JPH09250420A - Lead wire laying device for fuel distributing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent short-circuiting at lead wire crossing portions without using separate parts for insulation in a fuel distributing pipe in which a plurality of lead wires are embedded vertically and horizontally. SOLUTION: Grooves 20 and projections 21 for positioning lead wires 8D, 8E in a pipe radial direction are formed at one surface of a holder 17, which is long in a pipe axial direction and is made of an insulating material. Grooves for positioning other lead wires 8A, 8B, 8C in the pipe axial direction are formed at the other surface of the holder 17. The lead wires 8A-8E are fitted into the grooves, and their crossing portions are insulated via a part of the holder 17. The lead wires 8A-8E are irremovably fitted inside the grooves 20 at spot-welded points 22. Both surfaces of the holder 17 are covered with insulating films, parts of which close the grooves 20, thereby preventing any deformation of the lead wires 8A-8E due to an injection pressure at the time of insert molding.

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 used for a fuel injection device of an internal combustion engine, and a device for wiring a lead wire inside a pipe body.

[0002]

2. Description of the Related Art For example, in an in-line four-cylinder internal combustion engine of an automobile, a fuel distribution pipe 31 as shown in FIG. 12 has been conventionally used. The fuel distribution pipe 31 is integrally formed of a resin material from a pipe body 32 connected to a fuel tank (not shown) and four injector attachment portions 33 to which injectors (fuel injection valves, not shown) are attached. . An input side connector 34 is formed on the upper surface of the pipe body 32, and an output side connector 35 is provided on the lower surface of each injector mounting portion 33.

Inside the tube body 32, five lead wires 36 for supplying a control current to the injector are embedded vertically and horizontally. A conventional lead wire wiring device 37 is provided with a resin holder 38 that is long in the tube axis direction, and one groove of the holder 38 is formed with five grooves 39 for positioning the lead wires 36 at predetermined intervals. In addition, at two points where the lead wire 36 in the pipe axis direction and the lead wire 36 in the pipe diameter direction intersect, an insulating tip 40 is inserted between the lead wires 36 to prevent short-circuiting at the intersection. It was

[0004]

However, according to the conventional lead wire wiring device 37, it is necessary to insert two small insulating chips 40, which are separate parts, in order to insulate the intersection, and the assembling work is therefore performed. Not only is it troublesome,
There is a problem in that the insulating chip 40 is easily displaced during transportation and the possibility of defective insulation is increased.

Therefore, an object of the present invention is to provide a lead wire wiring device for a fuel distribution pipe which can reliably prevent a short circuit at a lead wire intersection without using a separate component.

[0006]

In order to solve the above-mentioned problems, a lead wire wiring device according to the invention of claim 1 is provided with an input side connector and a plurality of output side connectors in a tube body, and each connector. In a fuel distribution pipe in which multiple lead wires are embedded vertically and horizontally between the holders, a holder made of an insulating material that is long in the pipe axis direction is provided, and one side surface of the holder holds the lead wire in the pipe radial direction. And a holding portion for holding a lead wire in the tube axis direction is provided on the surface opposite to the holder, and a crossing portion of each lead wire is insulated by a part of the holder.

Further, the lead wire wiring device according to the invention of claim 2 is configured by providing each holding portion with a groove for positioning the lead wire and a means for fixing the lead wire in the groove. Examples of the fixing means include means for spot-welding the lead wire and the holder, a projection for forcibly fitting the lead wire into the groove, or a means such as a claw for locking the lead wire at several places. it can. Also, when insert-molding the lead wire into the tube body, make sure that the lead wire does not deform and rise from the groove.
It is also possible to adopt a means in which an insulating film such as a resin is provided on both surfaces of the holder and the groove is filled with a part of the insulating film.

According to the third aspect of the present invention, there is provided a lead wire wiring device in which a plurality of lead wires in the pipe radial direction are integrally connected by a disconnectable short-circuit portion to form a plurality of lead wires in the pipe axial direction. It is configured to be integrally connected by a separable short-circuit portion. The short circuit portion is cut after the lead wires are held in the holder, so that the lead wires are electrically separated from each other.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in a fuel distribution pipe used in an in-line four-cylinder internal combustion engine of an automobile will be described with reference to the drawings. 1 to 3 show the overall structure of the fuel distribution pipe. The fuel distribution pipe 1 of the present embodiment includes a pipe body 2 connected to a fuel tank and four injector attachment portions 3 to which injectors are attached.
Therefore, it is integrally molded with a resin material. A fuel passage 4 having a closed tip is formed in the pipe body 2, and a branch hole 5 is formed in the injector mounting portion 3 so as to communicate with the fuel passage 4 at a substantially right angle.

An input side connector 6 connected to the electronic control unit is provided in the central portion of the pipe body 2, and an output side connector 7 connected to the injector is connected to the input side connector 6 in each injector mounting portion 3. Are provided in the opposite direction.
Inside the tube body 2, a control current is passed through the injector 5
The lead wires 8A, 8B, 8C, 8D, 8E are vertically and horizontally embedded by the insert molding method so as to extend between the connectors 6 and 7. An input terminal 9 exposed in the input side connector 6 and an output terminal 10 exposed in the output side connector 7 are provided at both ends of the lead wires 8A to 8E. Note that 8A is a negative electrode lead wire common to all injectors, and 8B, 8C, 8D, and 8E are positive electrode lead wires independent for each injector.

FIG. 4 shows the shape of the lead wires 8A to 8E when they are manufactured. The five lead wires 8A to 8E are three lead wires 8A, 8B, 8C extending in the tube axis direction so that they can be easily handled during wiring and insert molding.
And two lead wires 8D and 8E extending in the pipe radial direction.
It is divided and pressed. Lead wire 8 in the tube axis direction
A, 8B, 8C are integrally connected by the short-circuited portions 11 at both ends, and the lead wires 8D, 8E in the pipe radial direction are short-circuited portion 12 at one end.
Are connected together by Since the short-circuit parts 11 and 12 are located outside the mold, they are not embedded in the resin material. Therefore, even after the resin molding, the separation portion 13 having a narrow and thin wall
The cut-off portion 13 connected to the lead wires 8A to 8E via the can be easily cut off by bending. In addition, a bridge portion 14 that crosses the lead wires 8A, 8B, and 8C in the tube axis direction is formed by bending the lead wires 8D and 8E in the tube diameter direction.

5 to 11 show a lead wire wiring device. The wiring device 16 of the present embodiment includes a holder 17 made of a resin plate that is long in the tube axis direction. As shown in FIGS. 5 to 7, on one surface (hereinafter, referred to as a surface for convenience) of one side of the holder 17, two grooves 20 as a holding portion into which the lead wires 8D and 8E in the pipe radial direction are fitted. Are formed. The pipe radial direction portion of the groove 20 is the bridge portion 14 of the lead wires 8D and 8E.
It is formed by a pair of protrusions 21 projectingly provided on the holder 17 so as to sandwich. The lead wires 8D and 8E are positioned in the pipe axial direction and the pipe radial direction by the groove 20 and the protrusion 21, and are fixed in the groove 20 in a non-detachable manner at a plurality of spot welding points 22 by an ultrasonic welding machine or the like. Has been done.

As shown in FIGS. 8 to 11, a surface (oppositely referred to as a back surface) on the opposite side of the holder 17 serves as a holding portion into which the lead wires 8A, 8B, 8C in the tube axis direction are fitted. Three grooves 18 are formed. Lead wires 8A, 8B,
8C is positioned in the pipe axis direction and the pipe radial direction by the groove 18, and the groove 8 is formed at the plurality of spot welding points 19.
Is fixed inside. And the lead wire 8 in the pipe radial direction
By separately holding D, 8E and the lead wires 8A, 8B, 8C in the tube axis direction on the front surface and the back surface of the holder 17, the intersections of the lead wires 8A to 8E are insulated by a part of the holder 17. There is.

The front and back surfaces of the holder 17 are coated with resinous insulating films 23 and 24 (see FIG. 3), and a part of them is filled in the grooves 18 and 20. A plurality of ribs 25 are formed on both front and back surfaces of the holder 17 so as to extend in the tube axis direction for preventing the holder 17 from being deformed. Also,
On the surface of the holder 17, a large number of leg portions 26 (FIGS. 5 and 7) for supporting the holder 17 at predetermined positions of an injection mold (not shown).
Etc.) are provided.

Next, a method of manufacturing the fuel distribution pipe 1 configured as described above will be described. First, in the lead wire manufacturing process, one metal plate is punched by a press, and five lead wires 8A to 8E are connected to the lead wires 8A, 8B and 8C in the tube axis direction and the tube as shown in FIG. Radial lead wire 8
D and 8E are divided into two and press-molded.

Next, in the wiring step, as shown in FIG. 5, the lead wires 8D and 8E in the pipe radial direction are mounted in the grooves 20 on the surface of the holder 17, and as shown in FIG. The wires 8A, 8B, 8C are mounted in the groove 18 on the back surface of the holder 17. Thereby, the lead wires 8A to 8E
As shown in FIG. 7, the intersecting part of is insulated by utilizing a part of the holder 17. Therefore, unlike the prior art, there is no need to use a separate component for insulation, there is no risk of it shifting during transportation, and the crossing portion can be reliably insulated by an extremely simple operation. Moreover, since two sets of lead wires that intersect each other are preliminarily integrated at the short-circuit portions 11 and 12, respectively, 3
The book or two can be easily attached to the holder 17 together.

In this mounted state, next, each lead wire 8A-
After 8E is fixed in the grooves 20 and 18 by spot welding, insulating films 23 and 24 are provided on both front and back surfaces of the holder 17, as shown in FIG.
8 is filled. As a result, the lead wires 8A to
It is possible to reliably prevent the defect that 8E is separated from the grooves 20 and 18 and that the lead wires 8A to 8E are deformed by the injection pressure during insert molding. The short-circuited parts 11, 1
2 is cut from the lead wires 8A to 8E after spot welding, and the lead wires 8A to 8E are electrically separated from each other.

Subsequently, in the insert molding step, the holder 17 to which the lead wires 8A to 8E are attached is set at a predetermined position of the injection molding die. Then, at the same time when the pipe body 2 and the injector mounting portion 3 are injection molded with a resin material,
The lead wires 8A to 8E and the holder 17 are embedded in the tube body 2. At this time, since the lead wires 8A to 8E are firmly held by the grooves 20 and 18 of the holder 17 over the entire length at predetermined intervals, the lead wires 8A to 8E are pressed by the pressure of the resin material.
E There is no risk of mutual contact, it is possible to reliably prevent short-circuiting of each part, and suppress the generation of defective products.

The present invention is not limited to the above-described embodiment, but may be embodied with various modifications as appropriate without departing from the spirit of the invention as follows. (1) A plurality of pins serving as holding portions may be provided on both surfaces of the holder so as to hold the lead wires sandwiched between the pins. (2) An adhesive may be used as the fixing means, and the lead wire may be fixed in the groove with the adhesive. (3) Not limited to fuel distribution pipes for in-line 4-cylinder internal combustion engines, 2
It is also applicable to fuel distribution pipes with built-in lead wires for various internal combustion engines of 12 cylinders or more. (4) The positive electrode and the negative electrode of the lead wire may be reversed.

[0020]

As described above in detail, according to the first aspect of the present invention, since the crossing portion of the lead wire is insulated by a part of the holder, short-circuiting of the lead wire crossing portion can be achieved without using a separate component. It can be prevented easily and surely.

In addition to the above effects, according to the invention of claim 2, since the lead wire is positioned and fixed in the groove, it is possible to reliably prevent the lead wire from being separated and deformed.

According to the third aspect of the present invention, the two sets of lead wires that intersect each other are integrally connected by the short-circuited portion, so that a plurality of wires can be easily attached to the holder at once.

[Brief description of drawings]

FIG. 1 is a front view showing a fuel distribution pipe according to an embodiment of the present invention.

FIG. 2 is a plan view of the fuel distribution pipe.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view showing a lead wire of the fuel distribution pipe.

FIG. 5 is a front view showing a lead wire wiring device for the fuel distribution pipe.

FIG. 6 is a front view showing a holder of the wiring device.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 5;

FIG. 8 is a rear view of the wiring device.

FIG. 9 is a rear view showing a holder of the wiring device.

10 is a cross-sectional view taken along line XX of FIG.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 8;

FIG. 12 is a front view showing a conventional lead wire wiring device for a fuel distribution pipe.

[Explanation of symbols]

 1 Fuel distribution pipe 2 Pipe body 3 Injector mounting part 6 Input side connector 7 Output side connector 8A to 8C Pipe axis direction lead wire 8D, 8E Pipe diameter direction lead wire 11, 12 Short circuit part 13 Separation part 16 Lead wire wiring Device 17 Holder 18, 20 Groove 19, 22 Spot welding location 23, 24 Insulating film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Kojima 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd.

Claims (3)

[Claims] 1. A fuel distribution pipe in which an input side connector and a plurality of output side connectors are provided in a pipe body, and a plurality of lead wires are vertically and horizontally embedded between the connectors,
A holder made of an insulating material that is long in the pipe axis direction is provided, and a holding portion that holds the lead wire in the pipe diameter direction is provided on one surface of the holder, and a lead wire in the pipe axis direction is held on the opposite surface of the holder. A lead wire wiring device for a fuel distribution pipe, in which a holding portion is provided and the intersection of each lead wire is insulated by a part of the holder. 2. The holding portion is provided with a groove for positioning the lead wire and a means for fixing the lead wire in the groove.
Lead wire wiring device for the described fuel distribution pipe. 3. A plurality of lead wires in the pipe radial direction are integrally connected by a separable short-circuit portion, and a plurality of lead wires in the pipe axial direction are integrally connected by a separable short-circuit portion. 1
Lead wire wiring device for the described fuel distribution pipe.