JP2013150518A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box which can be made compact by utilizing the space below a bolt efficiently.SOLUTION: An electric connection box 1 includes a case 2, a bus bar 3 housed in the case 2, and a bolt 4 for holding a terminal 6 and the bus bar 3 attached to a first power supply line 5 with a nut 7. The bolt 4 is composed of a conductive material, and includes a shaft 41 being passed through bolt insertion holes 30, 60 provided in the terminal 6 and the bus bar 3, a head 42, and a wire connection 43 which is provided on the side of the head 42 opposite from the shaft 41 and can be connected with a second power supply line 8 by caulking the second power supply line 8. The wire connection 43 is arranged coaxially with the shaft 41, and formed cylindrically so as to house the core wire 81 of the second power supply line 8 internally.

Description

  The present invention relates to an electrical junction box mounted on an automobile.

  A variety of electronic devices are mounted on automobiles. In order to supply power and transmit signals to these various electronic devices, electrical junction boxes are arranged at appropriate locations in the automobile.

  FIG. 7 is an exploded view of a conventional electrical junction box. FIG. 8 is a sectional view of the electrical junction box shown in FIG. The electrical junction box 201 shown in FIGS. 7 and 8 includes a case 210 made of synthetic resin, and a bus bar 220 and a bolt block 230 assembled to the case 210.

  The case 210 is provided with sockets 213 and 214 for attaching fuses and fusible links on the upper surface thereof, and an opening 215 is provided between the sockets 213 and 214.

  The bus bar 220 is for supplying electric power to the sockets 213 and 214, and terminal groups 221 and 222 inserted into the sockets 213 and 214 are provided at the upper ends thereof. In addition, the bus bar 220 is provided with a terminal connection portion 223 that overlaps the terminal 206 connected to the power supply line 205 and is electrically connected to the terminal 206 at a position corresponding to the opening 215. The terminal connection portion 223 is formed in a plate shape, and is provided with a bolt insertion hole 223a through which a stud bolt 231 of a bolt block 230 described later is passed.

  The bolt block 230 is a synthetic resin block having a stud bolt 231 protruding from its upper surface, and a locking portion 240b for locking to the inner surface of the case 210 is provided on the side surface thereof. As shown by an arrow E, the bolt block 230 is inserted into the case 210 from below the case 210 and assembled to the case 210 so that the stud bolt 231 is passed through the bolt insertion hole 223a of the bus bar 220. Thus, it protrudes from the upper surface of the case 210. In addition, a locking lock 240 a that locks the locking portion 240 b of the bolt block 230 is provided on the inner surface of the case 210.

  In this electrical connection box 201, one end portion 261 of the terminal 206 connected to the power line 205 is overlaid on the terminal connection portion 223 exposed from the opening 215, and the nut 232 is screwed onto the stud bolt 231. The terminal 206 is fixed to the case 210 and the electrical connection state between the terminal 206 and the bus bar 220 is maintained (see Patent Document 1).

JP-A-6-276648

  The conventional electrical junction box 201 described above has the following problems. That is, in the conventional electrical junction box 201, the bolt block 230 is inserted into the case 210 from below the case 210 and assembled to the case 210. (F part in FIG. 8) became a dead space, and there was a problem that space efficiency was bad.

  Therefore, an object of the present invention is to provide an electrical junction box that can be miniaturized by efficiently using the space below the bolt.

  In order to achieve the above object, the invention described in claim 1 includes a case, a bus bar accommodated in the case, a terminal fixed to the case and attached to the first power line, and the bus bar as a nut. A bolt that is sandwiched between the bolt, the bolt is made of a conductive material, and the bolt is inserted into a bolt insertion hole provided in the terminal and the bus bar; An electrical connection box comprising: a head; and a wire connection portion provided on the opposite side of the head from the shaft portion and capable of being electrically connected to a second power line. It is.

  The invention described in claim 2 is the invention described in claim 1, wherein the electric wire connecting portion is disposed coaxially with the shaft portion and can accommodate the core wire of the second power supply line inside. It is characterized by being formed in a cylindrical shape.

  According to a third aspect of the present invention, in the first aspect of the present invention, the wire connecting portion extends from the head portion in the axial direction of the shaft portion and positions the second power line on the surface. And a core wire crimping piece for caulking the core wire of the second power supply line between the plate portion and the plate portion, and an insulating skin caulking piece for caulking the insulation skin of the second power supply line between the plate portion and the plate portion It is comprised by these, It is characterized by the above-mentioned.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein the case is provided with a bolt locking portion that locks the head of the bolt. It is characterized by that.

  The invention described in claim 5 is the invention described in any one of claims 1 to 3, further comprising a resin member attached to a head of the bolt, wherein the resin is attached to the case. A resin member locking portion for locking to the member is provided.

  According to the invention described in claim 1, the bolt is made of a conductive material, and the bolt is inserted into a bolt insertion hole provided in the terminal and the bus bar, and the head portion And an electric wire connection portion that is provided on the opposite side of the head portion from the shaft portion and can be electrically connected to the second power supply line. The space can be efficiently used as the wiring space for the second power supply line, and the electrical junction box can be downsized. In addition, conventionally, power from the first power supply line is supplied to the second power supply line via the bus bar. However, in the present invention, the second power supply line does not pass through the bus bar. As the size of the bus bar is reduced, the amount of heat generated by the bus bar (heat generated by the flow of a large current) is reduced.

  According to the invention described in claim 2, since the electric wire connecting portion is arranged coaxially with the shaft portion and is formed in a cylindrical shape capable of accommodating the core wire of the second power supply line on the inner side. The bolt and the second power supply line are in a straight line, and the wiring space for the second power supply line can be minimized.

  According to the invention described in claim 3, the wire connecting portion extends from the head portion in the axial direction of the shaft portion, and the plate portion for positioning the second power supply line on the surface thereof, and the plate portion Since it is composed of a core caulking piece for caulking the core wire of the second power supply line in between, and an insulating skin caulking piece for caulking the insulating skin of the second power supply line between the plate portions, The bolt and the second power supply line are in a straight line, and the wiring space for the second power supply line can be minimized.

  According to the invention described in claim 4, since the case is provided with a bolt locking portion for locking to the head of the bolt, the bolt can be directly assembled to the case, Can be easily assembled.

  According to the invention described in claim 5, since the resin member attached to the head of the bolt is further provided, and the case is provided with a resin member locking portion for locking to the resin member, the The bolt can be securely assembled to the case by the resin member.

It is a perspective view which shows the electrical junction box concerning the 1st Embodiment of this invention. It is a perspective view which shows the volt | bolt shown by FIG. It is sectional drawing along the AA line in FIG. It is a perspective view which shows the electrical-connection box concerning the 2nd Embodiment of this invention. It is a perspective view which shows the volt | bolt shown by FIG. It is sectional drawing along the BB line in FIG. It is an exploded view of the conventional electrical junction box. It is sectional drawing of the electrical-connection box shown by FIG.

(First embodiment)
The “electric connection box” according to the first embodiment of the present invention will be described with reference to FIGS.

  The electrical junction box 1 of the present invention is mounted on an automobile and supplies power and transmits signals to an electronic device mounted on the automobile. In the present invention, a junction block (also referred to as a junction box), a fuse block (also referred to as a fuse box), and a relay block (also referred to as a relay box) are collectively referred to as an electrical connection box.

  As shown in FIG. 1, the electrical junction box 1 of the present embodiment is fixed to the case 2 made of synthetic resin, the bus bar 3 accommodated in the case 2, and the case 2, and attached to the first power line 5. And a plurality of electronic components (not shown) such as relays, fuses, and connectors that are mounted on the case 2 and electrically connected to the bus bar 3. ing.

  The first power supply line 5 is an electric wire that supplies power from a power source such as a battery or an alternator to the bus bar 3 of the electrical connection box 1, and includes a core wire 51 and an insulating sheath 52 covering the core wire 51. ing.

  The terminal 6 includes a bus bar connection portion 61 that is electrically connected to the bus bar 3 by the bolt 4 and the nut 7, and a wire connection portion 65 that is attached to an end portion of the first power supply line 5. The bus bar connection portion 61 is formed in a circular plate shape in plan view, and is provided with a bolt insertion hole 60 through which the shaft portion 41 of the bolt 4 is passed. The electric wire connection portion 65 includes a plate portion 62 for positioning the first power supply line 5 on the surface, a pair of core wire crimping pieces 63 for caulking the core wire 51 of the first power supply wire 5, and an insulating sheath of the first power supply wire 5. And a pair of insulating outer caulking pieces 64 for caulking 52.

  The case 2 is provided with a bolt mounting portion 20 to which the bolt 4 is mounted and an electronic component mounting portion (not shown) to which a plurality of electronic components such as a relay, a fuse, and a connector are mounted. In FIG. 1, only a part of the case 2 is shown. The bolt mounting portion 20 is engaged with a surrounding wall 21 composed of four walls surrounding the bolt 4 and a head 42 of the bolt 4 inserted into the inside of the surrounding wall 21 from below the surrounding wall 21. And a pair of bolt locking portions 22 that support the bolt 4. One pair of bolt locking portions 22 is provided on each of two opposing walls of the surrounding wall 21. The pair of bolt locking portions 22 are formed in an elastically deformable arm shape and extend obliquely upward from the inner surface of the surrounding wall 21. The pair of bolt locking portions 22 support the bolt 4 by locking the tip portions thereof to the lower end of the head portion 42.

  The bus bar 3 branches the electric power inputted by being electrically connected to the terminal 6 connected to the first power supply line 5 to a plurality of electric wires (not shown) via electronic components such as a relay, a fuse, and a connector. The wiring member to be obtained is obtained by subjecting a metal plate to press working or the like. The bus bar 3 is positioned at the bolt mounting portion 20 and overlapped with the terminal 6 to be electrically connected to the terminal 6, and the electronic component mounting portion is positioned at the electronic component mounting portion such as a relay, a fuse, and a connector. An electronic component connecting portion (not shown) that is electrically connected to the electronic component is provided. Moreover, the terminal connection part 31 is formed in plate shape, and the bolt insertion hole 30 is provided. In FIG. 1, only a part of the bus bar 3 is shown.

  The said bolt 4 is comprised with the electroconductive material, and as shown to FIG.2, 3, the axial part 41 which passes along the bolt insertion holes 30 and 60 provided in the bus bar 3 and the terminal 6, and square plate shape And a wire connecting portion 43 provided on the opposite side of the head portion 42 from the shaft portion 41 and capable of being electrically connected to the second power supply line 8.

  The second power line 8 is an electric wire for supplying electric power from a power source to an electronic device mounted on an automobile, and includes a core wire 81 and an insulating sheath 82 covering the core wire 81. The second power supply line 8 is directly connected to the electric wire connection portion 43 without passing through electronic parts such as the bus bar 3, relays, fuses, and connectors.

  The electric wire connection portion 43 is disposed in the same axis as the shaft portion 41 and is formed in a cylindrical shape capable of accommodating the core wire 81 of the second power supply line 8 inside. The wire connecting portion 43 is electrically connected to the core wire 81 by caulking the core wire 81 by being deformed plastically by applying a force from the outside in a state where the core wire 81 of the second power supply line 8 is inserted inside. The

  Further, as shown in FIG. 3, the bolt 4 according to the present embodiment includes a shaft portion 41 and a head portion 42 that are integrally formed, and a wire connection portion 43 that is formed separately, and one end portion of the wire connection portion 43. 43a is welded to the head portion 42 to be integrated. In addition to this, the bolt of the present invention may be integrated by providing a caulking piece for caulking the other to one of the head 42 and the electric wire connecting portion 43 and caulking the caulking piece. Further, the bolt of the present invention may have a configuration in which the shaft portion 41, the head portion 42, and the electric wire connection portion 43 are integrally formed by casting, cutting, or the like.

  Such a bolt 4 is mounted on the bolt mounting portion 20 as shown by an arrow C in FIG. 1 from below the case 2, so that the shaft portion 41 is passed through the bolt insertion hole 30 of the bus bar 3. Projecting from the upper surface of the case 2. In addition, the bolt 4 fixes the bus bar connection portion 61 and the terminal connection portion 31 positioned between the nut 7 and the head portion 42 by screwing the nut 7 to the shaft portion 41 and also fixes the terminal 6 and the bus bar. 3 is maintained in electrical connection.

  Then, the assembly procedure of the electrical junction box 1 mentioned above is demonstrated. First, the bus bar 3 and a plurality of electronic components are assembled to the case 2. Next, the bolt 4 with the second power line 8 crimped is inserted into the surrounding wall 21 from below the case 2 as shown by an arrow C in FIG. Further, when the bolt 4 is mounted on the bolt mounting portion 20, the shaft portion 41 is passed through the bolt insertion hole 30 of the terminal connection portion 31. Next, the shaft portion 41 is passed through the bolt insertion hole 60 of the terminal 6 connected to the first power supply line 5, the bus bar connection portion 61 is overlaid on the terminal connection portion 31, and the nut 7 is screwed onto the shaft portion 41. Terminal 6 and bus bar 3 are electrically connected. The electrical junction box 1 is assembled through such a procedure.

  According to the present invention, the space S (see FIG. 1) below the bolt 4 that was a dead space in the past can be efficiently used as the wiring space for the second power supply line 8. Can be miniaturized. In addition, conventionally, the power from the first power supply line 5 is supplied to the second power supply line 8 via the bus bar 3, but in the present invention, the second power supply line 8 does not pass through the bus bar 3. The bus bar 3 is reduced in size, and the amount of heat generated by the bus bar 3 (heat generation due to the flow of a large current) is reduced.

  In addition, according to the present invention, the wire connecting portion 43 of the bolt 4 is arranged coaxially with the shaft portion 41 and is formed in a cylindrical shape capable of accommodating the core wire 81 of the second power supply line 8 inside. The bolt 4 and the second power supply line 8 are in a straight line, and the wiring space for the second power supply line 8 can be minimized.

(Second Embodiment)
An “electric connection box” according to a second embodiment of the present invention will be described with reference to FIGS. 4 to 6, the same components as those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, the electrical connection box 101 of the present embodiment is fixed to the case 102 made of synthetic resin, the bus bar 3 accommodated in the case 102, and the case 102, and is attached to the first power line 5. The bolt 104 that sandwiches the terminal 6 and the bus bar 3 between the nut 7, the resin member 9 that is attached to the head portion 142 of the bolt 104, and the relay, fuse, and connector that are attached to the case 102 and electrically connected to the bus bar 3 And a plurality of electronic components (not shown). Further, in FIG. 4, the first power supply line 5, the terminal 6, and the nut 7 are not shown, but these are the same as those described in the first embodiment (see FIG. 1). .

  The case 102 is provided with a bolt mounting portion 120 on which the resin member 9 with the bolt 104 attached is mounted, and an electronic component mounting portion (not shown) on which a plurality of electronic components such as relays, fuses, and connectors are mounted. ing. In FIG. 4, only a part of the case 102 is shown. The bolt mounting portion 120 is engaged with the surrounding wall 121 including four walls surrounding the resin member 9 to which the bolt 104 is attached, and the resin member 9 inserted into the inside of the surrounding wall 121 from below the surrounding wall 121. The resin member 9 and the pair of resin member locking portions 122 that support the bolts 104 are configured. One pair of resin member locking portions 122 is provided on each of two opposing walls of the surrounding wall 121. The pair of resin member locking portions 122 are formed in an elastically deformable arm shape and extend obliquely upward from the inner surface of the surrounding wall 121. The pair of resin member locking portions 122 support the resin member 9 and the bolt 104 by locking the tip portions thereof to the lower end of the resin member 9.

  The bus bar 3 has the same configuration as that of the first embodiment. In FIG. 4, only a part of the bus bar 3 is shown.

  The bolt 104 is made of a conductive material. As shown in FIGS. 5 and 6, a shaft portion 141 that passes through bolt insertion holes 30 and 60 provided in the bus bar 3 and the terminal 6, and a square plate shape. And a wire connection portion 143 that is provided on the opposite side of the head portion 142 from the shaft portion 141 and can be electrically connected to the second power supply line 8.

  The wire connection portion 143 extends from the head portion 142 in the axial direction of the shaft portion 141, and the core portion of the second power supply line 8 between the plate portion 144 and the plate portion 144 that positions the second power supply wire 8 on the surface. A pair of core wire caulking pieces 145 for caulking 81 and a pair of insulating skin caulking pieces 146 for caulking the insulating skin 82 of the second power supply line 8 between the plate portion 144.

  Moreover, as shown in FIG. 6, the bolt 104 of the present embodiment has a shaft portion 141 and a head portion 142 formed integrally, and a wire connection portion 143 formed separately, and one end portion of the wire connection portion 143. Are integrated with the head 142 by welding. In addition to this, the bolt of the present invention may be integrated by providing a caulking piece for caulking the other to one of the head 142 and the electric wire connecting portion 143 and caulking the caulking piece. Further, the bolt of the present invention may have a configuration in which the shaft portion 141, the head portion 142, and the wire connection portion 143 are integrally formed by casting, cutting, or the like.

  The resin member 9 is formed in a block shape from a synthetic resin. The resin member 9 is provided with a storage space in which the head 142 can be stored. Further, a cutout 92 for inserting the head 142 into the accommodation space is provided on the side surface of the resin member 9. Further, a cutout 91 through which the shaft portion 141 is passed is provided on the upper surface of the resin member 9. Further, a notch 93 through which the wire connecting portion 143 is passed is provided on the lower surface of the resin member 9.

  Then, the assembly procedure of the electrical junction box 101 mentioned above is demonstrated. First, the bus bar 3 and a plurality of electronic components are assembled to the case 102. Next, the resin member 9 is attached to the bolt 104 in a state where the second power line 8 is crimped, and the bolt 104 and the resin member 9 are inserted into the surrounding wall 121 from below the case 102 and attached to the bolt mounting portion 120. To do. Further, when the bolt 104 and the resin member 9 are mounted on the bolt mounting portion 120, the shaft portion 141 is passed through the bolt insertion hole 30 of the terminal connection portion 31. The electrical connection box 101 is assembled through such a procedure.

  According to the present invention, the space T (see FIG. 4) below the bolt 104, which was a conventional dead space, can be efficiently used as the wiring space for the second power supply line 8, and the electrical junction box 101 can be used. Can be miniaturized. Further, according to the present invention, the bolt 104 and the second power supply line 8 are in a straight line, and the wiring space for the second power supply line 8 can be minimized.

  In the first embodiment described above, the bolt 4 is directly fixed to the case 2, and in the second embodiment, the bolt 104 is fixed to the case 102 via the resin member 9. In the invention, the bolt 4 described in the first embodiment may be fixed to the case 2 via the resin member 9, and the bolt 104 described in the second embodiment is directly fixed to the case 102. It may be a configuration.

  In the first and second embodiments described above, the bolts 4 and 104 have the wire connection portions 43 and 143 that are electrically connected to the second power supply line 8 by caulking the second power supply line 8. However, the “wire connection portion” in the bolt of the present invention may be configured to be electrically connected to the second power supply line 8 by welding to the core 81 of the second power supply line 8. Alternatively, a pressure contact type having a blade that breaks through the insulating sheath 82 of the second power supply line 8 and contacts the core wire 81 may be used. Further, in the present invention, a male or female terminal fitting may be connected to the end of the second power supply line 8, and in that case, the “wire connecting portion” in the bolt of the present invention is the terminal fitting. It may be formed in a female or male shape that can be fitted.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1,101 Electrical connection box 2,102 Case main body 3 Bus bar 4,104 bolt 5 Power supply line 6 Terminal 7 Nut 8 Second power supply line 30,60 Bolt insertion hole 41,141 Shaft part 42,142 Head part 43,143 Electric wire Connection

Claims (5)

In an electrical junction box comprising: a case; a bus bar housed in the case; a terminal fixed to the case and attached to a first power supply line; and a bolt sandwiching the bus bar between the nuts;
The bolt is made of a conductive material, and the bolt is passed through a bolt insertion hole provided in the terminal and the bus bar, a head portion, and a side of the head opposite to the shaft portion. And an electric wire connecting portion capable of being electrically connected to the second power supply line. 2. The electrical connection according to claim 1, wherein the electric wire connection portion is disposed coaxially with the shaft portion and is formed in a cylindrical shape capable of accommodating the core wire of the second power supply line on the inner side. box. The wire connecting portion extends from the head portion in the axial direction of the shaft portion, and a core portion of the second power supply line is interposed between the plate portion and the plate portion positioning the second power supply line on the surface. The electrical connection box according to claim 1, comprising: a core wire crimping piece to be crimped; and an insulating skin crimping piece to crimp the insulating skin of the second power line between the plate portions. . The electric connection box according to any one of claims 1 to 3, wherein the case is provided with a bolt engaging portion that engages with a head portion of the bolt. A resin member attached to the head of the bolt;
The electrical connection box according to any one of claims 1 to 3, wherein the case is provided with a resin member locking portion that locks the resin member.

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