Bogie frame and rail vehicle

Abstract

The application discloses a bogie frame and a railway vehicle, wherein the bogie frame comprises a side beam mechanism and a cross beam mechanism, the middle part of the side beam mechanism is connected with the cross beam mechanism, and the end part of the side beam mechanism is used for connecting a wheel set axle box; the side beam mechanism is two, and is connected with the two end parts of the cross beam mechanism respectively; and a plurality of mounting positions for mounting different steering basic parts are integrated on the cross beam mechanism. Compared with the prior art, the bogie frame disclosed by the application does not need to additionally set a plurality of mounting frames to mount the steering basic parts, but directly integrates the mounting positions on the cross beam mechanism, so that the bogie frame simplifies the side beam mechanism, the structure is simple, the weight of the bogie frame is greatly reduced, the light weight design is realized, the fatigue life of the railway vehicle is improved, the driving speed of the railway vehicle is further improved, and the interchange of the bogie of the railway vehicle is made possible through the cross beam mechanism integrating the mounting positions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail vehicle technology, in particular to a bogie frame and a rail vehicle. BACKGROUND

[0002] In recent years, high-speed railways have developed rapidly, and the types of vehicles have increased day by day, but the braking mode of the rail vehicle has not changed basically. The traditional motor car or urban rail vehicle mainly adopts the tread brake type, and the braking is implemented by the friction between the brake pad and the wheel. In practical application, the brake unit is usually installed at the position close to the center under the side beam of the frame, and other fixed seats and other components also need to be installed on the frame, so it is impossible to completely achieve balanced weight distribution. Therefore, the existing frame structure is complex, the weight is large, and the space occupied by each bearing component for installation is large, which is not conducive to the lightweight design of the bogie itself and the improvement of the driving speed of the vehicle.

[0003] Therefore, how to optimize the structure of the bogie frame to realize the lightweight design and effectively improve the driving speed of the rail vehicle is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a bogie frame which can realize lightweight design and effectively improve the driving speed of the rail vehicle.

[0005] Another purpose of the present application is to provide a rail vehicle.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A bogie frame, comprising a side beam mechanism and a cross beam mechanism, wherein the middle part of the side beam mechanism is connected to the cross beam mechanism, and the end part of the side beam mechanism is used to connect a wheelset axle box, the side beam mechanism is two, and is connected to the two end parts of the cross beam mechanism respectively, and the cross beam mechanism is integrated with a plurality of mounting positions for mounting different bogie basic components.

[0008] Optionally, the side beam mechanism comprises a side beam main body, a π-shaped positioning arm assembly and an auxiliary spring assembly;

[0009] The π-shaped positioning arm assembly is arranged at the center position of the side beam main body, and the auxiliary spring assembly is two and is arranged at the two ends of the side beam main body respectively;

[0010] The π-shaped positioning arm assembly and the auxiliary spring assembly are arranged at the lower end surface of the side beam main body, and the π-shaped positioning arm assembly and the auxiliary spring assembly are connected to the wheelset axle box.

[0011] Optionally, the side beam main body is a convex arched flexure spring, and the thickness of the side beam main body gradually thins from the middle to the two ends.

[0012] The middle part and the end part mounting area of the convex arched leaf spring are horizontal in the rated load bearing state.

[0013] Optionally, the π-shaped positioning arm assembly comprises a positioning arm body, and a first leg and a second leg respectively extending from two ends of the positioning arm body, the first leg and the second leg extend along the length direction of the positioning arm body and respectively extend towards opposite directions.

[0014] Optionally, the first pull rod and the second pull rod are further included, two ends of the first pull rod are respectively connected to the first leg and the wheelset axle box, and two ends of the second pull rod are respectively connected to the second leg and the wheelset axle box.

[0015] Optionally, the auxiliary spring assembly comprises a spring part and a support plate, one side of the support plate is fixedly connected to the spring part, and the other side is arranged on the lower end surface of the side beam body and abuts against the side beam body;

[0016] The upper part of the side beam body is further provided with limiting cover plates, the limiting cover plates are two and are respectively arranged at the two end parts of the side beam body, and are arranged one by one corresponding to the auxiliary spring assemblies, the limiting cover plates and the support plates are connected to enclose a space for limiting the vertical movement of the side beam body.

[0017] Optionally, a positioning pin is arranged on the support plate, a waist hole for the positioning pin to pass through is arranged on the side beam body, a through hole for the positioning pin to pass through is arranged on the limiting cover plate, and a positioning hole for cooperating with the wheelset axle box is arranged on the lower end surface of the spring part.

[0018] Optionally, the side beam body is formed by three-dimensional weaving of a variable cross-section carbon fiber bundle;

[0019] The π-shaped positioning arm assembly is integrally woven by the carbon fiber bundle, and is made by using a modified resin transfer molding injection process.

[0020] Optionally, the cross beam mechanism comprises a cross beam body and the mounting positions, and the mounting positions are integrated on the cross beam body.

[0021] Optionally, the mounting positions comprise a vertical damper mounting seat, an air spring mounting seat, a brake seat, a gear box hanger, a transverse stop seat, a motor mounting seat, an anti-rolling mounting seat and a transverse damper mounting seat.

[0022] The motor mounting seat comprises a first motor mounting seat and a second motor mounting seat, the first motor mounting seat and the second motor mounting seat are both T-shaped structures and are both made of elastic leaf springs, and the thicknesses of the first motor mounting seat and the second motor mounting seat gradually decrease from the middle to the two ends.

[0023] Optionally, a traction pin is arranged at the center of the cross beam body, and a traction seat is press-fitted with the traction pin through a rubber cylinder, and the lateral damper mounting seat is arranged on the traction seat.

[0024] Optionally, the air spring mounting seat is provided with a clamping bolt mounting hole, an air spring latch hole and a center positioning hole, and the clamping bolt mounting hole is provided with a mounting sleeve.

[0025] The mounting sleeve comprises a sleeve body, and a first anti-rotation part and a second anti-rotation part arranged on both sides of the sleeve body, respectively.

[0026] Optionally, a first rubber pad is arranged between the cross beam body and the side beam body, and a second rubber pad is arranged between the side beam body and the π-shaped positioning arm assembly.

[0027] A railway vehicle comprises the bogie frame according to any one of the above.

[0028] Compared with the prior art, the bogie frame disclosed in the embodiment of the present application does not need to additionally arrange a plurality of mounting frames to mount the bogie components, but directly integrates the mounting positions on the cross beam mechanism, so that the bogie frame is simplified, the structure is simple, the weight of the bogie frame is greatly reduced, the lightweight design is realized, the fatigue life of the railway vehicle is improved, the driving speed of the railway vehicle is further improved, and the interchange of the bogie of the railway vehicle is made possible through the integration of the mounting positions on the cross beam mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description are briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0030] Figure 1 The overall structure of the bogie frame disclosed in the embodiment of the present application is shown in the figure.

[0031] Figure 2 The three-dimensional structure of the side beam mechanism disclosed in the embodiment of the present application is shown in the figure.

[0032] Figure 3 The front view structure of the side beam mechanism disclosed in the embodiment of the present application is shown in the figure.

[0033] Figure 4 The figure is Figure 3A schematic diagram of the cross-sectional structure along the AA direction;

[0034] Figure 5 This is a schematic diagram of the triangular tie rod disclosed in the embodiment of the present invention;

[0035] Figure 6 This is a three-dimensional structural schematic diagram of the beam mechanism disclosed in the embodiments of the present invention;

[0036] Figure 7 This is a top view of the beam mechanism disclosed in the embodiment of the present invention;

[0037] Figure 8 This is a schematic front view of the beam mechanism disclosed in an embodiment of the present invention;

[0038] Figure 9 This is a side view of the beam mechanism disclosed in an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram of the structure of the mounting sleeve disclosed in the embodiments of the present invention;

[0040] Figure 11 This is a schematic diagram of a three-dimensional braided carbon fiber structure disclosed in an embodiment of the present invention.

[0041] The names of the components are as follows:

[0042] 100. Side beam mechanism; 101. Side beam body; 102. π-shaped positioning arm assembly; 1021. Positioning arm body; 1022. First support leg; 1023. Second support leg; 103. Auxiliary spring assembly; 1031. Spring part; 1032. Support plate; 1033. Positioning pin; 104. Limiting cover plate; 200. Crossbeam mechanism; 201. Vertical damper mounting base; 202. Air spring mounting base; 2021. Clamping bolt mounting hole; 2022. Air spring pin hole ; 2023, and center positioning hole; 2024, mounting sleeve; 2024a, sleeve body; 2024b, first anti-rotation part; 2024c, second anti-rotation part; 203, brake seat; 204, gearbox hanger; 205, lateral stop seat; 206, motor mounting seat; 207, anti-roll mounting seat; 208, lateral damper mounting seat; 300, traction pin; 400, traction seat; 500, first tie rod; 600, second tie rod; 700, carbon fiber bundle. Detailed Implementation

[0043] In view of this, the core of the present invention is to provide a bogie frame that can achieve a lightweight design, thereby effectively improving the travel speed of rail vehicles.

[0044] Another core aspect of this invention is providing a rail vehicle.

[0045] 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.

[0046] Please refer to Figures 1-11 ,in, Figure 1 This is a schematic diagram of the overall structure of the bogie frame disclosed in the embodiment of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the side beam mechanism disclosed in the embodiments of the present invention; Figure 3 This is a schematic diagram of the front view of the side beam mechanism disclosed in the embodiment of the present invention; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure along the AA direction; Figure 5 This is a schematic diagram of the triangular tie rod disclosed in the embodiment of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the beam mechanism disclosed in the embodiments of the present invention; Figure 7 This is a top view of the beam mechanism disclosed in the embodiment of the present invention; Figure 8 This is a schematic front view of the beam mechanism disclosed in an embodiment of the present invention; Figure 9 This is a side view of the beam mechanism disclosed in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the mounting sleeve disclosed in the embodiments of the present invention; Figure 11 This is a schematic diagram of a three-dimensional braided carbon fiber structure disclosed in an embodiment of the present invention.

[0047] Please refer to Figure 1 The steering frame component disclosed in this embodiment of the invention includes a side beam mechanism 100 and a crossbeam mechanism 200. The middle part of the side beam mechanism 100 is connected to the crossbeam mechanism 200, and the end of the side beam mechanism 100 is used to connect to the wheel set axle box. There are two side beam mechanisms 100, which are respectively connected to the two ends of the crossbeam mechanism 200. The crossbeam mechanism 200 integrates multiple mounting positions for mounting different steering base components.

[0048] Compared with the prior art, the bogie frame disclosed in the embodiments of the present invention does not require multiple additional mounting brackets to install the bogie base components. Instead, the mounting position is directly integrated into the crossbeam mechanism 200. Therefore, the above-mentioned bogie frame simplifies the side beam mechanism 100, has a simple structure, greatly reduces the weight of the bogie frame, realizes lightweight design, improves the fatigue life of the rail vehicle, further improves the running speed of the rail vehicle, and makes it possible to interchange the bogies of urban rail vehicles by integrating the mounting position through the crossbeam mechanism 200.

[0049] The specific structure of the side beam mechanism 100 in this embodiment of the invention is not limited. Any structure that meets the requirements of this invention is within the protection scope of this invention.

[0050] Please refer to Figures 2-4 As one possible embodiment, the side beam mechanism 100 disclosed in this embodiment of the invention includes a side beam body 101, a π-shaped positioning arm assembly 102, and an auxiliary spring assembly 103.

[0051] The π-shaped positioning arm assembly 102 is located at the center of the side beam body 101, and there are two auxiliary spring assemblies 103, which are respectively located at both ends of the side beam body 101.

[0052] It should be noted that the π-shaped positioning arm assembly 102 and the auxiliary spring assembly 103 are both located on the lower end face of the side beam body 101, and both the π-shaped positioning arm assembly 102 and the auxiliary spring assembly 103 are connected to the wheelset axle box.

[0053] With this configuration, the weight and load of the rail vehicle body are transmitted to the wheelset axle box via the π-type positioning arm assembly 102 and the auxiliary spring assembly 103, and then to the wheelset.

[0054] In this embodiment of the invention, the auxiliary spring assembly 103 is mainly used to provide damping and adjust vertical displacement, and to ensure that the side beam body 101 and the auxiliary spring assembly 103 are combined to improve their fatigue performance.

[0055] The specific structure of the side beam body 101 is not limited in the embodiments of the present invention. The side beam body 101 can be a plate structure or other structures. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0056] As one possible embodiment, the side beam body 101 disclosed in this embodiment of the invention is a convex arch warped leaf spring structure, wherein the convex arch warped leaf spring has more reliable stability than other structures, thereby improving the fatigue performance of the side beam mechanism 100.

[0057] In order to maximize the utilization of the structural flexural properties and tensile strength, the thickness of the side beam body 101 disclosed in the embodiments of the present invention is designed to gradually decrease from the middle to both ends.

[0058] Among them, the middle and end mounting areas of the arched warp leaf spring are horizontal under rated load conditions.

[0059] The present invention does not limit the specific structure of the π-type positioning arm assembly 102. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0060] As one possible embodiment, the π-shaped positioning arm assembly 102 disclosed in this embodiment of the invention includes a positioning arm body 1021 and a first leg 1022 and a second leg 1023 extending from both ends of the positioning arm body 1021, wherein the first leg 1022 and the second leg 1023 are both along the length direction of the positioning arm body 1021 and extend in opposite directions.

[0061] The first support leg 1022 and the second support leg 1023 are respectively provided with connection holes. The connection holes can be directly connected to the wheelset axle box, or they can be connected to the wheelset axle box through other connection structures.

[0062] Please refer to Figure 5 As one possible embodiment, the bogie frame disclosed in this invention further includes a first tie rod 500 and a second tie rod 600, wherein the two ends of the first tie rod 500 are respectively connected to a first support leg 1022 and a wheelset axle box, and the two ends of the second tie rod 600 are respectively connected to a second support leg 1023 and a wheelset axle box. This arrangement allows the wheelset axle box to have better radial rotation capability.

[0063] The embodiments of the present invention do not limit the specific structure of the first pull rod 500 and the second pull rod 600. The first pull rod 500 and the second pull rod 600 can be triangular pull rods or pull rods of other structures. As long as the structure meets the usage requirements of the present invention, it is within the protection scope of the present invention.

[0064] Of course, in order to achieve a stable connection, the π-shaped positioning arm assembly 102 disclosed in the embodiments of the present invention can be provided with at least two branch feet at the ends of the first foot 1022 and the second foot 1023 respectively, and the connection hole is provided on the branch feet. In this way, multi-point positioning can be achieved, thereby further improving the stability of the connection between the bogie frame and the wheelset axle box.

[0065] The specific structure of the auxiliary spring assembly 103 is not limited in the embodiments of the present invention. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0066] As one possible embodiment, the auxiliary spring assembly 103 disclosed in this embodiment of the invention includes a spring portion 1031 and a support plate 1032. One side of the support plate 1032 is fixedly connected to the spring portion 1031, and the other side is placed on the lower end face of the side beam body 101 and abuts against the side beam body 101.

[0067] The upper part of the side beam body 101 is also provided with a limiting cover plate 104. There are two limiting cover plates 104, which are respectively provided at both ends of the side beam body 101 and are provided in a one-to-one correspondence with the auxiliary spring assembly 103. The limiting cover plate 104 is connected to the support plate 1032 to form a space for restricting the vertical movement of the side beam body 101.

[0068] The specific structure of the limiting cover 104 is not limited in this embodiment of the invention. The limiting cover 104 can be a semi-circular structure or a U-shaped structure. Any structure that meets the requirements of this invention is within the protection scope of this invention.

[0069] In order to keep the vertical movement space of the side beam body 101 within an appropriate range, the present invention embodiment can control the distance between the limiting cover plate 104 and the side beam body 101 according to actual needs. The greater the distance between the limiting cover plate 104 and the side beam body 101, the larger the space formed between the limiting cover plate 104 and the side beam body 101, that is, the larger the range of vertical movement of the side beam body 101; conversely, the smaller the distance between the limiting cover plate 104 and the side beam body 101, the smaller the space formed between the limiting cover plate 104 and the side beam body 101, that is, the smaller the range of vertical movement of the side beam body 101.

[0070] To adjust the range of horizontal movement of the side beam body 101, the bogie frame disclosed in this embodiment of the invention includes a positioning pin 1033 on the support plate 1032, a slotted hole for the positioning pin 1033 to pass through on the side beam body 101, a through hole for the positioning pin 1033 to pass through on the limiting cover plate 104, and a positioning hole for engaging with the wheelset axle box on the lower end face of the spring part 1031. This configuration allows for slight longitudinal movement of the positioning pin 1033 within the slotted hole.

[0071] As one possible embodiment, the waist hole disclosed in this embodiment of the invention is further provided with a polymer synthetic material or stainless steel bushing in the circumferential direction. The bushing is made by a special sintering process and the outer layer is a graphite self-lubricating material, which has good wear resistance.

[0072] It should be noted that the side beam body 101 disclosed in the embodiments of the present invention is formed by three-dimensional weaving of variable cross-section carbon fiber bundles 700. That is, carbon fiber filament bundles of a certain strength are first made by carbon fiber winding process, and carbon fiber bundles are woven in the Z direction between the three-dimensional weaving leaf spring layers to enhance performance.

[0073] Please refer to Figure 11 The π-shaped positioning arm assembly 102 disclosed in this embodiment of the invention is made of three-dimensional integral weaving of carbon fiber bundles 700 and manufactured using an improved resin transfer molding injection process. This achieves high load-bearing capacity.

[0074] The carbon fiber bundles have a diameter greater than 1 mm, and are woven in a planar multi-filament group to maximize the tensile properties of the carbon fiber filaments, thereby enhancing the overall performance and interlayer strength of the arched warp leaf springs. Simultaneously, the carbon fiber composite frame disclosed in this invention can withstand various maximum vertical loads while transmitting longitudinal and lateral forces between the wheel and rail, and minimizes weight (reducing the weight of the urban rail vehicle bogie from 7.9t to 3.2t), reduces wheel-rail and motor vibration noise (by up to 3dB), improves dynamic performance by 15%, and achieves comfort and safety goals.

[0075] The present invention does not limit the specific structure of the beam mechanism 200. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0076] Please refer to Figures 6-9 As one possible embodiment, the beam mechanism 200 disclosed in this embodiment of the invention includes a beam body and a mounting position, wherein the mounting position is integrated on the beam body.

[0077] The main body of the crossbeam and multiple mounting positions are integrally molded, which improves the robustness and stability of the entire bogie frame.

[0078] As a specific embodiment, the mounting positions disclosed in the embodiments of the present invention include a vertical damper mounting seat 201, a spring mounting seat 202, a brake seat 203, a gearbox hanger 204, a lateral stop seat 205, a motor mounting seat 206, an anti-roll mounting seat 207, and a lateral damper mounting seat 208.

[0079] The motor mounting base 206 includes a first motor mounting base and a second motor mounting base. Both the first and second motor mounting bases are T-shaped structures and are made of elastic leaf springs. The thickness of both the first and second motor mounting bases gradually decreases from the middle to both ends. This design maximizes the utilization of the structure's flexural characteristics and tensile strength.

[0080] In order to limit the movement of the motor to a very small range, the first motor mounting base and the second motor mounting base disclosed in the embodiments of the present invention are respectively provided with limit stops in the middle.

[0081] To achieve low-position traction braking, the bogie frame disclosed in the embodiments of the present invention adopts a center pin traction structure.

[0082] Specifically, the bogie frame disclosed in this embodiment of the invention further includes a traction pin 300 and a traction seat 400, wherein the traction pin 300 is disposed at the center position of the crossbeam body, and the traction seat 400 is press-fitted to the traction pin 300 through a rubber sleeve.

[0083] The traction seat 400 is equipped with traction rod mounting seats on both sides, and the traction rod is mounted on the traction rod mounting seats to achieve a flexible connection between the traction seat 400 and the main body of the crossbeam.

[0084] It should be noted that the lateral damper mounting base 208 is set on the traction base 400. With this setting, lateral vibration can be greatly attenuated.

[0085] The air spring mounting base 202 is provided with a clamping bolt mounting hole 2021, an air spring pin hole 2022, and a center positioning hole 2023. A mounting sleeve 2024 is provided inside the clamping bolt mounting hole 2021. This arrangement allows for a rigid connection between the crossbeam body, the side beam body 101, and the π-shaped positioning mechanism.

[0086] Please refer to Figure 10 The mounting sleeve 2024 includes a sleeve body 2024a and a first anti-rotation part 2024b and a second anti-rotation part 2024c respectively disposed on both sides of the sleeve body 2024a.

[0087] The embodiments of the present invention do not limit the specific structure of the first anti-rotation part 2024b and the second anti-rotation part 2024c. The first anti-rotation part 2024b and the second anti-rotation part 2024c can be planar structures or other structures. As long as the structure meets the usage requirements of the present invention, it is within the protection scope of the present invention. The sleeve prevents rotation by using an irregular outer side and a clearance fit with the clamping bolt mounting hole 2021.

[0088] A first rubber pad is provided between the main body of the crossbeam and the main body of the side beam 101, and a second rubber pad is provided between the main body of the side beam 101 and the π-shaped positioning arm assembly 102. This arrangement can improve the fatigue resistance of the entire steering frame components.

[0089] The bogie frame disclosed in this invention can be interchanged with existing urban rail bogies. By finely adjusting the multi-functional integrated crossbeam mechanism 200 to set the interfaces of each integrated functional module, it can be adapted to the interface installation of existing urban rail vehicle bogies, thus realizing the interchangeability design of existing bogies.

[0090] This invention also discloses a rail vehicle, including a bogie frame as disclosed in any of the above embodiments.

[0091] Since the rail vehicle adopts the bogie frame disclosed in the above embodiments, the rail vehicle has the technical advantages of the above bogie frame, and the embodiments of the present invention will not elaborate on them one by one.

[0092] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0093] 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.

[0094] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steering frame, characterized in that, It includes a side beam mechanism and a crossbeam mechanism. The middle part of the side beam mechanism is connected to the crossbeam mechanism, and the end of the side beam mechanism is used to connect to the wheelset axle box. There are two side beam mechanisms, which are respectively connected to the two ends of the crossbeam mechanism. The crossbeam mechanism integrates multiple mounting positions for installing different steering base components. The side beam mechanism includes a side beam body, a π-shaped positioning arm assembly, and an auxiliary spring assembly. The π-shaped positioning arm assembly is located at the center of the side beam body, and there are two auxiliary spring assemblies, which are respectively located at both ends of the side beam body. Both the π-shaped positioning arm assembly and the auxiliary spring assembly are located on the lower end face of the side beam body, and both the π-shaped positioning arm assembly and the auxiliary spring assembly are connected to the wheelset axle box. The main body of the side beam is a convex arch warped leaf spring, and the thickness of the main body of the side beam gradually decreases from the middle to both ends; the middle and end mounting areas of the convex arch warped leaf spring are horizontal under rated load conditions.

2. The steering frame according to claim 1, characterized in that, The π-shaped positioning arm assembly includes a positioning arm body and a first leg and a second leg extending from both ends of the positioning arm body, respectively. The first leg and the second leg are both along the length of the positioning arm body and extend in opposite directions.

3. The steering frame according to claim 2, characterized in that, It also includes a first pull rod and a second pull rod, the two ends of the first pull rod being connected to the first support leg and the wheelset axle box respectively, and the two ends of the second pull rod being connected to the second support leg and the wheelset axle box respectively.

4. The steering frame according to claim 1, characterized in that, The auxiliary spring assembly includes a spring part and a support plate. One side of the support plate is fixedly connected to the spring part, and the other side is placed on the lower end face of the side beam body and abuts against the side beam body. The upper part of the side beam body is also provided with a limiting cover plate. There are two limiting cover plates, which are respectively provided at both ends of the side beam body and correspond one-to-one with the auxiliary spring assembly. The limiting cover plates are connected to the support plate to form a space for restricting the vertical movement of the side beam body.

5. The bogie frame according to claim 4, characterized in that, The support plate is provided with a positioning pin, the side beam body is provided with a waist hole for the positioning pin to pass through, the limiting cover plate is provided with a through hole for the positioning pin to pass through, and the lower end face of the spring part is provided with a positioning hole for cooperating with the wheelset axle box.

6. The steering frame according to claim 3, characterized in that, The main body of the side beam is formed by three-dimensional weaving of variable cross-section carbon fiber bundles; The π-shaped positioning arm assembly is made of three-dimensional integral weaving of carbon fiber bundles and manufactured using an improved resin transfer molding injection process.

7. The bogie frame according to claim 1, characterized in that, The beam mechanism includes a beam body and the mounting position, which is integrated into the beam body.

8. The bogie frame according to claim 7, characterized in that, The mounting positions include a vertical damper mounting base, a spring mounting base, a brake base, a gearbox hanger, a lateral stop base, a motor mounting base, an anti-roll mounting base, and a lateral damper mounting base; The motor mounting base includes a first motor mounting base and a second motor mounting base. Both the first motor mounting base and the second motor mounting base are T-shaped structures and are made of elastic leaf springs. The thickness of both the first motor mounting base and the second motor mounting base gradually decreases from the middle to both ends.

9. The bogie frame according to claim 8, characterized in that, It also includes a traction pin and a traction seat. The traction pin is located at the center of the main body of the crossbeam. The traction seat is press-fitted to the traction pin through a rubber sleeve. The transverse damper mounting seat is located on the traction seat.

10. The bogie frame according to claim 8, characterized in that, The air spring mounting base is provided with a clamping bolt mounting hole, an air spring pin hole and a center positioning hole, and a mounting sleeve is provided in the clamping bolt mounting hole; The mounting sleeve includes a sleeve body and a first anti-rotation part and a second anti-rotation part respectively disposed on both sides of the sleeve body.

11. The bogie frame according to claim 8, characterized in that, A first rubber pad is provided between the main body of the crossbeam and the main body of the side beam, and a second rubber pad is provided between the main body of the side beam and the π-shaped positioning arm assembly.

12. A rail vehicle, characterized in that, Includes the bogie frame as described in any one of claims 1-11.

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