Independent double-cavity air spring

Abstract

The invention belongs to the technical field of automobile suspensions, and particularly 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 invention belongs to the technical field of automobile suspension, and in particular relates to an independent double-chamber air spring. Background Art

[0002] Independent air springs refer to air springs that are assembled separately from shock absorbers. Compared with the pillar-type air springs that are integrated with shock absorbers, independent air springs have a simple structure and can more accurately and flexibly adjust their own stiffness and load-bearing capacity. They are widely used in luxury cars, commercial vehicles and other models with high comfort requirements.

[0003] The independent air spring mainly includes a base, an airbag and a piston. The lower end of the airbag is sealed with the base, and the upper end of the airbag is sealed with the lower end of the piston. The base, airbag and piston form a closed air chamber. The base is connected to the wheel frame, and the piston is connected to the suspension. The air pump is used to inflate the air chamber in the airbag to adjust the stiffness of the air spring to meet the driving needs of the vehicle on different road conditions and improve the driving comfort of the vehicle. When the vehicle is driving on an uneven road, if the amplitude of the up and down vibration of the vehicle body relative to the wheel frame is too large, the base and piston of the air spring will approach each other and collide rigidly, which will not only affect the driving comfort of the vehicle, but also cause damage to the air spring. In order to avoid the above situation, it is necessary to buffer the compression movement of the piston or base of the independent air spring.

[0004] At present, the compression movement of the air spring is further buffered and limited by setting a buffer block on the suspension swing arm or the shock absorber used in conjunction with the air spring. However, the way of integrating the buffer block into the shock absorber requires the shock absorber to be arranged vertically as much 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 installation space of the suspension, which is easy to affect the assembly of other components on the suspension. For this reason, the Chinese patent with publication number CN213744653U discloses an air spring, which buffers the impact between the top and bottom surfaces of the air spring in the vertical direction and limits the compression of the air spring by setting a solid structure of the limit buffer block in the air spring. It saves the installation space of the suspension and provides more options for the setting method of the shock absorber. However, when the vibration amplitude and impact of the vehicle are too large, the body and the suspension touch the bottom and make the top and bottom surfaces of the air spring close to each other to impact and squeeze the limit buffer block in the vertical direction. The limit buffer block is easily damaged and failed after being impacted and squeezed, affecting the driving comfort of the vehicle. In addition, the stiffness adjustment range of the air spring is limited. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to provide an independent double-chamber air spring provided with a main air chamber and an auxiliary air chamber, so as to expand the stiffness adjustment range of the air spring; to limit the compression of the air spring by injecting high-pressure gas into the auxiliary air chamber instead of a buffer limit block with a solid structure, so as to improve the compression buffering capacity of the air spring, accelerate the resetting of the air spring and the vehicle body, and improve the driving comfort of the vehicle.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an independent double-chamber air spring, comprising a base, an airbag and a piston, wherein the lower end of the airbag is sealed with the base, the upper end of the airbag is sealed with the lower end of the piston, and the base, the airbag and the piston form a closed gas chamber;

[0007] The piston is provided with a column cavity with an opening facing downward, and the column cavity is provided with a plunger that is axially slidably matched with the inner wall of the piston, and the plunger is sealed with the inner wall of the piston; the plunger divides the gas chamber into a main air chamber and an auxiliary air chamber that are isolated from each other, the main air chamber is located at the lower side of the plunger, and the auxiliary air chamber is located at the upper side of the plunger; the piston is provided with a first inflation port connected to the main air chamber and a second inflation port connected to the auxiliary air chamber;

[0008] A push rod is arranged in the main 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 is arranged in the same direction as the axis of the column cavity in the piston.

[0009] Furthermore, an axial limiting portion is provided at the lower end of the piston, and the axial limiting portion protrudes inwardly from the inner side wall of the piston.

[0010] Furthermore, the axial limiting portion is a ring plate structure coaxially arranged with the piston.

[0011] Furthermore, the axial limiting portion and the piston are an integral structure formed in one piece;

[0012] The column cavity of the piston passes through the piston in the up-down direction. A sealing top plate is welded on the upper part of the piston, and the sealing top plate 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 to the base.

[0013] Furthermore, the sealing top plate is arranged in the upper column cavity of the piston and is sealed with the inner wall of the piston, and the plunger is located below the sealing top plate and the two are arranged at an interval;

[0014] The second inflation port is sealedly connected with an inflation nozzle protruding upward, and the upper end surface of the inflation nozzle is located below the upper end surface of the piston.

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

[0016] Furthermore, the plunger includes a plunger body, the outer side of the plunger body is provided with an annular groove coaxial therewith, a first sealing ring is provided in the annular groove, the first sealing ring protrudes out of the annular groove and seals with the inner wall of the piston.

[0017] Furthermore, the plunger and the push rod are hinged via a universal ball head.

[0018] Furthermore, the base is provided with an axially penetrating positioning step hole, and the large hole of the positioning step hole is located on a side close to the main air chamber;

[0019] The lower part of the push rod is provided with a shaft ring integrally formed therewith, the upper hoop of the push rod 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 is in sealing cooperation with the push rod;

[0020] The push rod passes through the positioning step hole, the second sealing ring is sealed with the hole wall of the large hole of the positioning step hole, the shaft ring is axially abutted with the top surface of the base; the threaded section protrudes downward from the base and is connected to a fastening nut, and the upper end surface of the fastening nut is tightly fitted with the base.

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

[0022] Compared with the prior art, the beneficial effects of the present invention are: providing an independent double-chamber air spring, by setting a column cavity in the piston and setting a plunger in the column cavity to enclose an auxiliary air chamber with adjustable volume and airtightness, using the telescopic movement of the air spring itself to drive the axial reciprocating movement of the plunger to change the volume of the auxiliary air chamber and the gas pressure in the auxiliary air chamber, thereby changing the downward pressure value applied by the high-pressure gas in the auxiliary air chamber to the plunger. During the upward movement of the plunger, the downward pressure applied by the high-pressure gas in the auxiliary air chamber to the plunger gradually increases, providing a buffer force for the compression movement of the air spring and limiting the compression of the air spring, avoiding the rigid collision between the plunger and the piston, improving the driving comfort of the vehicle, and extending the service life of the air spring; on the contrary, when the air spring rebounds and stretches, the high-pressure gas in the auxiliary air chamber also provides thrust for the downward reset movement of the plunger, accelerating the rebound reset of the air spring. In addition, the air spring of the present invention has a main air chamber and an auxiliary air chamber that are independent of each other, and the initial air pressure of the two air chambers can be adjusted by adjusting the initial air filling amount of the main air chamber and the auxiliary air chamber, thereby more accurately adjusting the stiffness of the air spring. The plunger is axially limited by setting an axial limiter at the lower end of the piston to prevent the plunger from slipping out of the piston cavity, facilitate the installation of the plunger, and improve the reliability of the air spring. The plunger and the push rod are hinged by a universal ball head so that the push rod can deflect a certain angle relative to the plunger and the piston to adapt to the relative horizontal offset of the base and the piston during the expansion and contraction of the air spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the axial cross-sectional structure of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0025] Figure 3 yes Figure 1 A schematic diagram of the enlarged structure of the middle B part;

[0026] Figure 4 yes Figure 1 A schematic diagram of the cross-sectional structure of the middle base;

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

[0028] Figure markings: 1-base; 13-annular portion; 14-installation cavity; 2-airbag; 3-piston; 31-first inflation port; 32-second inflation port; 33-axial limiting portion; 34-sealing top plate; 35-inflating 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 DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] As attached Figure 1-5 As shown, an independent double-chamber air spring comprises a base 1, an airbag 2 and a piston 3, wherein the lower end of the airbag 2 is sealed with the base 1, and the upper end of the airbag 2 is sealed with the lower end of the piston 3, and the base 1, the airbag 2 and the piston 3 form a closed gas chamber; a column chamber with an opening facing downward is provided in the piston 3, a plunger 5 with an axial sliding fit with the inner side wall of the piston 3 is provided in the column chamber, and the plunger 5 is sealed with the inner side wall of the piston 3; the plunger 5 divides the gas chamber into mutually isolated The main air chamber 41 and the auxiliary air chamber 42 are separated, the main air chamber 41 is located at the lower side of the plunger 5, and the auxiliary air chamber 42 is located at the upper side of the plunger 5; the piston 3 is provided with a first inflation port 31 connected to the main air chamber 41 and a second inflation port 32 connected to the auxiliary air chamber 42; a push rod 6 is provided in the main air chamber 41, the upper end of the push rod 6 is connected to the plunger 5, and 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.

[0031] The base 1 of the air spring of the present invention is connected to the wheel frame, and the piston 3 is connected to the suspension. The auxiliary air chamber 42 is filled with high-pressure gas through the second air filling port 32, and the main air chamber 41 is filled with compressed gas through the first air filling port 31. The pressure of the gas in the auxiliary air chamber 42 should be greater than the pressure of the gas in the main air chamber 41. During the driving process of the vehicle, the suspension drives the air spring to extend and retract, and then the base 1 drives the push rod 6 and the plunger 5 to reciprocate 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 air chamber 42. When the air spring is compressed, the base 1 and piston 3 of the air spring move toward each other. Relative to the piston 3, the base 1 drives the push rod 6 and the plunger 5 to move upward synchronously. The plunger 5 slides upward in the column cavity to compress the volume of the auxiliary air chamber 42. The gas pressure in the auxiliary air chamber 42 gradually increases and applies a downward reaction force to the plunger 5, providing resistance for the compression movement of the entire air spring. During the upward movement of the plunger 5, the reaction force of the compressed gas in the auxiliary air chamber 42 gradually increases until the plunger 5 is limited to stop moving upward, and the air spring stops compressing. Subsequently, the suspension reset movement stretches the air spring, and the base 1 and piston 3 of the air spring move away from each other. Relative to the piston 3, the base 1 drives the push rod 6 and the plunger 5 to move downward synchronously. At the same time, the high-pressure gas in the auxiliary air chamber 42 pushes the plunger 5 to accelerate the downward sliding of the plunger 5. The plunger 5 pushes the push rod 6 and the base 1 to accelerate the downward movement, thereby causing the air spring to rebound and reset quickly, accelerating the rapid reset of the vehicle body.

[0032] The present invention arranges a column cavity in the piston 3 and a plunger 5 in the column cavity to enclose an auxiliary air chamber 42 with adjustable volume and sealed, and utilizes the telescopic movement of the air spring itself to drive the axial reciprocating movement of the plunger 5 to change the volume of the auxiliary air chamber 42 and the gas pressure in the auxiliary air chamber 42, thereby changing the magnitude of the downward pressure applied by the high-pressure gas in the auxiliary air chamber 42 to the plunger 5. During the upward movement of the plunger 5, the downward pressure applied by the high-pressure gas in the auxiliary air chamber 42 to the plunger 5 gradually increases, providing a buffer force for the compression movement of the air spring and limiting the compression of the air spring, avoiding the rigid collision between the plunger 5 and the piston 3, improving the driving comfort of the vehicle, and extending the service life of the air spring; correspondingly, the high-pressure gas in the auxiliary air chamber 42 also provides thrust for the downward reset movement of the plunger 5 during the rebound stretching movement of the air spring, accelerating the rebound reset of the air spring. In addition, the air spring of the present invention has a main air chamber 41 and an auxiliary air chamber 42 which are independent of each other. The initial air pressure of the two air chambers can be adjusted by adjusting the initial air filling amount of the main air chamber 41 and the auxiliary air chamber 42, thereby more accurately adjusting the stiffness of the air spring.

[0033] The base 1 is used to seal the lower end of the airbag 2 and connect the air spring to the wheel frame. The base 1 can be a cylindrical structure with one end sealed, or a solid columnar structure. The piston 3 is used to seal the upper end of the airbag 2 and connect the air spring to the vehicle suspension. The airbag 2 is generally sleeved on the outer circumference of the base 1 and the piston 3. The airbag 2 can be sealed with the base 1 and the piston 3 by means of hooping, crimping, etc. The main air chamber 41 is used to contain compressed gas, and the auxiliary air chamber 42 is used to contain high-pressure gas. The stiffness of the air spring can be adjusted by adjusting the air pressure in the main air chamber 41 and the auxiliary air chamber 42.

[0034] The plunger 5 is sealed and connected to the inner wall of the piston 3 to form a closed auxiliary air chamber 42, and the plunger 5 slides up and down to adjust the volume of the auxiliary air chamber 42 and the air pressure of the auxiliary air chamber 42. When the air spring stretching stroke is too large, the plunger 5 is likely to slip out of the lower port of the piston 3 and cannot be reset, resulting in air spring failure. Preferably, an axial limit portion 33 is provided at the lower end of the piston 3, and the axial limit portion 33 protrudes inward from the inner side wall of the piston 3. The axial limit portion 33 mainly limits the plunger 5 axially to prevent the plunger 5 from slipping 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 limit portion on the vehicle suspension can prevent the plunger 5 from colliding with the axial limit portion 33.

[0035] The axial limiting portion 33 can be a plurality of protrusions distributed along the circumference of the piston 3, or a ring plate structure. As a further preference, the axial limiting portion 33 is a ring plate structure coaxially arranged with the piston 3, and has a simple structure. The axial limiting portion 33 can be fastened to the piston 3 by connecting members such as bolts and latches. As a further preference, the axial limiting portion 33 and the piston 3 are an integral structure formed in one piece, which ensures the limiting reliability of the axial limiting portion 33 and facilitates processing. Because the lower port of the piston 3 is provided with an axial limiting portion 33 formed in one piece with it, the plunger 5 cannot be loaded into the column cavity from the lower port of the piston 3. Therefore, the column cavity of the piston 3 passes through the piston 3 in the up and down directions. A sealing top plate 34 is welded on the upper part of the piston 3, and the sealing top plate 34 seals the upper port of the column cavity; the second inflation port 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 installed into the column cavity from the upper port of the piston 3. The plunger 5 is supported and limited by the axial limit portion 33. The push rod 6 passes through the lower port of the piston 3 and 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 column cavity of the piston 3, or it can be arranged inside the column cavity of the piston 3. Considering that an outwardly protruding air nozzle needs to be arranged on the second inflation port 32, the air nozzle generally protrudes outward and is connected to the inflation tank through an air pipe. Preferably, the sealing top plate 34 is arranged in the upper column cavity of the piston 3 and is sealed with the inner wall of the piston 3, and the plunger 5 is located below the sealing top plate 34 and the two are arranged at intervals; the second inflation port 32 is sealed and connected with an upwardly protruding inflation nozzle 35, and the upper end surface of the inflation nozzle 35 is located below the upper end surface of the piston 3. The inflation nozzle 35 is completely located in the upwardly opening groove surrounded by the upper end surface of the sealing top plate 34 and the inner wall of the piston 3, so as to avoid interference between the inflation nozzle 35 and other structures on the suspension and provide sufficient space for the installation of the air pipe. If there is insufficient space for installing the air spring, an extension tube can be provided on the second inflation port 32 to connect the inflation nozzle 35 to other positions of the suspension, thereby further saving installation space for the air spring and facilitating the arrangement and installation of other structures on the suspension. The stiffness and cushioning performance of the air spring can be adjusted without removing the air spring, which is convenient and quick.

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

[0038] The plunger 5 may be a rubber column structure, or a composite structure consisting of a frame and a rubber ring wrapped around the frame. Specifically, the plunger 5 includes a plunger body 51, an annular groove coaxial with the plunger body 51 is provided on the outer side of the plunger body 51, a first sealing ring 52 is provided in the annular groove, the first sealing ring 52 protrudes from the annular groove and seals with the inner side wall of the piston 3, thereby ensuring the sealing of the plunger 5 and the inner side wall of the piston 3 and improving the airtightness 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 synchronously reciprocate axially. The push rod 6 can be fixedly connected to the base 1, or connected to the base 1 through a connector such as a latch or a bolt. The push rod 6 and the plunger 5 can be an integral structure formed in one piece, or can be welded or fixedly connected through a structure such as a screw or a pin. Preferably, the plunger 5 and the push rod 6 are hinged through a universal ball head, 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 telescopic movement of the air spring. Generally, the plunger 5 and the push rod 6 are hinged through a spherical bearing. Specifically, a universal ball head is provided at the upper end of the push rod 6, and a groove matching the universal ball head on the lower end surface of the plunger 5 is provided, and the universal ball head on the push rod 6 is hinged 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. Therefore, the push rod 6 and the base 1 should be detachably connected. The push rod 6 and the base 1 can be connected by bolts or pins. Preferably, the base 1 is provided with an axially through positioning step hole, and the large hole of the positioning step 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 therewith, and the push rod 6 below the shaft ring 61 is provided with a second sealing ring 62, and the push rod 6 below the second sealing ring 62 is provided with a threaded section 63; the second sealing ring 62 is sealed with the push rod 6; the push rod 6 passes through the positioning step hole, and the second sealing ring 62 is sealed with the hole wall of the large hole of the positioning step hole, and the shaft ring 61 is axially abutted 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 tightly fitted with the base 1. The outer diameter of the collar 61 is larger than the diameter of the large hole 11 of the positioning step hole. The collar 61 cooperates with the fastening nut 64 to position and install the push rod 6 on the base 1. The second sealing ring 62 is used to seal the gap between the positioning step hole and the push rod 6 to ensure the sealing of the main air chamber 41.

[0041] During installation, if Figure 5As shown, the push rod 6 is first connected to the plunger 5, and 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 to enter the column cavity of the piston 3. The axial limiter 33 limits the plunger 3 in the column cavity of the piston 3. The lower end of the push rod 6 passes through the positioning step hole of the base 1 so that the shaft ring 61 abuts against the upper end surface of the base 1 to pre-position the push rod 6 axially, so that the second sealing ring 62 and the push rod 6 are sealed and matched, and the push rod 6 is positioned and installed on the base 1 by tightening the nut 64. Finally, the sealing top plate 34 is sealed and welded in the column cavity of the piston 3 to seal the auxiliary air chamber 42.

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

[0043] The terms "upper", "lower", "top", "bottom", "inside" and "outside" in the present invention are relative positional relationships and cannot be understood as limitations on specific positions. The embodiments of this specific implementation are all preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An independent double-chamber air spring, comprising a base (1), an airbag (2) and a piston (3), wherein the lower end of the airbag (2) is sealed with the base (1), the upper end of the airbag (2) is sealed with the lower end of the piston (3), and the base (1), the airbag (2) and the piston (3) form a closed gas chamber; characterized in that: The piston (3) is provided with a column cavity with an opening facing downward, and the column cavity is provided with a plunger (5) that is axially slidably matched with the inner wall of the piston (3), and the plunger (5) is sealed with the inner wall of the piston (3); the plunger (5) divides the gas chamber into a main gas chamber (41) and an auxiliary gas chamber (42) that are isolated from each other, the main gas chamber (41) is located at the lower side of the plunger (5), and the auxiliary gas chamber (42) is located at the upper side of the plunger (5); the piston (3) is provided with a first inflation port (31) that is connected to the main gas chamber (41) and a second inflation port (32) that is connected to the auxiliary gas chamber (42); A push rod (6) is provided in the main air chamber (41), the upper end of the push rod (6) is connected to the plunger (5), and 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 independent double-chamber air spring according to claim 1, characterized in that: An axial limiting portion (33) is provided at the lower end of the piston (3), and the axial limiting portion (33) protrudes inwardly from the inner side wall of the piston (3).

3. The independent double-chamber air spring according to claim 2, characterized in that: The axial limiting portion (33) is a ring plate structure arranged coaxially with the piston (3).

4. The independent double-chamber air spring according to claim 3, characterized in that: The axial limiting portion (33) and the piston (3) are an integral structure formed in one piece; The column cavity of the piston (3) passes through the piston (3) in the up-down direction; a sealing top plate (34) is welded to the upper part of the piston (3); the sealing top plate (34) seals the upper end of the column cavity; the second inflation port (32) is arranged on the sealing top plate (34); the lower end of the push rod (6) is detachably connected to the base (1).

5. The independent double-chamber air spring according to claim 4, characterized in that: The sealing top plate (34) is arranged in the upper column cavity of the piston (3) and is sealed with the inner wall of the piston (3); the plunger (5) is located below the sealing top plate (34) and the two are arranged at an interval; The second inflation port (32) is sealedly connected to an upwardly protruding inflation nozzle (35), and the upper end surface of the inflation nozzle (35) is located below the upper end surface of the piston (3).

6. The independent double-chamber air spring according to claim 5, characterized in that: The column 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).

7. The independent dual-chamber air spring according to claim 1, characterized in that: 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, a first sealing ring (52) is provided in the annular groove, and the first sealing ring (52) protrudes out of the annular groove and is sealingly matched with the inner side wall of the piston (3).

8. The independent double-chamber air spring according to any one of claims 1 to 7, characterized in that: The plunger (5) and the push rod (6) are hinged via a universal ball head.

9. The independent double-chamber air spring according to claim 8, characterized in that: The base (1) is provided with an axially penetrating positioning step hole, wherein the large hole of the positioning step hole is located on a side close to the main air chamber (41); The push rod (6) is provided with a shaft ring (61) formed integrally therewith at its lower part, a second sealing ring (62) is provided on the push rod (6) below the shaft ring (61), and a threaded section (63) is provided 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) passes through the positioning step hole, the second sealing ring (62) is sealed with the hole wall of the large hole of the positioning step hole, and the shaft ring (61) is axially abutted against the top surface of the base (1); the threaded section (63) protrudes downward from the base (1) and is connected to a fastening nut (64), and the upper end surface of the fastening nut (64) is tightly fitted with the base (1).

10. The independent double-chamber air spring according to claim 9, characterized in that: The base (1) is provided with a downwardly protruding annular portion (13), the annular portion (13) and the base (1) enclose a mounting cavity (14) with an opening facing downward, and the threaded section (63) of the push rod (6) and the fastening nut (64) are located in the mounting cavity (14).

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