Railway vehicle

Abstract

To provide a railway vehicle that ensures good welding quality by improving workability of welding at joints between side structures and roof structures.SOLUTION: In a railway vehicle 1 having a frame 21, a pair of side structures 23A, 23B joined to both ends of the frame 21 in a sleeper direction, and a roof structure 24 joined to upper ends of the pair of side structures 23A, 23B, the roof structure 24 comprises: a horizontal portion 421 of a rafter 41 and a roof outer panel 42 spanning the pair of side structures 23A, 23B; and a protruding portion 422 extending outward in the sleeper direction beyond the horizontal portion 421 of the rafter 41 and the roof outer panel 42 and joined to the side structures 23A, 23B. A welded portion 61 between the upper ends of the side structures 23A, 23B and the protruding portion 422 of the roof structure 24 is arranged above the horizontal portion 421 of the rafter 41 and the roof outer panel 42 of the roof structure 24.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a railway vehicle having an underframe, a pair of side structures joined to both ends of the underframe in the sleeper direction, and a roof structure joined to the upper ends of the pair of side structures. [Background technology]

[0002] Patent Document 1 discloses a railway vehicle in which the tip of a protruding portion of a roof structure is joined by welding to a flange portion of a side outer plate of a side structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-10655 Summary of the Invention [Problem to be solved by the invention]

[0004] In the railway vehicle disclosed in Patent Document 1, the joint between the side structure and the roof structure (i.e., the joint between the flange portion of the side outer plate of the side structure and the protruding portion of the roof structure) is located at the lower end of the downward-facing surface that descends from the second curved portion of the side outer plate of the side structure toward the roof structure, and at a position about the same height as the rafter portion of the roof structure.

[0005] In this way, the joints between the side structures and the roof structure are located between the descending surfaces of the side outer plates of the side structures and the rafters of the roof structure. Therefore, when welding the joints between the side structures and the roof structure during manufacturing or maintenance of a railway vehicle, it is necessary to pay close attention to the descending surfaces of the side outer plates of the side structures and the rafters of the roof structure, which may reduce workability. Therefore, the reduced workability in welding may result in insufficient weld quality at the joints between the side structures and the roof structure.

[0006] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a railway vehicle that can improve welding workability at the joints between the side structures and the roof structure and ensure good welding quality. [Means for solving the problem]

[0007] In order to achieve the above object, the railway vehicle of the present disclosure has the following configuration. (1) A railway vehicle having an underframe, a pair of side structures joined to both ends of the underframe in the sleeper direction, and a roof structure joined to the upper ends of the pair of side structures, characterized in that the roof structure has a first portion that traverses the pair of side structures and a second portion that protrudes outward in the sleeper direction from the first portion and joins to the upper ends of the side structures, and the joint between the upper ends of the side structures and the second portion of the roof structure is located at a position above the first portion of the roof structure.

[0008] In the present disclosure, when welding the joint between the side structure and the roof structure, the need to pay attention to the side structure or the roof structure (first portion) is reduced, improving welding workability. As a result, it is possible to prevent welding defects from occurring at the joint between the side structure and the roof structure, and to ensure good welding quality. As a result, it is possible to improve the watertightness of the joint between the side structure and the roof structure. Therefore, even if a change in air pressure occurs inside the vehicle when passing through a tunnel, it is possible to prevent rainwater and the like from entering the vehicle through the joint between the side structure and the roof structure.

[0009] (2) In the railway vehicle of (1), it is preferable that the side structure has a curved portion that extends outward from the joint in the direction of the sleepers and curves toward the outside of the railway vehicle, and that the curved portion has a first curved portion and a second curved portion formed in that order from the joint side, and that the bending radius of the first curved portion is smaller than the bending radius of the second curved portion.

[0010] In the present disclosure, two stages of bending radius are set at the curved portion of the side structure by a first curved portion and a second curved portion. The bending radius of the first curved portion is smaller than the bending radius of the second curved portion. Therefore, the rigidity of the first curved portion is higher than the rigidity of the second curved portion. Therefore, the first curved portion can prevent welding distortion that occurs in the curved portion of the side structure when welding the joint between the side structure and the roof structure. Therefore, after welding the joint between the side structure and the roof structure, it is possible to suppress the occurrence of undulation in the curved portion of the side structure, thereby improving the aesthetic appearance of the side structure.

[0011] (3) In the railway vehicle of (1) or (2), it is preferable that the roof structure has a third portion between the first portion and the second portion, the second portion is positioned above the first portion via the third portion, and the joint is positioned above the gutter portion formed by the first portion and the third portion.

[0012] In the present disclosure, the joints between the side structures and the roof structure are located above the rain gutters, making it difficult for rainwater in the rain gutters to reach the joints between the side structures and the roof structure, thereby preventing rainwater in the rain gutters from entering the interior of the railway vehicle through the joints between the side structures and the roof structure. [Effects of the Invention]

[0013] According to the railway vehicle of the present disclosure, welding workability can be improved at the joints between the side structures and the roof structure, and good welding quality can be ensured. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side view of a railway vehicle according to an embodiment of the present invention. [Figure 2] 2 is a diagram schematically showing a cross section (AA cross section) of the vehicle body structure of the railway vehicle of FIG. 1 as viewed from the track direction. FIG. [Figure 3] 2 is a view showing a welded portion and its periphery at one end of both ends of the railway vehicle in the sleeper direction, taken along the cross section BB of FIG. 1. FIG. [Figure 4] FIG. 4 is a partially enlarged view of a portion X in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of a railway vehicle according to the present disclosure will be described.

[0016] [Railway vehicle configuration] First, the configuration of a railway vehicle 1 according to this embodiment will be described.

[0017] As shown in FIG. 1, the railway vehicle 1 is a vehicle that runs on a track 101 and includes a vehicle body structure 11 and a bogie 12.

[0018] As shown in Figures 1 and 2, the vehicle body structure 11 is configured to form a hexahedron by an underframe 21, a pair of gable bodies 22, a pair of side bodies 23A and 23B, and a roof body structure 24.

[0019] The underframe 21 forms the floor of the railway vehicle 1. A pair of gable body structures 22 are erected at both ends of the underframe 21 in the track direction, thereby forming coupling sections of the railway vehicle 1. A pair of side body structures 23A, 23B are erected and joined to both ends of the underframe 21 in the sleeper direction, thereby forming side surfaces 11a of the vehicle body structure 11. The roof body structure 24 is joined to the upper ends of the gable body structure 22 and the side body structures 23A, 23B, thereby forming the roof surface 11b of the vehicle body structure 11.

[0020] 2, the vehicle body structure 11 is gently curved from the upper end of the side surface 11a toward the roof surface 11b. Furthermore, as shown in FIG. 1, the vehicle body structure 11 is provided with a passenger entrance / exit door 31 and a window 32 that lead to the interior passenger compartment.

[0021] The bogie 12 supports the vehicle body structure 11 via air springs 13 .

[0022] 1, the railway vehicle 1 of this embodiment is an intermediate vehicle with coupling portions formed at both ends in the track direction, but is not limited to this and may be a lead vehicle. When the railway vehicle 1 is a lead vehicle, a leading end bodyshell that forms the front end of the railway vehicle 1 is erected at one of the both ends in the track direction of the underframe 21, and a gable bodyshell 22 that forms the coupling portion of the railway vehicle 1 is erected at the other end.

[0023] [Side and roof structure] Next, the structures of the side structures 23A, 23B and the roof structure 24 will be described. Note that Figures 3 and 4 illustrate one end (the end on the side structure 23A side) of both ends of the railway vehicle 1 in the sleeper direction, but the other end (the end on the side structure 23B side) has a similar configuration. Therefore, in the following explanation, the side structure 23A side will be described as a representative example.

[0024] As shown in FIGS. 3 and 4, the roof structure 24 includes rafters 41, roof outer panels 42, and beams 43.

[0025] Rafters 41 are made of metal such as carbon steel, stainless steel, or aluminum alloy, and are formed in an arch shape with the center in the sleeper direction bulging upward, and extend along the sleeper direction of railway vehicle 1 to bridge a pair of side structures 23A, 23B (i.e., as shown in FIG. 2, they bridge horizontally). A plurality of these rafters 41 are provided at predetermined intervals (for example, 0.4 m intervals) in the track direction of railway vehicle 1.

[0026] The roof outer plate 42 is made of stainless steel or the like, and is formed long along the track direction of the railway vehicle 1 using plate material with a thickness of about 0.6 to 2.5 mm, and forms the roof surface 11b, which is the outer surface of the vehicle body structure 11. The roof outer plate 42 has a cross section 421, a protruding section 422, and an erected section 423.

[0027] The cross section of the cross section 421 cut in the sleeper direction is formed in an arch shape that follows the shape of the rafters 41, and is supported by the rafters 41 from the inside of the railway vehicle 1. In this way, like the rafters 41, the cross section 421 is formed in an arch shape with the central portion in the sleeper direction bulging upward, and extends along the sleeper direction of the railway vehicle 1 to cross the pair of side structures 23A, 23B. The rafters 41 and the cross section 421 of the roof outer panel 42 are an example of a "first portion" in the present disclosure.

[0028] The protruding portion 422 protrudes substantially horizontally from the end in the sleeper direction outward in the sleeper direction beyond the cross section 421 supported by the rafters 41. As will be described later, this protruding portion 422 is joined to a flange portion 523 of the side outer plate 52 of the side structure 23A at a welded portion 61. The protruding portion 422 is formed over the entire length of the roof outer plate 42 in the track direction. The protruding portion 422 is an example of a "second portion" in the present disclosure.

[0029] The erected portion 423 is provided between the outer end of the cross section 421 in the sleeper direction and the inner end of the protruding portion 422 in the sleeper direction, so as to rise upward from the cross section 421 (i.e., toward the protruding portion 422). The erected portion 423 is an example of the "third portion" of the present disclosure.

[0030] The girder 43 is a long member made of stainless steel or the like and formed along the track direction of the railway vehicle 1. The girder 43 has a first connection piece 431 joined to the rafter 41 and a second connection piece 432 joined to the roof outer panel 42. The first connection piece 431 and the second connection piece 432 are formed to have a step, so that the cross section of the girder 43 cut in the sleeper direction is approximately Z-shaped.

[0031] The first connection piece 431 is joined, for example, by spot welding, to the surface of the rafter 41 facing the inside of the railway vehicle 1 (i.e., the inner surface 411). The second connection piece 432 is joined, for example, by spot welding, to the surface of the protruding portion 422 of the roof outer panel 42 facing the inside of the railway vehicle 1. In this way, the girder 43 reinforces the protruding portion 422 of the roof outer panel 42.

[0032] The side structure 23A includes vertical ribs 51, side outer plates 52, and cross ribs 53. The vertical ribs 51 are erected at the ends of the underframe 21 (see FIG. 1) in the sleeper direction and extend in the up-down direction of the railway vehicle 1. A plurality of vertical ribs 51 are provided at predetermined intervals (for example, 1 meter intervals) in the track direction. In this way, the vertical ribs 51 support the side outer plates 52 from the inside of the railway vehicle 1.

[0033] The vertical frame 51 includes a first frame member 511 and a second frame member 512. The first frame member 511 is formed from a metal plate such as carbon steel, stainless steel, or aluminum alloy, with a hat-shaped cross section. The first frame member 511 has its lower end (i.e., the lower lower end (not shown) in FIG. 3) joined to the underframe 21 (see FIG. 1), and is set upright approximately perpendicular to the underframe 21 along the side surface 11a to support the side surface 11a formed by the side outer plate 52 from the inside of the railway vehicle 1.

[0034] The second bone member 512 is a metal plate material such as carbon steel, stainless steel, or aluminum alloy formed into a groove shape (with a U-shaped cross section). The second bone member 512 is disposed at an angle to the first bone member 511.

[0035] A support portion 513 parallel to a flange portion 523 of the side outer plate 52, which will be described later, is provided at the end of the second rib member 512. The support portion 513 is joined to the flange portion 523 by, for example, spot welding.

[0036] Furthermore, a girder support 514 is provided at the end of the second frame member 512. The girder support 514 supports the end of the rafter 41 in the sleeper direction from below via the girder 43. Furthermore, the girder support 514 is joined to the girder 43 by welding. Note that the position of the rafter 41 in the track direction of the railway vehicle 1 may or may not coincide with the position of the vertical frame 51 in the track direction of the railway vehicle 1. Even if they do not coincide, since the girder 43 is formed long in the track direction, the girder support 514 can support the rafter 41 via the girder 43 by being joined to the girder 43.

[0037] The side outer plates 52 are made of stainless steel or the like and have a thickness of 1.0 to 2.5 mm, and form the side surfaces 11a of the car body structure 11, which are the outer surfaces of the car body structure 11.

[0038] The side outer plates 52 are formed with vertical portions 521 that are substantially parallel to the first frame members 511 of the vertical frames 51 and form the side surfaces 11a of the vehicle body structure 11. The vertical portions 521 are supported from the inside of the railway vehicle 1 by the vertical frames 51 (the first frame members 511 of the vertical frames 51) via the cross frames 53.

[0039] Furthermore, side outer plate 52 has curved portion 522 (i.e., a portion formed in a convex shape toward the outside of the vehicle) that extends outward in the direction of the sleepers (toward the outside of railway vehicle 1) from welded portion 61 and gradually curves downward. This curved portion 522 is connected to the upper end of vertical portion 521.

[0040] Furthermore, the side outer plate 52 is formed with a flange portion 523 that is parallel to the protruding portion 422 of the roof outer plate 42 of the roof structure 24. This flange portion 523 supports the protruding portion 422 from below. Then, at a welded portion 61, the flange portion 523 and the tip of the protruding portion 422 are joined by welding (for example, arc welding, TIG welding, MIG welding, etc.). This welding is a continuous welding performed along the track direction of the railway vehicle 1, and the protruding portion 422 is joined to the flange portion 523 over its entire length in the track direction. The flange portion 523 is an example of the "upper end portion of the side structure" in the present disclosure. The welded portion 61 is also an example of the "joint" in the present disclosure.

[0041] Furthermore, roof outer panel 42 is provided with gutter section 62, which is formed by the step between horizontal section 421 and protruding section 422, i.e., formed by horizontal section 421 and standing section 423, and is capable of catching rain that falls on roof structure 24. As described above, protruding section 422 is joined to flange section 523 by continuous welding over the entire length of protruding section 422 in the track direction, and further, weld section 61 is formed at a position different from gutter section 62, so that watertightness between protruding section 422 and flange section 523 is ensured.

[0042] The cross ribs 53 are made of a metal plate material such as carbon steel, stainless steel, or aluminum alloy, have a hat-shaped cross section, and are formed long along the track direction of the railway vehicle 1. The cross ribs 53 are joined to the inner surfaces of the side outer plates 52 of the railway vehicle 1, and the side outer plates 52 are joined to and supported by the vertical ribs 51 via the cross ribs 53. Specifically, the vertical portions 521 of the side outer plates 52 are joined to and supported by the first rib members 511 of the vertical ribs 51 via the cross ribs 53.

[0043] [Regarding the welded joints between the side structure and roof structure and the surrounding structure] In this embodiment, as shown in Fig. 2, welded portion 61 between side structures 23A, 23B and roof structure 24 is located at the uppermost position in vehicle bodywork 11. Specifically, as shown in Figs. 3 and 4, welded portion 61 is located at the upper end of side structure 23A and at a position above rafters 41 of roof structure 24 and cross section 421 of roof outer panel 42 of railway vehicle 1.

[0044] By positioning the welded portion 61 at the topmost position of the vehicle body structure 11 in this way, the need to pay attention to the side outer panels 52 of the side body structure 23A and the horizontal portions 421 of the roof outer panel 42 of the roof body structure 24 when welding the welded portion 61 is reduced, improving welding workability. This makes it possible to prevent welding defects from occurring at the welded portion 61 and ensure good welding quality. This also makes it possible to improve the watertightness of the welded portion 61. Therefore, even if a change in air pressure occurs inside the vehicle when passing through a tunnel, for example, it is possible to prevent rainwater and the like from entering the vehicle through the welded portion 61.

[0045] Furthermore, because welded portion 61 can be formed by continuous welding, the watertightness of welded portion 61 can be improved, making it more difficult for rainwater and the like to seep into the vehicle interior through welded portion 61. This eliminates the need to apply a watertight sealant to welded portion 61, reducing the number of parts and eliminating the need to maintain the watertight sealant.

[0046] Furthermore, since welded portion 61 is located at the upper end of side structure 23A and at a position higher on the railway car 1 than rafters 41 of roof structure 24 and cross portion 421 of roof outer plate 42, it is possible to make the step portion between side structure 23A and roof structure 24 (i.e., upright portion 423 of roof outer plate 42) invisible from side surface 11a of car body structure 11. This improves the aesthetic appearance of railway car 1.

[0047] Furthermore, by positioning the welded portion 61 within the application range of the roof insulation material (i.e., the insulation material on the roof surface 11b), the watertightness of the welded portion 61 can be improved, thereby preventing rainwater and the like from entering the interior of the vehicle through the welded portion 61.

[0048] 3 and 4, in the curved portion 522 of the side outer plate 52 of the side structure 23A, a first curved portion 522A and a second curved portion 522B are formed in this order from the side of the welded portion 61. The bending radius of the first curved portion 522A (for example, 50 mm) is smaller than the bending radius of the second curved portion 522B (for example, 200 mm).

[0049] In this way, two stages of bending radius are set by the first bending portion 522A and the second bending portion 522B at the bending portion 522 connected to the welded portion 61. The bending radius of the first bending portion 522A is smaller than the bending radius of the second bending portion 522B. Therefore, the rigidity of the first bending portion 522A is higher than the rigidity of the second bending portion 522B.

[0050] Therefore, welding distortion (i.e., swell occurring in curved portion 522) occurring when welding weld portion 61 can be stopped by first curved portion 522A and prevented from reaching second curved portion 522B. Therefore, since swell occurring in curved portion 522 can be suppressed after welding weld portion 61, the aesthetic appearance of side surface 11a of vehicle body structure 11 (i.e., side outer plate 52 of side body structure 23A) can be improved.

[0051] Furthermore, since the side outer plates 52 of the side structure 23A are made up of vertical portions 521 and curved portions 522 connected to the upper ends of the vertical portions 521, the curved portions 522 can be formed simply by bending the side outer plates 52 in a single direction. Therefore, the shape of the side structure 23A is simple and easy to process.

[0052] Furthermore, roof outer plate 42 of roof structure 24 is provided with standing portions 423 between horizontal portions 421 and protruding portions 422. Protruding portions 422 are arranged at a position above horizontal portions 421 on railway vehicle 1 via standing portions 423. Furthermore, horizontal portions 421 and standing portions 423 of roof outer plate 42 form gutter portions 62. Welded portions 61 are arranged at a position above gutter portions 62.

[0053] In this way, since the welded portion 61 is disposed at a position higher than the rain gutter portion 62, it becomes difficult for rainwater in the rain gutter portion 62 to reach the welded portion 61. Therefore, it is possible to prevent the rainwater in the rain gutter portion 62 from entering the interior of the railway vehicle 1 through the welded portion 61.

[0054] It should be noted that the above-described embodiments are merely examples and do not limit the present disclosure in any way. It goes without saying that various improvements and modifications are possible within the scope of the gist of the present disclosure. [Explanation of symbols]

[0055] 1. Railway vehicles 11 Vehicle body structure 21 Frame 23A, 23B side structure 24 Roof structure 41 Rafters 42 Roof outer panel 421 Horizontal section 422 Protrusion 423 Standing section 43 Girder material 51 Vertical bone 52 Side shell 522 curved section 522A First curved section 522B Second curved section 523 Flange 53 Lateral bone 61 Welded section 62 Gutter section

Claims

1. A railway vehicle having an underframe, a pair of side structures joined to both end portions of the underframe in a sleeper direction, and a roof structure joined to upper ends of the pair of side structures, The roof structure includes: a first portion that spans the pair of side structures; a second portion that protrudes outward in the sleeper direction from the first portion and is joined to an upper end of the side structure; Equipped with a joint between an upper end of the side structure and the second portion of the roof structure is located at a position higher than the first portion of the roof structure; A railway vehicle characterized by:

2. The railway vehicle of claim 1, the side structure includes a curved portion that extends outward from the joint in the direction of the sleepers and curves toward the outside of the railway vehicle, The curved portion includes a first curved portion and a second curved portion formed in this order from the joint portion side, The bending radius of the first curved portion is smaller than the bending radius of the second curved portion. A railway vehicle characterized by:

3. The railway vehicle according to claim 1 or 2, the roof structure includes a third portion between the first portion and the second portion, the second portion is disposed at a position above the first portion via the third portion, The joint portion is disposed at a position above a gutter portion formed by the first portion and the third portion; A railway vehicle characterized by:

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