JP2016068582A - Vehicle lower part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lower part structure which has preferable front collision performance and in which a seating point of a seat can be lowered.SOLUTION: A vehicle lower part structure comprises a floor panel 8, a floor tunnel, a side sill, a floor cross member 14, and a front floor frame 13. The front floor frame 13 comprises an upper member 13U and a lower member 13D. A closed cross section is formed by jointing the upper member 13U and the lower member 13D via the floor panel 8. A jointing line 44 between the upper member 13U and the lower member 13D is downward inclined as going toward a rear side of a vehicle. The floor panel 8 is also downward inclined according to the inclination of the jointing line. A rear end part 13Z of the upper member 13U is connected over vertical width of the floor cross member 14.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle lower structure.

  As a vehicle lower structure, for example, one having a front side member, a cross member, a side member reinforcing member, and a floor upper member is known. (For example, refer to Patent Document 1).

  In the vehicle lower structure described in Patent Document 1, the front side member, the cross member, and the reinforcing member are formed in a cross-sectional hat shape. The front side member is joined to the lower surface of the vehicle body floor and extends along the vehicle front-rear direction. The cross member is joined to the upper surface of the vehicle body floor, and extends along the vehicle width direction so as to intersect the front side member in plan view. The reinforcing member is joined to a position overlapping the front side member in plan view on the upper surface of the vehicle body floor, and extends in the vehicle front-rear direction. The reinforcing member is disposed in the cross section of the front side member and extends along the vehicle front-rear direction. The reinforcing member is terminated at the front position of the cross member. Further, the rear end portion of the reinforcing member is extended to the rear side of the vehicle up to a position where it overlaps with the cross member in plan view.

JP 2007-131148 A

  In the conventional vehicle lower structure, the front side member has a monaca structure, the reinforcing member is terminated at the front position of the cross member, and the reinforcing member is connected to the cross member. Sudden performance is maintained. However, since the reinforcing member is not in contact with the cross member, there is a problem that the load transmitted from the front to the front side member is not sufficiently transmitted to the cross member. In addition, there is an increasing demand for further reducing the height of the vehicle and lowering the seating point of the seat.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a vehicle lower structure that is capable of transmitting a front collision load and that can lower the seating point of a seat.

The vehicle lower structure according to the present invention employs the following configuration in order to solve the above problems.
The invention according to claim 1 is a floor of a passenger compartment (for example, the passenger compartment 2 of the embodiment) provided with a seat (for example, the seat S of the embodiment) on which a passenger of the vehicle (for example, the vehicle 1 of the embodiment) gets. A floor panel (for example, the floor panel 8 of the embodiment) provided in the vehicle, a floor tunnel (for example, the floor tunnel 20 of the embodiment) disposed in the center in the vehicle width direction and extending in the vehicle longitudinal direction, A side sill (for example, the side sill 7 of the embodiment) disposed at both ends in the width direction and extending in the vehicle front-rear direction, and joined to the floor panel and between the floor tunnel and the side sill. A floor cross member extending in the width direction (for example, the floor cross member 14 of the embodiment), and extending from the front of the floor panel to the floor cross member in the vehicle front-rear direction. A first floor frame (for example, the front floor frame 13 of the embodiment), and the first floor frame includes an upper member (for example, the upper member 13U of the embodiment) and a lower member (for example, the embodiment). A lower member 13D), and the first floor frame forms a closed cross-section by joining the upper member and the lower member via the floor panel, and the upper member A seam (for example, seam 44 in the embodiment) with the lower member is inclined downward as it advances rearward of the floor panel, and the floor panel is also inclined downward according to this inclination. The end portion (for example, the rear end portion 13Z of the embodiment) is connected over the vertical width of the floor cross member.
With the above configuration, for example, when a large impact load is input from the front side of the vehicle at the time of a front collision, the impact load is input to the first floor frame and transmitted in the longitudinal direction of the first floor frame. It is continuously transmitted from the rear end of the frame to the floor cross member. The impact load transmitted to the floor cross member is efficiently distributed to floor tunnels and side sills arranged on both sides. For this reason, the front collision performance of the vehicle is improved.
Further, for example, since the floor panel is inclined downward in front of the floor cross member, the seat installation position is further lowered, so that the seating point of the seat can be lowered.

According to a second aspect of the present invention, in the vehicle lower structure according to the first aspect, the first ridge line (for example, implementation) extending in the vehicle front-rear direction at the upper end portion (for example, the upper end portion 13T of the embodiment) of the upper member. A ridge line 31 of the embodiment is provided, and a second ridge line (for example, the ridge line 32 of the embodiment) extending in the vehicle width direction is provided at the upper end portion (for example, the upper end portion 14T of the embodiment) of the floor cross member. The rear end portion of the first ridge line (for example, the rear end portion 31Z of the embodiment) is connected to the vicinity of the second ridge line.
With the above configuration, for example, the impact load transmitted to the first floor frame is continuously transmitted along the first ridge line and the second ridge line having high strength at the time of the front collision, so that the floor cross member, the floor tunnel, and the Dispersed efficiently by the side sill.

According to a third aspect of the present invention, in the vehicle lower structure according to the second aspect, the floor cross member is disposed in front of the floor panel from the second ridgeline and is inclined downward as it proceeds forward (for example, It is provided with the inclined surface 34) of embodiment, and the rear-end part of the said upper member is connected to the said inclined surface at least.
With the above configuration, for example, the rear end of the first floor frame is covered with the inclined surface even when the floor cross member requires an inclined surface to fix components such as a sheet to the floor panel. Since the first ridge line and the second ridge line are connected in a connected state, the impact load input to the first floor frame at the time of the front collision is transmitted to the floor cross member along the first ridge line, and the floor cross It is efficiently distributed by floor tunnels and side sills connected to both ends of the member.

According to a fourth aspect of the present invention, in the lower vehicle structure according to the second aspect, the upper end portion of the upper member is an upper surface (for example, the upper surface 36 of the embodiment) and a pair of the first ridge lines formed at both ends thereof. (For example, the ridge lines 31A and 31B of the embodiment), and the rear end portion of the upper member (for example, the rear end portion 13Z of the embodiment) has the upper surface and the pair of first ridge lines as the floor. It is characterized by being joined to a cross member.
With the above configuration, for example, since the pair of first ridge lines are respectively connected to the floor cross member, the impact load input to the first floor frame at the time of the front collision travels along the first ridge line, the floor cross member, the floor tunnel, and the Dispersed efficiently by the side sill.

According to a fifth aspect of the present invention, in the vehicle lower part structure according to any one of the first to fourth aspects, front side frames (for example, the front side frame 10 of the embodiment) are provided on the left and right sides of the front portion of the vehicle body of the vehicle. The rear end of the front side frame (for example, the rear end 10Z of the embodiment) is connected to the front end of the first floor frame (for example, the front end 13F of the embodiment). It is.
With the above configuration, for example, most of the impact load at the time of the front collision is transmitted to the rear side after being input to the front side frame, so this large impact load is continuously transmitted from the front side frame to the first floor frame. Furthermore, it is efficiently distributed by the floor cross member, the floor tunnel and the side sill.

According to a sixth aspect of the present invention, in the vehicle lower part structure according to any one of the first to fifth aspects, the vertical width of the first floor frame is substantially constant over the vehicle front-rear direction. To do.
With the above configuration, the transmission efficiency of the impact load input to the first floor frame at the time of the front collision is improved, and an increase in the vertical width of the first floor frame is suppressed.

The invention according to claim 7 is the vehicle lower structure according to any one of claims 1 to 6, wherein the second floor is joined to the floor panel and extends from the floor cross member toward the rear of the vehicle. A frame (for example, the rear floor frame 40 of the embodiment) is provided, and the second floor frame is arranged at a position overlapping the first floor frame in the vehicle width direction.
With the above configuration, the impact load input to the first floor frame at the time of the front collision is efficiently transmitted continuously and linearly to the second floor frame via the floor cross member. In addition, since the rear portion of the floor panel is reinforced by the second floor frame, distortion, twisting, and vibration of the rear portion of the floor panel are suppressed.

According to an eighth aspect of the present invention, in the vehicle lower structure according to the seventh aspect, a closed cross-section portion (for example, a rear end portion (for example, the rear end portion 8Z of the embodiment) of the floor panel that extends in the vehicle width direction is provided. The closed cross-section portion 58 of the embodiment is formed, and the rear end portion of the second floor frame (for example, the rear end portion 40Z of the embodiment) is joined in the vicinity of the closed cross-section portion. It is.
With the above configuration, the impact load transmitted to the second flare frame is continuously transmitted to the closed cross section, so that the impact load is efficiently distributed in the vehicle width direction. In addition, since the second floor frame is connected to the floor cross member and the high-strength closed cross-section portion, distortion, twisting, and vibration of the rear portion of the floor panel are further suppressed.

  According to the present invention, the impact load input to the first floor frame is continuously transmitted to the floor cross member and the floor tunnels and side sills arranged on both sides of the floor cross member, and is efficiently dispersed. Can be increased. Moreover, since the floor panel is inclined downward in front of the floor cross member, the seating point of the seat can be lowered.

1 is a schematic longitudinal sectional view of a vehicle according to an embodiment of the present invention cut along a vehicle front-rear direction. It is a top view of the vehicle lower part structure from the front part of the vehicle of one Embodiment of this invention to the rear part. It is the perspective view which looked at the structure of the connection part vicinity of the front side frame and front floor frame of one Embodiment of this invention from the upper side of the passenger compartment. It is another perspective view which looked at the structure of the connection part vicinity of the front side frame and front floor frame of one Embodiment of this invention from the upper side of the passenger compartment. It is an enlarged top view of the structure of the front floor frame of one Embodiment of this invention, and its vicinity. It is the perspective view which looked at the front floor frame of one Embodiment of this invention and the structure of the vicinity from the diagonally upper side of the passenger compartment. It is the perspective view which looked at the structure near the connection part of the front side frame and front floor frame of one Embodiment of this invention from the downward side of the vehicle body. It is the longitudinal cross-sectional view which looked at the front floor frame of one Embodiment of this invention and the structure of the vicinity from the side of the passenger compartment. It is the perspective view which looked at the rear floor frame of one Embodiment of this invention, and the structure of the vicinity from the diagonally upper side of the passenger compartment. It is the longitudinal cross-sectional view which looked at the rear floor frame of one Embodiment of this invention and the structure of the vicinity from the side of the passenger compartment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the arrow FR indicates the front of the vehicle, and the arrow LH indicates the left side of the vehicle.

FIG. 1 is a view of a vehicle 1 according to the present embodiment, cut along the vehicle front-rear direction at a substantially center in the width direction of a front floor frame 13 described later and viewed from the left side. FIG. 2 is a view of the structure of the left half of the vehicle 1 as viewed from the upper surface side. In the right half of the vehicle 1, a structure corresponding to a state in which the structure shown in FIG.
As shown in FIG. 1, an engine (not shown) is mounted at the rear of the vehicle body of the vehicle 1 of the present embodiment. The vehicle 1 is a rear wheel drive vehicle that drives rear wheels by the engine. A seat S for a passenger to sit in is installed in the passenger compartment 2 in which the passenger of the vehicle 1 rides. In front of the passenger compartment 2, a vehicle front compartment 3 in which a front suspension device and the like are accommodated is disposed. On the rear side of the passenger compartment 2, an engine room 4 that is a vehicle rear compartment is disposed. The passenger compartment 2 and the vehicle front compartment 3 are partitioned by a front partition 5. The passenger compartment 2 and the engine room 4 are partitioned by a rear partition wall 6.

A floor panel 8 is laid on the floor of the passenger compartment 2 (that is, the lower portion of the vehicle 1). A floor tunnel 20 extending in the vehicle front-rear direction below the passenger compartment 2 is disposed at the center in the vehicle width direction.
As shown in FIGS. 1 and 2, the floor tunnel 20 includes a lower tunnel member 20L and an upper tunnel member 20U. The lower tunnel member 20L has a hat-shaped cross-sectional shape that opens upward, and extends along the vehicle longitudinal direction. The left and right opening edge portions of the lower tunnel member 20L are joined to a substantially central portion in the vehicle width direction. The upper tunnel member 20U has a substantially U-shaped cross-sectional shape that opens downward, and extends along the vehicle front-rear direction. The left and right opening edge portions of the upper tunnel member 20U are joined along the side edge portion on the upper end side of the lower tunnel member 20L. By joining the upper tunnel member 20U and the lower tunnel member 20L to each other, a substantially rectangular closed cross-sectional portion (not shown) is formed between the two along the vehicle longitudinal direction.

Side sills 7 which are skeleton members extending in the vehicle front-rear direction below the passenger compartment 2 are disposed at both ends in the vehicle width direction. The left and right side sills 7, 7 (the right side sills 7 are not shown) are connected to each other by a plurality of cross members. Among these cross members, the floor cross member 14 is joined on the floor panel 8 and is disposed between the floor tunnel 20 and each of the left and right side sills 7 in the vehicle width direction. Further, a front floor frame 13 (a first floor frame) extending in the vehicle front-rear direction from the front of the floor panel 8 to the floor cross member 14 between the floor tunnel 20 and each of the left and right side sills 7, 7 in the vehicle width direction. One floor frame) is arranged. The rear end portions 13Z of the left and right front floor frames 13, 13 (the right front floor frame 13 is not shown) are joined to the floor cross member 14. A rear floor frame 40 (second floor frame) extending in the vehicle front-rear direction from the floor cross member 14 to the rear is disposed. The rear floor frame 40 is joined to the floor panel 8. Front end portions 40 </ b> F of the left and right rear floor frames 40 are connected to the floor cross member 14.
The floor portion of the vehicle body is composed of the above-described floor panel 8, floor tunnel 20, side sill 7, and the like.

  A pair of left and right front side frames 10 (the right front side frame 10 is not shown) extending toward the front side of the vehicle body are disposed on the left and right of the front portion of the vehicle 1. The left and right front side frames 10, 10 extend inward of the vehicle width direction from the left and right side sills 7, 7 and extend forward from the position substantially overlapping the front floor frame 13. One end of an outrigger (not shown) extending outward in the vehicle width direction is joined to the rear end portion 10Z of each of the left and right front side frames 10. The other end of the outrigger is joined to the front end portions of the corresponding left and right side sills 7. Further, the rear end portions 10Z of the left and right front side frames 10 are connected to the front end portions 13F of the left and right front floor frames 13 with a dashboard panel 12 described later interposed therebetween.

  A pair of left and right rear side frames 17 extending toward the rear side of the vehicle body are joined to the vehicle width direction inner side portions of the rear ends of the left and right side sills 7. Between the rear end portion 8Z of the floor panel 8, that is, between the front end portions of the left and right rear side frames 17, a bulkhead cross member 15 extending in the vehicle width direction and having a closed cross section 58 is disposed. The left and right rear side frames 17 are connected to each other by a bulkhead cross member 15. A bulkhead panel 16 that rises upward from the rear end of the floor panel 8 is joined to the front surface of the bulkhead cross member 15. In the present embodiment, the bulkhead cross member 15 and the bulkhead panel 16 constitute the rear partition wall 6. The rear end portions of the left and right rear floor frames 40 are connected to the bulkhead cross member 15.

FIGS. 3 and 4A are views of the front floor frame 13 and the structure in the vicinity thereof as viewed from obliquely above the passenger compartment 2. FIG. 4B is a view of the front floor frame 13 and the structure in the vicinity thereof as viewed from the side of the passenger compartment 2. 4A and 4B, the dashboard panel 12 is omitted for convenience of illustration.
The front floor frame 13 includes an upper member 13U and a lower member 13D that form a substantially U-shaped cross section, and the upper member 13U and the lower member 13D are joined to each other with the floor panel 8 interposed therebetween. It consists of

  As shown in FIGS. 2, 3, 4 </ b> A, and 4 </ b> B, the upper end portion 13 </ b> T of the upper member 13 </ b> U is provided with a ridge line 31 (first ridge line) that extends in the vehicle front-rear direction. In the illustrated example, the upper end portion 13T has an upper surface 36 and a pair of ridge lines 31A and 31B (first ridge lines). The ridge lines 31 </ b> A and 31 </ b> B are formed at both ends of the upper surface 36.

  As shown in FIGS. 3 and 4A, the front end portion 13F of the upper member 13U is formed with a curved portion 42 that rises upward as it moves forward. The rising shape of the curved portion 42 is set in accordance with the shape of the dashboard panel 12. The dashboard panel 12 is connected to the front portion of the floor panel 8 and is mounted so as to rise upward from the front end portion of the floor panel 8. The curved portion 42 is joined to the rising portion of the dashboard panel 12.

  As shown in FIG. 4A and FIG. 4B, a curved portion 43 that rises upward as it goes forward is formed at the front end of the lower member 13D. The rising shape of the bending portion 43 is set along the bending portion 42 and in accordance with the shape of the dashboard panel 12. The bending portion 43 extends forward from the bending portion 42. A closed section 49 is formed by joining the left and right opening edges of the upper member 13U and the left and right opening edges of the lower member 13D.

FIG. 5 is a view of the front floor frame 13 and the structure in the vicinity thereof as seen from the outer side surface of the passenger compartment 2.
As shown in FIG. 5, the joint 44 between the upper member 13 </ b> U and the lower member 13 </ b> D is inclined downward as it proceeds to the rear of the floor panel 8. As the joint 44 is lowered (inclined), the floor panel 8 is also inclined downward. The lowering of the joint 44 is completed in front of the floor cross member 14, and the rear end 44 </ b> Z of the joint 44 is disposed in front of the floor cross member 14. The lower member 13D disappears in the rear end 44Z, that is, in front of the floor cross member 14.
Accordingly, the rear end portion 13Z of the upper member 13U is connected over the vertical width of the floor cross member 14. In this embodiment, the upper member 13U is joined to the floor cross member 14, and the lower member 13D is not connected.

The floor cross member 14 has an upper member 14U that forms a substantially U-shaped cross section, and is formed by joining left and right opening edges of the upper member 14U onto the floor panel 8. A closed section 45 is formed by joining the upper member 14U and the floor panel 8 together.
A ridgeline 32 (second ridgeline) extending in the vehicle width direction is provided at the upper end portion 14T of the floor cross member 14. The rear end portion 31Z of the ridge line 31 of the upper member 13U is connected to the vicinity of the ridge line 32. Further, the floor cross member 14 is provided in front of the floor panel 8 with respect to the ridgeline 32 and includes an inclined surface 34 that is inclined downward as it advances forward. The ridge line 32 is disposed behind the inclined surface 34.
The rear end portion 13Z of the upper member 13U is connected to at least the inclined surface 34. Further, the rear end portion 13Z of the upper member 13U joins the upper surface 36 and the ridge lines 31A and 31B to the floor cross member 14. From the viewpoint of increasing the proof strength of the vehicle 1 against the impact load at the time of a front collision, as shown in FIG. It is preferable that the connecting portion 47 is joined in the vicinity of the inclined surface 34 and the upper end portion 14T.

FIG. 6 is a view of the rear floor frame 40 and the structure in the vicinity of the rear floor frame 40 as viewed from the diagonally upper side of the passenger compartment 2. FIG. 7 is a view of the rear floor frame 40 and the structure in the vicinity thereof as viewed from the side of the passenger compartment 2.
As shown in FIG. 6, the rear floor frame 40 includes an upper member 40U that forms a substantially U-shaped cross section, and is formed by joining left and right opening edges of the upper member 40U onto the floor panel 8. Yes. A closed cross section (not shown) is formed by joining the upper member 40U and the floor panel 8. On the upper part of the upper member 40U, a ridge line 50 extending in the vehicle front-rear direction is provided. In the illustrated example, the ridge line 50 includes a pair of ridge lines 50A and 50B.

As shown in FIG. 7, the rear end portion 40Z of the rear floor frame 40 is formed with a curved portion 52 that rises upward as it goes rearward. The rising shape of the bending portion 52 is set according to the shape of the bulkhead panel 16.
As shown in FIGS. 2 and 6, the rear floor frame 40 is disposed at a position that substantially overlaps the front floor frame 13 in the vehicle width direction.

  In front of the closed cross section 58 of the bulkhead panel 16, an inclined surface is formed along the rising shape of the curved portion 52. The curved portion 52 of the rear floor frame 40 is joined to the inclined surface.

The vehicle lower structure 60 according to the present embodiment described above is disposed on the floor panel 8 provided on the floor of the passenger compartment 2 provided with the seat S on which the passenger of the vehicle 1 rides, and the vehicle width direction center portion, The floor tunnel 20 extending in the front-rear direction, the side sill 7 disposed at both ends in the vehicle width direction and extending in the vehicle front-rear direction, and joined to the floor panel 8 and between the floor tunnel 20 and the side sill 7 A floor cross member 14 extending in the vehicle width direction, and a front floor frame 13 extending from the front of the floor panel 8 to the floor cross member 14 in the vehicle front-rear direction.
In the vehicle lower structure 60 according to the present embodiment, the front floor frame 13 includes an upper member 13U and a lower member 13D, and the upper member 13U and the lower member 13D via the floor panel 8, As a result, the front floor frame 13 forms a closed section 49. The seam 44 between the upper member 13U and the lower member 13D is inclined downward as it advances to the rear of the floor panel 8, and the floor panel 8 is also inclined downward according to this inclination, so that the upper member 13U is located above and below the floor cross member 14. Connected across the width.
As described above, for example, when a large impact load is input from the front side of the vehicle 1, the impact load is input to the front floor frame 13 and transmitted in the longitudinal direction of the front floor frame 13, and the rear end of the front floor frame 13 To the floor cross member 14 continuously. The impact load transmitted to the floor cross member 14 is efficiently distributed to the floor tunnel 20 and the side sill 7 arranged on both sides. As a result, the front collision performance of the vehicle 1 can be improved. Further, for example, the floor panel 8 is inclined downward in front of the floor cross member 14, so that the seat S can be placed at a lower position and the seating point of the seat S can be lowered. Therefore, the height of the vehicle 1 can be suppressed and the air resistance applied to the vehicle 1 can be reduced.

  Further, in the vehicle lower structure 60 of the present embodiment, a ridge line 31 extending in the vehicle front-rear direction is provided at the upper end portion 13T of the upper member 13U, and extends in the vehicle width direction at the upper end portion 14T of the floor cross member 14. The ridge line 32 is provided, and the rear end portion 31Z of the ridge line 31 is connected to the vicinity of the ridge line 32. Therefore, for example, the impact load transmitted to the front floor frame 13 is continuously transmitted from the ridge line 31 to the ridge line 32 along the strong ridge line (that is, the corner) at the time of the front collision, so that the large impact load Can be efficiently dispersed by the floor cross member 14, the floor tunnel 20, and the side sill 7.

  Further, in the vehicle lower structure 60 of the present embodiment, the floor cross member 14 includes an inclined surface 34 that is disposed in front of the floor panel 8 from the ridge line 32 and is inclined downward as it advances forward, and the rear end portion of the upper member 13U. 31Z is connected to at least the inclined surface. Therefore, the rear end portion of the front floor frame 13 covers the inclined surface 34 even when the inclined surface is required for the floor cross member 14 to fix the parts such as the seat S to the floor panel 8. Since the ridgeline 31 and the ridgeline 32 are connected in a connected state, for example, the impact load input to the front floor frame 13 at the time of the front collision is transmitted to the ridgeline 31 and transmitted to the floor cross member, The floor tunnel 20 and the side sills 7 connected to both ends of the floor cross member 14 can be more efficiently dispersed.

  Further, in the vehicle lower structure 60 of the present embodiment, the upper end portion 13T of the upper member 13U has the upper surface 36 and a pair of ridge lines 31A and 31B formed at both ends of the upper surface 36, and the rear of the upper member 13U. The end portion 13Z joins the upper surface 36 and the ridge lines 31A and 31B to the floor cross member 14. Thus, since the upper surface 36 and the pair of ridge lines 31A and 31B are respectively connected to the floor cross member 14, for example, the impact load input to the front floor frame 13 at the time of the front collision is applied to the upper surface 36 and the ridge lines 31A and 31B. Can be efficiently dispersed by the floor cross member 14, the floor tunnel 20, and the side sill 7.

  Further, in the vehicle lower structure 60 of the present embodiment, the front side frame 10 is provided on the left and right of the vehicle body front portion of the vehicle 1, and the rear end portion 10 </ b> Z of the front side frame 10 is connected to the front end portion 13 </ b> F of the front floor frame 13. Yes. For this reason, for example, most of the impact load at the time of the front collision is transmitted to the rear side after being input to the front side frame 10, so this large impact load is continuously transmitted from the front side frame 10 to the front floor frame 13. Further, the floor cross member 14, the floor tunnel 20 and the side sill 7 can be efficiently dispersed.

  Further, in the vehicle lower structure 60 of the present embodiment, the vertical width of the front floor frame 13 is substantially constant over the vehicle front-rear direction. Therefore, for example, the transmission efficiency of the impact load input to the front floor frame 13 at the time of a front collision can be improved, and an increase in the vertical width of the front floor frame 13 can be suppressed. Therefore, the height of the vehicle 1 can be suppressed more reliably.

  Further, the vehicle lower structure 60 of the present embodiment includes a rear floor frame 40 that is joined to the floor panel 8 and extends from the floor cross member 14 toward the rear of the floor panel 8, and the rear floor frame 40 is in the vehicle width direction. Are arranged at positions overlapping the front floor frame 13. Therefore, for example, the impact load input to the front floor frame 13 at the time of the front collision can be efficiently and continuously transmitted to the rear floor frame 40 via the floor cross member 14. Further, since the rear portion of the floor panel 8 is reinforced by the rear floor frame 40, distortion, twisting, and vibration of the rear portion of the floor panel 8 can be suppressed. Therefore, the front collision performance of the vehicle 1 can be significantly improved.

  Further, in the vehicle lower structure 60 of the present embodiment, a closed cross section 58 extending in the vehicle width direction is formed at the rear end 8Z of the floor panel 8, and the rear end 40Z of the rear floor frame 40 is a closed cross section. 58 is joined in the vicinity. Therefore, the impact load transmitted to the rear floor frame 40 can be continuously transmitted to the closed cross section 58 and can be more efficiently distributed in the vehicle width direction. In addition, since the rear floor frame 40 is connected to the floor cross member 14 and the high-strength closed section 58, distortion, twisting, and vibration of the rear portion of the floor panel 8 can be further suppressed.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Passenger compartment 7 ... Side sill 8 ... Floor panel 8Z, 10Z, 31Z, 40Z ... Floor panel 10 ... Front side frame 10Z, 13Z, 31Z ... Rear end part 13 ... Front floor frame (first floor frame)
13D ... Lower member 13U ... Upper member 13F ... Front end 14 ... Floor cross member 14T, 31T ... Upper end 20 ... Floor tunnel 31, 31A, 31B ... Ridge line (first ridge line)
32 ... Ridge line (second ridge line)
34 ... Inclined surface 36 ... Upper surface 40 ... Rear floor frame (second floor frame)
44 ... Joint 49 ... Closed section 58 ... Closed section 60 ... Undercarriage structure S ... Seat

Claims (8)

A floor panel provided on the floor of a passenger compartment equipped with a seat on which a vehicle occupant rides, a floor tunnel disposed in the center in the vehicle width direction and extending in the vehicle longitudinal direction, and disposed at both ends in the vehicle width direction A side sill extending in the vehicle longitudinal direction, a floor cross member joined to the floor panel and extending in the vehicle width direction between the floor tunnel and the side sill, and the floor panel A first floor frame extending in the vehicle front-rear direction across the floor cross member from the front, and
The first floor frame has an upper member and a lower member,
The first floor frame forms a closed cross section by joining the upper member and the lower member via the floor panel,
The seam of the upper member and the lower member is inclined downward as it advances rearward of the floor panel, and the floor panel is also inclined downward according to this inclination, and the rear end portion of the upper member is the floor cloth. A vehicle lower structure characterized by being connected over the vertical width of a member. A first ridge line extending in the vehicle front-rear direction is provided at the upper end of the upper member,
A second ridge line extending in the vehicle width direction is provided at the upper end of the floor cross member,
The vehicle lower structure according to claim 1, wherein a rear end portion of the first ridge line is connected in the vicinity of the second ridge line. The floor cross member includes an inclined surface that is disposed in front of the floor panel from the second ridge line and is inclined downward as it advances forward,
The vehicle lower structure according to claim 2, wherein a rear end portion of the upper member is connected to at least the inclined surface. The upper end of the upper member has an upper surface and a pair of the first ridge lines formed at both ends of the upper surface,
The vehicle lower structure according to claim 2, wherein a rear end portion of the upper member joins the upper surface and the pair of first ridge lines to the floor cross member. Front side frames are provided on the left and right of the vehicle front part of the vehicle,
The vehicle lower structure according to any one of claims 1 to 4, wherein a rear end portion of the front side frame is connected to a front end portion of the first floor frame.   The vehicle lower structure according to any one of claims 1 to 5, wherein the vertical width of the first floor frame is substantially constant over the vehicle longitudinal direction. A second floor frame that is joined to the floor panel and extends from the floor cross member toward the rear of the vehicle,
The vehicle lower structure according to any one of claims 1 to 6, wherein the second floor frame is disposed at a position overlapping the first floor frame in a vehicle width direction. A closed cross section extending in the vehicle width direction is formed at the rear end of the floor panel,
The vehicle lower structure according to claim 7, wherein a rear end portion of the second floor frame is joined in the vicinity of the closed cross section.

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