JP4606371B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box installed in a vehicle such as an automobile, and more particularly to an electrical junction box that connects a bus bar and a terminal of an electric wire terminal by fastening with bolts and nuts.

  The electrical junction box constitutes a desired circuit with electronic parts such as relays and fuses in the box and a bus bar, and the terminals of the wire terminals are connected to the bus bar to perform functions such as power distribution and signal relay. And what connects both with a bus bar and the terminal of an electric wire terminal with a volt | bolt and a nut is known (for example, refer patent document 1).

  In the electrical junction box disclosed in Patent Document 1, the bus bar and the terminal of the electric wire terminal are fastened with bolts and nuts, and both are connected. The nut is pre-molded in the nut receiving portion provided in the housing of the electrical junction box, and on the upper surface of the nut, the tip of the bus bar in which the bolt holes are respectively drilled and the terminal of the electric wire terminal are arranged, Bolts are screwed into the nuts through the bolt holes.

JP 2004-080874 A

  By the way, the housing of the electrical junction box is generally formed by injection molding of a synthetic resin. For example, a high-strength and high-hardness resin such as SPS (syndiotactic polystyrene) resin has been used in recent years. More inexpensive PP resin containing talc is also used.

  Here, in the configuration in which the nut is molded (press-fit) into the nut receiving portion of the housing as in Patent Document 1, the nut is held in the nut receiving portion by friction with the nut receiving portion. Is more flexible than SPS resin. Therefore, there is a concern that the holding force of the nut in the nut receiving part will be insufficient in a housing made of PP resin containing talc, and the nut will come out of the nut receiving part at the time of fastening. There was a possibility that the connection with the terminal of the terminal would be hindered.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an electrical connection box that fastens and connects a bus bar and a terminal of an electric wire terminal with nuts and bolts press-fitted into a nut receiving portion of a housing. An object of the present invention is to provide an electrical junction box that can improve the holding force of a nut and thereby reliably connect a bus bar and a terminal of an electric wire terminal.

In order to achieve the above object, the electrical connection box according to the present invention is such that the connection portion of the bus bar and the terminal of the electric wire end are superimposed on the upper surface of the nut press-fitted into the nut receiving portion of the housing, An electric connection box in which a bolt is screwed into the nut through a bolt hole provided in each of the terminals and the terminal and the bus bar are fastened. The bus bar extends from both side edges of the connection portion. The bus bar has a pair of hanging portions arranged so as to sandwich the nut receiving portion, and locking claws of the housing are respectively locked in locking holes formed in the hanging portions. Is fixed to the housing, and holds the upper surface of the nut at the connecting portion.

  According to the electrical junction box of the present invention, the bus bar is fixed to the housing, and the connecting portion disposed on the upper surface of the nut press-fitted into the nut receiving portion presses the upper surface of the nut, and the holding force of the bus bar by the housing Can be added to compensate for the shortage of the holding force of the nut in the nut receiving portion, and the nut can be prevented from coming off from the nut receiving portion. Thereby, a bus bar and the terminal of an electric wire terminal can be connected reliably. The bus bar is fixed to the housing by locking a pair of hanging portions extending from both side edges of the connecting portion, and according to this, the holding force of the bus bar by the housing is effectively and reliably secured. It can act on the connection and on the nut via the connection.

  Hereinafter, preferred embodiments of an electrical junction box according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of one embodiment of an electrical junction box according to the present invention, FIG. 2 is a perspective view of a principal part of the electrical junction box of FIG. 1, and FIG. 3 is a sectional view of a principal part of the electrical junction box of FIG.

  As shown in FIGS. 1 and 2, the electrical junction box 10 of the present embodiment is formed into a box shape by injection molding a relatively flexible synthetic resin such as PP resin containing talc, and an electronic device such as a relay inside. A housing 11 that houses parts and bus bars, and a separate cassette fuse block 12 that houses fuses and is assembled to the bottom of the housing 11 are provided.

  A power line connecting portion 13 is provided on the outer side surface of the housing 11 so as to protrude outward. A terminal of the power line W 1 is connected to one end of the bus bar 14 provided in the power line connecting portion 13. 15 is connected, and the other end of the bus bar 14 is connected to the terminal 16 of the relay wire W2 connected to the cassette fuse block 12, and the power line W1 and the relay wire W2 are electrically connected via the bus bar 14. Has been.

  The connection between the bus bar 14 and the terminal 15 of the power supply line W1 and the connection between the bus bar 14 and the terminal 16 of the relay wire W2 are both performed by fastening both with bolts B and nuts N. Hereinafter, the connection structure between the bus bar 14 and the terminal 15 of the power supply line W1 and the terminal 16 of the relay wire W2 by fastening will be described with reference to FIG. The connection structure between the bus bar 14 and the terminal 15 of the power line W1 and the connection structure between the bus bar 14 and the terminal 16 of the relay wire W2 are substantially the same. A connection structure with the terminal 15 will be described.

  As shown in FIG. 3, the power supply line connecting portion 13 of the housing 11 has a nut press-fit hole 21 opened upward and a bolt receiving hole 22 extending downward from the center of the bottom surface of the press-fit hole 21. A receiving part 20 is provided. A nut N is press-fitted into the press-fitting hole 21 in advance, and the upper surface of the nut N that is press-fitted and held by the nut receiving portion 20 slightly protrudes from the upper surface of the nut receiving portion 20.

  The bus bar 14 has a substantially rectangular plate-like connection portion 25 and a pair of hanging portions 26 extending downward from both side edges of the connection portion 25, and is formed in a U-shaped cross section as a whole. Yes. A gap A1 for accommodating one hanging portion 26 of the bus bar 14 is provided between the outer surface of the housing 11 and the nut receiving portion 20, and between the inner surface of the side wall of the power line connecting portion 13 and the nut receiving portion 20. Has a gap A2 for accommodating the other drooping portion 26 of the bus bar 14, and the bus bar 14 has a pair of drooping portions 26 inserted into the gaps A1 and A2, respectively, and the connecting portion 25 overlaps the upper surface of the nut N. Thus, it is attached to the power line connecting portion 13.

  The terminal 15 of the power line W1 is a kind of Y lug terminal provided with a slot 15b that communicates with a bolt hole 15a that is drilled in the center from one side edge, and is drilled in the connecting portion 25 of the bus bar 14. The bolt B is screwed into the gap between the head of the bolt B and the connecting portion 25 in a state where the bolt B is screwed into the nut N through the bolt hole 25a. The bolt B is tightened with the connecting portion 25 of the bus bar 14 and the terminal 15 of the power supply line W1 interposed between the nut N and the head of the bolt B, and the bus bar 14 and the terminal 15 of the power supply line W1 are fastened. Is done.

  Here, as the bolt B is tightened, a reaction force acts on the nut N, and the reaction force acts to pull the nut N out of the press-fit hole 21. In order to resist the reaction force, in the present embodiment, a gap A1 between the outer surface of the housing 11 and the nut receiver 20 and a gap A2 between the inner surface of the side wall of the power line connecting part 13 and the nut receiver 20 are provided. A pair of hanging portions 26 of the bus bar 14 that are respectively accommodated and disposed so as to sandwich the nut receiving portion 20 are locked to the housing 11, thereby fixing the bus bar 14 to the housing 11, and The nut N is held down.

  In the gap A1 between the outer side surface of the housing 11 and the nut receiving portion 20, an elastic locking piece 27 is disposed that connects the base end portion to the outer side surface of the housing 11 and extends downward. In addition, in the gap A2 between the inner wall of the side wall of the power line connecting portion 13 and the nut receiving portion 20, the base end portion is connected to the side surface of the nut receiving portion 20 and extends downward. An elastic locking piece 28 is provided.

  These elastic locking pieces 27 and 28 are inserted into the gap A1 between the outer surface of the housing 11 and the nut receiving portion 20 and the A2 between the inner surface of the side wall of the power line connecting portion 13 and the nut receiving portion 20, respectively. The latching claws 27a and 28a provided at the tip of the contact surface with the hanging part 26 are engaged with the locking holes 26a formed in the hanging part 26, respectively. The hanging portions 26 are locked together to restrict the set of hanging portions 26 from coming out of the gaps A1 and A2. As a result, the bus bar 14 is fixed to the housing 11, and the nut N is pressed against the connection portion 25. Note that the upper surface of the nut N slightly protrudes from the upper surface of the nut receiving portion 20, and if the pair of hanging portions 26 are locked so that both side edges of the connecting portion 25 are slightly displaced downward and bent, the connecting portion 25 is provided. It is preferable that the elastic restoring force can be added to the holding of the nut N.

  As described above, according to the electrical connection box 10 of the present embodiment, the bus bar 14 is fixed to the housing 11, and the connection portion 25 disposed on the upper surface of the nut N press-fitted into the nut receiving portion 20 has the nut N The holding force of the bus bar 14 by the housing 11 is added to compensate for the shortage of the holding force of the nut N in the nut receiving portion 20, and the nut N can be prevented from coming off from the nut receiving portion 20. Thereby, the bus bar 14 and the electric wire terminal can be reliably connected. The bus bar 14 is fixed to the housing 11 by locking a pair of hanging portions 26 extending from both side edges of the connecting portion 25. According to this, the holding force of the bus bar 14 by the housing 11 is secured. Can be effectively and reliably applied to the connecting portion 25 and to the nut N via the connecting portion 25.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

It is a perspective view of one embodiment of an electric junction box concerning the present invention. It is a principal part perspective view of the electrical-connection box of FIG. It is principal part sectional drawing of the electrical-connection box of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrical connection box 11 Housing 14 Bus bar 15 Terminal 20 Nut receiving part 25 Connection part 26 Hanging part B Bolt N Nut

Claims (1)

The bus bar connection part and the terminal of the electric wire end are overlapped on the upper surface of the nut press-fitted into the nut receiving part of the housing, and the bolt is screwed into the nut through the bolt hole respectively provided in the terminal and the connection part of the bus bar. An electrical junction box to which the terminal and the bus bar are fastened,
The bus bar has a set of hanging portions that are extended from both side edges of the connecting portion and are arranged so as to sandwich the nut receiving portion, and in the locking holes formed in each of the hanging portions, An electrical connection box , wherein the locking claws of the housing are respectively locked, the bus bar is fixed to the housing, and the upper surface of the nut is pressed at the connection portion.

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