JP5988168B2 - Auto body structure - Google Patents

Description

  In the present invention, the dash panel lower standing from the front end of the floor panel has a plate-like shape sandwiched between the outer skin and the inner skin, and an outer skin and an inner skin in which a plurality of continuous fiber layers are laminated and hardened with a resin. The present invention relates to a vehicle body structure that includes an insert member and fastens a front side frame that abuts against a front surface of the dash panel lower to the insert member with a bolt.

  In order to fix the front side frame to the front of the dash panel lower of the car body made of CFRP, a metal collar having an internal thread was embedded between the dash front panel and the dash rear panel of the dash panel lower and provided at the rear end of the front side frame. Patent Document 1 below discloses that a bolt that penetrates the flange portion from the front to the rear is screwed into a metal collar and fastened.

Japanese Patent No. 4853180

  By the way, in the above conventional one, since the collision load of the frontal collision input to the front side frame is transmitted to the small metal collar, a large load acts on the CFRP dash panel lower around the metal collar, and the dash There was a possibility that the continuous fiber layers of the front panel (outer skin) and the dash rear panel (inner skin) would be delaminated and the dash panel lower could be destroyed.

  In order to prevent this, a large plate-like insert member is embedded in the dash panel lower instead of a small metal collar, and the front side frame is fastened to the female screw formed on this insert member, thereby inserting the collision load. It is possible to disperse and absorb from a member to a wide range of the dash panel lower.

  However, when the dash panel lower has a corner portion in the vicinity of the insert member, a strong bending load concentrates on the outer skin and inner skin of the corner portion, so that the continuous fiber layer is delaminated and the strength of the dash panel lower 15 is increased. May be reduced.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to increase the strength of a dash panel lower that receives a collision load from a front side frame.

  In order to achieve the above object, according to the invention described in claim 1, an outer skin and an inner skin in which a dash panel lower standing from a front end of a floor panel is laminated with a plurality of continuous fiber layers and hardened with a resin. And a plate-like insert member sandwiched between the outer skin and the inner skin, and a vehicle body structure for an automobile in which a front side frame that contacts the front surface of the dash panel lower is fastened to the insert member with a bolt. The dash panel lower includes a vertical wall portion extending in the vertical direction, and an inclined wall portion extending rearward and downward from the lower end of the vertical wall portion and connected to the front end of the floor panel, and the insert member includes the vertical wall A main body having a female screw positioned in the wall and screwed into the bolt; and extending from the lower end of the main body into the inclined wall. Body structure of a motor vehicle, characterized in that it comprises a lower extension portion is proposed.

  According to the invention described in claim 2, in addition to the structure of claim 1, the insert member has a plate thickness in the inclined wall portion larger than a plate thickness in the vertical wall portion. A vehicle body structure is proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, a wheel arch is continuous on the vehicle width direction outer side of the vertical wall portion, and the insert member is the wheel. A vehicle body structure is proposed which is arranged at a position adjacent to an arch.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the insert member includes a lateral extension extending from the main body into the wheel arch. A structure is proposed.

  According to the invention described in claim 5, in addition to the configuration of any one of claims 1 to 4, the vertical wall portion is a first sandwiched between the outer skin and the inner skin. There is proposed a vehicle body structure including a core material, wherein the first core material has a corrugated plate shape having a number of beads extending in a vehicle width direction and continuing to a front end of a floor tunnel.

  According to the invention described in claim 6, in addition to the configuration of any one of claims 1 to 5, the inclined wall portion is a second sandwiched between the outer skin and the inner skin. There is proposed a vehicle body structure including a core material, wherein the second core material has a corrugated shape having a number of beads extending in the front-rear direction.

  According to the invention described in claim 7, in addition to the structure of any one of claims 1 to 6, the insert member is a discontinuous fiber reinforced resin member in which a nut having the female screw is embedded. A vehicle body structure characterized by the above is proposed.

  According to the configuration of claim 1, the dash panel lower standing from the front end of the floor panel is sandwiched between the outer skin and the inner skin, and the outer skin and the inner skin laminated with a plurality of continuous fiber layers and solidified with resin. A front side frame that includes a plate-like insert member and abuts against the front surface of the dash panel lower is fastened to the insert member with a bolt.

  The dash panel lower includes a vertical wall portion that extends in the vertical direction, and an inclined wall portion that extends rearward and downward from the lower end of the vertical wall portion and connects to the front end of the floor panel, and the insert member is located in the vertical wall portion. Since it has a main body part having a female screw with which a bolt is screwed and a lower extension part extending into the inclined wall part from the lower end of the main body part, it is possible to prevent a frontal collision input from the front side frame to the insert member in the vertical wall part of the dash panel lower. When a collision load is transmitted to the inclined wall, even if a large bending load is applied to the outer skin and inner skin at the corner between the vertical wall and the inclined wall, the portion is reinforced by the lower extension of the insert member. Thus, occurrence of delamination in the continuous fiber layer is suppressed. Thereby, the intensity | strength of the dash panel lower with respect to the collision load of a front collision can be raised, without increasing the board thickness of an outer skin and an inner skin.

  Further, according to the configuration of the second aspect, since the thickness of the inclined wall portion of the insert member is larger than that of the vertical wall portion, the outer skin and the inner skin of the inclined wall portion are more effectively reinforced. be able to.

  According to the configuration of the third aspect, the wheel arch is continuous to the vehicle width direction outside of the vertical wall portion, and the insert member is disposed at a position adjacent to the wheel arch. The collision load of the frontal collision input to the vertical wall can be transmitted to the wheel arch and absorbed.

  Further, according to the configuration of claim 4, since the insert member includes the side extension portion extending from the main body portion into the wheel arch, the continuous fiber layers of the outer panel and the inner panel in the corner portion where the vertical wall portion continues to the wheel arch. By suppressing the delamination, it is possible to secure the strength of the dash panel lower while reducing the thickness of the outer panel and the inner panel and reducing the weight.

  According to the fifth aspect of the present invention, the vertical wall portion includes the first core material sandwiched between the outer skin and the inner skin, and the first core material extends in the vehicle width direction and continues to the front end of the floor tunnel. Because of the corrugated plate shape having a bead, the collision load of the frontal collision input from the front side frame to the vertical wall portion of the dash panel lower is efficiently transmitted to the floor tunnel through the first core material and absorbed. be able to.

  According to the configuration of claim 6, the inclined wall portion includes the second core member sandwiched between the outer skin and the inner skin, and the second core member has a corrugated shape having a number of beads extending in the front-rear direction. Therefore, the collision load of the frontal collision input from the front side frame to the vertical wall portion of the dash panel lower can be efficiently transmitted and absorbed to the floor panel via the second core material of the inclined wall portion.

  According to the structure of claim 7, the insert member is a discontinuous fiber reinforced resin member in which a nut having a female screw is embedded, so that the front side frame can be firmly fixed to the dash panel lower with a bolt. The weight can be reduced as compared with the case where the entire insert member is made of metal.

The perspective view of the front part of the automobile body made from CFRP. (First embodiment) FIG. (First embodiment) FIG. 3 is a three-direction arrow view of FIG. 1. (First embodiment) FIG. 4 is a sectional view taken along line 4-4 of FIG. (First embodiment) The figure corresponding to FIG. (Second Embodiment)

First embodiment

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

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

  A pair of left and right aluminum cast front side frames 17, 17 are fixed to the front surface of the dash panel lower 15, and front damper housings 18, 18 are integrally formed on the front side frames 17, 17. A pair of left and right CFRP upper members 19, 19 extends forward from the upper ends of the left and right front pillar lowers 14, 14, and the upper ends of the front damper housings 18, 18 are connected to the inner surfaces of the upper members 19, 19 in the vehicle width direction. Is done.

  As shown in FIGS. 1 to 4, the cabin 11 is formed by connecting an outer skin 21 located on the outer side of the vehicle body and an inner skin 22 located on the inner side of the vehicle body with joint flanges 21 a and 22 a formed around the outer skin 21. The skin 21 and the inner skin 22 are made of CFRP in which a plurality of carbon continuous fiber layers are laminated and hardened with a resin. The dash panel lower 15 includes an upper vertical wall portion 23 standing upright in the vertical direction, and an inclined wall portion 24 extending obliquely rearward and downward from the lower end of the vertical wall portion 23, and the rear end of the inclined wall portion 24 is horizontal. Connected to the front end of the floor panel 12.

  The dash panel lower 15 and the floor panel 12 include first to third core members 25, 26 and 27 made of CFRP sandwiched between the outer skin 21 and the inner skin 22. The first core member 25 of the vertical wall portion 23 of the dash panel lower 15 is disposed with the wavy bead directed in the vehicle width direction, and the inclined wall portion 24 of the dash panel lower 15 and the second and third cores of the floor panel 12 are arranged. The materials 26 and 27 are arranged with the wavy beads directed in the front-rear direction. The inner end in the vehicle width direction of the first core member 25 of the vertical wall portion 23 is connected to the floor tunnel 16 located at the center in the vehicle width direction of the floor panel 12.

  The interior of the side sill 13 is partitioned into an upper space and a lower space by a partition wall 28 extending horizontally in the front-rear direction, and an upper energy absorbing member 29 that is bent in a zigzag manner in a side view is disposed in the upper space, and in a lower space in a side view. A lower energy absorbing member 30 bent in a zigzag is arranged.

  A pair of left and right insert members 31, 31 made of a metal plate are embedded in the dash panel lower 15. The insert member 31 is basically disposed so as to be sandwiched between the outer skin 21 and the inner skin 22 of the dash panel lower 15, and protrudes rearward and downward from the flat plate-like main body portion 31a and the lower end of the main body portion 31a. A downward extension 31b and a lateral extension 31c projecting outward in the vehicle width direction and rearward from the outer end in the vehicle width direction of the main body 31a are provided. In the portion where the insert member 31 is located, the first and second core members 25 and 26 are cut out so as not to interfere with the insert member 31.

  The body portion 31a is formed with three cutout holes 31d and six female screws 31e, and has six bolt holes 17b formed in a mounting flange 17a provided at the rear end of the front side frame 17. The front side frame 17 is fastened to the front surface of the vertical wall portion 23 of the dash panel lower 15 by screwing the six bolts 32 penetrating from the front to the rear with the six female screws 31e.

  The downward extension 31 b of the insert member 31 is sandwiched between the outer skin 21 and the inner skin 22 at the front end of the inclined wall portion 24 of the dash panel lower 15. Therefore, the insert member 31 is disposed so as to straddle the corner portion between the main body portion 31 a of the dash panel lower 15 and the inclined wall portion 24. The plate thickness t1 of the downward extension 31b of the insert member 31 is set to be larger than the plate thickness t2 of the main body 31a (see FIG. 4).

  The front pillar lower 14 includes a wheel arch 14 a that is continuous to the outer side in the vehicle width direction of the vertical wall portion 23 of the dash panel lower 15. The side extension 31c of the insert member 31 is sandwiched between the outer skin 21 and the inner skin 22 of the wheel arch 14a. Therefore, the insert member 31 is disposed so as to straddle the corner portion between the main body portion 31a of the dash panel lower 15 and the wheel arch 14a.

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

  When the automobile collides with the front, the collision load input to the front side frame 17 is transmitted to the dash panel lower 15 through the insert member 31, and is dispersed and absorbed by the floor panel 12 and the front pillar lower 14 from there. At this time, since the insert member 31 is a plate-like member having a large area, it is possible to prevent a local heavy load from acting on the dash panel lower 15 by dispersing the collision load over a wide range of the dash panel lower 15. can do.

  However, since the inclined wall portion 24 is connected via the corner portion directly below the vertical wall portion 23 of the dash panel lower 15 in which the insert member 31 is embedded, the outer skin 21 and the inner skin 22 at the corner portion are strong. A bending load may act, and the continuous fiber layer may delaminate and break.

  However, according to the present embodiment, the insert member 31 includes the lower extension portion 31 b extending rearward and downward from the main body portion 31 a embedded in the vertical wall portion 23, and the lower extension portion 31 b is embedded in the inclined wall portion 24. Therefore, the corner portion between the vertical wall portion 23 and the inclined wall portion 24 of the dash panel lower 15 is reinforced by the insert member 31, and the continuous fiber layers of the outer skin 21 and the inner skin 22 are delaminated at that portion. It is possible to effectively increase the strength of the dash panel lower 15 against the collision load without increasing the thickness of the outer skin 21 and the inner skin 22. At this time, since the insert member 31 has the plate thickness t1 in the inclined wall portion 24 larger than the plate thickness t2 in the vertical wall portion 23, the corner portion can be more effectively reinforced.

  Further, since the wheel arch 14a of the front pillar lower 14 continues in the vicinity of the insert member 31 embedded in the dash panel lower 15, the collision load input to the insert member 31 is dispersed from the wheel arch 14a to the front pillar lower 14. Although it is possible to absorb, a large bending load concentrates on the corner portion of the boundary between the vertical wall portion 23 of the dash panel lower 15 and the wheel arch 14a, and the continuous fiber layers of the outer skin 21 and the inner skin 22 are delaminated. there's a possibility that.

  However, according to the present embodiment, the insert member 31 includes the side extension 31c that extends outward from the main body 31a embedded in the vertical wall portion 23 in the vehicle width direction, and the side extension 31c is the wheel arch. 14a, the corner portion between the vertical wall portion 23 of the dash panel lower 15 and the wheel arch 14a is reinforced by the insert member 31, and the continuous fiber layers of the outer skin 21 and the inner skin 22 are delaminated at that portion. Can be prevented.

  The vertical wall portion 23 includes a first core member 25 sandwiched between the outer skin 21 and the inner skin 22. The first core member 25 extends in the vehicle width direction and has a large number of beads that are continuous with the front end of the floor tunnel 16. Because of the corrugated plate shape, the collision load of the frontal collision input from the front side frame 17 to the vertical wall portion 23 of the dash panel lower 15 is efficiently transmitted to the floor tunnel 16 via the first core member 25. Can be absorbed.

  In addition, the inclined wall portion 24 of the dash panel lower 15 includes a second core member 26 sandwiched between the outer skin 21 and the inner skin 22, and the second core member 26 has a corrugated plate shape having a number of beads extending in the front-rear direction. Therefore, the collision load of the frontal collision input from the front side frame 17 to the vertical wall portion 23 of the dash panel lower 15 is efficiently transmitted to the floor panel 12 via the second core member 26 of the inclined wall portion 24. Can be absorbed.

Second embodiment

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

  The insert member 31 of the first embodiment is made of metal, but the insert member 31 of the second embodiment is made of discontinuous fiber reinforced resin using carbon discontinuous fibers as an aggregate. Six nuts 33 having internal threads 33a are embedded. An annular flange 33b is provided on the outer periphery of the nut 33 so as to increase the coupling strength with the insert member 31.

  According to the present embodiment, it is possible to obtain the same operational effects as the first embodiment while reducing the weight of the insert member 31.

  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 of the embodiment, and may be another type of FRP such as GFRP (glass fiber reinforced resin).

12 floor panel 14a wheel arch 15 dash panel lower 16 floor tunnel 17 front side frame 21 outer skin 22 inner skin 23 vertical wall portion 24 inclined wall portion 25 first core material 26 second core material 31 insert member 31a main body portion 31b 31c Side extension 31e Female thread 32 Bolt 33 Nut 33a Female thread

Claims (7)

An outer skin (21) and an inner skin (22) in which a dash panel lower (15) standing from the front end of the floor panel (12) is laminated with a plurality of continuous fiber layers and hardened with a resin, and the outer skin (21) And a plate-like insert member (31) sandwiched between the inner skins (22), and a front side frame (17) contacting the front surface of the dash panel lower (15) is bolted to the insert member (31). The vehicle body structure to be fastened in (32),
The dash panel lower (15) includes a vertical wall portion (23) extending in the vertical direction and an inclined wall portion extending rearward and downward from the lower end of the vertical wall portion (23) and connected to the front end of the floor panel (12). (24), and the insert member (31) is located in the vertical wall (23) and has a main body (31a) having internal threads (31e, 33a) with which the bolt (32) is screwed. A vehicle body structure for an automobile, comprising: a lower extension (31b) extending from the lower end of the main body (31a) into the inclined wall (24).   2. The vehicle body structure according to claim 1, wherein the thickness of the insert member (31) in the inclined wall portion (24) is larger than the thickness of the vertical wall portion (23). .   A wheel arch (14a) is continuous outside the vertical wall portion (23) in the vehicle width direction, and the insert member (31) is disposed at a position adjacent to the wheel arch (14a). The vehicle body structure according to claim 1 or 2.   The vehicle body structure according to claim 3, wherein the insert member (31) includes a lateral extension (31c) extending from the main body (31a) into the wheel arch (14a).   The vertical wall portion (23) includes a first core material (25) sandwiched between the outer skin (21) and the inner skin (22), and the first core material (25) extends in the vehicle width direction. The vehicle body structure according to any one of claims 1 to 4, wherein the vehicle body structure has a corrugated shape having a large number of beads connected to the front end of the floor tunnel (16).   The inclined wall portion (24) includes a second core material (26) sandwiched between the outer skin (21) and the inner skin (22), and the second core material (26) extends in the front-rear direction. The vehicle body structure according to any one of claims 1 to 5, wherein the vehicle body structure has a corrugated shape having a bead of the following.   The said insert member (31) is a discontinuous fiber reinforced resin member which embedded the nut (33) which has the said internal thread (33a), The any one of Claims 1-6 characterized by the above-mentioned. Car body structure.

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