JP5807706B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure having a floor portion and a standing wall portion.

  A vehicle body floor structure in which the main part of the body is constituted by CFRP is known (for example, see Patent Document 1). Moreover, the structure which formed the inclination part connected to a floor tunnel or the floor itself in a dash panel is known (for example, refer patent documents 2-4).

JP 2008-155700 A Japanese Patent Laid-Open No. 1-132474 Japanese Utility Model Publication No. 3-84286 JP 2003-285766 A

  However, the techniques described in the above-mentioned documents have room for improvement from the viewpoint of efficiently transmitting the load to the entire floor without collapsing the floor portion against the collision load.

  An object of the present invention is to obtain a vehicle body structure capable of efficiently transmitting a collision load from a standing wall portion to a skeleton structure of a floor portion.

  The vehicle body structure of the first aspect is formed in a rectangular shape in plan view, and is long in the vehicle front-rear direction with a flat lower wall and a part of the lower wall in the vehicle width direction provided on the upper side of the lower wall. A floor portion having a skeleton forming portion having a skeleton structure with a closed cross section, a floor standing in an upward direction from an end portion of the floor portion in the vehicle front-rear direction, the first wall, and the floor in the vehicle front-rear direction on the first wall A standing wall having a second wall facing from the side of the vehicle and having a closed cross-sectional structure extending in the vehicle width direction, the second wall being inclined with respect to the vehicle vertical direction and the front-rear direction in a side view, and the skeleton And an inclined wall that connects the lower wall and the upper wall facing each other in the forming portion.

  In the vehicle body structure of the first aspect, the skeleton structure is formed so as to protrude upward from the lower wall, and an end of the skeleton structure in the front-rear direction is an inclined wall that is connected to the second wall of the standing wall portion. The other end is connected. For this reason, the load in the front-rear direction input to the standing wall portion is transmitted to the skeletal structure (the upper wall) through the inclined wall in a state in which the falling of the standing wall portion is suppressed by the inclined wall.

  Thus, in the vehicle body structure of the first aspect, the collision load can be efficiently transmitted from the standing wall portion to the skeleton structure of the floor portion. Further, since the lower wall, that is, the lower floor of the vehicle is flat, the aerodynamic performance of the applied vehicle can be improved without relying on another member.

  A vehicle body structure according to a second aspect is the vehicle body structure according to the first aspect, wherein the inclined wall also serves as a lower part of the second wall in the vehicle vertical direction, and includes a first member including the lower wall and the first wall; The skeleton structure, the standing wall portion, and the inclined wall are formed by vertically joining the skeleton forming portion and the second member including the second wall.

  In the vehicle body structure of the second aspect, the inclined wall constitutes the lower part of the second wall and faces the first wall in the vehicle front-rear direction. Then, by overlapping the first member and the second member vertically, a floor portion having a partially skeleton structure is formed on the upper side of the flat lower wall, and the second wall including the first wall and the inclined wall is formed. An upright wall portion having a closed cross-sectional structure facing each other is formed. As a result, it is possible to configure a vehicle body structure that can efficiently transmit a collision load from the standing wall portion to the skeleton structure of the floor portion with a small number of parts.

  The vehicle body structure according to the third aspect is the vehicle body structure according to the first aspect or the second aspect, wherein at least a part of the support member that supports the wheel on the opposite side of the floor portion side in the vehicle front-rear direction with respect to the standing wall portion is the lower It is fixed on the wall.

  In the vehicle body structure of the third aspect, the support member that supports the wheel is fastened to at least the flat lower wall. For this reason, it is possible to receive the input load from the wheel as the shear of the lower wall, and since the skeletal structure is formed on the upper side of the lower wall, the structure received by bending the lower wall (the unevenness is formed on the lower wall Compared with the configuration, the out-of-plane deformation of the floor is effectively suppressed.

  The vehicle body structure according to a fourth aspect is the vehicle body structure according to any one of the first to third aspects, wherein a rod that penetrates a lower portion of the vertical wall portion in the vehicle vertical direction in the vehicle front-rear direction and the floor portion side of the rod A brake pedal connected to an end of the window, a reinforcing part formed on the inclined wall and fixed to a peripheral part of a window part through which the rod is inserted to reinforce the inclined wall, and the inclined part via the reinforcing part The brake pedal and the rod are fixed to a wall, have a recess projecting into the closed section of the standing wall portion in the window portion, and opening toward the floor portion side, at least when the brake pedal is operated And a receiving portion that positions the connecting portion in the recess.

  In the vehicle body structure of the fourth aspect, since the connecting portion between the brake pedal and the rod is arranged in the accommodating portion provided in the window portion of the inclined wall, the connecting portion is arranged on the floor portion side with respect to the inclined wall; In comparison, the rod length can be shortened. The inclined wall in which the window part is formed is reinforced by a fixing part fixed to the peripheral part of the window part, and required strength and rigidity are ensured. Moreover, the load transmission property from a standing wall part to frame structure is also ensured by the reinforcement part.

  A vehicle body structure according to a fifth aspect is the vehicle body structure according to any one of the first to fourth aspects, wherein the dash portion is erected upward from the front end portion of the floor portion in the vehicle front-rear direction as the standing wall; and Lower floor portions standing upward from a rear end portion in the vehicle front-rear direction of the floor portion are respectively provided, and the inclined wall is provided on at least one of the dash portion and the lower back portion.

  In the vehicle body structure of the fifth aspect, a dash portion as a standing wall portion is erected from the front side of the floor portion, and a lower back portion as a standing wall portion is erected from the front side of the floor portion. Since an inclined wall is formed on at least one of the dash part and the lower back part, the load of at least one of the frontal collision and the rearward collision can be efficiently transmitted to the skeleton structure of the floor part.

  As described above, the vehicle body structure of each aspect has an excellent effect that the collision load can be efficiently transmitted from the standing wall portion to the skeleton structure of the floor portion.

It is a figure which shows the principal part of the resin body structure which concerns on embodiment of this invention, Comprising: It is sectional drawing along the 1-1 line | wire of FIG. It is a perspective view which shows the underbody which comprises the resin body structure which concerns on embodiment of this invention. It is a disassembled perspective view of the underbody which comprises the resin body structure which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. It is a perspective view which shows the brake bracket which comprises the resin body structure which concerns on embodiment of this invention. 1 is a side sectional view showing a schematic configuration of an automobile to which a resin body structure according to an embodiment of the present invention is applied. It is a perspective view which shows the modification of the resin body structure which concerns on embodiment of this invention.

  A resin body structure 10 as a vehicle body structure according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in the drawing indicates a forward direction in the vehicle longitudinal direction, an arrow UP indicates an upward direction in the vehicle vertical direction, and an arrow W indicates a vehicle width direction. In the following description, when using the front-rear direction and the up-down direction, unless otherwise specified, the front-rear direction of the vehicle and the up-down direction of the vehicle are indicated.

  FIG. 7 is a sectional side view of the automobile V to which the resin body structure 10 is applied. As shown in this figure, the resin body structure 10 includes an underbody 12, a front suspension module 14, a front energy absorbing member (hereinafter referred to as "front EA member") 16, a rear suspension module 18, and a rear energy absorption. A member (hereinafter referred to as “rear EA member”) 20 is configured as a main part.

(Configuration of underbody)
The underbody 12 includes a floor portion 22 having a substantially rectangular shape in plan view, a dash lower portion 24 as a standing wall portion standing upward from the front end of the floor portion 22, and an upward standing from the rear end of the floor portion 22. The lower back part 26 as an upright wall part provided is comprised. The dash lower portion 24 and the lower back portion 26 have a length that extends over substantially the entire width of the floor portion 22, and form a substantially rectangular shape that is long in the vehicle width direction when viewed from the front.

  A front side wall 28 extends rearward from both ends of the dash lower portion 24 in the vehicle width direction, and a rear side wall 30 extends forward from both ends of the lower back portion 26 in the vehicle width direction. Each of the front side wall 28 and the rear side wall 30 has a lower end continuous to an outer end portion in the vehicle width direction of the floor portion 22 (a rocker 36 described later), and is separated from each other in the front-rear direction. As described above, the underbody 12 is formed in a bathtub shape as a whole (a bathtub shape in which a part of the side wall is cut out) as shown in FIG.

  Furthermore, as shown in FIG. 4, the floor portion 22 has a lower wall 32 that is flat along a substantially horizontal plane. Outer walls 34 are erected upward from both sides of the lower wall 32 in the vehicle width direction. On the upper side of the lower wall 32, a pair of left and right rockers 36 as a skeleton structure elongated in the front-rear direction and a center skeleton forming portion 38 are formed.

  The left and right rockers 36 include a lower wall 32, an upper wall 40 that is opposed to the lower wall 32 in the vertical direction, an outer wall 34, and an inner wall 42 that is opposed to the outer wall 34 in the vehicle width direction. A rectangular frame-shaped closed cross-sectional structure is formed. The center skeleton forming portion 38 has a rectangular frame-like closed cross-sectional structure in a front cross-sectional view including a lower wall 32, an upper wall 44 that is vertically opposite to the lower wall 32, and a pair of center side walls 46 that are opposite to each other. ing.

  In this embodiment, the upper wall 40 and the upper wall 44 have substantially the same facing distance (substantially flush) with the lower wall 32. That is, the height in the vertical direction is the same for the rocker 36 and the center skeleton forming portion 38. In this embodiment, the upper wall 40 and the inner wall 42 constituting the rocker 36 correspond to the skeleton forming portion, and the upper wall 44 and the pair of center side walls 46 constituting the center skeleton forming portion 38 correspond to the skeleton forming portion.

  As shown in FIG. 7, the dash lower portion 24 has a closed cross-sectional structure and bridges the left and right rockers 36 and the front end portions of the center skeleton forming portion 38. The lower back portion 26 has a closed cross-sectional structure and bridges the rear end portions of the left and right rockers 36 and the center skeleton forming portion 38.

  Specifically, the dash lower portion 24 includes a front wall 48 as a first wall facing the front and rear, a rear wall 50 as the second wall, and an upper wall 52 facing the lower wall 32. ing. That is, the dash lower portion 24 forms a closed cross-sectional structure with the lower wall 32, the front wall 48, the rear wall 50, and the upper wall 52 in a side sectional view. And in this embodiment, the lower part of the rear wall 50 which comprises the dash lower part 24 is made into the inclined wall 50S.

  The inclined wall 50S is inclined with respect to the front-rear (horizontal) direction so that the rear end side is located below the front end side, and the front upper end thereof is continuous with the lower end of the upper and lower walls 50V substantially along the vertical direction of the rear wall 50. doing. The vertical position of the front upper end (boundary portion with the vertical wall 50V) of the inclined wall 50S is substantially coincident with the vertical position of the center line (line passing through the centroid) CL of the front EA member 16 in a side view. Yes. On the other hand, the rear lower end of the inclined wall 50 </ b> S is continuous with the upper walls 40 and 44 facing the lower wall 32 in the formation site of the rocker 36 and the center skeleton forming portion 38. Further, the rear lower end of the inclined wall 50 </ b> S is continuous with an upper flange 12 </ b> UF (described later) joined to the lower wall 32 in a portion where the rocker 36 and the center skeleton forming portion 38 are not formed in the floor portion 22.

  Further, the lower back portion 26 is configured to include a rear wall 54 as a first wall and a front wall 56 as a second wall facing each other in the front-rear direction, and an upper wall 58 facing the lower wall 32. That is, the lower back portion 26 forms a closed cross-sectional structure in a side cross-sectional view with the lower wall 32, the rear wall 54, the front wall 56, and the upper wall 58. The rear wall 54 is inclined with respect to the front-rear (horizontal) direction as a whole so that the front end side is positioned below the rear end side.

  Furthermore, the floor portion 22 has a center cross portion 60 that bridges the left and right rockers 36 and the center skeleton forming portion 38 at a substantially central portion in the front-rear direction. The center cross portion 60 has a rectangular frame-like closed cross-sectional structure in a side cross-sectional view including a lower wall 32, an upper wall 62 facing the lower wall 32 in the vertical direction, and a front wall 64 and a rear wall 66 facing the front and rear. It is made.

  The underbody 12 described above is made of a resin material. As a resin material constituting the underbody 12, for example, a fiber reinforced resin containing reinforcing fibers such as carbon fiber, glass fiber, and aramid fiber may be used.

  The underbody 12 in this embodiment is configured by vertically joining a lower panel 12L as a first member and an upper panel 12U as a second member. Specifically, as shown in FIG. 3, the lower panel 12 </ b> L includes a lower wall 32, an outer wall 34, a front wall 48 of the dash lower portion 24, a rear wall 54 of the lower back portion 26, and an outer wall of the front side wall 28. 28A, 30 A of outer walls of the rear side wall 30, and lower flange 12LF projected outward from the peripheral part by planar view.

  On the other hand, the upper panel 12U includes an upper wall 40 and an inner wall 42 (skeleton forming portion) of the rocker 36, an upper wall 44 and a pair of center side walls 46 (skeleton forming portion) of the center skeleton forming portion 38, and a dash lower portion 24. Rear wall 50 (upper and lower walls 50V, inclined wall 50S) and upper wall 52, front wall 56 and upper wall 58 of lower back portion 26, upper wall 62, front wall 64 and rear wall 66 of center cross portion 60, front It includes an inner wall 28B of the side wall 28, an inner wall 30B of the rear side wall 30, and an upper flange 12UF that projects outward from the peripheral edge in plan view. The upper flange 12UF includes an inner wall 42, a center side wall 46, an inclined wall 50S (a rocker 36, a non-formation part of the center skeleton formation part 38), a front wall 56 (a rocker 36, a non-formation part of the center skeleton formation part 38), the front It is also formed at each lower end of the wall 64 and the rear wall 66.

  The underbody 12 is bonded to the lower panel 12L and the upper panel 12U by the lower flange 12LF and the upper flange 12UF, and the upper flange 12UF and the lower wall 32 are bonded to each other. It has a closed cross-sectional structure. In this embodiment, the front side wall 28 forms a closed cross-sectional structure with the outer wall 28A and the inner wall 28B, and the rear side wall 30 forms a closed cross-sectional structure with the outer wall 30A and the inner wall 30B. The upper panel 12U and the lower panel 12L may be joined by fusion or welding.

(Configuration of brake pedal mounting part)
A pedal bracket 70 to which a brake pedal 68 is attached is fixed to the dash lower portion 24. Specifically, the pedal bracket 70 is an inclined wall 50S and is arranged so that at least a part in the vehicle width direction (at least a part of a pocket 70P described later in the vehicle width direction) overlaps the rocker 36 in a front view. Has been. This will be specifically described below.

  As shown in FIGS. 3 and 5, the inclined wall 50 </ b> S is formed with a window portion 50 </ b> W for passing a rod 72 connected to the brake pedal 68. Further, the front wall 48 is formed with a window portion 48W for allowing the rod 72 to pass therethrough. A master cylinder 76 as a hydraulic pressure generator is fixed to the front surface of the front wall 48 via a bracket 74. Although not shown, the master cylinder 76 is accommodated in a suspension member 80 described later. The rod 72 connects the brake pedal 68 and the master cylinder 76, and transmits the displacement of the brake pedal 68 to the master cylinder 76 in order to generate a required hydraulic pressure in the master cylinder 76.

  The pedal bracket 70 is made of a metal material such as steel, stainless steel, and aluminum (alloy), and as shown in FIGS. 5 and 6, the pedal bracket 70 has a rectangular shape as a reinforcing portion fixed to the peripheral portion of the window portion 50 </ b> W in the inclined wall 50 </ b> S. A frame-shaped flange 70F and a pocket portion 70P as an accommodating portion provided inside the flange 70F are mainly configured. The flange 70F is fixed to the inclined wall 50S at a plurality of locations in the circumferential direction by fastening, and reinforces the peripheral portion of the window portion 50W in the inclined wall 50S.

  The pocket portion 70P protrudes into the closed cross section of the dash lower portion 24 and opens to the vehicle compartment (floor portion 22) side, and has a substantially L shape in a side cross sectional view shown in FIG. More specifically, the front portion of the pocket portion 70P is substantially parallel to the front wall 48, and the rear portion of the pocket portion 70P is substantially parallel to the lower wall 32. As shown in FIG. 5, a metal collar 75 is interposed between the front wall 48 of the opposing dash lower portion 24 and the front portion of the pocket portion 70P of the pedal bracket 70 (four in this embodiment). ), The relative displacement between the pedal bracket 70 and the bracket 74 is restricted (suppressed small) by a fastening member including a bolt 71A inserted through each collar 75 and a nut 71B screwed into the bolt 71A.

  The pedal bracket 70 has a hinge portion 70H that supports the lower end of the brake pedal 68 so as to be rotatable about an axis along the vehicle width direction. In the resin body structure 10, 68 supported by the hinge portion 70H and connected to the rod 72 is configured such that the connecting portion J with the brake pedal 68 is located in the pocket portion 70P.

  An imaginary line in FIG. 5 shows an opening surface 70A of the pedal bracket 70 that substantially coincides with the inclined surface of the inclined wall 50S, and the connecting portion J is located on the bottom 70B side of the pedal bracket 70 with respect to the opening surface 70A. It is supposed to be configured. In this embodiment, the connecting portion J is configured such that the brake pedal 68 is not operated, that is, is always located in the pocket portion 70P. The connecting portion J may be configured to be positioned in the pocket portion 70P in an operation (depressed) state of at least a predetermined amount of the brake pedal 68.

(Configuration of suspension module)
The front suspension module 14 includes at least a suspension member 80 as a support member and a pair of left and right front suspensions (not shown). The suspension member 80 as a support member is elongated in the vehicle width direction and has a closed cross-sectional structure in a side cross-sectional view as shown in FIG.

  Although not shown, the suspension member 80 supports the front wheels Wf (see FIG. 7) via the front suspension so as to be steerable. In this embodiment, the suspension member 80 is assembled with the left and right front suspensions as a whole. That is, each front suspension is supported by the suspension member 80 so as to function independently without depending on other parts constituting the vehicle body of the automobile V.

On the other hand, the rear suspension module 18 includes at least a suspension member 84 as a support member and a pair of left and right rear suspensions (not shown). The suspension member 84 as a suspension support member is elongated in the vehicle width direction as shown in FIGS. 3 and 7, and has a closed cross-sectional structure in a side sectional view as shown in FIG.
The suspension member 84 is supported via a rear suspension so that the rear wheel Wr can rotate. In this embodiment, the suspension member 84 is assembled with the left and right rear suspensions as a whole. That is, each rear suspension is supported by the suspension member 84 so as to function independently without depending on other parts constituting the vehicle body of the automobile V.

  Furthermore, a wheel-in motor is built in the rear wheel Wr. The rear suspension module 18 is assembled with a battery (not shown) for driving the wheel-in motor and a PCU (power control unit) as a control device. That is, the rear suspension module 18 can be regarded as a drive unit of the automobile V.

  As shown in FIGS. 1 and 7, the front suspension member 80 is fixed to the dash lower portion 24 by fastening and is fixed to the lower wall 32 by fastening. Specifically, the suspension member 80 has its main body portion 80M fastened and fixed to the front wall 48 of the dash lower portion 24 at the fastening portion F1 at a plurality of locations in the vehicle width direction. In addition, the suspension member 80 has a fastening portion F2 at a plurality of locations in the vehicle width direction at a plurality of locations in the vehicle width direction with flanges 80F extending rearward from the corners of the rear lower end of the main body portion 80M overlapped with the lower surface of the lower wall 32. The lower wall 32 (the portion constituting the dash lower portion 24) is fastened and fixed.

  As shown in FIG. 7, the rear suspension member 84 is fastened to the lower back portion 26 and fastened to the lower wall 32 by fastening. Specifically, the suspension member 84 has its main body portion 84M fastened and fixed to the rear wall 54 of the lower back portion 26 at the fastening portion F3 at a plurality of locations in the vehicle width direction. In addition, the suspension member 84 has a fastening portion F4 at a plurality of locations in the vehicle width direction at a plurality of locations in the vehicle width direction with a flange 84F extending forward from the corner portion of the front lower end of the main body portion 84M being superimposed on the lower surface of the lower wall 32. The lower wall 32 (the portion constituting the lower back portion 26) is fastened and fixed.

(Configuration of EA member)
The front EA member 16 is a large component that is elongated in the vehicle width direction. Specifically, the front EA member 16 has a length in the vehicle width direction of the front surface of the suspension member 80, that is, a length along the vehicle width direction substantially equal to the distance between the left and right front suspensions. The front EA member 16 in this embodiment has a box shape (substantially rectangular box shape) that opens rearward. The front EA member 16 is fastened and fixed to the suspension member 80 at a flange 16F protruding from its rear end. The front EA member 16 may be fastened and fixed (jointly fastened) to the dash lower portion 24 together with the suspension member 80.

  Similarly, the rear EA member 20 is a large component that is elongated in the vehicle width direction. Specifically, the rear EA member 20 has a length in the vehicle width direction of the front surface of the suspension member 84, that is, a length along the vehicle width direction substantially equal to the distance between the left and right rear suspensions. The rear EA member 20 in this embodiment has a box shape (substantially rectangular box shape) that opens forward. The rear EA member 20 is fastened and fixed to the suspension member 84 at a flange 20F protruding from the front end thereof. The rear EA member 20 may be fastened and fixed (co-fastened) to the lower back portion 26 together with the suspension member 84.

  Each of the front EA member 16 and the rear EA member 20 described above is integrally formed of a resin material. As a resin material constituting the front EA member 16 and the rear EA member 20, for example, a fiber reinforced resin containing reinforcing fibers such as carbon fiber, glass fiber, and aramid fiber may be used. Further, the front EA member 16 and the rear EA member 20 may be made of a metal material such as aluminum or an alloy thereof.

  Next, the operation of this embodiment will be described.

  The automobile V to which the resin body structure 10 having the above-described configuration is applied is supplied with electric power from the PCU built in the suspension member 84 to the wheel-in motor and travels by the driving force of the wheel-in motor. In the automobile V, the wheel-in motor functions as a generator according to the operation of the brake pedal 68, and power is recovered (regenerated) to the battery via the PCU. Further, in the automobile V, the front wheel Wf supported via the front suspension is steered according to the steering wheel.

  When a frontal collision of the automobile V occurs, a collision load is input to the front EA member 16. By this load, the front EA member 16 is compressed and deformed, and the load (support reaction force) is transmitted to the suspension member 80 while absorbing impact energy (dynamic load). At this time, in the resin body structure 10, the collision load input to the front EA member 16 is received by the wide surface of the suspension member 80 (front wall long in the vehicle width direction), and the front EA member 16 is stably axially compressed and deformed. Is done. The load transmitted to the suspension member 80 is transmitted to the floor portion 22 via the dash lower portion 24.

  Here, in the resin body structure 10, since the lower part of the rear wall 50 constituting the dash lower portion 24 is the inclined wall 50 </ b> S, the load of the frontal collision can be efficiently transmitted to the floor portion 22. This point will be supplemented below.

  The underbody 12 having the dash lower portion 24 and the floor portion 22 is configured such that the lower end of the dash lower portion 24, which is a vertically long beam, is elastically elastic in the direction in which the dash lower portion 24 is tilted (rearly tilted). ) Is considered as a model connected to the front end. In this model, in order to efficiently transmit the load from the dash lower portion 24 to the floor portion 22, it is desirable that the bending rigidity of the dash lower portion 24 as a beam is higher and the rigidity (elastic coefficient) of the connecting portion is higher. Is desirable.

  And in the resin body structure 10. Since the dash lower portion 24 has a closed cross-sectional structure of the front wall 48, the rear wall 50, the lower wall 32, and the upper wall 52, the beam of the dash lower portion 24 is compared with a dash lower portion made of a single plate. Bending rigidity is high. Further, since the lower portion of the rear wall 50 is an inclined wall 50S, the closed cross section constituting the dash lower portion 24 is wide at the lower portion. Thereby, compared with a dash lower portion made of a single plate or a dash lower portion having a substantially constant width in the side view, the connecting portion between the dash lower portion 24 and the floor portion 22 has an elastic modulus in the above-described collapse direction. Is expensive.

  Further, in the resin body structure 10, the vertical position of the front upper end of the inclined wall 50S is substantially coincident with the vertical position of the center line CL of the front energy absorbing member 16 in a side view, and the rear lower end of the inclined wall 50S is upper. It is continuous with the walls 40 and 44. For this reason, the load input from the front energy absorbing member 16 to the dash lower portion 24 is efficiently transmitted to the rocker 36 and the center skeleton forming portion 38 of the floor portion 22. That is, the load (moment for tilting the dash lower portion 24 backward) can be efficiently transmitted to the rocker 36 and the center skeleton forming portion 38 as the axial force of the inclined wall 50S.

  In the resin body structure 10, a pedal bracket 70 that supports the brake pedal 68 has a connecting portion J between the brake pedal 68 and the rod 72 inserted in the pedal bracket 70. For this reason, the rod 72 can be shortened by ΔL shown in FIG. 5 as compared with the comparative example in which the connecting portion J is disposed on the inclined wall 50S as indicated by the imaginary line in FIG. As a result, the strength required for the rod is low compared with the above comparative example, and measures required for the comparative example such as increasing the strength of the material constituting the rod 72 and expanding the outer diameter of the rod 72 are unnecessary. It can be.

  And in the resin body structure 10, the window part 50W is formed in the inclined wall 50S in order to shorten the rod 72 as mentioned above. Here, the flange 70F of the pedal bracket 70 is fixed to the peripheral edge portion of the window portion 50W in the inclined wall 50S, thereby reinforcing the inclined wall 50S. For this reason, the load accompanying the frontal collision from the dash lower portion 24 is transmitted to the rocker 36 via the inclined wall 50S and the flange 70F in the installation range of the pedal bracket 70 in the vehicle width direction. Further, a part of the load from the dash lower portion 24 is transmitted to the rocker 36 through the inclined wall 50S and the pocket portion 70P. As described above, in the resin body structure 10, the strength reduction of the rear wall 50 (dash lower portion 24) alone due to the formation of the window portion 50 </ b> W is eliminated by providing the pedal bracket 70.

  Moreover, when the structure which forms the recessed part equivalent to the pocket part 70P integrally in the inclined wall 50S is employ | adopted, the underbody 12 will be made separately with a left-hand drive vehicle and a right-hand drive vehicle. On the other hand, in the resin body structure 10, the pedal bracket 70 can be attached by opening the window 50 </ b> W after the underbody 12 is molded. In this configuration, it is not necessary to make the underbody 12 separately between the left-hand drive vehicle and the right-hand drive vehicle.

  Here, in the resin body structure 10, the lower wall 32 of the floor portion 22 is formed flat. The suspension member 80 is fastened and fixed to the lower wall 32 at the flange 80F. Similarly, the suspension member 84 is fastened and fixed to the lower wall 32 at the flange 84F. Therefore, the load in each direction transmitted from the front wheel Wf and the rear wheel Wr to the suspension members 80 and 84 is received by the lower wall 32 as a share (shear).

  For example, in a comparative example in which a tunnel opening on the road surface side is formed at the center in the vehicle width direction of the floor, the floor panel is deformed (bend deformation) in a direction in which the opening width of the tunnel is expanded or contracted. The load from the rear wheel Wr cannot be received by the share of the floor panel.

  In contrast, in the resin body structure 10, the load from the front wheel Wf and the rear wheel Wr can be received by the lower wall 32 as a share as described above. In addition, since the rocker 36 and the center skeleton forming portion 38 are formed on the upper side of the lower wall 32, out-of-plane deformation of the lower wall 32 due to loads from the front wheel Wf and the rear wheel Wr is effectively suppressed. As a result, the resin body structure 10 contributes to an improvement in the handling stability of the automobile V.

  Further, in the floor portion 22 in which the rocker 36 and the center skeleton forming portion 38 are formed on the upper side of the lower wall 32, the lower wall 32 becomes the tension side and the upper walls 40 and 44 side become the compression side in the case of a frontal collision. To bend around the axis along the vehicle width direction. Here, since the ridgeline between the upper wall 40 and the inner wall 42 and the ridgeline between the upper wall 44 and the center side wall 46 are formed on the compression side, compared with the configuration in which the floor portion 22 is turned upside down, High strength against bending (high proof stress). That is, it is reasonable to make the lower wall 32 flat with respect to a frontal collision.

  Then, by flattening the lower wall 32, the underfloor of the automobile V is flattened, and a rectifying action under the underfloor is obtained. This improves the aerodynamic performance of the automobile V to which the resin body structure 10 is applied without depending on aerodynamic parts and the like. In addition, compared with a configuration in which separate aerodynamic parts are provided in order to obtain equivalent aerodynamic performance, there are advantages in reducing the number of parts and reducing the weight.

  In the above-described embodiment, the example in which the inclined wall 50S is also formed between the rocker 36 and the center skeleton forming portion 38 is shown, but the present invention is not limited to this, and for example, shown in FIG. As described above, the inclined wall 50 </ b> S may not be formed in the portion between the rocker 36 and the center skeleton forming portion 38 in the dash lower portion 24.

  In the above-described embodiment, an example in which the inclined wall 50S is formed in the dash lower portion 24 has been described. However, the present invention is not limited to this, for example, in addition to the above configuration or instead of the above configuration, a standing wall An inclined wall may be provided below the front wall 56 of the lower back portion 26 as a portion so that the rear impact load is efficiently transmitted to the rocker 36 and the center skeleton forming portion 38.

  Furthermore, in the above-described embodiment, the example in which the inclined wall 50S constitutes the lower part of the rear wall 50 has been shown. However, the present invention is not limited to this, and for example, the inclined wall 50S has the rear wall 50 (the lower wall 50V below the upper wall 50V). It is also possible to connect the middle part of the one extended to the wall 32 and the upper walls 40, 44. That is, the upper panel 12U is not limited to a structure that is integrally formed as a whole, and may be configured by joining a plurality of members as long as each part is integrated before joining to the lower panel 12L. good. Similarly, the lower panel 12L is not limited to a structure that is integrally formed as a whole, and it is only necessary that the respective parts are integrated before joining to the upper panel 12U.

  In addition, it goes without saying that the present invention is not limited to the specific configuration in the above-described embodiment, and can be implemented with various modifications.

10 Resin body structure (body structure)
12 Underbody (body structure)
12L Lower panel (first member)
12U Upper panel (second member)
22 Floor part 24 Dash lower part (standing wall part)
26 Lower back (standing wall)
32 Lower wall 36 Rocker (skeleton structure)
38 Center skeleton formation part (skeleton structure)
40 Upper wall (skeleton forming part)
42 Inner wall (skeleton forming part)
44 Upper wall (skeleton forming part)
46 Center side wall (skeleton forming part)
48 Front wall (1st wall)
50 Rear wall (second wall)
50S inclined wall 50W window part 54 rear wall (first wall)
56 Front wall (second wall)
68 Brake pedal 70 Pedal bracket 70F Flange (reinforcement part)
70P pocket part (recess, storage part)
72 Rod 80 Suspension member (support member)
84 Suspension member (support member)

Claims (4)

A skeleton formed in a rectangular shape in a plan view and having a flat bottom wall and a part of the lower wall in the vehicle width direction that is long in the vehicle longitudinal direction and has a closed cross-sectional skeleton structure A floor portion having a forming portion;
A first wall, and a second wall facing the first wall from the floor portion side in the vehicle front-rear direction. A standing wall portion in which the wall and the second wall are spaced apart from each other;
An inclined wall that is inclined with respect to the vehicle vertical direction and the front-rear direction in a side view, and connects the second wall and the upper wall facing the lower wall in the skeleton forming portion ;
With
As the standing wall portion, a dash lower portion erected upward from a front end portion of the floor portion in the vehicle front-rear direction, and a lower back portion erected upward from a rear end portion of the floor portion in the vehicle front-rear direction, respectively. Provided,
The inclined wall is a vehicle body structure provided on at least one of the dash lower portion and the lower back portion. At least one of the dash lower portion and the lower back portion is configured to have an upper and lower wall substantially along the vehicle vertical direction and the inclined wall,
The vehicle body structure according to claim 1, wherein the inclined wall has a front upper end continuous with a lower end of the upper and lower walls and a rear lower end continuous with a non-formation portion of the skeleton structure in the floor portion. The inclined wall is
The second wall is composed of a separate member,
3. The vehicle body structure according to claim 1, wherein an intermediate portion of the second wall in the vehicle vertical direction is connected to the skeleton forming portion.   The said floor part, the said dash lower part, and the said lower back part are vehicle body structures in any one of Claims 1-3 comprised by the resin material.

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