JP2019088125A - Electrical connection box and wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box and a wire harness capable of improving a waterproof structure. A housing (3) constituting an electrical connection box (1) includes a frame (12) to which a plurality of electrical components are attached, and a lower cover (16) that covers a lower opening (15) of the frame (12). The frame 12 has a frame side seam 35 on the side covered by the lower cover 16. On the other hand, the lower cover 16 has a cover side seam 46 at the end of the cover peripheral wall 44. The frame side seam 35 is formed into a concave seam, and the cover side seam 46 is formed into a convex seam. The frame side seam 35 and the cover side seam 46 have walls facing each other by inserting a protrusion into the concave portion, and among the facing walls, at least the convex side wall has a wall thickness direction. One or more recesses 51 are formed. The recess 51 is arranged and formed in a portion where water can flow in the extending direction of each seam, and functions as a portion for alleviating the momentum of the flowing water. [Selection diagram] FIG. 5

Description

  The present invention relates to an electrical connection box mounted on a motor vehicle. The present invention also relates to a wire harness provided with the electrical connection box and wired in a car.

  An electrical connection box mounted on a vehicle includes an electrical block and a housing for housing the electrical block. 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 includes a frame (housing main body) in which the electric block is assembled and fixed, an upper cover which covers the upper opening of this frame (an opening of a portion facing the electric component), and a lower cover which covers the lower opening of the frame It comprises and is constituted.

  In the electric connection box, when the upper opening and the lower opening of the frame are covered with the upper cover and the lower cover, respectively, the joint of each cover and the joint of the frame are engaged to form a waterproof structure against moisture from the outside ( For example, refer to the following patent document 1). The waterproof structure is formed by engaging the joints and facing each other with a minute gap as if the walls of the joints were in contact with each other. Therefore, the moisture does not reach the inside of the electrical connection box to the extent that the moisture is applied from the outside of the electrical connection box.

JP, 2010-130705, A

  In the above-mentioned prior art, for example, when water is strongly applied to the joint portion of the frame joint and the lower cover joint by high-pressure cleaning, there is a possibility that the water may enter the minute gap, and the water extends the joint. If it flows in the existing direction, it is feared that water will blow out to the side near the inside of the electrical connection box by the force of the flow. The inventor of the present application believes that there is room for improvement in the waterproof structure.

  This invention is made in view of the above-mentioned situation, and makes it a subject to provide the electric connection box and wire harness which can improve a waterproof structure more.

  The electrical connection box of the present invention according to claim 1 made to solve the above-mentioned problems comprises a housing for housing a plurality of electric components, and the housing is a mounting destination of the plurality of electric components. And an outer peripheral wall formed by connecting a plurality of outer walls in a circumferential direction of the frame, and a predetermined space inside the outer peripheral wall. And an inner peripheral wall formed by connecting a plurality of inner walls in a row, and a concave frame side joint formed of an end of the outer peripheral wall and an end of the inner peripheral wall, the lower cover being The cover has a bottom wall shaped to match the lower opening and a cover peripheral wall formed by connecting a plurality of side walls continuously, and the cover peripheral wall has a convex cover side joint inserted into the frame side joint. , The cover side seam is a seam book And an opposing portion facing the end of the outer peripheral wall by insertion into the frame side joint, the outer surface of the joint main body and / or the inner surface of the outer peripheral wall being recessed in the wall thickness direction It is characterized by having a recessed part formed.

  According to the present invention having the features of the first aspect of the invention, moisture is applied from the outside of the electrical connection box under strong pressure around the engaging portions of the frame seam and the lower cover seam, When it flows into the minute gap of and flows in the extension direction of the joint, the force of the flow is relaxed by the recess. Specifically, water that has entered the minute gap and flowed in the extension direction of the joint reaches the recess from the minute gap and enters the portion where the cross-sectional area of the flow path has suddenly increased. In the recess, the pressure of moisture is reduced. That is, the momentum of the flowing water is alleviated. When the force is relaxed, the force to enter the next minute gap is weakened, and as a result, the flow of water to the side closer to the inside of the electrical connection box is suppressed. In the present invention, it is effective to have only one concave portion, and if a plurality of concave portions are formed, the momentum of the water can be greatly reduced.

  According to a second aspect of the present invention, in the electrical connection box according to the first aspect, the recess is disposed in the vicinity of a wall corner portion which is a continuous portion of the plurality of outer walls and a continuous portion of the plurality of side walls. It is characterized by being.

  According to the present invention having the features of the second aspect of the invention, since the momentum of the water is weakened by the recess, there is no problem even if it flows into the corner of the wall where the water tends to stagnate.

  The wire harness of the present invention according to claim 3 made to solve the above problems is characterized in that the terminal is provided with the electric connection box according to claim 1 or 2 and is arranged in a car. Do.

  According to the present invention having the features of claim 3 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 electrical connection box of the present invention, it is possible to improve the waterproof structure. 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 the 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 an enlarged view of the part shown by arrow H of FIG. It is the FF sectional view taken on the line of FIG. It is the BB sectional drawing of FIG. It is the CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. FIG. 6 is a view when FIG. 5 is viewed obliquely from above. It is a perspective view when making it a cross section in the position of the GG line | wire of FIG.

  The electrical connection box includes a housing for housing a plurality of electrical components. This housing is configured to include a frame to which a plurality of electrical components are attached and a cover that covers the opening of the frame. The frame has a frame side seam on the side covered by the cover. On the other hand, the cover has a cover side joint at the end of the cover peripheral wall. One of the frame side seam and the cover side seam is formed into a concave seam, and the other is formed into a convex seam. The frame-side joint and the cover-side joint have opposite walls due to the insertion of a convex to a concave, and at least the convex side of the opposing walls is a concave recessed in the thickness direction of the wall One or more are formed. The recess is disposed in a portion where water can flow in the extension direction of each joint, and functions as a portion for reducing the momentum of the flowing water.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the electrical connection box of the present invention. 2 is a plan view of the electrical connection box, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, FIG. 4 is an enlarged view of a portion indicated by arrow H in FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 4, FIG. 7 is a cross-sectional view taken along the line C-C in FIG. 4, FIG. 8 is a cross-sectional view taken along the line D-D in FIG. FIG. 10 is a cross-sectional view taken along line E, FIG. 10 is a view when FIG. 5 is viewed obliquely from above, and FIG. 11 is a perspective view when the cross section is taken at the position of line G-G in FIG.

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, as the relay 4 is assembled to the resin relay assembly portion 5, the fuses 6, 7, 8 are provided as members assembled to the resin fuse assembly portions 9, 10, 11 (electric block The configuration of 2 is an example).

  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>
1 to 6, the housing 3 is made of insulating resin, and the frame 12 to which the electric block 2 is detachably assembled, an upper cover 14 covering the upper opening 13 of the frame 12, and the frame And a lower cover 16 that covers the lower openings 15 of the lower 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 (opening) is an opening including the outer wall end 32 of the outer peripheral wall 22 and the inner wall end 42 of the inner peripheral wall 23 described later. The lower opening 15 is an opening opposite to the upper opening 13, that is, a lower opening.

<About frame 12>
In FIG. 1 and FIG. 11, 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 the frame 12 is provided with locking portions 24 and 25 for the upper cover 14, a pair of locking claws 26 for the upper cover 14, and a locking portion 27 for the lower cover 16. Further, the outer peripheral wall 22 is provided with a pair of locking protection portions 28 in accordance with the locking claws 26. Furthermore, the fixed legs 17 and 18 are provided on the outer peripheral wall 22. On the other hand, on the inner side of the inner circumferential wall 23, an assembling portion 29 to which the electric block 2 is to be assembled is formed. The assembling portion 29 is formed in accordance with the shape of the cassette type electric block 2. Since the frame 12 has the outer peripheral wall 22 and the inner peripheral wall 23, the portions of the outer peripheral wall 22 and the inner peripheral wall 23 are formed to have a double wall structure 30.

<On the double wall structure 30>
In FIG. 3, FIG. 6 and FIG. 11, the double wall structure 30 has an outer peripheral wall 22, an inner peripheral wall 23, a plurality of connecting ribs 31 connecting the outer peripheral wall 22 and the inner peripheral wall 23, and an outer peripheral wall 22. And a gap 32 defined by a plurality of connection ribs 31 between the inner peripheral walls 23. Further, the double-walled structure 30 further includes a frame side joint 35 configured by the lower end 33 of the outer peripheral wall 22 and the lower end 34 of the inner peripheral wall 23. The lower end 33 of the outer peripheral wall 22 where the frame side joint 35 is formed and the lower end 34 of the inner peripheral wall 23 are disposed at the same height position.

<About the outer peripheral wall 22 and the inner peripheral wall 23>
1, 3 and 5, the outer peripheral wall 22 is formed in a substantially frame shape by connecting a plurality of outer walls 22 a, 22 b... In the circumferential direction of the frame 12. The inner peripheral wall 23 is disposed inside the outer peripheral wall 22 at a predetermined interval (interval according to the connection rib 31 and the gap 32 in FIG. 11). The inner peripheral wall 23 is formed by connecting a plurality of inner walls 23a, 23b, ... in the circumferential direction of the frame 12. The portion denoted by reference numeral 36 in FIG. 5 indicates a continuous portion. The continuous portion 36 is formed as a portion in which one circumferential end of the inner circumferential wall 23 is continuous with the outer circumferential wall 22.

<About the frame side joint 35>
In FIG. 3, FIG. 5 and FIG. 6, the frame side joint 35 is formed in a concave portion into which the cover side joint 46 described later is inserted in a state where the lower cover 16 is attached to the frame 12. The frame side joint 35 is formed in such a size that the gap 37 is generated even when the cover side joint 46 is inserted (in other words, the cover side joint 46 is formed in such a size that the gap 37 is generated) ). Reference numeral 38 in the frame side joint 35 indicates the inner surface of the outer peripheral wall 22 (the inner surface of the outer wall 22a). The frame side seam 35 forms a waterproof structure 39 with a cover side seam 46 described later.

<About upper cover 14>
In FIG. 1 to FIG. 3, the upper cover 14 has a body wall 40 shaped to match the upper opening 13 and a cover peripheral wall 41 with a low height, and is formed into a shallow bottom and lid-shaped member. The cover peripheral wall 41 is formed by connecting a plurality of side walls 41a, 41b. Such upper cover 14 is provided with lock portions 57, 58 for the lock portions 24, 25 of the frame 12. Further, on the upper cover 14 (side wall 41 a), a pair of locking portions 42 for the pair of locking claws 26 of the frame 12 is formed. The main body wall 40 is the highest wall of the walls constituting the housing 3 and therefore may be called a ceiling wall.

<About lower cover 16>
In FIGS. 1, 3 and 4, the lower cover 16 has a bottom wall 43 and a cover peripheral wall 44 with a low height, and is formed into a lid-shaped member. The cover peripheral wall 44 is formed by connecting a plurality of side walls 44a, 44b. A plurality of lock portions 45 on the cover side with respect to the lock portions 27 of the frame 12 are formed in the lower cover 16 as described above. Further, the lower cover 16 is formed with a convex cover side joint 46 which is inserted into the concave frame side joint 35. Furthermore, a fixed leg 19 is formed on the lower cover 16. Besides the above, although not particularly shown, the lower cover 16 is formed with a discharge port for discharging the water etc. dropped through the double wall structure 30 to the outside of the electric connection box 1.

<About the lock portion 45>
In FIG. 4, FIG. 7 and FIG. 8, the lock portion 45 has a flexible arm portion 47 and a locking convex portion 48 formed at the tip of the arm portion 47, and has a shape shown in the figure. It is formed. In the lock portion 45, a base end portion of the arm portion 47 is coupled to an opposing portion 50 described later. The lock portion 45 is formed to project upward from the facing portion 50.

<About cover side joint 46>
In FIGS. 5 to 11, the cover-side joint 46 has a convex joint body 49 inserted into the concave frame-side joint 35 and the outer wall 22 of the outer peripheral wall 22 when the joint body 49 is inserted into the frame-side joint 35. It has an opposing portion 50 opposite to the lower end portion 33 and is formed in the illustrated shape (both the opposing state in which a gap is generated in "opposite" and the opposing state in contact and contact) Shall be included. The joint body 49 is formed in a wall-like portion that extends upward. A plurality of recesses 51 recessed in the thickness direction of the wall are formed and arranged in the extension direction of the cover side joint 46 on the outer surface of the joint main body 49 (the number may be one, and may be appropriately set) To do).

<About the recess 51>
In FIGS. 5, 6, 8, 10, and 11, three recesses 51 are formed in the vicinity of the wall corner 52 (the arrangement is an example). The recessed portion 51 covers the minute gap 53 between the outer surface 56 of the joint main body 49 (the outer surface 56 of the side wall 44a) and the inner surface 38 of the outer peripheral wall 22 (the inner surface 38 of the outer wall 22a). When it flows along the extension direction of the joint 46 and the frame side joint 35, it is formed as a part for reducing the flow momentum (in other words, as a part for reducing the flow momentum) It is formed). One or more such concave portions 51 are formed at places where it is desired to reduce the momentum of the flowing water. In addition, the width dimension W of the recessed part 51 shall be set suitably. In the present embodiment, the recess 51 is disposed and formed on the outer surface 56 of the joint main body 49, but not limited to this, only on the inner surface 38 of the outer peripheral wall 22 or on both the outer surface 56 of the joint main body 49 and the inner surface 38 It may be arranged and formed (not shown). Here, assuming that the minute gap 53 is a flow path (passage) to moisture, the concave portion 51 is formed as a portion for rapidly increasing the cross-sectional area of the flow path (formed as a portion for rapidly increasing the passage width) ).

<About the facing portion 50 and the waterproof structure 39>
6 and 9, the opposing portion 50 is a rib shape extending in the circumferential direction of the cover peripheral wall 44 at a portion projecting outward short from the outer surface of the cover peripheral wall 44 (the outer surface of the proximal end portion of the joint main body 49). Is formed in the part of The waterproof structure 39 is formed by the lower end portion 33 of the outer peripheral wall 22 facing the facing portion 50. In addition, the waterproof structure 39 is also formed by covering the opposing portion between the end 33 and the opposing portion 50 with the hood portion 54 continuous to the outer surface of the outer peripheral wall 22 and extending downward. Incidentally, when water is applied under strong pressure from the diagonally downward indicated by the arrow in FIG. 6 and the water enters from the opposite portion into the inside, there is a risk that the water may flow into the minute gap 53 thereafter. (This point does not matter because the recess 51 exists).

<About the mounting structure of lower cover 16>
In FIGS. 1 and 9, the lower cover 16 is moved upward so as to cover the lower opening 15 of the frame 12, and the lock portion 27 of the frame 12 and the lock portion 45 of the lower cover 16 are engaged at a plurality of locations. Installation of 16 is complete. When the attachment is completed, a locking state 55 of the lower cover 16 with respect to the frame 12 is formed. At this time, since the lower end portion 33 of the outer peripheral wall 22 faces the facing portion 50 and the facing portion is covered with the hood portion 54, a waterproof structure 39 is also formed.

<About the case where moisture infiltrates and flows through the minute gap 53>
In FIGS. 5 to 11, from the outside of the electrical connection box 1, the pressure is high from the outside and engaged with the engagement portions of the frame side joint 35 of the frame 12 and the cover side joint 46 of the lower cover 16 (diagonally downward shown by the arrow in FIG. When the water gets into the minute gap 53 between the joint walls and flows in the extension direction of the joint, the force of the flow is caused by the plurality of recesses 51 (51a to 51c). Be loosened. Specifically, the moisture that has entered the minute gap 53 (53a) and has flowed in the extension direction of the joint reaches the first recess 51 (51a) from the minute gap 53 (53a). Then, the cross-sectional area of the flow path is in a state where the cross-sectional area of the flow path suddenly increases, so that the pressure of water is first weakened in the first recess 51 (51a). That is, the momentum of the flowing water is alleviated. When the force is relaxed, the force to enter the next minute gap 53 (53b) is weakened, and the force of the flowing water is further reduced in the second recess 51 (51b). Then, the force to enter the next minute gap 53 (53c) is further weakened, so that the momentum of the flowing water is further relaxed in the third concave portion 51 (51c). As a result, in the wall corner 52 and the continuous part 36 where the water tends to stay, the momentum of the flowing water is relaxed to a sufficiently low state, and as a result, the water does not blow out.

<About the effect of electrical connection box 1>
As described above with reference to FIGS. 1 to 11, according to the electrical connection box 1 of the embodiment of the present invention, moisture enters the minute gap 53 between the joint walls and the joint is formed. Even in the case of flowing in the extending direction, since the momentum of the flowing water can be relaxed, as a result, it is possible to suppress the blowout of the water. As a result, the waterproof structure can be improved.

  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 Portions 12 Frames 13 Upper openings 14 Upper covers 15 Lower openings 16 Lower covers 17, 18, 19 Fixing legs 20 Insertion holes 21 Terminal accommodation space 22 Outer peripheral wall , 23 ... inner circumferential wall 24, 25 ... lock part, 26 ... locking claw, 27 ... lock part, 28 ... locking protection part, 29 ... assembly part, 30 ... double wall structure, 31 ... connection rib, 32 ... Gaps 33, 34: Ends 35: Frame side seams 36: Continuous parts 37: Gaps 38: Inner surfaces 39: Waterproof structure 40: Body wall 41: Cover peripheral wall 42: Locking part 43 Bottom wall, 44: Cover peripheral wall, 45: Lock portion, 46: Cover side joint, 47: Arm portion, 48: Locking convex portion, 49: Joint main body, 50: Opposite portion, 51: Concave portion, 52: Wall corner portion , 53: Clearance, 54: Hood, 55: Locked state, 56: Outer surface, 57, 58: Lock

Claims (3)

It has an enclosure for housing multiple electrical components,
The housing includes a frame to which the plurality of electrical components are attached, and a lower cover that covers a lower opening of the frame.
The frame includes an outer peripheral wall formed by connecting a plurality of outer walls in a circumferential direction of the frame, and an inner peripheral wall which is disposed at a predetermined interval inside the outer peripheral wall and is formed by connecting a plurality of inner walls continuously. And a concave frame-side joint constituted by an end of the outer peripheral wall and an end of the inner peripheral wall,
The lower cover has a bottom wall shaped to match the lower opening, and a cover peripheral wall formed by connecting a plurality of side walls continuously.
The cover peripheral wall has a convex cover side joint inserted into the frame side joint,
The cover-side joint has a joint body and a facing portion facing the end of the outer peripheral wall by insertion into the frame-side joint,
An electric connection box characterized by having a recess formed in the wall thickness direction on the outer surface of the joint body and / or the inner surface of the outer peripheral wall. In the electrical connection box according to claim 1,
The electrical connection box according to claim 1, wherein the recess is disposed in the vicinity of a wall corner which is a continuous portion of the plurality of outer walls and a continuous portion of the plurality of side walls. A wire harness equipped with the electrical connection box according to claim 1 or 2 at a terminal and installed in a car.

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