JP6640575B2 - Composite structure - Google Patents

Description

  The present invention relates to a composite structure formed using a fiber reinforced resin.

  BACKGROUND ART In recent years, three-dimensional structural members made of a fiber reinforced resin such as a carbon fiber reinforced resin (CFRP) have been used as structural members constituting a structural body such as an automobile body. The structural member made of fiber reinforced resin can reduce the weight of the structural member as compared with a metal structural member. The structure made of fiber reinforced resin is, for example, a fiber reinforced resin laminate obtained by laminating a fiber reinforced resin sheet in which reinforced fibers are impregnated with a thermosetting matrix resin, heated and pressed using an autoclave device, and the matrix resin It is manufactured by curing.

  Here, the structural member may be provided with a hole into which a connector or the like is inserted. For example, Patent Literature 1 discloses a resin arm made of fiber reinforced resin provided with a mounting portion of a joint device at an axial end. The shaft portion of the resin arm is manufactured by cutting a long material obtained by a continuous pultrusion method using a molten resin material containing a long fiber as a reinforcing fiber into an appropriate length. Further, the cylindrical portion as a mounting portion of the resin arm is manufactured by filling a molten resin material containing short fibers as reinforcing fibers into a molding cavity formed by a molding die and solidifying by cooling. You.

JP-A-10-272707

  However, although the resin arm described in Patent Literature 1 is manufactured using a fiber reinforced resin, the tubular portion is formed of a molten resin material containing short fibers, and is similar to a suspension arm. However, the rigidity and strength are not sufficient for components requiring high rigidity and strength. Further, as a method of increasing the strength of the hole while maintaining the effect of weight reduction by using the fiber reinforced resin, it is conceivable to use a metal member in the hole. However, in this case, it is necessary to secure the rigidity and strength of the composite structure by strengthening the connection between the fiber reinforced resin and the metal member.

  Therefore, the present invention has been made in view of the above-described problem, and an object of the present invention is to provide a structure, in which a hole of a structure made of fiber-reinforced resin is formed using a metal member. It is an object of the present invention to provide a new and improved composite structure capable of securing the rigidity and strength of the composite structure.

In order to solve the above problems, according to an aspect of the present invention, there is provided a composite structure including an arm portion having a hole at a tip portion, the composite structure being configured using a fiber reinforced resin including a reinforcing fiber, The metal member includes: a cylindrical portion having an opening that forms a hole; and an extending portion connected to the outer periphery of the cylindrical portion and extending from the base side of the arm portion to the distal end side. Is embedded in a fiber reinforced resin.

  The fiber reinforced resin covering the cylindrical portion may include continuous fibers arranged along the peripheral surface of the cylindrical portion.

  The extending portion may have a curved portion or a bent portion.

  The composite structure may be a suspension arm for a vehicle.

  As described above, according to the present invention, the rigidity and strength of the structure can be ensured while the holes of the structure made of the fiber-reinforced resin are formed using metal members.

FIG. 2 is a schematic diagram illustrating a suspension device provided with a lower arm as an example of a composite structure. It is an explanatory view showing a suspension device. FIG. 2 is a perspective view showing a composite structure (lower arm) according to the embodiment of the present invention. It is explanatory drawing which shows the manufacturing method of the composite structure concerning the embodiment. It is explanatory drawing which shows the manufacturing method of the composite structure concerning the embodiment. It is explanatory drawing which shows the manufacturing method of the composite structure concerning the embodiment. It is a perspective view showing an example of a metal member.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. Further, in this specification and the drawings, a plurality of components having substantially the same function and configuration may be distinguished from each other by adding different alphabets after the same reference numeral. However, when it is not necessary to particularly distinguish each of a plurality of components having substantially the same functional configuration, only the same reference numeral is assigned.

<1. Composite Structure>
(1-1. Outline of Lower Arm)
First, a lower arm (suspension arm) 20 as an example of a composite structure according to the present embodiment will be described with reference to FIGS. FIG. 1 is a schematic diagram for explaining a configuration example of a suspension device 100 for a front wheel of a vehicle including a lower arm 20. FIG. 2 is an exploded perspective view of the lower arm 20 and a suspension cross member 108.

  In the suspension device 100, the right and left sides of the engine room 102 are partitioned by a front wheel apron 103 which is a component of the vehicle body frame. The front wheel apron 103 is joined to a pair of left and right side frames 105 extending in the front-rear direction of the vehicle body. A strut tower 106 is formed at the rear of the front wheel apron 103. The strut tower 106 houses a strut type suspension 107. The upper part of the suspension 107 is supported by a strut support part 106a formed on the upper part of the strut tower 106 via a strut upper mount 107a.

  A suspension cross member 108 is provided below the engine room 102. The upper surfaces at both ends in the vehicle width direction of the suspension cross member 108 are fixed to the side frames 105 via fasteners such as bolts and nuts. On the upper surface of the suspension cross member 108, a rear portion of an engine (not shown) is mounted via an engine mount. On the lower surface of both ends of the suspension cross member 108 in the vehicle width direction, arm support portions 109 are protruded. Each of the left and right arm support portions 109 is provided with a pair of brackets 109a, 109b facing each other at predetermined intervals in front, rear, left and right, and each bracket 109a, 109b is provided with a bolt insertion hole 109c. A cylindrical first base 21 provided at one base end of the lower arm 20 is disposed between the brackets 109a and 109b.

  The lower arm 20 is substantially continuous from the first base portion 21 serving as one base end to the distal end portion 23, and is branched from the central portion and extends rearward to be connected to the second base portion 22 serving as the other base end. It has a T-shaped or L-shaped planar shape. A bush (not shown) is press-fitted into the first base 21 of the lower arm 20. The shaft of a bolt 112 inserted from the outside into a bolt insertion hole 109c formed in the brackets 109a and 109b passes through the bush, and the shaft of the bolt 112 is fastened by a nut 113.

  A bush (not shown) is press-fitted into the second base 22. The second base 22 is pivotally supported on the side frame 105 via a bush. Further, a bush (not shown) is press-fitted into the tip portion 23 serving as the swing end. The tip portion 23 is connected to a ball joint (not shown) via a bush, and a wheel hub (not shown) for fixing the front wheel 111 is rotatably supported. Thus, the lower arm 20 supports the lower portion of the suspension 107 via a hub housing (not shown), and is swingably supported by the suspension cross member 108 and the side frame 105.

(1-2. Configuration Example of Lower Arm)
Next, a configuration example of the lower arm 20 as the composite structure according to the present embodiment will be described in detail. FIG. 3 is a perspective view illustrating an example of the lower arm 20. The lower arm 20 has a substantially T-shaped or L-shaped planar shape, and includes a first base 21 connected to the suspension cross member 108, a second base 22 connected to the side frame 105, and a ball joint. Are connected to each other and have a tip portion 23 which is a swing end. The lower arm 20 is arranged in the holes 18a, 19b, and 19c provided in the main body 18, the first base 21, the second base 22, and the tip 23, and the holes 19a, 19b, and 19c. Cylindrical members 27, 28, 29. The first base 21, the second base 22, and the distal end 23 are provided on the distal ends of the arms 25a, 25b, and 25c, respectively.

  The main body 18 is formed using, for example, a fiber-reinforced resin sheet containing continuous fibers. The fiber reinforced resin sheet containing continuous fibers is formed by impregnating continuous fibers with a matrix resin. The main body 18 is composed of a first half 18a and a second half 18b joined to each other. The first half 18a and the second half 18b are joined at a joining surface along a plane passing through the first base 21, the second base 22, and the tip 23. The first half 18a and the second half 18b are each formed using a fiber-reinforced resin sheet containing continuous fibers. The method of joining the first half 18a and the second half 18b is not particularly limited, and various methods may be employed, including joining with an adhesive, vibration fusion bonding, and hot fusion bonding. Can be.

  As the continuous fiber to be used, for example, a carbon fiber may be mentioned, but other fibers may be used, or a plurality of fibers may be used in combination. However, since carbon fibers have excellent mechanical properties, it is preferable that the reinforcing fibers include carbon fibers.

  As the matrix resin of the fiber-reinforced resin, a thermoplastic resin or a thermosetting resin is used. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polyvinyl chloride resin, ABS resin, polystyrene resin, AS resin, polyamide resin, polyacetal resin, polycarbonate resin, thermoplastic polyester resin, PPS (polyphenylene sulfide) resin, and fluorine. Examples thereof include a resin, a polyetherimide resin, a polyetherketone resin, and a polyimide resin.

  As the matrix resin, one of these thermoplastic resins or a mixture of two or more thereof can be used. Alternatively, the matrix resin may be a copolymer of these thermoplastic resins. When the matrix resin is a mixture of these thermoplastic resins, a compatibilizer may be used in combination. Further, the matrix resin may contain a bromine-based flame retardant as a flame retardant, a silicon-based flame retardant, red phosphorus, or the like.

  In this case, as the thermoplastic resin used, for example, polyethylene, a polyolefin resin such as polypropylene, a polyamide resin such as nylon 6, nylon 66, a polyethylene resin such as polyethylene terephthalate and polybutylene terephthalate, a polyether ketone, Resins such as polyethersulfone and aromatic polyamide are exemplified. Among them, it is preferable that the thermoplastic matrix resin is at least one selected from the group consisting of polyamide, polyphenylene sulfide, polypropylene, polyetheretherketone, and phenoxy resin.

  Examples of the thermosetting resin that can be used as the matrix resin include an epoxy resin, an unsaturated polyester resin, a vinyl ester resin, a phenol resin, a polyurethane resin, and a silicone resin. One or a mixture of two or more of these thermosetting resins can be used as the matrix resin. When using these thermosetting resins for the matrix resin, an appropriate curing agent or reaction accelerator may be added to the thermosetting resin.

  A bush is press-fitted into the cylindrical members 27, 28, 29. Therefore, as the cylindrical members 27, 28, 29, for example, metal cylindrical members are used. Examples of metals that can be used include, but are not limited to, stainless steel, cast iron, titanium, titanium alloys, and the like. The cylindrical members 28 and 29 disposed on the second base 22 and the distal end 23 join the first half 18a and the second half 18b, and are press-fitted after forming the holes 19b and 19c. Good. Alternatively, the cylindrical members 28 and 29 disposed on the second base portion 22 and the distal end portion 23 form holes 19b and 19c in the first half 18a and the second half 18b, respectively, so that the first half is formed. After joining the body 18a and the second half 18b, they may be press-fitted.

  The cylindrical member 27 disposed on the first base 21 is made of metal, and is embedded in a fiber reinforced resin which is one of the components of the arm 25a. FIG. 7 is a perspective view illustrating an example of a cylindrical member (hereinafter, also referred to as a “metal member”) 27. The illustrated metal member 27 has a cylindrical portion 27a having an opening 21 ', and an extending portion 27b connected to the outer peripheral portion of the cylindrical portion 27a. The extension 27b is arranged along the arm 25a. Therefore, the metal member 27 embedded in the fiber reinforced resin comes into contact with the fiber reinforced resin as a constituent material of the main body 18 on the outer peripheral surface of the cylindrical portion 27a and the surface of the extending portion 27b. Thereby, the contact area between the metal member 27 made of metal and the fiber reinforced resin is increased, and the rigidity and strength of the arm portion 25a are increased. Further, since the metal member 27 is embedded in the fiber-reinforced resin not only at the cylindrical portion 27a but also at the portion of the extension portion 27b arranged along the arm portion 25a, for example, from the lateral direction with respect to the arm portion 25a. It can withstand the applied load.

  Further, in the metal member 27 shown in FIG. 7, the extending portion 27b has a curved portion 27bb. Accordingly, when the lengths of the extending portions 27b along the extending direction are equal, the surface area of the extending portions 27b increases, and the contact area with the fiber reinforced resin increases. In addition, since the curved portion 27bb is embedded in the fiber reinforced resin, the metal member 27 is less likely to come off from the fiber reinforced resin. Therefore, the rigidity and strength of the arm 25a are further enhanced. Note that a bent portion may be provided instead of the curved portion 27bb, and further, a step portion such as a protrusion may be provided. Further, the number of the extending portions 27b is not limited to one, and a plurality of extending portions 27b may be provided.

  The metal member 27 may be, for example, a member in which a cylindrical portion 27a and an extending portion 27b are integrally formed. Specifically, a member in which the metal member 27 is integrally formed by forging, casting, molding, or the like can be used. Thereby, the unevenness on the surface of the connecting portion between the cylindrical portion 27a and the extending portion 27b can be reduced, and the bonding with the fiber reinforced resin can be strengthened. However, the cylindrical portion 27a and the extending portion 27b may be joined by, for example, welding. In this case, at least a part of one end of the extending portion 27b may be inserted and joined to a concave portion or a hole formed on the outer peripheral surface of the cylindrical portion 27a.

  The metal member 27 forms a half of the hole 19a and the arm 25a in each of the first half 18a and the second half 18b, and forms the first half 18a and the second half 18b. At the time of joining, the metal member 27 may be sandwiched between the half portions and joined. At this time, since the inner surfaces of the first half 18a and the second half 18b to which the metal member 27 is joined are not surfaces formed by the molding surface of the molding die 40, the metal members 27 are cut by cutting or the like. The metal member 27 may be joined after forming the inner surface corresponding to the outer shape of.

  In the lower arm 20 configured as described above, the cylindrical portion 27a of the metal member 27 disposed on the first cylindrical base 21 has a central axis substantially coincident with the front-rear direction of the vehicle. Allows swinging direction. Further, the cylindrical member 28 disposed on the second base 22 has a center axis substantially in the vertical direction, and enables the tip 23 to swing in the horizontal direction. Since a load or vibration applied to the vehicle body is transmitted to the lower arm 20, a large load may be generated on each of the first base 21, the second base 22, and the tip 23. Therefore, the first base 21, the second base 22, and the distal end 23 are required to have high rigidity and strength. For this reason, in the lower arm 20 according to the present embodiment, the metal member 27 is embedded in the fiber reinforced resin, the continuous fibers are arranged around the holes 19b, 19c, and the strength of the holes 19b, 19c is increased. I have.

<2. Manufacturing method of composite structure>
Next, an example of a method for manufacturing a composite structure according to the present embodiment will be described. Here, bagging is performed after laminating a fiber reinforced resin sheet in which a matrix resin is impregnated with a reinforcing fiber on a molding die. Then, an example of a method of manufacturing the lower arm 20 to which the metal member 27 or the cylindrical members 28 and 29 are attached while the main body is formed by curing the laminate of the fiber reinforced resin will be described.

The method for manufacturing a composite structure according to the present embodiment includes the following steps.
・ Prepreg cutting process ・ Lamination process ・ Bagging process ・ Molding process ・ Implant and joining process ・ Punching process

  Hereinafter, a method of manufacturing the composite structure illustrated in FIG. 3 will be described in the order of steps with reference to FIGS. 4 to 7 as appropriate. 4 to 6 are explanatory diagrams illustrating the flow of the method of manufacturing the lower arm 20 according to the present embodiment.

(2-1. Pre-preg cutting step)
As shown in FIG. 4, in the prepreg cutting step, the fiber reinforced resin sheet 5 having a predetermined width is cut into a size or a length suitable for the fiber reinforced resin structure to be manufactured, and the prepreg 12 is produced. . The shape of the prepreg 12 can be made to substantially match the expanded shape of the main body 18, and in this case, the dimensions of the prepreg 12 may be larger than the outer shape of the main body 18.

  The fiber-reinforced resin sheet 5 containing continuous fibers is produced by impregnating the matrix fibers with the matrix resin while continuously sending out the reinforcing fibers by, for example, a known film impregnation method or a melt impregnation method. The fiber reinforced resin sheet 5 is appropriately cut to prepare a prepreg 12 having a desired planar shape. The thickness of one fiber reinforced resin sheet 5 or prepreg 12 can be, for example, a value within a range of 0.03 to 1.0 mm.

(2-2. Lamination process)
As shown in FIG. 5, in the laminating step, a plurality of prepregs 12 are laminated to produce a fiber-reinforced resin laminate 14. The prepreg 12 is, for example, laminated on the molding surface of the molding die 40. The number of prepregs 12 to be laminated is not particularly limited, and can be selected according to the use of the composite structure to be manufactured. For example, three to six prepregs 12 can be laminated. At this time, the prepregs 12 may be laminated by aligning the orientation direction of the continuous fibers in one direction to produce the fiber-reinforced resin laminate 14. Thus, the strength of the manufactured lower arm 20 in a specific direction along the orientation direction of the continuous fibers can be increased. Alternatively, the fiber-reinforced resin laminate 14 may be produced by laminating some or all of the prepregs 12 in different orientations of the continuous fibers. Thus, the strength of the manufactured lower arm 20 can be made anisotropic.

  When the fiber-reinforced resin laminate 14 is formed by laminating a plurality of prepregs 12, the types and the content of the reinforcing fibers contained in the respective fiber-reinforced resin sheets may be different. Further, in a plurality of fiber reinforced resin sheets to be laminated, the matrix resin may be a different material having compatibility, or a different additive may be mixed with the same matrix resin. Good. Also in this case, a matrix resin having a similar melting point may be used so that the fiber-reinforced resin laminate 14 can be efficiently melted and cured.

  Here, when the prepreg 12 is laminated in the laminating step, at least the extending direction of the arm 25a is located on the distal end side including the portion corresponding to the hole 19a in the arm 25a where the first base 21 is formed. May be laminated so that the continuous fibers are arranged along. Thereby, the continuity of the fiber of the part corresponding to the root side of the arm part 25a and the hole part 19a is ensured, and rigidity and strength can be improved. When the continuous fibers are arranged in this manner, the continuous fibers are arranged along the circumferential direction of the hole 19a, that is, along the circumferential direction of the cylindrical portion 27a of the metal member 27 to be embedded later. The strength of the hole 19a can be increased.

  At this time, a continuous fiber reinforcing sheet made of a fiber reinforced resin sheet (UD (Uni-Directional) material) containing continuous fibers oriented in one direction is applied to a portion corresponding to the holes 19b and 19c (hereinafter referred to as a “scheduled portion to be opened”). "). Thereby, the continuity of the fibers around the holes 19b and 19c is maintained even after the perforation process is performed, and the rigidity and strength around the holes 19b and 19c can be prevented from lowering. The continuous fiber reinforced sheet can be formed by cutting the above-described fiber reinforced resin sheet 5 (see FIG. 4) into a predetermined length and width. That is, the thickness of the continuous fiber reinforced sheet may be the same as the thickness of the prepreg 12. The number of continuous fiber reinforced sheets to be arranged is not particularly limited.

(2-3. Bagging process)
As shown in FIG. 5, in the bagging step, for example, a rubber bag 31 is placed on the fiber-reinforced resin laminate 14 arranged on the molding die 40, and the bag 31 and the molding die 40 are clamped. . The mold 40 may be, for example, a mold or a mold made of fiber reinforced resin. The bag 31 may be a bag made of a deformable material, and is not limited to a rubber bag. However, both the mold 40 and the bag 31 are made of a material that can withstand heat treatment using an autoclave device in a later step. By this bagging, at least the molding space 33 formed by the molding die 40 and the bag 31 is made airtight.

(2-4. Forming process)
As shown in FIG. 5, in the forming step, the bagged fiber-reinforced resin laminate 14 is charged into an autoclave device. The autoclave device is a device that performs a heat treatment while keeping the inside of the kettle at a high pressure. After the fiber reinforced resin laminate 14 is put into the autoclave, the air in the molding space 33 is sucked by the pump 35 or the like, and the inside of the molding space 33 is evacuated. Thereby, the fiber-reinforced resin laminate 14 is heated under pressure and cured while the air in the prepreg 12 is deaerated. Thereby, the first half 18a constituting the main body 18 is formed. By heating under pressure while keeping the inside of the molding space 33 in a vacuum state, the porosity of the first half 18a to be molded can be reduced, and the mechanical strength of the first half 18a can be increased. Can be. Further, since the inside of the molding space 33 is evacuated, the surface opposite to the surface in contact with the molding die 40 also has a relatively clean finish.

  The second half 18b is also formed by the same procedure as the prepreg cutting step, the laminating step, the bagging step, and the forming step described above.

(2-5. Drilling step)
As shown in FIG. 6, in the drilling step, drilling is performed on portions of the first half 18 a and the second half 18 b to be drilled at the second base 22 and the tip 23, respectively. Thus, holes 19b and 19c are formed. FIG. 6 shows a state in which holes 19b and 19c are formed in the first half 18a. Holes 19b and 19c are similarly formed in the second half 18b. The hole punching processing can employ water jet processing, laser processing, or drilling processing using a tool such as a drill or an end mill. However, the drilling is not limited to such an example.

(2-6. Implant / joining process)
As shown in FIG. 6, in the implant / joining step, the first half 18a and the second half 18b are joined to form the main body 18. The joining method is not particularly limited, and various methods can be adopted, such as joining with an adhesive, vibration fusion bonding, and hot fusion compression bonding. In the example of the method of manufacturing the lower arm 20 according to the present embodiment, the hole 19a of the first base 21 is formed by joining the first half 18a and the second half 18b.

  In the present embodiment, the metal member 27 is embedded in the first base 21 in the implant / joining step. Specifically, when joining the first half 18a and the second half 18b, the metal member 27 is sandwiched between the distal ends of the portions corresponding to the arm portions 25a, and the metal member 27 and the first half are joined together. The joining with the body 18a and the second half 18b is performed simultaneously. At this time, the cylindrical portion 27a of the metal member 27 is arranged at a portion corresponding to the hole 19a of the first base 21, and the extending portion 27b is arranged from the hole 19a to the base side of the arm 25a. The metal member 27 and the first half 18a and the second half 18b can be joined by, for example, an adhesive, but the joining method may be another method.

  Thereby, the metal member 27 is reinforced by the first half 18a and the second half 18b, and the rigidity and strength of the arm 25a are increased. When continuous fibers are arranged from the root side to the tip side of the arm 25a and along the circumferential direction of the hole 19a, the rigidity and strength of the hole 19a are further increased.

  Since the inner surface of the hole 19a is not a surface formed by the molding surface of the mold 40, the first half 18a is joined before joining the first half 18a and the second half 18b. The metal member 27 may be joined after cutting the second half 18b to form an inner surface corresponding to the outer shape of the metal member 27. Thereafter, although not shown, cylindrical members 28 and 29 are arranged in the holes 19b and 19c formed in the main body 18, respectively, and the lower arm 20 is manufactured.

  As described above, in the lower arm 20 according to the present embodiment, the arm portion 25a has the cylindrical portion 27a having the opening 21 'forming the hole portion 19a, and the extending portion 27b connected to the outer periphery of the cylindrical portion 27a. Is disposed. A hole 19a is formed by the cylindrical portion 27a of the metal member 27, and continuous fibers are arranged along the circumferential direction of the cylindrical portion 27a. Therefore, the strength of the hole 19a is increased.

  Further, the metal member 27 has an extending portion 27b provided continuously to the outer peripheral portion of the cylindrical portion 27a, and the metal member 27 including the extending portion 27b is embedded in the fiber reinforced resin. Therefore, the joint area between the metal member 27 and the fiber reinforced resin is increased, so that the rigidity and strength of the arm portion 25a can be increased, and the rigidity of the first base portion 21 against a load from the lateral direction can be increased. In the lower arm 20 according to the present embodiment, continuous fibers are arranged around the holes 19b and 19c where the cylindrical members 28 and 29 are arranged, and the mechanical strength of the second base 22 and the distal end 23 is reduced. Has been enhanced. Therefore, it is possible to obtain the lower arm 20 having excellent durability against a load due to a load or vibration.

  As described above, the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention pertains can conceive various changes or modifications within the scope of the technical idea described in the claims. It is understood that these also belong to the technical scope of the present invention.

  In the above embodiment, the lower arm 20 obtained by the manufacturing method including the bagging step and the molding step using the autoclave apparatus has been described as an example, but the present invention is not limited to such an example. For example, the lower arm 20 of the present invention can be obtained even by a manufacturing method including a step of heating and melting a fiber-reinforced resin laminate using a thermoplastic resin and then press-forming while cooling.

  In the above embodiment, the lower arm 20 has been described as an example of the composite structure. However, the composite structure to which the present invention can be applied is not limited to the lower arm. The present invention can be applied to structural members used for various uses other than structural members of a vehicle body.

Reference Signs List 5 fiber reinforced resin sheet 12 prepreg 14 fiber reinforced resin laminate 18 main body 18a first half 18b second half 19a, 19b, 19c hole 20 composite structure (lower arm)
21 First Base 22 Second Base 23 Tip 25a, 25b, 25c Arm 27 Metal Member 27a Cylindrical Part 27b Extension 28, 29 Cylindrical Member 40 Mold

Claims (4)

A composite structure including an arm portion having a hole portion at a tip portion, which is configured using a fiber reinforced resin including a reinforcing fiber,
The arm portion includes a cylindrical portion having an opening that forms the hole, and an extending portion that is provided continuously from an outer periphery of the cylindrical portion and extends from a root side of the arm portion to a tip side. A composite structure comprising a metal member having a structure embedded in the fiber reinforced resin.   The composite structure according to claim 1, wherein the fiber-reinforced resin covering the cylindrical portion includes continuous fibers arranged along a peripheral surface of the cylindrical portion.   The composite structure according to claim 1, wherein the extending portion has a curved portion or a bent portion.   The composite structure according to claim 1, wherein the composite structure is a suspension arm for a vehicle.

Images