JP6991085B2 - Bracket mounting structure to FRP material - Google Patents

Description

The present invention relates to a bracket mounting structure to a member made of fiber reinforced plastic (hereinafter referred to as FRP material), in particular, a bracket mounting structure for fastening an object to be fastened to the FRP material with a fastener.

Conventionally, when fastening an object to be fastened to an FRP material, a method of adhesively fixing a bracket provided with a collar portion to the FRP material, inserting a fastener through the collar portion, and fastening the FRP material to the object to be fastened. be. The collar portion is fitted into a hole provided in the FRP material, and is adhesively fixed to the FRP material by an adhesive arranged in a gap between the outer peripheral surface of the collar portion and the inner peripheral surface of the hole. Patent Document 1 discloses a related technique.

JP-A-2007-332975

However, since the adhesive is creep-deformed, the size of the gap changes, and the relative positional relationship between the bracket and the FRP material, and eventually the relative positional relationship between the FRP material and the object to be fastened, changes over time. Sometimes. As a method of suppressing this, it is conceivable to press-fit the collar part into the hole in order to make the adhesive layer as thin as possible, but press-fitting requires strict control of the tightening margin and is not suitable for mass production. be.

An object of the present invention is to suppress a relative displacement between the FRP material and the bracket due to creep deformation of the adhesive in a structure in which the bracket is adhered and fixed to the FRP material.

The bracket mounting structure according to one aspect of the present invention includes first and second metal bracket members bonded to the FRP material, and rivets that penetrate the FRP material in the thickness direction and fasten them. .. The first bracket member includes a collar portion having a through hole for inserting a fastener, and a protrusion portion that protrudes in the thickness direction at a position separated from the collar portion and is fitted into a hole provided in the FRP material. ,including. The outer peripheral surface of the body of the rivet is in surface contact with the inner peripheral surface of the hole through which the rivet penetrates in the FRP material.

According to the present invention, in a structure in which a bracket is adhered and fixed to an FRP material, relative displacement between the FRP material and the bracket due to creep deformation of the adhesive can be suppressed.

It is a top view of the bracket mounting structure which concerns on 1st Embodiment. FIG. 1A is a cross-sectional view taken along the line IB-IB of FIG. 1A. It is sectional drawing for demonstrating the fastening method by a rivet. It is sectional drawing for demonstrating the fastening method by a rivet, and shows the caulking state. It is sectional drawing of the bracket mounting structure which concerns on a comparative example. It is a top view of the bracket mounting structure which concerns on 2nd Embodiment. It is a top view of the bracket mounting structure which concerns on 3rd Embodiment. It is a top view of the bracket mounting structure which concerns on 4th Embodiment. It is a top view of the bracket mounting structure which concerns on 5th Embodiment. It is a top view of the bracket mounting structure which concerns on the modification of 5th Embodiment. It is a top view of the bracket mounting structure which concerns on 6th Embodiment. It is sectional drawing of the bracket mounting structure which concerns on a modification.

Hereinafter, the bracket mounting structure according to some embodiments will be described with reference to FIGS. 1A to 9. In the following description, terms indicating directions such as "up" and "down" are defined for convenience to explain the positional relationship of each part, and do not limit the actual mounting posture and the like.

<First Embodiment>
As shown in FIGS. 1A and 1B, the bracket mounting structure according to the first embodiment includes an FRP material 1, a bracket 2, and two rivets 3.

The FRP material 1 is a plate-shaped member having a thickness, and is composed of a reinforcing fiber and a matrix resin. The reinforcing fibers consist of continuous fibers oriented along the plane direction of the FRP material 1, that is, the direction orthogonal to the thickness direction Z, and for example, a laminated structure in which reinforcing fiber bundles are laminated in one direction or at different angles, or It may have the form of a woven fabric. The thickness of the FRP material 1 is not particularly limited and can be appropriately set according to the required strength, rigidity and the like. The reinforcing fiber is not particularly limited, and for example, carbon fiber, glass fiber, polyaramid fiber, alumina fiber, silicon carbide fiber, boron fiber, silicon carbide fiber and the like can be used. As the carbon fiber, for example, polyacrylonitrile (PAN type), pitch type, cellulosic type, hydrocarbon-based gas phase growth type carbon fiber, graphite fiber and the like can be used. Two or more kinds of these fibers may be used in combination. The matrix resin is not particularly limited, and is, for example, a known thermosetting resin such as an epoxy resin, a phenol resin, an unsaturated polyester resin, a vinyl ester resin, a polyimide resin, a polycarbonate resin, a polyamide resin, a polyphenylene sulfide (PPS) resin, or heat. A plastic resin can be used. Although the FRP material 1 shown in the figure is formed in a flat plate shape, the shape thereof can be appropriately selected depending on the intended use, and may be, for example, a curved plate shape.

As shown in FIG. 1B, the bracket 2 is a member for fastening the object to be fastened 4 to the FRP material 1 by means of fasteners F such as bolts B and nuts N. The bracket 2 is composed of a first bracket member 5 provided on the upper side of the FRP material 1 and a second bracket member 6 provided on the lower side of the FRP material 1.

The first bracket member 5 is made of metal such as stainless steel or aluminum, and includes a main body portion 7, a collar portion 8, and two projecting portions 9. The main body portion 7 has a substantially rectangular plate-like shape in the thickness direction, and extends along the upper surface 1a of the FRP material 1.

The collar portion 8 has a cylindrical shape and protrudes downward from the back surface 7a of the central portion of the main body portion 7 in the thickness direction view. The length of the collar portion 8, that is, the dimension along the thickness direction Z is substantially equal to the thickness of the main body portion 7 plus the thickness of the FRP material 1 and the thickness of the adhesive A provided on both sides thereof.

The collar portion 8 is provided with a through hole 8a for inserting the fastener F in the central portion. The upper end of the through hole 8a is open to the upper surface 5a of the first bracket member 5, and the lower end is open to the lower surface 8b of the collar portion 8. A hole h1 that penetrates the FRP material 1 in the thickness direction Z is provided at a position corresponding to the collar portion 8 of the FRP material 1, and the collar portion 8 is fitted into the hole h1. The shape and dimensions of the hole h1 can be determined so that the gap between the outer peripheral surface 8c of the collar portion 8 and the inner peripheral surface h1a of the hole h1 is an appropriate dimension for the adhesive A. Further, although the illustrated collar portion 8 is formed in a cylindrical shape, the shape thereof can be appropriately selected depending on the intended use, and may be, for example, a polygonal cylinder.

The protruding portions 9 are provided one by one in the vicinity of the outer edge portions of both ends in the longitudinal direction of the main body portion 7 in the thickness direction view, and are arranged so as to sandwich the collar portion 8 between them. Each protruding portion 9 has a columnar shape, and protrudes downward from the back surface 7a of the main body portion 7 at a position separated from the collar portion 8. The protruding height of the protruding portion 9, that is, the dimension along the thickness direction Z from the back surface 7a is substantially equal to the dimension obtained by subtracting the thickness of the main body portion 7 from the length of the collar portion 8.

A hole h2 that penetrates the FRP material 1 in the thickness direction Z is provided at a position corresponding to the protrusion 9 of the FRP material 1, and the protrusion 9 is fitted into the hole h2. The shape and dimensions of the hole h2 can be determined so that the gap between the outer peripheral surface 9a of the protrusion 9 and the inner peripheral surface h2a of the hole h2 is an appropriate dimension for the adhesive A. Further, although the projected portion 9 shown in the figure is formed in a columnar shape, the shape thereof can be appropriately selected depending on the intended use, and may be, for example, a prismatic shape, a plate shape, a conical shape, a pyramidal shape, or the like. ..

The second bracket member 6 is a plate-shaped member made of metal such as stainless steel or aluminum, which has a substantially rectangular shape in the thickness direction, and extends along the lower surface 1b of the FRP material 1. It exists.

A through hole 6a for inserting the fastener F is provided at a position of the second bracket member 6 facing the through hole 8a of the collar portion 8 in the thickness direction Z. The through hole 6a penetrates from the upper back surface 6b of the second bracket member 6 to the lower surface 6c and communicates with the through hole 8a of the collar portion 8.

The peripheral portion of the through hole 6a on the back surface 6b of the second bracket member 6 faces the lower surface 8b of the collar portion 8 in the thickness direction Z and is in direct contact with the lower surface 8b. Further, the portion of the back surface 6b of the second bracket member 6 located below the protruding portion 9 faces the lower surface 9b of the protruding portion 9 in the thickness direction Z and is in direct contact with the lower surface 9b.

As shown in FIG. 1B, both bracket members 5 and 6 are adhered to the FRP material 1 by the adhesive A. Specifically, the collar portion 8 is adhered to the inner peripheral surface h1a of the hole h1 by the adhesive A provided in the gap between the outer peripheral surface 8c and the inner peripheral surface h1a of the hole h1. The protruding portion 9 is adhered to the inner peripheral surface h2a of the hole h2 by the adhesive A provided in the gap between the outer peripheral surface 9a and the inner peripheral surface h2a of the hole h2. The main body 7 is adhered to the FRP material 1 by the adhesive A provided in the gap between the back surface 7a and the upper surface 1a of the FRP material 1. The second bracket member 6 is adhered to the FRP material 1 by the adhesive A provided in the gap between the back surface 6b thereof and the lower surface 1b of the FRP material 1. The adhesive A is not particularly limited, and for example, known adhesives such as epoxy-based and urethane-based adhesives can be used.

The two rivets 3 are arranged so as to sandwich the collar portion 8 between the two rivets 3 in the thickness direction view. As shown in FIG. 1A, the rivet 3 of the present embodiment has the shortest peripheral length among the innumerable surrounding lines surrounding the collar portion 8 and the protruding portion 9 (one point in FIG. 1A). It is driven into the area R surrounded by the chain line). In particular, the two rivets 3 of the present embodiment are arranged along the same straight line L as the collar portion 8 and the two protrusions 9, and the center point of the collar portion 8 and each protrusion 9 are arranged, respectively. They are arranged near the midpoint of the line segment connecting the center point.

Each rivet 3 penetrates the bracket members 5 and 6 and the FRP material 1 in the thickness direction Z, and fastens the bracket members 5 and 6 to the FRP material 1. Specifically, as shown in FIG. 1D, the bracket members 5 and 6 and the FRP material 1 sandwiched between them are driven into a hole h3 penetrating in the thickness direction Z.

The rivet 3 is a blind rivet and includes a sleeve 3a and a mandrel 3b inserted into the sleeve 3a, as shown in FIGS. 1C and 1D. The sleeve 3a includes a cylindrical body portion 3c and a flange 3d formed at the end of the body portion 3c. A head 3e having an outer diameter larger than the inner diameter of the sleeve 3a is formed in a portion of the tip of the mandrel 3b located outside the tip of the sleeve 3a.

When fastening and fixing the bracket members 5 and 6 to the FRP material 1 using the rivet 3, first, as shown in FIG. 1C, first, the sleeve 3a is inserted into the hole h3 from one side (upper side in this embodiment) of the FRP material 1. The body 3c of the body is inserted. At this time, with the seat surface 3f of the flange 3d in contact with the peripheral portion of the hole h3 of the surface 5a of the first bracket member 5, the tip portion of the body portion 3c is below the surface 6c of the second bracket member 6. Make it stick out.

In this state, the mandrel 3b is pulled upward by using a special tool (not shown) while pressing the seat surface 3f of the flange 3d against the peripheral portion of the hole h3 of the surface 5a of the first bracket member 5. Then, a compressive force is applied in the axial direction from the head portion 3e of the mandrel 3b to the body portion 3c, and the body portion 3c is uniformly compression-plastically deformed in the axial direction and has a diameter as shown in FIG. 1D. The diameter expands and deforms in the direction. Further, the portion of the tip of the body portion 3c located below the surface 6c of the second bracket member 6 is expanded radially outward by the head portion 3e of the mandrel 3b, and the bulging portion 3g is expanded. Form. Then, when the mandrel 3b is torn off, the sleeve 3a is crimped, and the bracket members 5 and 6 are fastened and fixed to the FRP material 1.

In this caulked state, the axial force of the rivet 3 acts on the bracket members 5 and 6 from the flange 3d of the rivet 3 and the swelling portion 3g. Therefore, a frictional force in the surface direction acts between the seat surface 3f of the flange 3d and the surface 5a of the first bracket member 5 in contact with the seat surface 3f. Further, a frictional force in the surface direction also acts between the upper surface 3h of the bulging portion 3g and the surface 6c of the second bracket member 6 in contact with the upper surface 3h. Then, due to these frictional forces, the relative displacement of the rivet 3 with respect to the bracket members 5 and 6 in the radial direction is prevented. This means that by keeping the axial force of the rivet 3 at an appropriate value and maintaining the frictional force at an appropriate magnitude, it is possible to prevent the relative displacement of the rivet 3 with respect to the bracket members 5 and 6 in advance. means.

Further, the outer peripheral surface 3k of the body portion 3c that has been expanded and deformed is in direct surface contact with at least the inner peripheral surface h3a of the hole h3 formed in the FRP material 1 among the inner peripheral surfaces h3a of the hole h3. More specifically, the outer peripheral surface 3k of the body portion 3c is pressed in the radial direction against the inner peripheral surface h3a of the FRP material 1 and is in close contact with the inner peripheral surface h3a. On the outer peripheral surface 3k of the body portion 3c and the inner peripheral surface h3a of the FRP material 1, there are continuous regions in the circumferential direction in which the adhesive A intervening between them does not exist or is negligibly small. .. Therefore, the rivet 3 is radially constrained by the hole h3 of the FRP material 1 and cannot be displaced relative to the FRP material 1 in the radial direction. The shape and dimensions of the hole h3 are selected so that the surface pressure of the outer peripheral surface 3k of the body portion 3c on the inner peripheral surface h3a of the FRP material 1 becomes an appropriate value in the caulked state.

In the present embodiment, the rivet 3 and the bracket 2 fastened to the FRP material 1 by the rivet 3 and the portion of the FRP material 1 sandwiched between the bracket members 5 and 6 are fastened to the FRP material 1. A fastening portion for fastening the object 4 is configured. When fastening the object to be fastened to the fastening portion, for example, as shown in FIG. 1B, the object to be fastened 4 is superposed on the first bracket member 5, and the through hole of the collar portion 8 and the second bracket member 6 is formed. A bolt B is inserted through 8a and 6a and a hole 4a of the object to be fastened 4, and a nut N is tightened therein. As a result, the object to be fastened 4 can be fastened to the FRP material 1.

Hereinafter, the action and effect of the present embodiment will be described.

(1) In the present embodiment, the protruding portion 9 protrudes downward at a position separated from the collar portion 8 and is fitted into the hole h2 of the FRP material 1. Therefore, when the first bracket member 5 is bent and deformed, a force for restraining the bending deformation acts on the first bracket member 5 from the protrusion 9, so that the resistance (flexural rigidity) of the first bracket member 5 to the bending deformation. Is larger than in the absence of the protrusion 9. Therefore, bending deformation of the first bracket member 5 due to the axial force of the rivet 3 is suppressed, and for example, the end portion of the main body portion 7 that may occur when there is no protruding portion 9 bites into the FRP material 1 (see FIG. 2). It is prevented that a local concentrated load acts on the FRP material 1 (surface pressure concentration). As a result, creep deformation (thinning) of the FRP material 1 in the thickness direction Z is suppressed, and a decrease in the axial force of the rivet 3 is prevented. Relative displacement is prevented.

On the other hand, since the creep deformation in the surface direction of the FRP material 1, that is, the orientation direction of the reinforcing fibers is significantly smaller than the creep deformation in the thickness direction Z, the creep deformation in the radial direction of the hole h3 of the FRP material 1 can be ignored. As small as it is. Further, the outer peripheral surface 3k of the body portion 3c of the rivet 3 is in surface contact with the inner peripheral surface h3a of the hole h3, and whether or not there is an adhesive intervening between the outer peripheral surface 3k and the inner peripheral surface h3a is ignored. Since it is as small as possible, the relative displacement of the rivet 3 due to the creep deformation of the adhesive hardly occurs. That is, the relative displacement of the rivet 3 and the FRP material 1 in the plane direction over time is sufficiently suppressed.

As described above, according to the present embodiment, since the FRP material 1 and the bracket members 5 and 6 are fastened by the rivet 3 in which the relative displacement in the surface direction is suppressed with respect to both, the adhesive A is creep-deformed. It is possible to suppress the relative displacement between the FRP material 1 and the bracket 2 due to the above.

(2) Further, in the present embodiment, the rivet 3 is in the region R surrounded by the encircling line having the shortest circumference among the innumerable enclosing lines surrounding the collar portion 8 and the protruding portion 9 in the thickness direction view. Has been driven into. The inner side of this region R is easier to transmit the binding force of the protruding portion 9 than the outer region, and the bending rigidity of the first bracket member 5 is high. Therefore, the bending deformation of the first bracket member 5 due to the axial force of the rivet 3 is suppressed as compared with the case where the rivet 3 is driven to the outside of the region R, and the creep deformation of the FRP material 1 in the thickness direction Z due to the concentration of surface pressure. Is suppressed. Therefore, the decrease in the axial force of the rivet 3 is more reliably prevented.

(3) Further, in the present embodiment, the collar portion 8, the protruding portion 9, and the rivet 3 are arranged along the same straight line L in the thickness direction view. Therefore, when an external force is input from the object to be fastened 4 to the bracket 2 in the direction along the straight line L, the external force can be efficiently shared and supported by the protrusion 9 and the rivet 3. Therefore, creep deformation of the adhesive A provided around the collar portion 8 can be suppressed.

(4) Further, in the present embodiment, the collar portion 8 and the protruding portion 9 of the first bracket member 5 are in contact with the metal second bracket member 6 so as to face each other in the thickness direction Z. Therefore, the first bracket member 5 can directly receive the binding force against the bending deformation from the second bracket member 6. Therefore, the bending deformation of the first bracket member 5 due to the axial force of the rivet 3 is further suppressed, and the creep deformation of the FRP material 1 in the thickness direction Z due to the concentration of surface pressure is further suppressed. Further, since a part of the axial force of the rivet 3 is directly transmitted to the second bracket via the collar portion 8 and the protruding portion 9, the surface pressure acting on the FRP material 1 from the bracket members 5 and 6 is reduced. , Creep deformation of the FRP material 1 in the thickness direction Z is further suppressed. Therefore, the decrease in the axial force of the rivet 3 is more reliably prevented.

(5) Further, in the present embodiment, since the rivet 3 is a blind rivet, the body portion 3c can be greatly expanded and deformed at the time of caulking work as compared with a normal rivet. As a result, the outer peripheral surface 3k of the body portion 3c of the rivet 3 can be more reliably brought into close contact with the inner peripheral surface h3a of the hole h3 of the FRP material 1.

(6) Further, in the present embodiment, the two rivets 3 are arranged so as to sandwich the collar portion 8 in the thickness direction view. Therefore, even when a clockwise or counterclockwise moment acts on the bracket 2 in the thickness direction, the moment can be borne by the two rivets 3 provided at positions separated from each other. As a result, the creep deformation of the adhesive A due to the moment can be prevented, and the creep displacement of the bracket 2 with respect to the FRP material 1 can be suppressed. The number of rivets 3 may be 3 or more in order to make the creep displacement more reliable.

(7) Further, the present embodiment includes two protrusions arranged so as to sandwich the collar portions 8 between each other in the thickness direction view. Therefore, the area of the region R is increased by that amount, and the degree of freedom in selecting the driving position of the rivet 3 is increased.

<Modified example of the first embodiment>
In the first embodiment, two projecting portions 9 are provided so as to sandwich the collar portion 8 between them in the thickness direction view, but one of them (for example, the left side of the collar portion 8 in FIG. 1A) is provided. The protruding portion 9 of the above may be omitted. Further, two rivets 3 were also arranged so as to sandwich the collar portion 8 between them in the thickness direction view, but the same side as the omitted protrusion 9 (for example, the collar portion 8 in FIG. 1A). The rivet 3 on the left side) may be omitted. In this case, at least the above-mentioned effects (1) to (5) can be obtained from the configuration including the remaining side protrusion 9, the rivet 3, and the collar portion 8 (the portion surrounded by the alternate long and short dash line in FIG. 1A). Obtainable. Further, also in other embodiments described below, those including the same configuration can obtain the same action and effect.

Next, the bracket mounting structure according to the second to sixth embodiments and the other embodiments will be described with reference to FIGS. 3 to 9. In the description of each embodiment, only the configurations different from the preceding embodiments and modifications will be described, and the same reference numerals are given to the elements having the same functions as the elements already described in the preceding embodiments and the like. Therefore, the description thereof will be omitted.

In each embodiment described later, holes h1, h2, h3 are formed in the FRP material 1 corresponding to the collar portion 8, the protrusion 9, and the rivet 3, respectively, and the through holes 8a and the rivets of the collar portion 8 are formed. A through hole 6a and a hole h3 are formed in the second bracket member 6 corresponding to each of the three. Since the configurations of the holes h1, h2, h3 and the through holes 6a are the same as the configurations of the holes h1, h2, h3 and the through holes 6a in the first embodiment, illustration and description thereof will be omitted.

<Second Embodiment>
In the second embodiment, the first bracket member 5 includes four protrusions 9. As shown in FIG. 3, two of the four projecting portions 9 are arranged on each side so as to sandwich the collar portion 8 in the thickness direction view. Each protruding portion 9 is provided at a corner portion of the main body portion 7 having a substantially rectangular shape in the thickness direction, and at a position separated from each other and separated from the collar portion 8, from the back surface 7a of the main body portion 7 to the lower side. It stands out. Further, as shown in FIG. 3, the peripheral length is the shortest among the innumerable surrounding lines surrounding the collar portion 8 and the two protruding portions 9 located on the same side of the collar portion 8 in the thickness direction view. The region R surrounded by the surrounding line (one-dot chain line in FIG. 3) is wider than the region R of the modified example of the first embodiment.

(8) According to the present embodiment, since the first bracket member 5 has two protrusions 9 on one side (on the same side as the collar portion 8), the protrusions 9 with respect to bending deformation of the main body 7 are provided. The binding force of 9 is increased, and the bending rigidity of the first bracket member 5 is further improved.

(9) Further, since the region R of the present embodiment is wider than the region R of the modified example of the first embodiment, the degree of freedom of the position where the rivet 3 is driven is high, and the action and effect of the above (2) can be more reliably performed. Obtainable.

<Modified example of the second embodiment>
In the second embodiment, four projecting portions 9 are provided, which are arranged two on each side so as to sandwich the collar portion 8 in the thickness direction view, of which one side (for example, the collar portion 8 in FIG. 3) is provided. The two protrusions 9 on the left side) may be omitted. Further, the rivets 3 were also arranged one on each side so as to sandwich the collar portions 8 between each other in the thickness direction view, but the same side as the two omitted protrusions 9 (for example, the collar in FIG. 3). The rivet 3 (on the left side of the part 8) may be omitted. In this case, from the configuration including the two protruding portions 9 and the rivet 3 and the collar portion 8 on the remaining side (the portion surrounded by the alternate long and short dash line in FIG. 3), at least the actions of (8) and (9) above. The effect can be obtained.

In addition, three or more protruding portions 9 may be provided on the same side with respect to the collar portion 8 in the thickness direction view. In this case, the restraining force of the protruding portion 9 with respect to the bending deformation of the main body portion 7 is further increased, and the bending rigidity of the first bracket member 5 is further improved.

<Third Embodiment>
In the third embodiment, as shown in FIG. 4, the first bracket member 5 includes two collar portions 8 and one projecting portion 9. In the thickness direction view, the center point of the protrusion 9 and the center points of the two color portions 8 are located at positions corresponding to the vertices of the triangle. The main body 7 of the first bracket member 5 and the second bracket member 6 (not shown) have a substantially triangular shape in the thickness direction. The rivet 3 is inside the region R surrounded by the shortest peripheral length (dotted chain line in FIG. 4) among the innumerable surrounding lines surrounding the two collar portions 8 and the protruding portions 9 in the thickness direction. Then, it is driven into the position of the center of gravity of the above triangle. The third embodiment corresponds to one in which one of the two protruding portions 9 in the modified example of the second embodiment is replaced with the collar portion 8.

(10) According to the present embodiment, by providing the collar portion 8 instead of the protrusion 9, the number of the protrusions 9 can be reduced, and the bending rigidity of the first bracket member 5 can be improved by the collar portion 8. can.

<Fourth Embodiment>
In the fourth embodiment, as shown in FIG. 5, the first bracket member 5 includes three collar portions 8. The fourth embodiment corresponds to the one in which the protruding portion 9 in the third embodiment is replaced with the collar portion 8.

(11) According to the fourth embodiment, the protruding portion 9 of the first bracket member 5 can be omitted.

<Fifth Embodiment>
In the fifth embodiment, as shown in FIG. 6, the first bracket member 5 includes two collar portions 8, and the rivet 3 is near the midpoint of the line segment connecting the centers of the two collar portions 8. Has been driven into. The fifth embodiment corresponds to the one in which the protruding portion 9 in the modified example of the first embodiment is replaced with the collar portion 8, or the one in which the protruding portion 9 is omitted from the third embodiment.

(12) According to the fifth embodiment, the protrusion 9 can be omitted in the first bracket member 5 as in the fourth embodiment. Further, since the axial force of the rivet 3 can be supported by the two collar portions having a geometrical moment of inertia larger than that of the protruding portion 9, the first bracket member 5 can obtain higher bending rigidity than the modified example of the first embodiment. can.

<Modified example of the fifth embodiment>
In the fifth embodiment, the protruding portion 9 is omitted and one rivet 3 is driven between the two collar portions 8, but as shown in FIG. 7, one of the two collar portions 8 is sandwiched between them. You may drive two rivets 3 so as to sandwich them. This modification corresponds to the one in which one of the two protruding portions 9 is replaced with the collar portion 8 in the first embodiment. According to this modification, the creep displacement of the bracket 2 with respect to the FRP material 1 can be suppressed when a clockwise or counterclockwise moment acts on the bracket 2 in the thickness direction as in the first embodiment (. See the action and effect of (6) above).

<Sixth Embodiment>
As shown in FIG. 8, the sixth embodiment corresponds to the one in which two through holes 8a are formed in the collar portion 8 in the first embodiment. The collar portion 8 of the present embodiment has a shape in which two circles circumscribing each other are connected by the external contact in the thickness direction view. The external dimensions of the collar portion 8 in the thickness direction view are larger than those of the collar portion 8 having one through hole 8a. Therefore, the hole h1 for mounting the collar portion 8 is formed to be larger by that amount. Although not shown, the second bracket member 6 is provided with two through holes 6a at positions corresponding to the two through holes 8a of the collar portion 8.

(13) In the sixth embodiment, since one collar portion 8 has two through holes 8a, the distance between the through holes 8a can be reduced, and the positions of the fasteners F are close to each other. Suitable. Further, since the external dimension of the collar portion 8 in the thickness direction is larger than that of the collar portion 8 having one through hole 8a, the bending rigidity of the first bracket member 5 is improved.

<Modified example of the sixth embodiment>
In the sixth embodiment, two through holes 8a are formed in one collar portion 8, but the number of through holes 8a is not limited to this, and may be three or more. Further, the configuration in which one collar portion 8 is provided with a plurality of through holes 8a can be applied to any one or more of the above embodiments and modifications other than the sixth embodiment. In these modified examples, at least the same action and effect as the above-mentioned action and effect (13) can be obtained.

<Other embodiments>
In another embodiment, a normal rivet may be adopted as the rivet 3 in place of or in addition to the blind rivet. In a normal rivet, if the body portion 3c can be expanded and deformed by caulking work, and the outer peripheral surface 3k thereof can be brought into surface contact with the inner peripheral surface h3a of the hole h3 of the FRP material 1 at an appropriate surface pressure. , Not particularly limited.

In another embodiment, as shown in FIG. 9, the upper surface of the flange 3d of the rivet 3 can be formed flat and the seat surface 3f can be formed in a conical shape. By doing so, even if the surface of the object to be fastened 4 facing the bracket 2 is a flat surface, the object to be fastened 4 can be fastened without interfering with the rivet 3 on the flat surface. The degree of freedom is improved.

In yet another embodiment, the hole h2 does not have to penetrate the FRP material 1 in the thickness direction Z, and the protruding height of the protruding portion 9 may be smaller than the thickness of the FRP material 1. Even in this case, the second bracket member 6 to the first bracket member 5 are restrained from bending deformation via the FRP material 1 interposed between the lower surface 9b of the protrusion 9 and the back surface 6b of the second bracket member 6. Power is transmitted. Therefore, bending deformation of the first bracket member 5 due to the axial force of the rivet 3 is suppressed, and a decrease in the axial force of the rivet 3 is prevented.

Yet another embodiment is a combination of two or more embodiments selected from the above embodiments (including variations thereof). In the embodiment relating to these combinations, each effect of the embodiment corresponding to each of the combined elements can be obtained.

The above embodiments and modifications are merely examples described for facilitating the understanding of the invention. The technical scope of the invention is not limited to the specific technical matters disclosed in the above-described embodiments and modifications, but also includes various modifications, modifications, and alternative techniques that can be easily derived from the specific technical matters.

The bracket mounting structure according to the above-described embodiment and modification is used for fastening portions of FRP material 1 constituting a vehicle such as an automobile such as a hood, a door panel, a bumper, a trunk lid, a rear gate, a fender panel, a side body panel, and a roof panel. can do. In addition, the bracket mounting structure can be used for fastening parts of FRP materials constituting transport machines such as aircraft, ships, and railroad vehicles, household electric products, power generation equipment, production machines, housing equipment, furniture, leisure goods, and the like. ..

1 FRP material 2 Bracket 5 1st bracket member 6 2nd bracket member 7 Main body 8 Color part (1st color part, 2nd color part, 3rd color part)
8a Through hole 9 Protruding part (first protruding part, second protruding part)
3 Rivet 3c Body 3k Outer peripheral surface h2 Hole in which the protrusion is fitted h3 Hole through which the rivet penetrates h3a Inner peripheral surface 4 Fastener F Fastener R Area surrounded by the shortest peripheral line Z Thickness direction L straight line

Claims (10)

A bracket for fastening the object to be fastened to the FRP material with a fastener, and a first metal bracket member provided on one side of the FRP material in the thickness direction and adhered to the FRP material. A metal second bracket member provided on the other side of the FRP material in the thickness direction and adhered to the FRP material, and a metal second bracket member.
A rivet that penetrates the first and second bracket members and the FRP material in the thickness direction and fastens the first and second bracket members to the FRP material.
Equipped with
The first bracket member is
A first collar portion having a through hole for inserting the fastener, and
A first protruding portion that protrudes to the other side in the thickness direction at a position separated from the first collar portion and is fitted into a hole provided in the FRP material.
Equipped with
The outer peripheral surface of the body of the rivet is in surface contact with the inner peripheral surface of the hole through which the rivet penetrates in the FRP material .
The rivet is a bracket mounting structure to the FRP material, which is driven into a region surrounded by the shortest surrounding line surrounding the first collar portion and the first protruding portion in the thickness direction . The bracket mounting structure to the FRP material according to claim 1 , wherein the first collar portion, the first protruding portion, and the rivet are arranged along the same straight line in the thickness direction view. The first bracket member protrudes to the other side in the thickness direction at a position separated from the first collar portion and the first protruding portion, and the second protruding portion is fitted into a hole provided in the FRP material. The bracket mounting structure to the FRP material according to claim 1. 3. The rivet is driven into a region surrounded by the shortest surrounding line surrounding the first collar portion, the first protruding portion, and the second protruding portion in the thickness direction. Bracket mounting structure to FRP material described in. The bracket mounting structure to the FRP material according to claim 4 , wherein the second protruding portion is a second collar portion having a through hole for inserting the fastener. The bracket mounting structure to the FRP material according to any one of claims 1 , 2, and 5, wherein the first protruding portion is a third collar portion having a through hole for inserting the fastener. The bracket mounting structure to the FRP material according to any one of claims 1 to 6 , wherein at least the first collar portion is provided with a plurality of the through holes. The bracket mounting structure for an FRP material according to any one of claims 1 to 7 , wherein a plurality of the rivets are provided at positions separated from each other. The FRP material according to any one of claims 1 to 8 , wherein at least the first collar portion and the first protruding portion are in contact with the second bracket member so as to face each other in the thickness direction. Bracket mounting structure. The bracket mounting structure to the FRP material according to any one of claims 1 to 9 , wherein the rivet is a blind rivet.

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