Bogie for railway vehicle

Abstract

To provide a bogie for a railway vehicle capable of avoiding interference between an air guide portion provided below an air spring and a cross beam crossing a side beam in an auxiliary air chamber when the air spring is provided immediately above the side beam having the auxiliary air chamber inside.SOLUTION: In a bogie for a railway vehicle 1, an air spring 13 is provided at a position immediately above a side beam 111, a cross beam 112 includes, at a portion intersecting the side beam 111 in an auxiliary-air-chamber 111b, a passing-through flow path portion 112d that passes through the cross beam 112 and allows an air spring guide 113b and the auxiliary-air-chamber 111b to communicate with each other, and an inside diameter ID of the passing-through flow path portion 112d is larger than an outside diameter OD of the air spring guide 113b.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a bogie for a railway vehicle in which air springs that support a car body are provided at positions directly above side beams of a bogie frame. [Background technology]

[0002] Patent Document 1 discloses a bogie for a railway vehicle that has a bogie frame equipped with a pair of side beams extending in the longitudinal direction of the vehicle on both sides in the vehicle width direction, and a cross beam that connects the pair of side beams to each other and extends in the vehicle width direction, and that supports the car body via air springs mounted on this bogie frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-135039 Summary of the Invention [Problem to be solved by the invention]

[0004] In a railway vehicle bogie, in order to ensure a constant amount of air in the air springs that support the carbody, it is possible to connect the air chamber of the air spring to an auxiliary air chamber provided inside the side beam of the bogie frame via an air guide portion (for example, a boss or air spring guide) provided below the air spring.In this case, if the air spring is provided directly above the side beam, there is a risk of interference between the air guide portion provided below the air spring and the cross beam that intersects with the side beam within the auxiliary air chamber.

[0005] Here, in the railway vehicle bogie of Patent Document 1, the auxiliary air chamber is provided in the cross beam, but not in the side beam, so the above-mentioned risk is unlikely to occur.

[0006] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a bogie for a railway vehicle that, when an air spring is provided directly above a side beam that has an auxiliary air chamber inside, can avoid interference between the air guide section provided below the air spring and the cross beam that intersects with the side beam within the auxiliary air chamber. [Means for solving the problem]

[0007] 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, cross beams intersecting the side beams and formed along the sleeper direction, and an air guide section provided below an air spring, wherein the side beams have an auxiliary air chamber therein that communicates with the air chamber of the air spring, the bogie is characterized in that the air spring is provided directly above the side beams, and the cross beams have, at the part where they intersect with the side beams within the auxiliary air chamber, a through flow passage section that passes through the cross beams in the vertical direction and communicates the air guide section with the auxiliary air chamber, and the inner diameter of the through flow passage section is larger than the outer diameter of the air guide section.

[0008] In the present disclosure, when an air spring is provided directly above a side beam having an auxiliary air chamber therein, the inner diameter of the through-flow passage of the cross beam located within the auxiliary air chamber is larger than the outer diameter of the air guide, thereby preventing interference between the air guide and the cross beam.

[0009] Furthermore, because the through-flow passage penetrates the cross beam in the vertical direction, air can easily flow between the air guide and the auxiliary air chamber via the through-flow passage, which in turn facilitates air flow between the air spring and the auxiliary air chamber via the air guide and the through-flow passage.

[0010] (2) In the bogie for a railway vehicle of (1), it is preferable that the air guide portion is inserted into the through-flow passage portion or is located close to the through-flow passage portion.

[0011] In the present disclosure, by inserting the air guide section into the through-flow passage section or by locating the air guide section close to the through-flow passage section, the height at which the air guide section is disposed can be lowered, and therefore the height at which the air spring is disposed can be lowered, thereby preventing the size of the railway vehicle bogie from increasing.

[0012] (3) In the bogie for a railway vehicle of (1) or (2), it is preferable that the air guide portion and the through-flow passage portion are not joined together but are formed separately.

[0013] In the present disclosure, even if the positional relationship between the air springs and the side beams and cross beams varies depending on the type of railway vehicle in which the railway vehicle bogie is used, the positional relationship between the air springs and the side beams and cross beams can be adjusted by adjusting the positional relationship between the air guide portion and the through-flow passage portion.As a result, it is not necessary to change the air flow path structure between the air springs and the auxiliary air chamber depending on the type of railway vehicle.This makes it possible to make the railway vehicle bogie versatile for use with various types of railway vehicles.

[0014] (4) In the bogie for a railway vehicle according to (1) or (2), it is preferable that the through-flow passage portion is formed in a straight pipe shape.

[0015] In the present disclosure, a through-flow passage portion with a simple structure can ensure an air flow path between the air spring and the auxiliary air chamber. Furthermore, resistance to the air flow within the through-flow passage portion is reduced, making it easier for the air to flow, and therefore, the air can easily flow between the air spring and the auxiliary air chamber via the through-flow passage portion. [Effects of the Invention]

[0016] According to the railway vehicle bogie disclosed herein, when an air spring is provided directly above a side beam that has an auxiliary air chamber inside, interference between the air guide portion provided below the air spring and the cross beam that intersects the side beam within the auxiliary air chamber can be avoided. [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] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 4] FIG. 4 is an enlarged view of region α in FIG. 3. [Figure 5] FIG. 5 is a cross-sectional view corresponding to FIG. 4 in a first modified example. [Figure 6] FIG. 5 is a cross-sectional view corresponding to FIG. 4 in a second modified example. [Figure 7] FIG. 1 is a top view of a conventional bogie for a railway vehicle. [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. The auxiliary air chamber 111b communicates with the air chamber 132 (see FIG. 3) 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] 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.

[0023] The cross beam 112 is composed of left and right joints 112a that penetrate the side beams 111, and an intermediate portion 112b with an oval through-hole 112c. The joints 112a have an oval cross section and a predetermined width. The intermediate portion 112b is wider than the joints 112a and is formed to protrude in the direction of the rail, as shown in FIG. 1.

[0024] 2 and 3, air spring support 113 is provided directly above the portion where joint 112a of cross beam 112 penetrates side beam 111, and is composed of air spring seat 113a and air spring guide 113b. Air spring seat 113a has air spring 13 mounted on its upper surface, thereby transmitting the load of the car body to bogie frame 11.

[0025] Air spring guide 113b serves as a flow path for communicating air chamber 132 of air spring 13 with auxiliary air chamber 111b provided in side beam 111 of bogie frame 11, and is also used for positioning air spring 13 in the rail direction (i.e., X direction in FIG. 1) and sleeper direction (i.e., Y direction in FIG. 1). A boss 135 of air spring 13 is inserted into air spring guide 113b. Air spring guide 113b and boss 135 are inserted into insertion hole 111d of side beam 111. The gap between air spring guide 113b and boss 135 is sealed with a sealing member such as an O-ring. Air spring guide 113b and boss 135 are an example of an "air guide portion" in the present disclosure.

[0026] 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.

[0027] 3, air chamber 132 inside diaphragm 131 of air spring 13 communicates with auxiliary air chamber 111b of side beam 111. More specifically, air chamber 132 communicates with vent hole 136 of boss 135 provided below air spring 13 via space 134 in laminated rubber 133. Furthermore, vent hole 136 of boss 135 communicates with auxiliary air chamber 111b of side beam 111 via air spring guide 113b and through-flow passage portion 112d, which will be described later.

[0028] In this way, by sealing air in air chamber 132 while air chamber 132 of air spring 13 is connected to auxiliary air chamber 111b having a large volume, it is possible to obtain soft spring characteristics of air spring 13, which absorbs vibrations acting on the car body while the railway vehicle is running, improving the ride comfort.

[0029] [Air flow path structure between the air spring and the auxiliary air chamber] In this embodiment, the air chamber 132 of the air spring 13 that supports the car body is connected to the auxiliary air chamber 111b provided in the side beam 111 of the bogie frame 11, and a constant amount of air is secured by the air spring 13 and the auxiliary air chamber 111b.

[0030] In a conventional railway vehicle bogie 201, as shown in Fig. 7, air springs 13 are not provided directly above side beams 111, but are provided at positions outside side beams 111 in the sleeper direction. In other words, when viewed from above, the centers of air springs 13 are located outside side beams 111 in the sleeper direction of bogie frame 11 (upper or lower side in Fig. 7), and are arranged at positions that do not overlap with side beams 111.

[0031] 8, boss 135 and air spring guide 113b provided below air spring 13 are positioned outward (on the left side in FIG. 8) in the sleeper direction (Y direction) from side beam 111. A crank-shaped airtight pipe 211 is provided within cross beam 112 as an air flow path structure between air spring 13 and auxiliary air chamber 111b.

[0032] However, when the air spring 13 is provided directly above the side beam 111 (more specifically, when the center of the air spring 13 is positioned so as to overlap with the side beam 111 when viewed from above), it is not easy in terms of space to adopt the conventional airtight piping 211 shown in Figure 8 as the air flow path structure between the air spring 13 and the auxiliary air chamber 111b.

[0033] Furthermore, the positional relationship between air spring 13 and side beam 111 and cross beam 112 differs depending on the type of railway vehicle, and in some cases, air spring guide 113b, into which boss 135 is inserted, may interfere with cross beam 112 inside side beam 111. This means that the air flow path structure must be changed depending on the type of railway vehicle.

[0034] 3 and 4, in this embodiment, cross beam 112 is provided with through-flow passage portion 112d at the portion where it intersects with side beam 111 within auxiliary air chamber 111b. This through-flow passage portion 112d is formed in a tubular (e.g., cylindrical) shape and penetrates cross beam 112 in the up-and-down direction (Z direction), connecting air spring guide 113b, into which boss 135 is inserted, with auxiliary air chamber 111b. The inner diameter ID of through-flow passage portion 112d is made larger than the outer diameter OD of lower end portion 113ba of air spring guide 113b.

[0035] In this way, when air spring 13 is provided directly above side beam 111 having auxiliary air chamber 111b therein, inner diameter ID of through-flow passage portion 112d of cross beam 112 arranged in auxiliary air chamber 111b is larger than outer diameter OD of air spring guide 113b. This makes it possible to avoid interference between air spring guide 113b and through-flow passage portion 112d of cross beam 112.

[0036] Furthermore, because through-flow passage 112d penetrates cross beam 112 in the vertical direction, air can easily flow between air spring guide 113b and auxiliary air chamber 111b via through-flow passage 112d. Therefore, air can easily flow between air chamber 132 of air spring 13 and auxiliary air chamber 111b via boss 135 (vent hole 136 thereof), air spring guide 113b, and through-flow passage 112d.

[0037] In this embodiment, as shown in FIGS. 3 and 4, a part of air spring guide 113b, that is, lower end 113ba thereof, is inserted into through-flow path portion 112d.

[0038] In this way, by inserting air spring guide 113b into through-flow passage portion 112d, the height at which air spring support 113 is disposed can be lowered, and therefore the height at which air spring 13 provided on air spring seat 113a of air spring support 113 is disposed can be lowered. Therefore, it is possible to prevent railway vehicle bogie 1 from becoming larger in size.

[0039] 3 and 4, in this embodiment, air spring guide 113b and through-flow passage 112d are not joined (i.e., not sealed) but are formed separately. That is, a gap δ is provided between lower end 113ba of air spring guide 113b and upper end 112da of through-flow passage 112d.

[0040] As a result, even if the positional relationship between air spring 13 and side beam 111 and cross beam 112 varies depending on the type of railway vehicle in which railway vehicle bogie 1 is used, the positional relationship between air spring 13 and side beam 111 and cross beam 112 can be adjusted by adjusting the positional relationship between air spring guide 113b and boss 135 and through-flow passage portion 112d. Therefore, it is not necessary to change the air flow passage structure between air chamber 132 of air spring 13 and auxiliary air chamber 111b depending on the type of railway vehicle. Therefore, railway vehicle bogie 1 can be made versatile for use with different types of railway vehicles.

[0041] 3 and 4, the through-flow passage portion 112d is formed in a straight pipe shape (for example, a straight cylindrical pipe shape) in the vertical direction. Note that a straight pipe shape means a cylindrical shape whose central axis is positioned on a straight line.

[0042] In this way, through flow path portion 112d with a simple structure can ensure an air flow path between air chamber 132 of air spring 13 and auxiliary air chamber 111b. Furthermore, resistance to the air flow is reduced within through flow path portion 112d, making it easier for air to flow, and therefore air can easily flow between air chamber 132 of air spring 13 and auxiliary air chamber 111b via through flow path portion 112d.

[0043] 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.

[0044] For example, as a first modified example, as shown in FIG. 5, air spring guide 113b may be located close to through-flow passage portion 112d without entering into through-flow passage portion 112d.

[0045] In addition, as a second modified example, as shown in Figure 6, when the lower end 135a of the boss 135 protrudes downward further than the lower end 113ba of the air spring guide 113b, the inner diameter ID of the through flow passage portion 112d is made larger than the outer diameter OD1 of the boss 135. [Explanation of symbols]

[0046] 1. Railway vehicle bogies 11 Bogie frames for railway vehicles (bogie frames) 111 Side beam 111b Auxiliary air chamber 112 Crossbeam 112d Through-flow passage 112da upper end 113 Air spring support 113b Air spring guide 113ba bottom end 12 wheelset 13 Air spring 131 diaphragm 132 Air Chamber 135 Boss 135a Lower end ID (through-flow section) inner diameter OD (Air Spring Guide) Outside Diameter OD1 (Boss) Outside Diameter δ Gap

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; an air guide portion provided below the air spring; 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 air spring is provided at a position directly above the side beam, the cross beam includes a through-flow passage portion that passes through the cross beam in the vertical direction at a portion where the cross beam intersects with the side beam within the auxiliary air chamber and that connects the air guide portion and the auxiliary air chamber; an inner diameter of the through-flow passage portion is larger than an outer diameter of the air guide portion; A bogie for a railway vehicle characterized by:

2. The bogie for a railway vehicle according to claim 1, the air guide portion is inserted into the through-flow passage portion or is close to the through-flow passage portion; A bogie for a railway vehicle characterized by:

3. The bogie for a railway vehicle according to claim 1 or 2, the air guide portion and the through-flow passage portion are not joined together but are formed separately; A bogie for a railway vehicle characterized by:

4. The bogie for a railway vehicle according to claim 1 or 2, the through-flow passage portion is formed in a straight pipe shape; A bogie for a railway vehicle characterized by:

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