to the prior art, the insert fitting is embedded only in the pipe body, and the connecting portion between the insert fitting and the bracket is formed only of resin, so that the connecting portion has sufficient strength. There was a problem that it could not be secured.

In order to solve this problem, there has been proposed another prior art fuel piping device as described in, for example, Japanese Patent Application Laid-Open No. 1-96464. In this fuel piping apparatus, the pipe and the bracket are integrally formed of a resin material, and a reinforcing plate made of a metal material is provided as a separate member so as to be pressed from the outside of the pipe and the bracket. and it is configured to reinforce the bracket.

[0009]

By the way, in the above-mentioned other prior art, a resin distribution pipe and a metal reinforcing plate are formed as separate members, and the reinforcing plate covers the distribution pipe from outside. However, there is a problem that deformation such as warpage may occur at the stage of forming the resin distribution pipe, or deformation such as distortion may occur due to deterioration over time.

[0010] Further, since the bracket which comes into contact with the intake passage is made of a resin material having low thermal conductivity, and the pipe body and the intake passage make metallic contact with good thermal conductivity only by bolts inserted into the bracket, Heat conducted from each high-temperature cylinder (combustion chamber) side to the pipe via the fuel injection valve cannot be effectively conducted to the intake passage side, and the fuel flowing through the fuel passage becomes high temperature and The fuel injection amount to the cylinder may become unstable.

Further, in the step of assembling the fuel pipe device, it is necessary to abut a bolt on the reinforcing plate, which is a separate member, from the outside while holding the pipe body at the mounting position. Need extra.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and embeds an insert fitting in a resin distribution pipe by insert molding, and integrally forms a bracket with the insert fitting, thereby improving strength and strength. It is an object of the present invention to provide a fuel pipe device that enhances a heat radiation effect.

[0013]

According to the present invention, there is provided a fuel pipe device comprising a pipe having a fuel passage formed therein and a plurality of injection valve connection ports provided at intervals in an axial direction of the pipe. a dispensing tube formed by integrally molded Ri by the configured-fit the tube body which reinforces the tubular body of該分pipe from an insert fitting that will be integrally embedded in the tube body when the resin molding.

Then, in order to solve the above-mentioned problem,
A feature of the configuration adopted by the invention according to claim 1 is that the insert fitting includes a plate that extends along an axial direction of a pipe body of the distribution pipe and is partially curved along a circumferential direction of the pipe body, eyes the plate mounting the distribution pipe to the internal combustion engine
The bottom surface side is spaced apart in the length direction and the bottom
And a plurality of brackets that are fixed in contact with the attachment portion .

In the invention according to the second aspect, the bracket of the insert fitting has a mounting hole on the inner peripheral side.
A cylindrical boss portion Ru <br/> have a structure comprising projecting integrally formed.

Further, in the invention according to the third aspect, the bracket of the insert fitting is provided in the axial direction of the distribution pipe.
Configuration and obtained by forming a position different from the injection valve connecting port
You are.

[0017] On the other hand, in the invention according to claim 4, the bracket of the insert fitting is provided on the bracket in the circumferential direction of the distribution pipe.
A configuration formed at a position different from the injection valve connection port;
You are.

[0018]

According to the first aspect of the present invention,
Since a plurality of brackets are provided integrally with each other in the axial direction with respect to the plate of the insert fitting, the pipe of the distribution pipe and the connecting portion between the pipe and the bracket can be strengthened, and the distribution pipe is formed of a metal bracket. It can be firmly attached to the internal combustion engine. When the distribution pipe is mounted via a metal bracket having good heat conductivity ,
When the bracket is in contact with the mounting
Since the, it is possible to improve the heat radiation and thermal conductivity from the distribution pipe.

Further, in the invention according to claim 2, the gold
A cylindrical boss with a mounting hole on the inner peripheral side of a metal bracket
Since the boss part is integrally formed, it fits in the mounting hole of the boss part.
The bracket can be fixed with bolts etc.
The piping device can be securely attached to the internal combustion engine.

According to the third aspect of the present invention, since the bracket is formed at a different position in the axial direction with respect to the injection valve connection port of the distribution pipe, the bracket and the injection valve connection port may interfere with each other. In addition, the distribution pipe can be attached to the internal combustion engine.

Further , according to the invention described in claim 4, the bracket is connected to the injection valve connection port of the distribution pipe in a circumferential direction.
The bracket and the injection valve connection port
And it can be taken the distribution pipe to the internal combustion engine <br/> put without the interfering with each other.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 to 5 show a first embodiment.

In FIG. 1, reference numeral 1 denotes a fuel piping device according to the present embodiment. The fuel piping device 1 is provided in an internal combustion engine of an automobile or the like from a fuel tank to each cylinder (none is shown).
2 and a part of a fuel supply passage communicating with
As shown in (1), it is fixed via bolts 12 to an outer surface of an intake passage 11 of the internal combustion engine described later. The fuel piping device 1 is generally constituted by a distribution pipe 2 described below made of a resin material, and an insert fitting 6 made of metal, which is integrally formed on the distribution pipe 2 by means such as insert molding. I have.

Reference numeral 2 denotes a distribution pipe which constitutes the fuel pipe apparatus 1. The distribution pipe 2 is formed of a resin material, and has a pipe 3 through which fuel flows, which will be described later, and is located on the outer peripheral surface of the pipe 3. Each injection valve connection port 4 described below, which forms a cylindrical opening, is roughly constituted.

Reference numeral 3 denotes a pipe constituting the distribution pipe 2, and an internal space of the pipe 3 forms a fuel passage 3A through which fuel flows. Also, 4, 4,... Are, for example, four injection valve connection ports formed to protrude in the radial direction on the outer peripheral surface of the pipe body 3 and opened as short cylinders. As shown in the figure, a fuel injection valve 10 described later is connected. Each injection valve connection port 4 is connected to the fuel passage 3A of the pipe 3.
And the fuel flowing through the fuel passage 3 </ b> A is supplied into the fuel injection valve 10 through each of the injection valve connection ports 4,
The fuel is injected into each cylinder.

Reference numerals 5 and 5 denote bracket covers formed integrally with the tubular body 3 by resin molding.
As shown in FIG. 2, it is formed so as to protrude from the outer peripheral surface of the tube 3, and is formed so as to cover the upper surface side of a bracket 8 described later.

Reference numeral 6 denotes an insert fitting which constitutes the fuel piping device 1 together with the distribution pipe 2. The insert fitting 6 is shown in FIG.
As shown in FIG. 2, it is formed by, for example, press molding a metal plate, and as shown in FIG. 2, it is integrally formed with the distribution pipe 2 by, for example, insert molding. The insert fitting 6 is generally constituted by a plate 7 described below embedded in the tube 3 and brackets 8.

Numeral 7 denotes a plate constituting the insert fitting 6, which is formed as a long curved plate having a substantially arcuate cross section, and a shaft inside the pipe 3 of the distribution pipe 2 as shown in FIG. It is composed of a curved portion 7A embedded along the direction and a flat portion 7B extending flat downward from the curved portion 7A. Further, brackets 8 to be described later are separately provided on the flat portion 7B of the plate 7, and the flat portion 7B is bent so that the flat portion 7B is bent to the opposite side to the curved portion 7A.
And is formed so as to project vertically.

Numerals 8 and 8 denote two brackets provided on the plate 7 to constitute the insert fitting 6, and each bracket 8 has a flat portion 7 of the plate 7 as shown in FIG.
B is formed in a flat plate shape spaced apart in the longitudinal direction, and the flat portion 7
B is formed to project perpendicularly from the flat portion 7B so as to bend B to the opposite side to the curved portion 7A. In the vicinity of the center of each bracket 8, a cylindrical boss 9 described later is formed so as to protrude vertically upward, and a bolt hole 9A is formed in the boss 9 and inserted into the bolt hole 9A. Bolt 1
2, the fuel piping device 1 is connected to the bottom surface 8A of the bracket 8
Is fixed in a state of contact with the intake passage 11 of the internal combustion engine.

Reference numerals 9 and 9 denote boss portions as mounting portions formed on the brackets 8 of the insert fitting 6, and the boss portions 9 are located at the central portions of the flat plate-shaped brackets 8 and have a tubular shape. And is formed to project vertically upward. A bolt hole 9A is formed in each boss portion 9 as a mounting hole penetrating in the axial direction, and a bolt 12 inserted into the bolt hole 9A and a bolt hole 11B of a passage side bracket 11A of the intake passage 11 described later. , The fuel piping device 1 is fixed to the intake passage 11.

Reference numeral 10 denotes a fuel injection valve (1) provided for each cylinder.
Each fuel injection valve 10 has a stepped cylindrical shape, and an inlet 10A is provided at the base end and an injection port 10A is provided at the tip end.
B are provided respectively. Each of the fuel injection valves 10 has an inlet 10A side connected to an opening end of each injection valve connection port 4 and each injection valve connection port 4 with the injection port 10B protruding into the intake passage 11. Is housed.

Reference numeral 11 denotes an intake passage provided in the vicinity of each cylinder of the internal combustion engine. A passage-side bracket 11A protrudes from an outer surface of the intake passage 11, and a bolt hole 11B is formed in the passage-side bracket 11A. Boss 9
The fuel piping device 1 is bolted and fixed to the intake passage 11 via the bolt holes 9A and the bolts 12 inserted into the bolt holes 11B. A small-diameter hole into which the injection port 10B of the fuel injection valve 10 is fitted is formed on each cylinder side of the intake passage 11. The fuel injection valve 10 projects the injection port 10B into the intake passage 11 from this hole. I have.

The fuel pipe device 1 according to the present embodiment has the above-described configuration, and its mounting and operation will now be described.

In the fuel pipe device 1, each bracket 8 of the insert fitting 6 integrally formed with the distribution pipe 2 is brought into contact with a passage-side bracket 11A provided in an intake passage 11 of an internal combustion engine. The bolt 12 is inserted into the bolt hole 9A of the boss 9 formed in the bracket 8 and the bolt hole 11B of the passage side bracket 11A, and is bolted.

As a result, the fuel piping system 1 allows the bottom surface 8A of each bracket 8 to be
While being in contact with the upper side surface of 1A, it is fixed to the intake passage 11 via each bracket 8 and the passage side bracket 11A.

On the other hand, the fuel flowing through the distribution pipe 2 of the fuel piping device 1 is supplied from the injection port 10B of each fuel injection valve 10 to the fuel injection valve 10 through the injection valve connection port 4 provided in the distribution pipe 2. The fuel is injected into the intake passage 11 from the injection port 10B toward each cylinder.

As described above, the distribution pipe 2 of the fuel pipe device 1 is formed from a resin material, and the plate 7 of the metal insert fitting 6 is insert-molded into the pipe 3 of the distribution pipe 2.
Since each bracket 8 is formed integrally with the plate 7, the distribution pipe 2 can be fixed integrally with the insert fitting 6, and the distribution pipe 2 is reliably prevented from being deformed such as warping or distortion. can do. Further, the connecting portion between the pipe 3 and each bracket 8 can be strengthened, and the strength of the fuel piping device 1 and the state of attachment to the internal combustion engine can be improved.

Thus, in this embodiment, the distribution pipe 2
Since the insert fitting 6 is provided by insert molding and the brackets 8 are integrally formed as a part of the insert fitting 6, the connection portion between the distribution pipe 2 and each bracket 8 can be reliably reinforced, and the fuel piping device 1 can be securely attached to the internal combustion engine, and the durability and reliability of the fuel piping device 1 can be greatly improved.

The bolts 12 are securely inserted into the respective brackets 8 by being inserted into the bolt holes 9A of the cylindrical boss portions 9 formed integrally with the respective brackets 8, so that the bolts 12 are securely fitted into the respective brackets 8. The fuel piping device 1 can be firmly fixed to the intake passage 11 via the bolts 12, and the mounting state of the fuel piping device 1 can be greatly improved.

The insert fitting 6 made of a metal plate having good heat conductivity is embedded such that a plate 7 forming one end surrounds the fuel passage 3A in the pipe 3, and the other end forms each bracket 8 as a bracket. Since the entire bottom surface 8A abuts on the metal intake passage 11, heat of the fuel pipe device 1 is transferred through the metal passage as shown by arrow A in FIG.
Thus, the heat conduction or heat radiation of the fuel pipe device 1 can be greatly improved, and the temperature of the pipe 3 and the fuel inside can be prevented.

As a result, it is possible to reduce the amount of vapor generated in the fuel, to prevent the fuel injection amount from becoming unstable and to reduce the operating performance of the internal combustion engine. Stable performance can be secured.

Also, since the distribution pipe 2 and the insert fitting 6 are integrally formed, the fuel pipe apparatus 1 can have the necessary strength without assembling a separate reinforcing plate or the like at the time of assembling as in the prior art. Therefore, an increase in the number of assembling steps can be suppressed. Furthermore, since the brackets 8 of the insert fittings 6 are provided at different positions in the axial direction and the circumferential direction of the pipe body 3 with respect to the respective injection valve connection ports 4 on the outer peripheral surface of the pipe body 3, The fuel piping device 1 can be attached to an internal combustion engine or the like without interfering with each other in the positional relationship between the injection valve connection ports 4, and the position where the fuel piping device 1 can be attached to the internal combustion engine can be expanded.
Work such as design change can be easily performed.

In the above embodiment, the mounting position of the fuel pipe device 1 is, for example, the outer peripheral surface of the intake passage 11 near each cylinder. However, the present invention is not limited to this. It may be attached to a bracket provided on the engine main body side, or the shape of each bracket 8 of the insert fitting 6 may be modified according to the condition of the attachment position. For example, as shown in a modification shown in FIG. Even if the flat portion 7B 'of the plate 7' constituting the 6 'is formed to be long, the same operation and effect as in this embodiment can be obtained. In the modification, the same components as those in the first embodiment are denoted by dashes ('), and description thereof will be omitted.

Next, FIG. 6 shows a second embodiment according to the present invention. Components similar to those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

However, the feature of the present embodiment is that the fuel piping device 31 is formed except for the bracket cover 5 provided on each bracket 8 of the fuel piping device 1 in the first embodiment. Therefore, in this embodiment, the portions of the brackets 8 and the boss portions 9 are in a state where the metal material is exposed.

Thus, in this embodiment, the same operation and effect as those of the first embodiment can be obtained. However, the fuel pipe device 31 of this embodiment is provided above each bracket 8 in the first embodiment. Since the brackets 5 which are positioned and protruded from the outer peripheral surface of the pipe body 3 are removed, the resin material required for forming the distribution pipe 2 can be reduced, and the cost can be reduced. In addition, the heat radiation effect can be enhanced by increasing the exposed area of the insert fitting 6.

In each of the above embodiments, for example, 2
Although the brackets 8 are formed in the fuel piping device 1, the present invention is not limited to this, and three or more brackets may be provided according to the size, shape, mounting position, and the like of the distribution pipe 2.

In each of the above embodiments, for example, 4
Although the case where the fuel piping device is applied to an internal combustion engine having cylinders has been described as an example, the present invention is not limited to this, and may be applied to an internal combustion engine having an arbitrary number of cylinders of two or more cylinders. The present invention can also be applied to an internal combustion engine composed of cylinders by changing the number of injection valve housings and brackets.

Further, in each of the above embodiments, the case where the boss portion 9 as the mounting portion is provided with the bolt hole 9A is illustrated.
The nut member having a female thread may be integrally formed by means such as welding.

[0051]

As described in detail above, according to the first aspect of the present invention, the insert fitting integrally embedded in the pipe of the distribution pipe is moved along the axial direction of the pipe. Of the tube
And plates partially curved along a circumferential direction, the distribution
Separate the length of the plate to attach the tubes to the internal combustion engine
The bottom side is formed in contact with the mounting portion of the internal combustion engine.
Constituted by a plurality of brackets which are fixed in a state treasure, can enhance the connection portion between the tube and the tube body and the bracket of the distribution pipe, also the distribution pipes firmly against the internal combustion engine by metal bracket Ru can be mounted. Soshi
Thus , the fuel piping device can be stably mounted on the internal combustion engine for a long period of time, and the durability and reliability of the fuel piping device can be greatly improved.

[0052] Further, when mounting the internal combustion engine side through the bracket made of good thermal conductivity metal distribution tube, the bra
The bracket is fixed with the bottom side in contact with the mounting part of the internal combustion engine.
Since the constant, the Ki out to enhance the heat radiation or heat conductivity from the distribution pipe, distribution pipes inside the fuel can be prevented from a high temperature Rutotomoni, an internal combustion engine fuel injection amount becomes unstable It is possible to reliably prevent a decrease in the driving performance of the vehicle.

[0053] Further, in the invention described in claim 2,
A cylindrical volume whose inner circumferential side becomes the mounting holes in the metal bracket
Since the boss portion is integrally formed, the mounting hole of the boss portion is
The bracket can be fixed with bolts etc.
The fuel piping system is firmly connected to the internal combustion engine through these bolts, etc.
At the same time as installing the fuel piping device
The condition can be greatly improved .

According to the third aspect of the present invention,
By forming the bracket at a different position in the axial direction with respect to the injection valve connection port of the distribution pipe, the bracket allows the distribution pipe to be attached to the internal combustion engine without interfering with the injection valve connection port in a positional relationship. The position where the device can be mounted on the internal combustion engine can be expanded.

Further , in the invention described in claim 4, the bracket is connected to the injection valve connection port of the distribution pipe in the circumferential direction.
The Rukoto be formed in different positions, brackets are injection
The dispensing tube without interfering with the positional relationship between the valve connecting port can be mounted Rukoto to an internal combustion engine, the fuel pipe device can extend the <br/> with possible positions taken in the internal combustion engine.

[Brief description of the drawings]

FIG. 1 is an overall view showing a fuel piping device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which the fuel piping device according to the first embodiment is attached to an intake passage of an internal combustion engine.

FIG. 3 is a perspective view showing an insert according to the first embodiment.

FIG. 4 is an enlarged cross-sectional view of the fuel piping device, showing a main part in FIG. 2 in an enlarged manner.

FIG. 5 is a longitudinal sectional view similar to FIG. 2, showing a modification according to the first embodiment.

FIG. 6 is a longitudinal sectional view similar to FIG. 2, showing a second embodiment.

[Explanation of symbols]

 1, 1 ', 31 Fuel piping device 2, 2' Distributing pipe 3 Tube 3A Fuel passage 4 Injection valve connection port 6, 6 'Insert fitting 7, 7' Plate 8 Bracket 9 Boss (mounting part) 9A Bolt hole ( (Mounting hole) 10 Fuel injection valve 11 Intake passage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02M 55/02 340 F02M 55/02 350 F02M 55/02 320

Claims (4)

(57) [Claims] And 1. A comprising an internal fuel passage formed in the tubular body and the tube body plurality of injection valves connected ports provided axially with a spacing of molded integrally Ri by the resin material dispensing tube, a fuel piping system consisting of an insert fitting that will be integrally embedded in the tube body when the fit said tube body which reinforces the tubular body of該分piping resin molding, before Symbol insert fittings, of the distribution pipe and the pre <br/> over preparative curved circumferentially along partly of the tube the tube member extends in the axial direction of, the order the playing <br/> bets the distribution pipe was attached to the internal combustion engine The internal combustion engine is formed so as to be spaced apart in the length direction and the bottom side is
And a plurality of brackets fixed in contact with the mounting portion of the fuel pipe. 2. The bracket of the insert fitting,
A cylindrical boss with a mounting hole on the inner peripheral side is integrally formed to protrude
The fuel delivery apparatus of claim 1 which is formed by. Bracket according to claim 3, wherein the insert fitting, fuel delivery apparatus of claim 1 or 2 obtained by forming a position different from the injection valve connection port in the axial direction of said distribution pipe. Bracket according to claim 4, wherein the insert fitting, fuel delivery apparatus of claim 1, 2 or 3 obtained by forming a position different from the amount the injection valve connection port in the circumferential direction of the pipe.