JP2000048868A - Welding structure of bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize punching dies of a bus bar, and to reduce the manufacturing cost of the bus bar by juxtaposing respective bus bar pieces manufacture by being divided into the proper number in a prescribed bus bar shape, and mutually welding/uniting the divided end parts of the respective bus bar pieces. SOLUTION: A bus bar 7 is manufactured by being punched by respective dies in a state of bus bar pieces 7-1, 7-2 divided into left/right two pieces in the width directional almost central position. In the divided bus bar pieces 7-1, 7-2, the divided end parts (a, b) are butted against each other, and a laser beam is irradiated so as to stride over these divided end parts (a, b) to mutually weld the divided end parts (a, b) by a laser. Thus, since a required process is only to manufacture the bus bar by punching the respective divided bus bar pieces 7-1, 7-2, the dies are miniaturized, and are formed inexpensively as a simple pattern part shape, so that the manufacturing cost of the bus bar 7 can also be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding structure most suitable for a bus bar housed in an electric junction box.

[0002]

2. Description of the Related Art An electrical junction box used for branch connection of an automobile wire harness or the like to various electrical components has a branch connection point concentrated in one place, and the wiring is rationally and economically branched. With the increase in the density of wire harnesses, various types have been developed according to vehicle types or applications.

As shown in FIG. 3, a bus bar 7A is formed from a hoop material 6 by a press die as shown in FIG.
To 7C, and each of the bus bars 7A to 7C
The tab terminals 7a and 7b are cut and raised from the pattern portion in the vertical direction, and insulating plates 8A to 8C are interposed between the bus bars 7A to 7C, respectively. And a lower case 9B.

[0004]

However, since each of the bus bars 7A to 7C is manufactured by integrally punching out the hoop material, each of the dies becomes large and has a complicated pattern shape, so that it is expensive. Therefore, there is a problem that the manufacturing cost of the bus bar also increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a bus bar welding structure capable of reducing a bus bar manufacturing cost by reducing the size of a bus bar punching die. .

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a bus bar housed in an electric connection box, wherein each bus bar piece manufactured by dividing into an appropriate number is formed into a predetermined bus bar shape. The present invention provides a bus bar welding structure, wherein the divided end portions of the bus bar pieces are welded to each other and united.

According to the present invention, a bus bar having a predetermined shape is divided into an appropriate number, and each of the bus bars is manufactured by punching with a die. They are welded to each other to form a predetermined bus bar shape.

As described in claim 2, it is preferable that the divided ends of the bus bar pieces are abutted with each other by laser welding, or the raised divided ends of the bus bar pieces are abutted with each other by ultrasonic welding or resistance welding. .

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. Note that the same components and operations as those of the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1B, the bus bar 7
It is assumed that a predetermined bus bar shape as shown in FIG.

As shown in FIG. 1A, the bus bar 7 is manufactured by punching out each of the molds in a state where the bus bar 7 is divided into two right and left parts at a substantially central position in the width direction. The bus bar may be divided into three or more appropriate numbers.

Each of the divided bus bar pieces 7-
1 and 7-2, as shown in FIG. 1B and FIG. 2A, butt the divided ends a and b and irradiate the laser beam LB across the divided ends a and b. By doing so, the divided ends a and b are mutually laser-welded.

In the case of welding not by laser welding but by ultrasonic welding or resistance welding, as shown in FIG. 2B, the divided end portions of the busbar pieces 7-1 and 7-2 are raised. The divided ends a and b are mutually ultrasonic-welded or resistance-welded by abutting a and b and arranging the electrodes 10a and 10b on both sides of the divided ends a and b, respectively.

As described above, in a state where the bus bar 7 is divided into a plurality of parts, each is manufactured by punching with a die,
After that, the divided ends a of the bus bar pieces 7-1 and 7-2,
b are welded to each other and combined into a predetermined busbar shape, so that the mold is divided into the respective busbar pieces 7-1 and 7-2.
Can be manufactured by punching, so that the size of the mold is reduced, the shape of the pattern portion becomes simple, the cost is reduced, and the manufacturing cost of the bus bar 7 is reduced.

In the case of the laser welding described above, since the laser beam LB is non-contact, each of the divided ends a and b can be reliably welded only with a simple jig, and the welding seconds per spot can be shortened in a short time. Therefore, there is an advantage that the mass productivity is good, and since the beam diameter of the laser beam LB is small, the pattern portion of the bus bar 7 can be narrowed to increase the degree of freedom in designing wiring.

[0016] Of the various types of laser welding, YAG laser welding is non-contact, has a small heat-affected layer,
It has low power consumption, is small in size, can be easily used for three-dimensional welding due to the use of optical fibers, and can divide a beam into multiple parts for simultaneous multipoint welding.
It is optimal because the automation is easy and the production cost is significantly reduced.

[0017]

As is clear from the above description, the bus bar welding structure of the present invention is manufactured by punching a bus bar having a predetermined shape into a suitable number of pieces and punching them with a die. Since the divided end portions of the bus bar pieces manufactured by division are welded to each other and united into a predetermined bus bar shape, the mold may be manufactured by punching each of the divided bus bar pieces. The size of the mold is reduced and the shape of the pattern portion is simplified, so that the cost is reduced, and the manufacturing cost of the bus bar is also reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bus bar according to the present invention, in which (a) is a perspective view before welding and (b) is a perspective view after welding.

FIG. 2A is a sectional view of a laser welding procedure, and FIG. 2B is a sectional view of an ultrasonic welding or resistance welding procedure.

FIG. 3 is an exploded perspective view of a conventional bus bar processing and assembling procedure.

[Explanation of symbols]

 7 Busbar 7-1, 7-2 Busbar pieces a, b Split end

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Atsuhiko Fujii 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in Harness Research Institute, Inc. (reference) 4E065 EA04 4E067 AA01 BF00 EB00 4E068 BA00 BE00 DA06 5E085 BB06 CC03 CC04 DD03 DD04 EE02 HH11 HH12 HH13 JJ38

Claims (2)

[Claims] 1. A bus bar to be accommodated in an electric junction box, wherein bus bar pieces manufactured by dividing into an appropriate number are arranged in a predetermined bus bar shape, and the divided ends of the bus bar pieces are welded to each other. A welding structure for a bus bar, wherein the welding structure is combined. 2. The bus bar according to claim 1, wherein the divided ends of the bus bar pieces are joined by laser welding, or the raised divided ends of the bus bar pieces are joined by ultrasonic welding or resistance welding. Welded structure.