Double chamber air spring structure

Abstract

The application provides a double-cavity air spring structure, which comprises an air spring assembly, a main cavity and a secondary cavity are arranged in the air spring assembly, the main cavity is arranged above the secondary cavity, and the main cavity and the secondary cavity are arranged in a separated mode; a valve device is arranged between the main cavity and the secondary cavity, so as to control the communication and the cut-off communication of the main cavity and the secondary cavity, and when the communication is realized, the main cavity and the secondary cavity jointly provide a damping cavity, and when the cut-off communication is realized, the main cavity alone provides a damping cavity; and a gas nozzle is arranged, one end of the gas nozzle is communicated with the outside, and the other end of the gas nozzle is communicated with the main cavity. The double-cavity air spring can provide two kinds of stiffness modes, which are switched with each other, so that the vehicle handling performance can be considered while the riding comfort is met.

Description

Technical Field

[0001] This invention relates to the field of air spring technology, and in particular to a dual-cavity air spring structure. Background Technology

[0002] The rear air spring, or simply air spring, is often designed as a separate unit for the shock absorber and air spring due to space constraints in the vehicle. Dual-chamber air springs can significantly improve ride comfort while also maintaining good handling.

[0003] Currently, most products on the market use a structure of welded plastic parts and plastic threads with sealing rings and external metal reinforcing rings. This process is complex and has many potential points of leakage. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a dual-cavity air spring structure to solve the problems of the existing technology, which mostly adopts the structure of welding plastic parts and plastic threads with sealing rings and metal reinforcing rings, which has complex processes and many leakage risk points.

[0005] To achieve the above and other related objectives, the present invention provides a dual-chamber air spring structure, comprising: an air spring assembly having a main chamber and a secondary chamber therein, the main chamber being located above the secondary chamber and the main chamber and the secondary chamber being separated from each other; a valve device installed between the main chamber and the secondary chamber to control the connection and disconnection of the main chamber and the secondary chamber, wherein when connected, the main chamber and the secondary chamber jointly provide a damping cavity, and when disconnected, the main chamber alone provides a damping cavity; and an air nozzle, one end of which is connected to the outside, and the other end of which is connected to the main chamber.

[0006] In one embodiment of the present invention, the air spring assembly includes: an undulating piston, a piston chamber being formed on one side of the bottom of the undulating piston, and an air nozzle being installed on the top of the undulating piston; a lower swing seat being disposed below the undulating piston, a valve device being installed in the middle of the lower swing seat, and a plurality of air intake channels being provided circumferentially on the side of the lower swing seat; and a bladder assembly, the bladder assembly being cylindrical in shape, the bladder assembly passing through the lower outer surface of the lower end of the lower swing seat to the lower outer surface of the undulating piston, so that a main chamber is formed between the piston chamber, the bladder assembly and the top of the lower swing seat, and a secondary chamber is formed between the air intake channels and the corresponding positions of the bladder assembly.

[0007] In one embodiment of the present invention, the bladder assembly includes: a support ring located between the undulating piston and the lower pivot seat; a bladder, the middle portion of which is mounted on the support ring, the top of which is sealed to the outer surface of the lower end of the undulating piston, and the lower end of which is sealed to the outer surfaces of the lower pivot seat on both the upper and lower sides of the intake passage; and a bladder guide sleeve fitted onto the outer surface of the bladder, the lower end of which extends out of the bottom side of the support ring.

[0008] In one embodiment of the present invention, one end of the bladder is pressed against the outer surface of the lower end of the undulating piston by a first pressure ring. The bladder, which is pressed out by the first pressure ring, is rolled up in an "S" shape and connected to the lower swing seat 14 to form the main chamber.

[0009] In one embodiment of the present invention, a second pressure ring is pressed onto the outer surface of the bladder corresponding to the upper and lower sides of the secondary chamber.

[0010] In one embodiment of the present invention, the air spring assembly further includes: a dust cover assembly, the top of which is connected to the top surface of the undulating piston, and the bottom of which is connected to the top outer surface of the lower swing seat.

[0011] In one embodiment of the present invention, the dust cover assembly includes: a dust cover mounting pad, the middle part of which is fitted onto the top of the undulating piston; a clamp, the clamp being fitted onto the outer surface of the second pressure ring of the top set; and a dust cover, the upper end of which is connected to the outer ring of the dust cover mounting pad, the lower end of which is connected to the clamp, and the dust cover is a corrugated cover.

[0012] In one embodiment of the present invention, the valve device is a solenoid valve.

[0013] In one embodiment of the present invention, a mounting chamber corresponding to the valve device is provided in the middle of the lower seat. The top of the mounting chamber is connected to the main chamber, and the top of the mounting chamber is connected to the air intake channel through the valve device.

[0014] In one embodiment of the present invention, the valve device includes: a valve seat, which is installed on the top inner wall of the mounting chamber, and has an air inlet passage in the middle of the valve seat. A first sealing ring is provided between the outer wall of the valve seat and the top inner wall of the mounting chamber to seal the space between the outer wall of the valve seat and the top inner wall of the mounting chamber; and an electric valve body, which is correspondingly disposed below the valve seat. The lower outer wall of the valve seat is inserted into the bottom inner wall of the mounting chamber, and a second sealing ring is provided between the lower outer wall of the valve seat and the bottom inner wall of the mounting chamber to seal the space between the lower outer wall of the valve seat and the bottom inner wall of the mounting chamber; the first sealing ring and the second sealing ring are respectively located on the upper and lower sides of the air inlet passage.

[0015] In one embodiment of the present invention, the lower swing seat includes: an upper swing seat body, the outer surface of which is provided with a first corrugated protrusion corresponding to the second pressure ring of the top group; a lower swing seat body, which is located below the upper swing seat body, the outer surface of which is provided with a second corrugated protrusion corresponding to the second pressure ring of the bottom group; and a support member, which is vertically connected between the upper swing seat body and the lower swing seat body to form an air intake channel.

[0016] As described above, the dual-cavity air spring structure of the present invention has the following beneficial effects: By utilizing a main chamber and a secondary chamber arranged vertically within the air spring assembly, and controlling the connection or disconnection of the main chamber and the secondary chamber through a valve device, when the main chamber and the secondary chamber are connected, they jointly provide a damping cavity, resulting in a relatively large damping cavity volume, low stiffness, and good comfort. When the connection between the main chamber and the secondary chamber is disconnected, the main chamber provides a damping cavity independently, resulting in a relatively small damping cavity volume, high rigidity, and good operability. Furthermore, by connecting the top of the bladder to the undulating piston to form the main chamber, and sealing the bottom of the bladder to the surface of the lower swing seat corresponding to the air intake channel, a secondary chamber is formed. This achieves a dual-cavity spring structure with both a main chamber and a secondary chamber using the bladder. Moreover, through the mutual sealing installation between the bladder and the lower swing seat, when the valve device disconnects the connection, the bladder corresponding to the secondary chamber does not participate in damping. Furthermore, the upper and lower distribution structure of the main chamber and the auxiliary chamber allows the air nozzle installed on top of the air spring assembly to reach the piston chamber through a shorter intake passage, thereby shortening the air path during intake and reducing the structural complexity of the dual-cavity spring structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the air spring structure of the present invention.

[0018] Figure 2 This invention is shown as Figure 1 Enlarged diagram of point A in the middle.

[0019] Figure 3 The diagram shown is an enlarged schematic of the structure of the lower swing seat of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the lower swing seat of the present invention.

[0021] Figure 5 The image shown is a cross-sectional view of the lower swing arm of this invention.

[0022] Component designation explanation

[0023] Air spring assembly 1; valve device 2; air nozzle 3; main chamber 11; auxiliary chamber 12; undulating piston 13; lower swing seat 14; bladder assembly 15; dust cover assembly 16; piston chamber 131; air intake passage 141; upper swing seat 142; lower swing seat 143; support member 144; mounting chamber 145; support ring 151; bladder 152; bladder guide sleeve 153; first pressure ring 154; second pressure ring 155; dust cover mounting pad 161; clamp 162; dust cover 163; valve seat 21; electric valve body 22; first sealing ring 211; air intake passage 212; second sealing ring 221. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0025] Please see Figures 1 to 5 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0026] Please see Figure 1 This invention provides a dual-chamber air spring structure, comprising: an air spring assembly 1, wherein the air spring assembly 1 has a main chamber 11 and a secondary chamber 12, the main chamber 11 being located above the secondary chamber 12, and the main chamber 11 and the secondary chamber 12 being separated from each other; a valve device 2, which is installed between the main chamber 11 and the secondary chamber 12 to control the connection and disconnection of the main chamber 11 and the secondary chamber 12, wherein when connected, the main chamber 11 and the secondary chamber 12 jointly provide a damping cavity, and when disconnected, the main chamber 11 alone provides a damping cavity; and an air nozzle 3, one end of which is connected to the outside, and the other end of which is connected to the main chamber 11.

[0027] In one embodiment of the present invention, during the shock absorption process using an air spring, the main chamber 11 and the auxiliary chamber 12 are divided into upper and lower sections by the air spring assembly 1. Simultaneously, a valve device 2 is used to connect and disconnect the main chamber 11 and the auxiliary chamber 12. This controls the gas passage within the air spring cavity, thereby changing the volume of the utilized cavity to provide different stiffnesses. Specifically, when the valve device 2 is closed, air is supplied only through the main chamber 11, resulting in a relatively small air supply volume, high stiffness, and good operability. When the valve device 2 is open, air is supplied simultaneously from both the main chamber 11 and the auxiliary chamber 12, resulting in a relatively large air supply volume, low stiffness, and better comfort. The main chamber 11 and the auxiliary chamber 12 are arranged sequentially, with the air nozzle 3 positioned on the air spring assembly 1 above the main chamber 11. This allows for a relatively short distance between the nozzle 3 and the main chamber 11, facilitating direct air supply to the main chamber 11 via the nozzle 3 when external air is introduced.

[0028] like Figure 1 As shown, the air spring assembly 1 includes: an undulating piston 13, a piston chamber 131 is provided on one side of the bottom of the undulating piston 13, and an air nozzle 3 is installed on the top of the undulating piston 13; a lower swing seat 14 is located below the undulating piston 13, a valve device 2 is installed in the middle of the lower swing seat 14, and several sets of air intake channels 141 are provided circumferentially on the side of the lower swing seat 14; and a bladder assembly 15, which is cylindrical in shape and passes through the lower outer surface of the lower end of the lower swing seat 14 to the lower outer surface of the undulating piston 13, so that a main chamber 11 is formed between the piston chamber 131, the bladder assembly 15 and the top of the lower swing seat 14, and a secondary chamber 12 is formed between the air intake channel 141 and the corresponding position of the bladder assembly 15.

[0029] In one embodiment of the present invention, when the air spring assembly 1 forms the main chamber 11 and the auxiliary chamber 12, the upper end of the bladder assembly 15 is connected to the lower end of the undulating piston 13, and the bladder assembly 15 is simultaneously sealed and fitted onto the lower swing member 14, corresponding to the air intake channel 141. This allows the bladder assembly 15 to simultaneously form the main chamber 11 between the undulating piston 13 and the lower swing member 14, and the auxiliary chamber 12 corresponding to the air intake channel 141 on the side of the lower swing member 14. By simultaneously forming the main chamber 11 and the auxiliary chamber 12 with the bladder assembly 15, a damping cavity can be provided by both the main chamber 11 and the auxiliary chamber 12 when the valve device 2 is open. When the valve device 2 is closed, only the main chamber 11 provides the damping cavity. Moreover, since the secondary chamber 12 is installed on the lower swing seat 14, even if the lower swing seat 14 is covered by the bladder assembly 15, the bladder assembly 15 corresponding to the secondary chamber 12 will not participate in shock absorption.

[0030] The bladder assembly 15 includes: a support ring 151 located between the undulating piston 13 and the lower pivot seat 14; a bladder 152, the middle part of which is mounted on the support ring 151, the top of which is sealed to the outer surface of the lower end of the undulating piston 13, and the lower end of which is sealed to the outer surface of the lower pivot seat 14 on both the upper and lower sides of the intake passage 141; and a bladder guide sleeve 153 fitted onto the outer surface of the bladder 152, the lower end of which extends out of the bottom side of the support ring 151.

[0031] In one embodiment of the present invention, the bladder assembly 15 uses a support ring 151 to support the inner wall of the bladder 152 forming the main chamber 11. The bladder 152 has a certain burst diameter and burst volume, and the outer expansion diameter of the bladder 152 is limited by the bladder guide sleeve 153.

[0032] One end of the bladder 152 is pressed onto the outer surface of the lower end of the undulating piston 13 by the first pressure ring 154. The bladder 152, which is pressed out by the first pressure ring 154, is rolled up in an "S" shape and connected to the lower swing seat 14 to form the main chamber 11.

[0033] In one embodiment of the present invention, during the installation of the undulating piston 13 and the lower swing seat 14, the bladder 152 is pressed between one end of the bladder 152 and the first pressure ring 154 located on the outer surface of the lower end of the undulating piston 13. Then, the bladder 152 is rolled up so that the other end of the rolled-up bladder 152 connects to the lower swing seat 14. This achieves the use of the space through the piston chamber 131, and the space formed by the piston chamber 131, the bladder 152, and the top of the lower swing seat 14 as the main chamber 11. Specifically, there are two positions forming the "S" shape: one is the position where, after the bladder 152 is pressed by the first pressure ring 154, it is located on the bottom side of the first pressure ring 154, on the pressed side of the first pressure ring 154, and on the outer wall of the first pressure ring 154, forming a "J" shape; the other is the position where the bladder 152 extends from the pressed side of the first pressure ring 154 to the top of the first pressure ring 154, forming a "J" shape and then rolled downwards. And at this rolled-up position, it continues to extend downwards until it connects with the lower hem seat 14.

[0034] The air spring assembly 1 also includes a dust cover assembly 16, the top of which is connected to the top surface of the undulating piston 13, and the bottom of which is connected to the top outer surface of the lower swing seat 14.

[0035] In one embodiment of the present invention, the dust cover assembly 16 directly covers the top surface of the lower swing seat 14 from the top side of the undulating piston 13. This achieves waterproofing and dustproofing of the bladder assembly 152 corresponding to the main chamber 11, and protects the bladder 152 from damage caused by impacts from sharp foreign objects.

[0036] like Figure 1 and 2 As shown, the dust cover assembly 16 includes: a dust cover mounting pad 161, the middle of which is fitted onto the top of the undulating piston 13; a clamp 162, which is fitted onto the outer surface of the second pressure ring 155 in the top group; and a dust cover 163, the upper end of which is connected to the outer ring of the dust cover mounting pad 161, and the lower end of which is connected to the clamp 162. The dust cover 163 is a corrugated cover.

[0037] In one embodiment of the present invention, a dust cover mounting pad 161 is used to shield one side of the top of the undulating piston 13. Furthermore, a clamp 162 is used to clamp the lower end of the dust cover 163 onto the outer surface of the second pressure ring 155 of the top set, and the upper end of the dust cover 163 is connected to the dust cover mounting pad 161. This allows the corrugated cover to correspondingly contract and expand vertically as the undulating piston 13 moves up and down.

[0038] The valve device 2 is a solenoid valve. Opening the solenoid valve connects the main chamber 11 and the auxiliary chamber 12, allowing both chambers to function as a damping cavity for improved comfort. When the solenoid valve is closed, the connection between the main chamber 11 and the auxiliary chamber 12 is broken, allowing the main chamber 11 to function solely as a damping cavity for better maneuverability.

[0039] like Figure 1 and 3 As shown, the outer surfaces of the skin 152 corresponding to the upper and lower sides of the secondary chamber 12 are respectively fitted with second pressure rings 155.

[0040] In one embodiment of the present invention, by using a second pressure ring 155 to press against the bladders 152 constituting the upper and lower sides of the sub-chamber 12, a sealed state is formed between the bladders 152 constituting the sub-chamber 12 and the lower swing seat 14. This allows the bladders 152, extending downwards to the lower swing seat 14, to form a sub-chamber 12 that may or may not participate in the formation of a shock-absorbing cavity. Specifically, the position of the second pressure ring 155 also corresponds to the upper and lower surfaces of the lower swing seat 14 on the upper and lower sides of the sub-chamber 12.

[0041] like Figure 1 and 3 As shown, the lower swing seat 14 has an installation chamber 145 in the middle that corresponds to the valve device 2. The top of the installation chamber 145 is connected to the main chamber 11, and the top of the installation chamber 145 is connected to the air intake channel 141 through the valve device 2.

[0042] In one embodiment of the present invention, when the lower swing seat 14 and the valve device 2 establish or disconnect the connection between the main chamber 11 and the auxiliary chamber 12, the main chamber 11 establishes a connection with the auxiliary chamber 12 through the mounting chamber 145 when the valve device 2 is open. Simultaneously, when the valve device 2 is closed, the mounting chamber 145 disconnects the connection between the main chamber 11 and the auxiliary chamber 12.

[0043] like Figure 4 As shown, the lower swing seat 14 includes: an upper swing seat body 142, the outer surface of which is provided with a first corrugated protrusion corresponding to the second pressure ring 155 of the top group; a lower swing seat body 143, which is located below the upper swing seat body 142, the outer surface of which is provided with a second corrugated protrusion corresponding to the second pressure ring 155 of the bottom group; and a support member 144, which is vertically connected between the upper swing seat body 142 and the lower swing seat body 143 to form an air intake channel 141.

[0044] In one embodiment of the present invention, when the lower swing seat 14 is fitted with the bladder 152, the second pressure ring 155 of the top set is pressed onto the corresponding first corrugated protrusion of the upper swing seat 142, thereby improving the anti-slip properties between the bladder 152 and the upper swing seat 142, and also improving the sealing performance. Similarly, the second corrugated protrusion on the lower swing seat 143 also improves the anti-slip properties and sealing performance with the bladder 152, thereby improving the sealing effect of the secondary chamber 12. Moreover, when the support member 144 supports the upper swing seat 142 and the lower swing seat 143, the edges of the upper swing seat 142 and the lower swing seat 143 extend beyond the outer edge of the support member 144. This ensures that when the bladder 152 is sealed on the upper swing seat 142 and the lower swing seat 143, adjacent support members 144 are interconnected, making the air pressure in the secondary chamber 12 more stable and balanced. Specifically, the upper hem 142, lower hem 143, and support 144 constituting the lower hem 14 are integrally formed structures. Moreover, the lower hem 14 can be a non-metallic part such as a plastic part, or a metal part such as a casting or forging.

[0045] like Figure 5As shown, the valve device 2 includes: a valve seat 21, which is installed on the top inner wall of the mounting chamber 145, with an air inlet 212 in the middle of the valve seat 21, and a first sealing ring 211 between the outer wall of the valve seat 21 and the top inner wall of the mounting chamber 145 to seal the space between the outer wall of the valve seat 21 and the top inner wall of the mounting chamber 145; and an electric valve body 22, which is correspondingly located below the valve seat 21, with the lower outer wall of the valve seat 21 inserted into the bottom inner wall of the mounting chamber 145, and a second sealing ring 221 between the lower outer wall of the valve seat 21 and the bottom inner wall of the mounting chamber 145 to seal the space between the lower outer wall of the valve seat 21 and the bottom inner wall of the mounting chamber 145; the first sealing ring 211 and the second sealing ring 221 are located on the upper and lower sides of the air inlet 141, respectively.

[0046] In one embodiment of the present invention, when the valve device 2 closes the mounting cavity 145 to disconnect the communication between the main chamber 11 and the auxiliary chamber 12, and opens the mounting cavity 145 to connect the main chamber 11 and the auxiliary chamber 12, the power output end of the electric valve body 22 blocks the air intake passage 212 on the valve seat 21, thereby achieving the disconnection of the communication between the main chamber 11 and the auxiliary chamber 12. When the power output end of the electric valve body 22 leaves the valve seat 21, the main chamber 11 establishes communication with the air intake passage 141 through the air intake passage 212 and the gap between the electric valve body 22 and the mounting cavity 145, thus achieving mutual communication between the main chamber 11 and the auxiliary chamber 145.

[0047] Please see Figure 1 As shown, the present invention also provides a specific working process of a dual-chamber air spring structure: gas enters the main chamber 11 located in the upper half of the air spring assembly 1 through the air nozzle 3 at the top of the air spring assembly 1. When the valve device 2 is open, it enters the auxiliary chamber 12 through the mounting chamber 145. When high rigidity and good operability are required, the connection between the main chamber 11 and the auxiliary chamber 12 is closed by the valve device 2. At this time, since the bladder 152 corresponding to the auxiliary chamber 12 is mounted on the lower swing seat 14, when the bladder 152 corresponding to the main chamber 11 deforms, it will not affect the auxiliary chamber 12 and the bladder 152 corresponding to the auxiliary chamber 12. When the valve device 2 is open, the main chamber 11 and the auxiliary chamber 12 are connected by the power output end of the electric valve body 22 away from the valve seat 21. The main chamber 11 is connected to the air intake channel 141 through the gap formed between the air intake duct 211, the power output end of the electric valve body 22, and the mounting chamber 145. This achieves mutual communication between the main chamber 11 and the auxiliary chamber 12. At this time, the volume of the vibration cavity increases, resulting in lower stiffness and better comfort.

[0048] In summary, this invention utilizes a main chamber 11 and a secondary chamber 12 arranged vertically within the air spring assembly 1, and controls the connection or disconnection of the main chamber 11 and the secondary chamber 12 via a valve device 2. This allows the main chamber 11 and the secondary chamber 12 to jointly provide a damping cavity when they are connected, resulting in a relatively large damping cavity volume, low stiffness, and good comfort. Conversely, when the connection between the main chamber 11 and the secondary chamber 12 is disconnected, the main chamber 11 provides the damping cavity alone, resulting in a relatively small damping cavity volume, high stiffness, and good maneuverability. Furthermore, by connecting the top of the bladder 152 to the undulating piston 13 to form the main chamber 11, and sealing the bottom of the bladder 152 with the surface of the lower swing seat 14 corresponding to the air intake channel 141 to form the secondary chamber 12, a dual-cavity spring structure with both a main chamber 11 and a secondary chamber 12 is achieved using the bladder 152. Furthermore, the sealing installation between the bladder 152 and the lower swing seat 14 ensures that the bladder 152, corresponding to the secondary chamber 152, does not participate in shock absorption when the valve device 2 cuts off the connection. Moreover, the vertical distribution of the main chamber 11 and the secondary chamber 12 allows the air nozzle 3, mounted on top of the air spring assembly 1, to reach the piston chamber 131 with a shorter intake passage, thus shortening the air path during intake and reducing the structural complexity of the dual-cavity spring structure. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial applicability.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A dual-cavity air spring structure, characterized in that, include: An air spring assembly (1) is provided with a main chamber (11) and a secondary chamber (12). The main chamber (11) is located above the secondary chamber (12), and the main chamber (11) and the secondary chamber (12) are separated from each other. A valve device (2) is installed between the main chamber (11) and the auxiliary chamber (12) to control the connection and disconnection of the main chamber (11) and the auxiliary chamber (12). When the connection is established, the main chamber (11) and the auxiliary chamber (12) jointly provide a damping cavity. When the connection is disconnected, the main chamber (11) alone provides the damping cavity. as well as Air nozzle (3), one end of which is connected to the outside and the other end of which is connected to the main chamber (11); The air spring assembly (1) includes: a undulating piston (13), a lower pivot seat (14), and a bladder assembly (15). A piston chamber (131) is provided on one side of the bottom of the undulating piston (13), and the air nozzle (3) is installed on the top of the undulating piston (13). The lower swing seat (14) is located below the undulating piston (13), the valve device (2) is installed in the middle of the lower swing seat (14), and the lower swing seat (14) has several sets of air intake channels (141) circumferentially arranged on its side; and The bladder assembly (15) is cylindrical in shape. The bladder assembly (15) passes through the lower outer surface of the lower end of the lower swing seat (14) to the lower outer surface of the undulating piston (13), so that the main chamber (11) is formed between the piston chamber (131), the bladder assembly (15) and the top of the lower swing seat (14), and the secondary chamber (12) is formed between the air intake channel (141) and the bladder assembly (15) at the corresponding position. The bladder assembly (15) includes a bladder (152), the top of which is sealed to the outer surface of the lower end of the undulating piston (13), and the lower end of which is sealed to the outer surface of the lower swing seat (14) on the upper and lower sides of the air intake channel (141). The portion of the bladder (152) located between the top of the undulating piston (13) and the lower swing seat (14) constitutes part of the cavity wall of the main chamber (11), and the portion of the bladder (152) located outside the air intake channel (141) and between the two sealed connection positions constitutes part of the cavity wall of the secondary chamber (12).

2. The dual-cavity air spring structure according to claim 1, characterized in that: The skin assembly (15) also includes: A support ring (151) is located between the undulating piston (13) and the lower swing seat (14), and the middle portion of the bladder (152) is mounted on the support ring (151); and A bladder guide sleeve (153) is fitted onto the outer surface of the bladder (152), and the lower end of the bladder guide sleeve (153) extends out from the bottom side of the support ring (151).

3. The dual-cavity air spring structure according to claim 2, characterized in that: One end of the bladder (152) is pressed against the lower outer surface of the undulating piston (13) by the first pressure ring (154). The bladder (152) extended by the first pressure ring (154) is rolled up in an "S" shape and connected to the lower swing seat (14) to form the main chamber (11).

4. The dual-cavity air spring structure according to claim 2, characterized in that: The outer surfaces of the sacs (152) corresponding to the upper and lower sides of the sub-chamber (12) are respectively fitted with second pressure rings (155).

5. The dual-cavity air spring structure according to claim 4, characterized in that: The air spring assembly (1) further includes a dust cover assembly (16), the top of which is connected to the top surface of the undulating piston (13), and the bottom of which is connected to the top outer surface of the lower swing seat (14).

6. The dual-cavity air spring structure according to claim 5, characterized in that: The dust cover assembly (16) includes: A dust cover mounting pad (161) is fitted in the middle onto the top of the undulating piston (13); Clamp (162), the clamp (162) corresponding to the outer surface of the second pressure ring (155) of the top set; and The dust cover (163) is connected at its upper end to the outer ring of the dust cover mounting pad (161) and at its lower end to the clamp (162). The dust cover (163) is a corrugated cover.

7. The dual-cavity air spring structure according to claim 1, characterized in that: The valve device (2) is a solenoid valve.

8. The dual-cavity air spring structure according to claim 1, characterized in that: The lower seat (14) has an installation chamber (145) in the middle that corresponds to the valve device (2). The top of the installation chamber (145) is connected to the main chamber (11). The top of the installation chamber (145) is connected to the air intake channel (141) through the valve device (2).

9. The dual-cavity air spring structure according to claim 8, characterized in that: The valve device (2) includes: A valve seat (21) is mounted on the top inner wall of the mounting chamber (145). An air inlet (212) is provided in the middle of the valve seat (21). A first sealing ring (211) is provided between the outer wall of the valve seat (21) and the top inner wall of the mounting chamber (145) to seal the space between the outer wall of the valve seat (21) and the top inner wall of the mounting chamber (145). An electric valve body (22) is disposed below the valve seat (21). The lower outer wall of the valve seat (21) is inserted into the bottom inner wall of the mounting chamber (145). A second sealing ring (221) is provided between the lower outer wall of the valve seat (21) and the bottom inner wall of the mounting chamber (145) to seal the lower outer wall of the valve seat (21) and the bottom inner wall of the mounting chamber (145). The first sealing ring (211) and the second sealing ring (221) are located on the upper and lower sides of the air intake channel (141), respectively.

10. The dual-cavity air spring structure according to claim 4, characterized in that: The lower seat (14) includes: The upper swing seat (142) has a first corrugated protrusion on its outer surface that corresponds to the second pressure ring (155) of the top group; A lower hem seat (143), located below the upper hem seat (142), has a second corrugated protrusion on its outer surface corresponding to the second pressure ring (155) of the bottom set; and A support member (144) is vertically connected between the upper swing seat (142) and the lower swing seat (143) to form the air intake channel (141).

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