JP6517859B2 - Body floor structure - Google Patents

Description

  The present invention relates to, for example, a vehicle body floor structure such as a car.

  For example, Patent Document 1 discloses a vehicle body front structure for reinforcing a dash panel. In the vehicle body front structure disclosed in Patent Document 1, a dash cross member is disposed at the lower part of the dash lower panel as a closed cross section forming member.

  The dash cross member has an L-shaped cross section, and the rear end of the lower wall of the dash cross member is connected to the lower wall of the dash lower panel. At the lower part of the dash lower panel, an inclined surface connecting the front wall and the lower wall of the dash cross member is formed. Thus, in Patent Document 1, a closed cross section (lower closed cross section) extending along the vehicle width direction is formed by the front wall and the lower wall of the dash cross member and the inclined surface of the dash lower panel. .

JP 10-45034 A (FIG. 4)

  Incidentally, in the case of attaching the front side frame support portion for supporting the front side frame and the sub frame rear mount portion for supporting (mounting) the rear end portion of the sub frame to the vehicle body front structure disclosed in Patent Document 1 The dash cross member having the closed cross section serves as the obstructing member. For this reason, it becomes complicated to join the front side frame support portion and the sub frame rear mount portion to the lower surface portion of the dash cross member by welding means such as spot welding.

  That is, it is necessary to join the front side frame support portion and the sub frame rear mount portion in a state where the vehicle body is positioned at a predetermined position. Therefore, it can not be fixed to the vehicle body in a state in which the front side frame support portion or the like is attached in advance to the lower surface portion of the dash cross member. Therefore, after the dash cross member is fixed in advance to the vehicle body, it is necessary to attach the front side frame support etc. to the fixed dash cross member by spot welding etc. However, the lower side from the lower side of the dash lower panel The dash cross member protruding toward the rear becomes an obstacle and the mounting work becomes complicated.

  The present invention has been made in view of the above-mentioned point, and it is an object of the present invention to provide a vehicle body floor structure capable of easily performing an attaching operation such as a front side frame support portion while reducing the number of parts. Do.

In order to achieve the above object, according to the present invention, a pair of front side frames disposed on the front side of the vehicle and juxtaposed along the longitudinal direction of the vehicle, and a rear of the pair of front side frames are disposed. A dash lower panel having a bent portion at a lower portion, a front side frame support portion provided on the lower surface of the bent portion and supporting the rear end of the pair of front side frames, and a front floor on the top surface of the bent portion of the dash lower panel And a dash cross member portion formed as a closed cross section extending in the vehicle width direction by overlapping the front portion of the panel and joining the vehicle front and rear portions of the overlapping portion , the front side frame support portion being A front wall curving along the shape of the lower rear of the wheel house, and from the front wall toward the side sill inward in the vehicle width direction The front side frame support portion is a member connecting the front side frame and the side sill inner, and the rear wall of the front side frame support portion extends in the vehicle width direction. has a flat surface extending bottom wall of the front side frame supporting portion adjacent to said rear wall, characterized Rukoto which have a fastening section for fastening the battery pack mounting frame.

  According to the present invention, it is possible to obtain a vehicle floor structure capable of reducing the number of parts and facilitating the attachment work of the front side frame support portion and the like.

FIG. 1 is a bottom view of a vehicle body frame to which a vehicle body floor structure according to an embodiment of the present invention is applied, viewed from the lower surface side of the vehicle body. It is an enlarged bottom view of the vehicle body frame front part shown in FIG. It is the enlarged plan view which looked at the vehicle body frame shown in FIG. 1 from the vehicle body upper surface side. It is an enlarged side view of the body frame front part. It is a partial bottom view which shows the state which removed the sub-frame from the state shown in FIG. It is a partial bottom view which shows the state which removed the battery pack mounting frame from the state shown in FIG. It is sectional drawing along the VII-VII line of FIG. It is sectional drawing along the VIII-VIII line of FIG. It is a partially broken perspective view of a front side frame support part. FIG. 5 is a partial cross-sectional perspective view of a front portion of a vehicle body frame broken along a vehicle width direction. It is a partial cross section perspective view which shows a dash cross member part typically. It is a partially sectioned perspective view which shows the state which removed the upper tunnel part and the front floor panel from FIG. It is an end elevation along the XIII-XIII line of FIG. It is a partially broken perspective view of the front side frame support part connected to a side sill. It is a partial cross section perspective view along the XV-XV line of FIG. (A) is a cross-sectional schematic diagram along the XVIA-XVIA line of FIG. 15, (b) is a cross-sectional schematic diagram along the XVIBA-XVIB line of FIG. It is the perspective view which looked at the support part main body of the front side frame support part from diagonally back. It is a perspective view of a battery pack loading frame. FIG. 19 is a cross-sectional view along the line XIX-XIX of FIG. 18;

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each of the drawings, "front and rear" indicates the vehicle longitudinal direction, "left and right" indicates the vehicle width direction (left and right direction), and "upper and lower" indicate the vertical direction.

  As shown in FIG. 1, the electric vehicle 10 has a vehicle body frame 12. The vehicle body frame 12 includes a vehicle body frame front portion 12a, a vehicle body frame rear portion 12b, and a battery storage portion 12c disposed between the vehicle body frame front portion 12a and the vehicle body frame rear portion 12b for storing a battery as an electrical component. Is configured. The electric components are not limited to batteries, and include, for example, fuel cells and the like. Further, the vehicle to which the vehicle body floor structure according to the present embodiment is applied is not limited to the electric vehicle 10, and can be applied to, for example, a normal automobile driven by an internal combustion engine.

  As shown in FIGS. 1 to 4, the vehicle body frame front portion 12 a includes a pair of left and right front side frames 42, a pair of left and right front side frame support portions 44, a subframe (front subframe) 46, and a pair of left and right Upper member 48, and a dash lower panel (dashboard lower) 50. A pair of left and right front cross members 52 extending toward the outer side in the vehicle width direction is connected to front ends of the pair of left and right front side frames 42 respectively.

  Since the pair of left and right front side frames 42 and front side frame support portions 44 are arranged symmetrically, the left side front side frame 42 and front side frame support portion 44 will be described in detail. The description of the frame 42 and the front side frame support portion 44 is omitted. The sub-frame 46 is configured to include a pair of left and right side frames, a front cross member, a rear cross member, and the like.

  As shown in FIG. 5, the pair of left and right front side frames 42 extend substantially in parallel along the longitudinal direction of the vehicle, and an impact load (front collision load) is input when the vehicle makes a head-on collision. In FIG. 5, the right side front side frame 42 is not shown.

  As shown in FIG. 3, a dash lower panel 50 extending along the vehicle width direction is disposed at the rear of the pair of left and right front side frames 42. As shown in FIG. 7, the dash lower panel 50 is bent in a substantially arc shape in cross section from a front end of a vertical portion 50 a extending substantially vertically upward, a horizontal portion 50 b extending substantially horizontal, and a horizontal portion 50 b. And a bent portion 50c rising obliquely upward toward the vertical portion 50a.

  The rear ends of the pair of left and right front side frames 42 are supported by the front side frame support portions 44 on the lower surface of the bending portion 50 c of the dash lower panel 50 at the front of the floor. A front portion 31 a of the front floor panel 31 along the vehicle longitudinal direction is formed to curve upward along the shape of the dash lower panel 50.

  The upper surface of the bent portion 50c of the dash lower panel 50 overlaps the front portion 31a of the front floor panel 31 in the vehicle vertical direction. The overlapping portion of the front portion 31a of the upper front floor panel 31 and the bent portion 50c of the lower dash lower panel 50 is joined at two places along the vehicle longitudinal direction by, for example, welding or the like. A dash cross member portion 51 formed as a closed cross section extending in the vehicle width direction is disposed in the overlapping portion (see FIGS. 7 to 11).

  As shown in FIG. 7, of the two joint portions, two joint portions of the dash lower panel 50 and the front floor panel 31 overlap and are jointed at the joint portion in front of the vehicle. In the joint portion at the rear of the vehicle, three sheets of a front floor panel 31, a dash lower panel 50, and a front side frame support portion 44 (a support portion main body 56 described later) are superimposed and joined. The two joint portions are respectively constituted by a plurality of joint portions along the vehicle width direction.

  As shown in FIG. 10, an upper tunnel portion 53 and a lower tunnel portion 55, which overlap in the vertical direction of the vehicle, are disposed at the central portion in the vehicle width direction. The lower tunnel portion 55 is formed to project upward and to extend along the longitudinal direction of the vehicle. A recessed groove 55a (see FIG. 12) connected to the bent portion 50c (see FIG. 7) of the front floor panel 31 is formed on the circumferential surface of the lower tunnel portion 55.

  That is, as shown in FIG. 12, the recessed groove 55 is formed continuously with the bent portion 55. The circumferential surface of the lower tunnel portion 55 is composed of three side surfaces exposed to the outside. In the present embodiment, the lower tunnel portion 55 is separately configured, and the lower end portions on both sides which are bent and formed into a substantially U-shaped cross section are joined to the dash lower panel 50. For example, the lower tunnel portion 55 and the dash lower panel 50 may be integrally configured. Further, in the present embodiment, the upper tunnel portion 53 is configured separately, and the lower end portions on both sides which are bent and formed into a substantially U-shaped cross section are joined to the front floor panel 31. For example, the upper tunnel portion 53 and the front floor panel 31 may be integrally configured.

  The upper tunnel portion 53 bulges upward and extends along the longitudinal direction of the vehicle. The upper tunnel portion 53 is constituted by a flat surface 53 a and overlaps the lower tunnel portion 55 in the vertical direction to cover the circumferential surface of the lower tunnel portion 55. A closed cross-section 57 is formed along the circumferential surface between the upper tunnel portion 53 and the lower tunnel portion 55 by the flat surface 53a of the upper tunnel portion 53 and the recessed groove 55a of the lower tunnel portion 55 (see FIG. 10). ). The upper tunnel portion 53 and the lower tunnel portion 55 are joined (welded) at a portion excluding the recessed groove 55a.

  The closed cross-section 57 is formed continuously with the dash cross member portion 51 (closed cross-section) adjacent to the left and right sides along the vehicle width direction via a protrusion 59c described later (thick line shown in FIG. 11) (Refer to the broken line part). A tunnel wall 59 having a U-shaped cross section and a rectangular opening 59a on the upper surface is continuously disposed in the rear of the lower tunnel 55 in the vehicle (see FIG. 11). The upper tunnel portion 53, the lower tunnel portion 55, and the tunnel wall 59 are collectively referred to as "tunnel".

  As shown in FIG. 12, positioning flange portions 61 and positioning projection portions 63 are respectively provided at the left and right outer end portions of the dash lower panel 50 in the vehicle width direction. The positioning flange portion 61 extends in the longitudinal direction of the vehicle, and includes a tongue bent upward. When the side sill 18, which is a positioning member, is assembled, the front end of the side sill 18 abuts on the positioning flange portion 61, whereby the side sill 18 is positioned at a predetermined position in the vehicle width direction (see FIG. 11). The positioning protrusion 63 is formed of two protrusions separated by a predetermined distance in the vehicle width direction. When the side sill 18, which is a positioning member, is assembled, the front end of the side sill 18 abuts between the two projections, whereby the side sill 18 is positioned at a predetermined position in the vehicle longitudinal direction (see FIG. 11).

  The side sill 18 is configured by integrally combining a side sill inner 18a on the inner side in the vehicle width direction and a side sill outer 18b on the outer side in the vehicle width direction (see FIG. 16 (b)). The side sill inner 18 a includes a bottom wall 21 a, a vertical surface 21 b and an inclined surface 23. On the bottom wall 21a, a plurality of lateral fastening portions 28 are disposed along the longitudinal direction of the vehicle. The vertical surface portion 21 b has a vertical surface along the vertical vertical direction. The inclined surface portion 23 is provided at the upper portion of the vertical surface portion 21 b and has an inclined surface 25 which falls from the outer side in the vehicle width direction toward the inner side in the vehicle width direction. A bent end 31 b inclined corresponding to the inclined surface 25 of the side sill inner 18 a is provided at the vehicle width direction outer edge portion of the front floor panel 31. The inclined surface portion 23 (inclined surface 25) of the side sill inner 18 a is joined to the bent end 31 b of the front floor panel 31.

  As shown in FIGS. 11 and 13, the front floor panel 31 is located at the center in the vehicle width direction, and includes a tunnel including an upper tunnel portion 53, a lower tunnel portion 55, and a tunnel wall 59. The tunnel has a raised portion 59c having its root raised toward the upper side of the vehicle (see FIGS. 9 and 11). Below the skirt portion 59b of the tunnel wall 59, a pair of underframes 65 extending along the longitudinal direction of the vehicle is provided. A closed cross section 67 extending along the longitudinal direction of the vehicle is formed by connecting the under frame 65 to the foot portion 59b of the tunnel wall 59 at a position rearward of the dash cross member portion 51 (see FIG. 13). . The closed cross section 67 is disposed below the skirts 59b on the left and right sides of the tunnel wall 59 (see FIGS. 11 and 13).

  The front side frame support portion 44 has a mount portion 69 provided with a front fastening portion 26 fastened to the battery pack mounting frame 16 (see FIGS. 15, 8 and 6). The mount portion 69 has a substantially rectangular shape in a bottom view, and extends along the vehicle width direction of the battery pack mounting frame 16. The closed cross section 67 formed by the under frame 65 and the like is disposed to face the mount portion 69 (see FIG. 6).

  The underframes 65 are disposed substantially parallel to the left and right sides of the tunnel wall 59, respectively. As shown in FIG. 6, the axial front end of the under frame 65 extends to the front of the floor. As shown in FIG. 13, each underframe 65 is composed of a bottom wall 65a, a first vertical wall 65b, a second vertical wall 65c, and a horizontal wall 65d. The first vertical wall 65 b rises from the inward end of the bottom wall 65 a toward the tunnel wall 59 and is joined to the inside of the tunnel wall 59. The second vertical wall 65c rises upward from the outer end of the bottom wall 65a in the vehicle width direction, and faces the first vertical wall 65b. The lateral wall 65d is bent from the second vertical wall 65c and joined to the protrusion 59c.

  As shown in FIG. 8, below the dash cross member portion 51, a sub-frame rear mounting portion 34 and a mounting portion 69 provided with a front fastening portion 26 for fastening the front portion of the battery pack mounting frame 16 are provided. , Are arranged sequentially from the front of the vehicle to the rear of the vehicle. The battery pack mounting frame 16 and the front fastening portion 26 will be described in detail later.

  As shown in FIG. 4, the sub-frame 46 is disposed downward of the pair of left and right front side frames 42, and is mounted with a power plant such as an electric motor (not shown) and a suspension mechanism. The pair of left and right upper members 48 are disposed on the outer side in the vehicle width direction of the pair of left and right front side frames 42, and are arranged to rise from the front cross member 52 (see FIGS. (See Figure 4).

  Between the pair of left and right front side frames 42 and the pair of left and right upper members 48, wheel houses 54 that surround left and right front wheels (not shown) are respectively provided (see FIGS. 1 to 3).

  As shown in FIGS. 5 and 6, each front side frame support 44 includes a support main body 56 that has a substantially right triangle shape in a plan view. As will be described later, the support portion main body 56 is provided with a vehicle body side right angle portion 58, a front fastening portion 26, and a lateral fastening portion 28, respectively. As shown in FIG. 17, the support portion main body 56 includes a bottom wall 56a, a front wall 56b, an inner wall 56c, a rear wall 56d, a front wall flange 56e, and an inner wall flange 56f. ing.

  As shown in FIGS. 15 and 17, the bottom wall 56 a is formed in a substantially triangular shape that gradually widens from the rear end of the front side frame 42 in plan view. The front wall 56b is curved along the shape of the rear lower portion of the wheel house 54, formed to extend outward in the vehicle width direction in plan view, and formed to rise upward from the bottom wall 56a There is. The inner side wall 56c has a flat surface 56g extending along the longitudinal direction and the vertical direction of the vehicle. The inner side wall 56c extends inward in the vehicle width direction of the bottom wall 56a along the longitudinal direction of the vehicle, and is formed to rise upward.

  The rear wall 56d is formed of a flat surface extending along the vehicle width direction and rising upward. The end in the vehicle width direction of the rear wall 56d is continuous so as to be substantially orthogonal to the inner wall 56c. The end in the vehicle width direction of the rear wall 56d is discontinuously spaced apart from the front wall 56b by a predetermined distance. A front wall flange portion 56e bent toward the outside in the vehicle width direction is provided at the upper end of the front wall 56b. At an upper end of the inner side wall 56c, an inner side wall flange portion 56f which is bent inward in the vehicle width direction is provided. A load transfer unit 60 described later is disposed between the outer end of the front side frame support 44 and the front end of the side sill 18.

  As shown in FIG. 6, the vehicle body side rectangular portion 58 corresponds to the vehicle body frame side (supporting portion main body 56 and load transmitting portion 60) corresponding to the battery side rectangular portion 14 (see FIG. 5) of the battery pack mounting frame 16. It is provided and disposed between the front side frame support 44 and the side sill 18. More specifically, the vehicle-body-side rectangular portion 58 is configured by combining the support portion main body 56 of the front side frame support portion 44 and the load transfer portion 60.

  As shown in FIG. 5, the front fastening portion 26 integrally couples the front side frame support portion 44 and the battery pack mounting frame 16 via the bolt B and the nut N which are fastening means. That is, three bolt insertion holes 62 are arranged at predetermined intervals in the vehicle width direction at a portion close to rear wall 56d of bottom wall 56a of support portion main body 56 that constitutes front side frame support portion 44. (See Figure 6). The bolts B are inserted into the bolt insertion holes 62 respectively formed in the bottom wall 56a of the support portion main body 56 and the to-be-fastened member 30, and the bolts B are fastened with the nuts N. A front fastening portion 26 that firmly fastens the battery pack mounting frame 16 is formed.

  A plurality of front fastening portions 26 are disposed along the vehicle width direction at the front end of the battery pack mounting frame 16, that is, at the front of the floor. In addition, in this embodiment, although the three front fastening parts 26 are arrange | positioned at the vehicle rear side of the support part main body 56, it is not limited to this. The front fastening portion 26 is also disposed on a sub-frame rear mount portion 34 (described later) adjacent to the inside in the vehicle width direction of the support portion main body 56.

  The lateral fastening portion 28 integrally couples the pair of left and right side sills 18 (side sill inner 18 a) and the battery pack mounting frame 16 via the vehicle-body-side rectangular portion 58. That is, a plurality of bolt insertion holes 64 are provided along the longitudinal direction of the vehicle on the lower surfaces of load transmitting portions 60 (described later) and side sills 18 (side sills inner 18a) respectively disposed on the left and right sides of battery pack mounting frame 16. They are spaced apart (see FIG. 6).

  The bolt B is inserted through the load transmitting portion 60, the side sill inner 18a, and the bolt insertion holes 62 and 64 respectively formed in the to-be-fastened member 30, and the bolt B is tightened with the nut N. A lateral fastening portion 28 in which the side sill 18 (including the load transfer portion 60) and the battery pack mounting frame 16 are firmly fastened is configured.

  A plurality of lateral fastening portions 28 provided in the load transfer portion 60 are respectively disposed on the left and right sides of the battery pack mounting frame 16 along the vehicle width direction and along the vehicle longitudinal direction. Note that the lateral fastening portion 28 in the load transfer unit 60 is configured such that three members consisting of the load transfer unit 60, the side sill inner 18a, and the battery pack mounting frame 16 clamp together (see FIG. 14).

  Also, as shown in FIGS. 5, 6, 15, and 17 (particularly, FIG. 15), the front side frame support portion 44 has a sub frame rear mount portion 34. As shown in FIG. 15, the sub-frame rear mount portion 34 is a composite shaped body in which two large and small substantially square-bottomed rectangular cylinders 66, 68 disposed on the vehicle front side and the vehicle rear side are integrally combined. It is configured. The large substantially bottomed rectangular cylinder 66 disposed on the front side of the vehicle has a bottom surface portion 66a and a plurality of side surface portions 66b rising upward from the bottom surface portion 66a. The small substantially bottomed rectangular cylinder 68 disposed on the rear side of the vehicle has a bottom surface portion 68a and a plurality of side surface portions 68b rising upward from the bottom surface portion 68a.

  An outer end in the vehicle width direction of the side surface portion 66 b of the large substantially bottomed rectangular cylindrical body 66 is connected (joined) to the inner side wall 56 c of the support portion main body 56. A subframe rear fastening portion 70 is provided on the inner side in the vehicle width direction of the bottom surface portion 66 a of the large substantially bottomed rectangular cylinder 66. The sub-frame rear fastening portion 70 fastens the rear end of the sub-frame 46 to the bottom surface portion 66 a via the reinforcing plate, the bolt B and the nut N. The small substantially bottomed rectangular cylinder 68 constitutes a mount portion 69. The mount 69 has a bottom 68. A front fastening portion 28 is provided on the rear end side of the bottom surface portion 68 a. The front fastening portion 28 fastens the to-be-fastened member 30 of the battery pack mounting frame 16 to the mount portion 69 via the bolt B and the nut N.

  Furthermore, the front side frame support portion 44 has a pair of left and right load transfer portions 60 that are inclined outward in the vehicle width direction from the front wall 56 b toward the side sill inner 18 a. As shown in FIGS. 14 and 15, each load transfer unit 60 includes a flat portion 60a, a front portion 60b, a curved portion 60c, and an inclined surface 60d. The flat portion 60 a extends substantially in parallel with the front floor panel 31. The front surface portion 60b is bent upward from the front end of the flat surface portion 60a and joined to the front wall 56b. The curved portion 60c is formed in a band shape that curves from the inside to the outside of the flat portion 60a. The inclined surface 60d corresponds to the inclined surface 25 of the side sill inner 18a and extends along the longitudinal direction of the vehicle.

  The front end of the curved portion 60c is joined to the inside of the front wall 56b, and the rear end of the curved portion 60c is joined to the front end of the side sill inner 18a. A clearance 72 extending in the vertical vertical direction is formed between the inner end of the front surface portion 60b and the curved portion 60c (see FIG. 9). The curved portions 60c of the pair of left and right load transmitting portions 60 have an end-spread shape that expands in a figure of eight toward the pair of left and right side sills 18a (side sills 18) from the front wall 56b in plan view.

  Furthermore, the front side frame support portion 44 has a flat inner side wall 56c along the vehicle vertical direction. Further, the sub-frame rear mounting portion 34 has a sub-frame back fastening portion 70 that fastens the vehicle rear end of the sub-frame 46 at the front of the floor. The sub-frame rear mount portion 34 provided with the sub-frame back fastening portion 70 is joined to the inner side wall 56 c. Further, the front side frame support portion 44 has a partition wall 74 connecting the front wall 56 b and the inner side wall 56 c. The partition wall 74 is disposed in the vehicle width direction toward the sub-frame rear mount portion 34.

  Thus, the front side frame support portion 44 includes the front wall 56b, the inner side wall 56c, and the rear wall 56d opposed to the front wall 56b. A front side frame rear fastening portion 71 for fastening the rear end of the front side frame 42 with a bolt B and a nut N is provided between the front wall 56b and the inner side wall 56c along the vehicle width direction (FIG. 15) reference). In FIG. 15, the front side frame 42 is not shown.

  As shown in FIGS. 1 and 18, the battery storage portion 12c has a battery-side rectangular portion 14 having at least one or more (two in the present embodiment) battery-side rectangular portions 14 at the front on the vehicle front side in plan view. A pack mounting frame 16 and a pair of left and right side sills 18 arranged on both sides of the battery pack mounting frame 16 along the vehicle width direction are provided.

  As shown in FIGS. 18 and 19, the battery pack mounting frame 16 includes a box portion 22 for housing one or more battery packs 20 therein, and a hollow frame portion 24 for supporting the box portion 22. It has with the to-be-fastened member 30 fixed to the outer side of the flame | frame part 24, and having the front fastening part 26 and the horizontal fastening part 28 (refer FIG. 5).

  The box portion 22 has a bottom wall 22a having a substantially rectangular shape in plan view, and a side wall 22b surrounding the bottom wall 22a and rising upward from the periphery of the bottom wall 22a (see FIG. 16B). And flanges 22c provided at the front end and the left and right ends of the side wall 22b. The bottom wall 22 a and the side wall 22 b form a space for housing the battery pack 20. This space portion is closed by a cover member 33 disposed between the lower side of the front floor panel 31 and the upper end of the box portion 22, as shown in FIGS. 16 (a) and 16 (b). .

  The frame portion 24 has a substantially rectangular shape that surrounds and supports the side wall 22 b of the box portion 22 and is formed of a hollow frame body having a closed cross section inside. A lower flange 24a extending toward the box portion 22 is provided at the lower portion of the frame portion 24 (see FIG. 16). The lower flange 24 a is joined to the lower surface of the bottom wall 22 a of the box portion 22.

  The to-be-fastened member 30 is formed of a frame having a substantially U-shape in plan view (see FIG. 1), and a front frame and left and right side frames along the vehicle width direction are integrally configured. ing. As shown in FIG. 16A, the to-be-fastened member 30 includes an upper wall 30a, a vertical wall 30b, a bending wall 30c, and an inclined wall 30d. The upper wall 30 a has a plurality of bolt insertion holes 32 and is provided at a position lower than the upper end 24 b of the frame portion 24. The vertical wall 30 b extends vertically upward continuously from the upper wall 30 a and is joined to the frame portion 24. The bending wall 30c is formed to bend downward from the upper wall 30a.

  As shown in FIG. 16 (a), the inclined wall 30d is formed to be inclined from the lower end of the bending wall 30c to the frame portion 24 so that the end thereof is coupled to the lower surface of the frame portion 24. It is done. The inclined wall 30d has a substantially circular shape, and a bolt mounting hole 30e for attaching a bolt B is formed. The to-be-fastened member 30 and the bolt insertion hole 32 function as the front fastening portion 26 and the lateral fastening portion 28 as described later.

  As shown in FIGS. 7 to 9 and FIG. 15, the front fastening portion 26 includes the upper wall 30 a (see FIG. 16A) of the fastened member 30 and a subframe rear mount portion 34 described later. A plurality of them are disposed at the rear end along the vehicle width direction. A plurality of lateral fastening portions 28 are disposed along a longitudinal direction of the vehicle on a flat portion 60a (see FIG. 14) of a load transfer portion 60 described later and the side sill inner 18a. The front fastening portion 26 and the lateral fastening portion 28 are fastened by, for example, a bolt B and a nut N which function as fastening means.

  Referring back to FIG. 18, the battery pack mounting frame 16 is a single vertical frame 36 extending in the vehicle longitudinal direction substantially at the center of the box portion 22 and the bottom wall upper surface of the box portion 22 adjacent to the pair of left and right side sills 18. It has a pair of battery support frames 38 disposed on (the inner wall bottom surface) and extending in the longitudinal direction of the vehicle, and a plurality of battery side cross members 40 disposed along the vehicle width direction substantially orthogonal to the vertical frame 36.

  The vehicle body frame 12 of the electric vehicle 10 according to the present embodiment is basically configured as described above. Next, its function and effect will be described.

  In the present embodiment, the front portion 31 a of the front floor panel 31 is vertically superimposed on the upper surface of the bending portion 50 c of the dash lower panel 50. The dash cross member portion 51 is formed as a closed cross section extending in the vehicle width direction by joining the two portions in the vehicle front and rear of the overlapping portion. Thus, in the present embodiment, the front side frame support portion 44 is supported by two joint portions in the front-rear direction of the closed cross section (the dash cross member portion 51), whereby the rigidity and strength of the front side frame support portion 44 are obtained. Can be improved.

  Further, in the present embodiment, by forming a closed cross section (the dash cross member portion 51) between the front floor panel 31 and the dash lower panel 50, a dash configured as another member in Patent Document 1 according to the related art The need for cross members is eliminated, and the number of parts can be reduced to reduce the manufacturing cost.

  Furthermore, in the present embodiment, the front side frame support portion 44 can be joined (for example, spot welded) to the lower portion of the dash lower panel 50 before forming the closed cross section (the dash cross member portion 51). The assembling accuracy of the frame 42 can be improved. On the other hand, in the vehicle body front structure disclosed in Patent Document 1, spot welding the front side frame support portion 44, the sub frame rear mount portion 34, and the like to the dash cross member having a closed cross section in advance. Is difficult. As a result, in the present embodiment, the mounting operation of the front side frame support portion 44 and the like can be easily performed.

  Furthermore, in the present embodiment, the indoor side (cabin side) of the closed cross section (the dash cross member portion 51) is formed by the smooth curved surface of the front floor panel 31 corresponding to the bending portion 50c, so the room habitability And design can be improved.

  Furthermore, in the present embodiment, a closed cross section 57 is formed along the circumferential surface between the upper tunnel portion 53 and the lower tunnel portion 55 by the flat surface 53 a of the upper tunnel portion 53 and the recessed groove 55 a of the lower tunnel portion 55. It is done. A closed cross section 57 formed along the circumferential surface between the upper tunnel section 53 and the lower tunnel section 55 is continuous (communicated) with the dash cross member section 51 which is an adjacent closed cross section along the vehicle width direction. There is. Thus, in the present embodiment, dash cross member portion 51, which is a closed cross section extending in the vehicle width direction, is either from the driver's seat or the passenger's seat, further across the tunnel, either the driver's seat or the passenger's seat. It can be formed continuously to the other sheet (see FIG. 11).

  Furthermore, in the present embodiment, the dash lower panel 50 has the positioning flange portion 61 and the positioning projection portion 63, and can position the side sill inner 18a at a predetermined position in the vehicle width direction and the vehicle front-rear direction. Thus, in the present embodiment, the assembly accuracy of the front floor panel 31 to which the side sill inner 18a is integrally welded can be improved in advance.

  Furthermore, in the present embodiment, the front side frame support portion 44 inclines outward in the vehicle width direction from the front wall 56b toward the side sill inner 18a and the front wall 56b curved along the shape of the lower rear of the wheel house 54. And a load transfer unit 60 (see FIG. 15). Thus, in the present embodiment, the front collision load input from the front side frame 42 is transmitted smoothly and efficiently from the front wall 56 b of the front side frame support portion 44 to the side sill 18 via the load transfer portion 60. (See FIG. 5).

  Furthermore, in the present embodiment, the rear wall 56d of the front side frame support portion 44 is formed of a flat surface extending in the vehicle width direction. The bottom wall 56 a of the front side frame support portion 44 adjacent to the back wall has a front fastening portion 26 for fastening the battery pack mounting frame 16. Thus, in the present embodiment, the battery pack mounting frame 16 which has been enlarged can be assembled to the vehicle body frame 12. Further, in the present embodiment, the support strength of the battery (battery pack mounting frame 16) can be enhanced by providing the dash cross member portion 51 which is a closed cross section.

  Furthermore, in the present embodiment, the side sill inner 18 a is provided with the sloped surface portion 23 having the sloped surface 25, and the sloped surface portion 23 is coupled to the front floor panel 31. Thus, in the present embodiment, the assemblability of the side sill inner 18a and the front floor panel 31 can be improved. Further, in the present embodiment, when the assembled front floor panel 31 is assembled to the dash lower panel 50 from the upper side, the inclined surface 25 of the inclined surface portion 23 abuts on the inclined surface 60d (see FIG. 14) of the load transfer portion 60. Positioning can be performed in the vehicle vertical direction and the vehicle width direction. Furthermore, in the present embodiment, the cross section of the bottom wall 21a of the side sill inner 18a (see FIG. 14 and FIG. 16B) is increased to laterally fasten the battery pack mounting frame 16 fixed to the bottom wall 21a. The rigidity and strength of the portion 28 can be enhanced.

  Furthermore, in the present embodiment, the under frame 65 is coupled to the raised portion 59 c of the front floor panel 31 to form a closed cross section 67 extending in the longitudinal direction of the vehicle at the root of the tunnel. The closed cross section 67 is disposed to face the mount portion 69 provided with the front fastening portion 26 of the subframe rear fastening portion 70 (see FIG. 6). Thus, in the present embodiment, the front collision load input from the front side frame 42 can be transmitted to the side sill 18, and the front collision load can be dispersed from the root of the tunnel via the closed cross section 67. .

  Furthermore, in the present embodiment, a raised portion 59c is provided by raising the foot portion 59b of the tunnel toward the upper side of the vehicle. Thus, in the present embodiment, the closed cross section 57 formed by the recessed groove 55a of the lower tunnel portion 55 and the flat surface 53a of the upper tunnel portion 53 extends along the vehicle width direction via the raised portion 59c. It can be made to communicate with the dash cross member 51.

  Furthermore, in the present embodiment, under the dash cross member 51, a sub-frame rear mount portion 34 supporting the rear end of the sub-frame 46 and a front fastening portion 26 fastening the front portion of the battery pack mounting frame 16 The provided mount portions 69 are sequentially arranged in a substantially straight line from the front of the vehicle toward the rear of the vehicle. As a result, in the present embodiment, the support strength of the sub-frame rear mount portion 34 and the mount portion 69 provided with the front fastening portion 26 of the battery pack mounting frame 16 can be enhanced.

10 Electric car (vehicle)
16 Battery pack mounting frame 18 Side sill (positioning member)
18a side sill inner 23 inclined surface 25 inclined surface 26 front fastening portion (fastening portion)
31 front floor panel 31a (at the front floor panel) front 50 dash lower panel 50c bent portion 51 dash cross member portion (closed cross section)
53 upper tunnel portion 53a flat surface 55 lower tunnel portion 55a recessed groove 57, 67 closed cross section 59b foot portion 59c raised portion 61 positioning flange portion 63 positioning projection portion 69 mount portion

Claims (7)

A pair of front side frames disposed on the front side of the vehicle and juxtaposed along the longitudinal direction of the vehicle;
A dash lower panel disposed behind the pair of front side frames and having a bend at a lower portion thereof;
A front side frame support portion provided on the lower surface of the bent portion and supporting the rear end of the pair of front side frames;
A dash cross member portion formed as a closed cross section extending in the vehicle width direction by overlapping the front portion of the front floor panel on the upper surface of the bent portion of the dash lower panel and joining the vehicle front and rear of the overlapping portion ,
Equipped with
The front side frame support portion has a front wall curved along the shape of a lower rear portion of the wheel house, and a load transfer portion inclined outward in the vehicle width direction from the front wall toward the side sill inner,
The front side frame support portion is a member connecting the front side frame and the side sill inner,
The rear wall of the front side frame support has a flat surface extending along the vehicle width direction,
Vehicle body floor structure bottom wall of the front side frame support part, characterized by Rukoto which have a fastening section for fastening the battery pack mounting frame adjacent to the rear wall. In the vehicle body floor structure according to claim 1,
At the rear of the vehicle in the dash lower panel,
A lower tunnel portion which is upwardly raised at the center of the dash lower panel in the vehicle width direction and extends along the longitudinal direction of the vehicle;
A recessed groove formed on a circumferential surface of the lower tunnel portion and connected to the bent portion;
It bulges upward at the center in the vehicle width direction of the front floor panel and extends along the longitudinal direction of the vehicle, and overlaps the lower tunnel portion in the vertical direction to cover the circumferential surface of the lower tunnel portion Upper tunnel section,
Is provided,
A closed cross section is formed along the circumferential surface between the upper tunnel portion and the lower tunnel portion by the flat surface of the upper tunnel portion and the concave groove of the lower tunnel portion,
A vehicle body floor structure characterized in that a closed cross section formed along the circumferential surface between the upper tunnel portion and the lower tunnel portion is continuous with the adjacent dash cross member portion along the vehicle width direction. . In the vehicle body floor structure according to claim 1 or 2,
The dash lower panel has a positioning flange portion for positioning the positioning member at a predetermined position in the vehicle width direction, and a positioning projection portion for positioning the positioning member at a predetermined position in the vehicle longitudinal direction. Construction. In the vehicle body floor structure according to claim 1 ,
The side sill inner has an inclined surface portion having an inclined surface,
The vehicle floor structure, wherein the sloped surface portion is combined with the front floor panel. In the vehicle body floor structure according to claim 2 ,
It has a tunnel located at the center in the vehicle width direction of the front floor panel and including the upper tunnel portion and the lower tunnel portion,
Below the foot of the tunnel, a pair of underframes extending along the longitudinal direction of the vehicle are provided.
A closed cross section extending along the longitudinal direction of the vehicle is formed by connecting the respective underframes to the skirt of the tunnel at a position rearward of the dash cross member at the vehicle rear side,
The front side frame support portion has a mount portion provided with a front fastening portion for fastening a front portion of the battery pack mounting frame,
The vehicle floor structure characterized in that the closed cross section faces the mount portion. In the vehicle body floor structure according to claim 5 ,
The vehicle floor structure according to the present invention, wherein the tunnel has a raised portion whose base is raised toward the upper side of the vehicle. In the vehicle body floor structure according to claim 1 ,
A sub-frame is disposed below the front side frame,
A sub-frame rear mount portion for supporting the rear end of the sub-frame and a mount portion provided with a front fastening portion for fastening a front portion of the battery pack mounting frame under the dash cross member portion; A vehicle floor structure characterized by being disposed sequentially from the front toward the rear of the vehicle.

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