Air spring and vehicle

Abstract

The present invention relates to the technical field of vehicle shock absorption, and in particular, to an air spring and a vehicle. The air spring comprises a first connecting seat, a second connecting seat, an airbag assembly, a casing assembly and a protective cover assembly. One end of the airbag assembly is detachably connected to the first connecting seat, and the other end is detachably connected to the second connecting seat, and the airbag assembly is located inside the casing assembly. The first protective cover unit of the protective cover assembly is located between the two second protective cover units and is fixedly connected to them. The casing assembly is located inside the first protective cover unit. The protective cover assembly has a wavy wall in a cross section parallel to its own axis, and the spacing between adjacent wave peaks of the wall of the second protective cover unit is greater than the spacing between adjacent wave peaks of the wall of the first protective cover unit. The cavity between the protective cover assembly and the casing assembly is connected to the air hole, thereby solving the problem that the protective cover of the air spring is easily damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle shock absorption, and in particular to an air spring and a vehicle. Background Art

[0002] An air spring is a spring that utilizes the elasticity of air, held in a retractable, sealed container filled with compressed air. Air springs exhibit ideal nonlinear elastic properties. Compared to widely used hydraulic shock absorbers, air springs offer a wider damping range and greater tolerance in automotive suspension systems. Consequently, they are increasingly used in vehicles. However, as a crucial component of vehicle suspension systems, air springs are often exposed to harsh road conditions and environments, making them susceptible to attack by debris such as dust and sand, which can damage and malfunction the air springs. Therefore, protective covers are required to protect the air springs from contamination or damage.

[0003] Air spring protective covers are mostly split or integrated. Split protective covers are divided into two parts, the upper and lower parts, leaving the casing free to avoid interference, making installation and maintenance more complicated. Although integrated protective covers are easy to install, they are prone to friction with the casing during the extension and retraction process, which can damage the protective cover and fail to protect the air spring from contamination or damage. Summary of the Invention

[0004] In order to solve the problem that an air spring protective cover is easily damaged, the present invention provides an air spring and a vehicle.

[0005] In a first aspect, the present invention provides an air spring, comprising:

[0006] a first connecting seat and a second connecting seat, wherein a distance is provided between the first connecting seat and the second connecting seat; and a plurality of air holes are provided on the second connecting seat;

[0007] An airbag assembly, wherein the airbag assembly is cylindrical; one end of the airbag assembly is detachably connected to the first connecting seat; and the other end of the airbag assembly is detachably connected to the second connecting seat;

[0008] A casing assembly, the casing assembly is cylindrical; the casing assembly is coaxial with the airbag assembly; the airbag assembly is located inside the casing assembly; the airbag assembly and the casing assembly are detachably connected;

[0009] A protective cover assembly, the protective cover assembly includes a first protective cover unit and two second protective cover units; the first protective cover unit and the second protective cover unit are both cylindrical and coaxial; the first protective cover unit is located between the two second protective cover units; the first protective cover unit is fixedly connected to the second protective cover unit; the first protective cover unit is coaxial with the casing assembly; the casing assembly is located inside the first protective cover unit; one of the second protective cover units is detachably connected to the first connecting seat, and the other second protective cover unit is detachably connected to the second connecting seat; the protective cover assembly has a wavy wall in a cross section parallel to its own axis; the distance between adjacent wave peaks of the wall of the second protective cover unit is greater than the distance between adjacent wave peaks of the wall of the first protective cover unit; the cavity between the protective cover assembly and the casing assembly is connected to the air hole.

[0010] In some embodiments, the hardness of the first protective cover unit is less than the hardness of the second protective cover unit.

[0011] In some embodiments, a thickness of the first protective cover unit is smaller than a thickness of the second protective cover unit.

[0012] In some embodiments, the second protective cover unit includes a protective cover portion and several transition rings; the protective cover portion is cylindrical; the cylindrical wall of the protective cover portion is wavy; the protective cover portion is integrally formed with the first protective cover unit; the transition rings correspond one-to-one with the wave crests on the outer side of the cylindrical wall of the protective cover portion; the transition rings are located at the corresponding wave crest positions of the protective cover portion; the transition rings are integrally formed with the protective cover portion; in a cross section of the second protective cover unit parallel to its own axis, the circumferential wall of the transition ring is an inwardly concave arc.

[0013] In some embodiments, in a radial projection of the air spring along the sleeve assembly, an axial length of the sleeve assembly covered by the first protective cover unit is at least greater than 80% of the axial length of the sleeve assembly.

[0014] In some embodiments, the airbag assembly includes a first airbag unit, a second airbag unit, and a protrusion unit; the first airbag unit and the second airbag unit are both cylindrical; the first airbag unit is located inside the second airbag unit; the end of the first airbag unit facing away from the second connecting seat and the end of the second airbag unit facing away from the second connecting seat are integrally formed; the end of the first airbag unit facing the second connecting seat is detachably connected to the first connecting seat; the end of the second airbag unit facing the second connecting seat is detachably connected to the second connecting seat; the protrusion unit is annular; the protrusion unit is integrally formed with the second airbag unit; the protrusion unit protrudes from the outer circumferential wall of the second airbag unit;

[0015] The air spring further includes a piston; the piston is cylindrical; a portion of the first connecting seat is disposed inside the piston; the piston and the first connecting seat are detachably connected; the piston is coaxial with the first airbag unit, and the piston is fitted between the first airbag unit and the first connecting seat;

[0016] The casing assembly includes a casing unit and a recessed unit; the casing unit is cylindrical; the recessed unit is annular; the recessed unit and the casing unit are integrally formed; the recessed unit is recessed on the inner circumferential wall of the casing unit; the protruding unit is located in the recessed unit.

[0017] In some embodiments, the distance from one end of the casing unit away from the second connecting seat to the second connecting seat is a first distance; the distance from one end of the first airbag unit away from the second connecting seat to the second connecting seat is a second distance; the first distance is greater than the second distance.

[0018] In some embodiments, the casing assembly further includes a connecting ring; the connecting ring is located at one end of the casing unit facing the second connecting seat; the connecting ring is located on the outside of the casing unit; the connecting ring is integrally formed with the casing unit.

[0019] In some embodiments, the airbag assembly also includes a third airbag unit; the third airbag unit is annular and coaxial with the second airbag unit; the second airbag unit is integrally formed with the third airbag unit at one end close to the second connecting seat; in the cross-section of the third airbag unit parallel to its own axis, the circumferential wall of the third airbag unit is arc-shaped; the maximum inner diameter of the third airbag unit is larger than the inner diameter of the second airbag unit; the connecting ring is located at the connection between the second airbag unit and the third airbag unit.

[0020] In a second aspect, the present invention provides a vehicle, comprising the air spring according to any one of the first aspects, and further comprising:

[0021] a vehicle body, wherein the first connecting seat in the air spring is detachably connected to the vehicle body;

[0022] Suspension, the second connecting seat in the air spring is detachably connected to the suspension.

[0023] In order to solve the problem that the air spring protective cover is easily damaged, the present invention has the following advantages:

[0024] 1. The integrated protective cover is divided into three sections. The peak gap between the middle section is smaller than that between the upper and lower sections. Therefore, it is easy to deform when subjected to vertical loads. Therefore, when the air spring expands and contracts, the middle section of the protective cover will expand and contract first, thus achieving the effect of synchronous lifting and lowering with the casing. The relative movement between the protective cover and the casing is reduced, thereby reducing friction and extending the service life of the protective cover.

[0025] 2. By utilizing the difference in the size of the peak gaps in different sections of the protective cover, the air spring shock absorption function is adjusted, so that the middle section of the protective cover first expands and contracts as the first-level buffer, while the upper and lower end protective covers serve as the second-level buffer, thereby improving the vehicle's shock absorption performance.

[0026] 3. The protective cover and the sleeve can be operated synchronously, and the gap between the two to prevent interference can be reduced, thereby reducing the size of the protective cover and saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 shows a schematic cross-sectional view of an air spring according to a first embodiment of the present invention;

[0028] Figure 2 A partial enlarged view of the air spring according to the first embodiment of the present invention is shown;

[0029] Figure 3 A front view of an air spring according to a first embodiment of the present invention is shown;

[0030] Figure 4 A top view of an air spring according to a first embodiment of the present invention is shown;

[0031] Figure 5 A schematic diagram of a vehicle is shown according to a second embodiment of the present invention.

[0032] Figure numerals: 10 first connecting seat; 20 second connecting seat; 21 air hole; 30 airbag assembly; 31 first airbag unit; 32 second airbag unit; 33 third airbag unit; 34 protrusion unit; 40 casing assembly; 41 casing unit; 42 recessed unit; 43 connecting ring; 50 protective cover assembly; 51 first protective cover unit; 52 second protective cover unit; 521 protective cover part; 522 transition ring; 60 piston; 70 vehicle body; 80 suspension. DETAILED DESCRIPTION

[0033] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0034] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0035] Air springs used in automotive suspension systems are ideal shock absorbers. However, since they are installed under the vehicle, they are susceptible to damage and malfunction due to debris such as dust, sand, and mud. Therefore, a protective cover must be installed outside the air spring. Common types of air spring covers are split and integrated. Split covers, consisting of two parts, are complex to install and maintain. While integrated covers are simple to install, they can easily rub against the casing during expansion and contraction, causing damage.

[0036] In this embodiment, an air spring is provided, such as Figure 1 As shown, the air spring may include a first connecting seat 10 , a second connecting seat 20 , an airbag assembly 30 , a sleeve assembly 40 and a protective cover assembly 50 .

[0037] There is a gap between the first connecting seat 10 and the second connecting seat 20, which can support and position the air spring. Figure 4 As shown, a plurality of air holes 21 are formed on the second connecting seat 20 .

[0038] like Figure 1 As shown, the airbag assembly 30 can be cylindrical, one end of the airbag assembly 30 can be detachably connected to the first connecting seat 10, and the other end of the airbag assembly 30 can be detachably connected to the second connecting seat 20.

[0039] The casing assembly 40 cooperates with the airbag assembly 30. The casing assembly 40 may be cylindrical and coaxial with the airbag assembly 30. The airbag assembly 30 is located inside the casing assembly 40 and is detachably connected to the casing assembly 40. The casing assembly 40 is sleeved outside the airbag assembly 30 to serve as a guide, preventing radial deformation of the airbag assembly 30 during inflation or deflation, thereby improving stability during deformation.

[0040] The protective cover assembly 50 includes a first protective cover unit 51 and two second protective cover units 52. The first protective cover unit 51 and the second protective cover unit 52 are both cylindrical and coaxial. The first protective cover unit 51 is located between the two second protective cover units 52 and is fixedly connected to the second protective cover units 52. The first protective cover unit 51 is coaxial with the casing assembly 40, and the casing assembly 40 is located inside the first protective cover unit 51. One of the second protective cover units 52 is detachably connected to the first connecting seat 10, and the other second protective cover unit 52 is detachably connected to the second connecting seat 20. The protective cover assembly 50 has a wavy wall along a cross section parallel to its own axis. The distance between adjacent wave peaks of the wall of the second protective cover unit 52 is greater than the distance between adjacent wave peaks of the wall of the first protective cover unit 51. As a result, the waves on the wall of the first protective cover unit 51 are denser in a natural state, making it easier for the first protective cover unit 51 to deform when subjected to vertical loads. Therefore, when the air spring expands and contracts, the first protective cover unit 51 will expand and contract first compared to the second protective cover unit 52, thereby achieving the effect that the first protective cover unit 51 and the protective tube assembly 40 tend to rise and fall synchronously, that is, reducing the relative movement of the protective cover assembly 50 and the protective tube assembly 40, thereby reducing friction and increasing service life.

[0041] Furthermore, after the first shield unit 51 reaches a certain expansion and contraction value, the second shield unit 52 also begins to expand and contract, achieving secondary cushioning and improving the vehicle's shock absorption performance to a certain extent. The cavity between the shield assembly 50 and the casing assembly 40 is connected to the air hole 21. This ensures that the cavity between the shield assembly 50 and the casing assembly 40 remains consistent with atmospheric pressure during air spring expansion and contraction, thereby enabling the shield assembly 50 to freely expand and contract. Furthermore, the highly synchronized movement of the first shield unit 51 and the casing assembly 40 reduces friction, allowing them to fit more closely together. This reduces the volume of the cavity between the shield assembly 50 and the casing assembly 40, thereby reducing the size of the shield assembly 50 and saving material.

[0042] In some embodiments, as Figure 1 and Figure 3 As shown, the hardness of the first protective cover unit 51 can be less than that of the second protective cover unit 52. When the vehicle vibrates and the air spring expands and contracts to provide cushioning, the first protective cover unit 51 expands and contracts before the second protective cover unit 52. The fact that the first protective cover unit 51 has a lower hardness than the second protective cover unit 52 makes it easier for the first protective cover unit 51 to deform than the second protective cover unit 52, thereby improving the synchronization between the first protective cover unit 51 and the casing unit 41, thereby reducing friction and increasing the service life of the protective cover.

[0043] In some embodiments, as Figure 1 and Figure 3 As shown, the thickness of the first protective cover unit 51 can be smaller than that of the second protective cover unit 52. When the vehicle vibrates and the air spring expands and contracts to provide cushioning, the first protective cover unit 51 expands and contracts before the second protective cover unit 52. The smaller thickness of the first protective cover unit 51 than the second protective cover unit 52 allows the first protective cover unit 51 to deform more easily than the second protective cover unit 52, thereby improving the synchronization between the first protective cover unit 51 and the casing unit 41, thereby reducing friction and increasing the service life of the protective cover.

[0044] In some embodiments, as Figure 1 and Figure 2As shown, the second shield unit 52 may include a shield portion 521 and several transition rings 522. The shield portion 521 is cylindrical, with a wavy wall. The shield portion 521 is integrally formed with the first shield unit 51. When the air spring expands and contracts, the shield portion 521 begins to expand and contract after the first shield unit 51 has expanded and contracted to a certain extent. The transition rings 522 correspond one-to-one with the wave crests on the outer side of the shield portion 521 and are located at the corresponding wave crests of the shield portion 521. The transition rings 522 are integrally formed with the shield portion 521. In a cross-section of the second shield unit 52 parallel to its axis, the circumferential wall of the transition ring 522 is in an inwardly concave arc shape. When the second shield expands and contracts, stress concentration occurs at the wave crests. The design of the transition rings 522 alleviates this stress concentration, thereby reducing damage to the second shield during reciprocating deformation. Furthermore, the transition rings 522 are located on the outer side of the second shield unit 52, making them easier to process.

[0045] In some embodiments, as Figure 1 As shown, in the radial projection of the air spring along the sleeve assembly 40, the axial length of the sleeve assembly 40 covered by the first protective cover unit 51 is at least greater than 80% of the axial length of the sleeve assembly 40. The first protective cover unit 51 substantially covers the sleeve assembly 40, and the first protective cover and the sleeve assembly 40 maintain nearly identical alignment during deformation and movement. This reduces the area where relative friction occurs between the protective cover assembly 50 and the sleeve assembly 40, i.e., the area where the second protective cover assembly 50 and the sleeve assembly 40 engage, thereby increasing the service life of the protective cover.

[0046] In some embodiments, as Figure 1 As shown, the airbag assembly 30 includes a first airbag unit 31, a second airbag unit 32, and a protrusion unit 34. Both the first airbag unit 31 and the second airbag unit 32 are cylindrical. The first airbag unit 31 is located inside the second airbag unit 32. The end of the first airbag unit 31 facing away from the second connecting seat 20 is integrally formed with the end of the second airbag unit 32 facing away from the second connecting seat 20. The end of the first airbag unit 31 facing the second connecting seat 20 is detachably connected to the first connecting seat 10, and the end of the second airbag unit 32 facing the second connecting seat 20 is detachably connected to the second connecting seat 20. The protrusion unit 34 can be annular and is integrally formed with the second airbag unit 32 and protrudes from the outer circumferential wall of the second airbag unit 32.

[0047] The air spring also includes a piston 60, which is cylindrical. Part of the first connecting seat 10 is inserted into the interior of the piston 60, and the piston 60 is detachably connected to the first connecting seat 10. The piston 60 is coaxial with the first airbag unit 31, and the piston 60 fits between the first airbag unit 31 and the first connecting seat 10. When the car vibrates, the first connecting seat 10 will rise or fall accordingly, and the piston 60 will also slide up and down. The airbag assembly 30 cushions and eliminates the impact force by inflating and deflating. In this process, the first airbag unit 31 will move up and down, and the piston 60 abutting against the first airbag unit 31 can play a guiding role, making the first airbag unit 31 less prone to radial deformation, thereby improving the stability of lifting and lowering.

[0048] The casing assembly 40 includes a casing unit 41 and a recessed unit 42. The casing unit 41 is cylindrical, while the recessed unit 42 is annular. The recessed unit 42 and casing unit 41 are integrally formed. The recessed unit 42 is recessed in the inner circumferential wall of the casing unit 41, and the raised unit 34 is located within the recessed unit 42. When the second airbag unit 32 is raised or lowered, the casing unit 41 is raised or lowered due to the engagement between the raised unit 34 and the recessed unit 42. The casing assembly 40 acts as a guide, preventing radial deformation of the second airbag unit 32 and improving lifting stability. Furthermore, the combination of the raised unit 34 and the recessed unit 42 enables a detachable connection between the casing unit 41 and the second airbag unit 32, facilitating quick installation.

[0049] In some embodiments, as Figure 1 As shown, the distance from the end of the casing unit 41 away from the second connecting seat 20 to the second connecting seat 20 is a first distance, and the distance from the end of the first airbag unit 31 away from the second connecting seat 20 to the second connecting seat 20 is a second distance. The first distance can be greater than the second distance, that is, the upper end of the casing unit 41 is higher than the upper end of the airbag assembly 30, so that the deformation of the airbag occurs within the casing, radial deformation is not easily caused, and stable expansion and contraction is achieved.

[0050] In some embodiments, as Figure 1As shown, the casing assembly 40 also includes a connecting ring 43. The connecting ring 43 is located at the end of the casing unit 41 facing the second connecting seat 20, and is located outside the casing unit 41, making it easy to manufacture. The connecting ring 43 is annular and integrally formed with the casing unit 41, with a smooth transition between the two. When the casing assembly 40 is mounted on the airbag assembly 30, the connecting ring 43 is mounted starting from the connection between the first airbag unit 31 and the second airbag unit 32, until it reaches the end of the second airbag unit 32 near the second connecting seat 20. Because the connecting ring 43 has a larger diameter than the second airbag unit 32, the connection between the first and second airbag units 31, 32 can be easily inserted into the connecting ring 43. Therefore, the design of the connecting ring 43 makes installation between the casing assembly 40 and the airbag assembly 30 more convenient and reduces interference.

[0051] In some embodiments, as Figure 1 As shown, the airbag assembly 30 may also include a third airbag unit 33. The third airbag unit 33 is annular and coaxial with the second airbag unit 32. The end of the second airbag unit 32 close to the second connecting seat 20 is integrally formed with the third airbag unit 33. In a cross section parallel to the axis of the third airbag unit 33, the circumferential wall of the third airbag unit 33 is arc-shaped. The maximum inner diameter of the third airbag unit 33 is greater than the inner diameter of the second airbag unit 32. The connecting ring 43 is located at the connection between the second airbag unit 32 and the third airbag unit 33. When the airbag assembly 30 is extended or retracted, the third airbag unit 33 can support the connecting ring 43 to rise and fall together, thereby improving the synchronization of the rise and fall of the casing unit 41 and the airbag assembly 30 and the stability of the connection.

[0052] It should be understood that the air spring in the present invention may be a rear air spring in an automobile.

[0053] In a second embodiment of the present invention, a vehicle is provided. The vehicle includes the air spring of the first embodiment, such as Figure 5 As shown, the vehicle may further include a body 70 and a suspension 80. The first connecting seat 10 of the air spring is detachably connected to the body 70, and the second connecting seat 20 of the air spring is detachably connected to the suspension 80. The air spring is located between the body 70 and the suspension 80 to mitigate the impact force generated by the relative movement of the body 70 when the body 70 vibrates, thereby ensuring smooth operation of the vehicle.

[0054] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. An air spring, characterized in that: The air spring comprises: A first connecting seat and a second connecting seat, wherein a distance is provided between the first connecting seat and the second connecting seat; and a plurality of air holes are provided on the second connecting seat; An airbag assembly, wherein the airbag assembly is cylindrical; one end of the airbag assembly is detachably connected to the first connecting seat; and the other end of the airbag assembly is detachably connected to the second connecting seat; A casing assembly, the casing assembly is cylindrical; the casing assembly is coaxial with the airbag assembly; the airbag assembly is located inside the casing assembly; the airbag assembly is detachably connected to the casing assembly; A protective cover assembly, the protective cover assembly comprises a first protective cover unit and two second protective cover units; the first protective cover unit and the second protective cover unit are both cylindrical and coaxial; the first protective cover unit is located between the two second protective cover units; the first protective cover unit is fixedly connected to the second protective cover unit; the first protective cover unit is coaxial with the casing assembly; the casing assembly is located inside the first protective cover unit; one of the second protective cover units is detachably connected to the first connecting seat, and the other second protective cover unit is detachably connected to the second connecting seat; the cylinder wall of the protective cover assembly along the cross section parallel to its own axis is wavy; the distance between adjacent wave peaks of the cylinder wall of the second protective cover unit is greater than the distance between adjacent wave peaks of the cylinder wall of the first protective cover unit; the cavity between the protective cover assembly and the casing assembly is connected to the air hole; The thickness of the first protective cover unit is smaller than the thickness of the second protective cover unit; In a radial projection of the air spring along the sleeve assembly, an axial length of the sleeve assembly covered by the first protective cover unit is at least greater than 80% of the axial length of the sleeve assembly.

2. An air spring according to claim 1, characterized in that: The hardness of the first protective cover unit is smaller than the hardness of the second protective cover unit.

3. An air spring according to claim 1, characterized in that: The second protective cover unit comprises a protective cover portion and a plurality of transition rings; the protective cover portion is cylindrical; the cylinder wall of the protective cover portion is wavy; the protective cover portion is integrally formed with the first protective cover unit; the transition ring corresponds to the wave crest on the outer side of the cylinder wall of the protective cover portion one by one; the transition ring is located at the corresponding wave crest position of the protective cover portion; the transition ring is integrally formed with the protective cover portion; In a cross section of the second protective cover unit parallel to its own axis, the circumferential wall of the transition ring is in an inwardly concave arc shape.

4. The air spring according to claim 1, characterized in that: The airbag assembly comprises a first airbag unit, a second airbag unit and a protrusion unit; the first airbag unit and the second airbag unit are both cylindrical; the first airbag unit is located inside the second airbag unit; the end of the first airbag unit away from the second connecting seat is integrally formed with the end of the second airbag unit away from the second connecting seat; the end of the first airbag unit facing the second connecting seat is detachably connected to the first connecting seat; the end of the second airbag unit facing the second connecting seat is detachably connected to the second connecting seat; the protrusion unit is annular; the protrusion unit is integrally formed with the second airbag unit; the protrusion unit protrudes from the outer circumferential wall of the second airbag unit; The air spring further includes a piston; the piston is cylindrical; a portion of the first connecting seat is disposed inside the piston; the piston is detachably connected to the first connecting seat; the piston is coaxial with the first airbag unit, and the piston is fitted between the first airbag unit and the first connecting seat; The casing assembly comprises a casing unit and a recessed unit; the casing unit is cylindrical; the recessed unit is annular; the recessed unit is integrally formed with the casing unit; the recessed unit is recessed on the inner circumferential wall of the casing unit; and the protruding unit is located in the recessed unit.

5. An air spring according to claim 4, characterized in that: The distance from one end of the protective tube unit away from the second connecting seat to the second connecting seat is a first distance; the distance from one end of the first airbag unit away from the second connecting seat to the second connecting seat is a second distance; the first distance is greater than the second distance.

6. An air spring according to claim 4, characterized in that: The casing assembly further comprises a connecting ring; the connecting ring is located at one end of the casing unit facing the second connecting seat; the connecting ring is located at the outside of the casing unit; the connecting ring is integrally formed with the casing unit.

7. An air spring according to claim 6, characterized in that: The airbag assembly also includes a third airbag unit; the third airbag unit is annular and coaxial with the second airbag unit; the end of the second airbag unit close to the second connecting seat is integrally formed with the third airbag unit; in the cross-section of the third airbag unit parallel to its own axis, the circumferential wall of the third airbag unit is arc-shaped; the maximum inner diameter of the third airbag unit is larger than the inner diameter of the second airbag unit; the connecting ring is located at the connecting portion between the second airbag unit and the third airbag unit.

8. A vehicle, characterized in that: The vehicle comprises: The air spring according to any one of claims 1 to 7; A vehicle body, wherein the first connecting seat in the air spring is detachably connected to the vehicle body; Suspension, the second connecting seat in the air spring is detachably connected to the suspension.

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