Underfloor double skin structure, vehicle underfloor structure, and vehicle

Abstract

An underfloor double skin structure includes a first upper plate including a pair of first thin portions disposed on both end portions thereof and a first thick portion disposed inwardly with respect to the pair of first thin portions, a first lower plate disposed to be spaced apart downward of the first upper plate and including a pair of second thin portions disposed on both end portions thereof and a second thick portion disposed inwardly with respect to the pair of second thin portions, a first rib group integrally formed with the first upper plate and the first lower plate and connects the first upper plate and the first lower plate, a reinforcing body is formed of the first thick portion, the second thick portion, and a pair of thick ribs, and the second thick portion is disposed downward of the pair of second thin portions.

1 . An underfloor double skin structure configuring an underfloor for a vehicle, comprising:
 a first upper plate that extends in a forward and rearward direction of the vehicle;   a first lower plate that extends in the forward and rearward direction of the vehicle, the first lower plate being disposed to be spaced apart downward of the first upper plate; and   a first rib group that includes a plurality of ribs, the plurality of ribs being integrally formed with the first upper plate and the first lower plate, the plurality of ribs being provided between the first upper plate and the first lower plate, and the plurality of ribs being configured to connect the first upper plate and the first lower plate with each other,   wherein the first upper plate includes a pair of first thin portions and a first thick portion thicker than each of the pair of first thin portions, the pair of first thin portions configuring both end portions of the first upper plate in a width direction of the vehicle,   the first lower plate includes a pair of second thin portions and a second thick portion thicker than each of the pair of second thin portions, the pair of second thin portions configuring the end portions of the first lower plate in the width direction of the vehicle,   the first rib group includes a pair of thick ribs which are disposed to be spaced apart from each other in the width direction of the vehicle, the pair of thick ribs being configured to connect the first thick portion and the second thick portion to each other, and each of the pair of thick ribs being thicker than each of the first thin portion and the second thin portion,   a reinforcing body is formed by the first thick portion, the second thick portion, and the pair of thick ribs, and   the second thick portion is disposed downward of the pair of second thin portions.   
     
     
         2 . The underfloor double skin structure according to  claim 1 ,
 wherein the reinforcing body partitions a plane perpendicular to the forward and rearward direction of the vehicle to be a closed space.   
     
     
         3 . The underfloor double skin structure according to  claim 1 ,
 wherein the second thick portion and the pair of second thin portions are disposed adjacent to each other in a horizontal direction, and   the second thick portion and the pair of second thin portions are integrally formed in the width direction of the vehicle.   
     
     
         4 . The underfloor double skin structure according to  claim 1 ,
 wherein the pair of thick ribs extend downward of the pair of second thin portions.   
     
     
         5 . The underfloor double skin structure according to  claim 1 ,
 wherein the pair of thick ribs connect the first thick portion and the second thick portion to each other in a vertical direction.   
     
     
         6 . The underfloor double skin structure according to  claim 5 ,
 wherein the first rib group includes a pair of inclined ribs that connect the first thick portion and the second thick portion to each other, and   the pair of inclined ribs are inclined in a direction in which a distance between the pair of inclined ribs increases from the second thick portion toward the first thick portion.   
     
     
         7 . The underfloor double skin structure according to  claim 1 ,
 wherein the first thick portion and the second thick portion are flat plates, and   the reinforcing body is bilaterally symmetrical with respect to a first plane which passes through a center position of the reinforcing body, the first plane being perpendicular to the first thick portion and the second thick portion, and the first plane being parallel with the forward and rearward direction of the vehicle.   
     
     
         8 . The underfloor double skin structure according to  claim 1 ,
 wherein the first thick portion and the second thick portion are flat plates, and   a structure including at least the first thick portion, the second thick portion, and the pair of thick ribs in the reinforcing body is vertically symmetrical with respect to a second plane which passes through an intermediate position between the first thick portion and the second thick portion while being parallel with the first thick portion and the second thick portion.   
     
     
         9 . The underfloor double skin structure according to  claim 3 ,
 wherein the first thick portion and the pair of first thin portions are disposed adjacent to one another in the horizontal direction, and the first thick portion and the pair of first thin portions are integrally formed in the width direction of the vehicle, and   a structure including the pair of first thin portions, the pair of second thin portions, the first thick portion, the second thick portion, and the pair of thick ribs are vertically symmetrical with respect to a second plane which passes through an intermediate position between the first thick portion and the second thick portion while being parallel with the first thick portion and the second thick portion.   
     
     
         10 . A vehicle underfloor structure comprising:
 the underfloor double skin structure according to  claim 1 ; and   another double skin structure provided in a position adjacent to the underfloor double skin structure in the width direction of the vehicle;   wherein the other double skin structure comprises:
 a second upper plate that extends in the forward and rearward direction of the vehicle; 
 a second lower plate that is disposed to be spaced apart downward of the second upper plate and extends in the forward and rearward direction of the vehicle; and 
 a second rib group that is integrally formed with the second upper plate and the second lower plate, is provided between the second upper plate and the second lower plate, and connects the second upper plate and the second lower plate to each other, 
   wherein an end of the second upper plate is connected to an end of the first upper plate, and   an end of the second lower plate is connected to an end of the first lower plate.   
     
     
         11 . A vehicle comprising:
 the vehicle underfloor structure according to  claim 10 .   
     
     
         12 . (canceled) 
     
     
         13 . An underfloor double skin structure configuring an underfloor for a vehicle, comprising:
 a first upper plate that extends in a forward and rearward direction of the vehicle;   a first lower plate that extends in the forward and rearward direction of the vehicle, the first lower plate being disposed to be spaced apart downward of the first upper plate; and   a first rib group that includes a plurality of ribs, the plurality of ribs being integrally formed with the first upper plate and the first lower plate, the plurality of ribs being provided between the first upper plate and the first lower plate, and the plurality of ribs being configured to connect the first upper plate and the first lower plate with each other,   wherein the first upper plate includes a pair of first thin portions and a first thick portion thicker than each of the pair of first thin portions, the pair of first thin portions configuring both end portions of the first upper plate in a width direction of the vehicle,   the first lower plate includes a pair of second thin portions and a second thick portion thicker than each of the pair of second thin portions, the pair of second thin portions configuring the end portions of the first lower plate in the width direction of the vehicle,   the first rib group includes a pair of thick ribs which are disposed to be spaced apart from each other in the width direction of the vehicle, the pair of thick ribs being configured to connect the first thick portion and the second thick portion to each other, and each of the pair of thick ribs being thicker than each of the first thin portion and the second thin portion,   a reinforcing body is formed by the first thick portion, the second thick portion, and the pair of thick ribs, and   the reinforcing body partitions a plane perpendicular to the forward and rearward direction of the vehicle to be a closed space.   
     
     
         14 . The underfloor double skin structure according to  claim 13 ,
 wherein the second thick portion and the pair of second thin portions are disposed adjacent to each other in a horizontal direction, and   the second thick portion and the pair of second thin portions are integrally formed in the width direction of the vehicle.   
     
     
         15 . The underfloor double skin structure according to  claim 13 ,
 wherein the pair of thick ribs extend downward of the pair of second thin portions, and   the second thick portion is disposed downward of the pair of second thin portions.   
     
     
         16 . The underfloor double skin structure according to  claim 13 ,
 wherein the pair of thick ribs connect the first thick portion and the second thick portion to each other in a vertical direction.   
     
     
         17 . The underfloor double skin structure according to  claim 16 ,
 wherein the first rib group includes a pair of inclined ribs that connect the first thick portion and the second thick portion to each other, and   the pair of inclined ribs are inclined in a direction in which a distance between the pair of inclined ribs increases from the second thick portion toward the first thick portion.   
     
     
         18 . The underfloor double skin structure according to  claim 13 ,
 wherein the first thick portion and the second thick portion are flat plates, and   the reinforcing body is bilaterally symmetrical with respect to a first plane which passes through a center position of the reinforcing body, the first plane being perpendicular to the first thick portion and the second thick portion, and the first plane being parallel with the forward and rearward direction of the vehicle.   
     
     
         19 . The underfloor double skin structure according to  claim 13 ,
 wherein the first thick portion and the second thick portion are flat plates, and   a structure including at least the first thick portion, the second thick portion, and the pair of thick ribs in the reinforcing body is vertically symmetrical with respect to a second plane which passes through an intermediate position between the first thick portion and the second thick portion while being parallel with the first thick portion and the second thick portion.   
     
     
         20 . The underfloor double skin structure according to  claim 14 ,
 wherein the first thick portion and the pair of first thin portions are disposed adjacent to one another in the horizontal direction, and the first thick portion and the pair of first thin portions are integrally formed in the width direction of the vehicle, and   a structure including the pair of first thin portions, the pair of second thin portions, the first thick portion, the second thick portion, and the pair of thick ribs are vertically symmetrical with respect to a second plane which passes through an intermediate position between the first thick portion and the second thick portion while being parallel with the first thick portion and the second thick portion.   
     
     
         21 . A vehicle underfloor structure comprising:
 the underfloor double skin structure according to  claim 13 ; and   another double skin structure provided in a position adjacent to the underfloor double skin structure in the width direction of the vehicle;   wherein the other double skin structure comprises:
 a second upper plate that extends in the forward and rearward direction of the vehicle; 
 a second lower plate that is disposed to be spaced apart downward of the second upper plate and extends in the forward and rearward direction of the vehicle; and 
 a second rib group that is integrally formed with the second upper plate and the second lower plate, is provided between the second upper plate and the second lower plate, and connects the second upper plate and the second lower plate to each other, 
   wherein an end of the second upper plate is connected to an end of the first upper plate, and   an end of the second lower plate is connected to an end of the first lower plate.