JP2010167818A - Lower vehicle body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively absorb collision energy acting when a vehicle collides, by effectively improving rigidity in a vehicle body with a simple constitution. <P>SOLUTION: This lower vehicle body structure of the vehicle has a pair of right-left front side frames 2 and 2 extending to the front side of the vehicle from an installation part of a dash panel 1, a floor panel 3 for forming a bottom surface part of a cabin, and a tunnel part 4 of swelling a central part in the vehicle width direction of this floor panel 3 to the cabin inside. A side sill 7 of a closed cross-sectional shape of extending in the longitudinal direction of the vehicle, is arranged in both side parts in the vehicle width direction of the floor panel 3, and a torque box 32 of a closed cross-sectional shape of extending along the dash panel 1, is arranged so as to connect a front part of this side sill 7 and a rear end part of the front side frames 2. This torque box 32 is slantingly arranged so as to be positioned on the rear side of the vehicle body as its rear side part approaches the side sill 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement in a lower body structure of a vehicle including a pair of left and right front side frames and a tunnel portion installed at a center portion in the vehicle width direction of a floor panel.

  Conventionally, as shown in Patent Document 1 below, the front side provided on the left and right sides of the vehicle body front portion with the center line in the vehicle width direction is provided for the purpose of increasing the rigidity of the vehicle body while suppressing an increase in the weight of the vehicle body Frame, rear side frame provided on the left and right sides of the vehicle width direction center line at the rear of the vehicle body, and left and right sides of the vehicle width direction center line lower than the front side frame and rear side frame when the vehicle body is viewed from the side A floor tunnel having a lower open U-shaped cross-section structure that is connected to the floor frame or the side sill and projects above the floor frame or the side sill along the center line in the vehicle width direction between the front side frame and the rear side frame. In the vehicle body structure provided, an auxiliary frame having a closed cross-sectional structure is provided above the floor tunnel, and the auxiliary frame is attached to the frame. It has been performed to bond the extension of the closed cross section in the cement side frames and said rear side frame.

  Further, as shown in Patent Document 2 below, a floor panel provided to form a floor surface of a passenger compartment for the purpose of improving the bending rigidity and torsional rigidity of the vehicle body to such an extent that it can be applied to an open car. A cowl box provided at a position above the front end of the floor panel in the vehicle longitudinal direction so as to extend in the vehicle width direction, and the floor panel and the cowl box are connected to each other, and an upper end flange is provided on the cowl box. A joined dash panel, a tunnel portion provided on the floor panel so as to extend rearward from the center of the dash panel in the vehicle width direction, and provided so as to extend in the vehicle front-rear direction and line up in the vehicle width direction. In the lower body structure of an automobile equipped with a pair of left and right side frames, so as to straddle the tunnel portion along the dash panel The dash cross member that forms a closed cross-section in cooperation with the dash panel, and is provided to extend in the vehicle width direction. A rear cross member that connects the rear portions located at the rear of the vehicle compartment of both side frames and a vehicle that extends in the vehicle front-rear direction along the tunnel portion, and forms a closed section in cooperation with the tunnel portion. A tunnel reinforcement that connects the front end side of the tunnel reinforcement to the center in the vehicle width direction of the dash cross member, and the rear end side is connected to the center of the rear cross member in the vehicle width direction. Are known.

JP 2000-238667 A JP 09-118252 A

  As disclosed in Patent Document 1 above, when the auxiliary frame having a closed cross-sectional structure provided at the upper portion of the floor tunnel is connected to the front side frame and the rear side frame by an extension of the closed cross-sectional structure, respectively. Transmits the collision energy input to the front side frame at the time of a frontal collision of the vehicle from the auxiliary frame at substantially the same height as the front side frame to the rear side frame. There is an advantage that collision energy can be absorbed efficiently. However, the vehicle body structure disclosed in Patent Document 1 cannot effectively absorb the collision energy transmitted to the lower part of the vehicle body and cannot sufficiently improve the vehicle body rigidity. is there.

  Also in Patent Document 2, the floor tunnel is connected by connecting the left and right side sills, the side frames, and the tunnel top reinforcement installed on the upper surface of the floor tunnel portion via the center cross member installed on the floor pal. Although the structure which reinforces the upper part of a part is disclosed, also in this structure, there exists a problem that the collision energy transmitted to the vehicle body lower part cannot be absorbed effectively.

  The present invention has been made in view of the above problems, and by effectively improving the rigidity of the vehicle body with a simple configuration, it is possible to effectively absorb the collision energy that acts when the vehicle collides. The purpose is that.

  According to a first aspect of the present invention, there is provided a dash panel installed so as to partition the front part of the vehicle compartment and the engine room, a pair of left and right front side frames extending from the installation part of the dash panel to the front side of the vehicle, and the dash Installed to extend in the front-rear direction of the vehicle body by bulging the floor panel in the vehicle width direction of the floor panel that forms the bottom surface of the vehicle compartment continuously to the lower end of the panel and the vehicle width direction of this floor panel A vehicle lower body structure provided with a tunnel portion, wherein both side portions of the floor panel in the vehicle width direction are provided with side sills having a closed cross section extending in the front-rear direction of the vehicle, and a front portion of the side sill A torque box having a closed cross-sectional shape extending along the dash panel so as to connect the rear end portion of the front side frame is provided. Are those in which the subsequent side portions disposed inclined so as to be positioned on the rear side of the vehicle body toward the side sill.

  According to a second aspect of the present invention, in the lower body structure of the vehicle according to the first aspect, the torque box is configured by a box-like member installed along the lower surface of the dash panel.

  According to a third aspect of the present invention, in the lower body structure of the vehicle according to the first or second aspect, a dash lower portion that extends in the front-rear direction of the vehicle is provided at a lower end portion of the dash panel in an upwardly inclined state. In addition, the front end portion of the floor panel is connected to the rear end portion, and the outer end portion of the rear wall of the torque box extends to a position beyond the rear end of the dash lower portion.

  The invention according to claim 4 is the vehicle lower body structure according to any one of claims 1 to 3, wherein the rear end of the side sill is disposed at the left and right of the rear of the vehicle. It is connected to the part.

  The invention according to claim 5 is the vehicle lower body structure according to any one of claims 1 to 4, wherein the floor extends from the rear end portion of the front side frame to the rear side of the vehicle along the floor panel. It has a frame, and the torque box is connected to the front part of the floor frame.

  According to a sixth aspect of the present invention, in the lower body structure of the vehicle according to the fifth aspect of the invention, the floor frame is installed so as to be inclined so that a rear portion thereof is directed outward in the vehicle width direction. The rear side of the floor frame is connected to the front end of the rear side frame.

  In the invention according to claim 1, the torque box having a closed cross-sectional shape provided so as to extend along the dash panel connects the front portion of the side sill and the rear end portion of the front side frame, and Since the side part is inclined so as to be located on the rear side of the vehicle body as it approaches the side sill, the transmission direction of the collision energy input from the front side frame to the torque box during the frontal collision of the vehicle The collision energy can be smoothly transmitted to the side sill by converting to the rear outward side. Therefore, there is an advantage that the collision energy input from the front side frame to the lower part of the vehicle body can be dispersed throughout the vehicle body and effectively supported at the time of the vehicle front collision.

  In the invention according to claim 2, the torque box formed by inclining the rear side portion so as to be positioned on the rear side of the vehicle body as it approaches the side sill is configured by a box-shaped member installed along the lower surface of the dash lower portion. For this reason, the torque box having the above-described shape is disposed without causing any adverse effects such as narrowing of the vehicle interior space due to the torque box being installed in a state of protruding into the vehicle interior. It is possible to effectively improve the rigidity of the vehicle body.

  In the invention which concerns on Claim 3, the lower part of a vehicle by which the dash lower part extended in the front-back direction of a vehicle is provided in the lower end part of the dash panel at the front rising direction, and the front-end part of the said floor panel is connected to the rear-end part. In the vehicle body structure, the outer end portion of the rear wall of the torque box extends to a position beyond the rear end of the dash lower portion, so that the vicinity of the dash lower portion is deformed according to the collision energy input at the time of the front collision of the vehicle. This can be effectively prevented by the torque box, and the collision energy can be efficiently transmitted to the side sill via the torque box.

  In the invention according to claim 4, since the rear end portion of the floor frame is connected to the vicinity of the rear end portion of the side sill having a closed cross-sectional shape disposed on both sides of the floor panel in the vehicle width direction. By using the side sill as a support member for supporting the collision energy input from the side frame to the floor frame, the rigidity of the vehicle body against the frontal impact load of the vehicle can be more effectively improved with a simple configuration.

  In the invention according to claim 5, since the torque box is connected to the front portion of the floor frame installed so as to extend from the rear end portion of the front side frame along the floor panel to the rear side of the vehicle, Since the collision energy input to the front side frame can be efficiently transmitted from the torque box to the side sill and floor frame at the time of a front collision, there is an advantage that the collision energy can be supported more effectively. is there.

  In the invention according to claim 6, the floor frame is installed so as to extend from the rear end portion of the front side frame to the rear side of the vehicle body, and the rear portion of the floor frame is inclined toward the outer side in the vehicle width direction. Since the rear end portion of the floor frame is connected to the front end portions of the rear side frames disposed on the left and right sides of the rear portion, the collision energy input from the front side frame to the floor frame is transmitted to the rear side frame at the time of frontal collision of the vehicle. Thus, the vehicle can be supported stably, and the rigidity of the vehicle body against the front impact load of the vehicle can be effectively improved with a simple configuration.

It is a top view which shows embodiment of the lower vehicle body structure of the vehicle which concerns on this invention. It is a top view which shows the specific structure of a lower body frame. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a top view which shows the installation state of a passenger | crew seat. It is a side view which shows the installation state of a passenger | crew seat. It is front sectional drawing which shows the attachment state of a seat slide rail. It is a top view which shows the footrest part of the passenger | crew who seated on the backseat seat.

  1 to 4 show an embodiment of a lower body structure of a vehicle according to the present invention. The lower vehicle body structure includes a dash panel 1 installed so as to partition a vehicle compartment front portion and an engine room, and a pair of left and right front side frames 2, 2 extending from the installation portion of the dash panel 1 to the front side of the vehicle. The floor panel 3 that continuously forms the bottom surface of the passenger compartment continuously from the lower end of the dash panel 1 and the center of the floor panel 3 in the vehicle width direction are bulged toward the interior (upward) of the vehicle body. A tunnel portion 4 extending in the front-rear direction, and tunnel reinforcements 4a, 4a having a closed cross-sectional shape are installed on the upper left and right sides of the tunnel portion 4 so as to extend in the front-rear direction of the vehicle body. (See FIG. 4).

  A pair of left and right floor frames 5, 5 extending in the front-rear direction of the vehicle body are provided on the lower surface of the floor panel 3 so as to be continuous with the rear ends of the front side frames 2, 2. A floor subframe 6 extending from the middle portion in the direction toward the lower side of the tunnel portion 4 toward the inner side in the vehicle width direction and extending toward the rear side of the vehicle is disposed. Further, side sills 7 and 7 having an outer panel 7a and an inner panel 7b are disposed on both sides of the floor panel 3 in the vehicle width direction. The side end flange portion 3a of the panel 3 is fixed by spot welding or the like.

  As shown in FIG. 3, the dash panel 1 includes a dash upper portion 1a installed so as to extend downward from a lower surface of a cowl box (not shown), and a dash lower portion 1b continuously provided at a lower end portion thereof. have. The dash lower portion 1b is installed so as to extend in the front-rear direction of the vehicle in an upwardly inclined state, and the front end flange portion 3b of the floor panel 3 is connected to the rear end portion thereof.

  The front side frame 2 is located at the front side of the vehicle at a position located on the inner side in the vehicle width direction by a predetermined distance from the side wall surface of the vehicle in order to secure a space for installing a front wheel suspension member (not shown). A front portion 2a installed so as to extend substantially linearly, and a rear portion 2b installed so as to extend rearwardly downward from the rear end portion thereof. A front cross member 8 is installed at the front ends of the left and right front side frames 2 and 2 so as to extend in the vehicle width direction.

  As shown in FIG. 4, the floor frame 5 includes a pair of left and right side walls 5a and 5a, a bottom wall portion 5b installed between lower ends thereof, and left and right sides connected to upper ends of the side walls 5a and 5a. The pair of joint flange portions 5c, 5c are formed in a hat shape in cross section. The floor frame 5 is spot welded to the lower surface of the floor panel 3 in a state where the floor frame 5 is installed so as to extend from the rear end of the front side frame 2 to the rear side of the vehicle body. It is fixed by. In addition, the floor frame 5 is installed so as to be inclined so that its rear portion is directed outward in the vehicle width direction in the plan view shown in FIG. It is connected to the front end portions of the rear side frames 9 and 9 and the vicinity of the rear end portion of the side sill 7.

  The rear side frame 9 is disposed from the rear end of the vehicle body at a position located on the inner side in the vehicle width direction by a predetermined distance from the side wall surface of the vehicle in order to secure an installation space for a rear wheel (not shown). The rear part 9a is installed so as to extend substantially linearly to the front side of the vehicle, and the front part is inclined outwardly from the front end part in a side view while the front part is directed outward in the vehicle width direction in a plan view. The front portion 9b is installed at an inclination, and the rear end portions of the floor frame 5 and the side sill 7 are connected to the front end portion of the front portion 9b. Further, a pair of front and rear rear cross members 11 and 12 that connect the left and right rear side frames 9 and 9 are installed so as to extend in the vehicle width direction.

  The floor sub-frame 6 is inclined inwardly in a plan view along the lower surface of the floor panel 3 from an intermediate portion in the front-rear direction of the floor frame 5, and an inclined portion 6 a extending downward from the tunnel portion 4, and this inclination The rear portion 6b extends from the rear end portion of the portion 6a to the rear side of the vehicle body along the tunnel portion 4, and the lower portion of the tunnel portion 4 is reinforced by the rear portion 6b of the floor subframe 6. ing. The floor frame 5 and the inclined portion 6a of the floor subframe 6 form a substantially Y-shaped branch frame in plan view, and the rear portion 6b of the floor subframe 6 and the floor frame 5 are As shown in FIG. 5, they are connected by a strength member 13 disposed below the floor panel 3.

  The strength member 13 includes a connecting pipe 14 that connects the floor frame 5 and the floor subframe 6 below the floor panel 3, nuts 15 that are inserted and fixed at both right and left ends thereof, the floor frame 5 and the floor It has a pair of left and right screw shafts 16 installed through the insertion holes formed in the subframe 6, and three nuts 17 to 19 screwed to the respective screw shafts 16. One end portion of the screw shaft 16 passes through an insertion hole formed in the inner wall portion of the floor frame 5 or the floor subframe 6 and is screwed to the nut 15 of the connection pipe 14. 5 or the inner side wall portion of the floor subframe 6 is clamped from inside and outside via the nuts 15 and 17, whereby one end portion of the screw shaft 16 is fixed to the side end portion of the connecting pipe 14.

  The other end of the screw shaft 16 passes through an insertion hole formed in the outer wall portion of the floor frame 5 or the floor subframe 6, and this outer wall portion is a nut 18 screwed onto the screw shaft 16. The other end portion of the screw shaft 16 is fixed to the outer wall portion of the floor frame 5 or the floor sub-frame 6. In this way, the rear portion 6b of the floor subframe 6 and the floor frame 5 are connected via the strength member 13, so that the installation interval between the floor frame 5 and the floor subframe 6 is expanded and deformed. Is effectively prevented, and the collision energy input to the floor frame 5 is transmitted to the tunnel portion 4 via the strength member 13 and the floor subframe 6 when the vehicle collides. Yes.

  On the floor panel 3, as shown in FIGS. 6 and 7, a front row passenger seat comprising a driver's seat or a passenger seat so as to straddle the installation portion of the floor frame 5 and the installation portion of the floor subframe 6. The passenger seat 20 is slidably supported via a seat slide rail 21. The seat slide rail 21 includes a front bracket 22 installed on the floor panel 3 at the front and rear positions corresponding to the connection portion of the floor subframe 6 to the floor frame 5, the rear portion of the floor frame 5, and the floor subframe 6. A rear bracket 23 installed on the floor panel 3 at a position corresponding to the front end of the rear portion 6b of the rear part, and a pair of left and right lower rails 24 installed on the front brackets 22, 22 and the rear brackets 23, 23, 24 and a pair of front and rear connecting frames 25, 25 for connecting the left and right lower rails 24, 24. An upper rail (not shown) fixed to the bottom of the occupant seat 20 is slidably supported along the lower rails 24 and 24.

  As shown in FIG. 8, the mounting bolts 26 for fixing the rear ends of the lower rails 24, 24 to the floor panel 3 are inserted through the rear bracket 23, the floor panel 3 and the floor frame 5 or the floor subframe 6. And a pair of upper and lower nuts 27, 27 are screwed into the lead-out portion, so that the bottom wall portion of the floor frame 5 or the floor sub-frame 6 is sandwiched, The rear ends of the lower rails 24, 24 are fixed to the installation portion of the floor frame 5 or the floor subframe 6. Similarly, the mounting bolts for fixing the front end portions of the lower rails 24, 24 to the floor panel 3 pass through the insertion holes formed in the front bracket 22, the floor panel 3 and the like below the floor panel 3. The front end portions of the lower rails 24 and 24 are fixed in the vicinity of the installation portions of the floor frame 5 and the floor subframe 6 by screwing nuts into the lead-out portions.

  As shown in FIG. 7, a rear row passenger seat 30 is disposed on the floor panel 3 positioned at the rear portion of the front row passenger seat 20, and as shown in FIG. A footrest portion 31 for an occupant seated on the seat 30 is formed in the rear portion of the floor frame 5 and the installation portion of the floor subframe 6. Specifically, the rear portion of the floor frame 5 is disposed at a position close to the side sill 7, and the rear portion 6 b of the floor subframe 6 is installed along the tunnel portion 4, so that the lower surface portion A predetermined range of the floor panel 3 reinforced by the occupant is used as a footrest portion 31 for an occupant seated on the occupant seat 30.

  As shown in FIGS. 2 to 4, a torque box 32 extending outward in the vehicle width direction of the vehicle body along the lower surface of the dash lower portion 1 b is provided on the outer surface of the rear end portion of the front side frame 2. A front portion of the side sill 7 and a rear end portion of the front side frame 2 are connected via the torque box 32. The torque box 32 extends to the rear side of the vehicle with a predetermined distance between a front wall 33 extending downward along the dash lower portion 1b and a lower surface thereof from a lower surface of the dash lower portion 1b. It consists of a box-shaped member having a bottom wall 34 and a rear wall 35 installed so as to extend upward from the rear end portion and connected to the dash lower portion 1b or the lower surface of the floor panel 3. And the rear side part which consists of the rear wall 35 of the said torque box 32 is inclined and installed so that it may be located in the back side of a vehicle body as it approaches the said side sill 7, ie, the vehicle width direction outer side, and The outer end portion 35a of the rear wall 35 extends to a position beyond the rear end of the dash lower portion 1b.

  In the above configuration, when a frontal collision occurs in the vehicle and impact energy is input to the front side frame 2, the collision energy is applied to the inclined portion 2a of the front side frame 2 as shown by an arrow P1 in FIG. 2 is transmitted to the dash panel 1 and a part thereof is transmitted to the side sill 7 via the torque box 32 as shown by an arrow P2 in FIG. The remaining collision energy is transmitted from the rear end portion of the front side frame 2 to the floor frame 5 as shown by an arrow P3 in FIG.

  A rear side portion formed by the rear wall 35 of the torque box 32 is installed to be inclined so as to be positioned on the rear side of the vehicle body as it approaches the side sill 7. For this reason, the transmission direction P2 of the collision energy input from the front side frame 2 to the torque box 32 is converted to the rear outer side through the torque box 32, whereby the collision energy is transmitted to the side sill 7. Is transmitted smoothly. Then, the collision energy is transmitted from the side sill 7 to the rear side frame 9 so as to be stably supported.

  In addition, as shown by an arrow P3 in FIG. 2, the collision energy input from the front side frame 2 to the floor frame 5 during the frontal collision of the vehicle is a part of the floor subframe as shown by an arrow P4. 6 is transmitted to and supported by the lower side of the tunnel portion 4, and the remaining collision energy is passed through the floor frame 5 installed along the lower surface of the floor panel 3 and the rear end side of the side sill 7 and By being transmitted to the front end portion of the rear side frame 9, it is supported stably.

  Further, in the case of a side collision in which another vehicle collides with the side surface of the vehicle, collision energy acts to push the intermediate portion in the front-rear direction of the floor frame 5 in the vehicle width direction via the side sill 7 and the floor panel 3 (see FIG. 2), the collision energy is transmitted to the floor subframe 6 and the tunnel portion 4 while being supported by the strength member 13 disposed on the lower side of the floor panel 3. Therefore, by providing the strength member 13 that connects the floor sub-frame 6 and the floor frame 5, it is effective to deform the bottom surface portion of the passenger compartment and the like in accordance with the impact energy input at the time of a side collision of the vehicle. Can be effectively prevented, and the rigidity of the vehicle body against a side impact load can be effectively improved.

  As described above, the dash panel 1 installed so as to partition the vehicle compartment front and the engine room, the pair of left and right front side frames 2, 2 extending from the installation portion of the dash panel 1 to the front side of the vehicle, A floor panel 3 that forms a bottom surface portion of the vehicle compartment continuously from the lower end of the dash panel 1 and a vehicle width direction center portion of the floor panel 3 bulges toward the vehicle interior side so as to extend in the longitudinal direction of the vehicle body. In the lower vehicle body structure of the vehicle provided with the tunnel portion 4 installed in the vehicle, a side sill 7 having a closed cross section extending in the front-rear direction of the vehicle is provided on both sides of the floor panel 3 in the vehicle width direction. A torque box 32 having a closed cross-sectional shape extending along the dash panel 1 so as to connect the front part of the front side frame 2 and the rear end part of the front side frame 2 Since the rear side portion of the lux box 32 is inclined so as to be positioned on the rear side of the vehicle body as it approaches the side sill 7, the rigidity of the vehicle body can be effectively improved with a simple configuration. There is an advantage that the collision energy acting at the time of collision can be effectively absorbed.

  That is, the torque box 32 having a closed cross section provided so as to extend along the dash panel 1 connects the front portion of the side sill 7 and the rear end portion of the front side frame 2, and Since the rear side portion of the rear wall 35 is inclined so as to be positioned on the rear side of the vehicle body as it approaches the side sill 7, the collision input from the front side frame 2 to the torque box 32 at the time of frontal collision of the vehicle By converting the energy transmission direction to the rear outer side via the torque box 32, the collision energy can be smoothly transmitted to the side sill 7. Therefore, there is an advantage in that the collision energy input from the front side frame 2 to the lower part of the vehicle body can be dispersed throughout the vehicle body and effectively supported at the time of a vehicle front collision.

  Further, in the above-described embodiment, the torque box 32 that is inclined so that the rear side portion is positioned on the rear side of the vehicle body as the side sill 7 is approached, the lower surface of the dash panel 1, specifically, the dash lower portion. Since it is configured by a box-shaped member installed along the lower surface of 1b, the torque box 32 is installed in a state of projecting into the vehicle interior without causing adverse effects such as narrowing the vehicle interior space. The rigidity of the vehicle body with respect to the frontal impact load of the vehicle can be effectively improved by arranging the torque box 32 having the above shape.

  Moreover, in the above-described embodiment, the lower portion of the dash panel 1 is provided with a dash lower portion 1b that extends in the front-rear direction of the vehicle in a front-upward inclined state, and the front end portion of the floor panel 3 is connected to the rear end portion thereof. In the vehicle body structure, since the rear wall outer end portion 35a of the torque box 32 extends to a position beyond the rear end of the dash lower portion 1b, the vicinity of the dash lower portion 1b according to the collision energy input at the time of front collision of the vehicle. The torque box 32 can effectively prevent the deformation of the portion and the like, and the collision energy can be efficiently transmitted to the side sill 7 through the torque box 32.

  Further, as shown in the above embodiment, the rear end portion of the floor frame 5 is connected to the vicinity of the rear end portion of the side sill 7 having a closed cross-sectional shape disposed on both sides of the floor panel 3 in the vehicle width direction. In this case, since the side sill 7 can be used as a support member for supporting the collision energy input from the front side frame 2 to the floor frame 5, the rigidity of the vehicle body against the frontal impact load of the vehicle can be simplified. There is an advantage that it can be improved more effectively.

  As shown in the embodiment, the torque box 32 is connected to the front portion of the floor frame 5 installed so as to extend from the rear end portion of the front side frame 2 along the floor panel 3 to the rear side of the vehicle; In this case, the collision energy input to the front side frame 2 can be efficiently distributed and transmitted from the torque box 32 to the side sill 7 and the floor frame 5 at the time of a frontal collision of the vehicle. There is an advantage that it can be supported more effectively.

  Further, in the above embodiment, the floor frame 5 is installed so as to extend from the rear end portion of the front side frame 2 to the rear side of the vehicle body, and the rear portion of the floor frame 5 is inclined toward the outer side in the vehicle width direction. Since the rear end of the floor frame 5 is connected to the front end of the rear side frame 9 disposed on the left and right of the rear part of the vehicle, the collision energy input from the front side frame 2 to the floor frame 5 at the time of the front collision of the vehicle Can be stably supported by transmitting to the rear side frame 9, and the rigidity of the vehicle body against the front impact load of the vehicle can be effectively improved with a simple configuration.

  In the above-described embodiment, the floor subframe 6 that extends from the intermediate portion in the front-rear direction of the floor frame 5 toward the tunnel portion 4 inward in the vehicle width direction and extends toward the rear side of the vehicle is disposed. By transmitting the collision energy input to the floor frame 5 at the time of a collision to the tunnel portion 4 side through the floor subframe 6, this can be stably supported. Therefore, even in an open car or the like without a roof, there is an advantage that the rigidity of the vehicle body can be sufficiently secured with a simple configuration and the deformation of the vehicle body at the time of a vehicle collision can be effectively prevented.

  In particular, as shown in the above embodiment, when the floor subframe 6 and the floor frame 5 are connected by the strength member 13 disposed on the lower side of the floor panel 3, the side collision of the vehicle occurs. Sometimes, the collision energy input from the vehicle body side portion can be efficiently transmitted to the floor subframe 6 and the tunnel portion 4 by the strength member 13, and can be stably supported. In addition, the collision energy input from the front part of the vehicle body at the time of the frontal collision of the vehicle is transmitted to the rear side of the vehicle by the floor frame 5 installed along the lower surface of the floor panel 3, and via the floor subframe 6. When transmitting a part of the collision energy to the tunnel portion 4 side, the collision energy is stabilized in a state in which the installation interval of the floor frame 5 and the floor subframe 6 is effectively prevented from expanding and deforming. There is an advantage that can be supported.

  Further, in the above-described embodiment, the rear portion 6b of the floor subframe 6 is installed so as to extend in the front-rear direction of the vehicle body along the tunnel portion 4, so that the tunnel portion 4 is interposed via the rear portion 6b of the floor subframe 6. Therefore, the rigidity of the vehicle body in the vicinity of the center portion in the vehicle width direction of the floor panel 3 can be effectively improved. Therefore, there is an advantage that the vehicle body deformation can be reliably suppressed by effectively supporting the collision energy transmitted to the installation portion of the tunnel portion 4 at the time of frontal collision or side collision of the vehicle.

  Further, as shown in FIG. 9, an occupant footrest portion 31 seated on a rear row of occupant seats 30 disposed in the rear portion of the passenger compartment is provided on the floor frame 5 disposed below the floor panel 3. In the case where the structure is provided between the rear portion and the floor subframe 6, the footrest space is prevented from being narrowed due to the reinforcing member protruding from the upper surface of the floor panel 3. There is an advantage that the feet of the occupant seated on the occupant seat 30 can be stably placed on the upper surface of the floor panel 3 reinforced by the floor frame 5 and the floor subframe 6.

DESCRIPTION OF SYMBOLS 1 Dash panel 1b Dash lower part 2 Front side frame 3 Floor panel 4 Tunnel part 5 Floor frame 6 Floor sub frame 7 Side sill 9 Rear side frame 30 Crew seat 32 Torque box 35 Rear wall (rear part)

Claims (6)

  A dash panel installed so as to partition the front part of the passenger compartment and the engine room, a pair of left and right front side frames extending from the installation part of the dash panel to the front side of the vehicle, and a lower end of the dash panel A vehicle equipped with a floor panel that forms a bottom part of a passenger compartment and a tunnel part that extends in the front-rear direction of the vehicle body by bulging the center part in the vehicle width direction of the floor panel toward the passenger compartment. It is a lower body structure, and a side sill having a closed cross section extending in the vehicle front-rear direction is provided on both sides of the floor panel in the vehicle width direction, and the front part of the side sill and the rear end part of the front side frame And a torque box having a closed cross-sectional shape extending along the dash panel so as to connect the torque box. Lower vehicle body structure of a vehicle, characterized in that disposed inclined so as to be located on the vehicle body of the rear side toward the idosyl.   2. The lower body structure of a vehicle according to claim 1, wherein the torque box is configured by a box-like member installed along the lower surface of the dash panel.   The lower end portion of the dash panel is provided with a dash lower portion that extends in the front-rear direction of the vehicle in an upwardly inclined state, the front end portion of the floor panel is connected to the rear end portion, and the rear wall of the torque box The lower body structure of a vehicle according to claim 1 or 2, wherein the outer end portion extends to a position beyond the rear end of the dash lower portion.   The lower body structure of a vehicle according to any one of claims 1 to 3, wherein a rear end portion of the side sill is connected to a front end portion of a rear side frame disposed on the left and right of the rear portion of the vehicle.   5. A floor frame extending from a rear end portion of the front side frame along a floor panel to a rear side of the vehicle, and the torque box being connected to a front portion of the floor frame. The lower body structure of a vehicle according to any one of the above.   The floor frame is installed with an inclination so that a rear portion thereof is directed outward in the vehicle width direction, and a rear side portion of the floor frame is connected to a front end portion of a rear side frame. The lower body structure of the vehicle according to claim 5.

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