JP2018203029A - Vehicle body lower part structure - Google Patents

Abstract

To provide a vehicle body lower part structure that can protect an underfloor mounted component from an impact load inputted from a lateral side of a vehicle in a state in which a lower surface of a battery pack is arranged below a side sill.SOLUTION: A vehicle body lower part structure 12 comprises a left side sill 14, a battery pack 20, and a left frame 161. The left side sill includes an inner corner portion 64 and a side sill flange 66. A case bottom 108 of the battery pack is placed below the left side sill, and the battery pack includes a battery cross member 104. The left frame includes a frame engagement portion 208 and a second frame inclined portion 183. The engagement portion is arranged opposite to the inner corner portion. The inclined portion extends in an inclined manner upward from the case bottom toward a lower end 66a of the side sill flange.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle body lower structure.

As a lower body structure, for example, an energy absorbing member is provided inside a side sill, a battery pack is provided below a floor panel, and a battery cross member is provided inside the battery pack. A battery is accommodated in the battery pack.
According to the vehicle body lower structure, the impact load input from the side of the vehicle can be absorbed by the energy absorbing member, and the remaining load can be supported by the battery cross member. Thereby, a battery pack (namely, battery) can be protected from the impact load input from the side of a vehicle.

By the way, the sedan (sedan) of the vehicle types of the vehicle has a lower end portion of the side sill arranged at a height substantially equal to the minimum ground height. For this reason, the lower surface (that is, the bottom portion) of the battery pack is disposed at substantially the same height as the lower end portion of the side sill.
By disposing the lower surface of the battery pack at substantially the same height as the lower end of the side sill, the battery pack can be hidden from view from the outside of the vehicle.

  In addition, since the lower surface of the battery pack is arranged at substantially the same height as the lower end of the side sill, the impact load input from the side of the vehicle is absorbed by the energy absorbing member inside the side sill, and then the remaining Can be supported by the battery cross member. Thereby, a battery pack (namely, battery) can be protected from the impact load input from the side of a vehicle (for example, refer to patent documents 1).

U.S. Pat. No. 8,702,161

  By the way, SUV (Sport utility vehicle) is known as a vehicle type. The SUV is provided at a position where the side sill is higher than a sedan vehicle. Therefore, when the battery pack is mounted on the SUV, the lower surface of the battery pack can be disposed below the side sill. By disposing the lower surface of the battery pack below the side sill, the battery pack can be made large.

  However, when the lower surface of the battery pack is disposed below the side sill, the lower portion of the battery cross member is provided below the side sill. Therefore, it becomes difficult to transmit the impact load input from the side of the vehicle to the lower part of the battery cross member. For this reason, it is difficult to support the impact load at the lower part of the battery cross member, and a device for protecting the battery pack (that is, the underfloor mounted component) from the impact load is required.

  Therefore, the present invention provides a vehicle body lower structure that can protect an underfloor component from an impact load input from the side of the vehicle in a state where the lower surface of the battery pack is disposed below the side sill.

  In order to solve the above-described problem, the lower body structure of the invention described in claim 1 is provided outside the vehicle (for example, the vehicle Ve in the embodiment), and the inner corner portion (for example, implementation) at the inner lower portion in the vehicle width direction. The inner sill 64, 318) is formed, and the side sill flange (for example, the side sill flange 66, 315 of the embodiment) extends downward from the outside in the vehicle width direction of the inner corner (for example, the left side sill 14, of the embodiment). 302, right side sill 15), a floor panel attached to the side sill (for example, the floor panel 16 of the embodiment), and a lower surface (for example, the case of the embodiment) provided below the floor panel. An underfloor mounting component (for example, the battery pack 20 of the embodiment) in which the bottom portion 108) is disposed, and an outer surface of the underfloor mounting component. A frame portion (for example, the left and right frame portions 161, 162 and the front frame portion 163 of the embodiment) opposed to the inner corner portion, and the underfloor mounted component is an underfloor cross member (for example, And the battery cross member 104, 104A, 104B) of the embodiment, and the frame portion includes an engaging portion (for example, the frame engaging portion 208, 338 of the embodiment) facing the inner corner portion, and the side sill flange. The lower end portions of the side sill flanges (for example, the lower end portions 66a and 315a of the side sill flanges of the embodiment) from the lower surface side of the underfloor mounting component such that virtual extension lines (for example, the virtual extension lines 186 and 336 of the embodiment) intersect. ) And an inclined portion (for example, the second frame inclined portions 183 and 333 of the embodiment) extending in an upward inclined direction. That, characterized in that.

  Thus, the side sill flange of the side sill was extended downward from the outside in the vehicle width direction of the inner corner portion. In addition, the inclined portion of the frame portion is extended upwardly from the lower surface side of the underfloor mounted component toward the lower end portion of the side sill flange, and the virtual extension line of the inclined portion intersects the side sill flange. Therefore, it is possible to hide the inclined portion with the side sill flange so that it is difficult to see the inclined portion from the outside of the vehicle. As a result, the large underfloor mounted component in which the lower surface of the underfloor mounted component is disposed below the side sill can be mounted on the vehicle without affecting the appearance of the vehicle.

Further, by forming the inclined portion in the frame portion, a part of the impact load input to the side sill from the side of the vehicle can be transmitted as a so-called offset load to the lower portion of the underfloor cross member via the frame portion.
Furthermore, the upper part of the underfloor cross member faces the side sill. That is, a part of the impact load input to the side sill from the side of the vehicle can be transmitted to the upper part of the underfloor cross member.
Therefore, the impact load inputted to the side sill from the side of the vehicle can be distributed and transmitted to the upper part and the lower part of the underfloor cross member. Thereby, an impact load can be supported by the underfloor cross member. As a result, it is possible to protect a large underfloor mounted component having the lower surface of the underfloor mounted component disposed below the side sill from an impact load.

  According to a second aspect of the present invention, the frame portion is provided on an outer peripheral wall (for example, the case wall portion 107 of the embodiment) of the underfloor mounted component, and is formed in an L shape by the engagement portion and the inclined portion. It is formed in a closed cross section.

  Here, the engaging portion faces the inner corner portion. Further, the frame portion is formed in an L-shaped closed section by the engaging portion and the inclined portion. Therefore, the engaging part is firmly formed in the frame part. That is, the inner corner portion (that is, the side sill) can be reliably received by the frame portion where the engaging portion is formed. Thereby, the impact load input to the side sill can be reliably transmitted to the underfloor cross member through the frame portion. As a result, the transmitted impact load can be supported by the underfloor cross member.

  According to a third aspect of the present invention, the side sill is joined to the side sill outer on the outer side in the vehicle width direction (for example, the side sill outer 41 of the embodiment) and the side sill outer from the inner side in the vehicle width direction, and is closed together with the side sill outer. A side sill inner (for example, the side sill inner 42 of the embodiment) forming a cross section, and a first energy absorbing member (for example, the first energy absorbing member 44 of the embodiment, which is disposed on the closed cross section and attached to the side sill outer) 316).

Thus, the 1st energy absorption member was attached to the side sill outer. Therefore, the degree of freedom of the shape of the side sill inner can be increased, and the inner corner portion can be easily formed in the side sill inner. By forming the inner corner portion in a right-angled shape, the inner corner portion can be satisfactorily engaged with the engaging portion when an impact load is input from the side of the vehicle.
Thereby, a part of the impact load inputted to the side sill from the side of the vehicle can be reliably transmitted as a so-called offset load to the lower part of the underfloor cross member via the frame portion.

  According to a fourth aspect of the present invention, the frame portion includes a second energy absorbing member (for example, an implementation) disposed inside (for example, the interior 178 of the first frame portion or the interior 187 of the second frame portion). The first frame energy absorbing members 167 and 323 and the second frame energy absorbing members 168 and 324) are provided.

Thus, the 2nd energy absorption member was provided in the inside of a frame part. Therefore, the second energy absorbing member can be crushed by the impact load input from the side of the vehicle. When the second energy absorbing member is crushed by the impact load, the inner corner portion of the side sill can be favorably engaged with the frame portion.
As a result, a part of the impact load input to the side sill from the side of the vehicle can be more reliably transmitted as a so-called offset load to the lower part of the underfloor cross member via the frame portion.

  In the invention described in claim 5, the underfloor cross member has an upper portion (for example, the cross member upper portion 104a of the embodiment) facing a center portion (for example, the side sill center portion 14a of the embodiment) in the vertical direction of the side sill. It is arranged as follows.

Thus, the upper part of the underfloor cross member faces the central part of the side sill. Thereby, a part of the impact load inputted to the side sill from the side of the vehicle can be transmitted to the upper part of the underfloor cross member as a so-called horizontal load.
Therefore, the impact load inputted to the side sill from the side of the vehicle can be distributed and transmitted to the upper part and the lower part of the underfloor cross member. Thereby, an impact load can be supported by the underfloor cross member.

  The invention described in claim 6 is characterized in that the underfloor cross member includes a fragile portion (for example, the fragile portion 124 of the embodiment) formed in an outer region on the outer side in the vehicle width direction (for example, the outer region E1 of the embodiment), And a strong portion (for example, the strong portion 125 of the embodiment) formed in the inner region (for example, the inner region E2 of the embodiment) on the inner side in the vehicle width direction.

Thus, the weak part was formed in the outer region of the underfloor cross member. Therefore, the impact load input from the side of the vehicle can be absorbed by crushing the fragile portion.
On the other hand, a strong portion was formed in the inner region of the underfloor cross member. Therefore, the load after being absorbed by the fragile portion can be supported by the strong portion.
Thereby, a floor panel can be divided into the energy absorption area | region of the vehicle width direction outer side, and the protection area | region inside a vehicle width direction.

  According to a seventh aspect of the present invention, the underfloor cross member is formed in a hollow shape and is provided at the center in the vertical direction to partition the underfloor cross member up and down (for example, the battery cross member partition wall 122 of the embodiment). ).

In this way, the hollow underfloor cross member is vertically partitioned by the partition walls. The underfloor cross member can be divided into an upper cross member and a lower cross member by a partition wall.
Therefore, a part of the impact load input to the side sill from the side of the vehicle can be transmitted to the upper part of the cross member as a so-called horizontal load. Further, a part of the impact load input to the side sill from the side of the vehicle can be transmitted to the lower part of the cross member as a so-called offset load.
In this way, a part of the impact load input to the side sill from the side of the vehicle can be divided and transmitted to the two paths of the cross member upper part and the cross member lower part. As a result, part of the impact load can be favorably supported by the upper cross member and the lower cross member.

  According to an eighth aspect of the present invention, the first floor cross member extends in the vehicle width direction along the upper surface of the floor panel (for example, the upper surface 16a of the floor panel of the embodiment) and is spaced in the longitudinal direction of the vehicle body. (For example, the first floor cross member 31, 31A, 31B of the embodiment) and a second floor cross member (for example, the second floor cross member 32 of the embodiment), the first floor cross member and the second floor The cross member includes a top portion (for example, the first and second member top portions 81 and 91 in the embodiment), a pair of wall portions (for example, the front and rear wall portions 82 and 83 and the second member in the embodiment). Front and rear walls 92, 93), front flange (eg, first member front flange 84, second member front flange 94 of the embodiment) and rear flange (eg, first member of the embodiment). The rear flange 85 and the second member rear flange 95) are formed in a hat shape in cross section, and the front flange and the rear flange are joined to the upper surface of the floor panel, and are connected to the first floor cross member and the second floor cross member. A seat (for example, the driver seat 24 and the passenger seat 26 of the embodiment) is supported, and the first floor cross member is a wall portion (for example, a rear wall of the first member of the embodiment) facing the second floor cross member. Part 83) has a first recess recessed upward (for example, the first recess 88 of the embodiment), and the second floor cross member is a wall portion facing the first floor cross member (for example, implementation) The second member front wall portion 92) of the form has a second recessed portion (for example, the second recessed portion 97 of the embodiment) recessed upward, and the floor panel is 1 recess and ridge second and along a recess raised upward (e.g., ridges 38 of the embodiment) having, characterized in that.

Thus, the seat is supported by the first floor cross member and the second floor cross member. That is, the first floor cross member and the second floor cross member are reinforced with the seat. Therefore, the first recess and the second recess can be formed in a state where the strength of the first floor cross member and the second floor cross member is secured.
Furthermore, the raised portion of the floor panel was raised upward along the first recess and the second recess. Therefore, a large space below the floor panel can be secured, and the capacity of the underfloor mounted components disposed below the floor panel can be increased.
Here, the raised portion of the floor panel is formed between the first floor cross member and the second floor cross member. Therefore, the raised portion is located below the sheet. For example, the raised portion is disposed on the rear side of the vehicle body from the foot of the occupant seated on the seat (around the place where the foot of the occupant is placed). Thereby, when the passenger | crew who seated on the seat puts a leg, it can prevent that a protruding part becomes obstructive.

  The invention described in claim 9 is characterized in that the underfloor cross member is connected to the floor panel below the first floor cross member and the second floor cross member.

Thus, the underfloor cross member is connected to the floor panel below the first floor cross member via the connecting member. Therefore, the floor panel below the first floor cross member is reinforced by the under floor cross member.
The underfloor cross member is coupled to the floor panel below the second floor cross member. Therefore, the floor panel below the second floor cross member is reinforced by the under floor cross member.
Therefore, the rigidity of the floor panel below the first floor cross member is increased, and the rigidity of the floor panel below the second floor cross member is increased. Thereby, even if a floor cross member and a floor cross member have a weak part partially, the proof stress with respect to the impact load input from the side of a vehicle can be improved.

  According to a tenth aspect of the present invention, the underfloor cross member has a recess (for example, the battery cross member recess 148 of the embodiment) in which a downward recess is formed in the center in the vehicle width direction. A tube housing portion (for example, the tube housing portion 106 according to the embodiment) that is attached so as to extend in the front-rear direction and accommodates at least one of the piping (for example, the piping 154 according to the embodiment) and the hose (for example, the hose 155 according to the embodiment). It is characterized by comprising.

In this way, by forming a recess in the underfloor cross member, the recess can be provided with a tube accommodating portion. Pipes, hoses and the like are accommodated in the tube accommodating portion.
Moreover, the recessed part is reinforced with the pipe | tube accommodating part by providing a pipe | tube accommodating part in the recessed part of an underfloor cross member. Therefore, when a load is transmitted from the side of the vehicle to the underfloor cross member, the transmitted load can be supported by the pipe housing portion. Thereby, it can prevent that a recessed part breaks with the transmitted load, and the transmitted load can be supported by the underfloor cross member.

According to this invention, the inclined part is formed in the frame part. Therefore, a part of the impact load inputted to the side sill from the side of the vehicle can be transmitted as a so-called offset load to the lower part of the underfloor cross member through the frame portion. Moreover, the upper part of the underfloor cross member was made to oppose the side sill. Therefore, a part of the impact load input to the side sill from the side of the vehicle can be transmitted to the upper part of the underfloor cross member.
Thereby, in the state where the lower surface of the battery pack is disposed below the side sill, the underfloor component can be protected from the impact load input from the side of the vehicle.

It is a perspective view which shows the vehicle body lower part structure in 1st Embodiment of this invention. It is a perspective view which shows the state which removed the sheet | seat from the vehicle body lower structure in 1st Embodiment of this invention. It is sectional drawing which follows the III-III line | wire of FIG. 2 in 1st Embodiment of this invention. It is sectional drawing which expands and shows the IV section of FIG. 3 in 1st Embodiment of this invention. It is a perspective view which shows the state fractured | ruptured by the VV line | wire of FIG. 4 in 1st Embodiment of this invention. It is a perspective view which shows the state fractured | ruptured by the VI-VI line of FIG. 2 in 1st Embodiment of this invention. It is a perspective view which expands and shows the VII part of FIG. 6 in 1st Embodiment of this invention. It is a perspective view which shows the battery pack and battery pack frame unit in 1st Embodiment of this invention. It is a perspective view which shows the connection state of a floor cross member and a battery cross member in 1st Embodiment of this invention. It is sectional drawing which follows the XX line of FIG. 2 in 1st Embodiment of this invention. It is sectional drawing which shows the state which decomposed | disassembled the left flame | frame part from the vehicle body lower part structure in 1st Embodiment of this invention. It is a perspective view which shows the state fractured | ruptured by the XII-XII line | wire of FIG. 4 in 1st Embodiment of this invention. In 1st Embodiment of this invention, when an impact load is input from the side of a vehicle, it is sectional drawing explaining the example which protects a battery with a vehicle body lower structure. It is sectional drawing which shows the vehicle body lower part structure in 2nd Embodiment of this invention. It is sectional drawing which shows the left flame | frame part of the vehicle body lower structure in 2nd Embodiment of this invention. It is sectional drawing which shows the battery cross member of the vehicle body lower structure in 2nd Embodiment of this invention.

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

(First embodiment)
As shown in FIGS. 1 and 2, the vehicle body 10 includes a vehicle body lower structure 12 that constitutes a lower portion of the vehicle body 10. The vehicle body lower structure 12 includes a left side sill 14, a right side sill 15, a floor panel 16, a floor cross member unit 18, a battery pack 20 (see FIG. 3), a battery pack frame unit 22 (see FIG. 3), A driver seat 24 and a passenger seat 26 are provided.
In addition, since the vehicle body lower structure 12 is comprised by the substantially left-right symmetric member, hereafter, the left side structural member is demonstrated and description of the right side structural member is abbreviate | omitted.

As shown in FIGS. 2 and 3, the left side sill 14 is provided on the left side (outer side) 10 a of the vehicle body 10 and extends in the longitudinal direction of the vehicle body. The right side sill 15 is provided on the right side (outer side) 10b of the vehicle body 10 and extends in the vehicle longitudinal direction.
A floor panel 16 is attached to the left side sill 14 and the right side sill 15 in an erected state. A floor cross member unit 18 is attached to the upper surface 16 a of the floor panel 16.
The floor cross member unit 18 includes a first floor cross member 31, a second floor cross member 32, and a third floor cross member 33.

The first floor cross member 31 is disposed in the vehicle interior 35 on the front side of the vehicle body. The first floor cross member 31 includes a left first floor cross member 31A and a right first floor cross member 31B.
The first floor cross member 31A on the left side is installed on the left side sill 14 and the floor tunnel 37 in the vehicle width direction. The first floor cross member 31B on the right side is installed on the right side sill 15 and the floor tunnel 37 in the vehicle width direction.
The first floor cross member 31A on the left side and the first floor cross member 31B on the right side are arranged linearly in the vehicle width direction.
The floor tunnel 37 is a portion that bulges upward in the center of the floor panel 16 in the vehicle width direction.

  The first floor cross member 31A on the left side is a member that is substantially symmetrical with the first floor cross member 31B on the right side. Therefore, hereinafter, the left first floor cross member 31A will be described as “first floor cross member 31”, and the description of the right first floor cross member 31B will be omitted.

The first floor cross member 31 is installed on the left side sill 14 and the right side sill 15 so as to face the vehicle width direction.
The second floor cross member 32 is disposed on the vehicle body rear side of the first floor cross member 31. The second floor cross member 32 is installed on the left side sill 14 and the right side sill 15 in the vehicle width direction, and extends in parallel with the first floor cross member 31.
The third floor cross member 33 is disposed on the vehicle body rear side of the second floor cross member 32. The third floor cross member 33 is installed on the left side sill 14 and the right side sill 15 in the vehicle width direction, and extends in parallel with the second floor cross member 32.

The first floor cross member 31, the second floor cross member 32, and the third floor cross member 33 are provided at intervals in the longitudinal direction of the vehicle body.
For example, a driver seat 24 (see FIG. 1) is attached to the right half of the first floor cross member 31B and the second floor cross member 32 on the right side with fastening members such as bolts and nuts. For example, a passenger seat 26 (see FIG. 1) is attached to the left half of the first floor cross member 31 and the second floor cross member 32 with fastening members such as bolts and nuts. A rear seat is provided on the third floor cross member 33.

As shown in FIGS. 4 and 5, the left side sill 14 includes a side sill outer 41, a side sill inner 42, a stiffener 43, and a first energy absorbing member 44.
The side sill outer 41 is provided on the outer side in the vehicle width direction. The side sill outer 41 includes an outer bulging portion 46, an upper outer flange 47, and a lower outer flange 48. The outer bulging portion 46 bulges outward from the upper outer flange 47 and the lower outer flange 48 in the vehicle width direction. A reinforcing member 49 is attached to the inner surface of the outer bulging portion 46. The upper outer flange 47 projects upward from the upper end of the outer bulging portion 46. The lower outer flange 48 protrudes downward from the lower end of the outer bulging portion 46.

The side sill inner 42 is joined to the side sill outer 41 from the inside in the vehicle width direction, and is provided inside the side sill outer 41 in the vehicle width direction. The side sill inner 42 has an inner bulging portion 52, an upper inner flange 53, and a lower inner flange 54. The inner bulging portion 52 bulges inward in the vehicle width direction from the upper inner flange 53 and the lower inner flange 54.
The inner bulging portion 52 includes an inner upper portion 56, a first inner inner wall 57, an inner central portion 58, a second inner inner wall 59, and an inner lower portion 61. The inner upper portion 56 projects from the lower end of the upper inner flange 53 to the inside in the vehicle width direction. The first inner inner wall 57 projects downward from the inner end of the inner upper portion 56. The inner central portion 58 protrudes downward from the lower end of the first inner inner wall 57 toward the inner side in the vehicle width direction. The second inner inner wall 59 projects downward from the lower end of the inner central portion 58. The inner lower portion 61 protrudes from the lower end of the second inner inner wall 59 toward the outside in the vehicle width direction. A lower inner flange 54 projects downward from the lower end of the inner lower portion 61.

  The inner lower portion 61 extends so as to be orthogonal to the second inner inner wall 59. The inner corner portion 64 is formed in an orthogonal state by the inner lower portion 61 and the second inner inner wall 59. The inner corner portion 64 is formed in the lower portion of the left side sill on the inner side in the vehicle width direction.

  The stiffener 43 is interposed between the side sill outer 41 and the side sill inner 42. The stiffener 43 is formed in a flat plate shape. More specifically, the upper stiffener flange 43 b is joined between the upper outer flange 47 of the side sill outer 41 and the upper inner flange 53 of the side sill inner 42. Further, the lower stiffener flange 43 a of the stiffener 43 is joined between the lower outer flange 48 of the side sill outer 41 and the lower inner flange 54 of the side sill inner 42.

  By joining the lower outer flange 48, the lower stiffener flange 43a, and the lower inner flange 54, a side sill flange 66 is formed by the flanges 48, 43a, 54. The side sill flange 66 extends downward from the outer end portion 64a of the inner corner portion 64 on the outer side in the vehicle width direction, and the lower end portion 66a projects to the inner side in the vehicle width direction.

The left side sill 14 is formed by a side sill outer 41 and a side sill inner 42 in a rectangular frame outer shape (that is, a closed cross section). An upper stiffener flange 43 b of the stiffener 43 is interposed between the upper outer flange 47 and the upper inner flange 53. Further, the lower stiffener flange 43 a of the stiffener 43 is interposed between the lower outer flange 48 and the lower inner flange 54. Thereby, the stiffener 43 is arrange | positioned toward the up-down direction.
A side sill space 68 is formed between the side sill outer 41 and the side sill inner 42.

The first energy absorbing member 44 is disposed in the side sill space 68 (that is, a closed cross section). The first energy absorbing member 44 is attached to the side sill outer 41, and bulges to the side sill inner 42 side through the opening 43 c of the stiffener 43.
The first energy absorbing member 44 includes a first front wall 71, a first rear wall 72, a first side wall 73, a first front flange 74, and a first rear flange 75.

  A first front flange 74 projects from the base end of the first front wall 71 toward the front of the vehicle body. A first rear wall 72 is disposed at a distance from the first front wall 71 on the rear side of the vehicle body. A first rear flange 75 projects from the base end of the first rear wall 72 toward the rear of the vehicle body. The front end of the first front wall 71 and the front end of the first rear wall 72 are connected by a first side wall 73.

The first energy absorbing member 44 is formed in a U-shaped cross section by the first front wall 71, the first rear wall 72 and the first side wall 73. The first front flange 74 is joined to the side sill outer 41. The first rear flange 75 is joined to the side sill outer 41. As a result, the first energy absorbing member 44 is attached to the side sill outer 41 and bulges to the side sill inner 42 side through the opening 43 c of the stiffener 43.
Therefore, when the impact load F1 is input from the side of the vehicle Ve, the first energy absorbing member 44 can be crushed by the impact load F1.

  As described above, the first energy absorbing member 44 is attached to the side sill outer 41. Therefore, the degree of freedom of the shape of the side sill inner 42 can be increased, and the inner corner portion 64 can be easily formed in the side sill inner 42. By forming the inner corner portion 64 in a right-angle shape, the inner corner portion 64 can be satisfactorily engaged with a frame engaging portion 208 (described later) when an impact load F1 is input from the side of the vehicle Ve.

  As shown in FIGS. 6 and 7, the left side portion 16 b of the floor panel 16 is attached to the inner central portion 58 of the side sill inner 42. A first floor cross member 31 and a second floor cross member 32 extend in the vehicle width direction along the upper surface 16 a of the floor panel 16. The first floor cross member 31 and the second floor cross member 32 are provided at intervals in the longitudinal direction of the vehicle body.

The first floor cross member 31 includes a first member top portion 81, a first member front wall portion 82, a first member rear wall portion 83, a first member front flange 84, and a first member rear flange 85. .
A first member front wall portion 82 projects downward from the front side of the first member top portion 81 toward the floor panel 16. A first member rear wall portion 83 projects downward from the rear side of the first member top portion 81 toward the floor panel 16. The first floor cross member 31 is formed in a U-shaped cross section at the first member top portion 81, the first member front wall portion 82, and the first member rear wall portion 83.
Further, the first floor cross member 31 is formed in a cross-sectional hat shape by the first member top 81, the first member front wall 82, the first member rear wall 83, the first member front flange 84, and the first member rear flange 85. Has been.
The first member front flange 84 projects from the lower side of the first member front wall portion 82 along the upper surface 16a of the floor panel 16 to the front of the vehicle body. The first member rear flange 85 protrudes from the lower side of the first member rear wall 83 along the upper surface 16a of the floor panel 16 toward the rear of the vehicle body.

The first floor cross member 31 is attached to the upper surface 16 a of the floor panel 16 by joining the first member front flange 84 and the first member rear flange 85 to the upper surface 16 a of the floor panel 16. The first floor cross member 31 and the floor panel 16 form a closed cross section.
In this state, the left flange 86 of the first member top 81 is joined to the upper part of the left side sill 14 (specifically, the inner upper part 56 of the left side sill 14). Therefore, the first member top 81 of the first floor cross member 31 is arranged on the same plane with respect to the inner upper portion 56 of the left side sill 14.
In addition, the first floor cross member 31 has a first recess 88 (see also FIG. 4) that is recessed upward in the first member rear wall 83 that faces the second floor cross member 32.

The second floor cross member 32 includes a second member top portion 91, a second member front wall portion 92, a second member rear wall portion 93, a second member front flange 94, and a second member rear flange 95. .
A second member front wall portion 92 projects downward from the front side of the second member top portion 91 toward the floor panel 16. A second member rear wall portion 93 projects downward from the rear side of the second member top portion 91 toward the floor panel 16. The second floor cross member 32 is formed in a U-shaped cross section at the second member top portion 91, the second member front wall portion 92, and the second member rear wall portion 93.

Further, the second floor cross member 32 is formed in a cross-sectional hat shape by the second member top portion 91, the second member front wall portion 92, the second member rear wall portion 93, the second member front flange 94, and the second member rear flange 95. Has been.
The second member front flange 94 projects from the lower side of the second member front wall portion 92 along the upper surface 16a of the floor panel 16 to the front of the vehicle body. The second member rear flange 95 projects from the lower side of the second member rear wall portion 93 toward the rear of the vehicle body along the upper surface 16a of the floor panel 16.

The second floor cross member 32 is attached to the upper surface 16a of the floor panel 16 by joining the second member front flange 94 and the second member rear flange 95 to the upper surface 16a of the floor panel 16. The second floor cross member 32 and the floor panel 16 form a closed cross section.
In this state, the flange 96 of the second member top 91 is joined to the upper part of the left side sill 14 (specifically, the inner upper part 56 of the left side sill 14). Therefore, the second member top portion 91 of the second floor cross member 32 is disposed on the same plane with respect to the inner upper portion 56 of the left side sill 14.
The second floor cross member 32 has a second recess 97 that is recessed upward in the second member front wall portion 92 that faces the first floor cross member 31.

Incidentally, the passenger seat 26 (see FIG. 1) is supported by the left half of the first floor cross member 31 and the second floor cross member 32. That is, the first floor cross member 31 and the second floor cross member 32 are reinforced by the passenger seat 26. Therefore, the first recess 88 and the second recess 97 can be formed in a state where the strength of the first floor cross member 31 and the second floor cross member 32 is ensured.
Therefore, the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be transmitted to the first floor cross member 31 and the second floor cross member 32 as the load F2 through the first load path.

The first recess 88 and the second recess 97 are joined along the raised portion 38 (see FIG. 1) of the floor panel 16. That is, the floor panel 16 has a raised portion 38 that rises upward along the first recessed portion 88 and the second recessed portion 97.
The raised portion 38 of the floor panel 16 is raised upward along the first concave portion 88 and the second concave portion 97, so that a large space 98 below the floor panel 16 can be secured. Thereby, the capacity | capacitance of the battery pack 20 (namely, battery 99) arrange | positioned under a floor panel can be increased.

  Here, the raised portion 38 of the floor panel 16 is formed between the first floor cross member 31 and the second floor cross member 32. Therefore, the raised portion 38 is located below the passenger seat 26. For example, the raised portion 38 is disposed on the rear side of the vehicle body from the feet of the occupant seated on the passenger seat 26 (around the place where the occupant's feet are placed). Thereby, when the passenger | crew who seated on the passenger seat 26 puts a foot | leg, it can prevent that the protruding part 38 becomes obstructive.

As shown in FIGS. 7 and 8, a battery pack 20 (underfloor mounting component) is provided between the left side sill 14 and the right side sill 15 (see FIG. 2) and below the floor panel 16. The battery pack 20 includes a battery case 102, a plurality of battery cross members 104, and a tube housing part 106.
The battery case 102 includes a case wall portion (outer peripheral wall) 107, a case bottom portion 108, and a case flange 109.
The case wall 107 includes a case front wall 107a, a case rear wall 107b, a case left wall 107c, and a case right wall 107d. The case wall 107 is formed in a rectangular frame shape by the case front wall 107a, the case rear wall 107b, the case left wall 107c, and the case right wall 107d.
The case wall 107 is closed at the lower end by the case bottom 108 and has a case opening 111 at the upper end. A case flange 109 projects from the entire periphery of the case opening 111 to the outside of the battery case 102.

A plurality of battery cross members 104 are provided in the interior 112 of the battery case 102. The battery cross member 104 extends in the vehicle width direction inside the battery case 102.
The battery cross member 104 includes a battery cross member top 114, a battery cross member front wall 115, a battery cross member rear wall 116, a battery cross member front flange 117, a battery cross member rear flange 118, and a battery cross member. It has a left end flange 119, a battery cross member right end flange 121, and a battery cross member partition wall (partition wall) 122.

The battery cross member top 114 is disposed above the case bottom 108 (specifically, at the same height as the case opening 111) and extends in the vehicle width direction along the case bottom 108.
The battery cross member front wall 115 extends from the front side of the battery cross member top 114 toward the case bottom 108. The battery cross member rear wall 116 extends from the rear side of the battery cross member top 114 toward the case bottom 108.

A battery cross member front flange 117 projects from the lower side of the battery cross member front wall 115 toward the front of the vehicle body. A battery cross member rear flange 118 projects from the lower side of the battery cross member rear wall 116 toward the front of the vehicle body.
A battery cross member left end flange 119 projects from the left end portion of the battery cross member front wall portion 115 toward the front of the vehicle body. A battery cross member right end flange 121 projects from the left end portion of the battery cross member rear wall portion 116 toward the front of the vehicle body.

The battery cross member 104 is formed in a U-shaped cross section by the battery cross member top portion 114, the battery cross member front wall portion 115, and the battery cross member rear wall portion 116.
The battery cross member 104 is formed in a cross-sectional hat shape by the battery cross member top portion 114, the battery cross member front wall portion 115, the battery cross member rear wall portion 116, the battery cross member front flange 117, and the battery cross member rear flange 118. .

The battery cross member front flange 117 and the battery cross member rear flange 118 are joined to the case bottom 108.
Therefore, the battery cross member 104 is formed in a hollow shape (that is, a closed cross section) by the battery cross member top portion 114, the battery cross member front wall portion 115, the battery cross member rear wall portion 116, and the floor panel 16.

  The battery cross member partition wall 122 is provided at the center of the battery cross member 104 in the vertical direction. Specifically, the front flange 122 a of the battery cross member partition wall 122 is joined to the battery cross member front wall portion 115, and the rear flange 122 b of the battery cross member partition wall 122 is joined to the battery cross member rear wall portion 116. Thus, the battery cross member partition wall 122 is provided at the center of the battery cross member 104 in the vertical direction.

That is, the battery cross member 104 is vertically partitioned by the battery cross member partition wall 122. Therefore, the battery cross member 104 is divided into the cross member upper part 104a and the cross member lower part 104b by the battery cross member partition wall 122.
Thereby, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be transmitted to the cross member upper part 104a as a so-called horizontal load F3 through the route of the second load path. In addition, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be transmitted to the cross member lower portion 104b as a so-called offset load F4 through the third load path.
As described above, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be transmitted in two paths of the cross member upper part 104a and the cross member lower part 104b. As a result, a part of the impact load F1 can be favorably supported by the cross member upper part 104a and the cross member lower part 104b.

The battery cross member left end flange 119 is joined to the case left side wall 107 c of the battery case 102. The battery cross member right end flange 121 is joined to the case right side wall 107 d of the battery case 102.
In this state, the battery cross member 104 is arranged such that the top (upper surface) 114 of the battery cross member faces (opposites) the side sill center portion 14a (see FIG. 4) in the vertical direction of the left side sill 14. Therefore, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be reliably transmitted to the cross member upper part 104a as a so-called horizontal load through the route of the second load path.

As shown in FIG. 3, the battery cross member 104 is formed in a hollow shape and includes a fragile portion 124 and a strong portion 125.
The fragile portion 124 is formed in the outer region E1 on the outer side in the vehicle width direction. The strong portion 125 is formed in the inner region E2 on the inner side in the vehicle width direction.
As described above, the weakened portion 124 is formed in the outer region E1 of the battery cross member 104. Therefore, the impact load F1 input from the side of the vehicle Ve can be absorbed by crushing the fragile portion 124.
On the other hand, the strong portion 125 is formed in the inner region E2 of the battery cross member 104. Therefore, the remaining load absorbed by the fragile portion 124 can be supported by the strong portion 125.
Thereby, the floor panel (namely, vehicle body floor) 16 can be divided into the energy absorption area | region (namely, outer side area | region) E1 of the vehicle width direction outer side, and the protection area | region (namely, inner side area | region) E2 inside a vehicle width direction.

As shown in FIGS. 9 and 10, among the plurality of battery cross members 104, the battery cross members 104 in the third row from the front of the vehicle body are disposed below the first floor cross member 31.
Among the plurality of battery cross members 104, the battery cross members 104 in the fourth row from the front of the vehicle body are disposed below the second floor cross member 32.
Hereinafter, in FIGS. 9 and 10, the battery cross member 104 in the third row is described as the battery cross member 104 </ b> A for convenience. The battery cross member 104 in the fourth row will be described as a battery cross member 104B.

An outer mounting bracket 126 is provided on the floor panel 16 below the outer end side of the second floor cross member 32. A battery cross member 104B in the fourth row is connected to the outer mounting bracket 126 by an outer connecting member 127.
The outer connecting member 127 includes a collar 131, a bolt 132, and a nut 133. The collar 131 is disposed so as to extend in the vertical direction between the floor panel 16 below the second floor cross member 32 and the case bottom 108. Further, the collar 131 is arranged in a state of penetrating the inside 104c of the battery cross member 104B. The bolt 132 is inserted into the collar 131 from below the case bottom portion 108 through the case bottom portion 108, and a screw portion 132 a protrudes upward from the floor panel 16 and the outer mounting bracket 126. A nut 133 is screwed to the screw portion 132a.

An inner mounting bracket 135 is provided on the floor panel 16 below the inner end side of the second floor cross member 32. The battery cross member 104B is coupled to the inner mounting bracket 135 by an inner coupling member 136.
The inner connecting member 136 includes a collar 137, a bolt 138, and a nut 139. The collar 137 is disposed between the floor panel 16 below the second floor cross member 32 and the case bottom 108 so as to extend in the vertical direction. Further, the collar 137 is disposed in a state of penetrating the inside 104c of the battery cross member 104B. The bolt 138 is inserted into the collar 137 from below the case bottom portion 108 through the case bottom portion 108, and the screw portion 138 a protrudes upward from the inner mounting bracket 135. A nut 139 is screwed to the screw portion 138a.

Thus, the battery cross member 104B is connected to the floor panel 16 below the outer end side of the second floor cross member 32 by the outer connecting member 127 via the outer mounting bracket 126. In addition, the battery cross member 104B is connected to the floor panel 16 below the inner end side of the second floor cross member 32 by an inner connecting member 136 via an inner mounting bracket 135. Therefore, the floor panel 16 below the second floor cross member 32 is reinforced by the battery cross member 104B.
That is, the rigidity of the floor panel 16 below the first floor cross member 31 is enhanced. Thereby, even if the second floor cross member 32 and the battery cross member 104B partially have the weakened portion 124, the proof strength against the impact load F1 input from the side of the vehicle Ve can be improved.

An outer mounting bracket 141 and an inner mounting bracket 142 are provided on the floor panel 16 of the first picture floor cross member 31. A battery cross member 104A in the third row is connected to the outer mounting bracket 141 and the inner mounting bracket by the outer connecting member 144 and the inner connecting member.
The configuration in which the third row of battery cross members 104A is connected to the floor panel 16 of the first floor cross member 31 is the configuration in which the fourth row of battery cross members 104B is connected to the floor panel 16 of the second floor cross member 32. It is the same. Therefore, a detailed description of the configuration for connecting the battery cross member 104A in the third row to the floor panel 16 of the first floor cross member 31 is omitted.

  By connecting the battery cross member 104A in the third row to the floor panel 16 of the first floor cross member 31, the rigidity of the floor panel 16 below the second floor cross member 32 is increased. Thereby, even if the first floor cross member 31 and the battery cross member 104A partially have the weakened portion 124, the proof strength against the impact load input from the side of the vehicle Ve can be improved.

As shown in FIGS. 8 and 10, the battery cross member 104 has a battery cross member recess (recess) 148 at the center in the vehicle width direction. The battery cross member recess 148 is formed to be recessed downward.
A tube housing portion 106 is attached to the battery cross member recess 148 so as to extend in the longitudinal direction of the vehicle body. The pipe housing part 106 includes a pipe part 151, a left flange 152, and a right flange 153.

The tube part 151 is formed in a hollow closed cross section. A pipe 154, a hose 155, and the like are accommodated in the pipe portion 151. The left flange 152 projects from the left side of the pipe part 151 to the left in the vehicle width direction. The left flange 152 is attached to the left side portion 114 a of the battery cross member recess 148 in the battery cross member top portion 114.
The right flange 153 projects from the right side portion of the pipe portion 151 to the left side in the vehicle width direction. The right flange 153 is attached to the right side 114 b of the battery cross member recess 148 in the battery cross member top 114.
In other words, the tube housing portion 106 spans the battery cross member concave portion 148 and spans the left side portion 114a and the right side portion 114b of the battery cross member concave portion 148.

Thus, by forming the battery cross member recess 148 in the battery cross member 104, the battery housing 106 can be provided in the battery cross member recess 148. A pipe 154, a hose 155, and the like are accommodated in the pipe accommodating portion 106.
In addition, the battery housing member 106 is laid over the battery cross member recess 148 of the battery cross member 104, so that the battery cross member recess 148 is reinforced by the tube housing portion 106. Therefore, when a load is transmitted from the side of the vehicle Ve to the battery cross member 104, the transmitted load can be supported by the tube housing portion 106. Accordingly, the battery cross member recess 148 can be prevented from being broken by the transmitted load, and the transmitted load can be supported by the battery cross member 104.

As shown in FIGS. 8 and 11, a battery pack frame unit 22 is attached to the battery pack 20. The battery pack frame unit 22 includes a left frame portion (frame portion) 161, a right frame portion (frame portion) 162, and a front frame portion (frame portion) 163.
The left frame portion 161 is provided on the case left side wall 107 c of the battery case 102 from the outside of the battery case 102. The right frame portion 162 is provided on the case right side wall 107 d of the battery case 102 from the outside of the battery case 102.
The front frame portion 163 is provided on the case front wall 107 a of the battery case 102 from the outside of the battery case 102.
The left frame portion 161, the right frame portion 162, and the front frame portion 163 are configured similarly. Therefore, hereinafter, the left frame portion 161 will be described, and descriptions of the right frame portion 162 and the front frame portion 163 will be omitted.

The left frame portion 161 includes a first frame portion 165, a second frame portion 166, a first frame energy absorbing member (second energy absorbing member) 167, and a second frame energy absorbing member (second energy absorbing member) 168. And. The left frame portion 161 is formed in an L-shaped cross section.
The first frame portion 165 includes a first frame inner wall portion 171, a first frame outer wall portion 172, a first frame top portion 173, a first frame joint portion 174, and a first frame bottom portion 175.
The first frame inner wall portion 171 has an inner wall lower half 171a and an inner wall upper half 171b. The inner wall lower half 171a is raised substantially vertically. The inner wall upper half 171b extends in an inclined manner from the upper end of the inner wall lower half 171a to the first frame top 173 outward in the vehicle width direction and upward.

  The first frame outer wall portion 172 includes an outer wall center portion 172a, an outer wall upper portion 172b, and an outer wall lower portion 172c. The outer wall central portion 172a is disposed on the outer side in the vehicle width direction with respect to the first frame inner wall portion 171 and is raised substantially vertically. The outer wall upper part 172b extends in an inclined manner from the upper end of the outer wall central part 172a to the first frame top part 173 in the vehicle width direction and upward. The outer wall lower part 172c extends from the lower end of the outer wall central part 172a to the first frame bottom part 175 so as to be inclined inward in the vehicle width direction and downward.

The first frame top portion 173 communicates with the upper end of the inner wall upper half 171b and the upper end of the outer wall upper portion 172b.
The first frame joint portion 174 extends from the lower end of the inner wall lower half 171a toward the inner side in the vehicle width direction (specifically, the case bottom portion 108).
The first frame bottom portion 175 extends along the lower surface of the first frame joint portion 174 from the lower end of the outer wall lower portion 172c toward the inner side in the vehicle width direction (specifically, the case bottom portion 108).
The first frame inner wall 171, the first frame outer wall 172, the first frame top 173, and the first frame bottom 175 form the first frame 165 in a closed cross section.

The inner wall upper half 171 b of the first frame portion 165 is joined to the case left side wall 107 c of the battery case 102 and the battery cross member left end flange 119. In addition, the inner end 174 a of the first frame joint 174 and the inner end 175 a of the first frame bottom 175 are joined to the case bottom 108 of the battery case 102.
A first frame energy absorbing member 167 is accommodated in the interior 178 (that is, closed cross section) of the first frame portion 165.

The second frame portion 166 includes a second frame top portion 181, a second frame outer wall portion 182, a second frame inclined portion (inclined portion) 183, and a second frame flange 184.
The second frame outer wall portion 182 is disposed on the outer side in the vehicle width direction of the first frame portion 165, and is raised substantially vertically.
The second frame top portion 181 extends horizontally from the upper end of the second frame outer wall portion 182 toward the inner side in the vehicle width direction to the outer wall central portion 172a of the first frame outer wall portion 172.

The second frame flange 184 extends upward from the inner end of the second frame top 181 along the outer surface of the outer wall central portion 172a. The second frame flange 184 is joined to the outer wall central portion 172a.
The second frame inclined part 183 extends downward from the lower end of the second frame outer wall part 182 to the inner side in the vehicle width direction and downward to the outer wall lower part 172c of the first frame outer wall part 172. A lower portion 183a of the second frame inclined portion 183 is disposed along the lower surface of the outer wall lower portion 172c. The lower part 183a of the second frame inclined part 183 and the outer wall lower part 172c are joined.

The second frame flange 184 is joined to the outer wall central part 172a, and the lower part 183a of the second frame inclined part 183 is joined to the outer wall lower part 172c, whereby the second frame part 166 is attached to the first frame part 165. .
The second frame inclined portion 183 extends upwardly from the case bottom (lower surface) 108 side of the battery case 102 toward the lower end 66a of the side sill flange 66 so that the virtual extension line 186 intersects the side sill flange 66. Yes.

As shown in FIG. 4, the side sill flange 66 of the left side sill 14 is extended downward from the outer end 64 a of the inner corner 64 on the outer side in the vehicle width direction. Further, the second frame inclined portion 183 is extended upwardly from the case bottom 108 side toward the lower end portion 66a of the side sill flange 66 so that the virtual extension line 186 of the second frame inclined portion 183 intersects the side sill flange 66. It was.
Therefore, the second frame inclined portion 183 can be hidden by the side sill flange 66 so that the second frame inclined portion 183 is difficult to see from the outside of the vehicle Ve. Thereby, the large-sized battery pack 20 in which the case bottom 108 of the battery pack 20 is disposed below the left side sill 14 can be mounted on the vehicle Ve without affecting the appearance of the vehicle Ve.

A second frame inclined portion 183 is formed in the second frame portion 166. As a result, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve passes through the left frame portion 161 to the lower part of the battery cross member 104 (that is, the lower part of the cross member) 104b as a so-called offset load F4. I can tell you.
Further, the upper part (that is, the upper part of the cross member) 104 a of the battery cross member 104 faces the lower half of the left side sill 14. That is, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be transmitted to the cross member upper portion 104a as a so-called horizontal load F3.
Therefore, the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be distributed and transmitted to the cross member upper part 104a and the cross member lower part 104b. Thereby, the impact load F <b> 1 can be supported by the battery cross member 104. As a result, the large battery pack 20 in which the case bottom 108 of the battery pack 20 is disposed below the left side sill 14 can be protected from the impact load F1.

As shown in FIG. 11, the second frame part 166 is formed in a closed cross section at the second frame top part 181, the second frame outer wall part 182, the second frame inclined part 183, and the outer wall central part 172 a of the first frame part 165. ing.
A third energy absorbing member (namely, second energy absorbing member) 168 is accommodated in the interior 187 (namely, closed cross section) of the second frame portion 166.
That is, the first frame energy absorbing member 167 and the second frame energy absorbing member 168 (that is, the second energy absorbing member) are provided inside the left frame portion 161.

As shown in FIGS. 11 and 12, the first frame energy absorbing member 167 is housed in the interior 178 of the first frame portion 165. The first frame energy absorbing member 167 includes a second front wall 191, a second rear wall 192, a second side wall 193, a second front flange 194, and a second rear flange 195.
A second front flange 194 projects from the base end of the second front wall 191 toward the front of the vehicle body. A second rear wall 192 is disposed on the rear side of the vehicle body with respect to the second front wall 191. A second rear flange 195 projects from the base end of the second rear wall 192 toward the rear of the vehicle body. The front end of the second front wall 191 and the front end of the second rear wall 192 are connected by a second side wall 193.

  A first frame energy absorbing member 167 is formed in a U-shaped cross section at the second front wall 191, the second rear wall 192, and the second side wall 193. The second front flange 194 is joined to the first frame inner wall portion 171. A second rear flange 195 is joined to the first frame inner wall portion 171. Accordingly, the first frame energy absorbing member 167 is attached to the first frame inner wall portion 171.

The second frame energy absorbing member 168 is housed in the interior 187 of the second frame portion 166. The second frame energy absorbing member 168 includes a third front wall 201, a third rear wall 202, a third side wall 203, a third front flange 204, and a third rear flange 205.
A third front flange 204 projects from the base end of the third front wall 201 toward the front of the vehicle body. A third rear wall 202 is arranged at a distance from the rear side of the vehicle body with respect to the third front wall 201. A third rear flange 205 projects from the base end of the third rear wall 202 toward the rear of the vehicle body. The tip of the third front wall 201 and the tip of the third rear wall 202 are connected by a third side wall 203.

  A second frame energy absorbing member 168 is formed in a U-shaped cross section at the third front wall 201, the third rear wall 202, and the third side wall 203. The third front flange 204 is joined to the second frame inclined portion 183. The third rear flange 205 is joined to the second frame inclined portion 183. Thereby, the second frame energy absorbing member 168 is attached to the second frame inclined portion 183.

As shown in FIGS. 4 and 11, the first frame energy absorbing member 167 and the second frame energy absorbing member 168 can be crushed by the impact load F1 input from the side of the vehicle Ve. When the first frame energy absorbing member 167 and the second frame energy absorbing member 168 are crushed by the impact load F1, the inner corner portion 64 of the left side sill 14 can be satisfactorily engaged with the left frame portion 161.
Thereby, a part of the impact load F1 input to the left side sill 14 from the side of the vehicle Ve can be reliably transmitted to the cross member lower portion 104b of the battery cross member 104 via the left frame portion 161 as a so-called offset load F4. it can.

The left frame portion 161 has a frame engagement portion (engagement portion) 208. The frame engaging portion 208 is arranged so that the outer wall central portion 172a of the first frame outer wall portion 172 and the second frame top portion 181 intersect (specifically, orthogonal), thereby the outer wall central portion 172a and the first frame outer portion 172a. A two-frame top 181 is formed. In other words, the frame engaging portion 208 is formed in an L-shaped cross section by the upper portion 172d of the outer wall central portion 172a and the second frame top portion 181.
As described above, the left frame portion 161 includes the frame engaging portion 208 and the second frame inclined portion 183. The left frame portion 161 is formed in an L-shaped closed cross section by the frame engaging portion 208, the second frame inclined portion 183, and the like.

When the second frame top portion 181 of the second frame portion 166 is in contact with the inner lower portion 61 of the left side sill 14 from below, the second frame portion 166 is attached to the inner lower portion 61 with a bolt 211, a nut 212 (see FIG. 4), and the like. It is attached.
In this state, the frame engaging portion 208 is opposed (opposed) to the inner corner portion 64 of the left side sill 14 (see FIG. 4). Further, the left frame portion 161 is formed in an L-shaped closed cross section by the frame engaging portion 208, the second frame inclined portion 183, and the like.

Therefore, the frame engaging portion 208 is firmly formed on the left frame portion 161. That is, the inner corner portion 64 (that is, the left side sill 14) can be reliably received by the left frame portion 161 in which the frame engaging portion 208 is formed. Thereby, when the impact load F1 is input from the side of the vehicle Ve, the impact load F1 input to the left side sill 14 can be reliably transmitted to the left frame portion 161.
The left frame portion 161 is joined to the battery cross member left end flange 119 via the case left side wall 107 c of the battery case 102. Therefore, the battery cross member 104 is disposed to face the left frame portion 161. Thereby, the load transmitted to the left frame portion 161 can be transmitted to the battery cross member 104, and the transmitted load can be supported by the battery cross member 104.

Next, an example in which the battery 99 is protected by the vehicle body lower structure 12 when an impact load F5 is input from the side of the vehicle Ve will be described with reference to FIG.
In order to facilitate understanding of the description, an example in which the impact load F5 is input to the first floor cross member 31 will be described.
As shown in FIG. 13, the obstacle 220 collides from the side of the vehicle Ve. For this reason, the impact load F5 is input to the left side sill 14 from the side of the vehicle Ve. The outer bulging portion 46 of the side sill outer 41 of the left side sill 14 is deformed inward in the vehicle width direction by the impact load F5 input to the left side sill 14. The outer bulging portion 46 is deformed, and the first energy absorbing member 44 is crushed by the impact load F5 to absorb the impact energy.

A part of the remaining load absorbed by the first energy absorbing member 44 can be transmitted to the first floor cross member 31 as the load F6 along the route of the first load path.
In this state, the inner corner portion 64 of the left side sill 14 is reliably received by the frame engaging portion 208 of the left frame portion 161. Therefore, the remaining load is transmitted to the left frame portion 161 via the inner corner portion 64 and the frame engaging portion 208 of the left side sill 14.
When the load F7 is transmitted to the left frame portion 161, the second frame energy absorbing member 168 and the first frame energy absorbing member 167 of the left frame portion 161 are crushed by the load F7 and absorb impact energy.

  The left frame portion 161 is joined to the battery cross member left end flange 119 via the case left side wall 107 c of the battery case 102. Therefore, the battery cross member 104 is disposed to face the left frame portion 161. Thereby, the load F7 transmitted to the left frame portion 161 can be transmitted to the battery cross member 104, and the transmitted load can be supported by the battery cross member 104.

Here, the upper part 104 a of the battery cross member 104 faces the lower half of the left side sill 14. Therefore, a part of the load transmitted to the left frame portion 161 can be transmitted as a so-called horizontal load F8 to the cross member upper portion 104a through the route of the second load path.
Further, a second frame inclined portion 183 is formed in the second frame portion 166. Therefore, the remaining load transmitted to the left frame portion 161 can be transmitted as a so-called offset load F9 to the cross member lower portion 104b through the left frame portion 161 through the path of the third load path.

Thus, the impact load F5 input from the side of the vehicle Ve can be satisfactorily absorbed by the first energy absorbing member 44, the first frame energy absorbing member 167, and the second frame energy absorbing member 168. Furthermore, the impact load F5 input from the side of the vehicle Ve can be distributed to the routes of the first to third load paths.
Therefore, the loads F6, F8, and F9 dispersed in the first to third load path routes can be favorably supported by the first floor cross member 31 and the battery cross member 104. Thereby, the battery 99 accommodated in the inside 112 of the battery case 102 can be protected from the impact load F5.

  Next, the vehicle body lower structure 300 according to the second embodiment will be described with reference to FIGS. In the vehicle body lower structure 300 of the second embodiment, the same members as those of the vehicle body lower structure 12 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Note that the vehicle body lower structure 300 of the second embodiment has a substantially bilaterally symmetric configuration, similar to the vehicle body lower structure 12 of the first embodiment. Therefore, hereinafter, the left side configuration of the vehicle body lower structure 300 will be described, and the description of the right side configuration will be omitted.

(Second Embodiment)
As shown in FIG. 14, in the vehicle body lower structure 300, a left side sill 302, a floor cross member 304, a battery cross member 306, and a left frame portion (frame portion) 308 are formed of an aluminum alloy. Other configurations of the vehicle body lower structure 300 are the same as those of the vehicle body lower structure 12 of the first embodiment.
By forming the left side sill 302, the floor cross member 304, the battery cross member 306, and the left frame portion 308 from an aluminum alloy, the vehicle body lower structure 300 can be reduced in weight. Furthermore, fuel efficiency can be improved by reducing the weight of the lower body structure 300.

The left side sill 302 is a member extruded from an aluminum alloy. The left side sill 302 has a side sill outer wall 311, a side sill inner wall 312, a side sill top 313, a side sill bottom 314, a side sill flange 315, and a first energy absorbing member 316.
The left side sill 302 is formed in a rectangular closed cross section by the side sill outer wall 311, the side sill inner side wall 312, the side sill top 313, and the side sill bottom 314.
A first energy absorbing member 316 is accommodated inside the rectangular closed cross section of the left side sill 302. The impact load F10 input from the side of the vehicle Ve can be absorbed by the first energy absorbing member 316.

The side sill inner side wall 312 has a side sill lower half 312a that forms a lower half in the vertical direction. The side sill bottom 314 has a side sill inner half 314a that forms an inner half in the vehicle width direction. The side sill lower half 312a and the side sill inner half 314a are formed to intersect (specifically, orthogonally). An inner corner 318 is formed by the side sill lower half 312a and the side sill inner half 314a. A side sill flange 315 extends downward from an outer end portion 314b of the inner corner portion 318 on the outer side in the vehicle width direction.
That is, the left side sill 302 is formed in the same manner as the left side sill 14 of the first embodiment by extrusion molding of an aluminum alloy.

  The floor cross member 304 is formed in the same manner as the first floor cross member 31 and the second floor cross member 32 of the first embodiment by extrusion molding of an aluminum alloy. A part of the remaining load absorbed by the first energy absorbing member 316 is transmitted to the floor cross member 304 as a load F11 through the path of the first load path.

As shown in FIG. 15, the left frame portion 308 is formed in the same manner as the left frame portion 161 of the first embodiment by extrusion molding of an aluminum alloy.
The left frame portion 308 includes a first frame portion 321, a second frame portion 322, a first frame energy absorbing member (second energy absorbing member) 323, and a second frame energy absorbing member (second energy absorbing member) 324. And. The left frame portion 308 has an L-shaped cross section.

The first frame portion 321 includes a first frame inner wall portion 326, a first frame outer wall portion 327, a first frame top portion 328, and a first frame bottom portion 329. An inner end 329 a of the first frame bottom 329 is joined to the case bottom 108 of the battery case 102 from below. The first frame outer wall portion 327 has an outer wall lower portion 327a. The outer wall lower portion 327a extends downwardly to the first frame bottom portion 329 on the inner side in the vehicle width direction and downward.
The second frame portion 322 includes a second frame top portion 331, a second frame outer wall portion 332, and a second frame inclined portion (inclined portion) 333.

The second frame inclined portion 333 extends downward from the lower end of the second frame outer wall portion 332 to the upper end of the outer wall lower portion 327a toward the inner side in the vehicle width direction and downward.
The second frame inclined portion 333 extends upwardly from the case bottom (lower surface) 108 side of the battery case 102 toward the lower end 315a of the side sill flange 315 so that the virtual extension line 336 intersects the side sill flange 315. Yes.
Therefore, the second frame inclined portion 333 can be hidden by the side sill flange 315 so that the second frame inclined portion 333 is difficult to see from outside the vehicle Ve. As a result, the large battery case 102 (that is, the battery pack) in which the case bottom 108 of the battery pack is disposed below the left side sill 302 can be mounted on the vehicle Ve without affecting the appearance of the vehicle Ve.

The left frame portion 308 has a frame engagement portion (engagement portion) 338. The frame engaging portion 338 is formed by the outer wall upper portion 327b and the second frame top portion 331 by arranging the outer wall upper portion 327b of the first frame outer wall portion 327 and the second frame top portion 331 to intersect (orthogonal). ing. In other words, the frame engaging portion 338 is formed in an L-shaped cross section by the outer wall upper portion 327 b and the second frame top portion 331.
Thus, the left frame portion 308 is formed in an L-shaped closed section by the frame engaging portion 338, the second frame inclined portion 333, the outer wall lower portion 327a, and the like. The frame engaging portion 338 is opposed (opposed) to the inner corner portion 318 of the left side sill 302.

Therefore, the inner corner portion 318 (that is, the left side sill 302) can be reliably received by the left frame portion 308 in which the frame engaging portion 338 is formed. Thereby, when the impact load F10 is input from the side of the vehicle Ve, the impact load F10 input to the left side sill 302 can be reliably transmitted to the left frame portion 308.
The left frame portion 308 has a first closed cross section and a second closed cross section. The first closed cross section is formed by the first frame portion 321. The second closed cross section is formed by the second frame portion 322 and the first frame outer wall portion 327.
The first frame energy absorbing member 323 is accommodated in the first closed cross section. A second frame energy absorbing member 324 is accommodated in the second closed cross section.

As shown in FIG. 16, the battery cross member 306 is formed in the same manner as the battery cross member 104 of the first embodiment by extrusion molding of an aluminum alloy.
The battery cross member 306 has a battery cross member top portion 341, a battery cross member front wall portion 342, a battery cross member rear wall portion 343, a battery cross member bottom portion 344, and a battery cross member partition 345.
The battery cross member 306 is partitioned vertically by a battery cross member partition 345. Therefore, the battery cross member 306 is divided into a cross member upper part 306 a and a cross member lower part 306 b by the battery cross member partition 345.

Referring back to FIG. 14, the battery cross member 306 is divided into a cross member upper part 306a and a cross member lower part 306b. Thereby, a part of the impact load F10 input to the left side sill 14 from the side of the vehicle Ve can be transmitted to the cross member upper part 306a as a so-called horizontal load F12 through the route of the second load path. In addition, a part of the impact load F10 input to the left side sill 302 from the side of the vehicle Ve can be transmitted to the cross member lower portion 306b as a so-called offset load F13 through the route of the third load path.
In this way, a part of the impact load inputted to the left side sill 302 from the side of the vehicle Ve can be divided and transmitted in two paths of the cross member upper part 306a and the cross member lower part 306b. As a result, a part of the impact load F10 can be favorably supported by the cross member upper part 306a and the cross member lower part 306b.

As shown in FIG. 15, according to the vehicle body lower structure 300 of the second embodiment, as in the vehicle body lower structure 12 of the first embodiment, the inside of the battery case 102 is detected from the impact load F10 input from the side of the vehicle Ve. The battery 99 accommodated in 112 can be protected from the impact load F10.
Specifically, in the vehicle body lower structure 300, the impact load F <b> 10 input from the side of the vehicle Ve is favorably received by the first energy absorbing member 316, the first frame energy absorbing member 323, and the second frame energy absorbing member 324. Can absorb. Furthermore, the impact load F10 input from the side of the vehicle Ve can be distributed as the loads F11, F12, and F13 on the first to third road paths.
Therefore, the loads F11, F12, and F13 dispersed in the first to third load path routes can be favorably supported by the floor cross member 304 and the battery cross member 306. Thereby, the battery 99 accommodated in the inside 112 of the battery case 102 can be protected from the impact load F10.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the battery pack 20 that is an under-floor mounted component is illustrated as an in-vehicle component, but the present invention is not limited thereto. It can also be applied to other parts such as a fuel tank and a fuel cell stack as other in-vehicle parts.

  Moreover, although the said embodiment demonstrated the example which protruded the lower end part 66a of the side sill flange 66 toward the vehicle width direction inner side, it is not restricted to this. As another example, the lower end portion 66a of the side sill flange 66 can be vertically projected downward. Alternatively, the lower end portion 66a of the side sill flange 66 can be projected outward in the vehicle width direction.

Ve ......... Vehicle 10 ......... Body 10a ... Left side (outside)
10b ...... Right side (outside)
12 ......... Lower body structure 14,302 ... Left side sill (side sill)
14a …… Side sill center (center)
15 ......... Right side sill (side sill)
16 ……… Floor panel 16a …… Top surface of floor panel 20 ……… Battery pack (under-floor mounted component)
24 ... Driver sheet (sheet)
26 ... Passenger seat (sheet)
31, 31A, 31B ... 1st floor cross member 32 ......... 2nd floor cross member 38 ......... Raised part 41 ......... Side sill outer 42 ......... Side sill inner 44, 316 ... 1st energy absorption member 64, 318 ... Inner corners 66,315 ... Side sill flanges 66a, 315a ... Lower ends of side sill flanges 81,91 ... First and second member tops (tops)
82, 83 ... first member front and rear wall portions (a pair of wall portions)
84, 85 ... Front and rear flanges of the first member (front and rear flanges)
88... First concave portion 92, 93 ... Front and rear wall portions of the second member (a pair of wall portions)
94, 95 ... 2nd member front flange, rear flange (front flange, rear flange)
97 ......... Second recess 102 ... Battery case 104, 104A, 104B ... Battery cross member (under-floor cross member)
104a ... Cross member upper part (upper part)
104b ... Cross member lower part (lower part)
106 …… Pipe housing part 107 …… Case wall (outer wall)
108 …… Case bottom (bottom)
114 …… Battery cross member top (top)
122 …… Battery cross member bulkhead
124 …… Vulnerable portion 125 …… Strong portion 148 …… Battery cross member recess (recess)
154 …… Piping 155 …… Hose 161 …… Left frame (frame)
162 ...... Right frame part (frame part)
163 …… Front frame part (frame part)
165 …… First frame portion 166 …… Second frame portion 167,323 …… First frame energy absorbing member (second energy absorbing member)
168, 324 ... Second frame energy absorbing member (second energy absorbing member)
178 ... Inside of the first frame part 183,333 ... Second frame inclined part (inclined part)
186, 336 ... virtual extension line 187 ... inside of second frame portion 208, 338 ... frame engaging portion (engaging portion)
E1 ......... Outer side area E2 ......... Inner side area F1, F5, F10 ... Impact load

Claims (10)

A side sill that is provided on the outside of the vehicle, has an inner corner formed at the inner lower portion in the vehicle width direction, and a side sill flange extending downward from the outer side of the inner corner in the vehicle width direction;
A floor panel attached to the side sill;
An underfloor mounting component provided below the floor panel and having a lower surface disposed below the side sill,
A frame portion disposed outside the underfloor mounted component and facing the inner corner portion,
The underfloor mounted component is
An underfloor cross member facing the frame part,
The frame part is
An engaging portion facing the inner corner,
An inclined portion extending upwardly from the lower surface side of the underfloor mounted component toward the lower end portion of the side sill flange so that a virtual extension line intersects with the side sill flange,
The underbody structure characterized by that. The frame part is
Provided on the outer peripheral wall of the underfloor mounted component,
An L-shaped closed cross section is formed by the engaging portion and the inclined portion.
The vehicle body lower part structure according to claim 1. The side sill is
Side sill outer on the outside in the vehicle width direction,
A side sill inner joined to the side sill outer from the inside in the vehicle width direction and forming a closed cross-section with the side sill outer;
A first energy absorbing member disposed on the closed cross section and attached to the side sill outer.
The vehicle body lower part structure according to claim 1 or 2, wherein the vehicle body lower part structure is provided. The frame part is
A second energy absorbing member disposed inside;
The vehicle body lower part structure according to any one of claims 1 to 3, wherein the vehicle body lower part structure is provided. The underfloor cross member is
The upper part is arranged so as to face the center part in the vertical direction of the side sill,
The vehicle body lower part structure according to any one of claims 1 to 4, wherein the vehicle body lower part structure is provided. The underfloor cross member is
A fragile portion formed in the outer region outside the vehicle width direction;
A solid portion formed in the inner region in the vehicle width direction inner side,
The vehicle body lower structure according to any one of claims 1 to 5, wherein The underfloor cross member is
Formed hollow,
Provided at the center in the vertical direction, and provided with a partition wall that partitions the underfloor cross member up and down,
The vehicle body lower structure according to claim 1, wherein the vehicle body lower structure is a vehicle body lower structure. Extending in the vehicle width direction along the upper surface of the floor panel, and includes a first floor cross member and a second floor cross member spaced in the longitudinal direction of the vehicle body,
The first floor cross member and the second floor cross member are:
It is formed in a cross-sectional hat shape at the top, a pair of walls, a front flange and a rear flange,
The front flange and the rear flange are joined to the upper surface of the floor panel;
A seat is supported on the first floor cross member and the second floor cross member,
The first floor cross member is
Having a first recess recessed upward in the wall facing the second floor cross member;
The second floor cross member is
Having a second recess recessed upward in the wall facing the first floor cross member;
The floor panel is
Having a raised portion that rises upward along the first and second recesses,
The vehicle body lower structure according to any one of claims 1 to 7, wherein The underfloor cross member is
Connected to the floor panel below the first floor cross member and the second floor cross member;
The vehicle body lower part structure according to claim 8. The underfloor cross member is
Having a recess formed in the center in the vehicle width direction with a downward recess;
It is attached to the concave portion so as to extend in the longitudinal direction of the vehicle body, and includes at least one of a pipe and a hose.
The vehicle body lower part structure according to any one of claims 1 to 9, wherein the vehicle body lower part structure is provided.

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