JP2018070084A - Auto body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance an energy absorption effect when a collision load is inputted to a CFRP rear pillar. A body floor 10 made of CFRP includes a pair of left and right rear pillars 13 standing from a rear portion of a floor panel 11, and a back panel 14 arranged in the vehicle width direction and connecting between the pair of left and right rear pillars 13. A metal honeycomb material 26 having an axis extending in the vehicle width direction is disposed inside the rear pillar 13, and the outer end portion in the vehicle width direction of the back panel 14 faces the honeycomb material 26. Is input, the metal honeycomb material 26 is pressed against the back panel 14 to effectively ductile breakage, whereby high energy absorption performance can be obtained. [Selection] Figure 4

Description

  The present invention relates to a vehicle body structure of an automobile in which a CFRP vehicle body floor includes a pair of left and right rear pillars standing from a rear portion of a floor panel, and a back panel arranged in the vehicle width direction and connecting between the pair of left and right rear pillars. .

  The center pillar of the automobile is composed of a center pillar upper made of CFRP and a center pillar lower made of aluminum casting, and an impact absorbing member made of a honeycomb material made of CFRP is arranged on the outer surface in the vehicle width direction of the center pillar upper and the center pillar lower. This is known from the following patent document 1.

  Patent Document 2 below discloses that a wheel house part of an automobile cabin formed in a bathtub shape with CFRP is composed of a honeycomb material in which an aluminum core material is sandwiched between two CFRP sheets.

JP 2015-47895 A Japanese Patent No. 5734465

  In the above-mentioned Patent Documents 1 and 2, when a collision load is input, the honeycomb material is crushed to absorb the collision energy, but the strength member that supports the collision load on the back surface of the honeycomb material Therefore, there is a concern that it is difficult to efficiently crush the honeycomb material and a sufficient energy absorption effect cannot be obtained.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to enhance the energy absorption effect when a collision load is input to a CFRP rear pillar.

  To achieve the above object, according to the first aspect of the present invention, a CFRP vehicle body floor is disposed in the vehicle width direction with a pair of left and right rear pillars standing from the rear of the floor panel, and the pair of left and right A vehicle body structure including a back panel connecting between the rear pillars, wherein a metal honeycomb material having an axis extending in the vehicle width direction is disposed inside the rear pillar, and an outer end of the back panel in the vehicle width direction. A vehicle body structure is proposed in which the portion faces the honeycomb material.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the back panel is configured by sandwiching a core material having an axis extending in the vehicle width direction between the outer skin and the inner skin. A vehicle body structure characterized by this is proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the back panel bends in a cross-sectional crank shape via an upper polygonal line and a lower polygonal line extending in the vehicle width direction. An upper panel, a central panel, and a lower panel are provided, the central panel is inclined from the front lower side to the rear upper side, the upper panel extends substantially upward from the upper end of the central panel, and the lower panel is the central panel A vehicle body structure is proposed which extends substantially downward from the lower end of the vehicle.

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, the end portion in the vehicle width direction of the back panel is joined to the center portion in the front-rear direction of the rear pillar. A vehicle body structure is proposed which is characterized by the above.

  According to the fifth aspect of the present invention, in addition to the structure of any one of the first to fourth aspects, the rear pillar has a thickness in the vehicle width direction that overlaps the rear edge of the closed door. A small door opening edge portion and a skeleton portion having a larger thickness in the rear direction of the vehicle than the closed door, and the honeycomb material is disposed across the door opening edge portion and the skeleton portion, and the door A vehicle body structure for an automobile is proposed in which the door beam provided on the door faces only the door opening edge of the door opening edge and the skeleton.

  According to the sixth aspect of the invention, in addition to the configuration of the fifth aspect, the door opening edge and the skeleton have substantially flat inner walls in the vehicle width direction, and the outer walls in the vehicle width direction have steps. A vehicle body structure for an automobile is proposed in which the honeycomb material is supported inside the rear pillar by a support member provided on the inner wall in the vehicle width direction.

  According to the invention described in claim 7, in addition to the configuration of any one of claims 1 to 6, the rear pillar is erected upward from the rear end portion of the side sill, and the honeycomb material A vehicle body structure is proposed in which the vehicle is disposed across the rear sill from the rear pillar.

  According to an eighth aspect of the present invention, in addition to the structure of any one of the first to seventh aspects, the rear pillar is positioned on the outer side in the vehicle width direction and on the inner side in the vehicle width direction. An automobile body structure is proposed in which the inner skin is joined to form a closed cross section, and the outer skin is lower in strength than the inner skin.

  According to the first aspect of the present invention, the CFRP vehicle body floor includes a pair of left and right rear pillars standing from the rear portion of the floor panel, and a back panel arranged in the vehicle width direction and connecting the pair of left and right rear pillars. A metal honeycomb material having an axis extending in the vehicle width direction is arranged inside the rear pillar, and the outer end portion in the vehicle width direction of the back panel faces the honeycomb material, so that when a collision load of a side collision is input to the rear pillar High energy absorption performance can be obtained by pressing the metal honeycomb material against the back panel and effectively causing ductile fracture.

  According to the second aspect of the present invention, since the back panel is configured by sandwiching the core material having the axis extending in the vehicle width direction between the outer skin and the inner skin, the strength of the back panel is increased and the rear pillar is By firmly supporting from the inner side in the direction, the honeycomb material can be efficiently crushed and the energy absorption performance can be enhanced.

  According to the third aspect of the present invention, the back panel includes an upper panel, a central panel, and a lower panel that are bent in a crank section through an upper fold line and a lower fold line that extend in the vehicle width direction. The back panel is inclined at the rear and upward, the upper panel extends substantially upward from the upper end of the central panel, and the lower panel extends substantially downward from the lower end of the central panel. The impact load can be reliably supported to enhance the energy absorption performance of the honeycomb material, and the space for installing the seat belt retractor can be secured in front of the upper portion of the back panel on the inner surface in the vehicle width direction of the rear pillar.

  According to the fourth aspect of the invention, the vehicle width direction end portion of the back panel is joined to the center portion in the front-rear direction of the rear pillar, so that the collision load input to the rear pillar is efficiently transmitted to the back panel to absorb energy. Can be increased.

  According to the fifth aspect of the present invention, the rear pillar includes a door opening edge portion that overlaps a rear edge portion of the closed door and has a small vehicle width direction thickness, and a skeleton that has a vehicle width direction thickness behind the closed door and that is greater in the vehicle width direction. The honeycomb material is arranged across the door opening edge and the skeleton, and the door beam provided on the door faces only the door opening edge of the door opening edge and the skeleton, The collision load input to the door is transmitted to the thin door opening edge via the door beam and directly to the thick skeleton, so that the entire rear pillar can absorb the collision energy.

  According to the configuration of claim 6, the door opening edge and the skeleton have substantially flat inner walls in the vehicle width direction and stepped outer walls in the vehicle width direction, and the honeycomb material is provided on the inner wall in the vehicle width direction. Since the support member supports the inside of the rear pillar, the honeycomb material whose thickness changes at the front part and the rear part can be accurately and firmly fixed inside the rear pillar.

  According to the seventh aspect of the present invention, the rear pillar is erected upward from the rear end portion of the side sill, and the honeycomb material is disposed so as to straddle the side sill from the rear pillar. The energy absorption performance can be improved by sharing it with the side sill.

  Further, according to the configuration of claim 8, the rear pillar is configured to have a closed cross-section by connecting the outer skin positioned on the outer side in the vehicle width direction and the inner skin positioned on the inner side in the vehicle width direction, and the outer skin is stronger than the inner skin. Since it is low, when the collision load of the side collision is input to the rear pillar, the energy absorption performance can be enhanced by easily deforming the outer skin and efficiently crushing the honeycomb material.

The perspective view of the body floor made from CFRP. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. The perspective view of a honeycomb material. FIG. 5 is a view in the direction of arrows 5 in FIG. 4. Explanatory drawing of the manufacturing method of a honeycomb material. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG.

  Hereinafter, embodiments 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 a driver seat.

  As shown in FIGS. 1 to 3, the body floor 10 of a two-seat sports type automobile is basically composed of CFRP (carbon fiber reinforced resin), and front and rear along the left and right sides of the floor panel 11. A back panel 14 is provided with a pair of left and right side sills 12, 12 extending in the direction and a pair of left and right rear pillars 13, 13 rising rearward and upward from the rear ends of the left and right side sills 12, 12. The left and right side edges of the left and right rear pillars 13 and 13 are joined to the inner surfaces in the vehicle width direction.

  The floor panel 11 has a corrugated core material 18 (see FIG. 1) sandwiched between an outer skin 16 on the outer side (lower side) of the vehicle body and an inner skin 17 on the inner side (upper side) of the vehicle body. A bulging portion 11a bulging in a triangular shape in a side view is formed on the upper side. The side sill 12 and the rear pillar 13 constitute a side member 19. The side sill 12 and the rear pillar 13 are formed in a closed cross section by joining an outer skin 20 on the outer side in the vehicle width direction and an inner skin 21 on the inner side in the vehicle width direction. Bonded to the upper surface of both sides in the vehicle width direction by bonding. The rear pillar 13 rises obliquely upward and rearward along the upper surface of the triangular bulge 11a of the floor panel 11.

  Mounting brackets 22, 22 that are bent in a crank shape are fixed to the inner surfaces in the vehicle width direction of the left and right rear pillars 13, 13, and backs that stand up from the rear ends of the floor panel 11 on the rear surfaces of these mounting brackets 22, 22. The left and right edges of the panel 14 are fixed. At this time, by connecting the rear surface of the back panel 14 and the inner surfaces in the vehicle width direction of the rear pillars 13 and 13 with plate-like covers 23 and 23, gaps generated by forming the bulging portions 11a and 11a are closed. (See FIG. 3). Support brackets 24 and 24 for supporting a seat belt retractor (not shown) are provided on the inner surfaces in the vehicle width direction of the rear pillars 13 and 13 facing the front surface of the upper end portion of the back panel 14 inclined from the front lower side to the rear upper side. It is done.

  As shown in FIG. 7A, the inner skin 21 on the inner side in the vehicle width direction of the rear pillar 13 is substantially flat, but the outer skin 20 on the outer side in the vehicle width direction of the rear pillar 13 is bent in a crank shape. A door opening edge 13a that fits the rear edge of the door 25 is formed on the outer surface of the rear pillar 13 in the vehicle width direction, and is aligned behind the door opening edge 13a and flush with the outer surface of the door 25 in the vehicle width direction. The thickness in the vehicle width direction of the rear pillar 13 at the door opening edge portion 13a where the portion 13b is formed is reduced by the thickness of the rear edge portion of the door 25 fitted therein, and the vehicle width of the skeleton portion 13b. The directional thickness is increased to obtain the required strength. An aluminum alloy honeycomb material 26 having an axis extending in the vehicle width direction is disposed inside the rear pillar 13, and the front portion of the honeycomb material 26 extends so as to straddle the rear end portion of the side sill 12. (See FIG. 1).

  As shown in FIG. 6, the honeycomb material 26 includes a plurality of corrugated plates 27 in which a first vertical piece 27a, a first inclined piece 27b, a second vertical piece 27c, and a second inclined piece 27d are continuously repeated. The pieces 27a... And the second vertical pieces 27c are bonded one after another so that they are in contact with each other, and have a shape in which a large number of hexagonal cross-sections are continuous vertically and horizontally.

  As shown in FIGS. 3 to 5, an aluminum alloy cast or synthetic resin support member 28 in which a large number of hexagons continue vertically and horizontally is bonded to the outer surface in the vehicle width direction of the inner skin 21 of the rear pillar 13. The inner end in the vehicle width direction of the honeycomb material 26 in which the axis of the hexagonal cross section is arranged in the vehicle width direction is fitted into the groove 28a of the support member 28 and fixed by bonding (see FIG. 5). In this state, the outer end in the vehicle width direction of the honeycomb material 26 is abutted against the inner surface in the vehicle width direction of the outer skin 20 of the rear pillar 13 and fixed by bonding (see FIG. 3). The plate thickness of the outer skin 20 is smaller than the plate thickness of the inner skin 21, and thus the strength of the outer skin 20 is lower than the strength of the inner skin 21.

  As shown in FIG. 2, the back panel 14 is formed by sandwiching a corrugated core material 31 having an axis in the vehicle width direction between an outer skin 29 on the rear side and an inner skin 30 on the front side. The upper bent line 14a and the lower bent line 14b extending in the direction are bent in a crank shape in cross section. The central panel 14d sandwiched between the upper broken line 14a and the lower broken line 14b is inclined from the front lower side to the rear upper side, the upper panel 14c extends substantially upward from the upper end of the central panel 14d, and the lower panel 14e is the lower end of the central panel 14d. Extends substantially downward. Both ends of the back panel 14 in the vehicle width direction face the inner surfaces in the vehicle width direction of the left and right honeycomb members 26 with the inner skin 21 of the rear pillar 13 interposed therebetween (see FIG. 3). The back panel 14 is positioned at a substantially central portion of the width of the rear pillars 13 and 13 in the front-rear direction. Therefore, the rear portions of the rear pillars 13 and 13 protrude rearward from the back panel 14 (see FIG. 2).

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

  When a collision load of a side collision is input to the rear pillar 13 standing from the rear portion of the side sill 12 of the body floor 10 of the automobile, the metal honeycomb material 26 disposed inside the rear pillar 13 is ductile fractured in the axial direction to generate collision energy. Absorb. At this time, the inner surfaces in the vehicle width direction of the left and right rear pillars 13 and 13 are connected by the back panel 14 extending in the vehicle width direction, so that the collision load is supported by the back panel 14 and a large axial load is applied to the honeycomb material 26. By doing so, the honeycomb material 26 can be efficiently crushed to exhibit a large energy absorption effect.

  Further, if the strength of the door opening edge 13a of the rear pillar 13 is too high, the door beam 15a may be curved in an arc shape due to a collision load, and may enter the vehicle interior from the door opening. The honeycomb material 26 is crushed to prevent the door beam 15a from being bent, so that the door beam 15a can be prevented from entering the vehicle interior.

  In addition, since the rear pillar 13 stands upward from the rear end portion of the side sill 12 and the honeycomb material 26 is disposed across the side sill 12 from the rear pillar 13, a side impact collision load is applied not only to the rear pillar 13 but also to the side sill 12. Energy absorption performance can also be improved by sharing them. Further, the rear pillar 13 is configured by connecting an outer skin 20 positioned on the outer side in the vehicle width direction and an inner skin 21 positioned on the inner side in the vehicle width direction, and the outer skin 20 has a lower strength than the inner skin 21. When the collision load of the side collision is input to the rear pillar 13, the energy absorption performance can be enhanced by easily deforming the outer skin 20 and efficiently crushing the honeycomb material 26.

  Further, since the back panel 14 has a honeycomb structure in which the core material 31 having an axis extending in the vehicle width direction is sandwiched between the outer skin 20 and the inner skin 21, the strength of the back panel 14 is increased and the rear pillar 13 is moved in the vehicle width direction. Since the honeycomb material 26 is efficiently crushed by a collision load, the energy absorption performance can be improved.

  Further, the end of the back panel 14 in the vehicle width direction is not only joined to the center in the front-rear direction of the rear pillar 13, but the back panel 14 is crank-shaped in cross section via an upper fold line 14a and a lower fold line 14b extending in the vehicle width direction. A bent upper panel 14c, a central panel 14d, and a lower panel 14e are provided, and the central panel 14d is inclined from the front lower side to the rear upper side. The upper panel 14c extends substantially upward from the upper end of the central panel 14d. Since 14e extends substantially downward from the lower end of the central panel 14d (see FIG. 2), the back panel 14 can be prevented from falling due to a collision load, and the energy absorption performance can be improved.

  In addition, since the back panel 14 is inclined from the front lower side to the rear upper side, the seat bracket winding bracket support bracket 24 is provided in front of the upper portion of the back panel 14 on the inner surface in the vehicle width direction of the rear pillar 43. An installation space for the belt winding device can be secured (see FIG. 2).

  The rear pillar 13 includes a door opening edge portion 13a having a small thickness in the vehicle width direction and overlapping a rear edge portion of the closed door 25, and a skeleton portion 13b having a larger thickness in the vehicle width direction behind the closed door 25. Since the honeycomb material 26 is disposed across the door opening edge portion 13a and the skeleton portion 13b, the door beam 25a of the door 25 faces only the door opening edge portion 13a of the door opening edge portion 13a and the skeleton portion 13b. The collision load of the side collision input to the door 25 is transmitted to the thin door opening edge 13a via the door beam 25a and directly to the thick skeleton 13b, so that the entire rear pillar 13 absorbs the collision energy. (See FIG. 7B).

  Moreover, the door opening edge portion 13a and the skeleton portion 13b are substantially flat in the inner skin 21 constituting the inner wall in the vehicle width direction, the outer skin 20 constituting the outer wall in the vehicle width direction has a step, and the honeycomb material is 26 inner. Since it is supported inside the rear pillar 13 by the support member 28 provided on the skin 21, the honeycomb material 26 whose thickness changes at the front part and the rear part can be fixed accurately and firmly inside the rear pillar 13.

  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, a large number of corrugated plates 27 are bonded to form the honeycomb material 26. However, mechanical bonding such as caulking can be employed instead of bonding.

  In the embodiment, the thickness of the outer skin 20 of the rear pillar 14 is made thinner than the thickness of the inner skin 21 to reduce the strength. However, the fiber length and fiber density of the CFRP outer skin 20 are set to the inner skin 21. The fiber length and fiber density may be made smaller to reduce the strength.

DESCRIPTION OF SYMBOLS 10 Body floor 11 Floor panel 12 Side sill 13 Rear pillar 13a Door opening edge part 13b Frame | skeleton part 14 Back panel 14a Upper broken line 14b Lower broken line 14c Upper panel 14d Central panel 14e Lower panel 20 Outer skin 21 Inner skin 25 Door 25a Door beam 26 Honeycomb material 28 Support member 29 Outer skin 30 Inner skin 31 Core material

Claims (8)

A CFRP body floor (10) has a pair of left and right rear pillars (13) standing up from the rear of the floor panel (11) and a back panel arranged in the vehicle width direction to connect the pair of left and right rear pillars (13). (14) a vehicle body structure comprising:
A metal honeycomb material (26) having an axis extending in the vehicle width direction is disposed inside the rear pillar (13), and an outer end portion in the vehicle width direction of the back panel (14) faces the honeycomb material (26). A vehicle body structure characterized by that.   The back panel (14) is configured by sandwiching a core material (31) having an axis extending in the vehicle width direction between an outer skin (29) and an inner skin (30). Vehicle body structure described.   The back panel (14) includes an upper panel (14c), a center panel (14d) and a lower panel (14e) which are bent in a crank shape through an upper fold line (14a) and a lower fold line (14b) extending in the vehicle width direction. The central panel (14d) is inclined from the front lower side to the rear upper side, the upper panel (14c) extends substantially upward from the upper end of the central panel (14d), and the lower panel (14e). The vehicle body structure according to claim 1 or 2, characterized in that extends substantially downward from a lower end of the central panel (14d).   The vehicle width direction end part of the said back panel (14) is joined to the front-back direction center part of the said rear pillar (13), The automobile of any one of Claims 1-3 characterized by the above-mentioned. Body structure.   The rear pillar (13) includes a door opening edge portion (13a) having a small thickness in the vehicle width direction and overlapping a rear edge portion of the closed door (25), and a skeleton having a thickness in the vehicle width direction behind the closed door. The honeycomb material (26) is disposed across the door opening edge (13a) and the skeleton (13b), and is provided with a door beam (25a) provided on the door (25). 5) is opposed to only the door opening edge (13 a) of the door opening edge (13 a) and the skeleton (13 b), according to any one of claims 1 to 4. Vehicle body structure described.   The door opening edge portion (13a) and the skeleton portion (13b) are substantially flat in the vehicle width direction inner wall and have a step in the vehicle width direction outer wall, and the honeycomb material (26) is the vehicle width direction inner wall. 6. The vehicle body structure according to claim 5, wherein the vehicle body structure is supported inside the rear pillar (13) by a support member (28).   The rear pillar (13) is erected upward from the rear end of the side sill (12), and the honeycomb material (26) is disposed across the side sill (12) from the rear pillar (13). The vehicle body structure according to any one of claims 1 to 6, wherein the vehicle body structure is characterized. The rear pillar (13) has an outer skin (20) positioned on the outer side in the vehicle width direction and an inner skin (21) positioned on the inner side in the vehicle width to form a closed cross section, and the outer skin (20) The vehicle body structure according to any one of claims 1 to 7, characterized in that the strength is lower than that of the skin (21).

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