Technical Field
[0001]
The present invention relates to a railway vehicle and
a method for manufacturing the railway vehicle.
Background Art
[0002]
A railroad vehicle structure generally is formed of an
underframe forming a floor surface, side structures each
erected at an end portion in a width direction of the
underframe and forming a side surface, end structures each
erected at an end portion in a longitudinal direction of the
underframe, and a roof structure provided above the side
structures and the end structures. In recent years, for the
purpose of weight reduction and improvement of
manufacturability, a method of constituting the roof
structure, the side structures, the underframe, and the like,
using an aluminum alloy-made hollow extruded shape material
constituted of two facing face plates and a plurality of
ribs connecting these face plates to each other, and
assembling the roof structure, the side structures, the
3
underframe, and the like into the railroad vehicle structure
has been spreading.
[0003]
Since air conditioning ducts and underfloor equipment
are densely disposed in an upper space and a lower space of
the underframe of the railroad vehicle structure, there is
a problem of how to secure rigidity and strength against
airtight pressure by the hollow shape material that avoids
interference with the air conditioning ducts and the
underfloor equipment. As a technique for solving this
problem, PTL 1 discloses that in a railroad vehicle structure
constituted of a roof structure constituting an upper surface,
side structures constituting side surfaces, end structures
constituting end surfaces in a longitudinal direction, and
an underframe constituting a lower surface, the underframe
is constituted of two face plates and a hollow shape material
constituted of a rib connecting the face plates, and a
thickness of a hollow shape material constituting a central
portion in a width direction of the underframe is made larger
than a thickness of a hollow shape material constituting end
portions in the width direction of the underframe.
Citation List
Patent Literature
[0004]
PTL 1: JP 2017-121824 A
4
Summary of Invention
Technical Problem
[0005]
Conventionally, the underframe constituting the floor
surface of the railroad vehicle structure on which a
relatively large airtight load acts when the railroad vehicle
structure passes through a tunnel at a high speed is
constituted of a central underframe disposed in a central
portion of the underframe in the longitudinal direction and
end underframes connected to both end portions of this
central underframe in the longitudinal direction.
[0006]
Since a compressive load and a tensile load between
the vehicles act on the railroad vehicle structure via a
pair of middle beams in which a coupler is accommodated, it
is convenient that the end underframes are constituted of
the hollow shape material extruded in the longitudinal (rail)
direction of the railroad vehicle structure.
[0007]
On the other hand, in order to mainly resist a load of
the equipment provided under the floor of the railroad
vehicle structure and the airtight load, the central
underframe needs to have a high rigidity along a width (tie)
direction of the railroad vehicle structure. Therefore, the
5
central underframe is constituted by combining an airtight
floor formed by integrally extruding a plurality of
reinforcing ribs having a substantially T-shaped crosssectional
shape on a flat plate, and a plurality of cross
beams that have a substantially I-shaped cross section and
are formed by extruding the reinforcing ribs in the tie
direction below this airtight floor.
[0008]
However, in the central underframe, it is necessary to
weld the plurality of cross beams to side surfaces of a pair
of side beams laid along the longitudinal direction of the
underframe at both end portions in the width direction of
the underframe, and there is a problem to be solved in terms
of manufacturability in addition to a large number of
components.
[0009]
An object of the present invention is to provide a
railway vehicle having a sufficient rigidity against an
airtight load and a sufficient space in which an electrical
component and the like can be mounted below an underframe,
and a method for manufacturing the railway vehicle.
Solution to Problem
[0010]
In order to achieve the above object, in one of
6
representative railway vehicles of the present invention,
an underframe constituting a floor surface of the
railway vehicle includes:
a central underframe having a hollow shape material
extruded in a width direction of the railway vehicle; and
a pair of end underframes each having a hollow shape
material extruded in a longitudinal direction of the railway
vehicle and connected to the central underframe on both sides
sandwiching the central underframe.
Advantageous Effects of Invention
[0011]
According to the present invention, there can be
provided a railway vehicle having a sufficient rigidity
against an airtight load and a sufficient space in which an
electrical component and the like can be mounted below an
underframe, and a method for manufacturing the railway
vehicle.
Problems, constitutions, and effects other than those
described above will be clarified by the following
description of embodiments.
Brief Description of Drawings
[0012]
[FIG. 1] FIG. 1 is a side view of a railroad vehicle.
7
[FIG. 2] FIG. 2 is a view of an underframe forming a
floor surface of the railroad vehicle as viewed from below
(cross-sectional view taken along line A-A of FIG. 1).
[FIG. 3] FIG. 3 is a cross-sectional view intersecting
a longitudinal direction of a central underframe (crosssectional
view taken along line B-B in FIG. 2).
[FIG. 4] FIG. 4 is an enlarged cross-sectional view of
a connection portion between a side beam and a central floor
material that form the central underframe of a first
embodiment (enlarged view of a portion D in FIG. 3).
[FIG. 5] FIG. 5 is an enlarged cross-sectional view of
a connection portion between a side beam and a central floor
material that form a central underframe of a second
embodiment, the view corresponding to the enlarged view of
the portion D in FIG. 3.
[FIG. 6] FIG. 6 is an enlarged cross-sectional view of
a connection portion between a side beam and a central floor
material that form a central underframe of a third embodiment,
the view corresponding to the enlarged view of the portion
D in FIG. 3.
[FIG. 7] FIG. 7 is a cross-sectional view of a cross
beam connecting an end underframe and the central underframe,
the cross-sectional view intersecting a width direction of
the underframe (cross-sectional view taken along line C-C in
FIG. 2).
8
[FIG. 8] FIG. 8 is a view schematically illustrating
a process for manufacturing the central floor material of
the central underframe forming the underframe.
[FIG. 9] FIG. 9 is a view schematically illustrating
each unit in an exploded state when the underframe is totally
assembled.
[FIG. 10] FIG. 10 is a flowchart illustrating a process
for manufacturing the underframe.
Description of Embodiments
[0013]
Hereinafter, embodiments of the present invention will
be described with reference to the drawings. First, a
railway vehicle is a general term for vehicles operated along
a laid track, and indicates a railroad vehicle, a monorail
vehicle, a new transportation system, and the like.
Hereinafter, as a representative example of the railway
vehicle, a railroad vehicle that travels at a high speed
will be described.
[0014]
Next, directions in the respective drawings are
defined. A longitudinal (rail) direction of the railroad
vehicle is an x direction, a width (tie) direction of the
railroad vehicle is a y direction, and a height direction of
the railroad vehicle intersecting the x direction and the y
9
direction is a z direction. Hereinafter, it may be referred
to as an x direction, a y direction, and a z direction.
[0015]
FIG. 1 is a side view of a railroad vehicle. A railroad
vehicle 1 is generally a hexahedron formed of an underframe
10 forming a floor surface, side structures 20 erected at
both end portions in the y direction of the underframe, end
structures (not illustrated) erected at both end portions in
the x direction of the underframe 10, and a roof structure
40 placed on upper end portions of the side structures 20
and the end structures. The side structures 20 each include
a plurality of windows 22, entrances 24 through which
passengers and the like get on and off, and the like.
[0016]
The railroad vehicle 1 is supported by a truck 7 having
wheels below both end portions in the x direction, and the
wheels constituting the truck 7 roll on an upper surface of
the track 5 along the track 5.
[0017]
FIG. 2 is a view of the underframe forming the floor
surface of the railroad vehicle as viewed from below (crosssectional
view taken along line A-A of FIG. 1). The
underframe 10 is formed of a central underframe 10a provided
in a central portion in the x direction of the underframe
10, and end underframes 10b provided at both end portions in
10
the x direction of the central underframe 10a.
[0018]
A pair of side beams 11 provided along the x direction
at both the end portions in the y direction of the underframe
10 is provided in a manner of connecting from one end beam
12 provided at one end portion in the x direction of the end
underframe 10b to another end beam 12 provided at another
end portion in the x direction of the end underframe 10b
across both the pair of end underframes 10b and the central
underframe 10a. That is, each of the side beams 11 extends
from the front end to the rear end of the underframe 10.
[0019]
Each of the end underframes 10b is formed of an end
floor material 15b formed of a hollow shape material extruded
in the x direction, the end beam 12 provided at an end edge
in the x direction of the end floor material 15b, the pair
of side beams 11 provided at end edges in the y direction of
the end floor material 15b, a cross beam 16, and a pair of
middle beams 13 connecting the end beam 12 and a body bolster
14. Referring to FIG. 7,the end floor material 15b has an
upper face plate 15bu, a lower face plate 15bd disposed
substantially in parallel to the upper face plate 15bu, and
a plurality of connection ribs 15bc connecting the upper
face plate 15bu and the lower face plate 15bd.
[0020]
11
A coupler (not illustrated) that couples the railroad
vehicle is accommodated between the pair of middle beams 13.
Since a large compressive load and a tensile load acting on
the railroad vehicle act on the middle beams 13 via the
coupler, the end underframe 10b including the middle beams
13 is required to have a high rigidity in the x direction.
Therefore, the end underframe 10b includes the end floor
material 15b formed of the hollow shape material extruded in
the x direction.
[0021]
On the other hand, the central underframe 10a is
required to be able to withstand a weight of an electrical
component and the like provided below the central underframe
10a, and an airtight load, and thus is desired to have a
high rigidity in the y direction. Therefore, the central
underframe 10a is constituted of a central floor material
15a formed of the hollow shape material extruded in the y
direction, and the side beams 11 provided with both end
portions in the y direction of the central floor material
15a arranged along the x direction.
[0022]
FIG. 3 is a cross-sectional view intersecting the
longitudinal direction of the central underframe (crosssectional
view taken along line B-B in FIG. 2), and
illustrates only one side from a center line 70 toward the
12
side structure 20 (side beam 11). The side beam 11 along
the x direction is provided at an end portion in the y
direction of the underframe 10, and the side structure 20 is
connected to an upper end portion of the side beam 11. The
pair of side structures 20 is connected by the central floor
material 15a formed of the hollow shape material extruded in
the y direction.
[0023]
Above the central floor material 15a, a duct 64 through
which conditioned air generated by an air conditioner (not
illustrated), recirculated air circulating from a vehicle
interior to the air conditioner, and the like flow, and an
upper floor support member 63 that supports an upper floor
60 on which seats and the like (not illustrate) are disposed
are provided. A side interior material 65 is provided on a
vehicle interior side of the side structure 20 from an end
portion in the y direction of the upper floor 60 toward the
z direction. An electrical component 88 and the like are
provided below the central floor material 15a.
[0024]
The central floor material 15a is constituted of the
hollow shape material (double skin shape material) extruded
in the y direction, by which a plurality of cross beams
constituting the conventional central underframe can be
omitted, and a sufficient space including the electrical
13
component 88 and the like can be secured below the central
underframe 10a.
[0025]

FIG. 4 is an enlarged cross-sectional view of a
connection portion between a side beam forming a central
underframe and a central floor material of a first embodiment
(enlarged view of a portion D in FIG. 3). The side beam 11
is constituted of the hollow shape material extruded along
the x direction, and includes a vehicle exterior side face
plate 11a, a vehicle interior side face plate 11b placed
substantially in parallel to the vehicle exterior side face
plate 11a, and a plurality of connection ribs 11c connecting
these two face plates.
[0026]
Furthermore, a pair of locking portions 11e that locks
the central floor material 15a is integrally formed on the
vehicle interior side face plate 11b of the side beam 11 by
extrusion. The pair of locking portions 11e is provided in
the vicinity of joint portions between the vehicle interior
side face plate 11b and the connection ribs 11c. The
connection ribs 11c may be provided in an inclined manner or
in a horizontal manner. FIG. 4 shows an example in which
the connection rib 11c (connection horizontal rib 11ch)
provided in a horizontal manner is connected to the vehicle
14
exterior side face plate 11a and the vehicle interior side
face plate 11b, and an end portion thereof is connected to
a vicinity of the locking portion 11e on a lower side.
[0027]
The central floor material 15a includes an upper face
plate 15au, a lower face plate 15ad, and a plurality of
connection ribs 15ac connecting these two face plates.
[0028]
When each of the end portions in the y direction of
the central floor material 15a abuts against the vehicle
interior side face plate 11b of the side beam 11 so as to be
engaged between the pair of locking portions 11e, the upper
face plate 15au and the lower face plate 15ad of the central
floor material 15a are joined to the vicinities of the joint
portions between the vehicle interior side face plate 11b of
the side beam 11 and the connection ribs 11c (the upper face
plate 15au or the lower face plate 15ad, and at least a part
of the joint portion overlap when viewed in the horizontal
direction).
Moreover, when the side beam 11 includes the connection
horizontal rib 11ch, the lower face plate 15ad of the central
floor material 15a abuts on the vicinity of the joint portion
with the vehicle interior side face plate 11b in a manner of
being located on substantially the same plane as the
connection horizontal rib 11ch of the side beam 11 (at least
15
parts of the lower face plate 15ad and the connection
horizontal rib 11ch overlap when viewed in the horizontal
direction). Moreover, the upper face plate 15au of the
central floor material 15a abuts on the vicinity of the joint
portion between the connection rib 11c and the vehicle
interior side face plate 11b (at least the upper face plate
15au and a part of the joint portion overlap when viewed in
the horizontal direction).
[0029]
For example, when the railroad vehicle 1 passes through
a tunnel at a high speed, an airtight load 81 acts on the
railroad vehicle 1 due to a pressure difference between an
inside and an outside of the vehicle. According to the above
constitution, when a bending moment 81M is generated in a
direction in which the central floor material 15a is pushed
down by the airtight load 81 acting on the railroad vehicle
1, so that the lower face plate 15ad is compressed, the upper
face plate 15au and the lower face plate 15ad are joined to
the vicinities of the joint portions between the vehicle
interior side face plate 11b of the side beam 11 and the
connection ribs 11c. Therefore, the connection ribs 11c of
the side beam 11 resists the load applied to the side beam
11 by the central floor material 15a, which can suppress
excessive deformation of the vehicle interior side face plate
11b of the side beam 11, so that the underframe 10 having a
16
high strength (rigidity) can be provided.
Further, when the side beam 11 includes the connection
horizontal rib 11ch, the connection horizontal rib 11ch
provided on the same plane as the lower face plate 15ad
resists the load of the lower face plate 15ad pressing the
side beam 11, which can suppress excessive deformation of
the vehicle interior side face plate 11b of the side beam
11, so that the underframe 10 having a high strength
(rigidity) can be provided.
[0030]

FIG. 5 is an enlarged cross-sectional view of a
connection portion between a side beam and a central floor
material that form a central underframe of a second
embodiment, and corresponds to an enlarged view of the
portion D in FIG. 3). A description of sections and
functions common to the first embodiment will be omitted,
and specific constitutions and functions of the second
embodiment will be focused on and described.
[0031]
In the second embodiment, a central floor material
supporting portion 18 is provided on a vehicle interior side
(side of the center line 70 in FIG. 3) of the side beam 11
integrally with the vehicle interior side face plate 11b by
extrusion. The central floor material supporting portion 18
17
includes a first inclined plate 11g and a second inclined
plate 11h, and has a substantially triangular tubular shape
extending in the x direction formed of the first inclined
plate 11g, the second inclined plate 11h, and the vehicle
interior side face plate 11b.
[0032]
One end of each of the first inclined plate 11g and
the second inclined plate 11h is connected to a vicinity of
a connection portion between the two connection ribs 11c and
the vehicle interior side face plate 11b (the end portion
and at least a part of the connection portion overlap when
viewed in the horizontal direction). Another end portion of
the first inclined plate 11g is connected to another end
portion of the second inclined plate 11h. The locking
portion 11e is integrally provided at a connection portion
between the end portion of the first inclined plate 11g and
the end portion of the second inclined plate 11h.
[0033]
The upper face plate 15au of the central floor material
15a is joined to the connection portion between the one end
portion of the first inclined plate 11g and the vehicle
interior side face plate 11b, and the lower face plate 15ad
of the central floor material 15a is joined to the locking
portion 11e of a joint portion between the first inclined
plate 11g and the second inclined plate 11h. The locking
18
portion 11e is shifted toward the center line 70 side with
respect to the connection portion between the one end portion
of the first inclined plate 11g and the vehicle interior
side face plate 11b. On the other hand, the end portion in
the y direction of the upper face plate 15au of the central
floor material 15a is shifted to a side beam 11 side with
respect to the end portion in the y direction of the lower
face plate 15ad. Therefore, the central floor material 15a
can be easily assembled to the side beam 11.
[0034]
According to this constitution, when the bending
moment 81M is generated in the direction in which the central
floor material 15a is pushed down by the airtight load 81
acting on the railroad vehicle 1, so that the lower face
plate 15ad is compressed, the first inclined plate 11g and
the second inclined plate 11h that support the lower face
plate 15ad resist a load by the lower face plate 15ad
pressing the side beam 11. Therefore, excessive deformation
of the vehicle interior side face plate 11b of the side beam
11 can be suppressed, so that the underframe 10 having a
high strength (rigidity) can be provided.
[0035]
Furthermore, the rigidity in the x direction of the
underframe 10 can be enhanced by the central floor material
supporting portion 18 provided integrally with the side beam
19
11 in the x direction.
[0036]
FIG. 6 is an enlarged cross-sectional view of a
connection portion between a side beam and a central floor
material that form a central underframe of a third embodiment,
and corresponds to an enlarged view of the portion D in FIG.
3. A description of sections and functions common to the
first embodiment and the second embodiment will be omitted,
and specific constitutions and functions of the third
embodiment will be focused on and described.
[0037]
The third embodiment is an example in which the central
floor material supporting portion 18 is constituted as a
separate component independent of the side beam 11 and
extruded in the x direction. The central floor material
supporting portion 18 is constituted of a first face plate
18a along the z direction, a second face plate 18b provided
substantially in parallel to the first face plate 18a, and
a plurality of connection face plates 18c1 to 18c3 and a
connection horizontal face plate 18ch that connect both the
first and second face plates. Locking portions 18g that
lock the central floor material 15a are provided at both end
portions of the second face plate 18b in the z direction.
[0038]
An upper end portion in the z direction of the first
20
face plate 18a of the central floor material supporting
portion 18 is connected to one of the locking portions 11e
provided on the vehicle interior side face plate 11b of the
side beams 11, and a lower end portion in the z direction of
the first face plate 18a is connected to the other locking
portion 11e provided on the vehicle interior side face plate
11b of the side beam 11.
[0039]
When the end portion in the y direction of the central
floor material 15a is caused to abut on the second face plate
18b of the central floor material supporting portion 18, the
upper face plate 15au of the central floor material 15a is
located on substantially the same plane as the connection
horizontal face plate 18ch forming the central floor material
supporting portion 18 (the upper face plate 15au and at least
a part of the connection horizontal face plate 18ch overlap
when viewed in the horizontal direction).
[0040]
With this constitution, when the airtight load 81 acts
on the railroad vehicle 1, the central floor material 15a is
pushed down, the tensile load acts on the upper face plate
15au, and the bending moment 81M is generated in the
direction in which the compressive load acts on the lower
face plate 15ad, the connection horizontal face plate 18ch
forming the central floor material supporting portion 18 can
21
resists a load in which the upper face plate 15au is pulled
toward the center line 70 (see FIG. 3), and the connection
face plates 18c2 and 18c3 forming the central floor material
supporting portion 18 can resist the load in which the lower
face plate 15ad presses the side beam 11.
[0041]
According to the present embodiment, it is possible to
provide the underframe 10 having a high strength (rigidity)
by suppressing excessive deformation of the central floor
material supporting portion 18. Further, there is an
advantage by constituting the central floor material
supporting portion 18 as a separate component independent of
the side beam 11 in place of being constituted integrally
with the side beam 11 by extrusion. In the side beam 11 in
a portion constituting each of the end underframes 10b having
a sufficient rigidity in the x direction, the central floor
material supporting portion 18 may be unnecessary. In such
a case, for example, as in the above-described embodiments,
when the side beam 11 and the central floor material
supporting portion 18 are integrally formed by extrusion,
working of removing the extra central floor material
supporting portion 18 is performed for weight reduction,
corresponding to the end underframe 10b, which requires manhours.
As in the present embodiment, if the central floor
material supporting portion 18 having a short length in the
22
x direction is attached to the side beam 11 as a separate
component, a number of manufacturing steps of the underframe
can be reduced.
[0042]
In order to reduce the weight, a central floor material
supporting portion 18 in which the connection face plate
18c1 of the central floor material supporting portion 18 is
omitted, and a dimension in a height direction of the first
face plate 18a is set to a dimension from the connection
horizontal face plate 18ch to a lower end portion of the
connection face plate 18c3 may be adopted.
[0043]
FIG. 7 is a cross-sectional view of the cross beam
connecting the end underframe and the central underframe,
the cross-sectional view intersecting the width direction of
the underframe (cross-sectional view taken along line C-C in
FIG. 2). The cross beam 16 is provided closer to a central
portion in the x direction of the underframe 10 in the end
underframe 10b, and is used to connect the end underframe
10b and the central underframe 10a.
[0044]
The cross beam 16 is a member formed of a hollow shape
material formed by extrusion in the y direction, and
integrally includes a rectangular cross-sectional shape in
an upper portion and a substantially trapezoidal cross23
sectional shape in a lower portion. Therefore, an xdirection
dimension L2 of a lower end portion of the cross
beam 16 is set larger than an x-direction dimension L1 of an
upper end portion of the cross beam 16. Locking portions
16f that lock an end portion in the x direction of the end
floor material 15b constituting the end underframe 10b are
provided in the upper portion of the cross beam 16, and
locking portions 16e that lock an end portion in the x
direction of the central floor material 15a constituting the
central underframe 10a are provided in the lower portion of
the cross beam 16. Of the pair of locking portions, the
locking portion 16e on a lower side in the z direction is
shifted toward a central underframe 10a side with respect to
the locking portion 16e on an upper side in the z direction.
On the other hand, an end portion in the x direction of the
upper face plate 15au of the central floor material 15a is
shifted toward a cross beam 16 side with respect to an end
portion in the x direction of the lower face plate 15ad.
[0045]
With this constitution, when the underframe 10 is fully
assembled, after joining the pair of end underframes 10b and
the pair of side beams 11, only by placing the central floor
material 15a on the cross beam 16 while hanging down from
above, the end portions of the upper face plate 15au and the
lower face plate 15ad of the central floor material 15a can
24
be connected to the two locking portions 16e of each of the
cross beams 16.
[0046]
With the above constitution, in particular, it is
possible to provide a railroad vehicle including the
underframe 10 having a sufficient rigidity against an
airtight load and the like by using an extruded shape
material in which the extrusion direction is the y direction
while the central underframe 10a can be manufactured with a
small number of components. Furthermore, according to the
above constitution, since the plurality of cross beams
constituting the conventional central underframe are not
used, a height-direction dimension of the central underframe
can be reduced, so that it is possible to provide a railroad
vehicle having a sufficient space in which an electrical
component and the like can be mounted below the underframe.
[0047]

FIG. 8 is a view schematically showing a process for
manufacturing the central floor material of the central
underframe forming the underframe. Here, after the hollow
extruded shape materials are arranged side by side on a
surface plate, these shape materials are joined to
manufacture a panel on which the central floor material 15a
is based. At this time, an extrusion-direction dimension of
25
the hollow extruded shape material is a dimension obtained
by adding a machining allowance dimension α to an x-direction
dimension L1 of the central floor material 15a when the
central floor material 15a is incorporated in the underframe
10 (FIG. 8 (a)).
[0048]
Next, this panel is cut into four panels A to D
(exemplified) by an extrusion-direction dimension W1 in a
direction intersecting the extrusion direction. This
dimension W1 is a y-direction dimension of the central floor
material 15a when the central floor material 15a is
incorporated in the underframe 10 (FIG. 8 (b)).
[0049]
Next, the cut panels A to D are arranged on the surface
plate side by side with the extrusion direction aligned in
a direction intersecting the extrusion direction of the
hollow extruded shape material (FIG. 8(c)), and then the
panels A to D are joined by welding to manufacture the
central floor material 15a having the y-direction dimension
W1 and the x-direction dimension L1.
[0050]
FIG. 9 is a view schematically illustrating each unit
in an exploded state when the underframe is totally assembled,
and FIG. 10 is a flowchart illustrating a process for
manufacturing the underframe. Hereinafter, the process of
26
assembling the underframe 10 will be described step by step.
[0051]
In step S10, assembly of the underframe 10 starts.
In step S20, two structures corresponding to the end
underframes 10b each formed of the end beam 12, the cross
beam 16, the end floor material 15b, the body bolster 14,
and the middle beam 13 are prepared.
In step S30, as illustrated in FIG. 8, one structure
corresponding to the central underframe 10a formed of the
central floor material 15a having the total length L1 (xdirection
dimension) is prepared.
In step S40, the two side beams 11 each having a total
length L0 (x-direction dimension) are prepared.
In step S50, the structures corresponding to the end
underframes 10b and the side beams 11 are connected to
manufacture a framework of the underframe 10 having the total
length L0. As a result, the framework of the underframe 10
having a rectangular space surrounded by the structures
corresponding to the end underframes 10b and the side beams
11 is produced.
In step S60, the central floor material 15a having the
total length L1 (x-direction dimension) is joined to the
framework of the underframe 10 manufactured in step S50 to
complete the underframe 10 having the total length L0.
In step S70, the assembly of the underframe 10 ends.
27
[0052]
Note that the structures corresponding to the end
underframes 10b or the structure corresponding to the central
underframe 10a may be manufactured by out-work at a place
other than a work place where the underframe 10 is assembled.
[0053]
Moreover, although not illustrated, the underframe 10
may be manufactured by a manufacturing method including a
step of assembling the frame body from the end beams 12, the
body bolsters 14, the middle beams 13, the cross beams 16,
which form the end underframes 10b, and the side beams 11,
and a step of assembling the end floor materials 15b and the
central floor material 15a to the frame body.
[0054]
The underframe 10 totally assembled by the above
manufacturing method makes it possible to provide a railroad
vehicle including the underframe 10 having a sufficient
rigidity against an airtight load and the like using the
extruded shape material having the extrusion direction in
the y direction. Furthermore, according to the above
constitution, since the plurality of cross beams
constituting the conventional central underframe are not
used, the height-direction dimension of the central
underframe can be reduced, so that it is possible to provide
a railroad vehicle having a sufficient space in which an
28
electrical component and the like can be mounted below the
underframe.
[0055]
Note that the present invention is not limited to the
above-described embodiments, but includes various
modifications other than the above-described embodiments.
For example, the above-described embodiments have been
described in detail in order to describe the present
invention in an easy-to-understand manner, and are not
necessarily limited to those having all the constitutions
described. Moreover, a part of the constitution of one of
the embodiments can be replaced with the constitution of the
other embodiment, and the constitution of one of the
embodiments can also be added to the constitution of the
other embodiment. Moreover, for a part of the constitution
of each of the embodiments, addition, deletion, or
replacement of another constitution can be made.
Reference Signs List
[0056]
1 railroad vehicle
5 track
7 truck
10 underframe
10a central underframe
10b end underframe
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11 side beam
11a vehicle exterior side face plate
11b vehicle interior side face plate
11c connection rib
11ch connection horizontal rib
11e locking portion
11g first inclined plate
11h second inclined plate
12 end beam
13 middle beam
14 body bolster
15a central floor material
15au upper face plate
15ac connection rib
15ad lower face plate
15b end floor material
15bu upper face plate
15bc connection rib
15bd lower face plate
16 cross beam
16e, 16f locking portion
18 central floor material supporting portion
18a first face plate
18b second face plate
18c1 to 18c3 connection face plate
30
18ch connection horizontal face plate
18e locking portion
20 side structure
22 window
24 entrance
40 roof structure
60 upper floor
63 upper floor support member
64 duct
65 side interior material
70 center line (vehicle body width direction)
81 airtight load
81M bending moment
88 electrical component
L0 x-direction (total-length) dimension of underframe 10
(side beam 11)
L1 x-direction (total length) dimension of central
underframe 10a
x longitudinal (rail) direction
y width (tie) direction
z height direction

WE CLAIM:
[Claim 1]
A railway vehicle, wherein
an underframe constituting a floor surface of the
railway vehicle includes:
a central underframe having a hollow shape material
extruded in a width direction of the railway vehicle; and
a pair of end underframes each having a hollow shape
material extruded in a longitudinal direction of the railway
vehicle and connected to the central underframe on both sides
sandwiching the central underframe.
[Claim 2]
The railway vehicle according to claim 1, wherein
the central underframe includes a central floor
material constituted of the hollow shape material formed of
an upper face plate, a lower face plate disposed
substantially in parallel to the upper face plate, and a
plurality of connection plates connecting the upper face
plate and the lower face plate, and
each of the end underframes includes an end floor
material constituted of the hollow shape material formed of
an upper face plate, a lower face plate disposed
substantially in parallel to the upper face plate, and a
plurality of connection plates connecting the upper face
plate and the lower face plate.
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[Claim 3]
The railway vehicle according to claim 2, wherein
the underframe includes a pair of side beams provided
along a longitudinal direction of the railway vehicle at
both end portions in a width direction of the railway vehicle,
and
each of the side beams extends across the central
underframe and the end underframes from a front end of one
of the end underframes to a rear end of the other end
underframe.
[Claim 4]
The railway vehicle according to claim 3, wherein
the side beam includes a vehicle exterior side face
plate, a vehicle interior side face plate placed
substantially in parallel to the vehicle exterior side face
plate, and a plurality of connection ribs connecting the
vehicle exterior side face plate and the vehicle interior
side face plate, and
the upper face plate and the lower face plate of the
central floor material are connected to vicinities of joint
portions between the vehicle interior side face plate and
the connection ribs.
[Claim 5]
The railway vehicle according to claim 3, wherein
the side beam includes a vehicle exterior side face
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plate, a vehicle interior side face plate placed
substantially in parallel to the vehicle exterior side face
plate, a plurality of connection ribs connecting the vehicle
exterior side face plate and the vehicle interior side face
plate, and a central floor material supporting portion formed
by extrusion integrally with the vehicle interior side face
plate,
the central floor material supporting portion is
constituted of the vehicle interior side face plate, a first
inclined plate, and a second inclined plate, and has a
substantially triangular tubular shape extending in a
longitudinal direction of the underframe,
one end portion of each of the first inclined plate
and the second inclined plate is connected to a vicinity of
a connection portion between the vehicle interior side face
plate of the side beam and the corresponding connection rib
of the side beam,
another end portion of the first inclined plate and
another end portion of the second inclined plate are
connected, and
one end portion of the upper face plate of the central
floor material in a width direction of the underframe is
connected to a vicinity of the one end portion of the first
inclined plate, and one end portion of the lower face plate
of the central floor material in the width direction of the
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underframe is connected to a vicinity of the other end
portion of the first inclined plate.
[Claim 6]
The railway vehicle according to claim 3, wherein
the underframe includes a central floor material
supporting portion that connects the side beam and the
central floor material, and
the side beam includes a vehicle exterior side face
plate, a vehicle interior side face plate placed
substantially in parallel to the vehicle exterior side face
plate, and a plurality of connection ribs connecting the
vehicle exterior side face plate and the vehicle interior
side face plate,
the central floor material supporting portion includes
a first face plate placed substantially in parallel to the
vehicle interior side face plate of the side beam, a second
face plate placed substantially in parallel to the first
face plate, and a plurality of connection face plates
connecting the first face plate and the second face plate,
the upper face plate of the central floor material is
connected to an upper end portion of the second face plate,
the lower face plate of the central floor material is
connected to a lower end portion of the second face plate,
and
the corresponding connection face plate and the upper
35
face plate are disposed on substantially the same plane.
[Claim 7]
A method for manufacturing the railway vehicle
according to claim 1, comprising the steps of:
preparing the end underframes;
preparing a central floor material that forms the
central underframe;
preparing a side beam;
connecting the side beam to the end underframes; and
connecting the central floor material to the end
underframes and the side beam.
[Claim 8]
The method for manufacturing the railway vehicle
according to claim 7, wherein
the central floor material is formed by arranging and
joining extruded shape materials side by side in a direction
intersecting an extrusion direction while aligning an
extrusion direction, the extruded shape materials being
obtained by division along the extrusion direction.
[Claim 9]
The method for manufacturing the railway vehicle
according to claim 3, comprising the steps of:
assembling an end beam, a body bolster, a middle beam,
and a cross beam that form each of the end underframes, and
the side beam to a frame body; and
36
assembling the end floor materials and the central
floor material to the frame body.