JP2005185036A - Bus bar structure, electric connection box having that structure, and process for forming bus bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain different types of bus bar easily and inexpensively. <P>SOLUTION: One and the other planar bus bar bodies 2 are provided with joints 10, 12, 16, 19, 21, respectively, a fusible part 5 and connecting parts 24-26 are provided at the intermediate part of the bus bar body, and a first bus bar 23 is formed by coupling the one and the other bus bar bodies through the fusible part and connecting parts. A second bus bar is formed by cutting off the connecting parts 24-26 and coupling the one and the other bus bar bodies 2 only through the fusible part 5. Alternatively, the fusible part 5 is not formed and the intermediate part of the bus bar body 2 may be used without the fusible part. The connecting parts 24 and 25 are formed on the opposite sides of the fusible part 5 and the connecting parts 25 and 26 are formed on the opposite sides of the bus bar body 2. An electric connection box having that bus bar structure is employed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bus bar structure in which different types of bus bars can be easily formed while being provided with a fuse, an electric junction box including the bus bar structure, and a method of forming the bus bar.

  FIGS. 7A and 7B show one form of a bus bar structure in a conventional electrical junction box.

  In this structure, the bus bars 71 and 72 having the same shape in FIGS. 7A and 7B are used, and the types and connection positions of the relay terminals 73 to 78 are changed, whereby the bus bars 71 and 72 and the fuse 79 are changed. The connection circuit form is changed.

  7 (a) and 7 (b), the bus bars 71 and 72 are arranged on a horizontal insulating plate 80, and a relay terminal 73 is commonly connected to a tab terminal on one end side of one bus bar 71. A tab terminal of the lower bus bar protrudes from the insulating plate 80, and a relay terminal 75 is commonly connected to the tab terminal.

  7A, one tab terminal of the lower bus bar protrudes from the insulating plate 80 adjacent to the relay terminal 73 on one end side, the relay terminal 74 is connected to the tab terminal, and the other bus bar 72 has An external contact piece 76 a of the joint relay terminal 76 is connected to the intermediate tab terminal 81, and the joint relay terminal 76 is connected to the other tab terminal protruding from the insulating plate 80 so as to face the intermediate tab terminal 81. Each fuse 79 is inserted and connected to each pair of relay terminals 73 to 76.

  5B, the joint relay terminal 76 is changed to a normal relay terminal 78, the connection with the intermediate tab terminal 81 is released, and the tab terminal 82 on one end side of the other bus bar 72 is joint relayed. A terminal 77 is connected to one tab terminal of the lower bus bar. Each fuse 79 is inserted and connected to each pair of relay terminals 73, 77, 75, 78.

By selectively using the two types of relay terminals 73 to 78 in this way, two types of circuit configurations can be obtained without cutting the bus bars 71 and 72 into different configurations. The electric junction box having the bus bar structure is mainly mounted on an automobile.
JP-A-5-83828 (pages 3 to 4, FIG. 5)

  However, the conventional structure is based on the premise that relay terminals 73 to 78 having different forms are used, and the fuse 79 must be a separate member from the bus bars 71 and 72. In addition, it takes time and labor to connect, and there is a problem that the cost of parts is high.

  For example, when two types of electric junction boxes are set for automobiles, such as for gasoline cars and diesel cars, fuses are required for circuits for gasoline cars, and fuses are not required for circuits for diesel cars. Even in such a case, it has been desired to manufacture the bus bar easily and at low cost.

  SUMMARY OF THE INVENTION In view of the above, the present invention provides a bus bar structure capable of easily forming a circuit including a fuse in a different form including a fuse with a bus bar at a low cost, an electric junction box having the bus bar, and a method for forming the bus bar. With the goal.

  In order to achieve the above object, the bus bar structure according to claim 1 of the present invention is provided with a connecting portion on one and the other of the plate-like bus bar main body, and the fusible portion is connected to an intermediate portion of the bus bar main body. A portion is provided, and one and the other of the bus bar body are connected by the fusible portion and the connecting portion.

  With the above-described configuration, energization is performed from one connecting portion of the bus bar body to the other connecting portion through the intermediate connecting portion, and the fusible portion does not particularly act as a fuse, and mainly the one of the bus bar main body at the connecting portion. Conduction between the other is performed. The connecting portion also functions as a reinforcing portion and a soluble portion protecting member of the bus bar body. The bus bar structure is used, for example, for a diesel engine vehicle. By cutting and removing the connecting portion, it can be used as another bus bar.

  A bus bar structure according to a second aspect is the bus bar structure according to the first aspect, wherein the connecting portion is formed wider than the fusible portion.

  With the above configuration, it is possible to prevent the current from being concentrated on the connection portion having a low resistance and the soluble portion from being cut.

  The bus bar structure according to claim 3 is characterized in that, in the bus bar structure according to claim 1 or 2, the connecting portion is cut, and one and the other of the bus bar main bodies are connected only by the soluble portion. .

  With the above configuration, energization is performed from one connection portion of the bus bar body to the other connection portion through the intermediate soluble portion, and when the excessive current is applied, the soluble portion is heated and cut as a fuse, and is connected to the other connection portion. Power is cut off. The said bus-bar structure can be easily obtained by cutting and removing the connection part in the bus-bar structure of Claim 1 or 2. The bus bar according to claims 1 and 2 and the bus bar according to claim 3 are molded in the same mold by attaching and detaching the insert piece for forming the fusible part and the insert piece for cutting the connecting part to the mold. .

  The bus bar structure according to claim 4 is characterized in that, in the bus bar structure according to claim 1, the soluble portion is not formed, and the intermediate portion of the bus bar main body is used without the soluble portion.

  With the above configuration, the process of punching and forming the fusible portion with a punch, a die, or the like is unnecessary, and the bus bar structure is simplified and reduced in cost. When a bus bar that requires a fusible part is made from this bus bar, the fusible part or the fusible part and the connecting part are simultaneously punched and formed by a punch or a die.

  The bus bar structure according to a fifth aspect is the bus bar structure according to the first or second aspect, wherein the connecting portion is formed on both sides of the soluble portion.

  By the said structure, a soluble part is safely protected from the interference with the exterior etc. by the connection part of both sides. When the bus bar is used vertically, the fusible part is preferably located in the transverse direction, and the connecting part is preferably located close to the upper and lower parts of the fusible part.

  The bus bar structure according to a sixth aspect is the bus bar structure according to any one of the first, second, and fifth aspects, wherein the connecting portions are formed on both sides of the bus bar main body.

  With the above configuration, the rigidity of the bus bar main body is increased by the connecting portion, and the bending deformation of the bus bar main body is prevented and the wearability is improved. Any of the connecting portions on both sides of the bus bar body and the connecting portions on both sides of the fusible portion may be common.

  An electrical junction box according to a seventh aspect includes the bus bar structure according to any one of the first to sixth aspects.

  With the above configuration, the bus bar is accommodated in the electrical junction box, the circuit on the power source side is connected to one connection part of the bus bar main body, and the electrical part such as a fuse or the like from the other connection part via the fusible part or the connecting part. Power is supplied to the bus bar or other circuit.

  The bus bar forming method according to claim 8 is formed by punching a conductive metal plate to form a connecting portion on one side and the other side of the bus bar main body, and forming a soluble portion and a connecting portion at an intermediate portion of the bus bar main body. A first bus bar is configured, and the connecting portion of the first bus bar is cut to form a second bus bar having the soluble portion.

  With the above-described configuration, energization is performed from one connecting portion of the bus bar body to the other connecting portion through the intermediate connecting portion, and the fusible portion does not particularly act as a fuse, and mainly the one of the bus bar main body at the connecting portion. Conduction between the other is performed. The connecting portion also functions as a reinforcing portion and a soluble portion protecting member of the bus bar body. The first bus bar is used, for example, for a diesel engine vehicle. By cutting and removing the connecting portion, it can be used as the second bus bar. In the second bus bar, energization is performed from one connection part of the bus bar body to the other connection part through the intermediate soluble part, and when the excessive current is applied, the soluble part is heated and cut as a fuse, and the other connection The power to the part is cut off. The first and second bus bars are molded with the same mold by attaching and detaching the insert piece for forming the fusible part and the insert piece for cutting the connecting part to the mold.

  A bus bar forming method according to claim 9 is the bus bar forming method according to claim 8, wherein the first bus bar is configured without forming the soluble portion.

  With the above configuration, the process of punching and forming the fusible portion with a punch, a die, or the like is unnecessary, and the bus bar structure is simplified and reduced in cost. When a bus bar that requires a fusible part is made from this bus bar, the fusible part or the fusible part and the connecting part are simultaneously punched and formed by a punch or a die.

  According to the invention described in claim 1, by using the connecting portion as the energizing portion of the bus bar main body, one type of bus bar can be configured, and by removing the connecting portion by cutting and removing the other types of bus bars, It can be formed at low cost.

  According to the second aspect of the present invention, in the bus bar structure in which the fusible part does not need to act as a fuse, the fusible part can be prevented from being blown and generation of unnecessary cutting residue or the like can be eliminated.

  According to invention of Claim 3, the bus bar of a different form can be obtained at low cost by simple operation which only cut | disconnects the connection part in the bus-bar structure of Claim 1 or 2.

  According to invention of Claim 4, since the effort which forms a soluble part can be saved, another kind of bus bar can be formed easily and at low cost.

  According to invention of Claim 5, since a soluble part is safely protected from the interference with the exterior etc. by the connection part of both sides, conveyance and handling of a bus-bar are facilitated.

  According to the sixth aspect of the present invention, the rigidity of the bus bar body is increased by the connecting portion, so that bending deformation of the bus bar body is prevented and the mounting property in the electrical junction box is improved.

  According to the seventh aspect of the present invention, an electric junction box having different types of bus bars can be manufactured easily and at low cost.

  According to the eighth aspect of the present invention, the first bus bar can be configured by using the connecting portion as the energizing portion of the bus bar main body, and the second of the different forms can be obtained by simply operating the connecting portion. The bus bar can be formed easily and at low cost.

  According to invention of Claim 9, since the effort which forms a soluble part can be saved, the 1st bus bar can be formed easily and at low cost.

  FIG. 1 shows an embodiment of a bus bar according to the present invention, and FIG. 2 shows a bus bar assembly in which the bus bar is assembled and integrated with another bus bar.

  A bus bar (second bus bar) 1 shown in FIG. 1 is mounted on an electric connection box 20 (FIG. 1) of a gasoline engine vehicle, and supplies power to a relay in the electric connection box and a wire harness following the electric connection box 20. A notch 4 in the width direction of the plate is provided in the central plate portion 3 of the flat bus bar body 2, and a fusible portion (fuse or blocking portion) 5 crosses the notch 4. The plate portion 3 is formed integrally with the same plane.

  The right half and the left half of the bus bar main body 2 are divided into two by the notch 4 and are connected only by the soluble part 5. The fusible part 5 is formed in a narrow width, extends obliquely from above to below in the lower half of the central plate part 3, and continues on the same plane substantially perpendicular to both end faces 4 a of the notch part 4. The notch portion 4 is composed of a middle width portion 4a 'in the lower half, a wide portion 4b at the center, and a narrow portion 4c on the upper side. The shape of the notch 4 can be set as appropriate. The bus bar body 2, the terminal portions 10, 12, 16, 19, the cutout portion 4, and the soluble portion 5 are formed by punching from a single conductive metal plate.

  In this example, holes 6 for connection to an external (retrofitted) fuse (not shown) are provided on both sides of the central wide portion 4b. The external fuse allows only the fuse to be installed without replacing the bus bar 1 after the fusible portion 5 is melted. The hole 6 functions not only as an external fuse but also as a connection portion for a power line from an alternator (not shown) and a terminal with an electric wire for external connection.

  As shown in FIG. 2, the central plate portion 3 of the bus bar 1 of the present example bulges outward from the other bus bar main body portion 2 via the step portion 7, and the nut 8 (FIG. 1) is placed in the inner space. The external fuse can be fastened and fixed with bolts. In FIG. 1, reference numeral 9 denotes a protrusion for preventing rotation with respect to a terminal with a wire for external connection (round plate terminal).

  A plurality of thick tab terminals (connecting portions) 10 are integrally formed on the upper right half of the bus bar 1, and at the right end of the bus bar 1 are bent tabs 11 that are orthogonal to each other and further wider tab terminals (connecting portions). 12 is integrally formed. For example, a terminal with a positive-side wire from a battery is connected to the right-side tab terminal 12, and the upper tab terminal 10 is connected to the tab terminal of the other bus bar 14 (FIG. 2) via a fusible link 13 (FIG. 1). 15 is connected. Each tab terminal 10, 15 is formed so as to protrude in the same plane as the flat portion of the bus bar body 2. In FIG. 1, reference numeral 29 denotes a fixing hole for the other bus bar 14.

  A plurality of tuning-fork-shaped clamping terminals (connection portions) 16 are formed to protrude at an equal pitch on the upper left half of the bus bar 1, and the plate portion 17 on the left end side of the bus bar body 2 is located inside via a step portion 18. The plate portion 17 is provided with a tab terminal (connection portion) 19 and a hole portion (connection portion) 21 for connecting a terminal with electric wires. The terminals 16 and 19 are formed so as to protrude on the same plane as the plate-like bus bar bodies 2 and 17. In FIG. 1, reference numeral 22 denotes a projecting piece for preventing the terminal with electric wire from rotating.

  FIG. 3 shows a power supply bus bar 23 attached to an electric junction box for a diesel engine vehicle as another embodiment of the bus bar according to the present invention. This bus bar (first bus bar) 23 is a stage before the formation of the central cutout 4 in the process of manufacturing the bus bar 1 for a gasoline vehicle shown in FIG. 1, and is formed during the same manufacturing process. .

  The fusible part 5 is already formed in the central plate part 3 of the bus bar 23, and the left half part and the right part of the bus bar 23 are formed by the connecting parts 24, 25 close to the upper and lower parts of the soluble part 5 and the connecting part 26 at the upper end of the plate part. The half is connected together. The fusible part 5 is located inside the vertically long rectangular hole 27, a wide hole part 28 is located above the hole part 27, and the wide hole part 28 follows the narrow part 28 a on the upper side. Yes. Both hole portions 27 and 28 are surrounded by three horizontal connecting portions 24-26. The connecting portion 25 below the fusible portion also serves as a connecting portion on the lower end side of the plate portion 3. Each of the connecting portions 24 to 26 is formed wider than the fusible portion 5, and current is concentrated and supplied with a resistance lower than that of the fusible portion 5.

  The fusible portion 5 is protected from interference with the outside by the connecting portions 24 and 25 on both the upper and lower sides of the fusible portion 5 during transportation of the bus bar 23 or when assembled to the electrical junction box. Further, the rigidity of the bus bar body 2 is enhanced by the connecting portions 25 and 26 at both the upper and lower ends of the plate portion 3, and bending deformation of the bus bar 23 is prevented.

  It is preferable to prevent external interference of the fusible part 5 by cutting and removing the connecting parts 24 to 26 immediately before the bus bar 1 (FIG. 1) for the gasoline vehicle is assembled in the electric junction box. It is preferable to cut the connecting portions 24 to 26 by punching and dicing. The cutting width of the connecting portions 24 to 26 can be set as appropriate, for example, to be the same as or narrower than the width of the hole portions 27 and 28. Since the configuration is the same as that of the bus bar 2 for a gasoline vehicle except that the connecting portions 24 to 26 are provided, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 4 shows a bus bar 30 in a previous stage for forming the fusible portion 5 on the bus bar of FIG. 3, and this bus bar 30 can also be used as a bus bar for a diesel vehicle in place of the bus bar 23 of FIG.

  The fusible portion 5 of the bus bar 23 in FIG. 3 is formed simultaneously with the hole 27 by a punching punch, and the bus bar 30 in FIG. 4 is formed by omitting the punching punch (inserting piece). However, since it is troublesome to remove the insert piece one by one, the bus bar 23 integrally formed with the fusible part 5 of FIG. 3 is used for a diesel vehicle, and only the connection parts 24 to 26 of the bus bar 23 of FIG. 3 are cut. It is preferable to obtain one bus bar 1 for a gasoline vehicle. Since the fusible part 5 in FIG. 3 is energized by the connecting parts 24 to 26, it does not function as a fuse.

  The bus bar 30 in FIG. 4 is the same as the bus bar 23 in FIG. 3 except that the hole 27 and the fusible portion 5 are not provided. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted. The configuration shown in FIGS. 1, 3 and 4 is also effective as a bus bar forming method.

  As shown in FIG. 2 (represented by the bus bar 1 in FIG. 2), the power supply bus bars 1, 23, 30 of this example are assembled to face the insulating array bus bar 14 and used as the bus bar assembly 31. The

  As shown in FIG. 5, the insulating array bus bar 14 includes a plurality of strip-shaped bus bar main bodies 32 and an insulating resin portion 33 that covers the bus bar main body 32, and terminal portions 34 to 40 of the bus bar main body 32 protrude vertically. The upper terminal portions 34 to 36 are located opposite to the upper terminal portions 10, 16, and 19 of the power supply bus bar 1 (FIG. 2), and the lower terminal portions 37 to 40 are from the power supply bus bar 1. Is also projected downward.

  In FIG. 5, reference numeral 34 denotes a fusible link connection tab terminal, 35 denotes a fuse connection holding terminal, and 37 to 40 denote connector connection tab terminals. In FIG. 2, the power supply bus bar 1 is fixed by heat caulking with the tip of the protrusion 41 (FIG. 5) of the insulating resin portion 33 engaged with the hole 29 (FIG. 1) of the bus bar body 2.

  The use of the power supply bus bar 1 in an integrated manner with the insulating array bus bar 14 is merely an example, and the power supply bus bar 1 can be used alone or arranged in an electrical connection field in parallel with other bus bars.

  As shown in FIG. 6, the bus bar assembly 31 is joined to a lower synthetic resin connector block (under cover) 42, and the lower terminal portions 37 to 40 of the insulating array bus bar 14 are connected to the respective holes of the connector block 42. The connectors 44 to 47 are inserted into the connector housings 48 to 51 to constitute the connectors. Each of the connector housings 48 to 51 is formed integrally with a horizontal base wall 52 in the longitudinal direction of the connector block 42. The bus bar assembly 31 is mounted in the main cover (junction box body) 53 together with the connector block 42 and is positioned vertically (vertically placed).

  The tab terminals 10, 15, 19, 36 of the right half upper side and the left end of each bus bar 1, 14 are positioned in the housing (fusible link) mounting portion 54 at the upper part of the main cover, and the left half upper clamping terminal 16 and 35 are located in a housing (fuse mounting portion) 55 at the upper part of the main cover, the fusible link 13 for large current is mounted on the fusible link mounting portion 54, and the small current fuse 56 is mounted on the fuse mounting portion 55. Is done.

  A tab terminal 12 having a large width at the right end of the power supply bus bar 1 is accommodated in a connector housing 57 in the main cover 53 to form a connector, and a power line from a battery, for example, is connected to the connector. The central plate portion 3 of the power supply bus bar 1 is located in the central opening 60 of the main cover 53. In addition, a relay 58 is attached to the main cover 53 together with a holder 59.

  A connector of a wire harness (not shown) is connected to the connector block 42 from below, and the wire harness is led out through an opening of a lower cover (not shown). An upper cover (not shown) is mounted on the main cover 53. The main cover 53, the bus bar assembly 31, the connector block 42, the electrical components such as the fuses 13, 56 and the relay 58, the upper cover, and the lower cover constitute the electrical junction box 20. 6 is merely an example, and the power supply bus bars 1, 23, and 30 according to the present invention can be used for electrical connection boxes of various circuit forms alone or in combination with other bus bars. .

It is a front view which shows one Embodiment of the bus-bar in this invention. It is a perspective view which shows the example which assembles and uses a bus bar with another bus bar. It is a front view which shows other embodiment of the bus-bar in this invention. It is a front view which shows other embodiment of the bus bar in this invention. It is a perspective view which shows the other bus bar in FIG. It is a disassembled perspective view which shows one Embodiment of the electrical-connection box containing a bus-bar assembly. (A) (b) is a disassembled perspective view which shows one form of the conventional bus-bar structure.

Explanation of symbols

1 Busbar (second busbar)
2 Busbar body 5 Fusible part 10, 12, 19 Tab terminal (connection part)
16 Nipping terminal (connection part)
20 Electrical connection box 21 Connection hole (connection part)
23, 30 bus bar (first bus bar)
24-26 connecting part

Claims (9)

  A connecting portion is provided on one and the other of the plate-shaped bus bar main body, a soluble portion and a connecting portion are provided in an intermediate portion of the bus bar main body, and the soluble portion and the connecting portion of the bus bar main body A bus bar structure in which one and the other are connected.   The bus bar structure according to claim 1, wherein the connecting portion is formed wider than the fusible portion.   The bus bar structure according to claim 1 or 2, wherein the connecting portion is cut and one and the other of the bus bar main bodies are connected only by the soluble portion.   The bus bar structure according to claim 1, wherein the fusible part is not formed and an intermediate part of the bus bar main body is used without the fusible part.   The bus bar structure according to claim 1, wherein the connecting portion is formed on both sides of the soluble portion.   The bus bar structure according to claim 1, wherein the connecting portion is formed on both sides of the bus bar main body.   An electrical junction box comprising the bus bar structure according to any one of claims 1 to 6.   A conductive metal plate is punched to form a connecting portion on one and the other side of the bus bar body, and a fusible portion and a connecting portion are formed at an intermediate portion of the bus bar body to form a first bus bar. A method of forming a bus bar, comprising: cutting the connecting portion of the bus bar to form a second bus bar having the fusible portion.   The bus bar forming method according to claim 8, wherein the first bus bar is configured without forming the fusible portion.

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