JP2009248593A - Vehicle body framework structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body framework structure reducing a load burden on a dash cross member at a front side collision of a vehicle. <P>SOLUTION: A front end flange part 56 of an upper reinforcement 50 and a bottom end flange part 68 of a gusset 60 are connected on an upper surface 44A of an evagination part 44 of the dash cross member 40. When the dash cross member 40 receives a load F via a toe board part 16 from a front side member 24 side at the front side collision of the vehicle, the upper reinforcement 50 or the gusset 60 bear a part of the load F. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body skeleton structure including a dash cross member on a cabin side surface of a dash panel.

The vehicle body skeleton structure includes a structure in which a dash cross member is coupled to a dash panel and extends in the vehicle width direction (see, for example, Patent Document 1). In such a structure, a load acting in the axial direction of the front side member (front frame portion) at the time of a frontal collision is input to the dash cross member.
JP 2003-191862 A

  However, in such a structure, for example, if there is no support portion on the rear side of the input position of the dash cross member, the dash cross member generates a bending moment with a rocker or a tunnel as a fulcrum, and the dash cross member The load burden increases.

  An object of the present invention is to obtain a vehicle body skeleton structure that can reduce the load burden of a dash cross member at the time of a frontal collision of a vehicle in consideration of the above facts.

  The vehicle body skeleton structure according to the first aspect of the present invention includes a dash panel having a toe board portion that separates an engine room and a cabin and inclines downward at the rear of the vehicle, and substantially on both sides of the front portion of the vehicle body. A front skeleton portion that extends in the vehicle front-rear direction and is positioned on the vehicle front side of the dash panel, and a kick-up portion that is inclined from the rear end portion of the front skeleton portion to the vehicle rear lower side along the toe board portion A pair of left and right skeleton bodies extending from the rear end portion of the kick-up portion to the vehicle rear side along the lower surface of the vehicle body floor, and the cabin-side surface of the toe board portion The upper and lower flange portions are coupled and extend in the vehicle width direction, and include a bulge portion that bulges toward the cabin and extends in the vehicle width direction between the upper and lower flange portions. Load from front skeleton side A dash cross member that receives the vehicle, and is disposed on the vehicle upper side of the lower part of the kick-up part and the vehicle upper side of the rear skeleton part and extends substantially in the vehicle front-rear direction, and on the cabin side of the lower part of the toe board part. And an upper reinforcement having a front end flange portion coupled to an upper surface of the bulge portion of the dash cross member.

  According to the vehicle body skeleton structure of the first aspect of the present invention, the dash cross member has the upper and lower flange portions coupled to the cabin side surface of the toe board portion and extends substantially in the vehicle width direction, and between the upper and lower flange portions. The bulging part bulges to the cabin side and extends substantially in the vehicle width direction, and at the time of a frontal collision of the vehicle, this dash cross member receives the load from the front skeleton part side via the kick-up part and toe board part receive.

  Here, a front end flange portion of the upper reinforcement is coupled to the upper surface of the bulging portion of the dash cross member, and the upper reinforcement is disposed on the vehicle upper side below the kick-up portion and on the vehicle upper side of the rear skeleton portion. The dash cross member receives a load through the toe board part at the time of a frontal collision of the vehicle because it extends substantially in the vehicle front-rear direction and is connected to the cabin side surface of the toe board part and the upper surface of the vehicle body floor. In some cases, the upper reinforcement supports a part of this load.

  A vehicle body skeleton structure according to a second aspect of the present invention is the vehicle body skeleton structure according to the first aspect, wherein the dash cross member is disposed substantially on the vehicle upper side and on the vehicle rear side of the front skeleton portion in a vehicle plan view. The gusset has a gusset coupled to the cabin side surface of the toe board portion, and a lower end flange portion of the gusset is coupled to an upper surface of the bulging portion of the dash cross member.

  According to the vehicle body skeleton structure of the present invention as set forth in claim 2, the lower end flange portion of the gusset is coupled to the upper surface of the bulging portion of the dash cross member, and the gusset is located substantially on the vehicle upper side of the dash cross member. In addition, since it is arranged on the vehicle rear side of the front skeleton part and is connected to the cabin side surface of the toe board part in a plan view of the vehicle, the sectional height dimension of the skeleton body in the vicinity of the upper flange part of the dash cross member is not large. Even in this case, the cross-sectional height of the gusset near the upper flange portion of the dash cross member supplements the cross-sectional height of the skeleton. Therefore, at the time of a frontal collision of the vehicle, the bending deformation of the skeleton body near the upper flange portion of the dash cross member and the load applied to the dash cross member due to the bending deformation are effectively prevented or suppressed, and the front skeleton is effectively prevented. The load from the side is transmitted to the dash cross member and the upper reinforcement more smoothly.

  As described above, according to the vehicle body skeleton structure of the first aspect of the present invention, there is an excellent effect that the load burden of the dash cross member can be reduced at the time of a frontal collision of the vehicle.

  According to the vehicle body skeleton structure of the second aspect, the load from the front skeleton part side can be more smoothly transmitted to the dash cross member and the upper reinforcement at the time of the frontal collision of the vehicle, Has an excellent effect that can be effectively reduced.

(Configuration of the embodiment)
A vehicle body skeleton structure according to an embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 is a perspective view of the entire configuration of the vehicle body skeleton structure according to the present embodiment as viewed from the cabin 12 side (vehicle interior side) (the vehicle left side portion is not shown). FIG. 2 is a longitudinal sectional view of the main part structure of the vehicle body skeleton structure as viewed from the side of the vehicle. As shown in these drawings, the engine room 10 and the cabin 12 are separated (partitioned) by a dash panel 14.

  As shown in FIG. 1, the upper portion of the dash panel 14 is a vertical plate portion 14A formed in a substantially vertical plate shape, and the lower portion of the dash panel 14 is provided integrally with the vertical plate portion 14A. The toe board portion 16 is formed in an inclined plate shape. The toe board portion 16 is inclined to the lower rear side of the vehicle (toward the lower side of the vehicle toward the rear of the vehicle). As shown in FIG. 2, the lower end portion of the toe board portion 16 is joined and integrated with a front end portion of a floor panel 18 as a vehicle body floor by spot welding or the like. The floor panel 18 constitutes the bottom of the cabin 12.

  Further, as shown in FIG. 1, a dash tunnel portion 14 </ b> C is provided at a substantially central portion in the vehicle width direction of the dash panel 14 and substantially along the vehicle front-rear direction. A floor tunnel portion (not shown) of the floor panel 18 (see FIG. 2) is connected to the rear end side of the dash tunnel portion 14C, and the rear end portion of the dash tunnel portion 14C is joined by spot welding or the like. Thus, it is integrated with the front end of the tunnel-like floor tunnel. The floor tunnel portion (not shown) extends along the vehicle front-rear direction and reinforces the lower part of the body. In addition, a tunnel upper reinforcement 20 (which is an element grasped as a “reinforcing member” in a broad sense) is welded to the upper portion of the tunnel portion 19 constituted by the dash tunnel portion 14C and a floor tunnel portion (not shown). Are bound by. The tunnel upper reinforcement 20 increases the rigidity of the tunnel portion 19 so that a large reaction force can be obtained by the tunnel portion 19 and the tunnel upper reinforcement 20 at the time of frontal collision of the vehicle (support point at the time of frontal collision). Securing).

  A pair of left and right front side members 24 as front skeleton parts (a part of the skeleton body 30) are provided in the vehicle front-rear direction on both sides of the vehicle body front part 22 on the side of the engine room 10 separated by the dash panel 14. The dash panel 14 is located on the vehicle front side. Incidentally, the front side member 24 is formed in a rectangular closed cross-sectional structure and an elongated shape by a front side member inner panel and a front side member outer panel.

  Note that the front end portions of the pair of left and right front side members 24 are connected to each other by a front bumper reinforcement (not shown) arranged with the vehicle width direction as a longitudinal direction. The front bumper reinforcement is a long, high-strength member that constitutes a part of the front bumper, and is disposed on the rear side of a front bumper cover (not shown) via an absorber.

  As shown in FIG. 2, the rear end portion of the front side member 24 is coupled to the upper portion of the front surface of the toe board portion 16 of the dash panel 14 (upper portion of the vehicle exterior surface 16B) by spot welding or the like. The front end portion of the under reinforcement 26 is joined to the inside of the closed cross section at the rear end portion of the front side member 24 by spot welding or the like. The under reinforcement 26 has a kick-up portion 26A (of the skeleton body 30) that inclines from the front end portion (a portion integrated with the rear end portion of the front side member 24) to the vehicle rear lower side along the side view shape of the toe board portion 16. And a rear skeleton portion 26B (a part of the skeleton body 30) extending from the rear end portion of the kick-up portion 26A to the vehicle rear side along the lower surface 18B of the floor panel 18.

  Further, as shown in FIG. 1, the under reinforcement 26 is formed in a substantially hat-shaped cross section in which the cabin 12 side is opened as viewed from the longitudinal direction. The left and right flange portions 126 of the under-reinforce 26 are coupled to the exterior surface 16B of the toe board portion 16 on the opposite side of the toe board portion 16 in the kick-up portion 26A. In the rear skeleton portion 26B shown in FIG. 18 is coupled to the lower surface 18B.

  As shown in FIG. 1, in the under-reinforce 26, a convex portion 226 that bulges to the vehicle lower side and extends substantially in the vehicle front-rear direction is formed between the left and right flange portions 126. The convex portion 226 includes a bottom wall portion 226A disposed to face the toe board portion 16 and the floor panel 18 (see FIG. 2), and a pair of left and right side wall portions 226B that connect the bottom wall portion 226A and the left and right flange portions 126. It is configured to include. As a result, a closed cross-sectional structure including a closed cross-sectional portion 28 extending substantially in the vehicle front-rear direction is formed by the under reinforcement 26, the toe board portion 16 (dash panel 14), and the floor panel 18 (see FIG. 2). Yes. In the present embodiment, the front side member 24 and the under reinforcement 26 constitute a pair of left and right skeleton bodies 30.

  Here, in this embodiment, as shown in FIG. 2, the toe board portion 16 of the dash panel 14 is lowered so that the substantially central portion in the inclined direction slightly falls toward the bottom wall portion 226 </ b> A side of the under reinforcement 26. The cross-sectional area at the substantially central portion in the extending direction of the closed cross-sectional structure provided with the closed cross-sectional portion 28 formed by the under-reinforce 26 and the dash panel 14 is small (the closed cross-sectional height in the side cross-sectional view is small). Low). That is, the general surface of the toe board part 16 is set at a position lower in the vehicle vertical direction than the conventional structure, and the space above the toe board part 16 in the vehicle is widened accordingly.

  As shown in FIG. 1, a rocker 32 (also referred to as a side sill extending in the vehicle front-rear direction) is provided at the lower portion of the cabin 12 in the vehicle width direction outside (the lower edge side of the door opening). This is an element grasped as a “directional skeleton member”. The rocker 32 includes a rocker outer panel 32A disposed on the vehicle width direction outer side (vehicle compartment outer side) and a rocker inner panel 32B disposed on the vehicle width direction inner side (vehicle interior side). The rocker outer panel 32A is formed in a substantially hat shape in cross section with the vehicle width direction inner side opened, and the rocker inner panel 32B is formed in a cross section substantially hat shape in which the vehicle width direction outer side is opened. The rocker outer panel 32 </ b> A and the rocker inner panel 32 </ b> B are formed in a closed cross-sectional structure having a closed cross-sectional portion 34 by joining a pair of upper and lower flange portions. On the side surface of the rocker inner panel 32B on the inner side in the vehicle width direction, the terminal portion on the outer side in the vehicle width direction of the toe board portion 16 and the terminal portion on the outer side in the vehicle width direction of the floor panel 18 (see FIG. 2) are bent upward. Spot welded in the state.

  Further, a dash cross member 40 (which is an element grasped as a “vehicle width direction skeleton member” in a broad sense) is disposed on a vehicle interior surface 16A as a surface on the cabin 12 side of the toe board portion 16. . The dash cross member 40 is formed in a substantially hat shape with the toe board portion 16 side open, and upper and lower flange portions 42A and 42B (the upper flange portion is indicated by reference numeral 42A and the lower flange portion is indicated by reference numeral 42B). 16 is connected to the vehicle interior surface 16A by welding or the like and extends substantially in the vehicle width direction, and bulges 44 that bulge toward the cabin 12 between the upper and lower flange portions 42A and 42B and extend substantially in the vehicle width direction. It has. The bulging portion 44 includes a flat plate-like top wall portion 144 disposed to face the toe board portion 16, and a pair of side wall portions 244A and 244B that connect the top wall portion 144 and the upper and lower flange portions 42A and 42B. It is configured. Thereby, the closed cross-section structure provided with the closed cross-section part 48 extended in the vehicle width direction is formed by the dash cross member 40 and the toe board part 16 of the dash panel 14 (refer FIG. 2).

  Further, the flange portions on the both ends in the vehicle width direction of the dash cross member 40 are coupled to the curved wall surface of the wheel house 36, the side surface and the upper surface in the vehicle width direction of the rocker inner panel 32B by welding or the like. Further, the tunnel upper reinforcement 20 is joined to the center of the dash cross member 40 in the vehicle width direction by welding or the like. The dash cross member 40 arranged in this manner is adapted to receive a load F from the front side member 24 at the time of a frontal collision of the vehicle.

  Further, as shown in FIG. 2, when the dash cross member 40 is disposed, the space of the cabin 12 is reduced by that amount. However, in the present embodiment, as described above, the inclination direction in the toe board portion 16 is reduced. Since the substantially central portion is lowered to the bottom wall portion 226A side of the under reinforcement 26, the dash cross member 40 is disposed on the vehicle lower side as compared with the case where the substantially central portion in the inclined direction is not lowered (conventional structure) ( The amount of protrusion of the dash cross member 40 toward the cabin 12 is offset. Further, since the dash cross member 40 is disposed in a portion where the cross-sectional height of the closed cross-section portion 28 formed by the under reinforcement 26 and the toe board portion 16 (dash panel 14) is set low, the dash cross member 40 The strength and rigidity of the portion (substantially central portion in the extending direction) where the cross-sectional height of the closed cross-sectional portion 28 is set low are reinforced.

  An upper reinforcement 50 is disposed on the vehicle upper side below the kick-up portion 26A and the vehicle upper side of the rear skeleton portion 26B, and extends substantially in the vehicle front-rear direction. As shown in FIG. 1, the upper reinforcement 50 is formed in a substantially hat shape in cross section with the vehicle lower side open, and left and right flange portions 52 are shown in the vehicle interior surface 16 </ b> A below the toe board portion 16 and FIG. 2. A convex portion 54 that is coupled to the upper surface 18A of the floor panel 18 and extends substantially in the vehicle front-rear direction, and bulges toward the cabin 12 between the left and right flange portions 52 shown in FIG. I have. The convex portion 54 includes a top wall portion 154 disposed facing the lower portion of the toe board portion 16 and the floor panel 18 (see FIG. 2), and a pair of side wall portions 254 that connect the top wall portion 154 and the left and right flange portions 52. It is comprised including. As a result, the upper reinforcement 50, the lower portion of the toe board portion 16, and the floor panel 18 (see FIG. 2) form a closed cross-sectional structure including a closed cross-sectional portion 58 that extends substantially in the vehicle front-rear direction (see FIG. 2). 2, FIG. 3C (corresponding to the cross section taken along line 3C-3C in FIG. 2) and FIG. 3D (referring to the cross section taken along line 3D-3D in FIG. 2).

  As shown in FIG. 1, the upper reinforcement 50 has left and right flange portions 55 extending from the front ends of the pair of left and right side wall portions 254 so as to be separated from each other in the vehicle width direction. The left and right flange portions 55 are coupled to the lower side wall portion 244B of the dash cross member 40 by arc welding or the like. The upper reinforcement 50 has a front end flange portion 56 extending from the front end of the top wall portion 154 toward the vehicle front upper side. The front end flange portion 56 is coupled to the upper surface 44A of the top wall portion 144 of the bulging portion 44 of the dash cross member 40 by arc welding or the like.

  That is, as shown in FIG. 2, the front portion of the dash cross member 40 and the upper reinforcement 50 is disposed in the space on the cabin 12 side that is widened by setting the toe board portion 16 at a low position in the vehicle vertical direction. Both are directly connected. For this reason, the space on the cabin 12 side (vehicle interior) is secured as before, and there is no influence on the footrest position (heel point P) of the occupant 80. In FIG. 2, reference numeral 82 indicated by a two-dot chain line is a carpet arranged via a cushion material, and reference numeral 84 indicated by a two-dot chain line is a vehicle pedal.

  Here, the portion where the dash cross member 40 and the under reinforcement 26 intersect and are connected via the toe board portion 16 becomes a load input portion from the front side member 24 side at the time of a frontal collision of the vehicle. As a result, the supporting point for the input load is added.

  Further, as shown in FIG. 1, a gusset 60 is disposed substantially on the vehicle upper side of the dash cross member 40 and on the vehicle rear side of the front side member 24 in the vehicle plan view. The gusset 60 includes a main body portion 62 formed by a top wall portion 62A and a pair of left and right side wall portions 62B. The top wall portion 62 </ b> A is disposed at a position where the top wall portion 144 of the dash cross member 40 and the upper side of the toe board portion 16 are obliquely bridged. The pair of left and right side wall parts 62B is suspended from the left and right ends of the top wall part 62A toward the toe board part 16, and has a triangular shape in a side view of the vehicle.

  An upper end flange portion 64 extends from the end portion on the upper end side (toe board portion 16 side) of the top wall portion 62A toward the vehicle upper side. The upper end flange portion 64 of the gusset 60 is coupled to the vehicle interior surface 16A of the toe board portion 16 by spot welding or the like. Further, left and right flange portions 66 are extended from the ends of the pair of left and right side wall portions 62B on the dash cross member 40 side so as to be separated from each other substantially in the vehicle width direction. The left and right flange portions 66 of the gusset 60 are coupled to the upper side wall portion 244A of the dash cross member 40 by spot welding or the like. Furthermore, a lower end flange portion 68 extends from the end portion on the lower end side (dash cross member 40 side) of the top wall portion 62A toward the vehicle rear lower side. The lower end flange portion 68 of the gusset 60 is coupled to the upper surface 44 </ b> A of the top wall portion 144 in the bulging portion 44 of the dash cross member 40.

  As a result, as shown in FIG. 2, the gusset 60, the toe board portion 16, and the dash cross member 40 form a closed cross-sectional structure having a closed cross-sectional portion 70 (corresponding to the cross section taken along line 3A-3A in FIG. 2). (See FIG. 3A). Although not particularly provided in the present embodiment, in addition to the above configuration, for example, left and right so as to be separated from each other toward the vehicle width direction from the end portion on the toe board portion 16 side of the side wall portion 62B shown in FIG. While extending the flange portion, the left and right flange portions may be coupled to the toe board portion 16 and the upper flange portion 42A of the dash cross member 40 by spot welding or the like.

  With the above configuration, as shown in FIG. 2, the upper end flange portion 64, the top wall portion 62 </ b> A and the lower end flange portion 68 of the gusset 60 joined to the upper end side of the toe board portion 16, and the top wall portion of the dash cross member 40. 144 and the top wall portion 154 of the upper reinforcement 50 are continuously connected and located on the vehicle upper side of the bottom wall portion 226 </ b> A of the under reinforcement 26 via the toe board portion 16 and the floor panel 18.

  3 is a cross-sectional view taken along a direction perpendicular to the longitudinal direction of the underreinforce 26. The positional relationship between the underreinforce 26, the toe board portion 16, the dash cross member 40, the upper reinforce 50, and the gusset 60 is shown. In addition, the coupling state and the like are shown. 3A is a cross section taken along line 3A-3A in FIG. 2, FIG. 3B is a cross section taken along line 3B-3B in FIG. 2, FIG. 3C is a cross section taken along line 3C-3C in FIG. Corresponds to a cross section taken along line 3D-3D in FIG. 2 and 3, the underreinforce 26, the toe board portion 16 (dash panel 14), and the floor panel 18 (see FIG. 2) are formed on the vehicle upper side of the closed cross-sectional portion 28. A closed cross-section portion 70 and a closed cross-section portion 58 are formed before and after the closed cross-section portion 48 formed by the cross member 40 and the toe board portion 16. As a result, the structure along the under-reinforce 26 is a structure that does not have a sudden section change (a section where the section changes suddenly) as a whole.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  As shown in FIG. 1, the dash cross member 40 has upper and lower flange portions 42A and 42B coupled to the vehicle interior surface 16A of the toe board portion 16 so as to extend substantially in the vehicle width direction and between the upper and lower flange portions 42A and 42B. The bulging portion 44 bulges toward the cabin 12 and extends substantially in the vehicle width direction. When a frontal collision of the vehicle occurs, the dash cross member 40 receives the load F from the front side member 24 side as a kick-up portion 26A and It is received via the toe board unit 16.

  Here, the front end flange portion 56 of the upper reinforcement 50 is coupled to the upper surface 44A of the bulging portion 44 of the dash cross member 40, and the upper reinforcement 50 includes a vehicle upper side and a rear skeleton portion below the kick-up portion 26A. 26B (see FIG. 2) is arranged on the vehicle upper side and extends substantially in the vehicle front-rear direction, and is coupled to the vehicle interior surface 16A below the toe board portion 16 and the upper surface 18A of the floor panel 18 shown in FIG. Therefore, when the dash cross member 40 shown in FIG. 1 receives the load F through the toe board portion 16 at the time of a frontal collision of the vehicle, the upper reinforcement 50 supports a part of the load F. That is, it becomes a support point at an input position from the front side member 24.

  Further, a lower end flange portion 68 of the gusset 60 is coupled to the upper surface 44A of the bulging portion 44 of the dash cross member 40. The gusset 60 is a front side of the dash cross member 40 substantially on the vehicle upper side and in the vehicle plan view. Since the member 24 is disposed on the vehicle rear side and is coupled to the vehicle interior surface 16A of the toe board portion 16, the cross-sectional height of the under reinforcement 26 in the vicinity of the upper flange portion 42A of the dash cross member 40 as shown in FIG. Even if the size is not large, the sectional height of the gusset 60 near the upper flange portion 42A of the dash cross member 40 supplements the sectional height of the under reinforcement 26.

  For this reason, during a frontal collision of the vehicle, the bending deformation of the under reinforcement 26 near the upper flange portion 42A of the dash cross member 40 and the load applied to the dash cross member 40 due to the bending deformation are effectively prevented or suppressed. The load F from the front side member 24 side is transmitted to the dash cross member 40 and the upper reinforcement 50 more smoothly.

  To supplementally describe the above operation, for example, a contrast structure schematically shown in FIG. 4A (in the figure, substantially the same members as those of the vehicle body skeleton structure according to the present embodiment are denoted by the same reference numerals). That is, in the comparison structure in which there is no support portion on the rear side of the input position to the dash cross member 40, when there is an input from the front side member 24 to the dash cross member 40 due to a frontal collision of the vehicle (see the direction of arrow F). The dash cross member 40 generates a relatively large bending moment M with the rocker 32 and the tunnel upper reinforcement 20 as a fulcrum, and the load on the dash cross member 40 increases. In addition, the dashed-two dotted line in a figure has shown lateral bending moment distribution. On the other hand, as schematically shown in FIG. 4B, in the vehicle body skeleton structure according to the present embodiment, the gusset 60 and the upper reinforcement 50 are disposed on the rear side of the input position to the dash cross member 40. Since it functions as a support portion, the bending moment with the rocker 32 and the tunnel upper reinforcement 20 as a fulcrum is reduced. Thereby, the buckling of the portion where the dash cross member 40 and the under reinforcement 26 shown in FIG. 1 intersect and are joined via the toe board portion 16 is effectively suppressed.

  Further, in order to make it difficult for the dash cross member 40 and the under-reinforce 26 to cross and be joined via the toe board portion 16, for example, reinforcing reinforcement is provided in the under-reinforce (26). Such a comparison structure or a comparison structure in which the bulkhead is disposed in the dash cross member (40) is not a structure for reducing the bending moment itself that acts during a frontal collision of the vehicle. It is necessary to reduce weight. On the other hand, in the vehicle body skeleton structure according to the present embodiment, the bending moment itself acting at the time of a frontal collision is directly reduced, so that the weight can be reduced in comparison with the comparison structure.

  As described above, according to the vehicle body skeleton structure according to the present embodiment, it is possible to reduce the load on the dash cross member 40 at the time of a frontal collision of the vehicle.

(Supplementary explanation of the embodiment)
In the above-described embodiment, the skeleton body 30 has the front skeleton portion constituted by the front side member 24 and the kick-up portion and the rear skeleton portion constituted by the under reinforcement 26. The skeleton part may be constituted by a front side member, the kick-up part may be constituted by a front side member and underreinforce, and the skeleton part may be another skeleton body constituted by underreinforce.

  Further, in the vehicle body skeleton structure according to the above-described embodiment, the gusset 60 is disposed substantially on the vehicle upper side of the dash cross member 40 and on the vehicle rear side of the front side member 24 in the vehicle plan view. Such a structure is preferable. However, the vehicle body skeleton structure may be a vehicle body skeleton structure in which the gusset (60) is not provided, depending on the shape of the toe board portion, the dash cross member, and the like.

  Further, the shape of the flange portion for coupling (for coupling to the toe board portion or the dash cross member) in the upper reinforcement or the gusset is not limited to the example of the above embodiment shown in FIG.

1 is a perspective view showing an overall configuration of a vehicle body skeleton structure according to the present embodiment as viewed from the cabin side (the vehicle left side portion is not shown). It is a longitudinal cross-sectional view which shows the principal part structure of the vehicle body skeleton structure which concerns on this embodiment in a vehicle side view (equivalent to the expanded sectional view along the 2-2 line of FIG. 1). It is sectional drawing shown in the state which cut | disconnected the vehicle body frame structure which concerns on this embodiment along the direction orthogonal to the longitudinal direction of under reinforcement. 3A is a cross section taken along line 3A-3A in FIG. 2, FIG. 3B is a cross section taken along line 3B-3B in FIG. 2, FIG. 3C is a cross section taken along line 3C-3C in FIG. Corresponds to a cross section taken along line 3D-3D in FIG. It is explanatory drawing which shows a vehicle body frame | skeleton structure typically. FIG. 4A shows a contrast structure. FIG. 4B shows a vehicle body skeleton structure according to this embodiment.

Explanation of symbols

10 Engine room 12 Cabin 14 Dash panel 16 Toe board part 16A Car interior surface (cabin side surface)
18 Floor panel (body floor)
18A Top surface of the floor panel (top surface of the car body floor)
18B Bottom surface of floor panel (bottom surface of vehicle floor)
22 Vehicle body front 24 Front side member (front frame)
26A kick up portion 26B rear skeleton portion 30 skeleton body 40 dash cross member 42A upper flange portion 42B lower flange portion 44 bulge portion 44A upper surface of bulge portion 50 upper reinforcement 56 front end flange portion 60 gusset 68 lower end flange portion F front side member Load from the side (load from the front skeleton side)

Claims (2)

A dash panel having a toe board portion that separates the engine room and the cabin and inclines downward at the rear of the vehicle;
A front skeleton extending substantially in the vehicle front-rear direction on both sides of the front of the vehicle body and positioned on the vehicle front side of the dash panel, and a vehicle rearward along the toe board from the rear end of the front skeleton A pair of left and right skeleton bodies each including a kick-up portion inclined downward and a rear skeleton portion extending from the rear end portion of the kick-up portion to the vehicle rear side along the lower surface of the vehicle body floor;
An upper and lower flange portion is coupled to the cabin side surface of the toe board portion and extends substantially in the vehicle width direction, and bulges bulges between the upper and lower flange portions toward the cabin side and extends substantially in the vehicle width direction. A dash cross member that receives a load from the front skeleton part side at the time of a frontal collision of the vehicle,
The vehicle is disposed on the vehicle upper side below the kick-up portion and on the vehicle upper side of the rear skeleton portion and extends substantially in the vehicle front-rear direction. The cabin-side surface below the toe board portion and the upper surface of the vehicle body floor And an upper reinforcement in which a front end flange portion is coupled to an upper surface of the bulging portion of the dash cross member;
A vehicle body skeleton structure characterized by comprising:   A gusset disposed substantially on the vehicle upper side of the dash cross member and on the vehicle rear side of the front skeleton portion in a vehicle plan view and coupled to the cabin side surface of the toe board portion; and a lower end of the gusset The vehicle body skeleton structure according to claim 1, wherein a flange portion is coupled to an upper surface of the bulging portion of the dash cross member.

Images