WO2014156682A1 - Fiber-reinforced resinous vehicular floor structure and manufacturing method of same - Google Patents

Fiber-reinforced resinous vehicular floor structure and manufacturing method of same Download PDF

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Publication number
WO2014156682A1
WO2014156682A1 PCT/JP2014/056667 JP2014056667W WO2014156682A1 WO 2014156682 A1 WO2014156682 A1 WO 2014156682A1 JP 2014056667 W JP2014056667 W JP 2014056667W WO 2014156682 A1 WO2014156682 A1 WO 2014156682A1
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WIPO (PCT)
Prior art keywords
forming material
reinforced resin
floor structure
section
fiber reinforced
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PCT/JP2014/056667
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French (fr)
Japanese (ja)
Inventor
黒田義人
関戸俊英
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東レ株式会社
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Priority to JP2014512579A priority Critical patent/JPWO2014156682A1/en
Publication of WO2014156682A1 publication Critical patent/WO2014156682A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
    • B62D29/043—Superstructures

Definitions

  • the present invention relates to a fiber reinforced resin vehicle floor structure in which a floor forming material forming a floor portion and side forming materials extending in the vehicle front-rear direction on both sides of the floor portion are integrated, and a method for manufacturing the same.
  • the vehicle floor structure is usually made of metal.
  • the vehicle floor structure 103 is integrated.
  • the side portion 102 has a closed cross-sectional structure in order to ensure high bending rigidity and torsional rigidity of the entire vehicle floor structure 103.
  • a hat-shaped cross-sectional member must be joined to each other in the side portion 102 to form a hollow structure. There is a problem that it takes time and effort. Further, when the hat-shaped cross-section members are joined together, it is generally joined partially by spot welding, so that it is difficult to increase the rigidity of the entire structure 103.
  • the vehicle floor structure 111 made of fiber reinforced resin having a cross section as shown in FIG. 11 is drawn and formed including the side portion 112 having a closed cross section.
  • 11 is a structure that is relatively long in the direction perpendicular to the paper surface of FIG. 11 (that is, the longitudinal direction of the vehicle). Therefore, it is usually difficult to draw out such a long member with a substantially equal cross section. is there.
  • Patent Documents 1 and 2 disclose a technique for producing a side portion having a closed cross section as a member made of fiber reinforced resin.
  • Patent Document 1 extends the side portion made of fiber reinforced resin in the horizontal direction.
  • a fiber reinforced resin vehicle floor structure which is joined and integrated with a fiber reinforced resin floor formed by an RTM (Resin Transfer Molding) method at one joint surface.
  • the side portion made of fiber reinforced resin having a closed cross-sectional shape has only one joining surface extending in a planar shape. Since it is joined to the floor part made of steel, when viewed from the whole floor structure, there is a risk that the joint strength between the side part and the floor part may not be secured sufficiently high, in other words, the force transmission characteristics at this joint part, in other words, There remains concern about the mechanical properties of this part (especially bending rigidity and torsional rigidity).
  • the object of the present invention is to make sure that the fiber-reinforced resin side portion having a closed cross-sectional shape is bonded more securely and more firmly to the fiber-reinforced resin floor portion in order to eliminate the above-mentioned concerns in the prior art.
  • Another object of the present invention is to provide a fiber reinforced resin vehicle floor structure capable of reducing the weight of the vehicle and capable of producing a mechanical structure such as high bending rigidity and torsional rigidity as a whole structure and a method for manufacturing the same.
  • a method for manufacturing a fiber reinforced resin vehicle floor structure includes a floor forming material for forming a floor portion extending in a vehicle width direction and a vehicle front-rear direction, and the floor portion.
  • the side forming material is manufactured as a molded body or a preformed body in which at least a part of the side portion is preliminarily molded, and the side forming material is disposed at a predetermined position in a mold, and the floor forming material Is disposed in a mold so as to be in contact with at least two different surfaces from the side forming material, and a resin is injected and impregnated into the reinforcing fiber base, and the resin is added to the reinforcing fiber base. Impregnated Consists wherein the integrating by bonding serial floor forming member and the said side forming material.
  • the side forming material is a preformed molded body (that is, a fiber reinforced resin molded body) or a preformed body (that is, a prepreg, A preformed body for a fiber-reinforced resin molded body such as a pre-shaped reinforcing fiber base material), and is placed in a predetermined position in the mold (that is, a position for forming a predetermined side portion).
  • a reinforcing fiber base for constituting the floor forming material is disposed in the mold so that the side forming material is in contact with at least two surfaces different from the side forming material, and resin is injected into the reinforcing fiber base.
  • Impregnated and RTM molding of the floor forming material is performed.
  • the floor forming material in which the reinforcing fiber base material is impregnated with the resin and the side forming material are integrated by injection resin injection.
  • the floor forming material and the side forming material to be integrated are bonded at least on two different surfaces, so that the floor forming material and the side forming material are bonded securely and firmly.
  • mechanical properties such as high bending rigidity and torsional rigidity are exhibited as a whole structure.
  • the target fiber-reinforced resin vehicle can be obtained by a simple molding process equivalent to the case of only the RTM molding of the floor forming material.
  • the floor structure for use is easily and reliably manufactured.
  • an adhesive layer can be interposed between the reinforcing fiber base constituting the floor forming material.
  • an adhesive used for the adhesive layer for example, a film adhesive can be used.
  • the side cross-sectional shape of the closed cross section can be set to an appropriate shape, but the floor forming material and the side forming material In view of facilitating the joining, for example, it is preferable to form in a square closed cross-sectional shape.
  • the side forming material can be prepared as a molded body or a preformed body formed in a form having a cross section of a closed cross section equivalent to the side part to be finally manufactured, or the side forming material Is formed as a molded body or a preformed body having an open portion in the cross section, and the cross section of the target closed cross section in the side section is formed by integrating the side forming material and the floor forming material. You can also.
  • the side part of the finally manufactured fiber reinforced resin vehicle floor structure may have a closed cross-sectional shape.
  • the previously molded molded body or the preformed body can be disposed so as to be surrounded by the reinforcing fiber base material constituting the floor forming material.
  • the floor forming material and the side forming material can be more reliably and firmly joined and integrated.
  • the closed cross section of the side part may be left as a hollow part, or a core material may be arranged in the hollow part.
  • the molded body or the preform can be easily molded into a predetermined cross-sectional structure.
  • the cross-sectional shape of the side forming material previously arranged in the mold can be easily maintained in a predetermined shape.
  • the at least two different surfaces may include, for example, two surfaces extending at different angles with respect to the horizontal plane, for example, two surfaces extending adjacent to each other at different angles.
  • the other surface is preferably within a range of 10 to 120 ° with respect to the horizontal surface.
  • a range of 30 to 95 degrees is more preferable, a range of 70 to 90 degrees is more preferable, and a range of 75 to 85 degrees is particularly preferable.
  • a particularly preferable range is within the range of 75 to 85 degrees, and by setting the angle of the other surface to 75 degrees or more, it becomes possible to secure a wide cabin space as much as possible. It becomes possible to ensure the ease of die cutting at the time of forming the forming material or at the time of forming the side portion.
  • the floor forming material and the side forming material are joined and integrated on two surfaces spread at the same angle with respect to the horizontal plane at different positions. Even in such a form, the floor forming material and the side forming material are firmly joined and integrated, and the floor for the target is made of a fiber reinforced resin vehicle by a simple molding process only of RTM molding of the floor forming material. The structure is easily and reliably manufactured.
  • the at least two different surfaces in consideration of the fact that a load is applied to the vehicle floor structure in the vertical direction and the vehicle width direction of the vehicle, the configuration includes two surfaces that spread at different angles with respect to the horizontal plane. This is more advantageous and preferable from the viewpoint of maintaining the bonding strength.
  • the side forming material is not limited to linearly extending in the vehicle front-rear direction, and may be configured to extend non-linearly in the vehicle front-rear direction. That is, in many vehicles, the outer surface often extends so as to draw a curved line in the vehicle front-rear direction, so that it is possible to cope with such a form.
  • the reinforcing fiber of the fiber reinforced resin constituting the vehicle floor structure is not particularly limited, and carbon fiber, glass fiber, aramid fiber, or a combination thereof can be used. From the viewpoint of manufacturing a vehicle floor structure, carbon fiber is preferably used as the reinforcing fiber in consideration of the ease of strength design.
  • the matrix resin of the fiber reinforced resin is not particularly limited, and either a thermoplastic resin or a thermosetting resin can be used.
  • the present invention has a floor forming material for forming a floor portion extending in the vehicle width direction and the vehicle front-rear direction, and extends in the vehicle front-rear direction at both sides in the vehicle width direction of the floor portion, and the cross section is formed as a closed cross section.
  • a pre-formed side forming material for forming at least a part of the side part is integrated by joining by molding of the floor forming material on at least two different surfaces of the side forming material.
  • a floor structure for a vehicle made of fiber reinforced resin is also provided.
  • an embodiment in which an adhesive layer is interposed between the preformed side forming material and the floor forming material is adopted.
  • an adhesive layer is interposed between the preformed side forming material and the floor forming material.
  • a film adhesive can be used as the adhesive.
  • the fiber reinforced resin vehicle floor structure according to the present invention it is possible to adopt a form in which the cross section of the side portion is formed in a square closed cross section.
  • the hollow part of the cross section of the closed cross section in the side part can be left in a hollow form, or a form in which the core material is arranged in the hollow part can be adopted.
  • any of the above-described at least two different planes including two planes extending at different angles with respect to the horizontal plane, at least two different planes including two planes extending at the same angle with respect to the horizontal plane, and any combination thereof Can also be adopted.
  • any of a form in which the side portion extends linearly in the vehicle front-rear direction, a form that extends non-linearly, or a combination thereof can be employed.
  • the reinforcing fiber of the fiber reinforced resin constituting the vehicle floor structure is not particularly limited, and carbon fiber, glass fiber, aramid fiber, or a combination thereof can be used. From the viewpoint of manufacturing a high-strength, high-rigidity vehicle floor structure, it is preferable that carbon fiber is used as the reinforcing fiber, considering the ease of strength design.
  • the matrix resin of the fiber reinforced resin is not particularly limited, and either a thermoplastic resin or a thermosetting resin can be used.
  • the fiber reinforced resin side portion having the closed cross-sectional shape can be reliably and strongly bonded to the fiber reinforced resin floor portion.
  • the vehicle floor structure can be joined and integrated, the vehicle floor structure as a whole can exhibit mechanical properties such as high bending rigidity and torsional rigidity.
  • a fiber reinforced resin vehicle floor structure targeted for high mechanical characteristics can be manufactured by using RTM molding of a floor forming material, and the manufacturing can be facilitated.
  • FIG. 1 is a schematic cross-sectional view showing a fiber reinforced resin vehicle floor structure according to an embodiment of the present invention and a method for manufacturing the same. It is a general
  • FIG. 1 shows a fiber reinforced resin vehicle floor structure according to an embodiment of the present invention and a method for manufacturing the same.
  • FIG. 1 shows a transverse section (that is, a section in the vehicle width direction) seen in a direction crossing the vehicle longitudinal direction.
  • 1 shows the whole of a fiber reinforced resin vehicle floor structure.
  • a floor forming material 3 made of fiber reinforced resin for forming a floor portion 2 extending in the vehicle width direction (left-right direction in FIG. 1) and the vehicle front-rear direction (direction perpendicular to the paper surface in FIG.
  • side forming material 5 made of fiber reinforced resin is integrated to form side portion 4 extending in the vehicle front-rear direction at both sides in the vehicle width direction of floor portion 2 and having a cross section formed in a closed cross section.
  • a resin vehicle floor structure 1 is shown.
  • the side forming material 5 is produced as a molded body or a preformed body having a closed cross section.
  • the side forming material 5 is configured to have a structure in which the core material 6 is disposed in a hollow portion having a closed cross section.
  • the core material 6 is made of a lightweight material such as foam.
  • the side box forming material 5 constituting part of the substantially box-shaped cross section that wraps around the core material 6 is made of fiber reinforced resin, and in this embodiment, a flange portion that extends toward the center of the floor 2 in the lower part thereof. 7 is extended.
  • Pre-formed side forming materials 5 on both sides are arranged at predetermined positions in a cavity of a forming die (not shown), and the reinforcing fiber base material constituting the floor forming material 3 is the flange portion 7 of the side forming material 5.
  • One side surface 8 forming the slope of each side forming material 5, and three different surfaces of the top surface 9 of each side forming material 5 are disposed in the mold.
  • Resin matrix resin
  • the resin injected into the reinforcing fiber base disposed in the mold is impregnated, and the resin is cured, whereby the floor forming material 3 is RTM-molded.
  • the floor forming material 3 in which the reinforcing fiber base is impregnated with the resin and the side forming material 5 are joined and integrated to form a vehicle floor made of fiber reinforced resin.
  • the structure 1 is produced.
  • the floor forming material 3 and the side forming material 5 are joined and integrated at least on two different surfaces (three surfaces in this embodiment).
  • the fiber-reinforced resin vehicle floor structure 1 as a whole is surely and firmly joined and integrated, and mechanical characteristics such as high bending rigidity and torsional rigidity are exhibited.
  • the above-mentioned joining and integration are performed by using the RTM molding of the floor forming material 3, it is made of a target fiber reinforced resin in a simple molding process equivalent to the case of only the RTM molding of the floor forming material.
  • the vehicle floor structure 1 is easily and reliably manufactured.
  • an angle ⁇ (shown in FIG. 1) between at least two different surfaces for joining and integrating the floor forming material 3 and the side forming material 5, for example, a horizontal plane forming portion of the floor forming material 3 is used.
  • the angle ⁇ formed by the other surface is preferably in the range of 10 to 120 degrees with respect to the horizontal plane, and more preferably in the range of 30 to 95 degrees. Of these, a range of 70 to 90 degrees is more preferable, and a range of 75 to 85 degrees is particularly preferable.
  • the side forming material 11 is provided with a flange portion 12 similar to the above, and an extended side surface portion 13 in which a slope portion forming the side surface of the side forming material 11 extends upward as it is.
  • the floor forming material 14 is joined and integrated with two different surfaces of the flange portion 12 and the side surface portion of the side forming material 11 including the extended side surface portion 13.
  • an adhesive layer 16 may be interposed between the reinforcing fiber bases constituting the floor forming material 3.
  • the adhesive used for the adhesive layer 16 for example, a film adhesive can be used.
  • the above-mentioned preformed body or preform can be disposed so as to be surrounded by the reinforcing fiber base material constituting the floor forming material 17.
  • the floor forming material 17 and the side forming material 5 can be more reliably and firmly joined and integrated.
  • the side forming material may be prepared in advance so that the side portion of the finally produced fiber reinforced resin vehicle floor structure has a cross-sectional shape of a closed cross section.
  • the material itself can be prepared as a molded body or a preformed body having an open portion in the cross section. Examples of the case where the side forming material prepared in advance is manufactured as a molded body or a preformed body having an open portion in the cross section are illustrated in FIGS.
  • the side forming material 21 is prepared in advance as a molded body or a preformed body having the opening 22, and the floor forming material 23 is joined to the side forming material 21 using RTM molding. It is integrated and the closed cross-section structure of a side part is finally completed.
  • RTM molding of the floor forming material 23 in order to keep the reinforcing fiber base impregnated with the resin in a predetermined form in the mold, particularly in the open portion 22 portion (that is, the closed section structure).
  • a balloon-shaped core that can be expanded and contracted is arranged, and RTM molding is performed in a state where the inside of the core is pressurized. it can.
  • a relatively thick resin film is disposed so as to close the open portion 22, and the RTM is applied to the resin film from the floor forming material 23 side during the RTM molding of the floor forming material 23. It is also possible to support a reinforcing fiber substrate for molding.
  • the side forming material 31 is manufactured in advance as a molded body or a preformed body having the open portion 32, and the side forming material 31 has a flange extending in the horizontal direction as shown in FIG. 3. Part 33 and an extended side surface part 34 extending obliquely upward, and a floor forming material 35 is joined to and integrated with this side forming material 31 using RTM molding, and finally the side portion A closed cross-sectional structure is completed.
  • the side forming material 41 is produced in advance as a substantially L-shaped molded body or preform having an open portion 42, and a flange portion 43 extending in the horizontal direction is provided below the side forming material 41.
  • a flange portion 44 extending in the horizontal direction is also provided at the upper portion, and a floor forming material 45 is joined and integrated to the side forming material 41 using RTM molding, and finally the side portion A closed cross-sectional structure is completed.
  • the side forming material 51 can be formed in a shape extending longer toward the center of the floor forming material 52.
  • the joint between the side forming material 51 and the floor forming material 52 can be made longer, and the joint strength of both members, and hence the mechanical properties of the entire structure can be improved. become.
  • the fiber reinforced resin vehicle floor structure and its manufacturing method according to the present invention can be applied to any vehicle aimed at weight reduction and the like.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
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Abstract

Provided are: a method for manufacturing a fiber-reinforced resinous vehicular floor structure in which a floor-forming material and a side-forming material of which the transverse cross-section is formed into a closed cross-section are integrated, the side-forming material being created as a pre-molded compact or a preliminary compact, the side-forming material being disposed in a predetermined position inside a mold, a reinforcing fibrous substrate constituting the floor-forming material being disposed inside the mold so as to be in contact with the side-forming material in at least two different surfaces, and a resin being poured into and impregnated in the reinforcing fibrous substrate to integrate, by bonding, the side-forming material and the floor-forming material impregnated with the resin; and a fiber-reinforced resinous vehicular floor structure manufactured by this method. A side portion having a closed cross-section is integrally bonded reliably and firmly with a floor portion, and high mechanical properties can be achieved in the entire fiber-reinforced resinous vehicular floor structure.

Description

繊維強化樹脂製車両用フロア構造体およびその製造方法Fiber reinforced resin vehicle floor structure and method of manufacturing the same
　本発明は、フロア部を形成するフロア形成材とフロア部の両側で車両前後方向に延びるサイド形成材とを一体化した繊維強化樹脂製車両用フロア構造体およびその製造方法に関する。 The present invention relates to a fiber reinforced resin vehicle floor structure in which a floor forming material forming a floor portion and side forming materials extending in the vehicle front-rear direction on both sides of the floor portion are integrated, and a method for manufacturing the same.
　車両のフロア構造体は、通常、金属で構成されている。例えば図１０に車両幅方向に横断した方向の断面を示すように、金属の溶接などで、フロア部１０１とそのフロア部の両側で車両前後方向に延びるサイド部１０２（サイドシル部と呼ばれることもある。）とを一体化した車両用フロア構造体１０３が例示される。サイド部１０２は、車両用フロア構造体１０３全体の曲げ剛性や捩り剛性を高く確保するために、閉断面構造に構成されている。しかし、このような断面構造を有する車両用フロア構造体１０３を金属で構成する場合、とくにサイド部１０２において、ハット形断面形状の部材を互いに接合して中空構造を形成しなければならず、製造に手間がかかるという問題がある。また、ハット形断面部材同士を接合する場合、一般にスポット溶接で部分的に接合されるため、構造体１０３全体の剛性を高めにくい。 The vehicle floor structure is usually made of metal. For example, as shown in a cross section in a direction transverse to the vehicle width direction in FIG. 10, there is a case where the floor portion 101 and side portions 102 extending in the vehicle front-rear direction on both sides of the floor portion are called by metal welding. The vehicle floor structure 103 is integrated. The side portion 102 has a closed cross-sectional structure in order to ensure high bending rigidity and torsional rigidity of the entire vehicle floor structure 103. However, when the vehicle floor structure 103 having such a cross-sectional structure is made of metal, a hat-shaped cross-sectional member must be joined to each other in the side portion 102 to form a hollow structure. There is a problem that it takes time and effort. Further, when the hat-shaped cross-section members are joined together, it is generally joined partially by spot welding, so that it is difficult to increase the rigidity of the entire structure 103.
　この場合、図１０に示すように、ハット形断面部材同士が接合されたサイド部１０２では、接合面積が小さいと接合部等の強度が低くなり、構造体１０３全体の強度、剛性を確保することが難しくなる場合がある。また、図１１に示すような横断面を有する繊維強化樹脂製の車両用フロア構造体１１１を、閉断面のサイド部１１２を含めて引き抜き成形することが考えられるが、この車両用フロア構造体１１１は図１１の紙面と垂直の方向（つまり、車両の前後方向）に比較的長尺の構造体となるので、通常、略等断面でそのような長尺の部材を引き抜き成形することは困難である。 In this case, as shown in FIG. 10, in the side portion 102 where the hat-shaped cross-section members are joined together, if the joining area is small, the strength of the joining portion or the like is lowered, and the strength and rigidity of the entire structure 103 are ensured. May be difficult. Further, it is conceivable that the vehicle floor structure 111 made of fiber reinforced resin having a cross section as shown in FIG. 11 is drawn and formed including the side portion 112 having a closed cross section. 11 is a structure that is relatively long in the direction perpendicular to the paper surface of FIG. 11 (that is, the longitudinal direction of the vehicle). Therefore, it is usually difficult to draw out such a long member with a substantially equal cross section. is there.
　特許文献１、２には、閉断面のサイド部を繊維強化樹脂製の部材として作製する技術が開示されており、とくに特許文献１には、その繊維強化樹脂製サイド部を、水平方向に延びる一つの接合面にて、ＲＴＭ(Resin Transfer Molding)法で成形される繊維強化樹脂製フロア部と接合、一体化した繊維強化樹脂製車両用フロア構造体が記載されている。 Patent Documents 1 and 2 disclose a technique for producing a side portion having a closed cross section as a member made of fiber reinforced resin. In particular, Patent Document 1 extends the side portion made of fiber reinforced resin in the horizontal direction. There is described a fiber reinforced resin vehicle floor structure which is joined and integrated with a fiber reinforced resin floor formed by an RTM (Resin Transfer Molding) method at one joint surface.
　しかし、上記特許文献１に記載されているような繊維強化樹脂製車両用フロア構造体においては、閉断面形状の繊維強化樹脂製サイド部が、平面状に延びる一つの接合面のみで繊維強化樹脂製フロア部と接合されているので、フロア構造体全体でみた場合、サイド部とフロア部の接合強度が十分に高く確保されないおそれがあり、この接合部分での力の伝達特性、換言すれば、この部分の機械特性（とくに、曲げ剛性や捩り剛性）に不安が残る。 However, in the floor structure for a vehicle made of fiber reinforced resin as described in Patent Document 1, the side portion made of fiber reinforced resin having a closed cross-sectional shape has only one joining surface extending in a planar shape. Since it is joined to the floor part made of steel, when viewed from the whole floor structure, there is a risk that the joint strength between the side part and the floor part may not be secured sufficiently high, in other words, the force transmission characteristics at this joint part, in other words, There remains concern about the mechanical properties of this part (especially bending rigidity and torsional rigidity).
特開２０１０－１５５４０３号公報JP 2010-155403 A 特開２００８－０６８５８７号公報JP 2008-068587 A
　そこで本発明の課題は、上記のような従来技術における懸念点を払拭するために、閉断面形状を有する繊維強化樹脂製サイド部が、より確実にかつより強固に繊維強化樹脂製フロア部と接合され、構造体全体として高い曲げ剛性や捩り剛性等の機械特性を発現できるようにした、車両の軽量化が可能な繊維強化樹脂製車両用フロア構造体とその製造方法を提供することにある。 Therefore, the object of the present invention is to make sure that the fiber-reinforced resin side portion having a closed cross-sectional shape is bonded more securely and more firmly to the fiber-reinforced resin floor portion in order to eliminate the above-mentioned concerns in the prior art. Another object of the present invention is to provide a fiber reinforced resin vehicle floor structure capable of reducing the weight of the vehicle and capable of producing a mechanical structure such as high bending rigidity and torsional rigidity as a whole structure and a method for manufacturing the same.
　また、そのような繊維強化樹脂製車両用フロア構造体を、繊維強化樹脂製フロア部のＲＴＭ成形を介して容易にかつ確実に実現できる技術を提供することも本発明の課題とする。 It is also an object of the present invention to provide a technology that can easily and reliably realize such a fiber reinforced resin vehicle floor structure through RTM molding of the fiber reinforced resin floor portion.
　上記課題を解決するために、本発明に係る繊維強化樹脂製車両用フロア構造体の製造方法は、車両幅方向と車両前後方向に延びるフロア部を形成するためのフロア形成材と、該フロア部の車両幅方向両側部位で車両前後方向に延び、横断面が閉断面に形成されたサイド部を形成するためのサイド形成材とが一体化された繊維強化樹脂製車両用フロア構造体を製造する方法であって、前記サイド形成材を、前記サイド部の少なくとも一部を予め成形した成形体または予備成形体として作製し、該サイド形成材を型内の所定位置に配置し、前記フロア形成材を構成する強化繊維基材を、前記サイド形成材と少なくとも互いに異なる２面で接するように型内に配置し、該強化繊維基材に樹脂を注入、含浸し、前記強化繊維基材に樹脂が含浸された前記フロア形成材と前記サイド形成材とを接合により一体化することを特徴とする方法からなる。 In order to solve the above-mentioned problems, a method for manufacturing a fiber reinforced resin vehicle floor structure according to the present invention includes a floor forming material for forming a floor portion extending in a vehicle width direction and a vehicle front-rear direction, and the floor portion. Manufacturing a fiber reinforced resin vehicle floor structure integrated with a side forming material extending in the vehicle longitudinal direction at both sides in the vehicle width direction and forming a side portion having a cross section formed in a closed cross section. The side forming material is manufactured as a molded body or a preformed body in which at least a part of the side portion is preliminarily molded, and the side forming material is disposed at a predetermined position in a mold, and the floor forming material Is disposed in a mold so as to be in contact with at least two different surfaces from the side forming material, and a resin is injected and impregnated into the reinforcing fiber base, and the resin is added to the reinforcing fiber base. Impregnated Consists wherein the integrating by bonding serial floor forming member and the said side forming material.
　このような本発明に係る繊維強化樹脂製車両用フロア構造体の製造方法においては、サイド形成材は、予め成形した成形体（つまり、繊維強化樹脂成形体）または予備成形体（つまり、プリプレグや予備賦形された強化繊維基材等の繊維強化樹脂成形体用の予備成形体）として予め作製され、型内の所定位置（つまり、所定のサイド部を形成するための位置）に配置される。このサイド形成材に対し、該サイド形成材と少なくとも互いに異なる２面で接するように、フロア形成材を構成するための強化繊維基材が型内に配置され、その強化繊維基材に樹脂が注入、含浸され、フロア形成材のＲＴＭ成形が行われる。このＲＴＭ成形により、強化繊維基材に樹脂が含浸されたフロア形成材と上記サイド形成材とが注入樹脂による接合により一体化される。一体化されるフロア形成材とサイド形成材は、少なくとも互いに異なる２面で接合されることになるので、確実にかつ強固に接合されることになり、この少なくとも互いに異なる２面での接合を介して、構造体全体として高い曲げ剛性や捩り剛性等の機械特性が発現される。また、フロア形成材のＲＴＭ成形を利用して上記接合、一体化が行われるので、単なるフロア形成材のＲＴＭ成形のみの場合と同等の簡単な成形工程にて、目標とする繊維強化樹脂製車両用フロア構造体が容易にかつ確実に製造される。 In such a method for manufacturing a fiber reinforced resin vehicle floor structure according to the present invention, the side forming material is a preformed molded body (that is, a fiber reinforced resin molded body) or a preformed body (that is, a prepreg, A preformed body for a fiber-reinforced resin molded body such as a pre-shaped reinforcing fiber base material), and is placed in a predetermined position in the mold (that is, a position for forming a predetermined side portion). . A reinforcing fiber base for constituting the floor forming material is disposed in the mold so that the side forming material is in contact with at least two surfaces different from the side forming material, and resin is injected into the reinforcing fiber base. Impregnated and RTM molding of the floor forming material is performed. By this RTM molding, the floor forming material in which the reinforcing fiber base material is impregnated with the resin and the side forming material are integrated by injection resin injection. The floor forming material and the side forming material to be integrated are bonded at least on two different surfaces, so that the floor forming material and the side forming material are bonded securely and firmly. As a result, mechanical properties such as high bending rigidity and torsional rigidity are exhibited as a whole structure. In addition, since the above-mentioned joining and integration are performed using the RTM molding of the floor forming material, the target fiber-reinforced resin vehicle can be obtained by a simple molding process equivalent to the case of only the RTM molding of the floor forming material. The floor structure for use is easily and reliably manufactured.
　上記本発明に係る繊維強化樹脂製車両用フロア構造体の製造方法において、上記フロア形成材と上記サイド形成材とを接合により一体化するに際して、上記予め成形した成形体または予備成形体と、上記フロア形成材を構成する強化繊維基材との間に、接着剤の層を介在させることができる。接着剤の層の介在により、より確実で強固な接合、一体化が可能になる。接着剤層に用いる接着剤としては、例えば、フィルム接着剤を用いることができる。 In the method for manufacturing a fiber reinforced resin vehicle floor structure according to the present invention, when the floor forming material and the side forming material are integrated by bonding, the preformed molded body or preformed body, An adhesive layer can be interposed between the reinforcing fiber base constituting the floor forming material. By interposing the adhesive layer, more reliable and strong bonding and integration are possible. As an adhesive used for the adhesive layer, for example, a film adhesive can be used.
　また、本発明に係る繊維強化樹脂製車両用フロア構造体の製造方法においては、閉断面のサイド部横断面形状は、適当な形状に設定可能であるが、フロア形成材とサイド形成材との接合の容易化を考慮すると、例えば角形閉断面形状に形成することが好ましい。 Further, in the method for manufacturing a fiber reinforced resin vehicle floor structure according to the present invention, the side cross-sectional shape of the closed cross section can be set to an appropriate shape, but the floor forming material and the side forming material In view of facilitating the joining, for example, it is preferable to form in a square closed cross-sectional shape.
　また、上記サイド形成材は、最終的に作製されるサイド部と同等の閉断面の横断面を有する形態に形成された成形体または予備成形体として作製しておくこともできるし、サイド形成材を、横断面に開放部を有する成形体または予備成形体として作製し、該サイド形成材とフロア形成材との一体化により、サイド部における目標とする閉断面の横断面を形成するようにすることもできる。いずれの方法においても、最終的に製造される繊維強化樹脂製車両用フロア構造体のサイド部が閉断面の横断面形状を有するようにすればよい。 In addition, the side forming material can be prepared as a molded body or a preformed body formed in a form having a cross section of a closed cross section equivalent to the side part to be finally manufactured, or the side forming material Is formed as a molded body or a preformed body having an open portion in the cross section, and the cross section of the target closed cross section in the side section is formed by integrating the side forming material and the floor forming material. You can also. In any of the methods, the side part of the finally manufactured fiber reinforced resin vehicle floor structure may have a closed cross-sectional shape.
　また、本発明においては、上記予め成形した成形体または予備成形体を、上記フロア形成材を構成する強化繊維基材で囲い包むように配置することもできる。このようにすれば、フロア形成材とサイド形成材とのより確実で強固な接合、一体化が可能になる。 Further, in the present invention, the previously molded molded body or the preformed body can be disposed so as to be surrounded by the reinforcing fiber base material constituting the floor forming material. In this way, the floor forming material and the side forming material can be more reliably and firmly joined and integrated.
　また、上記サイド部における閉断面の横断面部は、中空部のままとされてもよく、中空部内にコア材が配置された形態としてもよい。コア材が配置された形態では、成形体または予備成形体の所定横断面構造への成形を容易に行うことができる。また、フロア形成材のＲＴＭ成形の際に、先に型内に配置されているサイド形成材の断面形状を所定の形状に保ちやすくなる。 Further, the closed cross section of the side part may be left as a hollow part, or a core material may be arranged in the hollow part. In the form in which the core material is disposed, the molded body or the preform can be easily molded into a predetermined cross-sectional structure. In addition, during the RTM molding of the floor forming material, the cross-sectional shape of the side forming material previously arranged in the mold can be easily maintained in a predetermined shape.
　また、上記少なくとも互いに異なる２面としては、例えば、水平面に対し互いに異なる角度で広がる２面、例えば互いに隣接して異なる角度で広がる２面を含む形態とすることができる。この場合、隣接して互いに異なる角度で広がる２面のなす角度としては、例えば一方の面を水平面に対し０度の面とすると、他方の面は、水平面に対し好ましくは１０～１２０度の範囲内、より好ましくは３０～９５度の範囲内、さらに好ましくは７０～９０度の範囲内、とくに好ましくは７５～８５度の範囲内とすることができる。とくに好ましい範囲として７５～８５度の範囲内とし、他方の面の角度を７５度以上とすることで、極力広い車室空間を確保することが可能になり、８５度以下とすることで、サイド形成材成形時あるいはサイド部成形時の型抜きの容易性を確保することが可能になる。 In addition, the at least two different surfaces may include, for example, two surfaces extending at different angles with respect to the horizontal plane, for example, two surfaces extending adjacent to each other at different angles. In this case, as an angle formed by two adjacent surfaces spreading at different angles, for example, if one surface is a surface of 0 ° with respect to the horizontal surface, the other surface is preferably within a range of 10 to 120 ° with respect to the horizontal surface. Of these, a range of 30 to 95 degrees is more preferable, a range of 70 to 90 degrees is more preferable, and a range of 75 to 85 degrees is particularly preferable. A particularly preferable range is within the range of 75 to 85 degrees, and by setting the angle of the other surface to 75 degrees or more, it becomes possible to secure a wide cabin space as much as possible. It becomes possible to ensure the ease of die cutting at the time of forming the forming material or at the time of forming the side portion.
　また、上記少なくとも互いに異なる２面として、水平面に対し同じ角度で広がる２面を含む形態を採用することもできる。すなわち、異なる位置で水平面に対し同じ角度で広がる２面でフロア形成材とサイド形成材が接合、一体化される形態である。このような形態においても、フロア形成材とサイド形成材が強固に接合、一体化され、かつ、フロア形成材のＲＴＭ成形のみの簡単な成形工程にて、目標とする繊維強化樹脂製車両用フロア構造体が容易にかつ確実に製造される。上記少なくとも互いに異なる２面に関しては、車両用フロア構造体に対して車両の上下方向、車幅方向に荷重がかかることを考慮すると、前述の水平面に対して互いに異なる角度で広がる２面を含む形態の方が、接合強度維持の面からは有利であり、好ましい。 Further, it is possible to adopt a form including two surfaces spreading at the same angle with respect to the horizontal plane as the at least two different surfaces. That is, the floor forming material and the side forming material are joined and integrated on two surfaces spread at the same angle with respect to the horizontal plane at different positions. Even in such a form, the floor forming material and the side forming material are firmly joined and integrated, and the floor for the target is made of a fiber reinforced resin vehicle by a simple molding process only of RTM molding of the floor forming material. The structure is easily and reliably manufactured. Regarding the at least two different surfaces, in consideration of the fact that a load is applied to the vehicle floor structure in the vertical direction and the vehicle width direction of the vehicle, the configuration includes two surfaces that spread at different angles with respect to the horizontal plane. This is more advantageous and preferable from the viewpoint of maintaining the bonding strength.
　また、上記サイド形成材は、車両前後方向に直線状に延びるものとは限らず、車両前後方向に非直線状に延びている形態を採用することもできる。すなわち、多くの車両においては、外側面が車両前後方向に曲線ラインを描くように延びる場合が多く、このような形態に対応できるようにしたものである。 Further, the side forming material is not limited to linearly extending in the vehicle front-rear direction, and may be configured to extend non-linearly in the vehicle front-rear direction. That is, in many vehicles, the outer surface often extends so as to draw a curved line in the vehicle front-rear direction, so that it is possible to cope with such a form.
　また、車両用フロア構造体を構成する繊維強化樹脂の強化繊維としては、とくに限定されず、炭素繊維やガラス繊維、アラミド繊維など、あるいはこれらの組み合わせを使用できるが、軽量で高強度、高剛性の車両用フロア構造体の製造を目指す点から、さらには強度設計の容易性を考慮すると、強化繊維に炭素繊維が使用されていることが好ましい。繊維強化樹脂のマトリックス樹脂としても、とくに限定されず、熱可塑性樹脂、熱硬化性樹脂のいずれも使用できる。 In addition, the reinforcing fiber of the fiber reinforced resin constituting the vehicle floor structure is not particularly limited, and carbon fiber, glass fiber, aramid fiber, or a combination thereof can be used. From the viewpoint of manufacturing a vehicle floor structure, carbon fiber is preferably used as the reinforcing fiber in consideration of the ease of strength design. The matrix resin of the fiber reinforced resin is not particularly limited, and either a thermoplastic resin or a thermosetting resin can be used.
　本発明は、車両幅方向と車両前後方向に延びるフロア部を形成するためのフロア形成材と、該フロア部の車両幅方向両側部位で車両前後方向に延び、横断面が閉断面に形成されたサイド部の少なくとも一部を形成するための予め成形されたサイド形成材とが、該サイド形成材の少なくとも互いに異なる２面で、前記フロア形成材の成形による接合により一体化されていることを特徴とする繊維強化樹脂製車両用フロア構造体についても提供する。 The present invention has a floor forming material for forming a floor portion extending in the vehicle width direction and the vehicle front-rear direction, and extends in the vehicle front-rear direction at both sides in the vehicle width direction of the floor portion, and the cross section is formed as a closed cross section. A pre-formed side forming material for forming at least a part of the side part is integrated by joining by molding of the floor forming material on at least two different surfaces of the side forming material. Also provided is a floor structure for a vehicle made of fiber reinforced resin.
　上記本発明に係る繊維強化樹脂製車両用フロア構造体においては、上記予め成形されたサイド形成材と、上記フロア形成材との間に、接着剤の層が介在されている形態を採用することができる。接着剤としては、例えばフィルム接着剤を使用できる。 In the fiber reinforced resin vehicle floor structure according to the present invention, an embodiment in which an adhesive layer is interposed between the preformed side forming material and the floor forming material is adopted. Can do. For example, a film adhesive can be used as the adhesive.
　また、本発明に係る繊維強化樹脂製車両用フロア構造体においては、上記サイド部の横断面が角形閉断面に形成されている形態を採用することができる。 In addition, in the fiber reinforced resin vehicle floor structure according to the present invention, it is possible to adopt a form in which the cross section of the side portion is formed in a square closed cross section.
　また、上記サイド形成材の横断面が閉断面に形成されている形態を採用することができる。 Further, it is possible to adopt a form in which the cross section of the side forming material is formed in a closed cross section.
　また、上記サイド形成材の横断面が開放部を有している形態を採用することができる。 Further, it is possible to adopt a form in which the cross section of the side forming material has an open portion.
　また、上記サイド形成材が、上記フロア形成材で囲い包まれている形態を採用することができる。 Further, it is possible to adopt a form in which the side forming material is surrounded by the floor forming material.
　また、上記サイド部における閉断面の横断面の中空部は、中空形態のままとすることもできるし、中空部内にコア材が配置されている形態を採用することもできる。 Moreover, the hollow part of the cross section of the closed cross section in the side part can be left in a hollow form, or a form in which the core material is arranged in the hollow part can be adopted.
　また、上記少なくとも互いに異なる２面として、水平面に対し互いに異なる角度で広がる２面を含む形態、少なくとも互いに異なる２面として、水平面に対し同じ角度で広がる２面を含む形態、これらの組み合わせ形態のいずれも採用可能である。 In addition, any of the above-described at least two different planes including two planes extending at different angles with respect to the horizontal plane, at least two different planes including two planes extending at the same angle with respect to the horizontal plane, and any combination thereof Can also be adopted.
　また、上記サイド部が車両前後方向に直線状に延びている形態、非直線状に延びている形態、これらの組み合わせ形態のいずれも採用可能である。 Further, any of a form in which the side portion extends linearly in the vehicle front-rear direction, a form that extends non-linearly, or a combination thereof can be employed.
　また、車両用フロア構造体を構成する繊維強化樹脂の強化繊維としては、とくに限定されず、炭素繊維やガラス繊維、アラミド繊維など、あるいはこれらの組み合わせを使用できるが、前述したように、軽量で高強度、高剛性の車両用フロア構造体の製造を目指す点から、さらには強度設計の容易性を考慮すると、強化繊維に炭素繊維が使用されていることが好ましい。繊維強化樹脂のマトリックス樹脂としても、とくに限定されず、熱可塑性樹脂、熱硬化性樹脂のいずれも使用できる。 Further, the reinforcing fiber of the fiber reinforced resin constituting the vehicle floor structure is not particularly limited, and carbon fiber, glass fiber, aramid fiber, or a combination thereof can be used. From the viewpoint of manufacturing a high-strength, high-rigidity vehicle floor structure, it is preferable that carbon fiber is used as the reinforcing fiber, considering the ease of strength design. The matrix resin of the fiber reinforced resin is not particularly limited, and either a thermoplastic resin or a thermosetting resin can be used.
　このように、本発明に係る繊維強化樹脂製車両用フロア構造体およびその製造方法によれば、閉断面形状を有する繊維強化樹脂製サイド部を、確実にかつ強固に繊維強化樹脂製フロア部と接合、一体化でき、軽量な車両用フロア構造体でありながら、車両用フロア構造体全体として高い曲げ剛性や捩り剛性等の機械特性を発現することができる。また、高い機械特性の目標とする繊維強化樹脂製車両用フロア構造体を、フロア形成材のＲＴＭ成形を利用して製造でき、製造の容易化をはかることもできる。 As described above, according to the fiber reinforced resin vehicle floor structure and the manufacturing method thereof according to the present invention, the fiber reinforced resin side portion having the closed cross-sectional shape can be reliably and strongly bonded to the fiber reinforced resin floor portion. Although the vehicle floor structure can be joined and integrated, the vehicle floor structure as a whole can exhibit mechanical properties such as high bending rigidity and torsional rigidity. Further, a fiber reinforced resin vehicle floor structure targeted for high mechanical characteristics can be manufactured by using RTM molding of a floor forming material, and the manufacturing can be facilitated.
本発明の一実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略横断面図である。1 is a schematic cross-sectional view showing a fiber reinforced resin vehicle floor structure according to an embodiment of the present invention and a method for manufacturing the same. 図１の構造体と同等の構造体の概略部分横断面図である。It is a general | schematic partial cross-sectional view of the structure equivalent to the structure of FIG. 本発明の別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 本発明のさらに別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 本発明のさらに別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 本発明のさらに別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 本発明のさらに別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 本発明のさらに別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 本発明のさらに別の実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示す概略部分横断面図である。It is a general | schematic fragmentary cross-sectional view which shows the floor structure for vehicles made from fiber reinforced resin which concerns on another embodiment of this invention, and its manufacturing method. 従来の金属製車両用フロア構造体およびその製造方法を示す概略横断面図である。It is a general | schematic cross-sectional view which shows the conventional metal vehicle floor structure and its manufacturing method. 繊維強化樹脂製車両用フロア構造体を引き抜き成形することを想定した場合を説明するための概略横断面図である。It is a schematic cross-sectional view for explaining a case where it is assumed that a fiber reinforced resin vehicle floor structure is formed by pultrusion.
　以下に、本発明の実施の形態について、図面を参照しながら説明する。
　図１は、本発明の一実施態様に係る繊維強化樹脂製車両用フロア構造体およびその製造方法を示している。図１は、車両前後方向を横断する方向でみた横断面（つまり、車両幅方向における断面）を示しており、図１において、１は、繊維強化樹脂製車両用フロア構造体の全体を示している。本実施態様では、車両幅方向（図１の左右方向）と車両前後方向（図１の紙面と垂直の方向）に延びるフロア部２を形成するための繊維強化樹脂製のフロア形成材３と、フロア部２の車両幅方向両側部位で車両前後方向に延び、横断面が閉断面に形成されたサイド部４を形成するための繊維強化樹脂製のサイド形成材５とが一体化された繊維強化樹脂製車両用フロア構造体１が示されている。サイド形成材５は、一体化される前に、横断面が閉断面の成形体または予備成形体として作製され、本実施態様では、閉断面の中空部内にコア材６が配置された構造に構成されている。コア材６は、発泡体等の軽量な材料からなる。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a fiber reinforced resin vehicle floor structure according to an embodiment of the present invention and a method for manufacturing the same. FIG. 1 shows a transverse section (that is, a section in the vehicle width direction) seen in a direction crossing the vehicle longitudinal direction. In FIG. 1, 1 shows the whole of a fiber reinforced resin vehicle floor structure. Yes. In this embodiment, a floor forming material 3 made of fiber reinforced resin for forming a floor portion 2 extending in the vehicle width direction (left-right direction in FIG. 1) and the vehicle front-rear direction (direction perpendicular to the paper surface in FIG. 1); Fiber reinforcement in which side forming material 5 made of fiber reinforced resin is integrated to form side portion 4 extending in the vehicle front-rear direction at both sides in the vehicle width direction of floor portion 2 and having a cross section formed in a closed cross section. A resin vehicle floor structure 1 is shown. Before the side forming material 5 is integrated, the side forming material 5 is produced as a molded body or a preformed body having a closed cross section. In this embodiment, the side forming material 5 is configured to have a structure in which the core material 6 is disposed in a hollow portion having a closed cross section. Has been. The core material 6 is made of a lightweight material such as foam.
　コア材６を包み込んでいる略箱形横断面のサイド形成材５構成部は、繊維強化樹脂製であり、本実施態様では、その下部に、フロア部２の中央部方向に向けて延びるフランジ部７が延設されている。両側の予め成形されたサイド形成材５が成形型（図示略）のキャビティ内の所定位置に配置され、上記フロア形成材３を構成する強化繊維基材が、サイド形成材５の上記フランジ部７の上面、各サイド形成材５の斜面を形成している一側面８と、各サイド形成材５の上面９の互いに異なる３面で接するように型内に配置される。型内に樹脂（マトリックス樹脂）が注入され、型内に配置されている強化繊維基材に注入された樹脂が含浸され、樹脂が硬化されることにより、フロア形成材３がＲＴＭ成形される。このフロア形成材３のＲＴＭ成形を介して、強化繊維基材に樹脂が含浸されたこのフロア形成材３と上記サイド形成材５とが接合され、一体化されて、繊維強化樹脂製車両用フロア構造体１が作製される。 The side box forming material 5 constituting part of the substantially box-shaped cross section that wraps around the core material 6 is made of fiber reinforced resin, and in this embodiment, a flange portion that extends toward the center of the floor 2 in the lower part thereof. 7 is extended. Pre-formed side forming materials 5 on both sides are arranged at predetermined positions in a cavity of a forming die (not shown), and the reinforcing fiber base material constituting the floor forming material 3 is the flange portion 7 of the side forming material 5. , One side surface 8 forming the slope of each side forming material 5, and three different surfaces of the top surface 9 of each side forming material 5 are disposed in the mold. Resin (matrix resin) is injected into the mold, the resin injected into the reinforcing fiber base disposed in the mold is impregnated, and the resin is cured, whereby the floor forming material 3 is RTM-molded. Through the RTM molding of the floor forming material 3, the floor forming material 3 in which the reinforcing fiber base is impregnated with the resin and the side forming material 5 are joined and integrated to form a vehicle floor made of fiber reinforced resin. The structure 1 is produced.
　なお、フロア形成材３とサイド形成材５との接合部においては、例えば図２に示すように、サイド形成材５のフランジ部７に対向するフロア形成材３の部分と、それよりもフロア部２の中央部寄りのフロア形成材３の部分との間に、段差１０を設けたような構造を採ることもできる。 In addition, in the junction part of the floor forming material 3 and the side forming material 5, for example, as shown in FIG. 2, the portion of the floor forming material 3 facing the flange portion 7 of the side forming material 5 and the floor portion more than that. It is also possible to adopt a structure in which a step 10 is provided between the floor forming material 3 and the portion near the center of 2.
　図１に示したような実施態様においては、フロア形成材３とサイド形成材５とは、少なくとも互いに異なる２面で（本実施態様では３面で）接合、一体化されるので、両部材は確実にかつ強固に接合、一体化されることになり、繊維強化樹脂製車両用フロア構造体１全体として高い曲げ剛性や捩り剛性等の機械特性が発現されることになる。また、フロア形成材３のＲＴＭ成形を利用して上記接合、一体化が行われるので、単なるフロア形成材のＲＴＭ成形のみの場合と同等の簡単な成形工程にて、目標とする繊維強化樹脂製車両用フロア構造体１が容易にかつ確実に製造される。 In the embodiment as shown in FIG. 1, the floor forming material 3 and the side forming material 5 are joined and integrated at least on two different surfaces (three surfaces in this embodiment). As a result, the fiber-reinforced resin vehicle floor structure 1 as a whole is surely and firmly joined and integrated, and mechanical characteristics such as high bending rigidity and torsional rigidity are exhibited. In addition, since the above-mentioned joining and integration are performed by using the RTM molding of the floor forming material 3, it is made of a target fiber reinforced resin in a simple molding process equivalent to the case of only the RTM molding of the floor forming material. The vehicle floor structure 1 is easily and reliably manufactured.
　また、上記フロア形成材３とサイド形成材５とが接合、一体化されための、少なくとも互いに異なる２面のなす角度θ（図１に図示）としては、例えばフロア形成材３の水平面形成部分を基準として０度形成面とした場合、前述の如く、他方の面がなす角度θは、水平面に対し好ましくは１０～１２０度の範囲内にあることが好ましく、より好ましくは３０～９５度の範囲内、さらに好ましくは７０～９０度の範囲内、とくに好ましくは７５～８５度の範囲内である。 In addition, as an angle θ (shown in FIG. 1) between at least two different surfaces for joining and integrating the floor forming material 3 and the side forming material 5, for example, a horizontal plane forming portion of the floor forming material 3 is used. When the 0-degree forming surface is used as a reference, as described above, the angle θ formed by the other surface is preferably in the range of 10 to 120 degrees with respect to the horizontal plane, and more preferably in the range of 30 to 95 degrees. Of these, a range of 70 to 90 degrees is more preferable, and a range of 75 to 85 degrees is particularly preferable.
　また、上記フロア形成材３とサイド形成材５とが接合、一体化されための、少なくとも互いに異なる２面として、図３に別の実施態様を示すように、例えば、互いに隣接して異なる角度で広がる２面のみとする形態とすることもできる。図３に示す例では、サイド形成材１１に、上記と同様のフランジ部１２と、サイド形成材１１の側面を形成する斜面部をそのまま上方に延設した延設側面部１３が設けられており、フロア形成材１４がこれらフランジ部１２と、延設側面部１３を含むサイド形成材１１の側面部との互いに異なる２面に対し接合、一体化されている。 Further, as two different surfaces for joining and integrating the floor forming material 3 and the side forming material 5 at least as shown in FIG. 3, for example, adjacent to each other at different angles. It can also be set as the form which makes only two surfaces which spread. In the example shown in FIG. 3, the side forming material 11 is provided with a flange portion 12 similar to the above, and an extended side surface portion 13 in which a slope portion forming the side surface of the side forming material 11 extends upward as it is. The floor forming material 14 is joined and integrated with two different surfaces of the flange portion 12 and the side surface portion of the side forming material 11 including the extended side surface portion 13.
　また、本発明においては、例えば図４に示すように、前述したようなフロア形成材３とサイド形成材５とを接合により一体化するに際して、前述の予め成形した成形体または予備成形体と、上記フロア形成材３を構成する強化繊維基材との間に、接着剤の層１６を介在させることもできる。接着剤層１６の介在により、フロア形成材３とサイド形成材５とのより確実で強固な接合、一体化が可能になる。接着剤層１６に用いる接着剤としては、例えば、フィルム接着剤を用いることができる。 Further, in the present invention, for example, as shown in FIG. 4, when the floor forming material 3 and the side forming material 5 as described above are integrated by bonding, the previously formed molded body or the preformed body, An adhesive layer 16 may be interposed between the reinforcing fiber bases constituting the floor forming material 3. By the interposition of the adhesive layer 16, the floor forming material 3 and the side forming material 5 can be more reliably and firmly joined and integrated. As the adhesive used for the adhesive layer 16, for example, a film adhesive can be used.
　また、本発明においては、例えば図５に示すように、前述の予め成形した成形体または予備成形体を、フロア形成材１７を構成する強化繊維基材で囲い包むように配置することもできる。このようにすれば、フロア形成材１７とサイド形成材５とのより確実で強固な接合、一体化が可能になる。 Further, in the present invention, for example, as shown in FIG. 5, the above-mentioned preformed body or preform can be disposed so as to be surrounded by the reinforcing fiber base material constituting the floor forming material 17. In this way, the floor forming material 17 and the side forming material 5 can be more reliably and firmly joined and integrated.
　また、本発明において、サイド形成材は、最終的に製造される繊維強化樹脂製車両用フロア構造体のサイド部が閉断面の横断面形状を有するように予め作製されていればよく、サイド形成材自体としては、横断面に開放部を有する成形体または予備成形体として作製しておくことも可能である。予め作製されるサイド形成材が、横断面に開放部を有する成形体または予備成形体として作製される場合を、図６～図８に例示する。 In the present invention, the side forming material may be prepared in advance so that the side portion of the finally produced fiber reinforced resin vehicle floor structure has a cross-sectional shape of a closed cross section. The material itself can be prepared as a molded body or a preformed body having an open portion in the cross section. Examples of the case where the side forming material prepared in advance is manufactured as a molded body or a preformed body having an open portion in the cross section are illustrated in FIGS.
　図６に示す例では、サイド形成材２１が、開放部２２を有する成形体または予備成形体として予め作製され、このサイド形成材２１に対してフロア形成材２３がＲＴＭ成形を利用して接合、一体化され、最終的にサイド部の閉断面構造が完成される。フロア形成材２３のＲＴＭ成形に際し、樹脂が含浸される強化繊維基材を型内で所定の形態に保つために、サイド形成材２１内部に、とくにその開放部２２部分において（つまり、閉断面構造を形成するための開放部２２部分において）、例えば、風船型の膨縮可能な弾性体からなる中子を配置しておき、該中子内を加圧した状態でＲＴＭ成形を実施することができる。あるいは、開放部２２を閉塞するように比較的厚手の樹脂フィルムを配置しておき、その樹脂フィルムで、フロア形成材２３のＲＴＭ成形時にフロア形成材２３側からかかる樹脂圧に対抗するようにＲＴＭ成形用の強化繊維基材を支持するようにすることも可能である。 In the example shown in FIG. 6, the side forming material 21 is prepared in advance as a molded body or a preformed body having the opening 22, and the floor forming material 23 is joined to the side forming material 21 using RTM molding. It is integrated and the closed cross-section structure of a side part is finally completed. During the RTM molding of the floor forming material 23, in order to keep the reinforcing fiber base impregnated with the resin in a predetermined form in the mold, particularly in the open portion 22 portion (that is, the closed section structure). For example, a balloon-shaped core that can be expanded and contracted is arranged, and RTM molding is performed in a state where the inside of the core is pressurized. it can. Alternatively, a relatively thick resin film is disposed so as to close the open portion 22, and the RTM is applied to the resin film from the floor forming material 23 side during the RTM molding of the floor forming material 23. It is also possible to support a reinforcing fiber substrate for molding.
　図７に示す例では、サイド形成材３１が、開放部３２を有する成形体または予備成形体として予め作製され、サイド形成材３１に、図３に示したのと同様に、水平方向に延びるフランジ部３３と、斜め上方に延びる延設側面部３４が設けられており、このサイド形成材３１に対してフロア形成材３５がＲＴＭ成形を利用して接合、一体化され、最終的にサイド部の閉断面構造が完成される。 In the example shown in FIG. 7, the side forming material 31 is manufactured in advance as a molded body or a preformed body having the open portion 32, and the side forming material 31 has a flange extending in the horizontal direction as shown in FIG. 3. Part 33 and an extended side surface part 34 extending obliquely upward, and a floor forming material 35 is joined to and integrated with this side forming material 31 using RTM molding, and finally the side portion A closed cross-sectional structure is completed.
　図８に示す例では、サイド形成材４１が、開放部４２を有する略Ｌ字形の成形体または予備成形体として予め作製され、サイド形成材４１の下部に、水平方向に延びるフランジ部４３が設けられるとともに、上部にも水平方向に延びるフランジ部４４が設けられており、このサイド形成材４１に対してフロア形成材４５がＲＴＭ成形を利用して接合、一体化され、最終的にサイド部の閉断面構造が完成される。 In the example shown in FIG. 8, the side forming material 41 is produced in advance as a substantially L-shaped molded body or preform having an open portion 42, and a flange portion 43 extending in the horizontal direction is provided below the side forming material 41. In addition, a flange portion 44 extending in the horizontal direction is also provided at the upper portion, and a floor forming material 45 is joined and integrated to the side forming material 41 using RTM molding, and finally the side portion A closed cross-sectional structure is completed.
　さらに、図９に示すように、サイド形成材５１を、フロア形成材５２の中央部に向けてより長く延びる形状に形成しておくこともできる。このようにすれば、サイド形成材５１とフロア形成材５２との接合部をより長くとることが可能になり、両部材の接合強度、ひいては構造体全体としての機械特性の向上をはかることが可能になる。さらにまた、機械特性の一層の向上をはかるために、サイド形成材５１、フロア形成材５２の少なくとも一方の適当な部位に、凹凸構造５３を設けておくことも可能である。 Furthermore, as shown in FIG. 9, the side forming material 51 can be formed in a shape extending longer toward the center of the floor forming material 52. In this way, the joint between the side forming material 51 and the floor forming material 52 can be made longer, and the joint strength of both members, and hence the mechanical properties of the entire structure can be improved. become. Furthermore, in order to further improve the mechanical characteristics, it is possible to provide a concavo-convex structure 53 in an appropriate portion of at least one of the side forming material 51 and the floor forming material 52.
　以上の各実施態様は、あくまで例示であって、本発明は、特許請求の範囲に記載された構成のすべてを含むものである。 Each of the above embodiments is merely an example, and the present invention includes all the configurations described in the claims.
　本発明に係る繊維強化樹脂製車両用フロア構造体およびその製造方法は、軽量化等を目標とするあらゆる車両に適用できる。 The fiber reinforced resin vehicle floor structure and its manufacturing method according to the present invention can be applied to any vehicle aimed at weight reduction and the like.
１　繊維強化樹脂製車両用フロア構造体
２　フロア部
３　フロア形成材
４　サイド部
５　サイド形成材
６　コア材
７　フランジ部
８　一側面
９　上面
１０　段差
１１、２１、３１、４１、５１　サイド形成材
１２、３３、４３　フランジ部
１３、３４　延設側面部
１４、１７、２３、３５、４５、５２　フロア形成材
１６　接着剤の層
２２、３２、４２　開放部
４４　フランジ部
５３　凹凸構造 DESCRIPTION OF SYMBOLS 1 Floor structure 2 for vehicles made from fiber reinforced resin Floor part 3 Floor formation material 4 Side part 5 Side formation material 6 Core material 7 Flange part 8 One side surface 9 Upper surface 10 Level difference 11, 21, 31, 41, 51 Side formation material 12 , 33, 43 Flange portions 13, 34 Extended side portions 14, 17, 23, 35, 45, 52 Floor forming material 16 Adhesive layers 22, 32, 42 Open portion 44 Flange portion 53 Uneven structure

Claims (24)

  1. 　車両幅方向と車両前後方向に延びるフロア部を形成するためのフロア形成材と、該フロア部の車両幅方向両側部位で車両前後方向に延び、横断面が閉断面に形成されたサイド部を形成するためのサイド形成材とが一体化された繊維強化樹脂製車両用フロア構造体を製造する方法であって、前記サイド形成材を、前記サイド部の少なくとも一部を予め成形した成形体または予備成形体として作製し、該サイド形成材を型内の所定位置に配置し、前記フロア形成材を構成する強化繊維基材を、前記サイド形成材と少なくとも互いに異なる２面で接するように型内に配置し、該強化繊維基材に樹脂を注入、含浸し、前記強化繊維基材に樹脂が含浸された前記フロア形成材と前記サイド形成材とを接合により一体化することを特徴とする繊維強化樹脂製車両用フロア構造体の製造方法。 A floor forming material for forming a floor portion extending in the vehicle width direction and the vehicle front-rear direction, and a side portion that extends in the vehicle front-rear direction at both sides of the floor portion in the vehicle width direction and has a cross section formed as a closed cross section A method of manufacturing a fiber reinforced resin vehicle floor structure integrated with a side forming material for forming the side forming material, wherein the side forming material is a molded body in which at least a part of the side portion is molded in advance or a preliminary Produced as a molded body, the side forming material is disposed at a predetermined position in the mold, and the reinforcing fiber base constituting the floor forming material is placed in the mold so as to be in contact with at least two surfaces different from the side forming material. Fiber reinforcement comprising: arranging, injecting and impregnating a resin into the reinforcing fiber base, and integrating the floor forming material and the side forming material in which the reinforcing fiber base is impregnated with the resin by bonding Tree Manufacturing method of manufacturing a vehicle floor structure.
  2. 　前記予め成形した成形体または予備成形体と、前記フロア形成材を構成する強化繊維基材との間に、接着剤の層を介在させる、請求項１に記載の繊維強化樹脂製車両用フロア構造体の製造方法。 2. The fiber reinforced resin vehicle floor structure according to claim 1, wherein an adhesive layer is interposed between the preformed molded body or preformed body and the reinforcing fiber base material constituting the floor forming material. Body manufacturing method.
  3. 　前記接着剤がフィルム接着剤である、請求項２に記載の繊維強化樹脂製車両用フロア構造体の製造方法。 3. The method for manufacturing a fiber reinforced resin vehicle floor structure according to claim 2, wherein the adhesive is a film adhesive.
  4. 　前記サイド部の横断面を角形閉断面に形成する、請求項１～３のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The method of manufacturing a fiber reinforced resin vehicle floor structure according to any one of claims 1 to 3, wherein a lateral cross section of the side portion is formed into a square closed cross section.
  5. 　前記サイド形成材を、横断面が閉断面に形成された成形体または予備成形体として作製する、請求項１～４のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The method for producing a fiber reinforced resin vehicle floor structure according to any one of claims 1 to 4, wherein the side forming material is produced as a molded body or a preformed body having a closed cross section.
  6. 　前記サイド形成材を、横断面に開放部を有する成形体または予備成形体として作製し、該サイド形成材と前記フロア形成材との一体化により、前記サイド部における閉断面の横断面を形成する、請求項１～４のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The side forming material is produced as a molded body or a preformed body having an open portion in a cross section, and a cross section having a closed cross section in the side portion is formed by integrating the side forming material and the floor forming material. A method for producing a floor structure for a vehicle made of fiber-reinforced resin according to any one of claims 1 to 4.
  7. 　前記予め成形した成形体または予備成形体を、前記フロア形成材を構成する強化繊維基材で囲い包む、請求項１～６のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The method for producing a fiber-reinforced resin vehicle floor structure according to any one of claims 1 to 6, wherein the preformed or preformed body is surrounded by a reinforcing fiber base material constituting the floor forming material. .
  8. 　前記サイド部における閉断面の横断面の中空部内にコア材が配置されている、請求項１～７のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The method for manufacturing a fiber reinforced resin vehicle floor structure according to any one of claims 1 to 7, wherein a core material is disposed in a hollow portion of a cross section of a closed cross section in the side section.
  9. 　前記少なくとも互いに異なる２面として、水平面に対し互いに異なる角度で広がる２面を含む、請求項１～８のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The method for manufacturing a fiber reinforced resin vehicle floor structure according to any one of claims 1 to 8, wherein the at least two different surfaces include two surfaces extending at different angles with respect to a horizontal plane.
  10. 　前記少なくとも互いに異なる２面として、水平面に対し同じ角度で広がる２面を含む、請求項１～９のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 10. The method for manufacturing a fiber-reinforced resin vehicle floor structure according to any one of claims 1 to 9, wherein the at least two different surfaces include two surfaces extending at the same angle with respect to a horizontal plane.
  11. 　前記サイド部が車両前後方向に非直線状に延びている、請求項１～１０のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 The method for manufacturing a fiber reinforced resin vehicle floor structure according to any one of claims 1 to 10, wherein the side portion extends non-linearly in the vehicle longitudinal direction.
  12. 　強化繊維に炭素繊維が使用されている、請求項１～１１のいずれかに記載の繊維強化樹脂製車両用フロア構造体の製造方法。 12. The method for producing a fiber-reinforced resin vehicle floor structure according to claim 1, wherein carbon fibers are used as the reinforcing fibers.
  13. 　車両幅方向と車両前後方向に延びるフロア部を形成するためのフロア形成材と、該フロア部の車両幅方向両側部位で車両前後方向に延び、横断面が閉断面に形成されたサイド部の少なくとも一部を形成するための予め成形されたサイド形成材とが、該サイド形成材の少なくとも互いに異なる２面で、前記フロア形成材の成形による接合により一体化されていることを特徴とする繊維強化樹脂製車両用フロア構造体。 At least a floor forming material for forming a floor portion extending in the vehicle width direction and the vehicle front-rear direction, and a side portion extending in the vehicle front-rear direction at both sides of the floor portion in the vehicle width direction and having a cross section formed in a closed cross section Fiber reinforced, wherein a side-forming material pre-formed to form a part is integrated by joining the floor-forming material on at least two different surfaces of the side-forming material Resin vehicle floor structure.
  14. 　前記予め成形されたサイド形成材と、前記フロア形成材との間に、接着剤の層が介在されている、請求項１３に記載の繊維強化樹脂製車両用フロア構造体。 14. The fiber reinforced resin vehicle floor structure according to claim 13, wherein an adhesive layer is interposed between the preformed side forming material and the floor forming material.
  15. 　前記接着剤がフィルム接着剤である、請求項１４に記載の繊維強化樹脂製車両用フロア構造体。 15. The vehicle floor structure for a fiber reinforced resin according to claim 14, wherein the adhesive is a film adhesive.
  16. 　前記サイド部の横断面が角形閉断面に形成されている、請求項１３～１５のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 The fiber reinforced resin vehicle floor structure according to any one of claims 13 to 15, wherein a lateral cross section of the side portion is formed in a square closed cross section.
  17. 　前記サイド形成材の横断面が閉断面に形成されている、請求項１３～１６のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 The fiber reinforced resin vehicle floor structure according to any one of claims 13 to 16, wherein the side forming member has a closed cross section.
  18. 　前記サイド形成材の横断面が開放部を有している、請求項１３～１７のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 The fiber reinforced resin vehicle floor structure according to any one of claims 13 to 17, wherein a cross section of the side forming material has an open portion.
  19. 　前記サイド形成材が、前記フロア形成材で囲い包まれている、請求項１３～１８のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 19. The fiber reinforced resin vehicle floor structure according to claim 13, wherein the side forming material is surrounded by the floor forming material.
  20. 　前記サイド部における閉断面の横断面の中空部内にコア材が配置されている、請求項１３～１９のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 The fiber reinforced resin vehicle floor structure according to any one of claims 13 to 19, wherein a core material is disposed in a hollow portion of a transverse cross section of the closed cross section in the side portion.
  21. 　前記少なくとも互いに異なる２面として、水平面に対し互いに異なる角度で広がる２面を含む、請求項１３～２０のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 21. The fiber reinforced resin vehicle floor structure according to claim 13, wherein the at least two different surfaces include two surfaces extending at different angles with respect to a horizontal plane.
  22. 　前記少なくとも互いに異なる２面として、水平面に対し同じ角度で広がる２面を含む、請求項１３～２１のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 The fiber reinforced resin vehicle floor structure according to any one of claims 13 to 21, wherein the at least two different surfaces include two surfaces extending at the same angle with respect to a horizontal plane.
  23. 　前記サイド部が車両前後方向に非直線状に延びている、請求項１３～２２のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 The fiber reinforced resin vehicle floor structure according to any one of claims 13 to 22, wherein the side portion extends non-linearly in the vehicle longitudinal direction.
  24. 　強化繊維に炭素繊維が使用されている、請求項１３～２３のいずれかに記載の繊維強化樹脂製車両用フロア構造体。 24. The floor structure for a vehicle made of fiber reinforced resin according to any one of claims 13 to 23, wherein carbon fiber is used as the reinforcing fiber.
PCT/JP2014/056667 2013-03-27 2014-03-13 Fiber-reinforced resinous vehicular floor structure and manufacturing method of same WO2014156682A1 (en)

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US20160059904A1 (en) * 2013-05-16 2016-03-03 Bayerische Motoren Werke Aktiengesellschaft Crash Structure for a Vehicle
CN111469936A (en) * 2020-04-26 2020-07-31 中航复合材料有限责任公司 Composite front floor single bottom plate of passenger car and preparation method thereof
EP3805078A4 (en) * 2018-06-05 2021-06-16 Nissan Motor Co., Ltd. Vehicle body structure and method for manufacturing vehicle body

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EP3805078A4 (en) * 2018-06-05 2021-06-16 Nissan Motor Co., Ltd. Vehicle body structure and method for manufacturing vehicle body
CN111469936A (en) * 2020-04-26 2020-07-31 中航复合材料有限责任公司 Composite front floor single bottom plate of passenger car and preparation method thereof

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