JP2011223777A - Bolt block mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt block mounting structure capable of preventing a bolt block from dropping from a case when screwing a nut to a bolt.SOLUTION: In a bolt block mounting structure 10 for mounting a bolt block 1 to a cassette block 2, a bus bar 5 of the bolt block 1 prior to being mounted to the cassette block 2 includes: a connecting part 51 overlapped on an upper surface 31 of a mounting member 3; a supporting part holding the mounting member 3 with the connecting part 51; and a cantilever deformable piece 54 extending along side surfaces 33, 34 of the mounting member 3. The bolt block 1 is positioned from a lower side of the cassette block 2 through an opening 23 onto an upper surface 21 of the cassette block 2. Furthermore, when screwing a nut 8 to a bolt 4 protruded from the upper surface 31 of the mounting member 3, the deformable piece 54 is pushed by the mounting member 3 which is rotated around an axis of the bolt 4, and is plastically deformed and positioned on an edge 24 surrounding the opening 23.

Description

  The present invention relates to a bolt block mounting structure for mounting a bolt block electrically connected to a terminal of a power cable to a case of an electrical junction box.

  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. This electrical connection box has various configurations. For example, an electrical connection having a structure in which a bolt block that is electrically connected to a terminal of a power cable is attached to a cassette block that constitutes a case of the electrical connection box. A box is known (see Patent Document 1). FIG. 6 is a cross-sectional perspective view showing a bolt block mounting structure in a conventional electrical junction box. FIG. 7 is an exploded view of the bolt block shown in FIG.

  The bolt block mounting structure 210 shown in FIGS. 6 and 7 is a mounting structure for mounting the bolt block 201 electrically connected to the LA terminal connected to the terminal of the power cable to the cassette block 202 constituting the case of the electrical junction box. It is.

  The cassette block 202 is formed in a block shape from a synthetic resin. On the upper surface 221 of the cassette block 202, a mounting portion 222 to which electrical components such as relays and fuses are mounted is provided. Further, the cassette block 202 has an opening 223 that opens to the upper surface 221 and is positioned inside the bolt block 201, and a pair of locking arms 225 that are locked to the bolt block 201 positioned inside the opening 223. And are provided.

  The bolt block 201 includes a block-shaped attachment member 203, a bolt 204 attached to the attachment member 203, and a bus bar 205 attached to the attachment member 203.

  The mounting member 203 is made of synthetic resin, and includes a mounting member main body 230 that houses and mounts the head portion 242 of the bolt 204, a pair of locking protrusions 231 that protrude from both side surfaces of the mounting member main body 230, Is provided. Further, the pair of locking projections 231 are locked to the pair of locking arms 225 provided on the cassette block 202.

  The bolt 204 is provided with a head 242 accommodated in the attachment member main body 230 and a shaft portion 241 protruding from the upper surface of the attachment member main body 230.

  The bus bar 205 is a wiring member of an electrical connection box obtained by pressing a metal plate. As shown in FIG. 7, the bus bar 205 includes a connection portion 251 that is overlaid on the upper surface of the mounting member main body 230 and a plurality of component connection portions 256 that are connected to electrical components that are attached to the attachment portion 222 of the cassette block 202. And an accommodating portion 257 that couples the connecting portion 251 and the plurality of component connecting portions 256 and is accommodated in the cassette block 202. The connecting portion 251 is provided with a through hole 252 through which the shaft portion 241 of the bolt 204 is passed.

  In the bolt block 201 having the above-described configuration, the bolt 104 is attached to the attachment member 203, and the connection portion 251 of the bus bar 205 is overlaid on the upper surface of the attachment member main body 230, as shown in FIG. 6, the housing portion 257 of the bus bar 205 is housed inside the cassette block 202 and the pair of locking projections 231 are locked to the pair of locking arms 225. Is attached to the cassette block 202 as shown in FIG. In addition, the bolt block 201 is attached to the cassette block 202, and the connection portion 251 is positioned on the upper surface 221 of the cassette block 202.

  Further, after the bolt block 201 is attached to the cassette block 202, the LA terminal connected to the terminal of the power cable is overlapped on the connection part 251 and the shaft part through the through hole provided in the LA terminal is passed. When the nut is screwed to 241, the LA terminal is attached with the LA terminal sandwiched between the nut and the connecting portion 251 and is electrically connected to the LA terminal.

JP-A-6-276648

  However, in the bolt block mounting structure 210 shown in FIGS. 6 and 7, the pair of locking projections 231 and the pair of locking projections 231 are caused by a load applied to the mounting member 203 when the nut is screwed onto the shaft portion 241 of the bolt 204. There is a problem in that the locking with the pair of locking arms 225 is released and the bolt block 201 may drop from the cassette block 202 in the direction of arrow C in FIG.

  Therefore, an object of the present invention is to provide a bolt block mounting structure capable of preventing the bolt block from falling off the case when the nut is screwed onto the bolt.

  In order to achieve the above object, the invention described in claim 1 is provided with a block-shaped attachment member, a bolt projecting from the upper surface of the attachment member, and a bus bar attached to the attachment member in the case of the electrical junction box. In the bolt block mounting structure for mounting the bolt block, the mounting between the connection portion overlapped on the upper surface of the mounting member on the bus bar of the bolt block before being attached to the case and the connection portion. A cantilever in which one end portion extending in a direction perpendicular to the direction in which the connection portion and the support portion face each other is connected to the connection portion or the support portion. The case is provided with an opening that opens on the upper surface of the case, and the case is passed through the opening from the lower side of the case. When the nut is screwed onto the bolt of the bolt block positioned on the top surface of the bolt block, the deformation piece is pressed against the side surface of the mounting member that rotates about the axis of the bolt together with the nut. The bolt block mounting structure is characterized in that the deformable piece is plastically deformed and positioned on an edge surrounding the opening of the case.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, a pair of the deformation pieces are provided at positions where the attachment members are positioned between each other.

  According to the invention described in claim 1, the attachment between the connection portion overlapped on the upper surface of the attachment member on the bus bar of the bolt block before being attached to the case and the connection portion. A cantilever in which one end portion extending in a direction perpendicular to the direction in which the connection portion and the support portion face each other is connected to the connection portion or the support portion. The case is provided with an opening that opens on the upper surface of the case, and is positioned on the upper surface of the case through the opening from the lower side of the case. When the nut is screwed onto the bolt of the bolt block, the deformable piece is plastically deformed by being pressed against the side surface of the mounting member that rotates around the axis of the bolt together with the nut. Since it is positioned on the edge surrounding the opening of the case, the bolt block is dropped from the case when the nut is screwed onto the bolt by the deformation piece positioned on the edge surrounding the opening. Can be prevented.

  According to the invention described in claim 2, since the pair of deformation pieces are provided at positions where the mounting member is positioned between each other, the pair of deformations positioned on the edge surrounding the opening. The piece can reliably prevent the bolt block from falling off the case when the nut is screwed onto the bolt.

It is a top view which shows the attachment structure of the volt | bolt block concerning one embodiment of this invention, and is a figure which shows the state before a nut is screwed together by the volt | bolt of the volt | bolt block located in the upper surface of a cassette block. It is a perspective view which shows the state before the bolt block shown by FIG. 1 is attached to a cassette block. FIG. 3 is an enlarged perspective view of the bolt block shown in FIG. 2. It is the perspective view which expanded the bolt block shown by FIG. It is explanatory drawing explaining the effect | action of the deformation | transformation piece of a bolt block shown by FIG. It is a cross-sectional perspective view which shows the attachment structure of the bolt block in the conventional electrical junction box. FIG. 7 is an exploded view of the bolt block shown in FIG. 6.

  A bolt block mounting structure 10 according to an embodiment of the present invention will be described with reference to FIGS. The bolt block mounting structure 10 of the present invention is a mounting structure for mounting the bolt block 1 electrically connected to the LA terminal 7 connected to the terminal of the power cable 6 to the cassette block 2 constituting the case of the electrical junction box. It is. That is, the bolt block mounting structure 10 includes the cassette block 2 and the bolt block 1.

  The “electric connection box” is mounted on a car and supplies power and transmits signals to an electronic device mounted on the car. The “case of the electrical junction box” includes a case main body (not shown) and a cassette block 2 accommodated in the case main body.

  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.

  The power cable 6 is a thick electric wire that is connected to a battery, an alternator, or the like mounted on an automobile and through which a large current flows. As shown in FIG. 4, the power cable 6 is provided with a core wire 61 and an insulating coating 62 covering the core wire 61.

  The LA terminal 7 is a terminal obtained by pressing a thick metal plate or the like. As shown in FIG. 4, a pair of crimping pieces 73 for crimping the core wire 61 of the power cable 6 and an insulating coating 62 are provided. A pair of caulking pieces 74 for caulking and a mating side connection portion 71 that is overlapped with the connection portion 51 and electrically connected to the connection portion 51 are provided. The counterpart connection portion 71 is formed in a flat plate shape, and a through hole 72 is provided in the center thereof.

  As shown in FIGS. 1 and 2, the cassette block 2 is formed in a block shape from a synthetic resin. On the upper surface 21 of the cassette block 2, a mounting portion 22 to which electrical components such as a relay and a fuse are mounted is provided. Further, the cassette block 2 is provided with an opening 23 that opens to the upper surface 21 and through which the bolt block 1 passes. The opening 23 has a square shape in plan view. That is, the opening 23 is formed by being surrounded by four straight edges. Among these four edges, reference numeral 24 is attached to a pair of edges opposed to each other in the width direction of the opening 23, that is, the arrow Z direction. The pair of edges 24 are formed at a position lower than the upper surface 21. That is, a step is formed between the upper surface 21 and the pair of edges 24.

  1 to 4 indicate the longitudinal direction of the opening 23, the arrow Z indicates the width direction of the opening 23, and the arrow Y indicates the height of the cassette block 2. The direction is shown. In the present invention, “upper side” means the upper side in the arrow Y direction in the paper plane direction, and “lower side” means the lower side in the arrow Y direction in the paper plane direction.

  The bolt block 1 includes a block-shaped attachment member 3, a bolt 4 attached to the attachment member 3, and a bus bar 5 attached to the attachment member 3.

  The mounting member 3 is made of synthetic resin. As shown in FIGS. 3 and 4, the cassette block 2 is attached to the cassette block 2 with the bolt block 1 passing through the inside of the opening 23. A block provided with a flat upper surface 31 positioned on the upper surface 21 side, a lower surface 32 opposite to the upper surface 31, and four flat side surfaces 33, 34, 35, 36 intersecting the upper surface 31 and the lower surface 32. It is formed in a shape. Further, the side surface 33 and the side surface 34 face each other, and the side surface 35 and the side surface 36 face each other. The attachment member 3 attaches the bolt 4 by accommodating the head portion 42 of the bolt 4 therein. Further, in the bolt 4 in which the head portion 42 is accommodated in the mounting member 3, the shaft portion 41 projects from the upper surface 31. The shaft portion 41 is a male screw formed in a columnar shape and having a spiral groove cut in the outer peripheral surface.

  The bus bar 5 is a wiring member of an electrical connection box obtained by pressing a metal plate. In the present embodiment, a metal plate having a plate thickness of about 0.8 mm is used. As shown in FIGS. 3 and 4, the bus bar 5 includes a connecting portion 51, a supporting portion 53, a connecting portion 55, a pair of deformation pieces 54, a plurality of component connecting portions 56, and a receiving portion 57. Are integrally provided.

  The connecting portion 51 is formed in a plate shape having a rectangular planar shape, and a through hole 52 through which the shaft portion 41 of the bolt 4 is passed is provided at the center. The connecting portion 51 is overlaid on the upper surface 31 of the attachment member 3 in a state where the bolt 4 is attached, and positions the shaft portion 41 in the through hole 52. In addition, the other-side connection portion 71 of the LA terminal 7 described above is superimposed on the connection portion 51.

  As shown in FIG. 3, the support portion 53 is stacked on the lower surface 32 of the attachment member 3, and holds the attachment member 3 with the attachment member 3 sandwiched between the connection portion 51.

  As shown in FIG. 3, the connecting portion 55 is a portion where the connecting portion 51 and the support portion 53 are connected. The connecting portion 55 is opposed to the side surface 35 of the mounting member 3 with a gap.

  As shown in FIG. 4, the pair of deformation pieces 54 extend in a band shape along the flat side surfaces 33 and 34 of the mounting member 3 that face each other, and the connection portion 51 and the support portion 53 face each other. One end portion 54a in the orthogonal direction is connected to the connection portion 51, and the other end portion 54b is formed as a free end. Further, the other end portion 54 b of the one deformable piece 54 extending along the side surface 33 is positioned in the vicinity of the end portion of the side surface 33 on the side surface 35 side. The other deformed piece 54 extending along the side surface 34 has the other end portion 54 b positioned in the vicinity of the end portion of the side surface 34 on the side surface 36 side.

  The component connecting portion 56 is a portion connected to an electrical component mounted on the mounting portion 22 of the cassette block 2.

  The accommodating portion 57 is a portion where the connecting portion 51 and the plurality of component connecting portions 56 are connected. The accommodating portion 57 is accommodated in the cassette block 2 and attached to the cassette block 2.

  The bolt block 1 having the above configuration is assembled by attaching the bus bar 5 to the attachment member 3 after the bolt 4 is attached to the attachment member 3. Further, before the bus bar 5 is attached to the attachment member 3, the connecting portion 55 and the support portion 53 are flush with each other. In such a bus bar 5, the connecting portion 51 is superimposed on the upper surface 31 of the mounting member 3, the shaft portion 41 of the bolt 4 is passed through the through hole 52, and the pair of deformed pieces 54 are formed on the side surfaces 33 and 34 of the mounting member 3. After being overlapped, the boundary portion between the connecting portion 55 and the support portion 53 is bent so that the attachment member 3 is sandwiched between the connection portion 51 and the support portion 53, so that the attachment member 3 is attached.

  Further, as shown in FIG. 2, the bolt block 1 assembled as described above has a direction in which the direction in which the pair of deformed pieces 54 oppose each other is the width direction of the opening 23, and from the lower side of the cassette block 2. The connecting portion 51 is positioned on the same plane as the upper surface 21 of the cassette block 2 through the opening 23 and the housing portion 57 of the bus bar 5 being housed inside the cassette block 2 and attached to the cassette block 2. In this state, it is attached to the cassette block 2. Further, in this state, the pair of deformation pieces 54 are positioned above the pair of edges 24, that is, on the upper surface 21 side.

  Further, as shown in FIGS. 4 and 5, the bolt block 1 attached to the cassette block 2 is overlapped with the mating connection portion 71 of the LA terminal 7 on the connection portion 51, as described above. When the nut 8 is screwed into the shaft portion 41 passed through the through hole 72 of the 71, the LA terminal 7 is attached with the counterpart connection portion 71 sandwiched between the nut 8 and the connection portion 51, and the LA It is electrically connected to the terminal 7. In FIG. 5, the LA terminal 7 sandwiched between the connecting portion 51 and the nut 8 is omitted to describe the shape of the deformable piece 54.

  Further, in the bolt block 1, when the nut 8 is screwed to the shaft portion 41 of the bolt 4 as described above, the bolt 4 and the mounting member 3 rotate around the axis of the bolt 4 together with the nut 8. Moreover, in this embodiment, it rotates about 15 degree | times. As a result, the pair of deformable pieces 54 are pushed and plastically deformed by the side surfaces 33 and 34 of the rotating mounting member 3 and are respectively positioned on the edges 24 surrounding the opening 23 as shown in FIG.

  In the present invention, the mounting member 3 is not held in the cassette block 2 by a locking arm or the like which is a resin member as in the conventional example, but as described above, between the connection portion 51 and the support portion 53. Since the attachment member 3 is held by being sandwiched between the two, the attachment member 3 can be rotated when the nut 8 is screwed as described above.

  Thus, according to the bolt block mounting structure 10 of the present invention, when the nut 8 is screwed onto the bolt 4, the pair of deformation pieces 54 are pushed by the mounting member 3 and surround the opening 23. Therefore, the load applied to the mounting member 3 when the nut 8 is screwed can be received by the pair of deformation pieces 54 having higher strength than the resin member. Therefore, it is possible to prevent the bolt block 1 from dropping from the cassette block 2 when the nut 8 is screwed onto the bolt 4.

  In the above-described embodiment, the “electric connection box case” is composed of the case main body (not shown) and the cassette block 2 accommodated in the case main body. The case main body may be formed integrally with the case body and the cassette block.

  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 Bolt block 2 Cassette block (case)
DESCRIPTION OF SYMBOLS 3 Mounting member 4 Bolt 5 Bus bar 8 Nut 10 Bolt block mounting structure 21 Upper surface 23 Opening part 24 Edge 31 Upper surface 33,34 Side surface 51 Connection part 53 Support part 54 Deformation piece

Claims (2)

In a bolt block mounting structure for mounting a bolt block provided with a block-shaped mounting member, a bolt protruding from the upper surface of the mounting member, and a bus bar attached to the mounting member to the case of the electrical junction box,
The bus bar of the bolt block before being attached to the case, a connection portion superimposed on the upper surface of the attachment member, a support portion sandwiching the attachment member between the connection portions, and the attachment member A cantilevered deformation piece extending along a side surface and having one end portion in a direction orthogonal to a direction in which the connection portion and the support portion face each other, connected to the connection portion or the support portion;
The case is provided with an opening that opens on the upper surface of the case, and
The attachment that rotates around the axis of the bolt together with the nut when the nut is screwed into the bolt of the bolt block that is positioned on the upper surface of the case through the opening from the lower side of the case The bolt block mounting structure, wherein the deformable piece is plastically deformed and positioned on an edge surrounding the opening of the case when the deformable piece is pressed against the side surface of the member. 2. The bolt block mounting structure according to claim 1, wherein a pair of the deformable pieces are provided at positions where the mounting member is positioned between them.

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