JP2020104308A - Fiber-reinforced resin body - Google Patents

Abstract

To provide a fiber-reinforced resin body capable of preventing breakage of a fiber layer existing in an outer peripheral part of a hole part even under a stress that is enlarged by stress concentration generated in the outer peripheral part, in a case in which force is applied to the fiber-reinforced resin body.SOLUTION: The fiber-reinforced resin body 10 of this invention includes plural stacked fiber layers 13a to 13h. The fiber layer 13a, or the like, which is part of the fiber layers, includes a first through hole 11a that penetrates in a direction of the stacking formed so as to cut off oriented main fiber bundles 14a to 14d. Other fiber layers 13c, etc. include a large diameter part 17 and reinforcement parts 12 to be disposed to be fitted in the large diameter part 17. The reinforcement parts 12 include a second through hole 11b that penetrates the reinforcement parts 12. The first through hole 11a and the second through hole 11b communicate with each other and form one hole part 11 into which mechanical fastening means 7 is inserted. The reinforcement parts 12 include a wound-like oriented fiber bundle 14e so as to wind around a central axis of the second through hole 11b.SELECTED DRAWING: Figure 1B

Description

The present invention relates to a fiber reinforced resin body used as a structural member incorporated in, for example, a vehicle or a machine tool.

2. Description of the Related Art In recent years, fiber reinforced plastics (FRP) have been used as structural members constituting, for example, vehicles because they satisfy requirements such as excellent mechanical properties and weight reduction. When a fiber-reinforced resin body made of such a fiber-reinforced resin is attached to another member as a structural member, mechanical fastening means (connecting member, mechanical coupling element) such as a bolt is inserted into the fiber-reinforced resin body. It is necessary to provide the hole part of.

For example, Patent Document 1 describes a method of forming through holes in a fiber-reinforced resin sheet by scraping the fibers of the fiber-reinforced resin sheet.

JP, 2008-290269, A

As described in Patent Document 1, by separating the fiber bundles that form the fiber layer, the holes can be formed without cutting the fibers of the fiber-reinforced resin body. However, in the method of forming the through hole of Patent Document 1, since the fibers are spread while being stretched along the periphery of the hole, it is not possible to form the hole having a size exceeding the expansion and contraction limit of the fiber. However, it may not be possible to form a hole having a desired diameter at a desired position. Further, even if the holes can be formed in the fiber-reinforced resin body, the fiber density around the holes becomes high, so that the thickness of the fiber layer at the outer periphery of the holes becomes thicker than the fiber layers at other parts. Therefore, there is a possibility that a problem may occur such that the connection between the fiber-reinforced resin body and other members is hindered. In addition, since the fiber density of the outer peripheral portion of the hole becomes high, for example, a resin impregnation step of pouring the resin into the cavity of the mold into which the shaped fiber body is charged to impregnate the fiber body, and then When a fiber reinforced resin body is to be formed by resin transfer molding (RTM) or infusion molding, which includes a resin solidifying step of solidifying the resin, the resin is formed on the outer peripheral portion of the hole in the resin impregnating step. There is also a problem that it is difficult to be impregnated with the particles and defects such as voids (holes) are likely to occur.

As a method of forming the holes in the fiber-reinforced resin body that solves the problem of Patent Document 1, a method of cutting the fiber bundles forming the fiber layer to form the holes can be considered. However, in addition to the tightening force of bolts, etc., a static or shocking force is externally input to the fiber reinforced resin body from the outside of the hole, and stress such as tension or compression concentrates at the outside of the hole. .. When the hole is formed by cutting the fiber bundle as described above, the strength of the fiber layer in the outer peripheral portion of the hole is reduced, so that the stress expanded due to the stress concentration is the outer peripheral portion of the hole having low strength. There is a possibility that the fiber reinforced resin body may be damaged due to the action on the fiber layer of 1.

The present invention has been made in view of such a problem, having a plurality of laminated fiber layers, a fiber reinforced resin body in which a hole into which a mechanical fastening means is inserted is formed, The plurality of fiber layers include oriented fiber bundles, and the holes penetrate the plurality of fiber layers in the stacking direction to cut the fiber bundles. In, when a force is input to the fiber reinforced resin body, even under stress expanded due to stress concentration generated in the outer peripheral portion of the hole, it is possible to prevent damage to the fiber layer existing in the outer peripheral portion. An object is to provide a fiber-reinforced resin body.

The following is a brief description of the outline of the typical invention disclosed in the present application.

[1] The fiber-reinforced resin body is a fiber-reinforced resin body having a plurality of laminated fiber layers, and the plurality of fiber layers include oriented main fiber bundles. Some of the plurality of fiber layers have a first through hole that is formed so as to cut the main fiber bundle by penetrating in the laminating direction, At least one fiber layer of the other fiber layers excluding the fiber layer is fitted to the large diameter hole portion having a larger diameter than the first through hole and the inner circumference of the large diameter hole portion. It has a reinforcing part arranged. The reinforcing portion has a second through hole that penetrates the reinforcing portion. The first through hole formed in the part of the fiber layer and the second through hole formed in the reinforcing portion communicate with each other to form one hole portion, and the hole portion is a mechanical fastening means. Is configured to be insertable. The reinforcing portion includes a fiber bundle that is oriented so as to be wound around the central axis of the second through hole (hereinafter, this fiber bundle may be referred to as a wound fiber bundle).

[2] In the fiber-reinforced resin body according to [1], the reinforcing portion is replaced with a fiber bundle that is oriented so as to be wound around the central axis of the second through hole, and from the center of the second through hole. It may include a fiber bundle that is radially oriented (hereinafter, this fiber bundle may be referred to as a radial fiber bundle).

[3] In the fiber-reinforced resin body according to [1], the reinforcing portion further includes the radial fiber bundle.

[4] In the fiber-reinforced resin body according to [3], the reinforcing portion includes a first reinforcing portion made of the wound fiber bundle and a second reinforcing portion made of the radial fiber bundle. The fiber layer includes a fiber layer in which the first reinforcing portion is arranged and a fiber layer in which the second reinforcing portion is arranged.

[5] In the fiber-reinforced resin body according to [4], the first reinforcing portion and the second reinforcing portion are adjacent to each other in the stacking direction.

[6] In the fiber-reinforced resin body according to [4], the radial fiber bundle is substantially orthogonal to a tangent line of the wound fiber bundle at an intersection with the wound fiber bundle in a plan view.

[7] In the fiber-reinforced resin body according to any one of [1] to [6], fiber bundles aligned in a direction along a main axis of shear stress among stresses acting on the holes in a plan view. A first fiber layer having a first fiber layer, a second fiber layer having a fiber bundle aligned in a direction substantially orthogonal to the fiber bundle of the first fiber layer, the first fiber layer and the second fiber layer. A third fiber layer having fiber bundles aligned in a direction intersecting with any fiber bundle, and any fiber bundles included in the first fiber layer, the second fiber layer and the third fiber layer. The fourth fiber layer having the fiber bundles aligned in the intersecting direction is laminated.

[8] In the fiber-reinforced resin body according to any one of [4] to [6], fiber bundles aligned in a direction along a main axis of shear stress of stress acting on the hole in plan view. A first fiber layer having a first fiber layer, a second fiber layer having a fiber bundle aligned in a direction substantially orthogonal to the fiber bundle of the first fiber layer, the first fiber layer and the second fiber layer. A third fiber layer having fiber bundles aligned in a direction intersecting with any fiber bundle, and any fiber bundles included in the first fiber layer, the second fiber layer and the third fiber layer. A fourth fiber layer having fiber bundles aligned in a direction intersecting with each other is laminated, the first fiber layer includes the first reinforcing portion, and the second fiber layer includes the second fiber layer. Includes reinforcement.

[9] In the fiber-reinforced resin body according to any one of [7] and [8], the first fiber layer and the second fiber layer are adjacent to each other in the stacking direction, and the third fiber layer The fiber layer and the fourth fiber layer are adjacent to each other in the stacking direction.

[10] In the fiber-reinforced resin body according to any one of [7] to [9], the third fiber layer and the fourth fiber layer are arranged on the surface of the fiber-reinforced resin body. There is.

[11] In the fiber-reinforced resin body according to any one of [1] to [10], the outer peripheral portion of the hole has two or more fiber layers among the plurality of fiber layers. , A connecting thread sewn in the laminating direction is provided, and the connecting thread is configured such that the main fiber bundle contained in the part of the fiber layers and/or the fiber bundle contained in the reinforcing portion is arranged in the laminating direction. They are bundled and fixed.

[12] In the fiber-reinforced resin body according to any one of [3] to [10], the outer peripheral portion of the hole has two or more fiber layers among the plurality of fiber layers. A connecting thread sewn in the stacking direction is provided, and the connecting thread bundles and fixes the wound fiber bundle and the radial fiber bundle in the stacking direction.

[13] In the fiber-reinforced resin body according to any one of [11] and [12], a part of the connecting yarn is arranged along a surface of the fiber-reinforced resin body, and in plan view. , Are arranged so as to overlap the reinforcing portion.

[14] In the fiber-reinforced resin body according to any one of [1] to [13], the reinforcing portion is not exposed on the surface of the fiber-reinforced resin body.

[15] In the fiber-reinforced resin body according to any one of [1] to [14], the reinforcing portion is arranged along a part of a peripheral edge of the hole portion in a plan view.

[16] In the fiber-reinforced resin body according to any one of [1] to [14], the reinforcing portion is arranged over the entire circumference of the peripheral edge of the hole portion in a plan view.

[17] In the fiber-reinforced resin body according to [3], the reinforcing portion is formed by braiding the wound fiber bundle and the radial fiber bundle.

According to the present invention, there is provided a fiber-reinforced resin body having a plurality of laminated fiber layers and having a hole into which a mechanical fastening means is inserted, wherein the plurality of fiber layers are oriented fibers. In the fiber-reinforced resin body that includes a bundle, the hole portion penetrates the plurality of fiber layers in the stacking direction, and cuts the fiber bundle, a force is input to the fiber-reinforced resin body. In such a case, it is possible to provide a fiber-reinforced resin body capable of preventing damage to the fiber layer existing in the outer peripheral portion even under stress expanded by the stress concentration generated in the outer peripheral portion.

It is a top view which shows the fiber reinforced resin body of 1st Embodiment. FIG. 1B is a main-portion cross-sectional view showing the structure cut along the line A-A′ in FIG. 1A. FIG. 2 is a cross-sectional view of main parts showing a structure cut along line B-B′ in FIG. 1B. FIG. 2 is a cross-sectional view of relevant parts showing a structure cut along line C-C′ in FIG. 1B. The top view which shows each member which comprises the fiber reinforced resin body which concerns on 1st Embodiment. It is an important section sectional view showing a manufacturing process of a fiber reinforced resin object concerning a 1st embodiment. It is a top view which shows the wheel for vehicles which is an application example of the fiber reinforced resin body which concerns on 1st Embodiment. 4B is a side view of the vehicle wheel of FIG. 4A. FIG. FIG. 4B is an enlarged sectional view taken along the line AA of FIG. 4B. It is a principal part expanded sectional view of the H section of FIG. 4C. It is a principal part sectional view which shows the structure cut|disconnected in the position corresponding to the A-A' line of FIG. 1A in the fiber reinforced resin body of the 1st modification of 1st Embodiment. FIG. 5B is a sectional view of a key portion showing the structure taken along the line B-B′ of FIG. 5A. FIG. 5B is a sectional view of a key portion showing the structure taken along the line C-C′ of FIG. 5A. It is a top view which shows the fiber reinforced resin body of the 2nd modification of 1st Embodiment. FIG. 6B is a sectional view of a key portion showing the structure taken along the line A-A′ of FIG. 6A. It is a top view which shows the fiber reinforced resin body of 2nd Embodiment. FIG. 7B is a sectional view of a key portion showing the structure taken along the line A-A′ of FIG. 7A. FIG. 8 is a cross-sectional view of main parts showing a structure taken along line B-B′ of FIG. 7B. FIG. 9 is a cross-sectional view of a main part showing a structure taken along line C-C′ of FIG. 7B. It is a principal part sectional view which shows the structure cut|disconnected in the position corresponding to the A-A' line of FIG. 1A in the fiber reinforced resin body of 3rd Embodiment. FIG. 8B is a sectional view of a key portion showing the structure taken along the line B-B′ of FIG. 8A. It is a principal part sectional view which shows the structure cut|disconnected along the C-C' line of FIG. 8A. It is a top view which shows the fiber reinforced resin body of 4th Embodiment. It is a bottom view which shows the fiber reinforced resin body of 4th Embodiment. 9A and 9B are cross-sectional views of relevant parts showing a structure taken along line A-A′ of FIGS. 9A and 9B. It is a mimetic diagram of a shear strength test to a test piece which has composition of a fiber reinforced resin object of a 1st embodiment. It is a graph which shows the result of the shear strength test with respect to the test piece which has the structure of the fiber reinforced resin body of 1st Embodiment. It is a mimetic diagram of a punching shear strength test to a test piece which has composition of a fiber reinforced resin object of a 1st embodiment. It is a graph which shows the result of the punching shear strength test with respect to the test piece which has the structure of the fiber reinforced resin body of 1st Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter, sometimes referred to as a first mode; the same applies to other embodiments) will be described with reference to the drawings. In each drawing showing each embodiment, the same or similar parts or components are shown by the same or similar symbols or reference numerals, and the description will not be repeated in principle.

<Structure of Fiber Reinforced Resin Body of First Aspect and Its Effect>
The configuration of the fiber-reinforced resin body of the first aspect will be described below. FIG. 1A is a plan view showing a fiber-reinforced resin body according to a first aspect, and FIG. 1B is a view showing a structure cut along the line AA′ in FIG. 1A in the fiber-reinforced resin body according to the first aspect. FIG. 1C is a cross-sectional view of an essential part showing a structure of the fiber-reinforced resin body according to the first aspect taken along line BB′ of FIG. 1B, and FIG. 1D shows the fiber-reinforced resin body according to the first aspect. FIG. 2B is a cross-sectional view of a main portion showing the structure cut along the line CC′ of FIG. 1B.

As shown in FIGS. 1A to 1D, the fiber-reinforced resin body 10 according to the first aspect includes eight laminated (plural) fiber layers 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h and resin. Have 15. Hereinafter, the stacking direction of the eight fiber layers 13a to 13h coincides with the thickness direction of the fiber-reinforced resin body 10. The fiber layers 13a to 13h include main fiber bundles 14a, 14b, 14c, and 14d that are oriented (aligned) in a predetermined direction. Then, the resin 15 forming the matrix of the fiber-reinforced resin body 10 is impregnated between the main fiber bundles 14a to 14d forming the fiber layers 13a to 13h and the fiber bundles 14e and 14f arranged in the reinforcing portion 12 described later. Exists in the state of being. In addition, the "main fiber bundle" means a fiber bundle included in the fiber layers 13a to 13h other than the reinforcing portion 12 described later, that is, a fiber bundle mainly constituting the fiber-reinforced resin body 10. Point to.

In the fiber-reinforced resin body 10 according to the first aspect, among the eight fiber layers 13a to 13h, some of the fiber layers 13a, 13b, 13g, and 13h (hereinafter referred to as “the upper surface and the lower surface”) are arranged. , A part of the fiber layers 13a, etc.) has a first through hole 11a formed so as to penetrate in the stacking direction and cut the main fiber bundles 14a, 14b. Further, the other fiber layers 13c to 13f (hereinafter also referred to as other fiber layers 13c and the like) obtained by removing the above-mentioned part of the fiber layers 13a and the like from the eight fiber layers 13a to 13h are the first penetrations. It has a large-diameter hole portion 17 having a diameter larger than that of the hole 11a and a reinforcing portion 12 arranged so as to be fitted into the large-diameter hole portion 17. The reinforcing portion 12 has a second through hole 11b penetrating the reinforcing portion 12, preferably having the same diameter as the first through hole 11a. In addition, in this embodiment, all of the other fiber layers 13c to 13f have the large-diameter hole portion 17 and the reinforcing portion 12, but at least one fiber layer such as the other fiber layer 13c has a large-diameter hole portion. It is sufficient to have 17 and the reinforcing portion 12.

The first through holes 11a formed in the part of the fiber layers 13a and the like and the second through holes 11b formed in the reinforcing portion 12 communicate with each other to form one hole portion 11, and the hole portion 11 is formed. Is configured so that the mechanical fastening means 7 can be inserted. Specifically, for example, when the fiber reinforced resin body 10 is adopted for the rim portion 5 of the vehicle wheel 1 shown in FIGS. 4A to 4D described later, the rim portion 5 is provided in the hole 11 of the fiber reinforced resin body 10. A mechanical fastening means (bolt) 7 for connecting the disk portion 3 and the disk portion 3 is inserted.

The reinforcing portion 12 includes a wound fiber bundle 14e oriented so as to be wound around the central axis of the second through hole 11b. Further, the reinforcing portion 12 of the first aspect, which is a preferable mode, also includes the radial fiber bundle 14f radially oriented from the center of the second through hole 11b. As will be described in detail below, since the wound fiber bundle 14e has an effect against shear failure and the radial fiber bundle 14f has an effect against punching failure, the reinforcing portion 12 need not include both. Alternatively, either one may be included. The wound fiber bundle 14e may be a fiber bundle that is oriented so as to be wound around the central axis of the second through hole 11b. As shown in FIG. 1C, the fiber bundle may be a fiber bundle wound concentrically, or may be a fiber bundle wound in a spiral shape, for example.

In the first aspect, by adopting the configuration as described above, even when force is input to the fiber-reinforced resin body 10 and stress concentration occurs in the outer peripheral portion of the hole portion 11, the outer peripheral portion of the hole portion 11 is not affected. It is possible to suppress breakage of a part of the existing fiber layers 13a and the like, and increase the breaking strength of the fiber-reinforced resin body 10. The reason will be specifically described below.

As described above, in the fiber-reinforced resin body having holes, when a force is applied to the fiber-reinforced resin body, stress concentrates on the outer peripheral portion of the formed holes. Then, when the holes are formed so as to cut the main fiber bundles 14a to 14d included in all the fiber layers 13a to 13h, the stresses expanded by the stress concentration are increased in the fiber layers 13a to 13h existing in the outer periphery of the holes. Underneath, delamination between fiber layers is likely to occur. When the delamination of the fiber layers 13a to 13h occurs, even if it is a part of the fiber layers, the burden on the peeled fiber layer becomes large, and the main fiber bundles 14a to 14d forming the fiber layer are broken. It tends to occur. Then, the delamination of the fiber layer and the breakage of the main fiber bundle proceed to the entire fiber reinforced resin body so that the fiber reinforced resin body is broken.

When the mechanical fastening means is inserted through the hole, the mechanical fastening means may come into contact with the inner wall of the hole when a force is applied to the fiber-reinforced resin body. Here, since the ends of the cut main fiber bundles 14a to 14d face the inner wall of the hole, stress acts on the ends of the main fiber bundles 14a to 14d through the mechanical fastening means. The fiber buckling of the main fiber bundles 14a to 14d is likely to occur. As described above, when the mechanical fastening means is inserted in the hole, the delamination may occur in the fiber layers 13a to 13h in which the hole is provided due to the surface pressure breakdown due to the fiber buckling. Will increase.

On the other hand, as shown in FIGS. 1A to 1D, the fiber-reinforced resin body 10 of the first aspect has a characteristic configuration in which some of the plurality of fiber layers 13a to 13h are , Having a first through hole 11a formed so as to penetrate through the stacking direction and cut the main fiber bundles 14a and 14b, and the other fiber layers 13c and the like have a larger diameter than the first through hole 11a. The large-diameter hole 17 and the reinforcing portion 12 arranged so as to be fitted to the inner circumference of the large-diameter hole 17. The reinforcing portion 12 has a second through hole 11b that forms the hole portion 11 by communicating with the first through hole 11a, and is wound around the central axis of the second through hole 11b. It includes an oriented fiber bundle (wound fiber bundle) 14e.

Since the fiber-reinforced resin body 10 of the first aspect has the characteristic configuration as described above, the reinforcing portion 12 cuts the main fiber bundles 14a and 14b such as some of the fiber layers 13a in a plan view. The positional relationship is such that the outer peripheral portion of the thus formed first through hole 11a is reinforced. Since the reinforcing portion 12 includes the wound fiber bundle 14e, the wound fiber bundle 14e included in the reinforcing portion 12 bears the shear stress acting in the in-plane (plane) direction, and Since the burden on some of the fiber layers 13a existing on the outer peripheral portion of the through hole 11a is reduced, delamination of some of the fiber layers 13a and the like is suppressed, and destruction of the fiber-reinforced resin body 10 can be prevented. it can.

In addition, in addition, in the fiber-reinforced resin body 10 of the first aspect, the reinforcing portion 12 has the radial fiber bundle 14f. By doing so, the strength against the stress (punching shear stress) generated by the punching force acting from the out-of-plane (thickness) direction can be increased. That is, when the mechanical fastening means 7 is inserted into the hole 11, when the force is input to the fiber reinforced resin body 10, the force may act in the laminating direction of the fiber layers 13a to 13h. Specifically, when the mechanical fastening means 7 is a bolt and a force is input to the fiber reinforced resin body 10 in the direction along the central axis of the bolt, the bolt is applied in the stacking direction of the fiber layers 13a to 13h. The biting may cause punching shear failure in which the fiber layer breaks like punching.

In this respect, in the fiber-reinforced resin body 10 of the first aspect, the reinforcing portion 12 includes not only the wound fiber bundle 14e but also the radial fiber bundle 14f, and the radial fiber bundle 14f is resistant to punching shear fracture. High strength. Thereby, in the fiber-reinforced resin body 10 of the first aspect, the punching shear stress is borne by the radial fiber bundles 14f, so that damage to some of the fiber layers 13a and the like can be suppressed.

Furthermore, since the reinforcing portion 12 includes both the wound fiber bundle 14e and the radial fiber bundle 14f, even if a complex multi-directional stress acts on the outer peripheral portion of the hole 11, the reinforcing portion 12 reinforces the stress. By the burden of the portion 12, it is possible to achieve a combined effect that the effect of suppressing damage to a part of the fiber layer 13a in the outer peripheral portion of the first through hole 11a formed by cutting the main fiber bundles 14a and 14b is enhanced. ..

As described above, the reinforcing portion 12 of the first aspect has a composite effect that acts on the outer peripheral portion of the hole 11 as a composite effect of the wound fiber bundle 14e and the radial fiber bundle 14f that the reinforcement portion 12 has. In addition to bearing stress from various directions, the wound fiber bundle 14e and the radial fiber bundle 14f mainly bear the shear stress acting in the plane by the former and the punching shear stress acting from the outside by the latter. It is possible to achieve the individual effect of each burden.

In addition, in order to enhance the composite action effect of the above-described wound fiber bundle 14e and the radial fiber bundle 14f, the radial fiber bundle 14f is the winding at the intersection of the wound fiber bundle 14e in plan view. It is desirable that they are substantially orthogonal to the tangent line of the convoluted fiber bundle 14e. The “plan view” refers to a visual field that is visually recognized when the fiber-reinforced resin body 10 is viewed from the direction along the central axis of the hole 11.

<Layered structure of the first aspect>
Hereinafter, the fiber-reinforced resin body 10 according to the first aspect will be described in more detail. In the laminated structure of the eight fiber layers 13a to 13h of the fiber reinforced resin body 10 of the first aspect which is a preferred embodiment, each of the fiber layers 13a to 13h has a different fiber bundle orientation pattern (orientation angle). This is a structure in which seed fiber layers are laminated (hereinafter, this laminated structure may be referred to as a different orientation fiber layer laminated structure). In addition, the orientation pattern of the fiber bundle of each fiber layer which comprises a different orientation fiber layer laminated structure should just be 3 or more types. And the laminated structure of this embodiment is a pseudo-isotropic laminated structure which is the most preferable aspect among the different orientation fiber layer laminated structures. That is, the fiber-reinforced resin body 10 is in the direction along the tensile direction shown in FIG. 1A (the shear axis direction is the stress acting on the hole 11 and this direction (orientation angle) is defined as the 0° direction). Fiber layers (hereinafter sometimes referred to as first fiber layers) 13c and 13f including aligned (orientated) main fiber bundles (hereinafter sometimes referred to as 0° fiber bundles) 14c, and first fibers The main fiber bundle (hereinafter sometimes referred to as 90° fiber bundle) 14d aligned in a direction (90° direction shown in FIG. 1A) substantially orthogonal to the 0° fiber bundle 14c included in the layers 13c and 13f is included. It has fiber layers (hereinafter sometimes referred to as a second fiber layer) 13d and 13e.

Further, the fiber-reinforced resin body 10 is in a direction intersecting with both the 0° fiber bundle 14c included in the first fiber layers 13c and 13f and the 90° fiber bundle 14d included in the second fiber layers 13d and 13e (first In the case of one embodiment, a fiber layer (hereinafter, referred to as a third fiber layer) including main fiber bundles (hereinafter sometimes referred to as 45° fiber bundles) 14a aligned in the 45° direction shown in FIG. 1A. There are 13a and 13h. The fiber-reinforced resin body 10 includes the 0° fiber bundle 14c included in the first fiber layers 13c and 13f, the 90° fiber bundle 14d included in the second fiber layers 13d and 13e, and the 45° included in the third fiber layers 13a and 13h. Main fiber bundles (hereinafter sometimes referred to as -45° fiber bundles) aligned in a direction intersecting with any of the fiber bundles 14a (in the case of the first embodiment, the -45° direction shown in FIG. 1A). .) 14b is included in the fiber layer (hereinafter, may be referred to as a fourth fiber layer) 13b and 13g.

Then, in the fiber-reinforced resin body 10, the orientation pattern in the fiber direction (orientation angle) of the main fiber bundle is symmetrical with the center in the thickness direction (the interface between the fiber layer 13d and the fiber layer 13e shown in FIG. 1B) as a plane of symmetry. The fiber layers are arranged so that That is, in the fiber layers 13a to 13d above the center in the thickness direction, the main fiber bundles are laminated in the order of 45°, −45°, 0°, and 90° from the top along the thickness direction of the fiber-reinforced resin body 10. Has been done. On the other hand, in the fiber layers 13e to 13h below the center in the thickness direction, the main fiber bundles are arranged in the thickness direction of the fiber-reinforced resin body 10 in the order of 90°, 0°, −45°, and 45° from the top. Are stacked along. According to the fiber-reinforced resin body 10 having the above-mentioned pseudo-isotropic laminated structure, the fiber-reinforced resin body 10 has sufficient strength against stress acting from multiple directions and can suppress defects such as warpage that occurs after molding. It should be noted that products such as undercarriage parts for automobiles usually have a bent portion and a concavo-convex portion, so that the orientation direction (orientation angle) of the main fiber bundle may vary, but variation of about ±5° is allowable To be done.

As described above, in the fiber-reinforced resin body 10 of the first aspect having the pseudo isotropic laminated structure, the first fiber layers 13c and 13f made of the 0° fiber bundle 14c, and the second fiber layer 13d made of the 90° fiber bundle 14d. , 13e, a third fiber layer 13a, 13h made of a 45° fiber bundle 14a, and a fourth fiber layer 13b, 13g made of a −45° fiber bundle 14b are laminated symmetrically with the center in the thickness direction as a plane of symmetry. It has a pseudo isotropic laminated structure. However, when the above-mentioned different orientation fiber layer laminated structure is adopted, the orientation angles of the main fiber bundle 14a of the third fiber layers 13a and 13h and the main fiber bundle 14b of the fourth fiber layers 13b and 13g are respectively The angle is not limited to 45° and −45°, and may be 30° and −60°, for example. That is, the orientation angles of the main fiber bundles 14a and 14b may be such that the relationship with the orientation angles of the main fiber bundles 14c and 14d satisfies the above-mentioned conditions. Further, the present invention is not limited to the fiber reinforced resin body 10 of the first aspect having a pseudo isotropic laminated structure (different orientation fiber layer laminated structure) due to the reinforcing portion 12, and also the first modified example and the second modified example described later. As in the example, also in the so-called cross-laminated fiber-reinforced resin body, the same effect as that of the fiber-reinforced resin body 10 of the first aspect can be obtained.

When the fiber-reinforced resin body 10 has a quasi-isotropic laminated structure as described above, it is possible to cope with a multiaxial stress state in which stress from multiple directions acts, but as shown in FIG. When a force is applied to the body 10 in the tensile direction and a large shear stress acts on the hole 11 in one direction (shear principal axis direction) through the mechanical fastening means 7 in a plan view, this shear principal axis direction (Fig. From the viewpoint of improving strength, it is desirable to arrange the fiber layer having the main fiber bundles oriented along the 0° direction in 1A). In this regard, in the fiber-reinforced resin body 10 of the first aspect, since the first fiber layers 13c and 13f having 0° fiber bundles oriented in the shear principal axis direction (0° direction) are arranged, the strength is improved. be able to.

Further, generally, a composite stress such as bending stress acts on the upper surface and the lower surface (surface) near the surface of the fiber-reinforced resin body 10, so that a fiber layer having a 0° fiber bundle 14c and a 90° fiber bundle 14d. When 13c to 13f are arranged on the front portion, initial breakage easily occurs in the fiber layer. On the other hand, in the fiber-reinforced resin body 10 of the first aspect, the third fiber layers 13a, 13h having 45° fiber bundles 14a, which are different from both the main shear axis direction and the direction orthogonal to the main shear axis direction, in the surface portion thereof. , The fourth fiber layers 13b and 13g having the -45° fiber bundle 14b are arranged. As described above, by disposing the fiber layer having the fiber bundles oriented in a direction different from both the main shear axis direction and the direction orthogonal to the main shear axis direction on the surface portion of the fiber-reinforced resin body 10, the stress acting in a composite manner can be obtained. It is preferable because the occurrence of initial fracture in the fiber layer can be suppressed. The order of stacking the third fiber layers 13a and 13h and the fourth fiber layers 13b and 13g arranged on the surface of the fiber-reinforced resin body 10 does not matter.

Furthermore, in the case of the fiber-reinforced resin body 10 having the pseudo isotropic laminated structure (different orientation fiber layer laminated structure) as described above, the fiber layers each including the main fiber bundle in which the fiber directions are orthogonal to each other are along the laminating direction. Are preferably adjacent to each other. That is, it is desirable that the first fiber layer 13c including the 0° fiber bundle 14c and the second fiber layer 13d including the 90° fiber bundle 14d be adjacent to each other in the stacking direction, and similarly, the 45° fiber The third fiber layer 13a including the bundle 14a and the fourth fiber layer 13b including the -45° fiber bundle 14b are preferably adjacent to each other in the stacking direction. By doing so, for example, initial fracture occurs in the fiber layer containing the main fiber bundles oriented in a certain fiber direction, even when cracks occur, the fiber layer adjacent to the fiber layer cracked, Since it contains a main fiber bundle that is oriented in a direction orthogonal to the orientation direction of the main fiber bundle that the fiber layer in which the crack has occurred, it is possible to prevent the crack that occurs in the fiber layer from propagating in the stacking direction. it can.

<Structure of Reinforcing Portion of First Aspect>
As described with reference to FIGS. 1A and 1B, the hole portion 11 into which the mechanical fastening means 7 of the fiber reinforced resin body 10 of the first aspect is inserted has a main fiber bundle included in a part of the fiber layers 13a and the like. It is formed by connecting the first through hole 11a formed so as to cut 14a and 14b and the second through hole 11b formed so as to penetrate through the reinforcing portion 12.

Then, as shown in FIGS. 1B, 1C, and 1D, the fiber-reinforced resin body 10 of the present embodiment is larger than the first through hole 11a having a diameter D1 formed in a part of the fiber layers 13a and the like. The reinforcing portion 12 having a diameter (diameter D2) and formed in another fiber layer 13c or the like and having a substantially circular shape in a plan view has a substantially cylindrical shape. It is arranged so that it fits inside. That is, in the present embodiment, the reinforcing portion 12 is arranged on the outer peripheral portion of the hole portion 11 over the entire periphery of the hole portion 11 in a plan view, and the main fiber bundles 14a and 14b such as some of the fiber layers 13a. There is a positional relationship that reinforces the outer peripheral portion of the first through hole 11a formed so as to cut. As described above, since the reinforcing portion 12 of the first aspect is arranged over the entire circumference of the peripheral edge of the hole portion 11, some fiber layers 13a and the like existing on the outer peripheral portion of the first through hole 11a are damaged. Can be suppressed.

As shown in FIG. 1B, the reinforcing portion 12 of the first aspect has a first reinforcing portion 12a having a wound fiber bundle 14e in which a second through hole 11b is formed in the center and a second through hole 11b in the center. The second reinforcing portion 12b having the formed radial fiber bundles 14f is formed by laminating two kinds of substantially annular fiber layers. That is, in the fiber-reinforced resin body 10 according to the present embodiment, the other fiber layers 13c and the like have the first fiber layers 13c and 13f in which the first reinforcing portions 12a are arranged and the second reinforcing portions 12b, respectively. It has 2nd fiber layers 13d and 13e. As described above, since the reinforcing portion 12 of the first aspect is configured by the first reinforcing portion 12a formed of the wound fiber bundle 14e and the second reinforcing portion 12b formed of the radial fiber bundle 14f, the orientation direction By configuring the different wound fiber bundles 14e and the different radial fiber bundles 14f as separate reinforcing portions, it becomes extremely easy to manufacture the fiber-reinforced resin body 10 having the reinforcing portions 12.

Specifically, of the two types of fiber layers, the first reinforcing portion 12a is the large-diameter hole portion 17 formed in the first fiber layers 13c and 13f, which are other fiber layers including the 0° fiber bundle 14c. And the second reinforcing portion 12b is arranged in the large-diameter hole portion 17 formed in the second fiber layers 13d and 13e that are other fiber layers including the 90° fiber bundle 14d, that is, the first It is preferable that the fiber layers 13c and 13f include the first reinforcing portion 12a and the second fiber layers 13d and 13e include the second reinforcing portion 12b from the viewpoint of improving strength. With this configuration, the capacity of the wound fiber bundle 14e of the first reinforcing portion 12a to bear the above-mentioned shear stress is increased, and some of the fiber layers 13a existing on the outer peripheral portion of the first through hole 11a, etc. Can be further suppressed.

The other fiber layers 13c and the like in which the first reinforcing portion 12a and the second reinforcing portion 12b are arranged as described above are arranged so as to form the central portion (inside) of the fiber-reinforced resin body 10 in the thickness direction from above. The layers 13c, 13d, 13e, and 13f are stacked in this order, and the reinforcing portion 12 is formed by stacking the first reinforcing portion 12a and the second reinforcing portion 12b. Then, a part of the fiber layer 13a or the like is laminated outside the other fiber layer 13c or the like so that the first through hole 11a communicates with the second through hole 11b of the reinforcing portion 12, and the reinforcing portion 12 is exposed on the surface. The fiber-reinforced resin body 10 is formed. The arrangement position of the reinforcing portion 12 is not limited to the central portion of the fiber reinforced resin body 10 as in the present embodiment, but may be exposed on the surface by arranging the reinforcing portion 12 at the front portion. However, since the front portion of the fiber-reinforced resin body 10 is likely to be damaged by a composite stress such as a bending stress acting on the front portion of the fiber-reinforced resin body 10, it is thick in terms of reinforcement and prevention of damage to the reinforcement portion 12 itself. It is desirable that the reinforcing portion 12 is provided inside the fiber-reinforced resin body 10 in the vertical direction so that the reinforcing portion 12 is not exposed on the surface of the fiber-reinforced resin body 10.

Further, as shown in FIG. 1B, it is desirable that the first reinforcing portion 12a and the second reinforcing portion 12b be adjacent to each other in the stacking direction. By doing so, the strength of the first fiber layers 13c and 13f including the wound fiber bundle 14e against punching shear fracture can be reliably compensated by the second fiber layers 13d and 13e including the radial fiber bundle 14f.

Each of the fiber layers 13a to 13h of the first aspect has been described by way of an example in which the unidirectional material, that is, one fiber layer is configured by one type of main fiber bundle, but is not limited thereto. Absent. Each fiber layer can also be configured using, for example, a non-crimp fabric (NCF) material. The non-crimp fabric material is a material in which a plurality of layers of main fiber bundles oriented in a predetermined direction are laminated and stitched with a thread such as nylon or polyester. For example, two fiber layers (for example, the fiber layers 13a and 13b) are formed by impregnating the non-crimp woven material in which the 45° fiber bundle 14a and the −45° fiber bundle 14b are fixed by stitching with the resin 15. It

Further, each fiber layer of the fiber-reinforced resin body may be formed of, for example, a plain weave material in which a set of main fiber bundles oriented in directions orthogonal to each other (intersecting) are woven. Specifically, the plain weave material has a main fiber bundle oriented in the first direction (aligned) and a main fiber bundle oriented in the second direction (aligned) in a lattice pattern. It is a woven fabric.

When each fiber layer of the fiber reinforced resin body is composed of unidirectional material or non-crimp woven material, the orientation pattern of the main fiber bundle is set appropriately by the laminated structure of the fiber layer, as compared with the case of using plain woven material. This is advantageous in that the strength of the fiber-reinforced resin body 10 can be easily adjusted. On the other hand, when each fiber layer of the fiber-reinforced resin body is composed of a plain woven material, the main fiber bundles are woven together, so that the fibers are hard to be unraveled, compared to the case where a unidirectional material or a non-crimp woven material is used. Is advantageous.

In addition, the type of fibers constituting the fiber bundles 14a to 14f is not particularly limited, and various fibers such as carbon fiber, synthetic fiber and glass fiber can be used, but the fiber reinforced resin has high mechanical strength and is lightweight. It is preferable to use carbon fibers for the fiber bundles 14a to 14f from the viewpoint that a body can be obtained.

In the first aspect, the case where one hole 11 is formed in the fiber-reinforced resin body 10 has been described as an example, but the present invention is not limited to this, and a plurality of holes is formed in the fiber-reinforced resin body 10. It may have been done.

<The manufacturing method of the fiber reinforced resin body of a 1st aspect>
Hereinafter, the method for producing the fiber-reinforced resin body of the first aspect will be described. FIG. 2 is a plan view showing each member constituting the fiber-reinforced resin body according to the first aspect, and FIG. 3 is a cross-sectional view of a main part showing a manufacturing process of the fiber-reinforced resin body according to the first aspect.

First, the material (member) constituting the fiber-reinforced resin body 10 of the first aspect will be described. As shown in FIG. 2, a fiber sheet composed of fiber bundles oriented in a predetermined direction, which is a member forming the third fiber layers 13a and 13h (see FIG. 1B) (hereinafter, referred to as a third fiber layer sheet). The same applies to the following fiber sheets forming a fiber layer and a reinforcing portion.) 83a and 83h are prepared. Similarly, the fourth fiber layer sheets 83b and 83g, the first fiber layer sheets 83c and 83f, the second fiber layer sheets 83d and 83e, the first reinforcing portion sheet 82a and the second reinforcing portion sheet 82b will be described below. prepare. The third fibrous layer sheets 83a and 83h and the fourth fibrous layer sheets 83b and 83g have a first through hole 11a having a diameter D1 which penetrates along the thickness direction thereof, and a first reinforcing portion sheet 82a. Also, the second reinforcing portion sheet 82b has a second through hole 11b having a diameter D1 that penetrates along the thickness direction thereof. In addition, the first and second fibrous layer sheets 83c to 83f have large-diameter holes 17 having a diameter D2 that penetrates along the thickness direction. In addition, the orientation pattern of the fiber bundles included in each of the fiber sheets 83a to 83h, 82a, and 82b is defined by the fiber layers 13a to 13h, the first reinforcing portion 12a, and the second reinforcing portion that should be formed by the fiber sheets 83a to 83h, 82a, and 82b. It corresponds to the orientation pattern of the fiber bundle in the portion 12b. For example, the third fiber layer sheet 83a for forming the third fiber layer 13a composed of the 45° fiber bundle 14a is composed of the 45° fiber bundle 14a. Further, the fiber bundles 14a to 14f forming the fiber sheets 83a to 83h, 82a, and 82b are temporarily joined to each other such that the fiber sheets laminated in a shaping process described later do not lose their shape in handling in the subsequent process. For this purpose, a binder (binding material) such as an epoxy resin is attached to the surface thereof.

The first through-hole 11a formed in the third fiber layer sheets 83a, 83h and the fourth fiber layer sheets 83b, 83g, and the first reinforcing portion sheet 82a and the second reinforcing portion sheet 82b were formed. The inner diameter dimension D1 of the second through hole 11b is smaller than the inner diameter dimension D2 of the large diameter hole portion 17 formed in the first and second fiber layer sheets 83c to 83f. The inner diameter dimension D2 of the large-diameter hole portion 17 and the outer diameter dimension D2 of the first reinforcing portion seat 82a and the second reinforcing portion seat 82b are substantially the same. That is, the first reinforcing portion sheet 82a and the second reinforcing portion sheet 82b are configured to be able to be fitted into the large diameter holes 17 of the first and second fiber layer sheets 83c to 83f.

Next, a manufacturing process of the fiber-reinforced resin body 10 of the first aspect will be described. As shown in FIG. 3, the method for producing a fiber-reinforced resin body according to the first aspect includes a laminating step (S11), a shaping step (S12), and a resin impregnating step (S13). It is an example of manufacturing a body.

In the laminating step (S11), the fiber sheets 83h, 83g,..., 83a are laminated in this order from below on the mold K, and the first reinforcing portion sheet 82a and the second reinforcing portion sheet 82b are predetermined. It is a step of arranging at the position of. Hereinafter, the laminating step (S11) will be specifically described. However, as described above, the fiber-reinforced resin body 10 of the first embodiment having the pseudo-isotropic laminated structure (different orientation fiber layer laminated structure) has the center in the thickness direction. Since the fiber layers are arranged so that the orientation pattern in the fiber direction of the main fiber bundle is symmetric with respect to the symmetry plane, the lower fiber layers 13h to 13e (see FIG. 1B) are formed from the center in the thickness direction. Only the method for laminating the third fiber layer sheet 83h to the second fiber layer sheet 83e will be described in detail, and the second fiber layer sheet 83d to the third fiber layer sheet 83a forming the upper fiber layers 13d to 13a will be described. Detailed description of the stacking method is omitted.

As shown in FIG. 3, the mold K is provided with a cylindrical protrusion K1 having an outer diameter D1. First, the third fiber layer sheet 83h forming the third fiber layer 13h, which is the lowermost fiber layer, is placed in the mold K so that the protrusion K1 is inserted into the first through hole 11a. Hereinafter, also when stacking the third and fourth fiber layer sheets 83g, 83b, 83a, they are similarly arranged and stacked so that the projection K1 is inserted into each of the first through holes 11a. By doing so, in the fiber-reinforced resin body 10 finally obtained, it is possible to suppress the positional deviation of the holes 11.

Subsequent to the arrangement of the third fiber layer sheet 83h, the fourth fiber layer sheet 83g is laminated thereon (step S111). Next, the first fiber layer sheet 83f is laminated on the fourth fiber layer sheet 83g (step S112), and then the second through hole 11b is inserted into the protrusion K1 of the mold K for the first fiber layer sheet. The first reinforcing portion seat 82a is fitted into the large-diameter hole portion 17 of the seat 83f (step S113).

Then, the second fiber layer sheet 83e is laminated on the first fiber layer sheet 83f (step S114), and then the second fiber layer sheet 83e is inserted into the protrusion K1 of the mold K while inserting the second through hole 11b. The second reinforcing portion seat 82b is fitted into the large-diameter hole portion 17 of the seat 83e (step S115).

After the step S115 is completed, the upper surface of the laminated second fiber layer sheet 83e is made to be a plane of symmetry in the thickness direction, and the second fiber layer sheet 83d and the first fiber layer are provided on the second fiber layer sheet 83e. Sheet 83c, fourth fiber layer sheet 83b, and third fiber layer sheet 83a are laminated in this order. The second reinforcing portion sheet 82b and the first reinforcing portion sheet 82a are fitted and arranged in the large-diameter holes 17 of each of the second fiber layer sheet 83d and the first fiber layer sheet 83c. (Step S116). With the above, the stacking step (S11) is completed.

In the shaping step (S12), the fiber sheets 83a to 83h laminated in the laminating step (S11) are sandwiched between the mold K and its lid K2, and heated while applying pressure along the laminating direction. Then, a preform (intermediate body) 18 is formed. Here, since the binder is attached to the surfaces of the main fiber bundles constituting the respective fiber sheets 83a to 83h as described above, the preform 18 in which the respective fiber sheets 83a to 83h are temporarily joined together by the pressure is applied. The preform 18 can be obtained and does not lose its shape due to handling in the subsequent steps. Since each of the fibrous sheets 83a to 83h has elasticity, a spring K3 is provided between the bottom of the protrusion K1 and the mold K to absorb this elasticity in the shaping step (S12). By doing this, the projection K1 sinks when sandwiching the fiber sheets 83a to 83h between the mold K and the lid portion K2, and the fiber sheets 83a to 83h are sufficiently pressed to shape. You can

In the resin impregnation step (S13), the preform 18 is impregnated with the resin 15 and cured by, for example, resin transfer molding or infusion molding. Through the above steps, the fiber-reinforced resin body 10 of the first aspect is completed.

<Application example of the fiber-reinforced resin body of the first aspect>
Hereinafter, a vehicle wheel that is an application example of the fiber-reinforced resin body of the first aspect will be described.

FIG. 4A is a plan view showing a vehicle wheel that is an application example of the fiber-reinforced resin body of the first aspect, and FIG. 4B is a side view showing the vehicle wheel. FIG. 4C is an enlarged sectional view taken along the line AA of FIG. 4B. FIG. 4D is an enlarged cross-sectional view of an essential part of the H portion of FIG. 4C.

As shown in FIGS. 4A and 4B, a vehicle wheel 1 that is an application example of the fiber-reinforced resin body of the first aspect includes a substantially annular rim portion 5 and a disc portion 3. The disc portion 3 and the rim portion 5 are joined by a mechanical fastening means (for example, a bolt) 7.

The disk portion 3 includes a hub portion 3a to which an axle is fastened, and a plurality of spoke portions 3b radially extending from the outer peripheral surface of the hub portion 3a. The disk portion 3 is made of, for example, aluminum and is manufactured by casting or forging, for example. The material of the disk portion 3 is not particularly limited, and the shape of the disk portion 3 is not limited to the illustrated example.

As shown in FIG. 4C, the rim portion 5 has flange portions 5a and 5g formed at both end portions thereof, and the bead seat portions 5b and 5f and the hump portions 5c and 5e are arranged inside the flange portions 5a and 5g in order from the outside. , The drop portion 5d is formed. The shape of the rim portion 5 is not limited to the illustrated example.

The resin portions 9a, 9b, 9c, 9d, 9e are arranged inside a predetermined portion of the rim portion 5, particularly a thick portion (thick portion). More specifically, the resin portion 9a is arranged on the flange portion 5a, the resin portion 9b is arranged on the hump portion 5c, and the resin portion 9c is arranged near the end portion of the drop portion 5d on the hump portion 5c side. The resin portion 9d is arranged on the hump portion 5e, and the resin portion 9e is arranged on the flange portion 5g.

As shown in FIG. 4D, the rim portion 5 is mainly composed of the fiber-reinforced resin body 10 of the first aspect. Holes 11 are formed in the hump portion 5c at predetermined intervals in the circumferential direction. This hole portion 11 corresponds to the hole portion 11 formed by penetrating in the thickness direction of the fiber-reinforced resin body 10 of the first aspect. A female screw portion 3c is formed on the disc portion 3 at a position corresponding to each hole 11. From the outer surface side of the rim portion 5, the bolt 7 which is a mechanical fastening means is inserted into the hole portion 11. The rim portion 5 and the disc portion 3 are joined by screwing the male screw portion at the tip of the bolt 7 into the female screw portion 3c of the disc portion 3 arranged on the inner circumference of the rim portion 5. That is, the hump portion 5c serves as a connecting portion 5h between the rim portion 5 and the disc portion 3. The head of the bolt 7 is covered with resin, and the resin is arranged on the outer surface side of the hole 11.

In the vehicle wheel 1 to which the fiber-reinforced resin body 10 of the first aspect is applied, by adopting the above-described configuration, as shown in FIG. 4D, for example, stress is exerted on the joint portion 5h by an external force. Even when stress acts on the outer peripheral portion of the hole 11, the damage of some of the fiber layers 13a existing on the outer peripheral portion of the hole 11 is suppressed and the breaking strength of the rim portion 5 is increased. You can

Although the fiber-reinforced resin body forming the rim portion 5 has been described as an example of the fiber-reinforced resin body 10 of the first aspect, the present invention is not limited to this, and for example, in Modification 1 described later. The fiber-reinforced resin body 20 to the fiber-reinforced resin body 40 of Modification 3 or the fiber-reinforced resin body 50 of the second aspect to the fiber-reinforced resin body 70 of the fourth aspect may be used.

(Modification 1)
Hereinafter, a first modification of the first aspect (hereinafter, referred to as modification 1) will be described with reference to the drawings. In each drawing showing the modified example 1, the same or similar constituent elements as those of the fiber-reinforced resin body of the first aspect are indicated by the same or similar symbols or reference numerals, and the description will not be repeated in principle and will be omitted (hereinafter The same applies to other modified examples and embodiments described below. Further, since the method for manufacturing the fiber-reinforced resin body according to the following modifications is the same as the method for manufacturing the fiber-reinforced resin body according to the first aspect shown in FIG. 3, the description thereof will be omitted.

Hereinafter, the configuration of the fiber-reinforced resin body of Modification 1 will be described. FIG. 5A is a cross-sectional view of essential parts showing a structure of a fiber-reinforced resin body according to Modification Example 1, taken at a position corresponding to a line A-A′ in FIG. 1A. 5B is a cross-sectional view of an essential part showing a structure of the fiber-reinforced resin body according to Modification 1 taken along line BB′ of FIG. 5A, and FIG. 5C is a fiber-reinforced resin body according to Modification 1 5B is a cross-sectional view of essential parts showing a structure taken along line CC′ of FIG. 5A. The plan view showing the fiber-reinforced resin body 20 according to the modified example 1 is the same as the plan view showing the fiber-reinforced resin body 10 according to the first mode shown in FIG. 1A.

As shown in FIGS. 5A to 5C, the fiber-reinforced resin body 20 of Modification 1 is basically configured similarly to the fiber-reinforced resin body 10 of the first aspect, but the fiber-reinforced resin of Modification 1 is used. The body 20 is different in that it has a so-called orthogonal laminated structure. Hereinafter, the fiber-reinforced resin body 20 of Modification 1 will be described in detail.

As shown in FIG. 5A, the fiber-reinforced resin body 20 of the modified example 1 includes third fiber layers 23a, 23c, 23f, and 23h including a 45° fiber bundle 14a as a main fiber bundle and a −45° fiber bundle 14b. It has eight laminated fiber layers 23a to 23h composed of the fourth fiber layers 23b, 23d, 23e and 23g. Then, in the fiber-reinforced resin body 20, the orientation pattern in the fiber direction of the main fiber bundle is symmetrical with the center in the thickness direction (interface between the fiber layer 23d and the fiber layer 23e shown in FIG. 5A) as a symmetry plane. , The fiber layers are arranged. That is, the orientation directions of the fiber directions of the main fiber bundles forming the eight fiber layers 23a to 23h are 45°, −45°, 45°, −45°, −45°, 45°, −45° from above. , 45°. The configurations of the fiber layers 23a, 23b, 23g, and 23h of Modification 1 are basically the same as those of the fiber layers 13a, 13b, 13g, and 13h of the first aspect.

In the fiber-reinforced resin body 20 according to the modified example 1, of the eight fiber layers 23a to 23h, some of the fiber layers 23a, 23b, 23g, and 23h arranged on the front surface (hereinafter, some of the fiber layers 23a Etc.) has a first through hole 11a formed so as to penetrate in the stacking direction and cut the main fiber bundles 14a and 14b. Further, the other fiber layers 23c to 23f (hereinafter, also referred to as other fiber layers 23c and the like) obtained by removing the above-mentioned part of the fiber layers 23a and the like from the eight fiber layers 23a to 23h are the first penetrations. It has a large-diameter hole portion 17 having a diameter larger than that of the hole 11a and a reinforcing portion 12 arranged so as to be fitted into the large-diameter hole portion 17. The reinforcing portion 12 has a second through hole 11b penetrating the reinforcing portion 12.

In the fiber reinforced resin body 20 of the modified example 1, the other fiber layers 23c and the like are the fourth fibers in which the third fiber layers 23c and 23f in which the first reinforcing portions 12a are arranged and the second fiber portions 12b are arranged respectively. It has layers 23d and 23e. Specifically, of the two types of fiber layers, the first reinforcing portion 12a is the large-diameter hole portion 17 formed in the third fiber layers 23c and 23f, which is another fiber layer including the 45° fiber bundle 14a. It is located in. The second reinforcing portion 12b is arranged in the large-diameter hole portion 17 formed in the fourth fiber layers 23d and 23e, which are other fiber layers including the -45° fiber bundle 14b.

As described above, in the fiber-reinforced resin body 20 of Modified Example 1, the fiber layers 13a to 13h of the pseudo-isotropic laminated structure of the fiber-reinforced resin body 10 of the first aspect are modified to the fiber layers 23a to 23h of the orthogonal laminated structure. It is a thing. Therefore, even when a force is input to the fiber-reinforced resin body 20 of the modified example 1 and stress concentration occurs on the outer peripheral portion of the hole portion 11, the reinforcement portion 12 causes the stress to concentrate in the same manner as the fiber-reinforced resin body 10 of the first aspect. It is possible to suppress breakage of a part of the fiber layer 23a and the like existing on the outer peripheral portion of the hole 11 and increase the breaking strength of the fiber-reinforced resin body 20.

In addition, in the fiber-reinforced resin body 20 of the modified example 1, as in the fiber-reinforced resin body 10 of the first aspect, the 45° fibers which are different from both the shear principal axis direction and the direction orthogonal to this in the surface portion thereof. The third fiber layers 23a and 23h having the bundle 14a and the fourth fiber layers 23b and 23g having the -45° fiber bundle 14b are arranged. Thus, by disposing a fiber layer having a fiber bundle oriented in a direction different from both the main shear axis direction and the direction orthogonal to the main shear axis direction on the surface portion of the fiber reinforced resin body 20, the stress acting in a composite manner can be obtained. It is possible to more reliably suppress the occurrence of initial breakdown. As described above, the main fiber bundles 14a of the third fiber layers 23a, 23c, 23f, and 23h, and the main fiber bundles 14b of the fourth fiber layers 23b, 23d, 23e, and 23g have an orientation angle of 45°, respectively. The angle is not limited to −45°, and may be 30° or −60°, for example.

(Modification 2)
Hereinafter, a second modification of the first aspect (hereinafter, referred to as modification 2) will be described with reference to the drawings.

Hereinafter, the configuration of the fiber-reinforced resin body of Modification 2 will be described. 6A is a plan view showing a fiber-reinforced resin body according to Modification 2, and FIG. 6B is a diagram showing a structure of the fiber-reinforced resin body according to Modification 2 taken along the line AA′ in FIG. 6A. FIG.

As shown in FIGS. 6A and 6B, the fiber-reinforced resin body 30 of the modified example 2 is basically configured in the same manner as the fiber-reinforced resin body 10 of the first aspect, but the fiber-reinforced resin body of the modified example 2 is used. The body 30 is different in that it has an orthogonal laminated structure as in the first modification. Hereinafter, the fiber-reinforced resin body 30 of Modification 2 will be described in detail.

As shown in FIG. 6B, the fiber-reinforced resin body 30 of Modification 2 includes first fiber layers 33a, 33c, 33f, 33h including 0° fiber bundles 14c as main fiber bundles and 90° fiber bundles 14d. It has eight laminated fiber layers 33a to 33h composed of two fiber layers 33b, 33d, 33e and 33g. Then, in the fiber-reinforced resin body 30, the orientation pattern in the fiber direction of the main fiber bundle is symmetrical with the center in the thickness direction (the interface between the fiber layer 33d and the fiber layer 33e shown in FIG. 6B) as a plane of symmetry. , The fiber layers are arranged. That is, the orientation directions of the fiber directions of the main fiber bundles forming the eight fiber layers 33a to 33h are 0°, 90°, 0°, 90°, 90°, 0°, 90°, 0° from the top. Become. The configurations of the fiber layers 33c to 33f of Modification 2 are basically the same as the configurations of the fiber layers 13c to 13f of the first aspect, respectively.

In the fiber-reinforced resin body 30 according to the modified example 2, among the eight fiber layers 33a to 33h, some of the fiber layers 33a, 33b, 33g, 33h arranged on the front surface (hereinafter, some of the fiber layers 33a Etc.) has a first through hole 11a formed so as to penetrate in the stacking direction and cut the main fiber bundles 14c and 14d. Further, the other fiber layers 33c to 33f (hereinafter, may be referred to as other fiber layers 33c and the like) excluding the above-mentioned part of the fiber layers 33a and the like from the eight fiber layers 33a to 33h are the first penetrations. It has a large-diameter hole portion 17 having a diameter larger than that of the hole 11a and a reinforcing portion 12 arranged so as to be fitted into the large-diameter hole portion 17. The reinforcing portion 12 has a second through hole 11b penetrating the reinforcing portion 12.

In the fiber reinforced resin body 30 of the modified example 2, the other fiber layers 33c and the like are the second fibers in which the first fiber portions 33c and 33f in which the first reinforcing portions 12a are arranged and the second reinforcing portions 12b are arranged respectively. It has layers 33d and 33e. Specifically, of the two types of fiber layers, the first reinforcing portion 12a is the large-diameter hole portion 17 formed in the first fiber layers 33c and 33f, which are other fiber layers including the 0° fiber bundle 14c. It is located in. The second reinforcing portion 12b is arranged in the large-diameter hole portion 17 formed in the second fiber layers 33d and 33e which are other fiber layers including the 90° fiber bundle 14d. That is, in the fiber reinforced resin body according to the modified example 2, a cross-sectional view of a main part showing a structure cut along the line BB′ of FIG. 6B shows that the fiber layer 13c of FIG. 1C is the fiber layer 33c. The cross-sectional view of the main part showing the structure cut along the CC′ line of 6B is the same as the one in which the fiber layer 13d of FIG. 1D is used as the fiber layer 33d.

As described above, in the fiber-reinforced resin body 30 of Modification 2, the fiber layers 13a to 13h of the pseudo-isotropic laminated structure of the fiber-reinforced resin body 10 of the first aspect are modified into the fiber layers 33a to 33h of the orthogonal laminated structure. It is a thing. Therefore, even when a force is input to the fiber-reinforced resin body 30 of the modified example 2 and stress concentration occurs in the outer peripheral portion of the hole portion 11, the reinforcement portion 12 causes the stress to concentrate in the same manner as the fiber-reinforced resin body 10 of the first aspect. It is possible to suppress the breakage of a part of the fiber layer 33a and the like existing on the outer peripheral portion of the hole 11 and increase the breaking strength of the fiber-reinforced resin body 30.

In addition, in the fiber-reinforced resin body 30 of Modification Example 2, the first reinforcing portion 12a is provided in the large-diameter hole portion 17 formed in the first fiber layers 33c and 33f which are other fiber layers including the 0° fiber bundle 14c. Since the second reinforcing portion 12b is arranged in the large-diameter hole portion 17 formed in the second fiber layers 33d and 33e that are other fiber layers including the 90° fiber bundle 14d, the fiber reinforcement The breaking strength of the resin body 30 can be further improved.

(Second embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

<Structure of Fiber Reinforced Resin Body of Second Aspect and Its Effect>
The configuration of the fiber-reinforced resin body of the second aspect will be described below. FIG. 7A is a plan view showing a fiber-reinforced resin body according to a second aspect, and FIG. 7B is a view showing a structure cut along the line AA′ in FIG. 7A in the fiber-reinforced resin body according to the second aspect. FIG. FIG. 7C is a cross-sectional view of a main part showing a structure taken along line BB′ of FIG. 7B in the fiber-reinforced resin body according to the second aspect, and FIG. 7D is a fiber-reinforced resin body according to the second aspect. 7B is a sectional view of a key portion showing the structure taken along the line CC′ of FIG. 7B.

As shown in FIGS. 7A to 7D, the fiber-reinforced resin body 50 of the second aspect is basically configured in the same manner as the fiber-reinforced resin body 10 of the first aspect, but the reinforcing portion 52 has a plan view. In that the holes 11 are arranged along a part of the periphery of the hole 11. Hereinafter, the fiber-reinforced resin body 50 of the second aspect will be described in detail.

As shown in FIG. 7B, the fiber-reinforced resin body 50 of the second aspect has eight laminated fiber layers 53a, 53b, 53c, 53d, 53e, 53f, 53g, 53h. In addition, in the fiber-reinforced resin body 50 according to the second aspect, among the eight fiber layers 53a to 53h, some of the fiber layers 53a, 53b, 53g, and 53h arranged on the front portion (hereinafter, some of the fibers). The layers 53a and the like may have the same structure as some of the fiber layers 13a and the like of the first aspect.

In the fiber-reinforced resin body 50 according to the second aspect, the other fiber layers 53c to 53f (hereinafter, referred to as other fiber layers 53c etc.) from the eight fiber layers 53a to 53h except the above-mentioned part of the fiber layers 53a etc. Has a large diameter hole portion 57 having a diameter larger than that of the first through hole 11a, and a reinforcing portion 52 arranged so as to be fitted into the large diameter hole portion 57. Then, as shown in FIGS. 7C and 7D, the reinforcing portion 52 has a second through hole 51b penetrating the reinforcing portion 52. As shown in FIGS. 7C and 7D, in plan view, the large-diameter hole portion 57 of the second aspect is arranged on the left side of the center O with respect to the center O thereof only within the range of the angle θ in the circumferential direction. The shape in plan view is a substantially semicircular shape. The second through hole 51b is also arranged only in the range of the angle θ in the circumferential direction with the center O of the large diameter hole portion 57 as a reference, and its shape in plan view is a semicircular shape. The center of the second through hole 51b coincides with the center O of the large diameter hole portion 57.

On the other hand, in the other fiber layers 53c to 53f of the present embodiment, with respect to the center O of the large diameter hole portion 57 as a reference, the angle (360°) on the right side of the center O where the large diameter hole portion 57 is not arranged in the circumferential direction. In the range of −θ), the first through holes 51c formed so as to cut the main fiber bundles 14c and 14d and having a substantially semicircular shape in plan view are included. The center of the first through hole 51c coincides with the center O of the large diameter hole portion 57, similarly to the second through hole 51b. Therefore, the second through hole 51b formed in the reinforcing portion 52 and the first through hole 51c formed in the other fiber layer 53c and the like are each substantially semicircular and have the common center O. In the plan view, one substantially circular through hole is formed. Therefore, the hole portion 11 of the present embodiment is formed in the first through hole 11a formed in the part of the fiber layer 13a and the like, the first through hole 51c formed in the other fiber layer 53c and the reinforcing portion 52. The second through hole 51b thus formed is communicated with the second through hole 51b.

The fiber-reinforced resin body 50 of the second aspect has a large-diameter hole portion 57 having a larger diameter than the first through hole 11a, which is formed in the other fiber layers 53c and the like excluding the part of the fiber layers 53a and the like. The substantially semi-cylindrical reinforcing portion 52 is arranged so as to be fitted to the inner circumference of the large diameter hole portion 57. That is, the reinforcing portion 52 of the second aspect is arranged in the outer peripheral portion along the peripheral edge of the substantially semicircular second through hole 51b (that is, a part of the hole portion 11) in plan view, In a plan view, it has a positional relationship of reinforcing a part of the outer peripheral portion of the first through hole 11a formed so as to cut the main fiber bundles 14a and 14b such as a part of the fiber layers 53a.

And the reinforcement part 52 of a 2nd aspect WHEREIN: Similar to the reinforcement part 12 shown to FIG. 1C and FIG. 1D, the 1st reinforcement part 52a which has the winding fiber bundle 14e shown to FIG. 7C and 7D, and a radial fiber bundle. The second reinforcing portion 52b having 14f is formed by laminating two types of substantially fan-shaped fiber layers. That is, in the fiber-reinforced resin body 50 of the second aspect, the other fiber layers 53c and the like are the first fiber layers 53c and 53f in which the first reinforcing portions 52a are arranged and the second fiber portions 53b in which the second reinforcing portions 52b are arranged. It has two fiber layers 53d and 53e. Even in the fiber-reinforced resin body 50 of the second aspect, similarly to the reinforcement portion of the first aspect, the first reinforcement portion 52a composed of the wound fiber bundle 14e alone and the second reinforcement portion 52b composed of the radial fiber bundle 14f alone. Then, the reinforcing portion 52 may be configured. In addition, since the first through holes 51c formed in the other fiber layers 53c and the like cut the main fiber bundles 14c and 14d included in the other fiber layers 53c and the like, the fiber reinforcement of the fourth aspect described below. Similar to the resin body, in plan view, a plurality of fiber layers 53a to 53h are provided with connecting threads sewn in the laminating direction on the outer peripheral portion of the first through hole 51c, and the fiber layers 53a to 53h are arranged. It is preferable to bundle and fix the main fiber bundles 14a to 14d included in 53h in the stacking direction.

According to the fiber-reinforced resin body 50 according to the second aspect of such a configuration, the reinforcing portion 52 in the circumferential direction with reference to a part of the peripheral edge of the hole portion 11, that is, the center O of the hole portion 11 in a plan view. By arranging only within the range of the angle θ, the following operational effects can be achieved. That is, in the hole 11 into which the mechanical fastening means (bolt) 7 of the rim portion 5 of the vehicle wheel 1 shown in FIGS. 4A to 4D is inserted, structurally large tensile stress or shear stress in a specific direction. May act. Specifically, as shown in FIG. 7A, when the stress acts along the tensile direction of the fiber-reinforced resin body 50 (fiber direction of 0°), the mechanical fastening means 7 pulls the inner wall of the hole portion 11 by pulling. It abuts the area D along the direction. As a result, in some of the fiber layers 53a and the like existing on the outer peripheral portion of the first through hole 11a, a large stress acts on a specific area D of the outer peripheral portion of the hole portion 11 and exists on the area D. The main fiber bundles 14a and 14b themselves are easily broken.

On the other hand, since the fiber-reinforced resin body 50 of the second aspect has the characteristic configuration as described above, the reinforcing portion 52 has the main fiber bundle 14a such as a part of the fiber layer 53a in plan view. , 14b are provided so as to reinforce a part (for example, region D) of the outer peripheral portion of the first through hole 11a formed so as to be cut. That is, in order to correspond to the stress acting in the above-described specific direction, the reinforcing portion 52 is arranged within the range of the angle θ at which the stress is concentrated in the circumferential direction with the center O of the hole 11 as a reference. Since the reinforcing portion 52 includes the wound fiber bundle 14e and the radial fiber bundle 14f, even when stress concentrates on a part of the outer peripheral portion of the hole portion 11, the stress is exerted by the reinforcing portion 52. By bearing the burden, it is possible to suppress damage to a part of the fiber layer 53a or the like on the outer peripheral portion of the first through hole 11a formed by cutting the main fiber bundles 14a and 14b. As a result, delamination of some of the fiber layers 53a and the like is suppressed, and the fiber-reinforced resin body 50 can be prevented from being broken.

In addition, the configuration such as the positional relationship between the first reinforcing portion and the second reinforcing portion, the configuration such as the laminated structure of the first fiber layer to the fourth fiber layer, which has been described as the preferred embodiment of the fiber-reinforced resin body of the first aspect, Of course, the fiber-reinforced resin body 50 of the second aspect can also be applied. (The same applies to the fiber-reinforced resin bodies of the third and fourth aspects described below.)

Further, the fiber layers 53a to 53h of the fiber reinforced resin body 50 of the second aspect have been described by way of an example in which the fiber layers 53a to 53h have the same configurations as the fiber layers 13a to 13h of the fiber reinforced resin body 10 of the first aspect. The fiber reinforced resin body 20 of Modification 1 or the fiber layer of the fiber reinforced resin body 30 of Modification 2 may have the same configuration. (The same applies to the fiber-reinforced resin bodies of the third and fourth aspects described below.)

<The manufacturing method of the fiber reinforced resin body of a 2nd aspect>
In the method for manufacturing a fiber-reinforced resin body according to the second aspect, (1) a first fiber layer sheet that is a member forming the first fiber layer 53c shown in FIG. 7C and a second fiber layer 53d shown in FIG. 7D are formed. The substantially semicircular large-diameter hole portion 57 to be formed in the second fibrous layer sheet that is a member is formed in the range of an angle θ in the circumferential direction with reference to the center O of the hole portion, ( 2) In the sheet for the first fiber layer and the sheet for the second fiber layer, the substantially semicircular first through hole 51c has the large diameter hole portion 57 arranged in the circumferential direction with the center O of the hole portion as a reference. Not formed in the range of an angle (360°−θ), (3) a first reinforcing portion sheet that is a member forming the first reinforcing portion 52a shown in FIG. 7C, and a second reinforcing portion shown in FIG. 7D. The second reinforcing portion sheet that is a member forming the portion 52b is substantially fan-shaped, which is different from the first aspect. Others are the production of the fiber-reinforced resin body of the first aspect shown in FIGS. 2 and 3. Since the method is the same as the method, other detailed description will be omitted.

(Third Embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

<Structure of Fiber Reinforced Resin Body of Third Aspect and Its Effect>
The configuration of the fiber-reinforced resin body of the third aspect will be described below. FIG. 8A is a fragmentary cross-sectional view showing a structure of the fiber-reinforced resin body according to the third aspect, taken at a position corresponding to the line AA′ in FIG. 1A. FIG. 8B is a cross-sectional view of a main part showing a structure taken along line BB′ of FIG. 8A in the fiber-reinforced resin body according to the third aspect, and FIG. 8C is a fiber-reinforced resin body according to the third aspect. FIG. 9B is a cross-sectional view of a main portion showing the structure cut along the line CC′ of FIG. 8A. The plan view showing the fiber-reinforced resin body 60 according to the third aspect is the same as the plan view showing the fiber-reinforced resin body 10 according to the first aspect shown in FIG. 1A. As will be described in detail below, the fiber-reinforced resin body of the third aspect is different from the fiber-reinforced resin body of the first aspect only in that the reinforcing portion is made of a woven fabric, and the others are the same as those of the first aspect. Since it is the same as the fiber-reinforced resin body, description of the manufacturing method thereof is omitted.

As shown in FIGS. 8A to 8C, the fiber-reinforced resin body 60 of the third aspect is basically configured in the same manner as the fiber-reinforced resin body 10 of the first aspect, but the reinforcing portion 62 has a hole portion. Fiber bundles (winding fiber bundles) 14e oriented around the central axis of 11 and fiber bundles (radial fiber bundles) 14f radially oriented from the center of the hole 11 are woven together into a woven fabric 14g. It is different from the reinforcing portion 12 of the first aspect in that it is provided. Hereinafter, the fiber-reinforced resin body 60 of the third aspect will be described in detail.

As shown in FIG. 8A, the fiber reinforced resin body 60 of the third aspect has eight laminated fiber layers 13a to 13h, as in the first aspect. The other fiber layers 13c and the like excluding the above-mentioned part of the fiber layers 13a and the like from the eight fiber layers 13a to 13h are large-diameter hole portions 17 and reinforcements arranged so as to fit into the large-diameter hole portions 17. It has a portion 62.

As shown in FIGS. 8A to 8C, the reinforcing portion 62 of the third aspect is configured by a substantially annular fabric 14g in which a wound fiber bundle 14e and a radial fiber bundle 14f are woven together. It is formed by laminating a plurality of (4 layers) 14 g. That is, in the fiber-reinforced resin body 60 of the third aspect, the woven fabric 14g is arranged in each of the large-diameter hole portions 17 formed in the other fiber layer 13c or the like to form the reinforcing portion 62. Specifically, the woven fabric 14g includes the first fiber layers 13c and 13f that are the other fiber layers that include the 0° fiber bundle 14c, and the second fiber layer 13d that is the other fiber layer that includes the 90° fiber bundle 14d. , 13e are respectively arranged in the large-diameter hole portions 17 formed in the holes 13e. Although the reinforcing portion 62 may be configured by laminating a plurality of substantially annular fabrics 14g as described above, the entire fabric is a unified fabric of the wound fiber bundle 14e and the radial fiber bundle 14f. Alternatively, the reinforcing portion 62 may be configured.

According to the fiber-reinforced resin body 60 according to the third aspect, the reinforcing portion 62 is composed of the woven fabric 14g in which the wound fiber bundle 14e and the radial fiber bundle 14f are woven together, and the reinforcement portion 62 is concerned. However, in a plan view, there is a positional relationship that reinforces the outer peripheral portion of the first through hole 11a formed so as to cut the main fiber bundles 14a and 14b such as a part of the fiber layers 13a. Therefore, as in the case of the fiber-reinforced resin body 10 of the first aspect, even when stress acts on the outer peripheral portion of the hole 11 from multiple composite directions, the stress is borne by the reinforcing portion 62, so that the main fiber bundle It is possible to suppress damage to a part of the fiber layer 13a on the outer peripheral portion of the first through hole 11a formed by cutting 14a and 14b.

In particular, in the fiber-reinforced resin body 60 of the third aspect, since the reinforcing portion 62 is composed of the woven fabric 14g in which the wound fiber bundle 14e and the radial fiber bundle 14f are woven together, the winding portion included in the reinforcing portion 62 The strength of the fiber bundle 14e against the shear failure in the in-plane direction can be compensated, and the strength of the radial fiber bundle 14f also included in the reinforcing portion 62 can surely compensate the strength against the punch shear failure in the out-of-plane direction. In addition, it is possible to sufficiently exert the composite action effect of the wound fiber bundle 14e and the radial fiber bundle 14f, which is to bear the stress from the multiple directions acting on the outer peripheral portion of the hole 11.

(Fourth Embodiment)
Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

<Structure of Fiber Reinforced Resin Body of Fourth Aspect and Its Effect>
The configuration of the fiber-reinforced resin body of the fourth aspect will be described below. 9A is a plan view showing the fiber-reinforced resin body according to the fourth aspect, FIG. 9B is a bottom view showing the fiber-reinforced resin body according to the fourth aspect, and FIG. 9C is a fiber-reinforced resin body according to the fourth aspect. 9A and 9B are cross-sectional views of relevant parts showing a structure taken along line AA′ in FIGS. 9A and 9B.

As shown in FIGS. 9A to 9C, the fiber-reinforced resin body 70 of the fourth aspect is basically configured in the same manner as the fiber-reinforced resin body 10 of the first aspect, but in the outer peripheral portion of the hole portion 11. The fiber-reinforced resin body of the first aspect is different in that the connecting yarn 72 sewn in the stacking direction is provided for the plurality of fiber layers 13a to 13h. The connecting yarn 72 bundles and fixes the main fiber bundles 14a to 14d included in the fiber layers 13a to 13h and the wound fiber bundles 14e and the radial fiber bundles 14f included in the reinforcing portion 12 in the stacking direction. Hereinafter, the fiber-reinforced resin body 70 of the fourth aspect will be described in detail.

As shown in FIGS. 9A to 9C, in the fiber-reinforced resin body 70 of the fourth aspect, the connecting yarn 72 is sewn in the laminated eight layers of the fiber layers 13a to 13h along the laminating direction. ing. The connecting yarn 72 is arranged in a substantially annular shape along the peripheral edge of the hole 11 in a plan view.

Further, the connecting yarn 72 is arranged so as to overlap the reinforcing portion 12 in a plan view. Therefore, the connecting yarn 72 bundles and fixes the wound fiber bundle 14e and the radial fiber bundle 14f included in the reinforcing portion 12 in the stacking direction of the eight fiber layers 13a to 13h. Particularly, in the fiber-reinforced resin body 70 of the fourth aspect, as in the fiber-reinforced resin body 10 of the first aspect, other fiber layers except for the above-mentioned part of the fiber layers 13a and the like from the eight fiber layers 13a to 13h. 13 c and the like have a large diameter hole portion 17 and a reinforcing portion 12 arranged so as to be fitted into the large diameter hole portion 17. The reinforcing portion 12 is formed by laminating two substantially disc-shaped fiber layers, a first reinforcing portion 12a having a wound fiber bundle 14e and a second reinforcing portion 12b having a radial fiber bundle 14f. It is formed by. Therefore, the connecting yarn 72 fixes the first reinforcing portion 12a and the second reinforcing portion 12b in the stacking direction. The first reinforcing portion 12a and the second reinforcing portion 12b are adjacent to each other along the stacking direction.

In the fiber-reinforced resin body 70 of the fourth aspect, some of the connecting yarns 72 (fixed piece portions 72a and 72b described later) are arranged along the surfaces (upper surface and lower surface) P1 and P2 of the fiber-reinforced resin body 70, Further, it is arranged so as to overlap the reinforcing portion 12 in a plan view. Specifically, as shown in FIG. 9C, in the fiber-reinforced resin body 70 of the fourth aspect, the connecting yarn 72 has a plurality of fixing piece portions 72a and 72b and a plurality of connecting piece portions 72c, respectively. The fixed piece portion 72a is arranged along the upper surface P1 of the fiber-reinforced resin body 70, that is, the upper surface (first surface) P1 of the fiber layer 13a arranged on the upper side. The fixed piece portion 72b is arranged along the lower surface P2 of the fiber-reinforced resin body 70, that is, the lower surface (second surface) P2 of the fiber layer 13h arranged on the lower side. From the viewpoint of ease of sewing the connecting thread 72, the radial positions of the fixing pieces 72a and 72b are preferably 2 mm or more from the peripheral edge of the hole 11. Further, the length of the fixing pieces 72a and 72b in the circumferential direction is preferably 2 mm or more and 20 mm or less.

Further, the connecting piece portion 72c penetrates the fiber layers 13a to 13h along the stacking direction thereof, that is, along the thickness direction of the fiber-reinforced resin body 70. The fixed piece portion 72a and the fixed piece portion 72b are connected via a connecting piece portion 72c. In the fiber-reinforced resin body 70 of the fourth aspect, the fixing piece portions 72a, 72b and the connecting piece portion 72c are integrally formed as one connecting yarn 72.

Therefore, as shown in FIGS. 9A to 9C, the eight fiber layers 13a to 13h are fixed by the connecting yarn 72 in the stacking direction in the outer peripheral portion of the hole 11 in a plan view. More specifically, among the fiber layers 13a to 13h, the first reinforcing portion 12a and the second reinforcing portion 12b, which are included in some of the fiber layers 13a and the other fiber layers 13c, are fixed pieces in the stacking direction. It is sandwiched between the portion 72a and the fixed piece portion 72b, and is fixed by the connecting piece portion 72c that connects the fixed piece portion 72a and the fixed piece portion 72b.

The material of the connecting yarn 72 may be, for example, a fiber made of a thermoplastic resin, but is not particularly limited, and as will be described later, a plurality of fiber layers are fixed in the stacking direction to form the holes 11 Even if stress is concentrated on the outer peripheral portion, it is sufficient as long as it can prevent damage to the fiber layer on the outer peripheral portion. For example, use of fibers such as nylon, polyester, glass, aramid, polyphenylene sulfide, and polypropylene. You can The thickness of the connecting thread 72 is preferably 10 dtex or more and 500 dtex or less, and it is preferable to appropriately select it according to the size of the hole 11 and the lengths of the fixing pieces 72a and 72b. If the connecting thread 72 is thin, the thread breaks in the sewing process described in detail below, and if it is too thick, the fiber bundles 14a and 14b forming the fiber reinforced resin body 70 become more twisted, and the strength and rigidity of the fiber reinforced resin body 70 are increased. It may decrease.

The fiber-reinforced resin body 70 according to the fourth aspect has all the features of the fiber-reinforced resin body 10 according to the first aspect, as shown in FIGS. 9A to 9C. Therefore, even when a force is input to the fiber-reinforced resin body 70 of the fourth aspect and stress concentration occurs in the outer peripheral portion of the hole 11, the reinforcement portion 12 causes the stress to concentrate in the same manner as the fiber-reinforced resin body 10 of the first aspect. It is possible to suppress breakage of a part of the fiber layer 13a and the like existing on the outer peripheral portion of the hole 11 and increase the breaking strength of the fiber-reinforced resin body 30.

And the fiber reinforced resin body 70 of the 4th aspect WHEREIN: The connecting thread 72 (fixed) sewn in the lamination direction with respect to several fiber layers 13a-13h in the outer peripheral part of the hole 11 in planar view. Since the piece portions 72a, 72b and the connecting piece portion 72c) are provided and the main fiber bundles 14a to 14d and the fiber bundles 14e, 14f are fixed by the connecting yarn 72, a force is input to the fiber-reinforced resin body 70, Even when stress concentration occurs in the outer peripheral portion of the hole 11, delamination between the fiber layers 13a to 13h can be suppressed, and the fracture strength of the fiber-reinforced resin body 70 can be further increased.

Further, in the fiber-reinforced resin body 70 of the fourth aspect, the connecting yarn 72 is arranged so as to overlap the reinforcing portion 12 in a plan view, so that the connecting yarn 72 causes the other fiber layers 13c and the like to be included in the first portion. Since the reinforcing portion 12a and the second reinforcing portion 12b are fixed in the stacking direction, the strength of the first fiber layers 13c and 13f including the wound fiber bundle 14e against punching shear fracture, including the radial fiber bundle 14f. The second fiber layers 13d and 13e can be surely supplemented.

In addition, in the connecting yarn 72 of the fourth aspect, the case where all of the eight fiber layers 13a to 13h forming the fiber reinforced resin body 70 are fixed has been described as an example, but the connecting yarn 72 includes a plurality of fibers. It suffices that at least two of the layers 13a to 13h are arranged in at least two fiber layers, and either the main fiber bundles 14a to 14d or the fiber bundles 14e and 14f contained in the fiber layers are bundled and fixed in the stacking direction. .. For example, the fixed piece portion 72a is arranged along the upper surface of the first fiber layer 13c arranged on the upper side, and the fixed piece portion 72b is arranged on the lower surface of the first fiber layer 13f arranged on the lower side. When arranged in such a manner that the connecting yarn 72 is not exposed to the outside of the fiber reinforced resin body 70, and the connecting yarn 72 fixes the first reinforcing portion 12a and the second reinforcing portion 12b. You can

<The manufacturing method of the fiber-reinforced resin body of a 4th aspect>
Hereinafter, a method for manufacturing the fiber-reinforced resin body according to the fourth aspect will be described. The method for producing a fiber-reinforced resin body according to a fourth aspect is the same as the method for producing a fiber-reinforced resin body according to the first aspect shown in FIG. 3, for example, after the shaping step (S12) and the resin impregnation step (S13). The fourth aspect is different from the first aspect in that a sewing step to be described later is performed before. That is, the method for producing a fiber-reinforced resin body according to the fourth aspect includes a laminating step (S11), a shaping step (S12), a sewing step and a resin impregnating step (S13). To manufacture. Hereinafter, the sewing process will be described in detail.

In the sewing step in the method for producing the fiber-reinforced resin body according to the fourth aspect, the connecting yarn is provided along the laminating direction of the respective fiber sheets 83a to 83h forming the preform 18 formed by the shaping step (S12) described above. Sew in 72. Specifically, as shown in FIGS. 9A to 9C, the connecting yarn 72 is arranged on the upper surface (first surface) P1 of the preform 18 by a certain length. The portion arranged on the upper surface P1 of the preform 18 corresponds to the fixed piece portion 72a. After that, the connecting yarn 72 is passed through the inside of the preform 18 along the laminating direction of the respective fiber sheets 83a to 83h, and is put out from the lower surface (second surface) P2 of the preform 18. The portion embedded inside the preform 18 corresponds to the connecting piece portion 72c.

Then, the connecting yarn 72 is arranged on the lower surface P2 of the preform 18 by a certain length. The portion arranged on the lower surface P2 of the preform 18 corresponds to the fixed piece portion 72b. Then, the connecting yarn 72 is passed through the inside of the preform 18 along the laminating direction of the respective fiber sheets 83a to 83h, and is put out from the upper surface P1 of the preform 18. By repeating these, the connecting thread 72 is sewn into the preform 18. The connecting yarn 72 is arranged on the outer peripheral portion of the hole 11 formed in the preform 18 in a plan view. The above is the sewing process. After the sewing process, the resin impregnation process (S13) described above is performed to complete the fiber-reinforced resin body 70 of the fourth aspect.

It is important that the thickness of the object to be connected does not change during and after the sewing process so that the sewn connecting thread 72 is not loosened. Therefore, it is desirable to use the preform 18 obtained through the shaping step of pressing each of the fiber sheets 83a to 83h as an article to be connected, and then perform the sewing step.

(Example)
Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

<Example 1>
As Example 1, a test piece 10a made of the fiber-reinforced resin body 10 of the first aspect having the configuration shown in FIGS. 1A to 1D was prepared and subjected to a shear strength test described in detail below. The following materials were used for each component of the test piece 10a. As the carbon fiber, T800 manufactured by Toray was used. As the fiber sheets 83a to 83h forming the fiber layers 13a to 13h, Toray T800 unidirectional carbon fiber sheets were used. The size of the test piece 10a was 25 mm width×100 mm length×1.28 mm thickness. As a binder material to be attached to the fiber sheets 83a to 83h, a polyamide-based hot melt adhesive, Griltex2AP manufactured by EMS, was used. A Nissin resin Z1 epoxy resin containing a curing agent was used as the resin 15 constituting the test piece 10a. Using the above materials, a test piece 10a having a carbon fiber content rate of 57 volume% made of the fiber-reinforced resin body 10 of the first aspect was produced according to the method for manufacturing a fiber-reinforced resin body described with reference to FIG.

[Lamination process]
As shown in FIG. 3, the fibrous sheets 83h, 83g,... 83a are laminated in this order from below on the mold K, and the first reinforcing portion sheet 82a and the second reinforcing portion sheet 82b are provided in a predetermined manner. Placed in position. Here, the orientation direction of 0° means the tensile direction (longitudinal direction of the test piece 10a) of the shear strength test corresponding to the acting direction H of the shear stress shown in FIG. 10A which is a schematic view of the shear strength test. Point to. Therefore, the orientation directions of the fiber directions of the main fiber bundles constituting the laminated fiber sheets 83a to 83h are 45°, −45°, 0°, 90°, 90°, 0°, −45°, 45 from the top. It becomes °. The inner diameter D1 of the first through hole 11a of each of the third fiber layer sheets 83a and 83h and the fourth fiber layer sheets 83b and 83g was 8 mm. Further, each large diameter hole portion 17 (inner diameter D2: 16 mm) of each of the first fiber layer sheets 83c and 83f and the second fiber layer sheets 83d and 83e has a second through hole 11b having an inner diameter D1: 8 mm. An outer ring-shaped first reinforcing portion sheet 82a and second reinforcing portion sheet 82b having an outer diameter D2 of 16 mm were arranged.

[Shaping process]
The fiber sheets 83a to 83h laminated by the above laminating step are sandwiched between the mold K and its lid K2, and pressure-bonded by a hydraulic press at 140° C. for 5 minutes at a pressure of 0.5 MPa to obtain a preform. 18 was formed.

[Resin impregnation process]
The preform 18 formed by the above shaping step is impregnated with the resin 15 by infusion molding, and then the impregnated resin 15 is cured, and the central portion has a hole portion 11 with a diameter of 8 mm and a width of 25 mm×length. Five test pieces 10a for the shear strength test, which were made of the fiber-reinforced resin body 10 having a thickness of 100 mm and a thickness of 1.28 mm, were obtained. In addition, for the punching shear strength test, the same process as that for the test piece 10a is performed, and the fiber-reinforced resin body 10 has a width of 50 mm, a length of 50 mm, and a thickness of 1.28 mm and has a hole 11 having a diameter of 11 mm at the center. 5 pieces of the test piece 10b were obtained.

[Shear strength test]
The shear strength of the five prepared test pieces 10a was evaluated by the shear strength test (double lap test) shown in FIG. 10A. Specifically, as shown in FIG. 10A, the end of the test piece 10a was sandwiched between two aluminum plates 90 made of JIS-AC4CH having the same shape as the test piece 10a made of the fiber-reinforced resin body 10. .. The length of the aluminum plate 90 and the lap portion I of the test piece 10a was 25 mm, and the hole 11 of the test piece 10a and the hole 91 of the aluminum plate 90 were substantially in the center of the lap portion I. Then, in the lap portion I of the two aluminum plates 90 and the test piece 10a, the hole portion 91 of the two aluminum plates 90 and the hole portion 11 of the test piece 10a are arranged so as to overlap each other in plan view, and then the hole portion is formed. The metal collar 93 was inserted into the hole 11 and the hole 91, and the bolt 92 was inserted into the metal collar 93. The bolt 92 was fixedly engaged with the nut 95 via a washer (washer) 94. The material of the metal collar 93 is S45C, and the materials of the bolt 92, the washer 94, and the nut 95 are SUS304. The bolt 92 was M6 and was tightened with a torque of 9 N·m. Then, the test piece 10a and the aluminum plate 90 are chucked in the tester, and the aluminum plate 90 is fixed, and the test piece 10a is 1 mm/minute along the longitudinal direction H as shown by an arrow G in the figure. The load at break was measured for each of the five test pieces 10a by pulling at the test speed, and the average value of the surface pressure stress (shear stress) at break of the five test pieces 10a was obtained.

[Punching shear strength test]
The punching shear strength of the five test pieces 10b was evaluated. The punching shear strength was evaluated by conducting a test in accordance with JIS K7214 "Plastic punching shear test method", as shown in FIG. 11A. Specifically, in the punching shear strength test, as shown in FIG. 11A, the shaft portion of the punch 102 is inserted into the hole portion of the test piece 10b sandwiched and fixed between the upper and lower dies 101, and the punch 102 is attached to the washer 103. After fixing with the nut 104 and the punch 104, the punch 102 is punched downward at a speed of 1 mm/min to give a shear to the test piece 10b, and the load at break is applied to each of the five test pieces 10b. Was measured, and the average value of the punching shear stress at the time of breaking of the five test pieces 10b was obtained. The punching shear strength test was conducted only in Example 1 and Comparative Example 1 described below.

<Example 2>
As Example 2, a test piece 10a including the fiber-reinforced resin body 20 of Modification 1 shown in FIGS. 5A to 5D was produced. That is, in Example 2, in the laminating step, the orientation directions of the main fiber bundles constituting the laminated fiber sheet were 45°, −45°, 45°, −45°, −45°, 45° from the top. Eight layers of fiber layers 23a to 23h were formed by laminating at −45° and 45°. Since the other points of the second embodiment are the same as those of the first embodiment, the description thereof will be omitted.

<Example 3>
As Example 3, a test piece 10a made of the fiber-reinforced resin body 30 of Modification 2 shown in FIGS. 6A and 6B was produced. That is, in Example 3, in the laminating step, the orientation directions of the main fiber bundles constituting the laminated fiber sheet were 0°, 90°, 0°, 90°, 90°, 0°, 90° from above. It laminated|stacked so that it might become 0 degree, and formed eight fiber layers 33a-33h. Since the other points of the third embodiment are the same as those of the first embodiment, the description thereof will be omitted.

<Comparative example>
Five test pieces of Comparative Examples 1 to 3 produced in the same manner as the test piece 10a of Examples 1 to 3 except that the reinforcing portion 12 was not provided were subjected to the shear strength test. .. Further, five test pieces of Comparative Example 1 produced in the same manner as the test piece 10b of Example 1 except that the reinforcing portion 12 was not provided were subjected to the punching shear strength test.

<Test results>
FIG. 10B is a diagram showing the results of the shear strength test. FIG. 10B is a graph showing a value obtained by normalizing the average value of the surface pressure stress at break of the five test pieces 10 a of Examples 1 to 3 and Comparative Examples 1 to 3 with the average value of Comparative Example 2. As shown in FIG. 10B, when the average value of shear stress at break of Comparative Example 2 is 1.0, the average value of shear stress at break of Comparative Example 1 is 2.0, and Comparative Example 3 The average value of the shear stress at break was 1.0. On the other hand, the average value of shear stress at break of Example 1 is 2.3, the average value of shear stress at break of Example 2 is 1.7, and the average value of shear stress at break of Example 3 is The average value was 2.0.

FIG. 11B is a diagram showing the results of the punching shear strength test. 11B is a graph showing a value obtained by normalizing the average value of stresses at break of the five test pieces 10b of Example 1 and Comparative Example 1 by the average value of Comparative Example 1. FIG. As shown in FIG. 11B, when the average stress at break of Comparative Example 1 was set to 1.0, the average stress at break of Example 1 was 1.3.

From the above results, it was shown that the test pieces of the examples to which the configuration of the fiber-reinforced resin body according to the present invention was applied had higher fracture strengths than the test pieces of the comparative example which were not applied.

The present invention is not limited to the above-described embodiments and examples, and various modifications can be made without departing from the spirit of the invention.

1 Vehicle Wheel 3 Disk Part 3a Hub Part 3b Spoke Part 3c Female Thread Part 5 Rim Part 5a Flange Part 5b Bead Seat Part 5c Hump Part 5d Drop Part 5e Hump Part 5f Bead Seat Part 5g Flange Part 5h Coupling Part 7 Mechanical Fastening Means 9a, 9b, 9c, 9d, 9e Resin portion 10, 20, 30, 50, 60, 70 Fiber reinforced resin body 10a, 10b Test piece 11 Hole portion 11a, 51c First through hole 11b, 51b Second through hole 12 , 52, 62 Reinforcing portions 12a, 52a First reinforcing portions 12b, 52b Second reinforcing portions 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h, 23a, 23b, 23c, 23d, 23e, 23f, 23g, 23h, 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 53a, 53b, 53c, 53d, 53e, 53f, 53g, 53h Fiber layers 14a, 14b, 14c, 14d Fiber bundle 14e Wound fiber bundle 14f Radial fiber bundle 14g Woven fabric 15 Resin 17,57 Large diameter hole 18 Preform 72 Connecting yarn 72a, 72b Fixed piece 72c Connecting piece 82a, 82b, 83a, 83b, 83c, 83d, 83e, 83f, 83g, 83h Fiber sheet 90 Aluminum plate 91 Hole 92 Bolt 93 Metal collar 94, 103 Washer 95, 104 Nut 101 Die 102 Punch I Wrap K Mold K1 Protrusion K2 Lid K3 Spring P1 Upper surface P2 Lower surface

Claims (17)

A fiber reinforced resin body having a plurality of laminated fiber layers,
The plurality of fiber layers includes oriented main fiber bundles,
A part of the plurality of fiber layers penetrates in the laminating direction thereof and has a first through hole formed so as to cut the main fiber bundle,
At least one fiber layer of the other fiber layers excluding the part of the fiber layers from the plurality of fiber layers has a large-diameter hole portion having a larger diameter than the first through hole, and the large-diameter hole portion. Has a reinforcing portion arranged so as to fit to the inner periphery of the
The reinforcing portion has a second through hole penetrating the reinforcing portion,
The first through hole formed in the part of the fiber layer and the second through hole formed in the reinforcing portion communicate with each other to form one hole portion, and the hole portion is a mechanical fastening means. Is configured to be inserted,
The fiber-reinforced resin body, wherein the reinforcing portion includes a fiber bundle oriented so as to be wound around the central axis of the second through hole. The fiber-reinforced resin body according to claim 1,
The reinforcing portion includes a fiber bundle that is radially oriented from the center of the second through hole, instead of the fiber bundle that is oriented so as to be wound around the central axis of the second through hole. Fiber reinforced resin body. The fiber-reinforced resin body according to claim 1,
The reinforcing portion further includes a fiber bundle radially oriented from the center of the second through hole. The fiber-reinforced resin body according to claim 3,
The reinforcing portion includes a first reinforcing portion made of a fiber bundle oriented so as to be wound around the central axis of the second through hole, and a fiber bundle radially oriented from the center of the second through hole. And a second reinforcing portion,
The said other fiber layer has the fiber layer in which the said 1st reinforcement part was arrange|positioned, and the fiber layer in which the said 2nd reinforcement part was arrange|positioned, The fiber-reinforced resin body characterized by the above-mentioned. The fiber-reinforced resin body according to claim 4,
The fiber reinforced resin body, wherein the first reinforcing portion and the second reinforcing portion are adjacent to each other in the stacking direction. The fiber-reinforced resin body according to claim 4,
The fiber bundle radially oriented from the center of the second through hole has a tangential line of the fiber bundle at an intersection with the fiber bundle oriented so as to be wound around the central axis of the second through hole in a plan view. A fiber-reinforced resin body characterized by being substantially orthogonal to. The fiber-reinforced resin body according to any one of claims 1 to 6,
A first fiber layer having a fiber bundle aligned in a direction along a principal axis of shear stress among stresses acting on the hole in a plan view;
A second fiber layer having a fiber bundle aligned in a direction substantially orthogonal to the fiber bundle of the first fiber layer;
A third fiber layer having a fiber bundle aligned in a direction intersecting with any fiber bundle included in the first fiber layer and the second fiber layer;
A fourth fiber layer having a fiber bundle aligned in a direction intersecting with any fiber bundle included in the first fiber layer, the second fiber layer and the third fiber layer is laminated. Characteristic fiber reinforced resin body. The fiber-reinforced resin body according to any one of claims 4 to 6,
A first fiber layer having a fiber bundle aligned in a direction along a principal axis of shear stress among stresses acting on the hole in a plan view;
A second fiber layer having a fiber bundle aligned in a direction substantially orthogonal to the fiber bundle of the first fiber layer;
A third fiber layer having a fiber bundle aligned in a direction intersecting with any fiber bundle included in the first fiber layer and the second fiber layer;
A first fiber layer, a second fiber layer and a fourth fiber layer having a fiber bundle aligned in a direction intersecting with any fiber bundle included in the third fiber layer is laminated,
The first fiber layer includes the first reinforcing portion,
The said 2nd fiber layer contains the said 2nd reinforcement part, The fiber reinforced resin body characterized by the above-mentioned. The fiber-reinforced resin body according to any one of claims 7 and 8,
The first fiber layer and the second fiber layer are adjacent to each other along the stacking direction,
The fiber-reinforced resin body, wherein the third fiber layer and the fourth fiber layer are adjacent to each other in the stacking direction. The fiber-reinforced resin body according to any one of claims 7 to 9,
The fiber reinforced resin body, wherein the third fiber layer and the fourth fiber layer are arranged on a front portion of the fiber reinforced resin body. The fiber-reinforced resin body according to any one of claims 1 to 10,
On the outer peripheral portion of the hole portion, a connecting thread sewn in the laminating direction with respect to two or more fiber layers of the plurality of fiber layers is provided.
The connecting yarn bundles and fixes the main fiber bundles contained in the part of the fiber layers and/or the fiber bundles contained in the reinforcing portion in the stacking direction and is fixed. .. The fiber-reinforced resin body according to any one of claims 3 to 10,
On the outer peripheral portion of the hole portion, a connecting thread sewn in the laminating direction with respect to two or more fiber layers of the plurality of fiber layers is provided.
The connecting yarn bundles and fixes a fiber bundle oriented so as to be wound around the central axis of the second through hole and a fiber bundle radially oriented from the center of the second through hole in the stacking direction. A fiber-reinforced resin body characterized in that The fiber-reinforced resin body according to any one of claims 11 and 12,
The fiber-reinforced resin body is characterized in that a part of the connecting yarn is arranged along a surface of the fiber-reinforced resin body and is arranged so as to overlap the reinforcing portion in a plan view. The fiber-reinforced resin body according to any one of claims 1 to 13,
The fiber-reinforced resin body, wherein the reinforcing portion is not exposed on the surface of the fiber-reinforced resin body. The fiber-reinforced resin body according to any one of claims 1 to 14,
The fiber-reinforced resin body, wherein the reinforcing portion is arranged along a part of a peripheral edge of the hole portion in a plan view. The fiber-reinforced resin body according to any one of claims 1 to 14,
The fiber reinforced resin body, wherein the reinforcing portion is arranged over the entire circumference of the peripheral edge of the hole portion in a plan view. The fiber-reinforced resin body according to claim 3,
The reinforcing portion is formed by weaving a fiber bundle oriented so as to be wound around the central axis of the second through hole and a fiber bundle radially oriented from the center of the second through hole. A fiber-reinforced resin body characterized in that

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