JP7316963B2 - Structure of fastening part - Google Patents

Description

The present invention relates to, for example, the structure of a fastening portion provided on a fixed body fixed to a fixed body.

For example, a vehicle such as an automobile is equipped with an electrical connection box for distributing power from a battery to each electronic device. This electric connection box houses an internal circuit including electronic parts such as a printed circuit board and bus bars.

In such an electric junction box mounted on a vehicle, as shown in Patent Document 1, for example, an insertion rod provided in an upper case (an object to be fixed) is inserted through a printed circuit board, an insulating plate, or the like, and a lower case is provided. It abuts against the fastening part of (fixed body). The fixed body and the fixed body are fastened and fixed by inserting a screw through the fastening portion from the outside of the fixed body and screwing the fastening portion and the insertion rod.

The structure of the fastening portion for fastening and fixing the fixed body and the fixed body in this way is generally not limited to the electric connection box, and generally has a concave shape that protrudes from the surface of the fixed body toward the fixed body side. It is composed of a cylindrical portion with a bottom having a bottom portion for arranging a fastening jig such as a screw.

By the way, the electrical connection box in which the fixed body and the fixed body are fastened and fixed in this manner may be mounted on the vehicle so that the direction of insertion of the screw in the fastening portion is oriented in the front-rear direction or the vehicle width direction of the vehicle. . In such a case, with the structure of the fastening portion as described above, there is a risk that water will enter the tubular portion when the vehicle is running in the rain or when the vehicle is washed. This applies not only to electrical junction boxes mounted on vehicles, but also to box bodies placed in places where there is a risk of water intrusion.

JP 2012-165590 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure of a fastening portion capable of draining water that has entered a tubular portion into which a fastening jig for fastening and fixing a fixed body and a fixed body is inserted. and

The present invention relates to a structure of a fastening portion provided on the fixed body for fastening by inserting a fastening jig for fixing the fixed body to the fixed body, the fastening portion being recessed from the surface of the fixed body, A bottomed cylindrical cylindrical portion having a bottom portion for arranging the fastening jig, and a groove portion provided in a part of the cylindrical portion in the circumferential direction and concave radially outward with respect to the inner surface of the cylindrical portion. The groove is formed so that the depth of the groove increases from the front side to the rear side in the insertion direction of the fastening jig, and the fixed body to which the fixed body is fixed is formed on the lower side in the mounted state in which the is mounted on the vehicle body.

A single or a plurality of the grooves may be provided on the inner surface of the cylindrical portion.
Further, the groove includes a rectangular shape, an arc shape, a triangular shape, a polygonal shape, etc. when viewed from the insertion direction.

The depth of the groove described above refers to the length from the inner surface of the tubular portion toward the radially outer side, and the groove portion extends from the front side toward the rear side in the insertion direction of the fastening jig. is configured to be longer.

According to the present invention, it is possible to drain water that has entered the tubular portion into which the fastening jig for fastening and fixing the fixed body and the fixed body is inserted.
More specifically, when mounted on a vehicle body, the groove formed by recessing the inner surface of the tubular portion downward increases in depth from the front side toward the rear side in the insertion direction of the fastening jig. It's becoming Therefore, even if water enters the cylindrical portion, the water can flow along the groove to the surface side of the fixed body and be discharged to the outside.

As an aspect of the present invention, the groove portion may taper downward in the mounted state.
According to the present invention, since the volume of the groove is reduced, the speed of water flowing through the groove can be increased. As a result, water can efficiently flow to the surface side of the fixed portion along the groove, so that water that has entered the tubular portion can be efficiently discharged to the outside.

Further, as an aspect of the present invention, the groove portion is positioned between two intersections of two directions perpendicular to each other and the outer edge of the cylindrical portion when viewed from the insertion direction of the fastening jig, and is located on the lower side of the intersection. may be provided in
According to the present invention, the cylindrical portion can be used for positioning the fixed body when assembling an electronic component such as a fuse to the fixed body.

More specifically, since the groove is provided between the intersections of the two directions corresponding to the two axes perpendicular to each other, when performing positioning for assembling an electronic component such as a fuse with respect to the fixed body, the cylindrical portion The positioning jig to be inserted into can contact the inner surface of the cylindrical portion at four points.

Accordingly, it is possible to prevent the fixed body from moving along two mutually orthogonal axes during positioning. Therefore, when assembling an electronic component such as a fuse to the fixed body, positioning can be performed using the cylindrical portion, and the electronic component such as the fuse can be placed in a predetermined position by fixing the fixed body at a desired position. can be assembled.

Further, as an aspect of the present invention, the tubular portion may be formed in a circular shape when viewed from the insertion direction of the fastening jig, and the groove portion may include a straight portion extending along the tangential direction from the intersection.
According to the present invention, water can be reliably discharged, and positioning can be performed reliably using the cylindrical portion.

More specifically, by providing a straight portion along the tangential direction from the intersection, the groove can be formed at a position away from the intersection. For this reason, the groove is not arranged at the portion of the cylindrical portion that contacts the positioning jig, and when the positioning jig is inserted into the cylindrical portion, the grooves are not aligned at the intersection of the two axes perpendicular to each other and the cylindrical portion. The positioning jig can be reliably brought into contact. That is, since the positioning jig can be reliably brought into contact with the inner surface of the tubular portion, it is possible to more reliably fix the fixed body at a desired position using the tubular portion. As a result, an electronic component such as a fuse can be more reliably attached to the fixed body at a desired position.

Moreover, the groove can be formed below the intersection by providing the groove with a straight portion extending in the tangential direction from the intersection. Therefore, the water that has entered the cylindrical portion can be reliably discharged to the outside by being transmitted to the groove portion formed on the lower side.

Since the groove has a linear portion extending along the tangential direction from the intersection of the two axes perpendicular to each other, it is possible to reliably assemble an electronic component such as a fuse at a desired position without adding a new structure. In addition, water that has entered the cylindrical portion can be reliably discharged to the outside.

Further, as a mode of the present invention, the surface of the fixed body may be provided with a convex portion projecting in a direction opposite to the insertion direction of the fastening jig above the cylindrical portion in the mounted state.
According to the present invention, when the object to be fixed is mounted on the vehicle body, water flowing from above the tubular portion can be applied to the convex portion, so that the tubular portion can be prevented from being flooded with water. As a result, even if a large amount of water runs along the fixed body, the amount of water that enters the cylindrical portion can be reduced. Therefore, even if water enters the cylindrical portion, it is possible to prevent the water from accumulating in the cylindrical portion and to discharge the water to the outside.

Moreover, as a mode of this invention, the recessed part recessed in the insertion direction of the said fastening jig may be provided in the radially outer side of the said cylindrical part.
According to the present invention, when the body to be fixed is mounted on the vehicle body, water flowing from above the tubular portion can be guided downward along the concave portion, thereby suppressing water intrusion into the tubular portion. can be done. Accordingly, even if water reaches the fixed body, the amount of water entering the cylindrical portion can be reduced. Therefore, even if water enters the cylindrical portion, it is possible to prevent the water from accumulating in the cylindrical portion and to discharge the water to the outside.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a fastening structure capable of discharging water that has entered a cylindrical portion in which a fastening jig for fastening and fixing a fixed body and a fixed body is arranged. can be done.

1 is a schematic perspective view of an electric junction box mounted on a vehicle; FIG. FIG. 2 is a schematic exploded perspective view of an electrical connection box; The bottom view of a lower case. The schematic perspective view of a cylindrical part and a groove part. AA cross-sectional view in FIG. BB arrow sectional view in FIG. CC arrow sectional view in FIG. FIG. 4 is a schematic perspective view showing an arrangement state of the lower case with respect to the positioning jig; The enlarged bottom view which showed the contact point of a positioning jig and a cylindrical part.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
The electrical connection box 1 of this embodiment is mounted, for example, near the dashboard in the engine room of a vehicle. A fastening structure 40 for fastening and fixing the lower case 10 and the upper case 20 that constitute such an electric junction box 1 will be described with reference to FIGS. 1 to 9. FIG.

FIG. 1 shows a schematic perspective view of the electric connection box 1 as it is mounted on a vehicle, viewed from the upper rear side, FIG. 2 shows a schematic exploded perspective view of the electric connection box 1 seen from the upper rear side, and FIG. shows a bottom view showing the bottom surface of the lower case 10. FIG. 4 shows a schematic enlarged perspective view of the cylindrical portion 41 and the groove portion 42 provided on the bottom surface 12 of the lower case, FIG. 5 shows a cross-sectional view taken along line AA in FIG. 3, and FIG. FIG. 7 shows a cross-sectional view taken along line B, and FIG. 7 shows a cross-sectional view taken along line CC in FIG.
FIG. 9 shows a schematic perspective view of the arrangement of the lower case 10 with respect to the positioning jig J as seen from the direction of the lower case bottom surface 12, and FIG. 9 shows an enlarged bottom view showing the contact points between the cylindrical portion 41 and the positioning pin J1.

3 and 4 will be described in detail.
3(a) shows an overall bottom view showing the entire bottom surface of the lower case 10, and FIG. 3(b) shows an enlarged partial bottom view showing the lower right portion of the lower case 10 in FIG. 3(a). 8 shows an enlarged bottom view of the same position as FIG. 3(b).

FIG. 4 is a schematic enlarged perspective view for explaining the cylindrical portion 41 and the groove portion 42 of the fastening structure 40 provided on the bottom surface 12 of the lower case. In addition, in FIG. 4, in order to clarify the configuration of the cylindrical portion 41 and the groove portion 42, illustration of the projecting portion 43 and the suppression groove 44 is omitted. In addition, the back side portion of the lower case bottom surface 12, which is not visible from the rear side Hb, is indicated by a dotted line, but the first linear portion 42a and the second linear portion 42b are actually indicated in order to clarify the structure. .

Here, the vertical direction in FIG. The direction connecting the lower left and the upper right in FIG.

In addition, in the vertical direction Z, the upper side is the upper side Zu, and the lower side is the lower side Zd. In the vehicle width direction W, the front side (lower right side in FIG. 1) is the right side Wr, and the back side (upper left side in FIG. 1) is the left side Wl. In the front-rear direction H, the back side (upper right side in FIG. 1) is referred to as the front side Hf, and the front side (lower left side in FIG. 1) is referred to as the rear side Hb.
For convenience, the directions shown in FIG. 1 are the same as those shown in FIGS.

The electric connection box 1 is mounted in the vicinity of the dashboard (not shown), which is a partition plate between the engine room and the vehicle compartment, as described above. Electronic parts such as fuses and bus bars are housed inside the electrical connection box 1 . This electronic component is electrically connected to a battery or other electronic equipment mounted on the vehicle, or to electronic equipment arranged in the vehicle interior.

The electric connection box 1 will be described in detail. As shown in FIGS. 1 and 2, the electrical junction box 1 is a housing configured in a substantially rectangular shape. and a printed circuit board 30 to be housed in the .

The lower case 10 has a substantially hollow box shape with an open front side Hf, and has a space inside for accommodating a printed circuit board 30 on which electronic components are to be assembled. The outer shape of the lower case 10 when viewed from the front-rear direction H is substantially rectangular.

The lower case 10 is composed of a lower case side surface 11 forming a side surface of the lower case 10 and a lower case bottom surface 12 forming a bottom surface. there is

The connector connecting portion 13 is configured such that a connector connected to one end of a wire harness (not shown) can be attached and detached. By connecting a connector to the connector connection portion 13 configured in this manner, an electronic device connected to the other end of the wire harness and an electronic component such as a fuse mounted on a printed circuit board 30 to be described later can be electrically connected. can be connected.

The lower case bottom surface 12 is configured to have a substantially rectangular shape when viewed in the front-rear direction H, and a fastening structure 40 for fastening and fixing the lower case 10 and the upper case 20 using fastening screws B is provided at each corner portion. is provided.

The fastening structure 40 is composed of a cylindrical portion 41, a groove portion 42, a projecting portion 43, and a restraining groove 44, as shown in FIGS.
As shown in FIGS. 3 to 7, the cylindrical portion 41 protrudes forward from the bottom surface 12 of the lower case 12 and includes a cylindrical main body 41a and a reduced diameter portion 41b forming an inner peripheral surface having a predetermined inner diameter, and a cylindrical portion. It is integrally formed with a cylindrical bottom portion 41c that constitutes the bottom surface of 41. As shown in FIG. It should be noted that the cylindrical portion 41 has substantially the same thickness as the plate thickness of the lower case bottom surface 12 .

As shown in FIGS. 4 to 7, the cylindrical main body 41a is a cylindrical body having a predetermined inner diameter and outer diameter, and protrudes from the lower case bottom surface 12 toward the front side Hf by a predetermined length. The inner diameter of the cylindrical main body 41a is configured to be slightly larger than the outer diameter of the head of the fastening screw B that fastens and fixes the lower case 10 and the upper case 20 together.

The diameter-reduced portion 41b is a cylindrical tubular body extending from the end of the cylindrical main body 41a on the front side Hf to the front side Hf. The reduced diameter portion 41b has an inner diameter equal to the inner diameter of the cylindrical main body 41a and an outer diameter smaller than the outer diameter of the cylindrical main body 41a. The height (the length in the front-rear direction H) of the reduced-diameter portion 41b is substantially the same as the thickness of the printed circuit board 30, which will be described later.

As shown in FIGS. 4 to 7, the cylindrical bottom surface portion 41c is the bottom surface of the cylindrical portion 41 provided at the end of the front side Hf of the reduced diameter portion 41b. A through hole S is provided to penetrate along the thickness direction (the front-rear direction H). In addition, the outer diameter of the through hole S is configured to be slightly larger than the outer diameter of the screw portion of the fastening screw B. As shown in FIG.
A fastening screw B can be inserted along the front-rear direction H into the cylindrical portion 41 configured in this manner.

As shown in FIGS. 3 to 7, the groove portion 42 is a groove in which the inner peripheral surfaces of the cylindrical main body 41a and the diameter-reduced portion 41b of the cylindrical portion 41 are recessed radially outward (lower side Zd in the present embodiment). It is provided on the lower side Zd in the circumferential direction of the cylindrical portion 41 when viewed from the front-rear direction H. As shown in FIG.

Specifically, as shown in FIG. 3B, the groove portion 42 is positioned below the right intersection P1 where the first virtual line X and the second virtual line Y perpendicular to each other intersect the end of the cylindrical portion 41 on the rear side Hb. It is provided between the side intersection Q1.

The first virtual line X and the second virtual line Y are virtual lines represented by dotted lines in FIG. 3, and correspond to the width direction L and the depth direction D of the lower case 10 in positioning the lower case 10 (FIG. 8). and FIG. 9). Further, in the present embodiment, the first virtual line X and the second virtual line Y are straight lines along the vehicle width direction W and the vertical direction Z when mounted on the vehicle.

In the present embodiment, the right intersection P1 is the intersection on the right side Wr among the intersections (the right intersection P1 and the left intersection P2) between the outer edge of the cylindrical body 41a and the first imaginary line X. The lower intersection Q1 is the lower intersection Zd of the intersections (lower intersection Q1, upper intersection Q2) between the outer edge of the cylindrical body 41a and the second imaginary line Y (see FIG. 3B).

This groove portion 42 will be described in more detail.
As shown in FIGS. 3B and 4, the groove portion 42 is integrated with a first straight portion 42a, a second straight portion 42b, and a groove body portion 42c connected to the cylindrical main body 41a and the second straight portion 42b. is configured to

The first linear portion 42a is composed of a substantially right-angled triangular flat surface that tapers toward the front side Hf, and when viewed from the front-rear direction H, the end of the rear side Hb is the vertex of the right side Wr of the cylindrical portion 41. It extends linearly from the right intersection P1 toward the lower side Zd. The length of the first linear portion 42 a on the rear side Hb is half the outer diameter of the cylindrical portion 41 .

The second linear portion 42b is composed of a substantially right-angled triangular flat surface that tapers toward the front side Hf, and when viewed from the front-rear direction H, the end of the rear side Hb is the vertex of the lower side Zd of the cylindrical portion 41. It extends linearly from the lower intersection Q1 toward the right side Wr. That is, the second linear portion 42b extends along the vehicle width direction W from the lowest portion of the cylindrical portion 41 in the mounted state in which the electric connection box 1 is mounted on the vehicle. The length of the first linear portion 42a on the rear side Hb is half the outer diameter of the cylindrical portion 41 when viewed from the front-rear direction H. As shown in FIG.

The groove body portion 42c is an arcuate groove recessed downward Zd from the end of the first linear portion 42a on the lower side Zd and the end of the right side Wr of the second linear portion 42b. That is, the groove body portion 42c is provided on the lower side Zd than the lowest portion of the cylindrical portion 41 when viewed in the front-rear direction H. As shown in FIG.

As shown in FIGS. 4 and 5, the groove main body portion 42c is inclined downward Zd toward the rear side Hb.
More specifically, the first straight portion 42a includes a front right vertex P3 that is the vertex of the right side Wr of the cylindrical bottom portion 41c, and a first lower point P4 that is the lowest point of the first straight portion 42a when viewed from the front-rear direction H. and the right intersection P1 form a right-angled triangle (see FIG. 4).

The second linear portion 42b has a front lower vertex Q3 that is the vertex of the lower side Zd of the cylindrical bottom surface portion 41c, and a second end point Q4 that is the end of the right side Wr of the second linear portion 42b as seen from the front-rear direction H. and the lower intersection Q1 form a right-angled triangle (see FIG. 4).

The groove main body portion 42c has an arc-shaped groove that gradually protrudes downward Zd from an arc connecting the front right vertex P3 and the front lower vertex Q3 of the cylindrical bottom surface portion 41c toward the rear side Hb. Configure. That is, the groove main body portion 42c is formed in an arcuate shape that tapers toward the lower side Zd, and is inclined radially inward of the cylindrical portion 41 toward the front side Hf. The front end Hf of the groove body 42c is connected to the cylindrical bottom surface 41c (see FIGS. 4 and 5).
Further, the vertical distance L1 of the lowest point of the groove main body portion 42c with respect to the second straight portion 42b on the surface portion of the lower case bottom surface 12 is about a quarter of the outer diameter of the cylindrical portion 41. As shown in FIG.

3 and 6, the protrusion 43 is a rib that protrudes rearward Hb from the lower case bottom surface 12 on the upper side Zu of the cylindrical portion 41, and extends toward the upper side Zu as viewed in the front-back direction H. It is configured in a convex circular arc shape. The end of the arc of the projecting portion 43 is arranged at substantially the same position as the outer end of the cylindrical portion 41 in the vehicle width direction W. As shown in FIG. The upper end vertex of the projecting portion 43 coincides with the upper end side (upper Zu) vertex of the cylindrical portion 41 .

As shown in FIGS. 3 and 7, the restraint groove 44 is a groove recessed toward the front side Hf on the radially outer side from the apexes of the right side Wr and the left side Wl of the cylindrical portion 41 when viewed in the front-rear direction H. . The suppression groove 44 has an arcuate upper portion along the outer edge of the cylindrical portion 41 and a linear lower portion along the vertical direction Z when viewed from the front-rear direction H. As shown in FIG. The distance between the cylindrical portion 41 and the suppression groove 44 is substantially equal to the distance between the cylindrical portion 41 and the projecting portion 43 .

The upper case 20, which constitutes the electrical junction box 1 together with the lower case 10 configured as described above, is a lid of the electrical junction box 1 configured to cover the opening on the front side Hf of the lower case 10. As shown in FIG.
More specifically, as shown in FIG. 2, the upper case 20 is formed in a substantially hollow box-like shape with the rear side Hb opened. A to-be-fastened portion 50 is provided at a position corresponding to the cylindrical portion 41 .

The fastened portion 50 is a cylindrical body projecting from the inner surface of the upper case 20 toward the rear side Hb. More specifically, the fastened portion 50 is a cylindrical body having substantially the same outer diameter as the cylindrical main body 41a, and has a fastening screw B through which the projecting portion 43 is inserted at the center portion of the bottom surface formed on the rear side Hb side. is provided with a threaded hole for screwing the

The printed circuit board 30 is an insulating plate-like body, and the surface thereof is provided with an electronic circuit in which electronic components such as fuses and resistors to be housed inside the electric connection box 1 are assembled. The printed circuit board 30 also has a connecting portion (not shown) for electrically connecting the electronic circuit and the connector connecting portion 13 .

For this reason, the electronic circuit provided on the printed circuit board 30 and the electronic equipment are electrically connected via a wire harness having a connector connectable to the connector connecting portion 13 at one end and having the other end connected to the electronic equipment. can be connected to

As shown in FIG. 2, the printed circuit board 30 on which the electronic circuit is provided is provided with a placement hole 31 at a position corresponding to the fastening structure 40 and the fastened portion 50 when housed in the electric connection box 1 . It is The arrangement hole 31 is a through hole penetrating along the plate thickness direction, and its outer diameter is configured to have substantially the same length as the outer diameter of the reduced diameter portion 41b.

The lower case 10 and the upper case 20 configured in this manner are fastened and fixed with the printed circuit board 30 accommodated therein by screwing the fastening structure 40 and the fastened portion 50 with fastening screws B. can be done. This electrical connection box 1 can discharge water that has entered the cylindrical portion 41 in a state of being mounted on a vehicle.

Hereinafter, a brief description will be given of the flow of water when water enters the cylindrical portion 41 in the state where the electric connection box 1 is mounted on the vehicle.
The electrical connection box 1 is mounted in the vicinity of the dashboard in the engine room so that the lower case bottom surface 12 faces the front side Hf, which is the rear of the vehicle, and the connector connecting portion 13 is arranged on the right side Wr. That is, when the electric connection box 1 is mounted on the vehicle, the groove portion 42 provided on the inner peripheral surface of the cylindrical portion 41 is arranged on the lower side Zd.

Here, when viewed from the front-rear direction H, the lower intersection Q1, which is the intersection of the cylindrical portion 41 and the second imaginary line Y, is the lowest point on the rear side Hb of the cylindrical portion 41 . The groove portion 42 extends from the right Wr end of the second straight portion 42b linearly extending from the lower intersection Q1 toward the right Wr, and from the lower Zd end of the first straight portion 42a to the lower Zd. It has a groove body portion 42c that is recessed toward. Therefore, the groove bottom of the groove main body portion 42c is arranged below the lowest point of the cylindrical portion 41 Zd. Further, the depth of the groove portion 42 increases from the cylindrical bottom surface portion 41c toward the rear side Hb.
Therefore, the water that has entered the cylindrical portion 41 moves along the inner peripheral surface of the cylindrical portion 41 to the groove portion 42 and flows along the inner peripheral surface of the groove portion 42 to the outside and is discharged.

The fastening structure 40 provided on the lower case bottom surface 12 can also be used for positioning the lower case 10 so that electronic components such as fuses can be arranged at desired positions with respect to the printed circuit board 30 .
Positioning of the lower case 10 using the fastening structure 40 will be briefly described below with reference to FIGS. 8 and 9. FIG.

First, the positioning jig J for positioning the lower case 10 will be briefly described.
As shown in FIG. 7, the positioning jig J includes a plurality of positioning pins J1 having a rectangular cross section.

The positioning pin J1 is a cylinder having substantially the same outer diameter as the cylindrical portion 41 and is arranged at a position corresponding to the cylindrical portion 41 provided on the lower case bottom surface 12 . In this embodiment, four J1 are provided so as to correspond to the fastening structure 40, but the number is not limited to four and may be two or three.

The lower case 10 is positioned so that the fastening structure 40 corresponds to the positioning pin J1 configured in this way, and the positioning pin J1 is inserted into the fastening structure 40 to position the lower case 10 (see FIG. 8).

Here, in the fastening structure 40 arranged on the right side Wr, the groove portion 42 is arranged on the right side Wr when viewed from the front-rear direction H, as shown in FIG. As described above, the groove portion 42 has the first straight portion 42a extending downward Zd from the right intersection P1 and the second straight portion 42b extending from the lower intersection Q1.

Therefore, when the positioning pin J1 having the same outer diameter as the outer diameter of the cylindrical portion 41 is inserted, the first virtual line X and the second virtual line Y perpendicular to each other intersect the cylindrical portion 41 at four points (quarter points). ), the cylindrical portion 41 and the positioning pin J1 are brought into contact (see FIG. 9). Therefore, rattling in the width direction L and the depth direction D can be reliably prevented, and the lower case 10 can be accurately positioned at a desired position.

Since the fastening structure 40 can be accurately positioned at a desired position in this manner, the printed circuit board 30 can be arranged at a desired position with respect to the fastening structure 40 . Therefore, electronic components can be arranged at desired positions on the printed circuit board 30 .
In addition, since the lower case 10 can be accurately positioned in this manner, the electronic components can be placed on the printed circuit board 30 by a machine, and the electronic components can be accurately placed while improving work efficiency. .

As described above, the fastening structure 40 is provided on the lower case 10 for fastening by inserting the fastening screw B for fixing the lower case 10 to the upper case 20 . The fastening structure 40 includes a cylindrical portion 41 having a bottomed cylindrical portion 41c, which is recessed from the lower case bottom surface 12 of the lower case 10 and has a cylindrical bottom surface portion 41c in which the fastening screw B is arranged, and a part of the cylindrical portion 41 in the circumferential direction. and a groove portion 42 that is concave radially outward with respect to the inner surface of the cylindrical portion 41 . The groove portion 42 is formed so that the depth of the groove increases from the front side Hf toward the rear side Hb in the longitudinal direction H of the fastening screw B, and the upper case 20 to which the lower case 10 is fixed is attached to the vehicle body. It is characterized in that it is formed on the lower side Zd in the mounted state.

As a result, water that has entered the cylindrical portion 41 into which the fastening screw B that fastens and fixes the lower case 10 and the upper case 20 is inserted can be discharged.
More specifically, the grooves 42 formed in the cylindrical main body 41a and the reduced-diameter portion 41b in the state of being mounted on the vehicle body are arranged on the lower side Zd of the cylindrical portion 41, and extend from the front side Hf in the front-rear direction H to the rear side. The depth of the groove increases toward the side Hb. Therefore, even if water enters the cylindrical portion 41, the water can flow along the groove portion 42 to the lower case bottom surface 12 of the lower case 10 and be discharged to the outside.

Further, since the groove 42 is tapered toward the lower side Zd in the mounted state, the volume of the groove 42 can be reduced. Therefore, the speed of the water flowing through the groove 42 is increased, the water can efficiently flow along the groove 42 to the surface side of the fixed portion, and the water that has entered the cylindrical portion 41 can be efficiently discharged to the outside. can be done.

Furthermore, the groove portion 42 is formed by intersections (right intersection P1, left intersection P1, left Among the intersection P2, the lower intersection Q1, and the upper intersection Q2), it is provided between the right intersection P1 and the lower intersection Q1 arranged on the lower side Zd. Thereby, when assembling an electronic component such as a fuse to the lower case 10 , the cylindrical portion 41 can be used for positioning the lower case 10 .

More specifically, the groove 42 is provided between the right intersection P1 and the lower intersection Q1 of two axes (first virtual line X and second virtual line Y) that are perpendicular to each other. Therefore, when performing positioning for mounting an electronic component such as a fuse to the lower case 10, the positioning pin J1 inserted into the cylindrical portion 41 and the inner peripheral surface of the cylindrical portion 41 can be brought into contact at four points.

As a result, the lower case 10 can be prevented from moving along the width direction L and the depth direction D corresponding to the two positioning axes (the first virtual line X and the second virtual line Y). Positioning can be performed using the cylindrical portion 41 when assembling electronic components such as. Therefore, the lower case 10 can be fixed at a desired position, and an electronic component such as a fuse can be assembled at the predetermined position.

As described above, the electrical connection box 1 is provided with the fastening structure 40, so that water that has entered the fastening structure 40 can be reliably discharged, and the electronic components can be assembled to the lower case 10 without adding a new configuration to the lower case 10. positioning can be performed.

In addition, the cylindrical portion 41 is formed in a circular shape when viewed in the front-rear direction H, and the groove portion 42 includes a first linear portion 42a and a first linear portion 42a extending along the tangential direction from intersections (the right intersection P1 and the lower intersection Q1). It has two straight portions 42b. As a result, water that has entered the fastening structure 40 can be reliably discharged, and the cylindrical portion 41 can be used to reliably position the lower case 10 .

More specifically, by providing the first straight portion 42a and the second straight portion 42b along the tangential direction from the intersection (the right intersection P1 and the lower intersection Q1), the vehicle deviates from the intersection (the right intersection P1 and the lower intersection Q1). A groove 42 can be formed at the position where the groove 42 is located. As a result, the groove portion 42 is not arranged at the portion of the cylindrical portion 41 that contacts the positioning pin J1. Therefore, when the positioning pin J1 is inserted into the cylindrical portion 41, the positioning pin J1 is inserted at the intersections of the cylindrical portion 41 and the two directions orthogonal to each other (the right intersection P1, the left intersection P2, the lower intersection Q1, and the upper intersection Q2). can be contacted.

That is, since the positioning pin J1 can be reliably brought into contact with the inner peripheral surface of the cylindrical portion 41, the lower case 10 is fixed at a desired position using the cylindrical portion 41, and an electronic component such as a fuse is attached to the lower case 10. It can be assembled in any desired position.

In addition, the groove portion 42 includes a first straight portion 42a and a second straight portion 42b extending along the tangential direction from the intersections (the right intersection P1 and the lower intersection Q1). The groove body portion 42c can be formed on the lower side Zd. Therefore, the water that has entered the cylindrical portion 41 can be transmitted to the groove portion 42 formed on the lower side Zd and can be reliably discharged to the outside.

Thus, the groove 42 has a first straight portion 42a and a second straight portion 42b extending along the tangential direction from the crossing points (the right side crossing point P1 and the bottom side crossing point Q1) of the two directions perpendicular to each other. Therefore, electronic components such as fuses can be reliably assembled at desired positions without adding new structures, and water that has entered the cylindrical portion 41 can be reliably discharged to the outside.

Further, the lower case bottom surface 12 of the lower case 10 is provided with a protruding portion 43 protruding in the direction opposite to the insertion direction of the fastening screw B above the cylindrical portion 41 in the mounted state. As a result, when the upper case 20 is mounted on the vehicle body, the water flowing from above the cylindrical portion 41 can hit the protruding portion 43, suppressing the ingress of water into the cylindrical portion 41 and preventing a large amount of water from flowing into the lower case. 10, the amount of water entering the cylindrical portion 41 can be reduced. Therefore, even if water enters the cylindrical portion 41, it is possible to prevent the water from accumulating in the cylindrical portion 41, and the water can be more reliably discharged to the outside.

Furthermore, a restraining groove 44 recessed in the insertion direction of the fastening screw B is provided on the radially outer side of the cylindrical portion 41, so that when the upper case 20 is mounted on the vehicle body, the upper case 20 can be viewed from above the cylindrical portion 41. Flowing water can escape along the suppression groove 44. - 特許庁As a result, it is possible to suppress the ingress of water into the cylindrical portion 41 , and the amount of water entering the cylindrical portion 41 even if it travels along the lower case 10 can be reduced. Therefore, even if water enters the cylindrical portion 41, it is possible to prevent the water from accumulating in the cylindrical portion 41 and to reliably discharge the water to the outside.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiments, the fixed body corresponds to the lower case 10, and so on.
The fixed body corresponds to the upper case 20,
The fastening jig corresponds to the fastening screw B,
The structure of the fastening part corresponds to the fastening structure 40,
The tubular portion corresponds to the cylindrical portion 41,
The groove corresponds to the groove 42,
The linear portion corresponds to the first linear portion 42a and the second linear portion 42b,
The convex portion corresponds to the projecting portion 43,
The recesses correspond to the restraining grooves 44, but the invention is not limited only to the configurations of the above-described embodiments, and many embodiments can be obtained.

For example, in the present embodiment, the groove portion 42 is configured to be concave radially outward at one location with respect to the cylindrical main body 41a and the reduced diameter portion 41b. may be provided.

In addition, in the present embodiment, the groove portion 42 is formed in an arc shape projecting downward Zd when viewed in the front-rear direction H, but the shape is not limited to this. Specifically, for example, it may have a polygonal shape such as a rectangular shape or a triangular shape.

Further, in the present embodiment, the fastening structure 40 is provided on the lower case 10 of the electric connection box 1, but it is not necessarily provided on the lower case 10, and may be provided on the upper case 20, for example. Furthermore, instead of the electrical connection box 1, it may be provided on a housing for the purpose of preventing water from entering the inside, or on a cover for forming an internal space.

10 Lower case 20 Upper case 40 Fastening structure 41 Cylindrical part 42 Groove part 42a First straight part 42b Second straight part 43 Protruding part 44 Restriction groove B Fastening screw Zd Lower side

Claims (6)

A structure of a fastening portion provided in the fixed body for fastening by inserting a fastening jig for fixing the fixed body to the fixed body,
a cylindrical portion with a bottom that is recessed from the surface of the fixed body and has a bottom portion for arranging the fastening jig;
and a groove portion provided in a part of the cylindrical portion in the circumferential direction and having a concave shape radially outward with respect to the inner surface of the cylindrical portion,
The groove is
The groove is formed so that the depth of the groove increases from the front side to the rear side in the insertion direction of the fastening jig, and the lower side of the mounting state in which the fixed body to which the fixed body is fixed is mounted on the vehicle body The structure of the fastening part formed on the side. 2. The fastening portion structure according to claim 1, wherein said groove portion tapers downward in said mounted state. 2. The groove is provided between two intersections of two directions perpendicular to each other and the outer edge of the cylindrical portion when viewed from the insertion direction of the fastening jig, the intersection being disposed on the lower side. Or the structure of the fastening part according to claim 2. The tubular portion is formed in a circular shape when viewed from the insertion direction of the fastening jig,
4. The structure of the fastening portion according to claim 3, wherein the groove has a straight portion extending tangentially from the intersection. 5. The surface of the fixed body is provided with a convex portion projecting in a direction opposite to an inserting direction of the fastening jig above the tubular portion in the mounted state. The structure of the fastening part described in . 6. The fastening portion structure according to any one of claims 1 to 5, wherein a concave portion recessed in the insertion direction of the fastening jig is provided on the radially outer side of the cylindrical portion.

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