JP2000058992A - Interlayer connecting structure for bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an interlayer connection between bus bars respectively arranged and fixed on the front and rear surfaces of an insulating substrate easier and inexpensive, and at the same time, to improve the economy of the bus bars by improving the latitude in design and dimensional accuracy of the bars. SOLUTION: Bus bars 12A and 12B, respectively arranged and fixed on the front and rear surfaces of an insulating substrate 11, are connected electrically to each other through an electric wire 20 by forming electric wire press- contacting blades 15A and 15B into the bus bars 12A and 12B in the width direction from the side edges of the bus bars 12A and 12B and a notch 16 into the substrate 11 for avoiding the jointing of the electric wire press- contacting blade forming sections of the bus bars 12A and 12B with the substrate and connecting the electric wire 20 to the electric wire press-contacting blades 15A and 15B by making the wire 20 bite into the blades 15A and 15B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlayer connection structure for connecting two-layer bus bars to each other in an electric junction box installed in, for example, an automobile. The present invention relates to an interlayer connection structure of bus bars for connecting the respective bus bars provided to each other.

[0002]

2. Description of the Related Art For example, as a well-known example of an interconnecting structure between bus bars for arranging bus bars on both front and back surfaces of an insulating circuit wiring board and connecting the bus bars on both front and back surfaces, for example, Japanese Unexamined Utility Model Publication No. 2-120765. There is something shown in the issue. As shown in FIG. 3, the connection structure between the bus bars, which is a well-known example, connects a front bus bar 2 disposed on the front surface of the insulating substrate 1 and a rear bus bar 3 disposed on the rear surface of the insulating substrate 1. In this connection structure, a long hole 4 is formed in the front side bus bar 2, and a tab 6 having a vertical slit 5 is formed in the back side bus bar 3 by bending means. Through the tab 6 from the back side to the front side of the insulating substrate 1 and press-fit its penetrating end into a long hole 4 formed in the front side bus bar 2 so that the front side bus bar 2 and the back side bus bar 3 Are electrically connected to each other.

[0003]

However, in the above-mentioned conventional electrical connection structure, when the front bus bar 2 provided with the long holes 4 and the back bus bar 3 provided with the tabs 6 are connected, the long holes are not connected. Since high accuracy is required for the positional relationship between the tab 4 and the tab 6, the dimensional accuracy of the front bus bar 2 and the rear bus bar 3 must be increased.
The cost of the press die used to press-mold the front busbar 2 and the rear busbar 3 increases.

Further, when forming the rear bus bar 3 provided with the vertical slits 5 and the tabs 6, it is necessary to perform a bending process for forming the tabs 6 in an upright position, which increases the forming cost of the rear bus bar 3.

In the case where a large number of busbars must be arranged and used on the same plane of an insulating substrate in an electric connection box mounted on an automobile, for example, the above-mentioned electric connection structure is made of a single metal plate material. It is necessary to have a layout for efficiently forming such a large number of busbars. In particular, tabs 6 must be formed upright on the back side busbar 3, which restricts the shape of the large number of busbars. There was a problem that the efficiency of forming (materials) of each bus bar was deteriorated and the economic efficiency was poor.

The present invention has been made in view of such a problem, and it is intended to simplify the interlayer connection between the two bus bars arranged and fixed respectively on the front and back surfaces of the insulating substrate, and to connect the bus bars at a low cost. In addition, an object of the present invention is to provide a bus bar interlayer connection structure that improves the economical efficiency by increasing the degree of freedom in the design and dimensional accuracy of the bus bar.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, bus bars are arranged and fixed on both front and back surfaces of an insulating substrate, and the front and back bus bars are connected to each other. In the interlayer connection structure of the bus bar, both the front and back bus bars are formed with wire press-contact blades cut out in the width direction from the edges thereof, and further, the insulating substrate is formed on both the bus bars. The notch for avoiding the joint between the wire press-connecting blade forming portion and the insulating substrate is formed, and the wire is bitten and connected between the wire press-connecting blades formed on both of the bus bars. It is characterized in that it is an interlayer connection structure of a bus bar for electrically connecting both front and back bus bars via electric wires.

According to a second aspect of the present invention, in addition to the first aspect, an electric wire end fixing portion for accommodating and fixing both ends of the electric wire for performing the interlayer connection of the bus bar on both front and back surfaces of the insulating substrate. Is characterized in that it is an interlayer connection structure of the bus bar that forms.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings.

1 and 2, reference numeral 11 denotes an insulating substrate formed of an insulating material.
The bus bars 12A and 12B are fixed to both surfaces of the front surface 11A and the back surface 11B by welding means 13, respectively. Each of the bus bars 12A and 12B is cut into a shape necessary for forming an electric circuit, for example, by punching a sheet metal material into a predetermined shape. Side 1 of 11
Edges 14A and 14B located close to 1C are formed.

Edges 14 of bus bars 12A and 12B
A and 14B are formed with wire pressing blades 15A and 15B which are cut out from the edges in the width direction.
The insulating substrate 11 has the wire pressing blade 15
A notch 16 is formed to prevent the formation portions of A and 15B from contacting the insulating substrate 11 so as to face inward from the side 11C.

Reference numerals 17A and 17B denote electric wire end fixing portions which are integrally formed on the front surface 11A and the rear surface 11B of the insulating substrate 11 and are provided for fixing the ends of electric wires described later. , These wire end fastening portions 17
A, 17B are inner wall surfaces 18A, 18A,
18B is provided with ridges 19A and 19B for holding the electric wire end.

Reference numeral 20 denotes a covered electric wire having a core bundle having a bundle diameter larger than the notch width forming the wire pressing blades 15A and 15B.
It is cut to a length of about 3 cm and bent in a U-shape.

The above is the present embodiment. Next, the operation will be described.
A, 17B and insulating substrate 11 provided with notch 16
The bus bars 12A and 12B formed with the wire pressing blades 15A and 15B in advance are applied to the front side 11A and the back side 11B respectively, and the wire pressing blades 15A and 1B are further applied.
5B are positioned so as to be located within the notch 16 of the insulating substrate 11, and then the bus bars 12A, 12B
To obtain a circuit board integrally fixed to the insulating substrate 11 by the welding means 13.

Next, an insulated wire 20 cut to a desired length is prepared, and the insulated wire 20 is pushed into the notch 16 so that the insulated wire 20 is inserted into the front and back wire pressing blades 15A. , 15B. Due to the press-fitting operation of the electric wire 20, the covering of the coated electric wire 20 is performed by the electric wire pressing blade 15.
A, 15B, the core bundle is in a state of being bitten by the wire pressing blades 15A, 15B, and is electrically connected to the bus bars 12A, 12B.

Thus, both ends of the insulated wire 20 electrically connected to the wire pressure welding blades 15A, 15B are pushed into the wire end fastening portions 17A, 17B, and the insulated wire ends are projected by the ridges 19A, 19B. By maintaining the inside of the end fastening portions 17A and 17B, the insulation of both ends of the covered electric wire is maintained, and the detachment of the covered electric wire 20 from the circuit board is effectively prevented.

As described above, in the present embodiment, the bus bars 12A and 12B fixed to the front and back surfaces of the insulating substrate 11, respectively, are the bus bars 12A and 12B.
A simple operation of press-fitting (pushing) the covered electric wire 20 into the wire press-connecting blades 15A, 15B formed on the front and back sides of the bus bar 12A, 12B via the covered electric wire 20.
Can be electrically connected to each other, and the connection work of both bus bars is good.

In this embodiment, since the front and back bus bars 12A and 12B are connected to each other using the flexible coated electric wire 20, the front and back bus bars 12A and 12B are connected to each other.
The degree of freedom of the set positions of the wire press-connecting blades 15A and 15B, which are the connection portions with the insulated wires 20 in A and 12B, is increased, and the dimensional accuracy of the wire press-connecting blade formation position is also relaxed. Connection medium is coated wire 20
Therefore, an economical and low-cost interlayer connection structure can be provided by using a simple member.

Further, since the bus bars can be easily punched (pressed) using a metal plate as a raw material, the manufacturing economics of these bus bars are greatly improved.

[0020]

As described above, according to the present invention, the wire pressure welding blades 15A, 15A, formed on both bus bars 12A, 12B attached (laminated) on both the front and back surfaces of the insulating substrate 11. 15B, the insulated wire 20 is bitten, and both busbars 12A are inserted through the insulated wire 20.
And 12B are electrically connected to each other, so that both bus bars 12A and 12B can be easily connected. In addition, the degree of freedom in the shape and setting of both bus bars 12A and 12B is increased, and the dimensional accuracy of those bus bars is relaxed, so that an economically low-cost interlayer connection structure can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an interlayer connection structure of the present invention.

FIG. 2 is an explanatory sectional view showing an interlayer connection state showing an embodiment of the interlayer connection structure of the present invention.

FIG. 3 is a perspective view showing a conventional interlayer connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Insulating board 12A, 12B ... Bus bar 13 ... Welding means 14A, 14B ... Edge 15A, 15B ... Wire press-contact blade 16 ... Notch 17A, 17B ... Wire end fastening part 18A, 18B ... Inner wall surface 19A, 19B ... Projection 20: Insulated wire

Claims (2)

[Claims] 1. Bus bars (12A) and (12B) are arranged and fixed on both front and back surfaces of an insulating substrate (11), respectively, and both front and back bus bars (12A) and (12B) are provided.
In the interlayer connection structure of the bus bar, the electric wire press-connecting blades (1) formed by notching the bus bars (12A) and (12B) on both the front and back sides in the width direction from the edges thereof.
5A) and (15B), and both of the bus bars (12A), (12
A notch (16) is formed to avoid joining between the wire press-contact blade forming portion formed in B) and the insulating substrate (11), and is formed in both of the bus bars (12A) and (12B). The electric wire (20) is bitten and connected between the electric wire pressure welding blades (15A) and (15B), and both the front and back bus bars (12A) and (1) are connected via the electric wire (20).
2B), the bus bars being electrically connected to each other. 2. The front and back surfaces (11) of an insulating substrate (11).
A) and (11B) are characterized in that wire end fastening portions (17A) and (17B) for accommodating and fastening both ends of the wire (20) performing interlayer connection of the bus bar are formed. The bus bar interlayer connection structure according to claim 1.