JP2015160510A - Vehicle body lower part structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tie-down hole reinforcement structure which contributes to securing the rigidity required in side sills as well as to reinforcement of tie-down hole peripheral parts of the side sills in a vehicle body lower part structure of a vehicle in which a tie-down hole is provided at each side sill.SOLUTION: A reinforcement bracket 25 includes: a bracket body 27 which is joined to a tie-down hole 23 peripheral part on a bottom wall part 19d of a side sill inner 19 and reinforces the tie-down hole 23 peripheral part; a bracket flange 31 which extends from the bracket body 27 to the lower side and is joined to a lower flange 19f of the side sill inner 19; and a vertical wall part 29 which extends from the bracket body 27 to the upper side and is joined to a vertical wall part 19b.

Description

  The present invention relates to a vehicle body lower structure of a vehicle, and more particularly to a vehicle having a side sill in which a tie-down hole with which a tie-down hook is engaged is formed.

  2. Description of the Related Art Conventionally, a tie-down hole for fixing a vehicle when transported by various transport means such as a trailer, a railway freight car, and a transport ship is provided at the lower part of the vehicle body.

  An example of such a vehicle is disclosed in Patent Document 1. In the vehicle of this Patent Document 1, side sills extending in the vehicle front-rear direction are disposed on the left and right sides of the floor panel, and the lower surface of the floor panel is joined to the upper surface thereof. A cross member extending in the vehicle width direction is disposed on the lower surface of the floor panel, and an end of the cross member is joined to a side sill. A rear side frame extending in the vehicle front-rear direction is disposed inside the side sill in the vehicle width direction, and the rear side frame is joined to the lower surface of the floor panel. The rear side frame has a vertical width smaller than that of the side sill, and its bottom wall is located above the lower end of the side sill. A semicircular cutout is formed at a corner formed by a curved portion of the rear side frame of the rear side frame and a side sill in the bottom wall of the rear side frame. A tie-down bracket in which a tie-down hole for engaging a tie-down hook is formed on the bottom wall is fitted and fixed to the notch.

Japanese Patent Laid-Open No. 10-76978

  However, in the vehicle of Patent Document 1, when the tie-down hook is locked to the tie-down hole, the tie-down hook is passed through the vehicle body from the outside in the vehicle width direction and locked to the tie-down hole. At that time, the side sill is arranged on the outer side in the vehicle width direction of the tie-down bracket, that is, on the front side for the operator, and the operator has to pass the tie-down hook under the side sill and lock it. Locking work is difficult.

  Therefore, it is conceivable that the tie-down hole is not provided on the rear side frame side but on the side sill on the front side. And in that case, since the rigidity of a tie-down hole peripheral part falls, it is possible to reinforce by superposing a plurality of steel plates on the peripheral part.

  However, since the side sill is a member that extends in the vehicle front-rear direction at the side of the cabin, unlike the rear side frame, static rigidity (rigidity against the torsion of the cabin) and dynamic rigidity (rigidity against the side collision) are required. Therefore, the rigidity required for the side sill cannot be ensured simply by reinforcing the peripheral part of the side sill tie-down hole.

  The present invention has been made in view of such points, and the object of the present invention is not only to reinforce the periphery of the side sill tie-down hole in the vehicle body lower part structure in which the side sill is provided with a tie-down hole. An object of the present invention is to provide a reinforcing structure capable of contributing to ensuring the rigidity required for the side sill.

  In order to achieve the above object, according to the present invention, a reinforcing bracket provided for reinforcing the periphery of a tie-down hole is formed into a crank shape.

  Specifically, the present invention includes a pair of side sills extending in the vehicle front-rear direction, and a floor panel that connects the pair of side sills to form a floor surface of the passenger compartment, and the front floor panel of the floor panel includes: A kick-up portion that is stepped up at the rear of the vehicle is formed at the boundary with the rear floor panel at the rear of the vehicle, and is below the both ends of the rear floor panel in the vehicle width direction and inside the pair of side sills in the vehicle width direction. A pair of rear side frames extending in the vehicle front-rear direction, and a vehicle body lower portion of the vehicle in which a front end portion of each rear side frame is connected to an inner side in the vehicle width direction of each side sill at the rear of the kick up portion. The following solutions were taken for the structure.

  That is, according to a first aspect of the present invention, each of the side sills includes a side sill inner joined to the front end portion of the rear side frame, and a side sill outer joined to the side sill inner from the outside in the vehicle width direction. Is formed with a recess opening outward in the vehicle width direction and extending in the vehicle front-rear direction, and the side sill inner is joined to a front end portion of the rear side frame to form a bottom portion of the recess. An upper wall portion extending outward in the vehicle width direction from the upper end of the wall portion, a bottom wall portion extending outward in the vehicle width direction from the lower end of the vertical wall portion, and projecting downward from the bottom wall portion, the side sill outer is joined A flange, and the bottom wall portion is positioned below the lower end of the rear side frame and has a tie-down hole to which a tie-down hook is locked. Is provided with a reinforcing bracket that reinforces the peripheral portion of the tie-down hole, and the reinforcing bracket is joined to the peripheral portion of the tie-down hole on the bottom wall portion to reinforce the peripheral portion of the tie-down hole. And a lower joint portion extending downward from the bracket body and joined to the flange, and an upper joint portion extending upward from the bracket body and joined to the vertical wall portion. .

  According to the first invention, the reinforcing bracket is joined to the bottom wall portion of the side sill inner to reinforce the peripheral portion of the tie-down hole, the lower joint portion extending downward from the reinforcing portion, And an upper joint portion extending upward from the reinforcing portion. That is, the reinforcing bracket has a crank shape when viewed from the vehicle front-rear direction and has a high section modulus. Therefore, the reinforcing bracket can not only reinforce the peripheral portion of the tie-down hole with the reinforcing portion, but can also contribute to ensuring both rigidity against torsion and rigidity against side collision with respect to the side sill.

  Further, according to the first invention, the upper joint portion of the reinforcing bracket is joined to the vertical wall portion of the side sill inner. Therefore, when the tie-down hook is locked on the reinforcement portion around the tie-down hole and a downward tensile load is applied to the reinforcement portion, a part of the tensile load is longitudinally connected to the side sill inner via the upper joint portion. It acts on the wall and suppresses the reinforcement from being pulled downward. As a result, deformation of the reinforcing portion is suppressed. Therefore, the rigidity of the side sill can be further improved.

  According to the first invention, the lower joint portion of the reinforcing bracket is joined to the flange of the side sill inner. Therefore, when the tie-down hook is locked on the reinforcement part around the tie-down hole and a downward tensile load acts on the reinforcement part, the tensile load acts on the reinforcement bracket but acts on the flange of the side sill inner. Therefore, the side sill inner can be prevented from peeling off from the side sill outer.

  In a second aspect based on the first aspect, the bracket body is provided with a partition member that extends upward to the upper wall portion and partitions the inside of the recess in the vehicle front-rear direction. A joining piece to be joined to the wall portion is formed.

  According to 2nd invention, the reinforcement part on the bottom wall part of a side sill inner is joined to the upper wall part via the partition member and the joining piece. Therefore, when the tie-down hook is locked on the reinforcing portion around the tie-down hole and a downward tensile load acts on the reinforcing portion, a part of the tensile load is transferred to the upper wall via the partition member and the joining piece. Acting on the portion to suppress the reinforcing portion from being pulled downward. As a result, deformation of the reinforcing portion is suppressed. Therefore, the rigidity of the side sill can be further improved.

  According to a third invention, in the second invention, a pair of the partition members are provided on both sides of the bracket body in the vehicle front-rear direction.

  According to the third invention, the partition members are provided on both front and rear sides of the reinforcing portion of the vehicle. Therefore, when the tie-down belt extending from the tie-down hook mainly extends to the front and rear of the vehicle when the vehicle is fixed, the tensile load acts on the vehicle rear side and front side of the tie-down hole periphery, respectively. In addition, part of the tensile load acts on the upper wall portion via the vehicle rear side and front side partition members, thereby suppressing the reinforcing portion from being pulled downward.

  As described above, according to the present invention, it is possible to provide a tie-down hole reinforcing structure that can contribute not only to the reinforcement of the side sill of the side sill but also to the rigidity required for the side sill.

It is a bottom view showing the appearance of the back of the vehicle in the vehicle body lower part structure according to the embodiment of the present invention. It is the II section enlarged view of FIG. It is a perspective view which shows the vehicle body lower part structure of the vehicle which concerns on embodiment. FIG. 3 is a view corresponding to FIG. 2 in a state where a rear side frame is removed. It is the VV sectional view taken on the line of FIG. It is a side view of the vehicle body lower part structure of a vehicle in the state where a frame side outer panel and a side sill outer were removed. It is a figure which shows a reinforcement bracket, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the positional relationship of a reinforcement bracket, a floor panel, and a cross member. FIG. 7 is a view corresponding to FIG. 6 illustrating a vehicle body lower part structure according to a modification of the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the following description of preferable embodiment is only an illustration essentially, and is not intending restrict | limiting this invention, its application thing, or its use.

  FIG. 1 is a bottom view showing an appearance of the vehicle rear side of the vehicle body lower structure of the vehicle 1, and FIG. 2 is an enlarged view of a portion II in FIG. 1. In the figure, arrows Fr and Re indicate the vehicle front-rear direction, arrow F indicates the vehicle front, and arrow R indicates the vehicle rear. Furthermore, arrows R and L indicate the vehicle width direction, arrow R indicates the vehicle right direction, and arrow L indicates the vehicle left direction. Therefore, FIG. 2 shows a vehicle right side portion of the vehicle body lower structure.

  A pair of side sills 3 and 3 extending in the vehicle front-rear direction are provided at a lower portion of the vehicle body of the vehicle 1 with an interval in the vehicle width direction. A frame side outer panel 5 forming an external appearance is attached to the side surface of each side sill 3 on the outer side in the vehicle width direction. The pair of side sills 3 and 3 are connected by a floor panel 7 that forms a floor surface of a passenger compartment (not shown).

  The floor panel 7 includes a front floor panel 7a that forms a vehicle front side portion of the floor surface, and a rear floor panel 7b that is disposed behind the vehicle and forms a vehicle rear side portion of the floor surface. . A pair of rear side frames 9, 9 extend in the vehicle front-rear direction below both ends of the rear floor panel 7b in the vehicle width direction.

  A rear wheel house 11 is connected to the rear end of each side sill 3, and a knuckle 13 for supporting a wheel is provided inside the rear wheel house 11. A recess 9 a is formed in front of the rear wheel house 11 on the bottom surface of each rear side frame 9. A fixing bolt 15 for fixing the front end of the trailing arm 13, which is one of suspension suspension members, is disposed in the recess 9 a, and the trailing end of the trailing arm 13 is connected to the knuckle 13. ing.

  FIG. 3 is a perspective view of the lower structure of the vehicle body as viewed from the upper right front. In FIG. 3, the side sill 3 is omitted.

  The rear floor panel 7b is disposed above the vehicle relative to the front floor panel 7a. At the boundary between the front floor panel 7a and the rear floor panel 7b, the rear floor panel 7b is kicked up so as to rise rearward of the vehicle. A portion 7c is formed.

  A cross member 17 extending in the vehicle width direction is disposed behind the kick-up portion 7c in the vehicle width direction. The cross member 17 includes the pair of side sills 3, 3 disposed on both sides in the vehicle width direction. Are connected. Further, at the rear side of the kick-up portion 7c, the front end portion of each rear side frame 9 is joined to the side surface in the vehicle width direction of the side sill 3 disposed on the outer side in the vehicle width direction.

  The pair of side sills 3 have substantially the same configuration. Therefore, here, the configuration of the side sill 3 on the right side of the vehicle will be described, and the description of the configuration of the side sill 3 on the left side of the vehicle will be omitted.

  FIG. 4 is a view corresponding to FIG. 2 in a state where the rear side frame 9 is removed. FIG. 5 is a cross-sectional view taken along line VV in FIG.

  The side sill 3 has a closed cross-sectional shape as shown in FIG. 5, a side sill inner 19 disposed on the inner side in the vehicle width direction, a side sill outer 21 joined to the side sill inner 19 from the outer side in the vehicle width direction, have.

  The side sill outer 21 has a hat shape in cross section, and is formed with a recess 21a that opens inward in the vehicle width direction and extends in the vehicle front-rear direction.

  The side sill outer 21 includes a vertical wall portion 21b to which the frame side outer panel 5 is bonded to an outer surface and forms a bottom portion of the concave portion 21a, and an upper wall portion 21c extending inward in the vehicle width direction from the upper end of the vertical wall portion 21b. And a bottom wall portion 21d extending inward in the vehicle width direction from the lower end of the vertical wall portion 21b. Further, an upper flange 21e projects upward from the vehicle width direction inner end of the vertical wall portion 21b, while a lower flange 21f projects downward from the vehicle width direction inner end of the bottom wall portion 21d. The upper wall portion 21c is formed with a ridge portion 21g that protrudes inward in the vehicle width direction and extends in the vehicle front-rear direction, thereby increasing the rigidity of the side sill outer 21.

  On the other hand, the side sill inner 19 is joined to the front end of the rear side frame 9. The side sill inner 19 has a hat-like cross section like the side sill outer 21, and is formed with a recess 19a (a recess) that opens outward in the vehicle width direction and extends in the vehicle front-rear direction.

  The side sill inner 19 is joined to the front end portion of the rear side frame 9 and extends from the upper end of the vertical wall portion 19b to the vehicle width direction outside the vertical wall portion 19b (vertical wall portion) that forms the bottom of the concave portion 19a. It has an upper wall portion 19c and a bottom wall portion 19d that extends outward in the vehicle width direction from the lower end of the vertical wall portion 19b and faces the upper wall portion 19c. Further, the upper flange 19e projects upward from the vehicle width direction outer end of the upper wall portion 19c, while the lower flange 19f (flange) projects from the vehicle width direction outer end of the bottom wall portion 19d to the vehicle lower side. ing. Then, the upper flange 21e and the lower flange 21f are joined to the upper flange 19e and the lower flange 19f from the outside in the vehicle width direction by welding or the like, respectively.

  As shown in FIG. 4, a tie-down hole 23 in which a tie-down hook (not shown) is locked is formed at a position corresponding to the front end of the rear floor panel 7b of the bottom wall portion 19d. The tie-down hole 23 is a long hole that is long in the vehicle front-rear direction. A reinforcing bracket 25 that reinforces the periphery of the tie-down hole 23 is provided at a position corresponding to the tie-down hole 23 in the recess 19a.

  FIG. 6 is a view of the vehicle body lower structure when the frame side outer panel 5 and the side sill outer 21 are removed as viewed from the right side of the vehicle. FIG. 7 is a view showing the reinforcing bracket 25, wherein (a) is a plan view, (b) is a front view, and (c) is a side view.

  The reinforcing bracket 25 is formed by bending a single steel plate, and has a substantially rectangular plate-like bracket body 27 joined by welding or the like to the tie-down hole 23 corresponding to the bottom wall portion 19d. A vertical plate portion 29 (upper joint portion) that rises upward from the vehicle width direction inner end of the bracket body 27 and is joined to the vertical wall portion 19b by welding or the like, and downward from the vehicle width direction outer end of the bracket body 27 A bracket flange 31 (lower joint) that is joined to the lower flange 19f by welding or the like from the outside in the vehicle width direction, and rises upward from both ends of the bracket main body 27 in the vehicle front-rear direction. And a pair of partition walls 33 and 35 (partition members) for partitioning in the front-rear direction.

  The bracket body 27 is provided over the entire width direction of the bottom wall portion 19d, and a through hole 27a having substantially the same shape as the tie-down hole 23 is formed from the center in the vehicle front-rear direction to the front end portion. ing. Note that a corner of the bracket main body 27 at the front of the vehicle and in the vehicle width direction is cut out.

  The vertical plate portion 29 has a substantially trapezoidal plate shape, and the vehicle rear side portion is inclined forward of the vehicle toward the vehicle upper side.

  The bracket flange 31 has a rectangular plate shape and has substantially the same vertical width as the lower flange 19 f of the side sill inner 19.

  Of the pair of partition walls 33, 35, a rear partition wall 35 (hereinafter referred to as a rear partition wall 35) has a substantially rectangular plate shape and extends from the bracket body 27 to the upper wall portion 19c above the vehicle. It extends.

  At the upper end of the rear partition wall 35, a substantially rectangular plate-like upper joint piece 35a (joint piece) elongated in the vehicle width direction and joined to the upper wall portion 19c by welding or the like is formed. Further, at the inner end in the vehicle width direction of the rear partition wall 35, three inner joining pieces 35b, 35b, 35b joined to the vertical wall portion 19b by welding or the like are formed at intervals in the vehicle vertical direction. ing. The upper joint piece 35a extends from the upper end of the rear partition wall 35 so as to incline upward toward the rear of the vehicle. On the other hand, the inner joint pieces 35b, 35b, 35b are bent substantially vertically from the inner end in the vehicle width direction of the rear partition wall 35 to the rear of the vehicle. The inner joining pieces 35b, 35b, 35b have substantially the same protruding dimensions.

  The rear partition wall 35 is formed with a substantially U-shaped rib 37 that opens outward in the vehicle width direction. In FIG. 7B, only the upper end portion of the rib 37 is shown.

  On the other hand, of the pair of partition walls 33, 35, the front partition wall 33 (hereinafter referred to as the front partition wall 33) has a substantially trapezoidal plate shape as shown in FIG. The vertical width increases toward the upper side of the vehicle from the bracket body 27 to the upper wall portion 19c. Note that the lower end of the front partition wall 33 and the corner on the inner side in the vehicle width direction are cut out.

  At the upper end of the front partition wall 33, a pair of upper joint pieces 33a, 33a (joint pieces) joined to the upper wall portion 19c by welding or the like are formed at intervals in the vehicle width direction. A pair of inner joining pieces 33b and 33b joined to the vertical wall portion 19b by welding or the like are formed at the inner end in the vehicle width direction of the front partition wall 33 with an interval in the vehicle vertical direction. The upper joint pieces 33a and 33a and the inner joint pieces 33b and 33b are bent substantially vertically from the end of the front partition wall 33 toward the front of the vehicle. As shown in FIG. 7A, the pair of upper joining pieces 33a and 33a have substantially the same protruding dimensions. On the other hand, as shown in FIGS. 6 and 7C, the upper inner joint piece 33b of the pair of inner joint pieces 33b and 33b protrudes forward of the vehicle from the lower inner joint piece 33b. Yes.

  Further, as shown in FIG. 7B, a substantially U-shaped rib 39 that opens outward in the vehicle width direction is formed in the front partition wall 33. The rib 39 is formed by recessing a part of the front partition wall 33 toward the rear of the vehicle, and an upper rib 39a extending in the vehicle width direction along the upper end of the front partition wall 33 in order from the upper side, The upper rib 39a includes a vertical rib 39b extending downward from the inner end in the vehicle width direction, and a lower rib 39c extending downwardly from the lower end of the vertical rib 39b toward the outer side in the vehicle width direction. . The upper rib 39a extends in the vehicle width direction toward the upper inner joint piece 35b, while the lower rib 39c extends in the vehicle width direction toward the lower inner joint piece 35b. ing.

  FIG. 8 is a view showing a positional relationship between the reinforcing bracket 25 and the floor panel 7 and the cross member 17. In addition, in FIG. 8, the said reinforcement bracket 25 is shown with the virtual line.

  The cross member 17 is inclined upward toward the rear of the vehicle behind the kick-up portion 7c. The front partition wall 33 of the reinforcing bracket 25 is located outside the cross member 17 in the vehicle width direction. The inner joint piece 33b on the upper side of the front partition wall 33 is joined to the center of the cross member 17 in the vehicle vertical direction on the inner peripheral surface of the vertical wall portion 19b of the side sill inner 19.

  When a collision load acts on the frame side outer panel 5 and the side sill outer 21 at the time of a vehicle-side collision, the front side partition wall 33 and the rear side partition wall 35 that partition the concave portion 19a in the vehicle front-rear direction are received. Therefore, deformation of the side sill 3 can be suppressed.

  Next, the collision load acting on the front partition wall 33 is mainly transmitted through the upper rib 39a and the lower rib 39c extending in the vehicle width direction of the rib 39, and converges on the vertical rib 39b, and the pair of upper and lower parts It acts on the inner joining pieces 33b and 33b. The collision load acts on the vertical wall portion 19b of the side sill inner 19 through the inner joint piece 33b, and acts on the cross member 17 located on the inner side in the vehicle width direction.

  Thus, the transmission path of the collision load at the time of the vehicle side collision, that is, the load path is connected to the cross member 17 having a relatively high rigidity. Accordingly, it is possible to suppress deformation of the vehicle body lower structure.

  Further, since the collision load is efficiently transmitted to the inside in the vehicle width direction by the rib 39 formed on the front partition wall 33, the deformation of the side sill 3 can be further suppressed.

  On the other hand, as shown in FIG. 4, a jack-up portion 41 where the vehicle 1 is supported by a jack (not shown) at a portion corresponding to the cross member 17 of the side sill 3, that is, a portion adjacent to the front side of the tie-down hook. Is formed.

  As shown in FIG. 6, a portion of the bottom wall portion 19d of the side sill inner 19 corresponding to the jack-up portion 41 is recessed downward with a curved surface 43 from the general surface of the upper surface of the bottom wall portion 19d. Due to the curved surface 43, the portion corresponding to the jack-up portion 41 of the lower flange 19f of the side sill inner 19 has a narrow vertical width. Therefore, the narrow portion has higher rigidity than the other portions of the lower flange 19f. Therefore, the narrow portion is supported by the jack. Thus, the jack-up portion 41 is formed by the narrow portion of the lower flange 19f.

  In the portion corresponding to the jack-up portion 41 of the bottom wall portion 19d, a bead portion 45 projecting upward from the curved surface 43 to substantially the same height as the general surface of the bottom wall portion 19d extends linearly in the vehicle width direction. It is formed as follows. By forming the bead portion 45 in this way, the rigidity of the jack-up portion 41 is further increased.

  As shown in FIG. 6, the front partition wall 33 of the reinforcing bracket 25 includes the bracket body 27, the end of the jack-up portion 41 on the side opposite to the bracket body 27, that is, the vehicle front side end of the curved surface 43. Between the two. In this way, the tie-down hole 23 is formed adjacent to the jack-up portion 41, and the peripheral portion of the tie-down hole 23 with low rigidity is reinforced by the bracket body 27 of the reinforcing bracket 25. Furthermore, by arranging the front partition wall 33 which is also a part of the reinforcing bracket 25, further reinforcement of the peripheral portion of the tie-down hole 23 and reinforcement of the jack-up portion 41 are possible.

-Effects of the embodiment of the invention-
According to the above embodiment, the reinforcing bracket 25 is joined to the bottom wall portion 19d of the side sill inner 19 to reinforce the peripheral portion of the tie-down hole 23, and the bracket body 27 has an outer end in the vehicle width direction. And a vertical plate portion 29 extending upward from the bracket main body 27. That is, the reinforcing bracket 25 has a crank shape when viewed from the vehicle front-rear direction and has a high section modulus. Therefore, the reinforcing bracket 25 not only reinforces the periphery of the tie-down hole 23 with the bracket body 27 but can also contribute to securing both the rigidity against torsion and the rigidity against side collision with respect to the side sill 3.

  Further, according to the embodiment, the vertical plate portion 29 of the reinforcing bracket 25 is joined to the vertical wall portion 19 b of the side sill inner 19. Therefore, when a tie-down hook is locked on the bracket body 27 around the tie-down hole 23 and a downward tensile load acts on the bracket body 27, a part of the tensile load passes through the vertical plate portion 29. It acts on the vertical wall portion 19b of the side sill inner 19 to suppress the bracket body 27 from being pulled downward. As a result, the deformation of the bracket body 27 is suppressed. Therefore, the rigidity of the side sill 3 can be further improved.

  Further, according to the embodiment, the bracket flange 31 of the reinforcing bracket 25 is joined to the lower flange 19 f of the side sill inner 19. Therefore, when the tie-down hook is locked on the bracket body 27 around the tie-down hole 23 and a downward tensile load acts on the bracket body 27, the tensile load acts on the reinforcing bracket 25, but the side sill inner 19 does not act on the lower flange 19f. Therefore, it is possible to prevent the side sill inner 19 from being peeled from the side sill outer 21.

  Moreover, according to the said embodiment, the bracket main body 27 on the bottom wall part 19d of the side sill inner 19 is joined to the upper wall part 19c via the partition walls 33 and 35 and these upper side joining pieces 33a and 35a. Therefore, when the tie-down hook is locked on the bracket body 27 around the tie-down hole 23 and a downward tensile load acts on the bracket body 27, a part of the tensile load is divided into the partition walls 33 and 35 and the upper side. It acts on the upper wall part 19c via the joining pieces 33a and 35a, and suppresses the bracket body 27 from being pulled downward. As a result, the deformation of the bracket body 27 is suppressed. Therefore, the rigidity of the side sill 3 can be further improved.

  Furthermore, according to the above embodiment, the partition walls 33 and 35 are provided on both the front and rear sides of the bracket body 27 in the vehicle. Accordingly, when the tie-down belt extending from the tie-down hook mainly extends forward and backward when the vehicle is fixed, the tensile load acts on the vehicle rear side and the front side in the vicinity of the tie-down hole 23. Even in this case, part of the tensile load acts on the upper wall portion 19c via the front partition wall 33 and the rear partition wall 35, and the bracket body 27 is prevented from being pulled downward.

(Modification)
FIG. 9 is a view corresponding to FIG. 6 illustrating a vehicle body lower part structure according to a modification of the embodiment.

  The reinforcing bracket 47 according to this modified example is different from the above embodiment in that it has an extension portion 49 extending from the bracket body 27 to the bead portion 45 in front of the vehicle. Since other configurations are substantially the same as those of the above-described embodiment, the description thereof is omitted here.

  The extension 49 extends from the front end of the bracket body 27 to the front of the vehicle to the protruding end of the bead portion 45. The extension 49 is joined to the protruding end by welding or the like.

  Thus, the reinforcement bracket 25 and the bead part 45 are joined. Therefore, the jack-up portion 41 is reinforced by the reinforcing bracket 25 and the reinforcing bracket 25 is reinforced by the bead portion 45. Accordingly, the rigidity around the tie-down hole 23 is further increased, and the rigidity of the jack-up portion 41 is further increased.

  As described above, the vehicle body lower part structure of the vehicle according to the present invention can be applied not only to reinforcement of the side sill tie-down hole peripheral portion but also to applications that contribute to securing rigidity required for the side sill.

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Side sill 7 Floor panel 7a Front floor panel 7b Rear floor panel 7c Kick-up part 9 Rear side frame 17 Cross member 19 Side sill inner 19a Recessed part 19b Vertical wall part 19c Upper wall part 19d Bottom wall part 19f Lower flange (flange)
21 Side sill outer 23 Tie down hole 25 Reinforcement bracket 27 Bracket body 29 Vertical plate (upper joint)
31 Bracket flange (lower joint)
33 Front partition wall (partition member)
33a Upper joint piece (joint piece)
35 Rear partition wall (partition member)
35a Upper joint piece (joint piece)
47 Reinforcement bracket

Claims (3)

A boundary between the front floor panel of the floor panel and the rear floor panel at the rear of the vehicle. The part is formed with a kick-up portion that is stepped up at the rear of the vehicle, and a pair of rear side frames are provided below the rear floor panel at both ends in the vehicle width direction and inside the pair of side sills in the vehicle width direction. In the vehicle body lower part structure of the vehicle that extends in the front-rear direction and is connected to the inner side in the vehicle width direction of each side sill at the rear side of the kick-up part and the front end part of each rear side frame,
Each side sill has a side sill inner joined to the front end portion of the rear side frame, and a side sill outer joined to the side sill inner from the vehicle width direction outside,
The side sill inner is formed with a recess that opens outward in the vehicle width direction and extends in the vehicle longitudinal direction.
The side sill inner is joined to the front end of the rear side frame and forms a bottom of the recess, an upper wall extending from the upper end of the vertical wall to the vehicle width direction, and a lower end of the vertical wall. A bottom wall portion that extends outward in the vehicle width direction, and a flange that projects downward from the bottom wall portion and to which the side sill outer is joined,
The bottom wall portion is located below the lower end of the rear side frame, and has a tie-down hole in which a tie-down hook is locked.
The recess is provided with a reinforcing bracket that reinforces the periphery of the tie-down hole,
The reinforcing bracket is joined to a peripheral portion of the tie-down hole on the bottom wall portion to reinforce the peripheral portion of the tie-down hole, and a lower side extending downward from the bracket main body and joined to the flange A vehicle body lower part structure for a vehicle, comprising: a joint portion; and an upper joint portion that extends upward from the bracket body and is joined to the vertical wall portion. The vehicle body lower part structure according to claim 1,
The bracket body is provided with a partition member that extends upward to the upper wall portion and partitions the inside of the recess in the vehicle front-rear direction.
A vehicle body lower part structure for a vehicle, wherein a joining piece joined to the upper wall portion is formed on the partition member. The vehicle body lower part structure according to claim 2,
A vehicle body lower part structure for a vehicle, wherein a pair of the partition members are provided on both sides of the bracket body in the vehicle longitudinal direction.

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