JP2013255347A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box which easily makes electrical connection between bus bars in a small space and is easily assembled.SOLUTION: An electric connection box 10 includes: multiple bus bars 1 to 4 formed by metal plates; a bolt block 8 where a shaft part 72 of a bolt 7 protrudes from an upper surface of a resin block 6; and a frame 9 provided with a recessed part 91 that may house the bolt block 8. The first bus bar 1 and the second bus bar 2 are attached to the bolt block 8. The first bus bar 1 is electrically connected with the second bus bar 2 through a fusion part 5 which fuses when an eddy current flows therethrough. The third bus bar 3 is provided with a spring part 31 which elastically contacts with the second bus bar 2. The fourth bus bar 4 is provided with a spring part 41 which elastically contacts with the first bus bar 1.

Description

  The present invention relates to an electrical junction box having a plurality of bus bars made of metal plates.

  A variety of electronic devices are mounted on automobiles. In order to perform power supply and signal transmission to these various electronic devices, an electric junction box is mounted on the automobile. The electrical connection box has various configurations. For example, as in the electrical connection box 210 shown in FIG. 9, the frame 202, the bus bar 205 assembled to the frame 202, the bus bar 205, and the power cable. The thing of the structure which has the bolt block 201 for fixing the external terminal connected to the terminal of this is known (refer patent document 1).

  The frame 202 is provided with a plurality of mounting portions 222 to which relays and fuses are mounted, an opening 223 to which the bolt block 201 is mounted, and the like.

  The bolt block 201 includes a bolt 204 having a shaft portion 241 and a head 242 and a resin block 203. The resin block 203 includes an attachment member main body 230 to which the head portion 242 of the bolt 204 is attached, and a locking protrusion 231 that is locked to the frame 202.

  The bus bar 205 is a wiring member obtained by pressing a metal plate. The bus bar 205 includes an upper surface side connection portion 251 that is superimposed on the upper surface of the mounting member main body 230, a plurality of component connection portions 256 that are electrically connected to relays and fuses, an upper surface side connection portion 251 and a plurality of component connection portions 256. And a connecting portion 257 that is bent at a plurality of locations. The upper surface side connection portion 251 is formed with a through hole 252 through which the shaft portion 241 of the bolt 204 is passed.

  Further, the bus bar 205 and the bolt block 201 are assembled to the frame 202 from the lower surface side, as indicated by a one-dot chain arrow in FIG. After the bus bar 205 and the bolt block 201 are assembled to the frame 202, the external terminal connected to the terminal of the power cable is overlaid on the upper surface side connection portion 251 and the shaft portion 241 passes through the through hole of the external terminal. Further, the nut is screwed onto the shaft portion 241 so that the external terminal and the upper surface side connecting portion 251 are fixed and electrically connected to each other.

JP 2011-223777 A

  However, the electrical junction box 210 having the bus bar 205 described above has the following problems. That is, the bus bar 205 has an upper surface side connection part 251, a coupling part 257, and a plurality of component connection parts 256, and the shape is very complicated, so that the bus bar 205 itself is not easily manufactured. Further, there is a problem that the assembly work of the electric junction box 210 is complicated. In addition, when the bus bar 205 is divided into a plurality of parts to solve this problem, connectors, bolts and nuts are required to electrically connect the divided bus bars, and new work processes and extra space are required. There was a problem of becoming necessary.

  Furthermore, other bus bars may be electrically connected to the above-described bus bar 205 via a fuse-fusible link having a fusing part, but bolts and nuts were used at these connection points. There are problems that the fastening operation of the bolts and nuts is complicated, and that the electrical connection box 210 is enlarged by using the bolts and nuts.

  Accordingly, an object of the present invention is to provide an electrical junction box that can be easily electrically connected to each other in a small space and can be easily assembled.

  In order to achieve the above object, the invention described in claim 1 includes a plurality of bus bars made of metal plates, and the plurality of bus bars are electrically connected to each other. The electrical connection box is characterized in that a spring portion is provided in elastic contact with the other one bus bar.

  The invention described in claim 2 is the invention described in claim 1, further comprising a bolt block in which a shaft portion of a bolt protrudes from an upper surface of the resin block, and is attached to the bolt block as the plurality of bus bars. An upper surface side connection portion that is positioned on the upper surface of the resin block and is fastened together with an external terminal by the bolt and nut; and one side surface of the resin block And a side-surface-side connection portion positioned on the surface.

  The invention described in claim 3 is the invention described in claim 2, wherein the plurality of bus bars are attached to the bolt block and positioned on the other side of the resin block, and are electrically connected to the first bus bar. A second bus bar connected to the second bus bar; and a third bus bar electrically connected to the second bus bar, wherein the first bus bar and the second bus bar are melted when an overcurrent flows. The third bus bar is electrically connected via a fusing part, and the third bus bar has the spring part that elastically contacts the second bus bar.

  The invention described in claim 4 is the invention described in claim 3, further comprising a fourth bus bar electrically connected to the first bus bar as the plurality of bus bars, and the fourth bus bar. Has the spring part that elastically contacts the side surface side connection part, and the bolt block to which the first bus bar and the second bus bar are attached includes the spring part of the third bus bar and the first bus bar. It is clamped between the said spring part of 4 bus bars, It is characterized by the above-mentioned.

  The invention described in claim 5 is the invention described in claim 4, further comprising a frame provided with a recess capable of accommodating the bolt block, wherein the spring portion of the third bus bar and the first The spring part of 4 bus bars is along the inner surface of the recess.

  According to the first and second aspects of the present invention, since at least one bus bar is provided with the spring portion that elastically contacts the other bus bar, electrical connection can be made by simply overlapping the bus bars. Can do. Therefore, it is possible to provide an electrical junction box that can be easily electrically connected to each other in a small space and can be easily assembled.

  According to the invention described in claim 3, even in a circuit in which a fusing part is incorporated between the bus bars, the bus bars are easily electrically connected in a small space without using other parts such as bolts and nuts. An electrical junction box can be provided that can be easily assembled.

  According to the invention described in claim 4, the first to fourth bus bars are electrically connected only by fitting the bolt block between the spring portion of the third bus bar and the spring portion of the fourth bus bar. It is possible to provide an electrical junction box that can be easily assembled.

  According to the fifth aspect of the present invention, there is provided an electrical junction box that can electrically connect the first to fourth bus bars by simply fitting the bolt block into the recess of the frame and can be easily assembled. be able to.

It is a perspective view of the electrical junction box concerning one embodiment of the present invention. FIG. 2 is a plan view of the electric junction box shown in FIG. 1. It is sectional drawing along the AA line in FIG. FIG. 2 is an exploded view of the electrical junction box shown in FIG. 1. It is sectional drawing along the BB line in FIG. FIG. 5 is an enlarged view of the bus bar shown in FIG. 4. FIG. 5 is an enlarged view of the bolt block shown in FIG. 4. It is sectional drawing along CC line in FIG. It is an exploded view of the conventional electrical junction box.

  An “electric connection box” according to an embodiment of the present invention will be described with reference to FIGS. 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 FIGS. 1 to 5, the electrical junction box 10 includes a first bus bar 1, a second bus bar 2, a third bus bar 3, a fourth bus bar 4, a bolt block 8, and a frame. 9. The four bus bars 1 to 4 are wiring members obtained by pressing a metal plate or the like.

  As shown in FIGS. 7 and 8, the bolt block 8 includes a resin block 6 formed of a synthetic resin in a cubic shape, and a bolt 7 having a head portion 71 and a shaft portion 72. The bolt 7 has a head portion 71 fixed to the resin block 6 and a shaft portion 72 protruding from the upper surface of the resin block 6. Further, the resin block 6 is provided with a locking projection (not shown) that locks into a locking recess 96 (see FIG. 5) provided in a recess 91 described later of the frame 9.

  The frame 9 is made of synthetic resin. The frame 9 is provided with a recess 91 that can accommodate the bolt block 8 and a plurality of cavities 92, 93, and 94 that accommodate terminals of electronic components such as relays, fuses, and fusible links. The concave portion 91 is formed in a concave shape from the upper surface 9 a to the lower surface 9 b side of the frame 9. Further, reference numeral 91 a in FIG. 5 is the bottom surface of the recess 91, and reference numerals 91 b, 91 c and 91 d are the inner surfaces of the recess 91. The inner side surface 91b and the inner side surface 91c face each other. In addition, the recess 91 has an inner surface (not shown) that faces the inner surface 91d. Further, the locking recess 96 is provided on the inner side surface 91d.

  As shown in FIG. 4, the plurality of cavities 92 are arranged in two rows and are arranged adjacent to the recesses 91. The outer wall constituting the cavity 92 is formed flush with the inner side surface 91 d of the recess 91. A pair of slits 95 through which the third bus bar 3 and the fourth bus bar 4 pass are formed in the outer wall and the inner side surface 91d constituting the cavity 92.

  As shown in FIGS. 7 and 8, the first bus bar 1 integrally includes an upper surface side connection portion 11 positioned on the upper surface of the resin block 6 and a side surface side connection portion 13 positioned on one side surface of the resin block 6. Have. A through hole 12 through which the shaft portion 72 of the bolt 7 passes is formed in the upper surface side connection portion 11. The upper surface side connection portion 11 is fastened together with an external terminal by a bolt 7 and a nut screwed to the shaft portion 72 of the bolt 7. The external terminal is, for example, a round terminal connected to the terminal of the power cable.

  The second bus bar 2 is positioned on the other side of the resin block 6 as shown in FIGS. The second bus bar 2 faces the side surface side connection portion 13 of the first bus bar 1.

  The first bus bar 1 and the second bus bar 2 are electrically connected via a fusing part 5 that blows when an overcurrent flows. The first bus bar 1 and the second bus bar 2 are attached to the bolt block 8 by being put on the resin block 6 while being electrically connected to each other by the fusing part 5.

  As shown in FIG. 6, the third bus bar 3 is folded back at the upper end of the flat plate portion 30, the spring portion 31 formed in a plate spring shape, and extended from the flat plate portion 30 to form a strip shape. The extended strip-shaped portion 32, a plurality of component connecting portions 33 extending from the upper end of the strip-shaped portion 32, and a locking hole 34 penetratingly formed in the strip-shaped portion 32 are integrally provided. As shown in FIG. 3, the flat plate portion 30 and the spring portion 31 are positioned in the concave portion 91 of the frame 9 and are along the inner side surface 91 b of the concave portion 91. The spring portion 31 is electrically connected to the second bus bar 2 by elastic contact with the second bus bar 2 attached to the bolt block 8. The strip portion 32 and the plurality of component connection portions 33 are positioned in the plurality of cavities 92. Each component connection portion 33 is electrically connected to a terminal of an electronic component housed in each cavity 92. Further, the third bus bar 3 is assembled to the frame 9 by a lock provided in the cavity 92 being engaged with the engagement hole 34.

  As shown in FIG. 6, the fourth bus bar 4 is folded back at the upper end of the flat plate portion 40, the spring portion 41 formed in a plate spring shape, and extended from the flat plate portion 40 to form a belt shape. The strip-shaped portion 42 that extends, a plurality of component connection portions 43 that extend from the upper end of the strip-shaped portion 42, and a locking hole 44 that is formed through the strip-shaped portion 42 are integrally provided. As shown in FIG. 3, the flat plate portion 40 and the spring portion 41 are positioned in the concave portion 91 of the frame 9 and are along the inner side surface 91 c of the concave portion 91. Further, the spring portion 41 is electrically connected to the first bus bar 1 by elastic contact with the side surface side connection portion 13 of the first bus bar 1 attached to the bolt block 8. The belt-like portion 42 and the plurality of component connection portions 43 are positioned in the plurality of cavities 92. Each component connection portion 43 is electrically connected to a terminal of an electronic component housed in each cavity 92. Further, the fourth bus bar 4 is assembled to the frame 9 by the lock provided in the cavity 92 being engaged with the engagement hole 44.

  Then, the assembly method of the electrical junction box 10 is demonstrated. First, the fusing part 5 is attached to the first bus bar 1 and the second bus bar 2 to connect the first bus bar 1 and the second bus bar 2, and this is attached to the bolt block 8. Further, the third bus bar 3 and the fourth bus bar 4 are assembled to the frame 9 from the upper surface 9a side.

  And while inserting the bolt block 8 to which the 1st bus bar 1 and the 2nd bus bar 2 were attached in the recessed part 91 from the upper surface 9a side, the spring part 31 of the 3rd bus bar 3 and the 4th bus bar 4 Push between spring part 41. The pushed-in bolt block 8 is clamped between the spring portions 31 and 41, and the locking projection provided on the resin block 6 is locked in the locking recess 96 in the recess 91 so that the bolt block 8 is attached in the recess 91. It is done. By attaching the bolt block 8 in the recess 91 in this way, the first bus bar 1, the second bus bar 2, the third bus bar 3, the fourth bus bar 4 and the fusing part 5 are electrically connected to each other. .

  A plurality of electronic components are mounted in the cavities 92, 93, 94 before, or after, the operation of attaching the bolt block 8 in the recess 91.

  And after attaching the bolt block 8 in the recessed part 91, the external terminal connected to the power cable etc. is piled up on the upper surface side connection part 11 of the 1st bus bar 1, and a nut is screwed together to the bolt 7, and external The terminal and the upper surface side connection part 11 are fastened together to electrically connect them. The electrical junction box 10 is assembled through such operations.

  In the electrical junction box 10 described above, the power input to the first bus bar 1 via the external terminal is distributed to the third bus bar 3 and the fourth bus bar 4, and further, the cavity is formed by each bus bar 3, 4. 92 is distributed to each electronic component mounted on 92. Further, when an overcurrent flows from the first bus bar 1 to the second bus bar 2 and the third bus bar 3, the fusing part 5 is melted and the power supply is cut off.

  Thus, according to this invention, since the 1st bus bar 1, the 2nd bus bar 2, and the fusing part 5 are integrated with the bolt block 8, the electrical connection box 10 can be space-saving. Further, since the first bus bar 1 and the second bus bar 2 are electrically connected to each other by the fusing portion 5 and the spring portions 31 and 41 are provided on the third bus bar 3 and the fourth bus bar 4, The bus bars 1 to 4 can be easily electrically connected in a small space without using other parts such as nuts.

  Further, since the connection between the first bus bar 1 and the fourth bus bar 4 and the connection between the second bus bar 2 and the third bus bar 3 are performed on the side surface of the resin block 6, the frame of the bolt block 8 is used. 9 can be easily attached and detached. Furthermore, since the bolt block 8 is structured to be fitted into the recess 91 from the upper surface 9a side of the frame 9, the bolt block 8 can be attached to and detached from the frame 9 more easily. In addition, since the bottom surface 91a is provided in the recess 91, the bolt block 8 does not fall down even when the tightening torque when the nut is screwed onto the bolt 7 is excessively applied.

  Moreover, since the 1st bus bar 1 and the 2nd bus bar 2 which were connected by the fusing part 5 can be easily attached or detached to the bolt block 8, when the fusing part 5 blows, the bolt block 8 can be reused. it can.

  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 1st bus bar 2 2nd bus bar 3 3rd bus bar 4 4th bus bar 5 Fusing part 6 Resin block 7 Bolt 8 Bolt block 9 Frame 10 Electrical connection box 31,41 Spring part

Claims (5)

In an electrical junction box having a plurality of bus bars made of metal plates, the plurality of bus bars being electrically connected to each other,
An electrical junction box, wherein at least one bus bar is provided with a spring portion that elastically contacts another bus bar. It further has a bolt block in which the shaft portion of the bolt protrudes from the upper surface of the resin block,
As the plurality of bus bars, having a first bus bar attached to the bolt block,
The first bus bar is positioned on the upper surface of the resin block, and an upper surface side connection portion that is fastened together with an external terminal by the bolt and nut; and a side surface side connection portion that is positioned on one side surface of the resin block. The electrical junction box according to claim 1, wherein the electrical junction box is provided. A plurality of bus bars that are attached to the bolt block and positioned on the other side of the resin block and electrically connected to the first bus bar; and a second bus bar that is electrically connected to the second bus bar. 3 bus bars,
The first bus bar and the second bus bar are electrically connected via a fusing part that fusing when an overcurrent flows,
The electrical connection box according to claim 2, wherein the third bus bar has the spring portion that elastically contacts the second bus bar. The plurality of bus bars further includes a fourth bus bar electrically connected to the first bus bar, and the fourth bus bar includes the spring portion that elastically contacts the side surface side connection portion,
The bolt block to which the first bus bar and the second bus bar are attached is sandwiched between the spring part of the third bus bar and the spring part of the fourth bus bar. The electrical junction box according to claim 3. It further has a frame provided with a recess capable of accommodating the bolt block,
The electrical junction box according to claim 4, wherein the spring portion of the third bus bar and the spring portion of the fourth bus bar are along an inner surface of the recess.

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