JP6026243B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electric junction box including a fuse having a main body portion and a pair of terminal portions protruding from the main body portion and extending away from each other.

  FIG. 12 is an exploded view of a conventional electric junction box having a fuse (see FIG. 5 of Patent Document 1). As shown in the figure, the electrical junction box 261 includes a fuse 251, an upper case 262, and a lower case 263.

  The fuse 251 has a main body portion 252 and a pair of terminal portions 253. The main body portion 252 has a soluble body in which a pair of terminal portions 253 are connected to each other, and a transparent case that accommodates the end portions of the soluble body and the pair of terminal portions 253. Further, the pair of terminal portions 253 protrude in directions away from both sides of the case, and each is provided with a bolt insertion hole 254.

  The upper case 262 is provided with an accommodating portion 264 that opens upward and can accommodate the fuse 251. A pair of nuts to which bolts 268 passed through the bolt insertion holes 254 are screwed are attached to the bottom surface of the accommodating portion 264. In addition, two bus bars provided with bolt insertion holes at positions corresponding to the nuts are positioned near the bottom surface of the housing portion 264.

  The fuse 251 is accommodated in the accommodating portion 264 in a state where the terminal portions 253 are overlapped on the bus bars. The fuse 251 is fixed in the accommodating portion 264 by screwing a bolt 268 passed through the bolt insertion hole 254 of the terminal portion 253 and the bolt insertion hole of the bus bar into the nut.

  In such an electrical connection box 261, since the upper case 262 is provided with an accommodating portion 264 that opens upward, it is possible to easily visually check whether or not the fusible body of the fuse 251 has melted.

JP 2000-332446 A

  However, the above-described electrical junction box 261 has a problem in that the terminal case 253 is likely to be splashed with water or dust because the upper case 262 is always provided with the accommodating portion 264. Further, if the terminal portion 253 is easily splashed with water or dust, the terminal portion 253 is easily corroded, which is not preferable. Further, since the terminal portion 253 is exposed, there is a problem that an operator touches it by mistake, and there is a problem that a short circuit due to a foreign matter may occur.

  Accordingly, an object of the present invention is to provide an electrical junction box that can easily check whether a fuse is blown and prevent the terminal portion of the fuse from being splashed with water or dust.

In order to achieve the above object, the invention described in claim 1 is characterized in that a fuse having a main body portion and a pair of terminal portions protruding from the main body portion and extending away from each other, a frame to which the fuse is attached, an electrical junction box wherein the frame includes an opening for exposing the upper surface of the main body portion, disposed on both sides of the opening, and a pair of cover portions covering the upper surface of the pair of terminal portions, The electrical connection box is characterized in that the fuse is attached to the lower surface side of the frame.

  According to a second aspect of the present invention, in the first aspect of the present invention, a bolt mounting portion to which a head portion of a bolt is attached is provided on the lower surface side of the pair of cover portions, and the pair of terminal portions are provided. Is provided with a bolt through hole through which the shaft portion of the bolt is passed.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the frame is provided with a cylindrical portion having the opening, and the main body is positioned in the cylindrical portion. It is characterized by this.

According to the first aspect of the present invention, the frame includes an opening that exposes the upper surface of the main body, and a pair of cover portions that are disposed on both sides of the opening and cover the upper surfaces of the pair of terminal portions. When provided with a so the fuse is attached to the lower surface side of the frame, blown confirmation fuse easily performed, and provide an electrical connection box which can prevent water or dust is applied to the terminal portion of the fuse can do.

  According to the invention described in claim 2, a bolt mounting portion to which a head portion of the bolt is attached is provided on the lower surface side of the pair of cover portions, and the shaft portion of the bolt is provided on the pair of terminal portions. Since the bolt through hole is provided, the bolt head is attached to the bolt mounting portion, the shaft portion of the bolt is passed through the bolt through hole of the pair of terminal portions, and the nut is screwed into the shaft portion. Thus, the fuse can be easily attached to the frame.

  According to the invention described in claim 3, since the cylindrical portion having the opening is provided in the frame and the main body is positioned in the cylindrical portion, water and dust are applied to the terminal portion of the fuse. This can be further prevented.

It is a perspective view which shows the electrical junction box concerning one Embodiment of this invention. It is a perspective view which shows the flame | frame shown in FIG. 1, and the components attached to this flame | frame. It is a cross-sectional perspective view along the AA line in FIG. It is sectional drawing along the AA line in FIG. FIG. 3 is an exploded view of the frame and components shown in FIG. 2. It is a perspective view which shows only the flame | frame shown by FIG. FIG. 7 is a perspective view illustrating a state in which a bolt is attached to the frame illustrated in FIG. 6. FIG. 8 is a perspective view illustrating a state in which a bus bar is attached to the frame illustrated in FIG. 7. FIG. 9 is a perspective view illustrating a state in which a fuse is attached to the frame illustrated in FIG. 8. FIG. 10 is a perspective view illustrating a state in which a nut is screwed into the bolt illustrated in FIG. 9. It is a perspective view which shows the upper surface side of the flame | frame shown by 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. The electrical junction box of the present invention is mounted on a vehicle and supplies power and transmits signals to an electronic device mounted on the vehicle. 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 and 3, the electrical junction box 10 includes a fuse (corresponding to a “fuse” in the claims and also called a fusible link) 6, a pair of bolts 7, a pair of nuts 8, and a pair of bus bars. 5. A plurality of components such as a plurality of fuses and a plurality of electric wires (not shown), a synthetic resin frame 4 to which these components are attached, and a waterproof case 1 in which the frame 4 is accommodated.

  As shown in FIG. 3, the fuse 6 includes a main body portion 13 and a pair of terminal portions 11 made of a metal plate. The main body portion 13 includes a fusible body 12 in which a pair of terminal portions 11 are connected to each other, and a transparent case 60 that accommodates the end portions of the fusible body 12 and the pair of terminal portions 11. The fusible body 12 is made of a conductor and melts when an overcurrent flows. The upper surface 60a of the case 60 is made of a transparent synthetic resin so that it can be visually checked whether or not the fusible body 12 has melted. The pair of terminal portions 11 protrude from the bottom surface 60b of the case 60, bend at a right angle at the bottom surface 60b, and extend in directions away from each other. Further, a bolt passage hole 11 a through which the shaft portion 72 of the bolt 7 is passed is provided in a portion of each terminal portion 11 positioned outside the case 60.

  The pair of bus bars 5 are obtained by pressing a metal plate or the like. As shown in FIG. 5, each bus bar 5 is formed in a flat plate shape, and includes a first connection portion 50 provided with a bolt through hole 50 a through which the shaft portion 72 of the bolt 7 is passed, and an end of the first connection portion 50. The engagement piece 51 bent at the portion, the plurality of second connection portions 52 formed in a rectangular plate shape and arranged at intervals, the first connection portion 50 and the plurality of second connection portions 52. And a connecting portion 53 that is connected.

  The waterproof case 1 includes a main body case 2 formed in a box shape by a bottom wall 20 and a peripheral wall 21, and a cover 3 that covers an opening of the main body case 2. A concave notch 23 is formed in one wall constituting the peripheral wall 21 from the edge near the opening to the bottom wall 20 side. Further, a semi-cylindrical wire lead-out portion constituting portion 24 projects from the one wall so as to follow a part of the outline of the notch 23. The wire lead-out portion constituting portion 24 is combined with the semi-cylindrical wire lead-out portion constituting portion 44 provided on the frame 4 to constitute a cylindrical wire lead-out portion 9. A plurality of electric wires (not shown) attached to the frame 4 are passed through the electric wire outlet portion 9.

  As shown in FIGS. 2 to 5, the frame 4 is integrally provided with a block-shaped frame main body 40 and the wire lead-out portion constituting portion 44 connected to the side surface of the frame main body 40. A plurality of fuse attachment portions 41 to which fuses (not shown) are attached are provided on the upper surface 4 a side of the frame body 40. On the lower surface 4 b side of the frame body 40, a pair of bus bar insertion grooves 42, a plurality of electric wire attachment portions 43, and a fuse attachment portion 45 to which the fuse 6 is attached are provided. The pair of bus bar insertion grooves 42 and the plurality of wire attachment portions 43 are provided on the back side of the plurality of fuse attachment portions 41. A plurality of locking portions 49 that lock the main body case 2 are provided on the side surface of the frame main body 40.

  Each of the second connection portions 52 of the bus bar 5 described above is inserted into the bus bar insertion groove 42 and is electrically connected to one terminal portion of each fuse attached to the fuse attachment portion 41. The plurality of electric wires described above are each inserted into the electric wire attachment portion 43 and electrically connected to the other terminal portion of each fuse attached to the fuse attachment portion 41.

  As shown in FIGS. 3 and 5, the fuse mounting portion 45 is disposed on both sides of the cylindrical portion 46 having an opening 46 a opened on the upper surface 4 a side and an opening 46 b opened on the lower surface 4 b side. The pair of cover portions 47 and a pair of bolt mounting portions 48 provided on the back side of the pair of cover portions 47, that is, on the lower surface 4b side. A head 71 of the bolt 7 is attached to the bolt attachment portion 48 by press fitting. Further, a locking projection 46 c that locks to the bus bar 5 is provided on the inner surface of the cylindrical portion 46.

  The first connection portion 50 of the bus bar 5 described above is positioned on the lower surface 4b side of the cover portion 47 as shown in FIGS. Then, the shaft portion 72 of the bolt 7 press-fitted and fixed to the bolt mounting portion 48 is passed through the bolt through hole 50 a of the first connection portion 50. Further, the locking piece 51 of the bus bar 5 is overlaid on the inner surface of the cylindrical portion 46. Then, the locking projection 46 c is locked in the locking hole provided in the locking piece 51.

  As shown in FIGS. 3 and 4, the fuse 6 described above has the main body portion 13 positioned in the cylindrical portion 46, the pair of terminal portions 11 positioned on the lower surface 4b side of the pair of cover portions 47, and the bolt through hole 11a. The shaft portion 72 of the bolt 7 is passed through and attached to the fuse attachment portion 45. Further, the nut 6 is screwed into the shaft portion 72 that is passed through the bolt through hole 50 a of the first connection portion 50 and the bolt through hole 11 a of the terminal portion 11, whereby the fuse 6 is fixed to the fuse mounting portion 45. At the same time, the first connection part 50 and the terminal part 11 are overlapped and electrically connected.

  When the fuse 6 is fixed to the fuse mounting portion 45, the upper surface 60a of the case 60 is exposed from the opening 46a of the cylindrical portion 46 to the upper surface 4a side of the frame 4, and the upper surfaces of the pair of terminal portions 11 are paired. Covered by the cover 47.

  In such an electrical junction box 10, the opening 4 a that exposes the upper surface 60 a of the case 60 is provided in the frame 4, so that the fusible body 12 of the fuse 6 is blown by removing the cover 3 from the main body case 2. It can be easily visually confirmed whether or not it has been done. In the electrical junction box 10, the frame 4 is provided with the pair of cover portions 47 that cover the upper surfaces of the pair of terminal portions 11, so that the pair of terminal portions 11 can be prevented from being splashed with water or dust. Further, in the electrical junction box 10, since the frame 4 is provided with the cylindrical portion 46 having the opening 46a, water and dust adhering to the upper surface 4a of the frame 4 pass through the opening 46a toward the lower surface 4b. It can prevent moving, and can further prevent water and dust from being applied to the pair of terminal portions 11.

  Then, the assembly procedure of the said electrical junction box 10 is demonstrated with reference to FIGS. First, as shown in FIG. 6, the frame 4 is placed on a work table or the like with the lower surface 4b of the frame 4 facing upward.

  Next, as shown in FIG. 7, the head portion 71 of the bolt 7 is press-fitted into the bolt attachment portion 48, and the pair of bolts 7 is attached to the pair of bolt attachment portions 48.

  Next, as shown in FIG. 8, the pair of bus bars 5 are attached to the lower surface 4 b side of the frame 4. At this time, the first connecting portion 50 is positioned on the lower surface 4b side of the covering portion 47, the shaft portion 72 of the bolt 7 is passed through the bolt through hole 50a, and the locking piece 51 is locked to the locking projection 46c, so that a plurality of The second connection portion 52 is attached so as to be inserted into the bus bar insertion groove 42.

  Next, as shown in FIG. 9, the fuse 6 is attached to the fuse attachment portion 45. At this time, the pair of terminal portions 11 are positioned on the lower surface 4 b side of the pair of cover portions 47, the shaft portion 72 of the bolt 7 is passed through the bolt through hole 11 a, and the main body portion 13 is positioned so as to be positioned in the cylindrical portion 46. . In this state, the pair of terminal portions 11 overlaps the first connection portions 50 of the pair of bus bars 5.

  Next, as shown in FIG. 10, the nut 8 is screwed to each of the shaft portions 72 of the pair of bolts 7, the fuse 6 is fixed to the fuse mounting portion 45, and the pair of terminal portions 11 are connected to each of the pair of bus bars 5. The first connection part 50 is electrically connected. Thus, the fuse 6 electrically connects the pair of bus bars 5 to each other. Then, when an overcurrent flows between the pair of bus bars 5, the current is cut off. Further, in the electrical junction box 10, since the bolt attachment portion 48 to which the head 71 of the bolt 7 is attached is provided on the lower surface 4 b side of the pair of cover portions 47, the fuse 6 can be easily attached to the frame 4 in this way. Can be attached to.

  Next, a plurality of electric wires (not shown) having terminal fittings attached to the end portions are respectively inserted into the electric wire attachment portions 43.

  Next, as shown in FIG. 11, the frame 4 is placed on a work table or the like with the upper surface 4 a facing upward, and a plurality of fuses (not shown) are respectively attached to the fuse attachment portions 41.

  Next, the frame 4 is accommodated in the main body case 2. At this time, the frame 4 is accommodated in the main body case 2 such that a plurality of electric wires positioned outside the electric wire attaching portion 43 are positioned between the electric wire outlet portion constituting portion 24 and the electric wire outlet portion constituting portion 44. Further, when the frame 4 is completely attached to the main body case 2, the wire lead-out portion constituting portions 24 and 44 constitute a cylindrical wire lead-out portion 9. As a result, the plurality of electric wires are led out from the main body case 2 from the electric wire outlet portion 9.

  Finally, the assembly of the electrical junction box 10 is completed by attaching the cover 3 to the main body case 2.

  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.

4 Frame 6 Fuse 7 Bolt 10 Electrical Junction Box 11 Terminal Part 11a Bolt Passing Hole 46 Tube Part 46a Opening 47 Covering Portion 48 Bolt Mounting Part 60 Body Part 71 Head 72 Shaft Part

Claims (3)

A fuse having a main body part and a pair of terminal parts protruding from the main body part and extending away from each other;
An electrical connection box comprising a frame to which the fuse is attached,
The frame includes an opening that exposes the upper surface of the main body, and a pair of cover portions that are disposed on both sides of the opening and cover the upper surfaces of the pair of terminal portions ,
The electrical connection box, wherein the fuse is attached to a lower surface side of the frame. On the lower surface side of the pair of cover portions, a bolt mounting portion to which a head portion of the bolt is attached is provided,
The electrical connection box according to claim 1, wherein a bolt through hole through which the shaft portion of the bolt is passed is provided in the pair of terminal portions. The frame is provided with a cylindrical portion having the opening,
The electrical junction box according to claim 1, wherein the main body portion is positioned in the cylindrical portion.

Images