JP7316964B2 - 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. Many of them are composed of a cylindrical portion with a bottom having a bottom on which a fastening jig such as a screw is arranged.

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.

JP 2012-165590 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure of a fastening portion that can prevent water from entering a tubular portion into which a fastening jig for fastening and fixing a fixed body and a fixed body is inserted. do.

The present invention relates to a structure of a fastening portion provided in a fixed body for fastening by inserting a fastening jig for fixing the fixed body to a fixed body, the fastening portion being recessed from the surface of the fixed body, the A bottomed tubular portion having a bottom on which a fastening jig is arranged; and a diameter-enlarging recess that gradually expands in diameter toward the surface of the fixed body from the rear end in the insertion direction of the part, and the diameter-enlarging recess is configured to move the fixed body to which the fixed body is fixed to the vehicle body. It is characterized in that it is formed on the lower side in the mounted state mounted on the .

It is sufficient that at least a portion of the diameter-enlarged concave portion is arranged on the lower side of the cylindrical portion when viewed from the direction in which the fastening jig is inserted in the mounted state. Or it may be provided along a portion.
In addition, the lower side refers to the lower half side of the center of the cylindrical portion when viewed from the insertion direction of the fastening jig in the mounted state.

Further, when the diameter-enlarged recess is provided in a portion of the surface-side end portion of the cylindrical portion, the diameter-enlarged recess may be singular or plural. For example, when viewed from the insertion direction of the fastening jig, they may be arranged at positions facing each other across the tubular portion, or may be irregularly arranged.

Further, the enlarged diameter concave portion may be formed in an arc shape along the outer edge of the tubular portion when viewed from the insertion direction of the fastening jig in the mounted state, or may be formed in a straight line shape.
Furthermore, in a cross section viewed in a direction orthogonal to the insertion direction, the diameter-enlarging recess is linear or arcuate, protruding in the insertion direction from the surface-side end of the cylindrical portion and the surface of the fixed body. , or a configuration in which they are connected by a stepped shape having a square shape or a recessed shape.

According to the present invention, it is possible to prevent water from entering the tubular portion into which the fastening jig for fastening and fixing the fixed body and the fixed body is inserted.
More specifically, since the outer edge of the surface-side end portion of the cylindrical portion is formed with a diameter-enlarging recess that connects the surface-side end portion of the cylindrical portion and the surface of the fixed body, the fixed body The water flowing on the surface can be transmitted to the diameter-enlarged concave portion and guided to the lower side than the cylindrical portion in the mounted state. Therefore, it is possible to prevent the water flowing through the fixed portion from entering the cylindrical portion when washing the car or driving in the rain, for example.

As an aspect of the present invention, the enlarged diameter concave portion may be provided along the entire circumference of the surface-side end portion of the cylindrical portion.
According to this invention, water flowing from the upper side of the cylindrical portion in the mounted state can be guided to the diameter-enlarged concave portion and guided to the lower side than the cylindrical portion. As a result, water flowing from above the cylindrical portion can be further suppressed from entering the cylindrical portion.

Further, as an aspect of the present invention, the diameter-enlarging recess may have a width along a radial direction with respect to the center of the cylindrical portion, viewed from the insertion direction, increasing downward in the mounted state. .
The width increasing toward the lower side in the mounting state described above includes the case where the width increases continuously or stepwise. Specifically, when viewed from the insertion direction, the enlarged diameter recess is configured in an elliptical shape that protrudes downward, or in a hexagonal or pentagonal shape that surrounds the outer edge of the cylindrical portion on the surface side. This may be the case.

According to the present invention, since the area of the diameter-enlarging recess increases as it goes downward in the mounted state, the water flowing on the surface of the fixed body is reliably transmitted to the diameter-enlarging recess in the mounted state, and flows from the cylindrical portion. can also be guided downward. Therefore, the water that has reached the concave and convex portions can be reliably flowed downward from the cylindrical portion, and the ingress of water into the cylindrical portion can be reliably suppressed.

Further, as an aspect of the present invention, the depth of the enlarged diameter concave portion on the same circumference with respect to the center of the tubular portion may be deeper as it goes downward in the mounted state.
According to the present invention, since the volume of the groove formed by the diameter-enlarging recess increases toward the lower side, it is possible to more reliably guide the water that has traveled to the diameter-enlarging recess to the lower side than the cylindrical portion in the mounted state. can. As a result, it is possible to more reliably prevent water from entering the cylindrical portion. In addition, since the volume of the groove formed by the diameter-enlarged concave portion increases downward, even if a large amount of water converges, the water can be guided downward from the cylindrical portion.

Further, as a mode of the present invention, the enlarged diameter concave portion may be provided with an extending groove portion extending downward from the outer edge in the mounted state and recessed in the insertion direction.
According to this invention, the water that has flowed through the diameter-enlarged recess can be guided along the extension groove toward the lower side in the mounted state. As a result, it is possible to reliably guide the water that has reached the diameter-enlarged recess further downward from the lower end side of the diameter-enlarged recess in the mounted state. In other words, the water that has reached the diameter-enlarged recess can be drained downward without accumulating on the lower end side.

Further, as a mode of the present invention, a protruding portion protruding in a direction opposite to the insertion direction may be provided on an upper side of the cylindrical portion in the mounted state.
Note that the upper side refers to the upper half side of the center of the tubular portion when viewed from the insertion direction of the fastening jig in the mounted state.

According to this invention, in the mounted state where the fixed body is mounted on the vehicle body, the water flowing from above the tubular portion can be applied to the projecting portion to change the direction in which the water flows. Therefore, it is possible to prevent water from directly entering the cylindrical portion.

Further, by making the water flowing on the surface of the fixed body hit the projecting portion, the direction of water flow can be changed and the water can be guided so as to be transmitted to the diameter-enlarged concave portion. Therefore, it is possible to more reliably prevent water from entering the cylindrical portion.

Further, as an aspect of the present invention, the depth of the groove of the enlarged diameter concave portion may gradually become shallower as it goes radially inward.
According to this invention, since the inclination of the diameter-enlarged recess is increased on the lower side, the water that reaches the diameter-enlarged recess flows more radially outward on the lower side. Therefore, it is possible to more reliably prevent water from entering the cylindrical portion.

INDUSTRIAL APPLICABILITY The present invention can provide a fastening structure capable of suppressing entry of water into a cylindrical portion in which a fastening jig for fastening and fixing a fixed body and a fixed body is arranged.

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. AA cross-sectional view in FIG. BB arrow sectional view in FIG. Explanatory drawing which showed the movement of the water droplet. Explanatory drawing which shows the structure of the fastening part in other embodiment. Explanatory drawing which shows the structure of the fastening part in other embodiment. Explanatory drawing which shows the structure of the fastening part in other embodiment. Explanatory drawing which shows the structure of the fastening part in other embodiment.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
The electrical connection box 1 of this embodiment is arranged, for example, in the vicinity of a dashboard in an engine room of a vehicle. A fastening structure 40 for fastening and fixing the lower case 10 and the upper case 20 that constitute the electric connection box 1 with fastening screws B will be described with reference to FIGS. 1 to 6. 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 cross-sectional view taken along the line AA in FIG. 3, and FIG. 5 shows a cross-sectional view taken along the line BB in FIG. FIG. 6 is an enlarged partial bottom view showing the movement path of water droplets on the lower case 10 when the electric connection box 1 is mounted on the vehicle.

7 to 10 show explanatory diagrams of another embodiment of the fastening structure 40, FIG. 7 shows a bottom view showing the bottom surface of the lower case 10 in another embodiment, and FIGS. 8 and 9 show other embodiments. shows a cross-sectional view taken along the line AA. FIG. 10 shows a bottom view showing the bottom surface of the lower case 10 in another embodiment.

3 to 5 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).

FIG. 4(a) shows a cross-sectional view taken along the line AA in FIG. 3(b), FIG. 4(b) shows an enlarged view of part α in FIG. 4(a), and FIG. An enlarged view of the β section in 4(a) is shown. Similarly, FIG. 5(a) shows a cross-sectional view taken along line BB in FIG. 3(b), FIG. 5(b) shows an enlarged view of the γ portion in FIG. ) shows an enlarged view of the Δ portion in FIG. 5(a).

7(a) and 7(b) show enlarged bottom views of other embodiments, respectively. 8(a) to 8(c) and FIGS. 9(a) to 9(c) are cross-sectional views taken along the line A--A of the position corresponding to FIG. 4 in another embodiment.

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.
Note that the directions shown in FIG. 1 are the same as those shown in FIGS. 2 to 10 for convenience.

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. Further, the lower case 10 has a substantially rectangular outer shape when viewed from the front-rear direction H.

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. It 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 from the front-rear direction H. As shown in FIG. A fastening structure 40 for fastening and fixing the lower case 10 and the upper case 20 with fastening screws B is provided at each corner portion of the lower case bottom surface 12 .

As shown in FIGS. 1 to 5, the fastening structure 40 is composed of a cylindrical portion 41, a diameter-enlarged concave portion 42, and a protruding portion 43. As shown in FIG.
The cylindrical portion 41 is a bottomed cylindrical body that protrudes from the lower case bottom surface 12 toward the front side Hf and has an opening on the rear side Hb. The cylindrical portion 41 is slightly recessed toward the front side Hf compared to the surface of the lower case bottom surface 12 .

As shown in FIGS. 3, 4, and 5, the cylindrical portion 41 protrudes forward from the bottom surface 12 of the lower case 12, and has a cylindrical main body 41a forming an inner peripheral surface having a predetermined inner diameter and a reduced diameter. The portion 41b and the cylindrical bottom surface portion 41c forming the bottom surface of the cylindrical portion 41 are integrally formed.

As shown in FIGS. 4 and 5, 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 and 5, 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.

As shown in FIGS. 3, 4, and 5, the enlarged diameter concave portion 42 connects the end of the cylindrical portion 41 on the surface side (rear side Hb) and the lower case bottom surface 12 of the lower case 10, and the cylindrical main body 41a. It is configured to gradually increase in diameter from the end portion on the rear side Hb toward the bottom surface 12 of the lower case. In other words, the enlarged diameter recess 42 increases in diameter from the center of the cylindrical portion 41 when viewed in the front-rear direction H, as viewed in the front-rear direction H, from the end of the cylindrical main body 41a on the rear side Hb toward the lower case bottom surface 12 . It is configured so that the width along the direction increases.

More specifically, as shown in FIG. 3, the diameter-enlarging recess 42 includes a semicircular upper diameter-enlarging recess 42a provided on the upper side Zu of the cylindrical portion 41 and an upper diameter-enlarging recess 42a provided on the lower side Zd of the cylindrical portion 41. A substantially semicircular downward enlarged diameter recess portion 42b and an extension groove portion 42c extending from the lower end of the enlarged diameter recess portion 42 toward the downward side Zd are integrally formed.

As shown in FIGS. 3, 4, and 5, the upper enlarged diameter concave portion 42a is recessed toward the front side Hf on the upper side (upper side Zu) of the center of the cylindrical portion 41 when viewed in the front-rear direction H. It is a groove with an arcuate cross section. In addition, the upward enlarged diameter concave portion 42a is configured to have a semicircular shape that protrudes upward when viewed from the front-rear direction H. As shown in FIG.

As shown in FIGS. 4(c), 5(b), and 5(c), the upward diameter-enlarged concave portion 42a becomes deeper as it goes radially inward, and becomes gentler as it goes radially inward. It is configured to have an arcuate cross section. Further, the upper enlarged diameter concave portion 42a is configured such that the depth on the same circumference with respect to the center of the cylindrical portion 41 when viewed in the front-rear direction H becomes deeper toward the lower side Zd.

As shown in FIGS. 3, 4, and 5, the downward enlarged diameter concave portion 42b is recessed toward the front side Hf below the center of the cylindrical portion 41 (lower side Zd) when viewed in the front-rear direction H. It is a groove with an arcuate cross section. In addition, the downward enlarged diameter concave portion 42b is configured to have a substantially semicircular shape projecting downward when viewed from the front-rear direction H. As shown in FIG.

As shown in FIGS. 3 and 4(b), the downward expanding concave portion 42b has a depth (the length of the front side Hf) that increases radially inward, and gradually increases radially inward. It is configured to have an arcuate cross section. As shown in FIGS. 3 and 4B, the diameter-enlarged concave portion 42b expands radially outward toward the downward side Zd, and the depth of the radially inner end portion (front side Hf length) is configured to be deep. Further, the downward enlarged diameter concave portion 42b is configured such that the depth on the same circumference with respect to the center of the cylindrical portion 41 when viewed in the front-rear direction H becomes deeper toward the downward side Zd.

As shown in FIGS. 3 and 4(b), the extending groove portion 42c is formed at the confluence of the downward enlarged diameter concave portion 42b provided toward the downward side Zd from the end portion of the downward side Zd in the vertical direction Z of the cylindrical portion 41. part, it is a recess extending toward the lower side Zd. In other words, the enlarged diameter concave portion 42 has an extending groove portion 42c along the vertical direction Z at the outer edge of the lower side Zd in the vertical direction Z of the cylindrical portion 41, which gradually becomes shallower toward the lower side Zd.

The protruding portion 43 is an arc-shaped rib that protrudes rearward Hb from the lower case bottom surface 12 on the upper side Zu of the cylindrical portion 41 and protrudes upward when viewed in the front-rear direction H. Both ends of the projecting portion 43 are arranged at substantially the same positions as the outer ends of the cylindrical portion 41 in the vehicle width direction W. As shown in FIG. In addition, the vertex of the upper side Zu of the projecting portion 43 coincides with the vertex of the upper end side (upper side Zu) of the cylindrical portion 41 .

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.
Specifically, as shown in FIG. 2, the upper case 20 is formed in a substantially hollow box shape with an open lower side Zd. 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 portion 41, and a fastening screw B through which the protruding portion 43 is inserted is located 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 mounting holes 31 at positions corresponding to the fastening structure 40 and the fastened portion 50 when housed in the electric junction box 1. It is
The mounting 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 can be fastened and fixed with the printed circuit board 30 accommodated therein by fastening the fastening structure 40 and the fastening portion 50 with fastening screws B. The electric connection box 1 configured in this way can suppress the intrusion of water from the fastening structure 40 in a state of being mounted on a vehicle.

Hereinafter, the flow of water when the electrical connection box 1 is splashed with water while the electrical connection box 1 is mounted on a vehicle will be briefly described with reference to FIG.
As shown in FIGS. 1 and 6, in the vicinity of the dashboard in the engine room, the electric connection box 1 has a lower case bottom surface 12 facing the front side Hf, which is the rear of the vehicle, and a connector connection portion 13 arranged on the right side Wr. is mounted as That is, when the electric connection box 1 is mounted on the vehicle, the projecting portion 43 provided on the bottom surface 12 of the lower case is arranged on the upper side Zu.

For example, if water enters the engine room while driving in the rain or washing the car, the electrical connection box 1 may be splashed with water. It will flow.

As shown in FIG. 6, the water flowing along the lower case bottom surface 12 to the lower side Zd may flow upwards from the fastening structure 40 (indicated by an arrow L1 in the figure). The water thus flowing hits the projecting portion 43 and changes its direction of flow (indicated by an arrow L2 in the figure). As a result, water can be prevented from directly flowing into the cylindrical portion 41 and can be prevented from entering the cylindrical portion 41 .

Further, the water whose flow is changed to both sides in the vehicle width direction W by the projecting portion 43 flows downward Zd (indicated by an arrow L3 in the figure) and enters the upward enlarged diameter concave portion 42a. The water that has thus entered the upper enlarged diameter recess 42a is guided to the lower enlarged diameter recess 42b along the upper enlarged diameter recess 42a (indicated by an arrow L4 in the figure).

In addition, since the downward enlarged diameter recess 42b is wider in the downward direction Zd than the upward enlarged diameter recess 42a, and the groove on the radially inner side of the cylindrical portion 41 is deep, the inclination angle of the downward enlarged diameter recess 42b is large. Become. As a result, the water flowing along the downward enlarged diameter concave portion 42b can be guided to the extending groove portion 42c (indicated by an arrow L5 in the drawing).

Water flowing along the downward enlarged diameter recess 42b on both sides in the vehicle width direction W merges at the lower end portion of the downward enlarged diameter recess 42b and flows along the extending groove 42c to the downward side Zd ( indicated by an arrow L6 in the figure). This can prevent water from entering the cylindrical portion 41 .

Such a fastening structure 40 is provided on the lower case 10 in order to insert and fasten the fastening screw B that fixes the lower case 10 to the upper case 20 . The fastening structure 40 is recessed from the surface of the lower case 10 (lower case bottom surface 12) and has a bottomed cylindrical portion 41 having a cylindrical bottom portion 41c in which the fastening screw B is arranged, and the end of the rear side Hb of the cylindrical portion 41. and the surface of the lower case 10 , and the enlarged diameter recessed portion 42 gradually increases in diameter from the end of the cylindrical portion 41 on the rear side Hb toward the surface of the lower case 10 . Further, the enlarged diameter concave portion 42 is formed on the lower side Zd when the upper case 20 to which the lower case 10 is fixed is mounted on the vehicle body.

In this manner, the outer edge of the cylindrical portion 41 on the surface side is formed with the enlarged diameter recess 42 connecting the surface side end of the cylindrical portion 41 and the surface of the lower case 10 . Therefore, the water flowing on the surface of the lower case 10 can be transmitted to the expanded diameter recess 42 and guided to the lower side Zd than the cylindrical portion 41 in the mounted state. Therefore, it is possible to prevent the water flowing through the fixed portion from entering the cylindrical portion 41 when washing the car or driving in the rain, for example.

Further, the enlarged diameter concave portion 42 is provided along the entire circumference of the surface-side end portion of the cylindrical portion 41 . As a result, even if water flows from the upper side Zu of the cylindrical portion 41 in the mounted state, the water is transmitted to the enlarged diameter recessed portion 42 (from the upper enlarged diameter recessed portion 42a to the downward enlarged diameter recessed portion 42b), can also be guided to the lower side Zd. As a result, water flowing from the upper side Zu of the cylindrical portion 41 can be further suppressed from entering the cylindrical portion 41 .

Furthermore, the enlarged diameter concave portion 42 has a width that increases toward the lower side Zd in the mounted state when viewed from the front-rear direction H, which is the direction in which the fastening screw B is inserted. Accompanying this, the area of the enlarged diameter concave portion 42 is increased. Therefore, in the mounted state, the water flowing on the surface of the lower case 10 can be transmitted to the expanded diameter recess 42 and guided to the lower side Zd than the cylindrical portion 41 . For this reason, water that has traveled to the concave and convex portions can be reliably flowed to the lower side Zd of the cylindrical portion 41, and water intrusion into the cylindrical portion 41 can be reliably suppressed.

Furthermore, since the enlarged diameter recessed portion 42 becomes deeper as it goes downward in the mounted state, the volume of the groove formed by the enlarged diameter recessed portion 42 becomes larger toward the lower side Zd. Therefore, it is possible to more reliably guide the water that has spread to the diameter-enlarged concave portion 42 to the lower side Zd of the cylindrical portion 41 in the mounted state.

As a result, entry of water into the cylindrical portion 41 can be more reliably suppressed. In addition, since the volume of the groove formed by the diameter-enlarged concave portion 42 increases downward, even if a large amount of water converges, it can be guided to the lower side Zd of the cylindrical portion 41 .

Further, the expanded diameter concave portion 42 is provided with an extending groove portion 42c extending from the outer edge toward the lower side Zd in the mounted state and recessed toward the insertion direction (forward side Hf) of the fastening screw B. . Therefore, the water flowing through the diameter-enlarged concave portion 42 can be guided along the extending groove portion 42c to the lower side Zd in the mounted state. As a result, it is possible to reliably guide the water that has reached the diameter-enlarged recess 42 further downward from the lower end side of the diameter-enlarged recess 42 in the mounted state. In other words, the water that has reached the diameter-enlarged concave portion 42 can be drained downward without accumulating on the lower end side, so that the intrusion of water into the cylindrical portion 41 can be more reliably suppressed.

A projecting portion 43 projecting in the opposite direction to the insertion direction of the fastening screw B, that is, in the rearward direction Hb in the front-rear direction H, is provided on the upper Zu side of the cylindrical portion 41 in the mounted state. As a result, water flowing from the upper side Zu of the cylindrical portion 41 can hit the projecting portion 43 when the electric connection box 1 configured by the lower case 10 is mounted on the vehicle body. As a result, the direction in which water flows can be changed, and direct entry of water into the cylindrical portion 41 can be prevented.

In addition, since the protruding portion 43 is formed in an arc protruding toward the upper side Zu, it is possible to divide the flowing water into the right side Wr and the left side Wl, thereby preventing the water from concentrating in one place. can. As a result, it is possible to prevent excessive water from flowing toward the diameter-enlarged concave portion 42, so that it is possible to reliably prevent the cylindrical portion 41 from being flooded. It should be noted that the projecting portion 43 need not be formed in an arc shape, and may be formed in a mountain shape.

Further, by causing the water flowing on the surface of the lower case 10 to hit the projecting portion 43 , the direction of water flow can be changed and the water can be guided so as to be transmitted to the diameter-enlarged recess portion 42 . Therefore, it is possible to more reliably prevent water from entering the cylindrical portion 41 .

In addition, since the depth of the groove of the diameter-enlarged recess 42 gradually decreases as it goes radially inward, the inclination of the diameter-enlarged recess 42 increases on the lower side Zd. Therefore, the water that has reached the diameter-enlarged concave portion 42 flows more radially outward on the lower side Zd. Therefore, it is possible to more reliably prevent water from entering the cylindrical portion 41 .

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 insertion direction corresponds to the front-back direction H,
The enlarged diameter recess corresponds to the enlarged diameter recess 42,
The lower side corresponds to the lower side Zd,
The extending groove corresponds to the extending groove 42c,
The protrusions correspond to the protrusions 43, but the present 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 enlarged diameter recessed portion 42 is provided along the entire circumference of the cylindrical portion 41 when viewed along the front-rear direction H. At least a part of it should be arranged on the lower side Zd of 41 .

Specifically, as shown in FIG. 7A showing another embodiment of the fastening structure 40, the diameter-enlarged recesses 42 are provided along both sides of the cylindrical portion 41 in the vehicle width direction W and the lower side Zd. may be Further, as shown in FIG. 7B showing another embodiment of the fastening structure 40, the fastening structure 40 is provided only on both sides in the vehicle width direction W of the cylindrical portion 41, and the shape thereof is partially or wholly linear. good too.

Further, when the diameter-enlarged recess 42 is provided in a portion of the surface-side end portion of the cylindrical portion 41, the diameter-enlarged recess 42 may be singular or plural. Specifically, as shown in FIGS. 7(a) and 7(b), when viewed from the direction in which the fastening screw B is inserted (the front-rear direction H), they are arranged at positions facing each other with the cylindrical portion 41 interposed therebetween. good too. It should be noted that they do not need to be positioned to face each other with the cylindrical portion 41 interposed therebetween, and for example, a plurality of them may be arranged irregularly.

Further, in the present embodiment, the enlarged diameter concave portion 42 is formed in an arc shape along the outer edge of the cylindrical portion 41 when viewed from the insertion direction (front-rear direction H) of the fastening screw B in the mounted state. 8, the enlarged diameter recess 42 may be configured linearly.

Furthermore, in the present embodiment, in the cross section viewed from the direction perpendicular to the front-rear direction H, the enlarged diameter recess 42 is configured such that the end portion of the surface side of the cylindrical portion 41 and the surface of the lower case 10 face downward Zd. It consists of protruding circular arcs. However, the configuration is not limited to this configuration, and a configuration in which the connection is performed in a stepped shape having a square shape or in a recessed shape may be employed.

Furthermore, in the present embodiment, the diameter-enlarged recess 42 is formed so as to be deep on the radially inner side, but as shown in FIG. .

In addition, in the present embodiment, the length between the surface side end of the cylindrical portion 41 and the radially outer end of the enlarged diameter recess 42 increases as the downward enlarged diameter recess 42b moves toward the lower side Zd when viewed in the front-rear direction H. It is configured in an arc shape. However, the downward enlarged diameter concave portion 42b does not necessarily have to be arc-shaped, and for example, as shown in FIG. It may be the case that there is

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 portion 42 Expanded diameter concave portion 42c Extension groove portion 43 Protruding portion B Fastening screw H Front-back direction Zd Lower side

Claims (7)

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;
The rear end portion of the tubular portion in the insertion direction of the fastening jig and the surface of the fixed body are connected, and gradually from the rear end portion of the tubular portion in the insertion direction toward the surface of the fixed body. and a diameter-expansion recess that expands to
The diameter-enlarging concave portion is a structure of a fastening portion formed on the lower side in a mounted state in which the fixed body to which the fixed body is fixed is mounted on a vehicle body. The enlarged diameter concave portion is
2. The structure of the fastening portion according to claim 1, wherein the fastening portion is provided along the entire circumference of the surface-side end portion of the cylindrical portion. The enlarged diameter concave portion is
3. The fastening portion structure according to claim 1, wherein a width along a radial direction with respect to the center of the cylindrical portion when viewed from the insertion direction increases downward in the mounted state. The enlarged diameter concave portion is
4. The fastening portion structure according to any one of claims 1 to 3, wherein the depth on the same circumference with respect to the center of said cylindrical portion becomes deeper as it goes downward in said mounted state. 5. The enlarged diameter concave portion is provided with an extending groove portion extending downward in the mounted state from an outer edge and recessed in the insertion direction. The structure of the fastening part described in . 6. The fastening portion structure according to any one of claims 1 to 5, wherein a projecting portion projecting in a direction opposite to the insertion direction is provided on the upper side of the cylindrical portion in the mounted state. The enlarged diameter concave portion is
7. The fastening portion structure according to any one of claims 1 to 6, wherein the depth of the groove gradually increases as it goes radially inward.

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