Carbody of railcar
A carbody of a railcar includes a roof bodyshell, a side bodyshell, and a cantrail. The cantrail includes: an outside plate; an inside plate arranged at a car inner side of the outside plate and spaced apart from the outside plate; and a plurality of coupling rib plates coupled to the outside plate and the inside plate and forming a plurality of triangles together with the outside plate and the inside plate. Each of the outside plate and the inside plate includes a plurality of sections each connecting apexes of the triangle. The plurality of sections of at least one of the outside plate and the inside plate include a plurality of flat plate sections. In the at least one plate, two or more adjacent flat plate sections among the plurality of flat plate sections are arranged on a straight line.
1. A carbody of a railcar,
the carbody comprising:
a roof bodyshell;
a side bodyshell; and
a cantrail,
the roof bodyshell and the side bodyshell being connected to each other through the cantrail,
the cantrail including
an outside plate,
an inside plate arranged at a car inner side of the outside plate and spaced apart from the outside plate, and
a plurality of coupling rib plates coupled to the outside plate and the inside plate and forming a plurality of triangles of a truss shape together with the outside plate and the inside plate,
the outside plate and the inside plate each including a plurality of sections each connecting apexes of the plurality of triangles,
a plurality of flat plate sections being included in the plurality of sections of at least one of the outside plate and the inside plate,
among the plurality of flat plate sections of the at least one plate, two or more adjacent flat plate sections being arranged on a straight line,
each of the outside plate and the inside plate being provided with at least one bent point projecting toward a car outer side since two adjacent flat plate sections among the plurality of flat plate sections have respective angles,
as one of a plurality of apexes of the plurality of triangles, a maximum bent point projecting toward the car outer side being formed at the outside plate,
a car outer side angle of the outside plate at the maximum bent point being largest among car outer side angles of the outside plate at the plurality of apexes, and
a cross-sectional area of a region at the maximum bent point being larger than each of cross-sectional areas of regions at other bent points of the cantrail.
2. The carbody according to claim 1 , wherein:
the outside plate includes the plurality of flat plate sections;
two or more adjacent flat plate sections among the plurality of flat plate sections are arranged on a straight line at at least one of both adjacent sides of the maximum bent point of the outside plate; and
a portion of the inside plate which portion faces a car inner side of the maximum bent point is a flat plate section of the plurality of flat plate sections of the inside plate and an intermediate portion of the flat plate section facing the maximum bent point is not coupled to the maximum bent point.
3. The carbody according to claim 1 , wherein:
the number of bent points of the inside plate is larger than the number of bent points of the outside plate.
4. The carbody according to claim 1 , wherein the plurality of sections of the at least one plate includes the plurality of flat plate sections and at least one curved plate section.
5. The carbody according to claim 1 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
6. The carbody according to claim 2 , wherein:
the number of bent points of the inside plate is larger than the number of bent points of the outside plate.
7. The carbody according to claim 2 , wherein the plurality of sections of the at least one plate includes the plurality of flat plate sections and at least one curved plate section.
8. The carbody according to claim 3 , wherein the plurality of sections of the at least one plate includes the plurality of flat plate sections and at least one curved plate section.
9. The carbody according to claim 6 , wherein the plurality of sections of the at least one plate includes the plurality of flat plate sections and at least one curved plate section.
10. The carbody according to claim 2 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
11. The carbody according to claim 3 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
12. The carbody according to claim 4 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
13. The carbody according to claim 6 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
14. The carbody according to claim 7 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
15. The carbody according to claim 8 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
16. The carbody according to claim 9 , wherein:
each of the outside plate and the inside plate is provided with a linear portion formed by at least one of the flat plate sections; and
the linear portion that is longest among the linear portion of the outside plate and the linear portion of the inside plate is provided at the inside plate.
17. A carbody of a railcar,
the carbody comprising:
a roof bodyshell;
a side bodyshell; and
a cantrail,
the roof bodyshell and the side bodyshell being connected to each other through the cantrail,
the cantrail including
an outside plate,
an inside plate arranged at a car inner side of the outside plate and spaced apart from the outside plate, and
a plurality of coupling rib plates coupled to the outside plate and the inside plate and forming a plurality of triangles of a truss shape together with the outside plate and the inside plate,
the outside plate and the inside plate each including a plurality of sections each connecting apexes of the plurality of triangles,
a plurality of flat plate sections being included in the plurality of sections of at least one of the outside plate and the inside plate,
among the plurality of flat plate sections of the at least one plate, two or more adjacent flat plate sections being arranged on a straight line,
as one of a plurality of apexes of the plurality of triangles, a maximum bent point projecting toward a car outer side being formed at the outside plate;
a car outer side angle of the outside plate at the maximum bent point being largest among car outer side angles of the outside plate at the plurality of apexes; and
a cross-sectional area of a region at the maximum bent point being larger than each of cross-sectional areas of regions at apexes each located between adjacent flat plate sections arranged on a single straight line.