JPH08189441A - Resin fuel distributing pipe - Google Patents

Abstract

PURPOSE: To prevent defects in insulation and in airtightness between current carrying lines because of deformation of the current carrying lines during molding in a resin made fuel distributing pipe in which the current carrying lines to a fuel injection valve are buried. CONSTITUTION: A resin made fuel distributing pipe is provided with a fuel passage 1a which extends in the longitudinal direction of the fuel distributing pipe and is connected to respective fuel injection valves 4, current carrying lines 2a, 2b to the respective fuel injection valves 4, the first resin part 10 which are previously molded so as to support the current carrying lines 2a, 2b in the preset positions inside a product die firmly, and the second resin part 20 formed between the first resin part 10 and the product die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel distribution pipe for distributing fuel to each fuel injection valve, the resin distribution pipe being made of resin and having an energization line embedded in each fuel injection valve. Regarding

[0002]

2. Description of the Related Art A conventional fuel distribution pipe has been formed by processing a metal member, but Japanese Patent Application No. 6-2036.
No. 36 proposes a resin fuel distribution pipe that is molded into a product shape in order to reduce the cost by omitting processing and to reduce the amount of heat received from the engine.

In this resin fuel distribution pipe, a metal bar is embedded at the time of molding and electrically insulated by a resin as a power supply line to each fuel injection valve connected thereto. With such a configuration, wiring work for each fuel injection valve can be omitted as compared with the metal fuel distribution pipe, and the overall cost can be further reduced.

[0004]

In the resin fuel distribution pipe described above, a set pin or the like is generally used when setting the metal bar in the mold for embedding and molding, but for this reason, molding is performed. A hole remains when the set pin is removed from the product, and it is difficult to fill this hole completely in a watertight manner, and water invades through this hole during use to corrode the metal bar or other metal bars. Insulation failure such as short circuit may occur. Also, since the metal bar is relatively long, it is easy to deform when the resin is pressed into the mold even if it is fixed at several points with the set pin, and if the metal bars come into contact with each other and the resin hardens, insulation failure will occur. When the resin hardens by contacting the mold core for forming the fuel passage,
The airtightness of the fuel passage is caused, neither of them becomes a product, and the yield of molded products may be poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a resin fuel distribution pipe in which an energization line for each fuel injection valve can be embedded and molded without causing the above-mentioned problems.

[0006]

According to a first aspect of the present invention, there is provided a resin fuel distribution pipe according to the present invention, a fuel passage extending in a longitudinal direction of the pipe and communicating with each fuel injection valve, and a fuel passage to each fuel injection valve. A current-carrying line, a first resin part preformed so as to firmly support the power distribution line at a predetermined position in a product mold, and a molded part between the first resin part and the product mold And a second resin portion.

According to a second aspect of the present invention, there is provided the resin fuel distribution pipe according to the first aspect, wherein the fuel passage is formed in the first resin portion. Characterize.

According to a third aspect of the present invention, in the resin fuel distribution pipe according to the first aspect, the fuel passage is formed in the second resin portion. Characterize.

Further, a resin fuel distribution pipe according to the present invention according to claim 4 is the resin fuel distribution pipe according to claim 1, wherein the resin forming the first resin portion and the second resin portion are The resin to be formed has substantially the same thermal expansion coefficient.

The resin fuel distribution pipe according to a fifth aspect of the present invention is the resin fuel distribution pipe according to the first aspect, wherein the melting point of the resin forming the first resin portion is the second It is characterized by being lower than the melting point of the resin forming the resin portion.

Further, a resin fuel distribution pipe according to the present invention according to claim 6 is the resin fuel distribution pipe according to claim 1, wherein the joint surface between the first resin portion and the second resin portion is Is characterized in that an uneven portion is provided.

[0012]

In the resin fuel distribution pipe according to the present invention as set forth in claim 1, the first resin portion is preformed to firmly set the energization line at a predetermined position in the product mold. There is no need for pins, and then the second resin portion is molded between the first resin portion and the product mold,
The current-carrying line is not deformed when the second resin portion is molded.

In the resin fuel distribution pipe according to the present invention as defined in claim 2, in the resin fuel distribution pipe according to claim 1, since the fuel passage is already formed in the first resin portion, At the time of molding the second resin portion, a cured resin layer exists between the energization line and the fuel passage, and the airtightness of the fuel passage is maintained.

The resin fuel distribution pipe according to a third aspect of the present invention is the resin fuel distribution pipe according to the first aspect, wherein the first resin portion has a predetermined energization line within the product mold. In order to firmly support the position, the current-carrying lines do not deform and contact each other during the molding of the second resin portion, so that insulation failure does not occur.

A resin fuel distribution pipe according to a fourth aspect of the present invention is the resin fuel distribution pipe according to the first aspect, wherein the resin forming the first resin portion and the second resin portion are formed. Since the resin and the resin have substantially the same coefficient of thermal expansion, the thermal expansion and contraction amounts of the first resin portion and the second resin portion are substantially equal to the temperature change during use of the resin fuel distribution pipe. It is possible to prevent the generation of thermal stress.

The resin fuel distribution pipe according to a fifth aspect of the present invention is the resin fuel distribution pipe according to the first aspect, wherein the melting point of the resin forming the first resin portion is the second resin portion. Since the melting point is lower than the melting point of the resin forming the resin, the surface of the first resin portion is melted during the molding of the second resin portion, and the two are surely fused to each other to have a very large joint strength.

Further, the resin fuel distribution pipe according to the present invention according to claim 6 is the resin fuel distribution pipe according to claim 1, wherein the joint surface between the first resin portion and the second resin portion is uneven. Since the portion is provided, the joint area between the both is increased, and the uneven portion of the first resin portion is easily melted when the second resin portion is molded.

[0018]

1 is a longitudinal sectional view of a resin fuel distribution pipe 1 according to the present invention, in which a central portion is cut at a position where a bus bar 2 extends, and both ends are a position where a fuel passage 1a extends. Has been cut off with. 2, 3, 4, and 5 are cross-sectional views taken along lines AA, BB, CC, and DD of FIG. 1, respectively. As shown in these drawings, the fuel passage 1a extends over the entire length of the fuel distribution pipe 1, one end thereof is closed by a stopper member 3 having an air bleeding structure, and the other end thereof is a fuel pump. Etc. is connected to the fuel pressure feeding means. On the lower surface of the fuel distribution pipe 1 in the drawing, an injection valve connector 1b for attaching the fuel injection valve 4 so that its fuel inlet port and the fuel passage 1a communicate with each other is formed. Further, on the upper surface of the fuel distribution pipe 1 in the drawing,
A centralized connector 1c is formed for electrical connection to a control device (not shown).

The bus bar 2 as an energizing line to each fuel injection valve 4 has a plus electrode 2a for guiding the plus electrode of each fuel injection valve 4 to the centralized connector 1c and a minus electrode of each fuel injection valve 4. Commonized centralized connector 1
2b for the negative electrode for leading to c. As shown in FIGS. 1 and 5, each bus bar 2 is adapted to project to a predetermined position within the centralized connector 1c. Further, as shown in FIG. 2, each injection valve connector 1b
At the two electrodes of the fuel injection valve 4 and the two kinds of bus bars 2
A leaf spring type intermediate terminal 5 is used for electrical connection with a and 2b, and this electrical connection is achieved at the same time when the fuel injection valve 4 is attached to the injection valve connector 1b. Accordingly, by connecting the wiring connector on the control device side and the centralized connector 1c, each fuel injection valve 4 and the control device are easily electrically connected, and the on-off valve control of the fuel injection valve 4 by the control device is performed. It will be possible. further,
As shown in FIG. 4, the fuel distribution pipe 1 is provided with a fixing metal collar 6 at a predetermined position.

The conventional resin fuel distribution pipe is the bus bar 2,
The intermediate terminal 5 and the fixing metal collar 6 are simultaneously installed in a predetermined position of the product mold and resin is press-fitted and molded. First, the resin fuel distribution pipe 1 in the first embodiment of the present invention is The first resin portion shown by 10 in FIGS. 2 to 5 is molded by a mold for it.

As shown in FIGS. 2 to 5, the first resin portion 10 connects the bus bars 2a and 2b and the intermediate terminal 5 with each other.
In order to be able to support it in place with respect to the product mold without using the conventionally required set pin,
A groove portion 10a into which each bus bar 2a, 2b can be fitted,
A hole 10b into which each intermediate terminal 5 can be inserted is formed.

After the bus bars 2a, 2b and the intermediate terminals 5 are attached to the first resin portion 10 thus molded, they are set in a product mold, and the second resin portion 20 is molded by the product mold. It is supposed to be implemented. Since the resin fuel distribution pipe 1 molded in this way does not require a set pin for supporting each bus bar 2a, 2b at a predetermined position in the product mold, when the set pin is removed from the molded product. The holes of the parts remain, and it is completely prevented that the filling of the putty or the like is not completely watertight and that water invades to short-circuit the busbars or corrode the busbars.

Further, as compared with the support by the set pin, the support of each bus bar 2a, 2b is made firmer by the groove portion 10a, and even when the second resin portion 20 is molded, the resin is pressed into the product mold. Bus bar 2
a and 2b are not deformed, and the first resin portion 1
The airtightness of the fuel passage 1a, which is guaranteed at the time of molding 0, is maintained, and the bus bars 2a, 2
The insulation between b is guaranteed.

6 to 9 are sectional views corresponding to FIGS. 2 to 5 showing a second embodiment of the present invention. Only the differences from the first embodiment will be described below. The first resin portion 10 'in the resin fuel distribution pipe of the present embodiment is provided with each bus bar 2a, 2a.
It is a portion around b, and is molded by a mold for it so that it does not interfere with the fuel passage 1a and can support each bus bar in a predetermined position in the product mold.

On the other hand, after the first resin portion 10 'thus molded is set in a product mold, the second resin portion is molded by resin.
The resin portion 20 'includes the fuel passage 1a. When molding the first resin portion 10 ', the bus bars 2a and 2b are formed.
Requires a set pin for setting in a mold for that, and the first resin portion 10 'after molding has a hole portion 10' when the set pin as shown in FIGS. 7 to 9 is removed. Although c remains, such a hole 10'c is completely filled with the resin during the molding of the second resin portion, and the problem of water intrusion does not occur.

In the resin fuel distribution pipe of this embodiment, the insulation between the bus bars 2a and 2b is guaranteed by the first resin portion 10 ', and at the time of molding the second resin portion 20', the bus bars 2a and 2b. Is firmly supported at a predetermined position in the product mold by the first resin portion 10 ', so that even if the resin is pressed in, it deforms to contact the core of the product mold for forming the fuel passage 1a. Therefore, the airtightness of the fuel passage 1a is guaranteed.

According to the first and second embodiments, since each bus bar 2a, 2b is set on the first resin portion 10, 10 'and then arranged at a predetermined position in the product mold, it is conventionally used. Since the positioning of each bus bar on the product mold, which has been relatively difficult, can be made very simple, this working time can be considerably shortened. Further, the conventional resin fuel distribution pipe was subjected to the airtightness test of the fuel passage and the continuity test of each bus bar after the completion of molding, and if any one of them was defective, it was discarded. Two
The resin fuel distribution pipe of the embodiment has the first resin portion 10, 1
At the stage of 0 ', if the airtightness test or the continuity test is performed and a defect is found, the second resin part is set to 2
It is not necessary to mold 0, 20 ', and the material cost of the fuel distribution pipe that is discarded due to a defect can be reduced.

In addition, in the first embodiment, each bus bar 2
After fitting a and 2b into the groove portion 10a of the first resin portion 10, the groove portion 10a of the first resin portion 10 is heated and slightly melted by ultrasonic waves, and is hardened again to be hardened again.
It is also possible to perform heat staking to firmly fix a and 2b to the first resin member 10. In such heat caulking, instead of heating by ultrasonic waves, each bus bar 2a,
It is also possible to energize and heat 2b.

In both embodiments, the first resin portion 10, 1
By using the same material for 0'and the second resin portion 20, 20 ', the coefficient of thermal expansion becomes the same, and the first and second resin portions are resistant to temperature changes during use of this resin fuel distribution pipe. It is prevented that the thermal expansion and contraction amounts of the two become equal and the thermal stress is generated. Of course, even if not the same material, if both materials have substantially the same thermal expansion coefficient, this effect can be obtained.

In order to ensure the bonding between the first resin portion 10 and 10 'and the second resin portion 20 and 20', the surface of the first resin portion is melted when the second resin portion is molded. It is preferable that the two are fused together.
It is preferable that the material of the resin portion has a higher melting point than the material of the first resin portion. Examples of such combinations having substantially the same coefficient of thermal expansion include glass fiber reinforced 66 polyamide resin (melting point 265 ° C) and glass fiber reinforced 6 polyamide resin (melting point 225 ° C), or PP.
Examples include S resin (melting point 278 ° C) and glass fiber reinforced 66 polyamide resin (melting point 265 ° C). When the same material is used, the temperature of the liquid resin is raised above the melting point to mold the second resin portion, whereby the surface of the first resin portion is melted and the fusion of the two can be ensured.

The above-mentioned PPS resin is particularly suitable as a material for forming the resinous fuel distribution pipe because it has self-extinguishing property. Further, the glass fiber reinforced phenol resin has thermosetting property and is made of glass fiber. Reinforced polyimide resins have a very high heat distortion temperature (300 ° C. or higher), and therefore they are also particularly suitable as a material for forming the resinous fuel distribution pipe.

FIG. 10 is an enlarged view of a portion E of FIG. 3, in which a concavo-convex portion is formed on the joint surface between the first resin portion and the second resin portion. By forming the concavo-convex portion in this manner, the joint area between the two is increased, and at the time of molding the second resin portion, the concavo-convex portion of the first resin portion contacts the molten resin with a large surface area, so that it is ensured. Since they are melted and fused, the joint strength between them can be considerably improved. Figure 10
As shown in FIG. 5, by making such an uneven portion into a sawtooth shape with an acute angle, the surface area thereof becomes considerably large, and this effect can be made more remarkable.

The respective resins mixed with the glass reinforcing fibers as described above have an improved heat resistance due to the high melting point of the glass reinforcing fibers themselves, and the tensile strength and compression strength in the axial direction thereof are improved by the glass reinforcing fibers. To do. In order to effectively utilize this strength improvement, it is necessary to orient the glass reinforcing fibers in the longitudinal direction of the resin fuel distribution pipe. Since the glass-reinforced fiber is usually a wire rod having a diameter of several microns and a length of several tens to hundreds of microns, the axis direction of the liquid resin and the flow direction of the liquid resin are aligned during molding with the liquid resin. . Therefore, by arranging the resin injection port in the mold on the end side of the fuel distribution pipe so that the liquid resin flows in the longitudinal direction of the fuel distribution pipe, all of the glass-reinforced fibers are separated from the resin fuel after molding. The strength of the resin fuel distribution pipe which is oriented in the longitudinal direction of the pipe and is structurally weak in this direction can be considerably improved. Further, in the injection valve connector 1b portion of the resin fuel distribution pipe 1 shown in FIG. 1, the flow direction of the liquid resin at the time of molding is the extending direction of the injection valve connector, and therefore the glass reinforced fiber has this direction. And the strength of the injection valve connector 1b against bending is improved.

Further, the thermal expansion coefficient of the resin is very large, about three times as large as that of aluminum or the like forming the intake manifold to which the resin fuel distribution pipe is attached, but the thermal expansion coefficient of the glass reinforced fiber is aluminum or the like. Therefore, by orienting in the longitudinal direction of the resin fuel distribution pipe in this way, the thermal expansion coefficient of the resin fuel distribution pipe can be made smaller than that of resin, and the resin fuel distribution pipe can be used at the time of use. The thermal stress generated in the pipe can be significantly reduced. Similar effects can be obtained by using not only glass fibers but also carbon fibers or fiskers as the reinforcing fibers.

[0035]

As described above, according to the resin fuel distribution pipe of the present invention as set forth in claim 1, the first resin portion is molded in advance so that the energization line is located at a predetermined position in the product mold. In order to firmly support, the set pin is not required, the hole for communicating the energizing line with the outside is not formed, and the energizing line is deformed during the molding of the second resin portion, so that the energizing line is in contact with each other. It is possible to prevent the occurrence of insulation failure and the loss of airtightness of the fuel passage due to contact with the mold core for forming the fuel passage.

According to the resin fuel distribution pipe of the present invention as set forth in claim 2, since the fuel passage is already formed in the first resin portion, when the second resin portion is molded,
A hardened resin layer exists between the current-carrying line and the fuel passage to ensure the airtightness of the fuel passage.

According to the resin fuel distribution pipe of the present invention as defined in claim 3, the first resin portion firmly supports the current-carrying line at a predetermined position in the product mold. It is reliably prevented that the energizing lines are deformed and come into contact with each other when the resin portion is molded.

According to the resin fuel distribution pipe of the present invention as defined in claim 4, the resin forming the first resin portion and the resin forming the second resin portion have substantially the same coefficient of thermal expansion. Therefore, the thermal expansion and contraction amounts of the first resin portion and the second resin portion are almost equal to the temperature change during use of the resin fuel distribution pipe, and thermal stress is prevented from occurring. The life is not reduced as compared with the conventional one.

According to the resin fuel distribution pipe of the present invention as defined in claim 5, since the melting point of the resin forming the first resin portion is lower than the melting point of the resin forming the second resin portion, During the molding of the second resin portion, the surface of the first resin portion is melted, and the two can be reliably fused to each other to have a very large joint strength, and the strength is not reduced as compared with the conventional case.

Further, according to the resin fuel distribution pipe of the present invention as defined in claim 6, since the joint surface between the first resin portion and the second resin portion is provided with an uneven portion, both of them are provided. As the joint area increases, fusion easily occurs, the joint strength can be considerably improved, and the strength is not reduced as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a resin fuel distribution pipe according to the present invention.

FIG. 2 is an AA enlarged cross-sectional view of FIG. 1 showing a first embodiment of the present invention.

FIG. 3 is a BB enlarged cross-sectional view of FIG. 1 showing a first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view taken along line CC of FIG. 1 showing the first embodiment of the present invention.

5 is an enlarged cross-sectional view taken along line DD of FIG. 1 showing the first embodiment of the present invention.

FIG. 6 is a sectional view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 7 is a sectional view corresponding to FIG. 3 showing a second embodiment of the present invention.

FIG. 8 is a sectional view corresponding to FIG. 4 showing a second embodiment of the present invention.

FIG. 9 is a sectional view corresponding to FIG. 5 showing a second embodiment of the present invention.

10 is an enlarged view of a portion E in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin fuel distribution pipe 1a ... Fuel passage 1b ... Injection valve connector 1c ... Concentrated connector 2 ... Bus bar 2a ... Positive electrode bus bar 2b ... Minus electrode bus bar 4 ... Fuel injection valve 5 ... Intermediate terminal 10, 10 '... First resin portion 20, 20 '... Second resin portion

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takeomi Yamamoto 10 Hamadashita, Nakahata-cho, Nishio-shi, Aichi Stock company Otix

Claims (6)

[Claims] 1. A fuel passage extending in a longitudinal direction of a fuel distribution pipe and communicating with each fuel injection valve, an energization line to each of the fuel injection valves, and the energization line being a predetermined position in a product mold. A fuel made of resin, comprising: a first resin portion preformed so as to firmly support the first resin portion, and a second resin portion formed between the first resin portion and the product mold. Distribution pipe. 2. The resin fuel distribution pipe according to claim 1, wherein the fuel passage is formed in the first resin portion. 3. The resin fuel distribution pipe according to claim 1, wherein the fuel passage is formed in the second resin portion. 4. The resin according to claim 1, wherein the resin forming the first resin portion and the resin forming the second resin portion have substantially the same thermal expansion coefficient. Fuel distribution pipe. 5. The resin fuel distribution pipe according to claim 1, wherein the melting point of the resin forming the first resin portion is lower than the melting point of the resin forming the second resin portion. 6. The resin fuel distribution pipe according to claim 1, wherein an uneven portion is provided on a joint surface between the first resin portion and the second resin portion.