Electrical junction box

Abstract

To provide an electric connection box capable of exhausting water to outside of a box.SOLUTION: An electric connection box 1 comprises: a box main body 2 that includes a plate-like main body fixing part 20 that is fixed to a first surface 100a of a panel 100 having a penetration hole, a cylinder-like holding part 21 that is inserted into the penetration hole, and a frame-like rib 22 that projects from the main body fixing part; an annular packing 4 that is placed between the main body fixing part and the first surface, and surrounds the penetration hole, and seals a space between the main body fixing part and the first surface; and a cover 3 that is fixed to a second surface 100b of the panel and is fitted with the holding part. The rib extends along an edge of the penetration hole, and positions an edge at an inner side in the packing. In the rib, a notch 22d is provided. In the box main body, the notch is attached to the panel so as to be positioned at a lower end of the penetration hole. The cover includes an exhaust groove 37 that is concaved so as to be far from the second surface. The exhaust groove extends toward a lower direction that is opposite to the notch.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to an electrical connection box.

Background Art

[0002] Conventionally, there is an electrical connection box having a structure for discharging water. In Patent Document 1, a wiring board in which an insulating substrate and a bus bar provided with waterproof ribs continuously along the side peripheral edge are alternately laminated and assembled is housed therein, and an electrical connection box attached in a vertical state to a mounting member in an engine room is disclosed. A plurality of drain passages are formed by partially cutting out the waterproof ribs located at the lower end of the insulating substrate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an electrical connection box fixed to a panel, an annular packing may be sandwiched between the box and the panel. In such an electrical connection box, it is desired that water can be discharged to the outside of the box.

[0005] An object of the present invention is to provide an electrical connection box capable of discharging water to the outside of the box.

Means for Solving the Problems

[0006] The electrical junction box of the present invention comprises a box body having a plate-shaped main body fixing portion fixed to a first surface of a panel having a through hole, a cylindrical holding portion inserted into the through hole, and a frame-shaped rib protruding from the main body fixing portion; an annular packing disposed between the main body fixing portion and the first surface, surrounding the through hole and sealing the space between the main body fixing portion and the first surface; and a cover fixed to a second surface of the panel and fitted with the holding portion, wherein the rib extends along the edge of the through hole and positions the inner edge of the packing, the rib is provided with a notch, the box body is attached to the panel such that the notch is located at the lower end of the through hole, and the cover has a recessed drainage groove that is set away from the second surface, the drainage groove extending downward from a position opposite the notch. [Effects of the Invention]

[0007] In the electrical junction box according to the present invention, the box body is attached to the panel such that the rib notches are located at the lower end of the through-holes in the panel. The cover has a recessed drainage groove that is set away from the second surface of the panel, and the drainage groove extends downward from a position opposite the notches. The electrical junction box according to the present invention has the effect of being able to discharge water inside the box to the outside through the notches and drainage grooves. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the electrical junction box of the embodiment. [Figure 2] Figure 2 is an exploded perspective view of the electrical junction box of the embodiment. [Figure 3] Figure 3 is a perspective view of the box body of the embodiment. [Figure 4] Figure 4 is a front view of the box body of the embodiment. [Figure 5] Figure 5 is a perspective view of the grommet of the embodiment. [Figure 6] Figure 6 is a plan view of the cover of the embodiment. [Figure 7]Figure 7 is a perspective view of the cover of the embodiment. [Figure 8] Figure 8 is a perspective view of the cover of the embodiment. [Figure 9] Figure 9 is a perspective view of the box body with the packing attached. [Figure 10] Figure 10 is a perspective view illustrating the attachment of the cover in the embodiment. [Figure 11] Figure 11 is a cross-sectional view of the electrical junction box of the embodiment. [Figure 12] Figure 12 is a cross-sectional view of the electrical junction box of the embodiment. [Figure 13] Figure 13 is a cross-sectional view of the electrical junction box of the embodiment. [Modes for carrying out the invention]

[0009] An electrical junction box according to an embodiment of the present invention will be described in detail below with reference to the drawings. However, this embodiment does not limit the present invention. Furthermore, the components in the following embodiments include those that are easily conceivable by those skilled in the art or that are substantially identical.

[0010] [Embodiment] An embodiment will be described with reference to Figures 1 to 13. This embodiment relates to an electrical junction box. Figure 1 is a perspective view of the electrical junction box of the embodiment, Figure 2 is an exploded perspective view of the electrical junction box of the embodiment, Figure 3 is a perspective view of the box body of the embodiment, Figure 4 is a front view of the box body of the embodiment, Figure 5 is a perspective view of the grommet of the embodiment, Figure 6 is a plan view of the cover of the embodiment, Figures 7 and 8 are perspective views of the cover of the embodiment, Figure 9 is a perspective view of the box body with the packing attached, and Figure 10 is a perspective view illustrating the attachment of the cover of the embodiment. Figures 11 to 13 are cross-sectional views of the electrical junction box of the embodiment.

[0011] Figures 11 and 12 show the XI-XI section of Figure 1. Figure 13 shows the XIII-XIII section of Figure 11.

[0012] As shown in FIGS. 1 and 2, the electrical connection box 1 of the present embodiment includes a box body 2, a cover 3, a packing 4, and a grommet 5. The electrical connection box 1 is fixed to a panel 100. The panel 100 is, for example, a metal panel mounted on a vehicle such as an automobile. The panel 100 is, for example, a dash panel that partitions an engine room and a passenger compartment. The panel 100 extends along the vehicle vertical direction V. As shown in FIG. 2, a through hole 110 is provided in the panel 100. The through hole 110 penetrates the panel 100 along the thickness direction of the panel 100.

[0013] In the following description, the thickness direction of the panel 100 is referred to as the "first direction X". The panel 100 has a first surface 100a and a second surface 100b. The first surface 100a and the second surface 100b are main surfaces of the panel 100. The shape of the through hole 110 of the present embodiment is rectangular. The through hole 110 has a first edge 110a, a second edge 110b, and a pair of third edges 110c.

[0014] The first edge 110a and the second edge 110b extend in the second direction Y, and the third edge 110c extends in the third direction Z. The third direction Z is a direction along the main surface and corresponds to the vehicle vertical direction V. The second direction Y is a direction along the main surface and is perpendicular to the third direction Z. The second direction Y is, for example, the vehicle width direction. The third direction Z may coincide with the vehicle vertical direction V. The first edge 110a is the upper edge of the through hole 110. The second edge 110b is the lower edge of the through hole 110.

[0015] A plurality of insertion holes 120 are provided in the panel 100. The insertion hole 120 is a hole into which the male screw portion 23 of the box body 2 is inserted. The insertion hole 120 penetrates the panel 100. Four insertion holes 120 are arranged in the illustrated panel 100. Each insertion hole 120 is arranged near each corner of the through hole 110.

[0016] The electrical connection box 1 of the present embodiment is fixed to the panel 100 while sandwiching the panel 100 by the box body 2 and the cover 3. The box body 2 is fixed to the first surface 100a of the panel 100. The cover 3 is fixed to the second surface 100b of the panel 100.

[0017] The box body 2 has a main body fixing portion 20, a holding portion 21, and a frame-shaped rib 22. The box body 2 is formed of, for example, an insulating synthetic resin. The main body fixing portion 20 is fixed to the first surface 100a of the panel 100. The main body fixing portion 20 is plate-shaped and has a shape corresponding to the through hole 110 of the panel 100. The illustrated shape of the main body fixing portion 20 is rectangular. The main body fixing portion 20 holds a plurality of male screw portions 23 corresponding to the insertion holes 120. The male screw portions 23 are arranged at the four corners of the main body fixing portion 20.

[0018] The holding portion 21 has a cylindrical shape and holds components. The holding portion 21 may hold electrical components such as connectors, may hold electronic components such as relays, or may hold other components. The shape of the holding portion 21 of the present embodiment is a square tube shape. As shown in FIG. 2, the holding portion 21 protrudes from both sides of the main body fixing portion 20 in the first direction X.

[0019] As shown in FIG. 3, the holding portion 21 has a pair of first side wall portions 21a extending in the second direction Y and a pair of second side wall portions 21b extending in the third direction Z. A plurality of partition walls 21c and a plurality of engaging portions 21d are arranged in the space surrounded by the holding portion 21. The partition walls 21c partition the internal space of the holding portion 21 into a plurality of accommodating portions. The engaging portion 21d engages with the components accommodated in the holding portion 21 to hold the components.

[0020] The holding portion 21 is provided with a recess 24 for holding the grommet 5. The recess

[0021] The component housed in the holding section 21 is connected to an electric wire. The electric wire is inserted through the grommet 5 and pulled out into the external space. The component housed in the holding section 21 is connected to a mating connector, etc.

[0022] As shown in Figure 3, the rib 22 protrudes in the first direction X from the opposing surface 20a of the main body fixing portion 20. The opposing surface 20a is the surface facing the first surface 100a of the panel 100. The opposing surface 20a also faces the cover 3. The rib 22 is a positioning rib for positioning the packing 4, which will be described later. The rib 22 also has the function of suppressing unevenness in the compression ratio of the packing 4. The rib 22 is formed in a frame shape along the edges 110a, 110b, and 110c of the through hole 110 of the panel 100. More specifically, the rib 22 has a first extending portion 22a, a second extending portion 22b, and a third extending portion 22c.

[0023] The first extension portion 22a and the second extension portion 22b are straight sections that run along the first edge portion 110a and the second edge portion 110b of the through hole 110. The ends of the first extension portion 22a and the second extension portion 22b are connected to the first side wall portion 21a of the holding portion 21. The first extension portion 22a corresponds to the upper first edge portion 110a of the through hole 110, and the second extension portion 22b corresponds to the lower second edge portion 110b. In other words, the box body 2 is attached to the panel 100 such that the first extension portion 22a faces the upper first edge portion 110a of the through hole 110, and the second extension portion 22b faces the lower second edge portion 110b.

[0024] The third extension portion 22c is a straight portion along the third edge portion 110c of the through hole 110. The third extension portion 22c extends parallel to the second side wall portion 21b of the holding portion 21. An arc-shaped curved portion 22e is provided at the connection between the first extension portion 22a and the second extension portion 22b and the third extension portion 22c.

[0025] The second extending portion 22b is provided with a notch 22d. The notch 22d divides the second extending portion 22b into two parts. The notch 22d is located at the lower end of the region enclosed by the rib 22 and the retaining portion 21. As will be described later, the notch 22d constitutes a drainage path for draining water from inside the electrical connection box 1.

[0026] The male thread portion 23 is positioned outside the retaining portion 21 and the rib 22. That is, the third extension portion 22c of the rib 22 and the retaining portion 21 are located closer to the center than the male thread portion 23 in the second direction Y. Also, the retaining portion 21, the first extension portion 22a, and the second extension portion 22b are located closer to the center than the male thread portion 23 in the third direction Z. The packing 4 is positioned in the region between the male thread portion 23 and the retaining portion 21, and in the region between the male thread portion 23 and the rib 22.

[0027] The main body fixing portion 20 has a plurality of locking portions 25 for locking the panel 100. The locking portions 25 protrude in a first direction X from the opposing surface 20a of the main body fixing portion 20. The plurality of locking portions 25 include two locking portions 25 arranged along the second side wall portion 21b of the holding portion 21, and two locking portions 25 arranged along the third extending portion 22c. The locking portions 25 have flexible claw portions 25a. The locking portions 25 are inserted into the through holes 110 of the panel 100 and lock the first surface 100a of the panel 100 with the claw portions 25a.

[0028] As shown in Figure 2, the packing 4 is a surface seal sandwiched between the first surface 100a of the panel 100 and the opposing surface 20a of the main body fixing part 20. The packing 4 surrounds the through hole 110 and restricts the ingress of water into the electrical connection box 1. The packing 4 is molded from a synthetic resin such as rubber. In plan view, the shape of the packing 4 is a rectangular frame. Insertion holes 4a into which the male screw portion 23 is inserted are provided at the four corners of the packing 4.

[0029] As shown in Figure 5, the grommet 5 has a pipe portion 51 and a flange portion 52. The grommet 5 is molded from a synthetic resin such as rubber. The pipe portion 51 is a cylindrical part through which a conductor such as an electric wire W is inserted. The illustrated shape of the pipe portion 51 is cylindrical. The flange portion 52 is located at the end of the pipe portion 51 and protrudes radially outward from the pipe portion 51.

[0030] The illustrated flange portion 52 has a roughly D-shape. More specifically, the flange portion 52 has a U-shaped curved portion 52a and a straight portion 52b. The curved portion 52a is the part that is inserted into the recess 24 of the retaining portion 21. The straight portion 52b is the part that is pressed by the cover 3. In other words, the flange portion 52 is sandwiched between the retaining portion 21 and the cover 3 and is held by the retaining portion 21 and the cover 3.

[0031] As shown in Figures 1 and 2, the cover 3 has a cover fixing portion 31 and a fitting portion 32. The cover 3 is molded from, for example, an insulating synthetic resin. The fitting portion 32 fits with the holding portion 21 of the box body 2 and closes the opening of the holding portion 21. The shape of the fitting portion 32 is a bottomed cylindrical shape. In plan view, the shape of the fitting portion 32 is rectangular.

[0032] The cover fixing portion 31 is fixed to the second surface 100b of the panel 100. As shown in Figure 6, the cover fixing portion 31 has a main portion 33 and a pair of extension portions 34. The main portion 33 surrounds the fitting portion 32 and protrudes from the fitting portion 32 in the second direction Y and the third direction Z. In plan view, the shape of the main portion 33 is a rectangular frame shape.

[0033] The extension portion 34 extends from the end of the main portion 33 in the third direction Z in the second direction Y. The illustrated shape of the extension portion 34 is rectangular. The length L1 of the extension portion 34 along the second direction Y is determined according to the position of the insertion hole 120 of the panel 100. In other words, the length L1 of the extension portion 34 is determined according to the width of the through hole 110 of the panel 100. The electrical junction box 1 of this embodiment can be attached to a through hole 110 having a large opening width, and the retaining portion 21 and the fitting portion 32 can be positioned at the end of the through hole 110.

[0034] As shown in Figure 7, the fitting portion 32 has a locking surface 32b and a recess 32c. The locking surface 32b locks the flange portion 52 of the grommet 5. The recess 32c holds the pipe portion 51 of the grommet 5. The locking surface 32b and the recess 32c are provided on the side wall portion 32a located on the side of the extension portion 34. The side wall portion 32a is a wall portion facing the second side wall portion 21b of the holding portion 21 and extends in the third direction Z.

[0035] The locking surface 32b is the inner wall surface of the side wall portion 32a and faces the second direction Y. The illustrated locking surface 32b is a plane perpendicular to the second direction Y. The illustrated side wall portion 32a has two recesses 32c aligned in the third direction Z. The recesses 32c combine with the recesses 24 of the holding portion 21 to form a circular passage for the pipe portion 51 to pass through. The shape of the recesses 32c when viewed from the second direction Y is approximately U-shaped. The recesses 32c are recessed toward the bottom wall of the fitting portion 32 along the first direction X.

[0036] A packing 6 is positioned inside the fitting portion 32. The packing 6 has an annular sealing portion 61 and a pressing portion 62. The sealing portion 61 is positioned along the inner wall surface of the fitting portion 32. The sealing portion 61 is in close contact with the tip surface of the retaining portion 21 and seals the space between the retaining portion 21 and the fitting portion 32.

[0037] The pressing portion 62 is positioned along the side wall portion 32a and extends in the third direction Z. The pressing portion 62 has a pressing surface 62a that presses against the grommet 5. The pressing surface 62a is in close contact with the side surface of the flange portion 52 of the grommet 5 facing the first direction X. The pressing portion 62 presses the flange portion 52 toward the holding portion 21 and holds the flange portion 52.

[0038] The cover 3 has four through holes 35 corresponding to the male threaded portion 23. The four through holes 35 are located at the vertices of the rectangle. Of the four through holes 35, two are located in the main portion 33, and the other two are located in the extension portion 34. The through holes 35 in the main portion 33 are located at the corners opposite to the extension portion 34. The through holes 35 in the extension portion 34 are located at the corners opposite to the main portion 33, in other words, at the tips in the extension direction. The two recesses 32c are located between the two extension portions 34. That is, the grommet 5 is located between the two extension portions 34.

[0039] The cover 3 is fixed to the panel 100 and the box body 2 by screwing a nut onto the male threaded portion 23 inserted through the through hole 35. Therefore, the fastening force F1 in the first direction X by the nut acts on the through hole 35. On the other hand, the fitting portion 32 is subjected to a reaction force F2 in the first direction X received from the grommet 5.

[0040] As described below, the cover 3 of this embodiment has reinforcing ribs 36 that suppress lifting and deformation of the fitting portion 32 due to the reaction force F2. As shown in Figures 6 and 8, the reinforcing ribs 36 have a first rib 36A and a second rib 36B. The reinforcing ribs 36 are provided at a position that supports the pressing portion 62 of the packing 6. In other words, the reinforcing ribs 36 are located on the back side of the pressing portion 62. The reinforcing ribs 36 also extend from one end to the other in the third direction Z of the cover fixing portion 31. Both ends of the reinforcing ribs 36 are provided with raised portions 38. The raised portions 38 are adjacent to the through hole 35 and rise in the first direction X. The raised portions 38 transmit the fastening force F1 to the reinforcing ribs 36, ensuring the pressing force against the grommet 5, and reinforcing the fitting portion 32 to suppress deformation of the fitting portion 32.

[0041] The first rib 36A and the second rib 36B are arranged side by side in the second direction Y. The first rib 36A is positioned closer to the fitting portion 32 than the second rib 36B. When viewed from the second direction Y, the shape of the first rib 36A and the second rib 36B is an arch shape that straddles the grommet 5. Both ends of the first rib 36A are provided with widened portions 36x that project in the third direction Z relative to the second rib 36B.

[0042] As shown in Figure 7, the cover 3 has a drainage channel 37. The drainage channel 37 is located at the boundary between the main part 33 and the extension part 34. The drainage channel 37 is provided on the opposing surface 3a of the cover 3. The opposing surface 3a is the surface that faces the opposing surface 20a of the box body 2 in the first direction X and also faces the second surface 100b of the panel 100. The drainage channel 37 extends upward in the third direction Z from the lower end 3b of the opposing surface 3a. The lower end 3b is the lower end when the electrical connection box 1 is attached to the panel 100. The drainage channel 37 has an outlet 37a that opens toward the space below the cover 3.

[0043] The opposing surface 3a has an opposing region 3c. The opposing region 3c is the region that faces the notch 22d provided in the rib 22 of the box body 2. The drainage groove 37 extends downward from the opposing region 3c. In other words, the upper part of the drainage groove 37 faces the notch 22d.

[0044] Figure 9 shows the packing 4 attached to the box body 2. The packing 4 is attached to the box body 2 so as to surround the retaining portion 21 and the four locking portions 25. The male threaded portions 23 of the box body 2 are each inserted into the insertion holes 4a of the packing 4. The retaining portion 21 and ribs 22 of the box body 2 position the packing 4.

[0045] More specifically, the first and second extended portions 22a and 22b of the rib 22 position the inner edges 41 and 42 of the packing 4. The inner edges 41 and 42 are linear edges extending in the second direction Y. The third extended portion 22c of the rib 22 positions the inner edge 43 of the packing 4. The inner edge 43 is a linear edge extending in the third direction Z. Therefore, the rib 22 positions the packing 4 in both the second direction Y and the third direction Z. The rib 22 can prevent a portion of the packing 4 from being overcompressed and suppress uneven compression in the packing 4.

[0046] The box body 2, with the packing 4 attached, is mounted to the panel 100 as shown in Figure 10. The retaining portion 21 is inserted into the through hole 110 of the panel 100 and protrudes from the second surface 100b. The male threaded portion 23 is inserted into the insertion hole 120 of the panel 100 and protrudes from the second surface 100b. Components such as connectors are attached to the retaining portion 21. The wires connected to the components are inserted through the grommet 5 and pulled out to the outside via the grommet 5.

[0047] The fitting portion 32 of the cover 3 is fitted into the holding portion 21 of the box body 2. The male threaded portion 23 is inserted into the through hole 35 of the cover fixing portion 31 and protrudes from the through hole 35. The cover 3 is fixed to the panel 100 and the box body 2 by nuts screwed onto each male threaded portion 23.

[0048] Figure 11 shows a panel 100 and a cover 3 fixed to the box body 2. The electrical junction box 1 is fixed to the panel 100 by sandwiching it between the body fixing portion 20 of the box body 2 and the cover fixing portion 31 of the cover 3. In the electrical junction box 1 of this embodiment, a portion of the opposing surface 20a of the box body 2 is exposed to the outside space. Therefore, as indicated by arrow AR1, water may enter the gap between the box body 2 and the cover 3. On the opposing surface 20a, the exposed portion is the area surrounded by the rib 22.

[0049] As shown in Figure 12, the electrical junction box 1 of this embodiment can discharge water that enters downwards. The ribs 22 of the box body 2 can catch water that enters the gaps. The water caught by the ribs 22 flows along the ribs 22 and enters the notch 22d. The drain groove 37 of the cover 3 is positioned opposite the notch 22d. Therefore, the water in the notch 22d is discharged through the drain groove 37, as indicated by arrow AR2. The drain groove 37 is recessed away from the second surface 100b. The drain groove 37 and the second surface 100b form a water discharge path. The outlet 37a of the drain groove 37 is open to the space below, allowing water to be discharged downwards. In this way, the electrical junction box 1 of this embodiment can discharge water to the outside without water accumulating inside the electrical junction box 1.

[0050] As shown in Figure 11, a fastening force F1 by nuts acts on both ends of the cover fixing portion 31 in the third direction Z. The cover 3 presses against the grommet 5 with the fastening force F1 and holds the grommet 5. At this time, the fitting portion 32 receives a reaction force F2 from the grommet 5. The reinforcing rib 36 of the cover 3 suppresses deformation of the fitting portion 32 due to the reaction force F2 and suppresses a decrease in the sealing performance of the packing 6.

[0051] As shown in Figure 13, the first rib 36A is positioned to support the pressing portion 62 of the packing 6. More specifically, the first rib 36A supports the end of the pressing portion 62 on the side of the pipe portion 51. The second rib 36B is positioned parallel to the first rib 36A in the second direction Y. The second rib 36B is positioned on the opposite side of the first rib 36A from the side of the fitting portion 32. In other words, the first rib 36A is positioned between the fitting portion 32 and the second rib 36B. The two ribs 36A and 36B can effectively suppress the deformation of the cover 3 due to the reaction force F2.

[0052] As described above, the electrical junction box 1 of this embodiment comprises a box body 2, an annular packing 4, and a cover 3. The box body 2 comprises a plate-shaped body fixing portion 20, a cylindrical holding portion 21, and a frame-shaped rib 22. The body fixing portion 20 is fixed to the first surface 100a of the panel 100 which has a through hole 110. The holding portion 21 is inserted into the through hole 110. The rib 22 protrudes from the body fixing portion 20. The packing 4 is positioned between the body fixing portion 20 and the first surface 100a, surrounding the through hole 110 and sealing the space between the body fixing portion 20 and the first surface 100a. The cover 3 is fixed to the second surface 100b of the panel 100 and fits with the holding portion 21.

[0053] The rib 22 extends along the edges 110a, 110b, and 110c of the through hole 110 and positions the inner edges 41, 42, and 43 of the packing 4. The rib 22 is provided with a notch 22d. The box body 2 is attached to the panel 100 such that the notch 22d is located at the lower end of the through hole 110. The cover 3 has a recessed drainage groove 37 that is set away from the second surface 100b. The drainage groove 37 extends downward from a position opposite the notch 22d. In this embodiment, if water enters the area surrounded by the rib 22, the electrical junction box 1 can be drained through the notch 22d and the drainage groove 37.

[0054] The electrical junction box 1 of this embodiment can flexibly accommodate changes in the size of the through-hole 110. For example, when the panel 100 is standardized across different vehicle models, the width of the through-hole 110 in the second direction Y may be increased. In the electrical junction box 1 of this embodiment, the widening of the through-hole 110 can be accommodated by expanding the packing 4 and the main body fixing part 20 while maintaining the size and position of the retaining part 21. Furthermore, the widening of the through-hole 110 can be accommodated by the extension part 34 while maintaining the size and position of the fitting part 32. Since the positions of the retaining part 21 and the fitting part 32 are maintained, the length of the wire harness connected to the component is also maintained, eliminating the need to redesign the wire harness.

[0055] In this case, the opposing surface 20a of the box body 2 may be exposed between the pair of extensions 34. For example, when the grommet 5 is sandwiched between the holding portion 21 and the fitting portion 32 as in this embodiment, it is difficult to cover the entire opposing surface 20a with the cover 3 while ensuring watertight performance. In the electrical connection box 1 of this embodiment, even if a part of the opposing surface 20a is exposed, water can be discharged to the outside by the notch 22d of the rib 22 and the drainage groove 37.

[0056] The electrical junction box 1 of this embodiment has a cylindrical grommet 5. The cover 3 has a fitting portion 32 and a plate-shaped cover fixing portion 31. The fitting portion 32 fits with the holding portion 21 to hold the grommet 5. The cover fixing portion 31 is fixed to the second surface 100b. The cover fixing portion 31 has a pair of extension portions 34 positioned at both ends of the cover fixing portion 31 with the grommet 5 in between. The extension portions 34 extend from the fitting portion 32 along the second direction Y, which is the extending direction of the grommet 5, and have through holes 35. In this embodiment, a male screw portion 23, which is an example of a fastening member, is inserted into the through hole 35.

[0057] The cover fixing portion 31 has reinforcing ribs 36 that reinforce the fitting portion 32. The reinforcing ribs 36 extend from one end to the other of the cover fixing portion 31 along the third direction Z, which is the direction in which the pair of extension portions 34 are aligned. The reinforcing ribs 36 can transmit the fastening force from the fastening member to the fitting portion 32 and suppress deformation of the fitting portion 32.

[0058] The reinforcing rib 36 in this embodiment includes a first rib 36A and a second rib 36B aligned in the third direction Z. The reinforcing rib 36 may have three or more ribs. The fitting portion 32 is appropriately reinforced by the arrangement of the first rib 36A and the second rib 36B side by side.

[0059] [Modified examples of embodiments] The shapes of the box body 2 and cover 3 are not limited to the examples provided. For example, the shape and arrangement of the extension 34 are not limited to the shapes and arrangements provided for in this embodiment. The number of grommets 5 held by the electrical connection box 1 is not limited to two.

[0060] The electrical junction box 1 does not necessarily have a grommet 5. In this case, the cover 3 may be formed to expose the opposing surface 20a of the box body 2, similar to the embodiment described above. This makes it possible to miniaturize and lighten the cover 3.

[0061] The embodiments and modifications disclosed above can be combined and implemented as appropriate. [Explanation of symbols]

[0062] 1: Electrical junction box, 2: Box body, 3: Cover, 4: Gasket, 5: Grommet 6: Gasket 20: Main body fixing part, 20a: Opposing surface 21: Holding part, 21a: First side wall part, 21b: Second side wall part 22: Rib, 22a: First extension part, 22b: Second extension part, 22c: Third extension part 23: Male threaded portion, 24: Recessed portion, 25: Locking portion 31: Cover fixing part 32: Fitting portion, 32a: Side wall portion, 32b: Locking surface, 32c: Recess 33: Main part, 34: Extension part, 35: Through hole 36: Reinforcement rib, 36A: First rib, 36B: Second rib 37: Drain, 37a: Outlet, 38: Ridge 41, 42, 43: Inner edge 51: Pipe section, 52: Flange section 61: Seal part, 62: Pressing part 100: Panel, 100a: First side, 100b: Second side 110: Through hole, 110a: First edge, 110b: Second edge 110c: Third edge 120: Insertion hole F1: fastening force, F2: reaction force X: first direction, Y: second direction, Z: third direction

Claims

1. A box body having a plate-shaped main body fixing portion fixed to the first surface of a panel having a through hole, a cylindrical holding portion inserted into the through hole, and a frame-shaped rib protruding from the main body fixing portion, An annular packing is disposed between the main body fixing portion and the first surface, surrounding the through hole and sealing the space between the main body fixing portion and the first surface. A cover fixed to the second surface of the panel and fitted with the retaining part, Equipped with, The rib extends along the edge of the through hole and positions the inner edge of the packing. The aforementioned rib is provided with a notch, The box body is attached to the panel such that the notch is located at the lower end of the through hole. The cover has a drainage groove recessed away from the second surface, and the drainage groove extends downward from a position opposite the notch. An electrical junction box characterized by the following features.

2. Furthermore, it is equipped with a cylindrical grommet, The cover has a fitting portion that fits with the holding portion to hold the grommet, and a plate-shaped cover fixing portion that is fixed to the second surface. The cover fixing portion has a pair of extensions positioned at both ends of the cover fixing portion with the grommet in between, The extension extends from the fitting portion along the extending direction of the grommet and has a through hole into which a fastening member is inserted. The cover fixing portion has reinforcing ribs that reinforce the fitting portion, and the reinforcing ribs extend from one end to the other end of the cover fixing portion along the direction in which the pair of extension portions are aligned. The electrical junction box according to claim 1.

3. The reinforcing ribs include a first rib and a second rib aligned in the direction of extension of the grommet. The electrical junction box according to claim 2.

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