JP5132425B2 - Processing method of electrical connection parts - Google Patents

Description

  The present invention relates to a method for processing an electrical connection component such as an electrical connection box, and more particularly to a method for processing an electrical connection component formed by insert molding a bus bar.

  There are various types of electrical connection parts such as electrical connection boxes. One of them is a type formed by insert molding of conductive elements (circuit elements) such as bus bars and terminals into a resin housing. is there. FIG. 5 shows a configuration example of an insert molding type electric junction box. In the electrical connection box 1 of this example, conductive elements such as bus bars 4 (bus bars 4a, bus bars 4b, etc.) and terminals 5 are assembled by insert molding in an insert portion 3 in a resin housing 2. A part of the bus bar 4a and the bus bar 4b is exposed at the window 6 (the window 6a, the window 6b, etc.) provided in the insert part 3. In addition, the electrical connection box 1 is provided with a fitting / mounting portion 7, and a retrofit bus bar 8 is assembled to the fitting / mounting portion 7 as a non-insert retrofit conductive element by fitting and mounting.

  In such an insert-molded type electric junction box 1, a plurality of bus bars 4 to be inserted are connected by a connecting portion to form a bus bar unit, and insert molding is performed using the bus bar unit as an insert member. Of the connecting portions in the unit, cutting unnecessary for the circuit, that is, unnecessary connecting portions, is cut to cut the connection.

  FIG. 6 shows the relationship between the unnecessary connecting portion 9 to be cut and the bus bar 4, corresponding to the portion surrounded by the one-dot chain line in FIG. 5, and FIGS. 7 and 8 showing the unnecessary connecting portion. It is a mode that 9 is cut | disconnected by the diver cut construction method. In the diver cutting method, cutting is performed using a die 10 and a punch 11. For this purpose, the insert portion 3 of the housing 2 is provided with a die window portion 12 on the back surface side corresponding to the unnecessary connecting portion 9 and a cutting window portion 13 on the front surface side. A die 10 is set on the die window portion 12 so as to support the back surface of the unnecessary connection portion 9, while the cutting window portion 13 corresponds to the cutting portion 14 of the unnecessary connection portion 9 in FIG. Thus, the punch 11 is set (FIG. 7A). In this state, the punch 11 is lowered to cut the unnecessary connecting portion 9 at the cutting portion 14 (FIGS. 7B and 8).

  As for electrical connection parts such as an electrical connection box in which a bus bar is used as a conductive element, examples disclosed in Patent Literature 1 and Patent Literature 2, for example, are known, and an insert molding type in which a bus bar is incorporated by insert molding is disclosed in Patent Literature. The example disclosed in 3 is known.

JP 2000-224733 A JP 2001-223459 A JP 2004-32911 A

  By the way, the unnecessary connection part cut | disconnected as mentioned above will be in the state which left the connection part cutting piece 15 as shown in FIG.8 and FIG.9, and this connection part cutting piece 15 is in the window part 13 for cutting. It will be in a state of being greatly exposed. In this case, there exists a problem about the insulation between the connection part cutting piece 15 and the retrofit bus bar 8 (FIG. 1, FIG. 8) adjacent to this. That is, since the connecting portion cutting piece 15 is largely exposed from the resin of the housing in the cutting window portion 13, it is necessary to provide sufficient insulation between the connecting portion cutting piece 15 and the retrofit bus bar 8. It is necessary to ensure the spatial distance D, which is a problem that the arrangement of the bus bar 4 and the retrofit bus bar 8 becomes a restriction. Such a problem is a non-negligible problem for an electrical connection component such as an electrical junction box that is increasingly required to have a high density, and is between the connecting piece 15 and the adjacent conductive element. It is desirable to make the space distance to be secured as short as possible.

  The present invention has been made to meet such demands, and the problem is that a spatial distance to be ensured between a connecting portion cutting piece generated by cutting an unnecessary connecting portion and a conductive element adjacent thereto is ensured. An object of the present invention is to provide a method of processing an electrical connection component that can be made shorter.

  In the present invention, in order to solve the above-mentioned problem, a bus bar unit formed by connecting a plurality of bus bars at a connecting portion is formed by insert molding in a resin housing, and after the insert molding, the connecting portion of the bus bar unit is formed. In the method of processing an electrical connection component, in which an unnecessary connecting portion that is unnecessary in terms of a circuit is cut to cut off the connection, the insert molding is performed on an unnecessary connecting portion to be cut. The surface is covered with the resin of the housing, and the cutting process is performed by cutting the unnecessary connecting portion together with the resin of the surface coating.

  According to such a processing method, since the surface of the unnecessary connection part to be cut is covered with the resin of the housing, the unnecessary connection part is cut together with the resin of the surface coating. The exposure of the cut piece from the resin can be suppressed as much as possible. For this reason, it is possible to increase the creepage distance between the connecting piece cutting piece and the conductive element adjacent thereto, thereby increasing the insulation, and thus securing between the connecting piece cutting piece and the adjacent conductive element. It is possible to further reduce the spatial distance to be increased, and to increase the degree of freedom with respect to the arrangement of the conductive elements such as bus bars in the electrical connection parts.

  According to the present invention as described above, it is possible to further shorten the spatial distance to be ensured between the connecting portion cutting piece generated by cutting the unnecessary connecting portion and the conductive element adjacent thereto.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 shows a configuration of an electrical connection box 21 that is an insert-molded type electrical connection component obtained by a method of processing an electrical connection component according to an embodiment. The electrical connection box 21 is basically the same as the electrical connection box 1 shown in FIG. 5, and only differs in cutting unnecessary connection portions. Therefore, about the structure which is common with the electrical junction box 1, the same code | symbol as in FIG. 5 is attached | subjected and shown, and the above description shall be used.

  2 and 3 show a state where the unnecessary connecting portion 9 is cut by the diver cut method after the insert molding. The insert of the unnecessary connecting portion 9 is made to be covered with a resin layer 22 made of resin in the insert portion 3 of the housing 2 on the front surface, and the die window portion 23 is opened on the back surface.

  Cutting the unnecessary connecting portion 9 inserted in this way by the diver cutting method sets the die 24 in the die window portion 23, and positions the surface of the unnecessary connecting portion 9 so as to correspond to the position of the die 24. The punch 25 is set with the layer 22 interposed (FIG. 2A), and the punch 25 is lowered in this state to cut the unnecessary connecting portion 9 together with the surface coating resin layer 22 (FIG. 2B). )).

  By such cutting, a cutting hole 26 is formed in the surface coating resin layer 22, and a cutting portion 27 is formed in the unnecessary connecting portion 9, and connecting portion cutting pieces 28 are generated on both sides thereof (FIGS. 3 and 4). In this case, the connection part cutting piece 28 is in a state where almost the entire surface is covered with the surface coating resin layer 22, and the connection part cutting piece 28 can be prevented from being exposed from the resin as much as possible. For this reason, the creeping distance between the connecting portion cutting piece 28 and the retrofitted bus bar 8 adjacent thereto can be increased and the insulation can be improved. Therefore, the space to be secured between the connecting portion cutting piece 28 and the retrofit bus bar 8. The distance can be further shortened, and the degree of freedom regarding the arrangement of the bus bar 4 and the retrofit bus bar 8 can be increased.

  Here, the dice window portion 23 is formed in a size larger than the dice window portion 12 in FIG. 7 described above. This makes it possible to use a die 24 having a size larger than that of the die 10 in FIG. 7, thereby improving the durability of the die.

  As mentioned above, although the form for implementing this invention was demonstrated, this is only a representative example and this invention can be implemented with various forms in the range which does not deviate from the meaning. For example, in the above embodiment, the surface coating resin layer of the unnecessary connection portion is formed on the entire surface of the unnecessary connection portion, but the present invention is not necessarily limited thereto. In other words, when the surface of the unnecessary connecting portion is covered with the surface coating resin layer, it is sufficient that the surface covering resin layer covers the surface of the unnecessary connecting portion so that the unnecessary connecting portion can be cut together with the surface coating resin layer. It is not always necessary to be covered.

It is a figure which simplifies and shows the structure of the electrical connection box obtained by the processing method of the electrical connection components by one Embodiment. It is a figure which simplifies and shows a mode that an unnecessary connection part is cut | disconnected by a diver cut construction method. It is a figure which simplifies and shows the state which finished the cutting | disconnection of the unnecessary connection part. It is a figure which simplifies and shows the planar view state of a connection part cutting piece. It is a figure which simplifies and shows the structure of the electrical connection box obtained by the processing method of the conventional electrical connection components. It is a figure which simplifies and shows the relationship between a connection part and a bus bar in a planar view state. It is a figure which simplifies and shows a mode that an unnecessary connection part is cut | disconnected by a diver cut construction method. It is a figure which simplifies and shows the state which finished the cutting | disconnection of the unnecessary connection part. It is a figure which simplifies and shows the planar view state of a connection part cutting piece.

Explanation of symbols

2 Housing 4 Bus bar 9 Unnecessary connection part 21 Electrical connection box (electrical connection parts)
22 Surface coating resin layer

Claims (2)

A bus bar unit formed by connecting a plurality of bus bars at a connecting portion is formed by insert molding into a resin housing,
In the method of processing an electrical connection component, in which cutting is performed to disconnect the unnecessary connection portion that is unnecessary in terms of circuit among the connection portions in the bus bar unit after the insert molding,
The insert molding is performed such that the surface of the unnecessary connection part to be cut is covered with the resin of the housing, and the cutting process cuts the unnecessary connection part together with the resin of the surface coating. A method of processing an electrical connection component, characterized by being made in A bus bar unit formed by connecting a plurality of bus bars at a connecting portion is formed by insert molding into a resin housing,
An electrical connection part adapted to be cut to disconnect the unnecessary connection part that is unnecessary in terms of the circuit in the connection part in the bus bar unit after the insert molding,
Of one unnecessary connection part separated after the cutting process, an uncovered part that is not covered with the resin of the housing;
Of the one unnecessary connection part separated after the cutting process, a covering part covered with the resin of the housing,
A conductive element that is not the other unnecessary connection part separated after the cutting process, and is an adjacent conductive element that is a conductive element located at a distance closest to the one unnecessary connection part,
The electrical connection component, wherein the resin of the housing is located on a straight line connecting every portion of the uncovered portion and the adjacent conductive element.

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