Structural components of railway vehicles and railway vehicles

Abstract

To provide a thin structural member which contributes to the improvement of assemblability of a vehicle body, is light-weight and has high rigidity, and a railroad vehicle that forms a floor surface with an underframe structure with such a structural member.SOLUTION: A body bolster of a railroad vehicle includes: a plurality of radial ribs arranged radially from the center of a vertical load input unit and having a shape of a protrusion on the surface of a flat plate arranged horizontally with a curvature provided in the longitudinal or width direction of a vehicle more gently as it moves away from the center of the vertical load input unit; and a circular rib arranged intermittently around a vertical load input seating surface so as to overlap the plurality of radial ribs.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a structural member of a railway vehicle and a railway vehicle, and particularly to a structural member of a railway vehicle capable of securing a space between a bolster and a underframe, and a railway vehicle including the same.

Background Art

[0002] Generally, a vehicle body (hereinafter sometimes referred to as a body) is a hexahedral structure composed of an underframe forming a floor surface, side bodies disposed at both ends in the width direction of the underframe, roof bodies disposed at both ends in the longitudinal direction of the underframe, and a roof body disposed above the side bodies and the roof bodies.

[0003] The underframe has side beams provided along its longitudinal direction at both ends in the width direction of the underframe, end beams connecting both ends in the longitudinal direction of the side beams, bolster beams provided along the end beams at a position a predetermined distance from the longitudinal ends of the body, and center beams disposed along the longitudinal direction of the body for connecting the end beams and the bolster beams to the body.

[0004] A center pin provided along the vertical direction of the body on the lower surface of the bolster beam is connected to a bogie frame constituting a bogie. When the vehicle accelerates and decelerates, a load in the longitudinal direction of the vehicle is transmitted from the bogie to the bolster beam via the center pin.

[0005] On the other hand, from the viewpoint of improving the assembly property of railway vehicles, it is required to facilitate the attachment of wiring and ducts attached under the floor. In order to facilitate the attachment, it is effective to provide a certain space between the underframe and the bolster beam and assemble it to the body with the bolster beam mounted on the bogie. As such a bogie structure equipped with a bolster beam, in Patent Documents 1 and 2, bogies equipped with a bolster beam bolted only to the side beam have been proposed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] In the underframe structure of railway vehicles, torsional deformation occurs in the bolster beam due to moment loads transmitted from the bogie to the bolster beam via the center pin. In addition, vertical loads are transmitted from the bogie to the bolster beam via air springs due to vertical vibrations during operation and the weight of the vehicle and passengers. As a result, bending deformation occurs in the bolster beam. Furthermore, it is necessary to avoid excessive stress concentration in response to these moment and vertical loads and to ensure sufficient strength of the bolster beam. In the bogie structures equipped with bolster beams described in Patent Documents 1 and 2, the bolster beam structure is composed of ribs and face plates with a uniform cross-section along the width direction of the vehicle body. As a result, the weight of the bolster beam increases, and the size of the space between the bolster beam and the underframe may be restricted.

[0008] This invention has been made in view of the circumstances of the prior art, and its purpose is to provide a railway vehicle in which the bolster beam is constructed from a thin structural member that is lightweight, highly rigid, and has sufficient strength, and the floor surface is constructed from a frame structure equipped with such structural member, while also contributing to improved assembly of the vehicle body. [Means for solving the problem]

[0009] One embodiment of a railway vehicle that solves the above objective is a bolster beam of a railway vehicle having a plurality of radial ribs arranged radially from the center of the vertical load input section, each having a protruding shape on the surface of a horizontally arranged flat plate, and having a curvature that gradually follows the longitudinal or width direction of the vehicle as it moves away from the center of the vertical load input section, and circular ribs intermittently arranged around the vertical load input seating surface so as to overlap the plurality of radial ribs. [Effects of the Invention]

[0010] According to the present invention, the structural member and the railway vehicle having a frame structure equipped therewith, which constitute the floor, allow for weight reduction and thinning while maintaining the strength and rigidity of the structural member against vertical loads and moment loads. In particular, when the present invention is applied to a bolster beam, as a result of weight reduction and thinning while maintaining strength and rigidity, it is possible to secure a predetermined space between the bolster beam and the frame, and to provide a frame structure and railway vehicle with improved body assembly. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view of a railway vehicle whose floor surface is formed by a frame structure with a bolster beam according to Example 1. [Figure 2] This is a perspective view of the underside of a vehicle structure whose floor surface is formed by a frame structure with bolster beams according to Example 1. [Figure 3] This is a cross-sectional view showing the positional relationship between the frame equipped with a bolster beam and the bogie according to Embodiment 1. [Figure 4] This figure shows the appearance of the upper surface of the pillow beam according to Example 1. [Figure 5] This figure shows the appearance of the underside of the pillow beam in Example 1. [Figure 6] This figure shows the appearance of the underside of the pillow beam in Example 2. [Figure 7] This figure shows the appearance of the underside of the pillow beam in Example 3. [Modes for carrying out the invention]

[0012] This invention relates to a structure in which a certain space is provided between the underframe and the bolster beam, and the bolster beam is bolted to the side beams and central beam. The following examples will be described with reference to the drawings. The direction of travel or longitudinal direction (front-to-back direction) of the railway vehicle 100 is the X direction, the width direction (left-to-right direction) of the railway vehicle 100 is the Y direction, and the height direction (up-down direction) of the railway vehicle 100 is the Z direction. Hereinafter, these may simply be referred to as the X direction, Y direction, and Z direction. [Examples]

[0013] FIG. 1 is a side view of the railway vehicle 100 of Example 1. FIG. 2 is a bottom side perspective view of the vehicle body structure 1 of Example 1. In this embodiment, the bolster 9 is characterized by a structural member to which the proposed rib arrangement is applied. FIG. 3 is a view showing the A-A cross section of FIG. 1.

[0014] The railway vehicle 100 includes a vehicle body structure 1 and bogies 2 on which the vehicle body structure 1 is mounted.

[0015] The vehicle body structure 1 is a hexahedral structure composed of a floor frame ③, side structures ④ arranged at both ends in the width direction of the floor frame ③, gable structures ⑤ arranged at both ends in the longitudinal direction of the floor frame, and a roof structure ⑥ arranged above the side structures ④ and the gable structures ⑤. The side structure ④ includes windows and side sliding doors for passengers to board and alight.

[0016] The floor frame ③ is a planar structure composed of a peripheral portion having end beams ⑧ provided at both ends in the x direction of the floor frame ③ and side beams ⑦ provided at both ends in the y direction of the floor frame ③, and a floor structure having this peripheral portion as an outer edge. The floor frame ③ has a pair of bolster beams ⑨ provided along the y direction at a portion supported by the bogie 2. One end beam ⑧ and one bolster beam ⑨ are connected by a pair of center beams ⑩ provided along the x direction.

[0017] The floor frame ③ includes side beams ⑦, end beams ⑧, bolster beams ⑨, and center beams ⑩. The side beams ⑦ are provided along the longitudinal direction (X direction) at both ends in the width direction (Y direction) of the floor frame ③. The end beams ⑧ connect both ends in the longitudinal direction (X direction) of the side beams ⑦. The bolster beams ⑨ are provided along the width direction (Y direction) of the floor frame ③ at a position at a predetermined distance from the longitudinal direction (X direction) end of the vehicle body structure 1. The center beams ⑩ are arranged along the longitudinal direction (X direction) of the vehicle body structure 1 so as to connect the end beams ⑧ and the bolster beams ⑨. The bolster beam ⑨ functions to support the weight of the vehicle body structure 1 and rotate the railway vehicle 100.

[0018] The bogie 2 is arranged below the bolster 9 and is provided so as to be rotatable with respect to the car body frame 3 around the center pin 11 along the Z direction in the horizontal plane. The bogie 2 includes a bogie frame 12 and wheels 13 fixed to both ends of an axle that is rotatably held with respect to the bogie frame 12. The bogie 2 supports the car body frame 3 via air springs (shock-absorbing members) 14 provided on both sides in the Y direction near the center in the X direction.

[0019] The center pin 11 provided along the vertical direction of the structure 1 on the lower surface of the bolster 9 is connected to the bogie frame 12. When the vehicle accelerates and decelerates, a load in the longitudinal direction of the vehicle is transmitted from the bogie 2 to the bolster 9 via the center pin 11.

[0020] As shown in FIG. 3, the bolster 9 is installed between the bogie 2 and the car body frame 3.

[0021] The space 15 is a space provided between the car body frame 3 and the bolster 9. This space 15 can be utilized as spaces 15a and 15b for arranging various members and components such as pipes, ducts, sensors, and vibration isolators. By thinning the bolster 9, the space 15 can be expanded, facilitating the installation of pipes, ducts, sensors, and vibration isolators.

[0022] [[ID=1\6]]FIG. 4 is a perspective view showing the upper surface of the bolster 9 as Example 1, and FIG. 5 is a perspective view showing the lower surface of the bolster 9 as Example 1.

[0023] The fastening portion 16 of the bolster 9 is a portion for fixing the side beams 7 and the center beam 10 to the bolster 9 with bolts or the like. The fastening portion 16 is located at both ends and near the center in the Y direction of the structure 1, and fixes the side beams 7 and the center beam 10 to the bolster 9. The air spring seat surface 17 (see FIG. 5) of the bolster 9 transmits a load to the upper side of the air spring 14 of the bogie 2 as a vertical load input portion.

[0024] At the central hole portion 18 of the bolster 9, the bolster 9 is connected to the center pin 11. Due to acceleration and deceleration of the railway vehicle, a moment load around the Y direction is input from the center pin 11 to the periphery of the central hole portion. In the bolster 9, it is required to ensure rigidity against such a moment load.

[0025] The bolster beam 9 has two air spring support holes 19, and the bolster beam 9 receives the vertical load transmitted from the air spring 14 at the air spring seating surface 17 (vertical load input section) around each air spring support hole 19. The air spring support holes 19 are located at the center of the vertical load input section. The bolster beam 9 is required to have strength and rigidity against such vertical loads. In addition, the bolster beam 9 is provided with numerous bolt holes for fastening to the side beams 7 and the central beam 10 via bolts, etc.

[0026] As shown in Figure 4, radial ribs 20 are arranged on the upper surface of the bolster beam 9 from the air spring support holes 19. The radial ribs 20 are given a curvature such that they gradually conform to the X or Y direction as they move away from the air spring support holes 19 located at the center of the vertical load input section (air spring seating surface) 17 that supports the air spring 14. In other words, each radial rib 20 is provided radially from the air spring support hole 19 toward each side which is the end of the bolster beam 9, and at the point where it intersects with each side which is the end of the bolster beam 9, it forms a curve that intersects perpendicularly with each side.

[0027] The bolster beam 9 has side beam contact portions 7a provided along the x-direction at both ends of the bolster beam 9 in the y-direction and in contact with the side beam 7, a central beam contact portion 10a provided along the x-direction at the center of the bolster beam 9 in the y-direction and in contact with the central beam 10, and an air spring contact portion provided between the side beam contact portion 7a and the central beam contact portion 10a.

[0028] In the bolster beam 9, the pair of air spring contact portions that the bogie's air springs contact have a symmetrical shape with respect to the central beam contact portion 10a. The air spring contact portion has an air spring center 19 in its approximate center, which corresponds to the center of the air spring 14 provided by the bogie 2.

[0029] The bolster beam 9 has an x-direction rib (longitudinal rib) 23 extending in the x direction at approximately the center position between the central beam abutment portion 10a and the vertical load input portion (air spring seating surface) 17. In other words, the bolster beam 9 has an x-direction rib extending in the x direction between the central beam abutment portion 10a, which is located at the center of the width direction (y direction) of the railway vehicle 100, and the vertical load input portion 17, which is in contact with the air spring 14, which is a buffer member.

[0030] This arrangement of radial ribs 20 allows for stress relief around the air spring support holes 19 under vertical loads, ensuring bending rigidity, and ensuring torsional rigidity against torsional moments, all while suppressing an increase in plate thickness and weight.

[0031] Furthermore, a circular rib 21 is provided above the radial rib 20, overlapping the radial rib 20, around the air spring support hole 19 on the upper surface of the bolster beam 9. The circular rib 21 has a discontinuous shape, with the height of the radial rib 20 being non-continuous. Around the air spring support hole 19, it has the same shape as the radial rib 20, increasing the height of the radial rib 20 in the peripheral area near the air spring support hole 19. The height of the discontinuous circular rib 21 is approximately twice the height of the radial rib 20 alone.

[0032] Furthermore, the intermittent circular ribs 21 are arranged so that their outer diameter is larger than the outer diameter of the air spring seating surface 17 (the outer diameter is no more than twice the outer diameter of the air spring seating surface 17), thereby easing the stress around the air spring support holes 19 and the air spring seating surface under vertical load.

[0033] Since the stress on the pillow beam 9 is high near the straight line connecting the two air spring support holes 19, the intermittent circular ribs in section 21a are made wider than the width of the radial ribs 20.

[0034] In addition to the arrangement of radial ribs 20 and intermittent circular ribs 21, the x-direction ribs 23 allow the bolster beam 9 to relax stress around the air spring support holes 19 under vertical loads, ensure bending rigidity, and ensure torsional rigidity against torsional moments. As a result, the radial ribs 20 and circular ribs 21 can suppress the width and thickness (z-direction), and there is no need to provide x-direction edge ribs (longitudinal edge ribs) 26 in the region 25 near the mid-beam abutment portion 10a, thus suppressing increases in plate thickness and weight. In other words, the x-direction edge ribs 26 have a notch 25 near the center of the width direction (y-direction) of the bolster beam 9 near the mid-beam abutment portion 10a.

[0035] Furthermore, in the bolster beam 9, it is necessary to drain water that accumulates in recesses of the radial ribs 20 or intermittent circular ribs 21 through drainage holes 22. Since it is difficult to provide drainage holes 22 on the air spring seating surface 17, the gaps between the intermittent circular ribs 21 are used as a flow path to drainage holes 22 located outside the air spring seating surface 17, thereby draining the water. In particular, recesses surrounded by a part of the radial ribs 20 and the x-direction ribs (longitudinal ribs) 23 cannot be drained, so drainage holes 22 are provided in these recesses. [Examples]

[0036] The bolster beam 9 shown in Figure 6 as Example 2 has a shape similar to the bolster beam structure of Example 1, but with notches 24 added to the intermittent circular ribs 21, as shown in the appearance of the bolster beam 9. When the stress and torsional moment around the air spring support holes 19 under vertical load were analyzed using the bolster beam structure of Example 1, the analysis results showed that the stress was high near the straight line connecting the two air spring support holes 19, and that the stress and torsional moment decreased when a certain distance was moved away from the air spring support holes 19 in the x direction. As a result, the radial ribs 22 alone can relieve the stress around the air spring support holes 19 under vertical load, ensure bending rigidity, and ensure torsional rigidity against torsional moment. Therefore, in order to suppress an increase in plate thickness and weight, notches 24 are provided in the intermittent circular ribs 21.

[0037] As shown in Figure 6, the notches 24 are provided in locations that have little impact on the overall rigidity and strength of the bolster beam 9. Specifically, the notches 24 are positioned over an angular range of ±30° or more, with the angle θ between the intermittently arranged circular ribs being 0°, when the origin is the center of the two air spring seating surfaces (corresponding to the center of the air spring support hole 19) and the direction from the origin toward the center of the central pin 11 is defined as 0°. In Figure 6, the notches 24 are not provided on the radial ribs 20 where θ is ±30° or more, but theoretically, the notches 24 can be provided on the radial ribs 20 where θ is ±30° or more, thereby further reducing the weight of the bolster beam 9.

[0038] The shape of these intermittent circular ribs 21 allows for stress relief around the air spring support holes 19 under vertical loads, ensuring bending rigidity, and ensuring torsional rigidity against torsional moments, all while suppressing an increase in plate thickness and weight. [Examples]

[0039] The pillow beam 9 shown in Figure 7 as Example 3 is configured such that, instead of the intermittent circular ribs 21 of Example 2, the height of the radial ribs 20 decreases as it moves away from the air spring support hole 19. The recess surrounded by the radial ribs 20 and the x-direction ribs (longitudinal ribs) 23 has drainage holes 22 for drainage.

[0040] In Example 3, in addition to the arrangement of radial ribs 20 and intermittent circular ribs 21, the x-direction ribs 23 allow the pillow beam 9 to relieve stress around the air spring support holes 19 under vertical loads, ensure bending rigidity, and ensure torsional rigidity against torsional moments. This makes it possible to provide notches 25 in the x-direction edge ribs 26 and suppress an increase in weight.

[0041] Furthermore, since the stress on the pillow beam 9 is high near the straight line connecting the two air spring support holes 19, if sufficient rigidity can be obtained by making the intermittent circular ribs 21a larger than the width of the radial ribs 20, the height of the radial ribs 20 and the intermittent circular ribs 21 can be made the same. By adopting such a shape, processing costs are reduced compared to Examples 1 and 2.

[0042] As explained above, the arrangement of the radial ribs 20 and circular ribs 21 of the bolster beam 9 allows for stress relief around the air spring support holes 19 under vertical loads, ensuring bending rigidity, and ensuring torsional rigidity against torsional moments, all while suppressing increases in plate thickness and weight. Furthermore, it allows for the securing of space between the bolster beam 9 and the frame 3.

[0043] By securing this space 15, it becomes easy to arrange various components and parts such as pipes, ducts, sensors, and vibration damping materials in the space 15 even after the central beam 10 and the bolster beam 9 have been fastened together with bolts. [Explanation of Symbols]

[0044] 1: Structure 2: Dolly 3: Frame 4: Side structure 5: Wife structure 6: Roof structure 7: Side beam 8: End beam 9: Pillow beam 10: Nakabashi 11: Center pin 12: Bogie frame 13: Wheels 14: Air spring 15: Space 16: Fastening section 17: Air spring seat 18: Central hole 19: Air spring support hole 20: Radial ribs 21: Intermittent circular ribs 22: Drainage hole 23: x-direction ribs 24: Notch 26: x-direction edge ribs

Claims

1. In a bolster beam member provided in the underframe structure that constitutes the floor of a vehicle body, Arranged radially from the center of the vertical load input section, Having a protruding shape on the surface of a flat plate arranged horizontally, Multiple radial ribs, each with a curvature that gradually follows the longitudinal or widthwise direction of the vehicle as it moves away from the center of the vertical load input section, A circular rib is partially arranged around the vertical load input surface so as to overlap with the plurality of radial ribs, and its height is discontinuous at the top of the radial ribs. A pillow beam member characterized by having the following features.

2. A base frame that extends in the longitudinal direction and forms the floor surface, Side structures arranged at both ends of the frame, End structures are arranged at both ends in the longitudinal direction of the aforementioned frame, A structure having the side structure and a roof structure positioned on the upper part of the gable structure, It has a trolley on which the aforementioned structure is mounted, A bolster beam located below the frame, corresponding to the position of the bogie in the longitudinal direction, Multiple cushioning members that receive a vertical load from the frame to the trolley, In a railway vehicle equipped with, The aforementioned pillow beam is Arranged radially from the center of the vertical load input portion to the cushioning member, Having a protruding shape on the surface of a flat plate arranged horizontally, Multiple radial ribs, each with a curvature that gradually follows the longitudinal or widthwise direction of the vehicle as it moves away from the center of the vertical load input section, A circular rib is partially arranged around the vertical load input surface so as to overlap with the plurality of radial ribs, and its height is discontinuous at the top of the radial ribs. A railway vehicle characterized by having the following features.

3. In the railway vehicle described in claim 2, The radial ribs are formed by curves that intersect each side of the purlin beam perpendicularly. A railway vehicle characterized by the following features.

4. In the railway vehicle described in claim 3, The bolster beam has a central beam abutment portion located at the center in the width direction of the railway vehicle, Between the vertical load input section and the central beam contact section, a longitudinal rib extending in the longitudinal direction of the railway vehicle, Near the abutment portion of the central beam, the purlin beam has a longitudinal edge rib with a notch near the center in the width direction. A railway vehicle characterized by the following features.

5. In the railway vehicle described in claim 4, The outer diameter of the circular rib is larger than the outer diameter of the seating surface of the air spring that contacts the vertical load input portion. A railway vehicle characterized by [this feature].

6. In the railway vehicle described in claim 5, The outer diameter of the circular rib is no more than twice the outer diameter of the air spring seating surface. A railway vehicle characterized by [this feature].

7. In the railway vehicle described in claim 6, The intermittently arranged circular ribs are When the center of the two rib air spring seating surfaces is taken as the origin, and the direction from the origin toward the center of the central pin is defined as 0°, there is a notch at an angle of ±30° or more. A railway vehicle characterized by [this feature].

8. In the railway vehicle described in claim 5, The aforementioned pillow beam is The recess, surrounded by a portion of the plurality of radial ribs and the longitudinal ribs, has drainage holes near the longitudinal ribs. A railway vehicle characterized by [this feature].

9. In the railway vehicle according to claim 8, Of the circular ribs, the circular ribs near the straight line connecting the centers of the two air spring seating surfaces are configured to be wider than the width of the radial ribs. A railway vehicle characterized by [this feature].

Images