JPH09153687A - Wire harness and method of connecting electric wires of the harness to printed circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly connect electric wires to a printed circuit board provided in an electric connection box by a low cost structure. SOLUTION: Onto a printed circuit board 15 a wire holding member composed of a holding member body 16, retainers 18, etc., is fixed to hold electric wires 10. In this condition the ends of the wires 10 are directly connected by solder, etc., to appropriate points of conductors 38 laid on the board 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness in which an electric wire is connected to a printed circuit board provided in an electric connection box and a method for the connection.

[0002]

2. Description of the Related Art Generally, a wire harness comprises a wire bundle 80 as shown in FIG. 7 and an electric connection box 90. The electric wire bundle 80 is a bundle of a plurality of electric wires 10 and their terminals are connected to a common connector 70. Each electric wire 10 is connected to the electric connection box 90 via the connector 70. It has become.

Conventionally, the internal circuit of the electric junction box 90 is
A bus bar made by punching a thin iron plate into the desired circuit shape,
A so-called I in which electric wires are arranged in a desired circuit shape on a resin plate
It is configured by stacking P boards in multiple layers, and the connector 70 is mounted on these bus bars and IP boards to connect the electric connection box 90 and each electric wire 10, but such a laminated body However, it is difficult to reduce the size of the electric connection box 90, and there is a disadvantage that the electric connection box 90 becomes significantly large as the internal circuit becomes complicated.

Therefore, in recent years, miniaturization of the electric junction box 90,
A printed circuit board has been attracting attention as a means for achieving high density. In this printed circuit board, a conductor made of copper foil or the like is integrated on the surface of a substrate body made of an insulating material, and the end of the electric wire is connected to this conductor.

8A and 8B show a printed circuit board 1
5 shows a conventional example of the connection structure between the wire 5 and the electric wire 10. In the figure, a resin-made terminal block 92 and a terminal 94 penetrating vertically are integrally molded, and the terminal block 92 is fixed on the printed circuit board 15 by screws 93, and 94
Has a lower end portion that penetrates the conductor portion of the printed circuit board 15 and is connected to the conductor portion by soldering. By connecting the terminal of the connector 80 to the terminal 94, the conductor portion of the printed circuit board 15 and the electric wire 10 are connected via both terminals.

According to this structure, the terminal 94 and the terminal block 92 are integrally molded so as to be fixed to each other, so that even if a tensile force acts on the electric wire 10, this tensile force is directly applied. It does not act on the soldered portion 96, and due to this tensile force the soldered portion 96
It is possible to prevent cracks and the like from being generated in advance.

[0007]

8 (a) and 8 (b) described above.
In the structure shown in (1), since the end of the electric wire 10 and the conductor portion of the printed circuit board 15 are indirectly connected via the connector 80, reliability is improved as compared with the case where the end of the electric wire 10 is directly connected to the conductor portion. Poor. Also, the connector 80
Is a structure with a large number of parts in which a connector terminal and a connector housing are combined, and moreover, since the connector housing has a complicated shape with a lance for fixing the terminal, the use of this connector 80 significantly increases the cost. Get higher

As means for solving such inconveniences,
There is a method of directly connecting the end of the electric wire 10 to the conductor portion of the printed circuit board 15 by soldering. However, if the electric wire 10 is simply connected directly, this tensile force is directly applied to the solder when the tensile force acts on the electric wire 10. It takes a part to attach,
There is a risk of causing cracks and the like in the relevant part.

In view of such circumstances, it is an object of the present invention to reliably connect the printed circuit board and the end of the electric wire with a simple structure in a wire harness in which the printed circuit board is provided in the electrical connection box. To do.

[0010]

Means for Solving the Problems As a means for solving the above problems, the present invention relates to a wire harness in which an end of an electric wire is connected to a printed circuit board provided in an electric connection box, The electric wire holding member is fixed, and the end of the electric wire is directly connected to the conductor portion of the printed circuit board while the electric wire holding member holds the portion of the electric wire on the front side of the end.

According to this structure, since the electric wire end and the conductor portion of the printed circuit board are directly connected to each other, the reliability is higher than that in the case where a connector is interposed therebetween, and the connector is unnecessary. The cost will be lower. Moreover, since the portion of the electric wire on the front side of the terminal is held by the electric wire holding member fixed to the printed circuit board side, even if a tensile force is applied to the electric wire, this acting force remains as it is. It is possible to prevent this from happening.

Further, when a plurality of electric wires are held in parallel in the electric wire holding member, if the portions of the respective electric wires on the front side of the terminals are connected by a connecting member, the electric wires can be connected to each other by the connection. Since the displacement is regulated, the strength load on the connecting portion between each electric wire and the conductor portion of the printed circuit board is further reduced.

The electric wire holding member has an electric wire groove into which the electric wire is fitted and is fixed to the printed circuit board, and a holding member main body with the electric wire fitted into the electric wire groove. It is preferable that it is mounted and provided with a pressing member that presses the electric wire in this mounted state. According to this configuration, the electric wire can be held only by fitting the electric wire into the electric wire groove of the holding member main body and mounting the pressing member on the holding member main body.

More specifically, a recess may be formed in the middle of the wire groove, and a pressing member may be configured to press the middle part of the wire into the recess in a bent state. While connecting portions on the front side with respect to each other with a connecting member, a plurality of electric wire grooves and a connecting member groove extending in a direction orthogonal to the electric wire grooves and into which the connecting member is fitted are formed in the holding member main body. However, the connecting member fitted in the connecting member groove may be pressed. In either case, the displacement of the electric wire in the axial direction is reliably regulated by bending the electric wire in the recess and fitting the connecting member in the connecting member groove.

With respect to the direction of the electric wire groove, the direction may be substantially perpendicular to the printed circuit board and the electric wire may be directed straight to the printed circuit board. The direction of the electric wire is set to be substantially parallel to the printed circuit board, and the end of the electric wire is connected to the conductor portion of the printed circuit board in a state where the electric wire is bent toward the printed circuit board in the region between the electric wire groove and the printed circuit board. By doing so, slack can be given to the electric wire at the bent portion, and by absorbing the external force at the slack portion, the strength load on the connection portion can be further reduced.

Regarding the width dimension of the electric wire groove, by setting the width dimension to be smaller than the electric wire diameter,
Although the wire can be securely held, it is more preferable that the wire groove on the side closer to the wire end in the wire groove is set to have a width larger than the wire diameter to allow the wire to be slightly displaced. This makes it possible to more smoothly perform the work of connecting the wire end and the conductor portion of the printed circuit board.

As a procedure for making the above-mentioned connection, first, an electric wire holding member is fixed to the printed circuit board, the electric wire holding member is made to hold a portion of the electric wire on the front side of the end, and then the electric wire holding member is held. The terminal may be directly connected to the conductor portion of the printed circuit board.

Here, when connecting a plurality of electric wires, these electric wires are mutually connected in parallel in advance, and these electric wires are collectively set in the electric wire holding member, whereby each electric wire is connected. The work can be performed with higher efficiency than in the case where the terminals are individually connected to the conductor portion of the printed circuit board.

[0019]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. Here, an example in which the three electric wires 10 are connected to the printed circuit board 15 in the electric junction box is shown, but the number of electric wires is not particularly limited in the present invention.

Each of the electric wires 10 is an insulated electric wire in which an insulator 12 is arranged around a conductor 11. The end portions of the electric wires 10 are peeled off, and the portions on the front side thereof are connected by a connecting tape (connecting member) 14. By being connected, they are interconnected. The connecting tape 14 is made of a thermoplastic resin,
It is welded to the surface of the insulator 12 of each electric wire 10.

A holding member body 16 and a holding member 18 are provided as electric wire holding members for holding these electric wires 10, both of which are made of an insulating material such as synthetic resin.

The holding member body 16 is fixed at a predetermined position on the printed circuit board 15. For more information,
Through holes 15a are provided at appropriate positions on the printed circuit board 15. The screws 40 are inserted into the through holes 15a, and the holding member main body 16 is screwed onto the printed circuit board 15 by these screws 40.

On the upper surface of the holding member body 16, each electric wire 10 is
Corresponding to the front side wire groove (wire groove near the wire end) 2
1 and rear side wire groove (wire groove on the side far from the wire end) 22
Is formed, and is located at a position between the front electric wire groove 21 and the rear electric wire groove 22 in a direction orthogonal to the electric wire grooves 21 and 22 (see FIG.
A concave portion 26 extending in the (a) depth direction is formed.

The wire grooves 21 and 22 are opened upward,
The electric wire 10 can be fitted from above, and guide taper surfaces 24 are formed on the upper edge portions of the electric wire grooves 21 and 22 for facilitating the fitting. Although the width d ₁ (FIG. 3A) of the front electric wire groove 21 is set to be smaller than the diameter of the electric wire 10, the electric wire 10 is press-fitted into the electric wire groove 21. On the other hand, the width dimension d ₂ of the rear side electric wire groove 22 ((b) in the same figure) is
The diameter of the electric wire 10 is set larger than the diameter of the electric wire 10, and the electric wire 10 can be slightly displaced left and right in a state where the electric wire 10 is fitted in the electric wire groove 21.

The recess 26 traverses all the wire groove pairs 21 and 22 and is formed deeper than the wire grooves 21 and 22.

Locking projections 28 are formed on both side walls (left and right side walls in FIG. 2B) of the holding member body 16, and each locking projection 28 has a triangular shape in which the amount of projection increases downward. Has been formed. A positioning pin 30 is provided on the upper surface of the holding member body 16 so as to project upward.

On the other hand, the pressing member 18 has a shape that opens downward, specifically, a top wall 42, and a front wall 43 that projects downward from the front end of the top wall 42 (right end in FIG. 2A). , A rear wall 44 protruding downward from the rear end of the ceiling wall 42, and the ceiling wall 42
And left and right side walls 45 protruding downward from both left and right ends of the. Further, a pressing wall 46 is provided so as to project downward from an intermediate position in the front-rear direction on the lower surface of the top wall 42, and the pressing wall 46 is formed over the entire lateral direction of the pressing member 18.

A locking recess 48 having a shape corresponding to the locking projection 28 is formed on the inner surface of the lower end portion of each of the side walls 45, and the lower surface of the top wall 42 is positioned so that the positioning pin 30 can be fitted therein. A hole 50 is formed. Then, the locking projections 28 are fitted into the locking recesses 48 at the positions where the positioning pins 30 and the positioning holes 50 are fitted together, so that the holding member 18 is attached to the holding member body 16. In the mounted state, as shown in FIG. 2 (a), the pressing wall 46 is set to have a protruding dimension so that the pressing wall 46 pushes up to the bottom surface of the recess 26 while bending the middle portion of the electric wire 10. The front and rear walls 43,
These front and rear walls 4 are arranged so that the lower end surfaces of 44 almost contact each other.
A protrusion amount of 3,44 is set.

In the region closer to the terminal than the holding member body 16, each electric wire 10 is bent downward by approximately 90 °,
The conductor 11 of the terminal is directly connected by soldering to a suitable portion of the conductor portion 38 incorporated in the printed circuit board 15.

According to such a direct connection, it is possible to remarkably improve the connection reliability between the electric wire 10 and the conductor portion 38 with an inexpensive structure as compared with the conventional case where a connector is interposed. Moreover, the middle part of the electric wire 10 is pressed against the wall 4
Since the electric wire 10 is held immovably in the axial direction by pressing and bending it with 6, even if a tensile force acts on a portion of the electric wire 10 farther from the end than the holding portion, this tensile force Does not act on the soldered portion 39 as it is, and good connection can be maintained.

Further, in this structure, the pressing member 18 is
The front wall 43 and the rear wall 44 of the pressing member 18 restrict the upward movement of the electric wire 10 in a state in which the electric wire 10 is attached, and thus the fluttering of the electric wire 10 at this portion is restricted to obtain a more stable holding state. There is an advantage that can be.

The width d ₂ of the rear wire groove 22 is set smaller than the diameter of the wire 10, while the width d ₁ of the front wire groove 21 is set larger than the diameter of the wire 10. Therefore, while the press-fitting into the rear side electric wire groove 22 makes the electric wire 10 more firmly held, the front side electric wire groove 21 allows a slight displacement of the electric wire 10 in the left-right direction, thereby making a terminal connection work. Can be carried out more smoothly.

The connection by this structure can be easily performed by the following procedure, for example.

The holding member body 16 is fixed at a predetermined position on the printed circuit board 15.

The ends of each of the electric wires 10 are subjected to a peeling process to expose the conductors 11, and in a state where the electric wires 10 are arranged in a flat shape, the portions on the front side of the terminals are connected by a connecting tape 14.

Holding member body 1 in which all electric wires 10 are collected together
6 is fitted into each of the electric wire grooves 21 and 22.

A holding member 18 is attached to the holding member body 16.
By mounting the pressing wall 46 of the pressing member 18,
Then, the electric wire 10 is pushed into the recess 26 in a bent state (that is, the electric wire 10 is held immovably in the axial direction).

In each electric wire 10, the holding member main body 16
The portion between the terminal and the terminal is bent at about 90 ° to bring the terminal into contact with the conductor portion 38 of the printed circuit board 15 at an appropriate position, and the connection is made by soldering at the contact portion.

Next, the second embodiment will be described with reference to FIGS.
Description will be made based on (c).

Here, in the holding member main body 16 shown in FIGS. 1 to 3, a connecting tape groove (connecting member groove) having a width dimension slightly larger than the width dimension of the connecting tape 14 in place of the recess 26 is provided. 52 is formed, and the connecting tape 14 for connecting the electric wires 10 to each other is formed in the connecting tape groove 52.
Is inserted into the holding member main body 1 in this state.
By being mounted on the holding member 6, the holding wall 46 of the holding member 18 presses the connecting tape 14 from above. Further, guide taper surfaces 54 for facilitating the fitting of the connecting tape 14 are formed on both upper edges of the connecting tape groove 52.

Even in such a structure, by fitting the connecting tape 14 into the connecting tape groove 52, each electric wire 10 is
The axial movement of the can be regulated, and reliable holding can be performed.

The embodiment of the present invention is not limited to the above, and the following forms can be taken as an example.

(1) In the present invention, the means for fixing the holding member body 16 to the printed circuit board 15 is not particularly limited, and for example, as shown in FIGS.
A projection 58 is formed on the lower surface of the printed circuit board 15, the projection 58 is inserted into a through hole 56 provided in the printed circuit board 15, and ultrasonic welding is performed on the lower end of the projection 58 protruding from the lower surface of the printed circuit board 15. Alternatively, as shown in FIG. 6, a conical locked head portion 60 having a maximum diameter slightly larger than the hole diameter of the through hole 56 is formed at the lower end of the protrusion 58. The locked head portion 60 may be pressed into the through hole 56 until it reaches below the printed circuit board 15. Further, the lower surface of the holding member body 16 may be directly fixed to the upper surface of the printed circuit board 15 with an adhesive or the like.

(2) The means for holding the electric wire 10 on the electric wire holding member is not limited to the above, and for example, the surface of the insulator 12 of each electric wire 10 is directly attached to the surface of the electric wire holding member by using heat fusion or an adhesive. It may be fixed. However, in FIG.
According to the structure shown in FIG. 4, the electric wire 10 is inserted into the electric wire grooves 21 and 22, and then the holding member 1 is attached to the holding member main body 16.
There is an advantage that the holding state of the electric wire 10 can be obtained by a simple operation of mounting the electric wire 8.

(3) The connecting tape 14 may be omitted and each electric wire 10 may be individually set on a holding member.
However, if the electric wires are previously connected using the connecting tape 14, all the electric wires 10 can be collectively set on the electric wire holding member, and the working efficiency can be further improved, and the electric wires can be connected to each other by the connecting tape 14. By regulating the relative displacement (that is, by integrating all the electric wires 10), there is an advantage that effective reinforcement can be achieved.

(4) In FIG. 1 to FIG. 4, the electric wire grooves 21 and 22 are oriented in the horizontal direction which is parallel to the printed circuit board 15. However, the electric wire grooves 21 and 22 are orthogonal to the printed circuit board 15. The electric wires 10 may be directed straight from the electric wire grooves 21 and 22 to the printed circuit board 15 in the direction (the vertical direction in the illustrated example). However, if the electric wire grooves 21 and 22 are made horizontal as shown in FIGS. 1 to 4 and then the electric wire portions between the electric wire grooves 21 and 22 and the terminal are bent to make the connection, It is possible to make each electric wire 10 have a slack at this bent portion, and by absorbing the tensile force of the electric wire 10 by this slack, there is an advantage that it is possible to more reliably prevent the soldering portion 39 from being subjected to a strong load.

[0047]

As described above, according to the present invention, the electric wire holding member is fixed to the printed circuit board provided in the electric connection box of the wire harness, and the electric wire holding member fixes the portion of the electric wire on the front side of the terminal. Since the end of this electric wire is directly connected to the conductor part of the printed circuit board in a state of being held, the connection of the electric wire end and the conductor part of the printed circuit board is directly connected to increase the reliability of the connection, and also the connector. Is unnecessary to reduce the cost, and by holding the part of the wire closer to the front side than the end with the wire holding member fixed to the printed circuit board side, the tensile force acting on the wire is directly connected to the direct connection. There is an effect that it is possible to prevent it from being applied to a part and maintain a good connection state.

Here, when connecting a plurality of electric wires, by connecting the portions of the respective electric wires on the front side of the terminal with a connecting member, the electric wires are integrated and the relative displacement between the electric wires is regulated. It is possible and effective reinforcement can be done with a simple structure.

The electric wire holding member has an electric wire groove into which the electric wire is fitted and is fixed to the printed circuit board. A holding member main body is attached to the holding member main body with the electric wire fitted into the electric wire groove. According to the one including the pressing member that presses the electric wire in the mounted state, the electric wire is fitted into the electric wire groove of the holding member main body, and the pressing member is simply attached to the holding member main body. By the work, the effect of holding the electric wire can be obtained.

More specifically, a recess is formed in the electric wire groove, and a pressing member is configured to press the middle part of the electric wire into the recess in a bent state. While connecting the parts on the side with a connecting member, the holding member main body is formed with a plurality of electric wire grooves and a connecting member groove extending in a direction orthogonal to the electric wire grooves and into which the connecting member is fitted. According to the structure configured to press the connecting member fitted in the connecting member groove, the electric wire is displaced in the axial direction due to the bending of the electric wire in the recess and the fitting of the connecting member in the connecting member groove. The effect that the direct connection can be surely protected and the direct connection portion can be surely protected.

Further, the direction of the electric wire groove is substantially parallel to the printed circuit board, and the electric wire is bent in the area between the electric wire groove and the printed circuit board toward the printed circuit board side. By connecting the terminal to the conductor portion of the printed circuit board, external force is absorbed by the looseness of the electric wire at the bent portion, and the effect of further reducing the mechanical load on the connected portion can be obtained.

In the above wire groove, the width dimension on the side closer to the wire end is set larger than the wire diameter, and the width dimension of the wire groove on the side far from the wire end is set smaller than the wire diameter. , The conductor of the electric wire terminal and the printed circuit board can be held by firmly holding the electric wire in the part having the width dimension smaller than the electric wire diameter and allowing the electric wire to be slightly displaced in the part having the width dimension larger than the electric wire diameter. The effect of facilitating the connection work with the parts can be obtained.

In making the above connection, first, an electric wire holding member is fixed to the printed circuit board, the electric wire holding member is made to hold a portion of the electric wire on the front side of the end, and then the end of the electric wire is attached. By directly connecting to the conductor portion of the printed circuit board, it is not necessary to grip the electric wire with a hand or the like at the time of this direct connection work, and the work can be smoothly performed.

Furthermore, when connecting a plurality of electric wires,
Connect these wires in parallel with each other in advance,
If these electric wires are collectively set in the electric wire holding member, the work efficiency can be further increased as compared with the case where the end of each electric wire is individually connected to the conductor portion of the printed circuit board. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

2A is a partial cross-sectional side view showing the embodiment, and FIG. 2B is a front view showing the same embodiment.

FIG. 3A is a front view showing a width dimension of a front-side electric wire groove formed in the holding member main body according to the above embodiment, and FIG.
[Fig. 4] is a front view showing a width dimension of a rear electric wire groove formed in the holding member main body.

4A is a plan view showing a second embodiment of the present invention, FIG. 4B is a front view showing the same embodiment, and FIG. 4C is a sectional view taken along line AA of FIG. 4B. is there.

5A and 5B are cross-sectional views showing a modified example of the fixing means for fixing the holding member main body to the printed circuit board.

FIG. 6 is a cross-sectional view showing a modified example of the fixing means of the holding member main body to the printed circuit board.

FIG. 7 is a perspective view showing an overall structure of a general wire harness.

FIG. 8A is a partially sectional front view showing a conventional example of a structure for connecting an electric wire to a printed circuit board in a wire harness, and FIG. 8B is a perspective view showing the structure.

[Explanation of symbols]

 10 Wires 14 Connecting Tape (Connecting Member) 15 Printed Circuit Board 16 Holding Member Main Body 18 Holding Member 21 Front Wire Groove 22 Rear Wire Groove 26 Recess 43 Front Wall (Regulating Part) 44 Rear Wall (Regulating Part) 46 Holding Wall 52 Connection Tape groove (connecting member groove)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Suzuki 1-7-10 Kikuzumi, Minami-ku, Nagoya, Aichi Prefecture Harness Research Institute, Inc.

Claims (9)

[Claims] 1. In a wire harness in which an end of an electric wire is connected to a printed circuit board provided in an electric connection box, an electric wire holding member is fixed to the printed circuit board, and the electric wire holding member allows the electric wire to be attached to the electric wire rather than the end. A wire harness in which the end of this electric wire is directly connected to the conductor portion of the printed circuit board while holding the front side portion. 2. The wire harness according to claim 1, further comprising a connecting member for holding a plurality of electric wires in parallel in the electric wire holding member and connecting parts of the electric wires on the front side of the terminals. A wire harness that is characterized by that. 3. The wire harness according to claim 1, wherein the wire holding member has a wire groove into which the wire is fitted, and the holding member main body is fixed to the printed circuit board, and the wire groove. A wire harness, characterized in that the wire harness is mounted on the holding member main body in a state where the electric wire is inserted into the body, and the pressing member presses the electric wire in the mounted state. 4. The wire harness according to claim 3, wherein a recess is formed in the wire groove, and the pressing member is configured to press the middle part of the wire into the recess in a bent state. Wire harness to do. 5. The wire harness according to claim 3, wherein portions of the respective wires on the front side of the terminals are connected by a connecting member, while the holding member main body has a plurality of electric wire grooves and the electric wire grooves. A wire harness comprising: a connecting member groove extending in a direction orthogonal to each other and into which the connecting member is fitted; and the pressing member configured to press the connecting member fitted in the connecting member groove. 6. The wire harness according to claim 3, wherein a direction of the electric wire groove is substantially parallel to the printed circuit board, and an area between the electric wire groove and the printed circuit board is set. A wire harness, characterized in that an end of the electric wire is connected to a conductor portion of the printed circuit board while the electric wire is bent toward the printed circuit board side. 7. The wire harness according to claim 2, wherein the width dimension of the wire groove on the side closer to the wire end is set to be larger than the wire diameter, and the wire groove on the side far from the wire end. The wire harness is characterized in that the width dimension of is set smaller than the wire diameter. 8. In a wire harness in which an end of an electric wire is connected to a printed circuit board provided in an electric connection box, an electric wire holding member is fixed to the printed circuit board, and the electric wire holding member is attached to the electric wire from the end of the electric wire. A method for connecting a printed circuit board and an electric wire in a wire harness, characterized in that, after holding the front side portion, the end of the electric wire is directly connected to the conductor portion of the printed circuit board. 9. The method for connecting an electric wire to a printed circuit board in a wire harness according to claim 8, wherein a plurality of electric wires are mutually connected in parallel in advance, and the electric wires are collectively attached to the electric wire holding member. A method of connecting a printed circuit board and an electric wire in a wire harness, which is characterized by being set.