JP2017132063A - Fiber reinforced resin structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel improved fiber reinforced resin structure capable of enhancing strength to flexure deformation.SOLUTION: There is provided a fiber reinforced resin structure containing 2 or more fiber reinforced resin member and having a reinforcement member arranged over the 2 fiber reinforced resin member and extending along a junction of the 2 fiber reinforced resin members, where the reinforcement member strengthens rigidity to a direction of tensile force loaded to the junction of the 2 fiber reinforced resin members when flexure deformation is generated in the fiber reinforced resin structure.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a fiber reinforced resin structure.

  In recent years, fiber reinforced resins such as carbon fiber reinforced resin (CFRP) have been used in various structures in order to improve strength while reducing weight. A fiber reinforced resin structure which is a structure made of such a fiber reinforced resin may include two or more fiber reinforced resin members. And in the field | area regarding the fiber reinforced resin structure containing two or more fiber reinforced resin members, the technique for improving the mechanical characteristic of a fiber reinforced resin structure is proposed.

  For example, in Patent Document 1, the ends of the sandwich structure can be joined together easily and inexpensively without using a fastening member, and the joint can be given sufficiently high strength and rigidity, and the appearance can also be improved. In order to provide an excellent sandwich structure, in the sandwich structure having the core material and the FRP skin plates arranged on both sides thereof and having the ends butt-joined, an FRP connection layer extending over the surfaces of both ends is provided. A technique for providing a layer containing a resin diffusion medium between butted end faces is disclosed.

JP 2000-108232 A

  By the way, structural parts using a fiber reinforced resin such as carbon fiber reinforced resin (CFRP) are being used for structural parts of an automobile body in order to reduce the weight of the vehicle body. For example, for such a structural part of an automobile body, a fiber reinforced resin structure including two or more fiber reinforced resin members and having a joint portion between the fiber reinforced resin members can be applied. Here, a relatively large load that causes bending deformation may be input to the structural parts of the automobile body. When a bending deformation occurs in a structural part having a joint, a tensile force or a compressive force generated by the bending deformation may cause a breakage starting from a joint having generally low strength. Therefore, when a fiber reinforced resin structure having a joint is applied to a structural part of an automobile body, it is considered desirable to improve the strength against bending deformation of the fiber reinforced resin structure.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved fiber reinforced resin structure capable of improving the strength against bending deformation. There is to do.

  In order to solve the above problems, according to an aspect of the present invention, there is provided a fiber reinforced resin structure including two or more fiber reinforced resin members, which is provided across the two fiber reinforced resin members. A reinforcing member extending along the joint between the two fiber reinforced resin members, and the reinforcing member is loaded on the joint between the two fiber reinforced resin members when bending deformation occurs in the fiber reinforced resin structure. A fiber reinforced resin structure is provided that reinforces rigidity in the direction of the pulling force.

  The reinforcing member may be a unidirectional fiber reinforced resin member in which reinforcing fibers are oriented along the direction of the tensile force.

  The reinforcing member may be provided with a protrusion along the direction of the pulling force.

  The protrusion of the reinforcing member may protrude toward the inside of the fiber reinforced resin structure, and may be sandwiched between the two fiber reinforced resin members at the joint.

  Each of the two fiber reinforced resin members is provided with a recess, and the respective recesses of the two fiber reinforced resin members face each other, thereby forming a closed space on the inner side of the fiber reinforced resin structure. May be.

  The reinforcing member may be provided over the outer periphery of the two fiber reinforced resin members.

  The fiber reinforced resin structure may be a vehicle lower arm.

  As described above, according to the present invention, the strength against bending deformation can be improved in the fiber-reinforced resin structure.

It is a mimetic diagram showing an example of composition of a suspension system provided with a lower arm concerning an embodiment of the present invention. It is a disassembled perspective view of a lower arm and a suspension cross member. It is a perspective view which shows an example of the lower arm which concerns on this embodiment. It is explanatory drawing for demonstrating the tension | pulling force and compression force which are loaded on a junction part when bending deformation arises in a lower arm. It is explanatory drawing for demonstrating the tension | pulling force and compression force which are loaded on a junction part when bending deformation arises in a lower arm. It is sectional drawing in the cross section substantially orthogonal to the vehicle width direction for demonstrating an example of a structure of the lower arm which concerns on a comparative example. It is sectional drawing in the cross section substantially orthogonal to the vehicle width direction for demonstrating an example of a structure of the lower arm which concerns on this embodiment. It is sectional drawing in the cross section substantially orthogonal to the vehicle width direction for demonstrating an example of a structure of the lower arm which concerns on a modification.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol. In the present specification and drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral. However, when it is not necessary to particularly distinguish each of a plurality of constituent elements having substantially the same functional configuration, only the same reference numerals are given.

<1. Suspension device>
First, with reference to FIGS. 1-3, the suspension apparatus 1 provided with the lower arm 20 of the vehicle corresponded to the fiber reinforced resin structure which concerns on this embodiment is demonstrated. FIG. 1 is a schematic view showing an example of the configuration of a suspension device 1 for a front wheel of a vehicle provided with a lower arm 20, and FIG. 2 is an exploded perspective view of the lower arm 20 and the suspension cross member 8. FIG. 3 is a perspective view showing an example of the lower arm 20.

  As shown in FIG. 1, in the suspension device 1, the left and right sides of the engine room 2 are partitioned by a front wheel apron 3 that is a component of the vehicle body frame. The front wheel apron 3 is joined to a pair of left and right side frames 5 extending in the front-rear direction of the vehicle body. A strut tower 6 is formed at the rear of the front wheel apron 3. A strut suspension 7 is accommodated in the strut tower 6. The upper portion of the suspension 7 is supported by a strut support portion 6a formed on the upper portion of the strut tower 6 via a strut upper mount 7a.

  A suspension cross member 8 is disposed below the engine room 2. The upper surfaces of both ends in the vehicle width direction of the suspension cross member 8 are fixed to the side frame 5 via fasteners such as bolts and nuts. A rear portion of the engine (not shown) is mounted on the upper surface of the suspension cross member 8 via an engine mount. In addition, arm support portions 9 project from the lower surfaces of both ends of the suspension cross member 8 in the vehicle width direction. As shown in FIG. 2, each of the left and right arm support portions 9 includes a pair of brackets 9a and 9b facing the front, rear, left and right sides with a predetermined interval, and bolt insertion holes 9c are formed in the brackets 9a and 9b. ing. Between the brackets 9a and 9b, a cylindrical first base portion 21 provided at one base end of the lower arm 20 is disposed.

  The lower arm 20 continues from the first base portion 21 serving as one base end to the distal end portion 23, branches from the central portion, extends rearward, and continues to the second base portion 22 serving as the other base end. It has a T-shaped or L-shaped planar shape. A cylindrical member (not shown) is press-fitted into the first base portion 21 of the lower arm 20. The cylindrical member has a shaft portion of a bolt 12 inserted from the outside through a bolt insertion hole 9c formed in the brackets 9a and 9b, and the shaft portion of the bolt 12 is fastened by a nut 13. Yes.

  A cylindrical member (not shown) is press-fitted into the second base portion 22. The second base 22 is pivotally supported on the side frame 5 via the cylindrical member. Further, a cylindrical member (not shown) is press-fitted into the distal end portion 23 serving as the swing end. The tip portion 23 is connected to a ball joint (not shown) via the cylindrical member, and a wheel hub (not shown) that fixes the front wheel 11 is rotatably supported. Thus, the lower arm 20 supports the lower portion of the suspension 7 via a hub housing (not shown) and is supported by the suspension cross member 8 and the side frame 5 so as to be swingable.

  As shown in FIG. 3, the lower arm 20 includes a first base portion 21 connected to the suspension cross member 8, a second base portion 22 connected to the side frame, and a tip portion 23 connected to the ball joint. Have A cylindrical member 27 is press-fitted into the first base portion 21. A cylindrical member 28 is press-fitted into the second base portion 22. A cylindrical member 29 is press-fitted into the distal end portion 23. The cylindrical member 27 press-fitted into the cylindrical first base portion 21 has a central axis substantially coinciding with the longitudinal direction of the vehicle, and enables the tip portion 23 to swing in the vertical direction. Further, the cylindrical member 28 press-fitted into the second base portion 22 has a central axis along a substantially vertical direction, and enables the tip portion 23 to swing in the horizontal direction.

  Further, the lower arm 20 according to the present embodiment is a fiber reinforced resin structure including two or more fiber reinforced resin members, and has a joint portion between the fiber reinforced resin members. Specifically, the lower arm 20 is obtained by joining the upper member 210 and the lower member 220 at the joint 240 as shown in FIG. Each of the upper member 210 and the lower member 220 is provided with a recess, and a closed space is formed on the inner side of the lower arm 20 by facing each of the recesses. When a member having a three-dimensional shape, such as the lower arm 20, is formed using a fiber reinforced resin, it is generally difficult to form the member by press working. Therefore, as will be described later, the upper member 210 and the lower member 220 can be manufactured by, for example, bringing the laminated fiber reinforced resin sheets into close contact with the molding surface of the mold and curing them. In the upper member 210 and the lower member 220 manufactured in this way, the processing accuracy of the surface on the molding surface side is relatively high. Therefore, the lower arm 20 having a three-dimensional shape is manufactured by joining the portions of the upper member 210 and the lower member 220 manufactured in this way to the opposite sides of the molding surfaces.

  As described later, a relatively large load that causes bending deformation may be input to the lower arm 20 described above. When bending deformation occurs in the lower arm 20, a tensile force and a compressive force are applied to the joint 240 of the lower arm 20. The lower arm 20 according to the present embodiment includes a reinforcing member (not shown) that reinforces the rigidity with respect to the direction of the tensile force applied to the joint portion 240. Thereby, according to the present embodiment, even when bending deformation occurs in such a lower arm 20, it is possible to prevent the occurrence of breakage starting from the joint 240. Hereinafter, after describing the bending deformation generated in the lower arm 20, the details of the lower arm 20 capable of improving the strength against the bending deformation will be described.

<2. Lower arm>
(2-1. Bending deformation of lower arm)
First, the bending deformation that occurs in the lower arm 20 will be described with reference to FIGS. 4 and 5 are explanatory diagrams for explaining the tensile force and the compressive force applied to the joint 240 when bending deformation occurs in the lower arm 20. 4 and 5 are schematic views of the lower arm 20 shown in FIG. 3 as viewed from the upper member 210 side.

  FIG. 4 shows a state in which a force directed toward the rear side of the vehicle body is applied to the distal end portion 23. An arrow F10 in FIG. 4 indicates the direction of the force applied to the tip portion 23. As shown in FIG. 4, the force applied to the distal end portion 23 has a component in the direction from the first base portion 21 to the second base portion 22. In the lower arm 20, the first base portion 21 and the second base portion 22 are fixed to the vehicle body. Therefore, as shown in FIG. 4, when a force directed toward the rear side of the vehicle body is applied to the distal end portion 23, bending deformation that causes the distal end portion 23 to bend toward the rear side of the vehicle body occurs in the lower arm 20. Accordingly, a tensile force is applied to the vehicle body front side portion 240 a of the joint portion 240 located between the tip portion 23 and the first base portion 21. On the other hand, a compressive force is applied to a portion 240 b on the vehicle body rear side of the joint portion 240 located between the distal end portion 23 and the second base portion 22.

  FIG. 5 shows a state in which a force directed toward the front side of the vehicle body is applied to the distal end portion 23. An arrow F20 in FIG. 5 indicates the direction of the force applied to the tip portion 23. As shown in FIG. 5, the force applied to the distal end portion 23 has a component in the direction from the second base portion 22 toward the first base portion 21. As shown in FIG. 5, when a force directed toward the front side of the vehicle body is applied to the front end portion 23, bending deformation that causes the front end portion 23 to bend toward the front side of the vehicle body occurs in the lower arm 20. As a result, a compressive force is applied to the front side 240a of the joint 240. On the other hand, a tensile force is applied to the rear portion 240 b of the joint 240.

  In the above, referring to FIG. 4 and FIG. 5, in the bending deformation generated in the lower arm 20, the direction of the tensile force and the compressive force applied to the joint 240 of the upper member 210 and the lower member 220, and the joint 240 However, the direction of the tensile force and the compressive force may be different from the extending direction.

  Here, unlike the lower arm 20 according to the present embodiment, a joint portion of a lower arm according to a comparative example that does not include a reinforcing member will be described. FIG. 6 is a cross-sectional view in a cross section substantially perpendicular to the vehicle width direction for explaining an example of the configuration of the lower arm 90 according to the comparative example. FIG. 6 shows a cross section at the front end portion of the lower arm 90 according to the comparative example, and is a cross section taken along the line AA, which is a cross section substantially orthogonal to the vehicle width direction at the front end portion 23 of the lower arm 20 shown in FIGS. Correspond.

  As shown in FIG. 6, the lower arm 90 according to the comparative example is a fiber reinforced resin structure obtained by joining an upper member 910 and a lower member 920 that are fiber reinforced resin members. The upper member 910 and the lower member 920 are joined by bringing the lower end portion of the upper member 910 and the upper end portion of the lower member 920 into contact with each other at the joint portion 940 and joining them using an adhesive. As an adhesive that can be used to join the upper member 910 and the lower member 920, an epoxy resin-based, acrylic resin-based, urethane resin-based adhesive, or the like can be used as appropriate. Each of the upper member 910 and the lower member 920 is provided with a concave portion 912 and a concave portion 922, and the concave portion 912 and the concave portion 922 are opposed to each other, thereby forming a closed space 930 on the inner side of the lower arm 90. A portion 940 a on the vehicle body front side of the joint portion 940 shown in FIG. 6 is located between the distal end portion of the joint portion 940 and the first base portion. A portion 940b on the vehicle body rear side of the joint portion 940 shown in FIG. 6 is located between the distal end portion of the joint portion 940 and the second base portion.

  As described with reference to FIG. 4, in the state where the force directed toward the rear side of the vehicle body is applied to the front end portion of the lower arm 90, a tensile force is applied to the front portion 940 a of the joint portion 940 shown in FIG. 6. The portion 940b on the vehicle body front-rear side of the joint 940 is loaded with a compressive force. Further, as described with reference to FIG. 5, in the state where the force toward the front side of the vehicle body is applied to the front end portion of the lower arm 90, the portion 940 a on the front side of the vehicle body of the joint portion 940 shown in FIG. A force is applied, and a tensile force is applied to the vehicle body front-rear side portion 940 b of the joint portion 940.

  In the comparative example, the strength against the tensile force and the compressive force applied to the joint portion 940 when bending deformation occurs in the lower arm 90 depends on the joint strength between the upper member 910 and the lower member 920 in the joint portion 940. Here, the joint strength at the joint between the two members decreases as the contact area between the two members decreases. Therefore, in the lower arm 90, when a sufficient contact area between the upper member 910 and the lower member 920 cannot be ensured, the tensile force or the compressive force generated by the bending deformation may cause the fracture from the joint 940 as a starting point.

(2-2. Configuration)
Next, the configuration of the lower arm 20 according to the present embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view in a cross section substantially perpendicular to the vehicle width direction for explaining an example of the configuration of the lower arm 20 according to the present embodiment. Specifically, FIG. 7 is a cross-sectional view taken along the line AA, which is a cross section substantially orthogonal to the vehicle width direction at the distal end portion 23 of the lower arm 20 according to the present embodiment shown in FIGS. 4 and 5.

  As shown in FIG. 7, the lower arm 20 according to this embodiment includes an upper member 210, a lower member 220, and a reinforcing member 250. The lower arm 20 corresponds to a fiber reinforced resin structure according to the present invention including two or more fiber reinforced resin members. The upper member 210 and the lower member 220 correspond to the fiber reinforced resin member according to the present invention.

  Each of the upper member 210 and the lower member 220 may be manufactured by various manufacturing methods. For example, each of the upper member 210 and the lower member 220 is obtained by laminating a fiber reinforced resin sheet obtained by impregnating a reinforced fiber with a matrix resin on a molding surface of a molding die made of, for example, metal or fiber reinforced resin. By covering the reinforced resin laminate with a coating material and reducing the space between the coating material and the mold using a vacuum pump, the fiber reinforced resin laminate is adhered to the molding surface of the mold and cured. Manufactured.

  Each of the upper member 210 and the lower member 220 is formed by laminating a fiber reinforced resin sheet on the molding surface of the molding die, covering the obtained fiber reinforced resin laminate with a covering material, and covering the covering material and the covering material. Air or steam is sent into a space between the fixing member fixed above and the space is pressurized so that the fiber reinforced resin laminate is brought into close contact with the molding surface of the molding die through the coating material and is cured. In some cases, it may be manufactured. In addition, you may pressurize the space between a coating | covering material and the fixing member fixed above the said coating | covering material, heating using an autoclave apparatus.

  Further, each of the upper member 210 and the lower member 220 includes a pressure reduction of a space between the covering material and the mold, and a pressure of a space between the covering material and a fixing member fixed above the covering material. And may be manufactured in parallel.

  The fiber reinforced resin sheet used as a molding material is formed by impregnating a reinforced fiber with a matrix resin. The reinforcing fiber used is not particularly limited, and may be, for example, carbon fiber, glass fiber, aramid fiber, or the like, or may be used in combination of these reinforcing fibers. Among these, carbon fibers have high mechanical properties and are easy to design for strength. Therefore, it is preferable that the reinforcing fibers include carbon fibers.

  The reinforcing fibers may be continuous fibers that are continuous from one end to the other end of the fiber reinforced resin sheet, or may be short fibers that are shorter than the length from one end to the other end of the fiber reinforced resin sheet. Note that continuous fibers and short fibers may be mixed in one fiber-reinforced resin sheet. The fiber reinforced resin sheet laminated in the manufacturing process of the upper member 210 and the lower member 220 may include a fiber reinforced resin sheet in which fibers are oriented in one direction, and the reinforcing fibers are arranged in a plurality of directions. A fiber reinforced resin sheet may be included. By aligning the orientation direction of the reinforcing fibers of each fiber-reinforced resin sheet, the strength of the obtained upper member 210 or lower member 220 in the orientation direction can be effectively improved. Further, the strength of the upper member 210 or the lower member 220 to be obtained is made anisotropic by changing the orientation direction of the reinforcing fibers of at least one of the fiber reinforced resin sheets to be laminated. be able to.

  Moreover, a thermoplastic resin or a thermosetting resin is used for the matrix resin of the fiber reinforced resin sheet. 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, fluorine Examples thereof include resins, polyetherimide resins, polyetherketone resins, polyimide resins and the like.

  As the matrix resin, one or a mixture of two or more of these thermoplastic resins can be used. Alternatively, the matrix resin may be a copolymer of these thermoplastic resins. Further, when the matrix resin is a mixture of these thermoplastic resins, a compatibilizing agent may be used in combination. Furthermore, the matrix resin may contain a brominated flame retardant as a flame retardant, a silicon flame retardant, red phosphorus, or the like.

  In this case, examples of the thermoplastic resin used include polyolefin resins such as polyethylene and polypropylene, polyamide resins such as nylon 6 and nylon 66, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyether ketone, Examples of the resin include polyether sulfone and aromatic polyamide. Among them, the thermoplastic matrix resin is preferably at least one selected from the group consisting of polyamide, polyphenylene sulfide, polypropylene, polyether ether ketone, and phenoxy resin.

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

  The fiber reinforced resin sheet is manufactured by, for example, a method of impregnating the reinforcing fiber with the matrix resin while continuously feeding the reinforcing fiber by a process such as a general film impregnation method or a melt impregnation method. By cutting this fiber reinforced resin sheet into a desired size, a fiber reinforced resin sheet as a molding material is obtained. You may form the fiber reinforced resin sheet of a desired width and length by mutually joining the edge part of the width direction of the several fiber reinforced resin sheet cut | disconnected to the desired size with an adhesive agent. The thickness of a fiber reinforced resin sheet can be made into the value within the range of 0.03-1 mm, for example.

  The upper member 210 and the lower member 220 are joined directly or via other members. For example, the upper member 210 and the lower member 220 are joined by bringing the lower end portion of the upper member 210 and the upper end portion of the lower member 220 into contact with each other at the joining portion 240 and joining them using an adhesive. . As an adhesive that can be used for joining the upper member 210 and the lower member 220, an epoxy resin-based, acrylic resin-based, urethane resin-based adhesive, or the like can be used as appropriate. In addition, in the joining between each member using the adhesive agent demonstrated below, the said adhesive agent illustrated as an adhesive agent which can be used for joining to the upper member 210 and the lower member 220 can be used suitably. Each of the upper member 210 and the lower member 220 is provided with a concave portion 212 and a concave portion 222, and the concave portion 212 and the concave portion 222 face each other, whereby a closed space 230 is formed on the inner side of the lower arm 20.

  As shown in FIG. 7, the reinforcing member 250 is provided across the upper member 210 and the lower member 220, and extends along the joint 240 of the upper member 210 and the lower member 220. The reinforcing member 250 is a member made of fiber reinforced resin, for example, and may be manufactured by the same manufacturing method as the upper member 210 and the lower member 220. Specifically, the reinforcing member 250 is provided from the side surface of the lower end portion of the upper member 210 to the side surface of the upper end portion of the lower member 220, and is joined to the upper member 210 and the lower member 220. For example, the reinforcing member 250 is bonded to the side surface of the lower end portion of the upper member 210 and the side surface of the upper end portion of the lower member 220 using an adhesive.

  In the lower arm 20 according to the present embodiment, a reinforcing member 250 provided over the upper member 210 and the lower member 220 and extending along the joint portion 240 is provided, whereby the upper member 210 and the lower member 220 are joined. It is possible to increase the adhesion area between members that contribute to strength. Therefore, the bonding strength between the upper member 210 and the lower member 220 can be increased.

  The reinforcing member 250 reinforces the rigidity in the direction of the tensile force applied to the joint 240 of the upper member 210 and the lower member 220 when bending deformation occurs in the lower arm 20. Specifically, the reinforcing member 250 according to the present embodiment is a unidirectional fiber reinforced resin member in which reinforcing fibers are oriented along the direction of the tensile force applied to the joint 240. Here, the tensile strength with respect to the orientation direction of the said fiber reinforced resin member can be improved effectively by aligning the orientation direction of the reinforced fiber contained in the fiber reinforced resin member. Therefore, by using the unidirectional fiber reinforced resin member in which the reinforcing fibers are oriented along the direction of the tensile force applied to the joint 240 as the reinforcing member 250, the rigidity in the direction of the tensile force applied to the joint 240 is increased. Can be strengthened.

  Specifically, the rigidity in the direction of the tensile force applied to the vehicle body front side portion 240a of the joint portion 240 is reinforced by the front side reinforcing member 250a that is the reinforcing member 250 positioned on the vehicle body front side. In addition, the rigidity in the direction of the tensile force applied to the portion 240b on the vehicle body rear side of the joint portion 240 is reinforced by the rear side reinforcement member 250b that is the reinforcement member 250 located on the vehicle body rear side.

  As a result, as shown in FIG. 4, when a force directed toward the rear side of the vehicle body is applied to the front end portion 23 of the lower arm 20, the deformation of the lower arm 20 due to the tensile force applied to the vehicle body front side portion 240 a of the joint portion 240. Can be suppressed by the front side reinforcing member 250a. Further, as shown in FIG. 5, when a force directed to the front side of the vehicle body is applied to the tip portion 23 of the lower arm 20, the deformation of the lower arm 20 due to the tensile force applied to the portion 240 b on the vehicle body rear side of the joint portion 240 is performed. It can be suppressed by the rear side reinforcing member 250b. Therefore, the strength against bending deformation of the lower arm 20 can be improved. Therefore, even when bending deformation occurs in the lower arm 20, it is possible to prevent the occurrence of breakage starting from the joint 240. As described above, a tensile force may be generated at a different position in the joint 240 according to the direction of the load input to the lower arm 20. In the present embodiment, as described above, the reinforcing member 250 is provided at a position where a tensile force is generated in the joint 240 in each of the input directions of the load to the lower arm 20. Thereby, according to the direction of the load input into the lower arm 20, the bending deformation of the lower arm 20 can be suppressed appropriately.

  Further, as shown in FIG. 7, the reinforcing member 250 may be provided over the outer peripheral portions of the upper member 210 and the lower member 220. Specifically, a recess 214 and a recess 224 that are recessed toward the inner side of the lower arm 20 are provided at the lower part of the outer periphery of the upper member 210 and the upper part of the outer periphery of the lower member 220, respectively. In a state where the member 220 is joined, the recess 214 and the recess 224 are adjacent to each other. The reinforcing member 250, for example, can be joined to the upper member 210 and the lower member 220 while being installed in a hollow space formed by the hollow portion 214 and the hollow portion 224.

  The shape of the hollow space formed by the hollow portion 214 and the hollow portion 224 may be a shape corresponding to the shape of the reinforcing member 250. For example, when the shape of the reinforcing member 250 is a band shape, the shape of the hollow space may be a groove shape whose dimension in the width direction is slightly larger than that of the reinforcing member 250. Thereby, the positioning of the reinforcing member 250 can be more easily performed in the bonding of the reinforcing member 250 to the upper member 210 and the lower member 220.

  Generally, when bending deformation occurs in an object, the position where the maximum tensile stress is applied to the object is the surface layer portion of the object. Therefore, when the reinforcing member 250 is provided over the outer peripheries of the upper member 210 and the lower member 220, the outer arm is a position where a relatively large tensile force can be generated in the lower arm 20 when bending deformation occurs in the lower arm 20. The strength of can be improved. Therefore, the strength against bending deformation of the lower arm 20 can be improved more effectively.

<3. Modification>
In the above, by using the unidirectional fiber reinforced resin member in which the reinforcing fibers are oriented along the direction of the tensile force applied to the joint 240 as the reinforcing member 250, the rigidity in the direction of the tensile force applied to the joint 240 is determined. The example which strengthens was demonstrated. In the following, referring to FIG. 8, the direction of the tensile force applied to the joint 340 by using the reinforcing member 350 provided with the protrusion 354 along the direction of the tensile force applied to the joint 340. The modification which reinforces the rigidity with respect to is explained.

  FIG. 8 is a cross-sectional view in a cross section substantially perpendicular to the vehicle width direction for explaining an example of the configuration of the lower arm 30 according to the modification. FIG. 8 shows a cross section at the front end portion of the lower arm 30 according to the modification, and is a cross section taken along the line AA, which is a cross section substantially orthogonal to the vehicle width direction at the front end portion 23 of the lower arm 20 shown in FIGS. Correspond.

  As shown in FIG. 8, the lower arm 30 according to the modification includes an upper member 310, a lower member 320, and a reinforcing member 350. The lower arm 30 corresponds to the fiber reinforced resin structure according to the present invention including two or more fiber reinforced resin members. The upper member 310 and the lower member 320 correspond to the fiber reinforced resin member according to the present invention.

  Each of the upper member 310 and the lower member 320 may be manufactured by the same manufacturing method as the upper member 210 and the lower member 220 of the lower arm 20 described with reference to FIG. In the modification, the upper member 310 and the lower member 320 are joined via the reinforcing member 350. Each of the upper member 310 and the lower member 320 is provided with a concave portion 312 and a concave portion 322, and the closed space 330 is formed on the inner side of the lower arm 20 by the concave portion 312 and the concave portion 322 facing each other.

  As shown in FIG. 8, the reinforcing member 350 includes a transition portion 352 and a protrusion 354. In the following description, the transition part and the projection part of the front reinforcement member 350a, which is the reinforcement member 350 located on the front side of the vehicle body, are referred to as the transition part 352a and the projection part 354a, respectively, and are the reinforcement member 350 located on the rear side of the vehicle body. The transition part and the projection part of the rear side reinforcing member 350b are referred to as a transition part 352b and a projection part 354b, respectively.

  The reinforcing member 350 is different from the reinforcing member 250 described with reference to FIG. The reinforcing member 350 is a member made of, for example, fiber reinforced resin. The crossover 352 is provided across the upper member 310 and the lower member 320 and extends along the joint 340 between the upper member 310 and the lower member 320. Specifically, the crossover portion 352 is provided from the side surface of the lower end portion of the upper member 310 to the side surface of the upper end portion of the lower member 320, and is joined to the upper member 310 and the lower member 320. For example, the crossover 352 is bonded to the side surface of the lower end portion of the upper member 310 and the side surface of the upper end portion of the lower member 320 using an adhesive.

  In the lower arm 30 according to the modified example, the lower arm 20 described with reference to FIG. 7 is provided by providing the crossing portion 352 provided over the upper member 310 and the lower member 320 and extending along the joint portion 340. Similarly, the bonding area between the members that contributes to the bonding strength between the upper member 310 and the lower member 320 can be increased. Therefore, the bonding strength between the upper member 310 and the lower member 320 can be increased.

  Further, the crossover part 352 may be provided across the outer periphery of the upper member 310 and the lower member 320. Specifically, the crossover part 352 is installed over the recess part 314 and the recess part 324 respectively provided at the lower part of the outer peripheral part of the upper member 310 and the upper part of the outer peripheral part of the lower member 320. And can be joined to the lower member 320.

  The protruding portion 354 is provided on the crossing portion 352 along the direction of the tensile force applied to the joint portion 340. Thereby, the cross-sectional secondary moment of the lower arm 30 in the cross-section substantially perpendicular to the direction of the tensile force applied to the joint 340 represented by the cross-section shown in FIG. 8 can be increased. Therefore, the rigidity with respect to the direction of the tensile force applied to the joint portion 340 can be enhanced.

  Further, the protruding portion 354 of the reinforcing member 350 may protrude toward the inner side of the lower arm 30. Specifically, the protruding portion 354 protrudes from the center portion of the transition portion 352 toward the closed space 330 side of the lower arm 30. In that case, the protrusion 354 is sandwiched between the upper member 310 and the lower member 320 at the joint 340. The protrusion 354 is joined to the upper member 310 and the lower member 320 in a state where the protrusion 354 is sandwiched between the lower end of the upper member 310 and the upper end of the lower member 320. For example, the upper part of the projection part 354 and the lower end part of the upper member 310 and the lower part of the projection part 354 and the upper end part of the lower member 320 are joined using an adhesive.

  As described above, as shown in FIG. 4, when a force directed toward the rear side of the vehicle body is applied to the front end portion of the lower arm 30, a tensile force is applied to the portion 340 a on the vehicle body front side of the joint portion 340. A compressive force is applied to the rear portion 340b of the portion 340. When a unidirectional fiber reinforced resin member in which reinforcing fibers are oriented along the direction of the tensile force applied to the joint portion 340 is used as the reinforcing member 350, the rigidity in the direction of the tensile force applied to the joint portion 340 is reinforced. Can do. In such a case, the deformation of the lower arm 30 due to the tensile force applied to the front portion 340a of the joint portion 340 can be suppressed by the front reinforcing member 350a.

  Here, it is generally known that the neutral axis in bending deformation of an object may not be located at the center of the object. Therefore, the deformation of the lower arm 30 causes the protrusion 354b protruding toward the closed space 330 provided in the rear reinforcing member 350b in a state where a compressive force is applied to the rear portion 340b of the joint 340 in the vehicle body. A tensile force may be applied to at least a part. In such a case, in the modified example, the protrusion 354b receives a part of the tensile force generated in the lower arm 30, whereby the deformation of the lower arm 30 can be more effectively suppressed.

<4. Summary>
As described above, according to the present embodiment, the reinforcing member 250 is provided across the upper member 210 and the lower member 220 and extends along the joint 240 of the upper member 210 and the lower member 220. Thereby, the adhesion area between the members contributing to the joining strength between the upper member 210 and the lower member 220 can be increased. Therefore, the bonding strength between the upper member 210 and the lower member 220 can be increased. The reinforcing member 250 reinforces the rigidity in the direction of the tensile force applied to the joint 240 of the upper member 210 and the lower member 220 when bending deformation occurs in the lower arm 20. Accordingly, when a relatively large load that causes bending deformation is input to the lower arm 20, deformation of the lower arm 20 can be suppressed. Therefore, the strength against bending deformation of the lower arm 20 can be improved.

  In the above description, the example in which the reinforcing member 250 or the crossover portion 352 is provided over the outer peripheral portion of the upper member and the lower member has been described, but the positional relationship between the reinforcing member 250 or the crossover portion 352 and the upper member and the lower member is related. It is not limited to examples. For example, the reinforcing member 250 or the crossing portion 352 may be provided over the inner peripheral portions of the upper member and the lower member.

  In the above description, the example in which the protruding portion 354 protrudes to the inner side of the lower arm 30 has been described. However, the protruding portion 354 may protrude to the outer side of the lower arm 30. In such a case, for example, the protruding portion 354 protrudes from the transition portion 352 to the opposite side to the closed space 330 of the lower arm 30.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can make various modifications or application examples within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Suspension apparatus 2 Engine room 3 Front wheel apron 5 Side frame 6 Strut tower 6a Strut support part 7 Suspension 7a Strut upper mount 8 Suspension cross member 9 Arm support part 9a, 9b Bracket 9c Bolt insertion hole 11 Front wheel 12 Bolt 13 Nut 20, 30, 90 Lower arm 21 First base portion 22 Second base portion 23 Tip portion 27 Bush 28 Bush 29 Bush 210, 310, 910 Upper member 212, 312, 912 Recess 214, 314 Recessed portion 220, 320, 920 Lower member 222, 322, 922 Recessed part 224, 324 Recessed part 230, 330, 930 Closed space 240, 340, 940 Joint part 250, 350 Reinforcement member 352 Crossover part 354 Projection part

Claims (7)

A fiber reinforced resin structure including two or more fiber reinforced resin members,
A reinforcing member provided over the two fiber-reinforced resin members, and extending along a joint portion of the two fiber-reinforced resin members;
The reinforcing member reinforces the rigidity with respect to the direction of the tensile force applied to the joint of the two fiber reinforced resin members when bending deformation occurs in the fiber reinforced resin structure.
Fiber reinforced resin structure.   The fiber-reinforced resin structure according to claim 1, wherein the reinforcing member is a unidirectional fiber-reinforced resin member in which reinforcing fibers are oriented along the direction of the tensile force.   The fiber-reinforced resin structure according to claim 1 or 2, wherein the reinforcing member is provided with a protrusion along the direction of the pulling force.   The fiber-reinforced resin structure according to claim 3, wherein the protrusion of the reinforcing member protrudes toward the inside of the fiber-reinforced resin structure, and is sandwiched between the two fiber-reinforced resin members at the joint. Each of the two fiber reinforced resin members is provided with a recess,
When the concave portions of the two fiber reinforced resin members are opposed to each other, a closed space is formed on the inner side of the fiber reinforced resin structure.
The fiber reinforced resin structure as described in any one of Claims 1-4.   The fiber reinforced resin structure according to claim 5, wherein the reinforcing member is provided over an outer peripheral portion of the two fiber reinforced resin members.   The fiber reinforced resin structure according to any one of claims 1 to 6, wherein the fiber reinforced resin structure is a lower arm of a vehicle.

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