JP5219645B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box, and more particularly to an electrical junction box of a type in which a lower cover that covers and protects the periphery of the wire group is provided on the lower surface side of a case body to which the wire group is connected.

  4 and 5 show a conventional example of an electric connection box mounted on a vehicle in order to connect an electric circuit such as a fuse to a wire harness arranged in the vehicle.

  An electrical connection box 101 shown here is disclosed in the following Patent Document 1, and includes a case main body 103 that houses circuit components such as a fuse connected to a wire harness 102, and an upper covering the upper portion of the case main body 103. The cover 105 and the lower cover 107 that covers the lower portion of the case body 103 are configured.

As shown in FIG. 5A, the case main body 103 has a group of electric wires 102a, 102b, and 102c drawn from a main line 102A bundled in one wire harness 102 drawn into the case from the case lower surface side. And connected to a circuit component (not shown) in the case.
The upper part of the case main body 103 is opened so that the circuit components accommodated therein can be accessed.

  The upper cover 105 is detachably attached to the upper portion of the case main body 103 so as to cover the open portion 103 a on the upper portion of the case main body 103.

  The lower cover 107 is attached to the lower surface side of the case main body 103 and covers the lower surface side of the case main body 103 so as to regulate the wiring direction of the wire harness 102 connected to the circuit component.

  In the case of the conventional electrical junction box 101, the lower cover 107 accommodates the electric wires 102a, 102b, and 102c drawn from the main line 102A and restricts the wiring direction of these electric wires 107A and the case main body 103. It is divided into a second lower cover 107B that accommodates the trunk line 102A that passes under and regulates the wiring direction thereof, and has a structure that covers the entire area of the lower surface side of the case main body 103.

  In the case of this conventional example, the upper end of the second lower cover 107B is hinged to the case body 103, and is attached so as to be rotatable outward as indicated by an arrow X in FIG. ing.

  The reason for this mounting structure is that, as shown in FIG. 5B, when the trunk wire 102A of the wire harness 102 connected to the case body 103 is accommodated in a form in which the wiring direction is changed by 180 °. This is for facilitating the accommodation work of the trunk line 102A.

  The wire harness 102 that is 180 ° converted and pulled out of the first lower cover 107A is fixed to the bottom of the first lower cover 107A by a binding band 109 so as to maintain the wiring configuration.

JP 2007-282320 A

  However, in the electrical connection box 101 equipped with the lower cover 107 so as to cover the entire lower surface of the case main body 103 as described above, the lower cover 107 is increased in size, so that the entire electrical connection box 101 is increased in size. In an environment where there are many restrictions on the installation space, such as the problem, it is difficult to secure the installation space.

  Further, the trunk wire 102A of the wire harness 102 having a large number of wires accommodated has considerable rigidity and a large bending radius must be secured. Therefore, in the configuration in which the trunk wire 102A is accommodated in the lower cover 107, the lower cover 107 Not only is the size increase unavoidable, but the strength of the lower cover 107 must also be improved by increasing the thickness of the lower cover 107 in order to firmly hold the bent portion of the main line 102A. There was also a problem of inviting.

  Further, in order to improve the operability when the electric wires 102a, 102b, 102c of the wire harness 102 and the main line 102A are accommodated, it is necessary to devise such as dividing the lower cover 107 into two parts as in the above-described conventional example. Further, the complexity of the structure of the lower cover 107 causes a problem of increasing the cost.

  The object of the present invention is to solve the above-mentioned problems, and by reducing the size of the lower cover, the overall size can be reduced, and the attachment to a vehicle or the like can be improved by reducing the installation space. Another object of the present invention is to provide an electrical junction box that can reduce the cost by simplifying the structure.

The above-described object of the present invention is achieved by the following configuration.
(1) Upper cover,
A lower cover containing circuit components in a space formed between the upper cover;
A plurality of electric wires electrically connected to the circuit component and drawn from the lower surface side of the lower cover, and a trunk line of a wire harness routed on the lower surface side of the lower cover;
An electrical junction box comprising:
The lower cover is divided into a first lower cover and a second lower cover,
The first lower cover does not accommodate the trunk line therein , and has a wire lead-in inlet through which the plurality of electric wires branched from the trunk line are led in, and a lower surface side of the upper cover is formed at a portion other than the wire lead-in inlet. It is attached to the lower surface side of the upper cover so as to cover,
The second lower cover is attached to the lower surface side of the first lower cover so as to cover the periphery of the wire lead-in entrance of the first lower cover into which the plurality of wires are led out. box.

(2) A fixing mechanism for fixing a portion exposed from the second lower cover of the trunk portion of the wire harness extending on the lower surface of the first lower cover is further provided on the lower surface side of the first lower cover,
The electrical connection box according to (1), wherein a wiring direction of the trunk line is regulated by the second lower cover and the fixing mechanism.

  According to the configuration of (1) above, the first lower cover has a wire lead-in entrance for drawing in and out a plurality of wires branched from the main line, and covers the entire lower region of the upper cover at a portion other than the wire lead-in entrance. Due to the configuration, the main line is not covered, so that it can be made thinner and smaller than the conventional lower cover. In addition, the second lower cover is configured to cover a part of the area around the wire lead-in entrance of the first lower cover into which a plurality of wires are led in and out, so that the conventional lower cover that covers the entire lower surface of the case body and the trunk line is used. The size can be reduced compared to the above. And since the whole electrical junction box is reduced in size by size reduction of a 1st lower cover and a 2nd lower cover, the improvement of the attachment property to vehicles etc. by the reduction of an installation space is realizable.

  In addition, the second lower cover covers only the portion of the trunk line where the thin electric wire of the wire harness is drawn out and needs to be protected. Since it is not necessary to include the entire part that overlaps under one lower cover, it does not require much strength compared to the conventional lower cover that accommodates most of the trunk lines of the wire harness, and can also be reduced in weight by reducing the wall thickness. it can.

  Furthermore, since the second lower cover described above does not accommodate many portions of the trunk of the wire harness that is difficult to bend because of its high rigidity, the second lower cover can mainly accommodate the wire group drawn from the trunk, so that the conventional example As described above, there is no need to use a two-part structure for the main line or to make the case main body movable so that the structure can be simplified and the resin material can be saved due to the above-mentioned weight reduction. You can also plan.

  According to the configuration of (2), the trunk line of the wire harness passing through the lower surface of the first lower cover is hardly accommodated in the second lower cover, but is installed on the lower surface side of the first lower cover using a binding band or the like. Since the wiring direction can be tightly regulated by fixing with a fixed fixing mechanism, the regulation of the wiring direction of the wire harness is not reduced by reducing the size of the lower cover, providing an orderly wiring configuration can do.

  According to the electrical junction box according to the present invention, the first lower cover has a wire lead-in entrance through which a plurality of wires branched from the trunk line are led in and covers the entire lower region of the upper cover at a portion other than the wire lead-in entrance, Since the trunk line is not covered, it can be made thinner and smaller than the conventional lower cover. Further, since the second lower cover covers a part of the area around the wire lead-in entrance of the first lower cover into which a plurality of wires are led in and out, compared to the conventional lower cover that covers the entire lower surface of the case body and the trunk line. It can be downsized. And since the whole electrical junction box is miniaturized by size reduction of a lower cover, the improvement of the attachment property to vehicles etc. by the reduction of an installation space is realizable.

  In addition, the second lower cover covers only the portion of the trunk line where the thin electric wire of the wire harness is drawn out and needs to be protected, and the second lower cover entirely overlaps under the first lower cover of the highly rigid wire harness. Since it is not necessary to cover the portion, the strength is not so required, and the thickness can be reduced and the weight can be reduced.

  Furthermore, since the second lower cover does not accommodate the entire portion of the wire harness trunk that overlaps the first lower cover of the wire harness, which is difficult to bend and requires troublesome accommodation, the second lower cover should have a simple structure without a two-part structure or a rotating part. In addition, the resin material can be saved with the above weight reduction, and the cost can be reduced.

  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 side view of an electrical junction box according to an embodiment of the present invention, with a second lower cover removed from the lower surface of the first lower cover, and FIG. 2 is a perspective view of the assembled electrical junction box shown in FIG. FIGS. 3 and 3 are longitudinal sectional views showing a state in which a wire harness is connected to the electrical junction box shown in FIG.

  The electrical junction box 1 according to this embodiment is an electrical circuit mounted on a vehicle in order to connect an electrical circuit such as a fuse or a relay to the wire harness 2 routed in the vehicle, or to branch-connect the wirings. In the connection box, the first lower cover 3 that accommodates circuit components such as fuses connected to the wire harness 2, the upper cover 5 that covers the upper part of the first lower cover 3, and the lower part of the first lower cover 3 are limited. The second lower cover 7 is covered.

  As shown in FIG. 3, the first lower cover 3 includes a first electric wire group formed by a plurality of electric wires 2 b drawn from the main line 2 </ b> A bundled in one wire harness 2 from the lower surface side of the first lower cover 3. It is drawn into the lower cover 3 and connected to the circuit components 11, 12, etc. in the first lower cover 3.

  The upper part of the first lower cover 3 is opened so as to be accessible to the circuit components 11, 12 and the like accommodated therein.

  The upper cover 5 is detachably attached to the upper part of the first lower cover 3 so as to cover the open part of the upper part of the first lower cover 3.

  The second lower cover 7 is attached to the lower surface side of the first lower cover 3 and covers the lower surface side of the first lower cover 3 so as to regulate the wiring direction of the wire harness 2 connected to the circuit components 11, 12 and the like.

  In the case of the present embodiment, the second lower cover 7 is not the entire lower surface area of the first lower cover 3, but the electric wire 2 b group led out from the trunk line 2 </ b> A of the wire harness 2 in the lower surface area of the first lower cover 3. It covers only the limited area around the wire lead-in inlet 15 of the first lower cover 3 and the periphery thereof, which is a portion led into and out.

  The electric wire outlet 15 of the first lower cover 3 is equipped near one end side (left end side in FIG. 3) of the lower surface of the first lower cover 3. Therefore, the second lower cover 7 is attached to the lower portion of the first lower cover 3 by engagement so as to cover one end side of the lower surface of the first lower cover 3.

  The second lower cover 7 is provided with openings 16 through which the trunk line 2 </ b> A of the wire harness 2 is inserted at both ends of the first lower cover 3 facing in the longitudinal direction.

  In the case of the present embodiment, the main wire 2A portion of the wire harness 2 passing through the lower surface of the first lower cover 3 while being exposed from the second lower cover 7 is bound and fixed to the lower surface side of the first lower cover 3 by the binding band 18. The binding tool attaching part 19 as a fixing mechanism is equipped.

  The binding tool attaching portion 19 may be an opening portion that penetrates the side wall of the first lower cover 3 so that the binding band 18 can be inserted through, for example.

In the electrical junction box 1 according to the embodiment described above, the first lower cover 3 covers the lower surface side of the upper cover 5 at a portion other than the wire lead-in inlet 15, so that the trunk line 2 </ b> A is not covered, compared to the conventional lower cover. It can be made thinner and smaller.
Further, the second lower cover 7 attached to the lower portion of the first lower cover 3 is configured not to cover the entire area of the lower surface of the first lower cover 3 but only a part of the area in the vicinity of the wire outlet 15, so that the case body Compared with a conventional lower cover that covers the entire area of the lower surface of the second lower cover 7, the second lower cover 7 can be reduced in size. And since the whole electrical junction box is miniaturized by size reduction of the 1st lower cover 5 and the 2nd lower cover 7, the improvement of the attachment property to vehicles etc. by reduction of an installation space is realizable.

  Further, the second lower cover 7 covers a limited area such as the thin electric wire 2b drawn out from the main line 2A of the wire harness 2 and the surrounding area, and accommodates the electric wire to accommodate and regulate the wiring direction. As compared with the conventional lower cover that accommodates many portions of the trunk line of the wire harness, it is not necessary to include the entire portion that overlaps the first lower cover 3 of the trunk line 2A of the highly rigid wire harness 2. There is no need for strength, and the weight can be reduced by reducing the wall thickness.

  Further, the second lower cover 7 does not accommodate the entire portion of the main wire 2A of the main wire 2A of the wire harness 2 that is difficult to bend because of its high rigidity, and therefore has a two-part structure as in the conventional example. In addition, it is not necessary to make the attachment to the first lower cover movable, the structure can be simplified, the resin material can be saved with the above weight reduction, and the cost can be reduced.

  Further, in the case of the electrical junction box 1 of the present embodiment, on the lower surface side of the first lower cover 3, the trunk line 2 </ b> A of the wire harness 2 passing through the lower surface of the first lower cover 3 while being exposed from the second lower cover 7 is bound with the binding band 18. Thus, a binding tool mounting portion 19 is provided as a fixing mechanism for binding and fixing.

  Therefore, many portions of the trunk line 2A of the wire harness 2 passing through the lower surface of the first lower cover 3 are not accommodated in the second lower cover 7, but are provided on the lower surface side of the first lower cover 3 using the binding band 18. Since the wiring direction can be firmly regulated by fixing it to the binding tool attaching portion 19, the size of the second lower cover 7 does not reduce the regulation of the wiring direction of the wire harness 2. An orderly wiring configuration can be provided.

FIG. 6 is a side view of the electric junction box according to the embodiment of the present invention with the second lower cover removed from the lower surface of the first lower cover. It is a perspective view of the assembled state of the electrical junction box shown in FIG. It is a longitudinal cross-sectional view of the state which connected the wire harness to the electrical-connection box shown in FIG. It is a disassembled perspective view of the conventional electrical junction box. FIG. 4A is an assembly diagram in a state where one of a pair of lower covers that are divided into two in the electrical junction box shown in FIG. 4 is opened, and FIG. 4B is a pair that is divided into two in the electrical junction box shown in FIG. It is an assembly drawing of the state which closed the lower cover and accommodated even the trunk line of the wire harness.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrical junction box 2 Wire harness 2A Trunk line 2b Electric wire 3 1st lower cover 5 Upper cover 7 2nd lower cover 11, 12 Circuit component 15 Electric wire outlet 16 Opening 18 Binding band 19 Binding tool attachment part

Claims (2)

An upper cover,
A lower cover containing circuit components in a space formed between the upper cover;
A plurality of electric wires electrically connected to the circuit component and drawn from the lower surface side of the lower cover, and a trunk line of a wire harness routed on the lower surface side of the lower cover;
An electrical junction box comprising:
The lower cover is divided into a first lower cover and a second lower cover,
The first lower cover does not accommodate the trunk line therein , and has a wire lead-in inlet through which the plurality of electric wires branched from the trunk line are led in, and a lower surface side of the upper cover is formed at a portion other than the wire lead-in inlet. It is attached to the lower surface side of the upper cover so as to cover,
The second lower cover is attached to the lower surface side of the first lower cover so as to cover the periphery of the wire lead-in entrance of the first lower cover into which the plurality of wires are led out. box. A fixing mechanism for fixing a portion exposed from the second lower cover of the trunk portion of the wire harness extending on the lower surface of the first lower cover, on the lower surface side of the first lower cover;
The electrical connection box according to claim 1, wherein a wiring direction of the trunk line is regulated by the second lower cover and the fixing mechanism.

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