JP6222123B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention includes left and right side sills extending in the vehicle front-rear direction outside the vehicle width direction of the vehicle body, a floor panel connected to the left and right side sills, and a floor tunnel bulging upward at the center of the floor panel. The present invention relates to a lower body structure of a vehicle provided.

In recent years, there has been a demand for further improvement in the side collision safety performance of the lower body structure of the vehicle. For example, the lower body structure of a vehicle in Patent Documents 1 and 2 has been proposed for the purpose of achieving the side collision safety performance.
The lower vehicle body structure disclosed in Patent Document 1 includes a first oblique cross member having a cross member as an X-shaped tunnel member in plan view, a rear end of a front side frame, a coupling portion of a B pillar and a side sill. Are arranged so as to be coupled on both sides in the vehicle width direction.

  Further, Patent Document 1 has an effect that the input load input to the side sill at the time of a side collision can be distributed and transmitted to the side sill 12 on the opposite side in the vehicle width direction by the first oblique cross member. It has been broken.

  However, Patent Document 1 does not mention anything about a side collision load being distributed and transmitted without deviation in the direction of the side sill on the side opposite to the vehicle width direction at the time of a side collision.

  Further, in contrast to the above-described Patent Document 1 in which the lower body structure of a vehicle provided with a cross member as an X-shaped tunnel member is disclosed, the lower body of the vehicle provided with a tunnel member extending linearly in the vehicle width direction. The structure is disclosed in Patent Document 2 (see FIG. 1 in Patent Document 2).

  However, although the lower body structure of the vehicle of Patent Document 2 can be seen to perform load transmission by a load path including a tunnel member that extends linearly at the time of a frontal collision such as an offset collision, it extends in this linear shape. There is no disclosure about load transmission in a side collision by a load path including a tunnel member.

JP 2008-230417 A JP 2008-230460 A

SUMMARY OF THE INVENTION Accordingly , an object of the present invention is to distribute and transmit a side impact load in a direction having a side sill on the side opposite to the vehicle width direction without a large deviation.

The vehicle lower body structure according to the present invention includes left and right side sills extending in the vehicle front-rear direction outside the vehicle width direction of the vehicle body, a floor panel connected to the left and right side sills, and a bulge upward at the center of the floor panel. And a tunnel member having a linear portion that is arranged to connect the left and right lower portions of the floor tunnel and extends substantially linearly in the vehicle width direction. A front floor inclined member extending inward in the vehicle width direction from the side sill and extending inward in the vehicle width direction and connected to the vicinity of the end of the tunnel member in the vehicle width direction in a vehicle plan view, and the vehicle front and rear of the front floor inclined member In the rear of the direction, the rear frame extends inwardly in the vehicle width direction from the side sill and is connected to the vicinity of the end of the tunnel member in the vehicle width direction when viewed from above. And A inclined member, but is arranged, the front floor front end of the inclined member is coupled to the side sill via the torque box, a rear portion of the front floor tilt member, said tunnel member in the vehicle longitudinal direction of the tunnel side frames Is connected to the position in the vicinity of the end in the vehicle width direction.

  According to the above-described configuration, when a load is transmitted from the tunnel member to the front and rear of the vehicle via the front and rear inclined members at the time of a side collision, the load can be distributed and transmitted without significant deviation.

Here, the end portion in the vehicle width direction of the tunnel member in the plan view of the vehicle described above, the front floor inclined member, or, the rear floor inclined member is in plan view of the vehicle tunnel member and the longitudinal direction, and vehicle The position is not limited to a position that completely coincides with the width direction, and may be a position that has an overlap in the front-rear direction in the vehicle plan view and an overlap in the vehicle width direction in the vehicle front view.

According to another embodiment of the present invention, with the front floor inclined member and the rear floor inclined member, in plan view of the vehicle, with a substantially V-shape, these rectilinear portions and the vehicle plane of the tunnel member It is characterized by being substantially Y-shaped in view.

  According to the said structure, it can be set as the structure which made the site | part connected to the tunnel member in the front and back both inclined members (the said front floor inclined member and the said back floor inclined member) approached, and, thereby, the above-mentioned Claim 1. It is possible to further enhance the effect.

Further, in one embodiment of the invention, the front floor inclined member is disposed below the floor panel, in which the rear floor inclined member is disposed on an upper portion of the floor panel.

According to the above configuration, an on-floor cross member (for example, an inclined No. 2 cross member) is disposed above the floor panel at a position where the rear floor inclined member is disposed in the vehicle plan view of the floor panel. In the lower vehicle body structure, the above-mentioned cross member on the floor can be used as the rear floor inclined member disposed at the upper part of the floor panel. Thus, lightweight construction, according to claim 1 described above, or it is possible to obtain the effects described in 2.

  Here, as described above, the front floor inclined member is preferably disposed at the lower part of the floor panel, and the rear floor inclined member is preferably disposed at the upper part of the floor panel. For example, both the front floor inclined member and the rear floor inclined member may be disposed in the lower part of the floor panel. Furthermore, both the front floor inclined member and the rear floor inclined member may be disposed on the upper portion of the floor panel, and the front floor inclined member is disposed on the upper portion of the floor panel. It is good also as a structure arrange | positioned by the lower part.

  According to the present invention, the side impact load can be distributed and transmitted in the direction of the side sill opposite to the vehicle width direction without a large deviation.

The bottom view of the lower body structure of this vehicle. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The perspective view which looked at the front side tunnel member from the downward direction. Explanatory drawing at the time of the side collision in the lower vehicle body structure of this vehicle. The bottom view of the lower body structure of the vehicle of other Examples.

An embodiment of the present invention will be described in detail with reference to the drawings.
In the drawing, an arrow (F) indicates the front of the vehicle body, an arrow (U) indicates the upper side of the vehicle body, an arrow (IN) indicates the inside of the vehicle body, and an arrow (OUT) indicates the outside of the vehicle body.

  As shown in FIG. 1, the vehicle V according to the present embodiment includes a dash panel 1 that partitions an engine room E and a passenger compartment (not shown), and a floor panel 2 that forms the bottom surface of the passenger compartment. The dash panel 1 is disposed so as to rise from the front end of the floor panel 2. The vehicle V includes a pair of side sills 3 and 3 extending in the vehicle front-rear direction on both outer sides of the floor panel 2 in the vehicle width direction.

Side sill 3, as shown in FIG. 2, has a predetermined closed section structure, as shown in FIG. 1, extending respectively the vehicle longitudinal direction at the edges of both sides in the vehicle width direction of the vehicle V. A floor panel 2 is connected to the side sills 3 and 3 on both sides in the vehicle width direction (see FIGS. 1 and 2). Specifically, the side sill 3 has an inner panel 3n having a U-shaped cross section, and an outer panel 3u. The upper and lower ends of the panels 3n and 3u are joined together to form a closed cross section. The outer end of the floor panel 2 in the vehicle width direction is joined to the lower part of the side wall surface (see FIG. 2).

  As shown in FIG. 2, the vehicle V is provided with a hinge pillar 4 extending upward from the front position of the side sill 3 and a center pillar 5 extending upward from an intermediate position in the front-rear direction of the side sill 3.

  The hinge pillar 4 includes a hinge pillar outer 4u and a hinge pillar inner 4n, has a closed cross section extending in the vertical direction, and is a vehicle body rigid member that supports a front door (not shown) so as to be openable and closable. A hinge pillar reinforcement 4r is provided between the hinge pillar outer 4u and the hinge pillar inner 4n, as needed, between the side rail (not shown) and the side sill 3. 2).

  In addition, the coupling | bond part (the skirt part of the hinge pillar 4) to the side sill 3 of the hinge pillar 4 is formed so that it may have a width | variety in the vehicle rear direction gradually from the front end of the side sill 3 as it progresses to the lower end part of this hinge pillar 4.

The center pillar 5 includes a center pillar outer 5u and a center pillar inner 5n, has a closed cross section extending in the vertical direction, and is a vehicle body rigid member that supports a rear door (not shown) so that it can be opened and closed. 5 is erected and fixed between a roof side rail (not shown) and the side sill 3 (see FIG. 2).
It should be noted that the connecting portion of the center pillar 5 to the side sill 3 (the bottom portion of the center pillar 5) gradually has a width in the vehicle front-rear direction with respect to the substantially middle position of the side sill 3 as it proceeds to the lower end of the center pillar 5. Is formed.

  As shown in FIG. 1, the vehicle V includes a pair of left and right front side frames 7 and 7 that extend in the longitudinal direction of the vehicle body at the side of the engine room E at the front portion of the dash panel 1. The front side frame 7 has a closed cross-sectional structure with a square cross section (not shown). As shown in FIG. 1, the rear side portion of the front side frame 7 is coupled to the lower portion of the dash panel 1. A front side frame extension 11 that extends continuously inward in the vehicle width direction from the rear end and connects to the front of a tunnel side frame 9 described later is provided on the floor at the rear end of the front side frame 7. It is provided at the bottom of the panel 2.

  As shown in FIG. 1, the front side frame extension 11 has a lower surface (back surface) of the floor panel 2 so as to form a front side frame extension closed section 11 </ b> S with the lower surface (back surface) of the floor tunnel 8. ).

  As shown in FIGS. 1 and 2, the floor panel 2 includes a floor tunnel 8 that extends in the longitudinal direction of the vehicle body and bulges upward (toward the vehicle compartment side). The front end of the floor tunnel 8 is connected to the dash panel 1.

  As shown in FIGS. 1 and 2, a pair of left and right tunnel side frames 9, 9 that reinforce the floor tunnel 8 are attached to both edges of the floor tunnel 8 at the lower part of the floor panel 2. Specifically, the tunnel side frames 9 and 9 on both sides in the vehicle width direction extend linearly in the vehicle front-rear direction at the boundary region between the floor panel 2 and the flat portions on both outer sides in the vehicle width direction of the floor tunnel 8. The tunnels 8 are arranged substantially parallel to each other with an interval substantially equal to the dimension in the vehicle width direction of the tunnel 8.

  As shown in FIG. 2, the tunnel side frame 9 has a U-shaped portion 9 a having a substantially U-shape (hat-shaped cross section) with an upper opening in a cross section perpendicular to the vehicle longitudinal direction. The lower surface portion of the floor tunnel 8 is formed from the bottom surface portion 91, the outer surface portion 92, and the inner surface portion 93, and forms the tunnel side frame closed section 9S with the lower surface portion (back surface) of the floor tunnel 8 in detail. Are attached to the lower surface at the boundary between the floor tunnel 8 and the floor panel 2.

  Further, rear side frames (not shown) extending in the front-rear direction of the vehicle V are disposed on both outer sides in the vehicle width direction behind the floor panel 2 of the lower body structure of the vehicle V, and the pair of left and right rear side frames. The front end of each of the two is connected to the rear end of the side sill 3 (not shown).

  As shown in FIG. 1, a torque box 15 extending from the rear to the rear side in the vehicle width direction is disposed at the rear of the front side frame 7 on each side in the vehicle width direction. These torque boxes 15 are vehicle body rigidity members that increase the rigidity of the vehicle body, and are disposed below the floor panel 2 so as to have a closed cross-section portion 15S that effectively transmits the load applied to the front side frame 7 to the side sill 3. Further, the outer end in the vehicle width direction is directly coupled to the side sill 3.

  Further, as shown in FIGS. 1 and 2, the upper surface of the floor panel 2 is inclined outwardly in the vehicle width direction so as to form a closed cross section with the upper surface in the vehicle longitudinal direction. A pair of left and right front and rear members 16 (floor frame 16) are disposed. The pair of left and right front and rear members 16 are disposed at a position overlapping the branch portion D between the torque box 15 and the front side frame extension 11 disposed on the lower surface of the floor panel 2 at the rear of the front side frame 7 in plan view. (See FIG. 1).

  The rear part of the front and rear members 16 is connected to a substantially middle part of a rear floor inclined member 32 described later (see the same figure).

  In addition, the code | symbol 17 in FIG. 1 is a sheet | seat support member which supports the front-end part of the rail-shaped seat bracket (illustration omitted) arrange | positioned on the outer side of a vehicle width direction, This sheet | seat support member 17 is shown in FIG. As described above, it is disposed in front of the rear floor inclined member 32 at the upper part of the floor panel 2 so as to protrude inward in the vehicle width direction from the side sill 3, and the inner end in the vehicle width direction of the seat support member 17 is Coupled to member 16.

  As shown in FIG. 1, a pair of left and right aprons are located at a front portion of the vehicle V that is substantially parallel to the front side frame 7 in a plan view and spaced outwardly and upward in the vehicle width direction. A reinforcement 18 (hereinafter abbreviated as “apron rain 18”) extends in the longitudinal direction of the vehicle body.

  The apron rain 18 is a vehicle body rigid member that has an apron rain closed section that has a rear end joined to an upper end of the hinge pillar 4 and extends in the vehicle front-rear direction.

  Further, as shown in FIG. 1, on the upper part of the floor panel 2, there is a cross extending linearly in the vehicle width direction and connected to the side sill 3 and the floor tunnel 8 at substantially the same position as the center pillar 5 in the vehicle longitudinal direction. A member 30 (No. 2.5 cross member 30) is provided.

  The cross member 30 is attached to the upper surface portion (back surface) of the floor panel 2 so as to form a cross member closed section 30S between the upper surface portion (back surface) of the floor tunnel 8 (see FIG. 1).

  Further, at the lower part of the vehicle V, as shown in FIG. 1, CFr, CFl in the vicinity of the coupling part between the side sill 3 and the hinge pillar 4, and the side sill 3 and the center pillar on the opposite side of the coupling part CFr, CFl in the vehicle width direction. Inclined members 20, 31, and 32 that connect the vicinity of the binding site with CR 5 and CRr are provided. The inclined members 20, 31, and 32 are configured so that the front tunnel member 20, the front floor inclined member 31, and the rear floor inclined member 32 as a whole have a substantially X shape in a vehicle plan view.

  The front tunnel member 20 is a member corresponding to an intersection of the substantially X-shaped inclined members 20, 31, 32 in the vehicle bottom view, and the front floor inclined member 31 is connected to the tunnel side frame 9 in the vehicle front-rear direction. 2 (see FIGS. 1 to 3), and is disposed at substantially the same position as the position where the rear floor inclined member 32 overlaps the tunnel side frame 9 in the vehicle longitudinal direction (FIG. 2). reference).

  As shown in FIGS. 1 to 3, the front side tunnel member 20 is disposed in the lower part of the floor tunnel 8 across the floor tunnel 8 in the floor panel 2, and connects the both sides in the vehicle width direction. A linear portion 21 extending in a substantially linear shape is configured so that a load from the rear floor inclined member 32 or a load from the front floor inclined member 31 is applied to the lower portion of the floor tunnel 8 in the vehicle width direction. It tells the other side.

  As shown in FIGS. 2 and 3, the front tunnel member 20 includes a first surface portion 261 extending in the vehicle width direction so as to face and face the bottom surface portion 91 of the tunnel side frame 9 (tunnel side member 9). A second surface portion 262 that extends upward from the inner end in the vehicle width direction of the first surface portion 261 so as to face and oppose the inner surface portion 93 of the tunnel side frame 9, and inward in the vehicle width direction from the upper end of the second surface portion 262. And a third surface portion 263 extending in the direction.

The front tunnel member 20 includes a lower panel 23 and an upper panel 24 that is positioned above the lower panel 23 and formed in a rectangular shape that is long in the vehicle width direction substantially the same as the lower panel 23 in plan view of the vehicle. (See FIG. 2).
As shown in FIG. 2, the front side tunnel member 20 has the above-described upper panel so that a closed cross section 20 </ b> S (hereinafter referred to as “front side tunnel member closed cross section 20 </ b> S”) is formed inside the linear portion 21. 24 and the lower panel 23 are arranged below the floor tunnel 8 with the upper and lower sides facing each other.

  As shown in FIGS. 1 to 3, the front tunnel member 20 is fastened by bolts B and nuts N at front and rear portions of both outer edges in the vehicle width direction of the floor tunnel 8 in the floor panel 2. The front tunnel member 20 is fastened to the tunnel side frame 9 in the fastening portion 25 (25u, 25n) in a state where the upper panel 24 and the lower panel 23 are integrated together by fastening with bolts B and nuts N. Yes.

  At this time, the first surface portion 261 of the front tunnel member 20 and the bottom surface portion 91 of the tunnel side frame 9 face each other, and the second surface portion 262 of the front tunnel member 20 and the inner surface portion 93 of the tunnel side frame 9 face each other ( (See FIG. 2).

  Specifically, as shown in FIG. 3, the front side tunnel member 20 fastens the first surface portion 261 to the bottom surface portion 91 of the tunnel side frame 9 with the bolt B and the nut N, and also connects the third surface portion 263 to the floor tunnel 8. It is attached to the vehicle body by fastening it via a bracket 29.

  Here, the fastening portion 25 that fastens the first surface portion 261 to the bottom surface portion 91 of the tunnel side frame 9 is set as the outer fastening portion 25u, and the fastening portion 25 that fastens the third surface portion 263 to the floor tunnel 8 is the inner fastening portion. Set to 25n.

  At this time, on both sides of the front tunnel member 20 in the vehicle width direction, the outer fastening portion 25u and the inner fastening portion 25n provided on each side of the vehicle front and rear are respectively attached at substantially the same position in the vehicle front-rear direction ( (See FIGS. 1 and 3).

Next, the front floor inclined member 31 described above will be described with reference to FIGS.
The front floor inclined member 31 is a member located on the vehicle front side of the front tunnel member 20 in the substantially X-shaped inclined members 20, 31, 32 in the vehicle bottom view, and is a vehicle with respect to the floor tunnel 8 in the floor panel 2. A pair is provided on both outer sides in the width direction.

  The front floor inclined member 31 has a U-shaped portion with an upper opening, and has flange portions extending from the opening side end portions to both outer sides in the vehicle width direction. These flange portions are formed on the floor panel 2. 2, a closed cross section 31S (hereinafter referred to as a “front floor inclined member closed cross section 31S”) is formed between the lower surface of the floor panel 2 and the lower surface of the floor panel 2, as shown in FIG. The floor panel 2 is disposed below.

As shown in FIG. 1, the front end of the front floor inclined member 31 is coupled to the front end of the side sill 3 via a torque box 15.
As shown in FIGS. 1 to 3, the front floor inclined member 31 extends from the front end of the side sill 3, specifically, from the vicinity of the coupling portion CFr, CFl between the side sill 3 and the hinge pillar 4, inclining inward in the vehicle width direction toward the rear side. The rear portion of the tunnel side frame 9 in the vehicle front-rear direction is in the vicinity of the end of the front tunnel member 20 in the vehicle width direction, that is, the front floor inclined member 31 is outside the front tunnel member 20 in the vehicle width direction in plan view of the vehicle. The end portion is connected to a position overlapping the front-rear direction and the vehicle width direction.

  Further, as shown in FIG. 1, the rear floor inclined member 32 (inclined No. 2 cross 32) described above is more than the front tunnel member 20 in the substantially X-shaped inclined members 20, 31, 32 in a vehicle bottom view. A member located on the rear side of the vehicle, and a pair is provided on both outer sides in the vehicle width direction with respect to the floor tunnel 8 of the floor panel 2.

  The rear floor inclined member 32 has a U-shaped portion having a downward opening, and has flange portions extending from the opening side end portions to both outer sides in the vehicle width direction. These flange portions are formed on the floor panel 2. As shown in FIG. 2, a closed cross-section portion 32S (hereinafter referred to as “rear floor inclined member closed cross-section portion 32S”) is formed between the upper surface portion and the upper surface portion of the floor panel 2. As shown in FIG.

  The rear rear inclined member 32 is joined to the vicinity of the binding sites CRl and CRr of the side sill 3 and the center pillar 5 at the outer rear portion, in other words from the vicinity of the binding sites CRl and CRr. From the front position of the part vicinity C30 (see FIG. 1), the front side extends in an inward direction in the vehicle width direction.

  As shown in FIGS. 1 to 3, the front portion of the rear floor inclined member 32 is located near the end in the vehicle width direction of the front tunnel member 20 at the edge of the floor tunnel 8 in the vehicle width direction, that is, the vehicle plane. The end portion of the front tunnel member 20 in the vehicle width direction is connected to a position overlapping the front and rear direction and the vehicle width direction.

  That is, as shown in FIG. 2, the rear floor inclined member closed cross section 32S and the front tunnel member are closed at the joint portion of the front end of the rear floor inclined member 32 to the edges on both sides in the vehicle width direction of the floor tunnel 8. The cross section 20S is formed so as to overlap in the vehicle width direction when the vehicle is viewed from the front.

  The front floor inclined member 31 and the rear floor inclined member 32 described above are substantially V-shaped in a plan view of the vehicle as shown by a frame structure L1 indicated by a virtual line in FIG. The front floor inclined member 31 and the rear floor inclined member 32, which are substantially V-shaped in a plan view, and the linear portion 21 of the front tunnel member 20 are as shown in the frame structure L2 shown in phantom lines in FIG. Furthermore, it is arrange | positioned in the lower part of the floor panel 2 so that a substantially Y shape may be made | formed by vehicle planar view.

Further, as shown in FIG. 1, the floor tunnel 8 has a rear side position relative to the front side tunnel member 20, more specifically, the floor tunnel 8 at the same position in the vehicle longitudinal direction as the position where the cross member 30 is disposed. A straight rear tunnel member 40 that connects both sides in the vehicle width direction on the lower surface of the floor tunnel 8 of the floor panel 2 is disposed across the tunnel 8. The rear side tunnel member 40 is continuously arranged in a substantially straight line with the cross member 30 extending in the vehicle width direction in the vehicle plan view (see the same figure).
The rear tunnel member 40 is composed of an upper panel (not shown) and a lower panel 40D, and these panels are joined to each other vertically to close the linear rear tunnel member inside along the vehicle width direction. It has a cross section 40S (see the figure).

The lower vehicle body structure of the vehicle V of the present embodiment described in detail above can provide the following operational effects.
The lower vehicle body structure of the vehicle V according to this embodiment includes left and right side sills 3, 3 extending in the vehicle front-rear direction outside the vehicle width direction of the vehicle body, a floor panel 2 connected to the left and right side sills 3, 3, and the floor. A lower body structure of a vehicle having a floor tunnel 8 bulging upward at the center of the panel 2, arranged to connect the left and right lower portions of the floor tunnel 8, and substantially straight in the vehicle width direction A front-side tunnel member 20 having a linearly extending portion, and extending from the side sill 3 toward the rear side toward the inner side in the vehicle width direction and connected to the vicinity of the end portion of the front-side tunnel member 20 in the vehicle width direction in a plan view of the vehicle. The front floor inclined member 31 and the rear side of the front floor inclined member 31 extend from the side sill 3 so as to incline inward in the vehicle width direction from the side sill 3, and in the vicinity of the end of the front tunnel member 20 in the vehicle width direction in plan view of the vehicle The side floor inclined member 32 after being connected, but characterized in that it is arranged (see FIGS. 1 to 3).

  According to the above configuration, when a load is transmitted to the front and rear of the vehicle from the front tunnel member 20 through the front and rear inclined members, that is, the front floor inclined member 31 and the rear floor inclined member 32, in the event of a side collision, It becomes possible to disperse and transmit without large deviation.

  More specifically, according to the above configuration, for example, as shown in FIG. 4, the side impact load F input to the vicinity CRr of the coupling portion between the side sill 3 and the center pillar 5 is changed to the cross member 30 (No. 2.5). The cross member 30) and the rear floor inclined member 32 can be distributed and transmitted (see loads F1 and F2 in FIG. 4). The load transmitted to the rear floor inclined member 32 can be distributed and transmitted to the front floor inclined member 31 and the rear floor inclined member 32 on the opposite side in the vehicle width direction via the front tunnel member 20. (See loads F3, F4, and F5 in FIG. 4).

  As described above, when the side impact load input to the side sill 3 on the one side in the vehicle width direction is transmitted to the side sill 3 on the opposite side in the vehicle width direction, the side impact load is increased in the vehicle width direction. Are distributed and transmitted to the front floor inclined member 31 extending forwardly and outwardly in the width direction and the rear floor inclined member 32 extending inclined rearward and outward in the width direction via the linear front tunnel member 20 along the front side. In this way, it is possible to distribute and transmit without significant deviation.

  According to the aspect of the present invention, the front floor inclined member 31 and the rear floor inclined member 32 are substantially V-shaped in a vehicle plan view (see the frame structure L1 in FIG. 1), and these and the front tunnel. The linear portion of the member 20 is substantially Y-shaped in a vehicle plan view (see the frame structure L2 in FIG. 1).

  According to the above configuration, the front and rear inclined members (the front floor inclined member 31 and the rear floor inclined member are separated from the front tunnel member 20 in the event of a side collision by bringing the front and rear inclined members connected to the front tunnel member 20 closer to each other. When the load is transmitted to the front and rear of the vehicle via the vehicle 32), it is possible to further enhance the above-described effect that the load can be distributed and transmitted without a large deviation.

In addition , according to the aspect of the present invention, the front floor inclined member 31 is disposed at the lower portion of the floor panel 2, and the rear floor inclined member 32 is disposed at the upper portion of the floor panel 2 (FIG. 1, FIG. (See FIG. 2).

  According to the above configuration, the front floor inclined member 31 does not interfere with a front seat (not shown) as a riding seat, and the rear panel inclined member 32 is disposed in the vehicle plan view of the floor panel 2. In the lower part of the vehicle, an upper floor cross member (inclined No. 2 cross member) (not shown) extending obliquely inward in the vehicle width direction from the side sill 3 to the upper side of the floor panel 2 is disposed. In the vehicle body structure, the above-mentioned cross member on the floor can be used as the rear floor inclined member 32 without arranging the rear floor inclined member 32 below the floor panel 2. Therefore, with a light-weight structure, when a load is transmitted from the front tunnel member 20 to the front and rear of the vehicle through the front and rear inclined members in a side collision, the load can be distributed and transmitted without significant deviation.

  In the correspondence between the configuration of the present invention and the above-described embodiment, the tunnel member corresponds to the front tunnel member 20, but the present invention is not limited to the configuration of the above-described embodiment.

  For example, in the embodiment described above, the front floor inclined member 31 is disposed at the lower portion of the floor panel 2 and the rear floor inclined member 32 is disposed at the upper portion of the floor panel 2 (see FIG. 1). Not only the front floor inclined member 31 but also the rear floor inclined member 320 may be arranged below the floor panel 2 as shown in FIG.

Even in the above-described configuration, when a load is transmitted from the front tunnel member 20 to the front and rear of the vehicle via the front and rear inclined members (the front floor inclined member 31 and the rear floor inclined member 32) in a side collision, a large deviation occurs. Without being distributed.

  Alternatively, although not shown, both the front floor inclined member 31 and the rear floor inclined member 32 may be disposed on the upper portion of the floor panel 2, or the front floor inclined member 31 is disposed on the upper portion of the floor panel 2. In addition, the rear floor inclined member 32 may be disposed below the floor panel 2.

  As described above, the present invention, for example, the left and right side sills extending in the vehicle front-rear direction outside the vehicle width direction of the vehicle body, the floor panel connected to the left and right side sills, and the center of the floor panel upward This is useful for a lower body structure of a vehicle provided with a bulged floor tunnel.

V ... Vehicle 2 ... Floor panel 3 ... Side sill 8 ... Floor tunnel
9 ... Tunnel side frame
15 ... Torque box 20 ... Front tunnel member (tunnel member)
21 ... Linear portion 31 ... Front floor inclined member 32, 320 ... Rear floor inclined member

Claims (3)

Left and right side sills extending in the vehicle longitudinal direction outside the vehicle width direction of the vehicle body,
A floor panel connected to the left and right side sills;
A floor tunnel bulging upward at the center of the floor panel;
A lower body structure of a vehicle equipped with
A tunnel member disposed to connect the left and right lower portions of the floor tunnel and having a linear portion extending substantially linearly in the vehicle width direction;
A front floor inclined member extending from the side sill toward the rear side in the vehicle width direction and connected to the vicinity of the end of the tunnel member in the vehicle width direction in a plan view of the vehicle,
The rear side of the front floor inclined member that extends inwardly in the vehicle width direction from the side sill and is connected to the vicinity of the end of the tunnel member in the vehicle width direction when viewed from the top of the vehicle. a floor inclined member, but is arranged,
A front end of the front floor inclined member is connected to a side sill via a torque box;
The lower body structure of a vehicle, wherein a rear portion of the front floor inclined member is connected to a position near an end portion in the vehicle width direction of the tunnel member in a vehicle front-rear direction of a tunnel side frame . The front floor inclined member and the rear floor inclined member are substantially V-shaped in a plan view of the vehicle, and a straight portion of the tunnel member is substantially Y-shaped in a plan view of the vehicle. The lower body structure of a vehicle according to claim 1. The lower body structure of a vehicle according to claim 1, wherein the front floor inclined member is disposed at a lower portion of the floor panel, and the rear floor inclined member is disposed at an upper portion of the floor panel.

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