Foundation braking device, three-axle bogie and railway vehicle

Abstract

The utility model provides a foundation braking device, a three-axle bogie and a railway vehicle. Arrangement of a floating lever is facilitated. The foundation brake device comprises three brake beams, namely the first brake beam, the second brake beam and the third brake beam, and each brake beam is connected with a brake shoe; the foundation brake device further comprises a first floating lever, a fixed lever, a second floating lever and a pull rod, the first floating lever is connected with the first brake beam, one end of the fixed lever is connected with the first floating lever through the pull rod, the other end of the fixed lever is used for being connected with a framework of the three-axle bogie, and the second floating lever is connected with the second brake beam through the pull rod. The fixed lever is connected with the second brake beam; the second floating lever is connected with the third brake beam, and one end of the second floating lever is used for being connected with a framework of the three-axle bogie.

Description

Technical Field

[0001] The present application relates to the technical field of rail vehicles, and in particular to a basic braking device, a three-axle bogie and a rail vehicle. Background Art

[0002] A bogie consists of a frame, wheelsets mounted on the frame, and a basic brake system for braking the wheelsets. For two-axle bogies, braking is accomplished using a floating lever and a fixed lever. The fixed lever is connected to the brake system's tie rod. The tie rod pulls the floating lever, which in turn drives the brake shoes on the brake beam to brake one wheelset. The floating lever can also simultaneously drive the fixed lever, which in turn drives the brake shoes on the corresponding brake beam to brake the other wheelset.

[0003] As the number of bogie wheelsets increases, there are three-axle bogies, that is, they have three sets of wheelsets. At this time, in order to achieve braking, transition levers and intermediate levers are added. The floating lever brakes one set of wheelsets, and the floating lever and the intermediate lever, transition lever, and fixed lever are connected in sequence. The floating lever drives the intermediate lever to move to brake another set of wheelsets, and then transmits power to the transition lever and fixed lever through the intermediate lever to brake the last set of wheelsets.

[0004] Under this setting method, transition levers, intermediate levers, etc. need to be set up, and these components also need to be connected through connecting parts. It is not easy to arrange them when the space under the frame is limited. In addition, the three-axle bogie has a large braking ratio requirement, and the floating lever needs a larger range of movement. When there are many components, it is difficult to reserve space to meet the range of movement requirements of the floating lever. Utility Model Content

[0005] The purpose of the present application is to provide a basic braking device, a three-axle bogie and a rail vehicle, which are conducive to the arrangement of a traveling lever.

[0006] To solve the above technical problems, the present application provides a basic brake device for a three-axle bogie, wherein the basic brake device includes three brake beams, namely a first brake beam, a second brake beam, and a third brake beam, each of which is connected to a brake shoe;

[0007] The basic braking device also includes a first floating lever, a fixed lever, a second floating lever and a pull rod. The first floating lever is connected to the first brake beam, one end of the fixed lever is connected to the first floating lever through the pull rod, the other end of the fixed lever is used to be connected to the frame of the three-axle bogie, and the fixed lever is connected to the second brake beam; the second floating lever is connected to the third brake beam, and one end of the second floating lever is used to be connected to the frame of the three-axle bogie.

[0008] Optionally, the first floating lever, the second floating lever and the fixed lever are all inclined relative to the vertical center axis plane of the three-axle bogie; the first floating lever and the fixed lever are located on one side of the center axis plane, and the second floating lever is located on the other side of the center axis plane.

[0009] Optionally, the foundation brake device further comprises a first mounting seat, and the fixed lever is connected to the frame of the three-axle bogie via the first mounting seat;

[0010] And / or, the basic braking device further comprises a second mounting seat, and the second floating lever is connected to the frame of the three-axle bogie via the second mounting seat.

[0011] Optionally, the upper end of the fixed lever is connected to the first mounting seat, and the lower end of the second floating lever is connected to the second mounting seat; the second mounting seat includes a bracket and a connecting frame connected to the bracket, the bracket is connected to the frame of the three-axle bogie, the connecting frame extends horizontally, one end of the connecting frame is connected to the lower end of the bracket, and the other end is connected to one end of the second floating lever.

[0012] Optionally, the basic braking device further comprises a cable, and each of the brake beams is suspended on the frame of the three-axle bogie via the cable.

[0013] Optionally, the basic braking device further includes a first pull rod and a second pull rod, wherein the first pull rod is connected to one end of the first floating lever, and the other end of the first floating lever is connected to the pull rod; the second pull rod is connected to the other end of the second floating lever.

[0014] Optionally, the first movable lever, the second movable lever and the fixed lever are all hinged to the corresponding brake beam.

[0015] Optionally, the brake beam includes a first rod portion, a second rod portion, and a third rod portion, wherein the first rod portion extends in a transverse direction of the three-axle bogie, one end of the first rod portion is connected to one end of the second rod portion, the other end of the first rod portion is connected to one end of the third rod portion, and the other end of the second rod portion is connected to the other end of the third rod portion;

[0016] The brake beam also includes a connecting beam, one end of which is connected to the middle part of the first rod portion, and the other end is connected to the position where the second rod portion and the third rod portion are connected to each other; the first floating lever, the second floating lever and the fixed lever are all hinged to the corresponding connecting beam of the brake beam.

[0017] The present application provides a three-axle bogie, comprising a frame and a basic braking device installed on the frame, wherein the basic braking device is any one of the above-mentioned basic braking devices.

[0018] The present application also provides a rail vehicle, which includes a bogie, and the bogie is the three-axle bogie described in the ninth item above.

[0019] The foundation brake system of the present application is provided with two floating levers. The power source of the braking system simultaneously transmits braking force to the two floating levers. One floating lever is responsible for braking one wheelset alone, while the other floating lever is responsible for braking another wheelset while also driving the braking of the middle wheelset corresponding to the fixed lever. This eliminates the need for multiple levers and tie rods to transmit braking force, simplifies the components of the foundation brake system, saves space, and easily meets the requirement for a larger range of movement of the floating levers in situations with a large braking ratio, such as three-axle bogies. This facilitates the arrangement of the floating levers.

[0020] The three-axle bogie and rail vehicle provided in this application include the above-mentioned basic braking device, and therefore have the same technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a three-axle bogie in an embodiment of the present application, illustrating the bottom of the three-axle bogie;

[0022] Figure 2 This is a front view of a three-axle bogie in an embodiment of the present application;

[0023] Figure 3 for Figure 2 A schematic structural diagram of the third brake unit of the central foundation brake device;

[0024] Figure 4 for Figure 2 A schematic structural diagram of the first brake unit and the second brake unit of the basic brake device;

[0025] Figure 5 for Figure 2 Bottom view of the middle three-axle bogie;

[0026] Figure 6 for Figure 5 A schematic structural diagram of the third brake unit of the central foundation brake device;

[0027] Figure 7 for Figure 5 A schematic structural diagram of the first brake unit and the second brake unit of the basic brake device;

[0028] Figure 8 for Figure 2Left side view of the middle three-axle bogie;

[0029] Figure 9 for Figure 8 Schematic diagram of the structure of the medium foundation brake device;

[0030] Figure 10 for Figure 7 A magnified schematic diagram of part A in the middle;

[0031] Figure 11 This is a structural diagram of the connection position between the second floating lever and the frame of the basic braking device in an embodiment of the present application.

[0032] The reference numerals are as follows: 100 - three-axle bogie; 10 - foundation brake device;

[0033] 11-third brake unit; 12-second brake unit; 13-first brake unit;

[0034] 1011 - third brake beam; 1012 - second brake beam; 1013 - first brake beam; 101c - first rod; 101b - second rod; 101a - third rod; 101d - connecting beam; 101d1 - through hole; 101e - roller; 101f - first pin; 101g - second pin;

[0035] 102-pull rod;

[0036] 1031 - second movable lever; 1031a - second connecting hole; 1032 - fixed lever; 1033 - first movable lever; 1033a - first connecting hole;

[0037] 104-first mounting seat;

[0038] 105-brake shoe;

[0039] 106-second mounting base; 1061-bracket; 1062-connecting frame;

[0040] 107- Cable;

[0041] 108-slide rail;

[0042] 20-wheel; 30-frame; 40-axle. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solutions of this application, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments. In the embodiments of this application, the terms "first", "second", etc. are only used to distinguish between identical or similar features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 This is a structural diagram of a three-axle bogie 100 in an embodiment of the present application, illustrating the bottom of the three-axle bogie 100; Figure 2 for Figure 1 Front view of the middle three-axle bogie 100.

[0045] The three-axle bogie 100 in this embodiment includes a frame 30, which is the foundation of the three-axle bogie 100. The frame 30 generally includes side beams located on both sides and a cross beam connecting the side beams. The remaining components of the three-axle bogie 100 are mounted on the frame 30. The "three-axle" in the three-axle bogie 100 in this embodiment means that the bogie includes three wheelsets, each of which includes an axle 40 and wheels 20 located at both ends of the axle 40. The three-axle bogie 100 in this embodiment also includes a basic braking device 10, which includes three brake units: a first brake unit 13, a second brake unit 12, and a third brake unit 11. Each brake unit is responsible for braking a wheelset. Figure 2 The three brake units are distributed from left to right in sequence. The first brake unit 13 is responsible for braking the rightmost wheel set, the second brake unit 12 is responsible for braking the middle wheel set, and the third brake unit 11 is responsible for braking the leftmost wheel set.

[0046] For details, please refer to Figures 3 to 9 , Figure 3 for Figure 2 A schematic structural diagram of the third brake unit 11 of the basic brake device 10; Figure 4 for Figure 2 A schematic structural diagram of the first brake unit 13 and the second brake unit 12 of the basic brake device 10; Figure 5 for Figure 2 Bottom view of the middle three-axle bogie 100; Figure 6 for Figure 5 A schematic structural diagram of the third brake unit 11 of the basic brake device 10; Figure 7 for Figure 5 A schematic structural diagram of the first brake unit 13 and the second brake unit 12 of the basic brake device 10; Figure 8 for Figure 2 A left side view of the middle three-axle bogie 100; Figure 9 for Figure 8 Schematic diagram of the structure of the basic braking device 10.

[0047] Each brake unit of the basic brake device 10 in this embodiment includes a brake beam, so the basic brake device 10 includes three brake beams in total, namely a first brake beam 1013, a second brake beam 1012, and a third brake beam 1011. The structure of each brake beam is basically the same. The brake beam in this embodiment is a bow beam, including a first rod portion 101c, a second rod portion 101b, and a third rod portion 101a. The first rod portion 101c extends generally in the transverse direction of the three-axle bogie 100, one end of the second rod portion 101b is connected to one end of the first rod portion 101c, one end of the third rod portion 101a is connected to the other end of the first rod portion 101c, and the other end of the second rod portion 101b is connected to the other end of the third rod portion 101a. Figure 6 and Figure 7 As shown, each brake beam is roughly a triangular beam structure, which is more reliable and conducive to stable and reliable braking of the wheelset.

[0048] Each brake beam is connected to a brake shoe 105, specifically two brake shoes 105. One brake shoe 105 is used to brake one wheel 20 in a wheelset. Brake shoes 105 are located at both ends of the brake beam in the transverse direction, allowing simultaneous braking of both wheels 20 in a wheelset. Braking is achieved by matching the shape of the braking surface of the brake shoe 105 with the outer wall of the wheel 20. During braking, the braking surface of the brake shoe 105 and the outer wall of the wheel 20 come into contact, resulting in friction braking.

[0049] by Figure 5 The perspective diagram shows the longitudinal and lateral directions of the three-axle bogie 100. The longitudinal and lateral directions mentioned in this application are two directions perpendicular to each other in the horizontal plane, wherein the longitudinal direction is also the front-to-back direction of the three-axle bogie 100. If the three-axle bogie 100 is applied to a rail vehicle, the front-to-back direction of the three-axle bogie 100 is also the length direction of the rail vehicle.

[0050] In this embodiment, the first brake unit 13 and the second brake unit 12 of the foundation brake device 10 are located between the middle wheel set and the adjacent wheel set. Figure 5 As shown, the first brake unit 13 and the second brake unit 12 are located between the rightmost wheelset and the middle wheelset. The first brake unit 13 includes a first brake beam 1013 and a first movable lever 1033, and the second brake unit 12 includes a second brake beam 1012 and a fixed lever 1032. The foundation brake device 10 also includes a pull rod 102 for connecting the first movable lever 1033 and the fixed lever 1032.

[0051] The first movable lever 1033 is connected to the first brake beam 1013 to drive the first brake beam 1013 to brake. The fixed lever 1032 and the first movable lever 1033 are connected via the pull rod 102. One end of the fixed lever 1032 is connected to the frame 20. The fixed lever 1032 is also connected to the second brake beam 1012. Thus, the first movable lever 1033 can drive the fixed lever 1032 to brake the second brake beam 1012. The "fixed" of the fixed lever 1032 and the "movable" of the first movable lever 1033 are relative terms. The fixed lever 1031 is not fixed and can actually move relative to the frame 30. However, one end of the fixed lever 1032 is connected to the frame 30. The first movable lever 1033 can transmit braking force.

[0052] For example, Figure 7 In the embodiment, one end of the first traveling lever 1033 has a first connecting hole 1033a, which can be defined as the first end of the first traveling lever 1033, and the other end as the second end. The second end of the first traveling lever 1033 is connected to the pull rod 102. The connection between the first traveling lever 1033 and the first brake beam 1013 is specifically hinged.

[0053] like Figure 10 As shown, Figure 10 for Figure 7 Enlarged schematic diagram of area A in the middle.

[0054] The brake beam also includes a connecting beam 101d, such as Figure 10 The first brake beam 1013 shown has a connecting beam 101d located in the middle of the first brake beam 1013. One end of the connecting beam 101d is connected to the middle of the first rod portion 101c, and the other end is connected to the position where the second rod portion 101b and the third rod portion 101a are connected. In this way, the connecting beam 101d can increase the strength of the first brake beam 1013 on the one hand, and facilitate connection with the first floating lever 1033 on the other hand. Figure 10 In the embodiment, the connecting beam 101d has a through-hole 101d1, through which the first movable lever 1033 passes. A first pin 101f passes through the connecting beam 101d and the first movable lever 1033, thereby achieving an articulated connection between the connecting beam 101d and the first movable lever 1033. Furthermore, the second end of the first movable lever 1033 is articulated to the pull rod 102 via a second pin 101g.

[0055] The basic brake device 10 may further include a first pull rod (not shown in the figure), which is connected to the first floating lever 1033, specifically through the first connecting hole 1033a, for example, through a pin inserted into the first connecting hole 1033. The first pull rod is connected to the power source of the braking system of the rail vehicle, that is, when braking is required, the first pull rod is subjected to a braking force, and the first pull rod can pull the first floating lever 1033 to Figure 5 From the perspective of perspective, the first pull bar pulls the first floating lever 1033 to the right, and the first floating lever 1033 drives the entire first brake beam 1013 to move right, and the brake shoe 105 installed on the first brake beam 1013 will be close to the corresponding wheel 20, thereby braking the rightmost set of wheels.

[0056] like Figure 7 As shown, the two ends of the fixed lever 1032 can be defined as the third end and the fourth end. The third end of the fixed lever 1032 is connected to the frame 30 of the three-axle bogie 100 through the first mounting seat 104, and the fourth end of the fixed lever 1032 is connected to the pull rod 102, and the connection method with the pull rod 102 is also hinged. The connection method of the fixed lever 1032 and the second brake beam 1012 is the same as the connection method of the first movable lever 1033 and the first brake beam 1013, which will not be repeated here. When the brake shoe 105 on the first brake beam 1013 is pressed against the wheel 20, the first brake beam 1013 cannot move. When the first pull rod continues to pull the first end of the first floating lever 1033, the first floating lever 1033 will rotate clockwise around the first pin shaft 101f, and the second end of the first floating lever 1033 will have a clockwise rotation trend and will push the pull rod 102 to the left. The pull rod 102 will correspondingly push the fourth end of the fixed lever 1032 to the left. Since the third end of the fixed lever 1032 is connected to the frame 30 through the first mounting seat 104, the fixed lever 1032 will drive the second brake beam 1012 to the left and press against the wheel 20 of the middle group of wheels, thereby achieving the purpose of braking.

[0057] The above is the braking process of the first brake unit 13 and the second brake unit 12. Figures 5 to 7 In this embodiment, the third brake unit 11 includes a second floating lever 1031 and a third brake beam 1011. One end of the second floating lever 1031 is connected to the frame 30 of the three-axle bogie 100, specifically via the second mounting bracket 106. The end of the second floating lever 1031 connected to the frame 30 can be defined as the fifth end, and the other end of the second floating lever 1031 is defined as the sixth end. In this case, the foundation brake device 10 may further include a second brace (not shown). The sixth end of the second floating lever 1031 is connected to the second brace, as shown in FIG. Figure 6As shown, the sixth end of the second floating lever 1031 has a second connecting hole 1031a, and the second pull bar is connected to the second floating lever 1031 through the second connecting hole 1031a, for example, by inserting a pin shaft into the second connecting hole 1031a to achieve the connection with the second pull bar.

[0058] The second pull rod is similar to the first pull rod, and is also connected to the power source of the rail vehicle's braking system. That is, the power source drives the first pull rod and the second pull rod to move at the same time. When braking is required, the second pull rod and the first pull rod are synchronously subjected to the braking force, and the second pull rod can pull the second floating lever 1031 to Figure 5 From the perspective of rotation, the second pull rod pulls the sixth end of the second floating lever 1031 to the left. Since the fifth end of the second floating lever 1031 is connected to the frame 30, the second floating lever 1031 drives the entire third brake beam 1011 to move left, and the brake shoe 105 installed on the third brake beam 1011 will be close to the corresponding wheel 20, thereby braking the leftmost set of wheels.

[0059] Thus, the foundation brake device 10 in the embodiment of the present application is provided with two floating levers. The power source of the braking system simultaneously transmits braking force to the two floating levers. One floating lever is solely responsible for braking one wheelset, while the other floating lever is responsible for braking another wheelset while also driving the braking of the middle wheelset corresponding to the fixed lever 1032. In this way, the foundation brake device 10 does not need to be provided with multiple levers and tie rods 102 to transmit braking force, which can simplify the components of the foundation brake device 10 and save space. This makes it easier to meet the requirement of a larger range of movement of the floating levers in the case of a three-axle bogie 100 with a large braking ratio, that is, to facilitate the layout of the floating levers.

[0060] like Figure 8 As shown, the three-axle bogie 100 can be defined as having a vertical center axis plane S, which is a vertical plane passing through the center axis of the three-axle bogie 100. In this embodiment, the first floating lever 1033, the second floating lever 1031 and the fixed lever 1032 are all tilted relative to the vertical center axis plane S of the three-axle bogie 100. The first floating lever 1033, the second floating lever 1031 and the fixed lever 1032 are tilted, which can make full use of the space below the frame 30, avoid interference with other components, and facilitate the first floating lever 1033 and the second floating lever 1031 to have a larger range of motion. The size of the tilt angle can be set according to the actual situation of the space below the frame 30, and this embodiment does not impose any specific restrictions. Specifically, as Figure 8 As shown, the first movable lever 1033 and the fixed lever 1032 are located on one side of the central axis plane S, and the second movable lever 1031 is located on the other side of the central axis plane S.

[0061] like Figure 1 As shown, the frame 30 of the three-axle bogie 100 in this embodiment is further provided with a slide rail 108, and a roller 101e is provided at the lateral end of each brake beam. The roller 101e can slide in the slide rail 108, and the slide rail 108 supports the roller 101e, thereby limiting the brake beam, that is, the slide rail 108 can support the brake beam from below without interfering with the braking action of the brake beam.

[0062] In addition, the foundation brake device 10 in this embodiment further includes a cable 107. Figure 8 As shown, each brake beam is suspended from the frame 30 of the three-axle bogie 100 via a cable 107, which can limit the position of the brake beam. A cable 107 can be connected to both ends of each brake beam in the transverse direction, with one end of each cable 107 connected to the brake beam and the other end connected to the frame 30.

[0063] Look again Figure 11 , Figure 11 Schematic diagram of the structure of the connection position between the second floating lever 1031 and the frame 30 of the foundation brake device 10 in the embodiment of the present application.

[0064] As previously described, the foundation brake device 10 in this embodiment further includes a second mounting base 106, which is used to be fixed to the frame 30. The second traveling lever 1031 is connected to the second mounting base 106. Exemplarily, the second mounting base 106 includes a bracket 1061 and a connecting frame 1062 connected to the bracket 1061. The connecting frame 1062 extends horizontally, with one end of the connecting frame 1062 connected to the lower end of the bracket 1061 and the other end connected to one end of the second traveling lever 1031.

[0065] Compared with the fixed lever 1031, the third end of the fixed lever 1031 is connected to the frame 30 through the first mounting seat 104. The third end is the upper end relative to the fourth end, which is easy to establish a connection with the frame 30. The fifth end of the second floating lever 1031 is used to connect to the frame 30. Relative to the sixth end connected to the second pull rod, the fifth end is the lower end of the second floating lever 1031. In order to facilitate the connection with the frame 30, this embodiment specially provides a downward extending bracket 1061 to lower the height of the second mounting seat 106, so that the second floating lever 1031 can be reliably connected to the frame 30 through the second mounting seat 106.

[0066] An embodiment of the present application further provides a rail vehicle, which includes a bogie. The bogie is the three-axle bogie 100 described in any of the above embodiments. The technical effects are the same as those of the above embodiments and will not be repeated here.

[0067] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A foundation brake device for a three-axle bogie (100), characterized in that: The basic brake device (10) comprises three brake beams, namely a first brake beam (1013), a second brake beam (1012), and a third brake beam (1011), each of the brake beams being connected to a brake shoe (105); The basic braking device (10) further includes a first floating lever (1031), a fixed lever (1032), a second floating lever (1033) and a pull rod (102), wherein the first floating lever (1031) is connected to the first brake beam (1013), one end of the fixed lever (1032) is connected to the first floating lever (1031) through the pull rod (102), the other end of the fixed lever (1032) is used to be connected to the frame (30) of the three-axle bogie (100), and the fixed lever (1032) is connected to the second brake beam (1012); the second floating lever (1033) is connected to the third brake beam (1011), and one end of the second floating lever (1033) is used to be connected to the frame (30) of the three-axle bogie (100).

2. The foundation brake device according to claim 1, characterized in that: The first floating lever (1031), the second floating lever (1033) and the fixed lever (1032) are all arranged to be inclined relative to the vertical center axis plane (S) of the three-axle bogie (100); the first floating lever (1031) and the fixed lever (1032) are located on one side of the center axis plane (S), and the second floating lever (1033) is located on the other side of the center axis plane (S).

3. The foundation brake device according to claim 2, characterized in that: The basic braking device further comprises a first mounting seat (104), and the fixed lever (1032) is connected to the frame (30) of the three-axle bogie (100) via the first mounting seat (104); And / or, the basic braking device (10) further includes a second mounting seat (106), and the second floating lever (1033) is connected to the frame (30) of the three-axle bogie (100) via the second mounting seat (106).

4. The foundation brake device according to claim 3, characterized in that: The upper end of the fixed lever (1032) is connected to the first mounting seat (104), and the lower end of the second floating lever (1033) is connected to the second mounting seat (106); the second mounting seat (106) includes a bracket (1061) and a connecting frame (1062) connected to the bracket (1061), the bracket (1061) is connected to the frame (30) of the three-axle bogie (100), and the connecting frame (1062) extends horizontally, with one end of the connecting frame (1062) connected to the lower end of the bracket (1061) and the other end connected to one end of the second floating lever (1033).

5. The foundation brake device according to claim 1, characterized in that: The basic braking device (10) further comprises a cable (107), and each of the brake beams is suspended on the frame (30) of the three-axle bogie (100) via the cable (107).

6. The foundation brake device according to any one of claims 1 to 5, characterized in that: The basic braking device (10) further comprises a first pull rod and a second pull rod, wherein the first pull rod is connected to one end of the first floating lever (1031), and the other end of the first floating lever (1031) is connected to the pull rod; and the second pull rod is connected to the other end of the second floating lever (1033).

7. The foundation brake device according to any one of claims 1 to 5, characterized in that: The first movable lever (1031), the second movable lever (1033) and the fixed lever (1032) are all hinged to the corresponding brake beam.

8. The foundation brake device according to claim 7, characterized in that: The brake beam comprises a first rod portion (101c), a second rod portion (101b), and a third rod portion (101a); the first rod portion (101c) extends transversely of the three-axle bogie (100); one end of the first rod portion (101c) is connected to one end of the second rod portion (101b); the other end of the first rod portion (101c) is connected to one end of the third rod portion (101a); and the other end of the second rod portion (101b) is connected to the other end of the third rod portion (101a); The brake beam further comprises a connecting beam (101d), one end of the connecting beam (101d) being connected to the middle portion of the first rod portion (101c), and the other end being connected to a position where the second rod portion (101b) and the third rod portion (101a) are connected to each other; the first movable lever (1031), the second movable lever (1033) and the fixed lever (1032) are all hinged to the corresponding connecting beam (101d) of the brake beam.

9. A three-axle bogie, characterized in that: The invention comprises a frame (30) and a basic braking device (10) installed on the frame, wherein the basic braking device (10) is the basic braking device (10) according to any one of claims 1 to 8.

10. A rail vehicle, characterized in that: The rail vehicle comprises a bogie, and the bogie is the three-axle bogie (100) according to claim 9.

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