JP2023074590A - Electric connection box - Google Patents

Abstract

To enhance rigidity of an electric connection box, while suppressing a sharp rise of a prime cost of a housing.SOLUTION: An electric connection box comprises: a metal housing 10 having a housing chamber 10a surrounded with a cylindrical outer peripheral wall 11 and a bottom wall 12; and an electric connection tool 20 electrically connecting a core wire of a first electric wire We1 and a core wire of a second electric wire We2 in the housing chamber. The outer peripheral wall includes a weighted wall body 11A on the assumption that an impact load is applied to an outer wall surface 11b. The outer wall surface of the weighted wall body includes a weighted wall surface Sl on the assumption that the impact load is received. The bottom wall includes: a main bottom part 12A; a raised bottom 12B that is protruded from an inner wall surface 11c of the weighted wall body on the weighted wall body side from the main bottom part, and which is off-set on an open 10b side of one end from the main bottom part and a back side of a centroid position of the weighted wall body in the inner wall surface; and a connection bottom part 12C connecting them. The housing includes a plurality of outer ribs 13A connecting the inner wall surface of the weighted wall body, a bottom surface 12Ba of the raised bottom part, and a bottom surface 12Ca of a connection bottom part in a space surrounded with the weighted wall body, the raised bottom part, and the connection bottom part.SELECTED DRAWING: Figure 3

Description

The present invention relates to electrical junction boxes.

Conventionally, in a vehicle, for example, it is interposed between a secondary battery and a plurality of power supply objects, and power is distributed to each power supply object. An electrical connection box is installed to electrically connect the electric wires of the housing. Various parts such as parts for electrical connection of the respective electric wires and parts arranged on the electric circuit (relays, fuses, etc.) are accommodated in the housing chamber inside the housing. For example, Patent Document 1 below discloses an electric connection box of this type.

JP 2014-93888 A

By the way, the electric connection box may be installed in a place where an impact load is applied, for example, in a vehicle crash test. In such an electric connection box, the rigidity of the housing is increased to protect the parts inside the housing. For example, in a conventional electrical connection box, the rigidity of the housing is increased by erecting a plurality of ribs at locations where impact loads are applied in a collision test on the outer wall surface of the housing. However, when the housing uses a metal material such as aluminum as a raw material and a plurality of ribs are erected on the outer wall surface of the cylindrical outer wall, a slide is required in addition to the main mold to form the ribs. become necessary. For this reason, in the conventional electric connection box, there is a possibility that the cost of the housing will rise due to the increase in mold cost.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an electric connection box capable of increasing rigidity while suppressing an increase in the cost of the housing.

The present invention comprises a metal housing having a cylindrical outer wall with one end open and a housing chamber surrounded by a bottom wall closing the opening at the other end of the outer wall; an electrical connector for electrically connecting the core wire of the first wire on the side of the first connection object drawn into the chamber and the core wire of the second wire on the side of the second connection object, wherein the outer peripheral wall is an outer wall surface; a load-bearing wall assumed to be subjected to an impact load, the outer wall surface of the load-bearing wall having a load-bearing surface assumed to receive the impact load, and the bottom wall comprising: and a bottom portion on the side of the load-receiving wall projecting from the inner wall surface of the load-receiving wall on the side of the load-receiving wall relative to the main bottom, the bottom portion on the side of the load-receiving wall protruding from the inner wall surface of the load-receiving wall, closer to the opening side of the one end than the main bottom and A raised bottom part offset to the back side of the center of gravity of the load-bearing surface on the inner wall surface, and a connecting bottom part connecting the main bottom part and the raised bottom part, wherein the housing includes the load-bearing wall body. A space surrounded by the raised bottom portion and the connecting bottom portion has a plurality of outer ribs connecting the inner wall surface of the load-bearing wall, the bottom surface of the raised bottom portion, and the bottom surface of the connecting bottom portion. do.

In the electrical connection box according to the present invention, the bottom wall of the housing is formed into a crank shape by the main bottom portion, the raised bottom portion, and the connecting bottom portion. In this electrical junction box, the inner wall surface of the load-bearing wall, the bottom surface of the raised bottom, and the bottom surface of the connection bottom are arranged in the space surrounded by the load-bearing wall, the raised bottom, and the connecting bottom in the housing. A plurality of outer ribs connecting the In the electrical connection box according to the present invention, the bottom wall and the plurality of outer ribs ensure the rigidity of the housing when an impact load is applied to the load-bearing surface of the load-bearing wall. Therefore, in the case, there is no need to provide reinforcing portions such as reinforcing ribs on the outer wall surface of the load-bearing wall, and the outer wall surface can be formed in a planar shape. In other words, in the electric connection box according to the present invention, as a mold for molding the housing, there is no need for a slide for forming reinforcing portions such as reinforcing ribs on the outer wall surface of the load-bearing wall, and only the main mold is used. Since it is sufficient to use it, it is possible to suppress the increase in the cost of the housing due to the increase in mold costs. Therefore, this electrical connection box can increase the rigidity while suppressing the increase in cost of the housing.

FIG. 1 is a perspective view showing an electric connection box of an embodiment. 2 is a plan view of the electrical connection box of the embodiment viewed in the direction of arrow A in FIG. 1. FIG. 3 is a cross-sectional view taken along the line XX of FIG. 2. FIG. FIG. 4 is a perspective view showing the electric connection box of the embodiment with the cover removed. FIG. 5 is a perspective view of the case body viewed from the opening side. FIG. 6 is a perspective view of the case body viewed from the bottom wall side. FIG. 7 is a perspective view showing the electrical connector together with the second shielded wire and the like. FIG. 8 is a perspective view showing the electrical connector with the cover member removed.

EMBODIMENT OF THE INVENTION Below, embodiment of the electric junction box which concerns on this invention is described in detail based on drawing. In addition, this invention is not limited by this embodiment.

[Embodiment]
One embodiment of an electric connection box according to the present invention will be described with reference to FIGS. 1 to 8. FIG.

Reference numeral 1 in FIGS. 1 to 4 indicates an electrical junction box of this embodiment. Reference numeral WH in FIGS. 1 to 4 denotes a wire harness of the present embodiment including the electrical junction box 1. FIG.

The electrical connection box 1 is interposed between a first connection object (not shown) and a second connection object (not shown), and the first electric wire We1 on the side of the first connection object and the second connection object 1 to 4). The electric connection box 1 forms a wire harness WH together with the first electric wire We1 and the second electric wire We2. At least one first electric wire We1 and at least one second electric wire We2 are used in the electric connection box 1 and the wire harness WH. For example, the electrical connection box 1 and the wire harness WH shown here use shielded wires for the first wires We1 and the second wires We2, respectively, to prevent noise from entering from the outside. Therefore, in the following description, the electric connection box 1 and the wire harness WH are described as including the first shielded electric wire We1 as an example of the first electric wire We1 and the second shielded electric wire We2 as an example of the second electric wire We2. conduct.

Although not shown, the first shielded wire We1 includes a cylindrical conductive core wire, a cylindrical insulating inner coating (inner sheath) that concentrically covers the core wire, and a cylindrical inner coating that concentrically covers the inner coating. It comprises an electrically conductive braid and a cylindrical insulating outer covering (outer sheath) concentrically surrounding the braid. The second shielded wire We2 includes, although not shown, a cylindrical conductive core wire, a cylindrical insulating inner sheath (inner sheath) that concentrically covers the core wire, and a cylindrical sheath that concentrically covers the inner sheath. a cylindrical electrically conductive braid and a cylindrical insulating outer sheath (outer sheath) concentrically surrounding the braid.

The electrical junction box 1 and the wire harness WH illustrated here are mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and include a secondary battery as a first connection object and a power distribution object (for example, a second connection object). , supplementary notes, etc. to which power is to be supplied), power is distributed to the power distribution object. Therefore, in the electrical connection box 1 and the wire harness WH illustrated here, a pair of first shielded wires We1, We1 (first shielded wire We1 for positive electrode, first shielded wire We1 for negative electrode) electrically connected to the secondary battery An electric wire We1) and a pair of second shielded electric wires We2, We2 (second shielded electric wire We2 for positive electrode, second shielded electric wire We2 for negative electrode) electrically connected to the power distribution object are used. In addition, in the electric connection box 1 and the wire harness WH illustrated here, a plurality of sets of the pair of second shield electric wires We2, We2 are used.

This electrical connection box 1 has a metal housing 10 (FIGS. 1 to 6). The electrical junction box 1 also includes a conductive electrical connector 20 for electrically connecting the first shielded wire We1 and the second shielded wire We2 inside the housing 10 (FIGS. 3, 4 and 4). 7). The electrical connection box 1 also includes terminal fittings 30 for releasing noise carried on the braid of the second shield wires We2 (FIGS. 3, 4 and 7). In addition, since the electric connection box 1 is provided with a wire insertion portion (second wire insertion portion described later) 17 for inserting the second shield wire We2 through the inside and outside of the housing 10, the housing 10 can be accommodated. As a waterproof/dustproof measure for the chamber 10a, a waterproof/dustproof member 40 is provided to prevent liquid and dust from entering the housing chamber 10a from outside the housing 10 via the second wire insertion portion 17 (FIGS. 1 to 4). and FIG. 7).

The housing 10 is made of a metal material such as aluminum or an aluminum alloy and fixed to a conductive vehicle body (not shown). The housing 10 also has a storage chamber 10a (FIGS. 3 to 5). The housing 10 is provided with a working opening 10b for inserting or assembling parts to be placed in the housing chamber 10a (FIGS. 4 and 5).

The storage chamber 10a accommodates an electrical connector 20 that electrically connects the core wire of the first shield wire We1 and the core wire of the second shield wire We2. The electrical connector 20, the first shielded wire We1, and the second shielded wire We2 are inserted into the housing chamber 10a from the working opening 10b.

The housing 10 shown here includes a metal case main body 10A and a metal cover 10B (FIGS. 1 to 3). The housing 10 is fixed to the vehicle body with the work opening 10b facing upward. For example, here, the case body 10A is screwed and fixed to the floor panel of the vehicle body.

The case main body 10A has a cylindrical outer peripheral wall 11 (FIGS. 1 to 6). In the case main body 10A, the inner space surrounded by the outer peripheral wall 11 is used as the storage chamber 10a, and the inner opening of the annular end at one end of the outer peripheral wall 11 in the cylinder axis direction is used for work. It is used as the opening 10b. The cover 10B is attached to the annular end surface of the one end annular end to close the one end opening (working opening 10b). The outer peripheral wall 11 shown here has a flat surface arranged on the same plane as the annular end face at one end thereof, and has a flange portion 11a annularly projecting outward from the annular end portion at one end thereof. (Figures 3 to 6). The cover 10B is attached to this flange portion 11a.

Further, the case body 10A has a cylindrical outer peripheral wall 11 which is open at one end and has a bottom wall 12 closing the opening at the other end (FIGS. 1 to 6). Thus, the case body 10A is surrounded by the outer peripheral wall 11 and the bottom wall 12, and has a working opening 10b at one end of the outer peripheral wall 11 that communicates with the housing chamber 10a.

Here, the electric junction box 1 of the present embodiment is mounted in a place where an impact load is applied in a vehicle collision test or the like. For this reason, in the electrical connection box 1, the rigidity of the housing 10 is increased as described below so that the electrical connection tools 20 and the like in the storage chamber 10a are protected even if an impact load is applied.

In this electrical connection box 1, it is assumed that an impact load will be applied to the outer peripheral wall 11 of the case body 10A during a vehicle collision test or the like. In other words, the outer peripheral wall 11 has a load-bearing wall 11A on the assumption that an impact load is applied to the outer wall surface 11b during a collision test or the like (FIGS. 2 to 6). The load-bearing wall 11A shown here is one of the four walls forming the outer peripheral wall 11 of rectangular tube shape. The outer wall surface 11b of the load-bearing wall 11A has a load-bearing surface Sl that is supposed to receive an impact load (FIG. 2). An impact load is applied to the load-bearing surface Sl from the vehicle body or other parts around the load-bearing wall 11A, for example, when a vehicle collision test is performed. In this electrical connection box 1, the bottom wall 12 is formed in the following shape to suppress the deformation of the load-bearing wall 11A against the impact load applied to the load-bearing surface Sl. Suppresses the deformation of 10.

The bottom wall 12 is composed of a main bottom portion 12A, which is the main portion thereof, and a bottom portion on the load-bearing wall 11A side that protrudes from the inner wall surface 11c of the load-bearing wall 11A on the load-bearing wall 11A side of the main bottom 12A. The main bottom 12A and the raised bottom 12B are connected to the raised bottom 12B which is offset from the main bottom 12A to the side of one end opening (working opening 10b) and to the back side of the center of gravity of the load bearing surface Sl on the inner wall surface 11c. and a connecting bottom 12C (FIGS. 3, 5 and 6). The bottom wall 12 is roughly divided into three regions, namely, a raised bottom portion 12B, a connecting bottom portion 12C, and a main bottom portion 12A, starting from the load-bearing wall body 11A side. It forms a crank shape with the connecting bottom portion 12C.

In the bottom wall 12, the raised bottom portion 12B functions as a reinforcing rib that receives an impact load applied to the load-bearing surface Sl of the load-bearing wall 11A. The impact load received by the raised bottom portion 12B is transmitted to the connecting bottom portion 12C, and transmitted to the main bottom portion 12A via the connecting bottom portion 12C. In the bottom wall 12, the raised bottom portion 12B, the connecting bottom portion 12C, and the main bottom portion 12A form a crank shape, so that when an impact load is applied to the load receiving surface Sl, the impact load can be absorbed. can be done. Therefore, in the housing 10, deformation of the load-bearing wall 11A can be suppressed when an impact load is applied to the load-bearing surface Sl of the load-bearing wall 11A.

However, the bottom wall 12 deforms under this impact load when absorbing the impact load. Therefore, in order to suppress deformation of the housing 10, it is desirable to suppress deformation of the bottom wall 12 as well. Therefore, in the case main body 10A of the housing 10, the inner wall surface 11c of the load-bearing wall 11A and the bottom surface of the raised bottom 12B are provided in the space surrounded by the load-bearing wall 11A, the raised bottom 12B, and the connecting bottom 12C. A plurality of outer ribs 13A connecting 12Ba and the bottom surface 12Ca of the connecting bottom portion 12C are provided (FIGS. 3 and 6). Each outer rib 13A is spaced apart from each other.

In the case body 10A of the housing 10, when an impact load is applied to the load-bearing surface Sl of the load-bearing wall 11A, the impact load is received by the raised bottom portion 12B and the plurality of outer ribs 13A. Deformation of the space surrounded by the body 11A, the raised bottom portion 12B, and the connecting bottom portion 12C can be suppressed. Therefore, in the case main body 10A of the housing 10, deformation of the bottom wall 12 is suppressed when an impact load is applied to the load-bearing surface Sl of the load-bearing wall 11A. For this reason, in the electric connection box 1, even if an impact load is applied to the load-bearing surface Sl of the load-bearing wall 11A, deformation of the case body 10A of the housing 10 is suppressed, so that it can be accommodated in the accommodation chamber 10a. Enclosed components such as the electrical connector 20 can be protected from impact loads.

As described above, in the electrical connection box 1, the rigidity of the housing 10 when an impact load is applied to the load-bearing surface S1 of the load-bearing wall 11A is ensured by the bottom wall 12 and the plurality of outer ribs 13A. Therefore, there is no need to provide a reinforcing portion such as a reinforcing rib on the outer wall surface 11b of the load-bearing wall 11A. Therefore, in the load-bearing wall 11A, the outer wall surface 11b can be made flat. Therefore, the outer wall surface 11b of the load-bearing wall 11A shown here is formed in a planar shape (FIGS. 2 and 3). As a result, the case main body 10A of the housing 10 does not require a slide for forming reinforcing portions such as reinforcing ribs on the outer wall surface 11b of the load-bearing wall 11A as a mold for molding, and only the main mold is required. should be used. Therefore, in the electric connection box 1, it is possible to suppress the increase in the cost of the housing due to the increase in mold cost.

Furthermore, in the electrical junction box 1, there is no need to provide a reinforcing portion such as a reinforcing rib on the outer wall surface 11b of the load-bearing wall 11A, and the outer wall surface 11b of the load-bearing wall 11A does not have a protruding shape. . For this reason, the electric connection box 1 can suppress an increase in the physical size of the housing 10, so that the mountability in a vehicle can be improved. In addition, since the outer wall surface 11b of the load-bearing wall 11A of the electric connection box 1 is smooth, even if the peripheral parts interfere with the outer wall 11b of the load-bearing wall 11A, the durability of the peripheral parts is maintained. can suppress the decrease in

By the way, in the case main body 10A of the housing 10, the larger the impact load on the load receiving surface Sl, the larger the projection amount of the raised bottom portion 12B from the inner wall surface 11c of the load receiving wall 11A. By enlarging the ribs 13A, it is sufficient to ensure the rigidity that can withstand a large impact load. As described above, in the electric connection box 1, if there is an excess space in the storage chamber 10a, the body of the housing 10 can be made larger by providing reinforcing portions such as reinforcing ribs on the outer wall surface 11b of the load-bearing wall 11A. Even if not, by increasing the size of the raised bottom portion 12B and the plurality of outer ribs 13A, it is possible to ensure the rigidity that can withstand a large impact load.

Further, the case main body 10A of the housing 10 may be provided with a plurality of inner ribs 13B connecting the inner wall surface 11c of the load receiving wall 11A and the inner wall surface 12Bb of the raised bottom portion 12B in the storage chamber 10a (FIG. 3). and FIG. 5). Thereby, in this electric connection box 1, the rigidity of the housing 10 can be further improved. Here, storage components such as the electrical connector 20 are accommodated in the accommodation chamber 10a. For this reason, the inner rib 13B shown here has an arcuately recessed end face on the side of the housing component in order to avoid interference with the housing component.

Further, in the case main body 10A, the rigidity of the housing 10 is improved by suppressing the connecting bottom portion 12C from collapsing toward the accommodating chamber 10a when receiving an impact load. Therefore, the connecting bottom portion 12C shown here is formed as an inclined wall portion that approaches the inner wall surface 11c of the load-bearing wall 11A toward the one end opening (working opening 10b) side of the main bottom portion 12A (FIG. 3). ).

In the case main body 10A, the first shielded wire We1 and the second shielded wire We2 are drawn into the housing chamber 10a from the one end opening (working opening 10b) side. Also, in the case body 10A, the electrical connecting device 20 is inserted into the housing chamber 10a through the working opening 10b, and the electrical connecting device 20 is screwed and fixed through the working opening 10b.

The electrical connection tool 20 includes a conductive member that electrically connects the core wire of the first shield wire We1 and the core wire of the second shield wire We2. The electrical connecting device 20 shown here electrically connects the core wire of one of the pair of first shielded wires We1, We1 in the pair of first shielded wires We1, We1, and the pair of second shielded wires We2, We2. A first bus bar 21 for electrically connecting the core wire of one of the second shielded wires We2 to a core wire of the other first shielded wire We1 of the pair of first shielded wires We1, We1, which is electrically connected to the pair of second shields. and a second bus bar 22 for electrically connecting the core wire of the other second shield wire We2 of the wires We2, We2 (FIG. 8). The respective main bodies 21a and 22a of the first busbar 21 and the second busbar 22 are made of a metal material and formed into a plate shape. The first shielded wire We1 is electrically connected to the first bus bar 21 or the second bus bar 22 via a first connector 51 (FIGS. 3 and 4) at one end. Although not shown here, the other end of the first shielded wire We1 is provided with a connector for electrical connection to the first connection object side.

Also, the electrical connection tool 20 physically and electrically connects the first terminal portion 23a to the first bus bar 21, and is interposed between the first bus bar 21 and one of the second shield wires We2. It has a fuse 23 which is closed (FIG. 8). The electrical connector 20 serves as another conductive member to physically and electrically connect the second terminal portion 23b of the fuse 23, and to electrically connect the core wire of one of the second shield wires We2. A third bus bar 24 is provided (FIG. 8). A main body 24a of the third bus bar 24 is formed in a plate shape from a metal material. The fuse 23 and the third bus bar 24 are provided for each one of the second shield wires We2. The second shielded wire We2 is electrically connected to the second busbar 22 or the third busbar 24 via a second connector 52 (FIGS. 3 and 7) at one end. Although not shown here, the other end of the second shielded wire We2 is provided with a connector for electrical connection to the second connection object side.

Further, the electrical connecting device 20 includes a male screw member 25A for screwing and fixing the first terminal portion 23a of the fuse 23 to the first bus bar 21 and a second terminal portion 23b of the fuse 23 to the third bus bar 24 by screwing. and a male screw member 25B for stopping and fixing. The electrical connecting device 20 is provided with female screw members 26 that are screwed together with the male screw members 25A and 25B (FIG. 8).

In addition, the electrical connector 20 is an electrically insulating insulating member that holds the conductive members (the first bus bar 21, the second bus bar 22, and the third bus bar 24) and is screwed and fixed to the housing 10 in the housing chamber 10a. Prepare. The electrical connecting device 20 includes a holding member (hereinafter referred to as “bus bar holding member") 27 (Figs. 3, 7 and 8). The busbar holding member 27 is molded from an insulating material such as synthetic resin. The busbar holding member 27 shown here is integrally formed with the conductive members (the first busbar 21, the second busbar 22, and the third busbar 24) by insert molding. Further, here, the busbar holding member 27 is also integrally formed with the male screw members 25A and 25B by insert molding.

The busbar holding member 27 exposes the respective main bodies 21a, 22a, and 24a of the first busbar 21, the second busbar 22, and the third busbar 24 on the top surface 27U on the side of the work opening 10b (FIG. 8), and Male screw members 25A and 25B are projected from the top surface 27U toward the work opening 10b. In the first bus bar 21 and the third bus bar 24, the exposed surfaces of the main bodies 21a and 24a are used as fuse connecting portions. The electric connecting device 20 further includes a cover member 28, which is assembled to the busbar holding member 27 and covers the main bodies 21a, 22a, 24a and the male screw members 25A, 25B from the working opening 10b side, as another insulating member (Fig. 3, FIGS. 4 and 7). The cover member 28 is molded from an insulating material such as synthetic resin.

In the electrical connector 20, the cover member 28 is formed with an upper connector for fitting and connecting the first connector 51 on the working opening 10b side. Here, since the pair of first shielded wires We1, We1 with the first connector 51 is drawn into the accommodation chamber 10a, the first upper connector 28a for fitting and connecting one first connector 51 and the other first connector 51 are connected. A second upper connector 28b for mating connection is provided (FIGS. 3 and 7). The first upper connector 28a is connected to the terminal portion 21b (FIG. 8) of the first bus bar 21 on the inner side by fitting and connecting the first connector 51 of the first shielded wire We1 to the first shielded wire We1. The core wire of We1 is electrically connected. Further, the second upper connector 28b is connected to the terminal portion 22b (FIG. 8) of the second bus bar 22 on the inner side by fitting and connecting the first connector 51 of the other first shield wire We1 to the other first connector 28b. The core wire of the shield electric wire We1 is electrically connected.

In the case main body 10A, a pair of first shielded wires We1, We1 are inserted from the work opening 10b into the housing chamber 10a in which the electrical connector 20 is housed, and one end of one of the first shielded wires We1 is connected to the first shielded wire We1. 1 connector 51 is fitted and connected to the first upper connector 28a of the electrical connection tool 20, and the first connector 51 at one end of the other first shielded wire We1 is connected to the second upper connector 28b of the electrical connection tool 20. A mating connection is made (FIGS. 3 and 4).

In the case body 10A, the outer peripheral wall 11 is notched from the annular end face at one end on the work opening 10b side, and the pair of first shield wires We1, We1 are inserted through the inside and outside of the housing 10 (in other words, , pull the pair of first shielded wires We1, We1 from the outside of the housing 10 into the housing chamber 10a, or pull out the pair of first shielded wires We1, We1 from the housing 10a to the outside of the housing 10) An insertion portion (hereinafter referred to as a “first wire insertion portion”) 14 is formed (FIG. 5). The first wire insertion portion 14 shown here is formed in a shape in which the outer peripheral wall 11 and the flange portion 11a are also notched. The end face of the first wire insertion portion 14 on the work opening 10b side is used as an insertion opening for inserting the pair of first shield wires We1 and We1 into the first wire insertion portion 14 . The first wire insertion portion 14 forms an opening whose insertion opening is closed by the cover 10B when the cover 10B is assembled to the case main body 10A. Here, the opening serves as an opening that connects the inside and outside of the housing 10, and is used as a lead-in port or a lead-out port for the pair of first shielded wires We1, We1. The first wire insertion portion 14 may be provided for each first shield wire We1.

The pair of first shielded wires We1, We1 shown here are held together by a synthetic resin wire holder 55, for example, and fixed to the housing 10 via the wire holder 55 (Fig. 4). The wire holder 55 is arranged in the first wire insertion portion 14 . The wire holder 55 is fixed to the housing 10 by being screwed to the case main body 10A. In the receiving chamber 10a of the case main body 10A, a wire fixing portion 15 having a male screw member B1 such as a stud bolt is provided in a state of protruding from the inner wall surface 11c of the outer peripheral wall 11 (FIG. 5). The wire holder 55 is screwed and fixed to the wire fixing portion 15 by screwing a female screw member (not shown) onto the male screw member B1.

Furthermore, in the electrical connector 20 , a lower connector for fitting and connecting the second connector 52 is formed on the busbar holding member 27 on the bottom wall 12 side. Here, the pair of second shielded wires We2, We2 with the second connector 52 is drawn into the housing chamber 10a. For this reason, here, a first lower connector 27a to which one of the second connectors 52 of the pair of second shielded wires We2, We2 is fitted and connected, and a second lower connector 27b to which the other second connector 52 is fitted and connected. are provided (FIGS. 3 and 7). Also, here, a pair of second shielded wires We2, We2 with a plurality of sets of second connectors 52 are pulled into the housing chamber 10a. Therefore, here, the first lower connector 27a and the second lower connector 27b are provided in pairs for each combination of the pair of second shield wires We2, We2.

The first lower connector 27a and the second lower connector 27b are formed on a lower surface 27L of the busbar holding member 27 on the side of the bottom wall 12 (FIGS. 7 and 8). The second connector 52 of one of the pair of second shielded wires We2, We2 is fitted and connected to the first lower connector 27a so that the terminal portion (illustrated) of the inner third bus bar 24 is connected to the first lower connector 27a. ) are electrically connected to the core wire of one of the second shield wires We2. The first lower connector 27a is provided for each third bus bar 24 (for each second shield wire We2 on one side). The second connector 52 of the other second shielded wire We2 of the pair of second shielded wires We2, We2 is fitted to connect the second lower connector 27b to the terminal portion of the inner second bus bar 22. (not shown) is electrically connected to the core wire of the other second shield electric wire We2. The second lower connector 27b is provided for each terminal portion 22c of the second bus bar 22 (for each second shield wire We2 on the other side).

In the electrical connector 20, the busbar holding member 27 or the cover member 28 is screwed and fixed to the fixing portion 16 (FIG. 5) of the housing 10 in the housing chamber 10a by a screw member (male screw member or female screw member). The fixed portion 16 is a portion protruding from the inner wall surface 11c of the outer peripheral wall 11 of the case body 10A, and has a plane facing the working opening 10b and parallel to the working opening 10b. The fixing portion 16 is formed with a female screw portion N2 having a screw axis in a direction perpendicular to the plane thereof (FIG. 5). The busbar holding member 27 or the cover member 28 is a flat plate-shaped piece projecting from its outer peripheral surface, and has one plane facing the work opening 10b and the other plane facing the bottom wall 12 in the housing chamber 10a. A fixed portion 27c arranged facing is provided (FIG. 8). A through hole 27c1 through which a male screw member (not shown) is inserted is formed in the fixed portion _27c . The fixed portion 27c is fixed by placing the other flat surface on the flat surface of the fixed portion 16 on the working opening 10b side and screwing the male screw member inserted into the through hole _27c1 into the female screw portion N2. The portion 16 is screwed and fixed. As a result, the busbar holding member 27 or the cover member 28 is fixed to the case main body 10A inside the housing chamber 10a. Here, the busbar holding member 27 is provided with a fixed portion 27c, and the busbar holding member 27 is fixed to the fixing portion 16 of the housing 10 by screwing.

The electrical connection box 1 is provided with a plurality of sets (here, four sets) of combinations of the fixing portion 16 and the fixed portion 27c that form pairs. In the electrical connection box 1, a male screw member (not shown) such as a stud bolt is provided in the fixing portion 16, and a female screw member (not shown) is screwed into the male screw member to fix the electric connection box 1. The portion 16 and the fixed portion 27c may be fixed by screwing.

The storage chamber 10a includes a space (hereinafter referred to as a "first storage chamber") _10a1 from the assembled electrical connector 20 to an opening (working opening 10b) at one end, and the electrical connector 20 in the room. to the bottom wall 12 (hereinafter referred to as "second storage chamber") _10a2 and 10a2 (Fig. 3).

In the storage chamber 10a, the first shielded wire We1 with the first connector 51 is housed in the first storage chamber _10a1 , and the first shielded wire We1 is pulled out from the first storage chamber _10a1 . In addition, in this housing chamber 10a, the second shielded wire We2 with the second connector 52 is housed in the second housing chamber 10a2, and this second shielded wire We2 extends from the second housing chamber _10a2 to the first housing chamber 10a _{. 1} and pulled out from the first storage chamber _10a1 .

Here, the second connector 52 at one end of all the second shielded wires We2 is fit-connected to the first lower connector 27a or the second lower connector 27b before the electrical connector 20 is housed in the housing chamber 10a. (Fig. 7). Therefore, when the electrical connection tool 20 is inserted into the storage chamber 10a from the work opening 10b, the second shielded wire We2 is inserted together with the electrical connection tool 20 from the work opening 10b into the storage room 10a. be. In addition, the terminal metal fitting 30 and the waterproof/dustproof member 40 are attached to the second shielded wire We2, for example, before it is housed in the housing chamber 10a (FIG. 7). The terminal fitting 30 and the waterproof/dustproof member 40 are assembled to the housing 10 (here, the case main body 10A) after the second shielded wire We2 is accommodated in the accommodation chamber 10a.

The terminal fitting 30 is a grounding member for releasing noise carried on the braided body of the second shield electric wire We2 from the housing 10 to the vehicle body. Therefore, this terminal fitting 30 is formed of a metal material, and physically and electrically connects the braided body of the second shield wire We2. This terminal fitting 30 is physically and electrically connected to the housing 10 .

The terminal fitting 30 includes an electrical connection portion 31 to which the braided body of the second shield wires We2 is physically and electrically connected, and a fixed portion 32 to be fixed to the housing 10 in the housing chamber 10a. (Fig. 7).

Specifically, the electrical connection portion 31 physically and electrically connects to the braided body of the second shielded wire We2 whose external coating is partially stripped off or stripped off over the entire circumference and exposed. It is a cylindrical part connected to the The electrical connection portion 31 shown here has the exposed braided body arranged in a cylinder, and the inner peripheral wall of the cylinder is physically and electrically connected to the exposed braided body. For example, the electrical connection portion 31 has a single-piece shape before being connected to the braided body. The inner peripheral wall is physically and electrically connected to the braid.

The fixed portion 32 is formed as a flat plate-like piece, and has a circular through hole 32a (FIG. 7).

The terminal fitting 30 shown here is shaped as a flag terminal (FIG. 7). A flag terminal is a terminal in which two electrical connection portions 31 are arranged in parallel with the cylinder axis direction aligned in the same direction, and a fixed portion 32 is arranged offset from the aggregate of the two electrical connection portions 31. That is.

This terminal fitting 30 is provided for each combination of a set of the first lower connector 27a and the second lower connector 27b. In the terminal metal fitting 30, the braided body of the second shield electric wire We2 connected to one of the pair of the first lower connector 27a and the second lower connector 27b is connected to one of the two electrical connection portions 31. The braided body of the second shielded wire We2 physically and electrically connected to one of the pair of first lower connectors 27a and second lower connectors 27b and connected to the other of the pair of the first lower connector 27a and the second lower connector 27b is connected to the two electrical connection portions. 31 are physically and electrically connected to the other.

This terminal fitting 30 is fixed to the housing 10 in the housing chamber 10a. The terminal fitting 30 shown here is arranged in the accommodation chamber 10a near the second wire insertion portion 17, which will be described later, of the case body 10A, and is fixed to the case body 10A. Also, the electric connection box 1 includes a plurality of terminal fittings 30 . In this electric connection box 1, all the terminal fittings 30 are arranged in the vicinity of the second wire insertion portion 17 for each terminal fitting 30 in the housing chamber 10a and fixed to the case main body 10A.

In the case body 10A, an outer peripheral wall 11 is cut out from an annular end face at one end on the work opening 10b side, and the second shielded wire We2 is inserted through the inside and outside of the case 10 (in other words, the second shield wire We2). A wire insertion portion (hereinafter referred to as a “second wire insertion portion”) that draws the shielded wire We2 from the outside of the housing 10 into the housing chamber 10a or pulls out the second shielded wire We2 from the housing chamber 10a to the outside of the housing 10 ) 17 is formed (FIG. 5). The second wire insertion portion 17 shown here is formed in a shape in which the outer peripheral wall 11 and the flange portion 11a are also cut out. The end face of the second wire insertion portion 17 on the working opening 10b side is used as an insertion port for inserting the pair of second shield wires We2, We2 into the second wire insertion portion 17. As shown in FIG. The second wire insertion portion 17 forms an opening whose insertion opening is closed by the cover 10B when the cover 10B is assembled to the case main body 10A. Here, the opening serves as an opening that connects the inside and outside of the housing 10, and is used as a lead-in port or a lead-out port for the second shielded wires We2.

The second wire insertion portion 17 shown here is formed for each terminal fitting 30 (that is, for each combination of a set of the first lower connector 27a and the second lower connector 27b). The two second shield wires We2 connected to the two electrical connection portions 31 of are inserted through the housing 10 over the inside and outside. The second wire insertion portion 17 may be provided for each second shield wire We2.

The second wire insertion portion 17 also functions as a protective member holding portion that holds the waterproof/dustproof member 40 . Therefore, the waterproof/dustproof member 40 is also inserted into the second wire insertion portion 17 together with the second shield wire We2, and the waterproof/dustproof member 40 is assembled.

The waterproof/dustproof member 40 is a member that prevents liquid and dust from entering the storage chamber 10 a from outside the housing 10 via the second wire insertion portion 17 . Therefore, the waterproof/dustproof member 40 is an elastically deformable member made of a rubber material. The main part of the waterproof/dustproof member 40 is a cylindrical portion through which the pair of second shielded wires We2, We2 are inserted.

In order to fix the terminal fitting 30 near the waterproof/dustproof member 40, the case main body 10A has a fixing portion 18 for placing and fixing the fixed portion 32 of the terminal fitting 30 on the work opening 10b side of the housing chamber 10a. (Fig. 5). This fixing portion 18 is provided for each terminal fitting 30 . For example, a male screw member B3 such as a stud bolt is vertically provided on the fixing portion 18 shown here, and a fixed portion 32 having the male screw member B3 inserted through a through hole 32a is placed thereon (FIG. 4). , FIGS. 5 and 7). The fixed portion 32 is screwed and fixed to the fixing portion 18 by a female screw member N3 screwed onto the male screw member B3 (FIG. 4).

In the electrical connection box 1, first, all the second shielded wires We2 with the second connectors 52 are attached to the electrical connection tools 20, and the terminal fittings 30 and the waterproof/dustproof members 40 are attached to all the second shielded wires We2. assemble it. Next, in the electrical connection box 1, the electrical connection tool 20 and the second shielded wire We2 are inserted into the housing chamber 10a through the working opening 10b, and the electrical connection tool 20 is assembled to the case main body 10A. In the electrical connection box 1, the fixed portion 32 of the terminal fitting 30 is placed on the fixed portion 18 of the case body 10A, and the waterproof/dustproof member 40 is inserted into the second wire insertion portion 17 of the case body 10A. to fix the fixed portion 32 to the fixed portion 18 by screwing. Also, in this electrical junction box 1, two first shielded wires We1 with first connectors 51 are inserted into the housing chamber 10a through the working opening 10b, and connected to the electrical connector 20 of the housing chamber 10a and the case main body. Assemble to 10A. After that, in the electric connection box 1, the cover 10B is attached to the case main body 10A, and the work opening 10b is closed with the cover 10B. A female screw portion N4 is formed on the flange portion 11a of the case main body 10A shown here, and the cover 10B is placed on the screw shaft of the female screw portion N4 with the center of the through hole (not shown) aligned ( 1 to 5). The cover 10B is screwed and fixed to the flange portion 11a by screwing the male screw member B4 inserted through the through hole into the female screw portion N4 (FIGS. 1 to 3).

As described above, in the electrical connection box 1 of the present embodiment, the bottom wall 12 of the case body 10A of the housing 10 is formed into a crank shape by the main bottom portion 12A, the raised bottom portion 12B, and the connecting bottom portion 12C. In the electric connection box 1, the inner wall surface 11c of the load-bearing wall 11A is provided in the space surrounded by the load-bearing wall 11A, the raised bottom portion 12B, and the connecting bottom portion 12C in the case body 10A of the housing 10. and a plurality of outer ribs 13A connecting the bottom surface 12Ba of the raised bottom portion 12B and the bottom surface 12Ca of the connecting bottom portion 12C. In the electrical connection box 1 of this embodiment, the bottom wall 12 and the plurality of outer ribs 13A ensure the rigidity of the housing 10 when an impact load is applied to the load bearing surface S1 of the load bearing wall 11A. ing. Therefore, in the case 10, the outer wall surface 11b of the load-bearing wall 11A does not need to be provided with reinforcing portions such as reinforcing ribs, and the outer wall surface 11b can be formed in a planar shape. In other words, in the electric junction box 1 of the present embodiment, the mold for forming the case main body 10A of the housing 10 is a slide for forming reinforcing portions such as reinforcing ribs on the outer wall surface 11b of the load-bearing wall 11A. is not required, and only the main mold can be used. Therefore, the electric connection box 1 can increase the rigidity while suppressing the cost increase of the housing.

1 electrical connection box 10 housing 10a storage chamber 10b working opening (opening at one end)
11 outer wall 11b outer wall 11c inner wall 11A load-bearing wall 12 bottom wall 12A main bottom 12B raised bottom 12Ba bottom 12Bb inner wall 12C connection bottom 12Ca bottom 13A outer rib 13B inner rib 20 electric connector Sl load-bearing surface We1 first Shield wire (first wire)
We2 Second shield wire (second wire)

Claims (4)

A metal housing having a cylindrical outer wall with one end open and a storage chamber surrounded by a bottom wall that closes the opening at the other end of the outer wall;
an electrical connector for electrically connecting the core wire of the first wire on the side of the first connection object pulled into the housing chamber from the outside of the housing and the core wire of the second wire on the side of the second connection object;
with
The outer peripheral wall has a load-bearing wall that assumes that an impact load is applied to the outer wall surface,
the outer wall surface of the load-bearing wall body has a load-bearing surface expected to receive the impact load;
The bottom wall includes a main bottom portion and a bottom portion on the side of the load-receiving wall projecting from an inner wall surface of the load-receiving wall on the side of the load-receiving wall relative to the main bottom. a raised bottom portion offset to the back side of the center of gravity of the load-bearing surface on the inner wall surface on the opening side; and a connecting bottom portion connecting the main bottom portion and the raised bottom portion;
The housing includes the inner wall surface of the load-bearing wall, the bottom surface of the raised bottom, and the bottom surface of the connection bottom within a space surrounded by the load-bearing wall, the raised bottom, and the connecting bottom. An electrical junction box characterized by having a plurality of connecting outer ribs. 2. The electrical junction box according to claim 1, wherein said outer wall surface of said load-bearing wall is formed in a planar shape. 3. The electrical connection according to claim 1, wherein the housing has a plurality of inner ribs connecting the inner wall surface of the load receiving wall and the inner wall surface of the raised bottom portion in the housing chamber. box. 4. The electric power supply according to claim 1, wherein the connection bottom portion is an inclined wall portion that approaches the inner wall surface of the load-bearing wall body toward the opening side of the one end rather than the main bottom portion. junction box.

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