WO2008050515A1

WO2008050515A1 - Metal fixture with threads

Info

Publication number: WO2008050515A1
Application number: PCT/JP2007/064591
Authority: WO
Inventors: Yoshifumi Oniyama; Koichi Shinada
Original assignee: Advanex Inc.
Priority date: 2006-10-25
Filing date: 2007-07-25
Publication date: 2008-05-02
Also published as: JP2008106838A

Abstract

A metal fixture with threads, which is buried in a resin member and cylindrically formed, and which includes threads of a female screw on the inner peripheral surface of its mounting hole. The cross section of the mounting hole is formed in a generally polygonal shape, and the contour of the cross section of the fixing device is formed in a generally polygonal shape. By such a constitution, the heat dissipating performance of the fixing device can be increased.

Description

Specification

Threaded mounting bracket

Technical field

TECHNICAL FIELD [0001] The present invention relates to a threaded fixing bracket used by being embedded in a resin member.

This application (October 2006, No. 25, No. 25, No. 2006, No. 289758, Japanese Patent Application No. 2006-289758, filed with priority, and the contents of which are incorporated herein by reference.

Background art

[0002] When a female screw is formed on a resin member and the member is fastened using a screw or a bolt that is a male screw, the female screw becomes fragile compared to a case where a female screw is formed on a metal member. Therefore, in applications where a stronger fastening is required, a threaded fixture having a female thread may be embedded on the resin member side (see, for example, Patent Document 1). More specifically, the threaded fixing bracket embedded in the resin member includes a screw thread constituting an internal thread on the inner peripheral surface thereof, and on the outer peripheral surface thereof, the idle rotation and assembly in the circumferential direction with respect to the resin member. It is formed in a substantially cylindrical shape having an uneven portion for preventing the attachment in the attaching direction. Patent Document 1: Utility Model Registration No. 3075051

Disclosure of the invention

Problems to be solved by the invention

[0003] Meanwhile, in recent years, in vehicles and electronic devices, resin members are sometimes used around the engine and the circuit board to improve the appearance and reduce the weight. Since such parts around the engine and circuit boards contain relatively high temperature components, when using resin parts near these high temperature components, use a resin that is relatively resistant to high temperatures. I use it. However, although resin that is resistant to high temperatures is used, compared to metal parts, if the resin member is overheated through screws or bolts that are easily affected by high temperatures, The bonding force between the threaded fixing bracket and the resin member may be reduced.

In particular, in the case where an electronic component is mounted such as a circuit board, the characteristic may deteriorate when the temperature of the electronic component becomes high. It would be desirable to provide metal fittings that can be used!

[0004] Therefore, it is an object of the present invention to provide a threaded fixture that can improve heat dissipation performance.

Means for solving the problem

[0005] The present invention is embedded in a resin member (for example, the resin member 2 in the embodiment), is formed in a cylindrical shape, and a female is formed on the inner peripheral surface of the inner hole (for example, the mounting hole 3 in the embodiment). With respect to a threaded fixture having a thread of a screw (for example, threads 4 and 34 in the embodiment), the cross section of the inner hole is formed in a substantially polygonal shape, and the threaded fixture The outer shape of the cross section is formed in a substantially polygonal shape.

[0006] In the threaded fixing metal fitting according to the present invention, a groove portion (for example, the round groove 9 in the embodiment) along the assembly direction of the male screw is provided at the corner portion of the substantially polygonal cross section of the internal hole. It is desirable.

[0007] In the threaded fixture according to the present invention, a concave portion (for example, on the outer peripheral surface formed in a cylindrical shape)

It is desirable that the concave portion 8) or the convex portion in the embodiment is provided.

[0008] In the threaded fixture according to the present invention, at least the metal plate (for example, the materials 20, 30 in the embodiment) in which the thread is formed by pressing is cylindrical by bending. Desired to be molded into.

[0009] In the threaded fixture according to the present invention, the thread is an inner circumferential plane of the inner hole in a direction along a ridge line of the thread (for example, the first plane 10 to the seventh plane in the embodiment). 1

6) Formed separately at each time!

[0010] In the threaded fixing metal fitting according to the present invention, the thread may be arranged so that the thread is not disposed at a position adjacent to the direction along the ridge line of the thread and the direction along the pitch of the thread. ! /, Placed in the wrong position! /!

[0011] The threaded fixing bracket of the present invention is provided with! /, Thread! /, Na! /, Non-threaded parts (for example, the enlarged diameter part 19 in the embodiment). It is desirable that

The invention's effect

According to the present invention, when a male screw is screwed into an internal hole having a substantially polygonal cross section, the corner of the internal hole has a substantially polygonal cross section in the mounting direction of the male screw. Along with the outside air A communicating air passage can be formed. Furthermore, since the male screw contacts only at each side having a substantially polygonal cross section of the inner hole, the contact area between the male screw and the female screw can be reduced. Therefore, the heat of the male screw can be prevented from being conducted to the female screw side, and the heat dissipation performance at the joint portion between the male screw and the female screw can be improved via the air passage. When fixed to the circuit board, it is possible to prevent the characteristics of the electronic component from deteriorating due to overheating.

[0013] In addition, when the threaded fixing bracket is embedded in a resin member, the outer shape of the threaded fixing bracket is a substantially polygonal shape, so that the threaded fixing bracket is prevented from rotating in the circumferential direction. Can do.

[0014] Further, by providing the groove portion, the cross-sectional area of the air passage formed between the internal hole and the male screw can be enlarged in a state where the male screw is screwed into the internal hole. Also, when the threaded fixture is formed into a cylindrical shape by bending, it can absorb wrinkles and tears that occur when the metal is bent by the groove. Therefore, for example, the bending process can be easily performed, and the heat dissipation performance can be further improved.

[0015] In addition, since the concave portion or the convex portion formed on the outer peripheral surface of the threaded fixing bracket is locked to the surrounding resin, it is possible to more reliably prevent the threaded fixing bracket from rotating in the circumferential direction. Use force S to prevent the threaded fixture from coming off from the resin member in the direction along the mounting direction of the male screw.

[0016] Further, since the screw thread is formed by press working, the strength can be improved as compared with the case where the thread has the same shape than that formed by cutting. In addition, when maintaining the strength, it is possible to reduce the weight by reducing the thickness of the material formed by press working than that formed by cutting. In addition, since the pressed metal plate is bent, it is excellent in assemblability.

[0017] Further, for example, a gap is formed between the screw thread formed on the inner peripheral plane of the inner hole and the screw thread formed on the inner peripheral plane adjacent to the inner peripheral plane. Since adjacent threads do not interfere with each other during processing, wrinkles and tears can be prevented.

[0018] Further, since the interval between the screw threads becomes wide, air passes through the space between the screw threads. It can be used as a passage and can further improve heat dissipation.

[0019] Also, for example, when a male screw such as a screw or bolt is screwed into the female screw of the inner hole, the tip of the male screw is guided at a correct angle by the non-threaded portion, so that the male screw smoothly Tightening work can be performed.

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view of a threaded fixture according to an embodiment of the present invention.

FIG. 2 is a perspective view of a threaded fixture according to an embodiment of the present invention.

FIG. 3 is an arrow view seen from the direction A in FIG. 2 of the embodiment of the present invention.

4 is a sectional view taken along line BB in FIG. 2 of the embodiment of the present invention.

FIG. 5 is a perspective view of a material according to an embodiment of the present invention.

FIG. 6 is a front view of the material according to the embodiment of the present invention.

FIG. 7 is a rear view of the material according to the embodiment of the present invention.

FIG. 8 is a front view of a material in a modification of the embodiment of the present invention.

Explanation of symbols

[0021] 1 Fixing bracket with thread 2 Resin member 3 Mounting hole (inner hole) 4, 34 Thread 9 Round groove (groove) 8 Recess 20, 30 Material 10 ~; 16 1st-7th plane 19 Expanded part (Non-threaded part)

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a threaded fixing bracket according to an embodiment of the present invention. The threaded fixing bracket 1 is formed in a substantially cylindrical shape, such as a metal obtained by subjecting a cold-rolled steel plate to nickel plating, and is inserted into a predetermined position of a resin member 2 used as an exterior cover for a circuit board. It is buried by molding. Here, the insert molding is a method in which resin is poured and molded in a state in which the screw fixing bracket 1 is placed in a mold such as an injection mold.

[0023] The height of the threaded fixing bracket 1 is set to be equal to the thickness of the resin member 2 in which the threaded fixing bracket 1 is embedded, and the thread formed in a cylindrical shape. The mounting hole (inner hole) 3 formed along the axial direction of the fixed bracket 1 has a female screw on its inner peripheral surface. Thread 4 is formed.

[0024] By embedding such a threaded fixture 1 in the resin member 2, the resin member 2 described above can be fastened and fixed to the metal member 5 of the circuit board on which the electronic component is mounted. .

Specifically, the metal member 5 is provided with a through hole 6, and a bolt 7 is passed through the through hole 6 to attach the bolt to the mounting hole 3 of the threaded fixing bracket 1 embedded in the resin member 2. The resin member 2 is fixed to the metal member 5 by screwing 7 together.

[0025] Next, the shape of the threaded fixture 1 will be described more specifically.

As shown in FIGS. 2 and 3, the threaded fixing bracket 1 formed in a cylindrical shape has a lateral section, that is, an outer shape of a section orthogonal to the central axis, formed in a substantially heptagonal shape. Here, the approximate heptagon is that the apex part connecting the sides of the heptagon is slightly rounded without forming an exact corner! /, And in addition to the threaded fixing bracket 1 The expression “force, et al., Abbreviation” is used because a recess 8 described later is formed on the outer periphery! Note that the cross-sectional shape of the threaded fixing bracket 1 is not limited to a substantially heptagonal shape, and may be a substantially polygonal shape such as a substantially triangular shape or a substantially octagonal shape. The smaller the number of corners, the sharper the angle formed between the sides, so that it becomes difficult for the resin member 2 to rotate freely in the circumferential direction of the threaded fixture 1.

[0026] Furthermore, the mounting hole 3 of the threaded fixing bracket 1 is formed in a substantially heptagonal cross section in the same manner as the outer shape of the threaded fixing bracket 1 described above. Then, the thread 4 described above is formed on the inner peripheral surface of the mounting hole 3, and each of the corners of the mounting hole 3 formed in a substantially heptagonal shape as shown in FIGS. A round groove 9 is formed at the apex portion along the axial direction of the mounting hole 3, which is the mounting direction of the bolt 7. In this way, each inner plane of the mounting hole 3 corresponding to each side of a substantially heptagonal cross section (corresponding to first to seventh planes 10 to 16 described later) is divided by the round groove 9. The screw threads 4 formed on the respective planes are spaced apart by the width of the round groove 9.

On the other hand, as shown in FIG. 4, no thread 4 is formed in a predetermined range along the axial direction from the upper opening 17 and the lower opening 18 of the mounting hole 3 described above, and the bolt 7 An enlarged-diameter portion (non-threaded portion) 19 formed slightly larger than the outer diameter of the male screw is provided. With this enlarged diameter part 19, the tip of the male thread of bolt 7 is inserted into this enlarged diameter part 19 when tightening the bolt. Thus, the male screw is guided toward the female screw of the mounting hole 3 at a correct angle along the axial direction of the mounting hole 3. It should be noted that the force S described in the case where the mounting hole 3 is provided with the enlarged diameter portion 19 in the vicinity of both the upper opening portion 17 and the lower opening portion 18, the upper opening portion into which the male screw of the bolt 7 is inserted. The enlarged diameter portion 19 may be provided only in the vicinity of one of the openings 17 or the lower opening 18. Further, as in the present embodiment, when the enlarged diameter portion 19 is provided in both the upper opening portion 17 and the lower opening portion 18, compared to the case where the enlarged diameter portion 19 is provided in either one, the insert There is no need to worry about the vertical direction of the threaded fixing bracket 1 during molding, which is advantageous in that the confirmation process during assembly can be omitted.

By the way, the above-described threaded fixing bracket 1 is formed into a cylindrical shape with a substantially heptagonal cross section by bending the material 20 shown in FIGS. The material 20 before the bending process is formed in a substantially rectangular flat plate shape, and the longitudinal grooves 21a to 21f, the half grooves 25L and 25R for forming the round groove 9 are formed on the surface thereof, and the screws described above. The protrusions 22 constituting the mountain 4 and the above-mentioned enlarged diameter portion 19 are formed, and a plurality of concave portions 8 are formed on the back surface thereof (see FIG. 7). Here, the material 20 is obtained by, for example, punching a metal flat plate to obtain a substantially rectangular flat plate, and the vertical grooves 21a to 21f, the half grooves 25L and 25R, the protrusions 22 and the enlarged diameter portion are formed on the surface of the flat plate. 19 is formed by press molding, and a recess 8 is formed on the back surface by press molding. 5-7, the direction along the short side of the material 20 is the up-down direction, the direction along the long side is the left-right direction, and the side on which the threaded portion is formed is the surface and the side on which the concave portion is formed. The back side will be described below.

[0029] On the surface of the material 20, six vertical grooves 21a to 21f are arranged at substantially equal intervals along the left-right direction of the material 20. The vertical grooves 21a to 21f are formed in the left and right directions from the left and right sides of the long bottom surface 23a to 23f along the vertical direction of the material 20 that forms a plane parallel to the back surface of the material 20 Are formed by curved surfaces 24a to 24f that gradually rise so as to be concave. By forming the longitudinal grooves 21a to 21f in this way, when the material 20 is bent along the longitudinal grooves 21a to 21f, the bottom surfaces 23a to 23f are curved and deformed along the bending direction to form curved surfaces. The bottom surfaces 23a to 23f of the longitudinal grooves 21a to 21f and the curved surfaces 24a to 24f become continuous curved surfaces, and after bending, the round grooves 9 described above are formed by the bottom surfaces 23a to 23f and the curved surfaces 24a to 24f. Become. On the other hand, as shown in FIG. 6, half grooves 25L and 25R are formed on the left and right side edges of the surface of the material 20 along the short side of the material 20, respectively. The half grooves 25L and 25R are formed in a shape that is substantially half of the round groove 9, that is, a curved surface that gradually rises so as to be concave toward the left and right center of the material 20. The material 20 is formed into a cylindrical shape by bending Karoe. The left edge L and the right edge R of the material 20 are opposed to each other, and two half grooves formed on the left and right side edges L of the material 20 are formed. By 25L and 25R, the same shape as one round groove 9 is exhibited. Here, since the half grooves 25L and 25R are not directly bent, the entire force groove is first formed into a curved surface by press molding. In this embodiment, a force using a round groove whose processing accuracy is not relatively high from the viewpoint of ease of processing, for example, a square groove may be used.

[0031] Further, the screw thread 4 is formed so as to protrude in a predetermined region on the surface of the material 20 excluding the region where the above-described enlarged diameter portion 19 is formed. The thread 4 has a shape such that, for example, a general thread set to a predetermined pitch and a predetermined lead angle is cut off by the above-described groove, and the thread 4 is formed into the longitudinal grooves 21a to 21f. The first plane 10 to the seventh plane 16 separated by each are individually provided. More specifically, on the first plane 10 between the rightmost half groove 25R of the material 20 and the adjacent vertical groove 21a, a protrusion 22 along a predetermined lead angle constituting the thread 4 is provided. 7 are formed at equal pitches in the vertical direction, and the slopes of the ridges 22 are inclined toward the center of the left and right sides of the ridges 22 so that the left and right side force cross sections are substantially trapezoidal.

Then, on the second plane 11 arranged next to the first plane 10, seven ridges 22 having the same shape as the ridge 22 described above are formed with the ridges 22 on the first plane 10. Arranged at equal pitches so that the ridge directions match. In the same manner as the second plane 11 described above, the protrusions 22 are sequentially arranged from the third to the seventh planes 12 to 16 so that the ridge line directions coincide with each other at an equal pitch. Here, in the sixth and seventh planes 15 and 16, when the same number of protrusions 22 as the other planes 12 to 14 are provided, it is applied to a predetermined region where the enlarged diameter portion 19 below the material 20 is formed. Therefore, the ridges 22 are omitted, and the ridges 22 are six, one less than other planes. 4 shows the case where the number of protrusions 22 is reduced by one on the sixth and seventh planes 15 and 16 from the other planes 12 to 14; Article 22 has enough space 2 One ridge 22 may be moved and formed on the upper side of the 0 surface.

On the other hand, as shown in FIG. 7, a concave portion 8 having a substantially rectangular shape in front view is formed on the back surface of the material 20 at a position corresponding to the first plane 10 to the seventh plane 16 of the material 20 by pressing. The recesses 8 constitute the locking means for the resin member 2 described above, and two recesses 8 are arranged in tandem along the longitudinal direction of the first plane 10 to the seventh plane 16. In this embodiment, the case where the concave portion 8 having a substantially rectangular shape when viewed from the front is provided on the back surface of the material 20 has been described. However, any material that serves as a locking means for the resin member 2 can be used. A concave portion having a substantially circular shape or a substantially polygonal shape or a convex portion protruding from the back surface of the material 20 may be used. Also, in the region of the back surface of the material 20 corresponding to the first plane 10 to the seventh plane 16, the force described for the case where two recesses 8 are provided, the number of which may be set appropriately, for example, only one is formed. You may make it do. Further, the shape of the concave portion and the convex portion and the number of the concave and convex portions arranged in a column may be appropriately combined. For example, each position corresponding to the first plane 10 to the seventh plane 16 It may be provided irregularly. Further, in the case where one recess is arranged without being arranged in tandem, it is not limited to the vertical center position, and may be arranged in one of the vertical directions such as the upper side of the material 20, for example.

[0034] Then, the material 20 configured as described above should be formed into a cylindrical shape, and a predetermined length along the longitudinal grooves 21a to 2 If is defined with the back surface of the material 20 formed with the recess 8 described above as the outside. Bend calorie at an angle and the left and right edges L, R of material 20 face each other. As a result, as shown in Fig. 2, the outer shape of the cross-section is bent to form a slightly curved corner on the outer peripheral side, a substantially heptagon with a concave portion 8 on the outer peripheral surface, and a rounded corner at the apex portion. A cylindrical screw having a groove 9 formed therein and a thread 4 comprising a plurality of protrusions 22 projecting toward the inner surface on the inner peripheral surface, and a mounting hole 3 having a substantially heptagonal cross section. A fixing fixture 1 with a mountain is formed. Here, when the left and right side edges L and R are opposed to each other, it is preferable that the resin does not enter the mounting hole 3 of the threaded fixing bracket 1 at the time of insert molding.

Note that the diameter of the female screw formed by the inner thread 4 of the mounting hole 3 may be slightly smaller than the diameter of the male screw of the bolt 7. When configured in this way, screw in the bolt 7 Then, the threaded fixing bracket 1 spreads in the direction in which the left and right side edges L and R are separated from each other and presses the surrounding resin member 2. Therefore, the coupling between the resin member 2 and the threaded fixing bracket 1 is strong. It becomes something. Further, since the restoring force acts on the threaded fixing bracket 1 in the direction in which the left and right side edges L and R are in close contact with each other, the bolt 7 is pressed from the surroundings to prevent the bolt 7 from loosening.

[0036] According to the embodiment described above, the mounting hole 3 has a substantially heptagonal cross section, so that when the bolt 7 having a substantially circular cross section is screwed into the mounting hole 3, the mounting hole 3 Since a gap where the bolt 7 and the inner surface of the mounting hole 3 do not contact each other is formed near the apex of the substantially hexagonal cross section, an air passage can be formed along the assembly direction of the bolt 7. Furthermore, since the bolt 7 and the threaded fixing bracket 1 are in contact with each other only at each side having a substantially hexagonal cross section, the contact area between the bolt 7 and the threaded fixing bracket 1 can be reduced. . As a result, it is possible to suppress the heat transmitted through the bolt 7 from being transmitted to the threaded fastener 1 and to cool near the contact portion between the bolt 7 and the threaded fastener 1. Since air can be sent in, the heat dissipation performance of these bolts 7 and threaded fixture 1 can be improved.

Yes

[0037] Since the heat transferred from the electronic component mounted on the circuit board to the metal member 5 is dissipated by the screw fixing bracket 1, the resin having a lower thermal conductivity than the metal. Even when the member 2 is used, the temperature rise of the electronic component can be suppressed, and as a result, the characteristic deterioration of the electronic component can be prevented.

[0038] In addition, since the external shape of the threaded fixing bracket 1 has a substantially heptagonal cross section, the threaded fixing bracket 1 is embedded in the resin member 2 in the state where the threaded fixing bracket 1 is embedded. It is possible to prevent rotation in the circumferential direction.

Furthermore, since the circular groove 9 is provided at the apex of the substantially heptagonal cross section of the mounting hole 3, the cross-sectional area of the air passage formed between the mounting hole 3 and the bonus 7 can be enlarged. The heat release performance can be further improved. Also, when forming the material 20 into a cylindrical shape by bending, wrinkles and tears caused by bending can be absorbed by the vertical grooves 21a to 21f that form the round groove 9, making bending easy become.

[0039] By forming the recess 8 on the outer periphery of the threaded fixture 1, the resin flows into the recess 8 at the time of insert molding, and the resin is solidified in this state. The screw fixing bracket 1 is locked to the resin member 2 to prevent the screw fixing bracket 1 from rotating together with the bolt 7 when the bolt 7 is tightened, and the axial direction of the bolt 7 from the resin member 2 It is possible to prevent the threaded fastener 1 from coming off.

[0040] Further, since the thread 4 is formed on the material 20 by press working, the strength of the thread 4 can be improved as compared with that formed by cutting if the shape is the same. Here, when the strength of the thread 4 is maintained, the pressed product can be made thinner and lighter than the product processed by cutting. In addition, since the pressed material 20 is bent, there is no cutting process and it is easy to assemble.

[0041] Furthermore, the thread 4 formed on any one of the first to seventh planes 10 to 16 on the inner periphery of the mounting hole 3, and the screw formed on a plane adjacent to the plane. Since a gap is formed between the threads 4 and the adjacent threads 4 do not interfere with each other during bending, wrinkles and tears can be prevented.

Next, a modification of the above-described embodiment will be described based on FIG. This modification is different from the above-described embodiment only in the configuration of the thread 4 of the female screw, and the other configuration is the same as that of the above-described embodiment.

FIG. 8 shows a material 30 in this modified example. On the surface of the material 30, six vertical grooves 21 a to 21 f along the vertical direction are formed on the surface of the material 30 by press molding as in the above-described embodiment, and the material. Two half grooves 25L and 25R along the short side are formed in the left and right side edges L and R of 30 respectively. Further, a recess 8 is formed on the back surface of the material 30 by press molding. Note that the configuration of the recess 8 is the same as that of the above-described embodiment, and thus the description thereof is omitted.

[0043] The material 30 includes first to seventh planes 10 to 16 separated by the vertical grooves 21a to 21f in order from the right side of the surface. On the first plane to the seventh plane 10 to 16, the ridge 22 constituting the screw thread 34 is formed by press molding. Here, in FIG. 8, P indicates the pitch of the thread 34 in this modified example, and seven lead wires along the ridge line of the thread 34 forming a predetermined lead angle at this pitch P (in FIG. 8). , 40a to 40g are set, and seven parallel center lines along the vertical direction of the first plane to the seventh plane 10 to 16 (Fig. 8) are set. Medium, one along the vertical direction toward the page Shown with a dotted line. ) 41a to 41g are set, and the intersecting lead wire and center line form a grid!

[0044] The lead springs 40a to 40g and the central springs 41a to 41g are arranged so that the ridges 22 are not arranged adjacent to each other in the direction along the lead wire of the thread 34 and the vertical direction of the material that is the pitch direction. It is placed on the intersection of the squares composed of!

More specifically, on the first plane 10 of the surface of the material 30, the third lead wire 40c, the fifth lead wire 40e, which are odd-numbered lead wires in order from the top of the first lead wire 40a located at the top. The ridges 22 are arranged on the seventh lead wire 40g, respectively, while on the second lead, wire 40b, fourth lead, wire 40d, sixth lead, wire 40e, which are even-numbered lead wires ( Furthermore, on the second plane 11 arranged next to the first plane 10, the second lead wire 40b, the fourth lead wire, which are even-numbered lead wires, are formed. The ridges 22 are formed on the lead wire 40d and the sixth lead wire 40f, respectively, and the ridges are formed on the odd-numbered first lead wire 40a, third lead wire 40c, fifth lead wire 40e, and seventh lead wire 40g. Similarly, in the third plane 12, the fifth plane 14, and the seventh plane 16, a protrusion 22 is formed on the same lead wire as the first plane 10, and the fourth plane 13 and 6th plane 15 are formed with ridges 22 on the same lead wire as 2nd plane 11.

That is, in the material 30 shown in FIG. 8, the ridge 22 is formed on the odd-numbered lead wire on the odd-numbered plane, and the ridge 22 is formed on the even-numbered lead wire on the even-numbered plane. Therefore, the protrusions 22 are not continuously arranged on adjacent lead wires in the same plane and on adjacent planes in the same lead wire. In the material 30 of the above-described modification example, the force provided on the odd-numbered lead wires on the odd-numbered planes and the even-numbered lead wires on the even-numbered planes is not limited to this. The arrangement of the ridges 22 should be staggered. Also, the number of lead wires is not limited to seven.

In this modified example, as in the above-described embodiment, the press-molded material 30 is aligned along the longitudinal grooves 21a to 21f so that the left edge L and the right edge R of the material 30 face each other. Thus, the cylindrical threaded metal fitting 1 having a substantially heptagonal cross section in both the outer shape and the mounting hole 3 is formed.

Further, even if the ridges 22 are formed alternately as described above, the thread ridge line of the bolt 7 is continuously formed, and further, the ridge line of the ridge 22 is formed along the lead wire. Therefore, the side surface of the ridge 22 supports the screw thread side of the bolt 7 alternately from both sides. As a result, the bolt 7 can be screwed into the mounting hole 3 and fixed in the same manner as a normal screw thread. .

[0047] Therefore, according to this modification, particularly, the gap between the protrusions 22 constituting the thread 34 is set wide, so that the cooling air passes through the space formed between the protrusions 22. It can be used as a part of the passageway, and as a result, the heat dissipation can be further improved.

[0048] In the above-described embodiment and its modifications, for example, a screw may be used instead of the force bolt 7 described in the case where the bolt 7 is screwed into the threaded fixing bracket 1. In the above-described embodiment and its modifications, the force described for the case where the threaded fixing bracket 1 is embedded in the resin member 2 covering the circuit board is not limited to the one covering the circuit board, but the fastening portion between the resin member and another member May be provided.

[0049] While the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the scope of the appended claims.

Industrial applicability

[0050] According to the present invention, it is possible to provide a threaded fixing bracket capable of improving the heat dissipation performance. Therefore, for example, when the resin member in which the threaded fixing bracket is embedded is fixed to the circuit board, it is possible to prevent the deterioration of the characteristics of the electronic component due to overheating.

Claims

The scope of the claims

[1] In a threaded fixing bracket that is embedded in a resin member and is formed in a cylindrical shape and has a thread of an internal thread on the inner peripheral surface of its internal hole,

A threaded fixing bracket in which a cross section of the inner hole is formed in a substantially polygonal shape, and an outer shape of a cross section of the threaded fixing bracket is formed in a substantially polygonal shape.

[2] The threaded fixing bracket according to claim 1, further comprising: a groove portion extending along the mounting direction of the male screw at a corner portion having a substantially polygonal cross section of the internal hole!

[3] The threaded fastener according to claim 1, wherein a concave portion or a convex portion is provided on an outer peripheral surface formed in a cylindrical shape.

4. The threaded fixing bracket according to claim 1, wherein a metal plate in which at least the thread is formed by pressing is formed into a cylindrical shape by bending.

5. The threaded fixture according to claim 4, wherein the thread is formed separately for each inner peripheral plane of the inner hole in a direction along a ridge line of the thread.

[6] The screw threads are not arranged at positions adjacent to the direction along the ridge line of the screw threads and the direction along the pitch of the screw threads! /, And so on! The threaded fastener according to claim 4, which is arranged at the position of! /.

[7] The threaded fixing bracket according to [1], wherein the opening of the internal hole is provided with a non-threaded portion in which no thread is formed.