Title of invention: Rail vehicle
Technical field
[0001]
　The present invention relates to a rail vehicle.
Background technology
[0002]
　The rail vehicle structure, which is the structure of the rail vehicle, generally includes a roof structure that constitutes the upper surface, a side structure that constitutes the side surface, an underframe that constitutes the lower surface, and a wife structure that constitutes the end face in the longitudinal direction. In recent years, for the purpose of improving manufacturability and sound insulation, a hollow profile made of an aluminum alloy composed of two facing face plates and a plurality of ribs connecting the face plates has been used for roof structures, side structures, underframes, etc. The method of constructing and assembling into a rail vehicle structure is becoming widespread.
[0003]
　By applying the hollow profile to the rail vehicle structure, it is possible to secure the rigidity and strength required for the rail vehicle structure without arranging beam members and reinforcements in a complicated combination, which simplifies the production. In addition, since the receiver for attaching the equipment and interior members can be integrally molded with the hollow profile constituting the rail vehicle structure, there is no need to separately provide a receiver for the attachment portion of the equipment and interior members. Further simplification of production becomes possible.
[0004]
　For low- and medium-speed rolling stock represented by conventional line rolling stock, a rail rolling stock structure in which the roof structure, side structure, and underframe are all made of hollow profile as shown in FIG. 1 of Patent Document 1 has been put into practical use. ing. On the other hand, in a high-speed vehicle represented by a Shinkansen vehicle, as shown in FIG. 1 of Patent Document 2, the roof structure and the side structure are made of hollow lumber, and the underframe is made of a T-ribbed lumber and a plurality of beam members. A rail vehicle structure composed of a composite structure welded to the above is adopted.
[0005]
　As described above, the actual situation in which the underframe of the high-speed vehicle is not composed of the hollow profile will be described with reference to FIGS. 1 and 8. FIG. 1 is a perspective view of a railroad vehicle structure 1 of a high-speed vehicle, and FIG. 8 is a sectional view taken along the line AA of the railroad vehicle structure 1 of a high-speed vehicle shown in FIG.
[0006]
　In high-speed vehicles, it is necessary to keep the position of the center of gravity low in order to ensure stability at high speeds. Therefore, the air conditioner 7 having a relatively large mass is mounted under the underframe 4 (see FIG. 1), and the air supply duct 13, the return air duct 14, and the exhaust duct 13 between the underframe 4 and the floor plate 63 are mounted. Air is circulated throughout the longitudinal direction of the vehicle through the duct 20.
[0007]
　Here, since the position of the floor plate 63 in the height direction is determined so as not to cause a step with the platform of the station, the underframe 4 includes the air supply duct 13, the return air duct 14, and the exhaust duct. It needs to be placed below so as not to interfere with 20. On top of that, since the underfloor equipment is mounted below the underframe 4, the underframe 4 needs to have a structure that does not interfere with the underfloor equipment.
[0008]
　By the way, when a high-speed vehicle enters a tunnel, the pressure around the vehicle fluctuates greatly. Therefore, for the purpose of preventing passengers' ear clogging caused by the pressure fluctuation spreading inside the vehicle, the railway vehicle structure 1 of the high-speed vehicle 1 Has an airtight structure. Since a pressure difference is generated inside and outside the vehicle due to such an airtight structure, the railway vehicle structure 1 expands and contracts in the cross-sectional direction. This pressure difference is called airtight pressure.
[0009]
　On the other hand, the underframe 4 is flat in order to horizontally attach the floor plate 63 and the underfloor equipment. In general, a flat plate is structurally weaker than a curved plate with respect to a pressure acting in the out-of-plane direction, and is liable to cause excessive deformation or stress. Therefore, in order to reduce these deformations and stresses, the underframe 4 needs to have a structure having a sufficient moment of inertia of area and a cross-sectional coefficient.
[0010]
　In order to satisfy the above conditions, the underframe 4 of the high-speed vehicle uses a thin T-ribbed profile 61 for air conditioning such as an air supply duct 13, a return air duct 14, and an exhaust duct 20. It is intended to avoid interference with ducts and underfloor equipment. Further, by arranging the cross-section beam 62 having a height in the vertical direction of the vehicle at a position where it does not interfere with the underfloor equipment, it is intended to secure a sufficient moment of inertia of area and a section coefficient with respect to the airtight pressure.
[0011]
　That is, in the underframe of a high-speed vehicle, air-conditioning ducts and underfloor equipment are densely packed above and below the frame, so it is difficult to secure rigidity and strength against airtight pressure by using a hollow profile that avoids interference with them. It is in.
[0012]
　In order to solve this problem, the underframe is formed of a hollow profile in which the thickness of the central portion in the width direction is thicker than the thickness of the end portion in the width direction as shown in FIG. 2 of Patent Document 3, and the width of the underframe is formed. A rail vehicle structure that secures rigidity and strength against airtight pressure that generates a large bending load in the central part of the direction has been proposed.
[0013]
　In such a rail vehicle structure, by utilizing the inside of the hollow profile in the center of the width direction of the thickened underframe as a space for returning air, the length of the vehicle is not sacrificed in the space above and below the floor. Allows air to circulate in all directions. However, a thick hollow profile has a high degree of difficulty in manufacturing, and tends to be thicker and smaller than a general-thick hollow profile. This leads to an increase in the mass of the rail vehicle structure and an increase in manufacturing cost due to an increase in the amount of welding. Further, the internal use of the hollow profile as a space for returning air leads to an increase in manufacturing cost due to an increase in the processing amount of the hollow profile.
Prior art literature
Patent documents
[0014]
Patent Document 1: Japanese Patent No. 372507
Patent Document 2: Japanese Patent No. 4163925
Patent Document 3: Japanese Patent No. 6552971
Outline of the invention
Problems to be solved by the invention
[0015]
　In order to reduce the production cost of the rail vehicle, it is desirable to configure the rail vehicle structure with a hollow profile to simplify the production. However, in the underframe of high-speed vehicles, air-conditioning ducts and underfloor equipment are densely packed above and below, so the hollow profile that avoids interference with them ensures rigidity and strength against airtight pressure, while increasing mass. It is difficult to suppress the increase in manufacturing cost. In other words, the underframe of a high-speed vehicle is made of hollow profile material to avoid interference with air-conditioning ducts and underfloor equipment, while ensuring rigidity and strength against airtight pressure while suppressing mass increase and manufacturing cost increase. There is a problem to be solved in terms of doing so.
[0016]
　In the present invention, the underframe is constructed of a hollow profile material that suppresses an increase in mass and manufacturing cost while ensuring rigidity and strength against airtight pressure while avoiding interference with air conditioning ducts and underfloor equipment. By doing so, the purpose is to provide a rail vehicle that simplifies the production and reduces the production cost.
Means to solve problems
[0017]
　In order to solve the above problems, one of the typical rail vehicles according to the present invention is a roof structure constituting the upper surface, a side structure constituting the side surface, a wife structure constituting the end surface in the longitudinal direction, and a lower surface. It is a rail vehicle composed of an underframe constituting the underframe, and the underframe is composed of a
　hollow profile material composed of two face plates and ribs connecting the face plates to each other, and the hollow shape
　constituting the underframe. The materials are a first upper side plate arranged in the widthwise central portion of the underframe, a first lower side plate arranged in the widthwise central portion of the underframe, and a widthwise end of the underframe. A second upper side plate arranged in the portion and located below the first upper side plate, and a second arranged at the widthwise end of the underframe and located below the first lower side plate. A third upper side plate connecting the lower side plate, the first upper side plate and the second upper side plate, and a second connecting the first lower side plate and the second lower side plate. It has a lower side plate of 3, and a
　space is provided below the first lower side plate, and a closing plate for connecting the adjacent ends of the pair of the second lower side plates is arranged. Achieved by
Effect of the invention
[0018]
　According to the present invention, the underframe is constructed of a hollow profile material that suppresses an increase in mass and manufacturing cost while ensuring rigidity and strength against airtight pressure while avoiding interference with air conditioning ducts and underfloor equipment. By doing so, it is possible to provide a rail vehicle that simplifies the production and reduces the production cost.
　The configuration, action, and effect of the present invention other than those described above will be clarified by the following description of the embodiments.
A brief description of the drawing
[0019]
[Fig. 1] Fig. 1 is a perspective view of a railroad vehicle structure for a high-speed vehicle.
FIG. 2 is a vertical cross-sectional view of a general portion (AA portion) of the railway vehicle structure shown in FIG. 1 according to the embodiment of the present invention.
FIG. 3 is a vertical cross-sectional view of an air conditioner mounting portion (BB portion) of the railroad vehicle structure shown in FIG. 1 according to the embodiment of the present invention.
FIG. 4 is a vertical cross-sectional view of a blowing portion (CC portion) of the railroad vehicle structure shown in FIG. 1 according to the embodiment of the present invention.
FIG. 5 is a vertical cross-sectional view of a window portion (DD portion) of the railway vehicle structure shown in FIG. 1 according to the embodiment of the present invention.
FIG. 6 is a vertical cross-sectional view of a longitudinal end portion (EE portion) of the railway vehicle structure shown in FIG. 1 according to the embodiment of the present invention.
FIG. 7 is a vertical cross-sectional view of a general portion (AA portion) of the railway vehicle structure shown in FIG. 1 according to another embodiment of the present invention.
FIG. 8 is a vertical cross-sectional view of a general portion (AA portion) of the railway vehicle structure shown in FIG. 1 in the prior art.
Embodiment for carrying out the invention
[0020]
　Hereinafter, the rail vehicle according to the embodiment of the present invention will be described with reference to the drawings. The rail vehicle is a general term for vehicles operated along the laid track, and means a railroad vehicle, a road train, a new transportation system vehicle, a monorail vehicle, and the like. Here, an embodiment of the present invention will be described by exemplifying a railroad vehicle as a typical example of a rail vehicle with reference to the drawings.
[0021]
　[Embodiment]
　FIG. 1 is a perspective view schematically showing an example of a railroad vehicle structure. As shown in FIG. 1, the vertical (height) direction of the railway vehicle structure 1 is 101, and the width direction and the longitudinal direction orthogonal to the vertical direction are 102 and 103, respectively.
[0022]
　The railroad vehicle structure 1 includes side structures 3 and 3 (only one of which is shown) erected at both ends of the underframe 4 in the width direction 102, and a wife structure 5 erected at both ends of the underframe 4 in the longitudinal direction 103. 5 (only one is shown) and the roof structure 2 mounted on the upper end of the side structure 3, 3 and the wife structure 5, 5 in the vertical (height) direction 101. The side structures 3 and 3 are provided with an entrance / exit for passengers to get on and off, and a window 6 for passengers to see the scenery outside the vehicle. Below the underframe 4, an air conditioner 7 that circulates the air inside the vehicle is provided.
[0023]
　FIG. 2 shows a sectional view taken along the line AA of the railway vehicle structure 1 shown in FIG. The roof structure 2, the side structure 3, and the underframe 4 are formed by joining two facing face plates and a hollow profile made of an aluminum alloy composed of a plurality of ribs connecting the face plates. Further, the extrusion direction is set to the longitudinal direction 103 of the railway vehicle structure 1. Hereinafter, the configuration of the underframe 4 will be described in detail.
[0024]
　The position of the upper side plate 17 of the hollow profile constituting the upper surface of the central underframe 11 located at the center of the width direction 102 in the vertical direction 101 is the upper surface of the end underframe 12 located at the end of the width direction 102. It is higher than the position of the upper side plate 17 of the hollow profile constituting the above in the vertical direction 101. Further, the position of the lower side plate 18 of the hollow profile forming the lower surface of the central underframe 11 in the vertical direction 101 is the vertical direction 101 of the lower side plate 18 of the hollow profile forming the lower surface of the end underframe 12. Higher than the position of. The upper side plate 17 and the lower side plate 18 of the central underframe 11 and the end underframe 12 are respectively on a substantially horizontal plane. When the thicknesses of the central underframe 11 and the end underframe 12 are substantially the same, the hollow profile formed in the same process can be used for forming, so that the cost can be reduced.
[0025]
　The upper side plate 17 includes a first upper side plate 17a located on the upper surface of the central underframe 11, a second upper side plate 17b located on the upper surface of the end underframe 12, and a first upper side plate 17a and a second. It has a third upper side plate 17c that is smoothly connected to the upper side plate 17b. Further, the lower side plate 18 includes a first lower side plate 18a located on the lower surface of the central underframe 11, a second lower side plate 18b located on the lower surface of the end underframe 12, and a first lower surface plate 18. It has a third lower side plate 18c in which the side plate 18a and the second lower side plate 18b are smoothly connected. The second upper side plate 17b is located below the first upper side plate 17a, and the second lower side plate 18b is located below the first lower side plate 18a.
[0026]
　That is, the underframe 4 has a mode in which the end underframe 12 is biased downward with respect to the central underframe 11. The ends on the center side in the width direction 102 of the lower side plate 18 of the hollow profile forming the end underframe 12 (only one of them is shown) are connected by the closing plate 19, and the lower surface side of the central underframe 11 is shielded. Has been done.
[0027]
　The upper part of the end frame 12 (second upper side plate 17b, third upper side plate 17c, floor plate 63, floor plate support base 21, and side structure 3 for air supply space and return air surrounded by the inner surface of the vehicle). In the space), the air supply duct 13 for transporting air from the air conditioner 7 into the vehicle is on the end side in the width direction 102, and the return air duct 14 for transporting air from the vehicle interior to the air conditioner 7 is in the width direction 102. It is provided on the center side. The air supply duct 13 and the return air duct 14 extend along the longitudinal direction 103 of the railway vehicle structure 1, and the lower surface of the return air duct 14 is an end frame so that the space can be effectively used. It is along the upper side plate 17 from the portion 12 to the portion where the end frame 12 and the center frame 11 are smoothly connected. In other words, the cross section of the return air duct 14 has a pentagonal shape that matches the connecting portion between the end underframe 12 and the central underframe 11.
[0028]
　On the other hand, the air exhausted from the inside of the vehicle to the outside of the vehicle is carried by the lower side plate 18 (first lower side plate 18a and third lower side plate 18c) of the hollow profile constituting the central underframe 11 and the closing plate 19. This is done through the exhaust duct 20 provided in the space surrounded by. The exhaust duct 20 extends along the longitudinal direction 103 of the railroad vehicle structure 1, and the upper surface of the exhaust duct 20 is from the central underframe 11 to the central underframe 11 so that the space can be effectively utilized. Along the lower side plate 18 to the portion where the end frame 12 and the end frame 12 are smoothly connected. In other words, the cross section of the exhaust duct 20 has an equal leg base shape that matches the connecting portion between the end underframe 12 and the central underframe 11.
[0029]
　A floor plate is placed on the upper part of the upper side plate 17 (at least one of the first upper side plate 17a, the second upper side plate 17b, and the third upper side plate 17c) in the vicinity of the joint between the central underframe 11 and the end underframe 12. A support base 21 is provided, and a floor plate receiver 16 is provided inside the vehicle of the side structure 3. The central floor plate 22 is supported on a substantially horizontal plane by the floor plate support base 21 above the central underframe 11 and the return air duct 14. The end floor plate 23 is supported on a substantially horizontal plane by the floor plate support base 21 and the floor plate receiver 16 above the air supply duct 13 and the return air duct 14. The central floor plate 22 and the end floor plate 23 form a floor plate.
[0030]
　Since the end floor plate 23 is supported by the side structure 3, the vibration from the underframe 4 is less likely to be transmitted to the inside of the vehicle. The positions of the central floor plate 22 and the end floor plate 23 in the height direction 101 are substantially the same. Further, there is a gap 25 between the two, and a floor covering 24 is attached to the upper surface of the two.
[0031]
　A seat support base 32 is provided above the central floor plate 22 and the end floor plate 23, and a seat receiver 15 is provided inside the vehicle of the side structure 3. The seat 31 is supported on a substantially horizontal plane by the seat support base 32 and the seat receiver 15. An interior panel 33 (indicated by a broken line) is provided on the side surface of the seat 31 to improve the appearance of the inside of the vehicle. The gap 25 between the central floor plate 22 and the end floor plate 23 is located below the seat 31.
[0032]
　The BB sectional view of the railway vehicle structure 1 shown in FIG. 1 is shown in FIG. 3, the CC sectional view is shown in FIG. 4, the DD sectional view is shown in FIG. 5, and the EE sectional view is shown in FIG. 6, respectively. show. 3 is a vertical cross-sectional view of an air-conditioning mounting portion including an air-conditioning device 7, FIG. 4 is a vertical cross-sectional view of a blow-in portion between windows, FIG. 5 is a vertical cross-sectional view of a window portion, and FIG. 6 is a longitudinal end portion. Each shows a vertical cross-sectional view. Hereinafter, the air circulation in the vehicle according to the present embodiment will be described with reference to these figures.
[0033]
　In the air-conditioning mounting portion shown in FIG. 3, on the hollow profile constituting the end frame 12, the closing plate 19, the lower surface of the air supply duct 13, the lower surface of the return air duct 14, and the lower surface of the exhaust duct 20. , Each of which is provided with an opening penetrating in the vertical (height) direction 101.
[0034]
　The air supply 41 carried from the air conditioner 7 into the vehicle is supplied to the inside of the air supply duct 13 through the hollow profile constituting the end underframe 12 and the opening provided on the lower surface of the air supply duct 13. Further, it spreads over the entire longitudinal direction 103 of the railway vehicle structure 1 through the air supply duct 13.
[0035]
　On the other hand, the return air 42 carried from the inside of the vehicle to the air conditioner 7 is returned to the air conditioner 7 through the hollow profile constituting the end underframe 12 and the opening provided on the lower surface of the return air duct 14.
[0036]
　Further, the exhaust 43 transported from the inside of the vehicle to the outside of the vehicle is exhausted to the outside of the vehicle by a ventilation device adjacent to the air conditioner 7 through an opening (not shown) provided on the lower surface of the closing plate 19 and the exhaust duct 20.
[0037]
　The air supply 41 carried through the air supply duct 13 is the air supply duct 13 extending along the vertical (height) direction 101 between the side structure 3 and the interior panel 33 at the blowing portion shown in FIG. It is supplied into the car from the top of the window through the branch.
[0038]
　On the other hand, the return air 42 from the inside of the vehicle is supplied to the return air duct 14 through the intake portion passing through the gap 25 between the central floor plate 22 and the end floor plate 23 in the window portion shown in FIG. The intake portion of the return air 42 from the inside of the vehicle is provided with an opening penetrating in the vertical (height) direction 101 on the upper surfaces of the floor covering 24 and the return air duct 14. Here, a portion for taking in the return air 42 from the inside of the vehicle is provided in the window portion (FIG. 5), but as long as it is below the seat 31 so as not to deteriorate the appearance inside the vehicle, it is provided in the blowing portion (FIG. 4). It may be provided.
[0039]
　Further, the exhaust 43 from the inside of the vehicle is supplied to the exhaust duct 20 through the opening provided in the central floor plate 22 at the end portion in the longitudinal direction shown in FIG. In the intake portion of the exhaust 43 from the inside of the vehicle, an opening penetrating in the vertical (height) direction 101 is also provided on the upper surface of the floor covering 24, the hollow profile constituting the central underframe 11, and the exhaust duct 20. Here, the intake portion of the exhaust 43 from the inside of the vehicle is provided at the end portion in the longitudinal direction (FIG. 6) where a toilet or the like where odor is likely to be generated is arranged, but there is air to be exhausted outside the vehicle. It can also be installed in the place of.
[0040]
　According to the above configuration, the thickness of the underframe 4 represented by the vertical distance between the upper side plate 17 and the closing plate 19 of the hollow profile is thicker at the central underframe 11. It is possible to secure the rigidity and strength against the airtight pressure that exerts a large bending load on the underframe 11.
[0041]
　As a result, the thickness of the hollow profile constituting the underframe 4 can be reduced, so that the air supply duct 13 and the return air duct 14 are arranged on the upper part of the end underframe 12 to form the central underframe 11. Even if the exhaust duct 20 is arranged under the hollow profile, it is possible to avoid interference with the underfloor equipment while maintaining the position of the floor plate 63 in the height direction, and the hollow profile is thickened and compact. Can be avoided. Therefore, it is possible to construct the underframe of the railroad vehicle with a hollow profile while avoiding the increase in the manufacturing cost due to the increase in mass and the welding amount, so that the manufacturing of the railroad vehicle can be simplified and the manufacturing cost can be simplified. Can also be reduced.
[0042]
　Further, since the lower side plate 18 of the hollow profile material constituting the end underframe 12 is arranged on a substantially horizontal plane, it is possible to attach the underfloor equipment by using the receiver molded integrally with the hollow profile material. It will be possible. That is, there is no need to provide a separate receiver for the mounting portion of the underfloor equipment, which further simplifies the production. In addition, since the upper side plate 17 and the lower side plate 18 of the hollow profile constituting the underframe are smoothly connected from the central portion to the end portion, it is possible to avoid stress concentration due to a sudden change in the thickness of the hollow profile. can.
[0043]
　[Other Embodiments]
　Hereinafter, other embodiments of the rail vehicle according to the present invention will be described. Since the configuration other than the air passage through which the supply air and the return air pass is the same as that of the previous embodiment, the description thereof will be omitted.
[0044]
　FIG. 7 shows a sectional view taken along the line AA of the railway vehicle structure 1 shown in FIG.
　At the upper part of the end frame 12, an air supply space 51 for transporting air from the air conditioner 7 into the vehicle is located on the end side in the width direction 102, and a return air space 52 for transporting air from the vehicle interior to the air conditioner 7. Is on the center side in the width direction 102. In these spaces, the air supply duct and the return air duct shown in the previous embodiment do not exist. The air supply space 51 and the return air space 52 extend along the longitudinal direction 103 of the railway vehicle structure 1. The exhaust duct 20 may be omitted.
[0045]
　On the upper surface of the upper side plate 17 of the central underframe 11 and the end underframe 12 below the air supply space 51 and the return air space 52 (second upper side plate 17b and third upper side plate 17c in FIG. 2). Is coated with a heat insulating coating agent 53. The central floor plate 22, the end floor plate 23, and the floor plate support base 21 that supports them are made of a heat-insulating material. For example, it is preferable that the floorboard is made of wood and the floorboard support is made of rubber.
[0046]
　According to the above configuration, in addition to the effects shown in the previous embodiment, the air supply duct and the return air duct can be omitted, so that the mass can be further reduced and the manufacturing cost can be further reduced.
[0047]
　According to the present embodiment described above, after arranging the underframe at a position where interference with the underfloor equipment can be avoided, the upper part of the widthwise end of the underframe is used as an air supply space and a return air space. And can carry the return air. In addition, the thickness of the underframe in the central part in the width direction, where a large bending load acts against the airtight pressure, can be increased without increasing the thickness of the hollow profile, so that the increase in mass and the increase in manufacturing cost can be suppressed. Rigidity and strength against airtight pressure can be ensured. This makes it possible to construct the underframe of the high-speed vehicle with a hollow profile, simplify the production of the rail vehicle, and reduce the production cost.
[0048]
　The present invention is not limited to the above-described embodiment, and includes various modifications other than the above. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.
Code description
[0049]
1: Railroad vehicle structure 2: Roof structure 3: Side structure 4: Underframe,
5: Wife structure, 6: Window, 7: Air conditioner, 11: Central underframe,
12: End underframe, 13 : Air supply duct, 14: Return air duct,
15: Seat receiver, 16: Floor plate receiver, 17: Upper side plate,
18: Lower side plate, 19: Closing plate, 20: Exhaust duct,
21: Floor plate support , 22: Central floorboard, 23: Edge floorboard,
24: Floor covering, 25: Gap, 31: Seat, 32: Seat support,
33: Interior panel, 41: Supply air, 42: Return air, 43: Exhaust ,
51: Air supply space, 52: Return air space, 53: Insulation coating agent,
61: T-ribbed profile, 62: Cross beam, 63: Floor board,
101: Vertical (height) direction, 102: Width Direction, 103: Longitudinal direction
The scope of the claims
[Claim 1]
　It is a rail vehicle consisting of a roof structure that constitutes the upper surface, a side structure that constitutes the side surface, a wife structure that constitutes the end surface in the longitudinal direction, and an underframe that constitutes the lower surface, and the underframe
　is two pieces. The hollow profile is composed of a hollow profile composed of a face plate and ribs connecting the face plates, and the hollow profile
　constituting the underframe includes a first upper side plate arranged in the central portion in the width direction of the underframe. A first lower side plate arranged at the center of the underframe in the width direction, and a second upper side plate arranged at the width end of the underframe and located below the first upper side plate. , The second lower side plate arranged at the widthwise end of the underframe and located below the first lower side plate, and the first upper side plate and the second upper side plate are connected to each other. It has a third upper side plate and a third lower side plate connecting the first lower side plate and the second lower side plate, and a
　space is provided below the first lower side plate.
A rail vehicle provided, wherein a closing plate for connecting the adjacent ends of the pair of the second lower side plates is arranged .
[Claim 2]
　The rail vehicle according to claim 1,
　wherein the first upper side plate, the second upper side plate, and the third upper side plate are above the first upper side plate and the second upper side plate.
A rail vehicle characterized in that it is provided with a floor plate supported by a floor plate support base provided and / or a floor plate receiver provided inside the vehicle of the side structure so as to be supported along a substantially horizontal plane .
[Claim 3]
　The railroad vehicle according to claim 2,
　wherein the air conditioner arranged below the first lower side plate, the second lower side plate, and the third lower side plate, and
　the second upper side. It is composed of a space surrounded by a face plate, the third upper side plate, the floor plate, the floor plate support base, and the inner surface of the vehicle of the side structure, and is returned as an air supply space extending in the longitudinal direction of the underframe.
　An opening extending in the vertical direction provided in the hollow profile constituting the widthwise end portion of the underframe , which is provided with an air space, is located above the air conditioner, and the air conditioner is provided through the
　opening . The
railroad vehicle is characterized in that the supply air carried from the inside of the vehicle to the inside of the air supply space passes through the inside of the air supply space, and the return air carried from the inside of the vehicle to the air conditioner passes through the inside of the return air space. ..
[Claim 4]
　In the rail vehicle according to claim 3, the
　air supply space is arranged closer to the widthwise end of the underframe than the return air space, and the
　air supply space and the return air space. A gap is formed in the floor plate above the 　air supply space, the gap of the floor plate above the air supply space
　is provided near the inside of the vehicle of the side structure, and the gap of the floor plate above the return air space is provided. Is a rail vehicle characterized
by being installed below multiple seats arranged in the vehicle.
[Claim 5]
　The rail vehicle according to claim 3,
　wherein the heat insulating coating agent is applied to the upper surface of the second upper side plate and the third upper side plate
.
[Claim 6]
　The rail vehicle according to claim 5,
　wherein the floor plate and the floor plate support base are made of a material having heat insulating properties
.
[Claim 7]
　The rail vehicle according to claim 3, which
　is arranged inside a space surrounded by the first lower side plate, the third lower side plate, and the closing plate, and extends in the longitudinal direction of the underframe. A
rail vehicle characterized by being equipped with an exhaust duct .
[Claim 8]
　The rail vehicle according to claim 3,
　wherein the air supply duct is arranged inside the air supply space and extends in the longitudinal direction of the underframe, and is arranged inside the return air space. A return air duct extending in the longitudinal direction of the underframe is provided, and
　the supply air carried from the air conditioner into the vehicle passes through the inside of the air supply duct and is carried from the inside of the vehicle to the air conditioner.
A rail vehicle characterized in that the air conditioner passes through the inside of the return air duct .
[Claim 9]
　The rail vehicle according to claim 8,
　wherein the air supply duct is closer to the widthwise end of the underframe than the return air duct, and is
　above the air supply duct and the return air duct. There is a gap in the floor plate, the gap of the
　floor plate above the air supply duct is provided near the inside of the vehicle of the side structure, and the
　gap of the floor plate above the return air duct is in the vehicle.
A rail vehicle characterized by being installed below multiple seats .
[Claim 10]
　The rail vehicle according to claim 9, which
　is arranged inside a space surrounded by the first lower side plate, the third lower side plate, and the closing plate, and extends in the longitudinal direction of the underframe. A
rail vehicle characterized by being equipped with an exhaust duct .