JP6112672B2 - Auto body structure - Google Patents

Description

  The present invention integrates a side sill joined to the upper surface of the vehicle width direction outer end portion of the vehicle body floor, a front pillar lower standing from the front end of the side sill, and a rear pillar standing from the rear end of the side sill with a CFRP laminated plate. The present invention relates to a vehicle body structure.

  A lower body structure integrally including an A pillar, a side sill (rocker), a B pillar and a rear side member, an FRP outer wall member, a hollow FRP inner rib structure disposed therein, an outer wall member and an inner Patent Document 1 listed below discloses a structure that is composed of a foam core filled in a space sandwiched between rib structures to increase the strength and rigidity of the lower body structure.

JP 2008-30609 A

  By the way, what was described in the above-mentioned patent document 1 is that the lower body structure has a double structure of the outer wall member and the inner rib structure, so that not only the structure becomes complicated and the weight increases, but also the outer wall member and the inner rib. There is a problem that productivity is lowered because it is necessary to fill the space between the structures with the foam core.

  The present invention has been made in view of the above circumstances, and an object thereof is to increase the strength and rigidity of the side skeleton of a CFRP vehicle body with a highly productive and lightweight structure.

To achieve the above object, according to the invention described in claim 1, a side sill joined to the upper surface of the vehicle width direction outer end of the vehicle body floor, a front pillar lower standing from the front end of the side sill, A vehicle body structure of an automobile in which a rear pillar standing up from a rear end of the side sill is integrally formed of a CFRP laminated plate, wherein a cross section of the side sill has a U-shaped outer wall that opens inward in the vehicle width direction, An upper wall extending inward in the vehicle width direction from the upper end of the outer side wall, a lower wall extending inward in the vehicle width direction from the lower end of the outer wall, and a vehicle on the lower wall extending downward from the inner end in the vehicle width direction of the upper wall And a corner portion where the outer wall and the lower wall are joined to each other so that the corner portion where the outer wall and the upper wall are joined is thick. Will be thick Mutually overlap, the vehicle body floor is provided with a protrusion protruding outward in the vehicle width direction than the side sill, the proposed vehicle body structure, characterized in that a energy absorbing member in at least the projecting portion is to that.

According to the invention described in claim 2 , in addition to the structure of claim 1, the vehicle body floor includes a core sandwiched between an under floor panel made of a CFRP laminate and an upper floor panel made of a CFRP laminate. A vehicle body comprising a load distribution frame between the energy absorbing member and the core, wherein a thickness of a portion storing the energy absorbing member is larger than a thickness of a portion storing the core A structure is proposed .

According to the invention described in claim 3 , in addition to the structure of claim 1 , the vehicle body floor and the side sill are moved up and down by a metal center pillar support bracket that fits into the recess formed by cutting out the protrusion. A vehicle body structure for an automobile is proposed in which the lower end of the center pillar is supported by the center pillar support bracket.

Further, according to the invention described in claim 4 , the side skeleton central portion constituting the side sill, the side skeleton front portion standing from the front end of the side sill via the bent portion and constituting the front pillar lower, A side skeleton rear portion that stands up from the rear end of the side sill and forms a rear pillar is integrally formed with a CFRP laminated plate, and a lateral cross section of the side skeleton front portion and the side skeleton rear portion is: A U-shaped outer wall that opens inward in the vehicle width direction, an upper wall that extends inward in the vehicle width direction from the upper end of the outer wall, a lower wall that extends inward in the vehicle width direction from the lower end of the outer wall, and the upper wall An inner wall extending downward from the inner end in the vehicle width direction of the lower wall and joined to the inner end of the lower wall in the vehicle width direction, and the corner portions where the outer wall and the upper wall are joined are thickened to each other. Overlap, the outer wall and the lower wall are joined That the corner portion mutually overlapping so that the thick, said lateral skeleton central portion, an outer wall, top wall and bottom wall are integrally formed in CFRP laminates one, the lateral skeleton before A vehicle body structure for an automobile is proposed in which the outer surface and the rear part of the side skeleton are overlapped and joined so as to be flat .

Further, according to the invention described in claim 5 , the side skeleton central portion constituting the side sill, the side skeleton front portion constituting the front pillar lower standing from the front end of the side sill via the bent portion, A side skeleton rear portion that stands up from the rear end of the side sill and forms a rear pillar is integrally formed with a CFRP laminated plate, and a lateral cross section of the side skeleton front portion and the side skeleton rear portion is: A U-shaped outer wall that opens inward in the vehicle width direction, an upper wall that extends inward in the vehicle width direction from the upper end of the outer wall, a lower wall that extends inward in the vehicle width direction from the lower end of the outer wall, and the upper wall An inner wall extending downward from the inner end in the vehicle width direction of the lower wall and joined to the inner end of the lower wall in the vehicle width direction, and the corner portions where the outer wall and the upper wall are joined are thickened to each other. Overlap, the outer wall and the lower wall are joined That the corner portion mutually overlap so that the thick, joined the partition plate on the side skeleton front portion of the inner surface, provided with a door hinge mounting portion to the side framework front in the vicinity of the partition plate A vehicle body structure characterized by this is proposed.

  According to the configuration of claim 1, the side sill joined to the upper surface of the vehicle width direction outer end of the vehicle body floor, the front pillar lower standing from the front end of the side sill, and the rear pillar standing from the rear end of the side sill are CFRP laminated. It is composed of a single board. The cross-section of the side sill includes a U-shaped outer wall that opens inward in the vehicle width direction, an upper wall that extends inward in the vehicle width direction from the upper end of the outer wall, and a lower wall that extends inward in the vehicle width direction from the lower end of the outer wall And an inner wall extending downward from the inner end in the vehicle width direction of the upper wall and joined to the inner end in the vehicle width direction of the lower wall.

  The corners where the outer and upper walls join are overlapped so that they are thick, and the corners where the outer and lower walls join are overlapped so that they are thick. The outer wall, which has a cross-section and has high strength, has thicker upper and lower corners to further increase the strength, thereby increasing the bending rigidity of the bent portion where the front pillar lower or rear pillar continues to the side sill. Not only can the portions of the outer wall, upper wall, lower wall, and inner wall that do not overlap be thinned to reduce weight. Moreover, since the outer wall of the side sill is divided into an outer wall, an upper wall, a lower wall, and an inner wall, all of these four members can be basically made of flat members to enhance the formability of the CFRP laminate. In addition, it is possible to increase the strength by reducing the bent portion where the stress is concentrated.

In addition, since the vehicle body floor has a protruding portion that protrudes outward in the vehicle width direction from the side sill, and an energy absorbing member is disposed at least in the protruding portion, the collision load of the side collision is input to the protruding portion of the vehicle body floor before the side sill. By absorbing a part of the collision energy by the crushing of the energy absorbing member disposed in the protruding portion of the vehicle body floor, the side sill can be prevented from falling inward in the vehicle width direction.

According to the second aspect of the present invention, the vehicle body floor includes a core sandwiched between an under floor panel made of a CFRP laminated plate and an upper floor panel made of a CFRP laminated plate, and the thickness of the portion that houses the energy absorbing member is Since the load distribution frame is provided between the energy absorbing member and the core, the thickness of the energy absorbing member is increased to increase the thickness of the energy absorbing member against the impact load of the side collision input to the side sill. While improving the absorption performance, the thickness of the vehicle body floor can be reduced to reduce the weight .

According to the third aspect of the present invention, the vehicle body floor and the side sill are sandwiched from above and below by the metal center pillar support bracket that fits into the recess with the protruding portion cut out, and the center pillar support bracket supports the lower end of the center pillar. Therefore, the center pillar support bracket can be firmly supported by the side sill while preventing the center pillar support bracket from projecting outward from the vehicle body floor and the side sill in the vehicle width direction and maintaining the design of the vehicle body.

Further, according to the configuration of claim 4 or claim 5 , the side skeleton central portion constituting the side sill, the side skeleton front portion standing from the front end of the side sill via the bent portion and constituting the front pillar lower, A side skeleton rear portion constituting a rear pillar standing from a rear end of the side sill via a bent portion is integrally formed of a CFRP laminate. The lateral cross section of the front part of the side skeleton and the rear part of the side skeleton includes a U-shaped outer wall that opens inward in the vehicle width direction, an upper wall that extends inward in the vehicle width direction from the upper end of the outer wall, and a lower end of the outer wall. A lower wall extending inward in the vehicle width direction, and an inner wall extending downward from the inner end in the vehicle width direction of the upper wall and joined to the inner end in the vehicle width direction of the lower wall.

  The corners where the outer and upper walls join are overlapped so that they are thick, and the corners where the outer and lower walls join are overlapped so that they are thick. Since the outer wall has high cross-section and has high strength, the upper and lower corners become thicker and the strength is further increased, so that the lateral skeleton front part and the lateral skeleton rear part continue to the central part of the lateral skeleton. Not only can the bending rigidity of the bent portion be increased, but also the portions of the outer wall, the upper wall, the lower wall, and the inner wall that do not overlap can be reduced in thickness. In addition, the outer frame of the front side frame and the rear side frame are divided into an outer wall, an upper wall, a lower wall, and an inner wall, so that all of these four members are basically flat members to form a CFRP laminate. In addition to improving the shapeability of the resin, it is possible to increase the strength by reducing the bent portions where stress is concentrated.

In particular, according to the configuration of the fourth aspect, the lateral skeleton center portion is integrally formed of one CFRP laminated plate on the outer wall, the upper wall, and the lower wall, so that the weight can be reduced and the productivity can be improved. Moreover, the lateral skeleton central part is overlapped and joined to the front part of the lateral skeleton and the rear part of the lateral skeleton so that the outer surface becomes flat, so that the appearance can be enhanced by eliminating the step on the outer surface.

In particular, according to the fifth aspect of the present invention, the partition plate is joined to the inner surface of the side skeleton front portion, and the door hinge attachment portion is provided on the side skeleton front portion in the vicinity of the partition plate. The portion is reinforced to increase the strength of the door hinge mounting portion.

The perspective view seen from the diagonal front of the body frame of a car. (First embodiment) The perspective view seen from the slanting back of the body frame of a car. (First embodiment) FIG. 3 is a three-direction arrow view of FIG. 1. (First embodiment) 4A direction view and 4B direction arrow view of FIG. (First embodiment) FIG. 5 is a sectional view taken along line 5-5 of FIG. (First embodiment) FIG. 6 is an enlarged view of 6 parts in FIG. 5. (First embodiment) FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. (First embodiment) The perspective view and exploded perspective view of a side skeleton. (Second Embodiment) 9A-9A-9E-9E sectional view taken on the line of FIG. (Second Embodiment) The 10A part and 10B part enlarged view of FIG. (Second Embodiment)

First embodiment

  Hereinafter, a first embodiment 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 FIGS. 1 to 4, an automobile body frame mainly made of CFRP (carbon fiber reinforced resin) includes a body floor 11 and a pair of left and right sides extending in the front-rear direction along the left and right sides of the body floor 11. Side sills 12, 12; a pair of left and right front pillars 13 and 13 standing up front from the front ends of the left and right side sills 12, 12, and a pair of left and right rear pillars rising up from the rear ends of the left and right side sills 12, 12. 14, 14 and a pair of left and right center pillars 15 and 15 rising upward from the middle part in the front-rear direction of the left and right side sills 12 and 12, and the left and right center pillars 15 and 15 from the upper ends of the left and right front pillar lowers 13 and 13. A pair of left and right upper members 16, 16 extending to the upper ends of the left and right rear pillars 14, 14 via the upper ends are provided. The upper half of the upper member 16 constitutes the front pillar upper 16a, and the rear half constitutes the roof side rail 16b. The upper ends of the left and right center pillars 15 and 15 are joined by the roof arch 24.

  A flat dash panel lower 17 is joined to the front end of the vehicle body floor 11 and the front surfaces of the left and right front pillar lowers 13, 13, and a flat plate rear portion is connected to the rear end of the vehicle body floor 11 and the rear surfaces of the left and right rear pillars 14, 14. The partition wall 18 is joined, and the rear pershell 19 extends horizontally from the rear end of the rear partition wall 18. A pair of left and right aluminum alloy mounting bases 20, 20 are fixed to the front end of the vehicle body floor 11, and the rear ends of a pair of left and right aluminum alloy front side frames 21, 21 are fixed to the front ends of the mounting bases 20, 20. .

  A pair of left and right rear side frames 22, 22 extend rearward from the rear end of the lower wall of the vehicle body floor 11, and the rear pillars 14, 14 and the rear side frames 22, 22 are joined by a pair of left and right rear wheel house inners 23, 23. . The rear end of the upper wall of the vehicle body floor 11 ends at the position of the rear partition wall 18, and a rear floor 44, which is a member different from the upper wall of the vehicle body floor 11, is disposed behind the rear partition wall 18. Rear side frames 22, 22 having a closed cross section are constituted by the lower wall of the vehicle body floor 11 extending rearward and the rear floor 44. A luggage compartment 45 is defined above the rear floor 44.

  As shown in FIGS. 5 and 6, the vehicle body floor 11 is composed of an inverted U-shaped floor tunnel portion 11 a extending in the front-rear direction at the center in the vehicle width direction, and a pair of left and right when it is continuous on both sides of the floor tunnel portion 11 a in the vehicle width direction. Floor portions 11b and 11b. The under floor panel 25 includes a tunnel portion upper wall 25a, a pair of left and right tunnel portion side walls 25b and 25b extending downward from the outer end in the vehicle width direction of the tunnel portion upper wall 25a, and a vehicle width from the lower end of the tunnel portion side walls 25b and 25b. Floor portion lower walls 25c, 25c extending outward in the direction, and the floor portion upper walls 26a, 26a of the pair of left and right upper floor panels 26, 26 are formed to be substantially flat along the upper surfaces of the floor portion lower walls 25c, 25c. The

  At the outer end of the vehicle body floor 11 in the vehicle width direction, a joint flange 25d that is bent upward in the vehicle width direction of the floor lower wall 25c of the under floor panel 25, and the vehicle width of the floor upper wall 26a of the upper floor panel 26. A joining flange 26b whose outer end in the direction is bent upward is overlapped and joined. The vehicle width direction outer end portion of the vehicle body floor 11 is thicker in the vertical direction than the vehicle width direction central portion, and a pair of upper and lower energy absorbing members 30 and 30 are disposed in the thickened portion. The energy absorbing members 30 and 30 are made of a corrugated member made of PA (polyamide) or nylon excellent in shock absorbing performance.

  A support wall 31 is fixed to the inside of the energy absorbing members 30 and 30 in the vehicle width direction by adhesion, and the energy absorbing members 30 and 30 are fitted into fitting grooves 31a formed on the outer surface of the support wall 31 in the vehicle width direction. Are joined by bonding. The upper surfaces of the energy absorbing members 30 and 30 are bonded to the lower surface of the upper floor panel 26 by bonding, and the lower surfaces of the energy absorbing members 30 and 30 are bonded to the upper surface of the under floor panel 25 by bonding.

  A load distribution frame 32 made of CFRP (or made of aluminum) extending in the front-rear direction is disposed on the inner side of the support wall 31 in the vehicle width direction and where the thickness of the floor portion 11b changes. The upper surface and the lower surface of the load distribution frame 32 are bonded to the lower surface of the upper floor panel 26 and the upper surface of the under floor panel 25, respectively, and the outer surface in the vehicle width direction is bonded to the inner surface in the vehicle width direction of the support wall 31. A corrugated core 33 is disposed in the floor portion 11b on the inner side in the vehicle width direction of the load distribution frame 32, and the upper surface and the lower surface thereof are bonded to the lower surface of the upper floor panel 26 and the upper surface of the under floor panel 25, respectively. The

  The side sill 12 has an outer wall 46 that opens in a U shape toward the inner side in the vehicle width direction, an upper wall 47 that extends inward in the vehicle width direction from the upper end of the outer wall 46, and an inner side in the vehicle width direction from the lower end of the outer wall 46. The lower wall 48 extends and the inner wall 49 extends downward from the inner end of the upper wall 47 in the vehicle width direction and is joined to the inner end of the lower wall 48 in the vehicle width direction. A plurality of partition plates 36 are arranged at predetermined intervals in the front-rear direction.

  The outer side wall 46, the upper wall 47, the lower wall 48, and the inner side wall 49 are obtained by laminating UD prepregs of carbon fibers in 12 layers and curing them in a predetermined shape. Carbon of 12 layers of UD prepregs The orientation direction of the continuous fiber is repeated twice: + 60 °, −60 °, 0 °, 0 °, −60 °, + 60 ° when the front-rear direction is 0 °. In this way, by orienting the carbon continuous fibers evenly in the three directions intersecting each other at 120 °, it is possible to give pseudo-isotropic property that makes the strength of the CFRP laminate substantially uniform in each direction. .

  A corner portion 50 where the upper end of the outer wall 46 and the outer end in the vehicle width direction of the upper wall 47 are joined, a corner portion 51 where the lower end of the outer wall 46 and the outer end of the lower wall 48 are joined in the vehicle width direction, and the upper wall 47 In the vehicle width direction inner end and the corner portion 52 where the upper end of the inner side wall 49 is joined, the 12 layers of CFRP laminated plates overlap each other over a length of 30 mm or more, and the thickness is increased at the overlap portion. It has doubled. Further, a joining flange 48a extending in the vehicle width direction of the lower wall 48 and a joining flange 49a obtained by bending the lower end of the inner wall 49 are joined to each other so that the side sill 12 has a closed cross section. Composed.

  The lower wall 48 of the side sill 12 is placed on the upper surface of the upper floor panel 26 and joined by bonding at the outer end in the vehicle width direction of the vehicle body floor 11, that is, at the upper part of the energy absorbing members 30, 30. 11 protrudes outwardly in the vehicle width direction by a distance α (see FIG. 6) from the outer end in the vehicle width direction of the side sill 12 and thus absorbs energy extending into the protrusion 11c. The outer end portions in the vehicle width direction of the members 30 and 30 protrude outward in the vehicle width direction by a distance α from the outer end in the vehicle width direction of the side sill 12. The upper and lower ends of the crank-shaped connecting member 37 made of CFRP plate material are bonded to the outer end in the vehicle width direction of the side sill 12 and the connecting flanges 26b and 25d of the upper floor panel 26 and the under floor panel 25, respectively. Is done.

  As shown in FIG. 1, FIG. 2 and FIG. 7, a concave portion 11j is formed in the middle portion in the front-rear direction of the protruding portion 11c of the vehicle body floor 11, and an aluminum alloy is formed in the concave portion 11j. A center pillar support bracket 53 made of an extruded material is fitted. The center pillar support bracket 53 is a U-shaped member that has a side wall 53a, an upper wall 53b, and a lower wall 53c and that opens to the inside in the vehicle width direction. The side wall 53a is formed on the outer wall 46 of the side sill 12 and the vehicle body floor 11. The upper wall 53b is in contact with the upper wall 47 of the side sill 12, and the lower wall 53c is in contact with the lower surface of the vehicle body floor 11, so that the side sill 12 and the vehicle body floor 11 are sandwiched from above and below. . In this state, the protrusion 53d protruding outward in the vehicle width direction from the side wall 53a is aligned with the protrusion 11c of the vehicle body floor 11 so as to be aligned in the front-rear direction. And the lower end of the center pillar 15 is joined to the upper surface of the upper wall 53b.

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

  The side sill 12 provided at the outer end in the vehicle width direction of the vehicle body floor 11 made of CFRP has a hollow closed section made up of an outer wall 46 made of a CFRP laminate, an upper wall 47, a lower wall 48, and an inner wall 49. And the corner part 50 which the upper wall 47 joins mutually overlaps so that it may become thick, and the corner part 51 which the outer side wall 46 and the lower wall 48 join mutually overlap so that it may become thick. (See FIG. 6). The outer wall 46 having high strength because it has a U-shaped cross section that opens inward in the vehicle width direction is thicker because the upper and lower corner portions 50 and 51 overlap the upper wall 47 and the lower wall 48, respectively. Since it becomes meat and further increases its strength, the outer wall 46, the upper wall 47, the lower wall 48, and the inner wall are increased while increasing the bending rigidity of the bent portion where the front pillar lower 13 and the rear pillar 14 are connected to the front and rear ends of the side sill 12. It is possible to reduce the weight by reducing the non-overlapping portion of 49.

  Further, since the outer wall of the side sill 12 is divided into an outer wall 46, an upper wall 47, a lower wall 48, and an inner wall 49, all of these four members are basically formed of flat members to form the CFRP laminate. In addition, the strength can be increased by reducing bent portions where stress is concentrated. In addition, the CFRP laminated plate constituting the side sill 12 is formed by laminating a plurality of UD prepregs in which the orientation directions of the carbon continuous fibers are uniformly different so as to be quasi-isotropic, and the CFRP at the corner portions 50, 51, 52. Since the laminated plate overlaps by 30 mm or more, the strength of the CFRP laminated plate itself and the strength of the corner portions 50, 51, 52 where the laminated plate overlaps are increased, and the strength of the side sill 12 against the collision load of the side collision is ensured. be able to.

  In addition, the vehicle body floor 11 includes a protruding portion 11c that protrudes outward in the vehicle width direction from the side sill 12, and the energy absorbing members 30 and 30 are disposed at least in the protruding portion 11c. Is input to the protruding portion 11 c of the vehicle body floor 11, and a part of the collision energy is absorbed by the crushing of the energy absorbing members 30, 30 arranged in the protruding portion 11 c of the vehicle body floor 11. Can be prevented from falling down.

  At this time, the vehicle body floor 11 on the inner side in the vehicle width direction from the side sill 12 is configured by sandwiching the core 33 between the under floor panel 25 made of CFRP laminate and the upper floor panel 26 made of CFRP laminate, and the vehicle body floor 11 Since the thickness of the portion for storing the energy absorbing members 30 and 30 is larger than the thickness of the portion for storing the core 33, and the load distributing frame 32 is provided between the energy absorbing members 30 and 30 and the core 33 (FIG. 6). See), the thickness of the vehicle body floor 11 on the inner side in the vehicle width direction is reduced while increasing the thickness of the energy absorbing members 30 and 30 to increase the energy absorption performance against the collision load of the side collision input to the side sill 12 To reduce the weight.

  Further, the vehicle body floor 11 and the side sill 12 are sandwiched from above and below by the upper wall 53b and the lower wall 53c of the metal center pillar support bracket 53 fitted into the recess 11j in which a part of the protruding portion 11c of the vehicle body floor 11 is cut out. Since the lower end of the center pillar 15 is supported on the upper surface of the center pillar support bracket 53, the center pillar support bracket 53 is prevented from projecting outward from the vehicle body floor 11 and the side sill 12 to maintain the vehicle design. However, the center pillar 15 can be firmly supported by the side sill 12.

  Further, since the upper end of the front pillar lower 13 and the upper end of the rear pillar 14 are connected by the upper member 16 in which the front pillar upper 16a and the roof side rail 16b are integrated, the strength around the door opening of the vehicle body can be increased.

  In addition, since the rear ends of the upper floor panels 26 and 26 of the vehicle body floor 11 are joined to the rear partition 18 installed between the left and right rear pillars 14 and 14, a cargo room 45 having a rear floor 44 is formed behind the rear partition 18. Compared with the case where the upper floor panels 26 and 26 and the rear floor 44 are formed of a single member (see FIG. 2), the bent portion of the CFRP laminate can be reduced to increase productivity.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment, the central part of the side skeleton made of the side sill 12, the front part of the side skeleton made of the front pillar lower 13, and the rear part of the side skeleton made of the rear pillar 14 are integrally configured with a CFRP laminate. It relates to the structure of the lateral skeleton.

  The central part of the side skeleton (side sill 12) has a substantially U-shaped cross-section of the first CFRP laminate S1 that integrally forms the outer wall 46, the upper wall 47, and the lower wall 48, and a substantially flat cross-section that constitutes the inner wall 49. The second CFRP laminate S1 is joined to form a closed cross section (see FIG. 9C).

  The side skeleton front part (front pillar lower 13) connected to the front end of the central part of the side skeleton via a bent part is an outer wall 46, an upper wall 47, a lower wall 48, and an inner wall, each having a substantially flat plate cross section. The third to sixth CFRP laminates S3 to S6 constituting 49 respectively are joined to form a closed cross section (see FIG. 9A). Similarly, the side skeleton rear part (rear pillar 14) connected to the rear end of the side skeleton central part via a bent part is an outer wall 46, an upper wall 47, a lower wall 48, and an inner side, each having a substantially flat cross section. The seventh to tenth CFRP laminates S7 to S10 constituting the walls 49 are joined to form a closed cross section (see FIG. 9E).

  At the part where the front end of the side skeleton center part is connected to the rear end of the side skeleton front part, the side skeleton center part is overlapped and bonded to the outside of the side skeleton front part. The rear end of the front part of the side skeleton is bent into a crank-shaped cross section so that no step is generated. Thereby, the outer surface of the connection part of a side frame center part and a side frame front part becomes flat, and the beauty | look is ensured (refer FIG. 10 (A)). Similarly, the connecting portion of the side skeleton central portion and the side skeleton rear portion is also configured to be flat (see FIG. 10B).

  Metal door hinge attachment portions 54 and 54 for attaching a door hinge (not shown) of the front door are fixed to the upper and lower portions of the front part of the side skeleton. Inside the front part of the side skeleton in the vicinity of the door hinge attaching portions 54, 54, partition plates 55, 55 are connected to the inner surfaces of the outer wall 46, the upper wall 47, the lower wall 48, and the inner wall 49. Thus, the mounting strength of the door hinge mounting portions 54, 54 is enhanced by the partition plates 55, 55.

  As described above, according to the present embodiment, at the front part of the side skeleton and the rear part of the side skeleton, the corner part 50 where the outer wall 46 and the upper wall 47 are joined overlap each other so as to be thick. Since the corner portions 51 where the outer wall 46 and the lower wall 48 are joined overlap each other so as to be thick, the outer wall 46 having a U-shaped cross section has a higher strength than the upper and lower corner portions 50. , 51 becomes thicker and the strength is further increased, so that it is possible not only to increase the bending rigidity of the bent portion in which the side skeleton front part and the side skeleton rear part are continuous with the center part of the side skeleton, 46, the upper wall 47, the lower wall 48, and the inner wall 49 that are not overlapped can be thinned to reduce the weight.

  In addition, the outer frame 46, the upper wall 47, the lower wall 48, and the inner wall 49 are divided into an outer wall 46, an upper wall 47, a lower wall 48, and an inner wall 49 so that all four members are basically flat members. Thus, not only can the shapeability of the CFRP laminate be improved, but also the strength can be increased by reducing the bent portions where stress is concentrated.

  On the other hand, since the outer side wall 46, the upper wall 47, the lower wall 48, and the inner side wall 49 are integrally formed of a single CFRP laminated plate, the side skeleton central portion can be reduced in weight and improved in productivity. .

  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, the number of laminated UD prepregs of the CFRP laminated plate constituting the side sill 12 and the orientation direction of the carbon continuous fiber are not limited to the embodiment.

11 vehicle floor 11c protruding portions 11j recess 12 side sill 13 lower front pillar 14 rear pillar 15 Center Pila -25 under floor panel 26 under the floor panel 30 energy absorbing member 32 the load distribution frame 33 core <br/> 46 outer wall 47 top wall 48 Lower wall 49 Inner wall 50 Corner portion 51 Corner portion 53 Center pillar support bracket 54 Door hinge mounting portion 55 Partition plate

Claims (5)

A side sill (12) joined to the upper surface of the vehicle width direction outer end portion of the vehicle body floor (11), a front pillar lower (13) rising from the front end of the side sill (12), and a rear end of the side sill (12) A vehicle body structure in which a rear pillar (14) standing up from a vehicle is integrally formed of a CFRP laminate,
The side cross section of the side sill (12) has a U-shaped outer wall (46) that opens inward in the vehicle width direction, and an upper wall (47) that extends inward in the vehicle width direction from the upper end of the outer wall (46). A lower wall (48) extending inward in the vehicle width direction from the lower end of the outer wall (46), and extending downward from an inner end in the vehicle width direction of the upper wall (47) and extending in the vehicle width direction of the lower wall (48) An inner wall (49) joined to the end, and the corner (50) joined to the outer wall (46) and the upper wall (47) overlap each other so as to be thick, and the outer wall (46) and the corner portion (51) where the lower wall (48) is joined overlap each other so as to be thick, and the vehicle body floor (11) is more outward in the vehicle width direction than the side sill (12). A protrusion (11c) that protrudes, and at least the protrusion (11c); Body structure of a motor vehicle, characterized in that a energy absorbing member (30) within. The vehicle body floor (11) includes a core (33) sandwiched between an under floor panel (25) made of a CFRP laminate and an upper floor panel (26) made of a CFRP laminate, and the energy absorbing member (30) is provided. A thickness of a portion to be accommodated is larger than a thickness of a portion to accommodate the core (33), and a load distribution frame (32) is provided between the energy absorbing member (30) and the core (33). The vehicle body structure according to claim 1 . The vehicle body floor (11) and the side sill (12) are sandwiched from above and below by a metal center pillar support bracket (53) that fits into a recess (11j) in which the protrusion (11c) is cut out, and the center pillar 2. The vehicle body structure according to claim 1 , wherein the lower end of the center pillar (15) is supported by the support bracket (53) . The side skeleton center part which comprises a side sill (12), the side skeleton front part which stands up through a bending part from the front end of the said side sill (12), and comprises a front pillar lower (13), The said side sill (12 And a side skeleton rear portion constituting the rear pillar (14) standing up from the rear end through a bent portion, and integrally formed with a CFRP laminate,
The lateral cross section of the front part of the side skeleton and the rear part of the side skeleton extend inward in the vehicle width direction from the U-shaped outer wall (46) that opens inward in the vehicle width direction and the upper end of the outer wall (46). An upper wall (47), a lower wall (48) extending inward in the vehicle width direction from a lower end of the outer wall (46), and a lower wall (48) extending downward from an inner end in the vehicle width direction of the upper wall (47) 48) and an inner wall (49) joined to the inner end in the vehicle width direction, and the corner portion (50) where the outer wall (46) and the upper wall (47) are joined to each other so as to be thick. The corners (51) are overlapped so that the outer wall (46) and the lower wall (48) are joined to each other so as to be thick, and the lateral skeleton central part is formed on the outer wall (46). ), The upper wall (47) and the lower wall (48) are integrally formed of a single CFRP laminate, Body structure of a motor vehicle, characterized in that the outer surface with respect to the lateral skeleton front and the lateral skeleton rear are joined by overlapping so that the flat. The side skeleton center part which comprises a side sill (12), the side skeleton front part which stands up through a bending part from the front end of the said side sill (12), and comprises a front pillar lower (13), The said side sill (12 And a side skeleton rear portion constituting the rear pillar (14) standing up from the rear end through a bent portion, and integrally formed with a CFRP laminate,
The lateral cross section of the front part of the side skeleton and the rear part of the side skeleton extend inward in the vehicle width direction from the U-shaped outer wall (46) that opens inward in the vehicle width direction and the upper end of the outer wall (46). An upper wall (47), a lower wall (48) extending inward in the vehicle width direction from a lower end of the outer wall (46), and a lower wall (48) extending downward from an inner end in the vehicle width direction of the upper wall (47) 48) and an inner wall (49) joined to the inner end in the vehicle width direction, and the corner portion (50) where the outer wall (46) and the upper wall (47) are joined to each other so as to be thick. The corner part (51) which overlaps and the said outer wall (46) and the said lower wall (48) join mutually overlaps so that it may become thick, and a partition board ( 55) and a door hinge mounting portion (on the front side of the side skeleton in the vicinity of the partition plate (55)). Body structure of a motor vehicle, characterized in that a 4).

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