Railcar bodyshell
A double skin structure of a railcar bodyshell includes: a harmonica type structural portion in which a closed space is quadrangular when viewed from a car longitudinal direction; and a truss type structural portion which is located adjacent to the harmonica type structural portion and in which a closed space is triangular when viewed from the car longitudinal direction. A thickness reduced portion is formed in at least one of a region between a car width direction middle portion of a roof bodyshell and a car body circumferential direction middle portion of a cantrail. The thickness reduced portion having a bodyshell thickness that is made small by arranging an inner wall of the thickness reduced portion at a car exterior side of the inner wall of a region adjacent to the region in which the thickness reduced portion is formed.
1. A railcar bodyshell comprising:
an underframe including a side sill;
a side bodyshell; and
a roof bodyshell, wherein:
the side bodyshell, the roof bodyshell, and the side sill include a double skin structure, the double skin structure including an inner wall, an outer wall, and a plurality of coupling plates coupling the inner wall and the outer wall to each other such that wall surfaces of the inner and outer walls are spaced apart from each other;
the double skin structure includes
a harmonica configured structural portion in which a closed space formed by the inner wall, the outer wall, and two adjacent coupling plates among the plurality of coupling plates is quadrangular when viewed from a car longitudinal direction, and
a truss shaped structural portion which is located adjacent to the harmonica configured structural portion when viewed from the car longitudinal direction and in which a closed space formed by the two coupling plates and one of the inner wall and the outer wall is triangular when viewed from the car longitudinal direction; and
when viewed from the car longitudinal direction, a thickness reduced portion is formed in at least one of a region between a car width direction middle portion of the roof bodyshell and a middle portion of a cantrail, a region between the middle portion of the cantrail and a pier panel of the side bodyshell, and a region between the pier panel of the side bodyshell and the side sill in the double skin structure, the thickness reduced portion being sandwiched between two adjacent thicker regions adjacently located at both sides of the thickness reduced portion in a circumferential direction of a car body and having a bodyshell thickness that is made small in such a manner that the inner wall of the thickness reduced portion is partially depressed toward the outer wall and is arranged outwardly of a car exterior side of the inner wall of the two adjacent thicker regions.
2. The railcar bodyshell according to claim 1 , wherein the thickness reduced portion is formed so as to correspond to a position where an absolute value of a bending moment acting on the railcar bodyshell becomes a minimum value when viewed from the car longitudinal direction.
3. The railcar bodyshell according to claim 1 , wherein the harmonica configured structural portion is arranged at at least one of the car width direction middle portion of the roof bodyshell, the middle portion of the cantrail, and the pier panel of the side bodyshell.
4. A railcar bodyshell comprising:
an underframe including a side sill;
a side bodyshell; and
a roof bodyshell, wherein:
the side bodyshell, the roof bodyshell, and the side sill include a double skin structure, the double skin structure including an inner wall, an outer wall, and a plurality of coupling plates coupling the inner wall and the outer wall to each other such that wall surfaces of the inner and outer walls are spaced apart from each other;
at least one of the inner wall, the outer wall, and the plurality of coupling plates has different plate thicknesses at a plurality of positions when viewed from a car longitudinal direction; and
when viewed from the car longitudinal direction, a thickness reduced portion is formed in at least one of a region between a car width direction middle portion of the roof bodyshell and a middle portion of a cantrail, a region between the middle portion of the cantrail and a pier panel of the side bodyshell, and a region between the pier panel of the side bodyshell and the side sill in the double skin structure, the thickness reduced portion being sandwiched between two adjacent thicker regions adjacently located at both sides of the thickness reduced portion in a circumferential direction of a car body and having a bodyshell thickness that is made small in such a manner that the inner wall of the thickness reduced portion is partially depressed toward the outer wall and is arranged outwardly of a car exterior side of the inner wall of the two adjacent regions.
5. The railcar bodyshell according to claim 4 , wherein any of the plurality of coupling plates includes a gradually decreased region having a plate thickness that gradually decreases from one of a car interior side and car exterior side of the car body to the other.
6. The railcar bodyshell according to claim 4 , wherein:
the double skin structure further includes a harmonica configured structural portion in which a closed space formed by the inner wall, the outer wall, and two adjacent coupling plates among the plurality of coupling plates is quadrangular when viewed from the car longitudinal direction; and
when viewed from the car longitudinal direction, two or more coupling plates adjacent to each other in the circumferential direction of the car body among the plurality of coupling plates arranged in the harmonica configured structural portion extend in directions intersecting with each other.
7. The railcar bodyshell according to claim 6 , wherein when viewed from the car longitudinal direction, the two or more coupling plates adjacent to each other extend in parallel with directions in which shear force generated by an atmospheric pressure difference between an inside and outside of a car acts.
8. The railcar bodyshell according to claim 1 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
9. The railcar bodyshell according to claim 8 , wherein at least one of the inside plate, the outside plate, and the coupling plates in the hollow section arranged so as to correspond to at least one of the cantrail and the pier panel among the plurality of hollow sections has different plate thicknesses at a plurality of positions when viewed from the car longitudinal direction.
10. The railcar bodyshell according to claim 2 , wherein the harmonica configured structural portion is arranged at at least one of the car width direction middle portion of the roof bodyshell, the middle portion of the cantrail, and the pier panel of the side bodyshell.
11. The railcar bodyshell according to claim 5 , wherein when viewed from the car longitudinal direction, two or more coupling plates adjacent to each other in the circumferential direction of the car body among the plurality of coupling plates arranged in the harmonica configured structural portion extend in directions intersecting with each other.
12. The railcar bodyshell according to claim 11 , wherein when viewed from the car longitudinal direction, the two or more coupling plates adjacent to each other extend in parallel with directions in which shear force generated by an atmospheric pressure difference between an inside and outside of a car acts.
13. The railcar bodyshell according to claim 2 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
14. The railcar bodyshell according to claim 3 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
15. The railcar bodyshell according to claim 4 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
16. The railcar bodyshell according to claim 5 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
17. The railcar bodyshell according to claim 6 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
18. The railcar bodyshell according to claim 7 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
19. The railcar bodyshell according to claim 10 , wherein:
the side bodyshell and the roof bodyshell include a plurality of hollow sections;
each of the plurality of hollow sections includes
an inside plate arranged at a car interior side of the car body,
the coupling plates; and
an outside plate arranged at a car exterior side of the car body and coupled to the inside plate by the coupling plates such that plate surfaces of the inside and outside plates are spaced apart from each other; and
in the plurality of hollow sections, the inner wall is formed by coupling the plurality of inside plates, and the outer wall is formed by coupling the plurality of outside plates.
20. The railcar bodyshell according to claim 15 , wherein at least one of the inside plate, the outside plate, and the coupling plates in the hollow section arranged so as to correspond to at least one of the cantrail and the pier panel among the plurality of hollow sections has different plate thicknesses at a plurality of positions when viewed from the car longitudinal direction.