JP2014000861A - Frp cabin for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently disperse and absorb a collision load of a rear end collision input to a rear bumper beam of an FRP cabin from a rear end cross member to rear side frames and a rear floor panel.SOLUTION: An FRP cabin includes a rear floor panel 27, right and left rear side frames 23 and a rear end cross member 24. An FRP box-shaped member 61 is fixed into an intersecting portion between the rear side frame 23 and the rear end cross member 24, and a rear bumper beam 60 is fastened to a bumper beam fastening member 64 inserted to the box-shaped member 61. Thus the rear bumper beam 60 can be firmly fixed to the rear side frames 23 and the rear end cross member 24 by a simple and light structure, and a collision load of a rear end collision input to the rear bumper beam 60 can be efficiently transmitted and absorbed from the rear end cross member 24 to the rear side frames 23 and the rear floor panel 27.

Description

  In the present invention, an FRP cabin connects a rear floor panel, a left and right rear side frame extending in the front-rear direction along the left and right side edges of the rear floor panel, and a rear end of the left and right rear side frames. The present invention relates to an FRP cabin for an automobile including a rear end cross member extending in the vehicle width direction along the rear edge.

  The rear end cross members extending in the vehicle width direction are connected between the rear ends of the left and right rear side frames extending in the front-rear direction, and the lower surface of the rear side frame and the front surface of the rear end cross member projecting downward therefrom are connected with gussets, Patent Document 1 below discloses that a bulkhead is disposed inside a rear end cross member connected to the rear end of a rear side frame to reinforce a connection portion between the rear side frame and the rear end cross member.

Japanese Patent No. 4271135

  By the way, when a rear bumper beam is connected to the rear surface of the rear end cross member, it is necessary to disperse and absorb the collision load of the rear collision input to the rear bumper beam from the rear end cross member to the rear side frame and the rear floor panel.

  The present invention has been made in view of the above-described circumstances, and efficiently disperses and absorbs the collision load of the rear collision input to the rear bumper beam of the FRP cabin from the rear end cross member to the rear side frame and the rear floor panel. Objective.

  To achieve the above object, according to the first aspect of the present invention, an FRP cabin includes a rear floor panel, left and right rear side frames extending in the front-rear direction along the left and right side edges of the rear floor panel, and An FRP cabin for an automobile comprising a rear end cross member connected between rear ends of the left and right rear side frames and extending in a vehicle width direction along a rear edge of the rear floor panel, the rear side frame and the rear end cross An FRP cabin for an automobile is proposed, in which a box-shaped member made of FRP is fitted into an intersection of members, and a rear bumper beam is fastened to a bumper beam fastening member inserted into the box-shaped member.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the interior of the rear side frame is partitioned into an upper space and a lower space by a partition member, and the upper wall of the box-shaped member is separated from the partition member. An FRP cabin of an automobile is proposed in which the left and right side walls and the lower wall of the box-shaped member are connected to the inner surface of the lower space.

  According to the invention described in claim 3, in addition to the configuration of claim 2, an inclined surface is provided at a boundary between the rear side frame and the rear floor panel in the inner skin, and the partition member is connected to the inner skin and the inner skin. An automobile FRP characterized in that after bending in a crank shape downward and inward in the vehicle width direction from an outer end sandwiched between joint flanges that join the outer skin, the inner end is connected to the inclined surface. A cabin is proposed.

  According to a fourth aspect of the present invention, in addition to the configuration of the second or third aspect, the cabin includes a side sill that extends forward and downward from the front end of the rear side frame, and is horizontally disposed inside the side sill. An automobile FRP cabin characterized by disposing a connecting plate extending to the rear, connecting a rear end of the connecting plate to a front end of the partition member, and connecting a front end of the connecting plate to an upper wall of the side sill. Proposed.

  According to the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, the load receiving member is fixed with the outer skin sandwiched between the lower surface of the box-shaped member. An FRP cabin for an automobile is proposed in which the load receiving member protrudes downward from the lower surface of the rear bumper beam.

  According to the invention described in claim 6, in addition to the structure of claim 5, the load receiving member is formed in an L shape so as to straddle the rear side frame and the rear end cross member. FRP cabins for automobiles are proposed.

  The rear first connecting plate 49 of the embodiment corresponds to the connecting plate of the present invention, the rear partition member 51 of the embodiment corresponds to the partition member of the present invention, and the nut 64 of the embodiment corresponds to the present invention. Corresponds to the bumper beam fastening member.

  According to the configuration of the first aspect, the FRP cabin connects the rear floor panel, the left and right rear side frames extending in the front-rear direction along the left and right side edges of the rear floor panel, and the rear ends of the left and right rear side frames. And a rear end cross member extending in the vehicle width direction along the rear edge of the rear floor panel. An FRP box-like member is fitted in the intersection of the rear side frame and the rear end cross member, and the rear bumper beam is fastened to the bumper beam fastening member inserted into the box-like member, so that the rear side frame and the rear end have a simple and lightweight structure. The rear bumper beam is firmly fixed to the cross member, and the collision load of the rear collision input to the rear bumper beam can be efficiently transmitted and absorbed from the rear end cross member to the rear side frame and the rear floor panel.

  According to the configuration of claim 2, the interior of the rear side frame is partitioned into the upper space and the lower space by the partition member, the upper wall of the box-shaped member is connected to the partition member, and the left and right side walls and the lower wall of the box-shaped member are Since it is connected to the inner surface of the space, the bumper beam can be supported more firmly by the box-shaped member whose rigidity is increased by restraining the entire circumference.

  According to the third aspect of the present invention, the inclined surface is provided at the boundary between the rear side frame and the rear floor panel in the inner skin, and the partition member is directed downward from the outer end portion sandwiched between the joining flanges for joining the inner skin and the outer skin. After bending inward in the vehicle width direction in a crank shape, the inner end is connected to the inclined surface, so that the height of the box-shaped member can be matched to the height of the rear bumper beam without increasing the size of the box-shaped member it can.

  According to the configuration of claim 4, the cabin includes a side sill extending forward and downward from the front end of the rear side frame, the connecting plate extending horizontally is disposed inside the side sill, and the rear end of the connecting plate is used as the front end of the partition member. Since the front end of the connecting plate is connected to the upper wall of the side sill, when the collision load input to the rear bumper beam is transmitted from the rear end cross member to the side sill via the rear side frame, the collision load is transmitted to the rear side frame. It can be reliably transmitted from the partition member to the side sill via the connecting plate and absorbed.

  According to the fifth aspect of the present invention, the load receiving member is fixed with the outer skin sandwiched between the lower surface of the box-shaped member, and the load receiving member protrudes downward from the lower surface of the bumper beam. A collision load input to a low position can be received by the load receiving member and transmitted to the rear bumper beam and the rear side frame.

  According to the sixth aspect of the present invention, since the load receiving member is formed in an L shape so as to straddle the rear side frame and the rear end cross member, the connection portion between the rear side frame and the rear end cross member can be effectively reinforced. Can do.

The perspective view of the cabin made from CFRP of a car. FIG. 2 is a two-direction arrow view of FIG. 1. The top view of the cabin which removed the inner skin. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a view in the direction of arrows 5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. FIG. 8 is a view taken in the direction of arrow 8 in FIG. 3.

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

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

  The cabin 11 has a hollow structure in which an inner skin 19 and an outer skin 20 are joined up and down, a dash panel 21 at the front end, a pair of left and right side sills 22, 22 extending rearward from both ends of the dash panel 21 in the vehicle width direction, and a side sill 22. 22, a pair of left and right rear side frames 23, 23 extending rearward and upward from the rear end, a rear end cross member 24 connecting the rear ends of the rear side frames 23, 23 in the vehicle width direction, a dash panel 21 and left and right side sills 22 , 22, a kick-up portion 26 rising from the rear end of the front floor panel 25, and extending rearward from the upper end of the kick-up portion 26 to connect to the rear side frames 23, 23 and the rear end cross member 24. And a rear floor panel 27. A rear bumper beam 60 extending in the vehicle width direction is fixed to the rear surface of the rear end cross member 24.

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

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

  Next, the structure of the cabin 11 will be described in detail with reference to FIGS.

  Inner skin 19 and outer skin 20 constituting cabin 11 have joining flanges 19a and 20a extending so as to surround the outer peripheries of dash panel 21, left and right side sills 22 and 22, left and right rear side frames 23 and 23, and rear end cross member 24. The both joining flanges 19a and 20a are joined by adhesion, welding, rivets or the like (see FIGS. 1, 6 and 7).

  The front floor panel 25 includes left and right core members 42 and 42 sandwiched between the inner skin 19 and the outer skin 20, and the inclined wall 37 of the dash panel 21 is a core member 43 sandwiched between the inner skin 19 and the outer skin 20. , 43, the kick-up portion 26 includes a core member 45 sandwiched between the inner skin 19 and the outer skin 20, and the rear floor panel 27 includes a core member 46 sandwiched between the inner skin 19 and the outer skin 20 ( (See FIG. 3). The core material 42 of the front floor panel 25 is constituted by a corrugated plate having ripple-shaped uneven portions 42a, and the core material 43 of the inclined wall 37 and the core material 45 of the kick-up portion 26 are uneven and extend linearly in the vehicle width direction. It is comprised with the corrugated sheet which has part 43a ..., 45a ....

  On the other hand, the core material 46 of the rear floor panel 27 is configured by combining a pair of side core materials 46A and 46A and a central core material 46B sandwiched therebetween. Each of the side core members 46A connected to the inner surface in the vehicle width direction of the rear side frame 23 and the front surface of the half portion in the vehicle width direction of the rear end cross member 24 is formed in a right triangle shape that is tapered so as to narrow toward the front. And a corrugated plate having a concavo-convex portion 46a extending linearly in parallel with the hypotenuse. The central core material 46B corresponding to the remaining portion of the core material 46 has both front edges in the vehicle width direction continuous to the inner surfaces in the vehicle width direction of the left and right rear side frames 23, 23, and from there to narrow toward the rear. It is formed in the shape of a tapered isosceles triangle, and is constituted by a corrugated plate having concavo-convex portions 46b extending linearly in the vehicle width direction.

  The inside of the side sill 22 formed in a hollow is partitioned into an upper space 22a and a lower space 22b by a front partition member 47 that is arranged in the horizontal direction and extends in the front-rear direction (see FIGS. 4 and 5). The outer end in the vehicle width direction of the front partition member 47 is sandwiched between the joint flanges 19 a and 20 a of the inner skin 19 and the outer skin 20, and the inner end in the vehicle width direction is connected to the inner skin 19 constituting the inner wall of the side sill 22. . Further, the third bulkheads 45b and 45b protruding from both ends in the vehicle width direction of the core material 45 of the kick-up portion 26 are connected to the outer wall, the upper wall and the lower wall of the side sill 22 while being fitted inside the side sill 22, respectively. A flange 47a provided at the rear end of the front partition member 47 and extending in the vehicle width direction is connected to the front surface of the third bulkhead 45b at the end of the core member 45 extending inside the side sill 22 (see FIG. 5).

  A front connection plate 48 extending in the horizontal direction is disposed in the upper space 22a in the front portion of the side sill 22 (see FIGS. 3 and 4). The left and right side edges of the front connecting plate 48 are connected to the inner wall and the outer wall of the side sill 22, the front end is connected to the rear surface of the wheel house rear wall 33 a constituting the front wall of the front pillar lower front portion 33, and the rear end is connected to the side sill 22. It is connected to the lower surface of the upper wall 22e (see FIG. 4).

  A rear first connecting plate 49 extending in the horizontal direction is disposed in the upper space 22a at the rear of the side sill 22 (see FIGS. 3 and 4). The left and right side edges of the rear first connecting plate 49 are connected to the inner and outer walls of the side sill 22, the front end is connected to the lower surface of the upper wall 22 e of the side sill 22, and the rear end is the end of the core material 45 of the kick-up portion 26. The third bulkhead 45 b is connected to the front surface of the portion that fits into the side sill 22. A rear second connection plate 50 extending in the horizontal direction is disposed above the rear first connection plate 49. The rear second connecting plate 50 is formed to be shorter in the front-rear direction than the rear first connecting plate 49, both left and right edges are connected to the inner and outer walls of the side sill 22, and the front end is connected to the lower surface of the upper wall 22e of the side sill 22. The rear end is connected to the front surface of the flat portion 45 c that protrudes upward from the upper end of the third bulkhead 45 b at the end of the core material 45 of the kick-up portion 26.

  An upper energy absorbing member 52 is disposed in the upper space 22a of the side sill 22, and a lower energy absorbing member 53 is disposed in the lower space 22b of the side sill 22 (see FIGS. 4 and 5). The upper energy absorbing member 52 is made of a plate material that bends in a zigzag manner, and the upper end crests 52a and the lower end troughs 52b are alternately continuous. Similarly, the lower energy absorbing member 53 is made of a plate material that bends in a zigzag manner, and the upper end crests 53a and the lower end troughs 53b are alternately continuous.

  The interior of the rear side frame 23 extending rearward and upward from the rear end of the side sill 22 is partitioned into an upper space 23a and a lower space 23b by a rear partition member 51 extending in the front-rear direction (see FIGS. 3, 4, 5, and 7). . The front end of the rear partition member 51 is connected to the rear end of the rear first connecting plate 49 of the side sill 22 with the third bulkhead 45b in which the core material 45 of the kick-up portion 26 is fitted in the side sill 22 interposed therebetween.

  The inner skin 19 constituting the upper half of the rear side frame 23 includes a first inclined surface 19b extending obliquely upward from the rear floor panel 27 toward the vehicle width direction outer side, and a side wall 19c continuous with the first inclined surface 19b. The upper wall 19d, the side wall 19e, and the joint flange 19a are provided (see FIG. 7). The outer skin 20 constituting the lower half of the rear side frame 23 includes a second inclined surface 20b extending obliquely downward from the rear floor panel 27 toward the vehicle width direction outer side, and a lower continuous with the second inclined surface 20b. A wall 20c, an outer wall 20d, and the flange portion 20a are provided (see FIG. 7).

  The rear partition member 51 includes a flange portion 51a sandwiched between the joint flanges 19a and 20a of the inner skin 19 and the outer skin 20, and a vertical wall 51b that is bent downward from the inner end in the vehicle width direction of the flange portion 51a and extends downward. A horizontal wall 51c extending inward in the vehicle width direction from the lower end of the vertical wall 51b, and an inclined wall 51d bent obliquely downward from an inner end in the vehicle width direction of the horizontal wall 51c and connected to the lower half of the lower surface of the first inclined surface 19b (See FIG. 7). The width W1 in the vehicle width direction of the rear partition member 51 sandwiched between the flange portion 51a and the inclined wall 51d is larger than the width W2 in the vehicle width direction of the rear side frame 23 above the rear partition member 51. It is larger by the amount that penetrates the lower surface.

  A CFRP box-like member 61 having an upper wall 61a, a side wall 61b, a lower wall 61c, a side wall 61d, and a rear wall 61e and having an open front is fitted to the rear end of the lower space 23b of the rear side frame 23 ( 6 to 8). The box-shaped member 61 has an upper wall 61 a connected to the lower surface of the lateral wall 51 c of the rear partition member 51, a side wall 61 b connected to the outer wall 20 d of the outer skin 20, and a lower wall 61 c connected to the lower wall 20 c of the outer skin 20. The side wall 61d is connected to the first inclined surface 19b of the inner skin 19 and the second inclined surface 20b of the outer skin 20, and the rear wall 61e is connected to the rear wall 20e of the rear side frame 23 (see FIG. 6).

  The CFRP rear bumper beam 60 includes a main body 62 having an upper wall 62a, a front wall 62b, and a lower wall 62c and having a U-shaped cross section that opens rearward, and a wave disposed inside the main body 62. A plate-like core material 63 (see FIGS. 6 and 8). Two nuts 64, 64 are inserted into the rear wall 61 e of the box-shaped member 61, and two bolts 65, 65 that pass through the front wall 62 b of the main body 62 of the rear bumper 61 from the rear to the front are nuts. The rear bumper beam 61 is fastened to the rear surface of the rear end cross member 24 by being screwed to 64 and 64. The height of the upper wall 62a of the rear bumper beam 60 substantially matches the height of the rear partition member 51 of the rear side frame 23, and the height of the lower wall 62c of the rear bumper beam 60 is the height of the lower wall 20c of the rear side frame 23. It almost matches.

  If a nut is also inserted into the rear surface of the rear end cross member 24, and a bolt that passes through the intermediate portion in the vehicle width direction of the rear bumper 61 from the rear to the front is screwed into the nut, the rear bumper beam 61 is attached to the rear end cross member 24. It can be tightened more firmly on the rear surface.

  A CFRP load receiving member 66 formed in an L shape in plan view is fixed to the lower surface of the intersection of the rear side frame 23 and the rear end cross member 24 (see FIGS. 6 to 8). The load receiving member 66 is a tray-like member having an open upper surface, and is fixed so as to face the lower side of the box-shaped member 61 with the outer skin 20 on the lower surface of the intersection of the rear side frame 23 and the rear end cross member 24 interposed therebetween. The In a state where the load receiving member 66 is fixed, the bottom surface 66 a protrudes below the lower end of the rear bumper beam 61.

  The two stays 18 and 18 that support and reinforce the roll bar 17 extending in the vehicle width direction from the rear are arranged in the front-rear direction in a plan view. Therefore, the roll bar 17 and the stays 18 and 18 are orthogonal in the plan view. (See FIG. 2). The lower end of the stay 18 is supported on the rear side frame 23 via a support member 67 made of aluminum alloy (see FIGS. 6 to 8).

  The support member 67 is a member having an L-shaped cross section having an upper wall 67a and a side wall 67b fixed to the upper wall 19d and the side wall 19e of the rear side frame 23, and a mounting flange provided at the lower end of the stay 18 on the upper wall 67a. 18a is fastened with bolts 68. A damper support seat 67c protrudes horizontally from the side wall 67b along the side wall 19e of the rear side frame 23 in the vehicle width direction, and a pair of front and rear reinforcing ribs 67d and 67e extend in the vertical direction between the damper support seat 67c and the side wall 67b. Connected.

  In the upper space 23a of the rear side frame 23, a first bulkhead 69 and a second bulkhead 70 having three sides connected to the side wall 19c, the upper wall 19d and the side wall 19e are arranged. The first and second bulkheads 69 and 70 are arranged so as to sandwich the support member 67 from the front and rear, and two nuts 71 and 71 are fixed to their mutually facing surfaces. The four bolts 72 penetrating the side wall 67b are screwed into the nuts 71, so that the support member 67 is fixed to the rear side frame 23, and the upper end of the damper 73 of the rear suspension device is the damper support seat of the support member 67. Fastened to 67c.

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

  FRP box-like members 61, 61 are fitted into the intersections of the rear side frames 23, 23 and the rear end cross member 24, and the rear bumper beam 60 is fastened with bolts 65 to nuts 64 inserted into the box-like members 61, 61. Since it is fastened (see FIGS. 6 to 8), the rear bumper beam 60 is firmly fixed to the rear side frames 23 and 23 and the rear end cross member 24 with a simple and lightweight structure, and the rear collision is input to the rear bumper beam 60. The load can be efficiently transmitted to and absorbed by the rear side frames 23, 23 and the rear floor panel 27. In particular, the interior of the rear side frame 23 is partitioned into an upper space 23 a and a lower space 23 b by a rear partition member 51, and an upper wall 61 a of the box-shaped member 61 is connected to the rear partition member 51, and left and right side walls 61 b and 61 d of the box-shaped member 61 are connected. Since the lower wall 61c is connected to the inner surface of the lower space 23b, the bumper beam 60 can be more firmly supported by the box-like member 61 whose entire circumference is restrained and rigidity is increased.

  When a forward collision load is input from the rear bumper beam 60 to the rear floor panel 27 through the rear end cross member 24, the core material 46 of the rear floor panel 27 has two sides on the rear side frames 23 and 23 and the rear end cross member 24. The left and right triangular side core members 46A and 46A that are connected and taper forward, and the triangles that are sandwiched between the left and right side core materials 46A and 46A and taper taper backward. Since the central core material 46B has a shape (see FIG. 3), the collision load of the rear collision input to the rear end cross member 24 is not only directly distributed from the rear end cross member 24 to the rear side frames 23, 23 but also to the left and right sides. It is transmitted to the left and right rear side frames 23, 23 via triangular side core members 46A, 46A. By dispersing the can absorb impact load of the rear-end collision efficiently in a simple structure and lightweight.

  In particular, the left and right side core members 46A, 46A are made of corrugated plates having a large number of concavo-convex portions 46a extending along the direction of the boundary line with the central core member 46B. The center core material 46B is made of a corrugated plate having a large number of concavo-convex portions 46b extending in the vehicle width direction. By functioning as a brace 46B, the left and right side core members 46A, 46A can be prevented from being deformed inward in the vehicle width direction, and the collision load can be transmitted to the rear side frames 23, 23 more efficiently. .

  At this time, the rear ends of the left and right side core members 46A, 46A are fitted into the rear end cross member 24 and connected to the rear wall of the rear end cross member 24 (see FIGS. 6 and 8). 24, the collision load of the rear collision can be more reliably transmitted to the left and right side core members 46A and 46A.

  In addition, the cabin 11 includes a side sill 22 that extends forward and downward from the front end of the rear side frame 23, a rear first connecting plate 49 that extends horizontally is disposed inside the side sill 22, and the rear end of the rear first connecting plate 49 is the rear side frame. 23 is connected to the front end of the rear partition member 51, and the front end of the rear first connecting plate 49 is connected to the upper wall 22e of the side sill 22 (see FIG. 4), so that the collision load input to the rear bumper beam 60 is applied to the rear end cross. When transmitted from the member 24 to the side sill 22 via the rear side frame 23, the collision load is reliably transmitted from the rear partition member 51 of the rear side frame 23 to the side sill 22 via the rear first connecting plate 49 and absorbed. Can do.

  Further, since the interior of the rear side frame 23 is partitioned into the upper space 23a and the lower space 23b by the rear partition member 51, the rear cut plate 51 secures the rigidity of the rear side frame 23 and reliably supports the collision load of the side collision. The volume of the luggage compartment can be increased by increasing the height of the rear side frame 23.

  The inner skin 19 is provided with a first inclined surface 19b at the boundary between the rear side frame 23 and the rear floor panel 27, and the outer skin 20 is provided with a second inclined surface 20b at the boundary between the rear side frame 23 and the rear floor panel 27. Since the inner end in the vehicle width direction of the rear partition plate 51 that partitions the interior into the upper space 23a and the lower space 23b is connected to the first inclined surface 19b (see FIG. 7), the first inclined surface 19b and the second inclined surface 20b are combined. As a result, it is possible not only to reliably support the collision load of the rear collision distributed via the rear floor panel 27, but also when the collision load of the side collision is input to the side sill 22, the collision load is efficiently applied to the rear floor panel 27. To prevent the side sill 22 from falling inward in the vehicle width direction. Can.

  The rear partition member 51 includes a vertical wall 51b and a horizontal wall 51b which are bent in a crank shape downward and inward in the vehicle width direction from the flange portion 51a sandwiched between the joining flanges 19a and 20a of the inner skin 19 and the outer skin 20. The inclined wall 51c extends obliquely from 51b and is connected to the first inclined surface 19b of the inner skin 19 (see FIG. 7), so that the height of the box-shaped member 61 can be increased without increasing the size of the rear bumper beam 60. The rear partition member 51 is connected to the first inclined surface 19b, so that the width W1 of the rear partition member 51 in the vehicle width direction is set to the width W2 of the rear side frame 23 in the vehicle width direction. It is possible to further increase the falling rigidity of the rear side frame 23.

  Further, the load receiving member 66 is fixed with the outer skin 20 sandwiched between the lower surface of the box-shaped member 61, and the bottom surface 66a of the load receiving member 66 protrudes downward from the lower surface of the rear bumper beam 60 (FIGS. 6 to 8). The collision load input to a position lower than the rear bumper beam 60 can be received by the load receiving member 66 and transmitted to the rear bumper beam 60 and the rear side frame 23. Moreover, since the load receiving member 66 is formed in an L shape so as to straddle the rear side frame 23 and the rear end cross member 24, the connecting portion between the rear side frame 23 and the rear end cross member 24 can be effectively reinforced.

  In addition, since the upper portion of the roll bar 17 is connected to the rear side frames 23 and 23 via the pair of stays 18 and 18, the roll bar 17 can be greatly increased in falling rigidity. At this time, since the stays 18 and 18 are orthogonal to the roll bar 17 in plan view (see FIG. 2), the stays 18 and 18 can reliably prevent the roll bar 17 from falling in the front-rear direction. Further, since the lower end of the stay 18 is fixed to the rear side frame 23 via the support member 67, not only can the stay 18 and the rear side frame 23 be firmly fixed, but also the support member 67 can be used to Since the upper end of the damper 73 is supported (see FIGS. 1 and 8), it is possible to firmly support both the stay 18 of the roll bar 17 and the damper 73 of the rear suspension device to the rear side frame 23 using the support member 67. This makes it possible to reduce the weight of the vehicle body as compared with the case where they are separately supported on the rear side frame 23.

  In particular, the support member 67 is an L-shaped member having an upper wall 67a and a side wall 67b fixed to the rear side frame 23. The stay 18 is fixed to the upper wall 67a, and a damper support seat 67c protruding from the side wall 67b. Is connected to the side wall 67b by the front and rear reinforcing ribs 67d and 67e (see FIGS. 6 to 8), the rigidity of the damper support seat 67c with respect to the support member 67 is increased and the load input from the damper 73 to the damper support seat 67c is ensured. Can take it.

  The rear side frame 23 includes a first bulk head 69 and a second bulk head 70, and the support member 67 is located between the first bulk head 69 and the second bulk head 70, so that the stay 18 is fixed to the rear side frame 23. The strength of the portion can be increased by the first and second bulk 69 and 70 heads. Moreover, since the first bulkhead 69 and the second bulkhead 70 are provided with nuts 71 to which bolts 72 to fasten the support member 67 are screwed, the support member 67 can be easily and firmly fixed. Further, the interior of the rear side frame 23 is partitioned into the upper space 23a and the lower space 23b by the rear partition plate 51, and the first bulkhead 69 and the second bulkhead 70 are disposed in the upper space 23a. The first and second bulkheads 69 and 70 can be miniaturized to the minimum necessary to reduce the weight.

  Furthermore, the rear side frame 23 includes a third bulkhead 45b in which the core material 45 of the kick-up portion 26 extends outward in the vehicle width direction in the vicinity of the mounting portion of the roll bar 17, and the third bulkhead 45b is attached to the rear side frame 23. Connected to the front partition member 47, the rear first connecting plate 49, the rear second connecting plate 50, the upper energy absorbing member 52, and the lower energy absorbing member 53, which are reinforcing members disposed inside the side sill 22 extending forward and downward from the front end. Therefore (see FIGS. 4 and 5), the rigidity can be ensured even when the cross-sectional shape of the rear side frame 23 is high in the vertical direction.

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

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

11 cabin 19 inner skin 19a joint flange 19b inclined surface 20 outer skin 20a joint flange 22 side sill 22e upper wall 23 rear side frame 23a upper space 23b lower space 24 rear end cross member 27 rear floor panel 49 rear first connecting plate (connecting plate)
51 Rear partition member (partition member)
60 Rear bumper beam 61 Box-shaped member 61a Upper wall 61b Side wall 61c Lower wall 61d Side wall 64 Nut (bumper beam fastening member)
66 Load receiving member

Claims (6)

An FRP cabin (11) includes a rear floor panel (27), left and right rear side frames (23) extending in the front-rear direction along the left and right side edges of the rear floor panel (27), and the left and right rear side frames (23). A FRP cabin for an automobile comprising a rear end cross member (24) connected in the vehicle width direction along the rear edge of the rear floor panel (27) connected between rear ends of the rear floor panel (27),
An FRP box-shaped member (61) is fitted in the intersection of the rear side frame (23) and the rear end cross member (24), and is inserted into the bumper beam fastening member (64) inserted into the box-shaped member (61). An FRP cabin of an automobile characterized by fastening a rear bumper beam (60).   The interior of the rear side frame (23) is partitioned into an upper space (23a) and a lower space (23b) by a partition member (51), and the upper wall (61a) of the box-shaped member (61) is used as the partition member (51). The vehicle according to claim 1, wherein the left and right side walls (61b, 61d) and the lower wall (61c) of the box-shaped member (61) are connected to the inner surface of the lower space (23b). FRP cabin.   An inclined surface (19b) is provided at the boundary between the rear side frame (23) and the rear floor panel (27) in the inner skin (19), and the partition member (51) is connected to the inner skin (19) and the outer skin ( 20) is bent from the outer end sandwiched between the joining flanges (19a, 20a) to be cranked downward and inward in the vehicle width direction, and then the inner end is connected to the inclined surface (19b). The FRP cabin of an automobile according to claim 2, wherein   The cabin (11) includes a side sill (22) extending forward and downward from a front end of the rear side frame (23), and a connecting plate (49) extending horizontally is disposed inside the side sill (22), and the connecting plate The rear end of (49) is connected to the front end of the partition member (51), and the front end of the connecting plate (49) is connected to the upper wall (22e) of the side sill (22). The FRP cabin of an automobile according to claim 2 or claim 3.   A load receiving member (66) is fixed to the lower surface of the box-shaped member (61) with the outer skin (20) sandwiched therebetween, and the load receiving member (66) is placed below the lower surface of the rear bumper beam (60). The FRP cabin of an automobile according to any one of claims 1 to 4, wherein the cabin is protruded.   The FRP made of an automobile according to claim 5, wherein the load receiving member (66) is formed in an L shape so as to straddle the rear side frame (23) and the rear end cross member (24). cabin.

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