WO2018073958A1

WO2018073958A1 - Staking structure, assembled product formed by staking, and staking method

Info

Publication number: WO2018073958A1
Application number: PCT/JP2016/081284
Authority: WO
Inventors: 明紀塚口; 洋己赤塚
Original assignee: 三菱電機株式会社
Priority date: 2016-10-21
Filing date: 2016-10-21
Publication date: 2018-04-26
Also published as: JPWO2018073958A1; JP6745893B2

Abstract

This staking structure is provided with: a member (2) having a polygonal through-hole (2b); a shaft (3a) passed through the through-hole (2b) and affixed to the member (2) by staking; and one or more recesses (5) intermittently provided along the peripheral edge of an opening of the through-hole (2b).

Description

Caulking structure, caulking assembly and caulking method

The present invention relates to a caulking structure, a caulking assembly product, and a caulking method for caulking a shaft and fixing it to a member.

2. Description of the Related Art Conventionally, a method of passing a metal shaft through a through hole provided in a member to be assembled and fixing the shaft to the member by caulking the end of the shaft protruding from the through hole by plastic deformation has been widely used.
For example, Patent Document 1 describes a caulking method in which a through hole is formed in a polygon and caulking is performed so that an end of a shaft passing through the through hole is plastically deformed into substantially the same shape as the polygon.
The sides of the shaft that are plastically deformed to have approximately the same shape as the polygon come into contact with the corresponding sides of the polygonal through hole, so that the shaft can withstand high rotational torque.

JP 2002-248531 A

However, in the caulking structure described in Patent Document 1, the shaft plastically deformed into a polygon only comes into surface contact with the polygonal inner wall surface of the through hole, and the allowable side pressure cannot be increased.
Further, in the caulking structure described in Patent Document 1, since the movement of the shaft in the pulling direction is restricted only at the portion where the shaft portion that is wider than the opening diameter of the through hole and the opening peripheral portion of the through hole are in contact with each other, The allowable pulling force cannot be increased.

SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object thereof is to obtain a caulking structure, a caulking assembly, and a caulking method that can increase an allowable lateral pressure and an allowable pulling force.

The caulking structure according to the present invention includes a member having a polygonal through-hole, a shaft that is passed through the through-hole and fixed to the member by caulking, and is intermittently provided along the opening peripheral edge of the through-hole. Alternatively, a plurality of recesses are provided.

According to the present invention, the allowable side pressure and the allowable pulling force can be increased by the shaft plastically deformed by caulking entering the recess.

It is a perspective view which shows the caulking assembly | attachment goods which concern on Embodiment 1 of this invention. It is a side view which shows the state which passed the axis | shaft in Embodiment 1 through the through-hole. FIG. 3 is a side view showing a caulking assembly product in the first embodiment. FIG. 4A is a top view showing an example of a conventional caulking structure (before caulking). FIG. 4B is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line AA in FIG. 4A. FIG. 5A is a top view showing another example (before caulking) of a conventional caulking structure before caulking. FIG. 5B is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line BB in FIG. 5A. 6A is a perspective view showing a through hole (example 1) of a caulking structure according to Embodiment 1. FIG. FIG. 6B is a top view showing the caulking structure (before caulking) of FIG. 6A. 6C is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line CC in FIG. 6B. FIG. 7A is a perspective view showing a through hole (example 2) having a caulking structure according to the first embodiment. FIG. 7B is a top view showing the caulking structure (before caulking) of FIG. 7A. FIG. 7C is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line DD in FIG. 7B. FIG. 8A is a top view showing a through hole (example 3) having a caulking structure. FIG. 8B is a top view showing a through hole (Example 4) having a caulking structure. FIG. 8C is a top view showing a through hole (Example 5) having a caulking structure. FIG. 9A is a top view showing a through hole (Example 6) having a caulking structure. FIG. 9B is a top view showing a through hole (Example 7) having a caulking structure.

Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a perspective view showing a caulking assembly 1 according to Embodiment 1 of the present invention. FIG. 2 is a side view showing a state in which the shaft 3 a is passed through the through hole of the member 2. FIG. 3 is a side view showing the caulking assembly 1. As shown in FIG. 1, the caulking assembly 1 is a member 2 and a member 3 fixed by a caulking portion 4, and is realized by, for example, a chassis component of an in-vehicle device.

The member 2 is provided with a through hole, and the member 3 is provided with a shaft 3a. As shown in FIG. 2, the shaft 3a is passed through the through-hole of the member 2, and the shaft 3a protruding from the through-hole is pressed from the axial direction and plastically deformed so as to spread in the outer diameter direction (caulking). Thereby, as shown in FIG. 3, the caulking portion 4 having the shaft 3a wider than the opening diameter of the through hole is formed, and the shaft 3a presses the inner periphery of the through hole inside the through hole. In this way, the member 2 and the member 3 are fixed, and the caulking assembly 1 is configured.

Here, a conventional caulking structure will be described.
FIG. 4A is a top view showing an example of a conventional caulking structure (before caulking), and a portion where the caulking portion 4 is formed is indicated by a broken line. FIG. 4B is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line AA in FIG. 4A.

In the conventional caulking structure shown in FIG. 4A, the through hole 2a of the member 2 is circular. By caulking the shaft 3a passed through the through hole 2a, as shown in FIG. 4B, the caulking portion 4 is formed, and the shaft 3a is plastically deformed so as to press the inner periphery of the through hole 2a.

As a method of increasing the allowable rotational torque of the caulking structure, the area where the plastically deformed shaft 3a presses the inner periphery of the through hole 2a is increased, that is, the opening diameter of the through hole 2a and the cross-sectional area of the shaft 3a are increased. Can be considered.
However, if the through-hole 2a and the shaft 3a are enlarged, the space of the caulking portion is increased by that amount, and there is a concern that the caulking assembly is increased in size.

FIG. 5A is a top view showing another example (before caulking) of a conventional caulking structure before caulking, and a portion where caulking portion 4 is formed is indicated by a broken line. FIG. 5B is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line BB in FIG. 5A.

In the conventional caulking structure shown in FIG. 5A, the through hole 2b of the member 2 is a polygon (regular hexagon). By caulking the shaft 3a passed through the through hole 2b, a caulking portion 4 is formed as shown in FIG. 5B, and the shaft 3a is plastically deformed into a polygonal shape inside the through hole 2b.

In this caulking structure, the side of the shaft 3a, which is plastically deformed and has substantially the same shape as the polygon, comes into contact with the corresponding side in the polygonal through hole 2b. For this reason, the shaft 3a can withstand a higher rotational torque than the structure shown in FIGS. 4A and 4B.

However, since the shaft 3a plastically deformed into a polygon is only in surface contact with the polygonal inner wall surface of the through hole 2b, the allowable lateral pressure cannot be increased.
Furthermore, since only the contact portion between the opening peripheral edge portion of the through hole 2b and the caulking portion 4 opposes the force in the pulling direction of the shaft 3a, the allowable pulling force cannot be increased.

Therefore, in the caulking structure according to Embodiment 1, recesses are provided intermittently along the peripheral edge of the through hole 2b. With this configuration, the shaft 3a plastically deformed by caulking also enters the recess, so that the allowable side pressure and the allowable pulling force can be increased.

FIG. 6A is a perspective view showing a through hole (example 1) having a caulking structure according to the first embodiment. FIG. 6B is a top view showing the caulking structure (before caulking) of FIG. 6A, and the portion where the caulking portion 4 is formed is indicated by a broken line. 6C is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line CC in FIG. 6B.

In the caulking structure (example 1) according to the first embodiment, as shown in FIGS. 6A and 6B, the through hole 2b of the member 2 is a polygon (regular hexagon). Further, the member 2 is formed with

recesses

5, 5 and 5 intermittently along the opening peripheral edge of the through hole 2b on the side where the shaft 3a is caulked.

As shown in FIG. 6A, the recess 5 is a recess in which the inner wall surface of the through hole 2b is recessed from the peripheral edge of the opening to the middle of the caulking side. For example, the sheet metal constituting the member 2 is about half the plate thickness. It is a thing dented to. As the concave portion 5, a concave portion formed with a stamp or the like can be used. The locations where the recesses 5 are provided are polygonal sides at the opening peripheral edge of the through-hole 2b, and as shown in FIGS. 6A and 6B, each of the three adjacent sides in the hexagon of the through-hole 2b. A recess 5 is provided.

As a procedure of the caulking method according to the first embodiment, the shaft 3a is passed through the through hole 2b, and the shaft 3a is caulked on the side where the recess 5 is provided. 6C, the shaft 3a is plastically deformed into a polygonal shape inside the through hole 2b, and the plastically deformed shaft 3a enters the recess 5. That is, the plastically deformed shaft 3a is in a state of pressing the inner wall surface of the through hole 2b and is in contact with the bottom surface portion and the inner peripheral portion of the recess 5.

In the caulking structure (example 1) according to the first embodiment, in addition to the frictional force of the portion where the opening peripheral edge portion of the through hole 2b and the caulking portion 4 are in contact, the portion of the shaft 3a that has entered the recess 5 serves as a detent. Therefore, the allowable rotational torque can be increased.

In addition to the surface contact between the plastically deformed shaft 3a and the inner wall surface of the through hole 2b, the portion of the shaft 3a that has entered the recess 5 due to plastic deformation and the side wall of the recess 5 are in contact with each other. The applied side pressure per unit area can be reduced. Thereby, the allowable lateral pressure can be increased as compared with the conventional caulking structure.

Further, in the caulking structure according to the first embodiment, in addition to the portion where the opening peripheral edge portion of the through hole 2b and the caulking portion 4 are in contact, the portion where the shaft 3a and the recess 5 are in contact with each other in the drawing direction of the shaft 3a. Since the movement is restricted, the allowable pulling force can be increased as compared with the conventional caulking structure.

Moreover, the through-hole 2b has three or more inner wall surfaces which the outer peripheral part of the axis | shaft 3a contacts as shown to FIG. 6B. Thereby, since the center of the shaft 3a is determined by the inner wall surface of the through hole 2b, the accuracy of the shaft center can be improved.
6A to 6C show the case where the through hole 2b is a regular hexagon, it may be a triangle, a quadrangle, a pentagon, or a heptagon or more.
In other words, it may be a polygon having three or more inner wall surfaces with which the outer peripheral portion of the shaft 3a contacts.

FIG. 7A is a perspective view showing a through hole (example 2) having a caulking structure according to the first embodiment. FIG. 7B is a top view showing the caulking structure (before caulking) of FIG. 7A, and a portion where the caulking portion 4 is formed is indicated by a broken line. FIG. 7C is a cross-sectional arrow view showing a state in which the caulking structure (after caulking) is cut along the line DD in FIG. 7B.

In the caulking structure (example 2) according to the first embodiment, the through hole 2b of the member 2 is a polygon (regular hexagon) as shown in FIGS. 7A and 7B. Further, the member 2 is formed with

recesses

6, 6 and 6 intermittently along the opening peripheral edge of the through hole 2b on the side where the shaft 3a is caulked.

As shown in FIG. 7A, the concave portion 6 is a concave portion in which the inner wall surface of the through hole 2b is recessed from the opening peripheral edge portion to the opening peripheral edge portion on the opposite side.
As in the case of the concave portion 5, the concave portion 6 is provided on a polygonal side portion at the opening peripheral edge portion of the through hole 2b. As shown in FIGS. 7A and 7B, the hexagonal shape of the through hole 2b is not adjacent 3 A recess 6 is provided in each of the two sides.

As a procedure of the caulking method according to the first embodiment, the shaft 3a is passed through the through hole 2b, and the shaft 3a is caulked on the side where the recess 6 is provided. 7C, the shaft 3a is plastically deformed into a polygonal shape inside the through hole 2b, and the plastically deformed shaft 3a enters the recess 6. That is, the plastically deformed shaft 3 a is in a state of pressing the inner wall surface of the through hole 2 b and in contact with the inner peripheral portion of the recess 6.

In the caulking structure (example 2) according to the first embodiment, in addition to the frictional force of the portion where the opening peripheral edge portion of the through hole 2b and the caulking portion 4 are in contact, the plastically deformed shaft 3a is more axial than the concave portion 5. It enters the concave portion 6 that is long in the direction and becomes a detent. For this reason, the allowable rotational torque can be increased as compared with the configuration in which the concave portion 5 is provided.

In addition to the surface contact between the plastically deformed shaft 3a and the inner wall surface of the through hole 2b, the portion of the shaft 3a that has entered the recess 6 due to plastic deformation and the side wall of the recess 6 are in contact with each other. The applied side pressure per unit area can be reduced. Thereby, the allowable lateral pressure can be increased as compared with the conventional caulking structure.

Further, in addition to the portion where the opening peripheral edge of the through hole 2b and the caulking portion 4 are in contact, the portion where the shaft 3a and the recess 6 are in contact regulates the movement of the shaft 3a in the pulling direction, so that the conventional caulking structure is achieved. In comparison, the allowable pulling force can be increased.

Also in the caulking structure (example 2) according to the first embodiment, as shown in FIG. 7B, the through hole 2b has three or more inner wall surfaces with which the outer periphery of the shaft 3a contacts. Thereby, since the center of the shaft 3a is determined by the inner wall surface of the through hole 2b, the accuracy of the shaft center can be improved.
7A to 7C show the case where the through hole 2b is a regular hexagon, it may be a triangle, a quadrangle, a pentagon, or a heptagon or more.
In other words, it may be a polygon having three or more inner wall surfaces with which the outer peripheral portion of the shaft 3a contacts.

Although the configuration in which the recesses 5 are provided in each of the three non-adjacent sides of the hexagon of the through hole 2b is shown, the recess 5 is provided only in one hexagonal side of the through hole 2b as shown in FIG. 8A. May be provided (Example 3). Even if comprised in this way, a permissible rotational torque, permissible side pressure, and permissible extraction force can be raised.
In addition, even if it provides the recessed part 6 instead of the recessed part 5 in the structure shown to FIG. 8A, the effect similar to the above can be acquired.

As shown in FIG. 8B, the recesses 5 may be provided on all of the hexagonal sides of the through-hole 2b (Example 4). Even if comprised in this way, a permissible rotational torque, permissible side pressure, and permissible extraction force can be raised.
In addition, even if it provides the recessed part 6 instead of the recessed part 5 in the structure shown to FIG. 8B, the effect similar to the above can be acquired.

As shown in FIG. 8C, a plurality of recesses 5 may be provided on one side of the hexagon of the through hole 2b (Example 5). Even if comprised in this way, a permissible rotational torque, permissible side pressure, and permissible extraction force can be raised.
In addition, even if it provides the recessed part 6 instead of the recessed part 5 in the structure shown to FIG. 8C, the effect similar to the above can be acquired.

Moreover, as shown to FIG. 9A, you may provide both the recessed part 5 and the recessed part 6 in the opening peripheral part of the through-hole 2b. In the example of FIG. 9A, the recess 5 is provided in each of two sides of the three sides that are not adjacent to each other in the hexagon of the through hole 2b, and the recess 6 is provided in the remaining sides.
Even if comprised in this way, a permissible rotational torque, permissible side pressure, and permissible extraction force can be raised.

Furthermore, as shown to FIG. 9B, both the recessed part 5 and the recessed part 6 are provided with respect to one side part in the hexagon of the through-hole 2b.
Even if comprised in this way, a permissible rotational torque, permissible side pressure, and permissible extraction force can be raised.

In the description so far, the case where the target to which the member 2 is assembled is the member 3, but the target to which the member 2 is assembled may be only the shaft 3a. That is, the caulking structure according to the first embodiment can be applied even when caulking is performed on both ends of the shaft 3a.

As described above, the caulking structure according to Embodiment 1 is intermittent along the member 2 having the polygonal through hole 2b, the shaft 3a fixed to the member 2 by caulking, and the opening peripheral edge of the through hole 2b. The recessed part 5 (or recessed part 6) provided in this way is provided.
In this configuration, the recessed portion 5 is a recessed portion in which the inner wall surface of the through hole 2b is recessed from the opening peripheral portion to the middle of the side where the shaft 3a is caulked. Moreover, the recessed part 6 is a recessed part in which the inner wall face of the through-hole 2b was recessed from the opening peripheral part to the opening peripheral part on the opposite side.
With this configuration, the shaft 3a plastically deformed by caulking also enters the recess 5 (or the recess 6), so that the allowable side pressure and the allowable pulling force can be increased.

Further, in the caulking structure according to the first embodiment, the recess 5 (or the recess 6) is provided in one or more sides of the polygon in the opening peripheral edge of the through hole 2b. With this configuration, the plastically deformed shaft 3a is in a state of pressing the inner wall surface of the through hole 2b and in contact with the inner peripheral portion of the recess 5 (or the recess 6). Thereby, the allowable side pressure and the allowable pulling force can be increased.

Furthermore, in the caulking structure according to the first embodiment, the through hole 2b has three or more inner wall surfaces with which the outer peripheral portion of the shaft 3a contacts. By comprising in this way, since the center of the axis | shaft 3a is decided by the inner wall face of the through-hole 2b, the precision of an axis center can be improved.

Furthermore, since the caulking assembly 1 according to the first embodiment includes the caulking structure according to the first embodiment, it is possible to provide the caulking assembly 1 that can obtain the above-described effect.

Furthermore, in the caulking method according to Embodiment 1, the shaft 3a is passed through the through hole 2b in the member 2 having the polygonal through hole 2b and the concave portion 5 (or 6), and the concave portion 5 (or 6) is provided. The shaft 3a is fixed to the member 2 by caulking the shaft 3a on the side. Thereby, the caulking assembly 1 which can acquire the said effect can be provided.

In the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

Since the caulking structure according to the present invention can increase the allowable side pressure and the allowable pulling force, it is suitable for, for example, assembling a chassis of an in-vehicle device in which vibrations in various directions are applied by the movement of the vehicle.

1 Caulking assembly, 2, 3 member, 2a, 2b through hole, 3a shaft, 4 caulking part, 5, 6 recess.

Claims

A member having a polygonal through hole;
A shaft that is passed through the through hole and fixed to the member by caulking;
A caulking structure comprising one or a plurality of recesses provided intermittently along an opening peripheral edge of the through hole.
2. The caulking structure according to claim 1, wherein the one or more recesses are recesses in which an inner wall surface of the through hole is recessed from an opening peripheral edge partway to a side where the shaft is caulked.
The caulking structure according to claim 1, wherein the one or more recesses are recesses in which the inner wall surface of the through hole is recessed from the opening periphery to the opening periphery on the opposite side.
The caulking structure according to claim 1, wherein the one or more recesses are provided on one or more sides of a polygon in an opening peripheral edge of the through hole.
The caulking structure according to claim 1, wherein the through hole has three or more inner wall surfaces with which the outer peripheral portion of the shaft contacts.
A caulking assembly comprising the caulking structure according to claim 1.
Passing a shaft through the through-hole in a member having a polygonal through-hole and one or a plurality of concave portions provided intermittently along the opening peripheral edge of the through-hole;
And a step of fixing the shaft to the member by caulking the shaft on the side on which the one or more recesses are provided.