JP2014000837A - Frp cabin for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance load support performance of an insert member when a sub frame that supports a suspension device is fastened to the insert member embedded in an FRP panel.SOLUTION: A sub frame 91 supporting a suspension device is fastened to an insert member 93 embedded in a core material 43 of an inclined wall 37 of a dash panel 21. The core material 43 comprises a corrugated plate having a large number of irregularities 43a extending in the forward/backward direction. One apex a of the insert member 93 having a triangular shape in plane view is oriented to outside or inside in the vehicle width direction, and two edges B, C sandwiching the apex a abut on the core material 43. Thus when a load in the vehicle width direction is input from the suspension device to the sub frame 91, the load is dispersed and absorbed from the two edges B, C sandwiching one apex a of the insert member 93 to the core material 43 of the inclined wall 37 of the dash panel 21. As a result, support rigidity of the sub frame 91 relative to the inclined wall 37 of the dash panel 21 can be enhanced without complicating the structure of the insert member 93.

Description

  The present invention relates to a subframe in which an FRP cabin includes a panel configured by sandwiching a core material between an inner skin located on the vehicle interior side and an outer skin located on the vehicle interior side, and supports the suspension device. The present invention relates to an FRP cabin for automobiles that is fastened to an insert member embedded in the core material.

  An insert embedded in a predetermined position of CFRP (carbon fiber reinforced resin) includes a core material made of balsa material, a metal insert member held inside the core material, and CFRP covering the surfaces of the core material and the insert member The one composed of a coating layer made of a metal is known from Patent Document 1 below.

  A car cabin floor panel molded in a bathtub shape with CFRP is formed by sandwiching a foam core between the upper and lower walls, and a metal collar body inserted into the floor panel from the lower wall side to the upper wall side. Japanese Patent Application Laid-Open No. 2004-228867 discloses a technique for fixing a seat to a floor panel by abutting a washer from the upper wall side to the upper end and screwing a bolt that penetrates the seat rail and the washer into the collar body.

JP 2006-175606 A JP 2010-208445 A

  By the way, what was described in the said patent document 1 is because insert is comprised with a core material, an insert member, and a coating layer, the structure of insert becomes complicated and becomes a factor of a cost increase, The dimension is large. There is a problem in that it lacks versatility.

  In addition, what is described in Patent Document 2 is that the collar body as an insert member is a simple cylindrical member, and it is difficult to efficiently transmit the load input to the collar body to the foam core. It is necessary to embed a CFRP cylindrical insert body in contact with the outer peripheral surface of the foam core and reinforce it in the foam core, resulting in an increase in the number of parts and an increase in cost.

  The present invention has been made in view of the above circumstances, and aims to enhance the load support performance of an insert member when the sub frame supporting the suspension device is fastened to the insert member embedded in the FRP panel. To do.

  In order to achieve the above object, according to the first aspect of the present invention, the FRP cabin has a core material between the inner skin located on the vehicle interior side and the outer skin located on the vehicle exterior side. An automobile FRP cabin having a panel constituted by sandwiching and fastening a subframe supporting a suspension device to an insert member embedded in the core material, and a plurality of uneven portions extending in the front-rear direction of the core material One apex of the insert member having a triangular shape in plan view is directed outward or inward in the vehicle width direction, and two sides sandwiching the apex are in contact with the core material A featured FRP cabin of an automobile is proposed.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, a subframe support member that supports the subframe is fastened to the insert member at three vertices of the triangle, and the subframe is provided. A bulging portion that bulges into the insert member is formed in the support member, and a bolt hole into which a bolt that fastens the subframe to the subframe support member is screwed is extended into the bulging portion. A car FRP cabin is proposed.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the insert is provided with the outer skin sandwiched between the subframe support member and the insert member. The insert member and the subframe support member are fastened with a first bolt inserted from the inner skin side into a fastening hole formed in the member, and the second bolt inserted from the inner skin side into the fastening hole. An automobile FRP cabin is proposed in which an inner skin is fastened to the insert member.

  According to the invention described in claim 4, in addition to the structure of any one of claims 1 to 3, the cabin includes side sills extending rearward from both sides in the vehicle width direction of the panel, An automobile FRP cabin is proposed in which the front end of a partition member that partitions the inside of the side sill into an upper space and a lower space is positioned in the vicinity of the insert member.

  According to the invention described in claim 5, in addition to the configuration of any one of claims 1 to 4, the front floor panel connected to the rear of the panel is provided between the inner skin and the outer skin. A core material made of a corrugated sheet having a large number of irregularities extending in the front-rear direction, wherein the irregularities of the core material of the panel are continuous with the irregularities of the core material of the front floor panel. An FRP cabin is proposed.

  The inclined wall 37 of the embodiment corresponds to the panel of the present invention, the front partition member 47 of the embodiment corresponds to the partition member of the present invention, and the front subframe 91 of the embodiment corresponds to the sub-panel of the present invention. Corresponding to the frame, the front insert member 93 of the embodiment corresponds to the insert member of the present invention, and the bolt hole 93a, the large diameter hole 93b and the small diameter hole 93c of the embodiment correspond to the fastening hole of the present invention.

  According to the configuration of claim 1, the FRP cabin includes a panel configured by sandwiching a core material between an inner skin positioned on the vehicle interior side and an outer skin positioned on the vehicle exterior side, and the suspension device The sub-frame that supports is fastened to the insert member embedded in the core material. The core material is composed of a corrugated plate having a number of irregularities extending in the front-rear direction, and one apex of the insert member that forms a triangle shape in plan view is directed to the outside or the inside in the vehicle width direction, and two sides sandwiching the apex Since it is in contact with the core material, when a load in the vehicle width direction is input from the suspension device to the subframe, the load is dispersed and absorbed from the two sides sandwiching one apex of the insert member to the core material of the panel. Thus, the support rigidity of the subframe with respect to the panel can be increased without complicating the structure of the insert member.

  According to the second aspect of the present invention, the sub-frame support member that supports the sub-frame is fastened to the insert member at the three vertices of the triangle, and the bulge portion that bulges into the insert member is formed in the sub-frame support member. Since the bolt hole to which the bolt for fastening the subframe to the subframe support member is screwed is extended in the bulging portion, the subframe support member is reduced in size while reducing the amount of protrusion from the insert member. A bolt hole into which a bolt to be fastened to the frame support member is screwed can be formed long to increase the fastening force.

  According to the configuration of claim 3, the first bolt inserted from the inner skin side into the fastening hole formed in the insert member with the outer skin sandwiched between the subframe support member and the insert member. Since the member and the subframe support member are fastened and the inner skin is fastened to the insert member with the second bolt inserted from the inner skin side into the fastening hole, the first bolt and the second bolt are used as a common fastening hole. It is possible to insert from the inner skin side, and not only can the workability be improved by operating the first and second bolts from the passenger compartment side where the inner skin faces, but the structure is simplified by reducing the number of fastening holes. Can be In addition, since the fastening hole does not open on the outer skin side, it is possible to prevent water or the like from entering the vehicle compartment through the fastening hole.

  According to the fourth aspect of the present invention, the cabin includes side sills that extend rearward from the left and right sides of the panel in the vehicle width direction, and the front end of the partition member that partitions the inside of the side sill into the upper space and the lower space is positioned in the vicinity of the insert member. Since it was made to do, the load input into the core material of the panel from the insert member can be efficiently disperse | distributed and supported to a side sill via a partition member.

  According to the configuration of claim 5, the front floor panel connected to the rear of the panel is configured by sandwiching a core material made of a corrugated plate having a number of uneven portions extending in the front-rear direction between the inner skin and the outer skin, Since the uneven part of the core material of the panel is continuous with the uneven part of the core material of the front floor panel, the load input from the insert member to the core material of the panel should be efficiently distributed and supported on the core material of the front floor panel Can do.

The perspective view of the cabin made from CFRP of a car. The partial perspective view of the cabin which removed the inner skin. FIG. 3 is a three-direction arrow view of FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is an enlarged view of 6 parts in FIG. 5.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Note that the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction in this specification are based on the driver seated in the driver's seat.

  As shown in FIG. 1, the body frame of an automobile is a cabin 11 formed in a bathtub shape with carbon fiber reinforced resin (CFRP), and a pair of left and right suspension support modules that are cast parts of an aluminum alloy connected to the front end of the cabin 11. 12, 12, a pair of left and right front side frame front parts 13, 13 made of an aluminum alloy extruded material that extends forward from the front ends of the suspension support modules 12, 12, and the front ends of the front side frame front parts 13, 13. A front end module 14 made of CFRP, a pair of left and right CFRP lower members 15, 15 extending from the left and right ends of the front end module 14, and a rear upper portion of the lower members 15, 15 extending rearward and upward. A pair of CFRP left and right connected to the front end Comprises a Pamenba 16, 16, the roll bar 17 made of CFRP erected on the upper rear surface of the cabin 11, a CFRP-made left and right pair of stays 18 and 18 for reinforcing supporting the roll bar 17 from the rear.

  The cabin 11 has a hollow structure in which an inner skin 19 and an outer skin 20 are joined up and down, a dash panel 21 at the front end, a pair of left and right side sills 22, 22 extending rearward from both ends of the dash panel 21 in the vehicle width direction, and a side sill 22. 22, a pair of left and right rear side frames 23, 23 extending rearward and upward from the rear end, a rear end cross member 24 connecting the rear ends of the rear side frames 23, 23 in the vehicle width direction, a dash panel 21 and left and right side sills 22 , 22, a kick-up portion 26 rising from the rear end of the front floor panel 25, and extending rearward from the upper end of the kick-up portion 26 to connect to the rear side frames 23, 23 and the rear end cross member 24. And a rear floor panel 27.

  The front end module 14 includes a bumper beam 28 extending in the vehicle width direction, and a pair of left and right bumper beam extensions that extend rearward from both ends of the bumper beam 28 in the vehicle width direction and are connected to the front ends of the front side frame front portions 13 and 13. 29 and 29 and a frame-shaped front bulkhead 30 supported between the bumper beam extensions 29 and 29. Each suspension support module 12 includes a front side frame rear portion 31 connected to the rear end of the front side frame front portion 13 and the front surface of the dash panel 21, and extends outward and upward in the vehicle width direction from the front side frame rear portion 31. A damper housing 32 connected to the front surface of the dash panel 21 is integrally provided. The left and right end portions of the dash panel 21 constitute a pair of left and right front pillar lower front portions 33 and 33 that rise upward from the front ends of the side sills 22 and 22. A pair of left and right metal front pillar lower rear portions 34 and 34 and a pair of left and right metal front pillar uppers 35 and 35 are connected to the rear surfaces of the front pillar lower front portions 33 and 33, and the left and right front pillar uppers 35 and 35 are connected to each other. The upper ends are connected by a metal front roof arch 36 extending in the vehicle width direction.

  The dash panel 21 includes an inclined wall 37 that extends obliquely upward from the front end of the front floor panel 25, and a vertical wall 38 that extends upward from the front end of the inclined wall 37. A floor tunnel 39 extending in the front-rear direction protrudes upward from the center in the vehicle width direction of the inner skin 19 and the outer skin 20 constituting the inclined wall 37 of the dash panel 21 and the upper and lower surfaces of the front floor panel 25. Further, a front cross member 40 and a rear cross member 41 that extend in the vehicle width direction intersecting the floor tunnel 39 bulge upward from the inner skin 19 constituting the upper surface of the front floor panel 25. On the other hand, in the rear floor panel 27, the inner skin 19 and the outer skin 20 are both formed flat.

  Below the dash panel 21, a front subframe 91 that supports left and right front wheel suspension devices 90 (see FIG. 3) is mounted.

  As shown in FIGS. 1 and 2, the inner skin 19 and the outer skin 20 constituting the cabin 11 are arranged on the outer periphery of a dash panel 21, left and right side sills 22 and 22, left and right rear side frames 23 and 23, and a rear end cross member 24. Joint flanges 19a and 20a extending so as to surround are provided, and both the joint flanges 19a and 20a are joined by adhesion, welding, rivets or the like.

  The front floor panel 25 includes left and right core members 42 and 42 made of corrugated plates sandwiched between the inner skin 19 and the outer skin 20. The core material 42 sandwiched between the side sill 22 and the floor tunnel 39 is an integrally formed member, and includes a plurality of concave and convex portions 42a. The inclined wall 37 of the dash panel 21 includes a corrugated core material 43 sandwiched between the inner skin 19 and the outer skin 20, and the uneven portion 43a extending in the front-rear direction of the core material 43 is a front floor. The front end of the concavo-convex part 42a of the core material 42 of the panel 25 is tangentially continuous. The vertical wall 38, the kick-up portion 26, and the rear floor panel 27 of the dash panel 21 include corrugated core members 44, 45, 46 sandwiched between the inner skin 19 and the outer skin 20, respectively. The concavo-convex portions 44a ... 45a ... 46a ... of the core members 44, 45, 46 all extend in the vehicle width direction.

  The side sill 22 has an inner wall 22c, an outer wall 22d, an upper wall 22e, and a lower wall 22f and has a closed cross section, and a front floor panel 25 is connected to the lower wall 22f (see FIGS. 1 and 3). The interior of the side sill 22 is partitioned into an upper space 22a and a lower space 22b by a front partition member 47 that is disposed in the horizontal direction and extends in the front-rear direction (see FIG. 2). An upper energy absorbing member 52 that bends zigzag is disposed between the upper surface of the front partition member 47 and the upper wall 22e of the side sill 22, and between the lower surface of the front partition member 47 and the lower wall 22f of the side sill 22 A lower energy absorbing member 53 that bends zigzag is disposed.

  Further, a front connecting plate 48 that extends forward from the upper wall 22e of the side sill 22 and is connected to a wheel house rear wall 33a that constitutes a front wall of the front pillar lower front portion 33 is disposed. At the rear, rear first and second connecting plates 49 and 50 are connected to the front surface of the bulkhead 45b extending rearward from the upper wall 22e and extending the core material 45 of the kick-up portion 26 outward in the vehicle width direction. Be placed.

  The front sub-frame 91 is a plate-like member that is long in the vehicle width direction, and is fastened to the lower surface of the cabin 11 at three locations on the left and right. That is, the front portion of the front subframe 91 is fastened to the lower surface of the front side frame rear portion 31 of the suspension support module 12 with the bolt 92 (see FIG. 5). Further, the intermediate portion in the front-rear direction of the front subframe 91 is fastened with a metal subframe support member 94 on the lower surface of a metal front insert member 93 embedded in the core material 43 of the inclined wall 37 of the dash panel 21. Fastened to the lower surface of the subframe support member 94 with bolts 95 (see FIGS. 4 to 6). The rear portion of the front subframe 91 is fastened with a bolt 97 to the lower surface of a metal rear insert member 96 embedded in the core material 43 of the inclined wall 37 of the dash panel 21 (see FIGS. 4 and 5).

  The rear insert member 96 is a thin cylindrical member, and is disposed perpendicular to the front floor panel 25 and oblique to the inclined wall 37 of the dash panel 21. On the other hand, the front insert member 93 is a thick triangular prism-shaped member, and is disposed perpendicular to the inclined wall 37 of the dash panel 21.

  Hereinafter, the structures of the front insert member 93 and the subframe support member 94 will be described with reference to FIGS.

  The cross section of the front insert member 93 is a right-angled isosceles triangle formed by rounding three vertices a, b, and c, the base A is aligned in the front-rear direction, and the two vertices b, c and the base A are the vehicle width. The core material 43 is embedded so that one apex a and the two oblique sides B and C are located outside in the vehicle width direction. A bolt hole 93a, a large diameter hole 93b, a small diameter hole 93c, and a fitting hole 93d are formed coaxially from the upper surface 93e to the lower surface 93f in the vicinity of each of the three thick apexes a, b, and c. Is done. The inside of the front insert member 93 surrounded by the three vertices a, b, and c is hollow, and there is a Y-shaped rib 93g that connects the three vertices a, b, and c to the upper side from the lower surface 93f. A spherical wall 93h that is recessed toward is formed. With the front insert member 93 embedded in the core material 43, the upper surface 93 e of the front insert member 93 contacts the lower surface of the inner skin 19, and the lower surface 93 f of the front insert member 93 contacts the upper surface of the outer skin 20. .

  The sub-frame support member 94 is moved upward from a position surrounded by the three fitting protrusions 94a to be fitted into the three fitting holes 93d of the front insert member 93 and the three fitting protrusions 94a. Are formed at the center of the bulging portion 94b that bulges into the spherical wall 93h of the front insert member 93, the horizontal fastening seat 94c that contacts the upper surface of the front subframe 91, and the fitting protrusion 94a. Bolt holes 94d ... and bolt holes 94e extending from the fastening seats 94c into the bulging portion 94b are provided.

  Therefore, the sub-frame support member 94 is approached from the lower surface 93f side of the front insert member 93 embedded in the core member 43 of the inclined wall 37 of the dash panel 21, and the three fitting protrusions 94a. In a state where the portion 94b is fitted into the three fitting holes 93d of the front insert member 93 and the one spherical wall 93h, the three first bolts 98 are fitted to the bolt holes 93a of the front insert member 93. The large diameter holes 93b and the small diameter holes 93c are inserted into the bolt holes 94d of the sub-frame support member 94. As a result, the opening edge of the outer skin 20 is sandwiched between the outer flange portion 94f of the subframe support member 94 and the lower surface 93f of the front insert member 93, and the outer skin 20 and the subframe support are supported by the front insert member 93. The member 94 is fixed.

  Subsequently, the three second bolts 99 are screwed into the three bolt holes 93a of the front insert member 93 so that the opening edge of the inner skin 19 becomes the head 99a of the second bolt 99. The inner skin 19 is fixed to the front insert member 93 by being sandwiched between the upper surface 93 e of the front insert member 93. When the front insert member 93 and the subframe support member 94 are fixed to the inclined wall 37 of the dash panel 21 in this way, the bolt 95 that passes through the front subframe 91 from the bottom to the top is fastened to the subframe support member 94. The middle part in the front-rear direction of the front sub-frame 91 is fastened to the front sub-frame 91 by screwing into a bolt hole 94e that opens in the seat 94c.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  Since the front subframe 91 supported on the front lower part of the cabin 11 is provided with left and right suspension devices 90, 90, the front subframe 91 is attached to the cabin 11 so as to withstand the load input from the suspension devices 90, 90. It is necessary to fix it firmly. In particular, when the vehicle is turning at high speed, a large side force input from the road surface to the front wheels acts as a large load in the vehicle width direction on the front subframe 91 via the suspension devices 90 and 90. At this time, the base end of the lower arm 90a on the front side of the suspension device 90 is supported in the vicinity of the position where the front subframe 91 is fixed to the metal front side frame rear portion 31 with the bolt 92 (FIGS. 3 and 4). Reference) and sufficient support strength can be secured. On the other hand, the proximal end of the lower arm 90b on the rear side of the suspension device 90 is in the vicinity of the position where the front subframe 91 is fixed to the front insert member 93 embedded in the inclined wall 37 of the dash panel 21 made of CFRP with the bolt 95. Since it is supported (refer to FIG. 3 and FIG. 4), the support strength may be insufficient.

  However, according to the present embodiment, the inclined wall 37 in which the front insert member 93 is embedded sandwiches the core material 43 made of a corrugated plate having a large number of uneven portions 43 a between the inner skin 19 and the outer skin 20. Therefore, the support strength of the front insert member 93 with respect to the inclined wall 37 is increased. Moreover, in the front insert member 93 having a triangular shape in plan view, one apex a is directed to the outside in the vehicle width direction, and two sides B and C sandwiching the apex a are in contact with the core member 43 (see FIG. 4), when a load in the vehicle width direction is inputted from the lower arm 60b (see FIG. 3) on the rear side of the suspension device 90 to the front subframe 91, the load is sandwiched between two apexes a of the front insert member 93. By dispersing and absorbing from one side B, C to the core material 43 of the inclined wall 37, the support strength of the front subframe 91 with respect to the inclined wall 37 is further increased without complicating the structure of the front insert member 93. be able to.

  Further, the subframe support member 94 for fastening the front subframe 91 is fastened with the first bolts 98 in the vicinity of the three apexes a, b, c of the triangle of the front insert member 93, and the subframe support member 94 is A bulging portion 94b that fits into the spherical wall 93h of the portion insert member 93 is formed, and a bolt hole 94e into which a bolt 95 that fastens the front subframe 91 to the subframe support member 94 is screwed is extended into the bulging portion 94b. Therefore (see FIG. 6), the bolt 95 for fastening the front subframe 91 to the subframe support member 94 while reducing the size of the subframe support member 94 to reduce the downward projection from the front insert member 93 is provided. The bolt hole 94e to be screwed can be formed long to increase the fastening force.

  Further, bolt holes 93a, which are fastening holes formed in the front insert member 93 in a state where the outer skin 20 is sandwiched between the flange 94f of the subframe support member 94 and the lower surface 93f of the front insert member 93, are large. The front insert member 93 and the sub-frame support member 94 are fastened with the first bolts 98 inserted from the inner skin 19 side into the diameter holes 93b... And the small diameter holes 93c from the inner skin 19 side. Since the inner skin 19 is fastened to the front insert member 93 with the inserted second bolts 99 (see FIG. 6), the first bolts 98 and the second bolts 99 are connected to the common fastening hole from the inner skin 19 side. It becomes possible to insert, and the first and second bolts 98, 99,... Are operated from the passenger compartment side where the inner skin 19 faces to improve workability. Not only can Rukoto, the structure can be simplified by reducing the number of fastening holes. In addition, since the fastening hole does not open on the outer skin 20 side, it is possible to prevent water or the like from entering the vehicle compartment through the fastening hole.

  The cabin 11 includes side sills 22 extending rearward from both sides of the inclined wall 37 in the vehicle width direction, and the front end of the front partition member 47 that divides the inside of the side sill 22 into the upper space 22a and the lower space 22b. Since it is located in the vicinity, the load input from the front insert member 93 to the inclined wall 37 can be efficiently dispersed and supported on the side sill 22 via the front partition member 47.

  The front floor panel 25 connected to the rear of the inclined wall 37 is configured by sandwiching a core material 42 made of a corrugated plate having a large number of concavo-convex portions 42a extending in the front-rear direction between the inner skin 19 and the outer skin 20. Since the concavo-convex portions 43a of the core material 43 of the wall 37 are continuous with the concavo-convex portions 42a of the core material 42 of the front floor panel 24 (see FIG. 4), input from the front insert member 93 to the core material 43 of the inclined wall 37 It is possible to efficiently disperse and support the applied load on the core material 42 of the front floor panel 25.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the cabin 11 and the like are made of CFRP, but may be made of FRP (fiber reinforced resin) using fibers other than carbon fibers.

  Further, in the embodiment, the triangular apex “a” of the front insert member 93 faces the outside in the vehicle width direction, but the same effect can be obtained even if it faces the inside in the vehicle width direction.

  Further, the panel of the present invention is not limited to the inclined wall 37 of the dash panel 21 of the embodiment.

11 cabin 19 inner skin 20 outer skin 22 side sill 22a upper space 22b lower space 25 front floor panel 37 inclined wall (panel)
42 Core material 42a Uneven portion 43 Core material 43a Uneven portion 47 Front partition member (partition member)
90 Suspension device 91 Front subframe (subframe)
93 Front insert member (insert member)
93a Bolt hole (fastening hole)
93b Large-diameter hole (fastening hole)
93c Small-diameter hole (fastening hole)
94 Subframe support member 94b Swelling portion 94e Bolt hole 95 Bolt 98 First bolt 99 Second bolt

Claims (5)

A panel (37) in which an FRP cabin (11) sandwiches a core material (43) between an inner skin (19) located on the vehicle interior side and an outer skin (20) located on the vehicle exterior side. FRP cabin for an automobile for fastening a subframe (91) supporting the suspension device (90) to an insert member (93) embedded in the core material (43),
The core material (43) is formed of a corrugated plate having a number of concave and convex portions (43a) extending in the front-rear direction, and one apex (a) of the insert member (93) that forms a triangle shape in plan view is the vehicle width direction. An FRP cabin of an automobile, characterized in that two sides (B, C) sandwiching the apex (a) are in contact with the core material (43).   A subframe support member (94) that supports the subframe (91) is fastened to the insert member (93) at the three apexes (a, b, c) of the triangle, and is attached to the subframe support member (94). A bulging portion (94b) that bulges in the insert member (93) is formed, and a bolt hole (95) for screwing a bolt (95) that fastens the subframe (91) to the subframe support member (94). 94. The FRP cabin of a motor vehicle according to claim 1, wherein 94e) is extended into the bulging portion (94b).   Fastening holes (93a, 93b, 93c) formed in the insert member (93) in a state where the outer skin (20) is sandwiched between the sub-frame support member (94) and the insert member (93). The insert member (93) and the sub-frame support member (94) are fastened to the fastening holes (93a, 93b, 93c) by the first bolt (98) inserted from the inner skin (19) side. The automobile according to claim 1 or 2, wherein the inner skin (19) is fastened to the insert member (93) by a second bolt (99) inserted from the inner skin (19) side. FRP cabin.   The cabin (11) includes side sills (22) extending rearward from both sides of the panel (37) in the vehicle width direction, and partitions the interior of the side sill (22) into an upper space (22a) and a lower space (22b). The FRP cabin of an automobile according to any one of claims 1 to 3, wherein a front end of the member (47) is positioned in the vicinity of the insert member (93).   The front floor panel (25) connected to the rear of the panel (37) is a core made of a corrugated plate having a number of concave and convex portions (42a) extending in the front-rear direction between the inner skin (19) and the outer skin (20). An uneven portion (43a) of the core material (43) of the panel (37) is continuous with the uneven portion (42a) of the core material (42) of the front floor panel (25). The FRP cabin of an automobile according to any one of claims 1 to 4, wherein the cabin is made of FRP.

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