JP2007215374A - Junction box for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a junction box for an automobile which allows a worker to easily change a circuit without bringing about a huge cost even if using it in combination for different types of vehicles, or even in the case that there has been a change in the circuit caused by its minor change, etc. <P>SOLUTION: In the junction box for the automobile which has a power system where fuse upstream wiring and fuse downstream wiring are connected with each other via a fuse, the upstream side of the fuse is composed of individual bus bars, and the downstream side of the fuse is composed of a tab terminal and a die-cut circuit, and the tab terminal and the die-cut circuit are connected with each other by free soldering, a press fitting method, micro-arc welding, or a solder robot. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automobile junction box.

  Conventionally, as a wiring medium for an automobile junction box (also referred to as an electrical junction box for automobiles), a bus bar (also referred to as a bus bar or the like) obtained by punching a copper-based material and performing a bending process or the like has been mainly used. (For example, refer to Patent Documents 1 to 5.)

In Patent Document 1, press-fitting pieces projecting from the width of the bus bar are provided at appropriate locations on both side edges of the bus bar constituting the conductive path, and the insulating substrate is wider than the width of the bus bar and between the press-fitting pieces on both side edges. While providing a groove having a narrower width than the outer method, providing a waste accommodating groove at a position corresponding to the press-fitting piece of the groove, press-fitting the press-fitting pieces on both side edges of the bus bar into the groove, and fixing the bus bar to the insulating substrate, There is disclosed a structure for fixing a bus bar and an insulating substrate so that shavings of the insulating substrate generated during press-fitting into the groove of the press-fitting piece can be accommodated in the waste accommodating groove.
In Patent Document 2, in a bus bar wiring board in which a plurality of bus bars having a desired pattern are arranged on an insulating substrate, the plurality of bus bars are selectively punched from two or more types of conductive metal plates having different conductivities. A bus bar wiring board is disclosed.
In Patent Document 3, several kinds of bus bars formed by punching and bending from a material into a shape forming an internal circuit are stacked at a desired interval by aligning the positions of the bridges of the bus bars in each layer without cutting the bridges, A method of manufacturing an electrical junction box is disclosed in which the stacked bus bars are collectively molded with an insulating material and then the bridges of the bus bars in each layer are cut.
In Patent Document 4, a bus bar circuit network board is formed by integrally punching a plurality of bus bars having a desired circuit pattern from a metal plate while leaving a connecting piece between adjacent bus bars, and the circuit network board is made of a synthetic resin insulator. After integrally molding with the above, the connecting piece is cut and removed, a tab press-fitting hole is opened at a desired position of the bus bar, and a tab for external connection is press-fitted into the tab press-fitting hole to form a bus bar circuit board. A method of manufacturing a bus bar circuit board is disclosed in which an adhesive resin is injected and filled into a cut and separated portion generated by cutting and removing a connecting piece, and a bus bar circuit board is laminated and fixed.
In Patent Document 5, bus bars having a plurality of desired patterns are arranged on a wiring board with a predetermined positional relationship, and each bus bar is formed with a necessary tab-like terminal by bending an end portion. When manufacturing a wiring board, by selecting adjacent bus bars that have a relationship in which the punching space cannot be used for pattern formation in order to interfere with each other when the tab-shaped terminals are in a developed state among a plurality of bus bars, Divide a plurality of bus bars into at least two non-interfering bus bar groups, and punch each fractionated bus bar group from a single conductive metal sheet, leaving a connection between the bus bars constituting the bus bar group. Are formed by forming the necessary tab-like terminals, and after separating the connection between the plurality of bus bars constituting each bus bar group, each separated Method of manufacturing a bus bar wiring board disposed on the wiring board in accordance with the predetermined positional relationship is disclosed a bus bar.
No. 7-47932 Japanese Patent No. 2503316 Japanese Patent No. 2555052 Japanese Patent No. 2561948 Japanese Patent No. 2733521

  As described above, bus bars for junction boxes for automobiles are conventionally manufactured by stamping and bending copper plates with a press, which requires enormous costs for equipment and mold production. There was a problem that enormous costs would be incurred when there was a change. In addition, due to such circumstances, sharing between different vehicle types is difficult.

  The present invention has been made in view of the above circumstances, and it is possible to easily change a circuit without incurring enormous costs even when the circuit is changed between different vehicle types or when there is a minor change. The purpose is to provide a junction box.

To achieve the above object, the present invention provides an automotive junction box having a power supply system in which a fuse upstream wiring and a fuse downstream wiring are connected via a fuse,
The fuse upstream is composed of individual bus bars, the fuse downstream is composed of tab terminals and punching circuits, and the tab terminals and punching circuits are connected by flow soldering, press-fit method, micro arc welding or soldering robot. A featured junction box for automobiles is provided.

  In the automobile junction box of the present invention, it is preferable that the joint portion of the circuit is formed by a joint connector separate from the junction box.

  The junction box for automobiles of the present invention has a fuse box upstream side and downstream side divided, the fuse downstream side is constituted by a punching circuit and a versatile tab, and the tab terminal and the punching circuit are flow solder, press Since it is configured to be connected by fit method, micro arc welding or soldering robot, even if the circuit is changed between different car models or minor changes, the circuit can be changed without incurring enormous costs. It can be done easily.

  The automobile junction box of the present invention is designed based on a power supply system diagram as shown in FIG. The power supply type of the junction box 1 can be divided into a fuse upstream wiring 2 and a fuse downstream wiring 4 with a mini-fuse 3 as a boundary. The fuse upstream has almost no change even if the model is different, and there is almost no change due to minor changes, while the fuse downstream has the characteristics that there are many differences between models and changes during minor changes. .

  Therefore, paying attention to this point, the upstream side of the fuse is changed from a conventional batch press method to an individual bus bar (generally called a vertical bus bar), and the downstream side of the fuse is manufactured by punching such as pressing. The combination of the circuit and the tab terminal. In this case, the tab terminal connected to the punched circuit on the board is not a dedicated product, and is designed to have versatility that can be used in other applications.

  FIG. 2 is an assembled perspective view showing an embodiment of an automobile junction box according to the present invention. The automobile junction box 10 of the present embodiment has a vertical bus bar 12 serving as a fuse upstream circuit between a housing 11 and a base 17, one end connected to the vertical bus bar 12 via a fuse, and the other end punched out. A number of vertically long thin plate-like fuse tabs 13 connected to the circuit 15, a punching circuit 15 partially embedded in an insulation plate 14 (hereinafter abbreviated as IP), and the lower surface side of the IP 14 And a large number of vertically long plate-like output tabs 16 whose one end side is connected to a predetermined position of the punching circuit 15, and a joint connector 18 separate from the automobile junction box 10 which forms a joint portion of the circuit. The structure is sandwiched between

  Examples of the material constituting the housing 11 and the base 17 include polyamide and polypropylene. The housing 11 and the base 17 can be manufactured by molding the material by an injection molding method or the like.

  The vertical bus bar 12 can be manufactured by combining a flat plate processed into a desired shape, an FF terminal, or the like. Note that a laminated bus bar may be used instead of the vertical bus bar 12.

As the fuse lower tab 13 and the output side tab 16, it is preferable to use general-purpose tab terminals such as a tuning fork terminal processed into a thin plate shape.
As the punching circuit 15, a brass plate, a heat-resistant copper alloy plate or the like punched into a desired shape is used.

  The IP 14 only needs to have sufficient insulating properties, and the material thereof is not particularly limited. However, when adopting a structure in which the punching circuit 15 is partially embedded in the IP 14 by hot pressing, a polypropylene resin, It is preferable to use IP14 made of a thermoplastic resin plate such as a polyester resin, a polyamide resin, or a polyimide resin.

  The joint connector 18 is not particularly limited, and can be appropriately selected from various joint connectors that have been conventionally known in the field of automobile junction boxes and the like.

  In the present embodiment, the fuse protrudes from the upper portion of the housing 11.

  The punching circuit 15 and the fuse lower tab 13 are connected by flow soldering. When a circuit change occurs between different car models or during a minor change, only the punching circuit portion on the downstream side of these fuses needs to be changed. Thus, the circuit can be changed without requiring enormous costs as in the case of newly designing and manufacturing the bus bar. As a result, not only can versatility be provided, but there is also an advantage that the degree of freedom in design increases.

As for the joint portion of the circuit, a separate joint connector 17 (J / C) may be attached as shown in FIG. 2, or it may be entirely covered in the punching circuit.
As for the connection between the punching circuit 15 and the fuse lower tab 13, a press-fit method, a micro arc method, or a solder robot may be used in addition to the solder.

  FIG. 3 is a cross-sectional view illustrating a connection method using solder. In this connection method, the fuse lower tab 13 protrudes on the back surface side of the punching circuit 15 or the output side tab 16 is set, and its tab terminal is shown. The flow solder 20 is disposed around the substrate, heated and melted, and then allowed to cool and solidify, and desired portions are connected by solder.

  FIG. 4 is a cross-sectional view illustrating a connection method using a press fit. In this connection method, a pilot hole as shown by reference numeral 23 in FIG. 5A is provided at a desired position of the punching circuit 15, and a press-fit terminal 22 having a spring property at the connection portion in the pilot hole 23. Is inserted and connected. Examples of the press-fit terminal 22 used for this include, but are not limited to, a square pin dimple star 24 shown in FIG. 5B and a round pin dimple star 25 shown in FIG. 5C.

  FIG. 6 is a cross-sectional view illustrating a connection method using micro arc welding. In this connection method, the fuse lower tab 13 is protruded on the back side of the punching circuit 15 or the output side tab 16 is set, and the micro arc 27 emitted from the micro arc welder 26 is applied to the tab terminal for welding and connection. To do.

  The junction box for automobiles according to the present invention has a fuse upstream side and a downstream side of the junction box, the fuse downstream side is constituted by a substrate and a tab terminal connected to the substrate, and the tab terminal and the punching circuit flow. Since it is configured to be connected by solder, press-fit method, micro arc welding or solder robot, even if there is a circuit change due to different car models or minor changes, without incurring enormous costs, The circuit can be easily changed.

It is the schematic of the power supply system of the junction box for motor vehicles of this invention. It is an assembly perspective view showing one embodiment of the junction box for cars of the present invention. It is sectional drawing which illustrates the connection system using solder. It is sectional drawing which illustrates the connection system using a press fit. It is a figure which illustrates a press fit terminal. It is sectional drawing which illustrates the connection system using micro arc welding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 ... Automotive junction box, 2 ... Fuse upstream wiring, 3 ... Mini fuse, 4 ... Fuse downstream wiring, 11 ... Housing, 12 ... Vertical bus bar, 13 ... Fuse bottom tab, 14 ... IP, 15 ... Punching Circuit: 16 ... Output side tab, 17 ... Base, 18 ... Joint connector, 20 ... Solder, 21 ... Press fit part, 22 ... Press fit terminal, 23 ... Pilot hole, 24 ... Square pin dimple star, 25 ... Round pin dimple Star, 26 ... micro arc welder, 27 ... micro arc.

Claims (2)

In an automobile junction box having a power supply system in which a fuse upstream wiring and a fuse downstream wiring are connected via a fuse,
The fuse upstream is composed of individual bus bars, the fuse downstream is composed of tab terminals and punching circuits, and the tab terminals and punching circuits are connected by flow soldering, press-fit method, micro arc welding or soldering robot. Features a junction box for automobiles. The junction box for an automobile according to claim 1, wherein a joint portion of the circuit is formed by a joint connector separate from the junction box.

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