Railway vehicle

Abstract

To provide a railway vehicle that has a lightweight, high-strength, and highly manufacturable body structure and yet can suppress vibrations and noise propagating inside the vehicle.SOLUTION: A railway vehicle including a roof structure including an extruded member made up of outer and inner plates facing each other at a distance and a connecting rib connecting the two plates, has a reinforcing section thicker than the extruded member arranged in a portion of the roof structure in the vehicle width direction. This allows for a lightweight, high-strength, and easy-to-manufacture vehicle body structure while suppressing vibrations and noise propagating inside the vehicle.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rail vehicle. [Background technology]

[0002] Rail vehicles, especially recent trains, often use a structure known as a double-skin body structure, which is lightweight, strong, and easy to manufacture. This double-skin body structure is made up of hollow extruded aluminum material, and has a truss-shaped cross-sectional structure consisting of a pair of outer and inner panels that face each other at a distance, and connecting ribs that connect them. The double-skin body structure is lightweight and has high bending rigidity, and is also easy to manufacture because it uses extruded material with the same cross-sectional structure in the longitudinal direction of the vehicle.

[0003] Techniques for increasing the rigidity and strength of a car body have been studied for some time. For example, Patent Document 1 discloses a structure in which continuous beads are arranged in parallel along the car body width direction at arbitrary intervals along the car body longitudinal direction on the roof outer panel of the car body, with the aim of providing a vehicle roof structure that has strength characteristics that can withstand pressure fluctuations acting on the car body, prevents distortion, and is easy to manufacture. The beads have a cross-sectional shape in the car body longitudinal direction that protrudes outward, and are formed integrally with the roof outer panel by beading processing on a flat plate material.

[0004] Furthermore, Patent Document 2 discloses a structure that aims to suppress elastic vibration of the car body and provide a rail vehicle with a comfortable ride, by making the height of the aluminum extruded profiles that make up the underframe higher than the height of the profiles that make up a single member, thereby strengthening bending rigidity, thereby improving car body rigidity and reducing car body vibration. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-247296 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-55483 Summary of the Invention [Problem to be solved by the invention]

[0006] Although double-skin structures are lightweight and highly rigid, they have the drawback of being prone to radiating sound when an excitation force is applied to the structure for any reason, as the entire structure vibrates. This raises concerns that the generated sound could propagate inside the vehicle and increase interior noise. Sources of such excitation force include air conditioning units and current collectors mounted on the roof. Furthermore, once the structure vibrates, the vibrations propagate to the interior materials through the fastening parts, and sound is then radiated from the interior materials, raising concerns that this could also increase interior noise.

[0007] An object of the present invention is to provide a railway vehicle that has a lightweight, high-strength, and easy-to-manufacture car body structure, yet is capable of suppressing vibrations and noise propagating inside the vehicle. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, one representative railway vehicle of the present invention is a railway vehicle equipped with a roof structure including an extruded member configured from an outer plate and an inner plate opposed to each other with a gap therebetween, and a connecting rib connecting the two plates, This is achieved by disposing a reinforcing portion having a thickness greater than that of the extruded member in a portion of the roof structure in the vehicle width direction. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a railway vehicle that has a lightweight, high-strength, and highly manufacturable car body structure, while being able to suppress vibrations and noise propagating inside the car. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic cross-sectional view of a railway vehicle according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing the propagation paths of vibration and noise into the vehicle interior. [Figure 3] FIG. 3 is a schematic cross-sectional view showing a roof structure according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic cross-sectional view showing another form of the roof structure in the first embodiment of the present invention. [Figure 5] FIG. 5 is a schematic cross-sectional view showing a roof structure according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram showing a method for manufacturing the roof structure shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Rail vehicles are vehicles that operate along laid tracks, and include railway cars, monorail cars, streetcars, new transit vehicles, etc. As a representative example of a rail vehicle, an embodiment of the present invention will be described using a railway car. In this specification, unless otherwise specified, "width direction" refers to the width direction of the railway car. Furthermore, "the length of one truss" refers to the distance between the joint between the connecting rib and one of the plates in a truss structure consisting of an outer plate, an inner plate, and a pair of connecting ribs connecting the two plates.

[0012] FIG. 1 is a schematic cross-sectional view of a railway vehicle 1 according to an embodiment of the present invention. The carbody of the railway vehicle 1 is composed of a roof structure 2, a side structure 3, a floor structure 4, and an end structure (not shown), with roof-mounted equipment such as an air conditioning unit 5 mounted on the roof structure 2. The interior of the railway vehicle 1 is equipped with ceiling interior materials 6, side ceiling interior materials 7, lighting fixtures 8, side interior materials 9, an interior floor 10, seats 11, luggage racks 12, and the like. The roof structure 2, the side structure 3, and the floor structure 4 are primarily formed from hollow extruded material known as a double-skin structure, which is lightweight, has high bending rigidity, and is easy to manufacture because the extruded material has the same cross-sectional structure along the length of the vehicle.

[0013] The double-skin structure is lightweight and highly rigid, but on the other hand, there was concern that once roof-mounted equipment such as an air conditioning unit vibrates, the entire roof structure vibrates and radiates sound, or the vibrations are transmitted to the ceiling interior material via the fastening parts, and sound is then radiated from the ceiling interior material, easily propagating noise inside the vehicle. This mechanism is explained in detail using Figure 2.

[0014] 2 is a schematic diagram showing the vibration propagation path of an air conditioner mounted on a roof. Air conditioner fan 13 and other components are mounted inside air conditioner housing 5a, and rotational vibrations of air conditioner fan 13 cause vibrations in air conditioner housing 5a. Furthermore, pressure fluctuations, i.e., aerodynamic excitation forces, are generated when the air flowing along the roof is disturbed by steps in air conditioner housing 5a, and these aerodynamic excitation forces also vibrate air conditioner housing 5a. Vibrations in air conditioner housing 5a are then propagated to roof structure 2 via fastening parts 14, potentially causing the entire roof structure 2 to vibrate.

[0015] In this way, once vibrations are transmitted to the roof structure 2, because the double skin structure is lightweight and highly rigid, there is the problem that the entire roof structure vibrates and tends to radiate sound, as shown in mode (a) in Figure 2. In addition, because the roof structure 2 is connected to the ceiling interior material 6 and the side ceiling interior material 7 via fastening parts 15, there is also the problem that vibrations are transmitted to these interior materials 6 and 7 and tend to radiate sound, as shown in mode (b) in Figure 2.

[0016] (Embodiment 1) A first embodiment of the present invention that can solve this problem will be described with reference to Figure 3. In this embodiment, a locally thick portion (also called a reinforced portion) 21 is provided in a part of the roof structure 2, and fastening portions 22 for fastening roof-mounted equipment such as an air conditioning unit 5 are provided at this portion. The width of the locally thick portion 21 is preferably set to the width of about one or two trusses of the roof structure 2. This allows the locally thick portion 21 to be positioned while avoiding interference with the roof-mounted equipment.

[0017] According to this structure, the locally thick portions 21 of the double skin bodywork have high bending rigidity, and therefore are likely to become nodes in the vibration modes of the roof bodywork 2, making it difficult for the power of excitation forces to be input. Therefore, even if vibrations from roof-mounted equipment such as the air conditioning unit 5 are transmitted, the vibrations are blocked by the locally thick portions 21 of the double skin bodywork, and there is an advantage in that the vibrations are unlikely to propagate to the general parts of the roof bodywork 2 (i.e., other than the locally thick portions 21). Furthermore, since the locally thick portions 21 also tend to become nodes in the vibration modes of the roof bodywork 2, their own vibrations are also reduced. As a result, the vibration of the entire roof bodywork 2 is suppressed. This suppresses vibration modes that cause the entire roof bodywork 2 to vibrate, and reduces sound radiation from the roof bodywork 2, thereby reducing noise transmitted into the vehicle interior.

[0018] Furthermore, as shown in Figure 3, by connecting fastening parts 23 between the ceiling interior material 6 and the side ceiling interior material 7 to the locally thick portion 21 of the roof structure 2, it is possible to make it difficult for vibrations to be transmitted to the ceiling interior material 6 and the side ceiling interior material 7. The reason for this is that, as mentioned above, the locally thick portion 21 is likely to become a node in the vibration mode of the roof structure 2, and vibrations are small. This reduces vibration-propagated noise caused by vibrations of the ceiling interior material 6 and the side ceiling interior material 7, and ultimately reduces interior noise.

[0019] 3, an example structure has been described in which the locally thickened portion 21 of the double-skin structure has a cylindrical peripheral wall with a roughly octagonal cross section, and the outer ends of six ribs extending radially from the center of the peripheral wall are connected to the inner periphery of the peripheral wall to increase its strength. Extruded material is joined to both sides of the peripheral wall in the width direction. The cylindrical shape of portion 21 may be any polygon other than octagonal, and is not limited to polygons, and there are no restrictions on the presence or number of ribs.

[0020] For example, as shown in Figure 4, the double skin structure may have a hollow cylindrical peripheral wall, such as the locally thickened portion 21a. The locally thickened portions 21 and 21a of the double skin structure shown in Figures 3 and 4 can be formed by extrusion molding together with the rest of the double skin structure.

[0021] (Embodiment 2) 3 and 4, the explanation was given on the assumption that locally thick portions 21, 21a of the double skin structure are extruded integrally with a portion of the roof structure 2 adjacent in the width direction. However, it is conceivable that it may be difficult to extrude a locally thick portion integrally with the adjacent roof structure. In such cases, it is also possible to extrude the locally thick portions 21, 21a of the double skin structure as separate members, or to form them separately by welding multiple plates together, and then later integrate them with the adjacent roof structure 2 by welding or mechanical fastening.

[0022] As an example of such a case, a second embodiment of the present invention will be described with reference to Figures 5 and 6. In this embodiment, as shown in Figure 5, a locally thick portion 21 of the double skin structure is divided into a portion 21b (also referred to as a first reinforcement portion) provided on the exterior side of the roof structure 2, and a portion 21c (also referred to as a second reinforcement portion) provided on the interior side of the roof structure 2.

[0023] Section 21b provided on the vehicle exterior side uses part of the outer plate of roof structure 2 as an inner plate, and has a small truss structure with a trapezoidal cross section in which the inner plate as a component is connected by a pair of connecting ribs to an outer plate that is approximately parallel to the outer plate of roof structure 2. Section 21c provided on the vehicle interior side uses part of the inner plate of roof structure 2 as an outer plate, and has a small truss structure with a trapezoidal cross section in which the outer plate as a component is connected by a pair of connecting ribs to an inner plate that is approximately parallel to the inner plate of roof structure 2.

[0024] As shown in Figure 6, after roof structure 2 is extruded, it is also possible to manufacture them as an integrated part by welding sections 21b and 21c, which are separate parts, to roof structure 2. As shown in Figure 6, by preferably welding at the apex of the truss of the extruded material (the connection between the outer plate or inner plate and the connecting rib), the weld strength can be further increased and the roof structure 2 and sections 21b and 21c, which are the welded members, can be more firmly integrated, but the welding points are not limited to these.

[0025] In this embodiment, as shown in Fig. 5, the thicker portion 21b on the vehicle exterior side and the thicker portion 21c on the vehicle interior side are positioned close to each other in the width direction (so that, for example, as shown in Fig. 6, they at least partially overlap in the width direction). As a result, by the same mechanism as in the first embodiment, the locally thicker portions 21b and 21c tend to become nodes in the vibration mode of the roof structure 2, reducing vibrations propagating from the air conditioning unit 5 to the roof structure 2 and vibrations propagating further from the roof structure 2 to the ceiling interior material 6 and the side ceiling interior material 7. This reduces noise propagating inside the vehicle.

[0026] In this way, it is desirable to provide the locally thickened portions 21b, 21c as close to each other as possible, but depending on the width dimension of the air conditioning unit 5 and its positional relationship with the width dimensions of the interior materials 6 and 7, it may be difficult to provide the fastening portions 22, 23 close to each other. In such cases, the effects of the present invention are not necessarily lost even if the locally thickened portions 21b, 21c are not necessarily provided above and below adjacent trusses, as shown in Figure 5. For example, it is also possible to arrange the locally thickened portions 21b, 21c with a gap of one or two trusses in the width direction.

[0027] Furthermore, in Figures 5 and 6, the locally thick portions 21b and 21c are illustrated as having a length equivalent to one truss in the width direction, but this is not limited to this case and is equally effective even if they are provided with a length equivalent to two trusses in the width direction or some other length.

[0028] Furthermore, in the first and second embodiments, an air conditioning unit has been used as an example of rooftop equipment, but other examples of rooftop equipment include a current collector, and the same configuration applies in this case as well. Therefore, the structure described in the first and second embodiments of the present invention makes it possible to reduce interior noise caused by vibrations from other rooftop equipment such as a current collector.

[0029] In addition, the locally thickened portions 21, 21a, 21b, 21c, etc. shown in the first and second embodiments do not necessarily need to be provided over the entire length of the vehicle in the longitudinal direction, and the effects of the present invention can be fully achieved even if they are provided only in the area where the roof-mounted equipment is present. In such cases, this can be achieved by cutting away the unnecessary portions (areas where no roof-mounted equipment is present) later, or by welding only the necessary portions. This can reduce the weight.

[0030] This specification includes the disclosure of the following inventions. (First aspect) A railway vehicle having a roof structure including an extruded member made up of an outer plate and an inner plate opposed to each other with a gap therebetween, and a connecting rib connecting the two plates, A railway vehicle, characterized in that a reinforcing portion having a thickness greater than that of the extruded member is disposed on a portion of the roof structure in the vehicle width direction.

[0031] (Second aspect) In the rail vehicle of the first aspect, The reinforcing portion is extruded integrally with the extruded material. A rail vehicle characterized by:

[0032] (Third aspect) In the rail vehicle of the second aspect, The reinforcement portion has a cylindrical peripheral wall, and the extruded material is joined to both sides of the peripheral wall in the vehicle width direction. A rail vehicle characterized by:

[0033] (Fourth aspect) In the rail vehicle of the third aspect, The peripheral wall has a plurality of ribs extending radially from the center of the peripheral wall on the inside thereof, and outer ends of the ribs are connected to the inner periphery of the peripheral wall. A rail vehicle characterized by:

[0034] (Fifth aspect) In the rail vehicle of the first aspect, The reinforcement portion includes a first reinforcement portion joined to an outer plate of the extruded material and a second reinforcement portion joined to an inner plate of the extruded material. A rail vehicle characterized by:

[0035] (Sixth aspect) In the rail vehicle of the fifth aspect, the first reinforcement portion has a small truss structure having a part of the outer panel of the extruded material as a component, The second reinforcement portion has a small truss structure that uses a part of the inner plate of the extruded material as a component. A rail vehicle characterized by:

[0036] (Seventh aspect) In the rail vehicle of the sixth aspect or the seventh aspect, The first reinforcement portion and the second reinforcement portion at least partially overlap each other in the vehicle width direction. A rail vehicle characterized by:

[0037] (Eighth aspect) In the railway vehicle of any one of the first to seventh aspects, a housing for accommodating roof-mounted equipment is installed on the roof structure; The reinforcement portion is provided with at least one of a fastening portion for attaching the housing and a fastening portion for attaching an interior material. A rail vehicle characterized by: [Explanation of symbols]

[0038] 1...railroad vehicle, 2...roof structure, 3...side structure, 4...floor structure, 5...air conditioning unit, 5a...air conditioning unit housing, 6...ceiling interior material, 7...side ceiling interior material, 8...lighting fixture, 9...side interior material, 10...interior floor, 11...seat, 12...luggage shelf, 13...air conditioning fan, 14...fastening part, 15...fastening part, 21...locally thick portion, 22...fastening part, 23...fastening part

Claims

1. A railway vehicle having a roof structure including an extruded member made up of an outer plate and an inner plate opposed to each other with a gap therebetween, and a connecting rib connecting the two plates, A railway vehicle, characterized in that a reinforcing portion having a thickness greater than that of the extruded member is disposed on a portion of the roof structure in the vehicle width direction.

2. The railway vehicle according to claim 1, The reinforcing portion is extruded integrally with the extruded material. A rail vehicle characterized by:

3. The railway vehicle according to claim 2, The reinforcement portion has a cylindrical peripheral wall, and the extruded material is joined to both sides of the peripheral wall in the vehicle width direction. A rail vehicle characterized by:

4. The railway vehicle according to claim 3, The peripheral wall has a plurality of ribs extending radially from the center of the peripheral wall on the inside thereof, and outer ends of the ribs are connected to the inner periphery of the peripheral wall. A rail vehicle characterized by:

5. The railway vehicle according to claim 1, The reinforcement portion includes a first reinforcement portion joined to an outer plate of the extruded material and a second reinforcement portion joined to an inner plate of the extruded material. A rail vehicle characterized by:

6. The railway vehicle according to claim 5, the first reinforcement portion has a small truss structure having a part of the outer panel of the extruded material as a component, The second reinforcement portion has a small truss structure having a part of the inner plate of the extruded material as a component. A rail vehicle characterized by:

7. 7. The railway vehicle according to claim 6, The first reinforcement portion and the second reinforcement portion at least partially overlap each other in the vehicle width direction. A rail vehicle characterized by:

8. The railway vehicle according to any one of claims 1 to 7, a housing for accommodating roof-mounted equipment is installed on the roof structure; The reinforcement portion is provided with at least one of a fastening portion for attaching the housing and a fastening portion for attaching an interior material. A rail vehicle characterized by:

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