JP2007315437A - Fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening device for fastening an FRP member and a member to be fastened with which creep of the FRP member can be suppressed and sufficient stiffness is gained at the fastening part. <P>SOLUTION: The first and the second collars 21, 22 are fastened to an FRP member 1, with a cylinder part 21a of the first collar 21 inserted to a fixing hole 3 formed in the FRP member 1, with a cylinder part 22a of the second collar 22 screwed to a cylinder part of the first collar, and with a flange part 21b of the first collar and a flange part 22b of the second collar grasping the circumferential part of the fixing hole of the FRP member 1. A screw means 30 is fastened to a female thread 25 in a cylinder part of the second collar, with a member to be fastened 2 grasped between the flange part nearer to a head part 30b of the screw means 30 and the head part 30b of the screw means. With this configuration, there is no fear of drop of an axial force by creep because the axial force of the bolt is completed at the first and the second collars 21, 22 made of metal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fastening device for fastening an FRP (fiber reinforced resin) member and a fastened member (a fastened member is a metal member but may be an FRP member) (the fastening device may be called a fastening structure). About.

  When the FRP member and the member to be fastened are fastened with bolts and nuts, the bolt is tightened with a high bolt axial force to prevent loosening of the bolt. Omission occurs, bolt looseness and backlash between members occur.

In order to prevent this, Patent Document 1 discloses that a conical seat portion having a predetermined axial length is provided on a nut, and the conical seat portion is pressed against a step portion of a stepped hole formed in a resin product. Resin that suppresses a reduction in axial force (fastening force) due to thermal creep of the resin product in the fastening part by compressing the step part of the resin product elastically with a conical seat part by a predetermined amount. The product fastening structure is disclosed.
JP 2001-159405 A

However, the fastening structure of the resin product of Patent Document 1 has the following problems.
Since the step portion of the resin product is directly tightened by the conical seat portion of the nut, the bolt axial force is applied to the step portion of the resin product, and the creep of the step portion of the resin product cannot be eliminated. In addition, since there is dimensional variation in the thickness direction of the step of the resin product, if the tightening allowance is increased so that the play does not occur, the creep of the step of the resin product and the resulting load drop will increase accordingly, and the fastening We cannot hold power enough. If the tightening margin is reduced, the pressing force becomes small, and there is a risk that loosening may occur.

  In addition, a gap exists between the nut product step-facing surface and the product step portion at a portion other than the contact portion between the conical seat and the resin product step, and the nut product step portion is opposed to the nut. Since the surface is in close contact with the product step on the entire surface facing the product step and does not press the product step, the resin product and the fastened member are relatively tilted when a moment is applied to the fastening part. The fastening portion cannot be expected to have a strong fastening and sufficient rigidity.

An object of the present invention is a fastening device for fastening an FRP member and a member to be fastened,
(A) It is possible to suppress creep of the FRP member, and
(B) A strong fastening at the fastening site is obtained,
The object is to provide a fastening device (fastening structure).

The fastening device of the present invention that solves the above problems is a fastening device that fastens an FRP member and a fastened member, and has a cylindrical portion and a flange portion, and has a female screw formed on the inner peripheral surface of the cylindrical portion. A first collar made of steel, a male thread that has a cylindrical part and a flange part, and is formed on the outer peripheral surface of the cylindrical part and is screwed into the female thread of the cylindrical part of the first collar. A second collar made of metal on which a screw is formed, and screw means with a head (for example, a bolt) having a head and screwed into the female screw of the cylindrical portion of the second collar. ing.
The first collar tube portion is inserted into the mounting hole formed in the FRP member, the second collar tube portion is screwed into the first collar tube portion, and the flange portion and the second collar portion of the first collar are screwed together. The first and second collars are attached to the FRP member with the flange portion of the collar sandwiching the peripheral part of the attachment hole of the FRP member.
In addition, the screw means is the first collar flange and the second collar flange, with the fastened member sandwiched between the flange near the head of the screw means and the head of the screw means. It is fastened to the female screw of the cylindrical portion of the second collar.

  According to the fastening device of the present invention, the first collar tube portion is inserted into the mounting hole formed in the FRP member, and the second collar tube portion is screwed into the first collar tube portion, The first and second collars are attached to the FRP member with the flange portion of the first collar and the flange portion of the second collar sandwiching the periphery of the attachment hole of the FRP member. The fastening member is sandwiched between the flange portion of the collar 2 near the head of the screw means and the head of the screw means, and the screw means is fastened to the female screw of the second collar tube portion. Therefore, the axial force of the screw means is received only by the first and second collar portions made of metal and does not apply to the FRP member. The FRP member is caused by screwing the second collar tube portion into the first collar tube portion, and the FRP member is formed by the flange portion of the first collar and the flange portion of the second collar. It is a pinching force for sandwiching the peripheral edge of the mounting hole, and the axial force of the screw means is not applied to the FRP member, but is received by the first and second collars made of metal, and the first and second collar parts made of metal. Complete. Therefore, creep of the FRP member due to the axial force of the screw means and loss of fastening force due to creep of the FRP member (reduction in axial force of the screw means) do not occur.

  Further, since the first collar and the second collar are screwed together, the distance between the flange portion of the first collar and the flange portion of the second collar is set according to the variation in the thickness of the FRP member. The gap between the collar flange portion and the FRP member plate surface can be absorbed. As a result, the flange portion of the first collar and the flange portion of the second collar can be brought into close contact with the FRP member by surface contact in the thickness direction, sufficient rigidity is obtained at the fastening portion, and a moment is applied to the fastening portion. Even if it is applied, the FRP member and the fastened member are not tilted (oscillated). As a result, strong fastening and sufficient rigidity can be obtained at the fastening part.

Below, the fastening device (fastening structure) of this invention is demonstrated with reference to FIGS.
1 to 5 show a fastening device according to a first embodiment of the present invention (FIGS. 4 and 5 are applicable to a second embodiment of the present invention), and FIGS. 6 to 8 illustrate a fastening device according to the second embodiment of the present invention. Indicates the device.
Portions common to the first and second embodiments of the present invention are denoted by the same reference numerals throughout the first and second embodiments of the present invention.

[Example 1]
First, the structure of Example 1 of this invention is demonstrated with reference to FIGS.
The fastening device 10 of the present invention includes an FRP (fiber reinforced resin) member 1 and a fastened member 2 (for example, a metal member, but the fastened member 2 is not limited to a metal member, and may be an FRP member). It is the fastening device which fastens. The fastening device 10 of the present invention can be applied to, for example, a fastening device that fastens the fastened member 2 to the FRP member 1 of a vehicle body.

  If the FRP member 1 is simply tightened with a bolt and a nut, the FRP member portion sandwiched between the bolt head and the nut may creep with a compressive force, and the fastening force may be reduced, causing the bolt to loosen. In the fastening device for fastening the fastened member 2 to the FRP member 1 with the screw means 30 with a head (for example, the bolt 30), the FRP member 1 is creeped while maintaining the high axial force of the bolt 30. It is intended to provide the fastening device 10 that does not cause creep or hardly causes creep.

The fastening device 10 of the present invention includes a metal collar 20 including first and second collars 21 and 22 for fastening the FRP member 1 and the member to be fastened 2, and screw means 30 with a head (for example, a bolt 30). ). Hereinafter, the bolt 30 will be described as an example of the screw means 30 with a head. However, the screw means 30 with a head may be screw means other than bolts, and may be, for example, a child screw such as a countersunk screw, a round screw, and a flat screw. Therefore, in the following description, the bolt 30 includes a female screw 30 and the like.
The collar 20 is divided into a first collar 21 having a flange portion 21b and a second collar 22 having a flange portion 22b, and the coupling of the first and second collars 21 and 22 is between the flange portions 21b and 22b. It is screwed so that the distance can be adjusted.

The first collar 21 is made of metal, has a cylindrical portion 21a and a flange portion 21b, and has an internal thread 23 formed on the inner peripheral surface of the cylindrical portion 21a.
The second collar 22 is made of metal, has a cylindrical portion 22a and a flange portion 22b, and has a male screw 24 that is screwed onto the outer peripheral surface of the cylindrical portion 22a with the female screw 23 of the cylindrical portion 21a of the first collar 21. And a female screw 25 is formed on the inner peripheral surface of the cylindrical portion 22a.
The bolt 30 has a head portion 30b and a shaft portion 30a, and a male screw 31 that is screwed with the female screw 25 of the cylindrical portion 22a of the second collar 22 is cut in the shaft portion 30a.

  The cylindrical portion 21a of the first collar 21 is inserted into the mounting hole 3 formed in the FRP member 1, the cylindrical portion 22a of the second collar 22 is inserted into the cylindrical portion 21a of the first collar 21, and the female screw 23 is inserted. And the male screw 24, and the flange portion 21b of the first collar 21 and the flange portion 22b of the second collar 22 sandwich the peripheral portion of the mounting hole of the FRP member 1 in the thickness direction of the FRP member 1, First and second collars 21 and 22 are attached to the FRP member 1.

  Of the flange portion 21b of the first collar 21 and the flange portion 22b of the second collar 22, the flange portion closer to the head 30b of the bolt 30 (the flange portion 22b in FIG. 1 and the flange portion 21b in FIG. 6) and the bolt The shaft member 30a of the bolt 30 is inserted through the mounting hole 4 formed in the member to be fastened 2 with the member 2 to be fastened between the head portion 30b of the bolt 30 and the bolt 30 is the cylindrical portion of the second collar 22. It is fastened to the female screw 25 of 22a. As a result, the fastened member 2 is fastened between the head portion 22 b of the bolt 30 and the collar 20, fixed by friction of the contact surface, and fastened to the collar 20. Because of the metal-to-metal surface contact, the bolt axial force can be increased and fastening is strong.

In the first collar 21, the flange portion 21b extends outward in the radial direction from the shaft portion 21a in a direction orthogonal to the axial direction on the entire circumference of the shaft portion 21a. Similarly, in the second collar 22, the flange portion 22b extends outward in the radial direction from the shaft portion 22a in a direction orthogonal to the axial direction on the entire circumference of the shaft portion 22a.
In the collar far from the fastened member 2 (the first collar 21 in FIG. 1 and the second collar 22 in FIG. 6), the flange portion also extends to the inner peripheral portion of the shaft portion to flange the inner space of the shaft portion. It may be closed at the part.

The screwed portions of the first and second collars 21 and 22 (the screwed portions of the female screw 23 and the male screw 24) are fixed by applying an adhesive so that no loosening of the screwing occurs. It is desirable. However, the adhesive may not be applied.
Similarly, it is desirable that an adhesive is applied and fixed to the contact surfaces of the flange portions 21b and 22b of the first and second collars 21 and 22 and the FRP member 1 so that rotational looseness does not occur. . However, the adhesive may not be applied.
When it is desired to remove the first and second collars 21 and 22 from the FRP member 1 when the adhesive is applied, the adhesive can be removed by applying heat to the adhesive to soften it.

In the screwing of the first and second collars 21 and 22, the distance b between the flange portions 21 b and 22 b of the first and second collars 21 and 22 is the production of the thickness a at the fastening portion of the FRP member 1. It is adjusted to absorb variations due to errors. This adjustment is easily performed because the first and second collars 21 and 22 are coupled with each other in a screwed structure. The distance b between the flange portions 21b and 22b of the first and second collars 21 and 22 is adjusted such that the flange portions 21b and 22b pinch the FRP member 1 with a pinching force that does not cause the FRP member 1 to creep. . This adjustment can be easily performed by adjusting the rotational moment (tightening torque around the axis) of the first and second collars 21 and 22 with a torque wrench.
The above configuration is applied not only to the first embodiment of the present invention but also to other embodiments of the present invention.

  The first embodiment of the present invention further has the following unique configuration. As shown in FIGS. 1 to 5, the fastened member 2 is a bolt through which the plate surface of the fastened member 2 is brought into close contact with the flange portion 22 b of the second collar 22 and inserted through the mounting hole 4 of the fastened member 2. 30 is tightened into the female screw 25 of the cylindrical portion 22a of the second collar 22, so that it is sandwiched between the bolt head portion 30b and the flange portion 22b of the second collar 22, and the second force is generated by the frictional force. The collar 22 is fixed.

Next, operations and effects of the first embodiment of the present invention will be described.
In the fastening device 10 of the present invention, the cylindrical portion 21 a of the first collar 21 is inserted into the mounting hole 3 formed in the FRP member 1, and the cylindrical portion of the second collar 22 is inserted into the cylindrical portion 21 a of the first collar 21. 22a is screwed, and the first and second collars 21 and 22 are sandwiched between the flange portion 21b of the first collar 21 and the flange portion 22b of the second collar 22 so as to sandwich the peripheral edge of the mounting hole 3 of the FRP member 1. Is attached to the FRP member 1. Further, the fastened member 2 is sandwiched between the flange portion 21b of the first collar 21 and the flange portion 22b of the second collar 22 that is closer to the bolt head portion 30b and the bolt head portion 30b, The bolt 30 is fastened to the female screw 25 of the cylindrical portion 22 a of the second collar 22. As a result, the bolt axial force is received only by the first and second collars 21 and 22 made of metal and does not apply to the FRP member 1. The FRP member 1 is applied to the flange portion 21b of the first collar 21 and the second collar which are generated when the tube portion 22a of the second collar 22 is screwed to the tube portion 21a of the first collar 21. 22 is a pinching force for pinching the peripheral edge of the mounting hole 3 of the FRP member 1 by the flange portion 22b (this pinching force is adjusted so as not to cause creep of the FRP member 1), and the bolt axial force is applied to the FRP member 1. It does not take. Therefore, the creep of the FRP member 1 due to the bolt axial force and the fastening force loss due to the creep of the FRP member 1 do not occur.

In addition, since the first collar 21 and the second collar 22 are screwed together, the flange portion 21b of the first collar 21 and the second collar 21 according to the variation in the thickness of the FRP member 1 due to manufacturing errors. The distance between the flange portions 22b of the two collars 22 can be adjusted, and the gap between the collar flange portions 21b and 22b and the plate surface of the FRP member 1 can be absorbed. Accordingly, the flange portion of the first collar and the flange portion of the second collar can be brought into close contact with the FRP member by surface contact in the thickness direction, and sufficient rigidity with respect to the moment can be obtained at the fastening portion. Even if a moment is applied, the FRP member 1 and the fastened member 2 are not tilted (oscillated).
Further, by eliminating a gap between the outer peripheral surface of the cylindrical portion of the collar 20 and the inner peripheral surface of the mounting hole 3 of the FRP member 1, the collar 20 and the FRP member 1 are fixed without any gap in any direction. Further, since the collar 20 and the fastened member 2 are sandwiched between the collar 20 and the bolt head 30b, they are fixed by friction in all directions. As a result, the collar 20 and the FRP member 1 and the collar 20 and the fastened member 2 are firmly fastened in all directions of the fastening portion.
The above operations and effects are applied not only to the first embodiment of the present invention but also to other embodiments of the present invention.

  The first embodiment of the present invention further has the following specific actions and effects. As shown in FIGS. 1 to 5, the fastened member 2 is a bolt through which the plate surface of the fastened member 2 is brought into close contact with the flange portion 22 b of the second collar 22 and inserted through the mounting hole 4 of the fastened member 2. 30 is tightened into the female screw 25 of the cylindrical portion 22a of the second collar 22, so that it is sandwiched between the bolt head portion 30b and the flange portion 22b of the second collar 22, and the second force is generated by the frictional force. The collar 22 is fixed.

  In addition, by fixing the first collar 21 to the FRP member 1 by press-fitting or adhesive application, the first collar 21 is flanged when the second collar 22 is screwed into the first collar 21. Even if the rotation is not suppressed by the portion 21 b, it is possible to prevent the first collar 21 from rotating around the second collar 22. Also, the second collar 22 is fixed to the first collar 21 with the screw fitting portions 23 and 24 with an adhesive, or the flange portion 22b of the second collar 22 is bonded to the plate surface of the FRP member 1 with an adhesive. By doing so, the rotation of the second collar 22 relative to the FRP member 1 is also suppressed, and the second collar when the bolt 30 is screwed into the female screw 25 of the cylindrical portion 22a of the second collar 22 is suppressed. Thus, the rotation of 22 (the rotation to the bolt 30) can be suppressed. These facilitate the fastening operation.

[Example 2]
Next, a specific configuration of the second embodiment of the present invention will be described. In the second embodiment of the present invention, as shown in FIGS. 6 to 8, the fastened member 2 is such that the plate surface of the fastened member 2 is in close contact with the flange portion 21 b of the first collar 21. The bolt 30 that passes through the mounting hole 4 is tightened into the female screw 25 of the cylindrical portion 22 a of the second collar 22, so that it is sandwiched between the bolt head portion 30 b and the flange portion 21 b of the first collar 21. Thus, the first collar 21 is fixed by frictional force. Compared with Example 1, Example 2 has the male and female collars reversed.

  Further, as shown in FIGS. 7 and 8, when the first and second collars 21 and 22 are screwed together, one of the first and second collars 21 and 22 rotates with the other, and the screw is tightened. In order to prevent this from happening, the outer shape of the flange portion 22b is made hexagonal to form the rotation prevention portion 6, and the rotation prevention portion 6 can be held with a spanner or the like to prevent rotation (FIG. 8). A hexagonal detent portion 5 may be formed at the end of 21a, and a hexagonal head of a tool may be inserted into the detent portion 5 so that the detent can be prevented (FIG. 7). In the case where such detents 5 and 6 are formed, the first and second collars 21 and 22 or the first and second collars 21 and 22 and the FRP member 1 are fixed by an adhesive. It does not have to be.

  As for the specific actions and effects of the second embodiment of the present invention, a tool is applied to one of the anti-rotation portions 5 and 6 of the first collar 21 and the second collar 22 to prevent one collar from rotating. By rotating the other collar, the other collar can be screwed into the one collar while preventing the rotation of the other collar. Further, when the bolt 30 is screwed into the second collar 22, a tool is applied to the anti-rotation portion 6 of the second collar 22 to prevent the rotation of the second collar 22. Try to tighten. Accordingly, it is possible to prevent the second collar 22 from being rotated when the bolt 30 is tightened. The first and second collars 21 and 22 may be prevented from rotating by using a method of putting a tool on the rotation stoppers 5 and 6 and fixing with the adhesive of the first embodiment.

It is sectional drawing after the fastening of the fastening apparatus of Example 1 of this invention, the FRP member fastened by it, and a to-be-fastened member. It is a perspective view of the 2nd collar of the fastening device of Example 1 of the present invention. It is a perspective view of the 1st color of the fastening device of Example 1 of the present invention. It is a perspective view of the fastening part vicinity of the FRP member fastened by the fastening apparatus of Example 1 (applicable also to Example 2) of this invention. It is a perspective view of the fastening part vicinity of the to-be-fastened member fastened by the fastening apparatus of Example 1 (applicable also to Example 2) of this invention. It is sectional drawing after the fastening of the fastening apparatus of Example 2 of this invention, the FRP member fastened by it, and a to-be-fastened member. It is a perspective view of the 1st color of the fastening device of Example 2 of the present invention. It is a perspective view of the 2nd collar of the fastening device of Example 2 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 FRP member 2 Fastened member 3 Attachment hole 4 Attachment holes 5, 6 Anti-rotation part 10 Fastening device 20 Collar 21 First collar 21a Tube part 21b Flange part 22 Second collar 22a Tube part 22b Flange part 23 Female screw 24 Male screw 25 Female screw 30 Screw means with head (for example, bolt)
30a Shaft portion 30b Head portion 31 Male thread a FRP member thickness b Distance between flange portions of the first and second collars

Claims (1)

A fastening device for fastening a FRP member and a member to be fastened,
A first collar made of metal having a cylindrical portion and a flange portion and having an internal thread formed on the inner peripheral surface of the cylindrical portion;
The metal part which has a cylinder part and a flange part, and the external thread formed in the outer peripheral surface of the cylindrical part to be screwed into the female thread of the cylindrical part of the first collar is formed, and the internal thread is formed on the inner peripheral surface of the cylindrical part The second color of
A bolt having a head and screwed into the female thread of the cylindrical portion of the second collar;
Have
The first collar tube portion is inserted into the mounting hole formed in the FRP member, the second collar tube portion is screwed into the first collar tube portion, and the flange portion and the second collar portion of the first collar are screwed together. The first and second collars are attached to the FRP member with the flange portion of the collar sandwiching the peripheral portion of the mounting hole of the FRP member.
Of the flange portion of the first collar and the flange portion of the second collar, a bolt is connected to the bolt head between the flange portion closer to the bolt head and the bolt head, and the bolt of the second collar tube portion Fastening device that is tightened into a female screw.

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