JP2013113396A - Press fitting nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press fitting nut which can be attached by press fitting to a panel easily, and has high pushing strength.SOLUTION: A press fitting nut (10) attached to an attaching hole (31) of a panel (30) includes a nut body (11) in which a female screw is formed, having a through-hole (18) along the center axis of the press fitting nut, and a nut fixing portion (12) for fixing to the attaching hole of the panel, being formed in one side of the body. The nut fixing portion has a step portion (14) having an outer diameter larger than the inner diameter of the attaching hole of the panel, being adjacent to the body, a groove portion (15) having the outer diameter smaller than the inner diameter of the attaching hole of the panel, being adjacent to the step portion, and an insertion portion (16) of a truncated cone shape the upper end of which has the diameter larger the inner diameter of the attaching hole of the panel, the lower end of which has the outer diameter smaller than the inner diameter of the attaching hole of the panel, wherein in the insertion portion, a thread (21) of which the ridge line is inclined to the center axis is formed.

Description

  The present invention relates to a press-fit nut that is used to press and fix into a hole formed in a panel and to fix a screw member such as a bolt. In particular, it relates to a press-fit nut with high indentation strength.

  A press-fit nut used for fixing a member such as a bolt by being fixed to a hole formed in a panel by pressing is known. Such nuts are also called push nuts, press nuts, and clinching nuts. The press-fit nut has the advantage that it can be easily attached simply by pushing in, without the need for welding and screwing when attaching to the panel.

  1 is a front view of a conventional press-fit nut, FIG. 2 is a perspective view, and FIG. 3 is a cross-sectional view showing a state in which the press-fit nut is attached to a panel. The press-fit nut 50 includes a nut main body 51 and a nut fixing portion 52. The nut main body 51 has a hexagonal nut shape, the outer shape is hexagonal, and the ridge line portion is chamfered. The nut body 51 has a bottom surface 53. A through hole 58 is formed in the central portion of the nut body 51 in the direction of the central axis z. The through hole 58 has a female screw, and a bolt or the like can be screwed to the female screw. The nut fixing portion 52 has a cylindrical groove portion 55 adjacent to the nut body 51 and having a low height. The outer diameter of the groove 55 is smaller than the inner diameter 31d of the mounting hole 31 of the panel 30. Following the groove 55, a frustoconical insertion part (knurl part) 56 is provided at the lower end. The outer diameter of the lower end portion of the insertion portion 56 is smaller than the inner diameter 31 d of the attachment hole 31, but the outer diameter of the upper end portion of the insertion portion 56 adjacent to the groove portion 55 is larger than the inner diameter 31 d of the attachment hole 31. An inclined thread 57 is formed on the side surface of the insertion portion 56.

  FIG. 3 is a side view showing a state in which the press-fit nut 50 is attached to the panel 30. When the press-fit nut 50 is attached to the panel 30, the lower end portion of the insertion portion 56 of the press-fit nut 50 is inserted into the mounting hole 31 of the panel 30, and the press-fit nut 50 is pushed in. When pushed to the upper end of the insertion portion 56, the insertion portion 56 deforms the side portion of the mounting hole 31 of the panel 30, and the deformed material of the panel 30 enters between the threads 57 of the insertion portion 56. . By entering between the threads 57 of the insertion portion 56, the rotation of the nut 50 is prevented. Thus, the press-fit nut 50 is attached to the panel 30. The bottom surface 53 of the nut body 51 stops in contact with the upper surface of the panel 30 and is not pushed further in, so the panel 30 is not deformed. Therefore, the material of the panel 30 deformed by the insertion portion 56 is difficult to enter the groove portion 55 above the insertion portion 56. Therefore, when the nut 50 is attached to the panel 30 and the bolt is screwed to the nut 50 or when a force is applied to the bolt in the screwed state, the nut 50 is easily detached from the panel 30.

  Such a press-fit nut can be easily attached by being pushed into the panel, but is insufficient in terms of the fixing strength of the nut.

  Patent document 1 discloses the conventional press-fit nut shown in FIGS. Disclosed is a press-fit fixed nut having a tubular portion coaxially with a screw hole on the bottom surface of a hexagon nut, and having a tubular engaging portion spaced from the bottom surface at the distal end portion of the tubular portion and having a circumferential surface forming a conical surface. A knurled inclined in one direction is formed in the tubular engaging portion.

  In Patent Document 2, the first tooth portion in which the concave portion and the convex portion are formed at equal intervals in the circumferential direction on the seat surface side of the nut body, and the convex portion is located in the concave portion of the first tooth portion. A press-fit nut is disclosed in which a concave portion and a convex portion are integrally formed with a second tooth portion formed at equal intervals in the circumferential direction so that the concave portion is positioned on the convex portion of the portion. In Patent Document 2, since the positions of the concave portion and the convex portion of the first tooth portion and the second tooth portion are shifted, the pulling force in the axial direction can be improved.

  Patent Document 3 discloses a push nut including a main body and a nut fixing portion, and the nut fixing portion includes an insertion portion on the distal end side, a groove portion adjacent to the insertion portion, and a push portion between the groove portion and the nut main body. To do. The insertion portion is formed in a truncated cone, and a tooth shape is formed on the inclined side surface. A pushing portion is formed on the bottom surface of the nut body. Patent Document 3 can prevent the rotation of the nut.

Although patent documents 1-3 aim at obtaining the press-fit nut with high indentation strength, indentation strength was still inadequate.
Therefore, there has been a demand for a press-fit nut that can be easily attached to the hole of the panel and has high indentation strength.

Japanese Utility Model Publication No. 62-13021 JP-A-7-15126 Japanese Utility Model Publication No. 63-35809

  Accordingly, an object of the present invention is to provide a press-fit nut that can be easily attached to a panel and has high indentation strength.

One aspect of the present invention is a press-fit nut that is press-fit into a mounting hole of a panel,
A nut body formed with a female screw and having a through-hole along the central axis of the press-fit nut;
A nut fixing portion that is formed on one side of the main body and is fixed to a mounting hole of the panel, and the nut fixing portion is
A step portion adjacent to the nut body and having an outer diameter larger than an inner diameter of the mounting hole of the panel;
A groove portion adjacent to the stepped portion and having an outer diameter smaller than the inner diameter of the mounting hole of the panel;
Adjacent to the groove portion, the upper end portion has an outer diameter smaller than the outer diameter of the stepped portion and has an outer diameter larger than the inner diameter of the mounting hole of the panel, and the lower end portion is smaller than the inner diameter of the mounting hole of the panel. A frusto-insertion nut having a frustoconical insertion portion having an outer diameter, wherein a thread having an inclined ridge line with respect to the central axis is formed in the insertion portion.

  Thereby, the material which the panel deform | transformed by the insertion part enters between the screw threads of an insertion part, and rotation of a press-fit nut is prevented. Furthermore, the panel material deformed by the step portion enters the groove portion and also enters between the threads of the insertion portion. Therefore, the press-fit nut is firmly attached to the panel.

A thread having a ridge line inclined with respect to the central axis may be formed on the outer periphery of the stepped portion.
It is preferable that the thread portion of the outer peripheral portion of the step portion is located in the thread valley portion of the insertion portion.
If it carries out like this, it will become easy for the material of the panel deform | transformed by the step part to enter between the threads of an insertion part.
A thread may not be formed on the outer periphery of the stepped portion.

In the lower surface of the insertion portion of the press-fit nut, it is preferable that the angle of one inclined line of the thread of the insertion portion is different from the angle of the other inclined line.
It is preferable that an angle of the one inclined line of the screw thread of the insertion portion is 50 to 90 °, and an angle of the other inclined line is 25 to 35 °.
The angle of the one inclined line is more preferably 60 to 80 °.
This further increases the pressing strength of the press-fit nut.

It is preferable that an inclination angle at which the ridge line of the screw thread of the insertion portion is inclined with respect to the central axis is 50 to 70 °.
The tilt angle is more preferably 55 to 65 °.
This further increases the pressing strength of the press-fit nut.

  According to the present invention, it is possible to obtain a press-fit nut that can be easily attached to the hole of the panel and has high indentation strength.

It is a front view of the conventional press-fit nut. It is a perspective view of the press-fit nut of FIG. It is sectional drawing which shows the state which attached the press-fit nut of FIG. 1 to the panel. It is sectional drawing for demonstrating the measuring method of indentation strength. It is a front view of the press fit nut of the 1st embodiment of the present invention. It is sectional drawing of the press-fit nut of FIG. It is sectional drawing which shows the state which attached the press-fit nut of FIG. 5 to the panel. It is an expanded sectional view of A part of FIG. It is sectional drawing which shows the state which attached the other panel with the volt | bolt to the panel with a press-fit nut of FIG. It is the perspective view which looked at the press-fit nut of FIG. 5 from diagonally downward. FIG. 10 is an enlarged perspective view of a portion B in FIG. 9. It is the perspective view which looked at press fit nut 10 'of the 2nd Embodiment of this invention from diagonally downward. It is an expansion perspective view of the C section of FIG. (a) is a thread shape of the insertion part of the conventional press fit nut, (b) is a figure which shows the screw thread shape of the insert part of the press fit nut of 1st, 2nd embodiment of this invention. It is a front view of the press fit nut of the 2nd Embodiment of this invention.

Before describing the embodiment of the present invention, a method for measuring the indentation strength of a press-fit nut or the like will be described. FIG. 4 is a cross-sectional view for explaining a method for measuring indentation strength.
For measuring the indentation strength, a sample in which a press-fit nut 50 is attached to the panel 30 is used. An internal thread is formed in the through hole 58 that penetrates the nut main body 51 and the nut fixing portion 52, and the bolt 40 is inserted from the nut fixing portion 52 side. A jig 44 having a hole 45 having an inner diameter larger than the outer diameter of the nut body 51 is prepared. With the press-fit nut 50 attached to the panel 30, the nut body 51 side is set downward and the head 41 of the bolt 40 is set up so that the press-fit nut 50 is inserted into the hole 45 of the jig 44.

In this state, the strength at which the head 41 of the bolt 40 is pushed from above and the press-fit nut 50 is detached from the panel 30 is referred to as pushing strength.
In the actual assembly process, when the bolt 40 is inserted and attached to the press-fit nut 50 attached to the panel 30, the press-fit nut 50 may come off the panel 30. Further, if a force is applied to the head 41 of the bolt 40 with the bolt 40 attached to the press-fit nut 50, the press-fit nut 50 may come off. It is necessary that the press-fit nut 50 does not come off the panel 30 during such work. Therefore, the indentation strength is a measure of the strength of attaching the press-fit nut 50 to the panel 30.

Hereinafter, a press-fit nut 10 according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 5 is a front view of the press-fit nut 10 according to the first embodiment of the present invention, and FIG. 6 is a sectional view thereof. The press-fit nut 10 includes a nut body 11 and a nut fixing portion 12. The nut main body 11 has a hexagonal nut shape, the outer shape is hexagonal, and the ridge line portion is chamfered. The nut body 11 has a bottom surface 13. A through hole 18 is formed in the central portion of the nut body 11 in the direction of the central axis z, and a female screw is formed in the through hole 18 so that a bolt or the like can be screwed.

The nut fixing part 12 is a part for fixing the press-fit nut 10 to the panel 30. The nut fixing portion 12 includes a step portion 14, a groove portion 15, and an insertion portion 16. A cylindrical step 14 having a low height is formed adjacent to the nut body 11. The outer diameter of the stepped portion 14 is larger than the inner diameter 31d of the mounting hole 31 of the panel 30, and when the press-fit nut 10 is pushed into the panel 30, the stepped portion 14 can deform the material of the panel 30 around the mounting hole 31. . On the side surface of the stepped portion 14, a thread 22 that is inclined as viewed from the front is formed. The outer diameter of the circle connecting the tops of the threads 22 of the stepped portion 14 is larger than the inner diameter 31 d of the mounting hole 31 of the panel 30. The outer diameter of the circle connecting the valleys of the threads 22 of the stepped portion 14 is preferably larger than the inner diameter 31d of the mounting hole 31 of the panel 30.
A thin cylindrical groove 15 is formed under the step 14. The outer diameter of the groove portion 15 is smaller than the outer diameter of the step portion 14 and smaller than the inner diameter 31 d of the mounting hole 31 of the panel 30. When the press-fit nut 10 is pushed into the panel 30, the material of the panel 30 deformed by the step portion 14 enters the groove portion 15.

Following the groove 15, a frustoconical insertion portion 16 having a low height is formed at the lower end. The outer diameter of the lower end portion of the insertion portion 16 is smaller than the outer diameter of the upper end portion. The outer diameter of the upper end portion of the insertion portion 16 is smaller than the outer diameter of the step portion 14. If the outer diameter of the step portion 14 is larger than the outer diameter of the upper end portion of the insertion portion 16, the mounting hole 31 pushed and expanded by the insertion portion 16 can be further expanded by the step portion 14.
The outer diameter of the lower end portion of the insertion portion 16 is smaller than the inner diameter 31 d of the attachment hole 31, but the outer diameter of the upper end portion of the insertion portion 16 adjacent to the groove portion 15 is larger than the inner diameter 31 d of the attachment hole 31. Therefore, when the press-fit nut 10 is pushed into the mounting hole 31 of the panel 30, the inner circumference of the mounting hole 31 is deformed outward and downward.

A thread 21 that is inclined with respect to the central axis z of the press-fit nut 10 when viewed from the front is formed on the side surface of the insertion portion 16 (21 in FIG. 5 indicates the position of the ridge line of the thread). The outer diameter of the circle connecting the tops of the threads 21 at the lower end of the insertion portion 16 is smaller than the inner diameter 31 d of the mounting hole 31. The outer diameter of the circle connecting the tops of the threads 21 at the upper end of the insertion part 16 adjacent to the groove part 15 is larger than the inner diameter 31d of the mounting hole 31. It is preferable that the outer diameter of the circle connecting the valleys of the thread 21 at the upper end of the insertion portion 16 is larger than the inner diameter 31 d of the mounting hole 31.
The through-hole 18 of the press-fit nut 10 is continuous from the nut main body 11 to the insertion portion 16, and a female screw is continuously formed.

FIG. 7 is a cross-sectional view showing a state in which the press-fit nut 10 is attached to the panel 30. When the press-fit nut 10 is attached to the panel 30, the lower end portion of the insertion portion 16 of the press-fit nut 10 is inserted into the mounting hole 31 of the panel 30, and the press-fit nut 10 is pushed in.
FIG. 8 is an enlarged cross-sectional view of a portion A in FIG. When the insertion hole 16 is pushed down to the upper end of the insertion portion 16, the insertion portion 16 deforms the side portion of the attachment hole 31 of the panel 30, and the deformed material of the panel 30 is deformed by the thread 21 of the insertion portion 16. Get in between. When the deformed material enters between the threads 21 of the insertion portion 16, rotation of the nut 10 is prevented. When the press-fit nut 50 is further pushed in, the stepped portion 14 comes into contact with the upper surface around the mounting hole 31 of the panel 30, and the material of the panel 30 around the mounting hole 31 is pushed downward. , Get into the groove 15. The material deformed by the step portion 14 also enters between the screw threads 21 of the insertion portion 16. Therefore, the press-fit nut 10 is firmly attached to the panel 30.

  As the material of the press-fit nut 10, any material that can be plastically deformed can be used. For example, iron or aluminum. Further, the press-fit nut 10 may be subjected to a surface treatment as long as it can resist deformation. For example, it may be plated to prevent rust. Any material other than metal can be used as long as the material is plastically deformed.

FIG. 9 is a cross-sectional view showing a state in which another panel 35 is attached by a bolt 40 using the press-fit nut 10 attached to the panel 30 of FIG. The other panel 35 is overlapped so that the attachment hole 31 of the panel 30 and the attachment hole 36 of the other panel 35 are located below the panel 30 of FIG. The bolt 40 is inserted into the mounting hole 36 and the mounting hole 31 from the other panel 35 side, and the bolt 40 is screwed into the through hole 18 of the press-fit nut 10. The surface of the head 41 of the bolt 40 is in contact with the surface of the other panel 35, and the other panel 35 is fixed to the panel 30.
Alternatively, although not shown, unlike FIG. 9, another panel 35 is arranged on the upper side of the press-fit nut 10 of FIG. The panel 35 can also be fixed.

  Here, the thread 22 of the step portion 14 and the thread 21 of the insertion portion 16 will be described. FIG. 10 is a perspective view of the press-fitting nut 10 according to the first embodiment of the present invention viewed obliquely from below, and FIG. 11 is an enlarged perspective view of a portion B in FIG. An inclined thread 22 is formed on the side surface of the stepped portion 14. An inclined thread 21 is formed on the side surface of the insertion portion 16. When the press-fit nut 10 is viewed from below, the thread 22 of the stepped portion 14 is arranged so as to be located between the threads 21 of the insertion portion 16, that is, in the valley. In this way, the material deformed by the thread 22 of the step portion 14 enters the valley between the threads 21 of the insertion portion 16 without being blocked by the thread 21 of the insertion portion 16.

  FIG. 12 is a perspective view of the press-fit nut 10 ′ according to the second embodiment of the present invention as viewed obliquely from below, and FIG. 13 is an enlarged perspective view of a portion C in FIG. The second embodiment is substantially the same as the first embodiment, and only differences from the first embodiment will be described. In the second embodiment, no thread is formed on the side surface of the stepped portion 14 ′, and the stepped portion 14 ′ has a low cylindrical shape. The outer diameter of the stepped portion 14 ′ is larger than the inner diameter of the mounting hole 31 of the panel 30. The groove 15 is the same as in the first embodiment. The insertion portion 16 is the same as that of the first embodiment, and a thread 21 that is inclined on the side surface is formed.

In the second embodiment, the material of the panel deformed by the step portion 14 ′ enters the groove portion 15 by pressing the press-fit nut 10 ′.
The outer diameter of the stepped portion 14 ′ is larger than the outer diameter of the circle connecting the crests of the thread 21 at the upper end of the insertion portion 16. Therefore, the panel material deformed by the stepped portion 14 ′ enters the valley portion between the screw threads 21 of the insertion portion 16.
Thus, the press-fit nut 10 ′ is firmly fixed to the panel 30.

  A conventional press-fit nut 50 without a stepped portion 14 'and a press-fit nut 10' having a stepped portion 14 'without a thread and other conditions are the same, and comparing the indentation strength, the stepped portion 14' Compared with the conventional press-fit nut 50 without ', the push-in strength of the press-fit nut 10' with the stepped portion 14 'is improved by about 60%.

(Thread shape)
When the insertion portion of the press-fit nut is viewed from below, as shown in FIG. 14A, the angles α and β of the left and right inclined lines of the thread of the insert portion 56 of the conventional press-fit nut 50 are the same. That is, the thread shape was an isosceles triangle. In the first and second embodiments of the present invention, when the insertion portion 16 of the press-fit nut 10 is viewed from below, the thread 21 of the insert portion 16 of the press-fit nut 10 is shown in FIG. It is a shape. That is, the thread 21 of the insertion portion 16 of the press-fit nut 10 has different angles of the right and left inclined lines of the thread. The angle formed by one inclined line g1 of the thread with respect to the tangent t1 in contact with this circle at the position where one inclined line of the thread intersects with a circle passing through the valley of the thread 21, and the other inclined line If the angle between the tangent t2 in contact with the circle passing through the trough of the screw thread 21 and the other inclined line at the position where the line g2 intersects the circle passing through the trough of the screw thread 21 is β, the angle α and the angle β are Different.
Although the angle of the inclined line on the lower surface of the insertion portion 16 of the press-fit nut 10 has been described, the angle of the inclined line in the cross section perpendicular to the central axis z of the insertion portion 16 is the same as the angle of the inclined line on the lower surface of the insertion portion 16. is there.
The inclined line refers to a line drawn from the bottom of the thread valley to the top of the peak in the cross section perpendicular to the central axis z. On the lower surface of the insertion part, it refers to a line from the bottom of the thread valley to the top of the peak.

The angle β is preferably 50 to 90 ° and is preferably closer to 90 °, but is preferably 60 to 80 ° in consideration of manufacturing conditions. The angle α is preferably in the range of 25-30 °.
When measuring the indentation strength of the press-fit nut by the indentation strength measurement method shown in FIG. 4, when the bolt 40 is depressed, the panel material around the panel mounting hole is in the downward direction in FIG. 4 (upward direction in FIG. 5). Pressed. Since the thread 21 is inclined, the material of this panel tends to move in the direction indicated by the arrow F in FIG. 14B in the cross section perpendicular to the central axis z of the press-fit nut 10. Therefore, when the angle β is large and close to 90 °, it acts to prevent the movement of the panel material, and as a result, the pushing force increases.

(Thread inclination angle)
FIG. 15 is a front view of a press-fit nut according to a second embodiment of the present invention. That is, the stepped portion 14 ′ has no thread. The inclination angle of the thread 21 of the insertion portion 16 will be described with reference to the drawing of the press-fit nut of the second embodiment. In the first embodiment, the thread 21 of the insertion portion 16 is the same as that of the second embodiment. Since this is the same, this explanation also applies to the first embodiment.
As shown in FIG. 15, the inclination angle θ of the thread 21 of the insertion portion 16 of the press-fit nut 10 is the center axis z of the press-fit nut 10 in the front view of the press-fit nut 10, and the ridge line of the thread 21 is centered. The angle is inclined with respect to the axis z. Usually, the inclination angle θ of the thread 21 of the press-fit nut 10 is about 45 °. The ridge line is a line connecting the tops of the threads.

As described with reference to FIG. 4, when the indentation strength is measured, a force G is applied to the press-fit nut 10 in the upward direction of FIG. Since the panel material has entered between the screw threads 21 of the insertion portion 16, the greater the inclination angle θ of the screw threads 21, the greater the resistance to the upward force G, and the higher the push-in strength.
In the first and second embodiments of the present invention, the inclination angle θ of the screw thread 21 is in the range of 50 to 70 °, and the greater the inclination angle θ, the higher the indentation strength. However, the inclination angle θ is preferably in the range of 55 to 65 ° in view of the function of the product.

According to the second embodiment, the angle α and β of the thread 21 of the press-fit nut are both 45 ° press-fit nuts, the thread 21 of the press-fit nut is a sawtooth, the angle α is 70 °, the angle β is 30 °, etc. A press-fit nut with the same conditions was prepared, and the indentation strength was compared. The press-fit nut with an angle α of 70 ° and an angle β of 30 ° compared to the press-fit nut of 45 ° for both angles α and β The indentation strength was improved by about 10%.
A press-fit nut having an inclination angle θ of 45 ° for the screw thread 21 and a press-fit nut 10 having the same inclination angle θ of the screw thread 21 for 60 ° and the other conditions being the same were prepared. Compared with a 45 ° press-fit nut, the press-fit nut with an inclination angle θ of 60 ° further improved the indentation strength by about 10%.

  Thus, according to the embodiment of the present invention, a press-fit nut that can be easily attached to the hole of the panel and has high indentation strength can be obtained.

10 Press-fit nut
11 Nut body
12 Nut fixing part
13 Bottom
14 steps
15 Groove
16 Insertion section
18 Through hole
21 Thread
22 Thread
30 panels
31 Mounting hole
35 Other panels
36 Mounting hole
40 volts
41 head
44 Jig
45 holes
50 Press-fit nut
51 Nut body
52 Nut fixing part
53 Bottom
55 Groove
56 Insertion section
57 Thread
58 Through hole

Claims (8)

A press-fit nut that is press-fitted into the panel mounting hole,
A nut body formed with a female screw and having a through-hole along the central axis of the press-fit nut;
A nut fixing portion formed on one side of the main body and fixed to a mounting hole of the panel;
The nut fixing part is
A step portion adjacent to the nut body and having an outer diameter larger than an inner diameter of the mounting hole of the panel;
A groove portion adjacent to the stepped portion and having an outer diameter smaller than the inner diameter of the mounting hole of the panel;
Adjacent to the groove portion, the upper end portion has an outer diameter smaller than the outer diameter of the stepped portion and has an outer diameter larger than the inner diameter of the mounting hole of the panel, and the lower end portion is smaller than the inner diameter of the mounting hole of the panel. A frustoconical insertion portion having an outer diameter,
A press-fitting nut, wherein the insertion portion is formed with a thread having an inclined ridge line with respect to the central axis. The press-fit nut according to claim 1,
A press-fitting nut in which an outer peripheral portion of the step portion is formed with a thread having a ridge line inclined with respect to the central axis. The press-fit nut according to claim 2,
The thread portion of the outer peripheral portion of the step portion is a press-fit nut positioned in the thread valley portion of the insertion portion. The press-fit nut according to claim 1,
A press-fit nut in which the angle of one inclined line of the thread of the insert part and the angle of the other inclined line are different on the lower surface of the insert part of the press-fit nut. The press-fit nut according to claim 4,
The press-fit nut in which the angle of the one inclined line of the screw thread of the insertion portion is 50 to 90 °, and the angle of the other inclined line is 25 to 35 °. The press-fit nut according to claim 5,
A press-fit nut in which the angle of the one inclined line is 60 to 80 °. The press-fit nut according to claim 1,
A press-fit nut in which an inclination angle at which the ridge line of the screw thread of the insertion portion is inclined with respect to the central axis is 50 to 70 °. The press-fit nut according to claim 7,
The press-fit nut having an inclination angle of 55 to 65 °.

Images