Patent Publication Number: US-9840138-B2

Title: Vehicle vibration suppressing structure

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority under 35 USC 119 from Japanese Patent Application, No. 2015-176140 filed Sep. 7, 2015, the disclosure of which is incorporated by reference herein in its entirely. 
     BACKGROUND 
     Technical Field 
     Preferred embodiments relate to a vehicle vibration suppressing structure that suppresses vibrations in a floor pan provided at a floor panel. 
     Related Art 
     JP2013-043464A describes an invention related to a resonance preventing structure. In this resonance preventing structure, a storage box (storage section) that stores tools and the like (storage objects) is accommodated in a floor pan provided at a floor panel. Accordingly, a bottom wall portion of the floor pan is pressed by the load of the storage section and the storage objects stored therein, and vibrations can be suppressed from occurring in the floor pan. 
     However, in the case of the related art described by JP-A No. 2013-043464, when the storage section is a size not storable in the floor pan, there is no longer anything to press the bottom wall portion of the floor pan, and it becomes difficult to suppress vibrations from occurring in the floor pan. 
     SUMMARY 
     In consideration of the above circumstances, an object of preferred embodiments is to obtain a vehicle vibration suppressing structure capable of suppressing vibrations from occurring in a floor pan even when a storage section that stores storage objects has a size that is not storable in the floor pan. 
     A vehicle vibration suppressing structure of a first aspect of the disclosure includes: a floor panel configuring part of a vehicle body and including a general portion that extends in a vehicle front-rear direction and in a vehicle width direction, and a floor pan that is provided contiguously to the general portion and that is formed in a concave shape indented toward a vehicle lower side; a storage section that covers the floor pan as viewed from a vehicle upper side, that is attached to the general portion, and that is capable of storing a storage object; and a vibration suppressing section that is disposed between a lower face of the storage section and a bottom wall portion of the floor pan in a state of contact with the lower face and the bottom wall portion. 
     According to the first aspect, the floor panel configuring part of the vehicle body includes the general portion that extends in the vehicle front-rear direction and in the vehicle width direction, and the floor pan that is provided contiguously to the general portion. The floor pan is formed in a concave shape indented toward the vehicle lower side. Various members can therefore be stored inside the floor pan. 
     For example, it is conceivable to store the storage section, which is capable of storing the storage object, in the floor pan. In such a configuration, the bottom wall portion of the floor pan is pressed by the load of the storage section and the storage object stored therein, and, as a result, vibrations can be suppressed from occurring in the floor pan. However, in cases in which the storage section is a size not storable in the floor pan, there is no longer anything to press the bottom wall portion of the floor pan, and it becomes difficult to suppress vibrations from occurring in the floor pan. 
     In the first aspect, the storage section covers the floor pan and is attached to the general portion of the floor panel as viewed from the vehicle upper side. Namely, in the present invention, although the capacity of the storage section may be set larger than in cases in which the storage section is a size storable in the floor pan, it becomes difficult to directly press the bottom wall portion of the floor pan using the storage section. 
     In the first aspect, the vibration suppressing section is disposed between the lower face of the storage section and the bottom wall portion of the floor pan, in a state of contact with the lower face and the bottom wall portion. The storage section can therefore press the bottom wall portion of the floor pan through the vibration suppressing section. Note that the storage section is not limited to covering the entire floor pan; storage sections that cover a portion of the floor pan are also encompassed. 
     A vehicle vibration suppressing stricture of a second aspect of the disclosure is, in the first aspect, the floor pan further includes a surrounding wall portion that extends toward the vehicle lower side from a boundary between the floor pan and the general portion, and that configures a surrounding wall of the floor pan, and a curved wall portion that is formed contiguously to each of the surrounding wall portion and the bottom wall portion, and that is curved so as to bulge toward the outer side of the floor pan. A lower face of the vibration suppressing structure is in face contact with the curved wall portion. 
     According to the second aspect, the floor pan includes the surrounding wall portion that configures the surrounding wall of the floor pan, and the curved wall portion that is formed contiguously to each of the surrounding wall portion and the bottom wall portion. The surrounding wall portion extends toward the vehicle lower side from the boundary between the floor pan and the general portion of the floor panel, and the curved wall portion is curved so as to bulge toward the outer side of the floor pan. The curved wall portion is primarily influenced by vibrations in the vehicle up-down direction generated in the bottom wall portion, and vibrations in the vehicle front-rear direction and the vehicle width direction generated in the surrounding wall portion. 
     Thus, in the second aspect, the storage section can press the bottom wall portion and the curved wall portion of the floor pan through the vibration suppressing section since the lower face of the vibration suppressing section is in face contact with the curved wall portion of the floor pan. As a result, reaction forces can be given counter to vibrations in the floor pan in various directions. 
     A vehicle vibration suppressing structure of a third aspect of the disclosure is, in the first aspect or the second aspect, the vibration suppressing section is constituted from a resin, and plural projections are provided at an upper face of the vibration suppressing section so as to project out from the upper face, and the plural projections abut the lower face of the storage section. 
     According to the third aspect, weight can be reduced compared to cases in which the vibration suppressing section is constituted from a metal or the like since the vibration suppressing section is constituted from a resin. Moreover, contact pressure between the lower face of the storage section and the upper face of the vibration suppressing section is increased compared to cases in which the upper face is configured as a planar face, since the plural projections are provided at the upper face of the vibration suppressing section so as to project out from the upper face, and the projections abut the lower face of the storage section. As a result, in a state in which the lower face of the storage section and the upper face of the vibration suppressing section are in contact, movement of the upper face relative to the lower face is suppressed. 
     A vehicle vibration suppressing structure of a fourth aspect of the disclosure is, in any one of the first aspect to the third aspect, the stored storage object is plural battery modules that configure a vehicle mounted battery, and the storage section is a storage case that stores the battery modules. 
     According to the fourth aspect, the vehicle mounted battery is configured including the plural battery modules and the storage case that stores the battery modules. The vehicle mounted battery can therefore be employed as a power source for a hybrid car or a plugin hybrid car. 
     The bottom wall portion of the floor pan can therefore be pressed by the load of the vehicle mounted battery in cases in which the vehicle mounted battery is a size not storable in the floor pan, and, as a result, vibrations can be suppressed from occurring in the floor pan. 
     However, in cases in which the vehicle mounted battery has a large physical volume, like those employed in plugin hybrid cars, it is conceivable that it would be difficult to store the vehicle mounted battery in the floor pan, and that, as a result, it would be difficult to suppress vibrations from occurring in the floor pan. Although it is conceivable that the floor pan could be configured capable of storing vehicle mounted batteries of large physical volume, this would require modifying the configuration of the floor pan, and thus the vehicle body. 
     In the fourth aspect, the storage case, which configures the vehicle mounted battery, can press the bottom wall portion of the floor pan through the vibration suppressing section. This enables vibrations to be suppressed from occurring in the floor pan without changing shape of the floor pan, even when the vehicle mounted battery is a size not storable in the floor pan. 
     A vehicle vibration suppressing structure of the fifth aspect of the disclosure is, in any one of the first aspect to the fourth aspect, the vibration suppressing section is disposed in a position abutting a vehicle width direction central portion of the curved wall portion of the floor pan. 
     A vehicle vibration suppressing structure of a sixth aspect of the disclosure is, in any one of the second aspect to the fifth aspect, the vibration suppressing section includes a lower side abutting portion, and a pair of upper side abutting portions abutting the storage section; the lower side abutting portion includes a bottom wall region, and a curved wall portion side abutting region extending upwards from the bottom wall region; and the curved wall portion side abutting region is disposed at a position abutting a vehicle width direction central portion of a curved wall portion of the floor pan, the lower face of the curved wall portion side abutting region is in face contact with the curved wall portion of the floor pan, and the bottom wall region is mounted on the bottom wall portion of the floor pan. 
     Since large vibrations are generally liable to be generated in the vehicle width direction central portion of the curved wall portion of the floor pan, this portion is configured to abut the vibration suppressing section in the fifth aspect. In the sixth aspect, the curved wall portion side abutting region of the vibration suppressing section is configured to abut the vehicle width direction central portion of the curved wall portion of the floor pan. Such a configuration increases the effectiveness of suppressing vibrations in the floor pan using the vibration suppressing section, and enables the vibration suppressing section to be smaller in scale. 
     A vehicle vibration suppressing structure of a seventh aspect of the disclosure is, in the vehicle vibration suppressing structure of any one of the third aspect to the fifth aspect, the vibration suppressing section includes a lower side abutting portion, and a pair of upper side abutting portions abutting the storage section. The lower side abutting portion is formed in a block shape having a substantially uniform thickness in the vehicle front-rear direction and in the vehicle width direction, and the lower face of the lower side abutting portion is in face contact with the curved wall portion of the floor pan. Plural projections are provided at an upper face of the pair of upper side abutting portions so as to project out from the upper face, and horizontal dimensions of the pair of upper side abutting portions are gradually widen in the vehicle forward direction and in the vehicle width direction from respective leading end portions of the upper side abutting portions toward the lower side abutting portion. 
     According to the seventh aspect, the lower side abutting portion of the vibration suppressing section is a block shape having substantially uniform thickness in the vehicle front-rear direction and the vehicle width direction, and each of the pair of upper side abutting portions has horizontal dimensions that gradually widen in the vehicle forward direction and in the vehicle width direction from respective leading end portions of the upper side abutting portions toward the lower side abutting portion. The pressing force from the storage section therefore can be suppressed from acting unevenly on the lower face of the lower side abutting portion. 
     A vehicle vibration suppressing structure of an eighth aspect of the disclosure is, in the vehicle vibration suppressing structure of the seventh aspect, the plural projections include first plural ribs that extend along the vehicle front-rear direction and that have triangular shapes as viewed in vertical cross-section at an upper face of either one of the pair of upper side abutting portions; and the plural projections include second plural ribs that extend along the vehicle width direction and that have triangular shapes as viewed in vertical cross-section at an upper face of the other upper side abutting portion. 
     In the eighth aspect, contact pressure between the lower face of the storage section and the upper face of the upper side abutting portion can be increased since the ribs are formed in triangular shapes as viewed in vertical cross-section. The ribs provided at the either one upper side abutting portion extend in the vehicle front-rear direction. The either one upper side abutting portion therefore easily receives resistive force from the storage section when moving relative to the storage section in the vehicle width direction. The ribs provided at the other upper side abutting portion extend in the vehicle width direction. The other upper side abutting portion therefore easily receives resistive force from the storage section when moving relative to the storage section in the vehicle front-rear direction. Accordingly, when the floor pan vibrates, resistive force received from the storage section by the pair of upper side abutting portion is exerted in mutually different directions, enabling the attachment position of the vibration suppressing section to be suppressed from being offset by vibration of the floor pan. 
     As explained above, the vehicle vibration suppressing structure of the first aspect of the present disclosure has an excellent advantageous effect of suppressing vibrations from occurring in the floor pan even when the storage section that stores the storage object is a size not storable in the floor pan. 
     The vehicle vibration suppressing structure of the second aspect of the present disclosure has an excellent advantageous effect of stabilizing and suppressing vibrations from occurring in the floor pan, even when the vibrations in various directions are generated. 
     The vehicle vibration suppressing structure of the third aspect of the present disclosure has an excellent advantageous effect of reducing the influence of the weight of the vibration suppressing section on vibrations in the floor pan, and suppressing generation of abnormal noise clue to the lower face of the storage section rubbing against the upper face of the vibration suppressing section. 
     The vehicle vibration suppressing structure of the fourth aspect of the present disclosure has an excellent advantageous effect of suppressing vibrations from occurring in the floor pan without modifying the configuration of the floor pan, even when a vehicle mounted battery of large physical volume has been employed. 
     The vehicle vibration suppressing structures of the fifth aspect and the sixth aspect of the present disclosure enable vibrations to be effectively suppressed from occurring in the floor pan. 
     The vehicle vibration suppressing structure of the seventh aspect of the present disclosure enables vibrations to be further suppressed from occurring in the floor pan. 
     The vehicle vibration suppressing structure of the eighth aspect of the present disclosure enables the attachment position of the vibration suppressing section to be suppressed from being offset by vibrations of the floor pan. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred embodiments will be described in detail based on the following figures, wherein: 
         FIG. 1  is a cross-section, illustrating a cut away state along line  1 - 1  in  FIG. 4 , of a vehicle rear section applied with a vehicle vibration suppressing structure according to a first exemplary embodiment viewed from a vehicle front side; 
         FIG. 2  is a cross-section, illustrating a cut away state along line  2 - 2  in  FIG. 4 , of a vehicle rear section applied with a vehicle vibration suppressing structure according to the first exemplary embodiment viewed from a vehicle width direction outside; 
         FIG. 3  is a perspective view illustrating a construction of a foaming material configuring a vehicle vibration suppressing structure according to the first exemplary embodiment; 
         FIG. 4  is a plan view of a vehicle rear section applied with a vehicle vibration suppressing structure according to the first exemplary embodiment viewed from a vehicle upper side; 
         FIG. 5  is an enlarged perspective view illustrating a construction of an upper side abutting portion of a foaming material configuring a vehicle vibration suppressing structure according to a second exemplary embodiment; and 
         FIG. 6  is a perspective view illustrating a construction of a foaming material configuring a vehicle vibration suppressing structure according to a third exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     First Exemplary Embodiment 
     Explanation follows regarding a vehicle vibration suppressing structure according to a first exemplary embodiment of the present invention, with reference to  FIG. 1  to  FIG. 4 . In each of the drawings, an arrow FR indicates a vehicle front side, an arrow UP indicates a vehicle upper side, and an arrow OUT indicates a vehicle width direction outside where appropriate. 
     First, explanation follows regarding a configuration of a vehicle body rear section  14  of a vehicle  10  applied with a vehicle vibration suppressing structure according to the first exemplary embodiment of the present invention, with reference to  FIG. 4 . The vehicle body rear section  14  configures part of a vehicle body  12  of the vehicle  10 . The vehicle body rear section  14  is configured including a rear floor panel  18  serving as a floor panel that constructs part of the vehicle rear side of a floor portion  16  of the vehicle body  12 . The rear floor panel  18  is formed by pressing a steel plate, and is shaped including a general portion  20  that extends in a vehicle front-rear direction and a vehicle width direction, and a floor pan  22  that is contiguously provided at the general portion  20 . 
     The floor pan  22  configures a vehicle rear side portion of the rear floor panel  18 , and, as illustrated in  FIG. 1 , is formed in a concave shape indented further toward the vehicle lower side than the general portion  20 . Namely, the floor pan  22  can be understood as a recess formed in the rear floor panel  18 . The floor pan  22  includes a surrounding wall portion  22 A, a bottom wall portion  22 B that configures a vehicle lower side portion of the floor pan  22 , and a curved wall portion  22 C formed contiguously to the surrounding wall portion  22 A and the bottom wall portion  22 B. The floor pan  22  is formed such that one vehicle width direction side has symmetry with the other vehicle width direction side. 
     As illustrated in  FIG. 1 ,  FIG. 2 , and  FIG. 4 , the surrounding wall portion  22 A of the floor pan  22  extends from a boundary between the floor pan  22  and the general portion  20 , toward the vehicle lower side. The surrounding wall portion  22 A includes a front wall portion  22 A 1  constructing a vehicle front side of the surrounding wall portion  22 A, and a pair of side wall portions  22 A 2  that construct both vehicle width direction sides of the surrounding wall portion  22 A and that extend in the vehicle front-rear direction. More precisely, as viewed from the vehicle upper side, the front wall portion  22 A 1  forms a plate shape that follows a semicircle bulging out to a vehicle front side and a plate thickness direction of the front wall portion  22 A 1  is substantially the radial direction of the semicircle. The side wall portions  22 A 2  form plate shapes that extend from a peripheral edge at the vehicle rear side of the front wall portion  22 A 1  toward a vehicle rear side, such that the plate thickness direction of the side wall portions  22 A 2  is substantially the vehicle width direction. 
     The curved wall portion  22 C includes a curved front wall portion  22 C 1  that forms a vehicle front side of the curved wall portion  22 C, and curved side wall portions  22 C 2  that form both vehicle width direction sides of the curved wall portion  22 C. More precisely, the curved front wall portion  22 C 1  is formed along a peripheral edge at a vehicle lower side of the front wall portion  22 A 1 , and a vertical cross-section profile of the curved front wall portion  22 C 1  forms a curved shape that curves in an arc bulging toward the outer peripheral side and toward the vehicle lower side of the front wall portion  22 A 1 . 
     The curved side wall portions  22 C 2  are formed following vehicle lower side peripheral edges of the side wall portions  22 A 2 , and vertical cross-section profiles of the curved side wall portions  22 C 2  form curved shapes that curve in an arc shape bulging toward the vehicle width direction outside and the vehicle lower side. Namely, the curved wall portions  22 C overall curve so as to bulge toward the outside of the floor pan  22 . 
     The bottom wall portion  22 B is formed such that the peripheral edge of the bottom wall portion  22 B at the vehicle front side is aligned with the vehicle lower side peripheral edge of the curved front wall portion  22 C 1 , and the peripheral edges of the bottom wall portion  22 B at both vehicle width direction sides are aligned with the lower side peripheral edges of the curved side wall portions  22 C 2 . Namely as viewed from the vehicle upper side, the bottom wall portion  22 B is formed in a plate shape that is semicircular at the vehicle front side and rectangular at the vehicle rear side, and the plate thickness direction of the bottom wall portion  22 B is the vehicle up-down direction. 
     As illustrated in  FIG. 1 , a pair of rear side members  26 , constituted from steel, extend along peripheral edges  20 A at both vehicle width direction sides of the general portion  20  of the rear floor panel  18 . 
     The rear side members  26  are disposed at the vehicle lower side of the peripheral edges  20 A of the general portion  20  such that the length direction of the rear side members  26  is the vehicle front-rear direction. Each of the rear side members  26  includes a bulging portion  26 A and a pair of flange portions  26 B, and the cross-section profile of the rear side members  26  form substantial hat shapes open toward the vehicle upper side as viewed along the vehicle front-rear direction. More precisely, each of the bulging portions  26 A forms a plate shape formed into a U-shape that bulges toward the vehicle lower side and is open toward the vehicle upper side. The flange portions  26 B are provided along the respective peripheral edges at both vehicle width direction sides of the bulging portion  26 A, and form rectangular plate shapes in plan view with the vehicle up-down direction as their plate thickness directions. The rear side members  26  are attached to the rear floor panel  18  by joining the rear side members  26  to the rear floor panel  18  using a joining method such as welding, in a state in which the flange portion  26 B makes face contact with the rear floor panel  18 . The rear side members  26  and the rear floor panel  18  thereby configure a chamber structure extending in the vehicle front-rear direction. 
     As illustrated in  FIG. 2  and  FIG. 4 , a floor cross member  28 , constituted from steel, is provided at the vehicle front side of the floor pan  22  at the general portion  20  extending in the vehicle width direction. The floor cross member  28  is disposed at the vehicle lower side of the general portion  20 , and, similarly to the rear side members  26 , includes a bulging portion  28 A and a pair of flange portions  28 B. A cross-section view of the floor cross member  28  forms a substantial hat shape open toward the vehicle upper side as viewed along the vehicle width direction. The floor cross member  28  is attached to the rear floor panel  18  by joining the flange portions  28 B to the rear floor panel  18  using a joining method such as welding in a state in which the flange portions  28 B make face contact with the rear floor panel  18 . The floor cross member  28  and the general portion  20  thereby form a chamber structure extending in the vehicle width direction. A vehicle mounted battery  30  is disposed at the vehicle upper side of the rear floor panel  18 , which is configured as described above. 
     The vehicle mounted battery  30  is, as an example, a battery for a plugin hybrid car, and is configured including a storage case  32  serving as a storage section, and plural battery modules, not illustrated in the drawings, serving as storage objects stored in the storage case  32 . An array of plural battery cells, such as a nickel hydride battery or a lithium ion battery (a secondary battery) are housed in the interior of the battery modules. 
     The storage case  32  is made from die cast aluminum, and includes a main body  34  formed as a rectangular box as viewed from the vehicle upper side, and plural attachments  36  provided at the vehicle front side and both vehicle width direction side peripheral edges of a bottom wall portion  34 A of the main body  34 . The main body  34  is formed large enough to cover the floor pan  22  as viewed from the vehicle upper side. Here, “large enough to cover the floor pan  22 ” includes configurations in which the floor pan  22  is not completely closed off by the storage case  32  as viewed from the vehicle upper side. 
     An insertion portion, not illustrated in the drawings, is formed to each of the attachments  36 , and, as illustrated in  FIG. 1  and  FIG. 2 , weld nuts  38  corresponding to the insertion portions are provided at a vehicle lower side face of the general portion  20  of the rear floor panel  18 . Bolts  40  (fastening members) are inserted into each of the insertion portions of the attachment  36  from the vehicle upper side, and screwed into the weld nuts  38  such that the storage case  32  is attached to the general portion  20  in a state in which the floor pan  22  is covered as viewed from the vehicle upper side. The weld nuts  38  are disposed at positions overlapping the rear side members  26  and the floor cross member  28  of the general portion  20  as viewed along the vehicle up-down direction. Namely, the vehicle mounted battery  30  is attached to a location at the vehicle body rear section  14  at which the chamber structure is disposed by the rear floor panel  18  and the rear side members  26 , and the rear floor panel  18  and the floor cross member  28 . The location where the chamber structure is disposed is a highly rigid portion in the vehicle body rear section  14 . 
     In the present exemplary embodiment, a foaming material  42  serving as a vibration suppressing portion is interposed between a lower face  32 A of the storage case  32  and the bottom wall portion  22 B of the floor pan  22 . Detailed explanation follows regarding the foaming material  42 . 
     As illustrated in  FIG. 1  to  FIG. 3 , the foaming material  42  includes a lower side abutting portion  44  that abuts the floor pan  22 , and a pair of upper side abutting portions  46  that abut the vehicle mounted battery  30 . The foaming material  42  is constituted from a foaming resin, such as urethane foam or styrene foam, so as to be elastically deformable. 
     The lower side abutting portion  44  is formed including a bottom wall portion side abutting region  44 A mostly disposed along the bottom wall portion  22 B of the floor pan  22 , and a curved wall portion side abutting region  44 B disposed mostly along the curved front wall portion  22 C 1  of the floor pan  22 . More specifically, the bottom wall portion side abutting region  44 A and the curved wall portion side abutting region  44 B are formed with a specific thickness, and are formed such that the curved wall portion side abutting region  44 B extends out from one side of the bottom wall portion side abutting region  44 A. A lower face  44 A 1  of the bottom wall portion side abutting region  44 A has a shape capable of face contact with the bottom wall portion  22 B. In other words, the lower face  44 A 1  has a planar shape. A lower face  44 B 1  of the curved wall portion side abutting region  44 B has a shape capable of face contact with the curved front wall portion  22 C 1 . In other words, the lower face  44 B 1  has a curved face shape. 
     Another side of the bottom wall portion side abutting region  44 A is raised in a thickness direction of the bottom wall portion side abutting region  44 A in a rectangular block shape (referred to as the raised portion  44 A 2  hereafter), and a recess  48  is formed between the curved wall portion side abutting region  44 B and the raised portion  44 A 2 . In a state in which the foaming material  42  is disposed in the floor pan  22 , the lower side abutting portion  44 , configured as described above, forms a rectangular shape in which the vehicle front side is semicircular as viewed from the vehicle upper side. Upper side abutting portions  46  are provided at the raised portion  44 A 2  of the lower side abutting portion  44 . 
     In the state in which the foaming material  42  is disposed in the floor pan  22 , the upper side abutting portions  46  are provided disposed such there is a space between the respective upper side abutting portions  46  along the vehicle width direction. The upper side abutting portions  46  are made as rectangular pillar shapes having their length directions along the vehicle up-down direction, and plural projections  50  are provided at upper faces  46 A 1  of leading end portions  46 A of the upper side abutting portions  46 . 
     The projections  50  project from the upper faces  46 A 1  of the upper side abutting portions  46 , and in total, nine projections  50  are placed in three rows having even placement pitches along an edge of the upper face  46 A 1 , and in three rows having even placement pitches along an edge orthogonal to that edge. The projections  50  are each shaped as a half sphere, and the apex of each of the projections  50  abuts the lower face  32 A of the storage case  32 . 
     As illustrated in  FIG. 4 , the curved wall portion side abutting region  44 B of the foaming material  42 , configured as described above, is disposed at a position abutting a vehicle width direction central portion of the curved front wall portion  22 C 1  of the floor pan  22 , and is installed on the bottom wall portion  22 B. 
     More precisely, the foaming material  42  undergoes compression deformation due to being pressed by the vehicle mounted battery  30  from the vehicle upper side, and is fixed by friction generated between the lower face  32 A of the storage case  32  and the bottom wall portion  22 B of the floor pan  22 . When this occurs, a state is adopted in which the lower face  44 A 1  of the bottom wall portion side abutting region  44 A of the foaming material  42  makes face contact with the bottom wall portion  22 B, and the lower face  44 B 1  of the curved wall portion side abutting region  44 B makes face contact with the curved front wall portion  22 C 1 . Although the curved wall portion side abutting region  44 B is also disposed on a front wall portion  22 A 1  side in addition to a curved front wall portion  22 C 1  side, the curved wall portion side abutting region  44 B can be made to follow the front wall portion  22 A 1  due to the curved wall portion side abutting region  44 B undergoing compression deformation toward a recess  48  side. The upper side abutting portions  46  adopt a state of point-contact with the lower face  32 A at plural locations since the projections  50  of the upper side abutting portions  46  abut the lower face  32 A of the storage case  32 . 
     Operation and Advantageous Effects of Present Exemplary Embodiment 
     Next, explanation follows regarding operation and advantageous effects of the present exemplary embodiment. 
     As illustrated in  FIG. 1 , in the present exemplary embodiment, the rear floor panel  18 , which configures part of the vehicle body  12 , is constructed including the general portion  20  extending in the vehicle front-rear direction and the vehicle width direction, and the floor pan  22  provided contiguously to the general portion  20 . The floor pan  22  is formed in a concave shape indented toward the vehicle lower side enabling various members to be stored inside the floor pan  22 . 
     For example, it is conceivable that a storage case capable of storing the battery modules could be stored in the floor pan  22 . In this configuration, the bottom wall portion  22 B of the floor pan  22  is pressed by the load of the storage case and the battery modules stored therein, and, as a result, vibrations can be suppressed from occurring in the floor pan  22 . However, when the storage case is a size not storable in the floor pan  22 , the bottom wall portion  22 B of the floor pan  22  is no longer pressed, and it becomes difficult to suppress vibrations from occurring in the floor pan  22 . 
     In the present exemplary embodiment, the storage case  32  of the vehicle mounted battery  30  covers the floor pan  22  as viewed from the vehicle upper side and is attached to the general portion  20  of the rear floor panel  18 . Namely, although the physical volume of the storage case  32  can be set larger than in cases in which the storage case  32  is a size storable in the floor pan  22  in the present exemplary embodiment, it is difficult to press the bottom wall portion  22 B of the floor pan  22  directly using the storage case  32 . 
     In the present exemplary embodiment, the foaming material  42  is disposed between the lower face  32 A of the storage case  32  and the bottom wall portion  22 B of the floor pan  22  in a state of contact with the lower face  32 A and the bottom wall portion  22 B. Thus, the storage case  32  can press the bottom wall portion  22 B of the floor pan  22  through the foaming material  42 . Accordingly, in the present exemplary embodiment, vibrations can be suppressed from occurring in the floor pan  22  even when the storage case  32  that stores the battery modules has a size not storable in the floor pan  22 . 
     In the present exemplary embodiment, the floor pan  22  is formed including the surrounding wall portion  22 A, and the curved wall portion  22 C that is formed contiguously to the surrounding wall portion  22 A and the bottom wall portion  22 B. The surrounding wall portion  22 A extends from the boundary between the floor pan  22  and the general portion  20  of the rear floor panel  18  toward the vehicle lower side, and the curved wall portion  22 C curves so as to bulge toward the outside of the floor pan  22 . The curved wall portion  22 C is therefore influenced by vibrations substantially in the vehicle up-down direction generated at the bottom wall portion  22 B, and vibrations substantially in the vehicle front-rear direction and the vehicle width direction generated at the surrounding wall portion  22 A. In the present exemplary embodiment, the lower face  44 B 1  of the foaming material  42  makes face contact, with the curved wall portion  22 C of the floor pan  22  such that the storage case  32  can press the bottom wall portion  22 B and the curved wall portion  22 C of the floor pan  22  through the foaming material  42 . As a result, reaction forces can be given counter to vibrations of the floor pan  22  in various directions. Accordingly, in the present exemplary embodiment, even when vibrations are generated in various directions at the floor pan  22 , the vibrations can be stabilized and suppressed. Since large vibrations are generally liable to be generated in the vehicle width direction central portion of the curved front wall portion  22 C 1  of the floor pan  22 , the curved wall portion side abutting region  44 B of the foaming material  42  is caused to abut this portion in the present exemplary embodiment. Such a configuration achieves higher effectiveness for suppressing vibrations in the floor pan  22  using the foaming material  42 , and achieves a decrease in the scale of the foaming material  42 . 
     In the present exemplary embodiment, weight can be reduced compared to cases in which the foaming material  42  is constituted from a metal or the like since the foaming material  42  is constituted from a resin. Plural projections  50  are provided so as to project from the upper face  46 A 1  of the foaming material  42 , and the projections  50  abut the lower face  32 A of the storage case  32 . This increases the abutting pressure between the lower face  32 A and the upper face  46 A 1  compared to cases in which the upper face  46 A 1  is configured as a planar shape. As a result, in a state in which the lower face  32 A of the storage case  32  contacts the upper face  46 A 1  of the foaming material  42 , the upper face  46 A 1  is suppressed from moving relative to the lower face  32 A. Accordingly, in the present exemplary embodiment, the influence of the weight of the foaming material  42  on the vibrations of the floor pan  22  can be reduced, and generation of abnormal noise caused by the lower face  32 A of the storage case  32  rubbing against the upper face  46 A 1  of the foaming material  42  can also be suppressed. 
     In addition, in the present exemplary embodiment, the vehicle mounted battery  30  includes plural battery modules and the storage case  32  that stores the battery modules. The vehicle mounted battery  30  can therefore be employed as a power source in a hybrid car or a plugin hybrid car. 
     When the vehicle mounted battery  30  is a size storable in the floor pan  22 , the bottom wall portion of the floor pan  22  can be pressed by the load of the vehicle mounted battery  30  as explained above, and, as a result, vibrations can be suppressed from occurring in the floor pan  22 . 
     However, in cases in which the vehicle mounted battery  30  has a large physical volume, like those employed in plugin hybrid cars, the vehicle mounted battery  30  is difficult to store in the floor pan  22 . As a result, it is conceivable that vibrations become difficult to suppress from occurring in the floor pan  22 . Although it is conceivable that the floor pan  22  could be configured capable of storing a vehicle mounted battery of large physical volume, it would then be necessary to modify the configuration of the floor pan  22 , and thus the vehicle body  12 . 
     In the present exemplary embodiment, the storage case  32  of the vehicle mounted battery  30  can press against the bottom wall portion  22 B of the floor pan  22  through the foaming material  42 . Thus, even when the vehicle mounted battery  30  is a size not storable in the floor pan  22 , vibrations can be suppressed from occurring in the floor pan  22  while maintaining the configuration of the floor pan  22 . Accordingly, in the present exemplary embodiment, vibrations can be suppressed from occurring in the floor pan  22  without modifying the configuration of the floor pan  22  even when a vehicle mounted battery  30  of large physical volume is employed. 
     Second Exemplary Embodiment 
     Next, explanation follows regarding a configuration of a vehicle vibration suppressing structure of a second exemplary embodiment according to the present invention, with reference to  FIG. 5 . In a foaming material  70  illustrated in  FIG. 5 , portions other than an upper side abutting portion  72  are configured similarly to those of the foaming material  42  of the first exemplary embodiment described above, and so only the upper side abutting portion  72  is illustrated in the drawings. 
     The second exemplary embodiment differs from the first exemplary embodiment described above in that the shape of projections  74 , formed on an upper face  72 A 1  of a leading end portion  72 A of the upper side abutting portion  72 , are square pyramid shapes. More specifically, plural projections  74  formed on the upper face  72 A 1  of the upper side abutting portion  72  are each formed at different sizes falling within a specific range, and their installation positions are arbitrarily set. 
     In the foaming material  70  configured as described above, even when the lower face  32 A of the storage case  32  is formed with undulations, the projections  74  elastically deform as they enter the undulations, thereby suppressing movement of the upper face  72 A 1  of the upper side abutting portion  72  relative to the lower face  32 A of the storage case  32 . The present exemplary embodiment therefore exhibits similar operation and advantageous effects as in the first exemplary embodiment described above, even when the storage case  32  is formed with undulations on the lower face  32 A. 
     Third Exemplary Embodiment 
     Next, explanation follows regarding a configuration of a vehicle vibration suppressing structure of a third exemplary embodiment according to the present invention, with reference to  FIG. 6 . Other than a foaming material  90 , the configuration of the present exemplary embodiment is similar to the configuration of the first exemplary embodiment described above, and elements other than the foaming material  90  are therefore omitted from illustration in  FIG. 6 . 
     Similarly to the foaming material  42  according to the first exemplary embodiment, the foaming material  90  is formed including a lower side abutting portion  92  and a pair of upper side abutting portions  94 ,  96 , and the lower side abutting portion  92  and the upper side abutting portions  94 ,  96  are configured differently to those of foaming material  42 . 
     To explain more specifically, the lower side abutting portion  92  is essentially configured similarly to the lower side abutting portion  44  of the first exemplary embodiment, but unlike the lower side abutting portion  44 , is not formed with the recess  48 . Namely, the lower side abutting portion  92  is essentially a block shape having uniform thickness in the vehicle front-rear direction and the vehicle width direction, and is formed including a lower face  92 A capable of making face contact with the bottom wall portion  22 B of the floor pan  22  and a lower face  92 B capable of making face contact with the curved front wall portion  22 C 1 . 
     As viewed along the vehicle width direction, the upper side abutting portions  94 ,  96  gradually widen in width on progression toward the vehicle front side and toward the lower side abutting portion  92  from leading end portions  94 A,  96 A thereof, and a boundary between the upper side abutting portions  94 ,  96  and the lower side abutting portion  92  at the vehicle front side is shaped as a curved face. As viewed along the vehicle front-rear direction, the upper side abutting portion  94  widens in width from the leading end portion  94 A thereof on progression toward the lower side abutting portion  92 , and, similarly, the upper side abutting portion  96  widens in width from the leading end portion  96 A thereof on progression toward the lower side abutting portion  92 . 
     Plural ribs  98 , serving as projections, formed extending in the vehicle front-rear direction and formed with triangular shapes as viewed in vertical cross-section, are provided at an upper face  94 A 1  of the leading end portion  94 A of the upper side abutting portion  94 . Plural ribs  100 , serving as projections formed extending in the vehicle width direction and formed with triangular shapes as viewed in vertical cross-section, are provided at an upper face  96 A 1  of the leading end portion  96 A of the upper side abutting portion  96 . 
     In the foaming material  90  formed as described above, the ribs  98 ,  100  form triangular shapes as viewed in vertical cross-section, such that the contact pressure between the lower face  32 A of the storage case  32  and the upper faces  94 A 1 ,  96 A 1  of the upper side abutting portions  94 ,  96  is increased. Accordingly, the present exemplary embodiment also exhibits similar operation and advantageous effects to those of the first exemplary embodiment described above. 
     In the present exemplary embodiment, the lower side abutting portion  92  has uniform thickness in the vehicle front-rear direction and the vehicle width direction, and the upper side abutting portions  94 ,  96  gradually widen in width from the leading end portions  94 A,  96 A thereof, toward the lower side abutting portion  92 . The pressing force from the storage case  32  can accordingly be suppressed from acting unevenly on the lower faces  92 A,  92 B of the lower side abutting portion  92 . 
     In the present exemplary embodiment, the ribs  98  provided at the upper side abutting portion  94  extend in the vehicle front-rear direction. Thus, the upper side abutting portion  94  does not easily receive a resistance force from the storage case  32  when the upper side abutting portions  94  moves in the vehicle front-rear direction relative to the storage case  32 ; however, the upper side abutting portions  94  easily receives the resistance force from the storage case  32  when the upper side abutting portions  94  moves in the vehicle width direction relative to the storage case  32 . The ribs  100  provided at the upper side abutting portion  96  extend in the vehicle width direction. Thus, the upper side abutting portion  96  does not easily receive the resistance force from the storage case  32  when the upper side abutting portion  96  moves in the vehicle width direction relative to the storage case  32 ; however, the upper side abutting portion  96  easily receives the resistance force from the storage case  32  when the upper side abutting portion  96  moves in the vehicle front-rear direction relative to the storage case  32 . Accordingly, when the floor pan  22  has vibrated, the resistance force that the upper side abutting portions  94 ,  96  receive from the storage case  32  operates in different directions such that the attachment position of the foaming material  90  can be suppressed from being offset by the vibrations of the floor pan  22 . 
     Supplementary Explanation of Above Exemplary Embodiments 
     (1) Although the foaming material is disposed at a position abutting the vehicle width direction central portion of the curved front wall portion  22 C 1  of the floor pan  22  in the exemplary embodiments described above, there is no limitation thereto. Namely, the foaming material may be disposed so as to abut the bottom wall portion  22 B and the curved side wall portions  22 C 2 . Moreover, the foaming material may be formed as a shape capable of abutting the curved front wall portion  22 C 1  and the curved side wall portions  22 C 2  of the floor pan  22 , or plural foaming materials may each abut the curved front wall portion  22 C 1  and the curved side wall portions  22 C 2 . 
     (2) Although the foaming material includes an upper side abutting portion and a lower side abutting portion in the exemplary embodiments above, there is no limitation thereto. As an example, the foaming material may be formed with a circular pillar shape, and any of the projections described above are provided on both of the end faces of the foaming material. 
     (3) Although the vibration suppressing portion is configured from a resin in the exemplary embodiments described above, the vibration suppressing portion may be configured from a metal. As an example, the vibration suppressing portion may be configured from a steel I beam, and flange portions thereof contact the lower face  32 A of the storage case  32  and the bottom wall portion  22 B of the floor pan  22 . Moreover, rubber plates are provided on the surfaces of the flange portions. 
     (4) In addition, although the vehicle vibration suppressing structure is applied to a vehicle  10  in which the vehicle mounted battery  30  is disposed at the vehicle upper side of the rear floor panel  18  in the exemplary embodiments described above, there is no limitation thereto. For example, the vehicle vibration suppressing structure according to the exemplary embodiments described above may also be applied to a vehicle in which a large scale storage box that stores a tool or the like is disposed at the vehicle upper side of a rear floor panel. 
     (5) Although the first exemplary embodiment described above has a configuration in which the projections  50  are provided at the foaming material  42 , the ribs  98 ,  100  may be provided instead of the projections  50 . Although the ribs  98 ,  100  are provided at the foaming material  90  in the third exemplary embodiment described above, the projections  50  or the projections  74  are provided instead of the ribs  98 ,  100 . The foaming material  90  may be provided with the ribs  98  or the ribs  100  on both of the upper side abutting portions  94 ,  96 .