JP2019025967A - Vehicular body structure - Google Patents

Abstract

To protect a functional component like an IPU when a side collision occurs.SOLUTION: A vehicular body structure 1 includes: a side frame 20 that extends in the back-and-forth direction of a vehicle; a first functional component 10 provided at the internal side of a vehicular widthwise direction of the side frame 20; and a cross member 30 which protrudes downwardly relative to the first functional component 10 from the side frame 20, and which extends in the vehicular widthwise direction. The cross member 30 includes: an extended part 32 that extends outwardly in the vehicular widthwise direction relative to the side frame 20; and a fragile part 33 that is provided inwardly in the vehicular widthwise direction relative to the side frame 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle body structure that supports an IPU (Intelligent Power Unit) at a lower portion of a floor.

  Patent Document 1 discloses disposing an IPU between left and right floor frames extending in the front-rear direction. The IPU is an electrical component composed of a battery module called an intelligent power unit and an electric power control unit. The IPU controls electric power supplied to the motor so as to efficiently drive the motor and engine in a hybrid vehicle or the like.

Japanese Patent No. 5997933

  As shown in FIG. 8, when the floor frame is widened around the center pillar (the rear side of FIG. 8 (a)), the protection area b between the IPU and the floor frame can be sufficiently secured. However, depending on the vehicle type, there may be a case where the protection area b cannot be sufficiently secured, for example, when the floor frame cannot be widened or when the IPU is enlarged.

  This invention is made | formed in view of the said subject, The objective is to implement | achieve the vehicle body structure which can protect functional parts, such as IPU, at the time of a side collision.

  In order to solve the above problems and achieve the object, the vehicle body structure 1 of the present invention includes a side frame 20 extending in the front-rear direction of the vehicle, and a first functional component provided on the vehicle width inward side of the side frame 20. 10 and a cross member 30 projecting from the side frame 20 below the first functional component 10 and extending in the vehicle width direction. The cross member 30 is located on the vehicle width outward side of the side frame 20. The extending part 32 extended and the weak part 33 provided in the vehicle width inner side rather than the said side frame 20 are provided, It is characterized by the above-mentioned.

  According to the present invention, it is possible to protect functional parts such as an IPU during a side collision.

It is sectional drawing which looked at the structure of the cross member periphery in the vehicle body structure of this embodiment from the vehicle body rear. It is the bottom view (a) of the vehicle body structure of this embodiment, and the enlarged view (b) of P2 part of (a). FIG. 2 is an enlarged view (a) of the lower cross member in FIG. 1 and an enlarged view (b) of a P1 portion in FIG. 1. It is a top view of the cross member simple substance in the vehicle body structure of this embodiment. FIG. 4A is a view of the right side portion of the cross member in the vehicle body structure of the present embodiment from the vehicle width center as viewed from the front of the vehicle body, FIG. 5B is a view from the rear of the vehicle body, and FIG. It is the figure (a) which looked at the reinforcement member from the vehicle body front, the figure (b) seen from the vehicle body back, and the figure (c) seen from the vehicle body lower side. FIG. 2 is an enlarged view (a) of the lower cross member of FIG. 1 and an enlarged view (b) of a P3 portion of (a). It is the bottom view (a) and sectional drawing (b) which show the conventional vehicle body structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  <Overall Configuration> First, with reference to FIG. 1, the overall configuration of the vehicle body structure of this embodiment will be schematically described.

  FIG. 1 is a cross-sectional view of the structure around the cross member in the vehicle body structure of the present embodiment as viewed from the rear of the vehicle body. Further, FIG. 1 shows only the left side from the center of the vehicle width in the AA cross section of FIG.

  As shown in FIG. 1, the vehicle body structure 1 of the present embodiment includes an IPU 10, a side frame 20, a lower cross member 30, an upper cross member 40, an outrigger 50, and a side sill 60 provided at the lower part of the floor panel.

  The IPU 10 is an electrical component composed of a battery module called an intelligent power unit (Intelligent Power Unit) and a power control unit. These components are housed in a case and integrated. The IPU has a function of controlling electric power supplied to the motor so that the motor and the engine are efficiently driven in a hybrid vehicle or the like.

  The side frame 20 extends in the longitudinal direction of the vehicle body on the left and right sides in the vehicle width direction. The side frame 20 has a closed cross section in which the shape cut in the vehicle width direction is rectangular. The IPU 10 is disposed between the pair of left and right side frames 20 at the lower part of the seat and in the center in the vehicle width direction (see FIG. 2A). In the IPU 10, both side edges 10 a in the vehicle width direction are fixed to the left and right side frames 20, and lower surface portions 10 b on both sides in the vehicle width direction are held by support members 12 attached to the upper surface portion of the lower cross member 30. Yes.

  The lower cross member 30 is connected to the left and right side frames 20 and extends in the vehicle width direction so as to protrude below the IPU 10. The upper cross member 40 is connected to the left and right side frames 20 and extends in the vehicle width direction so as to protrude above the IPU 10. The lower cross member 30 and the upper cross member 40 are arranged around the center pillar (not shown) of the vehicle body.

  The outrigger 40 is provided outside the side frame 20 in the vehicle width direction, and extends outward in the vehicle width. The outrigger 40 has a closed cross section in which the shape cut in the vehicle width direction and the vehicle body longitudinal direction is rectangular. The outrigger 40 is adjacent to the outer side surface of the side frame 20 and the extension 32 extending outward from the lower cross member 30 in the vehicle width direction.

  The side sill 60 extends in the longitudinal direction of the vehicle body on both the left and right sides in the vehicle width direction. The side sill 60 is provided outside the vehicle width of the side frame 20 with a predetermined interval. The outrigger 50 is an auxiliary frame that connects the surface of the side frame 20 outside the vehicle width and the extension 32 and the surface of the side sill 60 inside the vehicle width.

  The IPU 10 is disposed in a space between the pair of left and right side frames 20 and the lower cross member 30 below the seat. The lower cross member 30 is not widened outwardly of the vehicle width around the center pillar that intersects the side frame 20, but extends substantially linearly in the longitudinal direction of the vehicle body.

  The side impact load input from the side sill 50 on the side of the vehicle body at the time of a side collision is absorbed when the outrigger 50 is compressed and deformed, and the deformation of the outrigger 50 causes the side frame 20 to rotate about the vehicle longitudinal axis and to the inside of the vehicle width. Is deformed so as to be displaced downward. In the present embodiment, the IPU 10 as the first functional component is disposed on the floor panel 2 below the seat without increasing the distance between the pair of left and right side frames 20, and is protected from a side impact load.

  <IPU Support Structure> Next, the details of the vehicle body structure 1 for supporting the IPU 10 in the lower part of the floor according to this embodiment will be described with reference to FIGS. 2 to 7 in addition to FIG.

  FIG. 2 is a bottom view (a) of the vehicle body structure of the present embodiment and an enlarged view (b) of the P2 portion of (a). FIG. 3 is an enlarged view (a) of the lower cross member of FIG. 1 and an enlarged view (b) of the P1 portion of FIG. FIG. 4 is a top view of a single cross member in the vehicle body structure of the present embodiment. 5A is a view of the right side portion of the cross member in the vehicle body structure of the present embodiment from the center of the vehicle width as viewed from the front of the vehicle body, FIG. 5B is a view from the rear of the vehicle body, and FIG. It is. 6A is a view of the reinforcing member as viewed from the front of the vehicle body, FIG. 6B is a view as viewed from the rear of the vehicle body, and FIG. 7 is an enlarged view (a) of the lower cross member of FIG. 1 and an enlarged view (b) of the P3 portion of (a).

  As shown in FIGS. 1 to 5, the lower cross member 30 includes a first member 30 </ b> A, a second member 30 </ b> B, and a reinforcing member 30 </ b> C, each of which is composed of separate members. The first member 30A is provided at the center in the vehicle width direction, and the second member 30B extends outward from the left and right vehicle widths from both ends of the first member 30A in the vehicle width direction. The reinforcing member 30C is provided across the first member 30A and the second member 30B.

  The first member 30 </ b> A includes a central portion 31 that extends horizontally along the lower surface portion 10 b of the IPU 10. In addition, the center part 31 should just be a shape along the lower surface part 10b of IPU10, and does not need to be a horizontal shape.

  The second member 30 </ b> B includes an extension portion 32 that extends outward in the vehicle width from the side frame 20, and an inclined portion 34 that is provided inward of the vehicle width from the side frame 20. The reinforcing member 30C reinforces the inclined portion 34. The extension 32 extends from the side sill 60 toward the side frame 20. The inclined portion 34 is inclined downward from the side frame 20 toward the IPU 10. The inclined portion 34 inclines downward and extends horizontally inward of the vehicle width and is connected to the central portion 31 of the first member 30A, and a fragile portion 33 is formed at a connection portion between the central portion 31 and the inclined portion 34. The Specifically, the fragile portion 33 includes an end portion on the vehicle width outward side in the central portion 31 of the first member 30A, and a vehicle width inward side extending horizontally from the inclined portion 34 of the second member 30B to the central portion 31. It is formed at the connecting portion between the end portion, the vehicle width outward end portion of the central portion 31 and the vehicle width inward end portion of the inclined portion 34 in the reinforcing member 30C.

  The extension 32 receives a load before the side frame 20 at the time of a side collision. The fragile portion 33 is deformed by a side impact load received by the extension portion 32. As described above, the lower cross member 30 is bent and absorbs the side collision load, whereby the side frame 20 can be prevented from being displaced in the vehicle width direction. Specifically, as shown by the imaginary line 20 ′ in FIG. 1, the side frame 20 is not displaced inward in the vehicle width even when subjected to a side impact load, and is around the axis of the side frame 20 in the longitudinal direction of the vehicle body. Rotate in the direction. Thereby, it can avoid that the side frame 20 collides with IPU10.

  Further, at the time of a side collision, the inclined portion 34 of the second member 30B bends the central portion 31 of the first member 30A and deforms the central portion 31 so as to push it downward. Thereby, since the center part 31 of the 2nd member 30B deform | transforms in the direction away from the lower surface part 10b of IPU10, a contact with IPU10 can be avoided and protected. In addition, since the inclined portion 34 of the second member 30B deforms the central portion 31 of the first member 30A more greatly, a large side impact load can be absorbed.

  As shown in FIG. 2B, the central portion 31 of the first member 30A is joined to the lower surface portion 10b of the IPU 10 in the vertical direction by spot welding or the like. A plurality of locations 35 on the side edge of the central portion 31 of the first member 30 </ b> A are joined to the lower surface portion 10 b of the IPU 10. The inclined portion 34 of the second member 30B pushes down the central portion 31 of the first member 30A downward at the time of a side collision. At this time, the welded portion between the central portion 31 of the first member 30A and the lower surface portion 10b of the IPU 10 Side impact load can be absorbed by peeling 35. Since the lower cross member 30 has higher strength than the floor panel 2, it can be easily peeled off.

  As shown in FIG. 3B, the lower cross member 30 is configured by connecting a first member 30A and a second member 30B, which are separate members. An end 34a on the vehicle width inward side of the second member 30B is inserted into an end 31a on the vehicle width outward side of the central portion 31 of the first member 30A, and overlaps at the fragile portion 33 of the reinforcing member 30C. Be joined. The end 34a on the vehicle width inward side of the second member 30B is inserted above the end 31a on the vehicle width outward side of the central portion 31 of the first member 30A, and there are a plurality of side edges of both members. It joins by spot welding etc. in the location 36 (refer FIG.2 (b)). Thereby, the end 34a on the vehicle width inward side of the second member 30B surely pushes down the central portion 31 of the first member 30A during a side collision. When the vertical relationship between the end 34a on the vehicle width inward side of the second member 30B and the end 31a on the vehicle width outward side of the central portion 31 of the first member 30A is opposite, the second member The end portion 34a on the vehicle width inner side of 30B is separated from the end portion 31a on the vehicle width outer side of the central portion 31 of the first member 30A, and the central portion 31 of the first member 30A is pushed down. Can not.

  Further, a joint portion between the end 34a on the vehicle width inward side of the second member 30B where the weakened portion 33 is formed and the end 31a on the vehicle width outward side of the central portion 31 of the first member 30A is predetermined. By connecting the first member 30 </ b> A and the second member 30 </ b> B with each other by spot welding, the weakened portion 33 formed at the joint portion between the first member 30 </ b> A and the second member 30 </ b> B becomes weaker than the other portions of the lower cross member 30. The joining means is not limited to spot welding, but may be intermittent MIG welding or non-joining.

  As shown in FIG. 3, the reinforcing member 30C extends from the inclined portion 34 of the second member 30B along the central portion 31 of the first member 30A in a dogleg shape. As shown in FIG. 6, the reinforcing member 30 </ b> C includes a bottom surface portion 37 that bends in a dogleg shape along the shape of the central portion 31 of the first member 30 </ b> A from the inclined portion 34 of the second member 30 </ b> B, It has a front wall portion 38 that rises upward on the front side of the vehicle body and a rear wall portion 39 that stands upward on the vehicle body rear side of the bottom surface portion 37. A concave fragile portion 33 is formed on the bottom surface portion 37. The front wall portion 38 is formed lower than the rear wall portion 39, and the rear wall portion 39 is formed lower than the height of the inclined portion 34 of the second member 30B.

  The reinforcing member 30C reinforces the corner portion 34b where the inclined portion 34 of the second member 30B is bent horizontally toward the central portion 31 of the first member 30A. By reinforcing the corner portion 34b of the inclined portion 34 on the outer side of the fragile portion 33 with the reinforcing member 30C, the second member 30B of the lower cross member 30 is wider than the fragile portion 33 with respect to the vehicle width. It is possible to prevent the outer corner portion 34b from being bent and to be surely bent in the vicinity of the fragile portion 33. In other words, it is possible to prevent the central portion 31 of the first member 30A from being pushed up by bending the corner portion 34b.

  Further, the reinforcing member 30C extends to the inner side of the central portion 31 of the first member 30A on the inward side of the vehicle width from the fragile portion 33 in the inclined portion 34. Accordingly, the second member 30B can be reliably bent downward near the fragile portion 33, and the central portion 31 of the first member 30A can be pushed down directly by the reinforcing member 30C.

  As shown in FIG. 1, the upper cross member 40 is attached to the vehicle width outward side of the upper surface portion 20 a of the left and right side frames 20. Accordingly, it is possible to prevent the side frame 20 from being displaced inward in the vehicle width while allowing the rotation R1 of the side frame 20 around the vehicle longitudinal axis in the vehicle width outward direction. Further, since the side collision load can be distributed to the upper cross member 40, the IPU 10 can be protected against a large side collision load.

  The extension 32 of the second member 30B of the lower cross member 30 forms a closed section 32a with the lower surface 50a of the outrigger 50, and the closed section 32a is cut off toward the side sill 60 outside the vehicle width. The area (width in the vertical direction) is formed to be small. Further, the extension portion 32 and the outrigger 50 are disposed within the range of the width dimension of the side sill 60 in the vertical direction.

  The extension part 32 of the second member 30B can transmit the load directly to the fragile part 32 side while collapsing in the axial direction (vehicle width direction) together with the outrigger 50 and absorbing the load at the time of a side collision. Since the closed cross section on the side sill 60 side (the vehicle width outward side) in the closed cross section 32a is small, it becomes a structure in which the axial crushing of the outrigger 50 and the extension part 32 of the second member 30B is difficult to be inhibited.

  Further, as shown in FIG. 5A, when the cross member 30 is viewed from the vehicle width direction, the cross-sectional area D1 in the vicinity of the fragile portion 33 of the reinforcing member 30C is outside the vehicle width from the fragile portion 33. The cross-sectional area D2 of the portion on the vehicle width inward side of the inclined portion 34 of the second member 30B and the cross-sectional area D3 of the central portion 31 of the first member 30A on the vehicle width inward side of the fragile portion 33 are smaller. By making the cross-sectional area near the fragile portion 32 of the reinforcing member 30C smaller than other portions of the lower cross member 30, the lower cross member 30 can be bent downward more reliably at the fragile portion 32 of the reinforcing member 30C.

  As shown in FIG. 7, the extension part 32 of the second member 30B in the lower cross member 30 includes a horizontal part 32b extending horizontally from the inclined part 34 toward the vehicle width outward side. The fuel pipe 70 is disposed in a range below the horizontal portion 32b and above the line 34c at the lower end portion (corner portion 34b) of the inclined portion 34. The fuel pipe 70 extends from the fuel tank 11 (see FIG. 2) disposed adjacent to the rear side of the vehicle body of the IPU 10 to the front side of the vehicle body. Thereby, the fuel piping 70 which is a 2nd functional component can be accommodated and hold | maintained using the space between the horizontal part 32b and the inclination part 34. FIG.

  The fuel pipe 70 is attached to the horizontal portion 32b by support means such as a clip 71. The clip 71 is attached to fixing means such as a stat bolt 72 extending downward from the horizontal portion 32b. The clip 71 is attached to the horizontal portion 32b by being inserted into the stat bolt 72 from below to above.

  At the time of a side collision, the upper end 34d of the inclined portion 34 of the second member 30B and the horizontal portion 32b continuous therewith are displaced downward S1 to interfere with the fuel pipe 70, and the clip 71 is lowered from the stat bolt 72 by the lever principle. The fuel pipe 70 falls off to the lower side of the horizontal portion 32b after dropping into S2. Thereby, it is possible to prevent the fuel pipe 70 from being sandwiched between the side sill 60 and the inclined portion 34.

[Summary of Embodiment]
<First aspect>
A side frame 20 extending in the longitudinal direction of the vehicle;
A first functional component 10 provided on the vehicle width inner side of the side frame 20;
A cross member 30 protruding from the side frame 20 below the first functional component 10 and extending in the vehicle width direction,
The cross member 30 includes an extension 32 extending outward in the vehicle width direction from the side frame 20, and
It is provided with the weak part 33 provided in the vehicle width inner side rather than the said side frame 20. It is characterized by the above-mentioned.

  According to the first aspect, the extension portion 32 receives a load before the side frame 20 at the time of a side collision. The fragile portion 33 is deformed by a side impact load received by the extension portion 32. As described above, the cross member 30 is bent to absorb the side collision load, whereby the side frame 20 can be prevented from being displaced in the vehicle width direction. Specifically, the side frame 20 does not move inward of the vehicle width even when subjected to a side collision load, but rotates about the axis of the side frame 20 in the longitudinal direction of the vehicle body. Thereby, it can avoid that the side frame 20 collides with the 1st functional component 10. FIG.

<Second aspect>
In the first aspect, the cross member 30 extends along the inclined portion 34 inclined downward from the side frame 20 toward the first functional component 10 and the lower surface portion 10 b of the first functional component 10. A central portion 31 extending in the vehicle width direction,
The weak part 33 is formed in the central part 31.

  According to the 2nd aspect, the inclined part 34 bends the center part 31 at the time of a side collision, and it deform | transforms it in the direction which pushes down the center part 31 below. Thereby, since the center part 31 deform | transforms in the direction spaced apart from the lower surface part 10b of the 1st functional component 10, a contact with the 1st functional component 10 can be avoided and protected. Moreover, since the inclined portion 34 deforms the central portion 31 more greatly, a large side collision load can be absorbed.

<Third Aspect>
In the second aspect, the center portion 31 is joined to the lower surface portion 10b of the first functional component 10 in the vertical direction.

  According to the third aspect, the inclined portion 34 pushes down the central portion 31 downward at the time of a side collision, but at that time, the welded portion 35 between the central portion 31 and the lower surface portion 10b of the first functional component 0 is peeled off. This can absorb the side impact load.

<Fourth aspect>
In the second or third aspect, the inclined portion 34 and the central portion 31 are configured as separate parts,
The fragile portion 33 is formed at a joint portion between the inclined portion 34 and the central portion 31,
An end portion 34a on the vehicle width inward side of the inclined portion 34 is inserted into an upper side of an end portion 31a on the vehicle width outward side of the central portion 31.

  According to the fourth aspect, the end 34a on the vehicle width inward side of the cross member 30 reliably pushes down the central portion 31 of the cross member 30 during a side collision.

<Fifth aspect>
In any one of the first to fourth aspects, a corner portion 34b extending from the inclined portion 34 to the vehicle width inward side along the central portion 31 is provided between the inclined portion 34 and the central portion 31. A reinforcing member 30C for reinforcement is provided.

  According to the fifth aspect, by reinforcing the corner portion 34b on the vehicle width outward side with respect to the fragile portion 33 with the reinforcing member 30C, the cross member 30 is on the vehicle width outward side with respect to the fragile portion 33 due to a side collision load. It is possible to prevent the corner portion 34b from being bent and to reliably bend the weak portion 33. In other words, it is possible to prevent the center portion 31 of the cross member 30 from being pushed up by bending the corner portion 34b.

<Sixth aspect>
In the fifth aspect, the reinforcing member 30C extends inwardly of the vehicle width from the fragile portion 33.

  According to the sixth aspect, the cross member 30 can be reliably bent downward at the fragile portion 33, and the central portion 31 of the cross member 30 can be pushed down directly by the reinforcing member 30C.

<Seventh aspect>
In any one of the first to sixth aspects, an upper cross member 40 protruding from the side frame 20 above the first functional component 10 and extending in the vehicle width direction is provided.
The upper cross member 40 is attached to the vehicle width outward side of the upper surface portion 20 a of the side frame 20.

  According to the seventh aspect, it is possible to prevent the side frame 20 from being displaced inward in the vehicle width while allowing the rotation R1 of the side frame 20 around the vehicle longitudinal direction axis to the vehicle width outward side. Further, since the side collision load can be distributed to the upper cross member 40, the first functional component 10 can be protected against a large side collision load.

<Eighth aspect>
In any one of the first to seventh aspects, the side sill 60 provided on the vehicle width outer side of the side frame 20;
An outrigger 50 provided between the side sill 60 and the side frame 20,
The extension portion 32 forms a closed section 32a with the lower surface portion 50a of the outrigger 50,
The closed cross section 32a is formed so that the cross-sectional area becomes smaller toward the outer side of the vehicle body.

  According to the 8th aspect, the extension part 32 can transmit a load directly to the weak part 32 side, crushing to an axial direction (vehicle width direction) and absorbing a load with the outrigger 50 at the time of a side collision. Since the closed cross section on the side sill 60 side (the vehicle width outward side) of the closed cross section 32a is small, the structure is such that the axial crushing of the outrigger 50 and the extension portion 32 is difficult to be inhibited.

<Ninth aspect>
In any one of the first to eighth aspects, the cross-sectional area D1 of the portion of the cross member 30 where the fragile portion 33 is provided is on the vehicle width inward side of the extension portion 32 and is closer to the vehicle than the fragile portion 33. It is characterized by being smaller than the cross-sectional area D2 of the portion on the outer side of the width and the cross-sectional area D3 of the portion on the inner side of the vehicle width from the fragile portion 33.

  According to the ninth aspect, by making the cross-sectional area in the vicinity of the fragile portion 32 smaller than other portions in the cross member 30, the cross member 30 can be more reliably bent downward by the fragile portion 32.

<Tenth aspect>
In any one of the first to ninth aspects, the cross member 30 includes a horizontal portion 32b extending horizontally from the inclined portion 34 toward the vehicle width outward side,
A second functional component 70 is disposed below the horizontal portion 32b and above the lower end portion 34c of the inclined portion 34.

  According to the 10th aspect, the 2nd functional component 70 can be accommodated and hold | maintained using the space between the horizontal part 32b and the inclination part 34. FIG.

<Eleventh aspect>
In the tenth aspect, the second functional component 70 is attached to the horizontal portion 32b by insertion from below to above.

  According to the eleventh aspect, the inclined portion 34 and the horizontal portion 32b continuing to the inclined portion 34 are displaced downward S1 at the time of a side collision, thereby interfering with the second functional component 70 and causing the second functional component 70 to move to the horizontal portion 32b. Let go down. Thereby, it is possible to prevent the second functional component 70 from being sandwiched between the side sill 60 and the inclined portion 34.

1 ... body structure 10 ... IPU (first functional component)
10a ... side edge 10a
10b ... lower surface 11 ... fuel tank 12 ... support member 20 ... side frame 20 '... side frame (after rotation due to side impact load)
20a ... Upper surface part 30 ... Lower cross member 30A ... First member 30B ... Second member 30C ... Reinforcing member 31 ... Center part 31a ... End 32 on the vehicle width outward side ... Extension part 32a ... Closed section 32b ... Horizontal Part 33 ... Fragile part 34 ... Inclined part 34a ... End 34b on the inner side of the vehicle width ... Corner part 34c ... Line 34d on the lower end part ... Upper end part 35, 36 ... Welded point 37 of the IPU and cross member ... Bottom face part 38 ... Front wall portion 39 ... Rear wall portion 40 ... Upper cross member 50 ... Outrigger 50a ... Lower surface portion 60 ... Side sill 70 ... Fuel piping (second functional component)
71 ... Clip 72 ... Stud bolt D1 ... Cross-sectional area D2 of the fragile part ... Cross-sectional area D3 of the portion on the inner side of the vehicle width of the inclined part ... Cross-sectional area R1 of the central part ... Displacement direction S2 of the horizontal portion 32b and the inclined portion 34 due to the side impact load...

Claims (11)

A side frame extending in the longitudinal direction of the vehicle;
A first functional component provided on the vehicle width inner side of the side frame;
A cross member protruding from the side frame below the first functional component and extending in the vehicle width direction,
The cross member includes an extension extending outward in the vehicle width from the side frame,
A vehicle body structure comprising: a fragile portion provided on the inner side of the vehicle width from the side frame. The cross member includes an inclined portion that is inclined downward from the side frame toward the first functional component, and a central portion that extends in a vehicle width direction along a lower surface portion of the first functional component,
The vehicle body structure according to claim 1, wherein the fragile portion is formed in the central portion.   The vehicle body structure according to claim 2, wherein the central portion is joined in a vertical direction to a lower surface portion of the first functional component. The inclined part and the central part are composed of separate parts,
The fragile portion is formed at a joint portion between the inclined portion and the central portion,
4. The vehicle body structure according to claim 2, wherein an end portion on the vehicle width inward side of the inclined portion is inserted above an end portion on the vehicle width outward side of the central portion.   5. A reinforcing member that extends from the inclined portion toward the vehicle width inward side along the central portion and reinforces a corner portion between the inclined portion and the central portion is provided. The vehicle body structure according to any one of the above.   The vehicle body structure according to claim 5, wherein the reinforcing member extends inwardly of the vehicle width from the fragile portion. An upper cross member that protrudes upward from the side frame above the first functional component and extends in the vehicle width direction;
The vehicle body structure according to any one of claims 1 to 6, wherein the upper cross member is attached to a vehicle width outward side of an upper surface portion of the side frame. A side sill provided on the lateral width side of the side frame;
An outrigger provided between the side sill and the side frame,
The extension portion forms a closed cross section with the lower surface portion of the outrigger,
The vehicle body structure according to any one of claims 1 to 7, wherein the closed cross-section is formed so that a cross-sectional area decreases toward an outer side of the vehicle body.   The cross-sectional area of the cross member where the fragile portion is provided is the cross-sectional area of the portion on the vehicle width inner side from the extension portion and the vehicle width outward side of the fragile portion, and the cross-sectional area of the cross member within the vehicle width from the fragile portion The vehicle body structure according to any one of claims 1 to 8, wherein the vehicle body structure is smaller than a cross-sectional area of a side portion. The cross member includes a horizontal portion that extends horizontally from the inclined portion toward the outer side of the vehicle width,
The vehicle body structure according to any one of claims 2 to 6, wherein a second functional component is disposed below the horizontal portion and above a lower end portion of the inclined portion.   The vehicle body structure according to claim 10, wherein the second functional component is attached to the horizontal portion by insertion from below to above.

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