Rail Vehicle and Manufacturing Method for Rail Vehicle

Abstract

A rail vehicle has a return flow path structure formed by a lower tube portion, an upper tube portion, a seat, and an opening or a notch of a seat base. When air flows from the inside of a vehicle cabin to an exhaust port connected to an exhaust air flow path under a floor via the return flow path structure, a direction of a flow passing between an outer periphery of the lower tube portion and an inner periphery of the upper tube portion is opposite to a direction of a flow passing through an inner side of the lower tube portion.

What is claimed is: 
     
         1 . A rail vehicle comprising:
 a seat base disposed on a floor of a vehicle cabin and having an opening or a notch;   a seat disposed facing the opening or the notch of the seat base;   an exhaust air flow path disposed under the floor;   an exhaust port formed in the floor in a manner of facing the opening or the notch of the seat base, and configured to allow the exhaust air flow path and the inside of the vehicle cabin to communicate with each other;   a lower tube portion provided on the floor and including the exhaust port; and   an upper tube portion disposed below the seat base and including a part of the lower tube portion, wherein   a return flow path structure is formed by the lower tube portion, the upper tube portion, the seat, and the opening or the notch of the seat base, and   when air flows from the inside of the vehicle cabin to the exhaust port via the return flow path structure, a direction of a flow passing between an outer periphery of the lower tube portion and an inner periphery of the upper tube portion is opposite to a direction of a flow passing through an inner side of the lower tube portion.   
     
     
         2 . The rail vehicle according to  claim 1 , wherein
 the seat includes a seat sound absorbing member on a surface facing the opening or the notch.   
     
     
         3 . The rail vehicle according to  claim 1 , wherein
 a sound absorbing material is disposed in the opening or the notch.   
     
     
         4 . The rail vehicle according to  claim 1 , wherein
 a sound absorbing material is disposed on at least a part of an inner peripheral surface of one of the lower tube portion and the upper tube portion.   
     
     
         5 . The rail vehicle according to  claim 1 , wherein
 the seat base has a first leg portion, a second leg portion, and a top wall supported by the first leg portion and the second leg portion, and the opening or the notch is formed in the top wall,   the lower tube portion has a peripheral wall formed by a plurality of upper walls and the second leg portion connected to the upper walls, and   the upper tube portion has a peripheral wall formed by a plurality of lower walls and the second leg portion connected to the lower walls.   
     
     
         6 . A manufacturing method for the rail vehicle according to  claim 5 , the manufacturing method comprising:
 joining the first leg portion, the second leg portion, and the top wall and connecting the plurality of upper walls to the second leg portion to form a seat assembly including the upper tube portion;   erecting the plurality of lower walls on the floor adjacent to the exhaust port; and   connecting the second leg portion of the seat assembly to the plurality of lower walls to form the lower tube portion.   
     
     
         7 . A manufacturing method for the rail vehicle according to  claim 5 , the manufacturing method comprising:
 erecting the plurality of lower walls and the second leg portion on the floor adjacent to the exhaust port to form the lower tube portion;   joining the first leg portion and the top wall to form a seat assembly including the plurality of upper walls; and   connecting the second leg portion to the top wall of the seat assembly and connecting the plurality of upper walls to the second leg portion to form the upper tube portion.