JP5858365B2 - Car floor structure - Google Patents

Description

  The present invention has an opening that opens downward and extends in the front-rear direction at the center in the vehicle width direction of a floor panel portion made of fiber reinforced resin with a core material sandwiched between a lower outer skin and an upper inner skin. The present invention relates to an automobile floor structure in which a floor tunnel is formed and an opening of the floor tunnel is bridged by a tunnel brace extending in a vehicle width direction.

  A tunnel brace that bridges and reinforces the opening of the floor tunnel formed on the floor panel of the automobile body made of fiber reinforced resin is composed of an extrusion molding material made of aluminum or aluminum alloy with a `` eye '' shaped cross section This is known from Patent Document 1 below.

JP 2010-247653 A

  However, since the entire tunnel brace protrudes downward from the lower surface of the floor panel portion, the one described in Patent Document 1 not only reduces the minimum ground clearance of the vehicle body due to the tunnel brace but also causes side collisions. When the collision load is input to the floor panel, the center of the floor panel in the thickness direction and the center of the tunnel brace in the thickness direction are greatly displaced. Therefore, there is a problem in that it is difficult to efficiently transmit the power to the floor panel portion on the other side in the vehicle width direction, and it is difficult to sufficiently increase the strength of the floor panel portion including the floor tunnel.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to enhance a reinforcing effect of a floor panel portion by a tunnel brace and to avoid a decrease in the minimum ground clearance due to the tunnel brace.

  In order to achieve the above object, according to the invention described in claim 1, the center in the vehicle width direction of the floor panel portion made of fiber reinforced resin with the core material sandwiched between the lower outer skin and the upper inner skin A floor structure of an automobile in which a floor tunnel having an opening that opens downward is formed to extend in the front-rear direction, and the opening of the floor tunnel is bridged by a tunnel brace extending in the vehicle width direction. A tunnel brace for fastening the tunnel brace to the outer skin and the overlapped portion of the inner skin, the outer skin being raised upward and overlapping the lower surface of the inner skin at a portion where the portion is continuous with the floor tunnel An automobile floor structure characterized by forming a fastening seat is proposed.

  Further, according to the invention described in claim 2, in addition to the structure of claim 1, a floor structure of an automobile is proposed in which the tunnel brace is a plate material bent in a waveform when viewed in the vehicle width direction. Is done.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the inner skin is raised upward in the tunnel brace fastening seat. Proposed.

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, the tunnel brace fastening seat is covered by a cross member coupled to the upper surface of the inner skin. An automobile floor structure characterized by the above is proposed.

  According to the invention described in claim 5, in addition to the configuration of claim 4, the cross member is a member made of fiber reinforced resin having a front wall and a rear wall and having an open lower surface, and is perpendicular to the vertical direction. An automobile floor structure is proposed in which a seat fastening seat for fastening a seat is formed on the front wall having an inclination angle with respect to the rear wall larger than the inclination angle of the rear wall.

  According to the invention described in claim 6, in addition to the structure of any one of claims 1 to 5, the boundary between the floor panel portion and the side sill portion continuously provided on the outer side in the vehicle width direction. In addition, a floor structure for an automobile is proposed in which pipe-shaped load transmission members extending in the front-rear direction are arranged.

  According to the invention described in claim 7, in addition to the configuration of any one of claims 1 to 6, the tunnel brace on the front side and the rear side is provided, and the tunnel brace on the rear side is An automobile floor structure is proposed, which is arranged in the vicinity of an in-vehicle component storage recess formed at the rear of the floor panel.

  According to the invention described in claim 8, in addition to the configuration of claim 7, the core material includes a corrugated plate made of a fiber reinforced resin having a large number of uneven portions extending in a ripple pattern, An automobile having a vertex on a line extending in the vehicle width direction through a middle position in the front-rear direction of the front and rear tunnel braces and expanding toward the front and rear tunnel braces Floor structure is proposed.

  The recess 12a of the floor panel portion 12 of the embodiment corresponds to the tunnel brace fastening seat of the present invention, and the nut 66 of the embodiment corresponds to the seat fastening seat of the present invention.

  According to the configuration of the first aspect, the automobile body opens downward in the center in the vehicle width direction of the floor panel portion made of fiber reinforced resin with the core material sandwiched between the lower outer skin and the upper inner skin. A floor tunnel having an opening and extending in the front-rear direction is formed, and the opening of the floor tunnel is bridged with a tunnel brace extending in the vehicle width direction. The outer skin rises upward at the part where the floor panel part continues to the floor tunnel and is superimposed on the lower surface of the inner skin, forming a tunnel brace fastening seat for fastening the tunnel brace to the overlapping part of the outer skin and inner skin Therefore, the tunnel brace is prevented from projecting downward from the floor panel to ensure the minimum ground clearance of the vehicle body, and the tunnel brace is brought closer to the center of the floor panel in the thickness direction so that the impact load of the side collision is reduced to the floor. When input to the panel portion, the collision load can be effectively supported by the tunnel brace to prevent the floor tunnel from being crushed.

  According to the second aspect of the present invention, since the tunnel brace is a plate material that bends in a waveform when viewed in the vehicle width direction, the strength of the tunnel brace against the collision load of the side collision can be increased.

  According to the third aspect of the present invention, since the inner skin is raised upward in the tunnel brace fastening seat, the tunnel brace fastening seat is deepened by that amount to increase the thickness of the tunnel brace in the vertical direction. The strength of the tunnel brace against impact load can be increased.

  According to the fourth aspect of the present invention, since the tunnel brace fastening seat is covered by the cross member coupled to the upper surface of the inner skin, it is only possible to avoid a reduction in the cabin space due to the tunnel brace fastening seat being raised upward. In addition, the load input to the tunnel brace fastening seat can be dispersed and absorbed by the cross member.

  Further, according to the configuration of claim 5, the cross member is a member made of fiber reinforced resin having a front wall and a rear wall, the lower surface of which is open, and the front of the cross member is larger than the inclination angle of the rear wall. Since the seat fastening seat for fastening the seat to the wall is formed, not only the area of the front wall increases and the seat can be easily attached, but also the strength of the front wall against the collision load in the front-rear direction can be increased. .

  According to the configuration of claim 6, since the pipe-shaped load transmitting member extending in the front-rear direction is arranged at the boundary between the floor panel portion and the side sill portion provided on the outer side in the vehicle width direction, a side collision with the side sill portion. When the collision load is input, the side sill portion can be prevented from falling with respect to the floor panel portion, and the collision load can be transmitted from the side sill portion to the floor panel portion and absorbed.

  According to the configuration of claim 7, since the front and rear tunnel braces are provided, and the rear tunnel brace is disposed in the vicinity of the in-vehicle component storage recess formed in the rear portion of the floor panel portion, the in-vehicle component storage recess is provided. The floor panel portion having reduced strength due to the formation can be reinforced with the tunnel brace on the rear side.

  Further, according to the configuration of claim 8, the core material is made of a fiber reinforced resin corrugated plate having a large number of uneven portions extending in a ripple shape, and the uneven portions are located at intermediate positions in the front-rear direction of the front and rear tunnel braces. It has an apex on the line that passes through in the vehicle width direction and expands toward the front and rear tunnel braces, so the side load collision load input to the vehicle width direction one side of the floor panel part is It is transmitted to the front and rear tunnel braces via the concave and convex portions of the core material on one side in the direction, and from there to the core material on the other side in the vehicle width direction, so that the impact load of the side collision on the entire floor panel portion Can be dispersed and absorbed.

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 four-direction arrow view of FIG. 2. FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. The disassembled perspective view of a partition plate, a reinforcement member, an inner side bulkhead, and an outer side bulkhead. 8A-8A line-8D-8D sectional view taken on the line of FIG. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 1. FIG. 10 is a sectional view taken along line 10-10 in FIG. 9; FIG. 11 is a view in the direction of arrow 11 in FIG.

  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 pair of left and right rear pillar portions 17 and 17 extending from the rear ends of the side sill portions 15 and 15 along the left and right side edges of the rear wall portion 14, and a cross member connecting the upper ends of the left and right rear pillar portions 17 and 17 in the vehicle width direction. Part 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 CFRP cross members 29, 29 extending in the vehicle width direction. A pair of left and right center pillars 30, 30 are erected from between the front and rear intermediate portions of the left and right side sill portions 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 left and right center pillars 30 and 30 and the roof arch 31 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.

  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 rear frames 34, 34. 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 with joining flanges 42a and 43a extending along the member portion 18 (see FIGS. 2 and 8). 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 by CFRP are sandwiched, and between the outer skin 42 and the inner skin 43 of the front wall portion 13. The core members 45, 45 formed in a corrugated shape with CFRP are sandwiched (see FIGS. 5 and 11). The core materials 44 and 44 of the floor panel portion 12 and the core materials 45 and 45 of the front wall portion 13 are divided into left and right by the floor tunnel 28.

  Next, the structures of the front pillar lower portion 16 and the side sill portion 15 will be described in detail with reference to FIGS.

  The outer shell of the side sill portion 15 that extends in the horizontal direction and the outer shell of the front pillar lower portion 16 that rises forward from the front end are formed by joining the outer skin 42 and the inner skin 43 with joint flanges 42a and 43a. Inside the side sill portion 15, the outer edge in the vehicle width direction is sandwiched between the joining flanges 42 a and 43 a of the outer skin 42 and the inner skin 43, and the joining flange 51 a that is bent upward in the vehicle width direction is joined to the inner surface of the inner skin 43. It is partitioned up and down by the partition plate 51 made of CFRP. A front portion of the partition plate 51 extends into the front pillar lower portion 16, and a joint flange 51a at the front end thereof is joined to the front wall 16a of the front pillar lower portion 16 (see FIGS. 5 and 6). The upper half of the side sill portion 15 constituted by the inner skin 43 includes an inner upper wall 15b on the inner side in the vehicle width direction and an outer upper wall 15c on the outer side in the vehicle width direction with the step portion 15a interposed therebetween. The height is higher than the height of the outer upper wall 15c (see FIGS. 8C and 8D).

A CFRP reinforcing member 52 is disposed inside the front pillar lower portion 16. The reinforcing member 52 formed in an L shape in a side view is a hat-shaped cross-section member that opens forward and downward, and the width in the vehicle width direction is the width of the front pillar lower portion 16 in the vehicle width direction. It is formed smaller than the width (see FIGS. 7 and 8A to 8D). The front joint flanges 52a, 52a of the reinforcing member 52 are joined to the rear surface of the front wall 16a of the front pillar lower portion 16, the rear wall 52b of the reinforcing member 52 is connected to the front surface of the rear wall 16b of the front pillar lower portion 16, The lower joining flanges 52c and 52c of the reinforcing member 52 are joined to the upper surface of the partition plate 51 of the side sill portion 15, and the upper wall 52d of the reinforcing member 52 is connected to the lower surface of the inner upper wall 15b of the side sill portion 15 (FIG. 8 ( A) to (D)). At this time, the front joint flanges 52a and 52a of the reinforcing member 52 are wider than the reinforcing member 52 at the front end of the side sill portion 15 that faces the rear end of the upper member 26 across the front wall 16a of the front pillar lower portion 16. On the inner side in the direction, an inner bulkhead 53 made of CFRP having a triangular shape in plan view is horizontally disposed (see FIGS. 7 and 8B). A joint flange 53 a obtained by bending the outer periphery of the inner bulkhead 53 downward is connected to the rear surface of the front wall 16 a of the front pillar lower portion 16, the inner wall 52 e of the reinforcing member 52, and the inner wall 15 d of the side sill portion 15.

  An outer bulkhead 54 made of CFRP having a trapezoidal shape in plan view is horizontally disposed outside the reinforcing member 52 at the front end of the side sill portion 15 (see FIGS. 7 and 8B to 8D). )reference). A joining flange 54 a obtained by bending the outer periphery of the outer bulkhead 54 downward is connected to the outer wall 52 f of the reinforcing member 52 and the outer wall 15 e of the side sill portion 15. The inner bulkhead 53 is disposed at a slightly higher position than the outer bulkhead 54.

  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 (see FIGS. 5 and 6). The upper end of the shock absorbing member 55 is connected to the lower surface of the inner upper wall 15b of the side sill portion 15, and the lower end of the shock absorbing member 55 is connected to the upper surface of the partition plate 51. The notches 55a... With the end portions notched are connected to the lower surface of the outer upper wall 15c of the side sill portion 15 (see FIG. 5). However, only the notch 55b in the foremost peak portion of the shock absorbing member 55 is connected to the lower surface of the outer bulkhead 54 (see FIGS. 5 and 8C).

  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. (See FIGS. 6 and 8C and 8D).

  Four nuts 57 are inserted on both sides in the vehicle width direction of the reinforcing member 52 in the rear wall 16b of the front pillar lower portion 16, and the four nuts 57 penetrating the steering hanger support bracket 58 that contacts the rear surface of the rear wall 16b. The steering hanger support bracket 58 is fixed to the front pillar lower portion 16 by screwing the bolts 59 to the nuts 57 (see FIGS. 6 and 8A). The steering hanger 60 is fixed so as to connect the left and right steering hanger support brackets 58.

  Next, the structure around the floor tunnel 28 and the cross member 29 will be described in detail with reference to FIGS. 3, 4 and 9 to 11.

  In the floor panel portion 12, the outer skin 42 and the inner skin 43 are separated from each other with a predetermined interval, and the core material 44 is sandwiched therebetween. However, the outer skin 42 and the inner skin 43 are overlapped with each other in the portion of the floor tunnel 28 that protrudes upward from the floor panel portion 12. In addition, the outer skin 42 and the inner skin 43 are locally raised and overlapped with each other at a portion below the cross member 29 and along the outer side in the vehicle width direction of the floor tunnel 28. 12a and 12a are formed (see FIGS. 9 and 10). Four nuts 61 are inserted into each recess 12a, and each of the four bolts 63 penetrating through both ends of a steel-made tunnel brace 62F that bridges the lower surface opening of the floor tunnel 28 in the vehicle width direction. Are screwed into the nuts 61, so that the tunnel brace 62F is fixed to the floor panel portion 12. The tunnel brace 62F made of a strip-shaped steel plate is a member having a transverse section bent in a wave shape and is housed in the recesses 12a and 12a of the floor panel portion 12.

  The cross member 29 made of CFRP is a hat-shaped cross-section member having an open lower surface, and includes a front wall 29a, an upper wall 29b, a rear wall 29c, front and rear joining flanges 29d and 29d, and a joining flange 29e on the inner side in the vehicle width direction. The front and rear joining flanges 29d and 29d are connected to the upper surface of the inner skin 43 of the floor panel portion 12, and the joining flange 29e on the inner side in the vehicle width direction is connected to the side wall 28a of the floor tunnel 28 (see FIGS. 9 and 10). When the cross member 29 is fixed to the floor panel portion 12, the recess 12a, the nuts 61, and the bolts 63 of the floor panel portion 12 are covered from the upper side so as not to be visible.

  A rearward inclination angle θ1 with respect to the vertical line of the front wall 29a of the cross member 29 is set to be larger than a forward inclination angle θ2 with respect to the vertical line of the rear wall 29c, and a mounting bracket provided on the front lower surface of the seat 64 The front portion of the seat 64 is fixed to the cross member 29 by screwing the bolts 65, 65 penetrating through 64a into nuts 66, 66 inserted into the front wall 29a (see FIG. 10).

  The rear tunnel brace 62R having the same structure is fixed to the floor tunnel 28 behind the front tunnel brace 62F with the same fixing structure (see FIG. 4). The rear side tunnel brace 62R is provided in the vicinity of the in-vehicle component storage recess 12b formed in the rear portion of the floor panel portion 12 and recessed upward.

  In FIG. 11, the inner skin 43 is removed from the floor panel portion 12 to expose the core members 44 and 44. Each of the left and right core members 44 is a corrugated plate member having a large number of uneven portions 44a, and the uneven portions 44a are lines extending in the vehicle width direction through the middle of the front and rear tunnel braces 62F and 62R. It is formed symmetrically with respect to L. That is, in the front of the line L, the concavo-convex portions 44a are formed concentrically around the front portion of the side sill portion 15, and the concentric circles shift to parallel lines extending in the front-rear direction on the front side of the vehicle body. Similarly, on the rear side of the line L, the concavo-convex parts 44a are formed concentrically around the rear part of the side sill part 15, and the concentric circles shift to parallel lines extending in the front-rear direction on the rear side of the vehicle body. The concentric circles on the front side and the concentric circles on the rear side intersect in a V shape on the line L, and these V shapes expand toward the front side tunnel brace 62F and the rear side tunnel brace 62R.

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

  When the vehicle collides with an offset front, the collision load is input from the front side frame 20 to the front pillar lower portion 16 of the floor 11 via the damper housing 19. At this time, in the internal space from the front pillar lower portion 16 to the front portion of the side sill portion 15, a reinforcing member having a hat-shaped cross section that is formed in an L shape when viewed in the vehicle width direction and opens forward and downward. 52 and the reinforcing member 52 is connected to the front wall 16a and the rear wall 16b of the front pillar lower portion 16 and to the inner upper wall 15b of the side sill portion 15 and the partition plate 51 (FIGS. 5 and 8A). ) To (D)), the front pillar lower portion 16 can efficiently transmit the collision load to the side sill portion 15 without falling backward and can be distributed to the floor panel portion 12. Moreover, since the partition plate 51 can be extended to the front end of the side sill portion 15 without interfering with the reinforcing member 52, the strength of the side sill portion 15 against a collision load of a side collision can be increased.

  Further, the collision load of the offset frontal collision is input from the lower member 27 to the upper portion of the front pillar lower portion 16 via the upper member 26. However, since the reinforcing member 52 faces the rear of the upper member 26, the collision input to the upper member 26 is performed. The load can be effectively transmitted to the side sill portion 15 via the reinforcing member 52.

  Further, the outer edge 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, and the inner edge in the vehicle width direction of the partition plate 51 is connected to the inner wall 15d of the side sill portion 15 (see FIG. 8 (C), (D)), when a collision load of a side collision is input to the side sill 15, the collision load is transmitted from the outer wall 15 e of the side sill 15 through the partition plate 51 and the inner wall 15 d to the floor panel 12. Can be communicated to.

  Further, since a pipe-shaped load transmitting member 56 extending in the front-rear direction is disposed at the boundary between the floor panel portion 12 and the side sill portion 15 (see FIGS. 8C and 8D), the side sill portion 15 has a collision load due to side collision. Can be prevented from falling down with respect to the floor panel portion 12. In addition, since the shock absorbing member 55 that bends in a zigzag manner is disposed in the upper space behind the reinforcing member 52 of the side sill 15 (see FIGS. 5 and 6), the impact of the side collision input to the side sill 15 is impacted. It can be absorbed by the absorbing member 55.

  Further, since the steering hanger support brackets 58 for supporting the steering hanger 60 are fixed with bolts 59 and nuts 57 on both sides in the vehicle width direction of the connecting portion with the reinforcing member 52 on the rear wall 16b of the front pillar lower portion 16. The steering hanger 60 can be firmly fixed to the front pillar lower portion 16 (see FIG. 8A).

  An inner bulkhead 53 extending in the horizontal direction is disposed between the inner wall 15d of the side sill portion 15 and the reinforcing member 52, and an outer bulkhead extending in the horizontal direction is disposed between the outer wall 15e of the side sill portion 15 and the reinforcing member 52. 54, and the inner bulkhead 53 and the outer bulkhead 54 connect the front wall 16a of the front pillar lower portion 16 to the inner upper wall 15b and the outer upper wall 15c of the side sill portion 15 (FIG. 8C). (See (D)), the collision load of the frontal collision can be transmitted from the front pillar lower portion 16 to the side sill portion 15 via the inner bulkhead 53 and the outer bulkhead 54.

  Further, the outer skin 42 and the inner skin 43 are directly overlapped on both sides in the vehicle width direction of the portion where the floor tunnel 28 protrudes upward from the floor panel portion 12 of the floor 11, and are fitted into the recesses 12a and 12a formed in the overlapping portion. Since the tunnel braces 62F and 62R are accommodated and both ends of the tunnel braces 62F and 62R in the vehicle width direction are fastened to the recesses 12a and 12a with bolts 63 and nuts 61 (see FIG. 10), the tunnel braces 62F and 62R is prevented from projecting downward from the floor panel portion 12 to ensure the minimum ground clearance of the vehicle body, and the tunnel braces 62F and 62R are brought closer to the center of the floor panel portion 12 in the thickness direction so that the collision load of the side collision is reduced. When input to the floor panel unit 12, the collision load is transferred to the tunnel brace 62F, Effectively supported by 2R can prevent collapse of the floor tunnel 28.

  Further, since the tunnel braces 62F and 62R are plate members which are bent in a waveform when viewed in the vehicle width direction (see FIG. 10), the strength of the tunnel braces 62F and 62R against the collision load of the side collision can be increased. Moreover, in the recesses 12a and 12a to which the tunnel braces 62F and 62R are fastened, not only the lower outer skin 42 protrudes upward, but the upper inner skin 43 also protrudes upward, and accordingly, the recesses 12a and 12a. By increasing the depth, the thickness of the tunnel braces 62F and 62R in the vertical direction can be increased, and the strength against the collision load of the side collision can be increased.

  Since the upper surfaces of the recesses 12a and 12a to which the front tunnel brace 62F is fastened are covered with the cross member 29 (see FIG. 10), the inner skin 43 is raised upward to form the recesses 12a and 12a. Not only can the space of the passenger compartment be reduced, but the load input to the recesses 12a, 12a can be dispersed and absorbed by the cross member 29. Moreover, the cross member 29 is a CFRP member having a front wall 29a, an upper wall 29b, and a rear wall 29c and having an open lower surface. The front wall has an inclination angle θa with respect to the vertical direction larger than the inclination angle θb of the rear wall 29c. Since the nut 66 for fastening the seat 64 is inserted into the seat 29a, not only the area of the front wall 29a is increased and the seat 64 is easily attached, but also the strength of the front wall 29a against the collision load in the front-rear direction is increased. be able to.

  Further, since the rear side tunnel brace 62R is arranged in the vicinity of the in-vehicle component storage recess 12b formed in the rear portion of the floor panel portion 12 (see FIG. 4), the floor panel whose strength is reduced by forming the in-vehicle component storage recess 12b. The portion 12 can be reinforced with the rear tunnel brace 62R.

  Further, the core material 44 of the floor panel portion 12 is made of a CFRP corrugated plate having a number of uneven portions 44a extending in a ripple shape, and the uneven portions 44a are intermediate between the front and rear tunnel braces 62F and 62R in the front-rear direction. Since it has a vertex on a line L that extends in the vehicle width direction through the position and expands toward the front and rear tunnel braces 62F and 62R (see FIG. 11), one side of the floor panel portion 12 in the vehicle width direction Is transmitted to the front and rear tunnel braces 62F and 62R through the concave and convex portions 44a of the core material 44 on one side in the vehicle width direction, and from there to the core on the other side in the vehicle width direction. By transmitting to the material 44, the collision load of a side collision can be disperse | distributed and absorbed to the whole floor panel part 12. FIG.

  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.

  In the embodiment, the two tunnel braces 62F and 62R are provided, but the number of tunnel braces is not limited to two.

  The seat fastening seat of the present invention is not limited to the nuts 66 and 66 of the embodiment.

12 Floor panel part 12a Recessed part (tunnel brace fastening seat)
12b In-vehicle component storage recess 15 Side sill 28 Floor tunnel 29 Cross member 29a Front wall 29c Rear wall 42 Outer skin 43 Inner skin 44 Core material 44a Uneven portion 56 Load transmitting member 62F Front tunnel brace 62R Rear tunnel brace 64 Sheet 66 Nut (seat fastening seat)

Claims (8)

An opening opening downward in the center in the vehicle width direction of the floor panel portion (12) made of fiber reinforced resin with the core material (44) sandwiched between the lower outer skin (42) and the upper inner skin (43) A floor tunnel (28) extending in the front-rear direction, and an opening of the floor tunnel (28) bridged by tunnel braces (62F, 62R) extending in the vehicle width direction,
The outer skin (42) rises upward at the portion where the floor panel portion (12) continues to the floor tunnel (28) and is superimposed on the lower surface of the inner skin (43), and the outer skin (42) and A floor structure of an automobile, wherein a tunnel brace fastening seat (12a) for fastening the tunnel brace (62F, 62R) is formed on the overlapping portion of the inner skin (43).   The automobile floor structure according to claim 1, wherein the tunnel brace (62F, 62R) is a plate material bent in a waveform when viewed in the vehicle width direction.   The floor structure of an automobile according to claim 1 or 2, wherein the inner skin (43) protrudes upward in the tunnel brace fastening seat (12a).   The automobile according to any one of claims 1 to 3, wherein the tunnel brace fastening seat (12a) is covered by a cross member (29) coupled to the upper surface of the inner skin (43). Floor structure.   The cross member (29) is a fiber reinforced resin member having a front wall (29a) and a rear wall (29c) and having an open lower surface, and an inclination angle with respect to a vertical direction is an inclination angle of the rear wall (29c). The vehicle floor structure according to claim 4, wherein a seat fastening seat (66) for fastening the seat (64) is formed on the front wall (29a) larger than the front wall (29a).   A pipe-shaped load transmission member (56) extending in the front-rear direction is disposed at a boundary between the floor panel portion (12) and a side sill portion (15) provided continuously outside the vehicle width direction. The automobile floor structure according to any one of claims 1 to 5.   The front and rear tunnel braces (62F, 62R) are provided, and the rear tunnel brace (62R) is disposed in the vicinity of the in-vehicle component storage recess (12b) formed in the rear portion of the floor panel portion (12). The automobile floor structure according to any one of claims 1 to 6, wherein   The core material (44) is made of a fiber reinforced resin corrugated plate having a number of irregularities (44a) extending in a ripple pattern, and the irregularities (44a) are formed on the front and rear tunnel braces (62). 8. It has a vertex on a line extending in the vehicle width direction through an intermediate position in the front-rear direction, and widens toward the front and rear tunnel braces (62 F, 62 R). Car floor structure.

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