A primary suspension system and a railway vehicle

Abstract

The application discloses a primary suspension system and a railway vehicle, which comprises a framework, an axle box body arranged on the inner side of a side beam of the framework, a rubber node assembly connected between the top of the axle box body and the framework, used for providing longitudinal and transverse positioning stiffness and releasing vertical stiffness, two steel spring assemblies connected between the top of the axle box body and the framework, and the two steel spring assemblies are respectively arranged on the two sides of the rubber node assembly along the longitudinal direction, used for providing vertical stiffness, and a positioning pull rod connected between the bottom of the axle box body and the framework, used for providing longitudinal stiffness and releasing vertical stiffness and transverse stiffness. The vertical stiffness, the transverse stiffness and the longitudinal stiffness are decoupled, the stiffness in the vertical direction, the longitudinal direction and the transverse direction is respectively realized independently, the primary suspension system has sufficient wheelset axle box positioning stiffness and small vertical stiffness, the critical speed and the ride comfort of the vehicle are ensured, and the high-speed stability and the smoothness requirement of the vehicle are met.

Description

Technical Field

[0001] This invention relates to the field of primary suspension systems for rail vehicles, and more specifically, to a primary suspension system. Furthermore, this invention also relates to a rail vehicle comprising the aforementioned primary suspension system. Background Technology

[0002] The primary suspension system of the axle box-integrated bogie is located inside the frame side beam and is constrained by the drive system, resulting in a particularly compact structural space for the primary suspension system.

[0003] In one related technology, the primary suspension system uses a steel coil spring + swing arm positioning structure. However, this structure occupies too much space and cannot meet the space requirements for miniaturization of the built-in bogie. In another related technology, the primary suspension system uses rubber springs. Although this allows for installation in a small space, its vertical stiffness, longitudinal stiffness, and lateral stiffness are coupled and have strong nonlinearity, resulting in high stiffness under heavy loads.

[0004] Therefore, how to provide a suspension system that can achieve decoupling of stiffness in the vertical, longitudinal and lateral directions in a small structural space is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a primary suspension system that can achieve stiffness decoupling in the vertical, longitudinal and lateral directions in a small structural space.

[0006] Another objective of this invention is to provide a rail vehicle that includes the aforementioned primary suspension system, which can achieve stiffness decoupling of the primary suspension system in the vertical, longitudinal, and lateral directions within a small structural space.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A primary suspension system, comprising:

[0009] Framework;

[0010] The axle box body is located on the inner side of the side beam of the frame;

[0011] A rubber node assembly, connected between the top of the axle box and the frame, provides longitudinal and lateral positioning stiffness and releases vertical stiffness;

[0012] Two steel spring assemblies are connected between the top of the axle box and the frame, and the two steel spring assemblies are respectively located on both sides of the rubber node assembly along the longitudinal direction to provide vertical stiffness;

[0013] A positioning tie rod, connected between the bottom of the axle box and the frame, is used to provide longitudinal stiffness and release vertical and lateral stiffness.

[0014] Optionally, an adjusting shim is provided between the steel spring assembly and the top of the axle box;

[0015] The steel spring assembly includes an upper clamping plate, a lower clamping plate, and a steel spring connected between the upper clamping plate and the lower clamping plate. The upper clamping plate is connected to the frame and has a through hole. The upper end of the lower clamping plate has a first threaded hole for screwing in a process bolt to increase, decrease, or replace the adjusting shim by changing the vertical position of the lower clamping plate.

[0016] Optionally, the frame has a cavity, the steel spring assembly is disposed in the cavity, the top of the cavity is formed with a box-shaped structure, the top of the steel spring assembly is disposed in the box-shaped structure and abuts against the inner wall of the top of the box-shaped structure.

[0017] Optionally, the rubber node assembly includes:

[0018] A rubber joint includes a mandrel and a rubber portion disposed on the outer periphery of the mandrel, wherein the upper end of the mandrel has a tapered guide post;

[0019] A frame-side mounting base is connected to the frame and has an inner conical hole, which is engaged with the conical guide post.

[0020] The axle box side mounting seat is connected to the axle box body and to the outer periphery of the rubber part, and is provided with a positioning hole. The axle box body is provided with a positioning boss that cooperates with the positioning hole for positioning.

[0021] Optionally, the frame-side mounting base is provided with a first process unloading hole communicating with the inner conical hole, the top of the conical guide post is provided with a second threaded hole, and the rubber node assembly further includes:

[0022] The first mounting bolt passes through the first process removal hole and connects to the second threaded hole. The head of the first mounting bolt is pressed onto the frame by a gland.

[0023] The first process ejection hole is used to allow the first process ejection component to pass through during disassembly, so as to apply a vertically downward force to the top of the mandrel, thereby separating the mandrel from the frame-side mounting seat.

[0024] Optionally, there is a preset distance between the bottom of the mandrel and the top of the axle box, so that when the vertical displacement of the primary suspension system exceeds a preset value, the mandrel contacts and is limited to a certain position.

[0025] Optionally, the frame is provided with a first lifting lug, and the outer periphery of the rubber node assembly is provided with a second lifting lug, and further includes:

[0026] A lifting boom is used to connect to the first lifting lug and the second lifting lug respectively to lift the axle box body.

[0027] Optionally, the boom includes a first boom and a second boom symmetrically arranged about the rubber node assembly, wherein one of the first boom and the second boom is a fixed-length boom and the other is an adjustable-length boom.

[0028] Optionally, the positioning rod has a bent portion.

[0029] A rail vehicle comprising any of the aforementioned primary suspension systems.

[0030] The primary suspension system provided by this invention has the following beneficial effects:

[0031] The steel spring assembly provides vertical stiffness and releases lateral and longitudinal stiffness, while the rubber node assembly provides lateral and longitudinal stiffness and releases vertical stiffness. Thus, by setting up the steel spring assembly and the rubber node assembly, the vertical stiffness is decoupled from the lateral and longitudinal stiffness, respectively. In addition, the positioning tie rod provides longitudinal stiffness and releases vertical and lateral stiffness. That is, the lateral stiffness of the primary suspension system is provided by the rubber node assembly, and the longitudinal stiffness of the primary suspension system is jointly provided by the rubber node assembly and the positioning tie rod. The positioning tie rod can supplement the lack of longitudinal stiffness without participating in the lateral positioning constraint. In other words, the primary suspension system achieves decoupling of vertical, lateral and longitudinal stiffness, so that the stiffness in the vertical, longitudinal and lateral directions can be achieved independently. This satisfies the requirement that the primary suspension system has a small vertical stiffness, a large longitudinal stiffness and a moderate lateral stiffness between the vertical and longitudinal stiffness, so as to ensure sufficient wheel set axle box positioning stiffness and a small vertical stiffness, guarantee the vehicle's critical speed and ride comfort, and meet the requirements of high-speed stability and smoothness of the vehicle.

[0032] Furthermore, this primary suspension system places both the rubber node assembly and the two steel spring assemblies on top of the axle box, making the rubber node assembly a top-mounted rubber node assembly and the steel spring assembly a top-mounted steel spring assembly. This arrangement results in a compact structure and small footprint. Additionally, the top-mounted rubber node assembly and steel spring assembly facilitate operation from above the frame, particularly suitable for axle box-integrated bogies where the installation of the primary suspension system is limited by the drive system, thus improving manufacturing convenience. Moreover, the presence of two steel spring assemblies, positioned on either side of the rubber node assembly along the longitudinal direction, allows for a large vertical load-bearing capacity within a limited lateral space. The steel spring assemblies also possess linear vertical stiffness.

[0033] The rail vehicle provided by the present invention includes the aforementioned primary suspension system and has the same beneficial effects as the primary suspension system. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies 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.

[0035] Figure 1 This is a cross-sectional view of a primary suspension system provided in a specific embodiment of the present invention;

[0036] Figure 2 for Figure 1 The figure shows a cross-sectional view of the suspension system when the adjustment pad is being adjusted.

[0037] Figure 3 for Figure 1 Top view;

[0038] Figure 4 This is a cross-sectional view of the assembled rubber node assembly and adjustable length hanger.

[0039] Figure label:

[0040] 1-Frame; 11-Cavity; 111-Box-type structure; 12-First lifting lug; 2-Shaft box body; 21-Positioning boss; 3-Rubber node assembly; 31-Rubber node; 311-Mandrel; 3111-Conical guide post; 312-Rubber part; 32-Frame side mounting seat; 321-First process unloading hole; 33-Shaft box side mounting seat; 331-Second process unloading hole; 34-First mounting bolt; 35-Gap cap; 36-Second lifting lug; 37-Fastener; 4-Steel spring assembly; 41-Clamping plate; 411-Through hole; 42-Lower clamping plate; 421-First threaded hole; 43-Steel spring; 44-Process bolt; 5-Positioning tie rod; 51-Bending part; 6-Adjusting pad; 7-Vibration damping rubber; 8-Lifting rod; 9-Primary vertical vibration damper. Detailed Implementation

[0041] 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.

[0042] The core of this invention is to provide a primary suspension system that can achieve stiffness decoupling in the vertical, longitudinal, and lateral directions within a small structural space. Another core aspect of this invention is to provide a rail vehicle including the aforementioned primary suspension system, which can achieve stiffness decoupling in the vertical, longitudinal, and lateral directions within a small structural space.

[0043] Please refer to Figure 1 This invention provides a primary suspension system, including a frame 1, an axle box 2, a rubber node assembly 3, two steel spring assemblies 4, and a positioning tie rod 5. The axle box 2 is located inside the side beam of the frame 1. The rubber node assembly 3 and the two steel spring assemblies 4 are connected between the top of the axle box 2 and the frame 1. The rubber node assembly 3 provides longitudinal and lateral positioning stiffness and releases vertical stiffness. The two steel spring assemblies 4 are located on both sides of the rubber node assembly 3 and provide vertical stiffness. The positioning tie rod 5 is connected between the bottom of the axle box 2 and the frame 1. The positioning tie rod 5 provides longitudinal stiffness and releases vertical and lateral stiffness.

[0044] Understandably, the steel spring assembly 4 provides vertical stiffness and releases lateral and longitudinal stiffness, while the rubber node assembly 3 provides lateral and longitudinal stiffness and releases vertical stiffness. Thus, by setting the steel spring assembly 4 and the rubber node assembly 3, vertical stiffness is decoupled from lateral and longitudinal stiffness, respectively. In addition, the positioning tie rod 5 provides longitudinal stiffness and releases vertical and lateral stiffness. That is, the lateral stiffness of the primary suspension system is provided by the rubber node assembly 3, and the longitudinal stiffness of the primary suspension system is jointly provided by the rubber node assembly 3 and the positioning tie rod 5. The positioning tie rod 5 can supplement the lack of longitudinal stiffness without participating in the lateral positioning constraint. In other words, the primary suspension system achieves decoupling of vertical, lateral and longitudinal stiffness, so that the stiffness in the vertical, longitudinal and lateral directions can be achieved independently. This satisfies the requirement that the primary suspension system has a small vertical stiffness, a large longitudinal stiffness and a moderate lateral stiffness between the vertical and longitudinal stiffness, so as to ensure sufficient wheel set axle box positioning stiffness and a small vertical stiffness, guarantee the vehicle's critical speed and ride comfort, and meet the requirements of high-speed stability and smoothness of the vehicle.

[0045] Furthermore, in this embodiment of the invention, both the rubber node assembly 3 and the two steel spring assemblies 4 are located on the top of the axle box body 2, making the rubber node assembly 3 a top-mounted rubber node assembly 3 and the steel spring assembly 4 a top-mounted steel spring assembly 4. This arrangement results in a compact structure and small footprint. Additionally, the top-mounted rubber node assembly 3 and steel spring assembly 4 facilitate operation from above the frame 1, particularly suitable for axle box-integrated bogies where the installation of the primary suspension system is limited by the drive system, thus improving process convenience. Moreover, the presence of two steel spring assemblies 4, located on opposite sides of the rubber node assembly 3 along its longitudinal direction, enables a large vertical load-bearing capacity within a limited lateral space. Furthermore, the steel spring assembly 4 possesses linear vertical stiffness.

[0046] Additionally, please refer to Figure 1 and Figure 2To accommodate the varying working heights of the steel spring assembly 4 under different loads, in some embodiments, an adjusting shim 6 is provided between the steel spring assembly 4 and the top of the axle box 2. The steel spring assembly 4 includes an upper clamping plate 41, a lower clamping plate 42, and a steel spring 43 connected between the upper clamping plate 41 and the lower clamping plate 42. The upper clamping plate 41 is connected to the frame 1 and has a through hole 411. The upper end of the lower clamping plate 42 has a first threaded hole 421 for screwing in a process bolt 44 to increase, decrease, or replace the adjusting shim 6 by changing the vertical position of the lower clamping plate 42. In other words, this embodiment uses adjusting shims 6 of different thicknesses or in different numbers between the steel spring assembly 4 and the top of the axle box 2 to allow the steel spring assembly 4 to adapt to different loads and have different working heights. Specifically, when the adjusting shim 6 needs to be adjusted, the process bolt 44 is passed through the through hole 411 of the upper clamping plate 41 and screwed into the first threaded hole 421 at the upper end of the lower clamping plate 42. The engagement of the process bolt 44 with the first threaded hole 421 allows the lower clamping plate 42 to be lifted when the process bolt 44 is turned, thereby enabling the addition, removal, or replacement of the adjusting shim 6 within the small space. This structure allows for adjustment of the adjusting shim 6 from above the frame 1, making the adjustment of the adjusting shim 6 within the small space convenient.

[0047] For further information, please continue to refer to [link / reference]. Figure 1 and Figure 2 In some embodiments, a vibration-damping rubber 7 is provided between the adjusting pad 6 and the lower clamping plate 42. That is, in this embodiment, the vibration-damping rubber 7 is used to dampen the steel spring assembly 4, thereby improving the vertical vibration damping effect.

[0048] Please continue to refer to this. Figure 1 and Figure 2 In order to further improve the vertical vibration reduction effect, in some embodiments, a series of vertical vibration dampers 9 are provided between the frame 1 and the axle box 2.

[0049] Furthermore, the above embodiments do not limit the specific connection method between the steel spring assembly 4 and the axle box 2, as long as the connection between the steel spring assembly 4 and the axle box 2 can be achieved. In some embodiments, the lower part of the lower clamping plate 42 is provided with a limiting hole, and the top of the axle box 2 is provided with a limiting protrusion, which is connected to the limiting hole. That is, during installation, the limiting hole and the limiting protrusion are inserted to achieve the connection between the steel spring assembly 4 and the axle box 2. This connection method is simple, convenient, and easy to install.

[0050] In addition, the above embodiments do not limit the specific connection method between the steel spring assembly 4 and the frame 1, as long as the connection between the steel spring assembly 4 and the frame 1 can be achieved.

[0051] Please refer to Figure 1In some embodiments, the frame 1 has a cavity 11, and the steel spring assembly 4 is disposed within the cavity 11. A box-shaped structure 111 is formed on the top of the cavity 11, and the top of the steel spring assembly 4 is disposed within the box-shaped structure 111 and abuts against the inner wall of the top of the box-shaped structure 111. That is to say, in this embodiment, the steel spring assembly 4 is disposed within the cavity 11 of the frame 1, which is beneficial for space utilization; and by forming a box-shaped structure 111 on the top of the cavity 11, the top of the steel spring assembly 4 is constrained and limited by the box-shaped structure 111. At the same time, the top of the steel spring assembly 4 abuts against the inner wall of the top of the box-shaped structure 111, avoiding direct contact between the top of the steel spring assembly 4 and the upper cover plate of the frame 1, thereby preventing the vertical force of the steel spring assembly 4 from acting directly on the upper cover plate, thus improving the structural strength of the frame 1.

[0052] In addition, the above embodiments do not limit the specific structure of the rubber node assembly 3, as long as the rubber node assembly 3 can be connected to the frame 1 and the axle box 2 respectively.

[0053] Please refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, the rubber node assembly 3 includes a rubber node 31, a frame-side mounting base 32, and a shaft box-side mounting base 33. The rubber node 31 includes a spindle 311 and a rubber portion 312 disposed on the outer periphery of the spindle 311. The upper end of the spindle 311 has a tapered guide post 3111. The frame-side mounting base 32 is connected to the frame 1, and the frame-side mounting base 32 is provided with an inner conical hole, which is engaged with the tapered guide post 3111. The shaft box-side mounting base 33 is connected to the shaft box body 2 and is connected to the outer periphery of the rubber portion 312. The shaft box-side mounting base 33 is provided with a positioning hole, and the shaft box body 2 is provided with a positioning boss 21 that engages with the positioning hole for positioning. In other words, in this embodiment, the rubber node assembly 3 is connected to the frame 1 through the frame-side mounting seat 32 and to the axle box body 2 through the axle box-side mounting seat 33. At the same time, the frame-side mounting seat 32 is connected to the rubber node 31 through the inner conical hole and the conical guide post 3111. The axle box-side mounting seat 33 is connected to the outer periphery of the rubber part 312. In addition, during installation, the axle box-side mounting seat 33 and the axle box body 2 are quickly installed and positioned through the cooperation of the positioning hole and the positioning boss 21. At the same time, the positioning and anti-shear functions are achieved through the cooperation of the positioning boss 21 and the positioning hole.

[0054] To improve the reliability of the connection, in some embodiments, the axle box side mounting seat 33 is interference-fitted with the outer periphery of the rubber part 312; the inner conical hole is interference-fitted with the conical guide post 3111.

[0055] Additionally, please refer to Figure 1 and Figure 4To further improve the reliability of the connection and the ease of disassembly, in some embodiments, the frame-side mounting base 32 is provided with a first process removal hole 321 communicating with the inner conical hole, and the top of the tapered guide post 3111 is provided with a second threaded hole. The rubber node assembly 3 also includes a first mounting bolt 34, which passes through the first process removal hole 321 and connects with the second threaded hole. The head of the first mounting bolt 34 is pressed onto the frame 1 by a pressure cap 35. The first process removal hole 321 is used to allow the first process removal component to pass through during disassembly, so as to apply a vertically downward force to the top of the mandrel 311, causing the mandrel 311 to separate from the frame-side mounting base 32. That is to say, in this embodiment, the first mounting bolt 34 is connected to the second threaded hole, and the head of the first mounting bolt 34 is pressed onto the frame 1 by the pressure cap 35, which improves the tightness of the fit between the tapered guide post 3111 and the inner conical hole, thereby improving the reliability of the connection between the rubber node assembly 3 and the frame 1. In addition, to facilitate the disassembly of the rubber node assembly 3, this embodiment provides a first process removal hole 321 on the frame-side mounting base 32. During disassembly, the first process removal component passes through the first process removal hole 321, causing the first process removal hole 321 to abut against the top end of the mandrel 311 and apply a downward vertical force to the top end of the mandrel 311, thereby disengaging the mandrel 311 from the inner conical hole. It should be noted that this embodiment does not limit the specific structure of the first process removal hole 321 and the first process removal component. In some embodiments, the first process removal hole 321 is a threaded hole, and the first process removal component is a process removal bolt. By screwing the process removal bolt into the threaded hole, the end of the process removal bolt faces downward and pushes against the top end of the mandrel 311, thereby separating the mandrel 311 from the inner conical hole.

[0056] Furthermore, the above embodiments do not limit the connection method between the axle box side mounting base 33 and the axle box body 2, as long as the connection between the two can be achieved. Please refer to... Figure 3 In some embodiments, the axle box side mounting base 33 is connected to the axle box body 2 by fasteners 37, for example, by a second mounting bolt.

[0057] Additionally, for easier disassembly of the axle box side mounting bracket 33 and the axle box body 2, please refer to [link / reference needed]. Figure 3 In some embodiments, the axle box side mounting base 33 is provided with a second process removal hole 331 for allowing a second process removal component to pass through and push against the axle box body 2 during disassembly. Further, in some embodiments, the second process removal hole 331 is a threaded hole, and the second process removal component is a process removal bolt. It should be noted that this embodiment does not limit the specific number of second process removal holes 331; the number of second process removal holes 331 can be one or at least two.

[0058] In some embodiments, a preset distance is maintained between the bottom of the spindle 311 and the top of the axle box 2, so that when the vertical displacement of the primary suspension system exceeds a preset value, the spindle 311 contacts and is limited by the axle box 2. In other words, this embodiment limits the vertical displacement of the primary suspension system by maintaining a preset distance between the bottom of the spindle 311 and the top of the axle box 2. When the vertical displacement of the primary suspension system is less than the preset value, it indicates that the vertical displacement is normal. At this time, the preset distance between the bottom of the spindle 311 and the top of the axle box 2 allows the primary suspension system to generate the required vertical displacement. When the vertical displacement of the primary suspension system exceeds the preset value, it indicates that an abnormal vertical displacement has occurred. The bottom of the spindle 311 contacts the axle box 2, and both stop and limit the vertical displacement, preventing the primary suspension system from continuing to generate vertical displacement and causing an abnormality. That is, the space with the preset distance between the bottom of the spindle 311 and the top of the axle box 2 constitutes the vertical displacement travel space of the primary suspension system.

[0059] Additionally, please refer to Figure 4 To enable the lifting function of the wheelset, in some embodiments, the frame 1 is provided with a first lifting lug 12, and the outer periphery of the rubber node assembly 3 is provided with a second lifting lug 36. The primary suspension system also includes a suspension rod 8, which is used to connect to the first lifting lug 12 and the second lifting lug 36 respectively to lift the axle box 2. That is, this embodiment proposes to set the second lifting lug 36 on the outer periphery of the rubber node assembly 3, and indirectly realize the lifting function of the axle box 2 and the wheelset located on the axle box 2 by lifting the rubber node assembly 3 through the suspension rod 8. For the axle box built-in bogie with the axle box 2 located inside the frame 1, it is convenient to lift the axle box 2 in a small space, making the structure compact. Moreover, the rubber node assembly 3 and the two steel spring assemblies 4 are all located between the top of the axle box 2 and the frame 1, which improves the connection strength between the axle box 2 and the frame 1. Therefore, setting the second lifting lug 36 on the outer periphery of the rubber node assembly 3 can also meet the strength requirements for lifting.

[0060] Furthermore, in some embodiments, the lifting rod 8 includes a first lifting rod and a second lifting rod symmetrically arranged about the rubber node assembly 3. One of the first and second lifting rods is a fixed-length lifting rod, and the other is a length-adjustable lifting rod. For example, the first lifting rod is a fixed-length lifting rod, and the second lifting rod is a length-adjustable lifting rod. That is, in this embodiment, the length of the length-adjustable lifting rod can be adjusted to adapt to the fixed-length lifting rod, thereby ensuring smoothness during lifting and installation and avoiding the inability to install the first and second lifting rods smoothly due to installation errors. It should be noted that this embodiment does not specifically limit the length adjustment method of the length-adjustable lifting rod, as long as its length is adjustable. For example, in some embodiments, the length-adjustable lifting rod includes a first connecting rod, a second connecting rod, and a double-threaded rod that is threadedly connected to the first and second connecting rods respectively. The first connecting rod is used to connect to the first lifting lug 12, and the second connecting rod is used to connect to the second lifting lug 36. By adjusting the thread engagement length of the double-threaded rod with the first and second connecting rods respectively, the length of the length-adjustable lifting rod can be adjusted. The structure is simple and easy to implement.

[0061] Additionally, please refer to Figure 3 In some embodiments, the positioning rod 5 has a bent portion 51. That is, by giving the positioning rod 5 a bent portion 51, this embodiment avoids interference between the positioning rod 5 and other components by utilizing the bent portion 51 to avoid the installation space of other components.

[0062] In addition to the aforementioned primary suspension system, the present invention also provides a rail vehicle including the primary suspension system disclosed in the above embodiments. For the structure of other parts of the rail vehicle, please refer to the relevant technology, which will not be repeated here.

[0063] The key point of this embodiment is that the primary suspension system disclosed in any of the above embodiments has the same beneficial effects as the primary suspension system described above, and will not be repeated here.

[0064] It should also be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0065] 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.

[0066] The preceding text provides a detailed description of the primary suspension system and rail vehicle provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of these embodiments are merely illustrative of the methods and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of this invention.

Claims

1. A primary suspension system, characterized in that, include: Framework (1); Axle box body (2) is located on the inner side of the side beam of the frame (1); A rubber node assembly (3) is connected between the top of the axle box (2) and the frame (1) to provide longitudinal and lateral positioning stiffness and release vertical stiffness; Two steel spring assemblies (4) are connected between the top of the axle box (2) and the frame (1), and the two steel spring assemblies (4) are respectively located on both sides of the rubber node assembly (3) along the longitudinal direction to provide vertical stiffness; the two steel spring assemblies (4) are located above the longitudinal centerline of the axle box (2); The positioning tie rod (5) is connected between the bottom of the axle box body (2) and the frame (1) to provide longitudinal stiffness and release vertical and lateral stiffness; The connection position of the positioning rod (5) and the axle box (2) is located between the vertical center line of the axle box (2) and the longitudinal outer wall of the axle box (2), and the connection position of the positioning rod (5) and the axle box (2) is located below the vertical bottom wall of the axle box (2), and the rubber node assembly (3) is located above the vertical top wall of the axle box (2); The vertical stiffness of the primary suspension system is less than the lateral stiffness of the primary suspension system, and the lateral stiffness of the primary suspension system is less than the longitudinal stiffness of the primary suspension system. An adjusting pad (6) is provided between the steel spring assembly (4) and the top of the axle box (2). The steel spring assembly (4) includes an upper clamping plate (41), a lower clamping plate (42), and a steel spring (43) connected between the upper clamping plate (41) and the lower clamping plate (42). The upper clamping plate (41) is connected to the frame (1), and the upper clamping plate (41) is provided with a through hole (411). The upper end of the lower clamping plate (42) is provided with a first threaded hole (421). The first threaded hole (421) is used for the process bolt (44) to be screwed in, so as to increase, decrease, or replace the adjusting shim (6) by changing the vertical position of the lower clamping plate (42). The frame (1) has a cavity (11), and the steel spring assembly (4) is located in the cavity (11). A box-shaped structure (111) is formed on the top of the cavity (11). The top of the steel spring assembly (4) is located in the box-shaped structure (111) and abuts against the inner wall of the top of the box-shaped structure (111).

2. The primary suspension system according to claim 1, characterized in that, The rubber node assembly (3) includes: The rubber node (31) includes a mandrel (311) and a rubber part (312) disposed on the outer periphery of the mandrel (311). The upper end of the mandrel (311) has a tapered guide post (3111). The frame side mounting base (32) is connected to the frame (1) and is provided with an inner conical hole, which is connected to the conical guide post (3111). The axle box side mounting seat (33) is connected to the axle box body (2) and to the outer periphery of the rubber part (312), and is provided with a positioning hole. The axle box body (2) is provided with a positioning boss (21) that cooperates with the positioning hole for positioning.

3. The primary suspension system according to claim 2, characterized in that, The frame-side mounting base (32) is provided with a first process unloading hole (321) communicating with the inner conical hole, and the top of the conical guide post (3111) is provided with a second threaded hole. The rubber node assembly (3) also includes: The first mounting bolt (34) passes through the first process unloading hole (321) and connects to the second threaded hole. The head of the first mounting bolt (34) is pressed onto the frame (1) by a cap (35). The first process ejection hole (321) is used to allow the first process ejection component to pass through during disassembly, so as to apply a vertical downward force to the top end of the mandrel (311) to separate the mandrel (311) from the frame side mounting seat (32).

4. The primary suspension system according to claim 2, characterized in that, There is a preset distance between the bottom of the spindle (311) and the top of the axle box (2) so that when the vertical displacement of the primary suspension system exceeds the preset value, the spindle (311) will contact and limit the axle box (2).

5. The primary suspension system according to any one of claims 1-4, characterized in that, The frame (1) is provided with a first lifting lug (12), and the outer periphery of the rubber node assembly (3) is provided with a second lifting lug (36), and also includes: A lifting rod (8) is used to connect to the first lifting lug (12) and the second lifting lug (36) respectively to lift the axle box body (2).

6. The primary suspension system according to claim 5, characterized in that, The boom (8) includes a first boom and a second boom symmetrically arranged about the rubber node assembly (3), wherein one of the first boom and the second boom is a fixed-length boom and the other is an adjustable-length boom.

7. The primary suspension system according to any one of claims 1-4, characterized in that, The positioning rod (5) has a bent portion (51).

8. A rail vehicle, characterized in that, Includes the primary suspension system as described in any one of claims 1-7.

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