JP4462124B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box. Specifically, a connector for connecting with an internal circuit material of a case body is temporarily placed inside the lower cover and fixed to the lower surface of the case body by bolting from the case body side. is there.

  Conventionally, in an electrical junction box mounted on an automobile, the circuit material housed in the case and the multipolar connector connected to the wire terminal are attached by bolting using an impact wrench to reduce the operating force during connector connection work. There is something to plan.

  As this type of electrical junction box, Japanese Patent Laid-Open No. 8-148224 (Patent Document 1) provides an electrical junction box 1 shown in FIG. The electrical connection box 1 is formed by passing bolts B through through holes 2a, 3a and 4a provided in the upper case 2, the lower case 3 and the multipolar connector 4, respectively, and fastening the connector 4 with a nut embedded in the connector 4. It is fixed in the connector housing 3b on the lower surface of the lower case 3.

  However, in the electrical connection box 1 provided in Patent Document 1, the connector 4 cannot be temporarily held in the connector housing portion 3b until the connector 4 is bolted to the case. The connector 4 must be bolted while an operator holds the connector 4 by hand, and the connector 4 is liable to be misaligned, which complicates the bolting operation and lowers the work efficiency.

JP-A-8-148224

The present invention has been made in view of the above problems, and temporarily holds the connector in the lower cover so that the bolt and the nut can be fastened without displacement even if the operator does not hold the connector by hand when fastening the bolt. In addition, a configuration in which the connector is pressed and held on the lower cover side even after the connector is fixed to the case body by bolting, and the connection reliability of the connector is improved.
Another object is to add a mechanism for guiding the connector when the connector is bolted so that the terminal on the case body side can be accurately inserted into the terminal accommodating chamber of the connector.

In order to solve the above problems, the present invention provides a lower cover in which a connector is temporarily placed inside a case main body of an electrical junction box in which circuit materials are accommodated, and a nut fixed to the connector. In the electrical junction box, the bolt is penetrated from above the case body and screwed to fix the connector to the lower surface of the case body .
Slide pieces projecting downward from the outer surfaces of at least two opposing sides of the rectangular housing of the connector are provided, and press-contact claws projecting outward from the lower end of the slide piece, and locked to the lower portion of the housing A portion of the peripheral wall of the connector cover that faces the slide piece is open, while the slide piece flexes freely ,
A holding and guide frame portion is formed by projecting from the inner surface of the side wall of the lower cover, a horizontal frame portion protruding toward the connector, and a vertical frame hanging from the front end along the outer wall of the connector housing. The vertical frame of the part is a taper part whose inner surface is notched in an inclined manner from the middle part in the height direction toward the lower end, and the pressure claw provided on the slide piece is pressed against the inner surface of the taper part of the vertical frame to The connector is temporarily held before fastening,
When the connector is tightened with the bolt, the slide piece is bent inward while the pressure contact claw is raised by sliding against the inner surface of the taper portion, and at the bolt fastening completion position, the pressure contact claw is moved to the maximum thick wall portion at the upper end of the taper portion. An electrical junction box is provided that is kept pressed and held.

According to the above configuration, until the connector is bolted, the outer end of the pressing claw at the lower end of the slide piece provided at a position facing the connector housing itself is pressed against the inner surface of the vertical frame portion of the holding / guide portion provided on the lower cover. Is held in a state where Therefore, the connector can be temporarily held at a predetermined position in the lower cover before the connector is bolted to the case body.
When the connector is bolted to the case body, since the connector is positioned at a predetermined position, the bolt can be surely passed through a nut embedded in the connector to facilitate the bolting operation.
Furthermore, even if the connector temporarily placed in the lower cover is moved in the pulling direction when the pressure contact claw is released from the holding and guiding frame against the vertical frame due to impact or vibration, the vertical frame remains in the height direction. As the taper part with the inner surface notched upward from the middle part to the lower end, the thickness of the connector increases as the connector moves in the pull-out direction, increasing the pressure contact force, and the vertical frame part while the slide piece bends inward It is possible to prevent the connector from falling off the lower cover by being held in pressure contact therewith.

Also, when tightening the bolt, the tip of the outer surface of the pressure claw slides into contact with the inner surface of the taper, and the connector rises straight up without tilting. Therefore, the bolt is not inserted obliquely with respect to the connector nut. The terminal on the case body side can be accurately inserted into the terminal accommodating chamber, and deformation of the terminal can be prevented.
Further, at the bolt fastening completion position, the press contact claw is pressed and held by the maximum thick portion at the upper end of the tapered portion. At that time, the connector is in a stable state even when subjected to vibrations or impacts, with the center part fixed by bolts and the pressure claws pressed against the thickest part at the upper end of the taper part at the outer peripheral position. Can hold the connector. Furthermore, even if the fastening of the bolt may be loosened, it can be held at the bolt normal position by holding the taper part and the pressure contact claw, and the connection reliability of the connector can be improved.

  From the viewpoint of raising the pressure contact claw provided at the lower end of the slide piece while slidingly contacting the taper portion of the vertical frame at the time of bolt fastening, it is preferable that the contact surface is a flat surface in surface contact and the overall shape is a trapezoidal cross section. .

As described above, the connector cover at the bottom of the connector is coupled, the slide piece facing the portions of the peripheral wall of the connector cover is in freely bending of the slide piece as an opening.

  According to the above configuration, the slide piece freely bends regardless of the vertical position, so that the press contact claw of the slide piece can be bent inward to the bolt fastening completion position, and the connector is pressed against the inner surface of the taper portion. Can be firmly fixed.

  It is preferable that a plurality of the connectors are accommodated in the lower cover, and the holding and guide frame portion is provided at a position facing the slide piece of each connector.

  As described above, according to the present invention, until the connector is bolted, the outer surface tip of the pressure contact claw provided on the slide piece protruding from the connector housing (connector body) is in contact with the inner surface of the tapered portion provided on the lower cover. Since the connector is pressed, the connector can be held in a predetermined position inside the lower cover. In addition, even if the connector temporarily placed in the lower cover moves in the direction of removal from the lower cover due to impact or vibration, the connector may fall off the lower cover due to the slide piece being bent inward and held in pressure contact with the tapered portion. Can be prevented.

Further, when the connector is bolted to the case body, the connector is positioned at a predetermined position of the lower cover, so that the bolt can be surely passed through a nut fixed to the connector to facilitate the bolting operation. .
Furthermore, when the bolt is tightened, the tip of the outer surface of the press-contact claw is in sliding contact with the inner surface of the taper, and the connector rises straight up without tilting, so that the bolt is not inserted obliquely with respect to the connector nut. Can be fixed to the case body at a predetermined angle. Therefore, the connection reliability of the connector can be improved without causing deformation or damage to the terminal on the main body case side inserted into the terminal receiving hole of the connector.
Furthermore, even after the connector is bolted to the case body, the pressure contact claw of the connector is held in pressure contact with the tapered portion of the lower cover, so that the connector can be more securely fixed to the body case.

  Further, when the connector cover is coupled to the lower portion of the connector, a portion of the peripheral wall of the connector cover that faces the slide piece is made an opening so that the slide piece can be freely bent. This allows the slide piece to bend freely regardless of the vertical position, so that the press-contact claw of the slide piece can bend inward to the bolt fastening completion position, and slidably contact the inner surface of the taper part to secure the connector. can do.

Embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention.
As shown in FIG. 1, an electrical junction box 10 includes a case body 11 having an internal circuit, three multipolar connectors 30 fastened and fixed to the lower surface of the case body 11 with bolts 20, and the multipolar connector 30. A lower cover 18 that is temporarily placed and an upper cover 17 that covers the upper portion of the case body 11 are configured.

As shown in FIG. 2, the case body 11 includes an upper case 12 and a lower case 13, and a bus bar (circuit material) 14 formed by punching a conductive metal plate into the case body 11 into a required shape. The laminated body 16 which laminated | stacked the insulating board 15 alternately is accommodated.
The lower case 13 is provided with connector housing portions 13a by projecting square frame portions 13b projecting downward at three locations.
A bolt insertion cylinder 13c that protrudes toward the case main body is protruded from the central portion on the upper surface side of the connector housing portion 13a and communicates with a bolt hole 12a provided in the upper case 12.
The bolt 20 is passed through the bolt hole 12a and the bolt insertion cylinder 13c communicated from above, and the lower side of the bolt 20 protrudes into the connector housing portion 13a.

  Further, the front end of the bus bar 14 is bent downward to provide a tab (not shown), and the tab is projected into the connector housing portion 13a through the terminal hole 13d provided in the lower case 13. A tab (not shown) formed by bending upward on the bus bar 14 is connected to a fuse accommodating part 12b of the upper case 12 or a fuse accommodated in the relay accommodating part 12c, or a terminal of a relay (not shown). .

  The connector 30 has a connector cover 32 locked to a lower portion of a connector housing 31 (hereinafter referred to as a connector main body) provided with a multipolar terminal accommodating chamber. When the connector 30 is bolted to the case body in the terminal housing chamber, a tab standing from the bus bar 14 in the case body 11 is inserted, and the terminal of the wire terminal inserted and locked in the terminal housing chamber Mating and connecting.

  A bolt insertion part 31a penetrating vertically is provided at the approximate center of the connector main body 31, and a nut 33 is embedded below the bolt insertion part 31a. An electric wire outlet 32a is provided on the side wall of the connector cover 32, and an electric wire (not shown) connected to the connector 30 is drawn out through the electric wire outlet 32a.

  As shown in FIG. 4, the connector main body 31 has a quadrangular shape and is provided with slide pieces 31c projecting downward from at least two opposing outer surfaces, and press-contact claws 31d projecting outwardly at the lower ends of the slide pieces 31c. ing. The pressure contact claw 31d has a generally trapezoidal cross section, and the upper surfaces 31d-1 and 31d-2 are inclined surfaces, while the outer surface tip protruding in a V shape is a flat surface 31d-3.

  As shown in FIGS. 4 and 3, the lower cover 18 protrudes from the inner surface of the side wall 18a toward the connector 31 and the horizontal frame portion 18b projects from the front end along the outer wall of the connector housing. A guide frame is also provided. The vertical frame 18c of the holding / guide frame has a tapered portion 18d having an inner surface cut out in an inclined manner from the intermediate portion in the height direction toward the lower end. Further, a positioning frame 18e is provided from the bottom wall between the adjacent vertical frames 18c, and a plurality of connectors 30 can be arranged at predetermined positions by the positioning frame 18e. In the present embodiment, three connectors 30 can be arranged in the lower cover 18.

Next, assembly of the electrical junction box having the above structure will be described.
Before the case main body 11 is bolted, the connector 30 is accommodated in the lower cover 18 in a temporarily placed state, as shown in FIGS.
At that time, each connector 30 bends the pressure contact claw 31d of the slide piece 31 inward, and pushes the pressure contact claw 31d to the taper portion 18d. In this state, while being partially surrounded by the positioning frame 18e, the outer surface tip 31d-3 of the pressure contact claw 31d is pressed against the tapered portion 18d, and is pressed to temporarily hold the connector 30. Thus, the connector 30 is temporarily held at the normal position. Therefore, even when an impact or vibration is applied and the connector 30 moves in the direction in which the upper end opening of the lower cover 18 is pulled out, the pressure contact force on the taper portion 18d of the pressure contact claw 31d increases and is held stronger. 30 is prevented from falling off.

  In this state, when the lower cover 18 is disposed at a normal position on the lower surface side of the lower case 13 of the case main body 11, the bolt 20 penetrating the case main body 11 and the bolt insertion portion 30 a of the connector 30 in the lower cover 18 are disposed to face each other. The

Next, when the bolt 20 is bolted using an impact wrench (not shown), the bolt 20 is screwed into the nut 33 in the connector main body 31, and the outer surface tip 31d-3 of the press-contact claw 31d is in sliding contact with the tapered portion 18d. However, the connector 30 rises.
At the bolt fastening completion position, as shown in FIG. 4B, the outer surface tip 31d-3 of the press-contact claw 31d is strongly pressed and held on the thickest portion of the tapered portion 18d.

  When the connector 30 is inserted to the normal position of the connector housing portion 13a of the case body 11, the tab of the bus bar 14 protruding into the connector housing portion 13a is inserted into the terminal housing chamber through the terminal hole of the connector 30, and the female terminal Connected to terminal.

According to the above configuration, until the connector 30 is bolted to the case body 11, the outer surface tip 31 d-3 of the press contact claw 31 d provided on the two opposing slide pieces 31 c of the connector body 31 is tapered on the lower cover 18. The connector 30 is pressed against the inner surface of the portion 18d and is pressed and temporarily held, so that the connector 30 is not displaced in the horizontal direction until the bolt is tightened. Therefore, when the connector 30 is bolted to the case body 11, the connector 30 can be positioned at a normal position, and the bolt 20 can be surely passed through the nut 33 fixed to the connector 30 to facilitate the bolting operation. it can.
In addition, before the bolts are tightened, impact or vibration is applied to the connector 30 temporarily placed in the lower cover 18 and the outer end 31d-3 of the pressure contact claw 31d gradually increases in thickness when the connector 30 moves in the pulling direction with respect to the lower cover 18. Then, the taper portion 18d is more pressed and difficult to come out, and the connector 30 can be prevented from falling off the lower cover 18.

At the time of fastening the bolt, the outer surface tip 31d-3 of the pressure contact claw 31d is in sliding contact with the inner surface of the taper portion 18d, the slide pieces are opposed to each other, and the taper portions 18d are opposed to these ride pieces. The connector 30 can be fixed to the case body 11 at a predetermined angle without the bolt 20 being inserted obliquely with respect to the nut 33 of the connector 30. Therefore, the terminal of the bus bar on the case body side can be accurately inserted into the terminal accommodating chamber of the connector body 31.
Further, at the bolt fastening completion position, the outer surface tip 31d-3 of the pressure contact claw 31d of the slide piece 31c is strongly pressed and held on the thickest surface of the tapered portion 18d. In this state, the play of the connector 30 can be prevented, and even if the bolt is loosened, the connector 30 can be held on the lower surface of the case body, and the connection reliability of the connector can be improved.

  A portion of the peripheral wall of the connector cover 32 facing the slide piece 31c is an opening. Therefore, the slide piece 31c can be flexed freely regardless of the vertical position, and the press-contact claw 31d of the slide piece 31c can be greatly bent inward even at the bolt fastening completion position. Can be pressed and fixed.

It is a disassembled perspective view of the electrical junction box of the embodiment of the present invention. It is sectional drawing of the electrical connection box of an assembly | attachment state. It is a top view which shows the state which accommodated the connector in the lower cover. (A) (B) is a figure which shows the process of bolting and fixing a connector to a case main body, (C) is an enlarged view which shows the press-contacting nail | claw of the lower end of a slide piece, and the taper part of a vertical frame. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrical junction box 11 Case main body 12 Upper case 13 Lower case 13a Connector accommodating part 14 Bus bar 15 Insulation board 18 Lower cover 18c Vertical frame 18d Tapered part 20 Bolt 30 Connector 31 Connector housing (connector main body)
31c Slide piece 31d Pressure claw 32 Connector cover 33 Nut

Claims (2)

A lower cover having a connector temporarily placed therein is disposed below the case body of the electrical junction box in which the circuit material is accommodated, and a bolt is penetrated from above the case body with respect to a nut fixed to the connector. In the electrical junction box that is screwed to fix the connector to the lower surface of the case body ,
Slide pieces projecting downward from the outer surfaces of at least two opposing sides of the rectangular housing of the connector are provided, and press-contact claws projecting outward from the lower end of the slide piece, and locked to the lower portion of the housing A portion of the peripheral wall of the connector cover that faces the slide piece is open, while the slide piece flexes freely ,
A holding and guide frame portion is formed by projecting from the inner surface of the side wall of the lower cover, a horizontal frame portion protruding toward the connector, and a vertical frame hanging from the front end along the outer wall of the connector housing. The vertical frame of the part is a taper part whose inner surface is notched in an inclined manner from the middle part in the height direction toward the lower end, and the pressure claw provided on the slide piece is pressed against the inner surface of the taper part of the vertical frame to The connector is temporarily held before fastening,
When the connector is tightened with the bolt, the slide piece is bent inward while the pressure contact claw is raised by sliding against the inner surface of the taper portion, and at the bolt fastening completion position, the pressure contact claw is moved to the maximum thick wall portion at the upper end of the taper portion. An electrical junction box characterized by being kept pressed and held. The electrical junction box according to claim 1, wherein a plurality of the connectors are accommodated inside the lower cover, and the holding and guide frame portion is provided at a position facing the slide piece of each connector .

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