JP2010167820A - Lower vehicle body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and effectively improve rigidity in a vehicle body without causing a problem such as the narrowing of a space in a cabin. <P>SOLUTION: This lower vehicle body structure of a vehicle has a pair of right and 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 forming a bottom surface of the cabin, and a tunnel 4 arranged so as to extend in the longitudinal direction of the vehicle body by swelling a central part in the vehicle width direction of the floor panel 3 to the inside of the cabin. A pair of right and left floor frames 5 and 5 are arranged extending in the longitudinal direction of the vehicle body along an under surface of the floor panel 3. A floor sub-frame 6 extending to the rear side of the vehicle while being inclined to the inner side in the vehicle width direction toward the tunnel 4 is arranged from an intermediate part in the longitudinal direction of the floor frame 5. The floor sub-frame 6 and the floor frame 5 are connected by a strength member 13 arranged under the floor panel 3. <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 with a lower open U-shaped cross-section structure that projects above the floor frame or side sill along the center line in the vehicle width direction between the front side frame and the rear side frame. In the provided vehicle body structure, an auxiliary frame having a closed cross-sectional structure is provided on the upper part of the floor tunnel, It has been performed to bond the extension of the closed cross Ron preparative side frames and the 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 the frontal collision of the vehicle from the auxiliary frame, which is substantially at the same height as the front side frame, to the rear side frame, so that the entire collision energy of the respective members can be reduced. Can be absorbed efficiently.

  In Patent Document 1, the left and right center cross members (floor cross frames) are extended and joined to the left and right side sills through the left and right floor frames, and the floor panels are reinforced by these center cross members. Thus, a configuration has been disclosed in which the vehicle body rigidity can be improved during a side collision of the vehicle. However, when the center cross member is disposed on the left and right floor frames as described above, the center cross member protrudes into the vehicle interior to narrow the vehicle interior space and is seated on the passenger seat. There are problems such as narrowing the foot space of the occupants.

  Also, in Patent Document 2, a configuration in which the left and right side sills, side frames, and tunnel top reinforcement are connected via a center cross member installed on a floor pal is disclosed. However, there is a problem that the center cross member protrudes into the vehicle interior and the vehicle interior space is reduced, and the foot space of the passenger seated on the passenger seat is reduced.

  The present invention has been made in view of the above-described problems, and it is intended to make it possible to easily and effectively improve the rigidity of a vehicle body without causing problems such as narrowing of a vehicle interior space. It is aimed.

  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 lower body structure of a vehicle including a tunnel portion, and provided with a pair of left and right floor frames extending in the front-rear direction of the vehicle body along the lower surface of the floor panel, and from the middle portion in the front-rear direction of the floor frame, A floor subframe extending toward the rear side of the vehicle while being inclined inward in the vehicle width direction toward the tunnel portion is disposed. And a lower frame in which are connected by a reinforcement member disposed below the floor panel.

  According to a second aspect of the present invention, in the lower body structure of the vehicle according to the first aspect, an occupant seat is installed so as to straddle the installation portion of the floor frame and the installation portion of the floor subframe. .

  According to a third aspect of the present invention, in the lower body structure of the vehicle according to the first or second aspect, the floor frame is installed with an inclination so that a rear portion thereof is directed outward in a vehicle width direction. In addition, 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 of the rear portion of the vehicle.

  According to a fourth aspect of the present invention, in the vehicle lower body structure according to any one of the first to third aspects, 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. A side sill having a shape is provided, and the rear end of the floor frame is connected to the vicinity of the rear end of the side sill.

  According to a fifth aspect of the present invention, in the lower body structure of the vehicle according to the fourth aspect, a torque box having a closed cross-sectional shape for connecting the front portion of the side sill and the rear end portion of the front side frame is provided. It is.

  In the invention according to claim 1, the collision energy input from the front part of the vehicle body at the time of the frontal collision of the vehicle is transmitted and supported to the rear side of the vehicle by the floor frame installed along the lower surface of the floor panel. In addition, a part of the collision energy can be transmitted to the tunnel portion side by the floor sub-frame and efficiently supported, and the collision energy input from the vehicle body side portion at the time of a side collision of the vehicle can be transmitted to the floor by the strength member. It can be efficiently supported by being transmitted to the subframe and the tunnel portion. Therefore, deformation of the vehicle body at the time of vehicle collision can be achieved without taking measures such as disposing a center cross member on the floor panel to prevent the vehicle body from being deformed according to the impact energy at the time of the side collision. This can be effectively prevented, and there is an advantage that the rigidity of the vehicle body can be sufficiently secured with a simple configuration even in an open car without a roof.

  In the invention according to claim 2, since the front-row passenger seat composed of the driver's seat or the passenger's seat is installed so as to straddle the installation portion of the floor frame and the installation portion of the floor subframe, the floor frame In addition, the installation portion of the occupant seat can be effectively reinforced through the floor subframe and the strength member, and the installation state of the occupant seat is stably maintained, so that the riding comfort is effectively improved. There is an advantage that can be improved. Moreover, since the collision energy input to the floor frame and the floor sub-frame at the time of a side collision of the vehicle can be transmitted to and supported by the occupant seat and the seat slide rail that supports the occupant seat, the side collision load of the vehicle It is possible to effectively improve the support rigidity.

  In the invention according to claim 3, the rear portion of the floor frame is inclined toward the outer side in the vehicle width direction, and the rear end portion of the floor frame is arranged at the front end portion of the rear side frame disposed on the left and right of the rear portion of the vehicle. Because it is connected to the vehicle, it can be supported stably by transmitting the collision energy input from the front side frame to the floor frame to the rear side frame at the time of frontal collision of the vehicle, and the structure of the vehicle body against the frontal collision load of the vehicle is simple. Can effectively improve.

  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 provided on both sides of the floor panel in the vehicle width direction, The side sill can be used as a support member for supporting the collision energy input to the floor frame, and there is an advantage that the rigidity of the vehicle body against the front collision load of the vehicle can be more effectively improved with a simple configuration.

  In the invention according to claim 5, since the torque box having a closed cross-sectional shape that connects the front portion of the side sill and the rear end portion of the front side frame is provided, the impact energy input to the front side frame at the time of a front collision in the vehicle. Can be supported by transmitting from the torque box to the front part of the side sill, and the rigidity of the vehicle body against the frontal impact load of the vehicle can be further 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. The tunnel portion 4 is installed to extend in the front-rear direction, and tunnel upper reinforcements 4a, 4a having a closed cross-sectional shape are installed on the 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 sub-frame 6 extending from the middle portion in the direction toward 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 subframe 6 includes an inclined portion 6a extending 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 extending toward the tunnel portion 4, and the inclined portion 6a. The rear portion 6b extends from the rear end portion 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. . 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 portions of the floor frame 5 and 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 FIG. 3, a torque box 32 extending outward in the vehicle width direction of the vehicle body is provided on the outer surface of the rear end portion of the front side frame 2 along the lower surface of the dash lower portion 1b. A front portion of the side sill 7 and a rear end portion of the front side frame 2 are connected via 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. As shown in FIGS. 2 and 3, the rear side portion of the rear wall 35 of the torque box 32 is positioned on the rear side of the vehicle body as it approaches the side sill 7, that is, toward the outer side in the vehicle width direction. And the outer end 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 tunnel portion 4 side, and the remaining collision energy is transmitted to the rear end side of the side sill 7 and the front end portion of the rear side frame 9 through the floor frame 5, thereby stabilizing To be supported.

  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 of the vehicle compartment according to the impact energy input at the time of a side collision of the vehicle. 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 floor frame 5 extending in the front-rear direction of the vehicle body along the lower surface of the floor panel 3 is provided, and from the middle portion in the front-rear direction of the floor frame 5 A floor subframe 6 extending toward the rear side of the vehicle while being inclined inward in the vehicle width direction toward the tunnel portion 4 is disposed. Since the floor frame 5 is connected by the strength member 13 disposed on the lower side of the floor panel 3, the rigidity of the vehicle body can be easily and effectively improved without causing a problem such as narrowing of the vehicle interior space. Can do.

  That is, the collision energy input from the front part of the vehicle body at the time of the frontal collision of the vehicle can be transmitted and supported to the rear side of the vehicle by the floor frame 5 installed along the lower surface of the floor panel 3, and the floor By transmitting a part of the collision energy to the tunnel portion 4 side via the subframe 6, this can be stably supported. Moreover, at the time of a side collision of the vehicle, the collision energy input from the side part of the vehicle body can be efficiently transmitted to the floor subframe 6 and the tunnel part 4 by the strength member 13 to support the collision energy. Therefore, as in the conventional example in which the center cross member for preventing the vehicle body from being deformed according to the impact energy at the time of the side collision is provided on the floor panel 3, the space in the vehicle interior is reduced. It is possible to effectively prevent deformation of the vehicle body at the time of a vehicle collision without causing a problem, and there is an advantage that the rigidity of the vehicle body can be sufficiently secured with a simple configuration even in an open car without a roof. is there.

  In particular, as shown in FIG. 6, a front row passenger seat 20 including a driver's seat or a passenger seat is installed so as to straddle the installation portion of the floor frame 5 and the installation portion of the floor subframe 6. In this case, since the installation portion of the passenger seat 20 can be effectively reinforced through the floor frame 5 and the floor subframe 6 and the strength member 13, the installation state of the passenger seat 20 can be stabilized. And maintaining it is advantageous in that the ride comfort can be effectively improved. Moreover, since the collision energy input to the floor frame 5 and the floor subframe 6 at the time of a side collision of the vehicle can be transmitted to and supported by the occupant seat 20 and the seat slide rail 21 that supports the passenger seat, the vehicle It is possible to effectively improve the support rigidity against the side impact load.

  Further, in the above-described embodiment, the floor frame 5 is installed so as to be inclined so that the rear portion thereof is directed outward in the vehicle width direction, and the rear end portion of the floor frame 5 is disposed on the left and right sides of the rear portion of the vehicle. Since it is configured to be connected to the front end portion of the rear side frame 9 provided, the collision energy input from the front side frame 2 to the floor frame 5 is transmitted to the rear side frame 9 at the time of a frontal collision of the vehicle. The rigidity of the vehicle body against the front impact load of the vehicle can be effectively improved with a simple configuration.

  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.

  In particular, in the above embodiment, the rear end portion of the side sill 7 is configured to be connected to the front end portions of the rear side frame 9 disposed on the left and right of the rear portion of the vehicle, so that the front sill 7 is transmitted to the side sill 7. The collision energy can be transmitted from the side sill 7 to the rear side frame 9. Therefore, there is an advantage that the collision energy input to the front side frame 2 can be dispersed throughout the vehicle body and effectively supported during a frontal 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. When the structure is provided between the rear portion and the floor sub-frame 6, the space for footrest is prevented from being narrowed due to the reinforcing member protruding from the upper surface of the floor panel 3. However, there is an advantage that the feet of the passenger seated on the passenger seat 30 can be stably placed on the upper surface portion of the floor panel 3 reinforced by the floor frame 5 and the floor subframe 6.

  In the above embodiment, since the torque box 32 having a closed cross-sectional shape for connecting the front portion of the side sill 7 and the rear end portion of the front side frame 2 is provided, the front side frame 2 is attached to the front side frame 2 at the time of a front collision in the vehicle. A part of the input impact energy can be supported by transmitting it from the torque box 32 to the front part of the side sill 7 (see arrow P2 in FIG. 2). Therefore, the rigidity of the vehicle body against the front impact load of the vehicle can be further effectively improved with a simple configuration.

  In particular, as shown in the above-described embodiment, when the rear side portion formed by the rear wall 35 of the torque 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 front side By converting the transmission direction of the collision energy input from the frame 2 to the torque box 32 to the rear outer side via the torque box 32, the collision energy can be smoothly transmitted to the side sill 7. The side sill 7 has an advantage that the collision energy can be stably supported.

  Moreover, in the said embodiment, since the torque box 32 was comprised by the box-shaped member installed along the lower surface of the dash panel 1, specifically, the lower surface of the said dash lower part 1b, the said torque box 32 is in a vehicle interior. It is possible to effectively improve the rigidity of the vehicle body against the front impact load of the vehicle without causing adverse effects such as narrowing of the vehicle interior space due to the installation in the protruding state.

  Furthermore, in the said embodiment, the lower part of the vehicle which provided the dash lower part 1b extended in the front-back direction of a vehicle in the front-up inclination state in the lower end part of the dash panel 1, and connected the front-end part of the said floor panel 3 to the rear end part. 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 impact energy input at the time of the 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.

  In particular, as shown in the above 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 the case of the structure, the collision energy input to the front side frame 2 can be efficiently distributed by being distributed 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 the collision energy can be supported more effectively.

DESCRIPTION OF SYMBOLS 1 Dash panel 2 Front side frame 3 Floor panel 4 Tunnel part 5 Floor frame 6 Floor sub frame 7 Side sill 9 Rear side frame 13 Strength member 20 Front passenger seat 30 Rear passenger seat 32 Torque box

Claims (5)

  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. A lower body structure is provided with a pair of left and right floor frames extending in the front-rear direction of the vehicle body along the lower surface of the floor panel, and the vehicle width direction from the front-rear middle part of the floor frame toward the tunnel part A floor subframe that is inclined inwardly and extends toward the rear side of the vehicle is disposed, and the floor subframe and the floor frame are connected to each other. Lower vehicle body structure of a vehicle, characterized in that the disposed a strength member below the panel being connected.   The vehicle lower body structure according to claim 1, wherein an occupant seat is installed so as to straddle the installation section of the floor frame and the installation section of the floor subframe.   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 end portion of the rear side frame disposed on the left and right sides of the rear portion of the vehicle. The lower body structure of a vehicle according to claim 1, wherein the lower body structure is connected to a portion.   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 rear end of the floor frame is connected in the vicinity of the rear end of the side sill. The vehicle lower body structure according to any one of claims 1 to 3.   5. The lower body structure of a vehicle according to claim 4, further comprising a torque box having a closed cross-sectional shape that connects a front portion of the side sill and a rear end portion of the front side frame.

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