JP2008155700A - Body floor structure - Google Patents

Abstract

A vehicle body floor structure capable of improving energy absorption performance with respect to load input inward in the vehicle width direction is obtained.
A vehicle body floor structure 10 has a floor tunnel 16 portion extending in the vehicle longitudinal direction at the vehicle body central portion and energy extending in the vehicle longitudinal direction at an outer end portion in the vehicle width direction with a closed cross-sectional structure. Fixed to the outer side in the vehicle width direction of the energy absorption skeleton 46, the absorption skeleton 46, the front cross member 36 and the rear cross member 38 that extend in the vehicle width direction and connect the floor tunnel 16 and the energy absorption skeleton 46, respectively. And an energy absorbing portion 44 provided for the purpose.
[Selection] Figure 1

Description

  The present invention relates to a vehicle body floor portion structure.

There is known a structure in which a reinforcing material made of an aluminum alloy having a sun-shaped cross section is arranged in a rocker that forms a skeleton in the longitudinal direction of the vehicle body on the outer side of the vehicle body so that the partition wall is the same as the floor panel ( For example, see Patent Document 1).
Japanese Patent Laid-Open No. 7-132860 JP 2003-54443 A

  However, the conventional techniques as described above have improved the bending rigidity of the rocker.

  In view of the above fact, an object of the present invention is to obtain a vehicle body floor structure that can improve energy absorption performance with respect to load input inward in the vehicle width direction.

  The vehicle body floor structure according to the first aspect of the present invention has a closed vertical cross-section structure with a central longitudinal skeleton portion extending in the vehicle longitudinal direction at the vehicle body central portion, and in the vehicle longitudinal direction at the outer end in the vehicle width direction. A plurality of horizontal skeleton portions extending in the vehicle width direction and connecting the central vertical skeleton portion and the side vertical skeleton portion at at least two points spaced apart in the vehicle longitudinal direction. And an energy absorbing portion fixedly provided on the outer side in the vehicle width direction of the side vertical skeleton portion.

  In the vehicle body floor portion structure according to the first aspect, for example, when a side collision occurs in the applied vehicle, a collision load is input to the energy absorbing portion inward in the vehicle width direction. The collision load is distributed from the side vertical skeleton portion to the plurality of horizontal skeleton portions and transmitted to the central vertical skeleton portion to be supported. As a result, the energy absorbing portion receives the collision load and absorbs the collision energy while being deformed. As described above, in the vehicle body floor portion structure, the energy absorbing portion is fixed to the wall portion on the outer side in the vehicle width direction of the side vertical skeleton portion of the closed cross-sectional structure, and the side vertical skeleton portion has a plurality of horizontal skeleton portions. Since it is connected to the central vertical skeleton part via the skeleton part (having a rectangular frame-like closed section structure in plan view), the load input to the shock absorbing part is dispersed in the longitudinal direction of the vehicle body It is transmitted to and supported by the central longitudinal skeleton. For this reason, deformation of the energy absorbing portion is ensured and energy is efficiently absorbed, and deformation of the floor (movement of the energy absorbing portion inward in the vehicle width direction) is suppressed.

  Thus, in the vehicle body floor portion structure according to the first aspect, the energy absorption performance with respect to the load input inward in the vehicle width direction can be improved.

  The vehicle body floor portion structure according to a second aspect of the present invention is the vehicle body floor portion structure according to the first aspect, wherein the plurality of horizontal skeleton portions are positioned on the front side in the vehicle front-rear direction from the mounting portion of the occupant seat. Including a front horizontal skeleton portion and a rear horizontal skeleton portion located on the rear side in the vehicle longitudinal direction with respect to the seat mounting portion, and the energy absorbing portion is at least the full length of the seat installation range in the vehicle longitudinal direction. It extends over.

  In the vehicle body floor portion structure according to claim 2, the front horizontal skeleton portion, the rear horizontal skeleton portion, the central vertical skeleton portion, and the side vertical skeleton portion form a rectangular (tetragonal) frame shape. An occupant seating seat is disposed in a range surrounded by the rectangular frame. Since the energy absorbing portion extends at least including the range in the front-rear direction of the seat mounting portion, in the vehicle body floor portion structure, the vehicle body floor portion is subjected to local load input to the side portion of the seat. It is possible to prevent the local deformation of.

  The vehicle body floor portion structure according to the invention described in claim 3 is the vehicle body floor portion structure according to claim 1 or claim 2, wherein the side vertical skeleton portion is a closed cross-section portion made of fiber reinforced plastic, And a reinforcing portion provided in the closed cross section.

  In the vehicle body floor portion structure according to claim 3, since the side vertical skeleton portion is configured by incorporating the reinforcing portion in the closed cross section made of fiber reinforced plastic, the rigidity and strength of the side vertical skeleton portion are improved. The load can be dispersed over a wide range in the longitudinal direction of the vehicle body via the plurality of horizontal skeleton portions.

  A vehicle body floor portion structure according to a fourth aspect of the present invention is the vehicle body floor portion structure according to any one of the first to third aspects, wherein the energy absorbing portion is made of a fiber reinforced plastic and has a vehicle body vertical direction. And a trough that is concave upward in the vehicle body vertical direction are formed in a corrugated shape that is alternately continuous in the vehicle longitudinal direction.

  In the vehicle body floor portion structure according to the fourth aspect, since the energy absorbing portion made of fiber reinforced plastic is formed in a corrugated shape, the energy can be effectively absorbed while being lightweight. In particular, if the energy absorbing portion is formed in a corrugated plate shape in which arc-shaped peaks and valleys are alternately continued, good energy absorption efficiency and load reproducibility can be obtained. . For this reason, for example, even when the load input direction to the vertical skeleton member is an oblique direction with respect to the vehicle width direction, the energy absorbing portion can be reliably deformed to perform the energy absorbing function.

  A vehicle body floor portion structure according to a fifth aspect of the present invention is the vehicle body floor portion structure according to any one of the first to fourth aspects, wherein the central vertical skeleton portion opens downward in the vehicle body vertical direction. A tunnel portion that protrudes from the floor and extends in the longitudinal direction of the vehicle body, and extends in the longitudinal direction of the vehicle body along the opening edges on both sides in the vehicle width direction of the tunnel portion, and the same side in the width direction with respect to the tunnel portion. A pair of tunnel side skeleton portions that are connected to the inner ends in the vehicle width direction of the plurality of horizontal skeleton portions located at a position, and a plurality of connecting members that extend in the vehicle width direction and connect the tunnel side skeleton portions. It is configured.

  In the vehicle body floor portion structure according to claim 5, the load transmitted from the side vertical skeleton portion to the tunnel side skeleton portion via the plurality of horizontal skeleton portions is supported by the tunnel side skeleton portion and the tunnel portion, Further, it is transmitted to the horizontal skeleton portion and the side vertical skeleton portion on the opposite side in the vehicle width direction via the connecting member. Thereby, in the structure which has a tunnel part, the energy absorption performance with respect to the load input of the vehicle width direction inward can be improved.

  As described above, the vehicle body floor structure according to the present invention has an excellent effect that the energy absorption performance with respect to the load input inward in the vehicle width direction can be improved.

  A vehicle body floor portion structure 10 to which the vehicle body floor portion structure according to the first embodiment of the present invention is applied will be described with reference to FIGS. 1 to 7. In the figure, the arrow FR indicates the front direction of the vehicle body, the arrow UP indicates the upward direction of the vehicle body, the arrow IN indicates the vehicle width direction inside, and the arrow OUT indicates the vehicle width direction outside.

  FIG. 1 is a perspective view showing a schematic overall configuration of a vehicle body B to which the vehicle body floor structure 10 is applied. As shown in this figure, the vehicle body B includes a pair of left and right rockers 12 each having a longitudinal length in the longitudinal direction of the vehicle body. The left and right rockers 12 as the side vertical frame portions are joined to the outer ends in the vehicle width direction of the floor panels 14 constituting the vehicle body floor F, respectively. The parts are respectively joined to a floor tunnel 16 as a central vertical skeleton part elongated in the longitudinal direction of the vehicle body.

  Specifically, as shown in FIG. 4, the floor tunnel 16 includes a tunnel main body 18 as a tunnel portion that opens downward in the vehicle body vertical direction to form a tunnel space T, and both sides of the tunnel main body 18 in the vehicle width direction. And a tunnel side skeleton portion 20 having a closed cross-sectional structure formed at the opening edge portion. As shown in FIG. 1, the tunnel main body 18 and the tunnel side skeleton 20 constituting the floor tunnel 16 are formed over the entire length of the floor panel 14. On the other hand, although details will be described later, each rocker 12 has a closed cross-sectional structure. The floor panel 14 is joined to the lower surface 12A of the rocker 12 and the lower surface 20A of the tunnel side skeleton 20.

  In addition, each rocker 12 has a front end 12B that is continuous with a lower end 22A of a front pillar 22 that extends substantially in the vertical direction of the vehicle body. Although not shown, the left and right front pillars 22 extend in the vertical direction of the vehicle body as shown in FIG. 1 and hold the windshield glass between them. Further, the left and right front pillars 22 are joined to different ends of the dash panel 24 in the vehicle width direction. The dash panel 24 extends in the vehicle width direction and the vehicle body vertical direction, and separates the vehicle compartment C and a space Rf located in front of the vehicle compartment C. A rear end portion of a pair of left and right front side members (not shown) is connected to the dash panel 24, and the front ends of the left and right front side members are bridged by a bumper reinforcement that forms a front bumper. ing. A notch 24 </ b> A that opens the front end of the tunnel main body 18 constituting the floor tunnel 16 to the front space Rf is formed at the center of the dash panel 24 in the vehicle width direction.

  On the other hand, the rear ends 12 </ b> C of the left and right rockers 12 are continuous with lower ends 26 </ b> A of rear pillars 26 (which can be grasped as center pillars) 26 extending substantially along the vehicle body vertical direction. Rear side members (not shown) are connected to the rear ends 12C and the rear pillars 26 of the left and right rockers 12.

  Further, the left and right rear pillars 26 are joined to different end portions of the room partition panel 28 in the vehicle width direction. The room partition panel 28 extends in the vehicle width direction and the vehicle body vertical direction, and separates the vehicle compartment C from the space Rr behind the vehicle compartment C. A notch (not shown) that opens the rear end of the floor tunnel 16 to the rear space Rr is formed at the center of the room partition panel 28 in the vehicle width direction.

  In addition, the automobile body B includes a cross member 30 that is elongated in the vehicle width direction and connects the rocker 12 (an inner wall 56 described later) and the tunnel side skeleton 20 of the floor tunnel 16 on the upper side of the floor panel 14. Yes. In this embodiment, a pair of front and rear cross members 30 that are arranged in parallel in the longitudinal direction of the vehicle body and have a closed cross section with the floor panel 14 are provided. A fastening hole 30 </ b> A is formed in the front and rear cross members 30 in order to fixedly attach a pair of left and right seat rails 32. As shown in FIG. 3, the pair of left and right seat rails 32 supports a seat frame 34 that constitutes a seat for occupant seating so as to be slidable in the longitudinal direction of the vehicle body. It should be noted that the front and rear cross members 30 may be assembled as components of a sheet holding cross member that can be handled integrally.

  Further, as shown in FIG. 1, the vehicle body floor structure 10 constituting the automobile body B has a rocker 12 (an inner wall 56 to be described later) and a tunnel of the floor tunnel 16 on the front side in the vehicle longitudinal direction with respect to the front and rear cross members 30. A front cross member 36 serving as a front horizontal skeleton portion that connects the side skeleton portion 20 is provided. Further, the vehicle body floor portion structure 10 includes a rear lateral skeleton portion that connects the rocker 12 (an inner wall 56 described later) and the tunnel side skeleton portion 20 of the floor tunnel 16 on the rear side in the vehicle longitudinal direction with respect to the front and rear cross members 30. The rear cross member 38 is provided.

  The front cross member 36 has a closed section structure with the floor panel 14 behind the dash panel 24, and the rear cross member 38 has a closed section structure with the floor panel 14 and the room partition panel 28. . In other words, the rear cross member 38 is disposed at the rearmost and lowermost part of the passenger compartment C.

  The vehicle body B described above includes a rocker 12, a floor panel 14 (floor tunnel 16), a front pillar 22, a dash panel 24, a rear pillar 26, a room partition panel 28, a cross member 30, a front cross member 36, which are the main parts. The rear cross members 38 are each made of carbon fiber reinforced plastic (hereinafter referred to as CFRP).

  As shown in FIG. 2, the vehicle body floor portion structure 10 includes a plurality of tunnel braces 40 as connecting members that bridge between the left and right tunnel side skeleton portions 20. In this embodiment, a total of three tunnel braces 40 are provided so as to bridge between the connecting portion 20B of the front and rear cross members 30 and the connecting portion 20C of the front cross member 36 in the tunnel side skeleton 20. As shown in FIG. 4, the tunnel brace 40 is fixed to the tunnel side skeleton 20 by fastening means 41. In this embodiment, the fastening means 41 includes a fastening collar 41A embedded in the tunnel side skeleton portion 20 and a bolt 41B that is screwed into the fastening collar 41A. 40 is metal

  The vehicle body floor structure 10 includes an energy absorbing member assembly 42 disposed in the rocker 12 as shown in FIGS. 1 and 3A. The energy absorbing member assembly 42 includes an energy absorbing portion 44 and an energy absorbing skeleton portion 46 as a side vertical skeleton portion as main parts. This will be specifically described below.

  As shown in FIGS. 5 (A) and 5 (B), the energy absorbing portions 44 of the energy absorbing member assembly 42 are alternately continuous in the longitudinal direction where the ridge portions 44A and the valley portions 44B coincide with the longitudinal direction of the vehicle body. And it is formed in the shape of a corrugated sheet (corrugated) by side view, and is made into substantially equal width over the full length. The peak portions 44A and the valley portions 44B of the energy absorbing portion 44 are each formed in a substantially semicircular arc shape when viewed from the side.

  More specifically, the energy absorbing portion 44 has a semicircular arc shape in which the peak portion 44A opens downward in the vehicle body vertical direction, and a semicircular arc shape in which the valley portion 44B opens upward in the vehicle body vertical direction. It is arranged. That is, in the energy absorbing portion 44, with the energy absorbing member assembly 42 disposed in the rocker 12 as will be described later, the top portion of the peak portion 44A becomes the upper end 44C (see FIG. 4) in the vehicle body vertical direction, and the trough portion 44B The top is the lower end 44D (see FIG. 4) in the vertical direction of the vehicle body. The energy absorbing unit 44 described above is configured by CFRP.

  As shown in FIGS. 5A and 5B, the energy absorbing skeleton 46 is fixed to one end 44E in the width direction that coincides with the vehicle width direction in the energy absorbing portion 44. The energy absorption skeleton portion 46 has a height in the vertical direction of the vehicle body that is slightly larger than a height along the vehicle vertical direction from the upper end 46C to the lower end 46D of the energy absorption portion 44 in the vertical direction of the vehicle body. The whole width direction end face (corrugated end face) is fixed. Further, in this embodiment, the energy absorption skeleton portion 46 has a total length along the vehicle body longitudinal direction that is slightly larger than the total length of the energy absorption portion 44, and both longitudinal ends thereof are opposite to the longitudinal ends of the energy absorption portion 44. Projects in the front-rear direction.

  As shown in a sectional view taken along line 6-6 in FIG. 5A, the energy absorbing skeleton 46 is closed in a substantially rectangular frame shape that is long in the vertical direction of the vehicle body in a cross-sectional view perpendicular to the longitudinal direction. The cross section 48 includes an insert body 50 as a reinforcing portion that fills the internal space of the closed cross section 48. In this embodiment, the insert body 50 is made of CFRP, and the inner space is filled over the entire length of the insert body 50 formed in a block shape with CFRP.

  On the other hand, in the energy absorbing member assembly 42, the other end 44F in the width direction of the energy absorbing portion 44 is a free end. 3A and 4, the energy absorbing member assembly 42 is disposed in the rocker 12 so that the other end 44F in the width direction of the energy absorbing portion 44 faces outward in the vehicle width direction. Yes.

  Here, supplementing the rocker 12, as shown in FIG. 4, the rocker 12 has a closed cross section having a substantially rectangular frame shape in a cross section perpendicular to the longitudinal direction. More specifically, the rocker 12 includes an upper wall 52 and a lower wall 54 that face the vehicle body in the vertical direction, and an inner wall 56 and an outer wall 58 that connect both ends of the upper wall 52 and the lower wall 54 in the vehicle width direction. It has a closed cross-section structure. The interior space of the rocker 12 is divided into three in the vertical direction of the vehicle body by the ribs 60 and 62. The rib 60 located below the rib 62 in the vertical direction of the vehicle body is located on the front and rear cross members 30, the front cross member 36, and the rear cross member 38 with respect to the upper walls 30B, 36A, and 38A facing the floor panel 14. The positions in the vertical direction are substantially the same (at least a part of the plate thickness overlaps in the vertical direction of the vehicle body). That is, the upper walls 30 </ b> B, 36 </ b> A, 38 </ b> A and the rib 60 are arranged in a substantially straight line with the inner wall 56 interposed therebetween.

  In the vehicle body floor portion structure 10, the inner space of the rocker 12 is surrounded by a space 64 positioned at the lowermost side in the vertical direction of the vehicle body, that is, by the lower wall 54, the inner wall 56, the outer wall 58, and the rib 60. An energy absorbing member assembly 42 is disposed in the remaining space 64. As shown in FIGS. 1 and 3A, the energy absorbing skeleton 46 of the energy absorbing member assembly 42 is arranged so as to bridge between the front cross member 36 and the rear cross member 38. That is, the front end portion 46A and the rear end portion 46B of the energy absorbing skeleton portion 46 are arranged so as to overlap the installation range of the front cross member 36 and the rear cross member 38 in the vehicle body longitudinal direction. In this embodiment, the front and rear ends of the energy absorbing portion 44 are overlapped with the installation range of the rear cross member 38 in the longitudinal direction of the vehicle body.

  As shown in FIG. 4, the energy absorption skeleton portion 46 has a side surface opposite to the fixing side of the energy absorption portion 44 in the closed cross-section portion 48, that is, an inner side surface 48 </ b> A in the vehicle width direction adhered to an inner surface 56 </ b> A of the inner side wall 56. It is fixed by etc. Thereby, it is set as the structure by which the attitude | position of the energy absorption member assembly 42 (energy absorption part 44) with respect to the rocker 12 is hold | maintained. The space 64 is filled with a foamed urethane foam 65 so that the energy absorbing member assembly 42 is supplementarily held with respect to the rocker 12. In this state, the other end in the width direction (outer end in the vehicle width direction) 44 </ b> F of the energy absorbing portion 44 is located close to the outer wall 58.

  As described above, in the vehicle body floor portion structure 10, as shown in FIG. 3A, the tunnel side skeleton portion 20, the energy absorption skeleton portion 46, the front cross member 36, and the rear cross member 38 of the floor tunnel 16. A frame-shaped body 66 having a substantially rectangular frame shape in plan view is formed. Further, in the vehicle body floor structure 10, frame bodies 66 positioned on both sides in the vehicle width direction across the floor tunnel 16 are connected to each other via the floor tunnel 16 and the three tunnel braces 40 (not shown). .

  Next, the operation of the first embodiment will be described.

  In the vehicle body floor structure 10 having the above configuration, when a side collision occurs in an automobile having the applied automobile body B, a load inward in the vehicle width direction is input to the rocker 12. This load is input to the energy absorbing portion 44 of the energy absorbing member assembly 42, and is dispersed in the vehicle body longitudinal direction by the energy absorbing skeleton portion 46 of the energy absorbing member assembly 42, while the front cross member 36, the rear cross member 38, It is transmitted to the tunnel side frame 20 and the floor tunnel 16 via the cross member 30, and further transmitted to the vehicle body floor F on the opposite side in the vehicle width direction via a plurality of tunnel braces 40.

  As a result, in the vehicle body floor portion structure 10, shearing of the vehicle body floor F (floor panel 14) is reduced, and the side impact load is reliably supported, so that the energy absorption portion 44 exhibits the required energy absorption performance. Thus, the energy absorption efficiency is improved and the deformation of the vehicle body is suppressed. In particular, in a CFRP automobile body B having low toughness compared to a metal material such as steel, for example, the body floor F is likely to be deformed due to shearing. However, deformation of the vehicle body floor F due to shearing is effectively suppressed.

  This point will be described in comparison with a vehicle body floor portion structure 100 according to a comparative example as shown in FIG. If a portion different from the vehicle body floor portion structure 10 is supplemented with respect to the vehicle body floor portion structure 100, the vehicle body floor portion structure 100 does not include the rear cross member 38 and is made of a CFRP made of a flat plate instead of the energy absorbing skeleton portion 46. The support plate 102 is provided, and the CFRP support plate 102 does not overlap the front cross member 36 in the longitudinal direction of the vehicle body. When a side collision of the pole P occurs in a vehicle to which the vehicle body floor structure 100 is applied, energy absorption is achieved by deformation of the energy absorbing portion 44, but the inwardly facing pole reaction force Rp and the outside in the lateral direction of the vehicle. Due to the inertial force Fi in the direction, energy absorption by shearing of the automobile body B made of CFRP proceeds. In the case of the vehicle body floor portion structure 100 in which the rear cross member 38 is not provided, the vehicle body floor F is likely to be deformed due to shear in the region Z shown in FIG. Measures are required.

  On the other hand, in the vehicle body floor portion structure 10, as shown in FIG. 7 by enclosing a structure different from the vehicle body floor portion structure 100 with a double frame, the energy absorption skeleton portion 46 is replaced with a closed cross-section portion 48 of the skeleton structure and an insert body. 50 (see configuration S1 in FIG. 7), the load input from the pole P to the energy absorbing portion 44 can be dispersed in the longitudinal direction of the vehicle body (operation A1 in FIG. 7, FIG. 3A). ) (See arrow F1). Thereby, the shear in the part corresponding to above-mentioned field Z in body floor F is reduced (refer to effect E1 of Drawing 7).

  The vehicle body floor structure 10 includes a rear cross member 38 (see configuration S2 in FIG. 7), and an energy absorbing skeleton 46 overlaps the rear cross member 38 and the front cross member 36 in the vehicle longitudinal direction. 7 (see configuration S3 in FIG. 7), in other words, the frame-like body 66 having a cross-sectional structure in a plan view is formed. Therefore, the frame-like body 66 is caused by a side collision load as shown in the action A2 in FIG. Is pushed (moved) inward in the vehicle width direction as a whole. That is, as in the vehicle body floor portion structure 100 according to the comparative example, an inertia force Fi opposite to the pole reaction force Rp is prevented from acting on the vehicle body floor F.

  As a result, as shown as action A3, the inward load in the vehicle width direction is directly transmitted from the energy absorbing skeleton 46 to the front cross member 36, the rear cross member 38, and the front and rear cross members 30 (FIG. 3 (A ) (See arrow F2), load transmission to the floor tunnel 16 side is effected (see action A4 in FIG. 7), and shear at the portion corresponding to the above-described region Z in the vehicle body floor F is reduced (as described above). (See effect E1 in FIG. 7).

  Further, the vehicle body floor portion structure 10 includes a plurality of tunnel braces 40 that connect a pair of tunnel side skeleton portions 20 arranged in parallel in the vehicle width direction (see configuration S4 in FIG. 7). The load transmitted to the tunnel side skeleton 20 by the action A <b> 2 that moves the state body 66 inward in the vehicle width direction as a whole is applied to the floor tunnel 16 via the plurality of tunnel braces 40 on the vehicle body on the opposite side to the vehicle width direction. The side impact load is also transmitted to the floor F in a short time (without undergoing deformation of the automobile body B) (see action A5 in FIG. 7 and arrow F3 in FIG. 3A).

  In the vehicle body floor structure 10, the side impact load is supported by the action A5 and the action A4 described above, and a good side by the energy absorbing part 44 until the CFRP energy absorbing part 44 is crushed. Absorption of impact energy is achieved (see effect E2 in FIG. 7). That is, the energy absorption efficiency by the energy absorbing portion 44 is improved, and deformation of the vehicle body, in particular, deformation due to shearing of the vehicle body floor F is effectively suppressed. Further, even when compared with measures for improving the shear strength of the (region Z) of the vehicle body floor F in the vehicle body floor portion structure 100, it is possible to effectively suppress vehicle body deformation while suppressing an increase in vehicle body mass.

  Therefore, the vehicle body floor portion structure 10 can effectively support the side impact load with respect to a local load input such as a side impact of the pole P, in other words, the energy absorbing portion 44. Inward movement in the vehicle width direction without deformation can be suppressed, and during the period until the energy absorbing portion 44 is crushed, collision energy is effectively absorbed while keeping the load high and suppressing vehicle body deformation. be able to.

  Here, in the vehicle body floor portion structure 10, the energy absorbing portion 44 of the energy absorbing member assembly 42 is formed in a corrugated plate shape. Therefore, the energy absorbing portion 44 can perform any of the above-described shock absorbing processes associated with its deformation. A load (reaction force) is generated in the stroke (over the period until it is crushed), and collision energy can be absorbed while maintaining the maximum load. That is, in the vehicle body floor structure 10, since the energy absorbing member assembly 42 having the energy absorbing portion 44 is used, the dimensions of the energy absorbing portion 44 in the vehicle width direction are effective with a short shock absorbing stroke within the range of the rocker 12. Can effectively absorb the collision energy, and the energy absorption efficiency is high. Moreover, since the energy absorbing member assembly 42 has a corrugated plate shape in which the energy absorbing portion 44 has a peak portion 44A and a valley portion 44B in a semicircular arc shape, the energy absorption efficiency and the reproducibility of the load at the time of collision are good. More specifically, since the peak portion 44A and the valley portion 44B are curved, the energy absorbing portion 44 is reliably deformed by an inward load in the vehicle width direction that is equal to or greater than a predetermined value and effectively absorbs energy. Even when a load is input from an oblique direction inclined with respect to the vehicle width direction, the load is distributed to adjacent portions in the longitudinal direction of the vehicle body via the peak portion 44A and the valley portion 44B. Accordingly, a sufficient load (reaction force) can be generated. Therefore, in the vehicle body floor portion structure 10 including the energy absorbing member assembly 42, the energy absorbing portion 44 is stably deformed (with good reproducibility) even when the load input direction is an oblique direction inclined with respect to the vehicle width direction. Energy absorption can be effectively achieved.

  Further, in the vehicle body floor portion structure 10, the energy absorbing member assembly 42 is disposed in the space 64 below the rib 60 in the rocker 12. In other words, the energy absorbing member assembly having a small size in the vertical direction of the vehicle body. Since energy can be effectively absorbed at 42 as described above, an increase in the mass of the automobile body B accompanying improvement in energy absorption performance can be suppressed. In addition, since the energy absorbing member assembly 42 is made of CFRP, an increase in the mass of the automobile body B is further suppressed. Further, the rib 60 regulates the posture change of the energy absorbing member assembly 42 in the space 64 of the rocker 12, so that the energy absorbing member assembly 42 is input to the rocker 12 by an inward load in the vehicle width direction that is a predetermined value or more. Sure deformation, that is, energy absorption is ensured. Further, by providing the ribs 60, the amount of urethane foam 65 used to hold the energy absorbing member assembly 42 in the space 64 of the rocker 12 is also small.

  Further, in the vehicle body floor structure 10, the rib 60 is continuous so as to form a straight line through the inner walls 56 and the upper walls 30 </ b> B, 36 </ b> A, 38 </ b> A of the cross member 30, the front cross member 36, and the rear cross member 38. Therefore, the inward load in the vehicle width direction input to the rocker 12 is efficiently transmitted to the floor tunnel 16 (the rocker 12 on the side opposite to the collision side). Particularly, since the energy absorbing member assembly 42 is disposed so as to overlap the cross member 30, the front cross member 36, and the rear cross member 38 in the vertical direction of the vehicle body, the peak is reduced by deformation of the rib 60 and the energy absorbing member assembly 42. The applied load is efficiently transmitted and distributed to the floor panel 14 and the floor tunnel 16 (the rocker 12 on the side opposite to the collision side).

  Furthermore, the energy absorbing member assembly 42 is arranged so as to include the entire range in which the seat can slide, and the pair of front and rear cross members 30 are provided corresponding to the range, so that it does not depend on the position of the side collision in the longitudinal direction of the vehicle body. , Occupants are effectively protected. In other words, the occupant is effectively protected against the pole side collision, and in particular, the occupant is effectively protected against the pole side collision from an oblique direction with respect to the vehicle width direction since the corrugated plate-shaped energy absorbing portion 44 is provided. Is done.

  As described above, in the vehicle body floor portion structure 10 in which the main portion (strength member) is made of CFRP, the energy absorption performance required for side collision (particularly, so-called pole side collision) can be secured. Thereby, the automobile body B can be reduced in weight while maintaining the collision performance by using CFRP having a specific gravity smaller than that of a metal material such as steel.

(Second Embodiment)
Next, a vehicle body floor portion structure 70 according to a second embodiment of the present invention will be described based on FIG. Note that parts and portions that are basically the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted, and illustration may be omitted.

  As shown in FIG. 8, the vehicle body floor structure 70 is different from the energy absorbing member assembly 42 having the energy absorbing skeleton portion 46 in that it includes an energy absorbing member 72 as an energy absorbing portion. This is different from the ten. The energy absorbing member 72 is configured (formed) in the same manner as the energy absorbing portion 44 except that the energy absorbing member 72 is not connected to the energy absorbing skeleton portion 46. That is, the energy absorbing member 72 includes a peak portion 44A, a trough portion 44B, an upper end 44C in the vertical direction of the vehicle body, a lower end 44D, a width direction one end 44E, and the other end 44F. , Lower end 72D, width direction one end 72E, and the other end 72F.

  The energy absorbing member 72 has one end 72 </ b> E in the width direction joined to a rocker inner skeleton wall 74 as a side vertical skeleton portion constituting the rocker 12. The inner skeleton wall 74 is provided in the rocker 12 and has a closed cross-sectional structure surrounded by the partition wall 76 that connects the upper wall 52 and the lower wall 54, the inner wall 56, the upper wall 52, and the lower wall 54. It is made. Although not shown, the rocker inner skeleton wall 74 is provided over substantially the entire length of the rocker 12 in the longitudinal direction of the vehicle body, and its front end overlaps the front cross member 36 so as to be able to transmit a load in the vehicle width direction. The end overlaps the rear cross member 38 so that a load can be transmitted in the vehicle width direction. Further, the internal space of the rocker inner skeleton wall 74 is filled with the insert body 50. The ribs 60 and 62 bridge between the outer wall 58 and the partition wall 76.

  The energy absorbing member 72 has one end 72 </ b> E in the width direction joined to the partition wall 76 of the rocker inner skeleton wall 74 to maintain the posture with respect to the rocker 12. The space 78 surrounded by the outer wall 58, the partition wall 76, the rib 60, and the lower wall 54 in the rocker 12 is filled with foamed urethane foam 65, whereby the energy absorbing member 72 assists the rocker 12. Is held. Other configurations of the vehicle body floor portion structure 70 are the same as the corresponding configurations of the vehicle body floor portion structure 10.

  Therefore, also by the vehicle body floor portion structure 70 according to the second embodiment, the same effect can be obtained by the same operation as the vehicle body floor portion structure 10 according to the first embodiment.

  In the second embodiment, the example in which the rocker inner skeleton wall 74 is provided between the upper wall 52 and the lower wall 54 has been described. However, the present invention is not limited to this, for example, the rib 60 and the lower wall. A structure in which a rocker inner skeleton wall is provided between the inner wall 54 and the outer wall 54 is also possible.

  Further, in each of the above-described embodiments, the energy absorbing portion 44 and the energy absorbing member 72 of the energy absorbing member assembly 42 have dimensions (lengths) in the longitudinal direction of the vehicle body that overlap the front cross member 36 and the rear cross member 38. However, the present invention is not limited to this. For example, the energy absorbing portion 44 and the energy absorbing member 72 may be configured to be located only within the sliding range of the seat frame 34 by the seat rail 32.

  Furthermore, in each of the above-described embodiments, an example in which the vehicle body floor structure 10, 70 is applied to a two-seat automobile body B is shown. However, the present invention is not limited to this, and has, for example, a front seat and a rear seat. Needless to say, the present invention may be applied to a vehicle or a vehicle having three rows of seats.

  Furthermore, in each of the above-described embodiments, the closed cross-section portion 48 of the energy absorption skeleton portion 46 and the internal space of the rocker inner skeleton wall 74 are filled and reinforced by the insert body 50. For example, the cross-sectional shape and thickness of the closed cross section 48 and the rocker inner skeleton wall 74 may be changed to obtain rigidity, or a structure provided with a reinforcing member such as a metal may be used.

1 is a perspective view showing an automobile body to which a vehicle body floor structure according to a first embodiment of the present invention is applied. It is the perspective view seen from the direction different from FIG. 1 which shows the motor vehicle body to which the vehicle body floor part structure which concerns on the 1st Embodiment of this invention was applied. (A) is a schematic plan view of the vehicle body floor part structure which concerns on the 1st Embodiment of this invention, (B) is a schematic top view of the vehicle body floor part structure which concerns on a comparative example. FIG. 4 is a front cross-sectional view taken along line 4-4 of FIG. It is a figure which shows the energy absorption member assembly which comprises the vehicle body floor part structure which concerns on the 1st Embodiment of this invention, Comprising: (A) is the perspective view seen from the vehicle width direction inside, (B) is the vehicle width direction outer side It is the perspective view seen from. FIG. 6 is a front cross-sectional view taken along line 6-6 in FIG. It is explanatory drawing for demonstrating the effect of the vehicle body floor part structure which concerns on the 1st Embodiment of this invention by the comparison with a comparative example. It is front sectional drawing corresponding to FIG. 4 which shows the vehicle body floor part structure which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

10 Car body floor structure 16 Floor tunnel (center vertical frame)
18 Tunnel body (tunnel part)
20 Tunnel side skeleton 34 Seat frame (seat for occupant seating)
36 Front cross member (front horizontal frame, horizontal frame)
38 Rear cross member (rear horizontal frame, horizontal frame)
40 Tunnel brace (connection member)
44 Energy absorption part 44A Mountain part 44B Valley part 46 Energy absorption skeleton part (side part vertical skeleton part)
48 Closed section (reinforcement)
50 Insert body 70 Car body floor part structure 72 Energy absorption member (energy absorption part)
74 Rocker inner skeleton wall (side vertical skeleton)

Claims (5)

A central vertical skeleton extending in the longitudinal direction of the vehicle at the center of the vehicle;
A side vertical skeleton that forms a closed cross-sectional structure and extends in the vehicle longitudinal direction at the outer end in the vehicle width direction;
A plurality of horizontal skeleton portions that extend in the vehicle width direction and connect the central vertical skeleton portion and the side vertical skeleton portion at at least two points spaced apart in the vehicle longitudinal direction;
An energy absorption part fixedly provided on the outer side in the vehicle width direction of the side part vertical skeleton part;
Body floor structure with The plurality of horizontal skeleton portions are a front horizontal skeleton portion positioned on the front side in the vehicle longitudinal direction with respect to the seat mounting portion for the occupant's seat, and a rear side frame positioned on the rear side in the vehicle longitudinal direction with respect to the seat mounting portion. Including a skeleton part,
The vehicle body floor structure according to claim 1, wherein the energy absorbing portion extends at least over the entire length of the seat installation range in the vehicle longitudinal direction.   3. The vehicle body floor according to claim 1, wherein the side vertical skeleton portion includes a closed cross-sectional portion made of fiber-reinforced plastic and a reinforcing portion provided in the closed cross-sectional portion. Construction.   The energy absorbing portion is made of fiber reinforced plastic, and is formed into a corrugated shape in which a peak portion protruding upward in the vehicle body vertical direction and a trough portion recessed upward in the vehicle body vertical direction are alternately continued in the vehicle longitudinal direction. The vehicle body floor structure according to any one of claims 1 to 3. The central vertical skeleton is
A tunnel portion raised from the floor so as to open downward in the vehicle body vertical direction,
The inner ends in the vehicle width direction of the plurality of horizontal skeleton portions respectively extending in the longitudinal direction of the vehicle body along the opening edges on both sides in the vehicle width direction of the tunnel portion, and positioned on the same side in the width direction with respect to the tunnel portion, respectively. A pair of connected tunnel side skeleton parts;
A plurality of connecting members extending in the vehicle width direction and connecting the tunnel side skeleton parts;
The vehicle body floor part structure according to claim 1, comprising: