JP5299136B2 - Fastened member and fastening structure of fastened member - Google Patents

Description

  The present invention relates to a fastened member and a fastening structure of a fastened member.

  The resin molded body is a lightweight structural material and may be used by being attached to other parts by fastening members such as bolts and nuts. However, the resin molded body directly attached to the other member undergoes creep deformation due to the axial force, and the axial force of the fastening member decreases. Therefore, there is a problem that loosening occurs when the resin molded body and other members are fastened. In order to solve such a problem in the mounting of the resin molded body, generally, for example, a mounting method using a metal pipe as disclosed in Patent Document 1 is often used.

  Patent Document 1 discloses a structure in which a housing including a rotation detection device is attached to an in-vehicle engine. The housing is resin-molded with a flange for attachment to an in-vehicle engine. A metal pipe is inserted into and integrated with the through hole formed in the flange by insert molding. The housing is attached by fastening a bolt passed through a metal pipe to a female screw of an in-vehicle engine.

  Patent Document 2 discloses a structure in which a fiber insert that is a reinforcing fiber is arranged inside a plate-like fiber-reinforced composite material. The compression modulus of the fiber insert is higher than that of the fiber reinforced composite resin. A through hole into which a bolt is inserted is formed in the fiber reinforced composite material, and a fiber insert is arranged around the through hole in the thickness direction of the fiber reinforced composite material. The length of the fiber insert is equal to the length of the through hole, and the upper end and the lower end of the fiber insert are both exposed on the surface of the fiber-reinforced composite material.

JP 2006-275270 A Special table 2008-521657 gazette

  In Patent Document 1, since the axial force of the bolt acts only on the metal pipe and does not apply to the flange formed of a resin material, the problem of loosening due to resin creep can be solved. However, the method of integrating the metal pipe into the through hole into which the bolt is inserted requires a high mounting accuracy of the metal pipe. For example, when a metal pipe is insert-molded into the flange, as in the invention of Patent Document 1, a high-precision molding technique is performed so that no resin is interposed between the end surface of the metal pipe, the head of the bolt, and the vehicle-mounted engine. Is required. Moreover, in the method of press-fitting a metal pipe into a through hole, it is necessary to increase the accuracy of the through hole and the press-fitting accuracy of the metal pipe, so that the number of processing steps increases and the processing work becomes complicated.

  In Patent Document 2, the length of the fiber insert is equal to the length of the through hole formed in the fiber-reinforced composite material. When a fiber structure composed of reinforcing fibers is placed in a mold and then a resin is poured into the mold to compress the fiber-reinforced composite material, the dimensions of the substrate that is the structure of the reinforcing fibers before the resin is impregnated Shrinks in the compression direction, so the substrate is formed larger in the compression direction than the final fiber reinforced composite dimensions. If the fiber insert is inserted in the compression direction with respect to the substrate, the fiber insert is positively manufactured even if the length of the fiber insert is designed to match the thickness of the molded fiber reinforced composite. If an error occurs, the fiber reinforced composite material cannot be compressed below the length of the fiber insert, and the composite material cannot be molded to the desired dimensions. In addition, when a negative manufacturing error occurs in the fiber insert, the composite material after molding includes a portion where the fiber insert does not exist in the axial direction of the through hole. Deformation cannot be suppressed.

  According to the present invention, when a reinforcing member is disposed around a through hole in a resin fastening member in which a fastening through hole is formed, the final shape of the fastened member is defined by the length of the reinforcing member. Without creeping, creep deformation around the through hole can be suppressed.

  The present invention according to claim 1 is a member to be fastened made of resin in which a through hole for fastening is formed, and a reinforcing member having a higher compression elastic modulus than that of the resin in a stress acting region around the through hole Is arranged facing the axial direction of the through-hole, and the reinforcing member has one end exposed at the first surface of the fastened member and the other end opposite to the first surface. A first reinforcing member buried inside the second surface; and one end portion disposed adjacent to the first reinforcing member is exposed to the second surface and the other end portion is the first reinforcing member. The second reinforcing member is buried on the first surface side with respect to the other end of the reinforcing member and on the inner side with respect to the first surface.

  According to the first aspect of the present invention, since the reinforcing member is shorter than the length of the through hole in the to-be-fastened member after molding, when the to-be-fastened member is formed, the reinforcing member is inserted into the to-be-fastened member. Even if a positive manufacturing error occurs, the resin can be compressed in accordance with the dimensions of the mold, and the final shape of the fastened member is not defined by the length of the reinforcing member. Furthermore, since a region having a higher compression modulus than that of the resin can be continuously formed in the axial direction of the through hole from the first surface to the second surface of the member to be fastened, the stress acting region around the through hole Creep deformation in can be suppressed.

  In addition to the case where the reinforcing member is oriented parallel to the axis of the through-hole, the reinforcing member is arranged to face the axial direction of the through-hole (stress axis). Including the case where it is facing a slightly deviated direction.

  Note that being exposed means that the end face or end point of the reinforcing member, which is the end of the reinforcing member, is arranged on the same plane as the surface of the fastened member after fastening of the fastened member, for example, Prior to fastening of the fastened member, the end of the reinforcing member protrudes on the surface of the fastened member, and the end of the reinforcing member contacts the fastened member by pressing the fastening member against the protruding end. Including the case of being buried in contact.

  Further, the term “adjacently arranged” means that the first reinforcing member and the second reinforcing member are arranged adjacent to each other in the radial direction or the circumferential direction of the through hole, and in addition, the second reinforcing member is arranged in the vicinity of the first reinforcing member. The case where a reinforcement member is arrange | positioned is pointed out.

  Further, the reinforcing member is shorter than the length of the through-hole means that when one end of the reinforcing member is exposed on the first surface or the second surface of the fastened member, the other end of the reinforcing member is fastened. If the length is not exposed on the first surface or the second surface of the member (the length at which both ends of the reinforcing member are not exposed on the first surface or the second surface of the fastened member), the reinforcing member Includes those slightly shorter than the length of the through hole.

  The second reinforcing member is disposed adjacent to the first reinforcing member, and one end is exposed to the second surface and the other end is closer to the first surface than the other end of the first reinforcing member. And being buried inside the first surface means that a part of the first reinforcing member and the second reinforcing member adjacent to each other are arranged to face each other.

  The stress acting region is a region where the fastening member stress (axial force) acts on the fastening member when the fastening member is disposed in the fastening through hole formed in the fastening member or in the vicinity of the through hole. Point to.

  The present invention according to claim 2 is characterized in that the member to be fastened is a fiber reinforced composite material. Since the fastened member in which the reinforcing member is disposed contains reinforcing fibers, the amount of resin that causes creep in the fastened member is reduced. Therefore, the creep suppressing effect of the fastened member can be enhanced as compared with the case where the fastened member does not contain reinforcing fibers.

  The present invention according to claim 3 is characterized in that the reinforcing member is a fiber-reinforced composite material. Therefore, the weight of the reinforcing member can be reduced as compared with the metallic reinforcing member. Moreover, when recycling the fastening member in which the reinforcing member is disposed, it is not necessary to separate the fastening member and the reinforcing member.

  The present invention according to claim 4 is characterized in that the reinforcing member has a needle-like shape with at least one end portion sharpened. Therefore, it is easy to insert the reinforcing member into the fastened member.

  According to a fifth aspect of the present invention, the member to be fastened made of resin in which a through hole for fastening is formed, and the stress acting region around the through hole are arranged facing the axial direction of the through hole. The reinforcing member includes a reinforcing member having a higher compression elastic modulus than the resin, a fastening member that comes into contact with the fastened member, and another member fastened to the fastened member. A first reinforcing member that is exposed on the first surface of the fastened member and whose other end is buried inside a second surface opposite to the first surface; and One end portion is disposed adjacent to the second surface, and the other end portion is on the first surface side with respect to the other end portion of the first reinforcing member and on the inner side with respect to the first surface. And a second reinforcing member buried in the surface. Therefore, loosening of the fastening member when fastening the fastened member with another member can be suppressed.

  According to the present invention, when a reinforcing member is disposed around a through hole in a resin fastening member in which a fastening through hole is formed, the final shape of the fastened member is defined by the length of the reinforcing member. Without creeping, creep deformation around the through hole can be suppressed.

It is a cross-sectional schematic diagram explaining the to-be-fastened member 1, the 1st reinforcement member 4, and the 2nd reinforcement member 5 around the through-hole 3 which concerns on embodiment of this invention. (A) The schematic diagram which shows the shape of the 1st reinforcement member 4 which concerns on embodiment of this invention, (b) The schematic diagram which shows the root part 4b of the 1st reinforcement member 4 which concerns on embodiment of this invention. It is a schematic diagram explaining the arrangement | sequence of the 1st reinforcement member 4 and the 2nd reinforcement member 5 which concern on embodiment of this invention. It is a schematic diagram explaining the fastening structure of the to-be-fastened member 1 which concerns on embodiment of this invention.

(Embodiment)
An embodiment will be described with reference to FIGS. For convenience of illustration, some dimensions are exaggerated for easy understanding.

As shown in FIG. 1, the member 1 to be fastened includes a carbon fiber 2 that is a bundle-like reinforcing fiber using a thermosetting resin as a matrix, and is formed in a plate shape. In the member 1 to be fastened, the carbon fibers 2 are oriented in one direction (X-axis direction). 1 is a schematic cross-sectional view taken along a cross-sectional line AA in FIG. 3 described later.
A through-hole 3 into which a bolt 7 as a fastening member is inserted is formed in the fastened member 1. The cross section of the through-hole 3 is formed in a circular shape having a diameter into which the bolt 7 can be inserted.

  As shown in FIG. 2 (a), the first reinforcing member 4 disposed on the fastened member 1 is a fiber-reinforced composite material containing carbon fibers 6 with a thermosetting resin as a matrix, and has a conical shape. . The thermosetting resin as the matrix of the first reinforcing member 4 is the same type as the thermosetting resin as the matrix of the fastened member 1. The length (cone height) of the first reinforcing member 4 is shorter than the length of the through hole 3 of the fastened member 1. In the reinforcing member 4, the tip portion 4 a that is one end portion is formed in a sharp needle shape, and as shown in FIG. 2B, the root portion 4 b that is the other end portion in the first reinforcing member 4 is The cross section is circular. The second reinforcing member 5 described later has the same shape as the first reinforcing member 4. In the first reinforcing member 4 and the second reinforcing member 5, the carbon fibers 6 are oriented toward the central axis of the reinforcing member 4 (the axis in the Z-axis direction passing through the center of the reinforcing member).

  FIG. 3 shows the arrangement of the first reinforcing member 4 and the second reinforcing member 5 around the through hole 3 as viewed from the direction of the axis 3 a of the through hole 3. 3 corresponds to a plane that passes through the center of the through hole 3 in the direction of the axis 3a and is parallel to the upper surface 1a or the lower surface 1b of the member 1 to be fastened. As shown in FIG. 3, the first reinforcing member 4 and the second reinforcing member 5 are arranged around the through hole 3 of the fastened member 1. As shown in FIG. 1, in the first reinforcing member 4, a root portion 4 b having a circular cross section is exposed on the upper surface 1 a of the fastened member 1, and has a pointed needle shape in the first reinforcing member 4. The formed tip portion 4 a is embedded in the fastened member 1. Further, in the second reinforcing member 5, the root portion 5 b having a circular cross section is exposed on the lower surface 1 b of the fastened member 1, and the tip formed in a pointed needle shape in the second reinforcing member 5. The part 5 a is embedded in the fastened member 1. That is, the first reinforcing member 4 and the second reinforcing member 5 do not penetrate in the plate thickness direction (Z-axis direction) of the fastened member 1. The upper surface 1a is a surface of the fastened member 1 that is in contact with the head 7a of the bolt 7, and the lower surface 1b is a surface of the fastened member 1 that is opposite to the upper surface 1a.

  The first reinforcing member 4 and the second reinforcing member 5 are arranged adjacent to each other in the circumferential direction of the through hole 3. The root portion 4b of the first reinforcing member 4 is exposed on the upper surface 1a, and the tip portion 4a is buried inside the lower surface 1b opposite to the upper surface 1a. The second reinforcing member 5 is disposed adjacent to the first reinforcing member 4, the root portion 5 b of the second reinforcing member 5 is exposed on the lower surface 1 b, and the distal end portion 5 a is the distal end portion 4 a of the first reinforcing member 4. It is buried on the upper surface 1a side and on the inner side of the upper surface 1a. That is, a part of the first reinforcing member 4 and the second reinforcing member 5 that are disposed adjacent to each other are disposed to face each other. In FIG. 1, the length in the axis 3 a direction of the through-hole 3 in the first reinforcing member 4 and the second reinforcing member 5 in the region where the first reinforcing member 4 and the second reinforcing member 5 are arranged to face each other is indicated by L. . In the first reinforcing member 4 and the second reinforcing member 5 disposed on the fastened member 1, the carbon fibers 6 shown in FIG. 1 are oriented in the direction of the axis 3 a of the through hole 3. The root portion 4b of the first reinforcing member 4 is exposed in the region of the fastened member 1 in the vicinity of the through hole 3 and in contact with the head portion 7a of the bolt 7. The root portion 4b is the head portion of the bolt 7. 7a.

  As shown in FIG. 3, the first reinforcing member 4 and the second reinforcing member 5 are arranged concentrically adjacent to each other in the circumferential direction of the through hole and centered on the shaft 3 a of the through hole 3. In FIG. 3, the 1st reinforcement member 4 which is the reinforcement member by which the base part 4b is arrange | positioned in the surface (upper surface 1a) of the side contact | abutted with the volt | bolt 7 of the to-be-fastened member 1 is shown by a black circle (●). In FIG. 3, the second reinforcing member 5, which is a reinforcing member in which the root portion 5 b is arranged on the surface (lower surface 1 b) on the side where the fastened member 1 comes into contact with the metal material 8 described later, is indicated by a white circle (◯). . The first reinforcing member 4 and the second reinforcing member 5 are arranged concentrically adjacent to each other in the circumferential direction of the through hole 3 and centered on the shaft 3a of the through hole 3, and the root portion 4b and the root portion 5b are covered with each other. Different surfaces of the fastening member 1 (the base portion 4b is exposed on the upper surface 1a and the root portion 5b is exposed on the lower surface 1b). The first reinforcing member 4 and the second reinforcing member 5 are not exposed on the inner peripheral surface of the through hole 3, and are arranged at a distance from the inner peripheral surface of the through hole 3. Moreover, the 1st reinforcement member 4 and the 2nd reinforcement member 5 are arranged so that it may not line up on the same straight line of the X-axis direction which is the orientation direction of the carbon fiber 2 which comprises the to-be-fastened member 1. FIG.

The fastening structure of the fastened member 1 will be described with reference to FIG.
The member 1 to be fastened is fastened to a metal material 8 which is another member as follows. The metal material 8 has a through hole 9 for fastening. The lower surface 1b of the fastened member 1 and the upper surface of the metal material 8 are in contact with each other, and the shaft 3a of the fastening through hole 3 formed in the fastened member 1 and the metal material 8 are formed. The shaft 9a of the through hole 9 for fastening coincides to form a set of through holes. The bolt 7 as a fastening member is inserted into the through hole 3 formed in the fastened member 1, and the head 7 a of the bolt 7 is in contact with the fastened member 1.

  The central axes of the first reinforcing member 4 and the second reinforcing member 5 are arranged facing the axis 3 a of the through hole 3. The first reinforcing member 4 and the second reinforcing member 5 are formed shorter than the plate thickness of the fastened member 1. The base portion 4b of the first reinforcing member 4 is exposed on the upper surface 1a of the fastened member 1 (the surface on the side in contact with the bolt 7), and the head 7a of the bolt 7 and the fastened member 1 are in contact with each other. The root portion 4 b exposed in the region to be touched is in contact with the head portion 7 a of the bolt 7. Further, in the second reinforcing member 5, the root portion 5 b is exposed on the lower surface 1 b of the fastened member 1 (the surface of the fastened member 1 on the metal material 8 side) and abuts on the upper surface of the metal material 8. ing. In FIG. 4, a region where the stress of the bolt 7 acts on the fastened member 1 (stress acting region) is indicated by S. The second reinforcing member 5 adjacent to the first reinforcing member 4 that is in contact with the head portion 7a of the bolt 7 is disposed in the region S. The interval between the adjacent first reinforcing member 4 and the second reinforcing member 5 is wide enough not to damage the carbon fibers 6 constituting the fastened member 1, and the adjacent first reinforcing member 4 and second reinforcing member 5 are within the region S. It is narrow enough to be placed in The tip of the first reinforcing member second reinforcing member bolt 7 protrudes below the metal material 8 through a through hole 9 formed in the metal material 8 and is tightened by a nut 10.

Next, the manufacturing method of the to-be-fastened member 1 in which the 1st reinforcement member 4 and the 2nd reinforcement member 5 are arrange | positioned is demonstrated.
A unidirectional material (UD material) in which carbon fibers 2 are arranged in one direction (X direction) is disposed on a flat support. The 1st reinforcement member 4 and the 2nd reinforcement member 5 in which the fiber reinforced composite material was formed in the needle shape are inserted in the predetermined position of UD material. At this time, the central axes of the first reinforcing member 4 and the second reinforcing member 5 face the direction (Z direction) perpendicular to the arrangement direction of the carbon fibers 2 in the UD material and the plane formed by the support.

  The UD material on which the first reinforcing member 4 and the second reinforcing member 5 are arranged is compression-molded into a molded body using a compression mold. The mold includes an upper mold and a lower mold, and includes a pressure reducing passage for reducing the pressure in the mold in a clamped state and a resin injection passage for injecting resin into the mold. In a state where the upper mold is opened, the UD material on which the first reinforcing member 4 and the second reinforcing member 5 are disposed is disposed on the lower mold. Next, in a state where the upper die is closed and the inside of the die is depressurized to a state close to a vacuum, a thermosetting resin as a matrix is injected into the die, and the first reinforcing member 4 and the second reinforcing member 5 are disposed. Impregnate the material.

  Next, the mold is heated above the thermosetting temperature of the thermosetting resin by a heating means (not shown), and the impregnated thermosetting resin is cured. After the temperature of the mold is lowered, the mold is opened, and the molded body in which the thermosetting resin is cured is taken out from the lower mold. The molded body is a fiber reinforced composite material composed of a first reinforcing member 4, a second reinforcing member 5, a UD material, and a thermosetting resin as a matrix, and the fastened member 1, the first reinforcing member 4 and the second reinforcing member. The member 5 is integrally formed. A through hole 3 is formed by a drill at a predetermined position of the molded body.

The effect | action of the to-be-fastened member 1 in embodiment is demonstrated.
A first reinforcing member 4 and a second reinforcing member 5, which are fiber reinforced composite materials, are disposed around the through hole 3 in the fastened member 1. The first reinforcing member 4 and the second reinforcing member 5 are arranged in the direction of the axis 3 a of the through hole 3. In the first reinforcing member 4 and the second reinforcing member 5, the carbon fiber 6 is in the direction of the axis 3 a of the through hole 3. It is oriented toward (the plate thickness direction of the fastened member 1). Therefore, the compression elastic modulus of the first reinforcing member 4 and the second reinforcing member 5 is about 40 times larger than the compression elastic modulus of the thermosetting resin that is the matrix of the fastened member 1.

  When compression molding a fiber reinforced composite material, the dimension of the base material, which is the structure of the reinforcing fiber before impregnation with the thermosetting resin, is more compressive than the dimension of the molded body that is the fiber reinforced composite material to be molded. Shrink to. When the reinforcing member is longer than the desired size of the formed body when the formed body is formed to a desired size, compression of the base material impregnated with the resin is limited by the reinforcing member. That is, the dimension of the compact in the compression direction is defined by the length of the reinforcing member. Since the 1st reinforcement member 4 and the 2nd reinforcement member 5 are formed shorter than the length of the through-hole 3 in the to-be-fastened member 1 after shaping | molding, the front-end | tip part 4a in the 1st reinforcement member 4, the root part 4b, and 2nd Both the end portions 5a and the root portions 5b of the reinforcing member 5 can be arranged without being exposed to the surface of the base material. When the member 1 to be fastened is molded, it can be compression-molded according to the dimensions of the mold, so that even if a positive manufacturing error occurs in the reinforcing member inserted into the member to be fastened, for example The resin can be compressed in accordance with the dimensions of the mold, and when the molded body is formed by impregnating the resin on the UD material on which the first reinforcing member 4 and the second reinforcing member 5 are disposed, The final shape is not defined by the lengths of the first reinforcing member 4 and the second reinforcing member 5.

  The front end portions 4a and 5a and the base portions 4b and 5b of the first reinforcing member 4 and the second reinforcing member 5 that are disposed adjacent to each other are exposed to the upper surface 1a and the lower surface 1b that are different surfaces of the fastened member 1. ing. Therefore, the stress applied to the fastened member 1 is caused by the first reinforcing member 4 and the fastened member 1 exposed on the upper surface 1a of the fastened member 1 (the surface of the fastened member 1 on the side in contact with the bolt 7). It is shared by the second reinforcing member 5 exposed on the lower surface 1b (surface on the side to be in contact with the metal member 8 in the fastened member 1).

The first reinforcing member 4 is formed shorter than the length of the through hole 3. The front end 4a of the first reinforcing member 4 does not reach the lower surface 1b of the fastened member 1, and when the second reinforcing member does not exist, the front end 4a of the first reinforcing member 4 and the fastened member 1 The thermosetting resin between the lower surface 1b undergoes creep deformation. Even if the first reinforcing member 4 and the second reinforcing member 5 are formed to be shorter than the length of the through hole 3, the front end portion 5 a of the second reinforcing member 5 is higher than the front end portion 4 a of the first reinforcing member 4. When the first reinforcing member 4 and a part of the second reinforcing member 5 (a part corresponding to L) are disposed facing each other on the side and inside the upper surface 1a, The axial force of the bolt 7 is transmitted to the second reinforcing member 5 through the thermosetting resin layer between the first reinforcing member 4 and the second reinforcing member 5. Therefore, in the periphery of the through hole 3 of the member 1 to be fastened, a region having a higher compressive modulus than the thermosetting resin contained in the member 1 to be fastened extends from the upper surface 1a to the lower surface 1b of the member 1 to be fastened. Since it can be formed continuously in the direction of the axis 3a of the through hole 3, it is between the tip 4a and the lower surface 1b of the first reinforcing member 4 and between the tip 5a and the upper surface 1a of the second reinforcing member 5. Creep of the thermosetting resin present in is suppressed.
However, when the interval between the first reinforcing member 4 and the second reinforcing member 5 arranged adjacent to each other is wide, the thermosetting resin between the first reinforcing member 4 and the second reinforcing member 5 is shear-deformed. Cheap.

  The member 1 to be fastened contains a carbon fiber 2 in addition to a thermosetting resin as a matrix. Compared with the case where the member 1 to be fastened does not contain the carbon fiber 2, the amount of the thermosetting resin that causes creep is reduced. Therefore, the effect which suppresses a creep can be heightened by using a fiber reinforced composite material as the to-be-fastened member 1 by which the 1st reinforcement member 4 and the 2nd reinforcement member 5 are arrange | positioned.

  Further, in the member 1 to be fastened, the carbon fibers 2 are oriented in a direction (X direction) perpendicular to the direction of the axis 3 a of the through hole 3. Therefore, the carbon fiber 2 is located in the first reinforcing member 4 and the second reinforcing member 5 adjacent to each other, and is disposed in the direction of the axis 3a of the through hole 3 from the upper surface 1a to the lower surface 1b of the member 1 to be fastened. In addition, a region having a high compression elastic modulus can be formed continuously in the direction perpendicular to the axis 3a of the through hole 3 from the left side surface to the right side surface of the member 1 to be fastened. Accordingly, the fastening member 1 can receive the stress due to fastening in a region having a high compression elastic modulus, and creep deformation of the fastened member 1 is suppressed.

The 1st reinforcement member 4 and the 2nd reinforcement member 5 consist of the thermosetting resin and carbon fiber 6 as a matrix, and are not metal members. Therefore, the increase in the weight in a fastening structure which arises when attaching a metal pipe like patent document 1 can be prevented.
Further, in the fastened member 1 to which the first reinforcing member 4 and the second reinforcing member 5 are fixed, when the fastened member 1 is discarded, the fastened member 1 and the first reinforcing member 4 that is a fiber-reinforced composite material and Since it is not necessary to separate the 2nd reinforcement member 5, the cost concerning recycling can be reduced.

  Furthermore, when the difference in thermal expansion coefficient between the thermosetting resin that is the matrix of the fastened member 1 and the first reinforcing member 4 and the second reinforcing member 5 is large, the first reinforcing member 4 and the second reinforcing member 5 are arranged. When using the fastened member 1 to be fastened at a high temperature, there is a possibility that a problem such as a crack may occur between the fastened member 1 and the first reinforcing member 4 and the second reinforcing member 5. Therefore, it is desirable that the difference between the thermosetting resin constituting the fastened member 1 and the thermal expansion coefficients of the first reinforcing member 4 and the second reinforcing member 5 is small. When the thermosetting resin contained in the first reinforcing member 4 and the second reinforcing member 5 is the same type as the thermosetting resin contained in the fastened member 1, the thermosetting that constitutes the fastened member 1. The difference between the resin and the thermal expansion coefficient of the thermosetting resin constituting the first reinforcing member 4 and the second reinforcing member 5 can be eliminated. Moreover, since the thermosetting resin contained in the 1st reinforcement member 4 and the 2nd reinforcement member 5 is the same kind as the thermosetting resin contained in the to-be-fastened member 1, the 1st reinforcement member 4 and the 2nd reinforcement member 5 and the to-be-fastened member 1 have good adhesiveness.

  The distal end portion 4a of the first reinforcing member 4 and the distal end portion 5a of the second reinforcing member 5 are needle-shaped with sharp end portions. Therefore, it is easy to insert the first reinforcing member 4 and the second reinforcing member 5 into the fastened member 1.

  The first reinforcing member 4 and the second reinforcing member 5 are disposed around the through hole 3 of the member 1 to be fastened, and the fastened member 1 is fastened to the metal material 8 by the bolt 7 inserted into the through hole 3. Yes. Therefore, in the case where the fastened member 1 and the metal material 8 are fastened by the bolt 7, loosening of the bolt 7 can be suppressed.

  In the member 1 to be fastened, the carbon fiber 2 is formed as a UD material oriented in one direction. Therefore, when the first reinforcing member 4 and the second reinforcing member 5 are arranged in alignment with the orientation direction of the UD material, the fastening is performed along the place where the first reinforcing member 4 and the second reinforcing member 5 are arranged. There is a possibility that a crack may occur in the thermosetting resin of the member 1. The first reinforcing member 4 and the second reinforcing member 5 are concentrically arranged adjacent to each other in the circumferential direction of the through hole 3 and centered on the shaft 3 a of the through hole 3, and the carbon fibers 2 constituting the fastened member 1. Are arranged so as not to be aligned on the same straight line in the X-axis direction, which is the orientation direction of the. Therefore, cracks are unlikely to occur at locations where the first reinforcing member 4 and the second reinforcing member 5 are disposed.

  When the interval between the adjacent first reinforcing member 4 and the second reinforcing member 5 is narrow, when the carbon fiber 2 constituting the fastened member 1 comes into contact with the first reinforcing member 4 or the second reinforcing member 5, the carbon fiber 2. May be damaged by being sandwiched between the adjacent first reinforcing member 4 and the second reinforcing member 5 or contacting the carbon fibers 2 with each other. The interval between the first reinforcing member 4 and the second reinforcing member 5 that are adjacent to each other may cause the carbon fibers 2 that are in contact with the first reinforcing member 4 and the second reinforcing member 5 to escape to the region constituted by the resin in the fastened member. Since it is as wide as possible, there is no fear of damaging the carbon fibers 2 constituting the fastened member 1.

  Further, the second reinforcing member 5 adjacent to the first reinforcing member 4 in contact with the head 7 a of the bolt 7 is included in the region S. Therefore, the stress due to the fastening of the bolt 7 is carried by the first reinforcing member 4 and the second reinforcing member 5 exposed on different surfaces of the fastened member 1, and the stress of the bolt 7 in the fastened member 1 is relieved.

  The first reinforcing member 4 and the second reinforcing member 5 do not need to be press-fitted into the through hole 3 of the fastened member 1 unlike the metal pipe of Patent Document 1. Further, it is not necessary to increase the processing accuracy of the through hole 3 formed in the fastened member 1 and the press-fitting accuracy of the first reinforcing member 4 and the second reinforcing member 5, and the processing is facilitated.

The above-described embodiment has the following operational effects.
(1) The member 1 to be fastened has a through hole 3 for fastening and contains a thermosetting resin. Bolts 7 are inserted through the through holes 3, and a first reinforcing member 4 and a second reinforcing member 5 are arranged in the stress acting region around the through hole 3 so as to face the axial direction of the through hole 3. The compression elastic modulus of the first reinforcing member 4 and the second reinforcing member 5 is higher than the thermosetting resin of the fastened member 1, and the length of the first reinforcing member 4 and the second reinforcing member 5 is the fastened member after molding. 1 is formed to be shorter than the length of the through hole 3. The root portion 4b of the first reinforcing member 4 is exposed on the upper surface 1a, and the tip portion 4a is buried inside the lower surface 1b opposite to the upper surface 1a. The second reinforcing member 5 is disposed adjacent to the first reinforcing member 4, the root portion 5 b of the second reinforcing member 5 is exposed on the lower surface 1 b, and the distal end portion 5 a is the distal end portion 4 a of the first reinforcing member 4. It is buried on the upper surface 1a side and on the inner side of the upper surface 1a. Therefore, when the member 1 to be fastened is molded, the thermosetting resin can be compressed in accordance with the dimensions of the mold, and is not defined by the length of the first reinforcing member 4 or the second reinforcing member 5. The to-be-fastened member 1 can be shape | molded to a desired dimension. Moreover, since the area | region where compression elastic modulus is higher than the thermosetting resin of the to-be-fastened member 1 can be continuously formed in the circumference | surroundings of the through-hole 3 from the upper surface 1a to the lower surface 1b, Creep deformation of the thermosetting resin of the fastened member 1 in the surrounding stress acting region can be suppressed.

(2) The fastened member 1 contains carbon fibers 2 in addition to the thermosetting resin as a matrix. Since the amount of the thermosetting resin that causes creep is reduced as compared with the case where the member 1 to be fastened does not contain the carbon fiber 2, the member 1 to be fastened to which the first reinforcing member 4 and the second reinforcing member 5 are fastened. By using a fiber reinforced composite material, the effect of suppressing creep can be enhanced.

(3) In the fastened member 1, the carbon fibers 2 are oriented in a direction (X direction) perpendicular to the direction of the axis 3 a of the through hole 3. Therefore, the carbon fibers 2 are arranged in the direction perpendicular to the axis 3a of the through-hole 3 and the axis 3a of the through-hole 3 together with the regions arranged opposite to each other in the adjacent first reinforcing member 4 and second reinforcing member 5. A region having a high compressive elastic modulus can be formed continuously, and the stress due to fastening in the fastened member 1 can be received in a region having a high compressive elastic modulus.

(4) Since the 1st reinforcement member 4 and the 2nd reinforcement member 5 consist of thermosetting resin and carbon fiber 6 as a matrix, compared with the case where the 1st reinforcement member 4 and the 2nd reinforcement member 5 are formed with a metal. Thus, an increase in weight in the fastening structure can be prevented.

(5) In the fastened member 1 to which the first reinforcing member 4 and the second reinforcing member 5 are fixed, the fastened member 1 and the inserted metal separate member are separated when the fastened member 1 is discarded. Since there is no need to do this, the cost for recycling can be reduced.

(6) The first reinforcing member 4 and the second reinforcing member 5 are fiber reinforced composite materials, and the resin contained in the first reinforcing member 4 and the second reinforcing member 5 is the same type as the resin contained in the fastened member 1. Therefore, the difference in thermal expansion coefficient between the first reinforcing member 4 and the second reinforcing member 5 and the resin contained in the fastened member 1 can be reduced. Further, the first reinforcing member 4 and the second reinforcing member 5 and the fastened member 1 are preferably bonded.

(7) The distal end portion 4a of the first reinforcing member 4 and the distal end portion 5a of the second reinforcing member 5 are needle-shaped with sharp end portions. Therefore, when the first reinforcing member 4 and the second reinforcing member 5 are arranged on the fastened member 1, it is easy to insert into the fastened member 1.

(8) The 1st reinforcement member 4 and the 2nd reinforcement member 5 are arrange | positioned around the through-hole 3 of the to-be-fastened member 1, and the to-be-fastened member 1 is the metal material 8 with the volt | bolt 7 inserted in the through-hole 3. Since it is fastened, loosening of the bolt 7 can be suppressed when the fastened member 1 and the metal material 8 are fastened by the bolt 7.

(9) The carbon fiber 2 that is in contact with the first reinforcing member 4 and the second reinforcing member 5 is made of resin in the fastened member 1 because the interval between the adjacent first reinforcing member 4 and the second reinforcing member 5 is wide. Therefore, there is no possibility of damaging the carbon fibers 2 constituting the fastened member 1.

(10) The second reinforcing member 5 adjacent to the first reinforcing member 4 that comes into contact with the head portion 7a of the bolt 7 is included in the region S. Therefore, the stress due to the fastening of the bolt 7 is carried by the first reinforcing member 4 exposed on the upper surface 1a of the fastened member 1 and the second reinforcing member 5 exposed on the lower surface 1b of the fastened member 1, The stress of the bolt 7 in the fastened member 1 is relieved.

(11) Unlike the metal pipe in Patent Document 1, it is not necessary to press-fit the first reinforcing member 4 and the second reinforcing member 5 into the through hole 3 of the fastened member 1. Further, it is not necessary to increase the processing accuracy of the through hole 3 formed in the fastened member 1 and the press-fitting accuracy of the first reinforcing member 4 and the second reinforcing member 5, and the processing is facilitated.

  The present invention is not limited to the configuration of the embodiment described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

  In the embodiment, the reinforcing fibers constituting the fastened member 1, the first reinforcing member 4, and the second reinforcing member 5 may not be carbon fibers. For example, glass fiber may be used.

  In the embodiment, the shape of the first reinforcing member 4 and the second reinforcing member 5 may not be formed in a needle shape with one end portion sharpened. For example, the shape may be an elongated columnar shape, or the reinforcing member having an elongated columnar shape may have a shape in which one end is chamfered.

  In the embodiment, the carbon fibers 6 constituting the first reinforcing member 4 and the second reinforcing member 5 are slightly displaced from the central axis (the axis 3a of the through hole 3) of the first reinforcing member 4 and the second reinforcing member 5. It may be oriented in the direction. When the angle formed by the orientation direction (fiber axis) of the carbon fiber 6 and the axis a (stress axis) of the through hole is 0 °, the compression elastic modulus of the fiber-reinforced composite material containing the carbon fiber 6 is maximized. If the angle formed by the fiber axis and the stress axis is small, the compression elastic modulus of the fiber-reinforced composite material is close to the maximum. For example, when the compression modulus of the fiber reinforced composite material when the angle between the fiber axis and the stress axis is 0 ° is 100%, the fiber reinforced composite material when the angle between the fiber axis and the stress axis is 10 °. The compression modulus is 80%. Therefore, the angle formed by the orientation direction of the carbon fiber 6 and the axis 3a of the through hole 3 is preferably within 10 °.

  In the embodiment, the first reinforcing member 4 and the second reinforcing member 5 may not be fiber reinforced composite materials. For example, a metal may be used. In that case, as a kind of metal, the thing with a small difference of a thermal expansion coefficient with resin of the to-be-fastened member 1 like a stainless steel, for example is desirable. When the 1st reinforcement member 4 and the 2nd reinforcement member 5 are metal, compared with the case where the 1st reinforcement member 4 and the 2nd reinforcement member 5 are formed with a fiber reinforced composite material, it can reduce the cost of components. it can.

  In the embodiment, the fastening member that is in contact with the base portion 4 b of the first reinforcing member 4 may not be the bolt 7. For example, a nut or a washer arranged near the through hole 3 may be used.

  In the embodiment, the through-hole 3 may not be formed by a drill in the fastened member 1 after molding. For example, the to-be-fastened member 1 may be formed using a forming die including a pipe having a diameter into which the through-hole 3 can be inserted, so that the through-hole 3 may be formed at a forming stage in a region corresponding to the pipe. . In that case, it is not necessary to form the fastening through-hole 3 in the to-be-fastened member 1 after molding, and when the through-hole 3 is formed with a tool in the to-be-fastened member 1, there is a risk that the cutting tool of a tool such as a drill may be damaged. Absent.

  -In embodiment, the manufacturing method of the to-be-fastened member 1 may be manufactured with the manufacturing method of the appropriate fiber reinforced composite material used conventionally other than the method described in embodiment.

  In embodiment, the to-be-fastened member 1 in which the 1st reinforcement member 4 and the 2nd reinforcement member 5 are arrange | positioned does not need to contain the carbon fiber 2. FIG. For example, a resin molded body may be used.

  In the embodiment, the carbon fibers 2 constituting the fastened member 1 may not be formed in a unidirectional material (UD material). For example, the carbon fibers 2 constituting the member 1 to be fastened may be oriented two-dimensionally or may be formed in a three-dimensionally oriented three-dimensional woven structure.

  In the embodiment, the other member fastened to the fastened member 1 may not be the metal material 8. For example, it may be a fiber reinforced composite material or a resin molded body, or may be a rock that constitutes a wall, floor, or ground. Further, the other member to be fastened to the fastened member 1 may have another shape such as a rod shape or a column shape instead of the plate shape.

  In the embodiment, the first reinforcing member 4 and the second reinforcing member 5 may not be arranged concentrically around the through hole 3 in a plane parallel to the surface of the fastened member 1. It is sufficient that the carbon fibers 2 are not arranged so that they are not aligned with the alignment direction of the carbon fibers 2. For example, the carbon fibers 2 are aligned along a straight line that faces in a direction different from the alignment direction of the carbon fibers 2 constituting the fastened member 1. May be. Further, the first reinforcing member 4 and the second reinforcing member 5 may be disposed in a region other than the region in contact with the head 7 a of the bolt 7.

  In the embodiment, the resin contained in the fastened member 1 may not be a thermosetting resin, but may be a thermoplastic resin. In that case, after the resin at a predetermined position in the fastened member 1 is melted by, for example, ultrasonic waves, the first reinforcing member 4 and the second reinforcing member 5 may be inserted into the melted resin.

  In the embodiment, the first reinforcing member 4 and the second reinforcing member 5 may not be molded integrally with the fastened member 1 after being inserted into the fiber structure made of carbon fibers forming the fastened member 1. . After the hole to which the 1st reinforcement member 4 and the 2nd reinforcement member 5 are inserted is formed in the to-be-fastened member 1 with a needle | hook etc., the 1st reinforcement member 4 and the 2nd reinforcement member 5 may be inserted in a hole.

  In the embodiment, in addition to the first reinforcing member 4 and the second reinforcing member 5 arranged in the direction of the axis 3 a of the through hole 3, the first reinforcing member 4 and the second reinforcing member 5 arranged adjacent to each other. The third reinforcing member may be arranged in a direction parallel to a plane including both the central axes and in an oblique direction with respect to the axis 3 a of the through hole 3. Since the third reinforcing member is disposed in the thermosetting resin between the first reinforcing member 4 and the second reinforcing member 5, the thermosetting resin layer is less likely to undergo shear deformation. Therefore, when the third reinforcing member is disposed, the interval between the adjacent first reinforcing member 4 and second reinforcing member 5 may be wider than the configuration of the embodiment. Further, even when the third reinforcing member is disposed, the upper limit of the interval between the adjacent first reinforcing member 4 and the second reinforcing member 5 is the stress acting region of the first reinforcing member 4 and the adjacent second reinforcing member. To the extent that it is arranged inside the region S.

  In the embodiment, the interval between the adjacent first reinforcing member 4 and the second reinforcing member 5 is such that at least the second reinforcing member 5 adjacent to the first reinforcing member 4 in contact with the head portion 7a of the bolt 7 is the region S. If it is included in, it is not restricted to the space | interval described in embodiment. Moreover, when the to-be-fastened member 1 is a resin molding, the space | interval of the adjacent 1st reinforcement member 4 and the 2nd reinforcement member 5 is resin between the adjacent 1st reinforcement member 4 and the 2nd reinforcement member 5. It may be as narrow as possible.

  In the embodiment, the region (L) where the adjacent first reinforcing member 4 and the second reinforcing member 5 are arranged to face each other may not be formed longer than half the length of the through hole 3 in the fastened member 1. Good. The length of the through hole 3> L> 0 may be satisfied. Furthermore, it is preferable that (L / the length of the through hole 3) is large in a range smaller than 100%. Since the one where (L / length of the through-hole 3) is large can form a region with a high compression elastic modulus, the effect of suppressing the creep deformation of the fastened member 1 is enhanced.

DESCRIPTION OF SYMBOLS 1 Fastened member 1a Upper surface 1b Lower surface 3 Through-hole 3a Axis 4 1st reinforcement member 4b Root part 5 2nd reinforcement member 5b Root part 7 Bolt 7a Head 8 Metal material

Claims (5)

A fastening member made of resin in which a through hole for fastening is formed,
In the stress acting region around the through hole, a reinforcing member having a higher compression elastic modulus than the resin is arranged facing the axial direction of the through hole,
The reinforcing member has a first end exposed at the first surface of the member to be fastened and a second end buried inside the second surface opposite to the first surface. The reinforcing member and the first reinforcing member are disposed adjacent to each other, one end of the reinforcing member is exposed to the second surface, and the other end is the first end than the other end of the first reinforcing member. A member to be fastened, comprising: a second reinforcing member buried on the surface side and inside the first surface.   The member to be fastened according to claim 1, wherein the member to be fastened is a fiber-reinforced composite material.   The fastened member according to claim 1, wherein the reinforcing member is a fiber reinforced composite material.   The to-be-fastened member according to claim 1, wherein the reinforcing member has a needle shape with a sharp end. A member to be fastened made of resin in which a through hole for fastening is formed;
A reinforcing member having a higher compression elastic modulus than the resin disposed in the stress acting region around the through hole in the axial direction of the through hole;
A fastening member in contact with the fastened member;
It consists of other members to be fastened with the fastened member,
The reinforcing member has a first end exposed at the first surface of the member to be fastened and a second end buried inside the second surface opposite to the first surface. The reinforcing member and the first reinforcing member are disposed adjacent to each other, one end of the reinforcing member is exposed to the second surface, and the other end is the first end than the other end of the first reinforcing member. A fastening structure for a member to be fastened, comprising a second reinforcing member buried on the surface side and inside the first surface.