Bogie frame for railway car

Abstract

To provide a bogie frame for railway cars of which welding amount can be reduced and weight can be lighter.SOLUTION: A bogie frame (10) for a railway car includes a pair of side beam bodies (20), a cross beam body (30), and a bottom plate (40). Each of the pair of side beam bodies (20) includes a pair of first side plate parts (21) and a first top plate part (22). The first top plate part (22) is formed integrally with each of the first side plate parts (21). The cross beam body (30) includes a pair of second side plate parts (31) and a second top plate part (32). The cross beam body (30) is joined to each of the side beam bodies (20) by welding. The bottom plate (40) includes a first bottom plate part (41) and a second bottom plate part (42). The first bottom plate part (41) is joined to each of the first side plate parts (21) by welding. The second bottom plate part (42) is formed integrally with the first bottom plate part (41). The second bottom plate part (42) is joined to each of the second side plate parts (31) by welding.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to bogie frames for rail vehicles. [Background technology]

[0002] Generally, a bogie for a railway vehicle includes front and rear wheel sets and a bogie frame that supports each wheel set. The bogie frame includes a pair of side beams and a cross beam. The cross beam connects the side beams together.

[0003] The bogie further includes functional components such as brake calipers, motors, and gear devices to realize the functions of the bogie. The functional components are attached to, for example, a seat. The seat is usually joined to the cross beam by welding.

[0004] Patent Document 1 discloses a bogie frame in which the side beams and cross beams have a four-sided plate joint structure. The side beams and cross beams are each composed of a top plate member, a bottom plate member, and a pair of side plate members welded to the top plate member and the bottom plate member. The bottom plate members of the side beams are separate from the bottom plate members of the cross beams. The cross beams are provided with catch support portions that correspond to the upper and lower surfaces of the catches. These catch support portions are molded integrally with the top plate member and the bottom plate member, respectively. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5765292 Summary of the Invention [Problem to be solved by the invention]

[0006] In a bogie frame for a railway vehicle, the allowable stress of a weld is smaller than the allowable stress of the base material. Therefore, from the viewpoint of improving the reliability of the bogie frame, it is preferable to reduce the amount of welding in the bogie frame as much as possible and use the bogie frame as the base material.

[0007] Methods for producing a bogie frame from a base material include press working and forging. However, when manufactured by press working, the plate thickness of the bogie frame is basically constant. Furthermore, when manufactured by forging, it is difficult to form a portion of the bogie frame where the cross-sectional shape changes suddenly. Therefore, a bogie frame formed entirely by press working or forging may be heavier than a bogie frame formed by joining multiple plate materials by welding.

[0008] An object of the present disclosure is to provide a bogie frame for a railway vehicle that can be made lighter while reducing the amount of welding. [Means for solving the problem]

[0009] The bogie frame for a railway vehicle according to the present disclosure comprises a pair of side beam bodies, a cross beam body, and a bottom plate. Each of the pair of side beam bodies includes a pair of first side plate portions and a first top plate portion. The pair of first side plate portions face each other. The first top plate portion is formed integrally with each of the first side plate portions. The first top plate portion connects the first side plate portions to each other. The cross beam body includes a pair of second side plate portions and a second top plate portion. The pair of second side plate portions face each other. The second top plate portion connects the second side plate portions to each other. The cross beam bodies are joined to each of the side beam bodies by welding. The bottom plate includes a first bottom plate portion and a second bottom plate portion. The first bottom plate portion is joined to each of the first side plate portions on the side opposite the first top plate portion by welding. The second bottom plate portion is formed integrally with the first bottom plate portion. The second bottom plate portion is joined by welding to each of the second side plate portions on the opposite side to the second top plate portion. [Effects of the Invention]

[0010] According to the bogie frame for a railway vehicle according to the present disclosure, it is possible to reduce the amount of welding and also to achieve weight reduction. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a bogie frame according to the first embodiment. [Figure 2] FIG. 2 is a perspective view of the bogie frame according to the first embodiment. [Figure 3]FIG. 3 is a cross-sectional view of the side beam body and bottom plate. [Figure 4] FIG. 4 is a cross-sectional view of the cross beam body and the bottom plate. [Figure 5] FIG. 5 is a cross-sectional view of a cross beam body and a bottom plate of a bogie frame according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] The bogie frame for a railway vehicle according to this embodiment comprises a pair of side beam bodies, a cross beam body, and a bottom plate. Each of the pair of side beam bodies includes a pair of first side plate portions and a first top plate portion. The pair of first side plate portions face each other. The first top plate portion is formed integrally with each of the first side plate portions. The first top plate portion connects the first side plate portions to each other. The cross beam body includes a pair of second side plate portions and a second top plate portion. The pair of second side plate portions face each other. The second top plate portion connects the second side plate portions to each other. The cross beam bodies are joined to each of the side beam bodies by welding. The bottom plate includes a first bottom plate portion and a second bottom plate portion. The first bottom plate portion is joined to each of the first side plate portions on the side opposite the first top plate portion by welding. The second bottom plate portion is formed integrally with the first bottom plate portion. The second bottom plate portion is joined by welding to each of the second side plate portions on the side opposite to the second top plate portion (first configuration).

[0013] The side beams and cross beams of conventional bogie frames typically have a four-sided plate joint structure. Specifically, the side beams and cross beams each consist of a top plate member, a bottom plate member, and a pair of side plate members welded to the top plate member and the bottom plate member. The bottom plate members of the side beams are separate from the bottom plate members of the cross beams and are welded to the bottom plate members of the cross beams. Because welds are provided between the top plate member and the side plate members, the length of the top plate member is greater than the distance between the side plate members in a cross-sectional view of the side beams and cross beams.

[0014] In contrast, in the bogie frame according to the first configuration, the side beams and the cross beams share a common bottom plate. Specifically, the second bottom plate portions corresponding to the bottom plate members of the cross beams are provided integrally with the first bottom plate portions corresponding to the bottom plate members of the side beams. Therefore, the amount of welding can be reduced compared to when the bottom plate members of the side beams and the bottom plate members of the cross beams are joined by welding.

[0015] In the bogie frame according to the first configuration, the first top plate portion is further provided integrally with each of the first side plate portions in the side beam main body. Therefore, the amount of welding in the side beam main body can be reduced compared to when each of the side plate members and the top plate member are joined by welding. The reduced amount of welding results in a corresponding reduction in the weight of the bogie frame. Furthermore, because the first top plate portion is provided integrally with each of the first side plate portions, there is no need to provide a weld between the first top plate portion and the first side plate portion, and therefore the first top plate portion can be made relatively short. This allows for a reduction in the weight of the bogie frame.

[0016] In the first configuration, the cross beam body is joined to each of the side beam bodies by welding. In this case, the side beam body and the cross beam body can be formed separately. Therefore, for example, even if the cross beam body has a complex cross-sectional shape in the vicinity of the side beam body, the cross beam body can be easily formed. This allows for flexibility in the shape of the cross beam body. On the other hand, since the shape of the bottom plate is usually not complex, in the first configuration, the second bottom plate portion is formed integrally with each of the first bottom plate portions. Such bottom plates can be easily manufactured by press working, forging, or the like.

[0017] In the bogie frame of the first configuration, the second top plate portion may be joined to each of the second side plate portions by welding (second configuration).

[0018] In the bogie frame of the first configuration, the second top plate portion may be provided integrally with each of the second side plate portions (third configuration).

[0019] In the third configuration, the second top plate portion is formed integrally with each of the second side plate portions in the cross beam main body. Therefore, the amount of welding required in the cross beam main body can be reduced compared to when each of the side plate members and the top plate member are joined by welding. Furthermore, because the second top plate portion is formed integrally with each of the second side plate portions, there is no need to form a weld between the second top plate portion and the second side plate portion, and therefore the second top plate portion can be made relatively short. This contributes to reducing the weight of the bogie frame.

[0020] In the bogie frame according to any one of the first to third configurations, the bottom plate may further include a catch support portion. The catch support portion is provided integrally with the second bottom plate portion. The catch support portion protrudes from the second bottom plate portion. A catch for attaching a functional component is joined to the catch support portion by welding (fourth configuration).

[0021] In the bogie frame of the fourth configuration, the strike plate support portion is provided integrally with the second bottom plate portion of the cross beam. Even if the strike plate is welded to this strike plate support portion, no weld toe is generated between the strike plate and the cross beam. Therefore, with the fourth configuration, the amount of finishing work using a grinder or the like is reduced, thereby reducing the number of maintenance steps.

[0022] 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.

[0023] First Embodiment [Bogie frame configuration] 1 and 2 are perspective views of a bogie frame 10 according to this embodiment. The bogie frame 10 is used in a railway vehicle. FIG. 1 shows a perspective view of the bogie frame 10 as seen from above. FIG. 2 shows a perspective view of the bogie frame 10 as seen from below. For convenience of explanation, the up-down direction when the bogie frame 10 is mounted on a railway vehicle may be simply referred to as the up-down direction hereinafter. Similarly, the left-right direction (width direction) when the bogie frame 10 is mounted on a railway vehicle may be simply referred to as the left-right direction, and the front-rear direction (direction of travel) when the bogie frame 10 is mounted on a railway vehicle may be simply referred to as the front-rear direction.

[0024] 1, the bogie frame 10 includes a pair of side beam bodies 20, a cross beam body 30, and a bottom plate 40. The bogie frame 10 may further include a spring cap 50.

[0025] The pair of side sill bodies 20 are arranged at a distance from each other in the left-right direction of the bogie frame 10. Each of the side sill bodies 20 extends in the front-rear direction. A spring cap 50 is connected to the front and rear ends of each of the side sill bodies 20. In the example of FIG. 1, each of the spring caps 50 is a separate member from the side sill body 20. When the bogie frame 10 is mounted on a railway vehicle, an axle box (not shown) is attached to each of the spring caps 50. The axle box rotatably supports a wheel set (not shown).

[0026] Each side beam body 20 includes a pair of side plate portions 21 and a top plate portion 22. The side plate portions 21 face each other in the left-right direction of the bogie frame 10. The top plate portion 22 connects the side plate portions 21 to each other. The side plate portions 21 and the top plate portion 22 each extend in the front-rear direction of the bogie frame 10.

[0027] The cross beam body 30 extends in the left-right direction of the bogie frame 10. The cross beam body 30 is disposed between a pair of side beam bodies 20 in the left-right direction and connects the side beam bodies 20 together. The cross beam body 30 is a separate member from each of the side beam bodies 20. The cross beam body 30 is joined to each of the side beam bodies 20 by welding.

[0028] 1 and 2, the cross beam main body 30 includes a pair of side plate portions 31 and a top plate portion 32. The side plate portions 31 face each other in the front-rear direction of the bogie frame 10. The top plate portion 32 connects the side plate portions 31 to each other. The side plate portions 31 and the top plate portion 32 each extend in the left-right direction of the bogie frame 10.

[0029] Referring to Figure 2, the bottom plate 40 is a separate member from the side beam main body 20 and the cross beam main body 30. The bottom plate 40 includes a pair of bottom plate portions 41 and a bottom plate portion 42. Each of the bottom plate portions 41 corresponds to a side beam main body 20. Each of the bottom plate portions 41 corresponds to a bottom plate member of the side beam. The bottom plate portion 42 corresponds to the cross beam main body 30. The bottom plate portion 42 corresponds to a bottom plate member of the cross beam. The bottom plate portion 42 is disposed between the pair of bottom plate portions 41 in the left-right direction and connects the bottom plate portions 41 together.

[0030] The bottom plate portion 42 is provided integrally with each of the bottom plate portions 41. In other words, the bottom plate portion 42 is continuous with each of the bottom plate portions 41, and there is no joint, which is a welded portion, between the bottom plate portions 41 and 42.

[0031] 1 and 2, seats 11a, 11b, 12a, and 12b for mounting functional parts may be joined to the cross beams of the bogie frame 10. The functional parts are parts that realize the functions of the bogie. Examples of functional parts include a motor, a gear device, and a brake caliper. In this embodiment, the seats 11a and 11b are motor seats, and the seats 12a and 12b are gear device seats.

[0032] The catch 11a is joined to the cross beam from one side in the front-rear direction. The catch 11b is joined to the cross beam from the other side in the front-rear direction. In the left-right direction, the position of the catch 11a is different from the position of the catch 11b.

[0033] The catch 12a is joined to the cross beam from one side in the front-to-rear direction. The catch 12a is arranged next to the catch 11a in the left-to-right direction. The catch 12b is joined to the cross beam from the other side in the front-to-rear direction. The catch 12b is arranged next to the catch 11b in the left-to-right direction. In the left-to-right direction, the position of the catch 12a differs from the position of the catch 12b. The left-to-right position of the catch 12a may generally coincide with the left-to-right position of the catch 11b. Furthermore, the left-to-right position of the catch 12b may generally coincide with the left-to-right position of the catch 11a.

[0034] The cross beam body 30 may further include seat support portions 33a, 33b, 34a, and 34b. In this embodiment, the seat support portions 33a and 33b are motor seat support portions, and the seat support portions 34a and 34b are gear device seat support portions.

[0035] Each of the catch support portions 33a, 33b, 34a, and 34b protrudes in the front-to-rear direction from the top plate portion 32. The catch support portion 33a protrudes in the same direction as the catch support portion 34a. The catch support portions 33b and 34b protrude in the opposite direction to the catch support portions 33a and 34a.

[0036] Each of the catch support portions 33a, 33b, 34a, and 34b is provided integrally with the top plate portion 32. That is, each of the catch support portions 33a, 33b, 34a, and 34b is continuous with the top plate portion 32, and there are no joints, such as welded portions, between the catch support portions 33a, 33b, 34a, and 34b and the top plate portion 32.

[0037] The bottom plate 40 may further include seat support portions 43a, 43b, 44a, and 44b. In this embodiment, the seat support portions 43a and 43b are motor seat support portions, and the seat support portions 44a and 44b are gear device seat support portions.

[0038] Each of the catch support portions 43a, 43b, 44a, and 44b protrudes in the front-rear direction from the bottom plate portion 42. The catch support portion 43a protrudes in the same direction as the catch support portion 44a. The catch support portions 43b and 44b protrude in the opposite direction to the catch support portions 43a and 44a.

[0039] Each of the catch support portions 43a, 43b, 44a, and 44b is provided integrally with the bottom plate portion 42. That is, each of the catch support portions 43a, 43b, 44a, and 44b is continuous with the bottom plate portion 42, and there are no joints, such as welds, between the catch support portions 43a, 43b, 44a, and 44b and the bottom plate portion 42.

[0040] The bottom plate 40 can be manufactured by, for example, pressing a single metal plate. The bottom plate 40, in which the bottom plate portions 41 and 42 and the catch support portions 43a, 43b, 44a, and 44b are integrated, is formed by pressing the metal plate. Alternatively, the bottom plate 40 can be manufactured by forging.

[0041] 1 and 2, the striker 11a is joined by welding to the striker support portion 33a of the cross beam main body 30, the striker support portion 43a of the bottom plate 40, and one of the side plate portions 31. The striker 11b is joined by welding to the striker support portion 33b of the cross beam main body 30, the striker support portion 43b of the bottom plate 40, and the other side plate portion 31. The striker 12a is joined by welding to the striker support portion 34a of the cross beam main body 30, the striker support portion 44a of the bottom plate 40, and one of the side plate portions 31. The striker 12b is joined by welding to the striker support portion 34b of the cross beam main body 30, the striker support portion 44b of the bottom plate 40, and the other side plate portion 31.

[0042] Fig. 3 is a cross-sectional view (cross-sectional view taken along III-III in Fig. 1) of the side beam body 20 and the bottom plate 40. Referring to Fig. 3, the side beam body 20 is disposed on the bottom plate portion 41 of the bottom plate 40. The cross-sectional shape of the side beam body 20 is substantially U-shaped.

[0043] In the side beam main body 20, both side portions of the top plate portion 22 are connected to the side plate portions 21. The top plate portion 22 includes a top plate main body 221 and two corner portions 222. In a cross-sectional view of the side beam main body 20, the top plate main body 221 is flat and extends in the left-right direction. The corner portions 222 are provided continuously on both left-right sides of the top plate main body 221. The cross-sectional shape of the corner portions 222 is, for example, arc-shaped. Each of the side plate portions 21 is connected to the top plate main body 221 via the corner portions 222. Each of the side plate portions 21 is continuous with the corner portions 222 and extends downward from the corner portions 222 in a cross-sectional view of the side beam main body 20. The left-right dimension of the top plate portion 22 is, for example, equal to the left-right distance between the side plate portions 21. In this case, the positions of the left and right ends of the top plate portion 22 coincide with the positions of the upper ends of the side plate portions 21, respectively. The left and right ends of the top plate portion 22 are the ends of the rounded corners 222 on the side plate portion 21 side.

[0044] The top plate portion 22 is formed integrally with each of the side plate portions 21. In other words, the top plate portion 22 is continuous with each of the side plate portions 21, and there are no joints, such as welds, between the top plate portion 22 and the side plate portions 21. Such a side beam body 20 can be manufactured, for example, by pressing a single metal plate. The side beam body 20, in which the side plate portions 21 and the top plate portion 22 are integrated, is formed by pressing the metal plate. The thickness t1 of the side beam body 20 is typically constant.

[0045] Of the bottom plate 40, the bottom plate portion 41 is disposed below the side beam main body 20. The bottom plate portion 41 is flat in a cross-sectional view and extends in the left-right direction. The bottom plate portion 41 is disposed opposite the top plate portion 22 in the up-down direction and connects the side plate portions 21 to each other. The bottom plate portion 41 is joined to each of the side plate portions 21 by welding on the side opposite the top plate portion 22. Specifically, the upper surface of the bottom plate portion 41 is joined to the lower end of each side plate portion 21. As a result, the bottom plate portion 41 forms a closed cross section together with the side beam main body 20. In the left-right direction, both side portions of the bottom plate portion 41 protrude outward from the side plate portions 21. The dimension of the bottom plate portion 41 in the left-right direction is greater than the distance between the side plate portions 21 in the left-right direction.

[0046] The thickness t2 of the bottom plate portion 41 may be the same as or different from the thickness t1 of the side beam main body 20. In the example of this embodiment, the thickness t2 of the bottom plate portion 41 is greater than the thickness t1 of the side beam main body 20.

[0047] A plurality of ribs (not shown) may be provided inside the side beam main body 20 and the bottom plate portion 41. The ribs are arranged in the front-to-rear direction inside the side beam main body 20 and the bottom plate portion 41. The ribs may be joined to the inner surface of the side beam main body 20 and / or the bottom plate portion 41 by welding.

[0048] 4 is a cross-sectional view (IV-IV cross-sectional view in FIG. 1) of the cross beam body 30 and the bottom plate 40. Referring to FIG. 4, the cross beam body 30 is disposed on the bottom plate portion 42 of the bottom plate 40.

[0049] In a cross-sectional view of the cross beam main body 30, the top plate portion 32 is flat and extends in the front-to-rear direction. The top plate portion 32 is joined to each of the side plate portions 31 by welding. Specifically, the lower surface of the top plate portion 32 is joined to the upper end of each side plate portion 31. In a cross-sectional view of the cross beam main body 30, each of the side plate portions 31 is flat and extends in the up-down direction. In the front-to-rear direction, both side portions of the top plate portion 32 protrude outward from the side plate portions 31. The dimension of the top plate portion 32 in the front-to-rear direction is greater than the distance between the side plate portions 31 in the front-to-rear direction.

[0050] The bottom plate portion 42 is disposed below the cross beam main body 30. The bottom plate portion 42 is flat in cross section and extends in the front-to-rear direction. The bottom plate portion 42 is disposed opposite the top plate portion 32 in the up-down direction and connects the side plate portions 31 to each other. The bottom plate portion 42 is joined to each of the side plate portions 31 by welding on the side opposite the top plate portion 32. Specifically, the upper surface of the bottom plate portion 42 is joined to the lower end of each side plate portion 31. As a result, the bottom plate portion 42 and the cross beam main body 30 form a closed cross section. In the front-to-rear direction, both side portions of the bottom plate portion 42 protrude outward from the side plate portions 31. The dimension of the bottom plate portion 42 in the front-to-rear direction is greater than the distance between the side plate portions 31 in the front-to-rear direction. The thicknesses of the pair of side plate portions 31, the top plate portion 32, and the bottom plate portion 42 may be the same or different.

[0051] The cross beam main body 30 and the bottom plate portion 42 support functional components via the respective seat support portions, and therefore receive loads from the functional components. From the viewpoint of improving the load-bearing capacity of the cross beam main body 30 and the bottom plate portion 42, it is preferable that a plurality of ribs (not shown) be provided inside the cross beam main body 30 and the bottom plate portion 42. The ribs are arranged in the left-right direction inside the cross beam main body 30 and the bottom plate portion 42. The ribs may be joined to the inner surface of the cross beam main body 30 and / or the bottom plate portion 42 by welding.

[0052] [effect] In the bogie frame 10 according to this embodiment, the bottom plate 40 is common to the side beams and the cross beams. Specifically, the bottom plate portions 42 corresponding to the bottom plate members of the cross beams are provided integrally with the bottom plate portions 41 corresponding to the bottom plate members of the side beams. Therefore, the amount of welding can be reduced compared to when the bottom plate portions 41 and 42 are joined by welding.

[0053] Generally, when the side beams and cross beams of a bogie frame are joined by welding, stress tends to concentrate at the welded portions. In the bogie frame 10 according to this embodiment, the bottom plate portion 42 is provided integrally with each of the bottom plate portions 41, and therefore the allowable stress is higher than when the bottom plate portions 41 and 42 are joined by welding. Therefore, according to the bogie frame 10 according to this embodiment, the strength of the bottom plate 40 can be increased, and the reliability of the entire bogie frame 10 can be improved.

[0054] In the bogie frame 10 according to this embodiment, the top plate portion 22 is further provided integrally with each of the side plate portions 21 in the side beam main body 20. Therefore, the amount of welding in the side beam main body 20 can be reduced compared to when each of the side plate portions 21 and the top plate portion 22 are joined by welding. When the amount of welding is reduced, the weight of the bogie frame 10 is reduced accordingly. Furthermore, in the bogie frame 10 according to this embodiment, the top plate portion 22 is provided integrally with each of the side plate portions 21, so the dimension of the top plate portion 22 in the left-right direction is equal to the distance between the side plate portions 21 in the left-right direction. In this way, according to the bogie frame 10 according to this embodiment, the top plate portion 22 can be made relatively short, and therefore the weight of the bogie frame 10 can be reduced.

[0055] In the bogie frame 10 according to this embodiment, the cross beam main body 30 is joined to each of the side beam main bodies 20 by welding. In this case, the side beam main body 20 and the cross beam main body 30 can be formed separately. Therefore, even if the cross beam main body 20 has a complex cross-sectional shape in the vicinity of the side beam main body 30, for example, the cross beam main body 30 can be easily formed. This allows for a degree of freedom in the shape of the cross beam main body 30. On the other hand, since the shape of the bottom plate 40 is usually not complex, in the bogie frame 10, the bottom plate portion 42 is formed integrally with each of the bottom plate portions 41. Such a bottom plate 40 can be easily manufactured by press working, forging, or the like.

[0056] When a railway vehicle is running, tensile stress is usually likely to occur in the lower part of the bogie frame. Therefore, in the side beams of the bogie frame 10 according to this embodiment, the thickness t2 of the bottom plate portion 41 is greater than the thickness t1 of the side beam main body 20. In this case, the thickness t1 of the side beam main body 20, which contributes relatively little to the strength of the bogie frame 10, can be reduced. This allows the weight of the bogie frame 10 to be further reduced while ensuring the strength of the side beams.

[0057] In this embodiment, the cross beam has a four-sided plate joint structure. In the cross beam main body 30, the top plate portion 32 is joined by welding to each of the side plate portions 31. Because the top plate portion 32 is separate from each of the side plate portions 31, it is possible to provide the top plate portion 32 with catch support portions 33a, 33b, 34a, and 34b.

[0058] In the bogie frame 10 according to this embodiment, each catch support portion is provided integrally with the cross beam. Specifically, the catch support portions 43a, 43b, 44a, and 44b are provided integrally with the bottom plate portion 42. Furthermore, the catch support portions 33a, 33b, 34a, and 34b are provided integrally with the top plate portion 32. In this case, even if the corresponding catches are welded to the catch support portions, no weld toes are generated between the catches and the cross beams. Therefore, with the bogie frame 10 according to this embodiment, the amount of finishing work using a grinder or the like is reduced, and therefore the number of maintenance man-hours can be reduced.

[0059] Second Embodiment Fig. 5 is a cross-sectional view of the cross beam main body 30 and the bottom plate 40 of the bogie frame according to the second embodiment. Referring to Fig. 5, the cross-sectional shape of the cross beam main body 30 of the bogie frame according to this embodiment differs from the cross-sectional shape of the cross beam main body 30 of the bogie frame 10 according to the first embodiment. Referring to Fig. 5, the cross-sectional shape of the cross beam main body 30 is approximately U-shaped.

[0060] In the cross beam main body 30, both sides of the top plate portion 32 are connected to the side plate portions 31. The top plate portion 32 includes a top plate main body 321 and two corner portions 322. In a cross-sectional view of the cross beam main body 30, the top plate main body 321 is flat and extends in the front-to-rear direction. The corner portions 322 are provided continuously on both front-to-rear sides of the top plate main body 321. The cross-sectional shape of the corner portions 322 is, for example, arc-shaped. Each of the side plate portions 31 is connected to the top plate main body 321 via the corner portions 322. Each of the side plate portions 31 is continuous with the corner portions 322 and extends downward from the corner portions 322 in a cross-sectional view of the cross beam main body 30. The dimension of the top plate portion 32 in the front-to-rear direction is, for example, equal to the distance between the side plate portions 31 in the front-to-rear direction. In this case, the positions of the front and rear ends of the top plate portion 32 coincide with the positions of the upper ends of the side plate portions 31, respectively. The front and rear ends of the top plate portion 32 are the ends of the rounded corners 322 on the side plate portion 31 side.

[0061] The top plate portion 32 is formed integrally with each of the side plate portions 31. In other words, the top plate portion 32 is continuous with each of the side plate portions 31, and there are no joints, such as welds, between the top plate portion 32 and the side plate portions 31. Such a cross beam main body 30 can be manufactured, for example, by pressing a single metal plate. The cross beam main body 30, in which the side plate portions 31 and the top plate portion 32 are integrated, is formed by pressing the metal plate. The thickness of the cross beam main body 30 is typically constant. Note that in this embodiment, since the top plate portion 32 is integral with each of the side plate portions 31, the top plate portion 32 does not have the catch support portions 33a, 33b, 34a, 34b (FIG. 1).

[0062] In this embodiment, the top plate portion 32 is provided integrally with each of the side plate portions 31 in the cross beam main body 30. Therefore, the amount of welding in the cross beam main body 30 can be reduced compared to when each of the side plate portions 31 and the top plate portion 32 are joined by welding. Furthermore, because the top plate portion 32 is provided integrally with each of the side plate portions 31, the length of the top plate portion 32 is equal to the distance between the side plate portions 31. In this way, with the bogie frame according to this embodiment, the top plate portion 32 can be made relatively short, which allows for a reduction in the weight of the bogie frame.

[0063] 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.

[0064] In the above embodiment, four seats 11a, 11b, 12a, and 12b are joined to the cross beam, but any number of seats may be joined to the cross beam. [Explanation of symbols]

[0065] 10: Bogie frame 11a, 11b: Receptacle (motor seat) 12a, 12b: Seat (seat for gear device) 20: Side beam body 21: Side plate part (first side plate part) 22: Top plate section (first top plate section) 30: Horizontal beam body 31: Side plate part (second side plate part) 32: Top plate (second top plate) 33a, 33b: Receptacle support portion (motor receptacle support portion) 34a, 34b: Receptacle support portion (receptacle support portion for gear device) 40: Bottom plate 41: Bottom plate part (first bottom plate part) 42: Bottom plate part (second bottom plate part) 43a, 43b: Receptacle support portion (motor receptacle support portion) 44a, 44b: Receptacle support portion (receptacle support portion for gear device)

Claims

1. A bogie frame for a railway vehicle, comprising: a pair of side beam bodies each including a pair of first side plate portions facing each other and a first top plate portion integrally formed with each of the first side plate portions and connecting the first side plate portions; a cross beam body including a pair of second side plate portions facing each other and a second top plate portion connecting the second side plate portions, the cross beam body being joined to each of the side beam bodies by welding; a bottom plate including: a first bottom plate portion joined by welding to each of the first side plate portions on the opposite side from the first top plate portion; and a second bottom plate portion formed integrally with the first bottom plate portion and joined by welding to each of the second side plate portions on the opposite side from the second top plate portion.

2. 2. The bogie frame according to claim 1, the second top plate portion is joined to each of the second side plate portions by welding.

3. 2. The bogie frame according to claim 1, The second top plate portion is provided integrally with each of the second side plate portions.

4. A bogie frame according to any one of claims 1 to 3, the bottom plate further includes a seat support portion that is integral with the second bottom plate portion and protrudes from the second bottom plate portion, A seat for mounting a functional component is joined to the seat support portion by welding.

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