Body pillar structure and body structure

Abstract

To provide a vehicle body pillar structure and a vehicle body structure which secure bond strength between a cylindrical body of a CFRP-made pillar and an outer layer member and are excellent in rigidity to collision load of lateral collision.SOLUTION: A vehicle body pillar structure comprises: a cylindrical body made of carbon fiber-reinforced resin; and an outer layer member made of carbon fiber-reinforced resin which is arranged at an outer periphery of the cylindrical body. The outer layer member includes a recessed groove part which is arranged at a face in a cylindrical body side and retreated in a direction apart from the cylindrical body to extend in an axial direction of the cylindrical body in which carbon fiber-reinforced resin is arranged in the recessed groove part including a continuous fiber wound around pin members installed at both sides in the axial direction of the recessed groove part and orientated along the axial direction of the cylindrical body.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a vehicle body pillar structure and a vehicle body structure of an automobile using a fiber-reinforced resin composite material. [Background technology]

[0002] In recent years, with the aim of reducing the weight of automobile bodies such as passenger cars, the use of fiber-reinforced resins, typified by carbon fiber reinforced plastics (hereinafter referred to as CFRP), to manufacture structural materials for automobile bodies has been considered. Structural materials made from fiber-reinforced resins have high rigidity, and demonstrate high strength, particularly against compressive or tensile stress acting in the direction of the fiber orientation. Even when constructing structural materials for automobile bodies using fiber-reinforced resins, it is necessary to ensure rigidity against collisions and the strength of connections to other vehicle components.

[0003] For example, Patent Documents 1 and 2 propose vehicle body structures made of carbon fiber reinforced plastic composite material. Specifically, Patent Document 1 discloses a center pillar structure in which the inner wall portion in the vehicle width direction of the B-pillar of a hollow metal frame, which is on the tensile side when a collision load is input in a side collision, is reinforced with a CFRP reinforcing material. Furthermore, Patent Document 2 discloses a vehicle cabin structure in which a center pillar formed integrally with the roof arch and made of CFRP, and a side sill formed integrally with the floor portion and made of CFRP, are connected via a connecting member made of aluminum casting. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-160524 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-193637 Summary of the Invention [Problem to be solved by the invention]

[0005] When applying CFRP to a center pillar, it is desirable to maintain fiber continuity in order to effectively utilize the aforementioned properties of CFRP. Specifically, it is desirable to arrange the reinforcing fibers as continuously as possible in the longitudinal or circumferential direction of the center pillar. Therefore, as in the metal center pillar described in Patent Document 1, if the CFRP outer and inner members each have a hat-shaped cross section and are joined only at the flanges on both ends, it is impossible to maintain fiber continuity, at least in the circumferential direction of the center pillar. Furthermore, joining the outer and inner members only at the flanges on both ends may result in insufficient joint strength.

[0006] In response to this issue, by placing a CFRP cylindrical body between the outer and inner members and then bonding the outer and inner members to the cylindrical body, a closed cross-sectional structure can be achieved that maintains the continuity of the reinforcing fibers while ensuring sufficient bonding strength. In this case, the inner member, which functions to absorb the impact load during a side collision, can be given an uneven cross-sectional shape to improve its section modulus and rigidity. However, if the inner member is made of an uneven cross-sectional shape, the bonding surface with the cylindrical body may be reduced, potentially reducing the bonding strength. Furthermore, if the inner member is made solely of CFRP, the fracture strain is minimal, potentially making it impossible to prevent fracture.

[0007] Therefore, the technology of the present disclosure has been made in consideration of the above problems, and the purpose of the present disclosure is to provide a vehicle pillar structure and a vehicle body structure that ensure the bonding strength between the CFRP pillar tubular body and the outer layer member, and that have excellent rigidity against the collision load of a side collision. [Means for solving the problem]

[0008] In order to solve the above problems, according to one aspect of the technology of the present disclosure, there is provided a vehicle body pillar structure including a cylindrical body made of carbon fiber reinforced resin and an outer layer member made of carbon fiber reinforced resin provided on the outer periphery of the cylindrical body, wherein the outer layer member has a groove portion on the surface facing the cylindrical body that recedes in a direction away from the cylindrical body and extends along the axial direction of the cylindrical body, and within the groove portion is arranged fiber reinforced resin that is wound around pin members provided on both axial sides of the groove portion and includes continuous fibers oriented along the axial direction of the cylindrical body.

[0009] Furthermore, in order to solve the above-mentioned problems, according to another aspect of the technology of the present disclosure, there is provided a vehicle body structure having a vehicle body pillar structure including a cylindrical body made of carbon fiber reinforced resin and an outer layer member made of carbon fiber reinforced resin provided on the outer periphery of the cylindrical body, wherein the outer layer member has a groove portion formed on the surface facing the cylindrical body, the groove portion receding in a direction away from the cylindrical body and extending along the axial direction of the cylindrical body, and within the groove portion is arranged fiber reinforced resin containing continuous fibers wound around pin members provided on both axial sides of the groove portion and oriented along the axial direction of the cylindrical body. [Effects of the Invention]

[0010] As described above, the technology of the present disclosure makes it possible to obtain a vehicle body center pillar structure that ensures the bonding strength between the CFRP pillar tubular body and the outer layer member, and that has excellent rigidity against the collision load of a side collision. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram showing the overall configuration of a vehicle body side structure according to an embodiment of the present invention; [Figure 2] 2A and 2B are a plan view and a cross-sectional view shown to explain the configuration of a center pillar according to the present embodiment. [Figure 3] FIG. 2 is a cross-sectional view illustrating the configuration of a center pillar according to the present embodiment. [Figure 4] FIG. 4 is a view showing the inner surface of an inner member of the center pillar according to the embodiment. [Figure 5]10 is an explanatory diagram showing an example of a configuration in which a pin member provided at the lower part of the center pillar according to the present embodiment is used as part of a connecting structure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Preferred embodiments of the technology of the present disclosure will be described in detail below with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0013] First, an outline of a vehicle body structure including a vehicle body center pillar structure according to this embodiment will be described. Fig. 1 is a schematic diagram showing the appearance of a vehicle body side structure 1. The vehicle body side structure 1 shown in Fig. 1 schematically shows a part of the structure of the left side of a vehicle. As shown in Fig. 1, in this specification, the vehicle width direction may be referred to as the X direction, the vehicle front-rear direction (vehicle length direction) as the Y direction, and the vehicle height direction as the Z direction.

[0014] The vehicle body side structure 1 is composed of a roof pillar 5, a rear pillar 4, a front pillar 2, a center pillar 3, and a side sill 6. The roof pillar 5 extends along the vehicle length in the upper part of the vehicle interior space and forms the side portion of the vehicle roof. The side sill 6 extends along the vehicle length in the lower part of the side of the vehicle.

[0015] The lower end of the front pillar 2 is connected to the front end of the side sill 6, and the upper end is connected to the front end of the roof pillar 5. The front pillar 2 forms the front part of the vehicle's interior space, and is positioned to support the sides of the windshield. The lower end of the rear pillar 4 is connected to the rear end of the side sill 6, and the upper end is connected to the rear end of the roof pillar 5. The lower end of the center pillar 3 is connected to the center of the side sill 6 in the vehicle length direction, and the upper end is connected to the center of the roof pillar 5 in the vehicle length direction.

[0016] An opening for a front door is formed between the side sill 6, the roof pillar 5, the front pillar 2, and the center pillar 3. In addition, an opening for a rear door is formed between the side sill 6, the roof pillar 5, the rear pillar 4, and the center pillar 3. Each member constituting the vehicle body side structure 1 may be composed of a plurality of members. For example, each member may be formed by joining an outer panel on the outside in the vehicle width direction and an inner panel on the inside in the vehicle width direction.

[0017] In this vehicle body side structure 1, the center pillar 3 has a longitudinal direction along the vehicle height direction and is formed in a generally cylindrical shape. The center pillar 3 has a roof pillar connection portion 16 provided at its upper end, a side sill connection portion 14 provided at its lower end, and a pillar main body portion 12 located between the roof pillar connection portion 16 and the side sill connection portion 14. In this embodiment, the center pillar 3 is molded using carbon fiber reinforced resin.

[0018] Next, the configuration of the center pillar 3 of this embodiment will be described in detail. 2 to 4 are diagrams shown to explain the configuration of the center pillar 3 of this embodiment. The center pillar 3 shown in FIGS. 2 to 4 is a simplified version of the center pillar 3 of the vehicle body side structure 1 shown in FIG. 1. The center of FIG. 2 shows a view of the center pillar 3 seen from the outside of the vehicle body, the left side of FIG. 2 shows a view of the center pillar 3 seen from the inside of the vehicle body, and the right side of FIG. 2 shows a cross-sectional view taken along line II. FIG. 3 is a cross-sectional view taken along line II-II of the center pillar 3 shown in FIG. 2. FIG. 4 is a view showing the inner surface of the inner member 21 of the center pillar 3.

[0019] The center pillar 3 includes an inner member 21 located inside the vehicle body, an outer member 31 located outside the vehicle body, and a cylindrical body 41 located between the inner member 21 and the outer member 31. The inner member 21, the outer member 31, and the cylindrical body 41 are each made of CFRP. Of these, the inner member 21 and the outer member 31 correspond to outer layer members provided on the outer periphery of the cylindrical body 41.

[0020] The inner member 21 and the outer member 31 each have a portion at their upper ends that constitutes the roof pillar connection portion 16, and a portion at their lower ends that constitutes the side sill connection portion 14. The inner member 21 also has flange portions 21a, 21b on both sides in the vehicle length direction of the middle portion that constitutes the pillar main body portion 12. The outer member 31 also has flange portions 31a, 31b on both sides in the vehicle length direction of the middle portion that constitutes the pillar main body portion 12. The tubular body 41 is molded in a hollow cylindrical shape and has a three-dimensional shape that corresponds to the shape of the pillar main body portion 12.

[0021] The roof pillar connection portion 16 and the side sill connection portion 14 are respectively formed by the upper and lower ends of the inner member 21 and the outer member 31, and are groove-shaped and extend in the vehicle length direction to fit into the roof pillar 5 and the side sill 6. However, the shapes of the roof pillar connection portion 16 and the side sill connection portion 14 are not limited to groove shapes.

[0022] The pillar main body 12 has a generally cylindrical shape with an axial direction extending along the vehicle height direction. The pillar main body 12 is configured as a molded body with a cylindrical closed cross section, in which a cylindrical body 41 is sandwiched between an inner member 21 and an outer member 31, the inner surfaces of the inner member 21 and the outer member 31 are joined to the outer surface of the cylindrical body 41, and the flange portions 21a, 21b of the inner member 21 are joined to the flange portions 31a, 31b of the outer member 31 (see FIG. 3). The joining of the inner member 21 and the outer member 31 to the cylindrical body 41, and the joining of the flange portions 21a, 21b of the inner member 21 to the flange portions 31a, 31b of the outer member 31 are performed using, for example, an adhesive. The joined flange portions 21a, 21b, 31a, 31b can be used, for example, as door stops for front and rear doors.

[0023] The cylindrical body 41 is formed using a fiber-reinforced resin obtained by impregnating carbon fibers with a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polyvinyl chloride resin, ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), polystyrene resin, AS resin (acrylonitrile-styrene copolymer synthetic resin), polyamide resin, polyacetal resin, polycarbonate resin, polyester resin, PPS (polyphenylene sulfide) resin, fluororesin, polyetherimide resin, polyetherketone resin, and polyimide resin.

[0024] The matrix resin may be one of these thermoplastic resins or a mixture of two or more of them. Alternatively, the matrix resin may be a copolymer of these thermoplastic resins. When the thermoplastic resin is a mixture, a compatibilizer may be used in combination. Furthermore, a flame retardant such as a bromine-based flame retardant, a silicon-based flame retardant, or red phosphorus may be added to the thermoplastic resin.

[0025] Examples of thermosetting resins include epoxy resins, unsaturated polyester resins, vinyl ester resins, phenolic resins, polyurethane resins, and silicone resins. One or a mixture of two or more of these thermosetting resins can be used as the matrix resin. When using these thermosetting resins, an appropriate curing agent or reaction accelerator may be added to the thermosetting resin.

[0026] The carbon fibers may contain an appropriate ratio of fibers oriented in the axial direction and fibers oriented in a direction transverse to the axial direction. The amount of fibers oriented in the axial direction adjusts the tensile stress generated when a collision load is input in a side collision. The amount of fibers oriented in a direction transverse to the axial direction adjusts the rigidity against the collision load in a side collision and adjusts the amount of collision energy absorption. Because the cylindrical body 41 is a molded body with a cylindrical closed cross section, fiber continuity can be maintained not only in the axial direction (vehicle length direction), but also in the circumferential direction around the axis, thereby increasing rigidity against the collision load in a side collision.

[0027] The cylindrical body 41 may be a hollow tubular member or a solid member filled with resin or other appropriate material. The cylindrical body 41 may also contain short fibers in addition to continuous fibers, and may also contain fibers other than carbon fibers as reinforcing fibers.

[0028] Like the cylindrical body 41, the outer member 31 is formed using a fiber-reinforced resin in which carbon fibers are impregnated with a thermoplastic resin or a thermosetting resin. The carbon fibers may contain an appropriate ratio of fibers oriented in the axial direction and fibers oriented in a direction intersecting the axial direction. However, the orientation direction of the carbon fibers may be aligned in one direction or may be different. Furthermore, the outer member 31 may also contain short fibers in addition to continuous fibers, and may contain fibers other than carbon fibers as reinforcing fibers.

[0029] 3, the outer member 31 of the center pillar 3 of this embodiment is formed to have a hat-shaped cross section, and a cylindrical body 41 is disposed in a recessed region between flange portions 31a, 31b at both ends in the vehicle longitudinal direction. At least the bottom surface of the recessed region of the outer member 31 is joined to the outer surface of the cylindrical body 41.

[0030] The inner member 21 includes a base material 23 and filling portions 29a, 29b, and 29c (hereinafter collectively referred to as filling portions 29 unless otherwise specified). The base material 23 is formed using a fiber-reinforced resin in which carbon fibers are impregnated with a thermoplastic resin or a thermosetting resin. The carbon fibers may contain an appropriate ratio of fibers oriented in the axial direction and fibers oriented in a direction intersecting the axial direction. However, the orientation direction of the carbon fibers may be aligned in one direction or may be different. Furthermore, the inner member 21 may also contain short fibers in addition to continuous fibers, and may contain fibers other than carbon fibers as reinforcing fibers.

[0031] As shown in Fig. 3, the base material 23 of the inner member 21 has, on its surface facing the cylindrical body 41, a plurality of grooves 27a, 27b, and 27c (hereinafter collectively referred to as grooves 27 unless otherwise required) that recede in a direction away from the cylindrical body 41 and extend along the axial direction of the cylindrical body 41. In the example shown in Fig. 3, the base material 23 has three grooves 27a, 27b, and 27c. Providing a plurality of grooves 27 in the base material 23 increases the section modulus of the base material 23, thereby increasing the rigidity against a bending moment that acts when a collision load is input in a side collision.

[0032] The filling portions 29 are disposed in the respective recessed groove portions 27. Each filling portion 29 is wound around pin members 25u, 25d provided on both axial sides of the recessed groove portion 27 and is made of fiber-reinforced resin containing continuous fibers oriented along the axial direction (see FIG. 4). The pin members 25u, 25d are rod-shaped members made of metal such as iron or aluminum, and are fixed to the base material 23. The pin members 25u, 25d are not limited to metal members as long as they are made of a material that will not deform during heat treatment in the molding process of the inner member 21.

[0033] Such filling portion 29 can be formed by, for example, using a tailored fiber placement (TFP) method. In this case, it is preferable that the position (height) of the surface of the fiber-reinforced resin filled in groove portion 27 is the same as the position (height) of the edge of groove portion 27, and that the surface of inner member 21 facing cylindrical body 41 is flush with no steps. This makes the bonding surface of inner member 21 to cylindrical body 41 uniform and increases the bonding area, making it possible to suppress a decrease in bonding strength.

[0034] The breaking strain of the filling portion 29 is designed to be larger than the breaking strain of the CFRP that constitutes the inner member 21. For example, by using fibers having a larger strain coefficient than carbon fibers as the continuous fibers that constitute the filling portion 29, the breaking strain of the filling portion 29 can be larger than the breaking strain of CFRP. Examples of such fibers include glass fibers or aramid fibers, or a mixture of both, but other fibers may also be used. Furthermore, by using a resin having a larger strain coefficient than CFRP as the resin that constitutes the filling portion 29, the breaking strain of the filling portion 29 can be larger than the breaking strain of CFRP. Examples of such resins include mixtures containing polyphenylene ether (PPE) resin, but other resins may also be used.

[0035] Because the fracture strain of the filling portion 29 is larger than that of CFRP, the risk of fracture of the inner member 21, which has the function of receiving the load, is reduced when the collision load of a side collision is input, and this is effective in absorbing collision energy and ensuring safety inside the vehicle cabin.

[0036] In this embodiment, the pin members 25u, 25d of the inner member 21 may be used as part of a connecting structure that connects the center pillar (vehicle body pillar structure) 3 to a vehicle body structural member. Specifically, the pin member 25u provided on the upper part of the center pillar 3 may be used as part of a connecting structure that connects the center pillar 3 to the roof pillar 5, and the pin member 25d provided on the lower part of the center pillar 3 may be used as part of a connecting structure that connects the center pillar 3 to the side sill 6.

[0037] 5 shows a configuration example in which a pin member 25d provided at the lower part of the center pillar 3 is used as part of a connecting structure that connects the center pillar 3 to the side sill 6. FIG. 5 shows how the lower part of the center pillar 3 corresponding to the cross-sectional view shown on the right side of FIG. 2 is connected to the side sill 6.

[0038] The pin member 25d penetrates the base material 23 of the inner member 21 and is provided so that one axial end side is exposed to the outside of the inner member 21. The pin member 25d has bolt holes 26 formed along the axis and opening at both axial ends of the pin member 25d. A connecting bolt 28 serving as a connecting member for connecting the center pillar 3 and the side sill 6 is inserted into the bolt hole 26. A bolt hole 7 is also formed in the side sill 6, and the connecting bolt 28 is also inserted into the bolt hole 7. Therefore, the center pillar 3 and the side sill 6 are connected by inserting the connecting bolt 28 into the bolt hole 26 of the pin member 25d and the bolt hole 7 of the side sill 6 and tightening it.

[0039] Although not shown in the figures, the pin member 25u provided on the upper part of the center pillar 3 has a similar configuration and is used as part of the connecting structure that connects the center pillar 3 to the roof pillar 5. In this way, by using the pin members 25u, 25d as part of the connecting structure that connects the center pillar 3 to the roof pillar 5 or the side sill 6, it is not necessary to provide a separate structure for positioning the center pillar 3 with respect to the roof pillar 5 or the side sill 6, or a separate connecting member for connecting the center pillar 3 to the roof pillar 5 or the side sill 6.

[0040] Next, an example of a method for manufacturing the center pillar 3 according to this embodiment and a method for forming the inner member 21 using the TFP method will be described. First, the outer member 31 and the cylindrical body 41 are formed by a conventional method such as braiding, filament winding, sheet winding, lay-up, cold press molding, or hot press molding. The method for forming the outer member 31 and the cylindrical body 41 is not particularly limited.

[0041] Furthermore, CFRP prepregs are laminated using a molding die or the like to form a semi-molten intermediate base material having a plurality of grooves 27 corresponding to the base material 23. At this time, pin members 25u, 25d are provided on both axial sides of each groove 27. In the case of the inner member 21 shown in FIG. 4, the pin members 25u, 25d are provided so that their axial direction is aligned with the thickness direction of the intermediate base material. The pin members 25u, 25d may be installed in advance when the intermediate base material is formed, or they may be arranged after the intermediate base material is formed. The method for forming the intermediate base material is not particularly limited.

[0042] Next, continuous fiber is wound around the two pin members 25u, 25d for each of the recessed grooves 27, and fiber bundles are arranged in each of the recessed grooves 27. Furthermore, the fiber bundles are sewn to the intermediate base material. The process of arranging the fiber bundles and sewing them to the intermediate base material is performed by applying the TFP method.

[0043] Next, resin is poured into each of the grooves 27 in which the fiber bundles are arranged, to form a fiber-reinforced resin consisting of the fiber bundles and resin in the grooves 27. Thereafter, the fiber-reinforced resin in the grooves 27 is cured together with the intermediate substrate, thereby forming the inner member 21 in which the filling portions 29 are formed in the grooves 27.

[0044] Next, the inner member 21 and the outer member 31 are joined to the cylindrical body 41 using an adhesive or the like, thereby obtaining the center pillar 3 according to this embodiment.

[0045] According to the center pillar 3 of this embodiment, the inner member 21 has a plurality of grooves 27 extending along the axial direction, which increases the section modulus of the base material 23 and increases rigidity against bending moments acting when a collision load is input in a side collision. Furthermore, the grooves 27 of the inner member 21 are provided with filled portions 29 made of fiber-reinforced resin containing continuous fibers arranged along the axial direction, and whose fracture strain is greater than that of CFRP. This reduces the risk of fracture of the inner member 21, which functions to withstand a load when a collision load is input in a side collision, and is effective in absorbing collision energy and ensuring safety within the vehicle interior.

[0046] Furthermore, with the center pillar 3 according to this embodiment, the position (height) of the filling portion 29 filled in the recessed groove portion 27 of the inner member 21 is the same as the position (height) of the edge of the recessed groove portion 27, and the surface of the inner member 21 facing the cylindrical body 41 is flush with no steps. This makes the bonding surface of the inner member 21 with respect to the cylindrical body 41 uniform and increases the bonding area, making it possible to prevent a decrease in bonding strength.

[0047] Furthermore, the center pillar 3 according to this embodiment is made up of the inner member 21, outer member 31, and cylindrical body 41, and is configured such that the inner member 21 and the outer member 31 are joined around the cylindrical body 41, resulting in a cylindrical closed cross-section structure that can maintain the continuity of the reinforcing fibers in all directions, including the axial and circumferential directions. This allows the center pillar 3 to effectively utilize the strength characteristics of fiber-reinforced resin.

[0048] Furthermore, in the center pillar 3 according to this embodiment, the pin members 25u, 25d used when forming the filling portion 29 disposed in the recessed groove portion 27 of the inner member 21 can be used as part of a connecting structure for connecting the center pillar 3 to the roof pillar 5 and the side sill 6. This eliminates the need for a separate structure for positioning the center pillar 3 relative to the roof pillar 5 and the side sill 6, and a separate connecting member for connecting the center pillar 3 to the roof pillar 5 or the side sill 6.

[0049] Although preferred embodiments of the technology of the present disclosure have been described in detail above with reference to the accompanying drawings, the technology of the present disclosure is not limited to these examples. It is clear that a person skilled in the art of the technology to which the present disclosure pertains can conceive of various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure. Furthermore, combinations of the above-described embodiments and each modified example also naturally fall within the technical scope of the present disclosure. [Explanation of symbols]

[0050] 1: vehicle body side structure, 3: center pillar, 5: roof pillar, 6: side sill, 7: bolt hole, 12: pillar main body, 14: side sill connection portion, 16: roof pillar connection portion, 21: inner member, 21a: flange portion, 21b: flange portion, 23: base material, 25d: pin member, 25u: pin member, 26: bolt hole, 27, 27a, 27b, 27c: groove portion, 28: connecting bolt, 29, 29a, 29b, 29c: filling portion, 31: outer member, 31a: flange portion, 31b: flange portion, 41: cylindrical body

Claims

1. a cylindrical body made of carbon fiber reinforced resin; an outer layer member made of carbon fiber reinforced resin provided on the outer periphery of the cylindrical body; In a vehicle body pillar structure including the outer layer member has a recessed groove portion on a surface facing the cylindrical body, the recessed groove portion receding in a direction away from the cylindrical body and extending along the axial direction of the cylindrical body, A vehicle body pillar structure in which a fiber-reinforced resin containing continuous fibers wound around pin members provided on both axial sides of the groove portion and oriented along the axial direction of the cylindrical body is arranged within the groove portion.

2. The vehicle body pillar structure according to claim 1 , wherein the pin member is used as a part of a connecting structure that connects the vehicle body pillar structure to a vehicle body structural member.

3. The vehicle body pillar structure according to claim 2 , wherein the pin member has a bolt hole or a connecting member for connecting the vehicle body pillar structure to the vehicle body structural member.

4. 2. The vehicle body pillar structure according to claim 1, wherein the continuous fibers of the fiber-reinforced resin filled in the recessed groove portion include fibers different from the carbon fibers.

5. a cylindrical body made of carbon fiber reinforced resin; an outer layer member made of carbon fiber reinforced resin provided on the outer periphery of the cylindrical body; In a vehicle body structure having a vehicle body pillar structure including: the outer layer member has a recessed groove formed on a surface facing the cylindrical body, the recessed groove extending along the axial direction of the cylindrical body and receding in a direction away from the cylindrical body; A vehicle body structure in which a fiber-reinforced resin containing continuous fibers wound around pin members provided on both axial sides of the groove portion and oriented along the axial direction of the cylindrical body is arranged within the groove portion.

Images