JPH07230834A - Bus bar and tab terminal fixing structure - Google Patents

Abstract

PURPOSE:To fix a bus bar to a tab terminal securely by bring a mouth edge of an engagement port of a bus bar on the side where the tab terminal is elastically deformed into abutment on a tapered surface. CONSTITUTION:A tab terminal 3 is formed by punching a conductive metal plate, and stoppers 4 are protruded on both sides of its base part end. The tab terminal 3 is inserted into an engagement port 2 in a bus bar 1 in such a way that the stopper 4 is applied to a mouth edge of the engagement port 2. After that, the tab terminal 3 is held and fixed by a jig, and additional tightening is applied to the bus bar 1 by pressing an end surface of the tab terminal 3 protruded from the engagement port 2 by a press till its end surface is elastically deformed. The tab terminal 3 can thus be fixed to the bus bar 1 completely. securely and strongly, and elastically deformed end parts 5a, 5b are bright into abutment on tapered surfaces 2a, 2b by elastic deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a bus bar and a tab terminal.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a bus bar 20 used for an electric connection box of an automobile is formed by punching a conductive metal plate made of copper alloy or the like into a predetermined shape and bending tab terminals 21. It is commonly used.

On the other hand, recently, as shown in FIGS. 5, 6 and 7, as a fixing structure for the bus bar 31 and the tab terminal 33, as described in Japanese Utility Model Laid-Open No. 5-55457, the bus bar 31 has a structure. A stopper 34 is provided at the base end to abut the edge 37 of the fitting port 32 on the fitted fitting port 32.
And a structure in which a tab terminal 33 provided with a plurality of concave and convex portions 35 to be crimped to the inner surface of the fitting port 32 in the width direction of the base end plate is press-fitted, and the tab terminal 33 is provided with a compression plastically deformed end portion 36 and fixed. It has been known.

[0004]

However, in the conventional fixing structure of the bus bar 31 and the tab terminal 33 configured as described above, the edge 37 of the fitting port 32 formed in the bus bar 31 and the plastically deformed tab. Gap 3 between the ends of the terminal 33
8 occurs, the contact area between the bus bar 31 and the tab terminal 33 is reduced, the connection strength between the two is reduced, and the electrical contact resistance is increased. However, there is a problem that the temperature rises and the environmental resistance of the parts is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a bus bar / tab terminal fixing structure for securely fixing the bus bar / tab terminal without being affected by the shape and material of the bus bar. provide.

[0006]

In order to achieve the above-mentioned object, the present invention inserts and fits a tab terminal provided with a stopper having a projection shape into a fitting port of a bus bar, and an end of the tab terminal. In the fixing structure of the bus bar and the tab terminal, the plastic deformation part is formed to form the plastic deformation part and at the same time the stopper is brought into close contact with the bus bar so that the bus bar is pinched and fixed by the stopper of the tab terminal and the plastic deformation part. It is characterized in that the edge of the landing end on the side where the tab terminal is plastically deformed is formed into a tapered surface.

[0007]

According to the structure for fixing the bus bar and the tab terminal of the present invention, after the tab terminal is inserted into the fitting hole formed in the bus bar, the end portion of the tab terminal is compression-plastically deformed to form the plastically deformed portion. Then, the plastically deformed portion of the tab terminal comes into pressure contact with the tapered surface, and the tab terminal is fitted to the bus bar.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a main part lacking view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing an assembling process.
In FIG. 1, 1 is a conductive metal plate made of a copper alloy or the like in which a fitting port 2 is formed in a shape in which an end 5 of a tab terminal 3 can penetrate.
As shown in FIG. 1, at the edge of the back surface of the fitting port 2 with respect to the surface into which the tab terminal 3 is inserted, as shown in FIG.
As a taper surface 2a chamfered at °, 45 °, 60 ° or the like, or as another embodiment, an R-shaped taper surface 2b is provided as shown in FIG. The positions and intervals of the insertion ports 2 and the shape of the taper surface may be changed in design as necessary. Further, the tapered surface may be on both side surfaces of the fitting port 2.

Reference numeral 3 denotes a tab terminal formed by punching out a conductive metal plate made of copper alloy or the like, and reference numeral 4 denotes a stopper provided on both sides of the base end of the tab terminal 3.

In order to fix the tab terminal 3 to the bus bar 1, the tab terminal 3 is brought into contact with the fitting port 2 of the bus bar 1 and the stopper 4 is brought into contact with the edge of the fitting port 2 as shown in FIG. , The tab terminal 3 is sandwiched and fixed by a jig, and the end surface of the tab terminal 3 protruding from the fitting port 2 is pressed by a press machine until the end surface is plastically deformed, and the bus bar 1 is tightened.
The tab terminal 3 is fixed to the bus bar 1 completely and firmly. At this time, the plastically deformed ends 5a and 5b come into contact with the tapered surfaces 2a and 2b due to the plastic deformation.

[0011]

As described above, according to the fixing structure of the bus bar 1 and the tab terminal 3 of the present invention, as described above,
When the tab terminal 3 is inserted into the fitting port 2 formed in the plate surface of the bus bar 1 and the end surface of the tab terminal 3 is pressed to tighten the bus bar 1, the plastically deformed ends 5a and 5b are tapered surfaces. Tapered surfaces 2a, 2b that enter the gap near 2a, 2b
Therefore, the contact area between the bus bar 1 and the tab terminal 3 becomes larger than in the conventional case. As a result, the contact strength between the bus bar 1 and the tab terminal 3 increases and the electrical contact resistance decreases, so that the heat generated at the connection between the bus bar 1 and the tab terminal 3 during energization also decreases, and an increase in the ambient temperature is suppressed. be able to. Depending on the design, the plastically deformed end portions 5a and 5b may be embedded in the grooves near the tapered surfaces 2a and 2b so that the end surface of the tab terminal 3 and the bus bar 1 are not filled.
Can be the same as the plate surface height of. In this case, since the busbars 1 can be densely arranged on the insulating substrate, the pattern design can be facilitated, the number of layers of the busbars stacked in the electric connection box can be reduced, and the electric connection box can be downsized. There are excellent advantages.

Further, when the tapered surface 2b has an R shape as shown in FIG. 3, when some external force is applied to the tapered surface 2b,
It is possible to relieve the stress concentration in the cutout portion, and more firmly and firmly connect and fix.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part lacking view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an assembling process of the present invention.

FIG. 3 is an explanatory view of a main part lacking view showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional bus bar.

FIG. 5 is an explanatory view showing a conventional assembly process of a bus bar and a tab terminal.

FIG. 6 is an explanatory view of a main portion showing a conventional fixing structure of a bus bar and a tab terminal.

7 is a partially enlarged explanatory view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bus bar 2 ... Fitting port 2a ... Tapered surface 3 ... Tab terminal 4 ... Stopper 5 ... End part 5a ... Plastic deformation part

Claims (1)

[Claims] 1. A tab terminal (3) provided with a protrusion-shaped stopper (4) is inserted and fitted into a fitting port (2) of a bus bar (1), and an end portion of the tab terminal (3). The plastic deformation portion (5a) is formed by plastically deforming (5), and at the same time, the stopper (4) is brought into close contact with the bus bar (1), so that the stopper (4) and the plastic deformation portion (5a) of the tab terminal (3) are formed. ) In the structure for fixing the bus bar and the tab terminal by sandwiching and fixing the bus bar (1), the edge of the fitting port (2) of the bus bar (1) on the side where the tab terminal (3) is plastically deformed is tapered. A structure for fixing a bus bar and a tab terminal, characterized in being formed in (2a).