JP7516269B2 - Rail vehicle and manufacturing method for rail vehicle - Google Patents

Description

The present invention relates to a rail vehicle and a method for manufacturing a rail vehicle.

In general, railway vehicles that operate along laid tracks require that the underframe that forms the floor of the vehicle has sufficient insulation performance to prevent atmospheric heat in summer, when the outside temperature is high, and heat generated by equipment placed under the floor from penetrating into the vehicle through the underframe, as well as fire resistance to protect against fires under the floor.

Traditionally, in railway vehicles, heat insulation is installed on the inside and outside of the underframe, and on the outside of the underframe, plate-shaped heat shielding material is placed under the floorboards to further enhance fire resistance.

Patent Document 1 proposes a floor structure for a linear motor vehicle that can provide the same fire resistance as conventional linear motor vehicles, without compressing the space under the floor for cables, piping, equipment, etc., in a linear motor vehicle with a small space under the floor. Patent Document 1 discloses a technology in which a plate-shaped expansion type insulation material is disposed under the floor in a floor structure for a linear motor vehicle in which the underside of the floor plate is supported by a beam structure that combines multiple beam members extending in the front-rear direction of the vehicle and multiple beam members extending in the vehicle width direction.

JP 2009-196531 A

Generally, railway vehicles that have heat insulation applied to the inside of the upper surface of the underframe and fire resistance on the outside of the underframe's lower surface tend to increase the labor required to manufacture the railway vehicles because heat insulation that suppresses heat transfer and heat shields to increase fire resistance under the floor are applied.

The present invention was made in consideration of the problems with the conventional technology, and aims to provide a rail vehicle having an underframe that ensures thermal insulation and fire resistance while reducing manufacturing man-hours, and a method for manufacturing the rail vehicle.

In order to solve the above problems, one representative rail vehicle of the present invention is as follows:
A rail vehicle having an underframe,
the underframe includes an interior side panel, an exterior side panel, and a connecting member connecting the interior side panel and the exterior side panel, and is formed of a hollow extruded shape extruded along a longitudinal direction of the railway vehicle;
the interior side panel has a plurality of first curtain rail structures including a vertical piece having a lower end connected to the interior side panel, a horizontal piece extending in one horizontal direction from an upper end of the vertical piece, and a segment extending in the other horizontal direction from the vertical piece,
the vehicle exterior side panel has a plurality of second curtain rail structures including a vertical piece having an upper end connected to the vehicle exterior side panel and a horizontal piece extending horizontally from a lower end of the vertical piece,
an upper floor formed on the vehicle interior side of the underframe includes a first insulating material placed on a surface of the vehicle interior side panel on the vehicle interior side, a floor panel installed on an upper surface of the first insulating material by using the first curtain rail structure, and a floor covering placed on an upper surface of the floor panel,
the heat shielding portion configured on the vehicle exterior side of the underframe is composed of a second heat insulating material placed on the vehicle exterior side panel, and a heat shielding plate installed on a lower surface of the second heat insulating material by using the second curtain rail structure,
the floor panel is supported by a vibration-damping rubber material provided on the vehicle interior side panel on the opposite side to the portion to which the connecting member is connected,
This is achieved by placing the ends of the floor plate in the width direction of the railway vehicle on the pieces .

According to the present invention, it is possible to provide a railway vehicle having an underframe that ensures heat insulation and fire resistance while reducing the number of manufacturing steps, and a method for manufacturing a railway vehicle.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.

FIG. 1 is a side view of a railroad vehicle. FIG. 2 is a cross-sectional view (cross-sectional view taken along line AA in FIG. 1) intersecting the longitudinal direction of the underframe that forms the floor surface of the railway vehicle. FIG. 3 is a cross-sectional view (enlarged view of part B in FIG. 2) of an underframe having heat insulating properties and fire resistance properties and an upper floor provided on the upper surface of the underframe on the inside of the vehicle. FIG. 4 is a flow chart showing the process of installing a fire-resistant and heat-sealed floor structure on a frame.

A rail vehicle is a general term for vehicles that run along an installed track, including railway cars, streetcars, new transit system vehicles, and monorail vehicles. Hereinafter, with reference to the drawings, an embodiment of the present invention will be described using a railway car as a representative example of a rail vehicle.

Below, an embodiment of the invention according to the present invention will be described with reference to the drawings. First, the directions are defined. The longitudinal direction of the railway vehicle along the track (rail) is the X direction, the width direction of the railway vehicle along the sleepers (the direction intersecting the track on a horizontal plane) is the Y direction, and the height direction of the railway vehicle intersecting the X and Y directions is the Z direction. Below, these directions may be simply referred to as the X direction, Y direction, and Z direction.

Figure 1 is a side view of a railway vehicle. The railway vehicle 1 is composed of a pair of bogies 5 that move along a track 7, and a vehicle structure 3 supported by the bogies 5. The vehicle structure 3 is a hexahedron consisting of an underframe 10 that forms the floor surface, a pair of side structures 20 erected along the X direction at both ends of the underframe 10 in the Y direction, a pair of end structures (not shown) erected along the Y direction at both ends of the underframe 10 in the X direction, and a roof structure 40 placed on the upper ends of the side structures 20 and the end structure.

The side structure 20 includes side sliding doors 24 for passengers to board and disembark, and windows 22. An air conditioning unit 6 that adjusts the temperature and humidity inside the passenger compartment is mounted on the top surface of the roof structure 40. Note that the air conditioning unit 6 may be mounted under the floor of the railway car 1, but is often fixed to the top surface of the roof structure 40.

Figure 2 is a cross-sectional view (A-A cross-sectional view in Figure 1) intersecting the longitudinal direction of the underframe that forms the floor surface of the railway vehicle. The underframe 10 consists of an interior side panel 11, an exterior side panel 12, and a number of connecting ribs (connecting members) 13 that connect these panels. In general, the underframe 10 is made of a hollow extruded material in which the panel 11, panel 12, and connecting ribs 13 are extruded integrally in the X direction.

The interior side panel 11 is integrally formed by extrusion molding with a plurality of curtain rail structures (also called first curtain rail structures) 14 to which the floor plate 52 constituting the upper floor 50 and the seat legs 70 are fixed. Similarly, the exterior side panel 12 is integrally formed by extrusion molding with a plurality of curtain rail structures (also called second curtain rail structures) 15 to which the underfloor equipment (not shown) and the heat shield plate 62 constituting the heat shield 60 described below are fixed. The curtain rail structure refers to a structure that includes a channel having a C-shaped cross section.

On the upper surface of the interior side panel 11 that constitutes the underframe 10, from the side of the interior side panel 11, there are provided, in this order, a heat insulating material (also called a first heat insulating material) 53 (including a rubber material 55), a floor panel 52 that restrains the heat insulating material, and a floor covering 51 provided on the upper surface of the floor panel 52. On the lower surface of the exterior side panel 12 that constitutes the underframe 10, there are provided, in this order, a heat insulating material (also called a second heat insulating material) 61 and a heat shield plate 62 that restrains the heat insulating material 61.

Figure 3 is a cross-sectional view of an underframe with thermal insulation and fire resistance and an upper floor provided on the upper surface of the underframe on the inside of the car (enlarged view of part B in Figure 2).

The track 7 on which the railcar 1 runs is equipped with railroad crossings where road vehicles and the like cross the track 7 at grade. For this reason, it is anticipated that the railcar 1 will collide with road vehicles and the like at railroad crossings, and in the unlikely event that a road vehicle collides with the railcar 1 at a railroad crossing and becomes engulfed beneath the frame 10 and bursts into flames, the frame 10 of the railcar 1 is required to have fire resistance.

In addition, insulation is also required to prevent exhaust heat from electrical components installed under the floor of the railway vehicle 1 from entering the interior of the railway vehicle 1 via the underframe 10.

Fire resistance is the ability to prevent the spread of flames to the underframe 10 in the event of a fire starting below the underframe 10. On the other hand, thermal insulation is the ability to prevent the heat of the high temperature outside air in summer and the exhaust heat from electrical components installed under the floor of the railway car 1 from entering the interior of the railway car 1. Hereinafter, fire resistance and thermal insulation may be referred to as fire resistance and thermal insulation.

The fireproof and insulating performance of the underframe 10 that forms the floor surface of the railway vehicle 1 is provided by a fireproof and insulating floor structure 18 that is composed of the underframe 10, an upper floor 50 that is laid on the upper surface of the underframe 10, and a heat shield 60 that is laid on the underside of the underframe 10.

As described above, the underframe 10 is composed of an extruded member having an interior side panel 11, an exterior side panel 12 spaced apart and generally parallel to the interior side panel 11, and a connecting rib 13 connecting the interior side panel 11 and the exterior side panel 12. A curtain rail structure 14 to which the seat legs 70 and floor panel 52 are fixed is extruded integrally with the interior side panel 11. Similarly, a curtain rail structure 15 to which a heat shield 62 is fixed is extruded integrally with the exterior side panel 12.

The curtain rail structure 14 has a pair of vertical pieces 14b extending in the X direction, a horizontal piece 14a extending horizontally from the Z direction end of the vertical pieces 14b in an opposing manner, and a segment 14c extending approximately horizontally from the center of the vertical pieces 14b in the Z direction in the opposite direction to the extension direction of the horizontal piece 14a. The interior side panel 11, the vertical pieces 14b, and the horizontal piece 14a form a channel structure with a C-shaped cross section.

The curtain rail structure 15 has an upper end connected to the exterior side panel 12, a pair of vertical pieces 15b extending in the X direction, and a horizontal piece 15a extending horizontally in an opposing manner from the lower end of the vertical piece 15b in the Z direction. The exterior side panel 12, the vertical piece 15b, and the horizontal piece 15a form a channel structure with a C-shaped cross section.

The upper floor 50 is composed of a heat insulating material 53 placed on the upper surface of the interior side panel 11, a floor plate 52 placed on the upper surface of the heat insulating material 53, and a floor covering 51 placed on the upper surface of the floor plate 52. The heat insulating material 53 is made of a synthetic resin foam material that is flame-retardant and insulating. The floor plate 52 is made of wooden plywood that is itself fire-resistant and insulating.

Insulating material 53 and rubber material 55 supporting the floor panel 52 are placed in the area defined by the curtain rail structure 14 of the interior side panel 11 (between adjacent curtain rail structures 14). The rubber material 55 is discretely placed along the X and Y directions on the interior surface of the interior side panel 11.

The floor plate 52 has a floating floor structure in which both ends in the Y direction are supported by segments 14c of the curtain rail structure 14, and the center part in the Y direction is elastically supported by rubber material 55.

The restraining plate 54 is provided so as to straddle the Y-direction end of the floor plate 52 placed on the segment 14c and the horizontal piece 14a of the curtain rail structure 14. Both ends of the floor plate 52 in the Y-direction, the restraining plate 54, and the segment 14c of the curtain rail structure 14 are mechanically fixed together by the mechanical fastening portion 82.

The restraining plates 54 are provided discretely along the X direction at positions corresponding to the seat legs 70. The restraining plates 54 have holes through which mechanical fastening parts (e.g., bolts) 82 that fasten the floor plate 52 to the segment 14c of the curtain rail structure 14 pass and hold their heads, and holes through which mechanical fastening parts (e.g., bolts) 80 that fasten the seat legs 70 to the horizontal piece 14a of the curtain rail structure 14 pass.

The interior surfaces of the floor panel 52 and the restraint plate 54 are covered (laid) with a floor covering 51. The area of the floor covering 51 where the seat legs 70 of the seat are fastened is cut out, so that the seat legs 70 directly contact the restraint plate 54.

With this configuration, since there is no need to divide the floor covering 51 in the Y direction to fasten the seat legs 70, the manufacturing man-hours for constructing the floor covering 51 can be reduced. The seat legs 70, which are attached to the upper surface of the restraining plate 54 placed on the upper surface of the horizontal piece 14a of the curtain rail structure 14, are fastened to the curtain rail structure 14 (horizontal piece 14a) by the mechanical fastening part 80 in a manner that fastens the restraining plate 54 together. Here, the fastening can be performed by threading the threaded part of the bolt that penetrates the support plate of the seat legs 70 and the hole in the restraining plate 54 through the opposing edges of the horizontal piece 14a and screwing it into the nut inserted into the C-shaped cross-section channel structure.

The structure of the upper floor 50 using the curtain rail structure 14 allows the thickness dimension of the upper floor 50 in the Z direction to be reduced, providing a wide interior space in the Z direction.

The heat shield 60 is composed of a heat insulating material 61 arranged on the underside of the outer side panel 12, and a heat shield plate 62 that holds the heat insulating material 61. The heat insulating material 61 is made of a synthetic resin foam material having flame retardancy and heat insulating properties. The heat shield plate 62 is made of a stainless steel plate that is non-flammable and has high strength so as to withstand the collision of ballast laid on the track, and has a hole through which the screw part of the mechanical fastening part 84, the head of which is inserted into the curtain rail structure 15 integrally molded with the underframe 10, passes. The heat shield plate 62 is fastened to the horizontal piece 15a of the curtain rail structure 15 after the mechanical fastening part 84 is inserted into the hole of the heat shield plate 62. Here, the screw part of the bolt, the head of which is held in the C-shaped cross-section channel structure, protruding downward through the opposing edges of the horizontal piece 15a is passed through the hole of the heat shield plate 62 and then screwed into the nut to fasten the heat shield plate 62. Furthermore, when the polygonal head of the bolt or nut hits the inner wall and rotates and is fixed inside the C-shaped cross-section channel structure, it can be fastened by tightening only one side, which makes it easy to work with.

Figure 4 is a flowchart showing the process of constructing a fireproof and insulated floor structure on an underframe. The "S" in the flowchart from S10 to S120 stands for step. The manufacturing method for a railway vehicle will be explained with reference to the flowchart in Figure 4.

In S10, the work of constructing the fire-resistant and insulated floor structure on the underframe begins.
In S20, the underframe 10 (railroad car body structure) is prepared. Basically, the fire-insulated floor structure is constructed on the underframe 10 of the railroad car body structure which is assembled into a hexahedron by the underframe 10, the side body structure 20, the end body structure, and the roof body structure 40.

<Assembly of the upper floor 50>
In S30, heat insulating material 53 and rubber material 55 are provided in the area (the interior surface of the interior side panel) defined by the curtain rail structure 14 on the upper surface (the interior surface) of the interior side panel 11 of the frame 10.

In S40, the floor plate 52 is prepared, and one widthwise end of the floor plate 52 is placed on the piece 14c facing it in a manner that covers the insulation material 53 and rubber material 55 placed in S30, and the other widthwise end of the floor plate 52 is placed on the piece 14c facing it.

At S50, a restraining plate 54 is provided on the widthwise end of the floor plate 52 and on the upper surface of the horizontal piece 14a of the curtain rail structure 14.

In S60, the mechanical fastening unit 82 fastens the widthwise ends of the restraining plate 54 and floor plate 52 to the segment 14c of the curtain rail structure 14. Here, a bolt with its head held by the restraining plate 54 is inserted through a hole in the floor plate 52 and then screwed into the screw hole in the segment 14c, so there is no need to use a nut.

In S70, the upper surface of the floor plate 52 (the surface facing the inside of the vehicle) is covered with the floor covering 51, and the seat legs 70 are placed on the upper surface of the restraint plate 54.

At S80, the mechanical fastening unit 80 fastens the seat leg 70 and the restraint plate 54 to the horizontal piece 14a of the curtain rail structure 14.

Through the above steps, the curtain rail structure 14, which is extruded integrally with the interior side panel 11 that constitutes the underframe 10, can be used to construct the upper floor 50, which is made up of insulation material 53, floor panel 52, floor covering 51, and a restraining plate 54 that fixes them to the underframe 10 and has thermal insulation properties. With this configuration, there is no need to prepare the curtain rail structure 14 separately from the underframe 10, so the upper floor 50 can be constructed while reducing manufacturing man-hours.

<Assembly of heat shield 60>
In S90, a heat insulating material 61 is provided in the area defined by the curtain rail structure 15 on the underside of the exterior side panel 12 of the underframe 10 (the exterior surface of the exterior side panel).

At S100, the head of the mechanical fastening part 84 is inserted into the curtain rail structure 15.

In S110, the threaded portion of the machine fastening portion 84 protrudes downward due to gravity, so this threaded portion is passed through the hole in the heat shield 62, and the heat shield 62 is fastened to the horizontal piece 15a in a manner that covers the insulating material 61, and is installed on the underside of the frame 10.

At S120, the process of installing the fireproof and insulated floor structure on the underframe is completed.

With the above-mentioned configuration for a railway vehicle, there is no need to prepare separate fasteners for fastening the floor plate 52 to the underframe 10, which reduces parts costs. In addition, if separate fasteners were used, the fasteners would need to be positioned on the upper surface of the interior side panel 11 before being fastened, but with this embodiment, the labor required for this can be eliminated.

Furthermore, only both ends of the floor plate 52 in the Y direction can be mechanically fixed to the segments 14c of the curtain rail structure 14, and the center of the floor plate 52 in the Y direction can be elastically supported discretely by rubber material 55. As a result, even if the vibration of the underfloor equipment (including electrical components) provided under the floor of the underframe 10 excites the underframe 10, the vibration of the underframe 10 is unlikely to be transmitted to the upper floor, so that an increase in interior noise due to mechanical excitation of the underfloor equipment can be suppressed.

Furthermore, since there is no need to prepare a separate fastener for fastening the heat shield plate 62 to the underframe 10, the cost of parts can be reduced. Also, if a separate fastener were used, it would be necessary to position the fastener on the upper surface of the exterior side panel 12 before fastening it, but with this embodiment, the labor required for this can be eliminated.

Furthermore, according to this embodiment, the underframe 10 is provided with an upper floor 50 with enhanced thermal insulation on the inside of the vehicle, and the underframe 10 is provided with a heat shielding section 60 with enhanced heat resistance on the outside of the vehicle. Therefore, even in the summer when the temperature outside the vehicle is high, the underframe 10 has high thermal insulation properties, so that the heat transmitted by the underframe 10 is prevented from entering the vehicle interior. This prevents the temperature inside the vehicle from rising and reduces the operating rate of the air conditioning unit 6, promoting energy conservation.

With the above configuration, this embodiment can provide a railway vehicle with an underframe that has enhanced insulation and fire resistance while reducing manufacturing man-hours.

1... railway vehicle, 3... vehicle body structure,
5... cart, 6... air conditioning unit,
7...track, 10...frame,
11... vehicle interior side panel, 12... vehicle exterior side panel,
13...connection rib (connection member), 14...curtain rail structure,
14a...Horizontal piece, 14b...Vertical piece,
14c...piece; 15...curtain rail structure;
15a...Horizontal piece, 15b...Vertical piece,
18... Fireproof and insulated floor structure, 20... Side structure,
22...window, 24...side sliding door,
40... roof structure, 50... upper floor,
51...floor covering, 52...floor board,
53...insulating material, 54...restraint plate,
55...rubber material, 60...heat shielding portion,
61...insulating material, 62...heat shielding plate,
70: Seat leg; 80, 82, 84: Mechanical fastening parts

Claims (4)

A rail vehicle having an underframe,
the underframe includes an interior side panel, an exterior side panel, and a connecting member connecting the interior side panel and the exterior side panel, and is formed of a hollow extruded shape extruded along a longitudinal direction of the railway vehicle;
the interior side panel has a plurality of first curtain rail structures including a vertical piece having a lower end connected to the interior side panel, a horizontal piece extending in one horizontal direction from an upper end of the vertical piece, and a segment extending in the other horizontal direction from the vertical piece,
the vehicle exterior side panel has a plurality of second curtain rail structures including a vertical piece having an upper end connected to the vehicle exterior side panel and a horizontal piece extending horizontally from a lower end of the vertical piece,
an upper floor formed on the vehicle interior side of the underframe includes a first insulating material placed on a surface of the vehicle interior side panel on the vehicle interior side, a floor panel installed on an upper surface of the first insulating material by using the first curtain rail structure, and a floor covering placed on an upper surface of the floor panel,
the heat shielding portion configured on the vehicle exterior side of the underframe is composed of a second heat insulating material placed on the vehicle exterior side panel, and a heat shielding plate installed on a lower surface of the second heat insulating material by using the second curtain rail structure,
the floor panel is supported by a vibration-damping rubber material provided on the vehicle interior side panel on the opposite side to the portion to which the connecting member is connected,
A railway vehicle , characterized in that an end portion of the floor plate in the width direction of the railway vehicle is placed on the piece . The railway vehicle according to claim 1 ,
the upper floor has a restraining plate placed on an upper surface of an end portion of the floor plate in the width direction,
A railway vehicle, characterized in that the restraint plate, the end portion in the width direction of the floor plate, and the segment are fixed by a mechanical fastening portion. 3. The method for manufacturing a railway vehicle according to claim 2 ,
The first heat insulating material and the rubber material are arranged on the vehicle interior side panel partitioned by the first curtain rail structure,
placing the floor plate above the first insulating material and the rubber material;
The restraining plate is disposed above the horizontal piece of the first curtain rail structure and the end of the floor plate in the width direction;
and fastening the restraint plate and the floor plate to the segment using a mechanical fastener. In the manufacturing method of a railway vehicle according to claim 3 ,
The second heat insulating material is disposed on the vehicle exterior side panel defined by the second curtain rail structure;
The heat shield is disposed below the second insulating material and the horizontal piece of the second curtain rail structure;
and fastening the heat shield to the horizontal piece of the second curtain rail structure using a mechanical fastener.

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