JP4363353B2 - 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, the electrical connection box 1 provided in Patent Document 1 does not have a structure in which the connector 4 can be temporarily locked to the connector housing 3b until the connector 4 is bolted to the case. There is a problem in that the worker must hold the accommodated connector 4 by hand while tightening the bolt, and the connector 4 is easily displaced and the bolting operation becomes complicated and the working efficiency is deteriorated.

  On the other hand, in the electrical junction box provided in US Pat. No. 6,077,102 (Patent Document 2), a connector that is attached to the lower part of the main body case (connector housing) of the connector to protect the electric wire connected to the connector housing. A lock part is provided on the cover, and the lock part is temporarily locked to the lower cover side. When the connector is bolted to the case main body side, the lock with the lower cover side is released.

However, it is not preferable to provide a lock mechanism on the connector cover that is attached to the lower part of the connector housing and protects the electric wires because the strength of the connector cover is lower than that of the connector housing.
In addition, after the connector is tightened and fixed to the case body with bolts, the lock on the lower cover side is released, but the terminal housed in the case body is inserted and locked in the terminal housing chamber of the connector. Therefore, assuming that the bolts are loosened or the bolts are loosened due to external shock vibration after a lapse of time, the connector and the lower cover can be unlocked. This is not preferable in terms of connection reliability of the connector.

JP-A-8-148224 US Pat. No. 6,077,102

The present invention has been made in view of the above problems, and has a configuration in which a lock mechanism is provided in the connector cover and a mechanism for temporarily holding the connector cover in the lower cover is eliminated, and the connector is temporarily held in the lower cover until the connector is bolted to the case body. In addition, the connector is configured to be locked to the lower cover side even after the connector is fixed to the case main body by bolting, and it is an object to improve the connection reliability of the connector.
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 bolted to fix the connector to the lower surface of the case body, and the terminal of the circuit material is inserted into the terminal accommodating chamber of the connector.
A holding claw that protrudes outward is provided at each of the lower portions of the outer surfaces of at least two opposing sides of the rectangular housing of the connector, and
A connector cover is lock-coupled to the lower portion of the connector housing, and a concave portion is provided from a lower peripheral wall to a bottom wall of the connector cover,
A guide piece protrudes from the bottom surface of the bottom wall adjacent to the side wall of the lower cover substantially perpendicularly to the position facing the holding claw, and the upper end of the guide piece faces the holding claw at the bolt fastening completion position of the connector. Projecting to a position, and projecting inwardly a locking claw at its upper end, and provided with a reinforcing rib connected to the side wall at an intermediate position in the height direction of the guide piece, and
A positioning piece that fits into the recess from the bottom wall of the lower cover,
Before the connector is bolted, the outer surface of the holding claw is pressed against the guide piece, and the positioning piece is fitted into the concave portion of the connector cover so that the connector is temporarily held in the lower cover. And
The connector is lifted while the outer surface of the holding claw is slidably contacting the guide piece when the bolt is fastened, and the upper surface of the holding claw is locked to the lower surface of the locking claw of the guide piece at the bolt fastening completion position. Offering a box.

According to the above configuration, until the connector is bolted, the outer surface of the holding claw provided at least on the connector housing itself is held in a state of being pressed against the inner surface of the guide piece provided on the lower cover. Therefore, the connector can be temporarily held in the normal position in the lower cover before the connector is bolted to the case body.
When the connector is bolted to the case main body, the connector is positioned at a normal position, and 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 holding claw is released from the impact due to impact or vibration, the holding claw is locked to the locking claw at the upper end of the guide piece. This prevents the connector from falling off the lower cover.

Also, when tightening the bolt, the outer surface of the holding claw slides against the inner surface of the guide piece and the connector rises straight up without tilting. Therefore, the bolt of the connector is not inserted diagonally with respect to the connector nut. The terminal on the case body side can be accurately inserted into the housing chamber, and deformation of the terminal can be prevented.
Furthermore, in the bolt fastening completion position, the upper surface of the holding claw is held in a locked state on the lower surface of the locking claw of the guide piece. At that time, the connector is fixed in a stable state even when a vibration or impact is applied by fixing the holding claw to the locking claw of the guide piece at the outer peripheral position by fixing the center part with a bolt. Can be held. Furthermore, even if the fastening of the bolt may be loosened, the locking claw and the holding claw can be used to hold the bolt in the normal position, and the connection reliability of the connector can be improved.

From the viewpoint of raising the holding claw while sliding on the guide piece when the bolt is fastened, it is preferable that the contact surface is a circular arc surface that makes point contact and the overall shape is a triangular cross section.
On the other hand, from the viewpoint of enhancing the temporary holding function before fastening the bolt, the contact surface may be a vertical surface and may be in surface contact with the guide piece.

The upper surface of the holding claw is wide and the lapping margin with the locking claw is large.
With this configuration, it is possible to improve the holding force by the locking claws after the bolt is tightened, and it is possible to improve the retaining function when the connector is temporarily placed in the lower cover before the bolt is tightened. .

As described above, the connector cover at the bottom of the connector housing is locked coupling, while providing the recess toward the bottom wall from the peripheral wall lower portion of the connector cover, projecting positioning piece fitted into the bottom wall of the lower cover into the recess And
Before the connector is bolted, the positioning piece is fitted in the recess of the connector cover, and the connector is temporarily held in a state of being positioned on the lower cover .

If the connector cover is attached to the connector housing as described above, the group of wires connected to the connector housing can be accommodated inside the lower cover without being disassembled, and can be accommodated inside the lower cover. When tightening, each connector can be smoothly fastened to the case body without tangling with the wire group of the adjacent connector.
And while providing a recessed part from the surrounding wall lower part of the connector cover to the bottom wall, a positioning piece that fits into the recessed part protrudes from the bottom wall of the lower cover, and the positioning piece is fitted in the recessed part of the connector cover. The connector can be held at a regular temporary holding position.

The temporary holding leg protrudes downward from the lower end of the four corners of the connector housing, and a temporary holding claw is provided at the lower end of the temporary holding leg,
A claw portion for temporarily holding the temporary holding claw is provided on the bottom wall of the lower cover,
Even when the temporary holding claw is temporarily held by the claw portion of the lower cover before the connector is bolted, the same effect as that of the present invention can be generated.

That is, instead of attaching the connector cover to the connector housing, temporary holding legs protrude from the connector housing, and a group of wires connected to the connector housing is accommodated in a space surrounded by the temporary holding legs.
If a temporary holding claw is provided at the lower end of the temporary holding leg and a claw portion for temporarily holding the temporary holding claw is provided on the bottom wall of the lower cover, the connector can be temporarily held in the lower cover during temporary placement. The temporary holding claw and the claw portion of the lower cover are locked in such a manner that the locking is easily released when the connector is raised by bolting.

A plurality of the connectors are accommodated inside the lower cover, and the guide pieces are provided at positions facing the holding claws of each connector.
According to the above configuration, even when there are a plurality of connectors to be bolted and fixed to the case body, the connectors can be temporarily placed at a predetermined position of the lower cover and the holding claws can be pressed against the guide pieces and positioned. Therefore, if you place the case body on the connector temporarily placed in the lower cover and tighten each bolt, each connector can be bolted and fixed to a predetermined place on the case body without positioning. it can.

Further, since the guide piece erected from the bottom wall of the lower cover has a large protruding amount, it is preferable to provide a reinforcing rib for connecting the side wall of the lower cover at an intermediate position in the height direction.
With this structure, the reinforcing ribs make it difficult for the guide piece to be bent outward, that is, toward the side wall of the lower cover. Therefore, even if the holding claw of the connector is pressed against the guide piece, the connector is not bent or bent, and the connector can be temporarily locked at a predetermined position without being displaced in the horizontal direction.
Further, even after the completion of the bolt fastening, it is possible to prevent the guide piece from being bent outward and the engagement with the holding claw with the locking claw being released.

As described above, according to the present invention, the outer surface of the holding claw protruding from the connector housing (connector body) is pressed against the inner surface of the guide piece provided on the lower cover until the connector is bolted. Can be held in a normal position inside the lower cover.
When the connector is bolted to the case main body, since the connector is positioned at the normal position of the lower cover, the bolt can be surely passed through the nut embedded in the connector to facilitate the bolting operation.
Also, 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 holding claw is locked by the locking claw provided at the upper end of the guide piece of the lower cover, so the connector is Can be prevented from falling off.

Furthermore, when the bolt is tightened, the outer surface of the holding claw is in sliding contact with the inner surface of the guide piece, and the connector rises straight up without tilting, so that 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. 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 accommodating chamber of the connector.
Furthermore, even after the connector is bolted to the case body, the connector's holding claw is held in a locked state with the locking claw of the guide piece of the lower cover, so the connector is more securely fixed to the body case. Can do.

In addition, before the bolt fastening, not only the temporary locking by the holding claw protruding from the connector as described above and the guide piece provided on the lower cover, but also the positioning provided on the bottom wall of the lower cover and the lower cover of the connector cover The temporary locking of the connector can be made more reliable by fitting with the piece.

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-like terminal (not shown), and the terminal is protruded into the connector housing portion 13 a through a terminal hole 13 d provided in the lower case 13. A tab-like terminal (not shown) formed by bending upward on the bus bar 14 is connected to a fuse and a relay (not shown) terminal accommodated in the fuse accommodating part 12b and the relay accommodating part 12c of the upper case 12. It is configured.

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 main body in the terminal accommodating chamber, a terminal standing from the bus bar 14 in the case main body 11 is inserted, and the terminal of the wire terminal inserted and locked in the terminal accommodating 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 peripheral wall 32b 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 holding claws 31d project outwardly from the lower portions of the outer surfaces of the two opposing sides. The holding claw 31d has a substantially triangular cross section, and the upper surface 31d-1 and the lower surface 31d-2 are inclined surfaces, while the outer surface tip protruding in a V shape is an arc surface 31d-3. The upper surface 31d-1 of the holding claw 31d is wide so that a lapping margin with a locking claw 18d of the lower cover 18 described later is large. The outer surface tip may be a vertical plane.
The box-shaped connector cover 32 that is locked to the lower part of the connector body 31 is provided with a recess 32d from the lower part of the peripheral wall 32b to the bottom wall 32c.

As shown in FIGS. 4 and 3, the lower cover 18 is provided with a guide piece 18c protruding upward from a bottom wall 18b adjacent to the side wall 18a at a position facing the holding claw 31d. The guide piece 18c protrudes to a position facing the holding claw 18d at the bolt fastening completion position of the connector 30 shown in FIG. 4B, and a locking claw 18d protrudes inward at the upper end thereof. The locking claw 18d has an upper surface 18d-1 as an inclined surface, and a lower surface 18d-2 as a horizontal surface.
The guide piece 18c connects the outer surface of the intermediate position in the height direction and the side wall 18a of the lower cover 18 with a reinforcing rib 18e. Further, a positioning frame 18f is provided from the bottom wall between the lower ends of the adjacent guide pieces 18d so that the plurality of connectors 30 can be arranged at predetermined positions by the positioning frame 18f. In the present embodiment, three connectors 30 can be arranged in the lower cover 18.
Further, in the space surrounded by the positioning frame 18f, a positioning piece 18g that fits into the recess 32d from the bottom wall 18b of the lower cover 18 is provided at a position facing the recess 32d provided in the connector cover 32 of the connector 30 to be positioned. It is protruding.

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 is pushed to the bottom wall side with the holding claw 31d getting over the locking claw 18d at the upper end of the guide piece 18c of the lower cover 18. In this state, it is partially surrounded by the positioning frame 18f, the outer surface 31d-3 of the holding claw 31d is pressed against the guide piece 18c, and is pressed into contact with the recess 32d of the connector cover 32. The positioning piece 18d is fitted inside, and the connector 30 is temporarily held. 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 pulling direction on the upper end opening side of the lower cover 18, the upper surface 31d-1 of the holding claw 31d and the lower surface 18d-2 of the locking claw 18d of the guide piece contact each other. The connector 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 body 31, and the outer surface 31d-3 of the holding claw 31d is in sliding contact with the guide piece 18c. The connector 30 is raised.
At the bolt fastening completion position, as shown in FIG. 4B, the upper surface 31d-1 of the holding claw 31d is locked to the lower surface 18d-2 of the locking claw 18d of the guide piece 18c, while the concave portion of the connector cover 32 The positioning piece 18g of the lower cover 18 is pulled out from 32d, and the fitting on the lower side of the connector is released.

  When the connector 30 is inserted to the normal position of the connector housing portion 13a of the case body 11, the terminal 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 31 d-3 of the holding claw 31 d provided on the connector body 31 is pressed against the inner surface of the guide piece 18 c provided on the lower cover 18. While being pressed, the positioning piece 18d of the lower cover 18 is temporarily fitted in the concave portion 32d of the connector cover 32, 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.
Before the bolts are tightened, if an impact or vibration is applied to the connector 30 temporarily placed in the lower cover 18 and moves in the pulling direction with respect to the lower cover 18, the upper surface 31d- 1 and the lower surface 18d-2 of the locking claw 18d are locked, and the connector 30 can be prevented from falling off the lower cover 18.

Further, when the bolt is fastened, the outer surface 31d-3 of the holding claw 31d is slidably contacted with the inner surface of the guide piece 18c, and the connector 30 is lifted directly upward without being inclined, so that the bolt 20 is inclined with respect to the nut 33 of the connector 30. The connector 30 can be fixed to the case body 11 at a predetermined angle without being inserted into the case body 11. 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.
Furthermore, in the bolt fastening completion position, since the upper surface 31d-1 of the holding claw 31d is locked to the lower surface 18d-2 of the locking claw 18d of the guide piece 18c, the connector 30 is bolted and fixed to the case body 11. The backlash 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.

5 and 6 show a reference embodiment of the present invention.
In this reference embodiment, no connector cover is attached to the connector housing 31 ′ of the multipolar connector 30 ′, and the temporary holding legs 31e ′ having the same length are projected downward from the lower ends of the four corners of the connector housing 31 ′. Yes. A temporary holding claw 31f 'is provided on the outer surface of the lower end of the temporary holding leg 31e', and the upper surface 31f-1 'of the temporary holding claw 31f' has an arc shape in a vertical section.

On the other hand, on the bottom wall 18b of the lower cover 18, a protruding claw portion 18h is projected from a position corresponding to the temporary holding claw 31f 'of the connector housing 31'. On the inner surface side of the claw portion 18h, a concave portion 18h-1 for temporarily holding the temporary holding claw 31f ′ is provided, and the vertical cross section of the concave portion 18h-1 is also arcuate. Note that the upper surface 31f-1 ′ of the temporary holding claw 31f ′ and the recess 18h-1 of the claw portion 18h are not limited to the arc shape but may be tapered.
In addition, since the locking structure of the holding claw of the connector and the locking claw of the guide piece provided on the lower cover is the same as that of the first embodiment, the same reference numerals are given and the description is omitted.

Next, assembly of the electrical junction box having the above structure will be described.
If the connector 30 ′ is temporarily placed at a required position in the lower cover 18 before being bolted to the case body 11, the connector 30 ′ is held at a required height by the temporary holding leg 31 e ′. At this time, the outer surface 31d-3 ′ of the holding claw 31d ′ is pressed against the guide piece 18c and is in pressure contact, and the temporary holding claw 31f ′ of the temporary holding leg 31e ′ protruding from the connector housing 31 ′. Is temporarily latched in the recess 18h-1 of the claw 18h of the lower cover 18, and the connector 30 'is temporarily held.

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 body 11 and the bolt 20 is bolted using an impact wrench (not shown), the bolt 20 is turned into a nut in the connector housing 31 ′. 33, the temporary holding claw 31f 'and the claw portion 18h are temporarily locked, and the connector 30' is raised while the outer surface 31d-3 'of the holding claw 31d' is in sliding contact with the guide piece 18c.
At the bolt fastening completion position, as shown in FIG. 6B, the upper surface 31d-1 ′ of the holding claw 31d ′ is locked to the lower surface 18d-2 of the locking claw 18d of the guide piece 18c.
When the connector 30 ′ is inserted to the normal position of the connector housing portion 13 a of the case body 11, the terminal of the bus bar 14 protruding into the connector housing portion 13 a is inserted into the terminal housing chamber through the terminal hole of the connector 30 ′. Connected to the female terminal.

According to the above configuration, the outer surface 31d-3 ′ of the holding claw 31d ′ provided on the connector housing 31 ′ is pushed against the inner surface of the guide piece 18c provided on the lower cover 18 until the connector 30 is bolted to the case body 11. The temporary holding claw 31f ′ of the temporary holding leg 31e ′ projecting from the connector housing 31 ′ is temporarily held by the claw portion 18h of the lower cover 18 and is thus in contact with the connector 30 ′ before being bolted. Does not shift in the horizontal direction.
Therefore, as in the above-described embodiment, when the connector 30 ′ is bolted to the case body 11, the connector 30 ′ can be positioned in a normal position, and the bolt 20 is securely passed through the nut 33 fixed to the connector 30 ′. The bolting operation can be facilitated.

It is an exploded perspective view of the electrical connection box of implementation of the 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 drawing which shows the process of bolting and fixing a connector to a case main body, (C) is an enlarged view which shows a temporary holding nail | claw. It is a perspective view of the connector of a reference embodiment. (A) and (B) of the reference embodiment are drawings showing a process of bolting and fixing a connector to a case body, and (C) is an enlarged view showing a state where a temporary holding claw is temporarily held by a claw portion. 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 Guide piece 18d Locking claw 18e Reinforcement rib 18g Positioning piece 18h Claw part 20 Bolt 30 Connector 31 Connector housing (Connector main body )
31d Holding claw 31e 'Temporary holding leg 31f' Temporary holding claw 32 Connector cover 32d Recess 33 Nuts

Claims (3)

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 in which the terminal of the circuit material is inserted into the terminal accommodating chamber of the connector by fixing the connector to the lower surface of the case body by tightening the bolt,
A holding claw that protrudes outward is provided at each of the lower portions of the outer surfaces of at least two opposing sides of the rectangular housing of the connector, and
A connector cover is lock-coupled to the lower portion of the connector housing, and a concave portion is provided from a lower peripheral wall to a bottom wall of the connector cover,
A guide piece protrudes from the bottom surface of the bottom wall adjacent to the side wall of the lower cover substantially perpendicularly to the position facing the holding claw, and the upper end of the guide piece faces the holding claw at the bolt fastening completion position of the connector. Projecting to a position, and projecting inwardly a locking claw at its upper end, and provided with a reinforcing rib connected to the side wall at an intermediate position in the height direction of the guide piece, and
A positioning piece that fits into the recess from the bottom wall of the lower cover,
Before the connector is bolted, the outer surface of the holding claw is pressed against the guide piece, and the positioning piece is fitted into the concave portion of the connector cover so that the connector is temporarily held in the lower cover. And
The connector is lifted while the outer surface of the holding claw is slidably contacting the guide piece when the bolt is fastened, and the upper surface of the holding claw is locked to the lower surface of the locking claw of the guide piece at the bolt fastening completion position. box.   The electrical junction box according to claim 1, wherein an upper surface of the holding claw is wide and a lapping margin with the locking claw is large.   The electrical connection box according to claim 1 or 2, wherein a plurality of the connectors are accommodated in the lower cover, and the guide pieces are provided at positions facing the holding claws of the connectors.

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