JP2014230328A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box capable of improving rigidity of a wiring board.SOLUTION: An electric connection box 1 comprises: a plurality of low-voltage bus bars 2 and high-voltage bus bars 3; a synthetic resin wiring board 4 on which the plurality of bus bars 2 and 3 are laid; and a synthetic resin cover 5 covering the plurality of bus bars 2 and 3. At a side of the cover 5 opposite to the wiring board 4, electronic component mounting parts 7-10 are provided to which electronic components such as a fuse, a relay 12 and a connector of a wire harness are mounted. The wiring board 4 includes a low-voltage bus bar wiring surface 42 on which the low-voltage bus bar 2 is laid and a high-voltage bus bar wiring surface 43 on which the high-voltage bus bar 3 is laid. The low-voltage bus bar wiring surface 42 is positioned closer to the cover 5 than the high-voltage bus bar wiring surface 43.

Description

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

  There are various types of electrical connection boxes mounted on automobiles, for example, there are structures having a wiring board and a bus bar shown in FIGS. 9 and 10 (see, for example, Patent Document 1). FIG. 9 is a perspective view of a wiring board and a bus bar constituting a conventional electric junction box. 10 is a cross-sectional view taken along the line DD in FIG.

  Reference numerals 304 in FIGS. 9 and 10 are routing boards made of synthetic resin, reference numeral 302 is a low-pressure bus bar, and reference numeral 303 is a high-pressure bus bar. A voltage of 12V is applied to the low voltage bus bar 302, and a voltage higher than that of the low voltage bus bar 302 is applied to the high voltage bus bar 303.

  The low-pressure bus bar 302 and the high-pressure bus bar 303 are bent at right angles from the routing portions 321 and 331 routed along the bottom surface 340 of the routing plate 304 formed in a shallow box shape. A raised connection 322, 332 is provided. The connection portions 322 and 332 constitute an electronic component mounting portion on which electronic components such as fuses, relays, and connectors are mounted.

  The routing board 304 is provided with ribs 342 and 343 erected from the bottom surface 340. These ribs 342 and 343 are for positioning the low-pressure bus bar 302 and the high-pressure bus bar 303 and insulating between adjacent bus bars. Further, the height of the ribs 342 and 343 from the bottom surface 340 needs to be a height corresponding to the voltage value of the bus bar to be insulated, and the rib 343 for insulating the high-voltage bus bar 303 is higher than the rib 342 for insulating the low-voltage bus bar 302. The height is also large.

  A cover made of synthetic resin is attached to the routing board 304 on which the bus bars 302 and 303 are routed. The cover is provided with a pressing portion for pressing the routing portions 321 and 331 of the bus bars 302 and 303, a fitting portion for fitting the electronic component, and the like. The electronic component mounting portion includes the fitting portion provided on the cover and connection portions 322 and 332.

JP 2012-65404 A

  The electrical junction box provided with the above-described wiring board 304 has a plurality of problems described below.

  First, the electrical junction box provided with the wiring board 304 has a structure in which the wiring part 321 of the low-voltage bus bar 302 and the wiring part 331 of the high-voltage bus bar 303 are routed on the same surface of the wiring board 304, that is, the bottom surface 340. In addition, since the bottom surface 340 has a flat shape, there is a problem that the rigidity of the routing board 304 is low.

  Further, the height in the vertical direction, that is, the depth of the routing board 304 is set based on an insulation distance necessary for insulation of the high-voltage bus bar 303 (which is caused by the height of the rib 343 and the like). However, the insulation distance necessary for the insulation of the high voltage bus bar 303 is excessive in the insulation of the low voltage bus bar 302. If the electronic component mounting part includes only one of the low-pressure bus bar or the high-pressure bus bar, the connection part of the low-pressure bus bar is usually shorter than the connection part of the high-pressure bus bar (the connection part of the high-pressure bus bar is connected to the low-pressure bus bar). And the length thereof is longer than the connecting portion of the low-pressure bus bar.) As described above, the routing portion 321 of the low-pressure bus bar 302 is the same as the routing portion 331 of the high-pressure bus bar 303. In the electronic component mounting part (for example, relay mounting part) including both the connection part 322 of the low-voltage bus bar 302 and the connection part 332 of the high-voltage bus bar 303, the connection part 322 of the low-voltage bus bar 302 is connected. There is a problem that the height has to be aligned with the height of the connection portion 332 of the high-pressure bus bar 303, and a wasteful portion is generated in the connection portion 322.

  Further, in an electronic component mounting portion (for example, a connector mounting portion) having only the connection portion 322 of the low-voltage bus bar 302, the position of the electronic component mounting portion is a low position, that is, a position close to the bottom surface 340. There was a problem that the nature was bad.

  Furthermore, since the routing portion 321 of the low-pressure bus bar 302 is routed at the same low position as the routing portion 331 of the high-pressure bus bar 303, the cover pressing portion must be formed long and uses a lot of resin. There was a problem that had to be done.

  Therefore, an object of the present invention is to provide an electrical junction box that can increase the rigidity of the wiring board.

  The invention described in claim 1 includes a plurality of bus bars, a routing board in which the plurality of bus bars are routed, and a cover that covers the plurality of bus bars routed in the routing board, In the electrical junction box provided with the electronic component mounting portion on the cover side opposite to the wiring board, the plurality of bus bars are applied with a low voltage bus bar to which a predetermined voltage is applied, and a voltage higher than the predetermined voltage is applied. A high-pressure bus bar, and a low-pressure bus bar wiring surface on which the low-pressure bus bar is routed and a high-pressure bus bar wiring surface on which the high-pressure bus bar is routed. The electric connection box is characterized in that the low-voltage bus bar wiring surface is located closer to the cover than the high-pressure bus bar wiring surface.

  The invention described in claim 2 is the invention described in claim 1, wherein the low-pressure bus bar and the high-pressure bus bar are connected to the low-pressure bus bar wiring surface or the wiring portion along the high-pressure bus bar wiring surface, A connecting portion that is bent and raised from the routing portion toward the cover and constitutes the electronic component mounting portion is provided.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the cover extends to the low-pressure bus bar wiring surface side or the high-pressure bus bar wiring surface side, and the low-pressure bus bar or A pressing portion for pressing each of the high-pressure bus bars is provided.

  According to the invention described in claim 1, since the low-voltage bus bar wiring surface is located on the cover side with respect to the high-pressure bus bar wiring surface, a plurality of surfaces on which the wiring boards are located on different planes. The rigidity of the wiring board can be increased.

  According to the invention described in claim 2, the height of the connection portion of the low-pressure bus bar can be minimized, and the amount of metal used in the low-pressure bus bar can be reduced.

  According to the third aspect of the present invention, the length of the pressing portion that holds the low-pressure bus bar can be minimized, and the amount of resin used in the cover can be reduced.

It is a top view which shows the electrical-connection box concerning the 1st Embodiment of this invention. FIG. 2 is a perspective view of the electrical junction box shown in FIG. 1. FIG. 3 is an exploded view of the electrical junction box shown in FIG. 2. It is sectional drawing along the AA line in FIG. FIG. 4 is a perspective view of a routing board and a bus bar shown in FIG. 3. It is sectional drawing along the BB line in FIG. It is sectional drawing along CC line in FIG. It is a figure which shows the back surface of the cover which comprises the electrical-connection box concerning the 2nd Embodiment of this invention. It is a perspective view of the wiring board and bus bar which comprise the conventional electrical junction box. It is sectional drawing along the DD line in FIG.

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

  The electric junction box 1 shown in FIGS. 1 to 4 is mounted on an automobile and mainly performs power distribution. A plurality of bus bars, a routing board 4 on which the plurality of bus bars are routed, and the routing A cover 5 that is attached to the plate 4 and covers the bus bar, and a plurality of blocks 80, 90, 100 and the like disposed between the routing plate 4 and the cover 5 are provided.

  In addition, the electrical connection box 1 is provided with electronic component mounting portions 7 to 10 on which electronic components such as a fuse 11, a relay 12, and a connector of a wire harness are mounted on the cover 5 side opposite to the wiring board 4. ing. The electronic component mounting part 7 is a mounting part to which the relay 12 is mounted. The electronic component mounting portions 8 and 9 are mounting portions to which the connector of the wire harness is mounted. The electronic component mounting part 10 is a mounting part to which the fuse 11 is mounted.

  The plurality of bus bars are obtained by pressing a metal plate. The plurality of bus bars include a low voltage bus bar 2 to which a predetermined voltage is applied and a high voltage bus bar 3 to which a voltage higher than the predetermined voltage is applied. In the present embodiment, a voltage of 12 V is applied to the low voltage bus bar 2 and a voltage of 46 V is applied to the high voltage bus bar 3.

  As shown in FIG. 5, the low-pressure bus bar 2 includes a routing portion 21 along a routing surface 42 (to be described later) of the routing plate 4, and a connection that is bent at a right angle from the routing portion 21 toward the cover 5. Part 22 is provided. Similarly, in the high-pressure bus bar 3, a routing portion 31 along a routing surface 43 (to be described later) of the routing plate 4, and a connection portion 32 bent at a right angle from the routing portion 31 to the cover 5 side, Is provided.

  The wiring board 4 is made of a synthetic resin and is formed in a shallow box shape. As shown in FIGS. 6 and 7, a low pressure bus bar routing surface 42 on which the routing part 21 of the low pressure bus bar 2 is routed and a routing part 31 of the high pressure bus bar 3 are routed on the routing board 4. And a high-pressure bus bar routing surface 43. The low-pressure bus bar routing surface 42 is located closer to the cover 5 than the high-pressure bus bar routing surface 43.

  Thus, the routing board 4 has the low-pressure bus bar routing surface 42 positioned closer to the cover 5 than the high-pressure bus bar routing surface 43. Therefore, the wiring board 4 has a structure having a plurality of surfaces located on different planes, and the rigidity of the wiring board 4 can be increased. Moreover, the height of the connection part 22 of the low-pressure bus bar 2 can be minimized, and the amount of metal used in the low-pressure bus bar 2 can be reduced.

  Further, the routing plate 4 is provided with a plurality of ribs 46 erected on the cover 5 side from the routing surface 42 and a plurality of ribs 47 erected on the cover 5 side from the routing surface 43. . These ribs 46 and 47 are for positioning the low-pressure bus bar 2 and the high-pressure bus bar 3 and insulating between adjacent bus bars. Moreover, the height of the ribs 46 and 47 is required to be a height corresponding to the voltage value of the bus bar to be insulated, and the rib 47 that insulates the high-voltage bus bar 3 is higher than the rib 46 that insulates the low-voltage bus bar 2. It is taken greatly. Further, the tip of the rib 47 is located closer to the cover 5 than the tip of the rib 46.

  The cover 5 is made of synthetic resin. The cover 5 is provided with a plurality of pressing portions 51 extending to the wiring board 4 side. As shown in FIG. 7, the holding portion 51 is configured to hold the routing portion 21 of the low-pressure bus bar 2 or the routing portion 31 of the high-pressure bus bar 3 to regulate the displacement of the bus bars 2 and 3.

  Further, as described above, since the low pressure bus bar routing surface 42 is located on the cover 5 side with respect to the high pressure bus bar routing surface 43, the length of the pressing portion 51 that holds the routing portion 21 of the low pressure bus bar 2 is minimized. The amount of resin used for the cover 5 can be reduced.

  Further, as shown in FIGS. 3 and 7, the cover 5 is provided with a fitting portion 71 into which the relay 12 is fitted. A plurality of insertion holes 72 through which the respective terminals 12 a of the relay 12 are inserted are provided on the bottom surface of the fitting portion 71. Each terminal 12 a inserted through each insertion hole 72 by fitting the relay 12 in the fitting portion 71 is electrically connected to the connection portion 22 of the low-voltage bus bar 2 or the connection portion 32 of the high-voltage bus bar 3 by the relay terminal 6. The fitting portion 71, the relay terminal 6, the connection portion 22 of the low voltage bus bar 2, and the connection portion 32 of the high voltage bus bar 3 constitute the electronic component mounting portion 7.

  As shown in FIG. 7, in the connection parts 22 and 32 constituting the electronic component mounting part 7, the connection part 22 is formed shorter than the connection part 32, but the low-voltage bus bar arrangement surface 42 is arranged in the high-voltage bus bar arrangement. Since it is located on the cover 5 side with respect to the search surface 43, the distal end position of the connection portion 22 is aligned with the distal end position of the connection portion 32. Therefore, there is no problem in mounting the relay 12. Moreover, although the connection part 22 of the low voltage | pressure bus bar 2 is formed narrower than the connection part 32 of the high voltage | pressure bus bar 3, since it is formed in length short, it is hard to deform | transform.

  In addition, the cover 5 has an opening 52 through which fitting portions 81, 91, 101 (described later) provided in the blocks 80, 90, 100 are passed, and the fitting portions 81, 91, 101 in the opening 52. Guide ribs 53 for guiding are provided.

  The plurality of blocks 80, 90, 100 are parts made of synthetic resin, and together with the connection part 22 of the low-voltage bus bar 2 or the connection part 32 of the high-voltage bus bar 3, constitute the electronic component mounting parts 8, 9, 10. Is.

  As shown in FIG. 4, the block 90 has a fitting portion 91 into which the connector of the wire harness is fitted, and a plurality of connecting portions that communicate with the fitting portion 91 and through which the connecting portions 22 of the low-pressure bus bar 2 are inserted. An insertion hole 92 is provided. The fitting portion 91 passes through the opening 52 of the cover 5 and protrudes outside the cover 5. The block 90 and the plurality of connecting portions 22 constitute the electronic component mounting portion 9. The block 80, like the block 90, constitutes the electronic component mounting portion 8 on which the connector of the wire harness is mounted together with the plurality of connection portions 22.

  As described above, the electronic component mounting portions 8 and 9 include the blocks 80 and 90 and the plurality of connection portions 22. Since these low-voltage bus bar routing surfaces 42 are located closer to the cover 5 than the high-voltage bus bar routing surface 43, these electronic component mounting portions 8 and 9 are located at a higher position, that is, closer to the cover 5. Good connector insertion workability.

  As shown in FIGS. 3 and 4, the block 100 has a fitting portion 101 into which the fuse 11 is fitted, and a connecting portion insertion hole that is connected to the fitting portion 101 and through which each connecting portion 32 of the high-voltage bus bar 3 is inserted. 102. The fitting portion 101 protrudes outside the cover 5 through the opening 52 of the cover 5. The block 100 and the plurality of connection portions 32 constitute the electronic component mounting portion 10. The block 100 is provided with a plurality of fitting portions 101 integrally.

(Second Embodiment)
An “electric connection box” according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 8, the same components as those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The electrical junction box of this embodiment does not include the blocks 80, 90, 100 described in the first embodiment, but instead includes a cover 5 'shown in FIG. In addition to the structure of the cover 5 demonstrated in 1st Embodiment, the cover 5 'has the fitting parts 81, 91, and 101 integrally.

  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 Electrical junction box 2 Low voltage bus bar 3 High voltage bus bar 4 Arrangement board 5, 5 'cover 7-10 Electronic component mounting part 21,31 Arrangement part 22,32 Connection part 42 Low voltage bus bar arrangement surface 43 High pressure bus bar arrangement surface

Claims (3)

The cover that includes a plurality of bus bars, a routing board in which the plurality of bus bars are routed, and a cover that covers the plurality of bus bars that are routed on the routing board, the cover being opposite to the routing board In the electrical junction box provided with an electronic component mounting part on the side,
The plurality of bus bars include a low voltage bus bar to which a predetermined voltage is applied, and a high voltage bus bar to which a voltage higher than the predetermined voltage is applied,
The wiring board is provided with a low-pressure bus bar wiring surface on which the low-pressure bus bar is routed, and a high-pressure bus bar wiring surface on which the high-pressure bus bar is routed,
The electrical connection box, wherein the low-voltage bus bar routing surface is located closer to the cover than the high-pressure bus bar routing surface. The low-voltage bus bar and the high-voltage bus bar are bent and raised to the cover side from the wiring portion along the low-voltage bus bar wiring surface or the high-voltage bus bar wiring surface, and constitute the electronic component mounting portion The electrical connection box according to claim 1, wherein a connection portion is provided. 2. The cover is provided with a pressing portion that extends to the low-pressure bus bar wiring surface side or the high-pressure bus bar wiring surface side and presses either the low-pressure bus bar or the high-pressure bus bar. Or the electrical-connection box of Claim 2.

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