A bogie and rail vehicle

Abstract

This invention discloses a bogie and a rail vehicle. The bogie includes a frame, an axle box, a wheel axle, and a linear motor. The linear motor includes a stator assembly and a mover assembly. The mover assembly is mounted in the axle box, which is connected to the wheel axle. The stator assembly is mounted in the frame, and the mover assembly is located within the stator assembly and can move vertically relative to the stator assembly. In actual operation, when the wheel axle experiences vertical runout due to track irregularities, the mover assembly follows this runout and moves vertically relative to the stator assembly. Compared to traditional solutions, this invention, by using a linear motor as a vertical vibration damping device for the bogie, effectively achieves vibration isolation, thereby improving the bogie's operational stability.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and in particular to a bogie and a rail vehicle. Background Technology

[0002] For bogies of traditional rail vehicles, the primary suspension generally adopts axle box positioning methods such as swing arm type, guide column type, and pull plate type. In order to prevent the vibration between wheel and rail (or unsprung vibration, wheel and axle vibration) from being transmitted to the spring (or frame), vertical dampers, axle box springs or primary suspension rubber stacks are generally used, or semi-active or active controlled hydraulic dampers are used.

[0003] However, whether it is a vertical damper, axle box spring, rubber stack, or active control damper, all of them reduce vibration through stiffness or damping, and the vibration reduction effect is difficult to meet the high requirements.

[0004] Therefore, how to improve the vibration reduction effect of bogies is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One object of the present invention is to provide a bogie that can effectively improve its vibration reduction effect, and another object is to provide a rail vehicle including the above-mentioned bogie.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A bogie includes: a frame, an axle housing, a wheel axle, and a linear motor. The linear motor includes a stator assembly and a mover assembly. The mover assembly is mounted on the axle housing, which is connected to the wheel axle. The stator assembly is mounted on the frame. The mover assembly is located within the stator assembly and is capable of vertical movement relative to the stator assembly.

[0008] In some embodiments, a vertical displacement sensor is provided between the stator assembly and the mover assembly, the vertical displacement sensor being used to detect the vertical displacement of the mover assembly relative to the stator assembly.

[0009] In some embodiments, a first rubber stack is provided between the frame and the stator assembly.

[0010] In some embodiments, a second rubber stack is provided between the mover assembly and the axle housing.

[0011] In some embodiments, the stator assembly includes a magnetically controllable excitation coil and a guide portion, the guide portion being located within the excitation coil, and the upper end of the mover assembly being vertically movably connected to the guide portion.

[0012] In some embodiments, the lower end of the guide portion is connected to the lower end of the stator assembly via a flange.

[0013] In some embodiments, the lower end of the mover assembly is provided with a radially extending flange, the second rubber stack is located between the shaft housing and the flange, and a spring is sleeved on the mover assembly, the upper end of the spring abutting against the stator assembly and the lower end abutting against the flange.

[0014] In some embodiments, the flange and the second rubber stack are connected to the axle box body by bolts.

[0015] In some embodiments, the bottom of the frame is provided with a plurality of axle boxes, and each axle box is provided with a corresponding linear motor. Each linear motor can independently adjust the height of the corresponding axle box relative to the frame.

[0016] A rail vehicle comprising the bogie described in any of the preceding claims.

[0017] Compared with existing technologies, the above technical solution has at least the following advantages:

[0018] This invention provides a bogie comprising: a frame, an axle box, a wheel axle, and a linear motor. The linear motor includes a stator assembly and a mover assembly. The mover assembly is mounted in the axle box, which is connected to the wheel axle. The stator assembly is mounted in the frame, and the mover assembly is located within the stator assembly and is capable of vertical movement relative to the stator assembly. During actual operation, when the wheel axle experiences vertical runout due to track irregularities, the mover assembly follows this runout and moves vertically relative to the stator assembly. Compared to traditional solutions, this invention, by using a linear motor as a vertical vibration damping device for the bogie, effectively achieves vibration isolation, thereby improving the bogie's operational stability.

[0019] The rail vehicle provided by the present invention also has corresponding advantages because it includes the aforementioned bogie. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a bogie provided in a specific embodiment of the present invention.

[0022] The attached figures are labeled as follows:

[0023] 10-Frame; 20-Shaft housing; 30-Wheel axle; 40-Linear motor; 41-Stator assembly; 42-Motor assembly; 421-Flange; 43-Guide part; 50-First rubber stack; 60-Second rubber stack; 70-Spring. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a bogie provided in a specific embodiment of the present invention.

[0026] The bogie provided in this embodiment of the invention is a key load-bearing and guiding component for rail vehicles traveling on tracks. The bogie includes: a frame 10, an axle box 20, a wheel axle 30, and a linear motor 40. The frame 10 is a frame structure, usually welded from side beams and cross beams or formed by other means. The frame 10 is the basic skeleton of the entire bogie. The linear motor 40 includes a stator assembly 41 and a mover assembly 42. The mover assembly 42 is mounted on the axle box 20. For example, the lower end of the mover assembly 42 can be fixed to the axle box 20 by bolts. The axle box 20 is connected to the wheel axle 30. Therefore, the mover assembly 42 is indirectly rigidly connected to the wheel axle 30. The wheel axle 30 can rotate relative to the axle box 20. The vertical movement of the wheel axle 30 is transmitted to the mover assembly 42 through the axle box 20. The stator assembly 41 is mounted on the frame 10 and can be fixed to the lower part of the frame 10 or the inner side of the side beam by fasteners. The mover assembly 42 is located inside the stator assembly 41 and can move vertically relative to the stator assembly 41. The stator assembly 41 is usually configured as a hollow cylindrical or frame structure with a cavity inside. The main body of the mover assembly 42 is located in the cavity. A necessary air gap is maintained between the outer wall of the mover assembly 42 and the inner wall of the stator assembly 41 to ensure that the two can move relative to each other without contact. When the train travels on an uneven track, the wheel axle 30 moves up and down with the undulation of the track, driving the mover assembly 42 connected to it to move vertically relative to the stator assembly 41 fixed on the frame 10.

[0027] In conventional bogies, the axle box 20 is typically connected to the frame 10 via a primary suspension system, such as a primary spring 70. In this embodiment, a linear motor 40 is used as the core structure connecting the axle box 20 and the frame 10. The linear motor 40 is a device capable of converting electrical energy into linear motion mechanical energy. During actual operation, when the axle 30 experiences vertical movement due to track irregularities, the mover assembly 42 follows suit, moving vertically relative to the stator assembly 41. At this time, if the excitation current of the stator assembly 41 is actively controlled, a controllable vertical electromagnetic force can be generated, acting on the mover assembly 42. This force can completely or partially offset the impact force from the track, or actively press the axle 30 downward to increase adhesion, or lift it upward to reduce wheel weight. Therefore, the linear motor 40 acts as an active suspension actuator. The vertical movement of the mover assembly 42 within the stator assembly 41 is a dynamic adjustment of the relative position between the two. This design cleverly utilizes the structural characteristics of the linear motor 40, greatly simplifying the mechanical structure of the bogie. Compared with traditional solutions, this embodiment effectively achieves vibration isolation by using the linear motor 40 as a vertical vibration damping device for the bogie, thereby improving the operational stability of the bogie.

[0028] In some embodiments, a vertical displacement sensor is provided between the stator assembly 41 and the mover assembly 42. This sensor can detect the vertical displacement of the mover assembly 42 relative to the stator assembly 41 in real time. The vertical displacement sensor can be a non-contact sensor, such as a laser displacement sensor, an ultrasonic sensor, or an eddy current sensor based on the principle of electromagnetic induction. The sensor's transmitting or fixed end can be mounted on the inner wall or top end cap of the stator assembly 41, while its receiving end or target can be mounted at a corresponding position on the upper end face or outer wall of the mover assembly 42. The sensor's measurement axis is parallel to the direction of movement of the mover assembly 42. The detection signal line of the vertical displacement sensor is connected to the bogie's local controller or the overall control system of the rail vehicle. This sensor can detect the vertical displacement value of the mover assembly 42 relative to the stator assembly 41 in real time and accurately. The vertical displacement of the mover assembly 42 relative to the stator assembly 41 is essentially the vertical displacement of the wheel axle 30 relative to the frame 10, and this displacement is a core feedback variable in the active suspension control algorithm. By using vertical displacement sensors, the control system can accurately determine the real-time position of each axle 30 relative to the frame 10. For example, when the displacement of the outer wheel axle 30 relative to the frame 10 increases while the vertical displacement of the inner wheel decreases, the control system, upon receiving these displacement signals, can quickly calculate and adjust the current flowing to the excitation coil in the stator assembly 41 of the linear motor 40, thereby changing the vertical electromagnetic force acting on the mover assembly 42. Furthermore, this displacement signal can also be used to diagnose the operating status of the suspension system or the linear motor 40 itself. For example, if the vertical displacement sensor detects that the mover assembly 42 is in a state of off-center position for an extended period, it may indicate abnormal conditions such as uneven wheelset wear. Therefore, by adding vertical displacement sensors, precise input is provided for closed-loop active suspension control, making it possible to dynamically adjust the vertical load of each wheel in real time according to road conditions and vehicle posture, greatly improving the active safety and ride comfort of the rail vehicle.

[0029] In some embodiments, a first rubber stack 50 is provided between the frame 10 and the stator assembly 41. When the frame 10 is subjected to vibrations from the vehicle body, the first rubber stack 50 can absorb these vibrations and prevent them from being transmitted to the stator assembly 41. Since the stator assembly 41 includes a precision excitation coil and magnetic circuit structure, reducing vibration helps to improve its reliability and lifespan, and reduces additional noise caused by vibration. In addition, the elastic deformation of the first rubber stack 50 can also adapt to the installation error or manufacturing tolerance between the stator assembly 41 and the frame 10. Compared with a rigid connection, the first rubber stack 50 can ensure the transmission of basic force while effectively cutting off the transmission path of high-frequency vibration. A second rubber stack 60 is provided between the mover assembly 42 and the axle box 20. The structure of the second rubber stack 60 is similar to that of the first rubber stack 50. The upper end face of the second rubber stack 60 is connected to the lower end face of the mover assembly 42, and its lower end face is fixedly connected to the upper end face of the axle box 20. The vertical movement of the wheel axle 30 is first transmitted from the axle box 20 to the second rubber stack 60, and then from the second rubber stack 60 to the mover assembly 42. The first rubber stack 50 and the second rubber stack 60 have large vertical stiffness and small longitudinal and lateral stiffness. Since the axle box positioning device of the railway vehicle bogie is generally a swing arm type, guide column type, or pull plate type positioning device, especially for high-speed trains, a relatively strict longitudinal positioning stiffness is required. Since the linear motor 40 damper can only produce vertical relative displacement and cannot produce longitudinal (vehicle forward direction) and lateral (vehicle width direction) displacement, a rubber stack with small longitudinal and lateral stiffness is required to prevent the linear motor 40 from affecting the axle box positioning function of the wheel axle 30.

[0030] In some embodiments, the stator assembly 41 includes a magnetically controllable excitation coil and a guide portion 43. The magnetically controllable excitation coil enables controlled movement of the mover assembly 42. When the axle 30 vibrates and is displaced by vertical excitation from the wheel and rail, the stator assembly 41 and the axle 30 can be restored to their normal state before vibration under magnetic force, maintaining the vertical relative position between the axle 30 and the frame 10. The guide portion 43 is located within the excitation coil, and the upper end of the mover assembly 42 is vertically movably connected to the guide portion 43. The guide portion 43 can be selected as a low-friction insulating sleeve. The guide portion 43 restricts the radial movement of the upper end of the mover assembly 42, allowing the mover assembly 42 to move only vertically, ensuring that the air gap between the mover assembly 42 and the stator assembly 41 remains constant, thereby ensuring the precise application of the vertically controllable force.

[0031] In some embodiments, the lower end of the guide portion 43 is connected to the lower end of the stator assembly 41 via a flange. The lower end of the stator assembly 41 is provided with a mating end face. During assembly, the guide portion 43 is inserted into the inner cavity of the stator assembly 41 from below until the flange contacts the lower end face of the stator assembly 41. Then, it is fixed by fasteners. When the guide portion 43 is worn, the fasteners can be removed, and the guide portion 43 can be removed and replaced without disassembling the stator assembly 41, which can effectively reduce maintenance costs.

[0032] In some embodiments, the lower end of the mover assembly 42 is provided with a radially extending flange 421. The flange 421 may be an annular structure. The flange 421 provides a support surface for the lower end of the spring 70. The second rubber stack 60 is located between the axle box 20 and the flange 421. The spring 70 is sleeved on the mover assembly 42. The upper end of the spring 70 abuts against the stator assembly 41, and the lower end abuts against the flange 421. The spring 70 may be a helical compression spring 70. Under static conditions, the weight of the rail vehicle is ultimately transmitted to the wheel axle 30 through the frame 10, stator assembly 41, spring 70, flange 421, second rubber stack 60, and axle box 20. Here, the spring 70 mainly bears the static load and provides relatively soft suspension stiffness, while the second rubber stack 60 provides a relatively stiff elastic structure and plays a role in buffering and reducing friction between the flange 421 and the axle box 20. When the excitation coil generates a controllable electromagnetic force, this force is superimposed on the elastic force of the spring 70 and acts together on the flange 421. The advantages of this design are: the spring 70 bears the constant load such as the weight of the vehicle body, so that the active force only needs to provide the dynamic adjustment part, which greatly reduces the power demand and energy consumption of the linear motor 40; secondly, even if the linear motor 40 fails completely, the spring 70 and the second rubber stack 60 can still provide sufficient passive suspension capability, which improves the safety redundancy of the system.

[0033] In some embodiments, the flange 421 and the second rubber stack 60 are connected to the axle box 20 by bolts. For example, the second rubber stack 60, the flange 421, and the axle box 20 are provided with coaxial through holes, and the upper end of the bolt is preferably lower than the upper end face of the flange 421. The bolt connection can reliably ensure the transmission of force. In addition, it has the advantage of being detachable, which facilitates subsequent maintenance operations. For example, when the second rubber stack 60 needs to be replaced, simply loosen the bolts, separate the mover assembly 42 and the axle box 20, and then replace it with a new second rubber stack 60.

[0034] In some embodiments, the bottom of the frame 10 is provided with multiple axle boxes 20. For example, two axle boxes 20 distributed in the front-rear direction are respectively provided on both sides of the bottom of the frame 10. Each axle box 20 is provided with a linear motor 40. Each linear motor 40 can independently adjust the height of the corresponding axle box 20 relative to the frame 10. For example, when the vehicle turns, the control system can instruct the inner linear motor 40 to generate a downward force, pressing the inner wheel against the track to increase traction; at the same time, it can instruct the outer linear motor 40 to generate an upward force, slightly unloading the outer wheel to prevent the wheel from lifting off. During the manufacturing process of the bogie equipped with linear motors 40, the height of each axle box 20 relative to the frame 10 can be adjusted by adjusting the theoretical 0 position of the mover assembly 42 within the stator assembly 41, thereby adjusting the load borne by each wheel to adjust the wheel weight difference of the vehicle to meet the requirements. Compared with the traditional method of manually applying shims through the lower part of the axle box spring 70, this method can effectively improve the convenience of operation. By configuring an independent linear motor 40 on each axle box 20, independent and active adjustment of the vertical load and position of the wheel is achieved.

[0035] This invention also provides a rail vehicle, including the bogie provided in any of the above embodiments. The beneficial effects of the rail vehicle can be referred to the bogie provided in any of the above embodiments, and will not be repeated here.

[0036] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0038] The bogie and rail vehicle provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A bogie, characterized in that, include: The frame (10), axle box (20), wheel axle (30) and linear motor (40) include a stator assembly (41) and a mover assembly (42). The mover assembly (42) is mounted on the axle box (20) and the axle box (20) is connected to the wheel axle (30). The stator assembly (41) is mounted on the frame (10). The mover assembly (42) is located inside the stator assembly (41) and is capable of vertical movement relative to the stator assembly (41).

2. The bogie according to claim 1, characterized in that, A vertical displacement sensor is provided between the stator assembly (41) and the mover assembly (42), and the vertical displacement sensor is used to detect the vertical displacement of the mover assembly (42) relative to the stator assembly (41).

3. The bogie according to claim 1, characterized in that, A first rubber stack (50) is provided between the frame (10) and the stator assembly (41).

4. The bogie according to claim 3, characterized in that, A second rubber stack (60) is provided between the moving part assembly (42) and the axle box body (20).

5. The bogie according to claim 4, characterized in that, The stator assembly (41) includes a magnetically controllable excitation coil and a guide portion (43), the guide portion (43) being located inside the excitation coil, and the upper end of the mover assembly (42) being vertically movable and connected to the guide portion (43).

6. The bogie according to claim 5, characterized in that, The lower end of the guide section (43) is connected to the lower end of the stator assembly (41) via a flange.

7. The bogie according to claim 4, characterized in that, The lower end of the mover assembly (42) is provided with a radially extending flange (421), the second rubber stack (60) is located between the shaft box (20) and the flange (421), and a spring (70) is sleeved on the mover assembly (42). The upper end of the spring (70) abuts against the stator assembly (41), and the lower end abuts against the flange (421).

8. The bogie according to claim 7, characterized in that, The flange (421) and the second rubber stack (60) are connected to the axle box body (20) by bolts.

9. The bogie according to any one of claims 1 to 8, characterized in that, The bottom of the frame (10) is provided with a plurality of axle boxes (20), and each axle box (20) is provided with a corresponding linear motor (40). Each linear motor (40) can independently adjust the height of the corresponding axle box (20) relative to the frame (10).

10. A rail vehicle, characterized in that, Includes the bogie as described in any one of claims 1 to 9.

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