JP7465022B1 - Nut and Board Construction - Google Patents

Abstract

[Problem] To provide a nut that is lightweight and can be firmly fixed to a substrate. [Solution] A nut 1 comprising at least an inner cylinder portion 10 having a female thread 11a formed on its inner peripheral surface 11, a seat portion 20 extending radially outward from one end of the inner cylinder portion 10, and an outer cylinder portion 30 that extends from the outer periphery of the seat portion 20 in an extension direction along the central axis CL of the female thread 11a and is integral with the seat portion 20, the inner cylinder portion 10 extending from the seat portion 20 in the extension direction. [Selected Figure] Figure 1

Description

The present invention relates to a nut and a base structure.

A known type of nut is one in which a metal plate is drawn to form a cylindrical portion and a flange-shaped seat portion at the upper end of the cylindrical portion, and a female thread is formed on the inner peripheral surface of the cylindrical portion. See, for example, Patent Document 1.

JP 2022-068782 A

In recent years, boards have been stacked to save space, and such boards may be installed in places where they are subject to relatively large vibrations, such as in automobiles. Nuts are required to be lightweight and to be able to be firmly fixed to the board.

The nut of the first aspect of the present invention is a nut comprising at least an inner tube portion having a female thread formed on its inner surface, a seat portion extending radially outward from one end of the inner tube portion, and an outer tube portion extending from the outer periphery of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, wherein the inner tube portion extends from the seat portion in the direction along the central axis , and a gas vent hole is formed connecting the space between the inner tube portion and the outer tube portion to the outside of the nut .
A nut of a second aspect of the present invention comprises at least an inner tube portion having a female thread formed on its inner circumferential surface, a seat portion extending radially outward from one end of the inner tube portion and functioning as a seat to which a substrate is attached by a screw member screwed into the female thread, and an outer tube portion extending from the outer periphery of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, wherein the inner tube portion extends from the seat portion in the direction along the central axis, and a first dimension in the direction along the central axis of the inner tube portion from a surface of the seat portion from which the outer tube portion and the inner tube portion extend is equal to a second dimension in the direction along the central axis of the outer tube portion from the surface, or the first dimension is greater than the second dimension.
A nut of a third aspect of the present invention is a nut comprising at least an inner tube portion having a female thread formed on its inner circumferential surface, a seat portion extending radially outward from one end of the inner tube portion, an outer tube portion extending from the outer circumferential portion of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, and a fixed portion provided at the tip of the outer tube portion and fixed to a board by solder, wherein the inner tube portion extends from the seat portion in the direction along the central axis, a cut surface facing radially outward is formed on the outer circumferential surface of the tip of the outer tube portion, and the fixed portion has the outer circumferential surface of the outer tube portion and the cut surface.
A nut of a fourth aspect of the present invention is a nut comprising at least an inner tube portion having a female thread formed on its inner circumferential surface, a seat portion extending radially outward from one end of the inner tube portion, an outer tube portion extending from the outer circumferential portion of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, and a fixed portion provided at the tip of the outer tube portion and fixed to a board by solder, wherein the inner tube portion extends from the seat portion in the direction along the central axis, a groove extending circumferentially is formed on the outer circumferential surface of the tip of the outer tube portion, and the fixed portion has the outer circumferential surface of the outer tube portion and the groove.
A nut of a fifth aspect of the present invention is a nut comprising at least an inner tube portion having a female thread formed on its inner circumferential surface, a seat portion extending radially outward from one end of the inner tube portion, an outer tube portion extending from the outer circumferential portion of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, and a fixed portion provided at the tip of the outer tube portion and fixed to a board by solder, wherein the inner tube portion extends from the seat portion in the direction along the central axis, the outer tube portion is formed so as to expand radially outward toward its tip, an angle formed between the direction in which the outer circumferential surface of the outer tube portion extends and the central axis on a cut surface passing through the central axis of the nut is 2° or more, and the fixed portion consists of the outer circumferential surface of the outer tube portion formed so as to expand radially outward.
A nut of a sixth aspect of the present invention comprises at least an inner tube portion having a female thread formed on its inner circumferential surface, a seat portion extending radially outward from one end of the inner tube portion, and an outer tube portion extending from the outer circumferential portion of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, wherein the inner tube portion extends from the seat portion in the direction along the central axis, and a solder wick prevention surface is formed on the inner circumferential surface of the inner tube portion toward the tip side of the female thread, facing the tip side of the inner tube portion in the direction along the central axis.

A seventh aspect of the present invention provides a substrate structure comprising at least a first substrate, a nut fixed to the first substrate by solder, a second substrate fixed to the first substrate via the nut, and a screw member screwed into the nut to fix the second substrate to the nut, wherein the nut comprises an inner tube portion having a female thread formed on its inner peripheral surface, a seat portion extending radially outward from one end of the inner tube portion, and an outer tube portion extending from an outer periphery of the seat portion in a direction along the central axis of the female thread and being integral with the seat portion, wherein the inner tube portion extends from the seat portion in the direction along the central axis , and the solder connects at least the inner and outer peripheral surfaces of the outer tube portion to the first substrate , and connects the outer peripheral surface of the inner tube portion to the first substrate .
A substrate structure according to an eighth aspect of the present invention includes at least a first substrate, a nut fixed to the first substrate by soldering, a second substrate fixed to the first substrate via the nut, and a screw member screwed into the nut from the second substrate side to fix the second substrate to the nut, wherein the nut includes an inner cylindrical portion having a female thread formed on an inner circumferential surface thereof, a seat portion extending radially outward from one end of the inner cylindrical portion and contacting the second substrate, and an outer cylindrical portion extending from an outer circumferential portion of the seat portion in a direction along a central axis of the female thread and being integral with the seat portion,
The inner tube portion extends from the seat portion in the direction along the central axis, and the solder connects at least the inner and outer surfaces at the tip of the outer tube portion in the direction along the central axis to the first substrate.

1A to 1C are cross-sectional views of examples 1 to 3 of the nut according to the first embodiment. 1 is a cross-sectional view of a substrate structure according to a first embodiment. FIG. 11 is a perspective view of Example 2 of the nut according to the first embodiment. FIG. 11 is a perspective view of Example 2 of the nut according to the first embodiment. 1A to 1C are cross-sectional views of examples 4 to 6 of the nut according to the first embodiment. 13A and 13B are cross-sectional views of Examples 7 and 8 of the nut according to the first embodiment and a plan view of Example 7. 11A to 11C are cross-sectional views of the nut according to the first embodiment. 13A and 13B are cross-sectional views of the nut according to the first embodiment. 13A and 13B are cross-sectional views of examples 14 and 15 of the nut according to the first embodiment. 13A and 13B are cross-sectional views of examples 16 and 17 of the nut according to the first embodiment. 18A and 18B are cross-sectional views of examples 18 and 19 of the nut according to the first embodiment. FIG. 11 is a perspective view of a nut according to a second embodiment. 11A and 11B are cross-sectional views of examples 2-1 and 2-2 of the nut according to the second embodiment. 14 is a cross-sectional view of the nut according to the second embodiment taken along line XIV-XIV in FIG. 12 for Examples 2-3 and 2-4.

A nut 1 and a base structure 2 according to a first embodiment will now be described with reference to the drawings.
The substrate structure 2 of the first embodiment includes at least a first substrate 51, a second substrate 52, one or more nuts 1, and a screw member 54 such as a bolt that screws into the nut 1 (FIG. 2).
The substrates 51 and 52 are substrates on which known electronic components such as resistors, capacitors, integrated circuits, diodes, etc. are mounted on one or both sides of their thickness direction depending on the application, function, etc.

In the first embodiment, as shown in FIG. 2, a hole 52a through which a screw member 54 is inserted is formed in the second substrate 52, and a nut 1 is fixed by solder 60 at a position on the first substrate 51 corresponding to the hole 52a.
1, the nut 1 at least comprises a cylindrical inner tube portion 10 having a female thread 11a formed on its inner peripheral surface 11, a plate-like seat portion 20 extending radially outward from one end of the inner tube portion 10, and a cylindrical outer tube portion 30 extending from the outer periphery of the seat portion 20 in an extension direction along the central axis CL of the female thread 11a and integral with the seat portion 20. The outer shapes of the cross sections of the inner tube portion 10 and the outer tube portion 30 may be polygonal or of another shape rather than circular, in which case the seat portion 20 also has an appropriate shape.

In the first embodiment shown in FIG. 1, the tip 10a of the inner tube 10 in the extension direction is an end member 12, and the tip 10a of the inner tube 10 is closed by the end member 12. The dimension L1 from the surface 20a of the seat 20 on the side where the tubes 10 and 30 protrude to the tip of the outer tube 30 is equal to the dimension L2 from the surface 20a to the tip of the inner tube 10, or the dimension L2 is slightly shorter. Note that the dimensions L1 and L2 are dimensions in the extension direction. As a result, even if the first board 51 does not have a hole corresponding to the inner tube 10, the tip 30a of the outer tube 30 is reliably fixed to the first board 51 by the solder 60.

In addition, in Example 1, the tip 10a of the inner tube 10 is also fixed to the first board 51 by solder 60, which contributes to increasing the adhesion of the nut 1 to the first board 51. In this case, the end member 12 of the tip 10a is the part fixed by the solder 60. When the surface of the end member 12 is fixed to the first board 51 by solder 60 as in Example 1, the area of the solder for fixing the nut 1 becomes larger.

1, the dimension L2 is longer than the dimension L1. In this case, an accommodation hole 51a is formed in the first substrate 51 to accommodate the tip side of the inner tube portion 10, and when the tip portion 30a of the outer tube portion 30 is fixed to the first substrate 51 by the solder 60, the tip side of the inner tube portion 10 is accommodated in the accommodation hole 51a.
The outer peripheral surface of the tip side of the inner tube portion 10 is fixed to the inner peripheral surface of the receiving hole 51a by the solder 60 as in the second embodiment, which contributes to increasing the fixing force of the nut 1 to the first board 51. Note that the tip portion 10a of the inner tube portion 10 in the second embodiment is closed by the end member 12, but the tip of the inner tube portion 10 in the second embodiment may be open without being closed by the end member 12 as in the third embodiment described below. In the second embodiment, the tip side of the inner tube portion 10 is narrowed and a step portion 10b is formed. Such a configuration is useful in cases where a large hole 51a cannot be provided in the first board 51, or when the step portion 10b is brought into contact with the first board 51 to position the nut 1 relative to the board 51.

In Example 3 of FIG. 1, the tip of the inner tube portion 10 in Example 1 is open and not closed by the end member 12. In this case, the female thread 11a can be reliably formed on the entire inner peripheral surface of the inner tube portion 10, which is useful for reducing the dimension of the nut 1 in the extension direction. It is also possible to omit the receiving hole 51a provided in the first substrate 51 in Example 3 of FIG. 1.

In the first embodiment, only a part 12a of the end member 12 may be connected to the tip side of the inner cylindrical portion 10, and the other part of the end member 12 may be separated from the base end side of the inner cylindrical portion 10 to form a non-connected part 12b. In this case, the end member 12 is disposed at the position shown by the dashed line in the first embodiment of FIG. 1 when forming the female thread 11a on the inner peripheral surface 11, and is disposed at the position shown by the solid line in the first embodiment of FIG. 1 after the female thread 11a is formed. As a result, the female thread 11a is formed over the entire inner peripheral surface 11. This is useful, for example, for reducing the size of the nut 1 in the direction along the central axis CL, and is also useful for ensuring the connection between the screw member 54 and the female thread 11a. A similar configuration can be applied to the end member 12 of the second embodiment. Of course, in the first embodiment, there is also a case where the non-connected part 12b is not provided on the inner cylindrical portion 10 as in the second embodiment.
In the first embodiment, the surface of the non-connecting portion 12b extends in a direction intersecting the central axis CL, but the surface of the non-connecting portion 12b may extend in a direction along the central axis CL. Also, a small hole may be formed in the radial center of the end member 12.

When soldering is performed using a heating furnace such as a reflow furnace, it is also possible to perform a solder wicking prevention treatment on the tip 10a of the inner tube portion 10 of Example 3 or its vicinity in order to prevent and/or reduce the intrusion of the solder 60 into the female thread 11a. As a solder wicking prevention treatment, a coating called Obi-One (registered trademark) Coat made by Tokushu Kinzoku Excel Co., Ltd., a known treatment using gold plating, etc. can be used.

In the first embodiment, the nut 1 is formed by pressing and tapping a metal plate such as a known steel plate. For example, in the cases of Examples 1, 2, and 3, a metal plate having a thickness of 0.4 to 2.0 mm is used, and preferably, a metal plate having a thickness of 0.6 to 1.5 mm is used in consideration of both strength and weight. In the cases of Examples 1 and 2, the inner cylinder portion 10 and the end member 12 are formed on a flat metal plate using a press mold having multiple processing stages, the flat portion on the radial outer side of the inner cylinder portion 10 becomes the seat portion 20, and then the outer cylinder portion 30 is formed using the material on the radial outer side of the seat portion 20. In the case of Example 3, the inner cylinder portion 10 is formed using a similar press mold, and then the outer cylinder portion 30 is formed. For this reason, in the first embodiment, the inner cylinder portion 10 is integral with the seat portion 20, the outer cylinder portion 30 is also integral with the seat portion 20, and the inner cylinder portion 10, the seat portion 20, and the outer cylinder portion 30 are formed from a single metal plate. 2 and 3 show perspective views of the second embodiment.
In the first, second and third embodiments, the inner cylinder portion 10 and the outer cylinder portion 30 may be formed simultaneously, or the outer cylinder portion 30 may be formed prior to the inner cylinder portion 10 .

In one example, the press mold has an upper mold and a lower mold, and punches or dies are provided at positions on the upper mold and lower mold that correspond to the multiple processing stages. The punches used are those required for each stage, such as drawing punches, bending punches, and punching punches.

In the first embodiment, for example, a tap for forming a female thread 11a is inserted into the inner cylindrical portion 10 formed by the above press processing, and the female thread 11a is formed according to the shape of the tap. In one example, the tap is attached to a female thread forming machine or the like, and the female thread 11a is formed in the inner cylindrical portion 10 placed at a predetermined position of the female thread forming machine. The female thread forming machine may be provided in the press processing machine.

In the first embodiment, cream solder is applied to the soldering portion of the nut 1 on the first substrate 51, the nut 1 is placed on the soldering portion, and in this state, the first substrate 51 and the nut 1 are heated in a heating furnace. As a result, as shown in Examples 1 to 3 in FIG. 1, the inner circumferential surface 31 and the outer circumferential surface 32 of the tip portion 30a of the outer tube portion 30 are connected to the first substrate 51 by solder 60, for example, by soldering. The inner circumferential surface 31 and the outer circumferential surface 32 may be connected to the first substrate 51 by solder 60 by a method other than soldering. This configuration is useful for reliably fixing the nut 1 to the first substrate 51. Note that the solder 60 tends to extend over the entire circumference of the inner circumferential surface 31 and the outer circumferential surface 32, but depending on the conditions, it may not be present over the entire circumference. Also, depending on the conditions, the solder 60 may be attached only to one of the inner circumferential surface 31 and the outer circumferential surface 32.

As shown in FIG. 2, the screw member 54 is screwed into the nut 1 in such a manner that one surface in the thickness direction of the second board 52 and/or the head of the screw member 54 contacts the seat surface 21 of the seat portion 20 of the nut 1 fixed by the solder 60, and the second board 52 is fixed to the nut 1 and the first board 51 by the screw member 54.

As shown in FIG. 5, a protrusion 33 that protrudes radially outward may be formed on the outer peripheral surface of the tip 30a of the outer tube 30. The protrusion 33 of Example 4 is a flange-shaped protrusion formed by the press working described above. In one example, the protrusion 33 of Example 4 is formed by pinch trimming. For example, during press working, a flat surface extending radially outward from the tip of the outer tube 30 is formed, and the flat surface is cut by the cutting process of the press working to form the flange-shaped protrusion 33 of Example 4. When pinch trimming is used as in Example 4, the flatness of the tip surface of the outer tube 30 is easily improved, which contributes to improving the strength, dimensional accuracy, etc. of the substrate structure 2.

The protrusion 33' in Example 5 is formed when cutting a position corresponding to the tip surface of the outer tube portion 30 in the metal plate during the above-mentioned press processing, or is formed by applying force with a mold to the tip surface of the outer tube portion 30 during the above-mentioned press processing.
The protrusion 33'' in Example 6 is formed by forming the outer tubular portion 30 so as to expand toward its tip by the above-mentioned press processing. As shown in Figure 5, in a cross section passing through the central axis CL of the nut 1, the angle α between a line along the extension direction of the entire outer tubular portion 30 of Example 6 or the outer circumferential surface 32 on the tip side thereof and the extension direction of the central axis CL is 2° or more. There may be cases where the angle α is approximately 40°. Even in this case, it can be said that the outer tubular portion 30 extends in the direction along the central axis CL from the outer circumferential portion of the seat portion 20.

The protruding height L3 of the protruding portions 33, 33', 33'' may be 0.02 mm or more, and the protruding portions 33, 33', 33'' may be provided at a plurality of positions in the circumferential direction of the outer tubular portion 30 at intervals from each other.
Examples 4 to 6 can be applied to Examples 1 to 3 as necessary.
The configurations of Examples 4 to 6 have the effect of making it difficult for the outer tube portion 30 to come off the solder 60 in the extending direction.

For example, in the fourth embodiment, a plurality of notches 34 may be formed in the protruding portion 33 as in the seventh embodiment shown in Fig. 6. The notches 34 may extend to the base end side or the middle part of the outer tube portion 30. As shown in the bottom view of the seventh embodiment shown in Fig. 6, the plurality of notches 34 are provided at intervals in the circumferential direction of the outer tube portion 30. This configuration contributes to an increase in the contact area between the solder 60 and the outer tube portion 30, and the formation of a circumferential catch between the solder 60 and the outer tube portion 30. There may also be a case where only one notch 34 is provided.
6, a hole 35 may be formed penetrating the outer tube portion 30. The hole 35 and the notch 34 extending to the base end side or the middle portion of the outer tube portion 30 as described above function to vent gas from the space S, etc.
The seventh and eighth embodiments can be applied to the first to sixth embodiments as necessary.

As shown in FIG. 7, an inner cylinder protrusion 13 protruding radially outward may be formed on the outer peripheral surface of the tip portion 10a of the inner cylinder portion 10. The inner cylinder protrusion 13 of the embodiment 9 of FIG. 7 is formed by applying a force in a direction along the central axis CL to the tip portion 10a with a mold in the press working described above. In the embodiment 9, an inclined surface 13a inclined with respect to the tip surface is formed on the outer peripheral surface side of the tip surface of the inner cylinder portion 10, and thus the inner cylinder protrusion 13 is formed on the tip portion 10a of the inner cylinder portion 10. The protruding height of the inner cylinder protrusion 13 is typically about 1/2 or less than 1/2 of the plate thickness of the material of the inner cylinder portion 10 or the seat surface portion 20. The inner cylinder protrusion 13' of the embodiment 10 of FIG. 7 is formed as a protrusion protruding radially from the bottom surface of the groove 14 by forming a groove 14 by machining or the like on a part of the tip side of the outer peripheral surface of the inner cylinder portion 10. A protrusion similar to the inner cylinder protrusions 13, 13' may be provided on the outer cylinder portion 30.

Also, as in Example 11 of Figure 7, by applying a force in a direction along the central axis CL to the tip portion 10a using a mold in the above-mentioned press processing, an inner tube protrusion 13'' protruding radially outward may be formed on the outer peripheral surface of the tip portion 10a of the inner tube portion 10.
Furthermore, as in Example 12 of Figure 8, unevenness may be formed in the area where connection is made by solder 60 on the outer peripheral surface of the inner tube portion 10, without providing inner tube protrusions 13, 13', 13'' on the outer peripheral surface of the inner tube portion 10.

The unevenness is formed, for example, by forming unevenness on the press mold by electric discharge machining or the like, and pressing the unevenness against the outer peripheral surface of the inner tube portion 10 by the press process. For example, by forming the unevenness on the outer peripheral surface of the inner tube portion 10, the measurement value of the arithmetic mean roughness (Ra) when measured by a surface roughness measuring device is substantially larger in the area where the unevenness is formed than in the area where the unevenness is not formed. There may also be cases where scratches are actively made on the outer peripheral surface of the inner tube portion 10 during the press process, and the scratches function as the unevenness. The same effect is achieved even if the unevenness of Example 12 is provided on the outer peripheral surface of the short inner tube portion 10 of Examples 1 and 3. The unevenness of Example 12 may also be provided in the area where the connection is made by the solder 60 on the outer peripheral surface 32 of the outer tube portion 30. Also, as in Example 13 of FIG. 8, an inner tube protrusion 13 may be formed at the tip 10a of the long inner tube portion 10.

Examples 9 to 13 can be applied to Examples 1 to 8 as necessary.
The configurations of Examples 9 to 13 have the effect of making it difficult for the inner cylinder portion 10 to come off the solder 60 in the extending direction.
The tip portion 10a of the inner cylinder portion 10, the tip portion 30a of the outer cylinder portion 30, etc. may be machined as necessary.

The nut 1 of the first embodiment is lighter in weight due to the radial space S between the inner cylinder portion 10 and the outer cylinder portion 30, and both the inner circumferential surface 31 and the outer circumferential surface 32 of the tip portion 30a of the outer cylinder portion 30 are used for connection to the first board 51 by the solder 60, which contributes to improving the fixing strength of the nut 1 to the board. This effect cannot be obtained with a forged nut, and the nut in the prior art document does not have a configuration equivalent to the outer cylinder portion 30, so this effect cannot be obtained. The distance between the inner cylinder portion 10 and the outer cylinder portion 30 is 1.5 mm or more, preferably 2 mm or more, and more preferably 2.5 mm or more. Depending on the conditions, the distance between the cylinder portion 10 and the outer cylinder portion 30 may be 1.5 mm or less.

In the first embodiment, the position of the outer periphery of the seating surface portion 20 may be shifted in the direction along the central axis line CL relative to the inner periphery as in Example 14 of FIG. 9. The position of the outer periphery of the seating surface portion 20 may be shifted in the opposite direction to Example 14. In FIG. 2, most of the seating surface portion 20 is in contact with the second substrate 52, but in Example 14, the inner periphery and the radial center side of the seating surface portion 20 are in contact with the second substrate 52. Depending on the shape of the seating surface portion 20, only the outer periphery or the radial center side of the seating surface portion 20 may be in contact with the second substrate 52. The seating surface portion 20 may have other shapes. In a cross section passing through the central axis line CL, the acute angle between the overall extension direction of the seating surface portion 20 and the central axis line CL may be about 45°. Even in these cases, the seating surface portion 20 is a portion having a seating surface 21, and the seating surface portion 20 extends at least radially outward from one end of the inner cylinder portion 10. The seat portion 20 extends radially outward from one end of the inner cylinder portion 10, and the outer cylinder portion 30 extends from the outer periphery of the seat portion 20 in a direction along the central axis line CL.

In each of the above examples, the overall shape of the nut 1, consisting of the inner cylinder portion 10, the seat portion 20, and the outer cylinder portion 30, is produced by pressing a metal plate, so the load required for processing is less than that of a forged nut, contributing to smaller equipment and less energy consumption, and also making it possible to reduce the time required to manufacture each nut compared to a forged nut.

In each of the above embodiments, as in embodiment 15 of FIG. 9, the inner cylindrical portion 10' may be produced separately and fixed to the seat portion 20 by fitting, welding, adhesive or the like.
In each of the above embodiments, the height of the nut 1 can be increased because the space S reduces the weight and the inner circumferential surface 31 of the outer cylinder portion 30 is connected to the first board 51 by the solder 60 to improve the fastening strength. Furthermore, the height of the nut 1 can be freely set because the nut 1 is formed using a thin metal plate.

Also, as in Example 16 of FIG. 10, the dimension L4 between the tip of the outer tube portion 30 and the tip of the inner tube portion 10 in the direction along the central axis CL may be 1 mm or more. In this case, even if the end member 12 is not provided on the inner tube portion 10, solder wicking onto the female thread 11a can be effectively prevented.

Also, as in Example 17 of FIG. 10, a radial extension 10c extending radially outward may be formed on the tip side of the inner tube 10. The extension 10c is formed integrally with the inner tube 10, and in Example 17, the tip of the inner tube 10 is the extension 10c. The surface 10d of the extension 10c on the first board 51 side is preferably inclined relative to the first board 51 as in Example 17. Therefore, during soldering using a heating furnace such as a reflow furnace, solder tends to accumulate in the space between the surface 10d and the first board 51, and even if the inner tube 10 does not have an end member 12, solder wicking to the female thread 11a can be effectively prevented.

Also, as in Example 17 of FIG. 10, a chamfered solder wicking prevention surface 10e may be provided on surface 10d. Solder wicking prevention surface 10e faces the tip of inner tube portion 10 in the direction along central axis CL, that is, faces the lower side of FIG. 10. It is preferable that the angle between solder wicking prevention surface 10e and first substrate 51 is 30° or more. This configuration makes it easier for solder to accumulate in the space between solder wicking prevention surface 10e and first substrate 51, and solder wicking to female thread 11a can be more effectively prevented.

Also, as in Example 18 of FIG. 11, a radial extension 10f extending radially outward may be formed on the tip side of the inner tube portion 10. The extension 10f is formed integrally with the inner tube portion 10, and in Example 17, the tip of the inner tube portion 10 is the extension 10f. A solder wicking prevention surface 10g is formed on the inner peripheral surface 11 of the inner tube portion 10 on the tip side of the female thread 11a, facing the tip side of the inner tube portion 10 in the direction along the central axis CL.

In Example 18, a hole 10h having a diameter larger than the small diameter portion of the female screw 11a is formed on the tip side of the inner cylindrical portion 10, and a solder wicking prevention surface 10g is formed by the formation of the hole 10h. Therefore, during soldering using a heating furnace such as a reflow furnace, the solder tends to accumulate on the first board 51 side rather than on the solder wicking prevention surface 10g, and even if the inner cylindrical portion 10 is not provided with an end member 12, solder wicking to the female screw 11a can be effectively prevented.
Surface 10d and solder wicking prevention surfaces 10e and 10g are formed by applying force with a mold to the corresponding locations of inner cylindrical portion 10, but they may also be formed by other methods such as machining. Note that bending the tip side of inner cylindrical portion 10 radially outward as in Examples 17 and 18 is useful for forming solder wicking prevention surfaces.

Also, as in Example 19 of FIG. 11, a groove 10i may be formed by machining or the like on the inner peripheral surface 11 of the inner cylinder portion 10 on the tip side of the female thread 11a, and a solder wicking prevention surface 10j may be formed by forming the groove 10i. The solder wicking prevention surfaces 10e, 10g, and 10j are positioned closer to the female thread 11a than the tip of the inner cylinder portion 10 in the direction along the central axis CL. Depending on the conditions, the solder wicking prevention surfaces 10e, 10g, and 10j may also be curved.

The extensions 10c and 10f in Examples 17 and 18 can function as inner tube protrusions, similar to Example 9, etc. At least one of the surface 10d and the solder wicking prevention surfaces 10e, 10g, and 10j can be applied as necessary to Example 3 or Example 2 in which the end member 12 is not provided, and can also be applied to Examples 4 to 15 with necessary modifications.

The nut 1 and the base plate structure according to the second embodiment will be described below with reference to the drawings.
The board structure of the second embodiment is the same as that of the first embodiment, except that the nut 1 is changed to a nut 3. That is, the nut 3 is fixed to the first board 51 by solder 60, a screw member 54 is screwed into the nut 3, and the second board 52 is fixed to the nut 3 and the first board 51 by the screw member 54. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The nut 3 is formed by stacking and joining multiple plate-shaped members 4 together. Each plate-shaped member 4 is formed by stamping a metal plate. In this embodiment, as shown in FIG. 12, the outer periphery 4a of each plate-shaped member 4 is polygonal and the inner hole 4b of each plate-shaped member 4 is circular, but the outer periphery of each plate-shaped member 4 can be circular or another shape.

As shown in Examples 2-1 and 2-2 in FIG. 13, the inner holes 4b of the multiple plate-like members 4 joined together form the inner circumferential surface of the nut 3, and a female thread 6a is formed on the inner circumferential surface by tapping, as in the first embodiment. In Example 2-1, the end plate-like member 4 does not have an inner hole 4b, and therefore one end of the female thread 6a is closed. Even in this case, the end plate-like member 4 can be attached after the female thread 6a is formed, so the female thread 6a is reliably formed over the entire inner circumferential surface. In Example 2-2, both ends of the female thread 6a are open.

An engagement portion 5 is formed on each plate-like member 4. In one example, as shown in Example 2-3 and Example 2-4 in FIG. 14, the engagement portion 5 is formed using a known half-punch process, which is sometimes called cutting and bending during press processing. In Example 2-3, the engagement piece 5a is half-punched in each plate-like member 4 by press processing. At this time, the entire circumference of the engagement piece 5a is not cut from the plate-like member 4, and a part of the engagement piece 5a is not cut from the plate-like member 4. By bending at least a part of the engagement piece 5a in the thickness direction of the plate-like member 4, the engagement piece 5a protrudes from one surface in the thickness direction of the plate-like member 4 to form an engagement protrusion 5b, and an engagement recess 5c is formed on one surface in the thickness direction of the plate-like member 4 by the amount of the engagement protrusion 5b.

In Example 2-4, the engaging piece 5d is half-punched in each plate-like member 4 by press working. As a result, the engaging piece 5d protrudes from one surface of the plate-like member 4 in the thickness direction to form an engaging protrusion 5e, and an engaging recess 5f is formed on one surface of the plate-like member 4 in the thickness direction by the amount of the engaging protrusion 5e.

The plate-like members 4 are joined together by stacking the plate-like members 4 and inserting the engagement protrusions 5b, 5e of one of the two adjacent plate-like members 4 into the engagement recesses 5c, 5f of the other. In this configuration, the engagement protrusions 5b, 5e and the engagement recesses 5c, 5f are formed during press working, and the plate-like members 4 are reliably joined. This is useful for both ensuring the functionality of the nut 3 and reducing manufacturing costs. The engagement protrusions 5b, 5e of the plate-like members 4 at the ends of the nut 3 in the stacking direction may be removed by machining, etc., and it is also possible to use plate-like members 4 without the engagement protrusions 5b, 5e as the plate-like members 4 at the ends of the nut 3 in the stacking direction.

In another example, multiple plate-like members 4 are joined together using adhesives, welding, etc. In yet another example, a cylindrical member is fitted onto the outer peripheral surfaces of multiple stacked plate-like members 4, and the multiple plate-like members 4 are joined together by an annular member.

In the first embodiment, the outer tube 30 may have one or more legs protruding from its tip, and the first board 51 may have a leg receiving hole into which the legs are inserted. The one or more legs are formed by pressing. For example, when the mounting position on the board is specified, the position of the nut 1 relative to the board is fixed by one or more legs that partially extend the outer tube. This configuration also helps prevent the position of the nut 1 from shifting around the central axis CL. It is also possible to provide similar legs on the nut 3 of the second embodiment.

In the first embodiment, the press mold having multiple processing stages may be configured so that the punch and die of each stage can be replaced with a punch and die for forming a nut 1 of a different size. The nut 1 of a different size is, for example, a nut having a different diameter of the female thread 11a.

Furthermore, by preparing nuts 1 of multiple sizes, the user has more design options when stacking and fixing the second board 52 on the first board 51. In this case, even when using a relatively large nut 1 with a nominal diameter of the female thread 11a of M5 (5 mm) or more, M6 (6 mm) or more, or a nut 1 with a large height, the nut 1 is made lighter by the space S, so the user can easily solve problems such as vibration input to the board, and can also achieve reliable fixing by the solder 60 described above.
In the second embodiment, by preparing nuts 3 of a plurality of sizes, the user's design options for overlapping and fixing the second substrate 52 to the first substrate 51 are similarly expanded.
The present invention is described below.
[Appendix 1]
An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extending from an outer periphery of the seat portion in an extension direction along the central axis of the female screw and integral with the seat portion,
The inner cylindrical portion extends from the seat portion in the extension direction.
[Appendix 2]
2. The nut according to claim 1, wherein a tip end of the inner cylindrical portion in the extending direction is closed by an end member.
[Appendix 3]
The nut according to claim 1, wherein a protrusion protruding radially outward is formed on an outer peripheral surface of a tip end of the outer tubular portion in the extending direction.
[Appendix 4]
The nut according to claim 1 or 2, wherein an inner cylinder protrusion protruding radially outward is formed on the outer circumferential surface of the tip end of the inner cylinder in the extending direction.
[Appendix 5]
The nut described in appendix 1 or 2, wherein a solder wicking prevention surface facing the tip side of the inner cylindrical portion in the direction along the central axis is formed on the inner surface of the inner cylindrical portion on the tip side of the female thread.
[Appendix 6]
A first substrate;
a nut fixed to the first substrate by soldering;
a second substrate fixed to the first substrate via the nut;
a screw member that is screwed into the nut to fix the second substrate to the nut,
The nut is
An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extending from an outer periphery of the seat portion in an extension direction along the central axis of the female screw and integral with the seat portion,
The inner cylinder portion extends in the extension direction from the seat portion,
A substrate structure, wherein the solder connects at least the inner and outer circumferential surfaces of the outer cylinder portion to the first substrate.

1, 3 Nut 2 Board structure 10 Inner cylinder portion 10e, 10g, 10j Solder wicking prevention surface 11a Female screw 12 End member 20 Seat portion 30 Outer cylinder portion 33 Protrusion 51 First board 52 Second board 54 Screw member 60 Solder CL Central axis

Claims (13)

A first substrate;
a nut fixed to the first substrate by soldering;
a second substrate fixed to the first substrate via the nut;
a screw member that is screwed into the nut to fix the second substrate to the nut,
The nut is
An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extends from an outer periphery of the seat portion in a direction along the central axis of the female screw and is integral with the seat portion,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
A substrate structure, wherein the solder connects at least the inner and outer surfaces of the outer tube portion to the first substrate and also connects the outer surface of the inner tube portion to the first substrate. A first substrate;
a nut fixed to the first substrate by soldering;
a second substrate fixed to the first substrate via the nut;
a screw member that is screwed into the nut from the second substrate side to fix the second substrate to the nut,
The nut is
An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion and contacting the second substrate;
An outer cylinder portion extending from an outer periphery of the seat portion in a direction along the central axis of the female screw and integral with the seat portion,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
A substrate structure, wherein the solder connects at least the inner and outer circumferential surfaces at the tip of the outer tube portion in the direction along the central axis to the first substrate. The substrate structure according to claim 2 , wherein the tip of the outer tubular portion has a cut surface facing radially outward of the outer tubular portion or a cut surface facing the direction along the central axis.
An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
A nut including at least an outer tubular portion extending from an outer periphery of the seat portion in a direction along a central axis of the female screw and integral with the seat portion,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
A nut having a gas vent hole formed therein that connects the space between the inner tubular portion and the outer tubular portion with the outside of the nut. An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion that extends radially outward from one end of the inner cylindrical portion and functions as a seat portion to which a substrate is attached by a screw member that screws into the female screw;
An outer cylinder portion extending from an outer periphery of the seat portion in a direction along a central axis of the female screw and being integral with the seat portion;
At least
the inner cylinder portion extends from the seat portion in the direction along the central axis,
a first dimension in the direction along the central axis of the inner cylinder portion from a surface of the seat portion on which the outer cylinder portion and the inner cylinder portion extend is equal to a second dimension in the direction along the central axis of the outer cylinder portion from the surface, or the first dimension is greater than the second dimension;
A nut, wherein the outer peripheral surface of the tip of the inner tube portion, the inner peripheral surface of the tip of the outer tube portion, and the outer peripheral surface of the tip of the outer tube portion are fixed portions that are fixed to a substrate different from the substrate by solder . An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extending from an outer periphery of the seat portion in a direction along a central axis of the female screw and being integral with the seat portion;
A nut including at least a fixed portion provided at a tip end of the outer cylinder portion and fixed to a board by soldering,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
a cut surface facing radially outward is formed on an outer peripheral surface of the tip end of the outer tubular portion,
The fixed portion has the outer circumferential surface and the cut surface of the outer tubular portion. An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extending from an outer periphery of the seat portion in a direction along a central axis of the female screw and being integral with the seat portion;
A nut including at least a fixed portion provided at a tip end of the outer cylinder portion and fixed to a board by soldering,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
A groove extending in a circumferential direction is formed on an outer peripheral surface of the tip end of the outer tubular portion,
The fixed portion has the outer circumferential surface of the outer tubular portion and the groove. An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extending from an outer periphery of the seat portion in a direction along a central axis of the female screw and being integral with the seat portion;
A nut including at least a fixed portion provided at a tip end of the outer cylinder portion and fixed to a board by soldering,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
the outer tubular portion is formed so as to expand radially outward toward its tip, and an angle between a direction in which an outer circumferential surface of the outer tubular portion extends and the central axis in a cross section passing through the central axis of the nut is 2° or more,
The fixed portion is formed from the outer peripheral surface of the outer tubular portion which is formed so as to expand radially outward. The nut according to any one of claims 4 to 8 , wherein a tip of the inner cylindrical portion is closed by an end member. The nut according to claim 9, wherein a portion of the end member is connected to the tip side of the inner cylindrical portion, and a non-connected portion in which the end member is separated from the inner cylindrical portion is formed in a portion other than the portion at the tip of the inner cylindrical portion. The nut according to claim 4 or 5, wherein a protrusion that protrudes radially outward is formed on the outer peripheral surface of the tip of the outer tubular portion in the direction along the central axis. The nut according to claim 5, wherein an inner cylinder protrusion that protrudes radially outward is formed on the outer peripheral surface of the tip of the inner cylinder in the direction along the central axis. An inner cylindrical portion having a female screw formed on an inner circumferential surface thereof;
a seat portion extending radially outward from one end of the inner cylindrical portion;
An outer cylinder portion extending from an outer periphery of the seat portion in a direction along the central axis of the female screw and integral with the seat portion,
the inner cylinder portion extends from the seat portion in the direction along the central axis,
A nut having a solder wicking prevention surface formed on the inner circumferential surface of the inner cylindrical portion on the tip side of the female thread, the solder wicking prevention surface facing the tip side of the inner cylindrical portion in the direction along the central axis.

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