CN117565915A - Primary suspension structure for railway vehicle - Google Patents

Primary suspension structure for railway vehicle Download PDF

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Publication number
CN117565915A
CN117565915A CN202311539368.0A CN202311539368A CN117565915A CN 117565915 A CN117565915 A CN 117565915A CN 202311539368 A CN202311539368 A CN 202311539368A CN 117565915 A CN117565915 A CN 117565915A
Authority
CN
China
Prior art keywords
spring
cover plate
upper cover
pad
spacing ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311539368.0A
Other languages
Chinese (zh)
Inventor
宋志强
初艳
王瑞亮
山丽
李春波
于跃
叶伦
崔欢
张吉悦
陈博文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CRRC Dalian Co Ltd
Original Assignee
CRRC Dalian Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CRRC Dalian Co Ltd filed Critical CRRC Dalian Co Ltd
Priority to CN202311539368.0A priority Critical patent/CN117565915A/en
Publication of CN117565915A publication Critical patent/CN117565915A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
    • B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
    • B61F5/301—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating metal springs
    • B61F5/302—Leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
    • B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
    • B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
    • B61F5/305—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating rubber springs

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention relates to a primary suspension structure for a railway vehicle, which comprises a steel spring module; the steel spring module comprises a first spring and a second spring; the lower spacing ring structure comprises a lower cover plate and a spacing ring fixed on the lower cover plate; a vibration reduction pad module is arranged below the lower spacing ring structure; the damping pad module comprises a metal mandrel and is used for fixing a first spring and a second spring in the steel spring module; the vibration damping pad is made of rubber; the metal core shaft comprises a base arranged below the spacing ring and integrally connected with the base; the metal mandrel is internally provided with threads, the base is made of steel plates, and the base and the vibration reduction pad are vulcanized; a hollow stop arranged in the middle of the upper cover plate; a round hole is arranged in the middle of the upper cover plate and communicated with the hollow stop; locating pins are symmetrically arranged on the upper cover plate close to the outer edge; the locating pin is in interference fit with the upper cover plate; the elastic stop is connected with the metal core shaft through a bolt. The invention ensures the service life of the parts and realizes zero abrasion of main parts.

Description

Primary suspension structure for railway vehicle
Technical Field
The invention belongs to the field of full-automatic products, and relates to a primary suspension structure for a railway vehicle.
Background
In order to meet the high speed operation of rail vehicles, bogie structural design and performance must be improved. The bogie adopts a pivoted axle box positioning structure, and the primary suspension system adopts a structure of a steel spring and a damping pad. The working state of the primary suspension system can ensure the stability and the stability of the high-speed running of the vehicle, so that the structural design and the use stability of the primary suspension system must be emphasized.
A primary suspension system of the conventional round steel spring matched with the rotary arm node is shown in fig. 1, and the structure of the primary suspension system consists of a rigid stop, a steel spring, a damping pad and the like. The spring and the damping pad in the structure are positioned through the spring clamping seat, the damping pad is formed by welding steel plates and vulcanizing rubber, and threads are machined on the spring clamping seat, so that spring pre-loading is realized, and the pre-loading tool is called.
Disadvantages of the prior art
(1) The positioning device is absent between the framework and the primary suspension, and the steel spring only can provide vertical rigidity, so that rubber joints are required to be equipped to provide transverse and longitudinal positioning rigidity, and meanwhile, a vibration reduction pad and a primary vertical vibration damper are required to be installed in a matched mode, so that damping is increased, vibration and noise are reduced, and the dynamic stress of the steel spring is reduced. However, the designed transverse rigidity and the designed longitudinal rigidity cannot ensure to fully play the roles of the vehicle when the vehicle runs, and the dynamic performance of the vehicle is directly affected.
(2) When the vehicle runs at a high speed, the primary suspension can generate larger displacement, and under the limit condition, contact can occur between the steel spring and the spacer ring of the vibration damping pad, between the vibration damping pad and the axle box body, between the vibration damping pad and the spring clamping seat, and between the spring clamping seat and the axle box body, and serious abrasion can be generated due to long-time contact, so that the service life of parts is reduced, and the maintenance cost is increased.
(3) The spacer ring arranged on the vibration reduction pad is easy to damage after long-term contact abrasion, and the driving safety is affected.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme: a primary suspension structure for a railway vehicle comprises a steel spring module;
the steel spring module comprises a first spring and a second spring; the diameter of the first spring is larger than that of the second spring;
the second spring is arranged inside the first spring;
a lower spacing ring structure is arranged below the first spring and the second spring to separate the first spring from the second spring;
the lower spacing ring structure comprises a lower cover plate and a spacing ring fixed on the lower cover plate;
a vibration reduction pad module is arranged below the lower spacing ring structure;
the damping pad module comprises a metal mandrel and is used for fixing a first spring and a second spring in the steel spring module;
the vibration damping pad is made of rubber;
the metal core shaft comprises a base arranged below the spacing ring and integrally connected with the base; the metal mandrel is internally provided with threads, the base is made of a steel plate, and the base and the vibration reduction pad are vulcanized;
an axle box body is arranged below the vibration reduction pad;
an elastic stop is arranged above the first spring and the second spring to separate and position the first spring and the second spring;
the elastic stop comprises an upper cover plate arranged on the first spring and the second spring, and a hollow stop arranged in the middle of the upper cover plate; a round hole is formed in the middle of the upper cover plate and communicated with the hollow stop; locating pins are symmetrically arranged on the upper cover plate close to the outer edge; the locating pin is in interference fit with the upper cover plate; the elastic stop is connected with the metal core shaft through a bolt.
Further: the hollow stop is made of rubber.
Further: and a U-shaped adjusting pad is arranged between the lower part of the vibration reduction pad and the axle box body.
Further: a wear-resistant sleeve is embedded in the center of the metal mandrel; and then the positioning function is realized with a boss in the center of the axle box body, and transverse rigidity is provided between the lower cover plate of the damping pad and the mandrel by the damping pad.
Further: the spacer ring adopts a groove welding mode.
The primary suspension structure for the railway vehicle provided by the invention comprises a multifunctional vibration damping pad, and can realize a primary vibration damping function, a primary pre-loading function, a primary positioning function, a function of isolating inner and outer ring springs and the like, and the vibration damping pad has a simple structure and high space utilization rate, and improves the reliability of the whole primary suspension device.
(1) The invention provides a positioning device, namely a metal mandrel, between the framework and the primary suspension. The method can ensure the verticality of the steel spring during assembly and ensure the higher transverse and longitudinal rigidity of the primary suspension when the vehicle runs at high speed, so that the vehicle has higher critical speed. When the weighing test needs to be padded, the pre-loading tool can be more easily installed in place, and the working difficulty of padded adjustment is reduced.
(2) The invention sets the second-order vertical rigidity, and ensures that the vehicle has proper vertical rigidity and vibration frequency when running. The elastic stop is arranged in the second-order vertical stiffness structure, so that after the steel spring fails, the floor surface height cannot be greatly influenced, and the comfort of the vehicle is ensured.
(3) According to the invention, the welding structure of the spacer ring on the upper cover plate of the vibration reduction pad is optimized, groove welding is adopted when the spacer ring is welded with the upper cover plate, so that the welding strength of the spacer ring is improved, the quality of the spacer ring is ensured within the allowable range of the welding strength, and the situation that a welding seam is cracked to cause falling is avoided.
(4) The invention avoids the abrasion of each part of the primary suspension, ensures the service life of the parts and realizes the positioning function without abrasion.
(5) The invention reduces the number of parts hung in the first system, reduces the cost of purchasing and producing the parts, and reduces the working hours of workshop installation.
The invention has the following advantages:
(1) The invention designs a brand new multifunctional vibration damping pad integrated module, which is used for assembling a vibration damping pad, a steel spring and an elastic stop by technical requirements, and integrating the vibration damping pad and a spring clamping seat in the original scheme into one part. The cost of producing and assembling the parts is saved under the condition that the same function can be realized.
(2) The damping pad is formed by welding a steel plate and vulcanizing rubber, a wear-resistant sleeve is embedded in the center of a metal mandrel, then the positioning function is realized with a boss in the center of the axle box, transverse rigidity is provided between an upper cover plate of the damping pad and the mandrel by rubber, and the elastic positioning without abrasion is realized by utilizing a special structure.
(3) The steel spring spacer ring is welded on the upper cover plate of the vibration reduction pad, and the spacer ring is welded in a groove welding mode to replace fillet welding, so that the welding seam strength of the spacer ring is ensured, and the risk caused by welding seam failure is reduced.
(4) The steel spring is provided with an elastic stop, and the elastic stop upper cover plate is assembled with two positioning pins. When the bogie falls into the shape, the locating pin and the framework mounting seat are assembled first, so that the primary suspension and the framework are positioned, the design can ensure the perpendicularity of spring installation, and the displacement of the primary suspension relative to the framework caused by insufficient friction force can be compensated when the vehicle moves dynamically, so that the primary suspension can provide sufficient transverse rigidity and longitudinal rigidity for the vehicle.
(5) The invention avoids the abrasion of each part between the suspension steel spring and the spacer ring of the vibration reduction pad, between the vibration reduction pad and the axle box body, between the vibration reduction pad and the spring clamping seat, and between the spring clamping seat and the axle box body, ensures the service life of parts and realizes the zero abrasion of main parts.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a prior art schematic;
fig. 2 is a schematic view of a longitudinal plane of the technical scheme of the present application.
In the figure: 1. axle box, 2, damping pad, 3, wear-resisting cover, 4, locating pin, 5, cavity backstop, 6, the spacer ring, 7, first spring, 8, second spring, 9, metal dabber, 10, lower apron.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other, and the present invention will be described in detail below with reference to the drawings and the embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
A primary suspension structure for a railway vehicle includes a steel spring module;
the steel spring module comprises a first spring 7 and a second spring 8; the diameter of the first spring 7 is larger than the diameter of the second spring 8;
the second spring 8 is arranged inside the first spring 7; the first spring 7 and the second spring 8 are made of stainless steel;
a lower spacing ring structure is arranged below the first spring 7 and the second spring 8 to divide the first spring 7 and the second spring 8;
a vibration reduction pad module is arranged below the lower spacing ring structure;
the lower spacing ring structure comprises a lower cover plate 10 and a spacing ring 6 fixed on the lower cover plate 10;
the damping pad module comprises a metal mandrel 9 which is used for fixing a first spring 7 and a second spring 8 in the steel spring module;
the vibration reduction pad 2 is made of rubber;
the metal mandrel 9 comprises a base arranged below the spacing ring and the metal mandrel 9 integrally connected with the base; the metal mandrel 9 is internally provided with threads, the base is made of a steel plate, and the base and the vibration reduction pad are vulcanized;
the metal mandrel 9 is internally provided with threads, and the steel spring, the multifunctional vibration reduction pad and the elastic stop can be connected together through a tool, so that a primary suspension is compressed to a working height in advance when the vehicle is assembled, and the assembly can be facilitated;
the vibration damping pad module can realize multiple functions, including a pre-loading function of a steel spring, a positioning function of the spring, a separation function of an inner ring and an outer ring of the spring and a zero abrasion function of related parts. At the same time, the multifunctional vibration-damping pad 2 can ensure that the primary suspension can provide proper rigidity.
An axle box body 1 is arranged below the vibration reduction pad;
elastic stops are arranged above the first spring 7 and the second spring 8 to separate and position the first spring 7 and the second spring 8;
the elastic stop comprises an upper cover plate arranged on the first spring 7 and the second spring 8, and a hollow stop 5 arranged in the middle of the upper cover plate; a round hole is formed in the middle of the upper cover plate and communicated with the hollow stop 5; locating pins 4 are symmetrically arranged on the upper cover plate close to the outer edge; the positioning pin 4 is in interference fit with the upper cover plate; the elastic stop is connected with the metal mandrel 9 through a bolt;
the hollow stop 5 is made of rubber.
When the vehicle is in static debugging or later maintenance, a U-shaped adjusting pad is arranged between the lower part of the vibration reduction pad and the axle box body 1; the primary suspension state of the vehicle is adjusted.
A wear-resistant sleeve 3 is embedded in the center of the metal mandrel 9; then the positioning function is realized with a boss in the center of the axle box body 1, the transverse rigidity is provided between the lower cover plate 10 of the damping pad 2 and the mandrel by rubber, and the elastic positioning without abrasion is realized by utilizing a special structure.
The positioning pin 4 and the framework are in clearance fit, and through selecting proper fit sizes, the perpendicularity of spring installation can be automatically realized after the primary suspension and the framework are assembled, the displacement of the primary suspension relative to the framework caused by insufficient friction force can be compensated when the vehicle moves dynamically, and the function and the reliability of the primary suspension in the running process of the vehicle are ensured.
When the bogie falls, the locating pin 4 and the framework mounting seat are assembled firstly, so that the primary suspension and the framework are positioned, the design can ensure the perpendicularity of spring installation, and the displacement of the primary suspension relative to the framework caused by insufficient friction force can be compensated when the vehicle moves dynamically, so that the primary suspension can provide sufficient transverse rigidity and longitudinal rigidity for the vehicle.
Furthermore, the spacer ring 6 adopts a groove welding mode to replace fillet welding, so that the welding seam strength of the spacer ring 6 is ensured, and the risk caused by welding seam failure is reduced.
The application changes the rigid stop into the elastic stop, and integrates the vibration damping pad 2 and the spring clamping seat in the existing scheme into one part on the premise of ensuring the original primary suspension function, so that the cost of part processing and assembly is reduced, the abrasion of the axle box body 1, the vibration damping pad 2 and other parts is reduced, and the maintenance cost of the vehicle is reduced.
When the primary suspension structure designed by the invention is assembled, the vibration damping pad 2, the steel spring and the elastic stop are assembled according to technical requirements to form the multifunctional vibration damping pad 2 integrated module. The primary height is compressed to a fixed height by means of a pre-loading tool, when the bogie falls, the damping pad 2 is mounted on the central boss of the axle box body 1, and the positioning pin 4 of the elastic stop is assembled on the mounting hole position corresponding to the framework. By means of the up-and-down positioning, the perpendicularity of the installation of the steel springs can be guaranteed, and the primary suspension can be guaranteed to provide enough transverse rigidity and longitudinal rigidity for the vehicle. When the vehicle falls into, and the weighing adjustment of the vehicle is carried out on the horizontal rail, an adjusting pad is added between the vibration reduction pad 2 and the axle box body 1, and the pre-loading tool is taken out after the pad addition is completed.
The primary suspension structure designed by the invention ensures that the whole suspension system can realize abrasion-free elastic positioning in the longitudinal, transverse and vertical directions when the vehicle runs at high speed, reduces the risk of primary suspension failure, improves the operational reliability of primary suspension, improves the stability and stability of vehicle running, and reduces the cost of operation and maintenance.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (5)

1. A primary suspension structure for a railway vehicle, characterized by: comprises a steel spring module;
the steel spring module comprises a first spring and a second spring; the diameter of the first spring is larger than that of the second spring;
the second spring is arranged inside the first spring;
a lower spacing ring structure is arranged below the first spring and the second spring to separate the first spring from the second spring;
the lower spacing ring structure comprises a lower cover plate and a spacing ring fixed on the lower cover plate;
a vibration reduction pad module is arranged below the lower spacing ring structure;
the damping pad module comprises a metal mandrel and is used for fixing a first spring and a second spring in the steel spring module;
the vibration damping pad is made of rubber;
the metal core shaft comprises a base arranged below the spacing ring and integrally connected with the base; the metal mandrel is internally provided with threads, the base is made of a steel plate, and the base and the vibration reduction pad are vulcanized;
an axle box body is arranged below the vibration reduction pad;
an elastic stop is arranged above the first spring and the second spring to separate and position the first spring and the second spring;
the elastic stop comprises an upper cover plate arranged on the first spring and the second spring, and a hollow stop arranged in the middle of the upper cover plate; a round hole is formed in the middle of the upper cover plate and communicated with the hollow stop; locating pins are symmetrically arranged on the upper cover plate close to the outer edge; the locating pin is in interference fit with the upper cover plate; the elastic stop is connected with the metal core shaft through a bolt.
2. A primary suspension structure for a railway vehicle as claimed in claim 1, wherein: the hollow stop is made of rubber.
3. A primary suspension structure for a railway vehicle as claimed in claim 1, wherein: and a U-shaped adjusting pad is arranged between the lower part of the vibration reduction pad and the axle box body.
4. A primary suspension structure for a railway vehicle as claimed in claim 1, wherein: a wear-resistant sleeve is embedded in the center of the metal mandrel; and then the positioning function is realized with a boss in the center of the axle box body, and transverse rigidity is provided between the lower cover plate of the damping pad and the mandrel by the damping pad.
5. A primary suspension structure for a railway vehicle as claimed in claim 1, wherein: the spacer ring adopts a groove welding mode.
CN202311539368.0A 2023-11-17 2023-11-17 Primary suspension structure for railway vehicle Pending CN117565915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311539368.0A CN117565915A (en) 2023-11-17 2023-11-17 Primary suspension structure for railway vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311539368.0A CN117565915A (en) 2023-11-17 2023-11-17 Primary suspension structure for railway vehicle

Publications (1)

Publication Number Publication Date
CN117565915A true CN117565915A (en) 2024-02-20

Family

ID=89860040

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311539368.0A Pending CN117565915A (en) 2023-11-17 2023-11-17 Primary suspension structure for railway vehicle

Country Status (1)

Country Link
CN (1) CN117565915A (en)

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