Damping spring and bogie primary spring suspension device

Abstract

Provided in the embodiments of the present application are a damping spring and a bogie primary spring suspension device. The damping spring comprises an upper spring seat component and a lower spring seat component; and a rubber spring body and an air spring body, the upper ends and the lower ends of the rubber spring body and the air spring body respectively being fixed to the upper spring seat component and the lower spring seat component. The air spring body is provided with an air bag, the rubber spring body being arranged in the air bag, and the air bag having an air path leading to the outside. The damping spring can provide in a narrow space the vertical stiffness of a primary spring, and separate the requirements of a bogie for different vertical stiffness parameters of the primary spring in a straight-track condition or a curved-track condition. In curving operation, air is supplied to an air spring body in a damping spring at an outer side, so as to improve the overall vertical stiffness of the damping spring at the outer side, thereby improving the anti-rolling capability of a bogie primary suspension‌.

Description

Damping spring and bogie primary spring suspension device Technical Field

[0001] The present application relates to the technical field of rail vehicle bogies, and in particular to a damping spring and a primary spring suspension device of a bogie. Background Art

[0002] With the adoption of green, safe, and environmentally friendly concepts in railway vehicles, vehicle design companies are demanding lightweight bogies to reduce overall vehicle weight. The lightweight advantages of built-in axlebox bogies have once again caught the attention of engineers. Due to the reduced primary spring support span of built-in axlebox bogies, the primary spring stiffness must be increased by a multiple of the half-span ratio while maintaining the same primary anti-roll capability, thereby increasing the amount of vibration transmitted from the wheelset axlebox assembly to the frame. Due to the reduced primary lateral span of built-in axlebox bogies, cylindrical steel springs cannot be arranged in a smaller space due to structural limitations. Summary of the Invention

[0003] The embodiment of the present application provides a damping spring to solve the problem that the anti-rolling capability provided by the existing springs under curve conditions cannot meet the requirements. A second object of the present application is to provide a bogie including the above-mentioned damping spring.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A damping spring comprising:

[0006] an upper spring seat assembly and a lower spring seat assembly;

[0007] A rubber spring body and an air spring body, wherein the upper and lower ends of the rubber spring body and the air spring body are respectively fixed to the upper spring seat assembly and the lower spring seat assembly; the air spring body has an air bag; the rubber spring body is located in the air bag; and the air bag has an air path communicating with the outside world.

[0008] Optionally, the upper and lower ends of the air spring body are opened;

[0009] The upper spring seat assembly comprises:

[0010] An upper gland, the bottom end of which is fixed to the rubber spring body and the top end of which is connected to the opening of the air spring body;

[0011] The upper spring seat is located above the upper pressure cover, and the air spring body is located between the upper pressure cover and the upper spring seat. The upper spring seat and the upper pressure cover are detachably fixedly connected and fix and seal the air spring body.

[0012] Optionally, the lower spring seat assembly includes:

[0013] A lower gland, the top end of which is fixed to the rubber spring body and the bottom end of which is connected to the opening of the air spring body;

[0014] The lower spring seat is located below the lower pressure cover, and the air spring body is located between the lower pressure cover and the lower spring seat. The lower spring seat and the lower pressure cover are detachably fixedly connected, and fix and seal the air spring body.

[0015] Optionally, the rubber spring body has a hollow inner cavity;

[0016] The air path passes through the upper spring seat, the upper pressure cover and the hollow inner cavity from top to bottom to the lower pressure cover, and radially passes through the outer wall of the lower pressure cover to communicate with the air bag.

[0017] Optionally, the upper spring seat includes an upper plate body and an upper truncated cone portion, wherein the upper truncated cone portion is located on the lower surface of the upper plate body, and the outer diameter of the upper truncated cone portion decreases in a direction away from the upper plate body;

[0018] An upper clamping groove is provided on the upper surface of the upper plate body, and a circumferential edge of the upper end opening of the air spring body is located in the upper clamping groove.

[0019] Optionally, the lower spring seat includes a lower plate body and a lower conical portion, the lower conical portion is located on the upper surface of the lower plate body, and the outer diameter of the lower conical portion decreases in a direction away from the lower plate body;

[0020] A lower clamping groove is provided on the lower surface of the lower plate body, and a circumferential edge of the lower end opening of the air spring body is located in the lower clamping groove.

[0021] Optionally, the upper and lower ends of the rubber spring body are opened;

[0022] The upper end opening of the rubber spring body is sleeved on the circumferential outer wall of the upper truncated cone portion;

[0023] The lower end opening of the rubber spring body is sleeved on the circumferential outer wall of the lower truncated cone portion; the rubber spring body is bonded and fixed to the upper truncated cone portion and the lower truncated cone portion respectively.

[0024] Optionally, the upper spring seat has a support portion extending downward, and a side of the support portion facing the air spring body has a curved surface, and the air spring body is in contact with the curved surface.

[0025] Optionally, the upper pressure cover and the upper spring seat, and the lower pressure cover and the lower spring seat are fixed by fastening screws respectively.

[0026] A damping spring provided in an embodiment of the present application includes: an upper spring seat assembly and a lower spring seat assembly; a rubber spring body and an air spring body, wherein the upper and lower ends of the rubber spring body and the air spring body are respectively fixed to the upper spring seat assembly and the lower spring seat assembly, and the air spring body has an air bag, the rubber spring body is located in the air bag, and the air bag has an air path connected to the outside world.

[0027] Compared with the prior art, the damping spring provided in the embodiment of the present application has the following technical effects:

[0028] A rubber spring body and an air spring body are disposed between the upper and lower spring seat assemblies. The air spring body is sheathed on the outside of the rubber spring body and includes an airbag within which the rubber spring body resides. The airbag has an air path connecting it to the outside. This damping spring provides the vertical stiffness of the primary spring in a confined space, enabling the separation of the bogie's requirements for different vertical stiffness parameters for the primary spring under straight and curved conditions. During curved operation, the air supply to the air spring body in the outer damping spring is controlled to increase the overall vertical stiffness of the outer damping spring, thereby enhancing the vehicle bogie's primary system's anti-roll capability.

[0029] In order to achieve the above-mentioned second purpose, the present application also provides a bogie primary spring suspension device, including a frame and a wheelset, the wheelset is located below the frame, the wheelset includes an axle, wheels symmetrically arranged on the axle and a built-in axle box; and the damping spring of any one of the above-mentioned embodiments, a group of damping springs is provided between each built-in axle box and the frame, the lower spring seat of the damping spring is fixed to the axle box via a locating pin, and the upper spring seat of the damping spring is fixed to the frame via a locating pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0031] FIG1 is a schematic cross-sectional view of a damping spring according to an embodiment of the present application;

[0032] FIG2 is a diagram showing the working principle of the primary spring suspension device of the bogie provided in an embodiment of the present application.

[0033] The following are marked in the accompanying drawings:

[0034] Upper spring seat assembly 10, lower spring seat assembly 20, rubber spring body 30, air spring body 40, air circuit 50, fastening screw 60, air bag 70;

[0035] Upper gland 11, upper spring seat 12, upper plate body 121, upper truncated cone 122, support portion 123;

[0036] Lower pressure cover 21, lower spring seat 22, lower plate body 221, lower truncated cone 222;

[0037] Displacement sensor 100 , air supply and exhaust unit 200 , and controller 300 . DETAILED DESCRIPTION

[0038] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0039] The embodiment of the present invention discloses a damping spring to solve the problem that the anti-rolling capability provided by the existing spring under the condition of passing through a curve cannot meet the requirements.

[0040] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0041] Please refer to Figures 1-2, Figure 1 is a schematic cross-sectional structure diagram of a damping spring provided in an embodiment of the present application; Figure 2 is a working principle diagram of the primary spring suspension device of the bogie provided in an embodiment of the present application.

[0042] In a specific embodiment, the damping spring provided herein is used as a primary spring in a bogie. It is understood that in other embodiments, the damping spring can also be used as a secondary spring, a secondary lateral stop, or a secondary longitudinal stop, or other components requiring nonlinearity or stiffness in the design of rubber components. The damping spring includes an upper spring seat 12 assembly 10, a lower spring seat 22 assembly 20, a rubber spring body 30, and an air spring body 40. The upper spring seat 12 assembly 10 is fixed to the frame, and the lower spring seat 22 is fixed to the axle box to transmit vertical loads from the frame. The upper and lower ends of the air spring body 40 are open structures with a cavity structure in the middle, and the upper and lower ends of the air spring body 40 are respectively connected to the upper spring seat 12 component 10 and the lower spring seat 22 component 20 and sealed to form an airbag 70. The airbag 70 has an air path 50 connected to the outside world so that air can be inflated into the airbag 70 to increase the vertical stiffness of the damping spring; the rubber spring body 30 is located in the airbag 70, and the upper and lower ends of the rubber spring body 30 are respectively connected to the upper spring seat 12 component 10 and the lower spring seat 22 component 20. The connection method can be set with reference to the air spring body 40.

[0043] When it is applied to a bogie with an internal axle box, the rubber spring body 30 and the air spring body 40 jointly bear the bogie spring load and the vehicle body load. When carrying the load, the outer air spring body 40 is in a pressurized state, ensuring the normal load-bearing of the bogie's primary suspension device; after using a damping spring in the place of the bogie's primary rubber spring, the vehicle's straight-line running and curve passing performance can be separated, in this case, the vertical stiffness of the primary suspension spring can be reduced.

[0044] Compared with the prior art, the damping spring provided in the embodiment of the present application has the following technical effects:

[0045] A rubber spring body 30 and an air spring body 40 are disposed between the upper spring seat 12 assembly 10 and the lower spring seat 22 assembly 20. The air spring body 40 is mounted on the outside of the rubber spring body 30 and includes an airbag 70. The rubber spring body 30 is located within the airbag 70, and the airbag 70 has an air path 50 communicating with the outside. These damping springs can provide the vertical stiffness of the primary spring in a confined space, enabling the separation of the different vertical stiffness parameters required by the bogie for the primary spring under straight and curved conditions. During curved operation, by controlling the air supply to the air spring body 40 in the outer damping spring, the overall vertical stiffness of the outer damping spring is increased, thereby enhancing the anti-roll capability of the vehicle bogie's primary spring.

[0046] Specifically, the upper and lower ends of the air spring body 40 are opened, and the air spring body 40 is a thin-walled structure, preferably a rubber structure; the airbag 70 can be spherical or cylindrical, and can also be set as a model air bag 70 or a bag-type air bag 70 as needed, or it can be a plurality of airbags 70 with hoops, which can be set according to the development level of the existing technology.

[0047] In some embodiments, the upper spring group assembly includes an upper pressure cover 11 and an upper spring seat 12, wherein the bottom end of the upper pressure cover 11 is fixed to the rubber spring body 30, the top end of the upper pressure cover 11 is connected to the opening of the air spring body 40, the upper spring seat 12 is located above the upper pressure cover 11, and the air spring body 40 is located between the upper pressure cover 11 and the upper spring seat 12 for crimping and fixing, and the upper opening of the airbag 70 of the air spring body 40 is sealed; preferably, the upper spring seat 12 and the upper pressure cover 11 are detachably fixedly connected to facilitate disassembly and assembly.

[0048] At the same time, the lower spring seat 22 assembly 20 includes a lower cover 21 and a lower spring seat 22. The top of the lower cover 21 is fixed to the top of the rubber spring body 30, and the bottom of the lower cover 21 is connected to the opening of the air spring body 40. The lower spring seat 22 is located below the lower cover 21. The air spring body 40 is located between the lower cover 21 and the lower spring seat 22 for crimping and fixing, thereby sealing the bottom opening of the air bag 70 of the air spring body 40. The lower spring seat 22 and the lower cover 21 are detachably fixed to facilitate disassembly and assembly. Generally, the upper cover 11 and the lower cover 21 are located in the air bag 70 of the air spring body 40 and are used to block the top opening and bottom opening of the air spring body 40. Preferably, the upper cover 11 and the upper spring seat 12, and the lower cover 21 and the lower spring seat 22 are respectively fixed by fastening screws 60 to ensure airtightness between the air bag 70 and the lower cover 21, and between the air bag 70 and the upper cover 11. The lower spring seat 22 is a rotating part as a whole, which is connected to the built-in axle box through a positioning surface and a positioning pin. Preferably, a positioning pin hole is provided on the base to prevent rotation between the damping spring and the built-in axle box.

[0049] In this embodiment, the rubber spring body 30 has a hollow inner cavity; the air path 50 passes through the upper spring seat 12, the upper pressure cover 11 and the hollow inner cavity to the lower pressure cover 21 from top to bottom, and radially passes through the outer wall of the lower pressure cover 21 to communicate with the airbag 70; it can be understood that the upper spring seat 12 and the upper pressure cover 11 are provided with a through hole forming the air path 50, and the through hole is preferably arranged along the vertical center line of the upper spring seat 12 and the upper pressure cover 11. After passing through the upper spring seat 12 and the upper pressure cover 11, the air path 50 reaches the hollow inner cavity of the rubber spring body 30, and continues to downwardly pass through the lower pressure cover 21 vertically for a certain vertical distance, and then passes through the outer wall of the lower pressure cover 21 radially along the lower pressure cover 21 to communicate with the airbag 70 to inflate the airbag 70.

[0050] It is understandable that in order to better inflate the airbag 70 , the air paths 50 on the lower gland 21 may be provided in a plurality of ways and radially arranged on the lower gland 21 .

[0051] In order to better fix the air spring body 40, the upper spring seat 12 includes an upper plate body 121 and an upper conical portion 122. The upper conical portion 122 is located on the lower surface of the upper plate body 121. The outer diameter of the upper conical portion 122 decreases in the direction away from the upper plate body 121. The upper conical portion 122 forms a partial core shaft to improve the vertical stiffness of the device. The upper plate body 121 and the upper conical portion 122 are arranged as one piece. The upper surface of the upper plate body 121 is provided with an upper clamping groove. The circumferential edge of the upper end opening of the air spring body 40 is located in the upper clamping groove to limit the air spring body 40 and achieve pre-fixation.

[0052] Similarly, the lower spring seat 22 includes a lower plate body 221 and a lower conical portion 222. The lower conical portion 222 is located on the upper surface of the lower plate body 221. The outer diameter of the lower conical portion 222 decreases in the direction away from the lower plate body 221. The lower conical portion 222 also forms a partial core shaft, further improving the vertical stiffness of the device. The lower plate body 221 and the lower conical portion 222 are arranged as a whole. The lower surface of the lower plate body 221 is provided with a lower groove. The circumferential edge of the lower end opening of the air spring body 40 is located in the lower groove to limit the air spring body 40 and achieve pre-fixation.

[0053] Furthermore, the upper and lower ends of the rubber spring body 30 are set as openings; the upper end opening of the rubber spring body 30 is fitted on the circumferential outer wall of the upper conical portion 122; the lower end opening of the rubber spring body 30 is fitted on the circumferential outer wall of the lower conical portion 222; a vertical distance is provided between the upper conical portion 122 and the lower conical portion 222, and the lower surface of the upper conical portion 122, the upper surface of the lower conical portion 222 and the circumferential outer wall of the rubber spring body 30 form a buffer cavity; the rubber spring body 30 is bonded and fixed to the upper conical portion 122 and the lower conical portion 222 respectively.

[0054] In some embodiments, the upper spring seat 12 has a support portion 123 extending downward. It can be understood that the upper spring seat 12 as a whole is a rotating feature part, and the support portion 123 has an arc-shaped surface on the side facing the air spring body 40, and the air spring body 40 is in contact with the arc-shaped surface; the distance between the arc-shaped surface and the vertical center line of the upper spring seat 12 increases from top to bottom, and the arc-shaped surface is in contact with the air spring body 40 to constrain and protect the upper part of the airbag 70, preventing dust and particulate matter from damaging or scratching the airbag 70.

[0055] Specifically, the load transfer path is: vertical load from the frame → upper spring seat 12 → upper pressure cover 11 → rubber → lower pressure plate → lower spring seat 22; another load-bearing route is parallel to the rubber load-bearing route, and the path is: vertical load from the frame → upper spring seat 12 assembly 10 → airbag 70 → lower spring seat 22 assembly 20.

[0056] The present application also provides a bogie primary spring suspension device, comprising a frame, a wheelset and any one of the damping springs in the above-mentioned embodiments, a group of damping springs is provided between each built-in axle box and the frame, the lower spring seat 22 of the damping spring is fixed to the axle box via a locating pin, and the upper spring seat 12 of the damping spring is fixed to the frame via a locating pin.

[0057] To achieve automatic control, the bogie primary spring suspension system further includes a displacement sensor 100, an air supply and exhaust unit 200, and a controller 300. The displacement sensors 100 are arranged in pairs, connected to the damping springs at both ends of the axle. Each damping spring is equipped with a corresponding displacement sensor 100. The air supply and exhaust unit 200 is connected to the damping spring's air path 50 and is used to inflate and deflate the damping spring's airbag 70. The controller 300 is connected to the displacement sensor 100 and the air supply and exhaust unit 200, respectively, and controls the operation of the air supply and exhaust unit 200 based on the height difference between the damping springs detected by the displacement sensor 100. In other embodiments, the displacement sensor 100 can also be configured as a height valve, with one side inflated and the other side deflated by controlling the left and right suspension heights, thereby providing the required primary anti-roll capability for the internal axle box bogie under curved conditions.

[0058] The specific operation process is as follows: when the rail vehicle is running in a straight line, the load is borne by the left and right primary suspension damping springs. During operation, since the vehicle body does not have a large rolling movement, the loads of the left and right damping springs are basically the same, the basic heights of the displacement sensors 100 on both sides remain unchanged, and the air springs in the damping springs are not filled or exhausted; when the vehicle is on a curved line (the right suspension is located on the outer rail side), the vehicle body rolls outward, resulting in an increase in the load of the damping spring on the right side of the primary suspension. When the original vertical stiffness remains unchanged, the height of the damping spring decreases, and the reduced displacement is the same as the increased displacement of the damping springs on the left and right suspensions. The controller 300 inflates the air spring on the damping spring on the right side according to the displacement difference generated by the displacement sensors 100 on both sides, thereby increasing the vertical stiffness of the composite spring and improving the anti-rolling ability of the primary suspension device of the bogie.

[0059] This configuration reduces the primary suspension's vertical stiffness during straight-line operation, improving stability and comfort, often due to the vehicle's high vertical stiffness, without compromising safety. During curves, active or semi-active control is used to supply air to the outer damping springs, increasing the combined vertical stiffness of the outer composite springs and boosting the vehicle's bogie's primary suspension's roll resistance.

[0060] In the description of this application, it should be understood that the terms "front", "rear", "head", "tail", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In this application, unless otherwise specified or limited, terms such as "mounted" and "connected" should be understood broadly. For example, "connected" can refer to direct connection or indirect connection through an intermediate medium, and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0063] Although some optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including some optional embodiments and all changes and modifications that fall within the scope of the present application.

[0064] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A damping spring, characterized in that, Comprising: An upper spring seat assembly and a lower spring seat assembly; A rubber spring body and a pneumatic spring body, the upper and lower ends of the rubber spring body and the pneumatic spring body are respectively fixed to the upper spring seat assembly and the lower spring seat assembly, the pneumatic spring body has an airbag, the rubber spring body is located in the airbag, and the airbag has an air passage communicating with the outside.

2. The damping spring according to claim 1, wherein The upper and lower ends of the pneumatic spring body are open; The upper spring seat assembly includes: An upper pressing cover, the bottom end of which is fixed to the rubber spring body and the top end of which is connected to the opening of the pneumatic spring body; An upper spring seat, located above the upper pressing cover, the pneumatic spring body is located between the upper pressing cover and the upper spring seat, and the upper spring seat and the upper pressing cover are detachably and fixedly connected and fix and seal the pneumatic spring body.

3. The damping spring according to claim 2, characterized in that, The lower spring seat assembly includes: A lower pressing cover, the top end of which is fixed to the rubber spring body and the bottom end of which is connected to the opening of the pneumatic spring body; A lower spring seat, located below the lower pressing cover, the pneumatic spring body is located between the lower pressing cover and the lower spring seat, and the lower spring seat and the lower pressing cover are detachably and fixedly connected and fix and seal the pneumatic spring body.

4. The damping spring according to claim 3, characterized in that, The rubber spring body has a hollow inner cavity; The air passage sequentially penetrates through the upper spring seat, the upper pressing cover and the hollow inner cavity to the lower pressing cover from top to bottom, and radially penetrates through the outer wall of the lower pressing cover to communicate with the airbag.

5. The damping spring according to claim 1, characterized in that, The upper spring seat includes an upper plate body portion and an upper frustum portion, the upper frustum portion is located on the lower surface of the upper plate body portion, and in the direction away from the upper plate body portion, the outer diameter of the upper frustum portion decreases; An upper card slot is provided on the upper surface of the upper plate body portion, and the circumferential edge of the upper end opening of the pneumatic spring body is located in the upper card slot.

6. The damping spring according to claim 5, wherein The lower spring seat includes a lower plate body portion and a lower frustum portion, the lower frustum portion is located on the upper surface of the lower plate body portion, and in the direction away from the lower plate body portion, the outer diameter of the lower frustum portion decreases; A lower card slot is provided on the lower surface of the lower plate body portion, and the circumferential edge of the lower end opening of the pneumatic spring body is located in the lower card slot.

7. The damping spring according to claim 6, wherein The upper and lower ends of the rubber spring body are open; The upper end opening of the rubber spring body is sleeved on the outer circumferential wall of the upper frustum portion; The lower end opening of the rubber spring body is sleeved on the outer circumferential wall of the lower frustum portion; the rubber spring body is adhesively fixed to the upper frustum portion and the lower frustum portion respectively.

8. The damping spring according to claim 1, characterized in that, The upper spring seat has a supporting portion extending downward, and the side of the supporting portion facing the pneumatic spring body has an arc surface, and the pneumatic spring body is attached to the arc surface.

9. The damping spring according to claim 1, wherein, The upper pressing cover and the upper spring seat, and the lower pressing cover and the lower spring seat are respectively fixed by fastening screws.

10. A primary spring suspension device for a bogie, characterized in that, Comprising: A frame and a wheel set, the wheel set is located below the frame, and the wheel set includes an axle, wheels symmetrically arranged on the axle and an inner axle box; And the damping spring according to any one of claims 1-9, a set of the damping springs is provided between each inner axle box and the frame, the lower spring seat of the damping spring is fixed to the axle box by a positioning pin, and the upper spring seat of the damping spring is fixed to the frame by a positioning pin.

11. The primary suspension device of the bogie according to claim 10, characterized in that, Further comprising: Displacement sensors, arranged in pairs, are respectively connected to the damping springs at both ends of the axle; An air supply and exhaust unit is connected to the air circuit of the damping spring; A controller is respectively connected to the displacement sensor and the air supply and exhaust unit to control the operation of the air supply and exhaust unit according to the height difference between the damping springs detected by the displacement sensor.

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