Independent double-cavity air spring

Abstract

The utility model belongs to the technical field of automobile suspensions, and relates to an independent type double-cavity air spring which comprises a base, an air bag and a piston, and the base, the air bag and the piston define a closed air containing cavity. A column cavity with a downward opening is formed in the piston, a plunger in axial sealing sliding fit with the inner side wall of the piston is arranged in the column cavity, the plunger divides the gas containing cavity into a main gas chamber and an auxiliary gas chamber which are isolated from each other, the main gas chamber is located on the lower side of the plunger, and the auxiliary gas chamber is located on the upper side of the plunger. The piston is provided with a first inflation inlet communicated with the main air chamber and a second inflation inlet communicated with the auxiliary air chamber. The upper end of the push rod is connected to the plunger, and the lower end of the push rod is connected to the base; the axis of the push rod and the axis of the piston inner column cavity are arranged in the same direction. The rigidity adjusting range of the air spring is expanded, the high-pressure air in the auxiliary air chamber provides buffering limiting for compression movement of the air spring, thrust is provided for reset movement of the air spring and a vehicle body to enable the vehicle body to reset quickly, and the driving comfort of the vehicle is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile suspension, and particularly relates to an independent double-cavity air spring. BACKGROUND

[0002] The independent air spring refers to an air spring assembled separately from a shock absorber. Compared with a strut type air spring assembled integrally with a shock absorber, the independent air spring is simple in structure and can more accurately and flexibly regulate the rigidity and load capacity thereof, and is widely used in luxury cars, business cars and other vehicle models with high comfort requirements.

[0003] The independent air spring mainly comprises a base, an air bag and a piston, the lower end of the air bag is in sealing cooperation with the base, the upper end of the air bag is in sealing cooperation with the lower end of the piston, and the base, the air bag and the piston enclose a closed air chamber. The base is connected to a wheel frame, and the piston is connected to a suspension, and the rigidity of the air spring is adjusted by inflating the air chamber in the air bag through an air pump to meet the driving requirements of the vehicle on different road conditions and improve the driving comfort of the vehicle. When the vehicle drives on a bumpy road, the body will vibrate up and down with a large amplitude relative to the wheel frame, which will cause the base and the piston of the air spring to collide rigidly after moving close to each other, thereby affecting the driving comfort of the vehicle and causing damage to the air spring. In order to avoid the above situation, the compression movement of the piston or the base of the independent air spring needs to be buffered and limited.

[0004] At present, a buffer block is mainly arranged on a suspension swing arm or a shock absorber used in cooperation with the air spring to provide further buffering and limiting for the compression movement of the air spring, but the way of integrating the buffer block in the shock absorber requires the shock absorber to be arranged as vertically as possible, which limits the arrangement angle of the shock absorber. The way of assembling the buffer block on the suspension swing arm occupies the mounting space of the suspension and is easy to affect the assembly of other components on the suspension. Therefore, the Chinese patent with the publication number CN213744653U discloses an air spring, which buffers the impact between the top surface and the bottom surface of the air spring in the up-down direction and limits the compression of the air spring by arranging a solid structure limiting buffer block in the air spring. The mounting space of the suspension is saved, and more choices are provided for the setting mode of the shock absorber, but when the vibration amplitude and the impact borne by the vehicle are too large, the top surface and the bottom surface of the air spring are close to each other and impact and extrude the limiting buffer block in the up-down direction when the body and the suspension touch the bottom, and the limiting buffer block is easy to be damaged and fail after being impacted and extruded, thereby affecting the driving comfort of the vehicle. In addition, the rigidity adjustment range of the air spring is limited. SUMMARY

[0005] The utility model wants to solve the technical problem: provide a kind of independent double cavity air spring with main air chamber and auxiliary air chamber, expand the stiffness adjustment range of air spring;By high-pressure gas in auxiliary air chamber is flushed in instead of solid structure's buffer limiting block to air spring compression limiting makes the compression buffering capacity of air spring improve, accelerates the reset of air spring and vehicle body, improves the comfort of vehicle driving.

[0006] The utility model solves the technical problem that the technical scheme is as follows: an independent double cavity air spring, including base, air bag and piston, the air bag lower end with the base seal cooperation, the air bag upper end with the piston lower end seal cooperation, the base the air bag and the piston form the closed gas cavity;

[0007] The piston is equipped with the column cavity of opening downwards, the column cavity is equipped with the plunger with the piston inner side wall axial sliding cooperation, the plunger with the piston inner side wall seal cooperation;The plunger separates the gas cavity into main air chamber and auxiliary air chamber, and the main air chamber is located in the plunger lower side, and the auxiliary air chamber is located in the plunger upper side;The piston is equipped with the first inflation port being connected with the main air chamber and the second inflation port being connected with the auxiliary air chamber;

[0008] The main air chamber is equipped with push rod, and the push rod upper end is connected on the plunger, and the push rod lower end is connected on the base;The axis of the push rod and the axis of the inner column cavity of the piston are arranged in the same direction.

[0009] Further, the lower end of the piston is provided with an axial limiting portion which protrudes inwardly from the inner side wall of the piston.

[0010] Further, the axial limiting portion is an annular plate structure coaxially arranged with the piston.

[0011] Further, the axial limiting portion and the piston are an integral structure formed integrally.

[0012] The column cavity of the piston penetrates the piston in the up-down direction, and a sealing top plate is welded to the upper part of the piston, which seals the upper port of the column cavity;The second inflation port is arranged on the sealing top plate;The lower end of the push rod is detachably connected with the base.

[0013] Further, the sealing top plate is arranged in the upper column cavity of the piston and is in sealing cooperation with the inner side wall of the piston, and the plunger is located below the sealing top plate and is arranged with a spacing therebetween.

[0014] An inflation nozzle protruding upward is sealingly connected to the second inflation port, and the upper end surface of the inflation nozzle is located below the upper end surface of the piston.

[0015] Further, the column cavity of the piston above the axial limiting part is a stepped hole structure, and the stepped surface in the column cavity abuts against the lower end surface of the sealing top plate.

[0016] Further, the plunger comprises a plunger body, and an annular groove coaxial with the plunger body is arranged on the outer side surface of the plunger body, and a first sealing ring is arranged in the annular groove, and the first sealing ring protrudes out of the annular groove and sealingly cooperates with the inner side wall of the piston.

[0017] Further, the plunger and the push rod are connected through a universal ball head.

[0018] Further, the base is provided with an axial through positioning stepped hole, and the large hole of the positioning stepped hole is located on the side close to the main gas chamber.

[0019] The lower part of the push rod is provided with a shaft ring integrally formed with the push rod, the push rod upper hoop below the shaft ring is provided with a second sealing ring, and the push rod below the second sealing ring is provided with a threaded section; the second sealing ring sealingly cooperates with the push rod;

[0020] The push rod penetrates through the positioning stepped hole, the second sealing ring sealingly cooperates with the hole wall of the large hole of the positioning stepped hole, the shaft ring axially abuts against the top surface of the base, and the threaded section protrudes downward out of the base and is connected with a fastening nut, and the upper end surface of the fastening nut closely abuts against the base.

[0021] Further, the base is provided with a downward protruding annular part, the annular part and the base form a mounting cavity with an opening downward, and the threaded section of the push rod and the fastening nut are located in the mounting cavity.

[0022] Compared with existing technologies, the advantages of this invention are as follows: It provides an independent dual-chamber air spring. A piston is placed within the piston to form an adjustable and sealed auxiliary air chamber. The air spring's own extension and contraction motion drives the piston's axial reciprocating motion, changing the volume and gas pressure within the auxiliary air chamber, thereby altering the downward pressure exerted on the piston by the high-pressure gas within the auxiliary air chamber. During the piston's upward movement, the downward pressure exerted on the piston by the high-pressure gas in the auxiliary air chamber gradually increases, providing a buffer for the air spring's compression motion and limiting its compression, preventing rigid collision between the piston and piston, improving vehicle ride comfort, and extending the air spring's service life. Conversely, during the air spring's rebound extension motion, the high-pressure gas in the auxiliary air chamber also provides thrust for the piston's downward reset motion, accelerating the air spring's rebound reset. Furthermore, the air spring of this invention has independent main and auxiliary air chambers. The initial air pressure of the two chambers can be adjusted by regulating the initial inflation volume of the main and auxiliary air chambers, thus allowing for more precise adjustment of the air spring's stiffness. An axial limiting part is provided at the lower end of the piston to axially limit the plunger, preventing the plunger from dislodging from the piston cavity, facilitating plunger installation, and improving the reliability of the air spring. The plunger and push rod are hinged by a universal ball joint, allowing the push rod to deflect at a certain angle relative to the plunger and piston to accommodate the relative horizontal displacement of the base and piston during the extension and retraction of the air spring. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the axial cross-sectional structure of this utility model;

[0024] Figure 2 yes Figure 1 Enlarged structural diagram of section A in the middle;

[0025] Figure 3 yes Figure 1 Enlarged structural diagram of section B in the middle;

[0026] Figure 4 yes Figure 1 A cross-sectional view of the central base;

[0027] Figure 5 This is a schematic diagram of the assembly structure of the plunger and push rod;

[0028] Reference numerals: 1-base; 13-annular part; 14-installation cavity; 2-airbag; 3-piston; 31-first inflation port; 32-second inflation port; 33-axial limiting part; 34-sealing top plate; 35-inflation nozzle; 41-main air chamber; 42-auxiliary air chamber; 5-plunger; 51-plunger body; 52-first sealing ring; 6-push rod; 61-shaft collar; 62-second sealing ring; 63-threaded section; 64-fastening nut. Detailed Implementation

[0029] The utility model is further illustrated below in combination with the drawings and examples. The examples described below by referring to the drawings are exemplary and are only used for explaining the utility model and cannot be understood as limiting the utility model.

[0030] As shown in the accompanying drawings Figures 1-5 A kind of independent double-cavity air spring, including pedestal 1, air bag 2 and piston 3, the lower end of the air bag 2 is sealed with the pedestal 1, the upper end of the air bag 2 is sealed with the lower end of the piston 3, the pedestal 1, the air bag 2 and the piston 3 form closed gas cavity;The piston 3 is equipped with the column cavity of opening downwards, the column cavity is equipped with the plunger 5 with the inside wall axial sliding fit of the piston 3, the plunger 5 is sealed with the inside wall of the piston 3;The plunger 5 separates the gas cavity into main gas chamber 41 and auxiliary gas chamber 42 isolated from each other, the main gas chamber 41 is located at the lower side of the plunger 5, the auxiliary gas chamber 42 is located at the upper side of the plunger 5;The piston 3 is equipped with the first inflation port 31 being communicated with the main gas chamber 41 and the second inflation port 32 being communicated with the auxiliary gas chamber 42;The main gas chamber 41 is equipped with push rod 6, the upper end of the push rod 6 is connected in the plunger 5, the lower end of the push rod 6 is connected in the pedestal 1;The axis of the push rod 6 is arranged with the axis of the column cavity in the piston 3.

[0031] The pedestal 1 of the utility model air spring is connected on wheel frame, and the piston 3 is connected on suspension. Auxiliary gas chamber 42 is filled with high-pressure gas through the second inflation port 32, and main gas chamber 41 is filled with compressed gas through the first inflation port 31. The pressure of the gas in auxiliary gas chamber 42 should be greater than the pressure of the gas in main gas chamber 41. During the driving of vehicle, the suspension drives the air spring to extend and contract, and then the pedestal 1 drives the push rod 6 and the plunger 5 to move up and down synchronously, so that the plunger 5 slides up and down in the column cavity of the piston 3 to change the volume of the auxiliary gas chamber 42. When the air spring is compressed, the pedestal 1 and the piston 3 of the air spring move towards each other. Relative to the piston 3, the pedestal 1 drives the push rod 6 and the plunger 5 to move upwards synchronously. The plunger 5 slides upwards in the column cavity to compress the volume of the auxiliary gas chamber 42. The pressure of the gas in the auxiliary gas chamber 42 gradually increases and exerts a downward reaction force on the plunger 5, which provides resistance for the compression of the whole air spring. The reaction force of the compressed gas in the auxiliary gas chamber 42 gradually increases during the upward movement of the plunger 5, until the plunger 5 is limited to stop moving upwards, and the air spring stops compression. Subsequently, the suspension resets to stretch the air spring. The pedestal 1 and the piston 3 of the air spring move away from each other. Relative to the piston 3, the pedestal 1 drives the push rod 6 and the plunger 5 to move downwards synchronously. At the same time, the high-pressure gas in the auxiliary gas chamber 42 pushes the plunger 5 to make the plunger 5 slide downwards at a higher speed. The plunger 6 pushes the push rod 6 and the pedestal 1 to move downwards at a higher speed, and then the air spring quickly rebounds to reset, and the vehicle body quickly resets at a higher speed.

[0032] The utility model discloses a piston 3 is set up in the column cavity and sets up the plunger 5 in the column cavity and encloses the auxiliary air chamber 42 of adjustable volume and airtight, utilizes the telescopic movement of air spring to drive the axial reciprocating motion of plunger 5 to change the volume of auxiliary air chamber 42 and the gas pressure in auxiliary air chamber 42, and further change the size of the pressure that high pressure gas in auxiliary air chamber 42 exerts to plunger 5 downward. The high pressure gas in auxiliary air chamber 42 exerts to plunger 5 downward pressure gradually increases in the upward motion of plunger 5, provides the buffer force for the compression movement of air spring and compresses the limit of air spring, avoids the rigid collision of plunger 5 and piston 3, improves the comfort of vehicle driving and riding, prolongs the service life of air spring, correspondingly, the high pressure gas in auxiliary air chamber 42 also provides the thrust for the downward reset motion of plunger 5 when the rebound stretch movement of air spring, accelerates the rebound reset of air spring. In addition, the air spring of the utility model has the main air chamber 41 and the auxiliary air chamber 42 of independent, can adjust the initial gas pressure of two air chambers by adjusting the initial inflation of main air chamber 41 and auxiliary air chamber 42, and further more accurately adjust the rigidity of air spring.

[0033] The base 1 is used for sealing the lower port of the air bag 2 and connecting the air spring on the wheel frame, and the base 1 can be a cylindrical structure with one end sealed or a solid columnar structure. The piston 3 is used for sealing the upper port of the air bag 2 and connecting the air spring on the vehicle suspension, and the air bag 2 is generally sleeved on the outer circumferential surface of the base 1 and the piston 3, and the air bag 2 can be sealingly connected with the base 1 and the piston 3 through hoop connection, pressure connection or the like. The main air chamber 41 is used for containing compressed gas, and the auxiliary air chamber 42 is used for containing high pressure gas, and the rigidity of the air spring can be adjusted by adjusting the gas pressure in the main air chamber 41 and the auxiliary air chamber 42.

[0034] The plunger 5 is sealingly connected with the inner wall of the piston 3 to enclose the auxiliary air chamber 42, and the volume of the auxiliary air chamber 42 and the gas pressure in the auxiliary air chamber 42 are adjusted by the up-down sliding of the plunger 5. When the stretch movement stroke of the air spring is too large, the plunger 5 is easily slid out of the lower port of the piston 3 and cannot be reset, resulting in air spring failure. Preferably, the lower end of the piston 3 is provided with an axial limiting portion 33 which protrudes inwardly from the inner side wall of the piston 3. The axial limiting portion 33 mainly limits the axial position of the plunger 5, avoids the plunger 5 from being pulled out of the column cavity of the piston 3, facilitates the installation of the plunger 5, and improves the reliability of the air spring. After the air spring is installed on the vehicle, the limiting portion on the vehicle suspension can prevent the plunger 5 from colliding with the axial limiting portion 33.

[0035] The axial limiting portion 33 can be a plurality of protrusions distributed circumferentially around the piston 3, or can be a ring plate structure. As a further preferred, the axial limiting portion 33 is a ring plate structure arranged coaxially with the piston 3, which is simple in structure. The axial limiting portion 33 can be fastened to the piston 3 by bolts, pins or other connecting members, and as a further preferred, the axial limiting portion 33 is an integral structure with the piston 3, which ensures the limiting reliability of the axial limiting portion 33 and facilitates processing. Since the lower end of the piston 3 is provided with the axial limiting portion 33 integrally formed therewith, the plunger 5 cannot be loaded into the cylinder cavity from the lower end of the piston 3. Therefore, the cylinder cavity of the piston 3 penetrates the piston 3 in the up-down direction, and the sealing top plate 34 is welded to the upper portion of the piston 3. The sealing top plate 34 seals the upper end of the cylinder cavity. The second air inlet 32 is arranged on the sealing top plate 34. The lower end of the push rod 6 is detachably connected to the base 1. First, the plunger 5 and the push rod 6 are loaded into the cylinder cavity from the upper end of the piston 3. The plunger 5 is supported and limited by the axial limiting portion 33. After the push rod 6 is passed through the lower end of the piston 3, it is connected to the base 1. Finally, the sealing top plate 34 is welded to the piston 3.

[0036] The sealing top plate 34 can be arranged outside the cylinder cavity of the piston 3, or can be arranged inside the cylinder cavity of the piston 3. Considering that the air nozzle protruding outward needs to be arranged on the second air inlet 32, the air nozzle generally protrudes outward and is connected in communication with the air tank through an air pipe. Preferably, the sealing top plate 34 is arranged in the upper cylinder cavity of the piston 3 and sealingly cooperates with the inner side wall of the piston 3. The plunger 5 is located below the sealing top plate 34 and spaced apart therefrom. The second air inlet 32 is sealingly connected with an upwardly protruding air inlet nozzle 35. The upper end surface of the air inlet nozzle 35 is located below the upper end surface of the piston 3. The air inlet nozzle 35 is completely located in the upwardly recessed groove formed by the upper end surface of the sealing top plate 34 and the inner side wall of the piston 3, avoiding interference between the air inlet nozzle 35 and other structures on the suspension, and providing sufficient space for installation of the air pipe. If the air spring installation space is insufficient, an extension pipe can be arranged on the second air inlet 32 to connect the air inlet nozzle 35 to other positions of the suspension, further saving the installation space of the air spring, facilitating the arrangement and installation of other structures on the suspension, and allowing adjustment of the stiffness and cushioning performance of the air spring without disassembling the air spring.

[0037] Preferably, the cylinder cavity of the piston 3 above the axial limiting portion 33 is a stepped hole structure, and the stepped surface therein abuts against the lower end surface of the sealing top plate 34 to axially limit the sealing top plate 34, improving the assembly precision of the sealing top plate 34 and reducing the volume deviation of the auxiliary air chamber 42.

[0038] The plunger 5 can be a rubber column structure, or a composite structure composed of a skeleton and a rubber ring wrapped outside the skeleton. Specifically, the plunger 5 includes a plunger body 51, an annular groove coaxial with the plunger body 51 is arranged on the outer side of the plunger body 51, a first sealing ring 52 is arranged in the annular groove, the first sealing ring 52 protrudes out of the annular groove and is in sealing cooperation with the inner side wall of the piston 3, thereby ensuring the sealing cooperation between the plunger 5 and the inner side wall of the piston 3 and improving the air-tightness of the auxiliary air chamber 42.

[0039] The push rod 6 is used to connect the plunger 5 to the base 1, so that the base 1 drives the plunger 5 to move synchronously in the axial direction. The push rod 6 can be fixedly connected to the base 1, or connected to the base 1 through a latch, a bolt or the like. The push rod 6 and the plunger 5 can be an integral structure, or fixedly connected through welding or a screw, a pin shaft or the like. Preferably, the plunger 5 and the push rod 6 are connected through a universal ball joint, and the push rod 6 can be deflected by a certain angle relative to the plunger 5 and the piston 3 to adapt to the relative displacement of the base 1 and the piston 3 in the horizontal direction during the extension and contraction of the air spring. Generally, the plunger 5 and the push rod 6 are connected through a joint bearing. Specifically, the upper end of the push rod 6 is provided with a universal ball head, and the lower end surface of the plunger 5 is provided with a groove matched with the universal ball head of the push rod 6, and the universal ball head of the push rod 6 is connected in the groove on the lower end surface of the plunger 5.

[0040] The push rod 6 and the plunger 5 are generally installed before the plunger 5 is installed in the piston 3, so the push rod 6 and the base 1 should be detachably connected. The push rod 6 and the base 1 can be connected through a bolt or a latch. Preferably, the base 1 is provided with an axial through positioning stepped hole, the large hole of the positioning stepped hole is located on the side close to the main air chamber 41; the lower part of the push rod 6 is provided with a shaft ring 61 integrally formed thereon, the upper part of the push rod 6 below the shaft ring 61 is provided with a second sealing ring 62, and the upper part of the push rod 6 below the second sealing ring 62 is provided with a threaded section 63; the second sealing ring 62 is in sealing cooperation with the push rod 6; the push rod 6 penetrates through the positioning stepped hole, the second sealing ring 62 is in sealing cooperation with the hole wall of the large hole of the positioning stepped hole, the shaft ring 61 is in axial abutment with the top surface of the base 1; the threaded section 63 protrudes downward out of the base 1 and is connected with a fastening nut 64, and the upper end surface of the fastening nut 64 is closely attached to the base 1. The outer diameter of the shaft ring 61 is larger than the hole diameter of the large hole 11 of the positioning stepped hole. The shaft ring 61 and the fastening nut 64 cooperate to position and install the push rod 6 on the base 1, and the second sealing ring 62 is used to seal the gap between the positioning stepped hole and the push rod 6, thereby ensuring the air-tightness of the main air chamber 41.

[0041] During installation, as shown in FIG. 6, the push rod 6 is first positioned and installed on the base 1 through the shaft ring 61 and the fastening nut 64, and then the plunger 5 is connected to the push rod 6 through the universal ball joint. Figure 5As shown, first, the push rod 6 is connected with the plunger 5, then the push rod 6 is inserted into the column cavity from the upper end of the piston 3, the push rod 6 passes through the column cavity of the piston 3 from top to bottom and drives the plunger 5 into the column cavity of the piston 3, the axial limiting part 33 limits the plunger 3 in the column cavity of the piston 3, the lower end of the push rod 6 penetrates the positioning step hole of the base 1, the shaft ring 61 abuts against the upper end surface of the base 1 to axially pre-position the push rod 6, the second sealing ring 62 is in sealing cooperation with the push rod 6, the push rod 6 is positioned and installed on the base 1 through the fastening nut 64. Finally, the sealing top plate 34 is sealingly welded in the column cavity of the piston 3 to seal the auxiliary air chamber 42.

[0042] As a further preferred, the base 1 is provided with a downwardly protruding annular part 13, the annular part 13 and the base 1 form an installation cavity 14 with an opening downward, the threaded section 63 of the push rod 6 and the fastening nut 64 are located in the installation cavity 14, then it is necessary to avoid the lower end of the push rod 6 protruding from the base 1 to interfere with other structures, to protect the push rod 6 and the fastening nut 64, and to facilitate the arrangement of other parts or devices on the vehicle chassis.

[0043] In the utility model, "upper", "lower", "top", "bottom", "inner", "outer" are relative position relations, and cannot be understood as the limitation of specific direction. The embodiments of the specific embodiment are the preferred embodiments of the utility model, and are not limited to the protection scope of the utility model, so that: any equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. Independent double cavity air spring, comprising base (1), air bag (2) and piston (3), the lower end of the air bag (2) is in sealing cooperation with the base (1), the upper end of the air bag (2) is in sealing cooperation with the lower end of the piston (3), the base (1), the air bag (2) and the piston (3) form a closed gas cavity;Characterized in that: The piston (3) is provided with a downward opening column cavity, the column cavity is provided with a plunger (5) in axial sliding cooperation with the inner side wall of the piston (3), the plunger (5) is in sealing cooperation with the inner side wall of the piston (3);The plunger (5) separates the gas cavity into main air chamber (41) and auxiliary air chamber (42) isolated from each other, the main air chamber (41) is located on the lower side of the plunger (5), the auxiliary air chamber (42) is located on the upper side of the plunger (5);The piston (3) is provided with a first air inlet (31) connected with the main air chamber (41) and a second air inlet (32) connected with the auxiliary air chamber (42); The main air chamber (41) is provided with a push rod (6), the upper end of the push rod (6) is connected to the plunger (5), the lower end of the push rod (6) is connected to the base (1);The axis of the push rod (6) is arranged in the same direction as the axis of the column cavity in the piston (3).

2. The free-standing dual chamber air spring of claim 1, wherein: The lower end of the piston (3) is provided with an axial limiting part (33), the axial limiting part (33) protrudes inwardly from the inner side wall of the piston (3).

3. The free-standing dual chamber air spring of claim 2, wherein: The axial limiting part (33) is a ring plate structure arranged coaxially with the piston (3).

4. The free-standing dual chamber air spring of claim 3, wherein: The axial limiting part (33) and the piston (3) are an integral structure; The column cavity of the piston (3) penetrates the piston (3) in the up-down direction, a sealing top plate (34) is welded on the upper part of the piston (3), the sealing top plate (34) seals the upper port of the column cavity;The second air inlet (32) is arranged on the sealing top plate (34);The lower end of the push rod (6) is detachably connected with the base (1).

5. The free-standing dual chamber air spring of claim 4, wherein: The sealing top plate (34) is arranged in the upper column cavity of the piston (3) and is in sealing cooperation with the inner side wall of the piston (3), the plunger (5) is located below the sealing top plate (34) and is arranged with a spacing therebetween; The second air inlet (32) is sealingly connected with an upwardly protruding air inlet nozzle (35), the upper end surface of the air inlet nozzle (35) is located below the upper end surface of the piston (3).

6. The free-standing dual chamber air spring of claim 5, wherein: The column cavity of the piston (3) above the axial limiting part (33) is a stepped hole structure, and the stepped surface in the column cavity abuts against the lower end surface of the sealing top plate (34).

7. The free-standing dual chamber air spring of claim 1, wherein: The plunger (5) comprises a plunger body (51), the outer side surface of the plunger body (51) is provided with an annular groove coaxial therewith, the annular groove is provided with a first sealing ring (52), the first sealing ring (52) protrudes from the annular groove and is in sealing cooperation with the inner side wall of the piston (3).

8. The free-standing dual chamber air spring of any of claims 1-7, wherein: The plunger (5) and the push rod (6) are connected by a universal ball head.

9. The free-standing dual chamber air spring of claim 8, wherein: The base (1) is provided with an axial through positioning step hole, and a large hole of the positioning step hole is located on a side close to the main air chamber (41); The lower part of the push rod (6) is provided with an integral annular ring (61), a second sealing ring (62) is arranged on the push rod (6) above the annular ring (61), and a threaded section (63) is arranged on the push rod (6) below the second sealing ring (62); the second sealing ring (62) is in sealing cooperation with the push rod (6); The push rod (6) penetrates through the positioning step hole, the second sealing ring (62) is in sealing cooperation with the hole wall of the large hole of the positioning step hole, the annular ring (61) is in axial abutment with the top surface of the base (1), the threaded section (63) protrudes downward from the base (1) and is connected with a fastening nut (64), and the upper end surface of the fastening nut (64) is closely combined with the base (1).

10. The free-standing dual chamber air spring of claim 9, wherein: The base (1) is provided with a downward protruding annular part (13), the annular part (13) and the base (1) form an installation cavity (14) with an opening downward, and the threaded section (63) of the push rod (6) and the fastening nut (64) are located in the installation cavity (14).

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