JP5158943B2 - Wire distribution structure in the electrical junction box - Google Patents

Description

  The present invention relates to a wiring structure for electric wires in an electrical junction box.

  When an electric wire is drawn into the inside of the electric junction box from outside, the electric wire is usually drawn in such a manner that a grommet is attached to a through hole provided in the wall of the electric junction box and penetrates the grommet. As described in Patent Document 1, this is the same as the case where a grommet is attached to the through hole of the vehicle body panel, the grommet is inserted, and the wire harness is pulled into the vehicle. By doing in this way, rainwater etc. can be prevented from entering into an electric junction box with a grommet along an electric wire.

  However, when used in an actual environment, even if a grommet is provided, rainwater or the like may enter the inside of the electrical junction box due to capillary action through the gap between the wires.

  FIG. 3 shows an internal configuration of an electric junction box mounted on a large vehicle such as a conventional truck. This figure shows a state in which the front cover is removed. The electrical junction box is composed of a cover and an electrical junction box main body 1. The electrical junction box main body 1 includes a bottom wall 1A, a top wall 1B, a left side wall 1C, a right side wall 1D, and a back side. Side wall 1E. A drain hole (not shown) is opened in the bottom wall 1A.

  Inside the electrical junction box body 1, a fuse / relay box (a part contained in the electrical junction box) 2 is accommodated by shifting to the right side, and the electric wire is connected to the middle height of the left side surface of the fuse / relay box 2. The target parts H1 and H2 are provided, and the short electric wires 30 and 40 are connected to the electric wire connection target parts H1 and H2.

  In addition, the middle height of the left side wall 1C is provided with an electric wire inlet 3 for drawing an electric wire from the outside to the inside of the electric junction box, and is inserted through a grommet 4 attached to the electric wire inlet 3. Two pairs of electric wires 10 and 20 are drawn into the inside from the outside. And the electric wires 10 and 20 drawn in those are connected with the short electric wires 30 and 40 connected to the above-mentioned electric wire connection object part H1 and H2 via the waterproof connector 170 by the shortest distance. Therefore, the electric wires 10 and 20 are routed substantially horizontally from the electric wire inlet 3 to the electric wire connection target portions H1 and H2.

JP 2004-112911 A

  In this way, when the wire inlet 3 and the wire connection target portions H1 and H2 are at substantially the same height, and the wires 10 and 20 are arranged almost horizontally between them, the wires drawn from the outside If rainwater enters the interior of the electrical connection box from the outside of the electrical connection box through the gaps 10 and 20, there is a risk of reaching the wire connection target portions H1 and H2 as they are. For this reason, the waterproof connector 170 is adopted as a midway connector. However, the waterproof connector 170 is more expensive than a normal connector, which increases the cost.

  The present invention has been made in view of the above-described circumstances, and its purpose is to devise the wiring route of the electric wire in the electric connection box, and without using an expensive waterproof connector, the electric wire connection target portion. It is an object of the present invention to provide a wiring structure for an electric wire in an electric junction box that can prevent water from entering the battery.

In order to achieve the above-described object, the cable routing structure in the electrical junction box according to the present invention is characterized by the following (1) to ( 4 ).
(1) An electric wire lead-in port for drawing an electric wire from the outside to the inside of the electric connection box is opened on a side wall of the electric connection box, and the electric wire drawn into the electric connection box from the electric wire drawing port is The wiring structure of the electric wire in the electric connection box, which is routed toward the electric wire connection target portion of the housing component in the electric connection box facing the electric wire inlet,
The electric wire drawn from the electric wire drawing port is led to the space inside the electric connection box between the electric wire drawing port and the electric wire connection target portion by detouring to the electric wire connection target portion by taking the shortest path. A detour route is provided, and in the middle of the detour route, an electric wire rising portion is provided in which the electric wire rises from bottom to top in a route direction from the electric wire inlet to the electric wire connection target portion ,
On the inner wall of the electrical junction box, an electric wire holding part for holding the electric wire routed along the detour path is provided,
In the bypass path, in addition to the electric wire rising portion, a horizontal transition portion in which the electric wire extends in a horizontal direction, and the electric wire stands from top to bottom in a path direction from the electric wire inlet to the electric wire connection target portion. And a horizontal transition part is held by the electric wire holding part on the top wall or bottom wall of the electric junction box, near the top wall, or near the bottom wall. The electric wires are routed along the detour path .
( 2 ) In the wiring structure of the electric wire having the configuration ( 1 ) above,
As the detour path, the upper detour path for detouring the electric wire to the upper side from the shortest path and leading from the electric wire inlet to the electric wire connection target part, and detouring the electric wire to the lower side from the shortest path A lower detour path leading from the wire inlet to the wire connection target part,
In the upper detour route, in the route direction from the wire inlet to the wire connection target portion, the wire rising portion, the horizontal transition portion, and the wire falling portion are arranged in this order,
In the lower detour path, the wire falling part, the horizontal transition part, and the wire rising part are arranged in this order in the path direction from the wire inlet to the wire connection target part,
A horizontal transition portion of the upper detour path is held on the top wall of the electric junction box by the electric wire holding portion,
The horizontal transition part of the lower detour path is held on the bottom wall of the electric junction box by the electric wire holding part.
( 3 ) In the wiring structure of the electric wire having the configuration ( 2 ) above,
A horizontal wiring portion is provided between the lower end of the electric wire falling portion of the upper detour path and the electric wire connection target portion, and the electric wire drawn in from the electric wire inlet and the electric wire connection in the middle of the horizontal wiring portion A first connector that electrically connects the electric wires connected to the target portion to each other is provided in the horizontal direction,
Moreover, in the middle of the electric wire rising part of the said lower side detour path, the 2nd connector which electrically connects the electric wire drawn in from the said electric wire inlet and the electric wire connected to the said electric wire connection object part toward a perpendicular direction Provided,
The first connector and the second connector are detachably engaged with and fixed to a connector holding portion provided on the inner wall of the electrical junction box.
( 4 ) In the wiring structure of the electric wire having the configuration (1) above,
A connector is provided between the electric wire rising portion and the electric wire connection target portion.

According to the wiring structure of the electric wire having the above configuration (1), the electric wire from the electric wire inlet provided on the side wall of the electric connection box to the electric wire connection target portion is not intentionally along the shortest route, but is intentionally along the detour route. In the middle of the detour path, there is an electric wire rising part where the electric wire rises from the bottom to the upper side in the path direction from the electric wire inlet to the electric wire connection target part. The ascent can be prevented by gravity. Therefore, even if an expensive waterproof connector is not used, it is possible to effectively prevent water from entering the portion to be connected to the electric wire and to reduce the cost.
In addition, according to the wire routing structure configured as described in ( 1 ) above, the wires routed along the detour route are held by the wire holding portion, so that the wires are arranged with slack so as not to take the shortest route. It is possible to prevent play and rattling of the cable that has been found. Moreover, since the electric wire drawn into the electrical junction box can be kept in a state along the detour path regardless of the vibration of the vehicle, the effect of preventing the ingress of water can always be achieved reliably.
Moreover, according to the wiring structure of the electric wire having the configuration ( 1 ), an electric wire rising portion, a horizontal transition portion, and an electric wire falling portion are provided in the detour path, and the horizontal transition portion is electrically connected to the electric connection box by the electric wire holding portion. The top wall or the bottom wall of the door, or the vicinity of the top wall or the vicinity of the bottom wall , so that the electric wire can be simply connected to the space in the electric junction box by a U-shaped or inverted U-shaped path. And it can be arranged neatly.
According to the wiring structure of the electric wire having the above configuration ( 2 ), the electric wire drawn into the electric junction box is divided into the upper detour path and the lower detour path, and the upper detour path is At the electric wire rising portion, it is possible to reliably cut off the ingress of the water that travels along the electric wire, and rather, the water can be directed toward the lower detour path. Accordingly, it is possible to reliably prevent water from proceeding toward the electric wire connection target part.
For the lower detour route, the water that travels along the wire can be actively guided downward at the first falling edge of the wire, so that dripping of water at a high position can be prevented. The water thus generated can be smoothly guided to the inner bottom of the electric junction box and discharged from the drain hole. Moreover, since the penetration | invasion of the water which propagates an electric wire is cut off reliably in the last electric wire rising part, progress to an electric wire connection object part can be prevented.
In addition, the horizontal transition part of the upper detour path is held on the top wall of the electric junction box, and the horizontal transition part of the lower detour path is held on the bottom wall of the electric junction box, so that the electric wire swings due to the vibration of the vehicle. It is possible to prevent rattling and abnormal noise.
According to the wiring structure of the electric wire having the configuration ( 3 ), the mounting direction of the two connectors in the electric junction box is changed, so that it is easy to secure a work space in the narrow electric junction box.
According to the wiring structure of the electric wire having the above configuration ( 4 ), an inexpensive non-waterproof connector can be used when connector connection is required in the electric junction box.

  According to the present invention, since the electric wire rising portion is provided in the path from the electric wire inlet to the electric wire connection target portion, water can be effectively prevented from entering the electric wire connection target portion without using an expensive waterproof connector. And cost can be reduced.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an internal configuration of an electrical junction box including an electric wire routing structure according to an embodiment, a front view showing a state in which a front cover is removed, and FIG. 2 is a perspective view showing a partial configuration thereof It is.

  This electrical junction box is composed of a cover (not shown) and an electrical junction box body 1. The electrical junction box body 1 includes a bottom wall 1A, a top wall 1B, a left side wall 1C, and a right side wall 1D. And the rear side wall 1E. A drain hole (not shown) is opened in the bottom wall 1A.

  Inside the electrical junction box body 1, a fuse / relay box (a part contained in the electrical junction box) 2 is accommodated by being shifted to the right side, and is slightly higher than the middle of the left side surface of the fuse / relay box 2. Are provided with wire connection target portions H1 and H2, and short wire 30 and 40 are connected to the wire connection target portions H1 and H2.

  In addition, the middle height of the left side wall 1C is provided with an electric wire inlet 3 for drawing an electric wire from the outside to the inside of the electric junction box, and is inserted through a grommet 4 attached to the electric wire inlet 3. Two pairs of electric wires 10 and 20 are drawn from the outside into the electric junction box.

  Then, the electric wires 10 and 20 drawn into the electric junction box are connected to a normal connector (that is, a non-waterproof connector) 70 that is not a waterproof connector via the lower bypass route Y1 and the upper bypass route Y2. Are connected to the short electric wires 30 and 40 connected to the aforementioned electric wire connection target portions H1 and H2.

  The lower detour path Y1 and the upper detour path Y2 are secured in the space in the electrical connection box from the wire lead-in port 3 to the wire connection target portions H1 and H2, and the electric wire 10 drawn from the wire lead-in port 3 , 20 is detoured to the lower side and the upper side, respectively, from the shortest path to the wire connection target parts H1 and H2. The shortest path is a path that connects the wire inlet 3 to the wire connection target portions H1 and H2 with a substantially straight line.

  In the lower detour path Y1, the wire falling part 10A where the electric wire 10 falls from the top to the bottom in the path direction from the electric wire inlet 3 to the electric wire connection target part H1, and the horizontal transition in which the electric wire 10 extends in the horizontal direction 10C and the wire rising portion 10C where the electric wire 10 rises from the bottom to the top in the path direction from the electric wire inlet 3 to the electric wire connection target portion H1, the electric wire rising portion 10C from the electric wire inlet 3 toward the electric wire connection target portion H1. It is provided in order.

  The upper bypass path Y2 includes an electric wire rising portion 20A where the electric wire 20 rises from the bottom to the upper side in the route direction from the electric wire inlet 3 to the electric wire connection target portion H2, and a horizontal transition portion where the electric wire 20 extends in the horizontal direction. 20B and an electric wire falling portion 20C where the electric wire 20 falls from top to bottom in the path direction from the electric wire inlet 3 to the electric wire connection target portion H2, and from the electric wire inlet 3 toward the electric wire connection target portion H2. They are provided in this order.

  And the upper electric wire 20 is reversed by the horizontal transition portion 20B being engaged with an electric wire holding protruding piece (electric wire holding portion) 50 provided in the vicinity of the top wall 1B of the electric junction box body 1. The lower electric wire 10 is held along the U-shaped upper detour path Y2, and the horizontal transition portion 10B of the electric wire holding protruding piece (electric wire) provided in the vicinity of the bottom wall 1A of the electric junction box body 1 By being engaged with the holding portion) 50, the holding portion 50 is held along the U-shaped lower detour path. The upper and lower electric wire holding protruding pieces 50 protrude from the back side wall 1E of the electrical junction box body 1 toward the front, and the horizontal transition portions 10B and 20B of the electric wires 10 and 20 are inserted from the front. The electric wires 10 and 20 can be stopped on the bottom wall 1A and the top wall 1B, respectively.

  Further, a horizontal wiring portion 20D is provided between the lower end of the electric wire falling portion 20C of the upper bypass path Y2 and the electric wire connection target portion H2, and from the electric wire inlet 3 in the middle of the horizontal wiring portion 20D. The 1st connector 70 which electrically connects the drawn-in electric wire 20 and the electric wire 40 connected with the electric wire connection object part H2 mutually is arrange | positioned toward the horizontal direction. Moreover, the 2nd connector 70 which mutually connects the electric wire 10 drawn in from the electric wire inlet 3 and the electric wire 30 connected to the electric wire connection object part H1 in the middle of the electric wire rising part 10C of the lower detour path | route Y1 toward a perpendicular direction. Has been placed. The first and second connectors 70 attach and detach the clips 71 of the respective connectors 70 to the engagement holes 81 of the connector holding bracket (connector holding portion) 80 provided on the back side wall 1E of the electrical junction box body 1. By being freely engaged, it is fixed at a predetermined position inside the electric junction box body 1.

  According to the wiring structure of the electric wire having the above configuration, the electric wires 10 and 20 from the electric wire inlet 3 provided on the side wall 1C of the electric junction box to the electric wire connection target portions H1 and H2 are not along the shortest path, An electric wire that is routed along the detour routes Y1 and Y2 and rises from the bottom to the top in the route direction from the wire inlet 3 to the wire connection target portions H1 and H2 along the detour routes Y1 and Y2. Since the rising portions 10C and 20A are provided, the presence of the electric wire rising portions 10C and 20A can prevent the entry of water from the outside through the electric wires as indicated by the arrow F by gravity. Therefore, even if an expensive waterproof connector is not used as in the conventional example, it is possible to effectively prevent water from entering the wire connection target portions H1 and H2, thereby reducing the cost.

  In particular, according to the wire routing structure of the present embodiment, the wires 10 and 20 routed along the detour routes Y1 and Y2 are held by the wire holding protruding pieces 50, so the shortest route is taken. Therefore, it is possible to prevent play and rattling of the electric wires 10 and 20 that are arranged with slack. Moreover, since the electric wires 10 and 20 drawn into the electric junction box can be kept in the state along the detour paths Y1 and Y2 regardless of the vibration of the vehicle or the like, the effect of preventing the ingress of water is always ensured. be able to.

  In addition, electric wire rising portions 10C, 20A, horizontal transition portions 10B, 20B and electric wire falling portions 10A, 20C are provided in the detour paths Y1, Y2, and the horizontal transition portions 10B, 20B are electrically connected by the electric wire holding protruding pieces 50. Since it is held on the top wall 1B or the bottom wall 1A of the connection box, the electric wires 10 and 20 are simply and orderly arranged in a space in the electric connection box through a U-shaped or inverted U-shaped route. In addition, it is possible to prevent the electric wires 10 and 20 from swaying due to the vibration of the vehicle, and to prevent rattling and abnormal noise.

  Moreover, since the electric wires 10 and 20 drawn into the electric junction box are divided and arranged into the upper detour path Y2 and the lower detour path Y1, the upper detour path Y2 is the first electric wire rising portion 20A, It is possible to reliably cut off the ingress of water that travels through the electric wire 20, but rather to direct the water toward the lower detour path Y1. Accordingly, it is possible to reliably prevent the water from proceeding toward the wire connection target part H2. Moreover, about the lower detour route Y1, the first electric wire falling portion 10A can positively guide water traveling down the electric wire 10 to prevent dripping of water at a high position. The water that has entered can be smoothly guided to the inner bottom of the electrical junction box and discharged from the drain hole. In addition, since the last electric wire rising portion 10C reliably cuts off the water entering the electric wire 10, it is possible to prevent the electric wire connection target portion H1 from proceeding.

  Further, since the mounting directions of the two connectors 70 and 70 are different, it is easy to secure a work space in a narrow electrical junction box. In addition, according to the cable routing structure of the present embodiment, since the connectors 70 and 70 are provided between the wire rising portions 10C and 20C and the wire connection target portions H1 and H2, the connector is provided in the electrical connection box. If a connection is required, an inexpensive non-waterproof connector can be used.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the above embodiment, both the upper detour path Y2 and the lower detour path Y1 are provided, but only one of them may be provided.

  Moreover, in the said embodiment, although the horizontal transition part 10B of the electric wire 10 of the lower detour route Y1 is hold | maintained and fixed to the bottom wall 1A with the protrusion piece 50 for electric wire holding | maintenance, the electric wire 10 is free to the bottom wall 1A. As long as it has a play length that can be reached, the electric wire 10 does not shake even if it is not necessarily fixed to the bottom wall 1A by the electric wire holding protruding piece 50. In this case, the lower electric wire holding protruding piece 50 may be omitted.

It is a figure which shows the internal structure of the electrical junction box containing the wiring structure of the embodiment of this invention, and is a front view which shows the state which removed the front cover. It is a perspective view which shows the one part structure in the electrical-connection box of FIG. It is a front view which shows the internal structure of the electric junction box mounted in large vehicles, such as the conventional truck, and shows the state which removed the front cover.

Explanation of symbols

1: Electrical junction box body 1A: Bottom wall 1B: Top wall 1C Side wall 2: Fuse / relay box (container in electrical junction box)
3: Electric wire inlet 10: Lower electric wire 10A: Electric wire falling portion 10B: Horizontal transition portion 10C: Electric wire rising portion 20: Upper electric wire 20A: Electric wire rising portion 20B: Horizontal electric transition portion 20C: Electric wire falling portion 20D: Horizontal routing unit 50: wire holding protrusion (wire holding unit)
70: Connector Y1: Lower bypass path Y2: Upper bypass path H1, H2: Wire connection target part

Claims (4)

An electric wire inlet opening for drawing an electric wire from the outside to the inside of the electric connection box is opened on a side wall of the electric connection box, and the electric wire drawn into the electric connection box from the electric wire inlet is the electric wire inlet The wiring structure of the electric wire in the electric connection box, which is arranged toward the electric wire connection target part of the housing component in the electric connection box opposite to the electric connection box,
The electric wire drawn from the electric wire drawing port is led to the space inside the electric connection box between the electric wire drawing port and the electric wire connection target portion by detouring to the electric wire connection target portion by taking the shortest path. A detour route is provided, and in the middle of the detour route, an electric wire rising portion is provided in which the electric wire rises from bottom to top in a route direction from the electric wire inlet to the electric wire connection target portion ,
On the inner wall of the electrical junction box, an electric wire holding part for holding the electric wire routed along the detour path is provided,
In the bypass path, in addition to the electric wire rising portion, a horizontal transition portion in which the electric wire extends in a horizontal direction, and the electric wire stands from top to bottom in a path direction from the electric wire inlet to the electric wire connection target portion. And a horizontal transition part is held by the electric wire holding part on the top wall or bottom wall of the electric junction box, near the top wall, or near the bottom wall. By this, the electric wire is routed in the electric junction box, wherein the electric wire is routed along the detour path. As the detour path, the upper detour path for detouring the electric wire to the upper side from the shortest path and leading from the electric wire inlet to the electric wire connection target part, and detouring the electric wire to the lower side from the shortest path A lower detour path leading from the wire inlet to the wire connection target part,
In the upper detour route, in the route direction from the wire inlet to the wire connection target portion, the wire rising portion, the horizontal transition portion, and the wire falling portion are arranged in this order,
In the lower detour path, the wire falling part, the horizontal transition part, and the wire rising part are arranged in this order in the path direction from the wire inlet to the wire connection target part,
A horizontal transition portion of the upper detour path is held on the top wall of the electric junction box by the electric wire holding portion,
2. The electric wire routing structure in the electric junction box according to claim 1 , wherein a horizontal transition portion of the lower detour path is held by a bottom wall of the electric junction box by the electric wire holding portion. A horizontal wiring portion is provided between the lower end of the electric wire falling portion of the upper detour path and the electric wire connection target portion, and the electric wire drawn in from the electric wire inlet and the electric wire connection in the middle of the horizontal wiring portion A first connector that electrically connects the electric wires connected to the target portion to each other is provided in the horizontal direction,
Moreover, in the middle of the electric wire rising part of the said lower side detour path, the 2nd connector which electrically connects the electric wire drawn in from the said electric wire inlet and the electric wire connected to the said electric wire connection object part toward a perpendicular direction Provided,
It said first connector and second connector, in the electric junction box according to claim 2, characterized in that it is fixed by being detachably engaged to the connector holding portion provided on the inner wall of the electrical junction box Wire routing structure.   The wiring structure in the electric junction box according to claim 1, wherein a connector is provided between the electric wire rising portion and the electric wire connection target portion.

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