JP6294381B2 - Auto body structure - Google Patents

Description

  The present invention relates to a vehicle body structure for an automobile in which a metal frame member is screwed to an end portion in the front-rear direction of a floor made of FRP.

  A metal support member is bonded to the front wall of the FRP floor, a flange provided at the rear end of the metal front side frame is in contact with the front surface of the support member, and a bolt inserted from the front is attached to the front side frame. Japanese Patent Application Laid-Open No. 2004-151867 discloses that the flange, the support member, and the front wall of the floor are threaded and fastened to a nut.

Japanese Patent Laying-Open No. 2015-182587

  By the way, in addition to the front side frame, many frame members such as an upper member, a lower member, a damper housing, and a front bulkhead are arranged in front of the front wall of the floor, so the bolts for fixing the front side frame are inserted from the front. When trying to do so, there is a problem that the frame member gets in the way and the operator cannot secure a working space for operating the bolt, or the shape of the frame member is limited to secure a moving space for the tool that operates the bolt. there were.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to improve workability when a metal frame is fastened to a FRP floor panel with a bolt.

To achieve the above object, according to the first aspect of the present invention, there is provided a vehicle body structure for a vehicle in which a metal frame member is screwed to the front and rear end portions of an FRP floor panel, and the frame The member includes a frame mounting portion in which both side surfaces in the vehicle width direction of the vertical wall extending in the vertical direction and the front-rear direction are reinforced by a plurality of ribs, and the female screw provided in the region reinforced by the plurality of ribs of the frame mounting portion The frame mounting portion is fixed to the floor panel by screwing a bolt that penetrates a fastening hole formed in the front and rear direction end portion of the floor panel from the inside to the outside in the front and rear direction , and the frame. by bolt is screwed into a female screw portion formed on the lower surface of the front and rear ends of the mounting portion, it is characterized in that the front subframe is secured to the lower surface of the frame mounting portion Body structure of a vehicle is proposed.

According to a second aspect of the present invention, there is provided a vehicle body structure in which a metal frame member is screwed to a front and rear direction end portion of a floor panel made of FRP, and the frame member includes a vertical direction and a front and rear direction. A frame mounting portion reinforced by a plurality of ribs on both sides in the vehicle width direction of the vertical wall extending in the direction, and a female screw portion provided in an area reinforced by the plurality of ribs of the frame mounting portion, screwed bolt extending through the fastening hole formed in the longitudinal direction end portion in the direction inside to the outside front and rear, the front-rear direction ends of the floor panel which is configured by bonding the outer skin and the inner skin at the periphery joint flange of Includes a floor inclined portion inclined obliquely upward toward the front-rear direction outer side, and a floor standing portion rising upward from the front-rear direction outer end of the floor inclined portion, The frame mounting portion of the member includes a frame inclined portion that contacts the floor inclined portion and a frame standing portion that contacts the floor standing portion, and is disposed between the outer skin and the inner skin of the floor inclined portion. The bolt penetrating the metal collar is screwed into the female thread portion provided in the frame inclined portion, and the bolt penetrating the metal plate disposed on the inner surface in the front-rear direction of the inner skin of the floor standing portion is the frame. The metal plate is screwed into the female thread portion provided on the standing portion, and the metal plate is formed in a letter shape and bonded across the floor standing portion and the floor inclined portion, and the metal plate is disposed on the floor standing portion. There is proposed a vehicle body structure having a collar portion and a reinforcing rib which are fitted into a fastening hole of a portion .

According to a third aspect of the present invention, there is provided a vehicle body structure in which a metal frame member is screwed to a front and rear end portion of an FRP floor panel, and the frame member includes a vertical direction and a front and rear direction. A frame mounting portion reinforced by a plurality of ribs on both sides in the vehicle width direction of the vertical wall extending in the direction, and a female screw portion provided in an area reinforced by the plurality of ribs of the frame mounting portion, screwed bolt extending through the fastening hole formed in the longitudinal direction end portion in the direction inside to the outside front and rear, the front-rear direction ends of the floor panel which is configured by bonding the outer skin and the inner skin at the periphery joint flange of Includes a floor inclined portion inclined obliquely upward toward the front-rear direction outer side, and a floor standing portion rising upward from the front-rear direction outer end of the floor inclined portion, The frame mounting portion of the member includes a frame inclined portion that contacts the floor inclined portion and a frame standing portion that contacts the floor standing portion, and is disposed between the outer skin and the inner skin of the floor inclined portion. The bolt penetrating the metal collar is screwed into the female thread portion provided in the frame inclined portion, and the bolt penetrating the metal plate disposed on the inner surface in the front-rear direction of the inner skin of the floor standing portion is the frame. A side frame that is screwed into the female thread portion provided on the upright portion and is integrated with a side sill, a front pillar lower, and a rear pillar is joined to both sides in the vehicle width direction of the floor panel, and the floor panel includes the inner skin and A corrugated core sandwiched between the outer skins; The direction in which the peaks and valleys of the plate extend is the front-rear direction, the outer end in the vehicle width direction of the floor upright portion constitutes a part of the wheel house, and the frame mounting portion has a flange portion that covers a part of the wheel house. A vehicle body structure is proposed in which the metal plate is positioned on the inner side of the collar portion in the vehicle width direction, and the metal collar is positioned on the inner side of the metal plate in the vehicle width direction .

  According to the configuration of the first aspect, the metal frame member is screwed to the front-rear direction end of the FRP floor panel. The frame member includes a frame attachment portion in which both side surfaces in the vehicle width direction of the vertical wall extending in the vertical direction and the front-rear direction are reinforced with a plurality of ribs, and a female screw portion provided in a region reinforced with the plurality of ribs of the frame attachment portion In addition, since the bolts that pass through the fastening holes formed in the front and rear direction end portions of the floor panel from the front and rear direction inside to the outside are screwed together, it is possible to operate the bolts from the floor panel side to attach and detach the frame member. The work space can be secured without being affected by the shape and dimensions of the frame member, and workability is improved. In addition, the shape of the frame mounting part that requires strength can be determined without considering the movement space of the tool that operates the bolt, so that the cross-sectional area of the frame mounting part can be maximized to increase the strength against impact loads. Can do.

According to the structure of Claim 2 or Claim 3 , a metal frame member is screwed to the front-rear direction end of the FRP floor panel. The frame member includes a frame attachment portion in which both side surfaces in the vehicle width direction of the vertical wall extending in the vertical direction and the front-rear direction are reinforced with a plurality of ribs, and a female screw portion provided in a region reinforced with the plurality of ribs of the frame attachment portion In addition, since the bolts that pass through the fastening holes formed in the front and rear direction end portions of the floor panel from the front and rear direction inside to the outside are screwed together, it is possible to operate the bolts from the floor panel side to attach and detach the frame member. The work space can be secured without being affected by the shape and dimensions of the frame member, and workability is improved. In addition, the shape of the frame mounting part that requires strength can be determined without considering the movement space of the tool that operates the bolt, so that the cross-sectional area of the frame mounting part can be maximized to increase the strength against impact loads. Can do.

Moreover, the front and rear ends of the floor panel formed by bonding the outer skin and the inner skin with the peripheral joining flange are inclined to the front and rear in the front and rear direction, and the front and rear ends of the floor inclined portion And a frame mounting portion of the frame member includes a frame inclined portion that comes into contact with the floor inclined portion and a frame standing portion that comes into contact with the floor upright portion, and an outer portion of the floor inclined portion. A bolt that penetrates a metal plate disposed between the skin and the inner skin is screwed into a female thread portion provided on the inclined portion of the frame, and penetrates a metal plate disposed on the inner surface in the front-rear direction of the inner skin of the floor standing portion. Is threaded into the female thread provided on the frame upright, so that the outer skin and inner skin of the floor slope By joining the metal collar and reinforcing the joint flange of the inner skin and outer skin of the floor upright part to the metal plate, when the collision load is input to the floor panel, the collision load is applied to both the outer skin and the inner skin. It is possible to disperse and prevent the adhesive from being peeled off at the joining flange, thereby enhancing the impact energy absorbing effect on the floor panel.

In particular, according to the configuration of claim 2, the metal plate is formed in a letter shape and bonded across the floor standing portion and the floor inclined portion, and the metal plate is fitted into the fastening hole of the floor standing portion. The impact load input from the frame mounting part is transmitted not only to the outer skin of the floor standing part, but also to the inner skin of the floor standing part and the floor inclined part via the metal plate. Further, peeling of the bonded portion of the inner skin is prevented.

In particular, according to the third aspect of the present invention, the side frame in which the side sill, the front pillar lower, and the rear pillar are integrated is joined to both sides of the floor panel in the vehicle width direction, and the floor panel is sandwiched between the inner skin and the outer skin. Since the corrugated core has a corrugated core and the corrugated crests and valleys extend in the front-rear direction in the floor inclined part, the collision load input from the frame mounting part is passed through the floor inclined part reinforced by the core. It can be distributed to partial frames. In addition, the outer end in the vehicle width direction of the floor standing part constitutes a part of the wheel house, the frame mounting part includes a collar part that covers a part of the wheel house, and the metal plate is located on the inner side in the vehicle width direction of the collar part, Since the metal collar is located on the inner side of the metal plate in the vehicle width direction, the collision load input from the frame mounting part is transmitted from the heel part to the side frame through part of the wheel house of the floor upright part, and the metal plate and metal By dispersing the color through the floor panel, the impact energy absorption effect can be enhanced.

The perspective view of the vehicle body front part of a motor vehicle. FIG. 2 is a two-way exploded perspective view of FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG.

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

  As shown in FIG. 1 and FIG. 2, a vehicle body of an automobile basically composed of CFRP (carbon fiber reinforced resin) extends in the front-rear direction along the floor panel 11 and both side edges of the floor panel 11 in the vehicle width direction. A pair of left and right side sills 12, 12, a pair of left and right front pillars 13, 13 rising from the front ends of the left and right side sills 12, 12, and a left and right front pillar lowers 13, 13 rising from the front end of the floor panel 11. A dash panel lower 14 to be connected. A pair of left and right rear pillars (not shown) are erected from the rear ends of the left and right side sills 12, 12, and the front pillar lower 13, the side sills 12, and the rear pillar constitute a U-shaped side frame 15 in a side view. . Each of the above members is made of CFRP.

  The metal frame member 16 attached to the front end of the floor panel 11 includes a pair of left and right frame attachment portions 17 and 17 and a pair of left and right front side frames 18 and 18 extending forward from the front ends of the left and right frame attachment portions 17 and 17. A rectangular frame-shaped front bulkhead 19 that connects the front ends of the left and right front side frames 18 and 18, and a cross member 20 that connects the front ends of the left and right frame mounting portions 17 and 17 in the vehicle width direction. .

  As shown in FIGS. 2 and 3, the frame mounting portion 17 includes a vertical wall 17 a that extends in a flat plate shape in the front-rear direction and the vertical direction and opens at the center, and a large number of protrusions projecting from the vertical wall 17 a to both sides in the vehicle width direction And a flat frame upright portion 17c extending in the vertical direction at the rear end of the vertical wall 17a, and a flat frame inclined portion 17d from the lower end of the frame upright portion 17c to the rear lower side. Extend. The frame standing portion 17c is formed with two left and right female screw portions 17e and 17e, and the frame inclined portion 17d is formed with two left and right female screw portions 17f and 17f. Further, a flat plate-shaped flange portion 17g extends rearward and outward in the vehicle width direction from the outer end in the vehicle width direction of the frame standing portion 17c.

  The rectangular frame-shaped front sub-frame 21 includes a pair of left and right vertical members 22, 22 extending in the front-rear direction, and includes two bolts 23, 23 penetrating the front end and rear end of the vertical member 22 from below to above. The front sub-frame 21 is fixed to the lower surfaces of the left and right frame mounting portions 17 and 17 by screwing into female screw portions 17 h and 17 h formed at the front and rear ends of the lower surface of the frame mounting portion 17.

  As shown in FIGS. 1 to 3, the floor panel 11 is configured by bonding a lower outer skin 24 and an upper inner skin 25 with joint flanges 24 a and 25 a on the outer periphery thereof. A floor flat portion 11b having a floor tunnel 11a extending in the front-rear direction at the center in the width direction, a floor inclined portion 11c rising obliquely forward and upward from the front end of the floor flat portion, and upward from the front end of the floor inclined portion 11c And a floor upright portion 11 d that rises and is connected to the lower end of the dash panel lower 14.

  The floor flat portion 11b has a sandwich structure in which a corrugated core 26 is sandwiched between an outer skin 24 and an inner skin 25, and the core 26 is disposed such that peaks and troughs of the corrugated sheet are directed in the vehicle width direction. . The floor inclined portion 11c also has a sandwich structure in which the corrugated core 27 is sandwiched between the outer skin 24 and the inner skin 25, but the interval between the outer skin 24 and the inner skin 25 is larger than the floor flat portion 11b and the core 27. Are arranged so that the peaks and valleys of the corrugated plate are directed in the front-rear direction. The floor standing part 11d is constituted by the joining flanges 34a and 25a of the outer skin 24 and the inner skin 25 joined by bonding, and has a solid structure without a core.

  As shown in FIGS. 3 and 4, a metal collar 28 having a shape in which two cylinders are combined is embedded in the floor inclined portion 11 c of the floor panel 11 by bonding. The corrugated core 27 of the floor inclined portion 11 c includes a metal collar holding portion 27 a having an eight-shaped cross section into which the metal collar 28 is fitted. The metal color holding portion 27 a extends over the peaks and valleys of the core 27. Connected as if Cylindrical protrusions 28a and 28a protruding from the lower surface of the metal collar 28 are fitted into fastening holes 24b and 24b formed in the outer skin 24, and cylindrical protrusions 28b and 28b protruding from the upper surface of the metal collar 28 are inner skins. 25 is fitted into the fastening holes 25b, 25b.

  Returning to FIG. 1 to FIG. 3, the two bolts 29, 29 penetrating the metal collar 28 from the top to the bottom are screwed into the female screw portions 17 f, 17 f of the frame inclined portion 17 d of the frame mounting portion 17. The upper surface of the portion 17d is fastened to the lower surface of the floor inclined portion 11c. At this time, the heads of the bolts 29 and 29 are in direct contact with the protrusions 28 b and 28 b on the upper surface of the metal collar 28, and the floor inclined portion 11 c of the frame mounting portion 17 is in direct contact with the protrusions 28 a and 28 a on the lower surface of the metal collar 28. Therefore, the outer skin 24 and the inner skin 25 are prevented from being damaged by the fastening load of the bolts 29 and 29.

  A metal plate 30 made of a plate material that is bent into a cross section is fixed by adhesion so as to straddle the rear surface of the inner skin 25 of the floor standing portion 11d and the upper portion of the rear surface of the inner skin 25 of the floor inclined portion 11c. A triangular reinforcing rib 30a extending in the vertical direction is formed on the rear surface of the metal plate 30, and two cylindrical collar portions 30b and 30b on the left and right are projected from the front surface of the metal plate 30. The collar portions 30b and 30b are fitted into fastening holes 11e and 11e penetrating the floor standing portion 11d and are in contact with the rear surface of the frame standing portion 17c of the frame mounting portion 17.

Then, the two bolts 31, 31 penetrating the metal plate 30 from the rear to the front are screwed into the female screw portions 17 e, 17 e of the frame rising portion 17 c of the frame mounting portion 17, so that the rear surface of the frame rising portion 17 c is raised on the floor. Fastened to the front surface of the portion 11d. At this time, the heads of the bolts 31 and 31 are in direct contact with the rear surface of the metal plate 30 and the frame standing portion 17c is in direct contact with the collar portions 30b and 30b of the metal plate 30, so that the outer skin 24 and the inner skin 25 are As shown in FIG. 2, the front wheel house 32 is formed so as to extend from the front pillar lower 13 to the dash panel lower 14. The floor standing part 11 d of the floor panel 11 is integrally provided with a wheel house part 11 f that wraps around rearward and outward in the vehicle width direction, and the wheel house part 11 f constitutes a part of the wheel house 32. A flange portion 17g extending integrally from the frame mounting portion 17 that contacts the front surface of the floor standing portion 11d overlaps the wheel house portion 11f of the floor standing portion 11d.

  The positional relationship in the vehicle width direction of the flange portion 17g of the frame mounting portion 17, the metal collar 28 and the metal plate 30 is such that the metal plate 30 is positioned on the inner side in the vehicle width direction of the flange portion 17g of the frame mounting portion 17. It is located inside the metal plate 30 in the vehicle width direction.

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

  The frame member 16 screwed to the front end of the floor panel 11 made of CFRP includes a frame mounting portion 17 in which both side surfaces in the vehicle width direction of the vertical wall 17a extending in the vertical direction and the front-rear direction are reinforced by a plurality of ribs 17b. Fastening holes 11e, 11e, 24b, 24b, 25b, 25b formed in the floor panel 11 in the female screw portions 17e, 17e; 17f, 17f provided in the region reinforced by the plurality of ribs 17b. Since the bolts 29, 29; 31, 31 penetrating from the rear to the front are screwed together, it becomes possible to attach and detach the frame member 16 by operating the bolts 29, 29; 31, 31 from the floor panel 11 side. A work space can be secured without being affected by the shape and dimensions of the frame member 16, and workability is improved. In addition, since the shape of the frame mounting portion 17 that requires strength can be determined without considering the movement space of the tool for operating the bolts 29, 29; 31, 31, the cross-sectional area of the frame mounting portion 17 is ensured to the maximum. Thus, the strength against the collision load can be increased.

  Further, the front end portion of the floor panel 11 formed by bonding the outer skin 24 and the inner skin 25 with the peripheral joining flanges 24a and 25a includes a floor inclined portion 11c inclined obliquely upward from the front end of the floor flat portion 11b, and a floor The frame mounting portion 17 of the frame member 16 includes a frame inclined portion 17d that comes into contact with the floor inclined portion 11c and a frame standing portion that comes into contact with the floor standing portion 11d. Bolts 29 and 29 that pass through the metal collar 28 disposed between the outer skin 24 and the inner skin 25 of the floor inclined portion 11c are screwed into female screw portions 17f and 17f provided on the frame inclined portion 17d. The metal pre-bonded to the rear surfaces of the floor standing part 11d and the floor inclined part 11c Since the bolts 31, 31 penetrating the groove 30 are screwed into the female screw portions 17e, 17e provided in the frame standing portion 17c, the outer skin 24 and the inner skin 25 of the floor inclined portion 11c are joined by the metal collar 28, By joining the inner skin 25 of the floor standing portion 11d and the floor inclined portion 11c with the metal plate 30, when the collision load is input to the floor panel 11, the collision load is distributed to both the outer skin 24 and the inner skin 25. Thus, peeling of the adhesive at the joining flanges 24a and 25a can be prevented, and the impact energy absorbing effect of the floor panel 11 can be enhanced.

  In particular, the metal plate 30 that is formed in a square shape and is bonded across the floor standing portion 11d and the floor inclined portion 11c has collar portions 30b and 30b that fit into the fastening holes 11e and 11e and a reinforcing rib 30a. Therefore, the collision load input from the frame mounting portion 17 is transmitted not only to the outer skin 24 of the floor standing portion 11d but also to the inner skin 25 of the floor standing portion 11d and the floor inclined portion 11c via the metal plate 30. Further, peeling of the bonded portions at the joining flanges 24a and 25a of the outer skin 24 and the inner skin 25 is prevented.

  A side frame 15 (see FIG. 1) in which the side sill 12, the front pillar lower 13 and the rear pillar (not shown) are integrated is joined to both sides of the floor panel 11 in the vehicle width direction. Since corrugated cores 26 and 27 sandwiched between outer skins 24 are provided, and the direction in which the corrugated peaks and troughs of the core 27 of the floor inclined portion 11c extend is the front-rear direction, input from the frame mounting portion 17 The collision load can be distributed to the side frame 15 via the floor inclined portion 11 c reinforced by the core 27.

  Further, since the metal collar 28 is disposed so as to cross the peaks and valleys of the corrugated plate of the core 27 of the floor inclined portion 11c (see FIG. 4), the collision load input from the frame mounting portion 17 is efficiently applied to the floor inclined portion 11c. Can be transmitted to the floor panel 11.

  Further, the outer end in the vehicle width direction of the floor standing portion 11d constitutes a wheel house portion 11f that is a part of the wheel house 32, and the frame mounting portion 17 includes a flange portion 17g that covers a portion of the wheel house portion 11f, and a metal plate 30 is located on the inner side in the vehicle width direction of the flange portion 17g, and the metal collar 28 is located on the inner side in the vehicle width direction of the metal plate 30, so that a collision load input from the frame mounting portion 17 is applied to the floor standing portion 11d from the flange portion 17g. While transmitting to the side frame 15 through the wheel house part 11f, and disperse | distributing to the floor panel 11 through the metal plate 30 and the metal collar 28, the absorption effect of a collision energy can be heightened.

  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 frame member 16 provided at the front portion of the vehicle body has been described, but the present invention can also be applied to a frame member provided at the rear portion of the vehicle body. When the frame member is provided in the front part of the vehicle body, the front side corresponds to the outside in the front-rear direction and the rear side corresponds to the inside in the front-rear direction, but when the frame member is provided in the rear part of the vehicle body, the rear side is outward in the front-rear direction Correspondingly, the front side corresponds to the inner side in the front-rear direction.

  The FRP of the present invention is not limited to the CFRP of the embodiment, and may be another type of FRP such as GFRP (glass fiber reinforced resin).

11 Floor panel 11c Floor inclined part 11d Floor standing part 11e Fastening hole 12 Side sill 13 Front pillar lower 15 Side frame 16 Frame member 17 Frame mounting part 17a Vertical wall 17b Rib 17c Frame standing part 17d Frame inclined part 17e Female thread part 17f Female thread part 17g Isobe
17h female thread
21 front subframe
23 bolt 24 outer skin 24a joint flange 24b fastening hole 25 inner skin 25a joint flange 25b fastening hole 26 core 27 core 28 metal collar 29 bolt 30 metal plate 30a reinforcing rib 30b collar 31 bolt 32 wheel house

Claims (3)

A vehicle body structure for an automobile in which a metal frame member (16) is screwed to the front and rear ends of a floor panel (11) made of FRP,
The frame member (16) includes a frame attachment portion (17) in which both side surfaces in the vehicle width direction of the vertical wall (17a) extending in the vertical direction and the front-rear direction are reinforced with a plurality of ribs (17b). The fastening holes (11e, 24b, 17b) formed in the front and rear direction end portions of the floor panel (11) are formed in the female screw portions (17e, 17f) provided in the region reinforced by the plurality of ribs (17b). 25b), the bolts (29, 31) penetrating from the inner side to the outer side in the front-rear direction are screwed together , whereby the frame mounting portion (17) is fixed to the floor panel (11) and the frame mounting portion (17 The front sub-frame (21) is fixed to the lower surface of the frame mounting portion (17) by screwing the bolt (23) into the female screw portion (17h) formed at the front end and rear end of the lower surface of the frame). Body structure of a motor vehicle, characterized in that it is. A vehicle body structure for an automobile in which a metal frame member (16) is screwed to the front and rear ends of a floor panel (11) made of FRP,
The frame member (16) includes a frame attachment portion (17) in which both side surfaces in the vehicle width direction of the vertical wall (17a) extending in the vertical direction and the front-rear direction are reinforced with a plurality of ribs (17b). The fastening holes (11e, 24b, 17b) formed in the front and rear direction end portions of the floor panel (11) are formed in the female screw portions (17e, 17f) provided in the region reinforced by the plurality of ribs (17b). bolts passing through the outward 25b) from the front-rear direction inner side (29, 31) is screwed,
The front-rear direction end of the floor panel (11) formed by bonding the outer skin (24) and the inner skin (25) with the peripheral joining flanges (24a, 25a) is obliquely upward toward the front-rear direction outer side. An inclined floor inclined part (11c) and a floor standing part (11d) rising upward from an outer end in the front-rear direction of the floor inclined part (11c), and a frame attaching part (17) of the frame member (16) Comprises a frame inclined portion (17d) that contacts the floor inclined portion (11c) and a frame raised portion (17c) that contacts the floor upright portion (11d), and the outer portion of the floor inclined portion (11c). The bolt (29) passing through the metal collar (28) disposed between the skin (24) and the inner skin (25) is connected to the frame inclined portion (17d). The bolt (31) that is threadedly engaged with the female thread portion (17f) provided on the floor and penetrates the metal plate (30) disposed on the inner surface (25) in the front-rear direction of the inner skin (25) of the floor upright portion (11d) Is screwed into the female thread portion (17e) provided on the frame standing portion (17c),
The metal plate (30) is formed in a square shape and bonded across the floor upright portion (11d) and the floor inclined portion (11c), and the metal plate (30) is attached to the floor upright portion ( 11. A vehicle body structure having a collar portion (30b) and a reinforcing rib (30a) fitted into a fastening hole (11e) of 11d) . A vehicle body structure for an automobile in which a metal frame member (16) is screwed to the front and rear ends of a floor panel (11) made of FRP,
The frame member (16) includes a frame attachment portion (17) in which both side surfaces in the vehicle width direction of the vertical wall (17a) extending in the vertical direction and the front-rear direction are reinforced with a plurality of ribs (17b). The fastening holes (11e, 24b, 17b) formed in the front and rear direction end portions of the floor panel (11) are formed in the female screw portions (17e, 17f) provided in the region reinforced by the plurality of ribs (17b). bolts passing through the outward 25b) from the front-rear direction inner side (29, 31) is screwed,
The front-rear direction end of the floor panel (11) formed by bonding the outer skin (24) and the inner skin (25) with the peripheral joining flanges (24a, 25a) is obliquely upward toward the front-rear direction outer side. An inclined floor inclined part (11c) and a floor standing part (11d) rising upward from an outer end in the front-rear direction of the floor inclined part (11c), and a frame attaching part (17) of the frame member (16) Comprises a frame inclined portion (17d) that contacts the floor inclined portion (11c) and a frame raised portion (17c) that contacts the floor upright portion (11d), and the outer portion of the floor inclined portion (11c). The bolt (29) passing through the metal collar (28) disposed between the skin (24) and the inner skin (25) is connected to the frame inclined portion (17d). The bolt (31) that is threadedly engaged with the female thread portion (17f) provided on the floor and penetrates the metal plate (30) disposed on the inner surface (25) in the front-rear direction of the inner skin (25) of the floor upright portion (11d) Is screwed into the female thread portion (17e) provided on the frame standing portion (17c),
A side frame (15) in which a side sill (12), a front pillar lower (13), and a rear pillar are integrated is joined to both sides of the floor panel (11) in the vehicle width direction, and the floor panel (11) is connected to the inner skin. (25) and a corrugated core (26, 27) sandwiched between the outer skin (24), and the corrugated peaks and troughs of the core (27) extend in the floor inclined portion (11c). The direction is the front-rear direction, the outer end in the vehicle width direction of the floor standing part (11d) constitutes a part of the wheel house (32), and the frame attachment part (17) is a part of the wheel house (32). The metal plate (30) is positioned on the inner side in the vehicle width direction of the flange (17g), and the metal collar (28) is the vehicle width of the metal plate (30). Body structure of a motor vehicle, characterized in that located in the direction inward.

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