Air spring and vehicle thereof

Abstract

The utility model relates to the technical field of vehicles, in particular to an air spring and a vehicle thereof. The air spring comprises an air bag, a piston seat, a piston and an elastic element, an air cavity is formed in the air bag, the piston seat is installed on the air bag, and a piston cavity communicated with the air cavity is formed in the piston seat; the piston is mounted in the piston cavity and divides the piston cavity into a first chamber and a second chamber which are not communicated with each other, and the first chamber is communicated with the air bag; the elastic element is installed in the second cavity, one end of the elastic element is limited to the piston, and the other end is limited to the piston seat. And the piston can respond to the change of the pressure in the air cavity to move in the piston cavity so as to compress the elastic element and change the volume of the first cavity. A vehicle includes an air spring. According to the air spring, the rigidity of the air spring can be slowly increased or decreased, and the overall comfort performance is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an air spring and a vehicle thereof. Background Art

[0002] Air springs use the compressibility of gas to achieve their elastic effect. Air springs have functions such as buffering and vibration isolation. Suspension systems equipped with air springs have better driving smoothness and riding comfort than general suspensions. If the stiffness of the air springs is properly adjusted during driving, the suspension system can be reasonably matched with the performance of the vehicle.

[0003] The stiffness of an air spring is related to its volume. When other conditions are the same, the smaller the volume, the greater the stiffness. Existing variable stiffness air spring technology uses this feature, for example, by setting two or more chambers and changing the volume by using the connectivity between the chambers. However, this adjustment does not have a linear change, resulting in poor precision in adjusting the stiffness of the air spring. Utility Model Content

[0004] Based on this, it is necessary to provide an air spring and a vehicle thereof that can adjust the stiffness more accurately.

[0005] In order to solve the above technical problems, the first aspect of the present application provides the following technical solutions:

[0006] An air spring comprises an air bag, a piston seat, a piston and an elastic element, wherein an air cavity is formed in the air bag, the piston seat is mounted on the air bag, and a piston cavity connected to the air cavity is formed on the piston seat; the piston is mounted in the piston cavity and divides the piston cavity into a first chamber and a second chamber which are not connected to each other, and the first chamber is connected to the air bag; the elastic element is mounted in the second chamber, and one end of the elastic element is limited to the piston, and the other end is limited to the piston seat; wherein the piston can move in the piston cavity in response to changes in the pressure in the air cavity to compress the elastic element and change the volume of the first chamber.

[0007] In one embodiment, the elastic element is installed in the second chamber in a pre-compressed manner.

[0008] This arrangement enables the piston to move only after overcoming the pre-compression force of the elastic element. That is, through this pre-compression method, the timing of piston movement can be accurately adjusted to control the change of air pressure inside the air cavity of the air spring at a preset position, thereby changing the stiffness of the air spring at that position, further improving the accuracy of air spring adjustment and the comfort of use.

[0009] In one embodiment, in the second chamber, a first limiting portion is provided on the piston seat, a second limiting portion is provided on the piston, and both ends of the elastic element are limited to the first limiting portion and the second limiting portion respectively.

[0010] Such an arrangement can prevent the elastic element from moving during compression, thereby improving the stability of the movement of the elastic element.

[0011] In one embodiment, the first limiting portion is configured as a limiting groove or a limiting protrusion; and / or the second limiting portion is configured as a limiting groove or a limiting protrusion.

[0012] In one embodiment, the first limiting portion is configured as a limiting protrusion, and along the axis direction of the piston cavity, the limiting protrusion protrudes from the cavity wall of the second cavity toward the piston.

[0013] In one embodiment, a sealing member is provided between the outer peripheral wall of the piston and the cavity wall of the piston cavity, so as to seal the gap between the outer peripheral wall of the piston and the cavity wall of the piston cavity through the sealing member.

[0014] In one embodiment, a balancing hole is provided on the piston seat, one end of the balancing hole is connected to the second chamber, and the other end is used to connect to the external air pressure.

[0015] In this arrangement, the balancing hole is used to balance the air pressure in the second chamber and the outside, thereby preventing the closed second chamber from affecting the compression of the elastic element, thereby affecting the volume change between the first chamber and the second chamber, and further avoiding affecting the air pressure change value in the air cavity, thereby further improving the accuracy of air spring adjustment.

[0016] In one embodiment, a limiting member is further provided on the piston seat. The limiting member is located at a position where the piston cavity is connected to the air cavity and can form a limiting fit with the piston.

[0017] With such arrangement, the piston is limited by the limiting member, thereby preventing the piston from being separated from the piston seat.

[0018] In one embodiment, the piston seat is further provided with an inflation hole, and the inflation hole is connected to the air cavity.

[0019] The second aspect of the present application provides the following technical solutions:

[0020] A vehicle comprises the air spring in any one of the above embodiments.

[0021] Compared with the prior art, the air spring and its vehicle are provided with an elastic element, and it can be known from Hooke's law F=kx that after the elastic element is set, k is a constant (fixed value); at the same time, the force f=ps that pushes the piston to move in the piston cavity, p is the pressure, and s is the force area of ​​the piston. It can be seen that s is a fixed value, and the compression value of x is proportional to the difference between F and f, that is, the change between the first chamber and the second chamber is linear. Therefore, the change in the air cavity can be adjusted more accurately, so that the volume change of the air spring is reduced (it will not increase or decrease suddenly), and the stiffness slowly increases or decreases, thereby improving comfort. Secondly, since an elastic element is used, the movement of the piston needs to overcome the elastic force of the elastic element. Therefore, the timing of the change of the first chamber and the second chamber can be controlled by the elastic element. If the air pressure inside the air spring when the piston moves is called the starting air pressure, the starting air pressure can be adjusted according to demand; that is, it is opened at a certain position of the up or down jump, which can change the stiffness performance of the air spring and make the stiffness adjustment more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the top view of the air spring provided in this application.

[0024] Figure 2 Provided for this application Figure 1 Sectional view at AA.

[0025] Figure 3 Provided for this application Figure 2 A partial enlarged view of point B in the middle.

[0026] The reference numerals of the components are as follows:

[0027] 100. Air spring; 10. Air bag; 11. Air cavity; 12. Base; 20. Piston seat; 21. Piston cavity; 211. First chamber; 212. Second chamber; 213. Mounting groove; 22. First limiting part; 23. Balance hole; 24. Limiting member; 25. Inflating hole; 30. Piston; 31. Second limiting part; 32. Sealing member; 33. Sealing groove; 40. Elastic element; 50. Casing; 60. Dust cover. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0033] See also Figure 1 and Figure 2The present application provides an air spring 100, which is mainly used to adjust the hardness and softness of the suspension system so that the suspension system can adapt to different environments and provide better comfort. Here, one end of the air spring 100 is connected to the vehicle frame, and the other end is connected to the wheel swing arm. In this way, the impact, vibration, etc. transmitted by the wheel are absorbed or reduced through the compression and recovery of the air spring 100.

[0034] Specifically, the air spring 100 includes an airbag 10, a piston seat 20, a piston 30 and an elastic element 40. An air cavity 11 is formed in the airbag 10, the piston seat 20 is mounted on the airbag 10, and a piston cavity 21 connected to the air cavity 11 is opened on the piston seat 20; the piston 30 is mounted in the piston cavity 21 and divides the piston cavity 21 into a first chamber 211 and a second chamber 212 which are not connected to each other, and the first chamber 211 is connected to the airbag 10; the elastic element 40 is mounted in the second chamber 212, and one end of the elastic element 40 is limited to the piston 30, and the other end is limited to the piston seat 20; wherein the piston 30 can move in the piston cavity 21 in response to the change of the pressure in the air cavity 11, so as to compress the elastic element 40 and change the volume of the first chamber 211.

[0035] It can be understood that by setting the elastic element 40, and from Hooke's law F=kx, it can be known that after the elastic element 40 is set, k is a constant (fixed value); at the same time, the force f=ps that pushes the piston 30 to move in the piston chamber 21, p is the pressure, and s is the force area of ​​the piston 30. It can be seen that s is a fixed value, and the compression value of x is proportional to the difference between F and f, that is, the change between the first chamber 211 and the second chamber 212 is linear. Therefore, the change in the air cavity 11 will not increase or decrease suddenly, and can be adjusted more accurately, so that the volume change of the air spring 100 is reduced, the stiffness slowly increases or decreases, and the comfort is improved. Secondly, since an elastic element 40 is used, the movement of the piston 30 needs to overcome the elastic force of the elastic element 40. Therefore, the timing of the change of the first chamber 211 and the second chamber 212 can be controlled by the elastic element 40. The air pressure inside the air spring 100 when the piston 30 moves is called the starting air pressure, and the starting air pressure can be adjusted according to demand; that is, it is opened at a certain position of the up or down jump, which can change the stiffness performance of the air spring 100, so that the stiffness adjustment of the air spring 100 is more precise.

[0036] In one embodiment, the airbag 10 is generally made of a flexible material, wherein the flexible material may be rubber, flexible plastic, etc.

[0037] Along the axial direction of the airbag 10, both ends of the airbag 10 are provided with openings, and both openings are connected to the air chamber 11. The piston seat 20 is sealed and fixed to the airbag 10 through one of the openings. The other opening is used to fix the base 12. Here, the base 12 is used to be fixed on the wheel swing arm. The piston seat 20 is connected to the vehicle body. When the wheel swing arm is forced to swing, it will compress or stretch the airbag 10, thereby absorbing or reducing the impact and vibration transmitted by the wheel.

[0038] Please continue to refer to Figure 2 In the second chamber 212, the piston seat 20 is provided with a first limiting portion 22, the piston 30 is provided with a second limiting portion 31, and both ends of the elastic element 40 are respectively limited to the first limiting portion 22 and the second limiting portion 31. In this way, the elastic element 40 can be prevented from moving during the compression process, and the stability of the movement of the elastic element 40 is improved.

[0039] Specifically, the first limiting portion 22 is configured as a limiting groove or a limiting protrusion; and / or the second limiting portion 31 is configured as a limiting groove or a limiting protrusion. In other words, the first limiting portion 22 can be a limiting groove, and the second limiting portion 31 is also a limiting groove; or, the first limiting portion 22 is configured as a limiting protrusion, and the second limiting portion 31 is configured as a limiting groove, etc., which are not exhaustive here.

[0040] In this embodiment, the first limiting portion 22 is configured as a limiting protrusion. In addition, along the axial direction of the piston cavity 21, the limiting protrusion is protruded from the cavity wall of the second cavity 212 toward the piston 30. The second limiting portion 31 is configured as a limiting groove, one end of the elastic element 40 is sleeved on the limiting protrusion, and the other end is received in the limiting groove, so that the elastic element 40 is fixed in position.

[0041] Please continue to refer to Figure 2 A balancing hole 23 is provided on the piston seat 20, one end of the balancing hole 23 is connected to the second chamber 212, and the other end is used to connect to the external air pressure. In this way, the balancing hole 23 is used to balance the air pressure of the second chamber 212 and the external air pressure, so as to avoid the closed second chamber 212 from affecting the compression of the elastic element 40, thereby affecting the volume change between the first chamber 211 and the second chamber 212, and further avoiding affecting the air pressure change value in the air cavity 11, and further improving the adjustment accuracy of the air spring 100. It should be explained that after the closed chamber is compressed, a vacuum will be formed as the internal air pressure is gradually compressed, and if a vacuum is formed, it will not be able to be compressed anymore, so the balancing hole 23 is provided here, so as to avoid the second chamber 212 from forming a vacuum and being unable to be compressed through the balancing hole 23.

[0042] In one embodiment, in order to prevent the piston 30 from being separated from the piston cavity 21, a limiting member 24 is further provided on the piston seat 20, and the limiting member 24 is located at a position where the piston cavity 21 is connected to the air cavity 11, and can form a limiting fit with the piston 30. In this way, the piston 30 is limited by the limiting member 24, thereby preventing the piston 30 from being separated from the piston seat 20.

[0043] Specifically, Figure 3 As shown, a mounting groove 213 is formed on the inner wall of the first chamber 211, and a portion of the limiting member 24 is fixed in the mounting groove 213 to achieve the installation of the limiting member 24; at the same time, another portion of the limiting member 24 protrudes from the cavity wall of the first chamber 211 along the radial direction of the first chamber 211 through the notch of the mounting groove 213 to form a limiting portion, and the outer peripheral wall of the piston 30 and the limiting portion can form a limiting fit at this position, thereby limiting the piston 30 from detaching from the piston cavity 21.

[0044] Preferably, the stopper 24 can be configured as a stopper ring or a protrusion. If the stopper 24 is configured as a protrusion, the number of protrusions can be multiple, and the multiple protrusions are arranged at intervals along the circumference of the first chamber 211, so that multiple stops can be formed on the circumference of the first chamber 211 to improve the reliability of the stopper for the piston 30.

[0045] Please continue to refer to Figure 2 The piston seat 20 is also provided with an air filling hole 25, which is connected to the air cavity 11 and is used to cooperate with an external air filling device to replenish gas in the air cavity 11. Here, when inflation is not required, the air filling hole 25 is generally sealed and blocked by a plug, a valve and other components to prevent the gas in the air cavity 11 from leaking through the air filling hole 25.

[0046] Please focus on Figure 2 A seal 32 is provided between the outer peripheral wall of the piston 30 and the inner cavity wall of the piston cavity 21, so as to seal the gap between the outer peripheral wall of the piston 30 and the inner cavity wall of the piston cavity 21 through the seal 32. In this way, the gas in the first chamber 211 or the gas cavity 11 is prevented from flowing to the second chamber 212.

[0047] Specifically, a sealing groove 33 is provided on the outer peripheral wall of the piston 30, and the sealing groove 33 is arranged around the circumference of the piston 30. A portion of the sealing member 32 is embedded in the sealing groove 33, and another portion protrudes from the outer peripheral wall of the piston 30 along the radial direction of the first chamber 211, and is sealed against the inner cavity wall of the first chamber 211, so as to achieve sealing between the outer peripheral wall of the piston 30 and the inner cavity wall of the piston cavity 21.

[0048] As preferably, the sealing member 32 can be configured as a rubber member or a silicone member. Here, the sealing member 32 is configured as a rubber ring or a silicone ring.

[0049] Please continue to refer to Figure 2 , the elastic coefficient of the elastic element 40 is a constant value, which satisfies Hooke's law. Here, the elastic element 40 can be set as a spiral spring or a component with elasticity, such as a polyurethane component, rubber, etc.

[0050] Furthermore, the elastic element 40 is installed in the second chamber 212 in a pre-compression manner. In this way, the movement of the piston 30 needs to overcome the pre-compression force of the elastic element 40 before it can move. That is, through this pre-compression method, the timing of the movement of the piston 30 can be accurately adjusted, and the change of the air pressure inside the air cavity 11 of the air spring 100 at a preset position can be controlled, thereby changing the stiffness of the air spring 100 at this position, and further improving the accuracy of the adjustment of the air spring 100 and the comfort of use. Here, pre-compression means compressing the elastic element 40 to a certain value before installing it, so that it is contained in the second chamber 212 in a compressed state.

[0051] Specifically, Figure 2As shown, the stiffness of the elastic element 40 and the amount of compression of the elastic element 40 by the piston 30 can determine the change trend of the stiffness curve of the air spring 100. The basic principle of the air spring 100 is: the internal air pressure of the air spring 100 acts on the piston 30 and generates an upward pressure on the piston 30, and at the same time, the piston 30 is subjected to the downward pressure of the elastic element 40. When the forces of the two are equal, the piston 30 is stationary and does not move; when the internal air pressure of the air spring 100 increases, the upward force on the piston 30 increases, and the piston 30 moves upward at this time. After the piston 30 moves upward, the elastic element 40 is further compressed. When the forces of the two are the same, the piston 30 is stationary, and the two are in dynamic balance; the pressure inside the air spring 100 when the piston 30 moves is called the starting air pressure, and the starting air pressure can be adjusted according to demand; opening at a certain position of the up and down jump can change the stiffness performance of the air spring 100; in this way, the elastic element 40 can make the air pressure of the air cavity 11 slowly rise or slowly fall during the movement of the air spring 100. At the same time, the smaller the pressure change of the air cavity 11 in the air spring 100, the more stable the air spring 100 is, and the difference between the maximum dynamic pressure and the minimum dynamic pressure affects the durability of the air spring 100. When the air spring 100 moves with large amplitude and high frequency, the air pressure changes rapidly, affecting the life of the air spring. Here, the maximum dynamic pressure is the maximum pressure during the working process of the air spring: that is, the air pressure when the fully loaded high-position air spring is compressed to the limit position; the minimum dynamic pressure is the minimum pressure during the working process of the air spring: that is, the air pressure when the unloaded low-position air spring is stretched to the limit position; and in the present application, the elastic element 40 is used to make the air pressure of the air cavity 11 rise or fall slowly, so that the maximum dynamic pressure of the air spring 100 will become smaller under the same conditions, and the dynamic minimum pressure will rise, the life of the air spring will increase, and the reliability will be improved.

[0052] Exemplarily, when the elastic element 40 is not provided inside the air spring and there is no piston chamber 21, the design volume of the air spring is: V (L), the pressure is: P, after the wheel jumps on the stroke of D (mm), the volume of the air spring after compression is: V1, the pressure is: P1, and the volume change is: △V1 = V-V1. Under the condition that other conditions remain unchanged, the air spring 100 of the present application is provided with an elastic element 40 and a piston chamber 21. After the wheel jumps on the stroke of D (mm), the volume of the air spring 100 after compression is V2, at which time the gas pressure is: P2, and the volume change is: △V2 = V-V2. As described above, when the pressure in the air chamber 11 increases to the opening pressure (starting pressure), the piston 30 moves upward, which will increase the volume swept by the piston 30, so △V1>△V2; according to the ideal gas state equation PV = nRT, it can be seen that P represents pressure, V represents volume, n represents the amount of gas substance, R is a constant, and T represents temperature. Therefore, for the same gas and at the same operating temperature, combined with the same volume and the same pressure, according to the ideal gas state equation, it can be known that the greater the change in gas volume, the greater the change in pressure, and the smaller the change in gas volume, the smaller the change in pressure. Since △V1>△V2, V1<V2, so P1>P2. Therefore, the stiffness of the air spring 100 provided in this application is less than the stiffness of the air spring without the elastic element 40 and the piston chamber 21, which can effectively buffer the force transmitted to the vehicle body when the wheel is subjected to a violent impact, thereby improving comfort.

[0053] Similarly, during the process of the wheel of the whole vehicle jumping down and stretching, the air spring 100 is stretched. During the stretching process, the volume of the air spring 100 increases, so its internal pressure will decrease; and as the internal pressure of the air spring 100 decreases, when the internal pressure of the air spring 100 is less than the elastic force of the elastic element 40, the elastic element 40 resets and pushes the piston 30 downward. Therefore, after the wheel jumps down by a stroke of D (mm), the elastic element 40 is not provided inside the air spring and there is no piston cavity 21, and its volume is V1, and the gas pressure at this time is: P1; and the volume stretched by the air spring 100 of the present application is V2, and the gas pressure at this time is: P2; due to the downward movement of the piston 30, V2 is actually equal to V1 minus the volume swept by the downward movement of the piston 30, therefore, V2<V1; therefore, according to the ideal gas state equation PV=nRT, it can be known that after the wheel jumps down by a stroke of D (mm), the internal pressure of the air spring 100 provided by the present application is greater than the internal pressure of the air spring without the elastic element 40 and without the piston cavity 21, that is, P2>P1; therefore, the stiffness of the air spring 100 provided by the present application is greater than the stiffness of the air spring without the elastic element 40 and without the piston cavity 21, that is, the supporting force of the air spring 100 provided by the present application is greater than the supporting force of the air spring without the elastic element 40 and without the piston cavity 21, so that the vehicle body is slowly lowered, the vehicle body can be effectively supported, and the comfort performance of the whole vehicle can be improved.

[0054] Further, when other conditions are consistent with the present application, the only difference is that: when the elastic element 40 is not provided inside the air spring, the movement of the piston 30 is only affected by the change of the air pressure inside the air cavity 11, and because the road surface state is uncertain, the change between the first chamber 211 and the second chamber 212 is irregular, so the air pressure in the air cavity 11 also changes irregularly, which leads to the irregular movement of the piston 30, so that the air pressure in the air cavity 11 will suddenly increase or decrease, and the comfort is poor. The air spring 100 in the present application is provided with an elastic element 40, and the movement of the piston 30 is also associated with the state of the elastic element 40. Since the elastic element 40 is a linear element, under the action of the elastic element 40, the change between the first chamber 211 and the second chamber 212 is linear, that is, the piston 30 will not jump suddenly. Therefore, the change in the air cavity 11 can be adjusted more accurately, so that the volume change in the air spring 100 will not suddenly increase or decrease, and then the stiffness will slowly increase or decrease, improving the comfort.

[0055] In summary, the air spring 100 provided in the present application can achieve a slow change in gas volume during movement, that is, the air pressure inside the air spring 100 slowly rises or slowly falls, thereby improving the overall comfort performance.

[0056] Please continue to refer to Figure 2 In addition to the above-mentioned components, the air spring 100 provided in the present application also includes a casing 50, a dust cover 60, a connecting assembly and other components, which work together to further realize the function of the air spring 100. Of course, the casing 50, the dust cover 60, the connecting assembly and other components are prior art and will not be described in detail here.

[0057] The present application also provides a vehicle, which includes the air spring 100 in any of the above embodiments. Here, the vehicle can be a car, a tricycle, a motorcycle, etc.

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An air spring, characterized in that: The air spring comprises an air bag (10), a piston seat (20), a piston (30) and an elastic element (40); an air cavity (11) is formed in the air bag (10); the piston seat (20) is mounted on the air bag (10); and a piston cavity (21) communicating with the air cavity (11) is formed on the piston seat (20); The piston (30) is installed in the piston chamber (21) and divides the piston chamber (21) into a first chamber (211) and a second chamber (212) which are not connected to each other, and the first chamber (211) is connected to the airbag (10); the elastic element (40) is installed in the second chamber (212), and one end of the elastic element (40) is limited to the piston (30) and the other end is limited to the piston seat (20); The piston (30) is capable of moving in the piston chamber (21) in response to changes in the pressure in the air chamber (11) to compress the elastic element (40) and change the volume of the first chamber (211).

2. The air spring according to claim 1, characterized in that: The elastic element (40) is installed in the second chamber (212) in a pre-compressed manner.

3. The air spring according to claim 1, characterized in that: In the second chamber (212), a first limiting portion (22) is provided on the piston seat (20), a second limiting portion (31) is provided on the piston (30), and two ends of the elastic element (40) are respectively limited by the first limiting portion (22) and the second limiting portion (31).

4. The air spring according to claim 3, characterized in that: The first limiting portion (22) is configured as a limiting groove or a limiting protrusion; and / or the second limiting portion (31) is configured as a limiting groove or a limiting protrusion.

5. The air spring according to claim 4, characterized in that: The first limiting portion (22) is configured as a limiting protrusion, and along the axial direction of the piston cavity (21), the limiting protrusion protrudes from the cavity wall of the second cavity (212) in the direction of the piston (30).

6. The air spring according to claim 1, characterized in that: The piston seat (20) is provided with a balancing hole (23), one end of the balancing hole (23) is connected to the second chamber (212), and the other end is used to connect to the external air pressure.

7. The air spring according to claim 1, characterized in that: A limiting member (24) is also provided on the piston seat (20). The limiting member (24) is located at a position where the piston cavity (21) is connected to the air cavity (11) and can form a limiting fit with the piston (30).

8. The air spring according to claim 1, characterized in that: The piston seat (20) is also provided with an air filling hole (25), and the air filling hole (25) is connected to the air cavity (11).

9. The air spring according to claim 1, characterized in that: A sealing member (32) is provided between the outer peripheral wall of the piston (30) and the cavity wall of the piston cavity (21), so as to seal the gap between the outer peripheral wall of the piston (30) and the cavity wall of the piston cavity (21) through the sealing member (32).

10. A vehicle, characterized in that: Comprising the air spring as described in any one of claims 1-9.

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