JP5798499B2 - Electrical junction box - Google Patents

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. 6 is an exploded view of a conventional electrical junction box. The electrical junction box 201 includes a synthetic resin frame 210, a bus bar 220 and a bolt block 230 assembled to the frame 210.

  The frame 210 is provided with sockets 213 and 214 for mounting fuses and fusible links on the upper surface, 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 with a terminal connected to a power supply line and is electrically connected to the terminal 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 the upper surface thereof, and a locking portion 240b for locking to the inner surface of the frame 210 is provided on the side surface thereof. The bolt block 230 is assembled to the frame 210 as indicated by an arrow, so that the stud bolt 231 protrudes from the upper surface of the frame 210 in a state where the stud bolt 231 is passed through the bolt insertion hole 223a of the bus bar 220. A locking lock (not shown) that locks with the locking portion 240 b of the bolt block 230 is provided on the inner surface of the frame 210.

  In this electrical connection box 201, the terminal connected to the power supply line is overlaid on the terminal connection part 223 exposed from the opening 215, and a nut is screwed onto the stud bolt 231, whereby the terminal is fixed to the frame 210. In addition, the electrical connection state between the terminal and the bus bar 220 is maintained (see Patent Document 1).

JP-A-6-276648

  In the conventional electric junction box 201 described above, when a higher force than expected is applied to the stud bolt 231, the engagement between the engagement portion 240 b of the bolt block 230 and the engagement lock of the frame 210 is released, and the bolt block 230. Has fallen out of the frame 210, making it difficult to repair.

  Therefore, the present invention prevents the bolt block from dropping off from the frame when the lock between the frame and the bolt block is released, and allows the bolt block to return to the normal position again. The purpose is to provide.

  In order to achieve the above object, the invention described in claim 1 is an electrical junction box comprising a frame and a bolt block assembled to the frame, wherein the bolt block has a head and a shaft. And a resin block to which the head portion of the bolt is fixed, and the frame is provided on the inner surface of the surrounding wall and surrounding the resin block from the lower side of the surrounding wall. A locking lock that locks the bolt block inserted inside and supports the bolt block, and a drop-off prevention lock that is provided on the inner surface of the surrounding wall and disposed below the locking lock. And when the locking of the locking block and the bolt block is released and the bolt block is moved below the locking lock, the drop-off prevention lock is By contacting the block an electric connection box, characterized in that to prevent the bolt blocks dropping from the frame.

  The invention described in claim 2 is the invention described in claim 1, further comprising a bus bar which is assembled to the frame and provided with a bolt insertion hole through which the shaft portion is passed. And the bolt block is disengaged, the bolt block moves below the locking lock, and the drop prevention lock is in contact with the bolt block. It is characterized by being positioned above the surface of the bus bar through the hole.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein a pair of slits are provided on both sides of the drop-off prevention lock in the surrounding wall, and the bolt block is connected to the surrounding wall. When inserted inside, the part between the pair of slits in the surrounding wall bends outward.

  According to the invention described in claim 1, the bolt block includes a bolt having a head portion and a shaft portion, and a resin block in which the head portion of the bolt is fixed, and the frame is the resin block. A locking wall that is provided on the inner surface of the surrounding wall and that locks the bolt block inserted into the surrounding wall from below the surrounding wall to support the bolt block; A drop prevention lock provided on an inner surface of the surrounding wall and disposed below the locking lock, wherein the locking between the locking lock and the bolt block is released and the bolt block is locked. When the lock block is moved downward, the bolt block prevents the bolt block from falling off the frame by coming into contact with the bolt block. The bolt block that has moved toward using fingers or pliers, can again returned to the normal position.

  According to the invention described in claim 2, the tip of the shaft portion is positioned above the surface of the bus bar through the bolt insertion hole in a state where the drop-off prevention lock is in contact with the bolt block. Therefore, the bolt block can be returned to the normal position again by gripping and picking up the shaft portion of the bolt block moved below the locking lock with a finger or pliers.

  According to the invention described in claim 3, a pair of slits are provided on both sides of the drop-off prevention lock in the surrounding wall, and the bolt block is inserted into the surrounding wall when the bolt block is inserted inside the surrounding wall. Since the portion between the pair of slits bends outward, workability when the bolt block is assembled to the frame can be improved.

It is a perspective view which shows the electrical junction box concerning one Embodiment of this invention. It is sectional drawing along the AA line in FIG. It is sectional drawing along the BB line in FIG. It is explanatory drawing explaining the method to assemble | attach the bolt block shown by FIG. 1 to a cassette block. It is sectional drawing which shows the state which the volt | bolt block shown by FIG. 2 moved below the latching lock. 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 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 includes an outer case (not shown) made of synthetic resin, a cassette block 5 assembled in the outer case, a bolt block 2 assembled in the cassette block 5, a cassette A bus bar 7 assembled to the block 5, a plurality of electronic components (not shown) such as relays, fuses, and connectors, and an upper cover (not shown) that is assembled to the outer case and covers the upper surface of the cassette block 5. ing.

  The outer case and the cassette block 5 constitute a “frame” recited in the claims. In the present embodiment, the outer case and the cassette block 5 are formed separately. However, in the present invention, the outer case and the cassette block 5 may be formed integrally.

  The cassette block 5 is made of a synthetic resin and is formed in a block shape. The cassette block 5 is provided with a bolt block mounting portion 6 to which the bolt block 2 is mounted and an electronic component mounting portion 8 to which a plurality of electronic components such as relays, fuses, and connectors are mounted. Further, a locking portion 9 that locks to the outer case is provided on the side surface of the cassette block 5. The configuration of the bolt block mounting portion 6 will be described later.

  As shown in FIG. 4 and the like, the bolt block 2 includes a metal bolt 3 having a head portion 31 and a shaft portion 32, and a substantially rectangular resin block 4 to which the head portion 31 of the bolt 3 is fixed. ing. When the bolt block 2 is mounted on the bolt block mounting portion 6, the top surface of the cassette block 5 with the shaft portion 32 being passed through the bolt insertion hole 70 provided in the bus bar 7 as shown in FIG. 1. Protrude from. Such a bolt block 2 fixes a terminal (not shown) and a bus bar 7 positioned between the nut and the head 31 by screwing a nut (not shown) to the shaft portion 32 and the terminal. The electrical connection state with the bus bar 7 is maintained. Moreover, the said terminal is a terminal connected to the edge part of the power wire which supplies electric power to the bus bar 7 of the electrical connection box 1 from power supplies, such as a battery and an alternator.

  The bus bar 7 is a wiring member that branches an electric power input by being electrically connected to a terminal connected to a power line into a plurality of electric wires (not shown) via relays, fuses, connectors, etc. It is obtained by subjecting to press working or the like. As shown in FIG. 3 and the like, the bus bar 7 is positioned at the bolt block mounting portion 6 and overlapped with a terminal connected to a power supply line to be electrically connected to the terminal, and an electronic component mounting There is provided an electronic component connecting portion 72 that is positioned in the portion 8 and is electrically connected to electronic components such as relays, fuses, and connectors. Further, the terminal connection portion 71 is formed in a plate shape and is provided with a bolt insertion hole 70.

  As shown in FIGS. 2 and 3, the bolt block mounting portion 6 is provided on the surrounding wall 10 that surrounds the resin block 4 of the bolt block 2 and the inner surface of the surrounding wall 10. A pair of locking locks 11 that are locked to and supported by the bolt block 2 inserted inside 10, and a dropout that is provided on the inner surface of the surrounding wall 10 and disposed below the locking lock 11. And a prevention lock 12.

  The surrounding wall 10 is composed of four walls and is formed in a rectangular tube shape. As shown in FIG. 2, the pair of locking locks 11 is provided one by one on two opposing walls of the surrounding wall 10. The pair of locking locks 11 are formed in an elastically deformable arm shape and extend obliquely upward from the inner surface of the surrounding wall 10. The pair of locking locks 11 support the bolt block 2 by the tips of the locking locks 11 being locked to the lower end of the resin block 4.

  One drop prevention lock 12 is provided on the wall of the surrounding wall 10 where the locking lock 11 is not provided. As shown in FIGS. 2 and 3, the drop-off prevention lock 12 is not in contact with the bolt block 2 in a state where the bolt block 2 is supported by the pair of locking locks 11. As shown in FIG. 5, such a fall-off prevention lock 12 is provided when the engagement between the pair of locking locks 11 and the resin block 4 is released and the bolt block 2 moves below the pair of locking locks 11. The bolt block 2 is prevented from falling off the cassette block 5 by coming into contact with the lower surface of the resin block 4.

  Further, as shown in FIG. 5, the drop-off prevention lock 12 is configured such that the tip of the shaft portion 32 is passed through the bolt insertion hole 70 in a state where the drop-off prevention lock 12 is in contact with the lower surface of the resin block 4. It is provided at a position positioned above the surface of 71.

  Further, a pair of slits 13 are provided on both sides of the falling prevention lock 12 in the surrounding wall 10. Thus, when the bolt block 2 is inserted inside the surrounding wall 10, a portion between the pair of slits 13 in the surrounding wall 10 is pressed by the bolt block 2 and bent outward.

  Then, the assembly procedure of the electrical junction box 1 mentioned above is demonstrated with reference to FIG. First, the bus bar 7 is assembled to the cassette block 5 separated from the outer case. Next, the electronic component described above is mounted on each electronic component mounting portion 8, and the electronic component is electrically connected to the electronic component connecting portion 72 of the bus bar 7.

  Next, as shown by arrow C in FIG. 4, the bolt block 2 is inserted into the surrounding wall 10 from below the cassette block 5. At this time, first, the resin block 4 comes into contact with the drop-off prevention lock 12, and a portion between the pair of slits 13 in the surrounding wall 10 bends outside the surrounding wall 10. Then, by further inserting the bolt block 2 upward, the bolt block 2 gets over the drop-off prevention lock 12 and is restored to the state before the portion between the pair of slits 13 in the surrounding wall 10 is bent.

  Then, by further inserting the bolt block 2 upward, the bolt block 2 passes between the pair of locking locks 11 while deflecting the pair of locking locks 11 toward the surrounding wall 10, and the pair of locking locks. 11 is engaged with the lower end of the resin block 4. In this way, the bolt block 2 is mounted on the bolt block mounting portion 6. Further, when the bolt block 2 is mounted on the bolt block mounting portion 6, the shaft portion 32 is passed through the bolt insertion hole 70 of the terminal connection portion 71.

  Next, the cassette block 5 is assembled in the outer case. Then, the terminal connected to the power supply line is overlapped on the terminal connecting portion 71 and a nut is screwed onto the shaft portion 32 to electrically connect the terminal and the terminal connecting portion 71. Finally, attach the upper cover to the outer case. The electrical junction box 1 is assembled through such a procedure.

  Further, in the electrical junction box 1, a higher force than expected is applied to the shaft portion 32 during assembly or transportation, and the engagement between the pair of locking locks 11 and the resin block 4 is released and the bolt block 2 may move below the pair of locking locks 11. In that case, the bolt block 2 is stopped without falling off from the cassette block 5 by the drop-off preventing lock 12, so that the pair of parts can be separated by gripping and picking up the shaft portion 32 from the upper surface side of the cassette block 5 with a finger or pliers. The locking lock 11 and the resin block 4 can be locked again.

  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.

1 Electrical connection box 2 Bolt block 3 Bolt 4 Resin block 5 Cassette block (frame)
DESCRIPTION OF SYMBOLS 10 Surrounding wall 11 Locking lock 12 Drop-off prevention lock 13 Slit 31 Head 32 Shaft

Claims (3)

In an electrical junction box comprising a frame and a bolt block assembled to the frame,
The bolt block is composed of a bolt having a head portion and a shaft portion, and a resin block fixing the head portion of the bolt.
The frame is provided on an enclosure wall that surrounds the resin block, and an inner surface of the enclosure wall, and is engaged with the bolt block that is inserted from the lower side of the enclosure wall to the inside of the enclosure wall. A locking lock for supporting, and a drop-off preventing lock provided on the inner surface of the surrounding wall and disposed below the locking lock;
When the locking between the locking lock and the bolt block is released and the bolt block moves below the locking lock, the drop prevention lock comes into contact with the bolt block so that the bolt block is moved to the frame. An electrical junction box characterized in that it is prevented from falling off. The bus bar further includes a bus bar provided with a bolt insertion hole through which the shaft portion is passed while being assembled to the frame,
In a state where the locking between the locking lock and the bolt block is released, the bolt block moves below the locking lock, and the drop prevention lock is in contact with the bolt block, the tip of the shaft portion is The electrical connection box according to claim 1, wherein the electrical connection box is positioned above the surface of the bus bar through the bolt insertion hole. A pair of slits are provided on both sides of the drop-off prevention lock in the surrounding wall,
The electrical junction box according to claim 1 or 2, wherein when the bolt block is inserted inside the surrounding wall, a portion between the pair of slits in the surrounding wall is bent outward.

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