Bogie for railway vehicle

Abstract

To provide a bogie for a railway vehicle capable of inspecting and repairing a welded portion of a volume adjusting member for adjusting a volume of an auxiliary air chamber of a side beam in maintenance and inspection.SOLUTION: In a bogie for a railway vehicle 1 including a side beam 111 formed along a rail direction and a cross beam 112 intersecting the side beam 111 and formed along a crosstie direction, the side beam 111 including therein an auxiliary-air-chamber 111b communicating with an air chamber 132 of an air spring 13, the side beam 111 includes a pipe 111e penetrating the side beam 111 and adjusting a volume of the auxiliary-air-chamber 111b, and the pipe 111e is welded to an outer surface 111fb of a side portion 111f of the side beam 111.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a railway vehicle bogie that is provided with an auxiliary air chamber inside a side beam of a railway vehicle bogie frame, the auxiliary air chamber communicating with an air chamber of an air spring. [Background technology]

[0002] Patent document 1 discloses a railway vehicle bogie in which the volume of an auxiliary air chamber inside a cross beam of a railway vehicle bogie frame is adjusted by adjusting the outer diameter of a cylindrical member in the auxiliary air chamber, thereby adjusting the proportion of the volume occupied by the cylindrical member in the auxiliary air chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-50066 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 discloses that the tubular member is welded to the lid, but does not specifically disclose how the tubular member and the lid are welded. If the tubular member is welded to the inner surface of the lid, the welded portion of the tubular member (i.e., the portion where the tubular member is welded to the lid) cannot be seen from the outside of the railcar bogie. Therefore, during maintenance and inspection of the railcar bogie, it is not possible to inspect or repair the welded portion of the tubular member, i.e., the volume adjustment member that adjusts the volume of the auxiliary air chamber.

[0005] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a bogie for a railway vehicle that allows inspection and repair of the welds of the volume adjustment member that adjusts the volume of the auxiliary air chamber of the side beam during maintenance and inspection, etc. [Means for solving the problem]

[0006] In order to achieve the above object, the railway vehicle of the present disclosure has the following configuration. (1) A bogie for a railway vehicle having side beams formed along the rail direction and cross beams intersecting the side beams and formed along the sleeper direction, the side beams having auxiliary air chambers therein that communicate with the air chambers of the air springs, characterized in that the side beams have volume adjustment members that penetrate the side beams and adjust the volume of the auxiliary air chambers, and the volume adjustment members are welded to the outer surfaces of the side beams.

[0007] In the present disclosure, the volume adjustment member penetrates the side sill and is welded to the outer surface of the side sill, so the welded portion of the volume adjustment member (i.e., the portion where the volume adjustment member is welded to the side sill) can be seen from the outside. This makes it possible to inspect and repair the welded portion of the volume adjustment member during maintenance and inspection of the railcar bogie, etc. This ensures the safety of the railcar bogie.

[0008] (2) In the bogie for a railway vehicle of (1), it is preferable that the welded portion of the volume adjustment member is formed so as to protrude outward beyond the outer surface of the side beam.

[0009] In the present disclosure, the welded portion of the volume adjustment member can be more reliably confirmed from the outside, which makes it easier to inspect and repair the welded portion of the volume adjustment member.

[0010] (3) In the bogie for a railway vehicle according to (1) or (2), it is preferable that the volume adjustment member penetrates the side beam in the direction of the sleepers.

[0011] In the present disclosure, even if air springs are provided above the side beams, the view is not obstructed by the air springs, and the welds of the volume adjustment members can be reliably seen from both sides of the side beams in the direction of the sleepers.

[0012] (4) In the bogie for a railway vehicle according to (1) or (2), it is preferable that the volume adjustment member is formed in a cylindrical shape.

[0013] In the present disclosure, the pressure in the auxiliary air chamber acts evenly on the volume adjustment member in the circumferential direction of the volume adjustment member, thereby preventing stress concentration in the volume adjustment member due to the pressure in the auxiliary air chamber.

[0014] (5) In the bogie for a railway vehicle of (4), it is preferable that, when viewed from the direction of the sleepers, the central axis of the volume adjustment member is located on the vertical center line of the side portion of the side beam.

[0015] In the present disclosure, the volume adjusting member is provided at a position where it is unlikely to affect the strength of the side beam, thereby ensuring the strength of the side beam. [Effects of the Invention]

[0016] According to the railway vehicle bogie of the present disclosure, inspection and repair of the welded portion of the volume adjustment member that adjusts the volume of the auxiliary air chamber of the side beam can be carried out during maintenance and inspection. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a top view of the bogie for a railway vehicle according to the present embodiment. [Figure 2] FIG. 2 is a front view of the bogie for a railway vehicle according to the present embodiment. [Figure 3] FIG. 3 is an enlarged view of a part of the side beam (only the side beam within the region α in FIG. 2) in this embodiment. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Figure 5] FIG. 10 is a front view of a modified railcar bogie. [Figure 6] FIG. 4 is a view corresponding to FIG. 3 in a modified example. [Figure 7] FIG. 4 is a diagram of the prior art corresponding to FIG. 3. [Figure 8] 8 is a cross-sectional view of FIG. 7 taken along line B-B. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a railway vehicle bogie according to the present disclosure will be described.

[0019] [Overall structure of railway vehicle bogies] As shown in FIGS. 1 and 2, a railway vehicle bogie 1 of this embodiment has a railway vehicle bogie frame 11 (hereinafter simply referred to as “bogie frame 11 ”), wheel sets 12 and air springs 13 .

[0020] The bogie frame 11 includes side beams 111, cross beams 112, and air spring supports 113.

[0021] The side beams 111 are formed along the rail direction (i.e., the X direction in FIG. 1). The side beams 111 are provided therein with spring cap portions 111a provided at both ends in the longitudinal direction (i.e., the rail direction, the X direction in FIG. 1), and an auxiliary air chamber 111b provided between the spring cap portions 111a at both ends. This auxiliary air chamber 111b communicates with the air chamber 132 of the air spring 13 that supports the vehicle body (not shown). A partition plate 111c is provided between the spring cap portions 111a and the auxiliary air chamber 111b to make the auxiliary air chamber 111b an airtight space.

[0022] In this embodiment, the side beam 111 has an inner hole for a cylindrical pipe 111e, which is a hole that penetrates the auxiliary air chamber 111b of the side beam 111 in the sleeper direction (Y direction), in addition to the through hole 111d for passing the joint 112a of the cross beam 112. By adjusting the number and outer diameter of the pipes 111e, the proportion of the volume occupied by the pipes 111e in the auxiliary air chamber 111b is adjusted so that the volume of the auxiliary air chamber 111b becomes a predetermined ratio to the volume of the air chamber 132 of the air spring 13. The pipe 111e is an example of a "volume adjusting member" in the present disclosure.

[0023] The cross beam 112 intersects with the side beams 111 and is formed along the sleeper direction (i.e., the Y direction in FIG. 1). Unlike conventional cross beams 112 that use two tubular members, the cross beam 112 of this embodiment is composed of a member in which upper and lower parts are joined together. The cross beam 112 has a larger dimension in the width direction, i.e., the rail direction of the bogie frame 11, than its thickness, and its cross section viewed in the longitudinal direction (i.e., the Y direction in FIG. 1) has a flat shape.

[0024] The cross beam 112 is composed of joint portions 112a that pass through the through holes 111d of the side beams 111 and join to the left and right side beams 111, and an intermediate portion 112b that has an oval through hole 112c. The joint portions 112a are provided on both sides in the sleeper direction (Y direction), and have an oval cross section with a predetermined width. The intermediate portion 112b is wider than the joint portions 112a and is formed so as to protrude in the rail direction as shown in FIG. 1.

[0025] As shown in Figures 1 and 2, the wheel set 12 includes a wheel 121, an axle 122, and an axle box suspension 123. The wheel 121 is attached to the axle 122, which is supported by the axle box suspension 123. The axle box suspension 123 supports the load while maintaining the appropriate position of the wheel set 12 relative to the bogie frame 11.

[0026] Air chamber 132 (see FIG. 2) of air spring 13 communicates with auxiliary air chamber 111b of side beam 111. By sealing air in air chamber 132 and auxiliary air chamber 111b, the spring characteristics of air spring 13 can be appropriately adjusted to absorb vibrations acting on the car body while the railway vehicle is running, improving ride comfort.

[0027] [Regarding the part that adjusts the volume of the auxiliary air chamber] The volume required for the auxiliary air chamber 111b of the side sill 111 differs depending on the type of railway vehicle. Therefore, in the prior art, as shown in Figures 7 and 8, partition plates 201 are welded to the inner surfaces 111fa of the side portions 111f on both sides of the side sill 111 in the sleeper direction (Y direction) to adjust the proportion of the volume occupied by the portion of the auxiliary air chamber 111b partitioned by the partition plates 201, thereby adjusting the volume of the auxiliary air chamber 111b.

[0028] However, the welded portion 202 of the partition plate 201 (i.e., the portion where the partition plate 201 is welded to the side sill 111) is provided on the inner surface 111fa of the side surface portion 111f of the side sill 111, and is hidden after the bogie frame 11 is assembled. Therefore, inspection and repair of the welded portion 202 cannot be performed after the bogie frame 11 is assembled, and must be performed before the bogie frame 11 is assembled. In this way, after the bogie frame 11 is assembled, inspection and repair of the welded portion 202 cannot be performed, for example, during maintenance and inspection of the railway vehicle bogie 1.

[0029] Therefore, in this embodiment, during maintenance and inspection of the railway vehicle bogie 1, inspection and repair of the welded joints of the volume adjustment member that adjusts the volume of the auxiliary air chamber 111b can be carried out, thereby ensuring the safety of the railway vehicle bogie 1.

[0030] 2 to 4, in this embodiment, a pipe 111e is provided as a volume adjusting member for adjusting the volume of the auxiliary air chamber 111b in the side beam 111. The pipe 111e is formed in a cylindrical shape and penetrates the side beam 111 in the sleeper direction (Y direction), that is, penetrates the side surface portions 111f on both sides of the side beam 111 in the sleeper direction, and is welded (for example, groove welded or fillet welded) from the outside to the outer surfaces 111fb of the side surface portions 111f.

[0031] In this embodiment, the volume of the auxiliary air chamber 111b is adjusted by adjusting the number and outer diameter of the pipes 111e, thereby adjusting the proportion of the volume occupied by the pipes 111e in the auxiliary air chamber 111b. For example, multiple pipes 111e with the same outer diameter are provided per side beam 111 according to the volume required for the auxiliary air chamber 111b. Here, as an example, two pipes 111e are provided per side beam 111, one at each side beam 111, and one is provided at a symmetrical position across the cross beam 112. Note that the proportion of the volume occupied by the pipes 111e in the auxiliary air chamber 111b is, for example, 1 / 3 to 1 / 4.

[0032] In this manner, in this embodiment, as shown in FIG. 4, the welded portion 111g of the pipe 111e (i.e., the portion where the pipe 111e is welded to the side surface portion 111f) is provided on the outer surface 111fb of the side sill 111, and can be seen from outside the railway vehicle bogie 1. This allows inspection and repair of the welded portion 111g during maintenance and inspection of the railway vehicle bogie 1, etc. This ensures the safety of the railway vehicle bogie 1. Note that the inspection of the welded portion 111g is, for example, an inspection to check for the presence or absence of cracks, and magnetic particle testing (MT) or the like is performed.

[0033] Furthermore, because the pipe 111e is cylindrical, the pressure in the auxiliary air chamber 111b acts on the pipe 111e evenly in the circumferential direction of the pipe 111e, thereby preventing stress concentration in the pipe 111e due to the pressure in the auxiliary air chamber 111b.

[0034] In addition, the pipe 111e is welded from the outside to the outer surface 111fb of the side portion 111f of the side beam 111, so that, as shown in Figures 1 and 4, the welded portion 111g is formed to protrude outward beyond the outer surface 111fb of the side portion 111f of the side beam 111.

[0035] This allows the welded portion 111g to be more reliably confirmed from outside the railway vehicle bogie 1. This makes it easier to inspect and repair the welded portion 111g during maintenance and inspection of the railway vehicle bogie 1, thereby reducing the workload and time required for inspecting and repairing the welded portion 111g.

[0036] As shown in FIG. 3, the central axis CA of the pipe 111e is located on the center line CL of the side surface portion 111f of the side beam 111 in the up-down direction (Z direction) when viewed from the sleeper direction (Y direction).

[0037] In this way, the pipe 111e is provided at a position where it is unlikely to affect the strength of the side beam 111, so that the strength of the side beam 111 can be ensured.

[0038] It should be noted that the above-described embodiments are merely examples and do not limit the present disclosure in any way. It goes without saying that various improvements and modifications are possible within the scope of the gist of the present disclosure.

[0039] For example, there is no particular limitation on the number of pipes 111e provided per side beam 111. Therefore, as shown in Figures 5 and 6, four pipes 111e may be provided per side beam 111. In the example shown in Figures 5 and 6, two pipes 111e are provided at positions symmetrical on both sides of the cross beam 112.

[0040] The pipe 111e may also have a polygonal cylindrical shape. [Explanation of symbols]

[0041] 1. Railway vehicle bogies 11 Bogie frames for railway vehicles (bogie frames) 111 Side beam 111b Auxiliary air chamber 111d Through hole 111e Pipe 111f Side part 111fa inside 111fb Exterior 111g welded section 112 Crossbeam 113 Air spring support 12 wheelset 13 Air spring 132 Air Chamber CL center line

Claims

1. a side beam formed along the rail direction; a cross beam that intersects with the side beam and is formed along the sleeper direction, The side beams are provided with auxiliary air chambers therein that communicate with the air chambers of the air springs. In railroad vehicle bogies, the side beam includes a volume adjustment member that penetrates the side beam and adjusts the volume of the auxiliary air chamber; the volume adjustment member is welded to the outer surface of the side beam; A bogie for a railway vehicle characterized by:

2. The railcar bogie of claim 1, the welded portion of the volume adjustment member is formed to protrude outward from the outer surface of the side beam; A bogie for a railway vehicle characterized by:

3. The bogie for a railway vehicle according to claim 1 or 2, the volume adjustment member penetrates the side beam in the direction of the sleepers; A bogie for a railway vehicle characterized by:

4. The bogie for a railway vehicle according to claim 1 or 2, the volume adjustment member is formed in a cylindrical shape; A bogie for a railway vehicle characterized by:

5. The bogie for a railway vehicle according to claim 4, When viewed from the sleeper direction, the central axis of the volume adjustment member is located on the vertical center line of the side surface portion of the side beam. A bogie for a railway vehicle characterized by:

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