Collision energy absorbing device of railcar

1. A collision energy absorbing device of a railcar, the collision energy absorbing device comprising:

at least one outside plate constituting an outer tube having an axis extending in a car longitudinal direction; and

at least one partition plate extending in the car longitudinal direction in an internal space surrounded by the at least one outside plate, the at least one partition plate being fixed to the outside plate and dividing the internal space, the at least one partition plate including:

vertical and horizontal partition plates that: (i) intersect each other, (ii) include respective opposing slits fitted to each other, and (iii) are joined to each other by welding with the opposing slits fitted to each other, and

an end portion located at an end of the at least one partition plate in a direction perpendicular to the axis, the end portion being sandwiched by the at least one outside plate and constituting a part of the outer tube.

2. The collision energy absorbing device according to claim 1 , wherein:

the at least one outside plate comprises a plurality of outside plates; and

the end portion of the at least one partition plate is sandwiched by opposing end edges of the plurality of outside plates.

3. The collision energy absorbing device according to claim 1 , wherein:

the end portion of the at least one partition plate projects outward beyond an outer surface of the at least one outside plate; and

the end portion of the at least one partition plate and the outer surface of the at least one outside plate are joined to each other by welding.

4. The collision energy absorbing device according to claim 3 , further comprising a front plate facing a front end of the outer tube, wherein:

a front end of the end portion of the at least one partition plate contacts the front plate from behind;

a projection amount of a front end region of the end portion of the at least one partition plate from the outer surface of the at least one outside plate decreases as the front end region extends forward; and

a front end portion of the outer tube and the front plate are joined to each other by welding from outside.

5. The collision energy absorbing device according to claim 1 , wherein:

a slot is formed at a position of the at least one outside plate, the position being separated from a front end of the at least one outside plate in a car longitudinal direction;

the end portion of the at least one partition plate is inserted into the slot; and

the end portion of the at least one partition plate is sandwiched by the at least one outside plate and is separated in a rearward direction from the front end of the at least one outside plate.

6. A collision energy absorbing device of a railcar, the collision energy absorbing device comprising:

at least one outside plate constituting an outer tube having an axis extending in a car longitudinal direction; and

at least one partition plate extending in the car longitudinal direction in an internal space surrounded by the at least one outside plate, the at least one partition plate being fixed to the outside plate and dividing the internal space,

the at least one partition plate including an end portion located at an end of the at least one partition plate in a direction perpendicular to the axis, the end portion being sandwiched by the at least one outside plate, and constituting a part of the outer tube,

wherein:

a slot is formed at a position of the at least one outside plate, the position being separated from one of car longitudinal direction end edges of the at least one outside plate; and

the end portion of the at least one partition plate is inserted into the slot.

7. The collision energy absorbing device according to claim 6 , wherein the end portion of the at least one partition plate is sandwiched by the at least one outside plate and is separated in a rearward direction from the front end of the at least one outside plate.