JP2015063207A - Body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance strength of a floor panel against a collision load to be inputted to a side sill at a side collision.SOLUTION: A first connecting flange 24c, continued to a tip end side of a first corner portion 24b in which an outer end in a vehicle width direction of an outer skin 24 of a floor panel 12 made of FRP is curved upward, and a second connecting flange 25c, continued to the tip end side of a second corner portion 25b in which an outer end in the vehicle width direction of an inner skin 25 is curved upward, are overlapped and connected to each other; an outer surface in the vehicle width direction of the first connecting flange 24c is connected to an inner wall 21a in the vehicle width direction of a side sill 13 and a space formed between the outer surface in a curving direction of the second corner portion 25b and the inner surface in the vehicle width direction of the first connecting flange 24c is filled with non-continuous fiber-reinforced resin 27. This allows the second corner portion 25b to be effectively reinforced with a non-continuous fiber-reinforced resin 27 so as to suppress interlayer peeling of the FRP and allow the strength of the floor panel 12 to be enhanced against a collision load to be inputted to the side sill 13 at a side collision.

Description

  The present invention relates to a vehicle body structure for an automobile in which an outer end in a vehicle width direction of a floor panel made of FRP with a core material sandwiched between a first skin and a second skin is connected to an inner wall in the vehicle width direction of a side sill made of FRP.

  A car body with a floor panel, rocker (side sill), front pillar lower, dash panel lower, rear pillar, etc. is molded integrally with CFRP, and a wave-shaped energy absorbing member is placed inside the side sill, allowing input to the side sill. A device that absorbs a collision load of a side collision is known from Patent Document 1 below.

Japanese Patent No. 4840072

  By the way, in the above-mentioned conventional one, the floor panel and the side sill are configured as separate members, and a pair of flange portions in which the outer edges in the vehicle width direction of the outer skin and inner skin of the floor panel are curved upward at the corner portions are mutually connected. And the floor panel and the side sill are integrally connected by connecting the outer surface in the vehicle width direction of the overlapped flange portion to the inner wall in the vehicle width direction of the side sill.

  However, in the above structure, when the collision load of the side collision input to the side sill is transmitted to the outer edge in the vehicle width direction of the floor panel, the load concentrates on the corner part of the outer skin and inner skin of the floor panel. When the continuous fiber layer of CFRP is delaminated and broken, there is a possibility that the collision load is efficiently dispersed on the floor panel and cannot be absorbed.

  The present invention has been made in view of the above circumstances, and an object thereof is to increase the strength of a floor panel against a collision load of a side collision input to a side sill.

  In order to achieve the above object, according to the invention described in claim 1, the outer end in the vehicle width direction of the floor panel made of FRP in which the core material is sandwiched between the first skin and the second skin is connected to the side sill made of FRP. A vehicle body structure connected to an inner wall in the vehicle width direction of the vehicle, wherein the first joint flange is connected to the front end side of the first corner portion in which the vehicle width direction outer end of the first skin is curved in the vertical direction; An outer surface in the vehicle width direction of the first joint flange is overlapped with and connected to the second joint flange connected to the tip end side of the second corner portion in which the outer end in the vehicle width direction of the second skin is bent in the vertical direction. Is connected to the inner wall in the vehicle width direction of the side sill, and the space formed between the outer surface in the vehicle width direction of the second corner portion and the inner surface in the vehicle width direction of the first joint flange, and the outer surface in the curve direction of the first corner portion And said Of the vehicle width direction inner wall formed between space idosyl, vehicle body structure, characterized in that it fills at least one discontinuous fiber reinforced resin part is proposed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the first skin located on the lower side of the floor panel and the second skin located on the upper side are curved upward. The first and second corner portions are formed, and the space formed between the curved outer surface of the second corner portion and the inner surface of the first joint flange in the vehicle width direction is filled with the discontinuous fiber reinforced resin portion. A vehicle body structure characterized by the above is proposed.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the inner surface in the bending direction of the first corner portion is filled with the second discontinuous fiber reinforced resin portion, and the first contact portion is in contact with each other. A vehicle body structure is proposed in which an uneven engagement portion is provided between the lower surface of the continuous fiber reinforced resin portion and the upper surface of the second discontinuous fiber reinforced resin portion.

  According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, the inner surface in the bending direction of the first corner portion is filled with the second discontinuous fiber reinforced resin portion, and the first contact portion is in contact with each other. A vehicle body structure is proposed in which the lower surface of the continuous fiber reinforced resin portion and the upper surface of the second discontinuous fiber reinforced resin portion are fastened by fastening means.

  According to the invention described in claim 5, in addition to the configuration of any one of claims 1 to 4, the energy absorbing member is disposed inside the side sill formed in a closed cross section. A featured vehicle body structure is proposed.

  The outer skin 24 of the embodiment corresponds to the first skin of the present invention, the inner skin 25 of the embodiment corresponds to the second skin of the present invention, and the concave portion 27a and the convex portion 29a of the embodiment are the present skin. Corresponding to the concavo-convex engaging portion of the invention, the nut 30 and the bolt 31 of the embodiment correspond to the fastening means of the present invention.

  According to the configuration of claim 1, in the portion of connecting the outer end in the vehicle width direction of the floor panel made of FRP with the core material sandwiched between the first skin and the second skin to the inner wall in the vehicle width direction of the side sill made of FRP, A first joint flange connected to the front end side of the first corner portion in which the outer end in the vehicle width direction of the first skin is curved in one up and down direction, and a first joint flange in which the outer end in the vehicle width direction of the second skin is curved in one up and down direction. A second joint flange connected to the front end side of the two corner portions is overlapped and connected to each other, and the outer surface in the vehicle width direction of the first joint flange is connected to the inner wall in the vehicle width direction of the side sill. At this time, the space formed between the curved direction outer surface of the second corner portion and the inner surface in the vehicle width direction of the first joint flange, and the space formed between the curved direction outer surface of the first corner portion and the inner width wall of the side sill. Since at least one of them is filled with the discontinuous fiber reinforced resin part, the connecting part of the floor panel and the side sill is effectively reinforced with the discontinuous fiber reinforced resin part, and the FRP of the first corner part or the second corner part The delamination of the floor panel can be suppressed, and the strength of the floor panel against the collision load of the side collision input to the side sill can be increased.

  According to the configuration of claim 2, the first skin located on the lower side of the floor panel and the second skin located on the upper side are curved upward to form the first and second corner portions, and the second corner portion is formed. Since the space formed between the outer surface in the curve direction and the inner surface in the vehicle width direction of the first joint flange is filled with the discontinuous fiber reinforced resin part, it is easy to raise the side sill upward from the outer end in the vehicle width direction of the floor panel In addition, since the discontinuous fiber reinforced resin portion is provided only on the outer surface in the bending direction of the second corner portion, the structure is simplified.

  According to the configuration of claim 3, the inner surface in the bending direction of the first corner portion is filled with the second discontinuous fiber reinforced resin portion, and the lower surface of the discontinuous fiber reinforced resin portion and the second discontinuous fiber that are in contact with each other. Since the concavo-convex engaging part is provided between the upper surfaces of the reinforced resin part, the rigidity of the connecting part of the floor panel and the side sill is further enhanced by the discontinuous fiber reinforced resin part and the second discontinuous fiber reinforced resin part. The load input to the side sill at the time of a collision or traveling on a rough road can be efficiently distributed to the floor panel, and the thickness of the floor panel can be reduced to reduce the weight.

  According to the configuration of claim 4, the inner surface in the bending direction of the first corner portion is filled with the second discontinuous fiber reinforced resin portion, and the lower surface of the discontinuous fiber reinforced resin portion and the second discontinuous fibers that are in contact with each other. Since the upper surface of the reinforced resin portion is fastened by the fastening means, the rigidity of the connecting portion of the floor panel and the side sill is further enhanced by the discontinuous fiber reinforced resin portion and the second discontinuous fiber reinforced resin portion, so that at the time of a side collision or The load input to the side sill when traveling on a rough road can be efficiently distributed to the floor panel, and the thickness of the floor panel can be reduced to reduce the weight.

  According to the fifth aspect of the present invention, since the energy absorbing member is arranged inside the side sill formed in the closed cross section, the energy absorbing member absorbs the collision energy of the side collision input to the side sill, so that the floor is separated from the side sill. The load transmitted to the panel can be reduced, and the floor panel can be further reduced in weight.

The top view of the automobile body made from CFRP. (First embodiment) FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. (First embodiment) The figure corresponding to FIG. (Second Embodiment) The figure corresponding to FIG. (Third embodiment) The figure corresponding to FIG. (Fourth embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to an occupant seated in the driver's seat.

  As shown in FIGS. 1 and 2, a bathtub-like cabin 11 integrally formed of CFRP (carbon fiber reinforced resin) includes a floor panel 12 and left and right sides extending in the front-rear direction along the left and right sides of the floor panel 12. A pair of side sills 13, 13, a pair of left and right front pillar lowers 14, 14 rising from the front ends of the left and right side sills 13, 13, and a dash connecting the front end of the floor panel 12 and the front ends of the left and right front pillar lowers 14, 14. A panel lower 15 and a floor tunnel 16 extending rearward from the rear surface of the dash panel lower 15 in the center in the vehicle width direction of the floor panel 12 are provided.

  The side sill 13 includes an inner skin 21 positioned on the inner side in the vehicle width direction, an outer skin 22 positioned on the outer side in the vehicle width direction, and an energy absorbing member 23 made of a honeycomb material disposed between the inner skin 21 and the outer skin 22. . The inner skin 21 and the outer skin 22 of the side sill 13 are made of CFRP obtained by laminating a plurality of layers of carbon continuous fibers aligned in one direction and solidifying them with a resin.

  The inner skin 21 has a flat vehicle width direction inner wall 21a, an upper joint flange 21b extending upward from the upper end of the vehicle width direction inner wall 21a, and a lower end of the vehicle width direction inner wall 21a curved approximately 90 ° inward in the vehicle width direction. The outer skin 22 includes an upper wall 22a, a vehicle width direction outer wall 22b, and a lower wall 22c that are formed in a U-shape, and includes a corner portion 21c and a lower joint flange 21d that extends inward in the vehicle width direction from the corner portion 21c. The upper joint flange 22d extends upward from the inner end in the vehicle width direction of the upper wall, and the lower joint flange 22e extends the inner end in the vehicle width direction of the lower wall 22c inward in the vehicle width direction.

  The upper side flanges 21b and 22d of the inner skin 21 and the outer skin 22 are connected to each other by bonding, and the lower side bonding flanges 21d and 22e of the inner skin 21 and the outer skin 22 are connected to each other by bonding so that the side sill 13 has a hollow closed cross section. The energy absorbing member 23 made of a honeycomb material in which a plurality of vertical ribs 23a and a plurality of horizontal ribs 23b intersect with each other has an axis line in the vehicle width direction and the inner wall 21a in the vehicle width direction of the inner skin 21 and The outer skin 22 is connected to the outer wall 22b in the vehicle width direction by adhesion.

  The floor panel 12 is a corrugated plate sandwiched between an outer skin 24 constituting the outer surface (lower surface) of the vehicle body, an inner skin 25 constituting the inner surface (upper surface) of the vehicle body, and the outer skin 24 and the inner skin 25 of the floor panel 12. Core material 26. The outer skin 24 and the inner skin 25 are made of CFRP in which a sheet in which carbon continuous fibers are aligned in one direction is laminated in a plurality of layers and hardened with a resin.

  The outer skin 24 includes a first corner portion 24b in which the outer end in the vehicle width direction of the flat plate-shaped main body portion 24a is curved upward by approximately 90 °, and a first joint flange 24c extending upward from the first corner portion 24b. The inner skin 25 includes a second corner portion 25b in which the outer end in the vehicle width direction of the flat plate-like main body portion 25a is curved approximately 90 ° upward, and a second joint flange 25c extending upward from the second corner portion 25b. .

  The first joint flange 24c of the outer skin 24 and the second joint flange 25c of the inner skin 25 are overlapped and connected by adhesion, and the inner surface in the vehicle width direction of the first joint flange 24c of the outer skin 24 and the inner skin 25 A space having a triangular cross-section sandwiched between the curved outer surfaces of the two corner portions 25b is filled with a discontinuous fiber reinforced resin portion 27 obtained by solidifying carbon discontinuous fibers with a thermosetting resin. Then, the outer end in the vehicle width direction of the main body 24a of the outer skin 24, the first corner 24b and the first connecting flange 24c are connected to the lower connecting flange 21d, the corner 21c and the inner wall 21a in the vehicle width direction of the inner skin 21 of the side sill 13. The side sill 13 is connected to the outer end of the floor panel 12 in the vehicle width direction.

  Now, a part of the collision load of the side collision input to the side sill 13 is absorbed by the crushing of the energy absorbing member 23 disposed between the outer skin 22 and the inner skin 21, and the remaining part is dispersed from the side sill 13 to the floor panel 12. Absorbed. At this time, the side sill 13 is at a higher position than the floor panel 12, and a moment is applied to cause the upper part of the side sill 13 to fall inward in the vehicle width direction due to the collision load of the side collision. A large bending load is input to the first corner portion 24 b and the second corner portion 25 b of the inner skin 25.

  The outer end in the vehicle width direction of the main body portion 24a of the outer skin 24, the first corner portion 24b, and the first joint flange 24c have a large area, and the lower joint flange 21d, the corner portion 21c, and the inner wall in the vehicle width direction of the inner skin 21 of the side sill 13. Since it is connected to the lower part of 21a, the outer skin 24 of the floor panel 12 is firmly connected to the inner skin 21 of the side sill 13.

  On the other hand, the inner skin 25 of the floor panel 12 is connected to the first joint flange 24c of the outer skin 24 only by the second joint flange 25c. There is a possibility that a large bending load acts on 25b, the continuous fiber layer of the second corner portion 25b is delaminated and destroyed, and the side sill 13 falls down in the vehicle width direction.

  However. According to the present embodiment, a space having a triangular cross section sandwiched between the inner surface in the vehicle width direction of the first joint flange 24c of the outer skin 24 of the floor panel 12 and the outer surface in the curved direction of the second corner portion 25b of the inner skin 25. Is filled with the discontinuous fiber reinforced resin portion 27, the delamination of the continuous fiber layer of the second corner portion 25b is prevented, and the strength of the second corner portion 25b against the bending load is increased. Thereby, it is possible to prevent the side sill 13 from falling down while minimizing an increase in the weight of the floor panel 12 without applying special reinforcement to the floor panel 12.

Second embodiment

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

  The side sill 13 of the second embodiment includes a lower joint flange 21e that extends straight downward from the inner wall 21a of the inner skin 21 and a lower joint that extends downward from the inner end of the lower wall 22c of the outer skin 22 in the vehicle width direction. The flange 22f is connected by adhesion, and the first joining flange 24c of the outer skin 24 of the floor panel 12 is connected to the vehicle width direction inner wall 21a of the inner skin 21 of the side sill 13 by adhesion. A space having a triangular cross section formed between the curved outer surface of the first corner portion 24b of the outer skin 24 of the floor panel 12 and the inner surface 21a of the inner skin 21 of the side sill 13 in the vehicle width direction is a carbon. The discontinuous fibers are filled with a discontinuous fiber reinforced resin portion 28 made of thermosetting resin.

  According to the present embodiment, not only the second corner portion 25b of the inner skin 25 of the floor panel 12 is reinforced by the discontinuous fiber reinforced resin portion 27 but also the first corner portion 24b of the outer skin 24 of the floor panel 12. Is also reinforced by the discontinuous fiber reinforced resin portion 28, so that the delamination of the continuous fiber layer of the first corner portion 24b is suppressed, and the strength of the floor panel 12 against the collision load of the side collision input to the side sill 13 is further increased. Can do.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG.

  The third embodiment is a modification of the first embodiment, and the outer surface in the curve direction of the second corner portion 25b of the inner skin 25 of the floor panel 12 and the inner surface in the vehicle width direction of the second joint flange 24c of the outer skin 24 are shown. The discontinuous fiber reinforced resin portion 27 that fills the space between them is extended downward to increase the size, and the second discontinuous fiber reinforced resin portion 29 is provided on the inner surface in the curved direction of the first corner portion 24b of the outer skin 24. It is done. The flat lower surface of the discontinuous fiber reinforced resin portion 27 and the flat upper surface of the second discontinuous fiber reinforced resin portion 29 are in contact with each other, and a convex portion 29a provided on one of them is a concave portion 27a provided on the other. And fixed by adhesion.

  According to the present embodiment, the outer skin 24 and the inner skin 25 are connected to each other by the discontinuous fiber reinforced resin portion 27 and the second discontinuous fiber reinforced resin portion 29 at the outer end of the floor panel 12 in the vehicle width direction. In addition, since the discontinuous fiber reinforced resin portion 27 and the second discontinuous fiber reinforced resin portion 29 are fixed by bonding with the convex portions 29a and the concave portions 27a and fixed by adhesion, the connecting portion of the floor panel 12 and the side sill 13 It is possible to further increase the strength of the floor panel 12 so that the load input to the side sill 13 can be efficiently distributed to the floor panel 12 at the time of a side collision or a rough road, reducing the thickness of the floor panel 12 and reducing the weight. Can be planned.

Fourth embodiment

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  The fourth embodiment is a modification of the third embodiment, in which a bolt 31 penetrating the second discontinuous fiber reinforced resin portion 29 is screwed into a nut 30 embedded in the discontinuous fiber reinforced resin portion 27. Thus, the discontinuous fiber reinforced resin portion 27 and the second discontinuous fiber reinforced resin portion 29 are integrally coupled.

  Also according to the fourth embodiment, it is possible to achieve the same operational effects as those of the third embodiment described above.

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

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

  Further, the discontinuous fiber reinforced resin portion 27 on the radially outer side of the second corner portion 25b of the inner skin 25 of the floor panel 12, and the discontinuous fiber reinforced resin portion 28 on the outer side of the curved direction of the first corner portion 24b of the outer skin 24, Of these, only the latter continuous fiber reinforced resin portion 28 may be provided.

12 Floor panel 13 Side sill 21a Inner wall 23 in the vehicle width direction Energy absorbing member 24 Outer skin (first skin)
24b First corner portion 24c First joint flange 25 Inner skin (second skin)
25b 2nd corner part 25c 2nd joining flange 26 Core material 27 Discontinuous fiber reinforced resin part 27a Concave part (concave-engagement part)
28 Discontinuous fiber reinforced resin part 29 2nd discontinuous fiber reinforced resin part 29a Convex part (concave-engagement part)
30 Nut (fastening means)
31 bolts (fastening means)

Claims (5)

The vehicle width direction outer end of the FRP floor panel (12) sandwiching the core material (26) between the first skin (24) and the second skin (25) is the inner wall of the FRP side sill (13) in the vehicle width direction. (21a) a vehicle body structure connected to the vehicle,
The first skin (24) has a first joint flange (24c) connected to the front end side of the first corner portion (24b) in which the outer end in the vehicle width direction is curved in the vertical direction, and the second skin (25). The first joint flange (24c) is overlapped with and connected to the second joint flange (25c) connected to the front end side of the second corner portion (25b) whose outer end in the vehicle width direction is curved in the vertical direction. The outer surface in the vehicle width direction is connected to the inner wall (21a) in the vehicle width direction of the side sill (13). At least one of the space formed between the space formed between the curved outer surface of the first corner portion (24b) and the inner wall (21a) of the side sill (13) in the vehicle width direction is a discontinuous fiber. strength Body structure of a motor vehicle, characterized in that filled with a resin portion (27, 28).   The first and second corner portions (24b, 25b) are formed by curving the first skin (24) located below the floor panel (12) and the second skin (25) located above the floor panel (12) upward. The space formed between the curved outer surface of the second corner portion (25b) and the inner surface of the first joint flange (24c) in the vehicle width direction is filled with the discontinuous fiber reinforced resin portion (27). The vehicle body structure of an automobile according to claim 1.   The inner surface in the bending direction of the first corner portion (24b) is filled with the second discontinuous fiber reinforced resin portion (29), and the lower surface of the discontinuous fiber reinforced resin portion (27) that is in contact with each other and the second non-continuous fiber portion. The vehicle body structure of an automobile according to claim 2, characterized in that an uneven engagement portion (27a, 29a) is provided between the upper surfaces of the continuous fiber reinforced resin portion (29).   The inner surface in the bending direction of the first corner portion (24b) is filled with the second discontinuous fiber reinforced resin portion (29), and the lower surface of the discontinuous fiber reinforced resin portion (27) that is in contact with each other and the second non-continuous fiber portion. The vehicle body structure according to claim 2, wherein the upper surface of the continuous fiber reinforced resin portion (29) is fastened by fastening means (30, 31).   The vehicle body structure according to any one of claims 1 to 4, wherein an energy absorbing member (23) is arranged inside the side sill (13) formed in a closed cross section.

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