JP3310599B2 - Metallic color and fastening structure using the same color - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent deformation and damage by being mounted in a fastening hole made of a material such as a resin component which is fastened to an object to be mounted by fastening means such as bolts. And a fastening structure using the metal collar.

[0002]

2. Description of the Related Art When a resin component such as a resin intake manifold is fastened to an object to be mounted such as a cylinder head by fastening means such as bolts, the resin component is deformed or cracked by the axial force of the fastening means. May cause damage. One of the methods for preventing the deformation or damage of the material such as a resin component is to attach a metal collar to a through hole that is a fastening portion of the same material and fasten the material to an object to be mounted via the metal collar. There is a way.

Hereinafter, a general metal collar and a fastening structure using the same metal collar will be described with reference to FIGS. FIG. 7 is a sectional view showing a state in which the resin component is fastened to an object to be mounted, and FIG. 8 is a schematic sectional view showing a dimensional relationship between the resin component and a metal collar.

[0004] As shown in FIG. 7, a cylindrical metal collar 53 is press-fitted into a through hole 52 provided in a resin component 51. The resin component 51 is disposed such that the through hole 52, more precisely, the cylindrical portion 53 a of the metal collar 53 corresponds to the female screw hole 55 of the mounted object 54 with respect to the mounted object 54. And bolt 56 is washer 57
And is screwed into the female screw hole 55 via the metal collar 53.

As shown in FIG. 8, the diameter φd ′ of the through hole 52 of the resin part 51 and the metal collar 53
The dimensional error with respect to the outer diameter φd is improved to about ± 0.02 mm. This is because when the metal collar 53 is pressed into the through hole 52 of the resin component 51, the metal collar 53 is prevented from falling out of the through hole 52, and the through hole is pressed by the metal collar 53. 52
This is to prevent the surrounding area from being damaged.

On the other hand, the length L2 of the metal collar 53 is
The length is set shorter than the thickness L1 of the resin component 51 by the length C. Therefore, when the metal collar 53 is pressed into the through hole 52 of the resin component 51, the resin component 51
A clearance corresponding to the length C is generated between the metal collar 53 and the metal collar 53. This clearance C is secured as a crushing allowance by the bolt 56. When the resin component 51 and the object 54 are fastened by the bolt 56, the bolt 56 is elastically deformed by the axial force of the resin component 51 by an amount corresponding to the above-mentioned crushing amount. Are flush with the upper surface of the metal collar 53. At this time, the bolt 56 receives an urging force corresponding to the elastic deformation from the resin component 51. The bolt 56 is prevented from being loosened by the urging force.

When the bolt 56 is fastened, if the load sharing ratio between the resin component 51 and the metal collar 53 due to the axial force of the bolt 56 is biased toward one of the two,
A member having a high load sharing ratio may increase strain due to a change with time, that is, may cause creep. In particular, if this load sharing ratio is biased toward the resin component 51,
There is a possibility that the crushing allowance for the clearance C is not elastically deformed but plastically deformed. Therefore, the load sharing ratio between the resin component 51 and the metal collar 53 needs to be substantially equal. For this purpose, the clearance C may be set so that the urging force is about half the axial force of the bolt 56. The allowable setting amount of the clearance C is in a range of about 0.05 to 0.31 mm as shown in FIG. Therefore, the length L2 of the metal collar 53 with respect to the thickness L1 of the resin component 51 also needs to be set with high accuracy.

As a result, according to the metal collar and the fastening structure using the metal collar, the resin component 51
Φd 'and wall thickness L1 and outer diameter φd of metal collar 53
Very high precision is required for the relative dimensions with respect to the length L2. In addition, since the resin component 51 usually has variations due to shrinkage of the resin molding die, the flow direction of the fiber auxiliary material, and the mold release gradient, etc., it is difficult to achieve high precision. The processing accuracy is particularly severe. Therefore, the productivity of the metal collar 53, which requires delicate machining such as cutting, is inevitably reduced.

To cope with such inconveniences, Japanese Patent Laid-Open Publication No. Hei 6-167258 and Japanese Utility Model Laid-Open Publication No.
Japanese Patent No. 6757 discloses a collar (bush) and a fastening structure using the collar.

[0010] In particular, in the metal collar described in JP-A-6-167258, a collar is provided on the collar, and the collar is pressed into a through hole of a resin material via an elastic body.
The precision in the length direction of the collar is reduced.
That is, since the axial force is applied to the bolt by the elastic body, the clearance C as the above-mentioned crushing margin is not required.

Japanese Patent Application Laid-Open No. 6-167258 describes a metal collar having a slit in the axial direction on the peripheral wall of the collar portion, and a metal collar having a projection provided on the peripheral wall in addition to the metal collar. The metal collar is pressed into the through-hole of the resin material to prevent the collar from dropping out of the through-hole. According to such a structure of the metal collar, the dimensional accuracy between the inner diameter of the through hole of the resin material and the outer diameter of the metal collar is relaxed.

[0012]

However, in such a conventional metal collar and a fastening structure using the same, the above-mentioned elastic body must be prepared as a separate member. In addition to inconvenience, slits and projections must be provided in the metal collar, which reduces productivity. Further, when the metal collar is pressed into the through hole of the resin material, the metal must be elastically deformed with respect to the resin, so that the resin material around the through hole may be deformed or cracked. .

The present invention has been made in view of the above circumstances, and has as its object to increase the number of parts without increasing the number of parts and to reduce the accuracy while improving productivity. An object of the present invention is to provide a metal collar and a fastening structure using the metal collar, which enable highly reliable fastening of an attachment such as a resin material.

[0014]

In order to achieve the above object, according to the first aspect of the present invention, a counterbore is provided on an upper portion.
In the structure in which the attachment having the provided fastening hole is fastened and fixed to the attachment by fastening means such as bolts, the metal collar is mounted in the fastening hole of the attachment, and the entire length of the collar is the metal collar. The seat is formed longer than the hole length of the fastening hole.
The part corresponding to the bore is the same based on the pressure from the length direction.
The gist is that it is plastically deformed in the spot facing .

According to the same structure as the metal collar, the entire length of the collar is automatically adjusted to a length corresponding to the length of the fastening hole according to the degree of the plastic deformation. For this reason,
At least the accuracy of the length of the collar is reduced, and the productivity is improved accordingly.

According to the second aspect of the present invention, the first aspect of the present invention is provided.
The metal collar is plastically deformed in the counterbore.
The thickness of one part is thinner than the thickness of the other part.
Is the gist of that.

In this way, the metal color must be used.
Assigns necessary strength and reaction force (spring force) to bolt
It can be adjusted at will.

According to the third aspect of the present invention, the first aspect or the
3. The metal collar according to 2, wherein the metal collar contacts the object.
Part having a flange at the part and corresponding to the counterbore
The gist of the invention is that it is plastically deformed so that it is not fallen into the fastening hole of the attachment.

According to the same structure as the metal collar, the entire length of the collar is automatically adjusted to a length corresponding to the length of the fastening hole according to the degree of plastic deformation, and the protrusion of the peripheral wall due to the plastic deformation, In addition, the metal collar sandwiches the fastening hole by the lower flange thereof, so that the metal collar does not fall from the fastening hole. For this reason, both the accuracy regarding the length of the collar and the accuracy regarding the outer diameter are relaxed, and the productivity is improved accordingly. In addition, the provision of the flange prevents the metal collar from damaging the surface of the object.

According to a fourth aspect of the present invention, there is provided a fastening structure using a metal collar in which an attachment having a metal collar mounted in a fastening hole is fastened and fixed to the workpiece by fastening means such as bolts. A counterbore is provided at the upper part of the fastening hole of the attachment, and the metal collar having the entire length of the collar longer than the hole length of the fastening hole is compressed and deformed in the counterbore to be opposed to the fastening means. According to the same configuration as a fastening structure using a metal collar, the gist of which is to apply a force, according to the degree of compression deformation of the metal collar, the entire length of the collar is equal to the length of the fastening hole in the attachment. The length is automatically adjusted to a suitable length, and loosening of the fastening means can be suitably prevented through the reaction force of the spring back to the fastening means. For this reason, the precision with respect to the length of the metal collar is relaxed, the productivity is improved, and more reliable fastening without loosening of the fastening means is realized. In addition, there is no increase in the number of parts at the time of the fastening.

According to a fifth aspect of the invention, in the fastening structure using the metal collar according to the fourth aspect, the gist of the invention is that the metal collar has a flange at a contact portion with the attachment. .

According to the same structure as the fastening structure using the metal collar, the contact area between the metal collar and the object is increased through the flange, and the object is made of a relatively soft material such as aluminum. The surface, if any, is not damaged by the metal collar.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing a state in which a resin component having a metal collar mounted thereon is fastened to an object as a fastening structure using a metal collar according to the present embodiment, and FIG. FIG. 2 is a perspective view of a metal collar to be provided. When the resin component as the attachment is a resin intake manifold, the attachment is, for example, a cylinder head made of aluminum or the like.

As shown in FIG. 1, a through-hole 12 is provided in the resin component 11. A counterbore 13 is provided at an upper edge of the through hole 12, and a concave portion 14 corresponding to a flange 16 of a metal collar 15 described later is provided at a lower edge of the through hole 12. As shown in FIG. 2, the metal collar 15 made of mild steel such as SCP270 or SUS has a cylindrical portion 15a formed in a cylindrical shape, and has a base end (lower part in the figure).
Is formed with a flange portion 16. Further, the entire length of the metal collar 15 is formed, for example, about 3 to 5 mm longer than the length of the through hole 12.

The metal collar 15 thus formed is
After being inserted into the through hole 12 from the tip portion 17,
As will be described later, the tip portion 17 is plastically deformed in the counterbore portion 13 into a substantially rectangular shape in cross section by being pressed from the length direction by a press or the like. The resin component 11 to which the metal collar 15 has been attached is attached by the bolt 23 and the washer 24 in a state where the cylindrical portion 15a of the metal collar 15 is arranged so as to correspond to the female screw hole 22 of the attachment 21. 21.

Next, the process of assembling the thus constituted fastening structure will be described in more detail with reference to FIG. 1 and FIGS.
3 to 5 are cross-sectional views sequentially showing an assembling mode of the fastening structure using the metal collar according to the present embodiment.

When assembling the structure, first, FIG.
The metal collar 15 is inserted into the through hole 12 of the resin component 11 in the mode shown in FIG. At this time, the same metal collar 15 inserted from below the resin component 11 has its flange portion 16 provided in the concave portion 1 provided below the through hole 12.
4 and the lower surface of the metal collar 15 is flush with the lower surface of the resin component 11 as shown in FIG. The outer diameter of the metal collar 15 is 0.05 to 0.45 with respect to the inner diameter of the through hole 12 (molding accuracy ± 0.1 mm).
It is dimensioned to have a gap of about mm. In this state, the tip 17 of the collar 15 protrudes from the upper surface of the resin component 11 by a predetermined amount h (3 to 5 mm).

Subsequently, as shown in FIG. 3B, the metal collar 15 is pressed from above by a press 31. At this time, since the distal end portion 17 of the collar 15 protrudes from the resin component 11 by a predetermined amount h, the pressing force of the press machine 31 causes the distal end portion 17 to move in the manner shown in FIG. Plastic deformation due to buckling occurs in the counterbore portion 13 and, as described above, it bends in a substantially “C” -shaped cross section. At this time, the press machine 31 moves to a position where the lower surface of the press machine 31 is flush with the upper surface of the resin component 11, and then the metal collar 15 is moved by the press machine 31 as shown in FIG. When the tip 17 is released from the pressing,
Is the resin part 1 by elastic return (spring back)
1 protrudes from the upper surface by a length S. That is, the distal end portion 17 of the metal collar 15 can be elastically deformed by the protruding length S. In addition, even if the above-mentioned gap exists between the outer diameter and the inner diameter of the through-hole 12 by the plastic deformation of the tip portion 17 of the metal collar 15 in this manner,
The collar 15 will not drop from the through hole 12. That is, even when the resin component 11 is transported in the same state, it is possible to prevent the metal collar 15 from being dropped or lost from the component 11 beforehand.

Next, as shown in FIG. 5, the resin component 11 on which the metal collar 15 has been attached is
The female screw hole 22 of the metal collar 15 and the cylindrical portion 15a of the metal collar 15 correspond to each other and are superimposed on the attachment 21. Then, the bolt 23 is inserted into the cylindrical portion 15a via the washer 24 in the manner shown in FIG. 5 and screwed into the female screw hole 22 of the attachment 21 with a predetermined tightening torque using a torque wrench or the like. Thus, the assembly of the fastening structure shown in FIG. 1 is completed.

By the way, when the bolt 23 is screwed, the distal end 1 of the metal collar 15 is attached to the bolt 23.
7 generates a reaction force based on the elastic deformation (spring force).
This reaction force prevents the fastening force from being loosened by the bolt 23 and also reduces the concentration of the fastening load applied only to the resin component 11. On the other hand, the reaction force based on the spring force is determined by the material, length, thickness, and the like of the metal collar 15. Therefore, in the present embodiment, the length and thickness of the metal collar 15, including the material thereof, are set so that the axial force of the bolt 23 is applied to the resin component 11 and the metal collar 15 approximately half each. Like that.

The operation and effect of the embodiment described above will be summarized below. The relative accuracy between the diameter of the through hole 12 of the resin component 11 and the outer diameter of the metal collar 15 and the relative accuracy between the thickness of the resin component 11 (hole length of the through hole 12) and the entire length of the collar 15 are reduced. Can be done. That is, when forming the metal collar 15, delicate machining such as cutting is not required.
Therefore, the productivity of the metal collar 15 can be improved. Moreover, according to the fastening structure of the present embodiment, there is no need to prepare a separate member for applying a reaction force to the bolt 23, so that it is possible to prevent an increase in the number of parts, and Management costs and manufacturing costs can be reduced.

The through-hole (fastening hole) 12 of the metal collar 15
After the insertion, the tip portion 17 is plastically deformed by the press, so that the collar 15 can be prevented from falling out of the through hole 12. In addition, transportation of the resin component 11 in the same state becomes easy.

The deformed tip 17 of the metal collar 15
Since the reaction force based on the elastic deformation (spring force) of the length S is applied to the bolt 23, the bolt 23 can be reliably prevented from loosening after the screwing is completed.

The load sharing ratio between the resin component 11 and the metal collar 15 is determined by the ratio between the axial force of the bolt 23 and the reaction force. Since this reaction force can be adjusted by the (projection) length and wall thickness of the metal collar 15, the load sharing ratio can be easily adjusted. By making the load sharing ratios of the resin component 11 and the metal collar 15 approximately the same, various problems such as deformation or cracking of the resin component 11 due to the deviation of the load sharing ratio, reduction of the fastening force, and the like can be avoided. It can be solved suitably.

A flange 1 at the base end of the metal collar 15
By forming 6, a large contact area with the upper surface of the attachment 21 can be secured. That is, when the bolt 23 is screwed, the surface pressure received from the metal collar 15 pressed by the axial force of the bolt 23 on the contact surface of the object 21 can be reduced. Therefore, even if the attachment 21 is a relatively soft material such as aluminum,
There is no possibility that the metal collar 15 is deformed or damaged, for example, when the metal collar 15 gets into the contact surface of the attachment 21.

The above embodiment may be modified as described below, and the same operation and effect can be obtained in such a case. In the above embodiment, the metal collar 15 shown in FIG. 2 is used, but this is changed to a metal collar 41 shown in FIG.
As shown in the figure, the metal collar 41 also has a cylindrical portion 41a, a flange portion 42, and a distal end portion 43 similarly to the metal collar 15, but the thickness of the distal end portion 43 is larger than the thickness of the cylindrical portion 41a. It is formed thin. This makes it possible to arbitrarily adjust the required strength of the metal collar 41 and the reaction force (spring force) on the bolt 23.

The above metal color 1 is used as the metal color.
A slightly elliptic cylinder of 5, 41 is used. With this configuration, the metal collar pressed into the through-hole 12 of the resin component 11 attempts to return to an ellipse in the through-hole 12, so that the metal collar is located between the peripheral wall of the collar and the inner surface of the through-hole 12. Friction occurs. As a result, it is possible to prevent the collar from dropping out of the through hole 12 after the metal collar is mounted in the through hole 12.

The distal end of the collar can be bent by the axial force when the bolt 23 is fastened without being bent by the press machine 31. Thus, by making the metal collar into an elliptical cylinder, It is also possible to omit the pressing step by the press machine 31.

The flange portions 16 and 42 of the metal collars 15 and 41 are provided with tapered surfaces that converge in the insertion direction. At the same time, the concave portion 14 of the resin component 11 is formed in a shape corresponding to the tapered surface. If you do this,
The metal collar 15 is inserted into the through hole 12 of the resin component 11.
When inserting 41, the flange portions 16 and 42 can be easily accommodated in the concave portion 14 without being affected by an error between the inner diameter of the resin component 11 and the outer diameter of the metal collars 15 and 41. .

[0040]

According to the first aspect of the present invention, the insertion end of the metal collar protruding the predetermined amount is buckled and deformed, so that the metal collar can be prevented from falling out of the hole. Therefore, the relative accuracy in the radial direction between the attachment and the metal collar can be reduced.
At the same time, an urging force is applied to the fastening member by the elastic return force (spring-back force) of the insertion end of the buckled metal collar, so that the fastening member can be prevented from loosening. That is, the relative accuracy in the length direction between the attachment and the metal collar can be reduced. In addition, since the urging force is applied to the fastening member by the insertion end of the metal collar, it is not necessary to prepare a separate member for applying the urging force.

According to the third aspect of the present invention, the contact area between the metal collar and the object can be increased by the flange portion. Therefore, it is possible to reliably prevent the metal collar from being inserted into the contact surface of the mounted object and deforming the mounted object due to the axial force of the fastening member.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a fastening structure using a metal collar of the present invention.

FIG. 2 is a perspective view showing one embodiment of a metal collar of the present invention.

FIG. 3 is an exemplary sectional view showing the process of assembling the fastening structure according to the embodiment;

FIG. 4 is an exemplary sectional view showing the process of assembling the fastening structure according to the embodiment;

FIG. 5 is an exemplary sectional view showing a step of assembling the fastening structure according to the embodiment;

FIG. 6 is a perspective view showing another embodiment of the metal collar of the present invention.

FIG. 7 is a sectional view showing a general configuration of a fastening structure using a metal collar.

FIG. 8 is a sectional view showing a dimensional relationship between a resin part and a metal collar of the same structure.

FIG. 9 is a graph showing a relationship between a crushing allowance of a resin part of the same structure and a load sharing ratio.

[Explanation of symbols]

11: resin parts (attachment), 12: through-hole (fastening hole),
13: Counterbore, 14: Recess, 15, 41: Metal collar, 16, 42: Flange, 17, 43: Tip, 2
1: mounting object, 23: bolt (fastening means).

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Makoto Ito 3-6-6 Masaki, Naka-ku, Nagoya-shi, Aichi Takagi Seisakusho Co., Ltd. (56) References JP-A-9-166123 (JP, A) Showa 55-65706 (JP, A) Actually open Showa 53-106553 (JP, U) Actually open Showa 58-7906 (JP, U) Actually open Showa 50-131462 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F16B 43/00 F16B 39/284 F16B 39/34

Claims (5)

(57) [Claims] 1. It has a fastening hole provided with a counterbore at the top.
That fitment is by a fastening means such as bolts In the structure that is fastened to the attached object to a metal collar that is mounted in a fastening bore of the fittings, holes length of the collar total length the fastening holes Formed longer,
A metal collar, wherein a portion corresponding to the counterbore is plastically deformed in the counterbore based on pressurization in a length direction. 2. The metal collar according to claim 1, wherein a thickness of a portion of the collar which is plastically deformed in the counterbore is another portion.
A metal collar characterized by being formed thinner than the thickness of the metal. 3. The metal collar according to claim 1 or 2,
A flange at a contact portion with the object to be mounted;
A metal collar , wherein a part corresponding to the counterbore is plastically deformed so that the metal collar is not fallen into the fastening hole of the attachment. 4. A fastening structure using a metal collar in which an attachment in which a metal collar is mounted in a fastening hole is fastened and fixed to an object to be mounted by fastening means such as bolts. A counterbore is provided on the metal collar, and the metal collar having a total length longer than the length of the fastening hole is compressed and deformed in the counterbore to apply a reaction force to the fastening means. A fastening structure using a metal collar. 5. The fastening structure using a metal collar according to claim 4, wherein the metal collar has a flange at a contact portion with the attachment. .