Railcar

Abstract

According to a railcar, a low-floor underframe includes side beams to which side bodyshells are coupled, a high-floor underframe includes a center sill disposed to extend in a car longitudinal direction at a center in a car width direction and a body bolster coupled to this center sill and to be an installation portion of a bogie, and the body bolster is coupled to the side beam by a coupling member. Thus, the car end compression load input to the high-floor underframe can be directly transmitted from the center sill and the body bolster to the side beams via the coupling member. This can disperse the car end compression load on the side bodyshells to ensure the car strength against the car end compression load.

1 . A railcar comprising:
 a low-floor underframe disposed at a center portion in a car longitudinal direction;   high-floor underframes arranged at one side and another side in the car longitudinal direction across the low-floor underframe, and upper and lower positions of the high-floor underframes being set higher than upper and lower positions of the low-floor underframe; and   coupling members that couple the low-floor underframe to the high-floor underframes in postures that incline downward from the high-floor underframes toward the low-floor underframe,   wherein the low-floor underframe includes side beams to which side bodyshells are coupled,   the high-floor underframe includes a center sill disposed to extend in the car longitudinal direction at a center in a car width direction, and a body bolster to which the center sill is coupled to be an installation portion of a bogie, and   the body bolster of the high-floor underframe is coupled to the side beams of the low-floor underframe by the coupling member.   
     
     
         2 . The railcar according to  claim 1 ,
 wherein the high-floor underframe includes side beams, and   the side bodyshell includes:
 a first side post coupled to the side beam of the low-floor underframe at a lower end to be disposed to extend in the car up and down direction; and 
 a first frame member that couples the first side post to the side beam of the high-floor underframe and is disposed to extend in the car longitudinal direction. 
   
     
     
         3 . The railcar according to  claim 2 , comprising
 a second-floor floor member disposed above the low-floor underframe of a car to support a floor surface of a second-floor,   wherein an upper end of the first side post of the side bodyshell is coupled to the second-floor floor member.   
     
     
         4 . The railcar according to  claim 3 ,
 wherein the side bodyshell includes a second side post coupled to the side beam of the high-floor underframe at a lower end to be disposed to extend in the car up and down direction, and   the second side post of the side bodyshell is disposed at a position approximately corresponding to a position where the coupling member is coupled to the body bolster of the high-floor underframe, in the car longitudinal direction, the second side post being coupled to the second-floor floor member.   
     
     
         5 . The railcar according to  claim 4 ,
 wherein an upper end of the second side post of the side bodyshell is coupled to a roof bodyshell.   
     
     
         6 . The railcar according to  claim 5 ,
 wherein the coupling member, the first side post, the first frame member, and the second side post are formed of members with closed cross-section structures.