JP2019088123A - Frame, electric connection box and wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame having a structure capable of increasing the strength of a resin molding die, and an electric connection box including the frame. It also provides a wire harness with an electrical junction box. An electric junction box mounted on an automobile includes an electric block and a housing for accommodating the electric block. The housing includes a frame 12 to which the electric block is assembled, and an upper cover and a lower cover that cover one opening of the frame 12 and the other opening. The frame 12 includes an inner peripheral wall 23 and an outer peripheral wall 22, a plurality of connecting ribs 26 connecting them, and a gap formed by the connecting ribs 26. The plurality of connecting ribs 26 are configured to include a first connecting rib 29 extending from one opening side of the inner peripheral wall 23 and the outer peripheral wall 22, and a second connecting rib 30 extending from the other opening side. The first connecting rib 29 and the second connecting rib 30 are arranged and formed in an independent state in which the ends thereof are not integrated with each other at the intermediate position 28 between the inner peripheral wall 23 and the outer peripheral wall 22. [Selection diagram] FIG. 6

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an electrical connection box mounted on a vehicle and a resin frame forming the electrical connection box. The present invention also relates to a wire harness provided with an electric connection box and wired in a car.

  An electric connection box mounted on a vehicle is configured to include an electric block and a housing for housing the electric block (see, for example, Patent Document 1 below). The electrical block is formed such that a plurality of electrical components are assembled and the electrical components are connected to a predetermined circuit. On the other hand, the housing is configured to include a frame (housing main body) on which the electric block is assembled and fixed, and an upper cover and a lower cover that cover one opening and the other opening of the frame.

JP, 2016-25802, A

  In the prior art, the frame has a double-walled structure. Therefore, the inner and outer walls are disposed with a slight gap so as not to enlarge the frame. When resin molding such a frame with a mold, there are the following problems. That is, there is a problem that the mold piece for forming the gap is thin and the piece is elongated in the demolding direction, and as a result, the strength of the piece is lowered.

  In addition, if the strength of the piece is low, the cost of the mold, for example, for maintenance will increase.

  The present invention has been made in view of the above-described circumstances, and a frame having a structure capable of enhancing the strength of a resin molding die, an electrical connection box including the frame, and a wire harness including the electrical connection box The task is to provide.

  The frame of the present invention according to claim 1 made to solve the above problems is an assembly part to which an electric block having a plurality of electric parts is to be assembled, an inner peripheral wall surrounding the assembly part, and the inner peripheral wall An outer peripheral wall provided on the outer side of the inner peripheral wall, a plurality of connecting ribs connecting the inner peripheral wall and the outer peripheral wall, and a gap defined by the plurality of connecting ribs between the inner peripheral wall and the outer peripheral wall; The plurality of connection ribs are a first connection rib extending from an opening side of the inner peripheral wall and the outer peripheral wall to an intermediate position of the inner peripheral wall and the outer peripheral wall, the other of the inner peripheral wall and the outer peripheral wall And a second connecting rib extending from the opening side to the intermediate position, and the first connecting rib and the second connecting rib are separated because the ends are not integrated at the intermediate position. Placed in the state It is characterized in.

  According to the present invention having the features of the first aspect, the gap between the inner peripheral wall and the outer peripheral wall is formed by the arrangement and the length of the first connecting rib and the second connecting rib constituting the plurality of connecting ribs. The mold piece can be made wider. It is also possible to shorten the pieces in the direction of die removal. Therefore, the strength of the piece can be increased compared to the conventional example.

  According to a second aspect of the present invention, in the frame according to the first aspect, the plurality of connection ribs are arranged in a state in which the distance between the first connection ribs is different from the distance between the second connection ribs. It is characterized in that it is formed.

  According to the present invention having the features of claim 2, for example, the distance between the second connection ribs can be made wider than the distance between the first connection ribs, so that the number of second connection ribs can be increased. It can be reduced. If the number of second connection ribs is reduced, the amount of resin material used can be reduced, thereby contributing to the cost reduction of the frame itself.

  The electric connection box of the present invention according to claim 3 made to solve the above problems is a frame according to claim 1 or 2, an electric block assembled to an assembly portion of the frame, and the frame And a second cover provided to cover the other opening of the frame.

  According to the present invention having the features of claim 3 as described above, by including the frame according to claim 1 or 2 in the configuration, the cost for maintenance of the mold, for example, can be reduced, thereby the electrical connection box It can contribute to cost reduction.

  A wire harness according to claim 4 of the present invention, which has been made to solve the above problems, is characterized in that the terminal is provided with the electric connection box according to claim 3 and is arranged in an automobile.

  According to the present invention having the features of claim 4 as described above, it is possible to provide a wire harness in which the waterproof structure of the electrical connection box is improved.

  According to the frame of the present invention, it is possible to enhance the strength of the mold for molding the same. Moreover, according to the electrical connection box of the present invention, it is possible to achieve cost reduction. Moreover, according to the wire harness of this invention, it is effective in the ability to provide a better wire harness.

It is a perspective view showing one embodiment of a frame and an electrical connection box of the present invention. It is a top view of an electrical connection box. It is the sectional view on the AA line of FIG. It is a top view of a frame. It is the BB sectional drawing of FIG. It is a cross-sectional perspective view of the flame | frame made into the cross section in the position of the BB line of FIG. It is a perspective view of a frame. It is an enlarged view of the circle C of FIG. It is a schematic diagram of a resin mold. It is a schematic diagram of the resin mold as a comparative example. It is sectional drawing of the flame | frame shape | molded by the metal mold | die of the comparative example of FIG.

  An electrical connection box mounted on a vehicle includes an electrical block and a housing for housing the electrical block. The housing includes a frame to which the electric block is assembled, and an upper cover and a lower cover which cover one opening and the other opening of the frame. The frame is configured to include an inner peripheral wall and an outer peripheral wall, a plurality of connecting ribs connecting the same, and a gap defined by the connecting ribs. The plurality of connection ribs are configured to include a first connection rib extending from one opening side of the inner circumferential wall and the outer peripheral wall, and a second connection rib extending from the other opening side. The first connection rib and the second connection rib are disposed and formed so as not to be integrated at the end portions at an intermediate position between the inner peripheral wall and the outer peripheral wall.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a frame and an electrical connection box of the present invention. 2 is a plan view of the electrical connection box, FIG. 3 is a sectional view taken along the line A-A of FIG. 2, FIG. 4 is a plan view of the frame, FIG. 5 is a sectional view taken along the line B-B of FIG. 7 is a perspective view of a frame, FIG. 8 is an enlarged view of circle C of FIG. 7, and FIG. 9 is a schematic view of a resin molding die. 10 is a schematic view of a resin molding die as a comparative example, and FIG. 11 is a cross-sectional view of a frame molded by the die of the comparative example of FIG. In addition, arrow P in a figure shall show an up-down direction, arrow Q shall show the left-right direction, and arrow R shall show the front-back direction.

About the Configuration of Electrical Connection Box 1
In FIGS. 1 to 3, the electrical connection box 1 is mounted on a track in an exposed state to the outside (this is an example). Specifically, it is mounted on a portion of the truck between the cabin and the loading platform where it rains or snows. Such an electrical connection box 1 includes an electrical block 2 and a housing 3 for housing the electrical block 2. Further, the electric connection box 1 is configured such that a wire harness (not shown) is drawn into the inside of the housing 3 (the wire harness is provided with the electric connection box 1 at a predetermined position such as this terminal, ).

<About electricity block 2>
In FIG. 3, the electrical block 2 is provided as a member to which a plurality of electrical components are assembled. Further, the electric block 2 is provided as a member to which the electric component is connected to a predetermined circuit. Specifically, the relay 4 is assembled to the resin relay assembly 5 and the fuses 6, 7 and 8 are assembled to the resin fuse assemblies 9, 10 and 11, respectively.

  The electric block 2 as described above is a cassette type, and is detachably assembled to a frame 12 described later. With regard to the electrical block 2, this name may be read as the cassette block 2.

<About Case 3>
In FIG. 1 to FIG. 3, the housing 3 is made of insulating resin, and the frame 12 to which the electric block 2 is detachably assembled, and the upper cover 14 (one of the upper cover 13 covering the upper opening 13 of the frame 12). And a lower cover 16 (the other cover) covering the lower opening 15 of the frame 12. Such casing 3 is provided with fixed legs 17, 18, 19. Further, the housing 3 is formed with an insertion hole 20 through which a wire harness (not shown) is inserted and a terminal accommodation space 21 for the terminal of the wire harness.

  The upper opening 13 is an opening including one opening of an outer peripheral wall 22 and an inner peripheral wall 23 described later. Further, the lower opening 15 is an opening including the other opening of the outer peripheral wall 22 and the inner peripheral wall 23.

<About frame 12>
In FIG. 1 and FIG. 4, the frame 12 is a resin molded product, and includes an outer peripheral wall 22 having a height extending in the vertical direction of the arrow P, and an inner peripheral wall 23 disposed inside the outer peripheral wall 22. , And is formed into a box-shaped member that is open at the top and bottom. The outer peripheral wall 22 of such a frame 12 is provided with a lock portion (reference numeral omitted) for the upper cover 14 and the lower cover 16. The fixed legs 17 and 18 are also provided on the outer peripheral wall 22. On the other hand, on the inner side of the inner wall 23, an assembling portion 24 to which the electric block 2 is assembled is formed. The assembling portion 24 is formed in accordance with the shape of the cassette type electric block 2. The frame 12 has the outer peripheral wall 22 and the inner peripheral wall 23 so that the portions of the outer peripheral wall 22 and the inner peripheral wall 23 form a double wall structure 25.

<About the double wall structure 25>
In FIGS. 4 to 8, the double-walled structure 25 includes an outer peripheral wall 22, an inner peripheral wall 23, a plurality of connecting ribs 26 connecting the outer peripheral wall 22 and the inner peripheral wall 23, an outer peripheral wall 22 and an inner peripheral wall 23. And a gap 27 defined by a plurality of connection ribs 26.

<About a plurality of connection ribs 26>
In FIGS. 4 to 8, the plurality of connection ribs 26 extend straight from one opening (upper opening 13) side of the outer peripheral wall 22 and the inner peripheral wall 23 to an intermediate position 28 of the outer peripheral wall 22 and the inner peripheral wall 23. The first connection rib 29 and the second connection rib 30 that extends straight from the other opening (lower opening 15) side of the outer peripheral wall 22 and the inner peripheral wall 23 to the intermediate position 28 are configured. The first connection rib 29 and the second connection rib 30, which are a plurality of connection ribs 26, are arranged and formed in the illustrated state in which the end portions of these ribs are not integrated at the intermediate position 28 (this embodiment) In a staggered arrangement).

  At the intermediate position 28, the first connection rib 29 is formed such that its lower end (rib end) is located slightly lower than the upper end (rib end) of the second connection rib 30. Be done. In other words, the second connecting rib 30 is formed such that its upper end is located slightly above the lower end of the first connecting rib 29. The lower end of the first connection rib 29 and the upper end of the second connection rib 30 are not limited to the above-described staggered arrangement, and may be arranged at the same position in the horizontal direction.

  Although not shown, the distance between the first connection ribs 29 and the distance between the second connection ribs 30 may be arranged differently. For example, the distance of the present embodiment may be maintained with the number of the first connection ribs 29 unchanged, and the number of the second connection ribs 30 may be reduced to increase the distance. In this case, since the number of ribs is reduced, the amount of use of the resin material is reduced, and as a result, the cost of the frame 12 can be reduced.

<About the gap 27>
In FIG. 4 to FIG. 8, the gap 27 is formed in a space that communicates from one opening (upper opening 13) of the outer peripheral wall 22 and the inner peripheral wall 23 to the other opening (lower opening 15). For example, if there is moisture at the position of the upper opening 13, the gap 27 is formed so that the moisture can be moved (dropped) to the lower opening 15.

<About the effect of frame 12>
In FIGS. 4 to 8, since the frame 12 has the double wall structure 25 as described above, the strength of the mold for molding the frame 12 (resin mold) can be enhanced. This is discussed below with reference to FIGS. 9-11.

<About mold 31>
In FIG. 9, the mold 31 for resin molding is a vertical mold, and is configured such that a parting line PL is provided in alignment with the intermediate position 28. Reference numeral 32 denotes a fixed mold, reference numeral 33 denotes a movable mold, reference numeral 34 denotes a piece of the fixed mold 32, and reference numeral 35 denotes a piece of the movable mold 33.

  The dimensions of the piece 34 of the fixed mold 32 and the piece 35 of the movable mold 33 are set in accordance with the arrangement of the first connection rib 29 and the second connection rib 30 and the distance between the outer peripheral wall 22 and the inner peripheral wall 23. Here, regarding the piece 34 of the fixed mold 32 indicated by “(A)”, the dimension is set such that the length in the vertical direction is L1 and the length in the horizontal direction is W1. Further, with respect to the piece 35 indicated by “(B)” of the movable mold 33, the dimension is set such that the length in the vertical direction is L1 and the length in the horizontal direction is W2. Since the lengths of the pieces 34 and 35 in the left and right direction are set to W1 and W2, respectively, strength can be ensured compared to a comparative example described later.

Regarding the frame 36 and the mold 37 of the comparative example
10 and 11, in the frame 36 of the comparative example, the connecting rib 38 is formed straight and long in the vertical direction. Therefore, the dimensions of the piece 40 of the fixed mold 39 and the piece 42 of the movable mold 41 in the mold 37 of the comparative example are set in accordance with the arrangement and the like of the plurality of connection ribs 38. Here, regarding the piece 40 of the fixed mold 39 indicated by “(C)”, the dimension is set such that the length in the vertical direction is L1 and the length in the horizontal direction is W3. In addition, regarding the piece 42 indicated by “(D)” of the movable mold 41, the dimension is set such that the length in the vertical direction is L1 and the length in the horizontal direction is W3.

<About the effect of mold 31 and frame 12>
9 to 11, when comparing the mold 31 and the mold 37 of the comparative example, although the lengths of the pieces 34, 35, 40, 42 are the same as L1, they differ in the length in the left-right direction It can be seen that the strength of the mold 31 is enhanced by this difference. That is, while the length in the left-right direction of the piece 34 shown by "(A)" of the fixed mold 32 is W1, the length in the left-right direction of the piece 40 shown by "(C)" of the fixed mold 39 However, since it is set to W3 (W1> W3) shorter than the above W1, it can be seen that the piece 34 of the fixed mold 32 has higher strength in area (or in volume). Further, while the length in the left-right direction of the piece 35 indicated by "(B)" of the movable mold 33 is W2, the length in the left-right direction of the piece 42 indicated by "(D)" of the movable mold 41 However, since W3 (W2> W3), which is shorter than the W2, is set, it can be seen that the piece 35 indicated by the movable mold 33 has higher strength in area (or in volume). Therefore, by adopting the plurality of connection ribs 26 (the first connection rib 29 and the second connection rib 30) in the frame 12, the strength of the pieces 34, 35 can be enhanced.

<About upper cover 14>
In FIGS. 1 to 3, the upper cover 14 has a ceiling wall 43 and a peripheral wall 44 with a low height, and is formed as a shallow bottom and lid-shaped member. Such upper cover 14 is provided with a locking portion (reference numeral omitted) for the frame 12. The ceiling wall 43 is assumed to be the highest wall of the walls constituting the housing 3.

<About lower cover 16>
In FIG. 1, the lower cover 16 has a bottom wall 45 and a peripheral wall 46 with a low height, and is formed as a shallow bottom, lid-shaped member. Such lower cover 16 is provided with a lock portion (reference numeral omitted) for the frame 12. The lower cover 16 is also provided with the fixed leg portion 19.

<About the effect of electrical connection box 1>
As described above with reference to FIGS. 1 to 11, according to the electric connection box 1 of the embodiment of the present invention, since the frame 12 is included in the configuration, maintenance of, for example, the mold 31 is required. The cost can be reduced, which can contribute to the cost reduction of the electrical connection box 1.

  It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... electrical connection box, 2 ... electrical block, 3 ... housing | casing, 4 ... relay (electrical part), 5 ... relay assembly part, 6, 7, 8 ... fuse (electrical part), 9, 10, 11 ... fuse assembly Part 12 Frame 13 Upper opening (one opening) 14 Upper cover (one cover) 15 Lower opening (other opening) 16 Lower cover (other cover) 17, 18 , 19: fixed leg portion, 20: insertion hole, 21: terminal accommodation space, 22: outer peripheral wall, 23: inner peripheral wall, 24: assembled portion, 25: double wall structure, 26: connection rib, 27: gap, 28: middle position, 29: first connection rib, 30: second connection rib, 31: mold, 32: fixed mold, 33: movable mold, 34, 35: piece, 43: ceiling wall, 44: peripheral wall , 45 ... bottom wall, 4 ... peripheral wall

Claims (4)

A plurality of parts connecting the inner peripheral wall and the outer peripheral wall, an assembling portion to which an electric block having a plurality of electric parts is to be assembled, an inner peripheral wall surrounding the assembling portion, an outer peripheral wall provided outside the inner peripheral wall A connection rib, and a gap defined by the plurality of connection ribs between the inner peripheral wall and the outer peripheral wall,
The plurality of connection ribs are a first connection rib extending from an opening side of the inner peripheral wall and the outer peripheral wall to an intermediate position of the inner peripheral wall and the outer peripheral wall, the other of the inner peripheral wall and the outer peripheral wall And a second connecting rib extending from the opening side to the intermediate position,
The first connection rib and the second connection rib are disposed and formed in an independent state without being integrated with each other at the intermediate position. In the frame of claim 1,
The frame is characterized in that the plurality of connection ribs are arranged in a state in which the distance between the first connection ribs and the distance between the second connection ribs are different. The frame according to claim 1 or 2, an electric block assembled to the assembly portion of the frame, a cover provided to cover one opening of the frame, and the other opening of the frame An electrical connection box characterized by including the other cover provided. A wire harness equipped with the electrical connection box according to claim 3 at a terminal and installed in a car.

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