JP2014091462A - Body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body structure of an automobile capable of efficiently absorbing collision load to be input from various directions, while keeping weight increase to the minimum.SOLUTION: Left and right front pillar lower parts 16, left and right side sill parts 15, left and right rear pillar parts 17 and a cross member 18 constitutes a lower framework 48 that is U-shaped in a plan view and made of CFRP. Left and right center pillars 30 erected from a central part in the longitudinal direction of the left and right side sill parts 15, a roof arch 31 connecting upper ends of the left and right center pillars 30 in a width direction of the vehicle, left and right longitudinal frames 32 and 33 connecting upper ends of the left and right front pillars lower parts 16, upper ends of the left and right center pillars 30 and upper ends of the left and right rear pillar parts 17 in a longitudinal direction constitutes an upper framework 49 of a hollow cross section that is H-shaped in a plan view and made of CFRP.

Description

  The present invention provides a vehicle body configured by combining a lower outer skin and an upper inner skin, a floor panel portion, a front wall portion standing up from a front end of the floor panel portion, and a rear panel of the floor panel portion. A rear wall portion rising from an end; left and right side sill portions rising from an outer end in the vehicle width direction of the floor panel portion; left and right front pillar lower portions connecting the front wall portion and the left and right side sill portions; Left and right rear pillar portions connecting the rear wall portion and the left and right side sill portions, and a cross member portion extending in the vehicle width direction along the upper end of the rear wall portion and connecting between the upper ends of the left and right rear pillar portions. It relates to the body structure of automobiles.

  Japanese Laid-Open Patent Publication No. 2004-228667 discloses a floor made of fiber reinforced resin for automobiles with a honeycomb sandwiched between upper and lower floor panels.

  Patent Document 2 below discloses that an automobile front side frame and a fiber reinforced resin dash front panel are connected by an energy absorbing member made of an aluminum alloy die-cast member.

  Patent Document 3 below discloses that the upper and lower portions of a light alloy suspension member of a front wheel of an automobile are fixed to a body frame made of fiber reinforced resin.

  In addition, an outer skin and an inner skin made of fiber reinforced resin are joined up and down to constitute an automobile floor module, and a metal suspension member is fastened to a core provided on the rear wall of the floor module. 4 is known.

Japanese Utility Model Publication No. 57-130772 JP 2010-155539 A EP0900716B1 JP 2012-140083 A

  By the way, although what was described in the said patent document 1 improved the rigidity of a floor with a honeycomb structure, it was not able to satisfy the collision performance as the whole vehicle body.

  In addition, in the above-mentioned Patent Document 2, it is necessary to increase the thickness of the dash front panel that supports the energy absorbing member in order to sufficiently support the collision load of the frontal collision, and increase the thickness. And there was a problem that caused weight increase.

  In addition, since the suspension member made of light alloy is not connected to the dash front panel, the one described in Patent Document 3 cannot transmit the impact load of the frontal collision from the suspension member to the dash front panel and absorb it. There was a problem.

  In addition, since the collision load of the rear collision input to the metal suspension member is transmitted to the floor module, it is necessary to increase the thickness of the floor module. There was a problem that caused the increase.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body structure capable of efficiently absorbing a collision load input from various directions while minimizing an increase in weight. .

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a vehicle body configured by combining a lower outer skin and an upper inner skin, comprising a floor panel portion and the floor panel portion. A front wall portion rising from a front end of the floor panel portion, a rear wall portion rising from a rear end of the floor panel portion, left and right side sill portions rising from an outer end in the vehicle width direction of the floor panel portion, the front wall portion and the Left and right front pillar lower portions connecting the left and right side sill portions, left and right rear pillar portions connecting the rear wall portion and the left and right side sill portions, and extending in the vehicle width direction along the upper ends of the rear wall portions, A vehicle body structure including a cross member portion that connects between upper ends of left and right rear pillar portions, the left and right front pillar lower portions, the left and right side sill portions, and the left and right rear sill portions. The pillar portion and the cross member portion constitute a U-shaped CFRP lower skeleton in plan view, the left and right center pillars standing from the center in the front-rear direction of the left and right side sill portions, and the left and right center pillars Roof arches connecting the upper ends in the vehicle width direction, upper and lower upper and lower frames connecting the upper ends of the left and right front pillar lower portions, the upper ends of the left and right center pillars, and the upper ends of the left and right rear pillar portions in the front and rear direction; A vehicle body structure for an automobile is proposed in which an upper skeleton of a hollow cross section made of CFRP having an H shape in plan view is formed.

  According to the invention described in claim 2, in addition to the structure of claim 1, there is provided a vehicle body structure for an automobile characterized in that the center pillar is connected to the side sill portion via a metal connecting member. Proposed.

  According to the third aspect of the invention, in addition to the configuration of the first or second aspect, the metal rear frame integrally formed with the damper housing of the rear wheel is inclined upward toward the rear. An automobile body structure characterized by being connected to the rear surface of the rear pillar portion is proposed.

  According to the invention described in claim 4, in addition to the configuration of claim 3, the first flange in which the lower portion of the outer edge of the rear frame in the vehicle width direction is bent forward, and the lower edge of the rear frame is moved forward. An automobile characterized in that a bent second flange is formed in an L-shape, and the first and second flanges are connected to corners of the outer skin in the vehicle width direction of the outer skin constituting the rear wall portion. A vehicle body structure is proposed.

  According to the invention described in claim 5, in addition to the configuration of claim 3 or claim 4, a pair of left and right hollow crash rails extending rearward from the rear surface of the rear frame is provided, and the front end of the crash rail is provided. A vehicle body structure is proposed which is fitted in a recess formed in the rear frame.

  According to the invention described in claim 6, in addition to the structure of any one of claims 3 to 5, the rear wall portion to which the rear frame is connected straddles the side sill portion. Thus, an automobile body structure is proposed in which an L-shaped connecting plate for connecting the outer skin constituting the rear wall portion and the inner skin constituting the side sill portion is disposed.

  According to the invention described in claim 7, in addition to the configuration of any one of claims 1 to 6, the inside of the side sill portion is partitioned into an upper space and a lower space by a partition plate, and the partition A vehicle body structure for an automobile is proposed in which the outer end of the plate in the vehicle width direction is sandwiched between the outer skin and the joint flange of the inner skin.

  According to the invention described in claim 8, in addition to the structure of any one of claims 1 to 7, the steering connected to the front ends of the upper front and rear frames on the upper portion of the front pillar lower portion. A vehicle body structure is proposed, which is provided with a hanger support bracket.

  The front pillar 32 and the roof side rail 33 of the embodiment correspond to the upper front and rear frames of the present invention.

  According to the configuration of claim 1, an automobile body configured by combining a lower outer skin and an upper inner skin includes a floor panel portion, a front wall portion rising from a front end of the floor panel portion, and a floor panel. A rear wall portion that rises from the rear end of the front portion, left and right side sill portions that stand from the outer end in the vehicle width direction of the floor panel portion, left and right front pillar lower portions that connect the front wall portion and the left and right side sill portions, and the rear The left and right rear pillar portions connecting the wall portion and the left and right side sill portions, and a cross member portion extending in the vehicle width direction along the upper end of the rear wall portion and connecting the upper ends of the left and right rear pillar portions. The left and right front pillar lower parts, the left and right side sill parts, the left and right rear pillar parts, and the cross member part constitute a U-shaped CFRP lower skeleton in plan view from the center in the front-rear direction of the left and right side sill parts. Left and right center pillars, a roof arch that connects the upper ends of the left and right center pillars in the vehicle width direction, the upper ends of the left and right front pillar lower parts, the upper ends of the left and right center pillars, and the upper ends of the left and right rear pillar parts The upper and lower upper and lower frames connected in the direction constitute the upper skeleton of the CFRP hollow section having an H shape in plan view, so that a high-strength and lightweight vehicle compartment can be formed between the lower skeleton and the upper skeleton. Moreover, the impact load of the frontal collision or the rearal collision is supported by the U-shaped lower skeleton and the upper front and rear frames of the upper skeleton, and the thickness of the floor panel can be reduced to reduce the weight. Can be supported by the side sill portion of the lower skeleton and the center pillar and roof arch of the upper skeleton, and the cross-sectional area of the side sill portion can be reduced to reduce the weight.

  According to the second aspect of the present invention, since the center pillar is connected to the side sill portion via the metal connecting member, when the collision load of the side collision is input to the side sill portion, the metal connecting member is made plastic by ductility. By deforming and absorbing the impact, it is possible to prevent the center pillar from falling to the passenger compartment side.

  According to the third aspect of the present invention, since the metal rear frame integrally formed with the damper housing for the rear wheel is connected to the rear surface of the rear pillar portion that is inclined upward toward the rear, the rear wheel is connected to the damper housing. The input front upward or upward load can be efficiently transmitted from the rear frame to the U-shaped lower skeleton in plan view.

  According to the configuration of claim 4, the first flange in which the lower part of the outer edge of the rear frame in the vehicle width direction is bent forward and the second flange in which the lower edge of the rear frame is bent forward are formed in an L shape. Since the first and second flanges are connected to the corners of the outer skin in the vehicle width direction of the outer skin that constitutes the rear wall part, the collision load of the rear collision is reliably transmitted from the rear frame to the side sill part via the rear wall part. can do.

  According to the fifth aspect of the present invention, a pair of left and right hollow crash rails extending rearward from the rear surface of the rear frame is provided, and the front end of the crash rail is fitted into a recess formed in the rear frame. Is input to the crash rail, the crash rail can be crushed in the front-rear direction without breaking at the connecting portion with the rear frame, and can absorb the collision energy.

  According to the configuration of claim 6, the L-shape connecting the outer skin constituting the rear wall portion and the inner skin constituting the side sill portion straddling the side sill portion from the rear wall portion to which the rear frame is connected. Since the connecting plate is arranged, the collision load of the rear collision can be transmitted from the rear frame to the side sill portion via the rear wall portion and the connecting plate.

  Further, according to the configuration of the seventh aspect, the inside of the side sill portion is partitioned into the upper space and the lower space by the partition plate, and the outer end in the vehicle width direction of the partition plate is sandwiched between the joining flanges of the outer skin and the inner skin. It is possible to increase the strength of the side sill portion with respect to the collision load of the side collision, the front collision and the rear collision while minimizing the increase in the above.

  According to the eighth aspect of the present invention, since the steering hanger support bracket connected to the front ends of the upper front and rear frames is provided at the upper part of the front pillar lower part, the front pillar lower part and the upper front and rear parts are utilized using the steering hanger support bracket. The bonding strength of the frame can be increased.

The perspective view of the vehicle body frame of a motor vehicle. FIG. 2 is a two-direction arrow view of FIG. 1. FIG. 3 is a three-direction arrow view of FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. FIG. FIG. 7 is a view in the direction of arrow 7 in FIG. FIG. FIG. FIG. 10 is a cross-sectional view taken along line 10A-10A to 10C-10C in FIG. The disassembled perspective view of a 1st core material, a reinforcement member, a connection board, a reinforcement board, and a partition plate.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the body frame of the automobile includes a floor 11 made of CFRP (carbon fiber reinforced resin). The floor 11 extends along the left and right edges of the floor panel portion 12, the front wall portion 13 rising from the front end of the floor panel portion 12, the rear wall portion 14 rising from the rear end of the floor panel portion 12, and the floor panel portion 12. A pair of left and right side sill portions 15, 15 extending in the front-rear direction, a pair of left and right front pillar lower portions 16, 16 extending from the front ends of the left and right side sill portions 15, 15 along the left and right edges of the front wall portion 13, A cross connecting the pair of left and right rear pillars 17 and 17 extending from the rear ends of the side sill parts 15 and 15 along the left and right side edges of the rear wall 14 and the upper ends of the left and right rear pillars 17 and 17 in the vehicle width direction. And a member portion 18.

  A pair of left and right damper housings 19, 19 made of aluminum alloy are fixed to the front surface of the front wall portion 13, and a pair of left and right front side frames 20, 20 are formed integrally with the damper housings 19, 19. A pair of left and right CFRP crash rails 21, 21 extend forward from the front ends of the front side frames 20, 20, and a CFRP rectangular frame shape is formed on the inner side in the vehicle width direction of the front ends of the left and right crash rails 21, 21. The front bulkhead 22 is supported. A pair of left and right CFRP shock absorbing members 23, 23 are connected to the vehicle width direction outer sides of the front end portions of the left and right crash rails 21, 21, and CFRP extends in the vehicle width direction between the front ends of the left and right shock absorbing members 23, 23. A made front bumper beam 24 is connected. A CFRP box-shaped shroud 25 that is opened back and forth is supported in a space surrounded by the left and right crash rails 21, 21, the front bulkhead 22, the left and right impact absorbing members 23 and 23, and the front bumper beam 24.

  A pair of left and right CFRP upper members 26, 26 extending forward from the upper ends of the left and right front pillar lower portions 16, 16 are connected to the outer surfaces in the vehicle width direction of the damper housings 19, 19 and forward from the front ends of the upper members 26, 26. The front ends of a pair of left and right CFRP lower members 27, 27 extending inward in the vehicle width direction are connected to the front bulkhead 22.

  The floor panel portion 12 of the floor 11 integrally includes a floor tunnel 28 that extends in the vehicle width direction center portion in the front-rear direction and connects the front wall portion 13 and the rear wall portion 14. Are connected by a cross member 29 made of CFRP extending in the vehicle width direction. A pair of left and right center pillars 30, 30 are erected from the front-rear direction intermediate portion of the left and right side sill portions 15, 15, and the upper ends of the left and right center pillars 30, 30 are connected by a roof arch 31 extending in the vehicle width direction. The The lower part of the center pillars 30, 30, that is, the parts connected to the side sill parts 15, 15 are constituted by aluminum alloy die-cast connecting members 47, 47.

  The left and right center pillars 30 and 30 and the roof arch 31 excluding the connecting members 47 and 47 are integrally formed of CFRP so as to form an inverted U shape when viewed from the front. The upper ends of the left and right front pillar lower portions 16, 16 and the upper ends of the left and right rear pillar portions 17, 17 are connected by front pillars 32, 32 and roof side rails 33, 33, which are integrally formed of CFRP and extend in the front-rear direction. . The roof side rails 33, 33 penetrate the connecting portions of the left and right center pillars 30, 30 and the roof arch 31 in the front-rear direction.

  The left and right front pillar lower portions 16 and 16, the left and right side sill portions 15 and 15, the left and right rear pillar portions 17 and 17 and the cross member portion 18 constitute a lower frame 48 made of CFRP having a U shape in plan view. The left and right center pillars 30 and 30, the roof arch 31, the left and right front pillars 32 and 32, and the left and right roof side rails 33 and 33 constitute an upper frame 49 made of CFRP that is H-shaped in plan view.

  A pair of left and right rear frames 34, 34 made of aluminum alloy are connected to the rear surface of the rear wall portion 14 of the floor 11. A pair of left and right CFRP crash rails 35, 35 extend rearward from the lower ends of the left and right rear frames 34, 34, and a CFRP rear bumper extends in the vehicle width direction between the rear ends of the left and right crash rails 35, 35. A beam 36 is connected. A pair of left and right CFRP connecting members 37, 37 are disposed between the upper ends of the left and right rear frames 34, 34 and the upper ends of the left and right rear pillar portions 17, 17. The CFRP rear end frames 38, 38 extend rearward and downward and are connected to the rear bumper beam 36.

  The lower ends of the left and right rear frames 34, 34 are connected by a CFRP cargo compartment front bottom wall 39 extending rearward from the rear end of the floor panel portion 12, and extend rearward from the cargo compartment front bottom wall 39. A CFRP cargo room rear bottom wall 40 is connected to the rear bumper beam 36. Also, a pair of left and right cargo compartment side walls 41, 41 that stand integrally from the left and right side edges of the cargo compartment rear bottom wall 40 are connected to the rear ends of the rear frames 34, 34 and the lower ends of the connecting members 37, 37.

  The floor 11 includes a lower outer skin 42 and an upper inner skin 43 which are connected to a front wall portion 13, left and right front pillar lower portions 16, 16, left and right side sill portions 15, 15, left and right rear pillar portions 17, 17 and a cross. It is constituted by joining flanges 42a and 43a extending along the member portion 18 (see FIGS. 2 and 10). Between the outer skin 42 and the inner skin 43 of the floor panel portion 12, core materials 44, 44 formed in a corrugated shape with CFRP are sandwiched, and between the outer skin 42 and the inner skin 43 of the rear wall portion 14. The first core material 45 formed in a corrugated shape with CFRP and extending in the vertical direction is sandwiched between the second core material 46 extending in the horizontal direction from the upper end of the first core material 45 and rising upward (FIG. 9). reference).

  As shown in FIGS. 4 and 10, the outer side of the side sill portion 15 is configured by joining an outer skin 42 and an inner skin 43 with joint flanges 42 a and 43 a, and the inside of the side sill portion 15 is composed of the outer skin 42 and the inner skin 43. An outer edge in the vehicle width direction is sandwiched between the joint flanges 42 a and 43 a of the skin 43, and a joint flange 51 a that is bent upward in the vehicle width direction is vertically partitioned by a partition plate 51 made of CFRP joined to the inner surface of the inner skin 43. It is done. In a space above the partition plate 51 of the side sill portion 15, a shock absorbing member 55 made of CFRP that is bent zigzag in a side view is disposed. The upper surface of the side sill portion 15 includes an inner upper wall 15b and an outer upper wall 15c formed with the step portion 15a interposed therebetween, and the upper end of the shock absorbing member 55 is on the lower surface of the inner upper wall 15b and the outer upper wall 15c of the side sill portion 15. The lower end of the shock absorbing member 55 is connected to the upper surface of the partition plate 51. A load transmitting member 56 formed in a pipe shape having a trapezoidal cross section with CFRP is sandwiched between the outer skin 42 and the inner skin 43 at a portion below the partition plate 51 of the side sill portion 15 and connected to the floor panel portion 12. Arranged to be.

  As shown in FIGS. 1 and 4, steering hanger support brackets 58, 58 are fixed to the rear surfaces of the left and right front pillar lower portions 16, 16, respectively, so that the left and right steering hanger support brackets 58, 58 are connected. The steering hanger 60 is fixed.

  Next, the structure of the rear part of the vehicle body will be described in detail with reference to FIGS.

  The rear frame 34 made of aluminum alloy includes a plate-like side wall 34a extending in the front-rear direction and the vertical direction, and a bottom wall 34b bent inward in the vehicle width direction from the lower end of the side wall 34a. A damper housing 34c that is recessed inward in the vehicle width direction is integrally formed at the center of the side wall 34a, and the upper end of a suspension damper 71 (see FIG. 6) that supports the rear wheel is connected to the upper wall of the damper housing 34c. Is done.

  Three concave portions 34d are formed at the front edge of the side wall portion 34a of the rear frame 34, and three bolts 72 inserted into the concave portions 34d from the rear to the front are rear surfaces of the rear wall portion 14. Are screwed into nuts 73 inserted in the inner surfaces of the corners at both ends in the vehicle width direction of the outer skin 42 (see FIG. 8). The rear frame 34 is formed in an L shape with a first flange 34e bent forward at the lower front edge of the side wall 34a and a second flange 34f bent forward at the front edge of the bottom wall 34b. Three bolts 74 inserted in the vicinity of the first and second flanges 34e and 34f from the rear to the front are corners at the lower portions of both ends in the vehicle width direction of the outer skin 42 constituting the rear surface of the rear wall portion 14. The nut 75 is inserted into the inner surface and screwed (see FIG. 8). Thereby, the rear frame 34 is firmly fixed to the rear surface of the rear wall portion 14.

  An upper wall portion 34g obtained by bending the upper edge of the side wall portion 34a of the rear frame 34 outward in the vehicle width direction is connected to the lower surface of the connecting member 37 (see FIG. 8). A plurality of inner ribs 34h that connect the upper wall of the damper housing 34c and the lower surface of the connecting member 37 are formed on the inner surface in the vehicle width direction of the rear frame 34 at different angles (see FIG. 7). A plurality of outer ribs 34i connecting the upper portion of the damper housing 34c and the lower surface of the upper wall portion 34g are formed at different angles on the outer surface in the vehicle width direction (see FIGS. 6 and 8). That is, the upper ends of the outer ribs 34i are connected to the lower surface of the connecting member 37 via the upper wall portion 34g.

  The bottom walls 34b, 34b of the left and right rear frames 34, 34 are formed in a box cross section, and the front ends of the crash rails 35, 35 are fitted into the recesses 34j, 34j opened at the rear ends from the rear (see FIG. 7). The cargo compartment front bottom wall 39 is obtained by sandwiching a core material 39c made of corrugated plates between a pair of upper and lower skins 39a, 39b, and both ends in the vehicle width direction are bottom wall portions 34b of the left and right rear frames 34, 34. , 34b are fixed by bolts 76, and the lower surfaces of the crash rails 35, 35 are connected to the upper surface of the cargo compartment rear bottom wall 40 (see FIG. 7).

  A metal reinforcing member 77 is disposed in the space formed between the vehicle width direction end of the first core material 45 and the vehicle width direction end of the second core material 46 (FIGS. 9 and 11). reference). The reinforcing member 77 includes a rear wall portion 77a inclined in the same direction as the rear pillar portion 17, and a pair of side wall portions 77b and 77c extending forward in parallel with each other from the front surface of the rear wall portion 77a, and the rear surface of the rear wall portion 77a. The lower surfaces of the side wall portions 77b and 77c are connected to the upper surface of the outer skin 42, and the front surfaces of the side wall portions 77b and 77c are connected to the rear surface of the first core member 45 extending in the vertical direction. The flat part 45a which is not a corrugated sheet is formed in the vehicle width direction edge part of the 1st core material 45, and the flat reinforcement board 78 is piled up on the front surface of the flat part 45a (refer FIG. 11). The rear end of the partition plate 51 that partitions the inside of the side sill portion 15 into an upper space and a lower space is connected to the front surface of the reinforcing plate 78 (see FIGS. 10 and 11).

  The upper surface of the pair of side wall portions 77b and 77c of the reinforcing member 77, the upper edge of the flat portion 45a of the first core member 45, and the crest portion at the rear end of the zigzag-shaped shock absorbing member 55 disposed inside the side sill portion 15. A connecting plate 79 formed in an L shape in a plan view is connected from above to the notch 55a in which the apex is cut (see FIGS. 9 to 11). 79 of the connecting plate extending inside the side sill portion 15. The inner surface of the outer skin 42 constituting the rear wall of the side sill portion 15 and the inner surface of the outer upper wall 15c of the side sill portion 15 are connected.

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

  As shown in FIG. 1, the skeleton of the vehicle body is composed of left and right front pillar lower portions 16, 16, left and right side sill portions 15, 15, left and right rear pillar portions 17, 17, and a cross member portion 18. The lower skeleton 48 made of CFRP having a U-shape in plan view, the left and right center pillars 30 and 30 rising from the center in the front-rear direction of the left and right side sill parts 15 and 15, and the upper ends of the left and right center pillars 30 and 30 And the left and right front pillar lower portions 16, 16 and the upper ends of the left and right center pillars 30 and 30 and the left and right rear pillar portions 17 and 17 are connected to each other in the front-rear direction. The upper skeleton 49 made of CFRP having an H shape in a plan view and constituted by the front pillars 32 and 32 and the roof side rails 33 and 33 is provided. And it is possible to construct a lightweight cabin high strength between the upper framework 49.

  Further, the collision load of the frontal collision or the rearward collision is supported by the U-shaped lower skeleton 48, the center pillars 30 and 30 of the upper skeleton 49, and the roof side rails 33 and 33, thereby reducing the thickness of the floor panel portion 12. Not only can it be reduced in size and weight, but also the side sill portion 15, 15 can be supported by the side sill portions 15, 15 of the lower skeleton 48 and the center pillars 30, 30 and the roof arch 31 of the upper skeleton 49. The cross-sectional area of 15 can be made smaller and lighter.

  Since the center pillars 30 and 30 are connected to the side sill portions 15 and 15 via the metal connecting members 47 and 47, when the collision load of the side collision is input to the side sill portions 15 and 15, the metal connecting member 47. , 47 are plastically deformed by ductility and absorb the impact, so that the center pillars 30, 30 can be prevented from falling to the vehicle compartment side. In addition, since the steering hanger support brackets 58, 58 connected to the front ends of the front pillars 30, 30 are provided on the upper portions of the front pillar lower parts 16, 16, the front pillar lower part 16 is utilized by using the steering hanger support brackets 58, 58. 16 and the front pillars 30 and 30 can be increased in bonding strength.

  By the way, when a rear collision collision load is input to the rear bumper beam 36 at the rear of the vehicle, the collision load is applied from the rear bumper beam 36 to the left and right metal rear frames 34, 34 via the left and right crash rails 35, 35. Communicated. Further, since the rear frame 34 is integrally formed with a damper housing 34c that supports the upper end of the suspension damper 71 for the rear wheel, a load from the rear wheel is input to the damper housing 34c via the suspension damper 71.

  Three bolts 72 inserted from the rear to the front in three recesses 34d formed on the front edge of the side wall 34a of the rear frame 34 are outer skins that constitute the rear surface of the rear wall 14 of the floor 11. 42, a first flange 34e, which is screwed into nuts 73 inserted into corner inner surfaces at both ends in the vehicle width direction, and is bent forward at a lower front edge of the side wall 34a of the rear frame 34, and a bottom wall of the rear frame 34 Three bolts 74... Inserted from the rear toward the front in the vicinity of the second flange 34 f where the front edge of the portion 34 b is bent forward are attached to the outer skin 42 constituting the rear surface of the rear wall portion 14 of the floor 11. Since it is screwed into nuts 75... Inserted into the corner inner surfaces at both lower ends in the vehicle width direction (see FIG. 8), the rear frame 34 can be firmly fixed to the rear surface of the rear wall portion 14. When a rear load collision load or a load from the rear wheel is input to the rear frame 34, the load is transmitted to the side sill portions 15 from the corners at both ends in the vehicle width direction of the rear wall portion 14 and efficiently absorbed. Can do.

  A plurality of inner ribs 34h... And outer ribs 34i that extend upward from the upper surface of the damper housing 34c are formed on the inner surface in the vehicle width direction and the outer surface in the vehicle width direction of the rear frame 34, respectively, and the inner ribs 34h. Is connected to the lower surface of the connecting member 37 (see FIGS. 7 and 8), the rear wheel load inputted to the damper housing 34c is transferred from the connecting member 37 to the rear pillar portion 17, the cross member portion 18 and the rear end frame 38. Can be dispersed and absorbed.

  Since the front end portion of the crash rail 35 extending forward from the rear bumper beam 36 is fitted in the recess 34j of the rear frame 34, the front end where the crash rail 35 is connected to the rear frame 34 when a collision load of a rear collision is input. Therefore, the crash rail 35 can be reliably crushed and the impact energy absorption effect can be enhanced. At this time, since the cargo compartment is formed behind the rear frame 34 and the crash rail 35 is connected to the rear bottom wall 40 of the cargo compartment, the crash rail 35 is crushed together with the cargo compartment when the collision load of the rear collision is input. The impact energy absorption effect can be further enhanced.

  Further, an L-shaped connection that connects the outer skin 42 that constitutes the rear wall portion 14 and the inner skin 43 that constitutes the side sill portion 15 extends from the rear wall portion 14 to which the rear frame 34 is connected to the side sill portion 15. Since the plate 79 is disposed and the reinforcing member 77 is disposed in the lower portion of the rear wall portion 14 to which the rear frame 34 is connected (see FIGS. 9 to 11), the collision load of the rear collision is transferred from the rear frame 34 to the rear wall. It can be transmitted to the side sill part 15 and the floor panel part 12 via the part 14, the connecting plate 79 and the reinforcing member 77. Moreover, the inside of the side sill 15 is partitioned into an upper space and a lower space by the partition plate 51, and the outer end in the vehicle width direction of the partition plate 51 is sandwiched between the joining flanges 42a and 43a of the outer skin 42 and the inner skin 43 (FIG. 10). The strength of the side sill portion 15 against a collision load of a side collision, a front collision and a rear collision can be increased while minimizing an increase in weight.

  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, each member is made of CFRP, but any fiber reinforced resin such as GFRP (glass fiber reinforced resin) can be used.

12 Floor panel portion 13 Front wall portion 14 Rear wall portion 15 Side sill portion 16 Front pillar lower portion 17 Rear pillar portion 18 Cross member portion 30 Center pillar 31 Roof arch 32 Front pillar (upper front and rear frames)
33 Roof side rail (upper front and rear frame)
34 Rear frame 34c Damper housing 34e First flange 34f Second flange 34j Recess 35 Crash rail 42 Outer skin 42a Joining flange 43 Inner skin 43a Joining flange 47 Connecting member 48 Lower frame 49 Upper frame 51 Partition plate 58 Steering hanger support bracket 79 Connection Board

Claims (8)

A vehicle body constructed by combining a lower outer skin (42) and an upper inner skin (43) is a floor panel portion (12) and a front wall portion standing from the front end of the floor panel portion (12). (13), a rear wall portion (14) rising from the rear end of the floor panel portion (12), and left and right side sill portions (15) rising from an outer end in the vehicle width direction of the floor panel portion (12). The left and right front pillar lower parts (16) connecting the front wall part (13) and the left and right side sill parts (15) are connected to the rear wall part (14) and the left and right side sill parts (15). The left and right rear pillar portions (17) and a cross member portion (18) extending in the vehicle width direction along the upper ends of the rear wall portions (14) and connecting the upper ends of the left and right rear pillar portions (17). Car body structure There is,
The left and right front pillar lower portions (16), the left and right side sill portions (15), the left and right rear pillar portions (17), and the cross member portion (18) are made of CFRP having a U-shape in plan view. Constituting the lower skeleton (48),
Left and right center pillars (30) rising from the center in the front-rear direction of the left and right side sill parts (15), and a roof arch (31) connecting the upper ends of the left and right center pillars (30) in the vehicle width direction, Left and right upper front and rear frames (32, 33) connecting the upper ends of the left and right front pillar lower portions (16), the upper ends of the left and right center pillars (30), and the upper ends of the left and right rear pillar portions (17) in the front-rear direction. And an upper frame (49) having a hollow cross section made of CFRP having an H-shape in plan view.   The vehicle body structure according to claim 1, wherein the center pillar (30) is connected to the side sill portion (15) through a metal connecting member (47).   A metal rear frame (34) integrally formed with a damper housing (34c) for a rear wheel is connected to a rear surface of the rear pillar portion (17) inclined upward toward the rear. The vehicle body structure according to claim 1 or 2.   A first flange (34e) in which the lower part of the outer edge of the rear frame (34) in the vehicle width direction is bent forward and a second flange (34f) in which the lower edge of the rear frame (34) is bent forward are formed in an L shape. And the first and second flanges (34e, 34f) are connected to the corners of the outer lower end in the vehicle width direction of the outer skin (42) constituting the rear wall (14). The vehicle body structure according to claim 3.   A pair of left and right hollow crash rails (35) extending rearward from the rear surface of the rear frame (34) is provided, and a front end of the crash rail (35) is fitted into a recess (34j) formed in the rear frame (34). The vehicle body structure according to claim 3 or 4, wherein the vehicle body structure is a vehicle.   The outer skin (42) and the side sill portion constituting the rear wall portion (14) straddling the side sill portion (15) from the rear wall portion (14) to which the rear frame (34) is connected. The automobile according to any one of claims 3 to 5, characterized in that an L-shaped connecting plate (79) for connecting the inner skin (43) constituting (15) is arranged. Body structure.   The inside of the side sill portion (15) is partitioned into an upper space and a lower space by a partition plate (51), and the outer end in the vehicle width direction of the partition plate (51) is connected to the outer skin (42) and the inner skin (43). The vehicle body structure according to any one of claims 1 to 6, wherein the vehicle body structure is sandwiched between joining flanges (42a, 43a).   The steering hanger support bracket (58) connected to the front end of the upper front and rear frames (32, 33) is provided on the upper portion of the front pillar lower portion (16). The vehicle body structure according to any one of the preceding claims.

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