Receiving the seat

Abstract

To provide a catch that can be made lighter. [Solution] A receiving seat (10) for mounting a functional component is connected to a cross beam (22) of a railway vehicle. The receiving seat (10) 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) to connect the side plates (12, 13) together. The top plate (11) is provided with bolt holes (111a) for fastening the functional component with bolts. The top plate (11) is provided with a notch, a thin-walled portion, or a through-hole.

Description

[Technical Field]

[0001] The present disclosure relates to a seat connected to a cross beam of a rail vehicle for mounting a functional component. [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] The catch is usually manufactured by assembling a plurality of plate members. The heavier the plate members are, the more difficult they are to transport. Therefore, it is preferable that the plate members are lightweight.

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

[0007] A support seat for mounting a functional component according to the present disclosure is connected to a cross beam of a railway vehicle. The support seat 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 to connect the side plates. The top plate is provided with bolt holes for fastening the functional component with bolts. The top plate is provided with a notch, a thin-walled portion, or a through-hole. [Effects of the Invention]

[0008] According to the catch according to the present disclosure, weight reduction can be achieved. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a top view of a bogie frame of a railway vehicle in which a seat according to a first embodiment is used. [Figure 2] FIG. 2 is a perspective view of the catch according to the first embodiment. [Figure 3] FIG. 3 is a top view of the catch according to the first embodiment. [Figure 4] FIG. 4 is a perspective view of a catch according to the second embodiment. [Figure 5] FIG. 5 is a top view of the catch according to the second embodiment. [Figure 6] FIG. 6 is a perspective view of a catch according to the third embodiment. [Figure 7] FIG. 7 is a perspective view of a catch according to the third embodiment. [Figure 8] FIG. 8 is a perspective view of a catch seat of a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0010] The support seat for mounting a functional component according to this embodiment is connected to a cross beam of a railway vehicle. The support seat comprises 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 to connect the side plates together. The top plate has bolt holes for fastening the functional component with bolts. The top plate has a cutout portion, a thin portion, or a through hole (first configuration).

[0011] In the catch seat according to the first configuration, the top plate is provided with a notch, a thin portion, or a through hole, which reduces the mass of the top plate and allows the catch seat to be made lighter.

[0012] In the receiving seat of the first configuration, the notch, thin portion, or through hole is preferably provided in a position on the top plate where it does not affect the maximum stress generated in the receiving seat (second configuration).

[0013] In the catch seat according to the second configuration, the notch, thin-walled portion, or through-hole is provided in an area of ​​the top plate where the effect on the maximum stress generated in the catch seat is relatively small. Therefore, even if the notch, thin-walled portion, or through-hole is provided in the top plate, the maximum stress generated in the catch seat is unlikely to increase, and the strength reliability of the catch seat can be maintained.

[0014] In the receiving seat of the first or second configuration, the notch, thin-walled portion, or through-hole may be adjacent to one of the side plates (third configuration).

[0015] In the receiving seat of any of the first to third configurations, the cutout portion, thin-walled portion, or through hole may be provided in an area of ​​the top plate opposite the cross beam when the receiving seat is connected to the cross beam (fourth configuration).

[0016] In a support seat of any of the first to third configurations, when the support seat is connected to the cross beam, a notch, a thin-walled portion, or a through hole may be provided in each of the areas of the top plate on the cross beam side and the areas of the top plate between the bolt hole and one of the side plates (fifth configuration).

[0017] In the seat of any of the first to fifth configurations, the functional component may be a brake caliper, a unit brake, a motor, or a gear device (sixth configuration).

[0018] 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.

[0019] First Embodiment 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Referring to FIG. 2, the catch 10 includes a top plate 11 and a pair of side plates 12 and 13.

[0024] The top plate 11 is provided above the receiving seat 10. The top plate 11 is provided with bolt holes 111a. The bolt holes 111a are used to fasten functional components to the top plate 11 with bolts. The bolt holes 111a are through holes that penetrate the top plate 11 in the vertical direction. In the top plate 11, countersunk holes 111b are provided around the bolt holes 111a. The countersunk holes 111b have a shape that is recessed downward relative to the rest of the top plate 11.

[0025] 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 faces of the side plates 12, 13 are joined to the top plate 11 by welding.

[0026] 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 of the side plate 12 in the front-rear direction is joined to the cross beam 22 by welding. Similarly, one end of the side plate 13 in the front-rear direction is joined to the cross beam 22 by welding.

[0027] The following describes the configuration of the catch 10 according to this embodiment, particularly the top plate 11, in more detail, with reference to Fig. 3 in addition to Fig. 2. Fig. 3 is a top view of the catch 10.

[0028] As shown in FIG. 2, the top plate 11 includes an upper surface 11a, a lower surface 11b, a front surface 11c, a rear surface 11d, and side surfaces 11e and 11f. The upper surface 11a, the lower surface 11b, the front surface 11c, the rear surface 11d, and the side surfaces 11e and 11f each have a flat shape. The upper surface 11a is disposed on the opposite side of the side plates 12 and 13. A counterbore 111b is formed in the upper surface 11a. The lower surface 11b is disposed on the opposite side of the upper surface 11a in the vertical direction. The lower surface 11b is connected to the upper surface 11a via the front surface 11c, the rear surface 11d, and the side surfaces 11e and 11f.

[0029] The front surface 11c and the back surface 11d connect the upper surface 11a and the lower surface 11b at the front and rear of the top plate 11. The back surface 11d is arranged on the side of the cross beam 22 (Fig. 1) when the catch 10 is connected to the cross beam 22. The front surface 11c is arranged on the opposite side of the back surface 11d in the front-to-rear direction. The side surfaces 11e and 11f connect the upper surface 11a and the lower surface 11b at the left and right of the top plate 11. The side surface 11e is arranged on the side of the side panel 12. The side surface 11f is arranged on the side of the side panel 13.

[0030] In this embodiment, the table top 11 has a substantially U-shape when viewed in the front-rear direction.

[0031] The table top body 112 is a portion of the table top 11 that intersects in the up-down direction. The table top body 112 may be substantially perpendicular to the up-down direction. The table top body 112 is connected to each of the vertical walls 113, 114, and connects the vertical walls 113, 114 to each other.

[0032] The vertical walls 113, 114 face each other in the left-right direction. The vertical walls 113, 114 may have a symmetrical shape in the left-right direction, or may have an asymmetrical shape. The vertical walls 113, 114 are provided integrally with the tabletop main body 112. In other words, the vertical walls 113, 114 are continuous with the tabletop main body 112, and no joints such as welds exist between the tabletop main body 112 and the vertical walls 113, 114. Such a tabletop 11 is manufactured by, for example, forging, casting, additive manufacturing, or machining.

[0033] The top plate 11 includes cutouts 115a and 115b. The cutouts are cutouts formed across multiple adjacent surfaces, including the top surface 11a, the front surface 11c, the back surface 11d, the side surfaces 11e and 11f, and the joint surfaces between the top plate 11 and the side panels 12 or 13. The cutouts are recessed inward of the top plate 11 relative to the intersection line between imaginary planes extending from the multiple surfaces. In this embodiment, the cutout 115a is formed in the top plate 11 so as to extend across the top surface 11a, the front surface 11c, and the side surface 11e. The cutout 115a is recessed inward of the top plate 11 relative to the intersection line between the imaginary plane extending from the top surface 11a and the imaginary plane extending from the side surface 11e. The cutout 115a is also recessed inward of the top plate 11 relative to the intersection line between the imaginary plane extending from the top surface 11a and the imaginary plane extending from the front surface 11c. On the other hand, the notch 115b is formed in the top plate 11 so as to straddle the front surface 11c, the side surface 11f, and the joint surface between the top plate 11 and the side plate 13. The notch 115b is recessed inward of the top plate 11 from the intersection line between an imaginary plane extending from the joint surface between the top plate 11 and the side plate 13 and an imaginary plane extending from the front surface 11c. The notch 115b is also recessed inward of the top plate 11 from the intersection line between an imaginary plane extending from the joint surface between the top plate 11 and the side plate 13 and an imaginary plane extending from the side surface 11f.

[0034] The cutouts 115a and 115b are provided at positions different from the bolt hole 111a in the top plate 11. The cutouts 115a and 115b are also provided at positions different from the countersunk hole 111b. The cutouts 115a and 115b are provided in the top plate 11 at a distance from the bolt hole 111a so as not to interfere with at least the bolt hole 111a. The cutouts 115a and 115b may be located at a distance from the countersunk hole 111b in the top plate 11, or may be connected to the countersunk hole 111b.

[0035] The notches 115a and 115b are preferably located in a position on the top plate 11 that does not substantially affect the maximum stress generated in the catch 10. Whether the notches 115a and 115b are located in a position on the top plate 11 that does not substantially affect the maximum stress generated in the catch 10 can be determined, for example, by the following procedure. First, an analytical model of the catch 10 is created. A stress analysis (FEM analysis) is performed on this analytical model using general-purpose structural analysis software (Abaqus Ver. 6.14.3, manufactured by Dassault Systèmes) to examine the maximum stress generated in the catch. In the analysis, either the drive unit load test or the traction motor load test specified in JIS E 4208-1:2021 is selected depending on the type of functional component and the location where the functional component (catch 10) is attached, and the load conditions are set according to the selected load test. The magnitude of the load to be set conforms to JIS E 4207:2019. The analysis examines the maximum stress occurring in a specific region of the catch 10 where stress is known to be likely to concentrate. For example, the maximum stress occurring at the joint (weld) between the top plate 11 and the side plates 12 and 13 can be examined. Next, an analytical model of a catch 10 is created, having the same shape, dimensions, and material as the catch 10, except that the top plate 11 does not have a notch. The maximum stress occurring in this catch 10 is examined using the same procedure. If the error in the ratio of the maximum stress occurring in this catch 10 to the maximum stress occurring in the catch 10 is within 0.1, it can be determined that the notches 115a and 115b are located in a position that does not substantially affect the maximum stress occurring in the catch 10. The maximum stress occurring in the catch 10 is preferably below the allowable fatigue stress specified in JIS E 4207:2019.

[0036] In this embodiment, the cutout portion 115a is adjacent to the side plate 12. The cutout portion 115b is adjacent to the side plate 13. The cutout portions 115a and 115b may include areas of the top plate 11 that are joined to the side plates 12 and 13 in the left-right direction, for example.

[0037] 2 and 3, the cutout portions 115a and 115b may be provided in a region 116 of the top plate 11 on the opposite side from the cross beam 22 (FIG. 1) when the catch 10 is connected to the cross beam 22. The region 116 is a region located on the opposite side from the cross beam 22 when the top plate 11 is divided into two regions along a center line A in the front-to-rear direction of the top plate 11 in a top view of the catch 10. Parts of the cutout portions 115a and 115b may be located in the region 116 of the top plate 11, or the entire cutout portions 115a and 115b may be located in the region 116 of the top plate 11. In the example of this embodiment, the entire cutout portions 115a and 115b are provided in the region 116 of the top plate 11.

[0038] 〔effect〕 The catch seat 10 according to this embodiment has cutouts 115a and 115b provided in the top plate 11. Therefore, the mass of the top plate 11 is reduced, and the weight of the catch seat 10 can be reduced.

[0039] In this embodiment, the cutouts 115a and 115b are provided in an area 116 of the top plate 11 on the opposite side from the cross beam 22. The cutout 115a is adjacent to the side plate 12, and the cutout 115b is adjacent to the side plate 13. The positions where the cutouts 115a and 115b are provided are areas that have a relatively small effect on the maximum stress generated in the catch 10. Therefore, even if the cutouts 115a and 115b are provided in the top plate 11, the maximum stress generated in the catch 10 is unlikely to increase, and the strength reliability of the catch 10 can be maintained.

[0040] The top plate 11 may be provided with only one of the notch 115a adjacent to the side plate 12 and the notch 115b adjacent to the side plate 13. When greater stress occurs on one side of the catch 10 in the left-right direction than on the other side, it is preferable to provide the notch 115a or 115b on the side where the generated stress is relatively small. For example, when relatively large stress occurs on the side plate 13 side of the catch 10, the notch 115a can be provided adjacent to the side plate 12. This prevents a decrease in strength on the side plate 13 side of the top plate 11 where relatively large stress occurs, while reducing the weight of the side plate 12 side of the top plate 11 where relatively small stress occurs. As a result, the strength reliability of the entire catch 10 can be ensured and the weight can be reduced. Furthermore, when multiple notches 115a, 115b are provided in the top plate 11 and the notches 115a, 115b are adjacent to the side plates 12, 13, respectively, it is preferable that the notch provided on the side where the generated stress is relatively large is smaller than the notch provided on the side where the generated stress is relatively small.

[0041] Second Embodiment Fig. 4 is a perspective view of the catch seat 10A according to this embodiment. Fig. 5 is a top view of the catch seat 10A according to this embodiment. Referring to Figs. 4 and 5, the catch seat 10A differs from the catch seat 10 of the first embodiment in the configuration of the top plate 11. Specifically, in this embodiment, the top plate 11 includes the same cutout portion 115b as in the first embodiment, as well as other cutout portions 115c and 115d.

[0042] In this embodiment, the cutout 115c is formed in the top plate 11 so as to span the upper surface 11a and the side surface 11e. The cutout 115c is recessed inward of the top plate 11 from the intersection line between an imaginary plane extending from the upper surface 11a and an imaginary plane extending from the side surface 11e. The cutout 115d is formed in the top plate 11 so as to span the upper surface 11a, the rear surface 11d, and the side surface 11e. The cutout 115d is recessed inward of the top plate 11 from the intersection line between an imaginary plane extending from the upper surface 11a and an imaginary plane extending from the rear surface 11d. The cutout 115d is also recessed inward of the top plate 11 from the intersection line between an imaginary plane extending from the upper surface 11a and an imaginary plane extending from the side surface 11e.

[0043] In the catch 10A according to this embodiment, the notches 115c and 115d are provided in regions 117 and 118, respectively. Region 117 is the region of the top plate 11 on the cross beam 22 side when the catch 10A is connected to the cross beam 22 (FIG. 1). When the top plate 11 is divided into two regions along the center line A in the front-to-rear direction of the top plate 11 in a top view of the catch 10, region 117 is the region located on the cross beam 22 side. Region 118 is the region of the top plate 11 between the bolt hole 111a and the side plate 12.

[0044] The cutout portion 115d is formed in an area 117 of the top plate 11. A part of the cutout portion 115d may be disposed in the area 117 of the top plate 11, or the entire cutout portion 115d may be disposed in the area 117 of the top plate 11. The cutout portion 115d is adjacent to the side plate 12. However, the cutout portion 115d may also be adjacent to the side plate 13.

[0045] The cutout portion 115c is formed in the region 118 of the top plate 11. That is, the cutout portion 115c is disposed on the side plate 12 side with respect to the bolt hole 111a. The cutout portion 115c is adjacent to the side plate 12. However, the cutout portion 115c may be provided in the region of the top plate 11 between the bolt hole 111a and the other side plate 13. The cutout portion 115c may be adjacent to the side plate 13.

[0046] In this embodiment, the cutouts 115b, 115c, and 115d are provided in areas where the effect on the maximum stress generated in the catch 10A is relatively small. Therefore, as with the catch 10 of the first embodiment, even if the cutouts 115b, 115c, and 115d are provided in the top plate 11, the maximum stress generated in the catch 10A is unlikely to increase, and the strength reliability of the catch 10A can be maintained.

[0047] <Third embodiment> 6 and 7 are perspective views of the catch seat 10B according to this embodiment. FIG. 6 shows a perspective view of the catch seat 10B as seen from above. FIG. 7 shows a perspective view of the catch seat 10B as seen from below. Referring to FIGS. 6 and 7, the catch seat 10B according to this embodiment differs from the catch seats 10 and 10A of the first and second embodiments in the configuration of the top plate 11. Specifically, in this embodiment, the top plate 11 has a thin portion 115e instead of a notch portion.

[0048] In the top plate 11, the thickness of the thin portion 115e is smaller than the thickness of other portions of the top plate 11. The thickness of the top plate 11 is the dimension in the direction perpendicular to the outer surface of the top plate 11.

[0049] The thin portion 115e is provided, for example, on the top plate main body 112. In this embodiment, the thin portion 115e is provided in a region 116 of the top plate 11 on the opposite side from the cross beam 22 (FIG. 1) when the catch 10B is connected to the cross beam 22. The thin portion 115e is disposed in a position on the top plate 11 closer to one of the side plates 12.

[0050] The thin portion 115e may be provided on the top plate 11 so as to be adjacent to one of the side plates 12, 13. Alternatively, the thin portion 115e may be provided on one or both of the regions 117, 118 (FIG. 5) of the top plate 11. The thin portion 115e is preferably provided at a position on the top plate 11 where it does not substantially affect the maximum stress generated in the catch 10B. Whether the thin portion 115e is provided at a position on the top plate 11 where it does not substantially affect the maximum stress generated in the catch 10B can be determined by the same procedure as that described for the cutout portions 115a, 115b in the first embodiment.

[0051] In this embodiment, the position where the thin portion 115e is provided is substantially the same as the position where the notch portion 115a (FIGS. 2 and 3) of the catch 10 of the first embodiment is provided, and is an area where the effect on the maximum stress generated in the catch 10B is relatively small. The thin portion 115e is provided in an area 116 on the opposite side of the cross beam 22 of the top plate 11. Therefore, as with the catches 10 and 10A of the first and second embodiments, even if the thin portion 115e is provided in the top plate 11, the maximum stress generated in the catch 10B is unlikely to increase, and the strength reliability of the catch 10B can be maintained.

[0052] 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.

[0053] In the above embodiment, the table top 11 has a substantially U-shape when viewed in the front-to-rear direction. That is, the table top 11 includes a pair of vertical walls 113, 114 in addition to the table top main body 112. However, the table top 11 does not necessarily have to include the vertical walls 113, 114. In this case, the table top 11 has a flat shape overall.

[0054] In the above embodiment, the top plate 11 has a cutout or a thin portion. However, the top plate 11 may have a through-hole. The through-hole penetrates the top plate 11 in the plate thickness direction. The through-hole is preferably provided at a position on the top plate 11 where it does not substantially affect the maximum stress generated in the seat. Whether the through-hole is provided at a position on the top plate 11 where it does not substantially affect the maximum stress generated in the seat can be determined using the same procedure as described for the cutouts 115a and 115b in the first embodiment. The through-hole may be provided in the top plate 11 adjacent to one of the side plates 12 and 13. The through-hole may be provided in any of the regions 116, 117, and 118 of the top plate 11. For example, in the seat 10 of the first embodiment, a through-hole may be provided in the region 116 of the top plate 11 in addition to or instead of the cutouts 115a and 115b. Alternatively, in the receiving seat 10A of the second embodiment, through holes may be provided in the regions 117 and 118 of the top plate 11 in addition to or instead of the cutout portions 115c and 115d.

[0055] The top plate 11 may have at least one of a cutout, a thin portion, and a through hole. The top plate 11 may have only one of a cutout, a thin portion, and a through hole, or may have a mixture of two or more of a cutout, a thin portion, and a through hole. The number of cutouts, thin portions, or through holes provided in the top plate 11 is not particularly limited. A large number of relatively small through holes may be formed in the top plate 11 by, for example, punching. Alternatively, a large number of relatively small thin portions may be formed in the top plate 11 by, for example, dimple processing. [Example]

[0056] 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.

[0057] To confirm the effects of the present disclosure, stress analysis using the finite element method (FEM analysis) was performed. Specifically, an analytical model (Example 1) of the catch 10 (FIGS. 2 and 3) according to the first embodiment, an analytical model (Example 2) of the catch 10A (FIGS. 4 and 5) according to the second embodiment, and an analytical model (Example 3) of the catch 10B (FIGS. 6 and 7) according to the third embodiment were created and analyzed. In the analysis, the maximum stress generated at the joints (welds) between the top plate 11 and the side plates 12 and 13, where stress tends to concentrate, was confirmed for each catch 10, 10A, and 10B. 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).

[0058] For comparison, an analytical model (comparative example) was also created for the catch shown in Fig. 8, and analysis was performed in the same manner. The catch of the comparative example had no notch, thin-walled portion, or through-hole provided in the top plate 11. The analytical conditions and results are shown in Table 1.

[0059] [Table 1]

[0060] Referring to Table 1, the catches 10, 10A, and 10B of Examples 1 to 3 all had smaller masses than the catches of the comparative example because the top plate 11 had cutouts or thin portions. Specifically, the mass of the top plate 11 of Example 1 was 0.97 times the mass of the top plate 11 of the comparative example. The mass of the top plate 11 of Example 2 was 0.70 times the mass of the top plate 11 of the comparative example. The mass of the top plate 11 of Example 3 was 0.97 times the mass of the top plate 11 of the comparative example.

[0061] As a result of the analysis, the maximum stress generated in the catch seats 10 and 10B of Examples 1 and 3 was 1.00 times the maximum stress generated in the catch seat of the comparative example. Furthermore, the maximum stress generated in the catch seat 10A of Example 2 was 1.05 times the maximum stress generated in the catch seat of the comparative example. In other words, the maximum stress generated in the catch seats 10, 10A, and 10B of Examples 1 to 3, in which the top plate 11 has a notch or a thin-walled portion, was equivalent to the maximum stress generated in the catch seat of the comparative example, in which the top plate 11 does not have a notch, a thin-walled portion, or a through-hole. This demonstrates that the catch seats 10, 10A, and 10B of Examples 1 to 3 are lighter while maintaining the same strength reliability as the catch seat of the comparative example. [Explanation of symbols]

[0062] 10: catch seat 11: Top plate 111a: Bolt hole 115a, 115b, 115c, 115d: Notch part 115e: Thin wall part 116,117,118: Area 12, 13: Side panels 22: Horizontal

Claims

1. A seat connected to a cross beam of a railway vehicle for mounting a functional part, A pair of side plates facing each other; a top plate connected to each of the side plates to connect the side plates together, the top plate having bolt holes for fastening the functional components with bolts; The top plate is provided with a notch, a thin portion, or a through hole.

2. The seat according to claim 1, The notch, the thin-walled portion, or the through-hole is provided at a position on the top plate where it does not affect the maximum stress generated in the seat.

3. The seat according to claim 1, The notch portion, the thin-walled portion, or the through-hole is adjacent to one of the side plates.

4. The seat according to claim 1, The notch portion, the thin portion, or the through hole is provided in an area of ​​the top plate opposite the cross beam when the seat is connected to the cross beam.

5. The seat according to claim 1, When the seat is connected to the cross beam, the cutout portion, the thin-walled portion, or the through hole is provided in each of the areas of the top plate on the cross beam side and the areas of the top plate between the bolt hole and one of the side plates.

6. The seat according to any one of claims 1 to 5, The functional component is a brake caliper, a unit brake, a motor, or a gear device.

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