Receiving the seat

Abstract

To provide a seat that can be made lighter while ensuring strength reliability. [Solution] A receiving seat (10) for mounting a functional component for a railway vehicle includes a pair of side plates (12, 13) and a top plate (11). The pair of side plates (12, 13) face each other. The top plate (11) is connected to each of the side plates (12, 13) and connects the side plates (12, 13) to each other. Each of the side plates (12, 13) is connectable to a cross beam (22) of the railway vehicle. A through hole (12a, 13a) is formed in a region (122, 132) of at least one of the side plates (12, 13) on the side connected to the cross beam (22).

Description

[Technical Field]

[0001] The present disclosure relates to a seat for mounting a functional component for a railway vehicle. [Background technology]

[0002] A railway vehicle comprises a bogie that runs on rails and a carbody supported on the bogie. The bogie includes a bogie frame as a framework. The bogie frame includes a pair of side beams and a cross beam. The bogie further includes functional parts such as a brake caliper, a unit brake, a motor, or a gear device to realize the function of the bogie. The functional parts are attached to a receiving seat. The receiving seat is joined to the cross beam, for example, by welding.

[0003] Patent Document 1 discloses a composite bracket (seat) that is welded to the cross beam of a bogie frame for a railway vehicle. The composite bracket has a motor suspension bracket that supports the motor and a gearbox suspension bracket that supports the gearbox. The motor suspension bracket and the gearbox suspension bracket have an integrated common base. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-81308 Summary of the Invention [Problem to be solved by the invention]

[0005] A striker is usually manufactured by combining multiple plate members. The heavier the plate member, the worse the transportability of the plate member. Therefore, it is preferable to reduce the weight of the plate member. However, simply reducing the weight of the plate member may reduce the strength reliability of the striker.

[0006] An object of the present disclosure is to provide a catch that can be made lighter while ensuring strength reliability. [Means for solving the problem]

[0007] The receiving seat for mounting a functional component for a railway vehicle according to the present disclosure includes a pair of side plates and a top plate. The pair of side plates face each other. The top plate is connected to each of the side plates, connecting the side plates together. Each of the side plates is connectable to a cross beam of the railway vehicle. A through hole is formed in an area of ​​at least one of the side plates that is connected to the cross beam. [Effects of the Invention]

[0008] According to the catch according to the present disclosure, it is possible to achieve weight reduction while ensuring strength reliability. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a top view of a bogie frame of a railway vehicle. [Figure 2] FIG. 2 is a perspective view of the catch according to the embodiment. [Figure 3] FIG. 3 is a side view of the catch according to the embodiment. [Figure 4] FIG. 4 is a side view of the catch according to the embodiment. [Figure 5] FIG. 5 is a perspective view of a catch seat of a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0010] A receiving seat for mounting a functional component for a railway vehicle according to an embodiment includes a pair of side plates and a top plate. The pair of side plates face each other. The top plate is connected to each of the side plates, connecting the side plates together. Each of the side plates is connectable to a cross beam of the railway vehicle. A through hole is formed in an area of ​​at least one of the side plates that is connected to the cross beam (first configuration).

[0011] In the striker according to the first configuration, a through hole is formed in at least one of the side plates. This allows the volume of the side plate to be reduced compared to when no through hole is formed in the side plate, thereby making the striker lighter. The through hole is formed in the region of the side plate that is connected to the cross beam. The region of the side plate that is connected to the cross beam is an area that has little effect on the maximum stress generated in the striker. Therefore, even if a through hole is formed in this area, the maximum stress generated in the striker is unlikely to increase, and the strength reliability of the striker can be maintained. Therefore, with the striker according to the first configuration, the weight of the striker can be reduced while ensuring the strength reliability of the striker.

[0012] In the seat of the first configuration, the functional part is a brake caliper, a unit brake, a motor, or a gear device (second configuration).

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or equivalent components are designated by the same reference numerals, and the same description will not be repeated.

[0014] 1 is a top view of a bogie frame 20 of a railway vehicle in which a catch 10 according to this embodiment is used. Referring to FIG. 1, the bogie frame 20 includes a pair of side beams 21 and a cross beam 22.

[0015] The pair of side beams 21 are arranged with a gap in the left-right direction of the railway vehicle. Each of the side beams 21 extends in the fore-and-aft direction of the railway vehicle. The cross beam 22 extends in the left-and-right direction of the railway vehicle. The cross beam 22 is arranged between the pair of side beams 21 in the left-and-right direction of the railway vehicle and connects the side beams 21 to each other. The cross beam 22 is joined to each of the side beams 21 by welding, for example.

[0016] The catch 10 is used to mount a functional part (not shown) for a railway vehicle. The functional part is, for example, a brake caliper, a unit brake, a motor, or a gear device. The catch 10 is joined to a cross beam 22 by welding. In the example of FIG. 1, the catch 10 is joined to both sides of the cross beam 22 in the longitudinal direction of the railway vehicle.

[0017] 2 is a perspective view of the catch seat 10 according to this embodiment. In the following description, when referring to the top, bottom, left, right, and front and rear of the catch seat 10, these refer to the top, bottom, left, right, and front and rear of the railway vehicle including the catch seat 10.

[0018] Referring to FIG. 2, the catch 10 includes a top plate 11 and a pair of side plates 12 and 13.

[0019] The top plate 11 is provided on the upper part of the catch 10. When viewed from above the catch 10, the top plate 11 is, for example, substantially rectangular, but may have other shapes. The top plate 11 may be provided with bolt holes 11a. The bolt holes 11a are used, for example, to fasten a functional component to the catch 10 with a bolt.

[0020] The top plate 11 is connected to each of the side plates 12, 13, and connects the side plates 12, 13 to each other. The side plates 12, 13 are disposed below the top plate 11. In the example of FIG. 2, the side plates 12, 13 are separate members from the top plate 11. The side plates 12, 13 are joined to the top plate 11 by welding. Specifically, the upper end surfaces of the side plates 12, 13 are joined to the underside of the top plate 11 by welding.

[0021] The side plates 12, 13 face each other in the left-right direction. The side plates 12, 13 may have a symmetrical shape in the left-right direction, or may have an asymmetrical shape. Each of the side plates 12, 13 is connectable to a cross beam 22 (FIG. 1). For example, one end 121 of the side plate 12 in the front-rear direction is joined to the cross beam 22 by welding. Similarly, one end 131 of the side plate 13 in the front-rear direction is joined to the cross beam 22 by welding. A through hole is formed in at least one of the side plates 12, 13. For example, at least one through hole 12a is formed in the side plate 12. In this embodiment, a plurality of through holes 12a are formed in the side plate 12. Each of the through holes 12a penetrates the side plate 12 in the plate thickness direction.

[0022] 3 and 4 are side views of the catch seat 10 according to this embodiment. Fig. 3 is a side view of the catch seat 10 seen from the side plate 12 side. Fig. 4 is a side view of the catch seat 10 seen from the side plate 13 side.

[0023] 3, the through hole 12a is formed in a region 122 of the side plate 12. The region 122 is a region of the side plate 12 that is connected to the cross beam 22 (FIG. 1). The through hole 12a is typically located entirely within the region 122 of the side plate 12. When the side plate 12 is divided into two regions by a line connecting the upper end center P1 of the side plate 12 and the lower end center P2 of the side plate 12, the region 122 is a region located on the cross beam 22 side in a side view of the catch 10. The region 122 includes an end 121 of the side plate 12 that is connected to the cross beam 22.

[0024] It is preferable that the through holes 12a are formed in a position in the region 122 where the stress generated in the seat 10 when a functional component is attached to the seat 10 and the functional component is operated is relatively small. For example, stress tends to concentrate relatively easily in the corners 1211 formed at the upper and lower ends of the end 121 on the cross beam 22 (FIG. 1) side of the side plate 12. Therefore, it is preferable that the through holes 12a are formed in a position in the region 122 other than the corners 1211.

[0025] In this embodiment, each of the through holes 12a is formed at a position where it interferes with the end face of the side plate 12 on the cross beam 22 (FIG. 1) side. That is, the through holes 12a open toward the cross beam 22. More specifically, one of the through holes 12a is formed in the side plate 12 so as to open toward the cross beam 22 at an end 121 that is joined to the cross beam 22. The other through hole 12a is formed in the side plate 12 so as to open toward the cross beam 22 at a portion that is not directly joined to the cross beam 22. However, the through holes 12a do not necessarily have to open toward the cross beam 22.

[0026] The shape of the through hole 12a can be selected as appropriate. The through hole 12a may be circular, elliptical, polygonal, or any other shape when viewed from the side of the seat 10. However, from the viewpoint of suppressing stress concentration, it is preferable that the periphery of the through hole 12a is smooth when viewed from the side of the seat 10 and does not have any sharp parts.

[0027] When the side plate 12 has a plurality of through holes 12a as in this embodiment, the through holes 12a may have the same shape or different shapes, and the sizes of the through holes 12a may also be the same or different.

[0028] At least one through hole 13a can also be formed in the side plate 13. Referring to Fig. 4, in this embodiment, a single through hole 13a is formed in the side plate 13. The through hole 13a penetrates the side plate 13 in the plate thickness direction.

[0029] The through hole 13a is formed in a region 132 of the side plate 13. The region 132 is the region of the side plate 13 that is connected to the cross beam 22 (FIG. 1). The through hole 13a is typically located entirely within the region 132 of the side plate 13. When the side plate 13 is divided into two regions by a line connecting the center Q1 of the upper end of the side plate 13 and the center Q2 of the lower end of the side plate 13, the region 132 is the region located on the cross beam 22 side in a side view of the catch 10. The region 132 includes an end 131 of the side plate 13 that is connected to the cross beam 22.

[0030] It is preferable that the through holes 13a be formed in a position in the region 132 where the stress generated in the seat 10 when a functional component is attached to the seat 10 and the functional component is operated is relatively small. For example, stress tends to concentrate relatively easily in the corners 1311 formed at the upper and lower ends of the end 131 on the cross beam 22 (FIG. 1) side of the side plate 13. For this reason, it is preferable that the through holes 13a be formed in a position in the region 132 other than the corners 1311.

[0031] In this embodiment, the through hole 13a is formed at a position where it interferes with the end face of the side plate 13 on the cross beam 22 ( FIG. 1 ) side. That is, the through hole 13a opens toward the cross beam 22. More specifically, the through hole 13a is formed in the side plate 13 so as to open toward the cross beam 22 at the end 131 that is joined to the cross beam 22. However, the through hole 13a may also be formed in the side plate 13 so as to open toward the cross beam 22 at a portion that is not directly joined to the cross beam 22. Furthermore, the through hole 13a does not necessarily have to open toward the cross beam 22.

[0032] The shape of the through hole 13a can be selected as appropriate. The through hole 13a may be circular, elliptical, polygonal, or any other shape when viewed from the side of the seat 10. However, from the viewpoint of suppressing stress concentration, it is preferable that the periphery of the through hole 13a is smooth when viewed from the side of the seat 10 and does not have any sharp parts.

[0033] The through holes 13a may have the same shape as or a different shape from the through holes 12a (FIG. 3) formed in the side plates 12. The size of the through holes 13a may also be the same as or different from the size of the through holes 12a.

[0034] 〔effect〕 In the striker 10 according to this embodiment, through holes 12a, 13a are formed in the side plates 12, 13. This allows the volume of the side plates 12, 13 to be reduced compared to when the side plates 12, 13 do not have the through holes 12a, 13a, thereby reducing the weight of the striker 10. The through holes 12a, 13a are formed in regions 122, 132 of the side plates 12, 13 that are connected to the cross beam 22. The regions 122, 132 have little effect on the maximum stress generated in the striker 10. Therefore, even if the through holes 12a, 13a are formed in the regions 122, 132, the maximum stress generated in the striker 10 is unlikely to increase, and the strength reliability of the striker 10 can be maintained. Therefore, according to the striker 10 according to this embodiment, the weight of the striker 10 can be reduced while ensuring the strength reliability of the striker 10.

[0035] The through holes 12a, 13a are preferably formed in the regions 122, 132 at positions other than the corners 1211, 1311. In this case, the through holes 12a, 13a are formed at positions where stress is less likely to concentrate than at the corners 1211, 1311, and therefore the strength reliability of the catch 10 can be improved.

[0036] In the case where greater stress is generated on one side of the striker 10 in the left-right direction than on the other side, it is preferable that the size of the through hole 12a be different from the size of the through hole 13a. For example, in the case where relatively large stress is generated in the side plate 13 of the striker 10, it is preferable that the size of the through hole 13a be smaller than the size of the through hole 12a. This makes it possible to suppress a decrease in the strength of the side plate 13, which is subjected to relatively large stress, while reducing the weight of the side plate 12, which is subjected to relatively small stress. As a result, it is possible to ensure the strength reliability of the striker 10 as a whole and to reduce its weight.

[0037] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure.

[0038] In the above embodiment, the side plates 12, 13 are separate members from the top plate 11. However, the side plates 12, 13 may be provided integrally with the top plate 11. In this case, the side plates 12, 13 are continuous with the top plate 11, and no joints such as welds exist between the top plate 11 and the side plates 12, 13. Such top plate 11 and side plates 12, 13 are manufactured by, for example, forging, casting, additive manufacturing, or machining.

[0039] In the above embodiment, through holes 12a, 13a are formed in both side plates 12, 13. However, it is sufficient that through holes 12a, 13a are formed in at least one of side plates 12, 13. That is, through hole 12a may be formed in side plate 12, but through hole 13a may not be formed in side plate 13. Conversely, through hole 13a may be formed in side plate 13, but through hole 12a may not be formed in side plate 12.

[0040] In the above embodiment, two through holes 12a are formed in the side plate 12, and a single through hole 13a is formed in the side plate 13. However, the number of through holes 12a, 13a formed in the side plates 12, 13 is not limited to this. The side plate 12 may have a single through hole 12a, or three or more through holes 12a. The side plate 13 may have multiple through holes 13a. When the side plate 13 has multiple through holes 13a, these through holes 13a may have the same shape or different shapes. The through holes 13a may also have the same size or different sizes. A large number of relatively small through holes 12a, 13a may be formed in the side plates 12, 13 by, for example, punching. [Example]

[0041] The present disclosure will be described in more detail below with reference to examples, although the present disclosure is not limited to the following examples.

[0042] To confirm the effects of the present disclosure, a stress analysis using the finite element method (FEM analysis) was performed. In the analysis, an analytical model (example) of the catch 10 according to the above embodiment (FIGS. 2 to 4) was created, and the maximum stress generated at the joints (welds) between the top plate 11 and the side plates 12 and 13 of the catch 10, where stress tends to concentrate, was confirmed. The analysis was performed based on JIS E 4207:2019 using general-purpose structural analysis software (Abaqus Ver. 6.14.3, manufactured by Dassault Systèmes).

[0043] For comparison, an analytical model (comparative example) was also created for the seat shown in Figure 5, and a similar analysis was performed. The seat of the comparative example did not have through holes in the areas of the side plates 12 and 13 that are connected to the cross beams. The analytical conditions and results are shown in Table 1.

[0044] [Table 1]

[0045] Referring to Table 1, the striker 10 of the example had a smaller mass than the striker of the comparative example because through holes 12a, 13a were formed in regions 122, 132 of the side plates 12, 13 that were connected to the cross beam. Specifically, the mass of one side plate 12 of the example was 0.78 times the mass of one side plate 12 of the comparative example. The mass of the other side plate 13 of the example was 0.90 times the mass of the other side plate 13 of the comparative example. The total mass of the side plates 12 and 13 of the example was 0.84 times the total mass of the side plates 12 and 13 of the comparative example.

[0046] As a result of the analysis, the maximum stress generated in the catch 10 of the example was 3 MPa greater than the maximum stress generated in the catch of the comparative example. A difference in maximum stress of approximately 3 MPa is considered to be within the range of error due to the method of creating the mesh of the analytical model. In other words, the maximum stress generated in the catch 10 of the example, in which the through holes 12a and 13a are formed in the regions 122 and 132 of the side plates 12 and 13 connected to the cross beam, was equivalent to the maximum stress generated in the catch of the comparative example, in which no through holes are formed in the regions of the side plates 12 and 13 connected to the cross beam. This demonstrates that the catch 10 of the example is lighter while maintaining the same strength reliability as the catch of the comparative example. [Explanation of symbols]

[0047] 10: catch seat 11: Top plate 12, 13: Side panels 12a, 13a: Through hole 122,132:Area 22: Horizontal

Claims

1. A seat for mounting a functional part for a railway vehicle, A pair of side plates facing each other; a top plate connected to each of the side plates and connecting the side plates together; each of the side panels is connectable to a cross beam of the rail vehicle; A through hole is formed in an area of ​​at least one of the side plates that is connected to the cross beam.

2. The seat according to claim 1, The functional component is a brake caliper, a unit brake, a motor, or a gear device.

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