JP2018107953A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box that is able to prevent a bolt attached to a bolt block from falling due to external force.SOLUTION: In an electric connection box 1, a bolt 10 has: a fastening part 10a by which a bus bar 12 and a terminal 40 can be fastened; and a seat part 10b having at least a pair of opposite faces 104a, 104b at an axial end of the fastening part 10a and in a direction orthogonal to the axial direction. The bolt block 32 has a side opening 2d for accommodating the seat part 10b of the bolt 10 in a seat accommodating part 2e. The bus bar 12 has a regulating part 120 provided so as to block all or part of side opening 2d. The regulating part 120 regulates rotation of the seat part 10b such that, with respect to rotation around the axial direction of the bolt 10, an opposite face 104a of the seat part 10b opposes the direction of the rotation.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electrical junction box.

  Conventionally, electrical connection boxes (junction boxes, fuse boxes, relay boxes, etc.) that are mounted on vehicles such as automobiles and collect and house connection components such as wire harnesses and electronic components such as fuses and relays. )It has been known. In such an electrical junction box, for example, as in Patent Document 1, a bolt block including a block-shaped attachment member, a bolt protruding from the upper surface of the attachment member, and a bus bar attached to the attachment member is provided. There is something to have.

  Patent Document 2 discloses a fusible link-integrated bolt block in which a fuse terminal is arranged on the bolt block and the fusible link is integrated with the bolt block.

JP 2011-223777 A JP2013-55722A

  By the way, when attaching a bolt to a bolt block, the bolt block needs at least one opening. When an external force is applied to the bolt attached to the bolt block, the bolt may drop out from the opening of the bolt block, so there is room for improvement.

  An object of the present invention is to provide an electrical junction box that can prevent a bolt attached to a bolt block from falling off due to an external force.

  In order to achieve the above object, an electrical junction box according to the present invention includes a resin casing, a terminal attached to the casing and connected to a power source side of the vehicle, and connected to a load side of the vehicle. A fixing member that fastens the terminal to be connected, and a conductive material that is fixed to the housing and has conductivity, and the fixing member includes a shaft-shaped fastening portion that can fasten the terminal; A base portion having at least a pair of opposed surfaces in a direction orthogonal to the axial direction at an end portion in the axial direction of the fastening portion, and the housing includes a housing portion for accommodating the base portion of the fixing member. The conductor has a restricting portion provided so as to close all or part of the opening, and the restricting portion is centered on the axial direction of the fixing member. Of the pair of opposed surfaces in the pedestal portion, It is facing surfaces facing the direction of rotation, and characterized by regulating the rotation of the pedestal.

  In the electrical junction box, the restricting portion is electrically connected to the fixing member and has a flat plate-like connecting portion having a through hole through which the fastening portion of the fixing member passes, and an end portion of the connecting portion. It is preferable to have an abutting portion that bends toward the opening and abuts against one of the opposing surfaces.

  According to the electrical junction box according to the present invention, it is possible to prevent the bolt attached to the bolt block from falling off due to an external force.

FIG. 1 is an exploded perspective view illustrating a schematic configuration of an electrical junction box according to the embodiment. FIG. 2 is a partially enlarged view of a bolt block constituting the electrical junction box according to the embodiment. FIG. 3 is a partially enlarged view of the bolt block constituting the electrical junction box according to the embodiment. FIG. 4 is a partially enlarged view of a bolt block constituting the electrical junction box according to the embodiment. FIG. 5 is a partially enlarged view of the bolt block constituting the electrical junction box according to the embodiment. FIG. 6 is a partial vertical cross-sectional view taken along line AA shown in FIG. FIG. 7 is a schematic diagram illustrating an example of the movement of the pedestal portion of the bolt in the bolt block.

  Hereinafter, an electrical junction box according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by embodiment shown below. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment]
FIG. 1 is an exploded perspective view illustrating a schematic configuration of an electrical junction box according to the embodiment. FIG. 2 is a partially enlarged view of a bolt block constituting the electrical junction box according to the embodiment. FIG. 3 is a partially enlarged view of the bolt block constituting the electrical junction box according to the embodiment. FIG. 4 is a partially enlarged view of a bolt block constituting the electrical junction box according to the embodiment. FIG. 5 is a partially enlarged view of the bolt block constituting the electrical junction box according to the embodiment. FIG. 6 is a partial vertical cross-sectional view taken along line AA shown in FIG. FIG. 7 is a schematic diagram illustrating an example of the movement of the pedestal portion of the bolt in the bolt block. 3 shows a state where the bus bar is attached to the bolt block, and FIG. 4 shows a state where the bus bar is removed from the bolt block. FIG. 5 shows a state in which the bolt is accommodated in the bolt block. FIG. 7 shows the movement of the pedestal in the bolt block when an external force generated when a nut is tightened on the bolt is applied to the bolt. Here, the vertical direction in each figure is the vertical direction or the axial direction of the bolt in a state where the electrical junction box is arranged in the engine room or the like, and one is the upper side and the other is the lower side.

  The electrical junction box 1 according to the present embodiment is installed in, for example, an engine compartment (engine room) or a vehicle interior side of a vehicle such as an automobile, is incorporated in a wire harness, and is installed in a vehicle with a power source such as a battery or an alternator. Connected to various loads (for example, electronic devices) and distributes the electric power supplied from the power source to the various loads in the vehicle. The electrical junction box 1 may be called a junction box, a fuse box, a relay box, or the like. In the present embodiment, these are collectively called an electrical junction box.

  Here, the wire harness is, for example, a bundle of a plurality of electric wires used for power supply and signal communication for connection between devices mounted on a vehicle to form a collective part, and a plurality of electric wires are once connected with a connector or the like. Are connected to each device. The wire harness includes a plurality of electric wires and an electric connection box 1 electrically connected to the electric wires. An electric wire is comprised including the conductor part (core wire) which twisted together the some electroconductive metal strand, and the insulating coating | coated part which covers the outer side of the said conductor part, for example. In the wire harness, the electrical connection box 1 is electrically connected to the ends of the bundled and bundled electric wires via connectors or the like as connection portions. In addition to this, the wire harness may further include a grommet, a protector, a fixture, and the like.

  The electrical junction box 1 includes a frame 3, an upper cover 5, a lower cover 7, and a side cover 9 as a housing 2. The electrical junction box 1 has a three-layer divided structure in which the frame 3, the upper cover 5, and the lower cover 7 are divided. The frame 3, the upper cover 5, the lower cover 7, and the side cover 9 are formed of an insulating synthetic resin. The electrical connection box 1 has an opening on the upper side in the vertical direction of the frame 3 facing the upper cover 5, an opening on the lower side in the vertical direction of the frame 3 facing the lower cover 7, and the upper cover 5 with respect to the frame 3. The lower cover 7 is attached. In the electrical junction box 1, the upper cover 5 and the lower cover 7 are locked to the frame 3 through various types of locking mechanisms. The electrical junction box 1 has various electronic components 4 such as connectors, fuses, relays, branching units, and electronic control units, and a bus bar 12 used for a fusible link circuit configuration interposed between a power source and a load. Accommodate.

  The frame 3 is formed in a cylindrical frame shape having openings on two upper and lower surfaces in the vertical direction. The frame 3 is a member to which the electronic component 4 and the bus bar 12 are mainly attached. The upper cover 5 is a lid-like member that closes an opening located on the upper side in the vertical direction of the frame 3. The lower cover 7 is a dish-shaped (tray-shaped) member that closes an opening located on the lower side in the vertical direction of the frame 3. The side cover 9 is a wall-like member that closes an opening on the side surface of the frame 3 (for example, an opening located in a direction perpendicular to the vertical direction in a state where the electrical connection box 1 is connected to an engine room or the like). As shown in FIG. 1, the frame 3 mainly serves as a connection part 30 to which the electronic component 4 is attached, a bus bar 12 connected to various loads, and a power supply line 42. It is divided into a bolt block 32.

  As shown in FIGS. 2 to 6, the bolt block 32 includes a top opening 2 b, a side opening 2 d, and a pedestal accommodating part 2 e as holding parts for holding the bolts 10. The upper surface opening 2b is provided on the upper surface 2a of the frame 3 and opens upward in the vertical direction. The upper surface opening 2b has a keyhole shape in which a shape viewed from the upper side connects a circular hole and a triangular notch. The side opening 2d is provided on the side 2c of the frame 3 and opens in a direction orthogonal to the vertical direction. The side opening 2d has a rectangular shape having a notch on one of a pair of long sides when viewed from the side. The upper surface opening 2b and the side surface opening 2d have a notch shared at each end, and are formed in communication with each other. The pedestal accommodating portion 2e has an upper surface opening 2b on the upper surface 2a side and a side surface opening 2d on the side surface 2c side. The pedestal accommodating portion 2e accommodates the bolt 10 through the side opening 2d.

  The bolt 10 is a fixing member, and is a metal pedestal bolt provided with a stepped pedestal at one end. The bolt 10 is attached to the bolt block 32 and electrically connects the terminal 40 connected to the power source side of the vehicle and the bus bar 12 connected to the load side of the vehicle by fastening with a hexagon nut 44. The terminal 40 is a crimp terminal in which a flat plate made of a conductive material such as metal is formed in an inverted L shape, and is crimped to the end of the power line 42. The power line 42 is an electric wire connected to a power source such as a battery or an alternator in the vehicle.

  The bolt 10 includes a fastening portion 10a and a pedestal portion 10b. The fastening portion 10a is a shaft-like portion into which the hexagon nut 44 is screwed, and is erected on the axially upper side of the bolt 10 from the pedestal portion 10b. The fastening portion 10 a is formed so that the hexagon nut 44 can be screwed together, and the fastened member can be fastened by screwing with the hexagon nut 44. Examples of the members to be fastened include the terminal 40 and the bus bar 12. The pedestal portion 10b has a stepped shape. Specifically, the pedestal portion 10b includes a cylindrical pedestal portion 102 and a rectangular pedestal portion 104, and has a shape in which the cylindrical pedestal portion 102 and the rectangular pedestal portion 104 are overlapped in the axial direction. The cylindrical pedestal portion 102 has a cylindrical shape when viewed from the upper side in the axial direction, and is formed on the upper side in the axial direction of the pedestal portion 10b. The columnar pedestal portion 102 has a fastening portion 10a erected upward in the axial direction. The rectangular pedestal 104 has a rectangular parallelepiped shape when viewed from the upper side in the axial direction, and is formed on the lower side in the axial direction of the pedestal 10b. As shown in FIG. 6, the rectangular pedestal portion 104 has a circular recess formed from the bottom surface toward the upper side in the axial direction. The rectangular pedestal 104 is at one end in the axial direction and has at least a pair of opposing surfaces 104a and 104b in a direction orthogonal to the axial direction. As shown in FIG. 4, the pair of opposing surfaces 104a and 104b is in a state where either one of the pedestal portion 10b is in surface contact with the inner wall surface of the pedestal storage portion 2e in a state where the pedestal portion 10b is stored in the pedestal storage portion 2e. The other is exposed through the side opening 2d. That is, when the facing surface 104b is in surface contact with the inner wall surface in the depth direction of the pedestal housing portion 2e (for example, the direction from the side opening 2d to the inside of the frame 3 in the direction orthogonal to the axial direction) 104a is exposed from the side opening 2d.

  The bus bar 12 is a conductor having conductivity and is fixed to the frame 3. The bus bar 12 is electrically connected to the electronic component 4 mounted on the component mounting unit 30 and is also electrically connected to the bolt 10. The bus bar 12 includes a restricting portion 120 that extends from the component mounting portion 30 to the bolt block 32. The restricting portion 120 is electrically connected to the pedestal portion 10 b of the bolt 10 when the hexagon nut 44 is screwed and fastened to the bolt 10 attached to the bolt block 32. As shown in FIG. 3, the restricting portion 120 closes the entire side opening 2 d in a state where the bus bar 12 is attached to the bolt block 32. With respect to rotation around the axial direction of the bolt 10, the restricting portion 120 is such that one of the opposed surfaces 104 a of the pedestal portion 10 b faces the rotation direction and the rotation of the pedestal portion 10 b. To regulate. As shown in FIG. 3, the restricting portion 120 includes a connecting portion 120a and a contact portion 120b. The connection part 120 a is a part that is electrically connected to the bolt 10. The connection part 120a has a through hole 120aa through which the fastening part 10a of the bolt 10 is inserted. The contact portion 120b bends from the end of the connection portion 120a toward the side opening 2d and contacts the opposing surface 104a.

  In the electrical junction box 1 having the above configuration, the bolt 10 is accommodated in the pedestal accommodating portion 2e through the side opening 2d in the pedestal portion 10b in the direction of the arrow shown in FIG. At this time, it is preferable that the pedestal 10 b is press-fitted into the bolt block 32. The bolt 10 is pushed in until the opposing surface 104b of the pedestal portion 10b contacts the inner wall surface of the pedestal accommodating portion 2e. The bus bar 12 is attached to the bolt block 32 in a state where the fastening portion 10a of the bolt 10 is inserted into the through hole 120aa of the connection portion 120a.

  Moreover, in the electrical junction box 1 having the above-described configuration, the upper surface opening 2b has an inner diameter of the circular hole that is the same as or smaller than the outer diameter of the cylindrical pedestal 102. As a result, when the pedestal portion 10b is accommodated in the pedestal accommodating portion 2e, the inner peripheral surface of the circular hole of the upper surface opening 2b is pressed against the outer peripheral surface of the cylindrical pedestal portion 102, and the bolt block 32 removes the bolt 10 more. It becomes easy to hold and it is possible to suppress the drop of the bolt 10 from the bolt block 32. Further, the upper surface opening 2b is provided with a pair of small protrusions at positions facing the direction orthogonal to the axial direction on the inner peripheral surface of the circular hole, so that the pair of small protrusions is the outer periphery of the cylindrical pedestal portion 102. By being pressed against the surface, the same effect as described above can be obtained. Further, the side opening 2d is provided with small protrusions so as to face a pair of opposing short sides, so that the pedestal portion 10b is locked by the small protrusions and suppresses the drop of the bolt 10 from the bolt block 32. Can do. Further, the pedestal accommodating portion 2e is provided with a pair of small protrusions on a pair of opposed inner wall surfaces among the plurality of inner wall surfaces, so that the pair of small protrusions are pressed against the outer peripheral surface of the rectangular pedestal portion 104, and Similar effects can be obtained. Further, the pedestal accommodating portion 2e is provided with at least two small protrusions extending from the side surface opening 2d in the depth direction with respect to the inner bottom surface at a predetermined interval, so that the small protrusions become the pedestal portion 10b. The same effect as described above can be obtained.

  According to the electrical junction box 1 having the above configuration, the bus bar 12 is provided so that the restricting portion 120 closes the entire side opening 2d. When the bolt 10 is about to start rotating together with the rotation of the hexagon nut 44 when the bus bar 12 is fastened, the pair of opposing surfaces 104a of the pedestal portion 10b with respect to the rotation about the axial direction of the bolt 10 , 104b, one facing surface 104a faces in the rotational direction and restricts the rotation of the pedestal portion 10b. Specifically, as shown in FIG. 7, when the bolt 10 tries to rotate together when the hexagon nut 44 is tightened, the facing surface 104a of the pedestal portion 10b rotates in the direction of the arrow about the axial direction. Although it tries, the movement which the base part 10b rotates will be restrict | limited by hitting the control part 120 currently fixed to the volt | bolt block 32. FIG. As a result, it is possible to easily prevent the bolt 10 from dropping off due to an external force generated when the hexagon nut 44 is fastened to the bolt 10.

  Further, according to the electrical junction box 1 having the above-described configuration, the bus bar 12 has the abutting portion 120b bent from the end portion of the connecting portion 120a toward the side opening 2d and abutting against the opposing surface 104a. The same effect can be obtained. Moreover, since the connection part 120a has the through-hole 120aa which the fastening part 10a of the volt | bolt 10 penetrates, the bus bar 12 can be attached to the bolt block 32 by inserting the fastening part 10a of the volt | bolt 10 into the through-hole 120aa, The detachment of the bolt 10 from the bolt block 32 can be easily and easily prevented.

  The bolt 10 only needs to be able to fasten a terminal connected to the power source side of the vehicle and a terminal connected to the load side of the vehicle, and may be a hexagonal nut, for example. Moreover, although the pedestal part 10b is press-fitted into the pedestal accommodating part 2e with respect to the bolt block 32 via the side opening part 2d, the bolt 10 is not limited to this. For example, the structure which provides a latching mechanism in the base housing | casing part 2e side, and latches the base part 10b may be sufficient.

  Further, the contact portion 120b is provided so as to close the entire side opening 2d, but may be formed so as to close a part of the side opening 2d. For example, if the opposing surface 104a of the pedestal portion 10b leaves a portion that contacts the contact portion 120b when rotated in the rotational direction when the hexagon nut 44 is fastened, it extends in the longitudinal direction of the contact portion 120b. The portion to be made may be half of the entire length.

  The bus bar 12 is used as a member that closes the side opening 2d of the bolt block 32, but is not limited thereto. In addition, the bus bar 12 is configured to be attached to the bolt block 32 from the upper side in the vertical direction, but is not limited thereto. For example, the bus bar 12 and the bolt 10 may be attached to the separated bolt block, and the bolt block may be attached to the frame 3 from the lower side in the vertical direction.

DESCRIPTION OF SYMBOLS 1 Electrical junction box 2 Case 2a Upper surface 2b Upper surface opening part 2c Side surface 2d Side surface opening part 2e Base accommodating part 3 Frame 10 Bolt 10a Fastening part 10b Pedestal part 12 Bus bar 30 Component mounting part 32 Bolt block 40 Terminal 42 Power line 44 Hexagon nut 102 Cylindrical pedestal part 104 Rectangular pedestal part 104a, 104b Opposing surface 120 Restricting part 120a Connection part 120aa Through hole 120b Abutting part

Claims (2)

A resin casing;
A fixing member that is attached to the housing and fastens a terminal connected to a power source side of the vehicle and a terminal connected to a load side of the vehicle;
A conductor fixed to the housing and having conductivity;
With
The fixing member is
A shaft-like fastening portion capable of fastening the terminal;
A pedestal having at least a pair of facing surfaces in a direction orthogonal to the axial direction at the axial end of the fastening portion,
The housing has an opening for accommodating the pedestal portion of the fixing member in an accommodating portion,
The conductor is
A restricting portion provided to close all or part of the opening,
The regulating portion is configured such that one of the opposed surfaces of the pedestal portion faces the rotational direction and the pedestal portion with respect to the rotation of the fixing member around the axial direction. Regulating the rotation of the
An electrical junction box characterized by that. The regulation part is
A flat connecting portion electrically connected to the fixing member and having a through hole through which the fastening portion of the fixing member passes;
Having an abutting portion that is bent from the end of the connecting portion toward the opening and abuts against one of the opposing surfaces;
The electrical junction box according to claim 1.

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