JP2021151042A - Electric connection box - Google Patents

Abstract

To provide an electric connection box capable of suppressing immersion of a powder-like foreign material into a fitting groove.SOLUTION: An electric connection box 1 comprises: a lower case 10 including an open part O and a lower marginal part 13; an upper case 20 blocking the open part O of the lower case 10, and including an upper marginal part 23 combined with the lower marginal part 13; and a rubber ring member 30 fitted into a fitting groove 50 formed in the lower marginal part 13. A sealing marginal part 2 sealing so as to combine the lower marginal part 13 and the upper marginal part 23 is structured, and a bolt 40 penetrating the upper marginal part 23 and fastening a cylinder hole part 15 of the sealing marginal part 2 is provided. An inside immersion suppression part 60 that suppresses immersion of a powder-like foreign material to a contact portion of the lower marginal part 13 and the upper marginal part 23, and the ring member 30 is provided between the cylindrical hole part 15 and the fitting groove 50.SELECTED DRAWING: Figure 4

Description

The present invention relates to, for example, an electrical junction box provided with a ring member for preventing water from entering the interior.

Generally, an electronic component such as a fuse and a circuit board on which an electronic control circuit is mounted are housed inside an electric junction box mounted on a vehicle. For this reason, the electrical junction box is provided with a waterproof structure to prevent water from entering the inside.

As an example of such an electric connection box, Patent Document 1 discloses an electric connection box composed of a case body having a case edge provided with a fitting groove for fitting a rubber ring member functioning as a gasket. ing. This electrical connection box is configured by assembling the cover body to the case body so that the ring member fitted in the fitting groove is sandwiched between the cover edge portion and the case edge portion of the cover body.

With the electrical junction box configured in this way, even if water invades through the gap between the case body and the cover body, the ring member can prevent water from invading the inside, and the circuit board housed inside can be used. It is said that it can be protected from inundation.

However, dust such as sand and dust, and powdery foreign matter generated by friction and chemical changes between the case body and the cover body and the bolt enter the fitting groove through the gap between the cover edge and the case edge. It is conceivable to do. Then, these powdery foreign substances that have entered the fitting groove may damage or deteriorate the ring member, for example, and may reduce the water stopping property of the ring member.

Japanese Unexamined Patent Publication No. 2000-161496

In view of the above-mentioned problems, it is an object of the present invention to provide an electrical connection box capable of suppressing the intrusion of powdery foreign matter into the fitting groove.

According to the present invention, a case body having an opening and an opening edge, a cover body having a cover edge that closes the opening of the case body and is fitted with the opening edge, and a fitting formed in the opening edge. A rubber ring member to be fitted into the insertion groove is provided, and the opening edge portion and the cover edge portion are combined to form a sealing edge portion for sealing, and the cover edge portion is penetrated to form the sealing edge portion. A fastening material for fastening the fastening portion of the sealing edge portion is provided, and a foreign matter intrusion suppressing portion that suppresses the intrusion of powdery foreign matter into the contact portion between the opening edge portion and the cover edge portion and the ring member is provided. , An electrical connection box provided between the fastening portion and the fitting groove.

The case body and the cover body include those made of metal or resin. When the case body and the cover body are made of metal, the fastening material contains the same kind of metal or a dissimilar metal.
The powdery foreign substance refers to a powdery substance or a powder or granular material that can enter from the sealing edge. For example, abrasion powder generated by friction between the fastening material and the case body and the cover body, powder particles generated by the difference in material between the fastening material and the case body and the cover body, sand and dust invading from the outside of the electrical junction box, etc. Includes dust and the like.

The foreign matter intrusion suppressing portion may be any as long as it can suppress the intrusion of powdery foreign matter into the contact portion between the opening edge portion and the cover edge portion and the ring member. For example, a groove or step structure provided between the fastening portion and the fitting groove, a groove provided in the fitting groove, a rough surface portion or an adhesive portion provided between the case body and the cover body, etc. Including different members and different configurations.

According to the present invention, the foreign matter intrusion suppressing portion provided between the fastening portion and the fitting groove can suppress the intrusion of powdery foreign matter into the fitting groove side. Therefore, it is possible to prevent the powdery foreign matter from interfering with the ring member and deteriorating the ring member, and it is possible to maintain the water stopping property.

As an aspect of the present invention, the distance between the fastening portion and the fitting groove in the opening edge portion in the box inside / outside direction may be wider than the wall thickness of the case body.
The above-mentioned wall thickness of the case body is a normal wall thickness of the case body, and as a specific example, when the average value of the wall thickness of the case body or a part of the case body is extremely thickened. It refers to the wall thickness of the part excluding that part.

According to the present invention, since the distance between the fastening portion and the fitting groove in the inner and outer directions of the box is wider than the wall thickness, the distance from the fastening portion to the contact portion between the opening edge portion and the cover edge portion and the ring member is increased. can do. Therefore, even if powdery foreign matter invades between the fastening portion and the fitting groove, the powdery foreign matter invades the contact portion between the opening edge portion and the cover edge portion and the ring member. Can be suppressed.

In addition, since the distance between the fastening point and the fitting groove at the opening edge in the box inside / outside direction is wider than the wall thickness of the case body, it is easy to surely provide a foreign matter intrusion suppression portion along the box inside / outside direction, and a plurality of foreign matters. An intrusion suppression unit can also be provided. Therefore, it is possible to further suppress the invasion of powdery foreign matter into the contact points between the opening edge portion and the cover edge portion and the ring member.

Further, as an aspect of the present invention, the distance between the fastening portion at the opening edge portion and the fitting groove in the box inside / outside direction is the box inside / outside direction between the fastening portion at the opening edge portion and the outer surface of the opening edge portion. It may be wider than the interval between.
According to the present invention, since the distance between the fastening portion and the fitting groove in the opening edge portion in the box inside / outside direction can be lengthened, it is possible to further suppress the invasion of powdered foreign matter from the outside to the fastening portion.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be composed of an inner groove portion having a groove bottom lower than that of the fastening portion, which is provided between the fastening portion and the fitting groove.
The term "lower than the above-mentioned fastening portion" means that the portion is lower than the contact surface between the opening edge portion and the cover edge portion at the portion corresponding to the fastening portion of the sealing edge portion.

Further, the inner groove portions may be provided continuously along the fitting groove or at predetermined intervals.

According to the present invention, the powdery foreign matter that has entered the fitting groove side from the fastening material side can be dropped into the inner groove portion, so that the powder is brought into contact with the opening edge portion and the cover edge portion and the ring member. The invasion of foreign matter can be further suppressed.

Further, as an aspect of the present invention, the inner groove portion may penetrate to the outside of the sealing edge portion.
The above-mentioned penetration to the outside includes a case where a part or all of the bottom portion of the inner groove portion penetrates to the outside of the sealing edge portion.

According to the present invention, the powdery foreign matter can be discharged to the outside of the sealing edge portion, so that the powdery foreign matter does not collect in the inner groove portion, and the powdery foreign matter does not collect in the opening edge portion and the cover edge portion and the ring. It is possible to further suppress the invasion of the contact portion with the member.

Further, as an aspect of the present invention, the cover edge portion may be provided with an inner groove fitting convex portion that fits into the inner groove portion.
According to the present invention, it is possible to further suppress the movement of the powdery foreign matter accumulated in the inner groove portion above the groove bottom of the inner groove portion. Therefore, it is possible to prevent the powdery foreign matter accumulated in the inner groove portion from moving to the fitting groove side.

Further, as an aspect of the present invention, an outer groove portion having a groove bottom lower than that of the fastening portion may be formed on the outer side of the box from the fastening portion.
The term "lower than the above-mentioned fastening portion" means that the portion is lower than the contact surface between the opening edge portion and the cover edge portion at the portion corresponding to the fastening portion of the sealing edge portion.

The outer groove portion may have a groove bottom that is inclined or horizontal with the electrical connection box mounted on the vehicle.
According to the present invention, since the fastening portion is located higher than the groove bottom of the outer groove portion, the powdery foreign matter that has entered through the gap of the sealing edge portion is accumulated in the outer groove portion without exceeding the fastening portion. Become. Therefore, it is possible to further suppress the movement of the powdery foreign matter to the inside of the box beyond the fastening portion.

Further, as an aspect of the present invention, the outer groove fitting convex portion that fits into the outer groove portion may be provided on the cover edge portion.
According to the present invention, the outer groove fitting convex portion can prevent the powdery foreign matter accumulated in the outer groove portion from moving above the groove bottom of the outer groove portion, so that the powdery foreign matter accumulated in the outer groove portion can be prevented from moving. , It is possible to further suppress the movement to the fitting groove side.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion is provided on at least one of the facing surfaces of the opening edge portion and the cover edge portion constituting the sealing edge portion, and has a surface roughness other than that. It may be composed of a rough surface portion that is rougher than the surface of the portion.

The rough surface portion refers to a state in which a concave-convex shape having substantially the same size as the powder-like foreign matter or larger than the size of the powder-like foreign matter is formed. The rough surface portion may have an uneven shape that is regularly or irregularly arranged. Further, the rough surface portion includes a case where the rough surface portion is provided on all or a part of at least one of the above-mentioned facing surfaces.

The surface roughness may be calculated based on a generally defined value. That is, the calculation method is not particularly limited, and may be calculated by, for example, the arithmetic average roughness Ra, the ten-point average roughness Rz, or the average interval of uneven shapes.

According to the present invention, since the rough surface portion has a larger friction coefficient than the other portions, the powdery foreign matter that has penetrated into the sealing edge portion can be adhered to the rough surface portion. As a result, it is possible to prevent the powdery foreign matter from moving to the fitting groove side of the rough surface portion, and it is possible to prevent the powdery foreign matter from entering the fitting groove arranged on the fitting groove side of the rough surface portion. It can be surely suppressed.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion is provided on at least one of the facing surfaces of the opening edge portion and the cover edge portion constituting the sealing edge portion, and has adhesiveness. It may be composed of parts.

According to the present invention, since the powder-like foreign matter that has entered the sealing edge portion can be adhered to the adhesive portion, it is possible to further suppress the movement of the powder-like foreign matter to the fitting groove side rather than the adhesive portion. Therefore, it is possible to prevent the powdery foreign matter from entering the fitting groove and interfering with the ring member, thereby deteriorating the ring member.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be provided in a fastening hole to which the fastening material is fastened, which is formed at a fastening portion in the opening edge portion.
The above-mentioned provision in the fastening hole includes a case where it is provided at the bottom of the fastening hole, a case where it is provided at an opening portion of the fastening hole, and a case where it is provided on the side surface of the fastening hole.

According to the present invention, it is possible to suppress the movement of powdery foreign matter to the fitting groove side of the fastening hole.
Specifically, it is possible to prevent the powdery foreign matter that has entered from the outside from falling into the fastening hole and moving from the inside of the fastening hole to the fitting groove side. Further, it is possible to prevent the powdery foreign matter generated by the fastening material from rubbing against the fastening hole and the powdery foreign matter generated by the corrosion of the fastening material from moving from the fastening hole to the fitting groove side.

Furthermore, by fastening and fixing the case body and the cover body, the fastening holes are closed with the fastening material, so that it is possible to prevent the powdery foreign matter accumulated in the fastening holes from being discharged to the outside. , It is possible to further suppress the movement to the fitting groove side.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be formed of an upper end recess formed on the peripheral edge of the upper end opening of the fastening hole.
The upper end recess includes a frustum such as a truncated cone and a quadrangular pyramid, and a columnar shape such as a cylinder and a polygonal column.

According to the present invention, the powdery foreign matter can be accumulated in the upper end recess, so that the powdery foreign matter can be suppressed from moving to the fitting groove side. In particular, powdery foreign matter generated by fastening the fastening material and powdery foreign matter generated by corrosion between the fastening material and the cover body can be accumulated in the upper end recess.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be configured by a tapered portion formed on the peripheral edge of the upper end opening of the fastening hole and gradually inclined in the upward diameter increasing direction.
According to the present invention, the powdery foreign matter can be accumulated in the upper end recess, and the powdery foreign matter can be guided to the fastening hole along the tapered portion. As a result, powdery foreign matter can be reliably accumulated in the fastening hole.

Further, when the case body and the cover body are fastened and fixed, the tapered portion can guide the fastening material to the fastening hole, so that the fastening material can be easily fastened, and the fastening material is, for example, a portion other than the fastened portion in the fastening hole. It is possible to prevent unnecessary contact with. As a result, the case body and the cover body can be securely fastened and fixed, and the generation of powdery foreign matter due to unnecessary contact can be suppressed.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion is configured by a bottom space formed between the bottom portion of the fastening hole and the tip end portion of the fastening member to be fastened so that the powdery foreign matter can penetrate. You may.
According to the present invention, for example, powdery foreign matter that has entered through the gap of the sealing edge portion and powdery foreign matter generated between the fastening material and the fastening hole can be accumulated in the bottom space. Further, since the bottom space can be closed with the fastening material, it is possible to more reliably suppress the movement of the powdery foreign matter accumulated in the bottom space to the fitting groove side.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be composed of an inner step portion in which the fitting groove side is higher than the fastening portion.
According to the present invention, since the outer side of the box of the fitting groove is higher than the fastening portion, it is possible to prevent the powdery foreign matter from moving from the fastening portion to the fitting groove. As a result, it is possible to further suppress the movement of the powdery foreign matter to the fitting groove side.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be configured by an internal space formed inside the sealing edge portion along the inner step portion.
According to the present invention, the powdery foreign matter can be accumulated in the internal space, so that the powdery foreign matter can be more reliably suppressed from moving to the fitting groove side.

Further, as an aspect of the present invention, an outer step portion may be formed on the outer side of the box from the fastening portion so that the outer side of the box is lower.
According to the present invention, the fastening portion at the sealing edge portion is higher than the outside of the box, so that the movement of the powdery foreign matter moving from the outside of the box to the fastening portion through the gap of the sealing edge portion to the fastening portion is prevented. Can be done. As a result, it is possible to more reliably prevent the powdery foreign matter from moving to the fitting groove side.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be configured by a groove in-groove recess provided outside the ring member on the groove bottom surface of the fitting groove.
According to the present invention, powdery foreign matter that has entered the fitting groove can be accumulated in the groove inner recess. As a result, it is possible to prevent the powdery foreign matter from interfering with the ring member.

Further, as an aspect of the present invention, the foreign matter intrusion suppressing portion may be formed of an inclined bottom surface in which the bottom surface of the groove in the fitting groove is lowered on the outside of the box.
According to the present invention, the powdery foreign matter that has entered the fitting groove can be guided to the outside of the box inside the fitting groove. As a result, it is possible to prevent the powdery foreign matter from interfering with the ring member.

Further, as an aspect of the present invention, the case body and the cover body may be made of a metal material.
INDUSTRIAL APPLICABILITY According to the present invention, the strength of the electric junction box can be improved, and even when a metal powdery foreign substance generated between the case body and the cover body and the fastening material is generated, the inside of the fitting groove is formed. It is possible to prevent powdery foreign matter from invading the surface.

The present invention can provide an electrical junction box capable of suppressing the intrusion of powdery foreign matter.

Schematic perspective view of the electrical junction box. Schematic exploded perspective view of the electrical junction box. Top view of the electrical junction box. An enlarged cross-sectional view of the sealing edge. An enlarged cross-sectional view of the sealing edge in another embodiment. An enlarged cross-sectional view of the sealing edge in another embodiment. An enlarged cross-sectional view of the sealing edge in another embodiment. An enlarged cross-sectional view of the sealing edge in another embodiment. An enlarged cross-sectional view of the sealing edge in another embodiment. An enlarged cross-sectional view of the sealing edge in another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The electrical junction box 1 of the present embodiment is arranged, for example, in the engine room of a vehicle. Such an electrical connection box 1 will be described with reference to FIGS. 1 to 4.

FIG. 1 shows a schematic perspective view of the electrical junction box 1, and FIG. 2 shows a schematic perspective perspective view of the electrical junction box 1. FIG. 3 shows a plan view of the lower case 10 constituting the electrical connection box 1, and FIG. 4 shows a cross-sectional view taken along the line AA in FIG.
5 to 10 are cross-sectional views taken along the line AA in another embodiment of the electrical connection box 1.

Here, the vertical direction in FIG. 1 is the vertical direction Z, the width direction of the electrical junction box 1 (the direction connecting the upper left and the lower right in FIG. 1) is the width direction W, and the depth direction of the electrical junction box 1 (FIG. 1). The direction connecting the lower left and the upper right in 1) is the depth direction H. Then, in the vertical direction Z, the upper side is the upward direction Zu and the lower side is the downward direction Zd.
Further, the inside / outside direction of the box is the inside / outside direction X of the box, the inside direction of the box is the inside direction of the box IN, and the outside direction of the box is OUT. For convenience, these directions are the same in FIGS. 2 to 10.

The electric junction box 1 is a housing of an aluminum die-cast product in which electronic parts such as fuses and bus bars are stored, and the electronic parts are a battery mounted on a vehicle, other electronic devices, or a car. It is electrically connected to the electronic devices placed in the room.

As shown in FIGS. 1 and 2, the electrical connection box 1 is composed of a lower case 10, an upper case 20, and a ring member 30 sandwiched between the lower case 10 and the upper case 20. Then, the electric connection box 1 is assembled by fastening and fixing the lower case 10 and the upper case 20 with bolts 40.

First, the bolt 40 for fastening and fixing the lower case 10 and the upper case 20 will be described. The bolt 40 is an iron fastening material, and as shown in FIG. 2, the bolt 40 is integrally composed of a columnar bolt head 41 and a bolt tip 42 extending downward Zd from the bolt head 41. .. The bolt tip 42 is provided with a screw thread so that it can be screwed.

The lower case 10 constituting the electrical connection box 1 is an internal hollow housing having an opening O opened in the upward direction Zu, and a space for accommodating electronic components is formed inside. As shown in FIGS. 1 to 4, the lower case 10 is composed of a lower bottom surface portion 11, a lower side surface portion 12, a lower edge portion 13, and a lower side fastening portion 14.

As shown in FIGS. 1 to 3, the lower bottom surface portion 11 is a flat plate having a substantially rectangular shape in a plan view, and constitutes the bottom surface of the electrical connection box 1. A lower side surface portion 12 stands up from the outer edge of the lower bottom surface portion 11. The lower bottom surface portion 11 and the lower side surface portion 12 have the same plate thickness, and the length thereof is defined as the first length L1.

The lower edge portion 13 is a protruding piece that protrudes from the outer edge of the lower side surface portion 12 toward the OUT of the electrical connection box 1 in the box outer direction, and has a predetermined plate thickness. The protruding length of the lower edge portion 13 protruding toward the OUT of the lower case 10 in the box outer direction is the second length L2. The second length L2 is configured to be longer than the first length L1, which is the length of the plate thickness of the lower side surface portion 12.

In the box inner direction IN of the lower edge portion 13 configured in this way, a fitting groove 50 recessed in the downward direction Zd is formed in an annular shape along the outer edge of the lower side surface portion 12.
As shown in FIG. 4, the fitting groove 50 is composed of a fitting groove main body 51 and a groove inner recess 52 provided at the bottom of the outer box of the fitting groove main body 51.

The fitting groove main body 51 is a groove provided at the end of the lower edge portion 13 in the box inner direction IN, and the cross-sectional shape in the cross section viewed from the surface along the box inner / outer direction X is formed to be concave. .. The groove width of the fitting groove main body 51 along the box inner / outer direction X is approximately twice the groove depth along the vertical direction Z.

The groove inner recess 52 is a groove recessed in the downward Zd at the end of the box outer side OUT of the bottom surface of the fitting groove main body 51 (main body bottom surface 51a), and is a groove recessed in the downward direction Zd. Is inclined downward Zd toward OUT in the box outer direction.

Further, as shown in FIGS. 1 and 2, lower side fastening portions 14 are provided at each corner portion of the lower edge portion 13 and at the central portion of the side along the width direction W. The lower side fastening portion 14 is a fastening portion for screwing the bolt 40 for fastening and fixing the lower case 10 and the upper case 20, and the central portion of the lower side fastening portion 14 is screwed with the bolt tip portion 42. A bottomed cylindrical cylindrical hole portion 15 is provided.

As shown in FIGS. 2 and 4, the cylindrical hole portion 15 is composed of a cylindrical inner surface 15a, a cylindrical bottom surface 15b, and an inclined edge portion 15c.
The inner surface of the cylinder 15a is a cylindrical inner peripheral surface having the same inner diameter as the outer diameter of the bolt tip 42, and a screw groove formed on the surface so as to be screwable with the thread of the bolt tip 42 (not shown). Is provided.

The bottom surface 15b of the cylinder is a bottom surface provided at the end of the inner surface 15a of the cylinder in the downward direction Zd. As shown in FIG. 4, the cylindrical bottom surface 15b is arranged in a direction Zd lower than the end portion of the bolt tip portion 42 in the downward direction Zd in a state where the lower case 10 and the upper case 20 are fastened and fixed by bolts 40. There is. That is, in a state where the lower case 10 and the upper case 20 are fastened and fixed with bolts 40, a bottom space S1 is formed between the bottom surface of the bolt tip portion 42 and the bottom surface of the cylinder 15b.

As shown in FIG. 4, the inclined edge portion 15c is inclined from the end portion of the upward direction Zu of the cylindrical inner surface 15a toward the outer side in the radial direction toward the upward direction Zu, and the upper end portion and the lower portion of the cylindrical inner surface 15a. It is connected to the upper surface of the edge portion 13.

As shown in FIG. 4, the length from the box outer direction OUT of the cylindrical hole portion 15 to the end of the box outer direction OUT of the lower side fastening portion 14 is set to the third length L3, and the inside of the box of the cylindrical hole portion 15. The length from the direction IN to the end of the box outer direction OUT of the fitting groove 50 is set to the fourth length L4. The cylindrical hole portion 15 and the fitting groove 50 configured as described above are arranged so that the fourth length L4 is longer than the first length L1 and the third length L3.

Further, as shown in FIG. 4, a bottomed inner groove portion 61 recessed downward Zd from the upper surface of the lower edge portion 13 is fitted in the intermediate portion between the fitting groove 50 and the cylindrical hole portion 15. It is provided along the groove 50. The groove depth of the inner groove portion 61 is substantially the same as that of the fitting groove 50, and the groove bottom is located at a position lower than the upper surface of the lower edge portion 13 at the position where the bolt 40 is fastened to the cylindrical hole portion 15.

The upper case 20 is a lid that closes the opening O of the lower case 10, and as shown in FIGS. 1 to 4, the upper upper surface portion 21, the upper side surface portion 22, the upper edge portion 23, and the upper side fastening portion 24 It is composed of and.

Like the lower bottom surface portion 11, the upper upper surface portion 21 is a flat plate having a substantially rectangular shape in a plan view, and constitutes the upper surface of the electrical connection box 1. Then, the upper side surface portion 22 stands upright from the outer edge of the upper upper surface portion 21 toward the downward Zd.

As shown in FIGS. 1 to 4, the upper edge portion 23 is a protruding piece that protrudes from the outer edge of the upper side surface portion 22 toward the outside of the electrical connection box 1, and the amount of protrusion thereof is the lower portion with respect to the lower side surface portion 12. It is equal to the amount of protrusion of the edge portion 13 (second length L2). Further, an upper side fastening portion 24 is provided at the central portion and each corner portion of the side of the upper edge portion 23 along the width direction W.

Like the lower side fastening portion 14, the upper side fastening portion 24 is a fastening portion for inserting and fixing the bolt 40 which is a fastening material, and the upper side penetrating the central portion along the vertical direction Z. An insertion hole 25 is provided. The inner diameter of the upper side insertion hole 25 is configured to be equal to the outer diameter of the bolt tip portion 42, and the inner peripheral surface (insertion port inner peripheral surface 25a) of the upper side insertion hole 25 has a screw thread of the bolt tip portion 42. A screw groove (not shown) for screwing is provided.

Then, in the box inner direction IN of the upper side insertion hole 25, an inner groove fitting protrusion 62 projecting downward Zd in the assembled state in which the lower case 10 and the upper case 20 are assembled is provided on the upper side surface portion 22. It is erected along the outer circumference of. More specifically, the inner groove fitting protrusion 62 is arranged at a position facing the inner groove portion 61 in a state where the lower case 10 and the upper case 20 are assembled. The inner groove fitting protrusion 62 has the same height as the depth of the inner groove portion 61.

The ring member 30 is an elastic rubber O-ring configured in an annular shape. As shown in FIG. 2, the ring member 30 is composed of a ring main body 31 provided in an annular shape and a ring convex portion 32 protruding outward from the ring main body 31.

The ring main body 31 is an annular body having a substantially perfect circular cross section, and is configured so that the total length is slightly shorter than the total length of the fitting groove main body 51. Further, the diameter of the cross section of the ring main body 31 is slightly longer than the depth of the fitting groove main body 51, and is configured to be approximately half the width of the fitting groove main body 51.

As shown in FIG. 2, the ring convex portion 32 projects on both sides along one of the directions orthogonal to the axial direction of the ring main body 31. The amount of protrusion of the ring convex portion 32 is approximately one-fourth of the outer diameter of the ring main body 31. A plurality of ring convex portions 32 configured in this manner (six in the present embodiment) are provided along the ring main body 31 at predetermined intervals.

The electrical connection box 1 can be assembled by fitting the ring member 30 configured in this way into the fitting groove 50 provided in the lower edge portion 13 and fastening and fixing the lower case 10 and the upper case 20 with bolts 40. .. Further, the electrical connection box 1 in which the lower case 10 and the upper case 20 are assembled in this way is configured with a sealing edge portion 2 composed of a lower edge portion 13 and an upper edge portion 23 facing each other.

Since the ring member 30 fitted in the fitting groove 50 is configured such that the total length of the ring main body 31 is slightly shorter than the total length of the fitting groove main body 51, the ring member 30 is formed as shown in FIG. It is arranged in the fitting groove main body 51 so as to abut on the inner side surface of the box of the fitting groove main body 51. Further, as shown in FIG. 4, the ring member 30 fitted in the fitting groove main body 51 is surface-pressed by the upper edge portion 23, and the cross section becomes elliptical.

Further, at the central portion of the cylindrical hole portion 15 and the fitting groove 50 in the sealing edge portion 2, the inner groove fitting protrusion 62 is fitted to the inner groove portion 61. The inner groove portion 61 and the inner groove fitting protrusion 62 fitted in this way form an inner intrusion suppressing portion 60 along the outer edge of the fitting groove 50.

In the sealing edge portion 2, a cylindrical hole portion 15, an inner intrusion suppressing portion 60, and an in-groove recess 52 are arranged in this order from the box outer direction OUT to the box inner direction IN. By the inner intrusion suppressing portion 60, for example, dust such as sand and dust invading from the outside, abrasion powder generated by abrasion between the bolt 40 and the cylindrical hole portion 15, and metal species of the lower case 10, the upper case 20, and the bolt 40. Invasion of powdery foreign matter such as powdery particles caused by the difference into the fitting groove 50 is suppressed.

In this way, the electrical connection box 1 includes a lower case 10 having an opening O and a lower edge portion 13 and an upper case 20 having an upper edge portion 23 that closes the opening O of the lower case 10 and is combined with the lower edge portion 13. It is equipped. Further, a rubber ring member 30 to be fitted into the fitting groove 50 formed in the lower edge portion 13 is provided. Then, the lower edge portion 13 and the upper edge portion 23 are combined to form a sealing edge portion 2 for sealing, and the upper edge portion 23 is penetrated to fasten the cylindrical hole portion 15 of the sealing edge portion 2. A bolt 40 is provided. Further, an inner intrusion suppressing portion 60 that suppresses the intrusion of powdery foreign matter into the contact portion between the lower edge portion 13 and the upper edge portion 23 and the ring member 30 is provided between the cylindrical hole portion 15 and the fitting groove 50. It is provided in.

As a result, the inner intrusion suppressing portion 60 provided between the cylindrical hole portion 15 and the fitting groove 50 can suppress the invasion of the powdery foreign matter into the box inner direction IN. As a result, it is possible to prevent the powdery foreign matter from deteriorating the ring member 30, and it is possible to maintain the water stopping property.

More specifically, the lower case 10 and the upper case 20 are made of aluminum, which is a metal material, and the bolt 40 for fastening and fixing the lower case 10 and the upper case 20 is an iron fastening material. If water enters between the lower case 10 and the upper case 20 and the bolt 40, powdery foreign matter may be generated due to the difference in ionization tendency.

Further, powdery foreign matter such as sand or dust from the outside may enter from between the lower edge portion 13 and the upper edge portion 23. Further, abrasion powder (powder-like foreign matter) may be generated due to friction caused by fastening and fixing the cylindrical hole portion 15 and the upper side insertion hole 25 and the bolt 40.

These powdery foreign substances may interfere with the rubber ring member 30 to damage or deteriorate the ring member 30. However, by providing the inner intrusion suppressing portion 60 between the cylindrical hole portion 15 and the fitting groove 50, it is possible to suppress the invasion of powdery foreign matter into the box inner direction IN.

Further, since the distance X between the cylindrical hole portion 15 and the fitting groove 50 in the lower edge portion 13 in the box inner / outer direction X (fourth length L4) is wider than the wall thickness of the lower case 10 (first length L1), the lower edge portion The distance between the 13 and the upper edge 23 and the contact point between the ring member 30 can be increased. As a result, even if powdery foreign matter enters between the cylindrical hole portion 15 and the fitting groove 50, the lower edge portion 13 and the upper edge portion 23 and the ring member 30 are in the form of powder. It is possible to suppress the invasion of foreign substances.

Furthermore, since the distance between the cylindrical hole portion 15 and the fitting groove 50 in the lower edge portion 13 in the box inner / outer direction X is wider than the wall thickness of the lower case 10, an inner intrusion suppressing portion 60 is provided along the box inner / outer direction X. It is easy, and a plurality of inside intrusion suppression portions 60 can be provided. Therefore, it is possible to further suppress the invasion of powdery foreign matter into the contact points between the lower edge portion 13 and the upper edge portion 23 and the ring member 30.

Furthermore, the distance (fourth length L4) between the cylindrical hole portion 15 and the fitting groove 50 in the lower edge portion 13 in the box inner / outer direction X is the outer surface of the cylindrical hole portion 15 and the lower edge portion 13 in the lower edge portion 13. It is wider than the space between the inside and outside of the box X (third length L3). As a result, the distance between the cylindrical hole portion 15 and the fitting groove 50 in the lower edge portion 13 in the box inner / outer direction X can be lengthened. Therefore, it is possible to further prevent the powdery foreign matter that has entered from the outside from entering the cylindrical hole portion 15.

Further, by providing an inner groove portion 61 having a groove bottom lower than the upper surface of the lower edge portion 13 provided with the cylindrical hole portion 15 provided between the cylindrical hole portion 15 and the fitting groove 50, the inner groove portion 61 is provided in the box outer direction. The powdery foreign matter that has entered the box inner direction IN from OUT can be dropped into the inner groove portion 61. Therefore, it is possible to further suppress the invasion of powdery foreign matter into the contact points between the lower edge portion 13 and the upper edge portion 23 and the ring member 30.

Furthermore, since the upper edge portion 23 is provided with the inner groove fitting protrusion 62 that fits into the inner groove portion 61, the powdery foreign matter dropped into the inner groove portion 61 can be removed from the groove bottom of the inner groove portion 61. Can be more suppressed from moving upward. Therefore, it is possible to prevent the powdery foreign matter accumulated in the inner groove portion 61 from moving toward the IN inside the box.

Further, the cylindrical hole portion 15 to which the bolt 40 formed in the lower side fastening portion 14 of the lower edge portion 13 is fastened can suppress the movement of the powdery foreign matter in the box inner direction IN from the cylindrical hole portion 15.
Specifically, when the powder-like foreign matter that has entered from the outside falls into the cylindrical hole portion 15, it is possible to suppress the movement of the powder-like foreign matter from the inside of the cylindrical hole portion 15 toward the inside of the box IN. Further, it is possible to prevent the powdery foreign matter generated by the bolt 40 from rubbing against the cylindrical hole portion 15 and the powdery foreign matter generated by the corrosion of the bolt 40 from moving from the cylindrical hole portion 15 to the IN in the box inner direction.

Furthermore, by fastening and fixing the lower case 10 and the upper case 20, the cylindrical hole portion 15 is closed by the bolt 40, so that the powdery foreign matter accumulated in the cylindrical hole portion 15 is discharged to the outside. It can be suppressed, and the movement toward the inside of the box IN can be further suppressed.

Further, since the inclined edge portion 15c is provided on the peripheral edge of the upper end opening of the cylindrical hole portion 15, powder-like foreign matter can be accumulated in the inclined edge portion 15c, and the powder-like foreign matter is directed toward the inside of the box. It is possible to suppress the movement to IN. In particular, powdery foreign matter generated by fastening the bolt 40 to the upper side insertion hole 25 and powdery foreign matter generated by corrosion between the bolt 40 and the upper side insertion hole 25 are accumulated in the inclined edge portion 15c. be able to.

Furthermore, the inclined edge portion 15c formed on the peripheral edge of the upper end opening of the cylindrical hole portion 15 is configured to gradually incline in the diameter-expanding direction toward Zu. As a result, the powdery foreign matter can be accumulated in the inclined edge portion 15c, and the powdery foreign matter can be guided to the cylindrical hole portion 15 along the inclined edge portion 15c. Therefore, the powdery foreign matter can be reliably accumulated in the cylindrical hole portion 15.

Further, when the lower case 10 and the upper case 20 are fastened and fixed, the inclined edge portion 15c can guide the bolt 40 to the cylindrical hole portion 15, so that the bolt 40 can be easily fastened, and the bolt 40 is, for example, the cylindrical hole portion 15. It is possible to prevent unnecessary contact with a portion other than the portion to be fastened. As a result, the lower case 10 and the upper case 20 can be securely fastened and fixed, and the generation of powdery foreign matter due to unnecessary contact can be suppressed.

Further, a bottom space S1 formed between the bottom of the cylindrical hole 15 and the tip of the bolt 40 fastened to allow powdery foreign matter to enter is formed. As a result, for example, powdery foreign matter that has entered through the gap between the lower edge portion 13 and the upper edge portion 23 and powdery foreign matter generated between the bolt 40 and the cylindrical hole portion 15 are accumulated in the bottom space S1. Can be done. Further, since the bottom space S1 can be closed with the bolt 40, it is possible to more reliably suppress the movement of the powdery foreign matter accumulated in the bottom space S1 in the inner direction of the box IN.

Further, since it is composed of the groove inner recess 52 provided on the outside of the ring member 30 on the bottom surface 51a of the main body of the fitting groove 50, the powder-like foreign matter that has entered the fitting groove 50 is sent into the groove recess 52. Can accumulate. As a result, it is possible to prevent the powdery foreign matter from interfering with the ring member 30.

Further, since the bottom surface of the groove in the fitting groove 50 is composed of the bottom surface 52a of the recess in which the outside of the box is lowered, the powdery foreign matter that has entered the fitting groove 50 is sent to the outside of the box inside the fitting groove 50. I can guide you. As a result, it is possible to prevent the powdery foreign matter from interfering with the ring member 30.

Furthermore, since the lower case 10 and the upper case 20 are made of a metal material, the strength of the electrical connection box 1 can be improved. Further, even when metal powdery foreign matter generated between the lower case 10 and the upper case 20 and the bolt 40 is generated, it is possible to prevent the powdery foreign matter from entering the inside of the fitting groove 50.

Next, the electrical connection box 1w of the second embodiment shown in FIG. 5 will be described.
The electric junction box 1w has the same configuration as the above-mentioned electrical junction box 1 and has the same effect, but has a characteristic configuration that further exerts an effect. In the following, the same components as those of the electric connection box 1 will be designated by the same reference numerals in the electric connection box 1w, and the description thereof will be omitted, and the characteristic configurations will be described in detail. Similarly, in the description of other embodiments described later, the characteristic configuration in each embodiment will be described.

In the assembled state in which the lower case 10 and the upper case 20 are assembled, the electrical connection box 1 has a cylindrical hole portion 15, an inner intrusion suppressing portion 60, and a fitting groove from the box outer direction OUT to the box inner direction IN. 50 and 50 are arranged in the sealing edge portion 2 in this order.

Similar to the electric junction box 1, the electric connection box 1w is fitted with a cylindrical hole portion 15 and an inner intrusion suppression portion 60w corresponding to the inner intrusion suppression portion 60 from the box outer direction OUT to the box inner direction IN. The grooves 50 and the grooves 50 are arranged in the sealing edge portion 2 in this order.

The inner intrusion suppressing portion 60w has a predetermined through hole 63 penetrating downward Zd at the end of the inner groove portion 61 bottom surface (inner groove bottom surface 61a) in the box inner direction IN along the fitting groove 50. It is provided at intervals.

As described above, the electric connection box 1w can discharge the powdery foreign matter to the outside of the sealing edge portion 2 by providing the through hole 63 penetrating to the outside of the sealing edge portion 2 on the inner groove bottom surface 61a. .. As a result, the powdery foreign matter does not collect in the inner groove portion 61, and the powdery foreign matter can be further suppressed from entering the contact portion between the lower edge portion 13 and the upper edge portion 23 and the ring member 30.

In the electrical connection box 1w, the through hole 63 penetrates from the bottom surface of the inner groove portion 61 in the downward direction Zd. However, for example, when the inner intrusion suppressing portion 60w is arranged along the fitting groove 50 at a predetermined interval, not only a part of the bottom surface of the inner intrusion suppressing portion 60w but also the inner intrusion suppressing portion 60w May penetrate to the downward Zd of the lower edge portion 13.

Next, the electrical connection box 1x of the second embodiment shown in FIG. 6 will be described.
The electrical junction box 1x has the same configuration as the electrical junction box 1 described above and has the same effect, but has a characteristic configuration that further exerts an effect. In the following, the same components as those of the electric connection box 1 in the electric connection box 1x are designated by the same reference numerals, the description thereof will be omitted, and the characteristic configurations will be described in detail. Similarly, in the description of other embodiments described later, the characteristic configuration in each embodiment will be described.

In the assembled state in which the lower case 10 and the upper case 20 are assembled, the electrical connection box 1 includes a cylindrical hole portion 15, an inner intrusion suppression portion 60, and a fitting groove 50 from the box outer direction OUT to the box inner direction IN. Are arranged in the sealing edge 2 in this order.

On the other hand, in the electric connection box 1x, similarly to the electric connection box 1, the cylindrical hole portion 15, the rough surface portion 70, and the fitting groove 50 are arranged in this order from the box outer direction OUT to the box inner direction IN. It is arranged at the sealing edge portion 2. That is, in the electrical connection box 1x, a rough surface portion 70 is provided between the cylindrical hole portion 15 and the fitting groove 50 instead of the inner intrusion suppressing portion 60.

The rough surface portion 70 is an uneven surface provided on the upper surface of the lower edge portion 13 and the bottom surface of the upper edge portion 23 facing each other in the central portion of the sealing edge portion 2 in the box inner / outer direction X, and is fitted. It is provided in the box outer direction OUT of the groove 50.

The rough surface portion 70 is composed of a lower rough surface portion 71 provided on the upper surface of the lower edge portion 13 and an upper rough surface portion 72 provided on the bottom surface of the upper edge portion 23. The lower rough surface portion 71 and the upper rough surface portion 72 are formed of a concave-convex shape in which concave portions and convex portions are irregularly arranged. The average value of the height difference between the bottom of the concave portion and the apex portion of the convex portion is configured to be larger than the size of the powdery foreign matter. Therefore, the friction coefficient of the rough surface portion 70 is larger than that of the lower edge portion 13 and the other portions of the upper edge portion 23.
In this embodiment, when the lower case 10 and the upper case 20 are assembled, the lower rough surface portion 71 and the upper rough surface portion 72 are provided so as to mesh with each other.

As described above, the electrical connection box 1x is provided with a rough surface portion 70 having a surface roughness coarser than the surface of the other portion on the facing surfaces of the lower edge portion 13 and the upper edge portion 23 constituting the sealing edge portion 2. ing. Since the rough surface portion 70 has a larger friction coefficient than the other portions, the powdery foreign matter that has entered the sealing edge portion 2 is adhered to the rough surface portion 70.

The surface roughness of the rough surface portion 70 may be calculated based on a generally defined value. That is, the calculation method is not particularly limited, and is obtained by, for example, the arithmetic average roughness Ra, the ten-point average roughness Rz, or the average interval of uneven shapes.

As a result, in the electrical connection box 1x, it is possible to prevent the powdery foreign matter from moving in the box inner direction IN from the rough surface portion 70, and the powder is formed in the fitting groove 50 arranged in the box inner direction IN from the rough surface portion 70. It is possible to more reliably suppress the invasion of foreign matter.

In the electrical connection box 1x, rough surface portions 70 are provided on the upper surface of the lower edge portion 13 and the bottom surface of the upper edge portion 23, respectively, but on one of the upper surface of the lower edge portion 13 and the bottom surface of the upper edge portion 23. Only the rough surface portion 70 may be provided. Further, in the state where the lower case 10 and the upper case 20 are assembled, it is not necessary that the lower rough surface portion 71 and the upper rough surface portion 72 mesh with each other.

Further, the rough surface portion 70 may have irregular shapes arranged regularly, and further, the uneven shape of the rough surface portion 70 has an average value of the height difference between the bottom of the concave portion and the apex portion of the convex portion. It may be substantially the same size as the powdery foreign matter.

Further, in the electrical connection box 1x, the rough surface portion 70 is provided between the cylindrical hole portion 15 and the fitting groove 50, but instead of the rough surface portion 70, an adhesive portion 70x having adhesiveness may be provided ( (See FIG. 7). In the electrical connection box 1x shown in FIG. 7, the adhesive portion 70x is provided only on the upper surface of the lower edge portion 13.

As a result, the powder-like foreign matter that has penetrated into the sealing edge portion 2 can be adhered to the adhesive portion 70x, so that the powder-like foreign matter can be further suppressed from moving in the box inner direction IN than the adhesive portion 70x. Therefore, it is possible to prevent the powdery foreign matter from entering the fitting groove 50 and interfering with the ring member 30 to deteriorate the ring member 30.

Next, the electrical connection box 1y of the fourth embodiment shown in FIG. 8 will be described.
The electric junction box 1y has the same configuration as the above-mentioned electrical junction box 1 and has the same effect, but has a characteristic configuration that further exerts an effect. In the following, the same components as those of the electric connection box 1 will be designated by the same reference numerals in the electric connection box 1y, and the description thereof will be omitted, and the characteristic configurations will be described in detail. Similarly, in the description of other embodiments described later, the characteristic configuration in each embodiment will be described.

As shown in FIG. 4, the electrical connection box 1 has a cylindrical hole portion 15 and an inner intrusion suppression portion from the box outer direction OUT to the box inner direction IN in the assembled state in which the lower case 10 and the upper case 20 are assembled. The 60 and the fitting groove 50 are arranged in the sealing edge portion 2 in this order.

On the other hand, in the electric connection box 1y, similarly to the electric connection box 1, the cylindrical hole portion 15, the inner intrusion suppressing portion 60, and the fitting groove 50 are formed from the box outer direction OUT to the box inner direction IN. In addition to being arranged in the sealing edge portion 2 in this order, an outer restraining portion 80 is provided at the box outer direction OUT of the cylindrical hole portion 15.

As shown in FIG. 8, the outer restraining portion 80 is provided at the box outer direction OUT of the cylindrical hole portion 15 in the sealing edge portion 2. The outer restraining portion 80 has an outer groove portion 81 formed by recessing a part of the upper surface of the lower edge portion 13 that comes into contact with the upper edge portion 23 in the upward direction Zu, and an outer groove fitting that fits into the outer groove portion 81. It is composed of a convex portion 82.

As shown in FIG. 8, the outer groove portion 81 is a groove provided in the box outer direction OUT of the lower edge portion 13, and the cross-sectional shape of the cross section viewed from the surface along the box inner / outer direction X is formed to be concave. ing.
The outer groove fitting convex portion 82 is a protruding portion provided on the outer side OUT of the box of the upper edge portion 23 so as to fit with the outer groove portion 81 in the assembled state in which the lower case 10 and the upper case 20 are assembled. It is configured.

The electrical connection box 1y configured in this way has an outer groove portion 81 whose groove bottom is lower than the upper surface of the lower edge portion 13 provided with the cylindrical hole portion 15 on the outer side of the box (OUT in the box outer direction) from the cylindrical hole portion 15. It is formed. As a result, since the cylindrical hole portion 15 is located at a position higher than the groove bottom of the outer groove portion 81, the powdery foreign matter that has entered the gap of the sealing edge portion 2 from the OUT in the box outer direction falls into the outer groove portion 81. It will be accumulated. Therefore, it is possible to further suppress the movement of the powdery foreign matter to the inside of the box (IN in the inside of the box) beyond the cylindrical hole portion 15.

Further, since the upper edge portion 23 is provided with the outer groove fitting convex portion 82 that fits into the outer groove portion 81, the powdery foreign matter accumulated in the outer groove portion 81 is more than the groove bottom of the outer groove portion 81. The upward movement can be suppressed by the outer groove fitting convex portion 82. Therefore, it is possible to further suppress the movement of the powdery foreign matter accumulated in the outer groove portion 81 toward the inside of the box IN.

In the electric connection box 1y, the groove bottom of the outer groove portion 81 is horizontal with the electric connection box 1 mounted on the vehicle. However, the groove bottom of the outer groove portion 81 may be inclined. Further, in a state where the outer groove fitting convex portion 82 is fitted to the outer groove portion 81, a space may be provided between the bottom surface of the outer groove fitting convex portion 82 and the groove bottom surface of the outer groove portion 81.

Furthermore, in the electrical connection box 1y, the outer groove portion 81 is composed of a groove having a concave cross section in a cross section viewed from a surface along the inner / outer direction X of the box. However, it is not always necessary to form a groove in the box outer direction OUT of the cylindrical hole portion 15, and an outer step portion 81y may be provided instead of the outer groove portion 81 (see FIG. 9).

As shown in FIG. 9, the outer step portion 81y is a step provided by cutting out the end portion of the lower edge portion 13 in the box outer direction OUT in the downward direction Zd. That is, the outer step portion 81y is provided with a bottom surface of the step below the upper end surface of 13.

An outer step fitting portion 82y configured to fit the outer step portion 81y is provided at the end of the upper edge portion 23 in the box outer direction OUT. Further, the outer step portion 81y and the outer step fitting portion 82y form an outer suppressing portion 80y.
As described above, since the outer step portion 81y that lowers the outer side of the box is formed on the outer side of the box than the cylindrical hole portion 15, it is possible to more reliably suppress the movement of the powdery foreign matter in the IN direction inside the box.

Next, the electric junction box 1z of the fifth embodiment shown in FIG. 10 will be described.
The electric junction box 1z has the same configuration as the above-mentioned electrical junction box 1 and has the same effect, but has a characteristic configuration that further exerts an effect. In the following, the same components as those of the electric connection box 1 in the electric connection box 1z are designated by the same reference numerals, the description thereof will be omitted, and the characteristic configurations will be described in detail. Similarly, in the description of other embodiments described later, the characteristic configuration in each embodiment will be described.

As shown in FIG. 4, the electrical connection box 1 has a cylindrical hole portion 15 and an inner intrusion suppression portion from the box outer direction OUT to the box inner direction IN in the assembled state in which the lower case 10 and the upper case 20 are assembled. The 60 and the fitting groove 50 are arranged in the sealing edge portion 2 in this order.

On the other hand, in the electric connection box 1z, similarly to the electric connection box 1, the cylindrical hole portion 15, the inner intrusion suppressing portion 60, and the fitting groove 50 are formed from the box outer direction OUT to the box inner direction IN. They are arranged in the sealing edge portion 2 in this order, and an inner step suppressing portion 90 is provided between the inner intrusion suppressing portion 60 and the fitting groove 50.

As shown in FIG. 8, the inner step suppressing portion 90 is provided at the box outer direction OUT of the fitting groove 50 in the sealing edge portion 2. The inner step suppressing portion 90 is composed of an inner step portion 91 provided on the lower edge portion 13 and an inner step contact portion 92 in which the upper edge portion 23 is cut out.

As shown in FIG. 10, the inner step portion 91 is provided so as to project upward from the box outer direction OUT of the fitting groove 50 in the lower edge portion 13. That is, the inner step portion 91 is provided in the upward direction Zu from the upper surface of the lower edge portion 13.

The inner step contact portion 92 is formed by cutting out the box inner direction IN of the upper edge portion 23. The depth of the notch of the inner step contact portion 92 with respect to the bottom surface of the upper edge portion 23 is configured to be equal to the height of the inner step portion 91. Further, the outer end surface 92a of the box outer side OUT of the inner step contact portion 92 is arranged on the box outer side OUT with respect to the protruding outer surface 91a of the box outer direction OUT of the inner step portion 91, and the outer end surface 92a and the protruding outer surface are arranged. The inner space S2 is formed between the 91a and the 91a.

The electrical connection box 1z configured in this way is provided with an inner step portion 91 whose IN in the box inner direction is higher than that of the cylindrical hole portion 15, so that the powder-like foreign matter is formed from the cylindrical hole portion 15 to the fitting groove 50. Can prevent the movement. As a result, it is possible to further suppress the movement of the powdery foreign matter in the IN direction toward the inside of the box.

Further, since the inner step suppressing portion 90 is composed of the inner space S2 formed inside the sealing edge portion 2 along the inner step portion 91, powdery foreign matter is accumulated in the inner space S2. Therefore, it is possible to more reliably suppress the movement of the powdery foreign matter in the IN direction toward the inside of the box.

In the electrical connection box 1z, the inner step portion 91 and the inner step contact portion 92 form the inner space S2, but it is not always necessary to form the inner space S2. For example, the protruding outer surface 91a and the outer end surface 92a And may be configured to come into contact with each other.

Further, in the electrical connection box 1z, the inner step contact portion 92 is formed by cutting out the upper edge portion 23 up to the end of the box inner direction IN, but the outer groove portion 81 can be fitted to the upper edge portion 23. It may be such a recess.

In the correspondence between the configuration of the present invention and the above-described embodiment, the opening corresponds to the opening O.
Similarly below
The opening edge corresponds to the lower edge 13 and
The case body corresponds to the lower case 10
The cover edge corresponds to the upper edge 23,
The cover body corresponds to the upper case 20
The fitting groove corresponds to the fitting groove 50 and
The ring member corresponds to the ring member 30 and
The sealing edge portion corresponds to the sealing edge portion 2 and
The fastening material corresponds to the bolt 40,
The foreign matter intrusion suppressing portion corresponds to the cylindrical hole portion 15, the groove recess 52, the inner intrusion suppressing portion 60, the rough surface portion 70, the outer suppressing portion 80, and the inner step suppressing portion 90.
The electric junction box corresponds to the electric junction box 1, the electric junction box 1w, the electric junction box 1x, the electric junction box 1y, and the electric junction box 1z.
The inner groove portion corresponds to the inner groove portion 61,
The inner groove fitting convex portion corresponds to the inner groove fitting protrusion 62, and corresponds to the inner groove fitting protrusion 62.
The fastening hole corresponds to the cylindrical hole portion 15 and
The upper end recess corresponds to the inclined edge 15c,
The tapered portion corresponds to the inclined edge portion 15c and
The bottom space corresponds to the bottom space S1
The in-groove recess corresponds to the in-groove recess 52,
The inclined bottom surface corresponds to the concave bottom surface 52a and
The rough surface portion corresponds to the rough surface portion 70,
The adhesive part corresponds to the adhesive part 70x,
The outer groove portion corresponds to the outer groove portion 81,
The outer groove fitting convex portion corresponds to the outer groove fitting convex portion 82, and corresponds to the outer groove fitting convex portion 82.
The inner step portion corresponds to the outer groove portion 81,
The internal space corresponds to the inner space S2,
Although the outer step portion corresponds to the outer step portion 81y, the present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

In the present embodiment, the lower case 10 and the upper case 20 are made of aluminum, but are not limited to those made of aluminum, and include those made of other metals or resins.
Further, the above-mentioned configurations of the electric junction boxes 1, 1w, 1x, 1y, and 1z are not limited to the configurations, and each configuration may be appropriately combined. For example, the rough surface portion 70 and the adhesive portion 70x may be provided between the cylindrical hole portion 15 in the electrical connection box 1 and the inner intrusion suppressing portion 60, or may be provided in the box outer direction OUT of the cylindrical hole portion 15. Further, the rough surface portion 70 and the adhesive portion 70x may be provided on the bottom surface 61a of the inner groove.

Further, in the present embodiment, the length of the plate thickness (that is, the wall thickness) of the lower side surface portion 12 is the first length L1 and is constant. However, an electric junction box in which the plate thickness of the lower side surface portion 12 is partially different is also conceivable. The plate thickness of the lower side surface portion 12 in such a case where the plate thickness of the lower side surface portion 12 is partially different may be calculated as, for example, an average value of the plate thickness of the lower side surface portion 12, or may be partially calculated. It may be calculated as the plate thickness of the lower side surface portion 12 excluding the portions having different plate thicknesses.

1,1x ~ 1z Electrical junction box 2 Sealing edge 10 Lower case 13 Lower edge 15 Cylindrical hole 15c Inclined edge 15c Inclined edge 20 Upper case 23 Upper edge 30 Ring member 40 Bolt 50 Fitting groove 52 Inside groove Recess 52a Recess bottom surface 60 Inner intrusion suppression portion 61 Inner groove portion 62 Inner groove fitting protrusion 70 Rough surface portion 70 x Adhesive portion 80 Outer suppression portion 81 Outer groove portion 82 Outer groove fitting convex portion 90 Inner step suppression portion 91 Inner step portion 81y Outside Step S1 Bottom space S2 Inner space O Opening

Claims (20)

A case body having an opening and an opening edge,
A cover body having a cover edge that closes the opening of the case body and is combined with the opening edge.
A rubber ring member to be fitted into the fitting groove formed in the opening edge is provided.
The opening edge portion and the cover edge portion are combined to form a sealing edge portion for sealing, and the sealing edge portion is formed.
A fastening material that penetrates the cover edge portion and fastens the fastening portion of the sealing edge portion is provided.
A foreign matter intrusion suppressing portion for suppressing the intrusion of powdery foreign matter into the contact portion between the opening edge portion and the cover edge portion and the ring member is provided between the fastening portion and the fitting groove. Electric junction box. The distance between the fastening point and the fitting groove at the opening edge in the box inside / outside direction is
The electrical connection box according to claim 1, which is wider than the wall thickness of the case body. The distance between the fastening point and the fitting groove at the opening edge in the box inside / outside direction is
The electrical connection box according to claim 1 or 2, wherein the distance between the fastening portion at the opening edge portion and the outer surface of the opening edge portion in the inner / outer direction of the box is wider. The foreign matter intrusion suppression unit is
The electrical connection box according to any one of claims 1 to 3, wherein an inner groove portion having a groove bottom lower than that of the fastening portion is provided between the fastening portion and the fitting groove. The electrical connection box according to claim 4, wherein the inner groove portion penetrates to the outside of the sealing edge portion. The electrical connection box according to claim 4 or 5, wherein the cover edge portion is provided with an inner groove fitting convex portion that fits into the inner groove portion. The electrical connection box according to any one of claims 1 to 6, wherein an outer groove portion having a groove bottom lower than that of the fastening portion is formed on the outer side of the box from the fastening portion. The electrical connection box according to claim 7, wherein an outer groove fitting convex portion that fits into the outer groove portion is provided on the cover edge portion. The foreign matter intrusion suppression unit is
Claimed, which is composed of a rough surface portion having a surface roughness coarser than the surface of the other portion, which is provided on at least one of the facing surfaces of the opening edge portion and the cover edge portion constituting the sealing edge portion. The electrical connection box according to any one of 1 to 8. The foreign matter intrusion suppression unit is
Of claims 1 to 9, the adhesive portion having adhesiveness provided on at least one of the facing surfaces of the opening edge portion forming the sealing edge portion and the cover edge portion facing each other. The electrical junction box described in either. The foreign matter intrusion suppression unit is
The electrical connection box according to any one of claims 1 to 10, which is provided in a fastening hole formed in a fastening portion at the opening edge and where the fastening material is fastened. The foreign matter intrusion suppression unit is
The electrical connection box according to claim 11, which is composed of an upper end recess formed on the peripheral edge of the upper end opening of the fastening hole. The foreign matter intrusion suppression unit is
The electrical connection box according to claim 11, which is formed on the peripheral edge of the upper end opening of the fastening hole and is formed of a tapered portion that gradually inclines upward in the diameter-expanding direction. The foreign matter intrusion suppression unit is
13. Electrical junction box. The foreign matter intrusion suppression unit is
The electrical connection box according to any one of claims 1 to 14, which is composed of an inner step portion whose fitting groove side is higher than the fastening portion. The foreign matter intrusion suppression unit is
The electrical connection box according to claim 15, which is formed inside the sealing edge portion and is formed of an internal space along the inner step portion. The electrical connection box according to any one of claims 1 to 16, wherein an outer step portion that lowers the outside of the box is formed on the outside of the box from the fastening portion. The foreign matter intrusion suppression unit is
The electrical connection box according to any one of claims 1 to 17, which is formed of an in-groove recess provided on the outer surface of the ring member on the bottom surface of the fitting groove. The foreign matter intrusion suppression unit is
The electrical connection box according to any one of claims 1 to 18, wherein the groove bottom surface in the fitting groove is an inclined bottom surface in which the outside of the box is lowered. The electrical connection box according to any one of claims 1 to 19, wherein the case body and the cover body are made of a metal material.

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