JPH04118874A - Tab for connecting bus bars and its forming method - Google Patents

Abstract

PURPOSE:To contact securely and stably when the tip of a tab is press-fitted in a slit to connect bus bars, without generating a biting, a damage, and a buckling, by applying a hardening process to both sides at the top of the tab. CONSTITUTION:A bus bar 12 and a tab 13 are formed integrally in a punching by a plus process from a conductive metal plate made of a copper alloy such as brass (not shown in the figure). In this case, tapers 14 for guiding the insertion is formed at both side edges at the tip of the bus bar 12, and a vertical slit 15 for reinforcing the elasticity is formed making its both ends in a round hole form 15a at the center of the bus bar, at the same time. Then, from both side edges of the tab 13 including the tapers 14, to the tip of the tab 13, an upset process if applied form the front side and the rear side, as a hardening process, to form a chamfer 16, and after that, the tab 13 is bent at a right angle to the bus bar 12, making in the erecting condition. By such a constitution, the tab 13 is never bitten to the entrance, the inner side of an erecting piece 4 is never hurt, and no buckling is generated, when the tab 13 is inserted to a long hole 5 of another bus bar 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tab for interconnecting bus bars constituting an internal circuit in an electrical junction box used for interconnecting wire harnesses, etc., and a method for forming the tab. .

[Conventional technology]

3 and 4 show a conventional interconnection structure between busbars, in which an elongated hole 5 with upright pieces 4 at both ends is provided in an upper layer busbar 3 disposed in a groove 2 of an insulating plate l. In this structure, a tab 7 that is connected to the lower bus bar 6 is press-fitted into the bus bar 5 to connect it. That is, the tab 7 is inserted into the long hole 5,
The inner surface of the rising piece 4 and the end surface 8 of the tab 7 come into contact, and both bus bars 3.6 are connected.

Insertion of the tab 7 is carried out in the process shown in FIG. tab 7 while touching
is guided into the elongated hole 5. At this time, as shown in FIG. 7, the inlet portion 5a bites into the taper 9 of the tab 7 as shown by the arrow A, and as shown in FIG. Since the tab 10 scratches the contact surface (inner surface of the rising piece 4) (see Fig. 8), there is a problem that the contact becomes unstable and conduction failure occurs. , since it is formed by bending, the hardness of the cut surface is not sufficient, and the elongated hole 5
Depending on the dimensional error, buckling may occur.

[Problem to be solved by the invention]

The present invention has been made in view of the above-mentioned problems, and when the tab is press-fitted into the elongated hole, it may cause digging, scratches, etc.
It is an object of the present invention to provide a busbar interconnection tab and a method for forming the tab having a structure that allows reliable and stable contact without buckling.

[Means to solve the problem]

In order to achieve the above object, the busbar interconnection tab of the present invention, as set forth in claim 1, includes a tab provided on the other busbar that is press-fitted and connected to a long hole provided in the negative busbar. It is characterized in that both edges of the tab are crushed and work hardened.

Further, the method for forming the same includes a step of punching out a bus bar having a desired pattern and a tab continuous thereto from a conductive metal plate by pressing, and forming a bus bar having a desired pattern on both sides of the tip of the tab. [Function] According to the present invention, the tab is press-fitted into the long hole of one of the bus bars. The tab of the other bus bar to be connected has both side edges work-hardened and has high hardness, and the burr during pressing has disappeared, so the entrance part of the long hole will dig into it.
There is no risk of damaging the long hole or the inner surface of the standing piece.
Furthermore, the increased hardness eliminates the risk of buckling.

Therefore, the contact between the busbars is stabilized, and a highly reliable electrical connection is achieved.

Hereinafter, the above configuration and operation will be specifically explained with reference to Examples.

〔Example〕

FIG. 1 shows a perspective view of a busbar interconnection tab according to the present invention, and FIG. 2 shows a side view of the same connected state. In addition,
The same reference numerals are used for the same constituent members as in the conventional example, and detailed description thereof will be omitted.

In FIG. 1, a bus bar 12 and a tab 13 are integrally stamped out of a conductive metal plate made of a prepared metal such as brass (not shown) by press working.

At that time, a taper 14 for insertion guidance is formed on both sides of the tip of the bus bar 12, and a vertical slit 15 for elasticity reinforcement with circular holes 15a at both ends is formed in the center. After crushing and work-hardening both the front and back surfaces from both side edges including the taber 14 to the tip to form a work-hardened chamfered portion 16, the tab 13 is bent at right angles to the bus bar 12 as shown in the figure and raised. state.

The length of the slit 15 is determined in advance so that one end thereof is located on the bus bar 12, and the lower end 16a of the work-hardened chamfered portion 16 is closer to the upper end surface of the cut-up piece 4, as shown in FIG. It is also preferable that the lower part be positioned slightly below the lower part.

According to the above structure, the tab 13 is formed as a chamfered part 16 which is work-hardened on both sides of the tip end, and the chamfered part 16 is eliminated, so that the bus bar 3 When inserting into the elongated hole 5, the entrance part 5a of the elongated hole 5 does not dig into the elongated hole 5, nor does it damage the inner surface of the upright piece 4, so there is no need to worry about buckling. do not have.

〔Effect of the invention〕

As explained above, according to the present invention, both sides of the tip of the tab are work-hardened, so when press-fitting the tab into the long hole, no digging, scratching, buckling, etc. will occur, and the tab will be securely connected. It is possible to provide a busbar interconnection tab having a structure that allows stable contact and a method for forming the same.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a busbar interconnection tab showing an embodiment of the present invention, FIG. 2 is a side view showing the same connection state as above, FIG. 3 is a perspective view showing a conventional busbar connection structure, and FIG. The figure is a perspective view of the same separated state as above, Figure 5 is a sectional view taken along line V-V in Figure 4, Figure 6 is a-
C is a side view showing the connection process of the bus bar in FIG. 3, FIG. 7 is an enlarged side view of FIG. 6, and FIG. 8 is an explanatory diagram of scars caused by tab connection. 3... Bus bar, 4... Standing piece, 5... Long hole, 12... Bus bar 13... Tab, 14... Taper, 15... Slit, 16... (processing) hardened) chamfer. Patent applicant: Yazaki Sogyo Co., Ltd. 5...Elongated hole 12...Bus bar 15...Slit 16...(work hardened) chamfer

Claims (2)

[Claims] (1) A busbar interconnection, which is a tab provided on the other busbar that is press-fitted into a long hole provided in one busbar, and is characterized in that both edges of the tab are crushed and work-hardened. tab. (2) A step of punching out a bus bar having a desired pattern and a tab connected thereto from a conductive metal plate by pressing, a step of crushing both sides of the tip of the tab and work hardening it, and work hardening. A method for forming a busbar interconnection tab, comprising the steps of bending the tab and raising it up from the busbar.