Patent Publication Number: US-2023144276-A1

Title: Vehicle lower structure

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2021-182839 filed on Nov. 9, 2021, the disclosure of which is incorporated by reference herein. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a vehicle lower structure. 
     Related Art 
     Japanese Patent Application Laid-open No. 2019-116112 discloses a technique relating to a vehicle installed with a slope device. In brief, in this conventional technique, a floor panel at a vehicle upper side of a base frame is disposed so as to be spaced apart from the base frame, and a slope device capable of extending a slope plate toward a sidewalk or a road is installed in a gap between the base frame and the floor panel. 
     However, in this kind of conventional technique, if a load acting on the floor panel is directly transmitted to the slope device, operation of the slope device may become unstable, and there is room for improvement in this respect. 
     SUMMARY 
     In consideration of the above-described circumstances, an object of the present disclosure is to provide a vehicle lower structure capable of stabilizing the operation of a slope device by preventing or suppressing a load acting on the vehicle floor from being directly transmitted to a slope device. 
     A vehicle lower structure of a first aspect of the present disclosure includes: a base member provided under a floor of a vehicle; a pair of reinforcement members provided at a vehicle upper side, and at respective sides in a vehicle front-rear direction, of the base member, the pair of reinforcement members being disposed with a longitudinal direction thereof along a vehicle width direction, and each of the pair of reinforcement members being configured in a hat shape with a cross section that is open toward the vehicle upper side as viewed from the longitudinal direction, with both end parts of the hat shape in a front-rear direction of the vehicle being configured as a flange; a slope device accommodated above the base member and between the pair of reinforcement members, the slope device being configured to extend a slope plate outward from a side of the vehicle; and a vehicle body floor supported from a vehicle lower side by the pair of reinforcement members and configuring a floor surface of a vehicle cabin, and disposed at an interval toward the vehicle upper side relative to the slope device, both the slope device and the vehicle body floor being fastened to each of a rear flange of a front reinforcement member and a front flange of a rear reinforcement member of respective pairs of the flanges of each of the pair of reinforcement members, and a position at which the slope device is fastened and a position at which the vehicle body floor is fastened being configured at different positions, and a first fastening portion at which the slope device is fastened to the rear flange of the front reinforcement member and to the front flange of the rear reinforcement member being disposed so as not to contact the vehicle body floor, and a second fastening portion at which the vehicle body floor is fastened to the rear flange of the front reinforcement member and to the front flange of the rear reinforcement member being disposed so as not to contact the slope device. 
     According to the above-described configuration, a base member is provided below the floor of a vehicle, and a pair of reinforcement members are provided at a vehicle upper side, and at respective sides in the vehicle front-rear direction, of the base member, and are disposed with the vehicle width direction as their longitudinal direction. The reinforcement members are formed in a hat shape with a cross section that is open toward the vehicle upper side as viewed from the longitudinal direction, and both end parts thereof in a front-rear direction of the vehicle are configured as flanges. A slope device is accommodated at the vehicle upper side of the base member and between the pair of reinforcement members, and the slope device is capable of extending a slope plate outward from a side of the vehicle. Moreover, the pair of reinforcement members support a vehicle body floor, configuring the floor surface of the vehicle cabin, from a vehicle lower side, and the vehicle body floor is disposed at an interval at the vehicle upper side with respect to the slope device. 
     Here, both the slope device and the vehicle body floor are fastened to each of the rear flange of the front reinforcement member and the front flange of the rear reinforcement member of respective pairs of flanges of the pair of reinforcement members, and the position at which the slope device is fastened and the position at which the vehicle body floor is fastened are configured at different positions from each other. Moreover, a first fastening portion of the slope device to the rear flange of the front reinforcement member, and to the front flange of the rear reinforcement member, is arranged so as not to contact the vehicle body floor, and a second fastening portion of the vehicle body floor to the rear flange of the front reinforcement member, and to the front flange of the rear reinforcement member, is disposed so as not to contact the slope device. As a result, since direct transmission of a load acting on the vehicle floor to the slope device is prevented or suppressed, operation of the slope device can be stabilized. 
     A vehicle lower structure of a second aspect of the present disclosure is the configuration of the first aspect, in which the rear flange of the front reinforcement member is configured with a height position at a lower position in a vehicle vertical direction than a front flange of the front reinforcement member, and the front flange of the rear reinforcement member is configured with a height position at a lower position in the vehicle vertical direction than a rear flange of the rear reinforcement member. 
     According to the above-described configuration, a configuration in which first fastening portions of the slope device to the rear flange of the front reinforcement member, and to the front flange of the rear reinforcement member, do not contact the vehicle body floor can be implemented without providing a non-contact structure on a lower surface side of the vehicle body floor. 
     A vehicle lower structure of a third aspect of the present disclosure is the configuration of the first or second aspect, in which the base member includes a battery case configured to accommodate a battery. 
     According to the above-described configuration, in a vehicle provided with a battery case under the floor of the vehicle, a load acting on the vehicle body floor can be prevented or suppressed from being directly transmitted to a slope device disposed between the battery case and the vehicle body floor. 
     As described above, according to the vehicle lower structure of the present disclosure, by preventing or suppressing a load acting on the vehicle floor from being directly transmitted to a slope device, an effect of enabling operation of the slope device to be stabilized is achieved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments of the present disclosure will be described in detail based on the following figures, wherein: 
         FIG.  1    is a perspective view illustrating a vehicle to which a vehicle lower structure according to an exemplary embodiment of the present disclosure has been applied; 
         FIG.  2    is an enlarged, simplified cross-sectional view of a section taken along line  2 - 2  of  FIG.  1   ; 
         FIG.  3    is an exploded perspective view illustrating a simplified exploded view of a portion of the lower part of the vehicle of  FIG.  1   ; 
         FIG.  4    is a simplified plan view illustrating a state in which the vehicle body floor is removed from the lower part of the vehicle illustrated in  FIG.  1    to an extent corresponding to the illustration of  FIG.  3   , as viewed from a vehicle upper side; 
         FIG.  5    is an enlarged cross-sectional view illustrating a state in which a lower part of the vehicle of  FIG.  1    is cut at a position corresponding to line  5 - 5  of  FIG.  4   ; and 
         FIG.  6    is an enlarged cross-sectional view illustrating a state in which a lower part of the vehicle of  FIG.  1    is cut at a position corresponding to line  6 - 6  of  FIG.  4   . 
     
    
    
     DETAILED DESCRIPTION 
     Explanation follows regarding a vehicle lower structure according to an exemplary embodiment of the present disclosure, with reference to  FIG.  1    to  FIG.  6   . In these drawings, the arrow FR illustrated as appropriate indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow LH indicates the left side of the vehicle. 
     Configuration of Exemplary Embodiment 
     In  FIG.  1   , a vehicle  10 , to which a vehicle lower structure according to an exemplary embodiment of the present disclosure has been applied, is illustrated in perspective view. Here, the vehicle  10  illustrated in  FIG.  1    is, for example, an electric vehicle that travels by autonomous driving, and is also capable of traveling by remote control. Vehicle drive units  18  are provided at both sides in the vehicle width direction at the front side and the rear side of the vehicle  10 , and an in-wheel motor (not illustrated), for example, is incorporated in the vehicle drive unit  18 . 
     As illustrated in  FIG.  1   , a door opening  14  is formed at an intermediate portion in a front-rear direction of the vehicle  10  at a left side portion  12  of the vehicle  10 . The door opening  14  communicates the exterior of the vehicle cabin with the interior of the vehicle cabin, and is opened and closed by a pair of doors  16 ,  17 . The pair of doors  16 ,  17  are slide doors that slide along the front-rear direction of the vehicle. 
     An electric slope device  20  is installed at a lower part of the vehicle  10 . The slope device  20  is configured so as to be able to extend a slope plate  20 A from a lower edge side of the door opening  14  outward from the side of the vehicle. The slope device  20  includes the slope plate  20 A, a pair of front and rear rails  20 B (see  FIG.  3   ) for guiding movement of the slope plate  20 A, and a drive motor (not illustrated) for moving the slope plate  20 A, and a jamming protection function is provided. The jamming protection function is a function for stopping movement of the slope plate  20 A during a time of abnormality, such as in a case in which the slope plate  20 A contacts a person or the like during deployment of the slope plate  20 A. Since the basic configuration of the slope device  20  is well-known, detailed explanation thereof is omitted. Further, the slope plate  20 A may be configured from a single piece or plural pieces. 
     In  FIG.  2   , an enlarged, simplified cross-sectional view of a section taken along line  2 - 2  of  FIG.  1    is shown. In  FIG.  2   , the slope device  20  described above is illustrated as a single element for the sake of convenience. As illustrated in  FIG.  2   , a battery case  24  functioning as a base member is provided below the floor of the vehicle  10 . The battery case  24  is a case body that accommodates a battery  22 . As an example, the battery case  24  includes an upper case  24 A configuring an upper portion thereof, and a lower case  24 B disposed below the upper case  24 A and forming an internal space together with the upper case  24 A, and the upper case  24 A and the lower case  24 B are joined together. The battery case  24  is fixed to vehicle body component members (not shown). 
     Reinforcements  32 ,  34 , functioning as a pair of iron (steel) strength members, are provided at a vehicle upper side, and on both sides in the vehicle front-rear direction, of the battery case  24 . The pair of reinforcements  32 ,  34  are disposed with the vehicle width direction serving as a longitudinal direction thereof (see  FIG.  3   ). Each of the pair of reinforcements  32 ,  34  may be configured by a single member, or may be configured as an integrated body by joining plural members connected in a longitudinal direction. The pair of reinforcements  32 ,  34  configure a portion of a body frame part  30 . The body frame part  30  includes an iron (steel) reinforcement  36  disposed at a vehicle rear side of the pair of reinforcements  32 ,  34  with the vehicle width direction as a longitudinal direction. 
     In the following explanation, among the pair of reinforcements  32 ,  34 , the reinforcement (front strength member) at the front side in the vehicle front-rear direction is referred to as the front reinforcement  32 . The reinforcement (rear strength member) at the rear side among the pair of reinforcements  32 ,  34  in the vehicle front-rear direction is referred to as the rear reinforcement  34 . In a case in which explanation is made collectively without distinguishing between the front reinforcement  32  and the rear reinforcement  34 , these are referred to as a pair of reinforcements  32 ,  34 . 
     The pair of reinforcements  32 ,  34  are formed in a hat shape with a cross section that is opened at a vehicle upper side as viewed along a longitudinal direction, and respective end parts in the vehicle front-rear direction are configured by flanges  32 A,  32 B,  34 A,  34 B. In the following explanation, among the flanges  32 A,  32 B of the front reinforcement  32 , the flange at the front side in the vehicle front-rear direction is referred to as a front flange  32 A, and the rearward flange of the flanges  32 A,  32 B of the front reinforcement  32  in the vehicle front-rear direction is referred to as a rear flange  32 B. Similarly, of the flanges  34 A,  34 B of the rear reinforcement  34 , the flange on the front side in the vehicle front-rear direction is referred to as a front flange  34 A, and the rearward flange of the flanges  34 A,  34 B of the rear reinforcement  34  in the vehicle front-rear direction is referred to as a rear flange  34 B. 
     In  FIG.  3   , an exploded perspective view is shown of a simplified exploded view of a portion of a lower part of the vehicle  10  of  FIG.  1   . As illustrated in  FIG.  2    and  FIG.  3   , the front flange  32 A of the front reinforcement  32  and the rear flange  34 B of the rear reinforcement  34  are joined to the underside of a panel body  38  of the iron (steel) body frame part  30 . 
     As illustrated in  FIG.  3   , the panel body  38  includes plural panel materials  38 A,  38 B,  38 C. Adjacent portions of the plural panel members  38 A,  38 B,  38 C are joined together. At the panel body  38 , a substantially rectangular penetration part  38 H is formed that penetrates in a vehicle vertical direction, and this penetrating part  38 H is open at the left side of the vehicle in a plan view of the vehicle. The front flange  32 A of the front reinforcement  32  is joined to a forward portion of the peripheral edge of the penetration part  38 H, and the rear flange  34 B of the rear reinforcement  34  is joined to a rearward portion of the peripheral edge of the penetration part  38 H. While not illustrated in  FIG.  3   , as illustrated in  FIG.  2   , a reinforcement  36  disposed further toward the vehicle rear side than the rear reinforcement  34  is also joined to the panel body  38 . 
     The rear flange  32 B of the front reinforcement  32  is configured at a position of lower height in the vehicle vertical direction than the front flange  32 A of the front reinforcement  32 . The front flange  34 A of the rear reinforcement  34  is configured at a position of lower height in the vehicle vertical direction than the rear flange  34 B of the rear reinforcement  34 . The joining of the rear flange  32 B of the front reinforcement  32  with another member, and the joining of the front flange  34 A of the rear reinforcement  34  with another member, will be described below. 
     The slope device  20  described above is housed at a vehicle upper side of the battery case  24  and between the pair of reinforcements  32 ,  34 . The pair of reinforcements  32 ,  34  support the vehicle body floor  40  configuring the floor surface of the vehicle cabin  10 X from below the vehicle. Here,  FIG.  2    schematically illustrates an equivalent distributed load, acting in a case in which a large number of occupants are standing on the vehicle body floor  40 , with an arrow F. The rear flange  32 B of the front reinforcement  32  and the front flange  34 A of the rear reinforcement  34  are spaced apart from the bottom surface of the vehicle body floor  40  toward a lower side of the vehicle. The vehicle body floor  40  is disposed at an interval at the vehicle upper side with respect to the slope device  20 . Here, in the case of a state in which the vehicle body floor  40  has been removed, the slope device  20  is detachable. 
     As illustrated in  FIG.  3   , the vehicle body floor  40  is configured by plural floor component members  40 A, as an example. The floor component  40 A is an extruded material made of an aluminum alloy, is hollow (see  FIG.  5    and  FIG.  6   ), and is formed in an elongated rectangular shape in plan view. The extrusion direction at the time of molding of the floor component  40 A is the same direction as the longitudinal direction of the floor component  40 A. In addition, in  FIG.  2    and  FIG.  3   , illustration of a hollow part of the hollow floor component  40 A is omitted in order to simplify the drawings. As illustrated in  FIG.  3   , the plural floor components  40 A are each disposed with the vehicle front-rear direction as their longitudinal direction, and are joined to the body frame part  30  so as to occlude the penetration part  38 H of the panel body  38  while being juxtaposed in the vehicle width direction. The plural floor component members  40 A are detachable from the body frame part  30 . 
     In  FIG.  4   , a simplified plan view is shown of a state in which the vehicle body floor  40  is removed from the lower part of the vehicle  10  illustrated in  FIG.  1    to an extent corresponding to the illustration of  FIG.  3   , as viewed from a vehicle upper side. In  FIG.  4   , the outline of the vehicle body floor  40  in a case in which the vehicle body floor  40  is in place is illustrated in a simplified manner by a two-dot chain line, and the slope device  20  is illustrated as a single element for simplicity. Moreover, reference numerals  32 Y,  32 Z,  34 Y,  34 Z,  38 Z are assigned to positions at which the vehicle body floor  40  is fastened at the body frame part  30 , and reference numerals  32 X,  34 X are assigned to positions at which the slope device  20  is fastened at the body frame part  30 . To explain further, the circles marked with the reference numerals  32 X,  32 Y,  32 Z,  34 X,  34 Y,  34 Z,  38 Z in  FIG.  4    can be regarded as positions at which fasteners are disposed when viewed from a vehicle upper side. 
     Further, in  FIG.  5   , a cross-sectional view is shown of a state in which the lower part of the vehicle  10  of  FIG.  1    is cut at a position corresponding to line  5 - 5  in  FIG.  4    and enlarged, and in  FIG.  6   , a cross-sectional view is shown of a state in which the lower part of the vehicle  10  of  FIG.  1    is cut at a position corresponding to line  6 - 6  in  FIG.  4    and enlarged.  FIG.  5    and  FIG.  6    illustrate the slope device  20  in a simplified state and, for example, a movable body  20 M is illustrated in a state in which it is integrated with the slope plate  20 A and a member attached to a front end side thereof in the vehicle front-rear direction for the sake of convenience. Further, a member (not illustrated) such as a pulley is disposed between the moving body  20 M and the rail  20 B. Incidentally, side guards  20 C are provided at upper portions of both end sides of the movable body  20 M in the vehicle front-rear direction, and these side guards  20 C are arranged in a vertical wall shape by rotation thereof 90 degrees around a vehicle width direction axis during use of the slope device  20 . 
     As illustrated in  FIG.  4    to  FIG.  6   , both the slope device  20  and the vehicle body floor  40  are fastened to each of the rear flange  32 B of the front reinforcement  32  and the front flange  34 A of the rear reinforcement  34 , and the positions  32 X,  34 X (see  FIG.  4   ) at which the slope device  20  is fastened and the positions  32 Y,  34 Y (see  FIG.  4   ) at which the vehicle body floor  40  is fastened are configured at different positions from each other. Hereinafter, explanation follows regarding these configurations and their peripheral configurations. 
     As illustrated in  FIG.  4   , from a front end side of the slope device  20  in the vehicle front-rear direction, plural front side projections  20 F project toward a front side of the vehicle. Plural rear side projections  20 R project toward a rear side of the vehicle from a rear end side of the slope device  20  in the vehicle front-rear direction. As an example, the front side projections  20 F and the rear side projections  20 R are configured at portions near respective ends in the vehicle width direction at front and rear end sides of the slope device  20  and at an intermediate portion in the vehicle width direction at front and rear end sides of the slope device  20 . 
     As illustrated in  FIG.  4    and  FIG.  5   , the front side projections  20 F of the slope device  20  are overlaid from the vehicle upper side and fastened to the rear flange  32 B of the front reinforcement  32 . As illustrated in  FIG.  5   , a bolt insertion hole  20 F 1  is formed through the front side projection  20 F. A bolt insertion hole  32 B 1  is formed in a position corresponding to the bolt insertion hole  20 F 1  in the rear flange  32 B of the front reinforcement  32  through the rear flange  32 B. A weld nut  48  is fixed in advance to an outer peripheral portion of the bolt insertion hole  32 B 1  at a lower surface of the rear flange  32 B of the front reinforcement  32 . A shaft  49 A of a bolt  49  that penetrates the bolt insertion holes  20 F 1 ,  32 B 1  from a vehicle upper side, is screwed into the weld nut  48 . As a result, the front side projection  20 F of the slope device  20  and the rear flange  32 B of the front reinforcement  32  are sandwiched and fastened between a head section  49 B of the bolt  49  and the weld nut  48 . A space is provided between the head portion  49 B of the bolt  49  and the lower surface of the vehicle body floor  40 . 
     As illustrated in  FIG.  4   , the rear side projections  20 R of the slope device  20  are overlaid from the vehicle upper side and fastened to the front flange  34 A of the rear reinforcement  34 . The fastening configuration between the rear side projection  20 R of the slope device  20  and the front flange  34 A of the rear reinforcement  34  is substantially the same as the fastening configuration between the front side projection  20 F of the slope device  20  and the rear flange  32 B of the front reinforcement  32  illustrated in  FIG.  5   , inverted in the front-rear direction. As described above, the first fastening portion  50  of the slope device  20  to the rear flange  32 B of the front reinforcement  32 , and to the front flange  34 A of the rear reinforcement  34 , illustrated in  FIG.  4    (refer to  FIG.  5   ; a cross-sectional view of a fastening portion between the slope device  20  and the front flange  34 A of the rear reinforcement  34  is not illustrated) is disposed so as not to contact the vehicle body floor  40  illustrated in  FIG.  5   . 
     As illustrated in  FIG.  4    and  FIG.  6   , the front portion of the vehicle body floor  40  in the vehicle front-rear direction is fastened to the front flange  32 A and the rear flange  32 B of the front reinforcement  32 . 
     As illustrated in  FIG.  6   , a bolt insertion hole  32 A 1  is formed through the front flange  32 A of the front reinforcement  32 . A weld nut  46  is fixed in advance to an outer peripheral portion of the bolt insertion hole  32 A 1  at a lower surface of the front flange  32 A of the front reinforcement  32 . A bolt insertion hole  38 D 1  is formed through an overlapping portion  38 D of the panel body  38  that overlaps with the front flange  32 A of the front reinforcement  32 . Moreover, a bolt insertion hole  40 L 1  is formed through a lower wall  40 L of the vehicle body floor  40  at a position corresponding to the bolt insertion hole  38 D 1 . A work hole  40 U 1  with a larger diameter than the bolt insertion hole  40 L 1  is formed through an upper wall  40 U of the vehicle body floor  40  at a vehicle upper side of the bolt insertion hole  40 L 1 . The work hole  40 U 1  is dimensioned so as to allow a bolt  47  to pass therethrough. A shaft  47 A of the bolt  47  penetrates the bolt insertion holes  40 L 1 ,  38 D 1 ,  32 A 1  from the vehicle upper side and is screwed into the weld nut  46 . As a result, the lower wall  40 L of the vehicle body floor  40 , the overlapping portion  38 D of the panel body  38 , and the front flange  32 A of the front reinforcement  32  are sandwiched and fastened between a head section  47 B of the bolt  47  and the weld nut  46 . 
     Further, a bolt insertion hole  32 B 2  is formed through the rear flange  32 B of the front reinforcement  32 . A weld nut  44  is fixed in advance to an outer peripheral portion of the bolt insertion hole  32 B 2  at a lower surface of the rear flange  32 B of the front reinforcement  32 . A metallic cylindrical collar  42  is interposed coaxially with the weld nut  44  between the rear flange  32 B of the front reinforcement  32  and the lower wall  40 L of the vehicle body floor  40 . As an example, the collar  42  is fixed in advance to the rear flange  32 B of the front reinforcement  32 . 
     A bolt insertion hole  40 L 2  is formed in the lower wall  40 L of the vehicle body floor  40  at a position corresponding to the bolt insertion hole  32 B 2  in the rear flange  32 B of the front reinforcement  32 . A work hole  40 U 2  with a larger diameter than the bolt insertion hole  40 L 2  is formed through the upper wall  40 U of the vehicle body floor  40  at a vehicle upper side of the bolt insertion hole  40 L 2 . The working hole  40 U 2  is dimensioned so as to allow a bolt  45  to pass therethrough. A shaft  45 A of the bolt  45  penetrates the bolt insertion hole  40 L 2 , the collar  42 , and the bolt insertion hole  32 B 2  from the vehicle upper side, and is screwed into the weld nut  44 . As a result, the lower wall  40 L of the vehicle body floor  40 , the collar  42 , and the rear flange  32 B of the front reinforcement  32  are sandwiched and fastened between a head  45 B of the bolt  45  and the weld nut  44 . The weld nut  44 , the rear flange  32 B of the front reinforcement  32 , and the collar  42  are spaced apart from the front face  20 X of the slope device  20  in the vehicle front-rear direction. 
     The rear portion in the vehicle front-rear direction of the vehicle body floor  40  illustrated by the two-dot chain line in  FIG.  4   , is fastened to the front flange  34 A and the rear flange  34 B of the rear reinforcement  34 . The fastening configuration between the rear portion of the vehicle body floor  40  in the vehicle front-rear direction and the front flange  34 A and the rear flange  34 B of the rear reinforcement  34  is substantially the same as the fastening configuration between the front portion of the vehicle body floor in the vehicle front-rear direction and the front flange  32 A and the rear flange  32 B of the front reinforcement  32  illustrated in  FIG.  6   , inverted in the front-rear direction. As above, a second fastening portion  52  of the vehicle body floor  40  illustrated by the two-dot chain line in  FIG.  4    to the rear flange  32 B of the front reinforcement  32 , and to the front flange  34 A of the rear reinforcement  34  (refer to  FIG.  6   ; a cross-sectional view of the fastening portion between the vehicle body floor  40  and the front flange  34 A of the rear reinforcement  34  is not shown in the drawings) is disposed so as not to be in contact with the slope device  20 . 
     The weld nuts  44 ,  46 ,  48  and the bolts  45 ,  47 ,  49  illustrated in  FIG.  5    and  FIG.  6    are elements that are broadly understood to be fasteners. While detailed explanation is omitted, as illustrated in  FIG.  4   , as an example, an end portion of the vehicle right side of the vehicle body floor  40  illustrated by the two-dot chain line is fastened at plural positions (positions indicated by reference numeral  38 Z) to a vehicle right side portion at a peripheral edge portion of the penetration part  38 H of the panel body  38 . 
     Mechanism and Effect of Exemplary Embodiment 
     Next, explanation follows regarding the mechanism and effect of the above-described exemplary embodiment. 
     As illustrated in  FIG.  2   , the pair of reinforcements  32 ,  34  support the vehicle body floor  40  from the vehicle lower side, and the vehicle body floor  40  is disposed at an interval at the vehicle upper side with respect to the slope device  20 . As illustrated in  FIG.  4    to  FIG.  6   , both the slope device  20  and the vehicle body floor  40  are fastened to the rear flange  32 B of the front reinforcement  32  and the front flange  34 A of the rear reinforcement  34 , respectively, and the positions  32 X,  34 X (see  FIG.  4   ) at which the slope device  20  is fastened and the positions  32 Y,  34 Y (see  FIG.  4   ) at which the vehicle body floor  40  is fastened are configured at different positions from each other. Moreover, the first fastening portions  50  (see  FIG.  5   ) of the slope device  20  to the rear flange  32 B of the front reinforcement  32  and to the front flange  34 A of the rear reinforcement  34  are disposed so as not to contact the vehicle body floor  40 , and the second fastening portions  52  (see  FIG.  6   ) of the vehicle body floor  40  to the rear flange  32 B of the front reinforcement  32  and to the front flange  34 A of the rear reinforcement  34  are disposed so as not to contact the slope device  20 . This enables a load acting on the vehicle body floor  40  to be prevented or suppressed from being directly transmitted to the slope device  20 , which enables operation of the slope device  20  to be stabilized. 
     To explain further, in the configuration of the present exemplary embodiment, even in a case in which a large load acts on the vehicle body floor  40  in the vehicle vertical direction, this load is only transmitted to the slope device  20  via members such as the collar  42  and the pair of reinforcements  32 ,  34 . This prevents a large input from being directly applied to the rail  20 B (see  FIG.  5    and  FIG.  6   ) of the slope device  20 , which enables an increase in sliding resistance (occurrence of an abnormality in sliding resistance) during deployment of the slope plate  20 A to be suppressed. This enables a reduction in erroneous determination regarding an abnormality in sliding resistance during deployment of the slope plate  20 A, and it is possible to prevent or effectively suppress the occurrence of a situation in which the operation of the slope device  20  is stopped by the jamming protection function based on an erroneous determination. 
     Moreover, in the present exemplary embodiment, the rear flange  32 B of the front reinforcement  32  is set at a position that is lower in height than the front flange  32 A of the front reinforcement  32  in the vehicle vertical direction, and as illustrated in  FIG.  2   , the front flange  34 A of the rear reinforcement  34  is set at a position lower in height than the rear flange  34 B of the rear reinforcement  34  in the vehicle vertical direction. As a result, a configuration in which the first fastening portion  50  (see  FIG.  5   ) of the slope device  20  to the rear flange  32 B of the front reinforcement  32  and to the front flange  34 A of the rear reinforcement  34  do not come into contact with the vehicle body floor  40  can be implemented without providing a non-contact structure on the lower surface side of the vehicle body floor  40 . 
     As described above, according to the vehicle lower structure of the present exemplary embodiment, by preventing or suppressing a load acting on the vehicle body floor  40  from being directly transmitted to the slope device  20 , operation of the slope device  20  can be stabilized. 
     In the present exemplary embodiment, as illustrated in  FIG.  4    to  FIG.  6   , in addition to employing a configuration in which both the slope device  20  and the vehicle body floor  40  are fastened to each of the rear flange  32 B of the front reinforcement  32  and the front flange  34 A of the rear reinforcement  34 , since a configuration that prevents a load acting on the vehicle body floor  40  from being directly transmitted to the slope device  20  has been adopted, as illustrated in  FIG.  4   , the fastening pitch relative to the pair of reinforcements  32 ,  34  at the vehicle body floor  40  can be reduced. Further, by reducing the fastening pitch, even in a case in which a load acts in the vehicle vertical direction on the vehicle body floor  40  illustrated in  FIG.  2   , such as in a case in which the vehicle  10  (see  FIG.  1   ) during travel has passed over a protrusion, deflection of the vehicle body floor  40  can be reduced. As a result, direct or indirect contact of the vehicle body floor  40  with the slope device  20  and the battery case  24  can be prevented or effectively suppressed. 
     Supplementary Explanation of Exemplary Embodiments 
     As a modified example of the above-described exemplary embodiment, a configuration may be adopted in which the height positions in the vehicle vertical direction of the pair of flanges of the pair of reinforcements serving as the pair of strength members are aligned, and a non-contact concave structure is provided at a lower surface side of the vehicle body floor so as to prevent a first fastening portion of the slope device to the rear flange of the front reinforcement (front strength member) and to the front flange of the rear reinforcement (rear strength member) from contacting the vehicle body floor. 
     Although explanation has been given regarding an example of a case in which the base member is the battery case  24  in the above-described exemplary embodiment, the base member may be a base frame that accommodates a battery (for example, a base frame such as that illustrated in Japanese Patent Application Laid-open No. 2019-116112), or a base frame that does not accommodate a battery may be used. 
     As a modified example of the above-described exemplary embodiments, a bracket made of a steel plate may be provided instead of the collar  42  illustrated in  FIG.  6   . 
     As a modified example of the above-described exemplary embodiments, the vehicle body floor may be, for example, a press-molded aluminum alloy. Further, the vehicle body floor may be configured of a single member. 
     The above-described exemplary embodiments and the plural modified examples described above may be implemented in appropriate combinations. 
     Although examples of the present disclosure have been described above, the present disclosure is not limited to the foregoing description and it will be apparent that various other modifications may be implemented within a range not departing from the gist of the present disclosure.