JP3708336B2 - Busbar connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure for bus bars housed in an electrical junction box.
[0002]
[Prior art]
The electrical junction box used for branch connection of automotive wire harnesses to various electrical components is to branch the wiring rationally and economically by concentrating the branch connection points in one place. With increasing density of harnesses, various types have been developed for each vehicle type or application.
[0003]
As shown in FIG. 10, the electric connection box as described above is formed by punching the bus bars 7A to 7C from the hoop material 6 with a press die and moving the tab terminals 7a and 7b up and down from the pattern portions of the bus bars 7A to 7C. In some cases, the insulating plates 8A to 8C are interposed between the bus bars 7A to 7C and stacked together, and are accommodated in the upper case 9A and the lower case 9B of the electrical connection box 9, respectively. In addition, 10 is a relay terminal, 11 and 12 are a relay and a fuse.
[0004]
[Problems to be solved by the invention]
However, since each of the bus bars 7A to 7C has a different shape of the pattern portion, it is necessary to punch each of them with a dedicated press die, so that the manufacturing cost is increased and the grade of the electric junction box of the same vehicle type is also increased. If it is different, the shape of the pattern part of the bus bar is different, so there is a problem that there is no flexibility.
[0005]
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a bus bar connection structure that can reduce the manufacturing cost and is excellent in flexibility.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a connection structure of a bus bar accommodated in an electrical junction box,
A strip-shaped bus bar with connection holes drilled at a constant pitch is cut to an appropriate length, and the cut bus bar pieces are combined and arranged in a predetermined pattern shape. While being stacked in multiple stages so as to match, there are provided connection pins that fit into and contact with corresponding connection holes in the upper and lower bus bar pieces, respectively. The present invention provides a bus bar connection structure comprising a diameter portion and a small diameter portion that is smaller in diameter than the connection hole and connects the large diameter portions to each other.
[0007]
According to the present invention, a strip-shaped bus bar having connection holes formed at a constant pitch is manufactured, the strip-shaped bus bar is cut into an appropriate length, and the cut bus bar pieces are combined to be arranged in a predetermined pattern shape . Then, this array is laminated in multiple stages so that the upper and lower connection holes match.
[0008]
Then, the upper and lower bus bar pieces are electrically connected to each other through the small diameter portion of the connection pin by inserting and contacting the large diameter portions of the connection pins into the corresponding connection holes of the upper and lower bus bar pieces. Get connected. Note that a jumper or the like may be used to electrically connect bus bar pieces of the same layer.
[0009]
The large-diameter portion of the connection pin has a structure having a spring portion that fits into the connection hole and comes into contact with a spring (Claim 2), and has a tapered portion that press-fits and contacts the connection hole (Claim 3), a screw is formed at the end of the small-diameter portion, and is a nut that is screwed into this screw to clamp the bus bar piece from above and below (Claim 4), and is fitted into the connection hole And a structure having a soldering part that fits into the connection hole and is melted by heat (Claim 6). Any one or a mixture can be used.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same number is attached | subjected to the location of the same structure and effect | action as a prior art, and detailed description is abbreviate | omitted.
[0011]
As shown in FIG. 3, a strip bus bar 13 made of copper or a copper alloy with connection holes 13 a formed at a constant pitch P is manufactured. As for the width W of the bus bar 13, when the bus bars 13 are arranged side by side (see a two-dot chain line a), a constant pitch P is maintained in the vertical and horizontal directions in the connection holes 13a of the bus bars 13 arranged side by side with a gap for insulation. Set to
[0012]
The strip-shaped bus bar 13 is cut at an appropriate length in the length direction. For example, if two connecting holes 13a have the required length, cut at the C1 position, and if three connecting holes 13a have the required length, cut at the C2 position, five connecting holes. If 13a is the required length, cut at the C3 position.
[0013]
As shown in FIG. 1, the bus bar pieces 13-1 to 13-6 cut as described above are appropriately combined and arranged in a predetermined pattern shape so as to maintain the pitch P in the vertical and horizontal directions. The bus bar 13A of the layer is made. Similarly, the cut bus bar pieces 13-7 to 13-10 are appropriately combined to maintain the pitch P in the vertical and horizontal directions so as to intersect with the bus bar pieces 13-1 to 13-6 in the first layer. In this way, the second-layer bus bar 13B is made by arranging in a predetermined pattern shape . Hereinafter, similarly, as shown in part in FIG. 2, a third-layer bus bar 13C and a fourth-layer bus bar 13D are formed.
[0014]
And each bus bar 13A-13D produced in this way is laminated | stacked on multiple stages through an insulating board (not shown). At this time, the connection holes 13a of the bus bar pieces 13-1, ... of the upper and lower bus bars 13A, ... are set to coincide with each other in the vertical direction.
[0015]
In order to electrically connect the upper and lower bus bars 13A,..., As shown in FIG. 5, the upper and lower bus bar pieces 13-1,. The connection pin 14A is used.
[0016]
This connection pin 14A is composed of a large-diameter portion 14a that fits into and comes into contact with the connection hole 13a, and a small-diameter portion 14b that is smaller in diameter than the connection hole 13a and connects the large-diameter portions 14a to each other. The diameter portion 14a is inflated into a spherical shape to form a slit, thereby being fitted into the connection hole 13a and brought into contact with a spring.
[0017]
The large-diameter portion 14a of the connection pin 14A is provided at a position corresponding to the vertical gap between the bus bars 13A,... With respect to the small-diameter portion 14b, for example, as illustrated on the left side of FIG. In connecting the bus bar pieces of the first, second, and third layer bus bars 13A, 13B, and 13C, 3 corresponding to the connection holes 13a of the bus bar pieces of the bus bars 13A to 13C of the respective layers. A type in which the large-diameter portions 14a are formed in upper, middle, lower and three stages is used. Similarly, as illustrated on the right side of FIG. 5B, in the case where the bus bar pieces of the first layer and the third layer bus bars 13A and 13C are connected, the first layer bus bar 13A and the third layer A type in which two large-diameter portions 14a corresponding to the connection holes 13a of each bus bar piece of the bus bar 13C in the layer are formed in two upper and lower stages is used. In this case, the small-diameter portion 14b penetrates the connection hole 13a of the bus bar piece of the second-layer bus bar 13B so as not to come into contact therewith. In addition, if the small diameter part 14b which penetrates the connection hole 13a is previously covered with an insulating synthetic resin tube, contact with the connection hole 13a can be reliably prevented.
[0018]
In order to electrically connect the bus bar pieces of the upper and lower bus bars 13A,... Using the connection pins 14A, first, as shown in FIG. The large-diameter portion 14a below the two connection pins 14A-1 and 14A-2 is fitted into and brought into contact with the necessary connection hole 13a.
[0019]
Next, the middle of the first connection pin 14A-1 while the connection hole 13a of the bus bar piece of the third layer bus bar 13C is passed through the large diameter portion 14a on the upper part of the first connection pin 14A-1 from above. The large-diameter portion 14a and the large-diameter portion 14a on the upper portion of the second connection pin 14A-2 are fitted into and in contact with each other.
[0020]
Then, the large-diameter portion 14a below the third connection pin 14A-3 is fitted into and brought into contact with the necessary connection hole 13a of the bus bar piece of the third-layer bus bar 13C.
[0021]
Next, the upper part of the third connection pin 14A-3 while passing through the large-diameter portion 14a of the upper part of the first connection pin 14A-1 through the connection hole 13a of the bus bar piece of the second layer bus bar 13B from above. Is inserted into and brought into contact with the large-diameter portion 14a.
[0022]
Then, the lower large-diameter portion 14a of the fourth connection pin 14A-4 is fitted into and brought into contact with the necessary connection hole 13a of the bus bar piece of the second-layer bus bar 13B.
[0023]
Next, from the upper side, the connecting hole 13a of the bus bar piece of the first layer bus bar 13A is inserted into the large diameter portion 14a on the upper part of the first connecting pin 14A-1 and the upper diameter of the upper part of the fourth connecting pin 14A-4. Each is inserted into and brought into contact with the portion 14a.
[0024]
By such a procedure, the bus bar pieces of the upper and lower bus bars 13A,... Can be electrically connected using the connection pins 14A.
[0025]
Further, in order to electrically connect the bus bar pieces 13-1, 13-2,... In the same layer, as shown in FIG. 4 (a), a boss 13b that can be press-fitted into the connection hole 13a is punched out. A jumper bus bar piece 13 'is prepared, and as shown in FIG. 4B, each boss 13b of the bus bar piece 13' extends over the bus bar pieces 13-1, 13-2,. It only has to be press-fitted into contact with each other. A jumper wire may be used instead of the bus bar piece 13 '.
[0026]
In the bus bar connection structure as described above, the bus bars 13A,... Are combined with the bus bar pieces 13-1,... Obtained by cutting the strip-shaped bus bars 13 having the connection holes 13a at a constant pitch P into appropriate lengths. Accordingly, since only be arranged in a predetermined pattern, as in the prior art bus bars 13A, since ... there is no need to punch a dedicated press molds, and the manufacturing cost is cheaper, busbars 13-1, ... a .. Can be adapted to any shape of the pattern portion of the bus bar 13A,...
[0027]
Further, the upper and lower bus bar pieces 13-1,... Can be electrically connected simply by inserting the connection pins 14A into the connection holes 13a and bringing them into contact with each other. Further, since the bus bar pieces 13-1,... Are arranged and connected by the connection pins 14A, it becomes easy to become familiar with automation, the cost is reduced, and the quality is stabilized.
[0028]
The large-diameter portion 14a of the connection pin 14A is inflated into a spherical shape to form a slit so as to be fitted into the connection hole 13a of the bus bar piece and come into contact with the spring, but the connection shown in FIG. Like the pin 14B, the truncated cone-shaped large-diameter portion 14e is screwed to the screw 14c at the end of the small-diameter portion 14b, and the large-diameter portion 14d is press-fitted into the connection hole 13a of the bus bar piece to make contact. You may make it let it.
[0029]
Further, like the connection pin 14C shown in FIG. 7, a spherical large diameter portion (spreading portion) 14f is formed at the end or intermediate portion of the small diameter portion 14b, and this large diameter portion 14f is used for connecting the bus bar pieces. You may make it fit in the hole 13a, spread and contact.
[0030]
Further, as in the connection pin 14D shown in FIG. 8, a spherical solder large-diameter portion 14g is attached to an end portion or an intermediate portion of the small-diameter portion 14b, and the large-diameter portion 14g is fitted into the connection hole 13a of the bus bar piece. It may be melted with heat and brought into contact.
[0031]
Furthermore, as in the connection pin 14E shown in FIG. 9, double nuts (large diameter portions) 14h and 14i are screwed onto the screws 14c at the end of the small diameter portion 14b, and the bus bar pieces are connected with the double nuts 14h and 14i. You may make it contact | connect from upper and lower sides.
[0032]
【The invention's effect】
As is clear from the above description, the bus bar connection structure of the present invention is a multi-stage arrangement of bus bar pieces obtained by cutting strip-shaped bus bars with connection holes formed at a constant pitch and arranged in a predetermined pattern shape. Since the upper and lower bus bar pieces are electrically connected to each other by stacking and connecting the contact pins into the corresponding connection holes of the upper and lower bus bar pieces, the bus bar is connected to the bus bar. Since it is only necessary to arrange the pieces in combination, it is not necessary to punch out the bus bar with a dedicated press die as in the prior art, and the manufacturing cost is reduced. Flexibility is greatly improved by adapting to shapes.
[0033]
Further, the upper and lower bus bar pieces can be electrically connected simply by inserting the connection pins into the connection holes and bringing them into contact with each other, so that the connection can be easily performed. Furthermore, since it is only necessary to arrange the bus bar pieces and connect them with the connection pins, it becomes easy to adapt to automation, the cost is reduced, and the quality is stabilized.
[Brief description of the drawings]
FIG. 1 is a perspective view of a bus bar connection structure of the present invention.
FIG. 2 is a cross-sectional view of a bus bar connection structure.
FIG. 3 is a perspective view of a strip-shaped bus bar.
4A and 4B are jumper bus bar pieces, in which FIG. 4A is a perspective view and FIG. 4B is a cross-sectional view.
5A and 5B are connection pins of a first example, in which FIG. 5A is a perspective view, and FIG. 5B is a connection cross-sectional view.
6A and 6B are connection pins of a second example, in which FIG. 6A is a perspective view, and FIG. 6B is a connection cross-sectional view.
7A and 7B are connection pins of a third example, wherein FIG. 7A is a perspective view, and FIG. 7B is a connection cross-sectional view.
8A and 8B are connection pins of a fourth example, where FIG. 8A is a perspective view and FIG. 8B is a connection cross-sectional view.
FIG. 9 is a connection pin of a fifth example, (a) is a perspective view, and (b) is a connection cross-sectional view.
FIG. 10 is a perspective view of a conventional bus bar manufacturing process.
[Explanation of symbols]
13 Bus-shaped bus bars 13A to 13D Bus bar 13-1, ... Bus bar pieces 14A to 14E Connection pin 14a Large diameter portion 14b Small diameter portion

Claims (6)

A connection structure of bus bars housed in an electrical junction box,
A strip-shaped bus bar with connection holes drilled at a constant pitch is cut to an appropriate length, and the cut bus bar pieces are combined and arranged in a predetermined pattern shape. While being stacked in multiple stages so as to match, there are provided connection pins that fit into and contact with corresponding connection holes in the upper and lower bus bar pieces, respectively. A bus bar connection structure comprising a diameter portion and a small diameter portion that is smaller in diameter than the connection hole and connects the large diameter portions to each other.   The bus bar connection structure according to claim 1, wherein the large-diameter portion of the connection pin has a spring portion that fits into the connection hole and comes into contact with the spring.   The bus bar connection structure according to claim 1, wherein the large-diameter portion of the connection pin has a tapered portion that press-fits and contacts the connection hole.   The bus bar connection structure according to claim 1, wherein the large-diameter portion of the connection pin is a nut in which a screw is formed at an end portion of the small-diameter portion and is screwed into the screw to sandwich the bus bar piece from above and below.   2. The bus bar connection structure according to claim 1, wherein the large-diameter portion of the connection pin has a widening portion that fits into the connection hole and widens and contacts.   2. The bus bar connection structure according to claim 1, wherein the large-diameter portion of the connection pin has a solder portion that fits into the connection hole and melts and contacts with heat.

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