JP3498539B2 - Press-fitting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for press-fitting a first member into a second member, and more particularly, to apply kinetic energy to at least one of the first member and the second member so as to approach each other. The present invention relates to a technique of applying and press-fitting a first member into a second member by collision.

[0002]

2. Description of the Related Art The press-fitting technique is a technique for press-fitting at least one of a first member and a second member by utilizing the inertia of the two members. This press-fitting technique is disclosed in Japanese Patent Laid-Open No. 9-66421.
It is described in Japanese Patent Publication No.

[0003]

In the press-fitting technique, a technique for stabilizing the press-fitting length of the two members is generally desired. In order to satisfy this demand, the present inventor has proposed, in the above-described press-fitting technique, a technique in which, at the end of press-fitting, the two members collide with each other at a stopper surface perpendicular to their approaching direction.

As one specific example of the proposed technique, as shown in FIG. 8, the first member 100 and the second member 102 are provided with stopper surfaces 104 and 106 which are perpendicular to the approaching direction thereof, respectively. Kinetic energy is applied to the member 100, variations in kinetic energy actually applied to the first member 100, variations in press-fitting margin S (see FIG. 9) of the first member 100 and the second member 102, and the first member 100 and the second member 100. Despite variations in the hardness of the material of the member 102, the first member 100 is applied with a size that ensures that the stopper surface 104 of the first member 100 collides with the stopper surface 106 of the second member 102, whereby at the end of press-fitting. 2 members 100,
102 a stopper surface 1 perpendicular to their approaching direction
This is a technique in which the devices 04 and 106 collide with each other.

However, in this proposed technique, the two members are made to collide with each other at the stopper surface perpendicular to the approaching direction at the end of the press fitting, so that the press fitting length L of the two members is made.
Fluctuates sensitively according to variations in kinetic energy, variations in press-fitting margin S, or variations in material hardness. Therefore, in this proposed technique, the press-fit length L may not be sufficiently stabilized due to the variation in the press-fit conditions. The details will be described below.

In the proposed technique, as described above,
In most cases, the magnitude of kinetic energy is set so that the first member 100 surely collides with the stopper surface 104 of the first member 100 against the stopper surface 106 of the second member irrespective of the variation in the press-fitting condition. Therefore, the kinetic energy larger than the truly required kinetic energy is applied to the first member 100. So in most cases,
The first member 100 has the stopper surface 104 thereof and the second member 1
02, the first member 1
The kinetic energy of 00 does not become 0, and the surplus is included. Based on this surplus of kinetic energy, when the press-fitting is completed, as shown in FIG. 9, the first member 100 to the second member 1
02, the surplus force F ₁ based on the surplus of the kinetic energy of the first member 100 acts, and further the repulsive force F ₂ from the second member 102 to the first member 100 according to the surplus force F _1. Will work. At this time, since the stopper surfaces 104 and 106 are perpendicular to the approaching direction (collision direction) of the two members 100 and 102, the rebounding force F ₂ has the same magnitude as the surplus force F ₁ . for that reason,
If the press-fitting condition varies and the surplus of the kinetic energy, that is, the surplus force F ₁ varies accordingly, the rebounding force F ₂ is generated in response to the variation. As a result, the distance by which the first member 100 bounces from the second member 102 varies in response to variations in the press-fitting conditions, and the press-fitting length L is not sufficiently stabilized.

The present invention has been made in view of the above circumstances, and its problem is that the press-fitting length of two members is sufficiently large in spite of variations in kinetic energy, variations in press-fitting margin, and variations in material hardness. It is to provide a stable press-fitting method.

[0008]

According to the present invention, a first member having a rod-shaped portion and a hole-shaped member are provided.
Kinetic energy is applied to at least one of the second member having the portion so as to approach each other, and the first member and the second member
With the same cross section of the rod-shaped part of the first member.
The straight extending portion is the same as the hole-shaped portion of the second member.
A press-fitting method of press-fitting into a straightly extending portion in a cross-section is such that, at the end of the press-fitting, the first member and the second member are made to collide with each other on a stopper surface inclined with respect to a plane perpendicular to their approaching direction. It is solved by a shall be defined press-fit length.

When the first member and the second member are caused to collide with each other at the stopper surface perpendicular to the approaching direction at the end of the press-fitting, the surplus force and the magnitude acting on the mating member from each member at the time of the collision are large. Equal bouncing force acts on each member from the mating member in the direction opposite to the approaching direction. On the other hand, when the first member and the second member are caused to collide with each other at the stopper surface inclined with respect to the plane perpendicular to the approaching direction at the time of completion of press-fitting, when each member collides with the other member at the time of collision. A rebounding force having a magnitude smaller than the surplus force acting on each member acts on each member in the direction opposite to the approaching direction. Therefore, in the case of the same magnitude of surplus force, in the latter case, the rebounding force that each member receives from the opponent member at the time of collision is lower than in the former case, and at the time of collision each member is separated from the opponent member by the surplus force. The bounce distance becomes shorter.

Based on the above findings, in the above-described press-fitting method, at the end of press-fitting, the first member and the second member are caused to collide with each other on the stopper surface inclined with respect to the plane perpendicular to the approaching direction thereof. To be

Therefore, according to this press-fitting method, the sensitivity of the magnitude of the rebounding force to variations in kinetic energy, variations in press-fitting margin, and variations in material hardness becomes insensitive, and despite the variations, the press-fitting length of the two members is reduced. It is possible to obtain the effect that the stability is sufficiently stabilized.

According to this press-fitting method , the first member is formed in a portion of the rod-shaped portion of the first member that extends straight in the same cross section .
The second member has the same cross-section of the hole-shaped portion of the hole-shaped portion thereof.
It is carried out by press-fitting in a straight extending portion . The first member can be a member that has a constant cross-sectional shape and extends straight, or a member that extends straight with a change in cross-sectional shape, such as a stepped rod. Further, the second member can be a member having a hole having a bottom portion or a member having a hole having no bottom portion. Further, in this press-fitting method, kinetic energy is applied only to the first member to make the first member.
The rod-shaped portion of the member is tightly fitted into the hole-shaped portion of the second member, or kinetic energy is applied only to the second member to close the hole-shaped portion of the second member to the rod-shaped portion of the first member. It can be implemented in the form of fitting. Further, this press-fitting method can also be carried out in a form in which kinetic energy is applied to both the first member and the second member so that the two members approach each other and collide with each other. Further, in this press-fitting method, the “stopper surface” can be formed by a flat surface or a curved surface. In addition, in this press-fitting method, the "stopper surface" is the first member and the second member.
It may be provided on at least one of the members, or may be provided on a member different from the two members and sandwiched between the two members.

In one mode of the above-described press-fitting method, the stopper surface has a peripheral edge of a tip end portion of a rod-shaped portion of the first member and a peripheral edge portion of a hole-shaped portion of the second member in a press-fitted state. It is provided on at least one of the contacting portions.
When the stopper surfaces are provided on both members, if the inclination angles of the stopper surfaces are made equal to each other so that the two members come into surface contact with each other at the time of collision, an excessively large surface will be provided on both members at the time of collision. No pressure is generated and no excessive deformation is generated.

In another form of the above press-fitting method, the second
The hole-shaped portion of the member is formed by forming a stepped hole in the second member in a state of a large diameter portion on the opening side and a small diameter portion on the bottom side, and the stopper surface is formed. A connecting portion for connecting the large diameter portion and the small diameter portion of the hole portion of the second member to each other, and the peripheral edge of the rod portion of the first member in a press-fit state. It is provided on at least one of the contacting portions. By the way, when press-fitting, a closed space may be formed between the tip of the rod-shaped portion of the first member and the bottom of the hole-shaped portion of the second member. In this case, the compressibility of air, that is, the value ΔV obtained by subtracting the volume V ₂ of the closed space existing at the end of the press-fitting from the volume V ₁ of the closed space existing at the start of the press-fitting is divided by the volume V _1. Is larger, it becomes more difficult to control the press-fit length with high accuracy. On the other hand, in this embodiment, the volume V ₁ at the start of press-fitting is increased by the space in the small-diameter portion, and the volume V ₂ at the end of press-fitting is also the space in the small-diameter portion, as compared with the configuration having no small-diameter portion. As a result, the compressibility of air is reduced, which makes it easier to compress air and facilitates accurate management of the press-fit length.

In still another mode of the above-described press-fitting method, a recess is provided at the tip of the rod-shaped portion of the first member at a position facing the second member, while the recess of the hole-shaped portion of the second member is provided. A convex portion that fits into the concave portion is provided at a position that fits into the concave portion in a press-fitted state, and the stopper surface is provided on at least one of the concave portion and the convex portion.

In still another mode of the above-described press-fitting method, the stepped portion is formed in the first member in a state where the tip portion has a small diameter portion and the portion rearward of the tip portion has a large diameter portion, and the small diameter portion is formed. The stopper surface functions as the rod-shaped portion, and the stopper surface is a connection portion that connects the small diameter portion and the large diameter portion of the first member to each other, and the opening portion of the hole-shaped portion of the second member. It is provided on at least one of the portion that comes into contact with the connection portion in the press-fitted state.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, some more specific embodiments of the present invention will be described in detail with reference to the drawings.

One embodiment of the press-fitting method according to the present invention is a method of press-fitting the first member into the second member by using the first member as the moving member and the second member as the stationary member. Specifically, FIG. As shown in FIG. 1, the first member 10 is accelerated to move the rod-shaped portion 11 of the first member 10 into the hole-shaped portion 16 of the second member 12.
It is a method of press-fitting by collision.

The first member 10 has a circular cross section and has a shape extending along one axis, and a rod-shaped portion 11 is provided at one end thereof.
Is provided. The tip end portion 18 of the rod-shaped portion 11 is chamfered (C chamfered or R chamfered) at its peripheral edge, whereby a tip end tapered surface 20 is formed at the peripheral edge. This tip tapered surface 20
Are inclined with respect to a plane perpendicular to the axis of the first member 10.

On the other hand, as shown in FIG. 3, the second member 12 has a generally cylindrical shape, and a hole-like portion 16 is formed as a stepped bottomed hole coaxially therewith.
As shown in FIG. 1, the hole-shaped portion 16 has a large diameter hole 22 formed on the opening side and a small diameter hole 24 formed on the bottom side. The large-diameter holes 2 of the hole-shaped portion 16
A connecting surface 30 that connects the peripheral surface of No. 2 and the peripheral surface of the small diameter hole 24 to each other is formed as a tapered surface. This connection surface 30
Are inclined with respect to a plane perpendicular to the axis of the second member 12. At the end portion 18 of the first member 10, the connection surface 30 comes into contact with the boundary line where the flat tip surface and the taper surface 20 contact each other at the tip end portion 18 of the first member 10, and functions as the "stopper surface" in the present invention. Therefore, the press-fit length L of the first member 10 and the second member 12 is regulated.

After the press-fitting, the rod-shaped portion 11 is tightly fitted into the large-diameter hole 22 so that the rod-shaped portion 1 is fitted before the press-fitting.
The outer diameter of 1 is larger than the inner diameter of the large diameter hole 22. In FIG. 1, the broken line shows the shape of the rod-shaped portion 11 before press fitting. The rod-shaped portion 11 is subjected to serration processing on its outer peripheral surface so that the outer peripheral surface of the rod-shaped portion 11 is relatively easily crushed during press fitting.

As described above, in this embodiment, the connecting surface 30 functions as a "stopper surface". Therefore, the kinetic energy of the first member 10 does not become 0 at the moment when the tip end portion 18 of the first member 10 comes into contact with the connection surface 30 at the end of press-fitting, and the first member 10 moves to the second member 1.
When 2 excess force F ₁ to act, as shown in FIG. 2, the excess force F ₁ is the force component F _1N in direction normal to the connection surface 30 to the connecting surface 30, a component force F _1T is in a tangential direction Acts as. The component force F _1N and the component force F _1T are F _1N = F ₁ · cos θ F _1T = F ₁ ·, where θ is the angle between the normal direction of the connecting surface 30 and the axial direction of the second member 12. It is expressed by each equation of sin θ.

By the way, since the coefficient of friction between the tip portion 18 of the first member 10 and the connecting surface 30 is generally much smaller than 1, it is neglected for convenience of explanation, and the surplus of the kinetic energy of the first member 10 is neglected. assuming the first member 10 will not be stored as the second member 12 and the strain energy, the component force F _1N and size equal reaction force F _R is applied from the connecting surface 30 to the first member 10 Therefore, only the component of the reaction force F _R in the axial direction of each member 10, 12 (equal to the approaching direction of the two members 10, 12) is repelled force F ₂
Will act as. After all, the rebounding force F ₂ is expressed by the formula F ₂ = F _R · cos θ = F _1N · cos θ = F ₁ · cos ² θ.

In this way, the first member 10 is connected to the connecting surface 30.
When the surplus force F ₁ acts on the first member 1, the rebounding force F ₂ is equal to the surplus force F ₁ from the connecting surface 30 to the first member 1.
Instead of acting on 0, the rebounding force F ₂ acts with a magnitude smaller than the surplus force F ₁ .

In the present embodiment, the inclination angles of the tip tapered surface 20 and the connecting surface 30 are not equal to each other, but they can be equal to each other.
Not only the connecting surface 30 but also the tapered end surface 20 can function as a “stopper surface”.
With this configuration, when the stopper surfaces collide with each other, excessive surface pressure does not occur on each stopper surface, and excessive deformation does not occur.

This press-fitting method is carried out by the press-fitting machine shown in FIG. This press-fitting machine includes a holding device 40 that holds the second member 12 in a horizontal posture. The holding device 40 is
It has a housing 42 and an air chamber 46 formed in the housing 42, and holds the second member 12 in the air chamber 46. The air chamber 46 is always communicated with the atmosphere through the through hole 47. The housing 42 is formed with a through hole 48 that communicates with the air chamber 46 at one end and communicates with the atmosphere at the other end. The through hole 48 is closed by detachably attaching the cap 50 to the housing 42 with the bolt 52 or the like. The cap 50 has a second member 12 on the air chamber 46 side.
Fitting holes 53 are formed at both ends (rear side) opposite to the end that collides with the first member 10 of both ends.

The press-fitting machine further comprises a guide passage 54 for guiding the first member 10 in a substantially airtight and slidable manner. The guide passage 54 is formed by the internal passage 55 of the housing 42 and the internal passage of the pipe 56 serving as a passage forming member.
It is formed coaxially with the second member 12 of the holding device 40. The guide passage 54 has an air chamber 46 at one end thereof.
It is connected to the. The first member 10 is fitted in the guide passage 54 in its rod-shaped portion 14 in a substantially airtight and slidable manner.

The press-fitting machine further includes an accelerating device 58 for accelerating the first member 10. The accelerating device 58 includes a high-pressure device 60 that makes the rear pressure of the first member 10 higher than atmospheric pressure.
Is equipped with. The high-pressure device 60 includes (a) housing 62
And (b) a high pressure source 64 that holds the high pressure air and supplies it as necessary, and (c) an air chamber 66 formed in the housing 62.
It has and. The high pressure source 64 is configured to include, for example, a compressor and a control valve. The air chamber 66 is the air passage 6
It is connected to the high voltage source 64 by 8 and is also connected to the other end of the guide passage 54.

Next, the contents of this press-fitting method will be described in time series. Prior to press-fitting the two members 10 and 12, each member 10,
12 is set in the press-fitting machine at a predetermined position. In this state, if the high pressure air is supplied from the high pressure source 64 to the air chamber 66 through the air passage 68, the high pressure air is supplied to the space in the guide passage 54. When the high-pressure air is supplied to the space inside the guide passage 54, the rear pressure of the first member 10 becomes higher than the atmospheric pressure. Then, the first member 10 is accelerated in the direction parallel to the axis of the first member 10 by increasing the rearward pressure, whereby the kinetic energy is applied to the first member 10. As a result, the first member 10 approaches the second member 12 coaxially, and eventually the first member 10 moves toward the second member 12.
And the two members 10, 12 are pressed into each other. After the press-fitting is completed, the cap 50 is attached to the housing 4
The two members 10 and 12 as the press-fitting assembly are taken out from the holding device 40 by removing from the holding device 40.

Accelerator 58 is designed to impart a kinetic energy to first member 10 that is greater than the standard kinetic energy. Regarding the standard kinetic energy, the press-fitting margin S of the first member 10 and the second member 12 is normal, and those 2
In a situation where the material hardness of the members 10 and 12 is also normal, the size is defined as the size at which the kinetic energy of the first member 10 becomes 0 at the moment when the tip end portion 18 of the first member 10 contacts the connecting surface 30 of the second member 12. Has been done. The magnitude of the kinetic energy applied to the first member 10 by the acceleration device 58 is acquired by an experiment or the like, and the magnitude can be, for example, about 1.5 times the standard kinetic energy. As described above, in the present embodiment, due to variations in kinetic energy, press-fitting margin S, and material hardness, the first member 10 may reach the connecting surface 30 of the second member 12 before the tip portion 18 of the first member 10 reaches the connecting surface 30. It is prevented that 10 stops. Despite variations in kinetic energy, press-fitting margin S, and material hardness, the tip end portion 18 of the first member 10 reliably collides with the connecting surface 30 of the second member 12.

As a result, the first member 10 is replaced by the second member 12
Although the surplus force F ₁ is applied to the second member 12 at the time of collision with the second member 12, since the two members 10 and 12 collide with each other at the connecting surface 30 which is a slope as described above, the second member 12 Therefore, the rebounding force F ₂ acts on the first member 10 with a magnitude smaller than the surplus force F ₁ . Therefore, even if the bounce force F ₂ acts, the first member 10 does not bounce from the second member 12 at all, or even if it bounces, the distance can be suppressed to be small.

As is clear from the above description, according to the present embodiment, it is possible to prevent variations in the kinetic energy applied to at least one of the two members, variations in the press-fitting margin S of the two members, and variations in the material hardness of the two members. Bounce power F ₂
The sensitivity of the size becomes insensitive, and the press-fit length L of the two members is sufficiently stabilized despite the variation. Based on this effect, it is possible to obtain an effect that it is not essential to strictly control variations in kinetic energy, press-fitting margin S and material hardness in order to accurately control the press-fitting length L of the two members.

Further, in the present embodiment, the closed space formed between the two members 10 and 12 does not disappear at the end of the press-fitting at the start of the press-fitting, but the space inside the small-diameter hole 24 is even before the start of the press-fitting. It exists even after the press fitting is completed. Therefore, in the present embodiment, as compared with the case where the small-diameter hole 24 is not provided, the ratio in which the air has to be compressed for press-fitting can be small, and the air can be easily compressed, and the press-fitting length L It is also possible to obtain the effect of facilitating accurate management.

Another embodiment will be described. However, since the present embodiment has many elements in common with the previous embodiment, the same reference numerals are used for the common elements to omit the description with the text and figures, and only the different elements will be described in detail.

In the previous embodiment, the connection surface 30 provided on the second member 12 functions as a stopper surface, but in the present embodiment, as shown in FIG. 4, the connection surface 80 is formed. Is a flat surface perpendicular to the axis of the second member 12, and at the end of press fitting, the tip tapered surface 20 collides with a boundary line 82 where the connecting surface 80 and the peripheral surface of the small diameter hole 24 are in contact with each other. To do. That is, in the present embodiment, the tip end tapered surface 2 provided on the first member 10 is used.
0 functions as a "stopper surface". Therefore, in the present embodiment, as shown in FIG. 5, the first member 10 is caused to collide with the second member 12 on the tapered surface 20 of the tip portion, and for the reason according to the reason in the previous embodiment, The rebounding force F ₂ is generated with a magnitude smaller than the surplus force F ₁ .

Another embodiment will be described. However,
The same reference numerals are used for the elements common to the above-described two embodiments, and the detailed description thereof will be omitted. Only different elements will be described in detail.

As shown in FIG. 6, in the present embodiment, a recess 100 is formed in the center of the tip surface of the tip portion 18 of the rod portion 11. The peripheral edge of the opening of the recess 100 is chamfered, whereby a recessed tapered surface 102 is formed on the peripheral edge. The concave tapered surface 102 is
It is inclined with respect to a plane perpendicular to the axis of the first member 10.

In both of the previous two embodiments, the hole-shaped portion 16 is formed as a stepped hole, but in the present embodiment, it is formed as a bottomed cylindrical hole that extends straight in the same cross section. A convex portion 104 that projects in a circular cross section toward the opening of the cylindrical hole is provided at the bottom of the convex portion 104. The peripheral edge of the tip of the convex portion 104 is chamfered, so that the convex tapered surface 106 is formed on the peripheral edge. The convex taper surface 106 is provided on the second member 1.
It is tilted with respect to a plane perpendicular to the two axes. Further, the convex tapered surface 106 is formed so as to be parallel to the concave tapered surface 102 in the press-fitted state, and therefore, comes into surface contact with the concave tapered surface 102 when the press-fitting of the two members 10 and 12 is completed.

In this embodiment, at the end of press fitting, 2
In the case where the members 10 and 12 collide with each other on the concave tapered surface 102 and the convex tapered surface 106 that respectively function as “stopper surfaces”, and thus the surplus force F ₁ acts on the second member 12 from the first member 10. , The rebounding force F ₂ is smaller than the surplus force F ₁ from the second member 12 to the first member 1.
Acts on zero.

Still another embodiment will be described. However,
The same reference numerals are used for the elements common to the first and second embodiments, and the detailed description will be omitted. Only the different elements will be described in detail.

As shown in FIG. 7, in this embodiment, the rod-shaped portion 11 is stepped, and the small diameter portion 1 is provided at the tip.
20, a large-diameter portion 122 is formed in a portion rearward from the tip end portion thereof, and a connecting surface 124 connecting the peripheral surfaces of the small-diameter portion 120 and the large-diameter portion 112 to each other is tapered. There is. The connection surface 124 is the first member 10
It is inclined with respect to a plane perpendicular to the axis of.

In both of the first two embodiments, the hole-like portion 16 is formed as a stepped hole, but in this embodiment, it is formed as a bottomed cylindrical hole that extends straight in the same cross section. The peripheral edge of the opening of the cylindrical hole is chamfered, whereby a cylindrical hole tapered surface 126 is formed on the peripheral edge. This cylindrical hole tapered surface 126
Are inclined with respect to a plane perpendicular to the axis of the second member 12. Also, this cylindrical hole tapered surface 126
Are formed so as to be parallel to the connection surface 124 in the press-fitted state, so that they make surface contact with the connection surface 124 when the press-fitting of the two members 10 and 12 is completed.

In the present embodiment, at the end of press fitting, 2
When the members 10 and 12 collide with each other at the connection surface 124 and the cylindrical hole taper surface 126, each of which functions as a “stopper surface”, and thus the surplus force F ₁ acts on the second member 12 from the first member 10, A rebounding force F ₂ acts on the first member 10 from the second member 12 with a magnitude smaller than the surplus force F ₁ .

Although some embodiments of the present invention have been described in detail above with reference to the drawings, other than those, various modifications based on the knowledge of those skilled in the art without departing from the scope of the claims. It goes without saying that the present invention can be implemented in an improved form.

[Brief description of drawings]

FIG. 1 is a side sectional view showing how a press-fitting method according to an embodiment of the present invention is carried out.

FIG. 2 is a side cross-sectional view showing an enlarged main part in FIG.

FIG. 3 is a plan sectional view showing a press-fitting machine suitable for carrying out the embodiment.

FIG. 4 is a side sectional view showing how a press-fitting method according to another embodiment of the present invention is carried out.

5 is a side cross-sectional view showing an enlarged main part in FIG.

FIG. 6 is a side sectional view showing how a press-fitting method according to still another embodiment of the present invention is carried out.

FIG. 7 is a side sectional view showing how a press-fitting method according to still another embodiment of the present invention is carried out.

FIG. 8 is a side sectional view showing how the press-fitting method proposed by the present inventor prior to the present invention is carried out.

9 is a side cross-sectional view showing an enlarged main part in FIG.

[Explanation of symbols]

10 First member 11 bar 12 Second member 16 holes 20 Tapered surface at the tip 30,80,124 Connection surface 102 tapered surface of recess 106 Convex taper surface 126 Cylindrical hole tapered surface

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-62-162476 (JP, A) JP-A-9-66421 (JP, A) JP-A-8-294879 (JP, A) JP-A-6- 312322 (JP, A) JP-A-9-239467 (JP, A) JP-A-5-256309 (JP, A) JP-A-60-50204 (JP, A) Actually developed 61-44006 (JP, U) Actual Development Sho 63-6271 (JP, U) Special Public Official Sho 50-50325 (JP, B2) Actual Public Hei 5-42249 (JP, Y2) Actual Public Sho 55-49138 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23P 19/00-21/00 F16B 4/00

Claims (3)

(57) [Claims] 1. A first member having a rod-shaped portion and a hole- shaped portion
Collision first member and to impart kinetic energy in a direction toward each other in at least one of the second member and the second member
And straighten the rod-shaped portion of the first member with the same cross section.
Make sure that the extending portion is the same as the hole of the second member in the same cross section.
Tsu a press-fit method of injecting the immediately extending portions, and at the end of the press-fitting, to collide with each other at a stopper surface inclined relative to a plane perpendicular to the first member and the second member relative to their approach direction press-fitting method characterized that you define a press-fit length. Wherein said stopper surface is the a peripheral edge of the distal end of the rod-shaped part, of the hole-shaped portion, claim wherein the periphery by pressed-in condition is provided on at least one of the portion contacting 1
Press-fitting method described in. 3. The hole-shaped portion is formed by forming a stepped hole in the second member in a state of a large diameter portion on the opening side and a small diameter portion on the bottom side, At least one of the stopper surface is a peripheral edge of the tip end portion of the rod-shaped portion and a connection portion that connects the large diameter portion and the small diameter portion of the hole-shaped portion to each other and the peripheral edge contacts in a press-fitted state. The press-fitting method according to claim 1 , wherein the press-fitting method is provided in.