CN120819597A

CN120819597A - An air spring

Info

Publication number: CN120819597A
Application number: CN202511336304.XA
Authority: CN
Inventors: 周爱明; 闻超; 胡祖江; 苏金; 吕俊德; 张玉侠
Original assignee: Wanxiang Qianchao Co Ltd
Current assignee: Wanxiang Qianchao Co Ltd
Priority date: 2025-09-18
Filing date: 2025-09-18
Publication date: 2025-10-21
Anticipated expiration: 2045-09-18
Also published as: CN120819597B

Abstract

The present invention relates to the technical field of automobile suspension systems, and more specifically, to an air spring. An air spring includes a piston assembly, a support assembly, an airbag assembly, a guide assembly, and a dustproof assembly. The airbag assembly includes an inner bladder, an outer bladder, and a support ring; the guide assembly includes a casing unit and a clamping unit; the casing unit includes a casing body; the outer circumferential surface of the casing body has a first protrusion and a second protrusion; the inner circumferential surface of the casing body has a first recess and a second recess; the inner circumferential surface of the casing body has a support ring groove; the clamping unit includes a clamping ring; the clamping ring has an air passage; the clamping ring is clamped between the first protrusion and the second protrusion; and the dustproof assembly includes a first dustproof unit and a second dustproof unit. This solves the problem of low positioning accuracy and easy damage to the casing when the dust cover is connected to the outer circumference of the casing.

Description

Air spring

Technical Field

The invention relates to the technical field of automobile suspension systems, in particular to an air spring.

Background

The automobile suspension system is a general name for all force transmission devices connected between a vehicle body and wheels and consists of elastic elements, shock absorbers, guide mechanisms, transverse stabilizing rods and other structures. An air spring is a kind of elastic element, which is a kind of spring that fills a flexible closed container with pressurized air and realizes elastic action by utilizing the compressibility of the air. The air spring is widely applied to self-adjusting air suspension of commercial automobiles, buses, railway vehicles and the like, can be used as a vibration isolation element of machine equipment such as a press machine, a shearing machine and the like, and can also be used as an elastic support of precision instruments such as an electron microscope, a laser instrument and the like, and a vibration isolation and vibration reduction device of a building base. In automotive suspension systems, air springs typically include rubber bladders, casings, inflation valves, closed air chambers, connectors, dust caps, and the like.

In order to locate and connect the dust cover on the outer circumferential side of the protective barrel, a locating groove is usually required to be formed on the outer circumferential side of the protective barrel, and the dust cover is clamped in the locating groove by using a clamping ring, so that the relative fixation of one end of the dust cover and the protective barrel is realized. The slotting process comprises the step of clamping the protective cylinder, but the clamping can damage the protective cylinder with a thinner thickness, and the slotting precision is difficult to control. How to accurately position the dust cover on the outer peripheral side of the protective cylinder without damaging the protective cylinder is a problem to be solved.

Disclosure of Invention

In order to solve the problems that the positioning precision of the dust cover connected to the outer peripheral side of the protective cylinder is low and the protective cylinder is easy to damage, the invention provides an air spring, which comprises the following components:

A piston assembly;

the support component is provided with a space between the support component and the piston component;

The air bag assembly comprises an inner bag body, an outer bag body and a supporting ring, wherein the inner bag body is positioned in the outer bag body, one end of the inner bag body is fixedly connected with the piston assembly, and the other end of the inner bag body extends along the direction away from the supporting assembly and is integrally formed with the outer bag body;

The guide assembly comprises a pile casing unit and a clamping unit, wherein the pile casing unit comprises a pile casing body, a first protruding part and a second protruding part which are formed by stamping are arranged on the outer peripheral surface of the pile casing body, a gap is reserved between the first protruding part and the second protruding part in the axial direction of the pile casing body, a plurality of first protruding parts and a plurality of second protruding parts are distributed at intervals along the circumferential direction of the pile casing body, a first concave part is arranged on the position of the first protruding part corresponding to the inner peripheral surface of the pile casing body, a second concave part is arranged on the position of the second protruding part corresponding to the inner peripheral surface of the pile casing body, a supporting annular groove is arranged on the inner peripheral surface of the pile casing body, a part of outer bag body is pressed into the supporting annular groove by the supporting ring, the clamping unit comprises a clamping ring, the clamping ring is sleeved on the outer peripheral surface of the pile casing body, a ventilation channel is arranged on the clamping ring, and the clamping ring is clamped between the first protruding part and the second protruding part;

The dustproof assembly comprises a first dustproof unit and a second dustproof unit, wherein the first dustproof unit and the second dustproof unit are cylindrical, the first dustproof unit and the second dustproof unit can axially stretch, the first dustproof unit is respectively connected with the piston assembly and the clamping ring, the second dustproof unit is respectively connected with the supporting assembly and the protective cylinder body, and an inner cavity of the first dustproof unit is communicated with the outside through the ventilation channel.

In some embodiments, the ventilation channel extends along the circumferential direction of the clamping ring to form a ring shape, a plurality of inner air ports distributed at intervals are formed on one side, facing the inside of the first dustproof unit, of the clamping ring, a plurality of outer air ports distributed at intervals are formed on one side, facing the outside of the first dustproof unit, of the clamping ring, and the inner air ports and the outer air ports are respectively communicated with the ventilation channel.

In some embodiments, the projection of the inner gas port along the axial direction of the clamping ring and the projection of the outer gas port along the axial direction of the clamping ring are arranged in a staggered manner.

In some embodiments, the first protruding portion is located at a side of the clamping ring facing the inner portion of the first dust-proof unit, and the first protruding portion and the inner air port are arranged at intervals along the circumferential direction of the clamping ring.

In some embodiments, the second protruding portion is located on one side of the clamping ring facing the outside of the first dust-proof unit, and at least part of the second protruding portion and at least part of the outer air port are located at the same position in the circumferential direction of the clamping ring.

In some embodiments, the vent channel extends through to an inner circumferential surface of the snap ring.

In some embodiments, the outer circumferential surface of the clamping ring has an outer annular groove;

the first dustproof unit comprises a first dustproof cover and a first compression ring, the first compression ring is sleeved on the outer side of the first dustproof cover, one end of the first dustproof cover is fixedly connected with the piston assembly, and the other end of the first dustproof cover is compressed to the inner portion of the outer annular groove by the first compression ring.

In some embodiments, the clamping ring comprises a plurality of arc-shaped clamping rings, and the arc-shaped clamping rings are spliced in sequence along the circumferential direction of the casing body.

In some embodiments, the distance between the end of the casing body away from the support assembly and the clamping ring is 55% -70% of the axial length of the casing body;

The inner peripheral surface of the casing body is provided with a rolling area, the area between the end part of the casing body, which is far away from the supporting component, and the clamping ring is provided with a rolling area, and the joint part of the inner bag body and the outer bag body is dynamically changed in the rolling area under the state that the piston component and the supporting component relatively move.

In some embodiments, the support ring is located on a side of the snap ring facing the support assembly.

In order to solve the problems that the positioning precision of the dust cover connected to the outer peripheral side of the protective cylinder is low and the protective cylinder is easy to damage, the invention has the following advantages:

The first dustproof unit is connected to the piston assembly and the clamping ring respectively, the clamping ring is clamped between the first protruding part and the second protruding part which are arranged on the outer peripheral surface of the protective cylinder body, so that the first dustproof unit can be positioned and connected to the outer peripheral surface of the protective cylinder body, the distance between the first protruding part and the second protruding part and the position of the first protruding part and the position of the second protruding part on the outer peripheral surface of the protective cylinder body can be set in the stamping step, one end of the first dustproof unit, which is connected with the clamping ring, can be accurately positioned and connected to the outer peripheral surface of the protective cylinder body according to the size requirement in design, the problem that the positioning precision of the first dustproof unit is low in installation is solved, the first protruding part and the second protruding part are formed on the outer peripheral surface of the protective cylinder body in a stamping mode through the stamping technology, and serve as a device for positioning and connecting the first dustproof unit on the outer peripheral surface of the protective cylinder body, secondary machining of the protective cylinder body is not needed, damage to the thinner protective cylinder body in the secondary machining clamping step is avoided, and the strength of the protective cylinder body is ensured.

Drawings

FIG. 1 illustrates a schematic cross-sectional view of an air spring of an embodiment;

FIG. 2 shows an enlarged partial schematic view of the air spring of FIG. 1 at A;

fig. 3 shows a partial schematic view of the clamping unit of the air spring in fig. 1.

Reference numerals 10 piston assembly, 20 support assembly, 30 air bag assembly, 31 inner bag body, 32 outer bag body, 33 support ring, 40 guide assembly, 41 casing unit, 411 casing body, 412 first boss, 413 first recess, 414 second boss, 415 second recess, 42 clamping unit, 421 clamping ring, 422 ventilation channel, 423 outer annular groove, 424 inner air port, 425 outer air port, 50 dustproof assembly, 51 first dustproof unit, 511 first dustproof cover, 512 first compression ring, 52 second dustproof unit, 521 second dustproof cover, 522 second compression ring.

Detailed Description

The disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those of ordinary skill in the art to better understand and thus practice the present disclosure, and are not meant to imply any limitation on the scope of the present disclosure.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. 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". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "transverse", "longitudinal", etc. refer to an orientation or positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, they may be fixedly connected, detachably connected, or of unitary construction, they may be mechanically or electrically connected, they may be directly connected, or they may be indirectly connected through intermediaries, or they may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The air spring is an elastic element applied to an automobile suspension system and comprises a rubber air bag, a protective cylinder, an inflation air valve, a closed air chamber, a connecting piece, a dust cover and other structures. In order to position and connect the dust cover on the outer peripheral side of the protective barrel, a positioning groove is usually required to be formed on the outer peripheral side of the protective barrel, and the slotting process comprises the step of clamping the protective barrel, but the clamping can damage the protective barrel with a thinner thickness, and slotting precision is difficult to control. How to accurately position the dust cover on the outer peripheral side of the protective cylinder without damaging the protective cylinder is a problem to be solved.

Embodiment one:

In this embodiment, as shown in fig. 1, the air spring includes a piston assembly 10, a support assembly 20, an air bag assembly 30, a guide assembly 40, and a dust prevention assembly 50.

The support assembly 20 is spaced from the piston assembly 10, and the support assembly 20 is connected to the shock absorber and the piston assembly 10 is connected to the vehicle frame in a state that the air spring is mounted on the vehicle. An airbag module 30 is connected between the support module 20 and the piston module 10. The guide assembly 40 is fitted around the outer peripheral side of the airbag assembly 30. As shown in fig. 1, when an external force is applied, the piston assembly 10 can move in a direction approaching or separating from the support assembly 20, that is, in a state of being mounted on a vehicle, the piston assembly 10 vertically reciprocates when the vehicle jolts, and cushioning is achieved by utilizing air pressure variation in the air bag assembly 30 and elastic deformation of the air bag assembly 30, and when the vehicle returns to a stable state, the piston assembly 10 and the support assembly 20 relatively displace less or relatively rest.

The airbag module 30 includes an inner bag 31, an outer bag 32, and a support ring 33, and the inner space of the airbag module 30 is sealed and filled with a certain amount of gas to provide a buffering effect when the piston assembly 10 is pressed to move toward the support assembly 20. The inner bag body 31 is positioned in the outer bag body 32, one end of the inner bag body 31 is fixedly connected with the piston assembly 10, the other end of the inner bag body 31 extends along the direction away from the support assembly 20 and is integrally formed with the outer bag body 32, the outer bag body 32 is fixedly connected with the support assembly 20, when the piston assembly 10 moves towards the support assembly 20 under the action of external force as shown in fig. 1, the piston assembly 10 drives the inner bag body 31 fixedly connected with the piston assembly 10 to move towards the support assembly 20, the end part of the outer bag body 32 away from the support assembly 20 is further driven to deform, the guide assembly 40 is a rigid piece, and at the moment, the inner space of the air bag assembly 30 is reduced, and the internal air pressure is increased. When the piston assembly 10 is unloaded by an external force, the inner bladder 31 is inflated to reduce the internal air pressure. The supporting ring 33 is clamped to the inner peripheral surface of the outer bag body 32, so that the outer bag body 32 can be supported when the air pressure rises, and the outer bag body 32 is prevented from being deformed or even damaged under pressure.

The guide assembly 40 comprises a casing unit 41 and a clamping unit 42, the casing unit 41 comprises a casing body 411, and the inner peripheral surface of the casing body 411 is abutted with the outer peripheral surface of a part of the outer bag body 32 to provide support and protection for deformation of the outer bag body 32 when the air pressure of the inner space of the air bag assembly 30 rises. As shown in fig. 2, the outer peripheral surface of the casing body 411 has a first boss 412 and a second boss 414 formed by punching. The first protruding portion 412 and the second protruding portion 414 have a space in the axial direction of the casing body 411, the first protruding portion 412 and the second protruding portion 414 are distributed at intervals along the circumferential direction of the casing body 411, the first protruding portion 412 is provided with a first concave portion 413 corresponding to the inner peripheral surface of the casing body 411, and the second protruding portion 414 is provided with a second concave portion 415 corresponding to the inner peripheral surface of the casing body 411. So that a plurality of first concave portions 413 and second concave portions 415 are distributed along the circumferential direction of the casing body 411 at intervals, and then when the air pressure in the inner space of the air bag assembly 30 is increased, the deformation amount of the first concave portions 413 and the second concave portions 415, which are arranged at intervals, of the outer bag body 32 to each interval is smaller and dispersed, so that the fatigue life of the outer bag body 32 is prolonged.

The inner peripheral surface of the casing body 411 is provided with a supporting ring 33 groove, a part of the outer bag body 32 is pressed into the supporting ring 33 groove by the supporting ring 33, so that the part of the outer bag body 32 can be fixedly connected to the inner peripheral surface of the casing body 411 through the supporting ring 33, the deformation degree of the air bag assembly 30 in the air pressure rising process is reduced, and the buffering performance of the air bag assembly 30 is further improved. As shown in fig. 2, the clamping unit 42 comprises a clamping ring 421, wherein the clamping ring 421 is sleeved on the outer circumferential surface of the protective cylinder body 411, and the clamping ring 421 is provided with a ventilation channel 422;

The dustproof assembly 50 comprises a first dustproof unit 51 and a second dustproof unit 52, wherein the first dustproof unit 51 and the second dustproof unit 52 are cylindrical, the first dustproof unit 51 and the second dustproof unit 52 can axially stretch, the first dustproof unit 51 is respectively connected with the piston assembly 10 and the clamping ring 421, the second dustproof unit 52 is respectively connected with the supporting assembly 20 and the protective cylinder body 411, and an inner cavity of the first dustproof unit 51 is communicated with the outside through a ventilation channel 422. This allows the first dust preventing unit 51 and the second dust preventing unit 52 to be moved in the same direction as the piston assembly 10 when the piston assembly 10 is moved toward or away from the support assembly 20.

Because the clamping ring 421 is clamped between the first protruding portion 412 and the second protruding portion 414, and the first dust-proof unit 51 is connected to the piston assembly 10 and the clamping ring 421 respectively, after one end of the first dust-proof unit 51 is connected to the piston assembly 10, the other end of the first dust-proof unit 51 can be clamped between the first protruding portion 412 and the second protruding portion 414 through the clamping ring 421, that is, the first dust-proof unit 51 is connected to the outer periphery side of the protective cylinder through a detachable clamping manner. Because the distance between the first boss 412 and the second boss 414 and the position on the outer circumferential side of the casing can be set during the punching process, the positioning accuracy of the first dust-proof unit 51 when positioned and connected to the outer circumferential side of the casing can be greatly improved, and the first dust-proof unit 51 can be easily replaced when the use standard is not satisfied after long-term use in a detachable connection manner. Since the first protruding portion 412, the second protruding portion 414, the first recessed portion 413 and the second recessed portion 415 are punched in the process of manufacturing the casing unit 41 by the punching process, instead of performing secondary processing on the casing unit 41 after the manufacturing is completed, damage to the casing unit 41 with a relatively thin thickness due to the existence of the clamping step in the secondary processing can be avoided. Thus, the problem that the dust cover is accurately positioned on the outer circumferential side of the protective cylinder and the protective cylinder is not damaged is solved.

In this embodiment, the first protrusion 412 and the first recess 413 are formed by simultaneous stamping, the second protrusion 414 and the second recess 415 are formed by simultaneous stamping, the position of the first protrusion 412 on the outer circumferential surface of the casing body 411 corresponds to the position of the first recess 413 on the inner circumferential surface of the casing body 411, and the position of the second protrusion 414 on the outer circumferential surface of the casing body 411 corresponds to the position of the second recess 415 on the inner circumferential surface of the casing body 411, so that the stamping process can be improved, and the strength of the casing unit 41 can be ensured after the first protrusion 412, the first recess 413, the second protrusion 414 and the second recess 415 are stamped.

In other embodiments, the first protrusions 412 and the second protrusions 414 are each distributed at intervals along the circumferential direction of the casing body 411, and the projections of the first protrusions 412 and the second protrusions 414 in the axial direction are circumferentially spaced. Since the first protrusion 412 and the second protrusion 414 play a role in positioning on the outer circumferential surface of the casing body 411, the sizes of the first protrusion 412 and the second protrusion 414 are small, so that the inner spaces of the first recess 413 and the second recess 415 are small, and the outer bag body 32 cannot excessively deform toward the inner spaces of the first recess 413 and the second recess 415 after being pressed, thereby prolonging the service life of the air bag assembly 30.

Further, as shown in fig. 3, the ventilation channel 422 extends in a ring shape along the circumferential direction of the snap ring 421. The side of the clamping ring 421 facing the inside of the first dustproof unit 51 is provided with a plurality of inner air ports 424 which are distributed at intervals, the side of the clamping ring 421 facing the outside of the first dustproof unit 51 is provided with a plurality of outer air ports 425 which are distributed at intervals, and the inner air ports 424 and the outer air ports 425 are respectively communicated with the ventilation channel 422. The piston assembly 10 drives the first dust-proof unit 51 to shrink or expand in the process of moving towards or away from the supporting assembly 20, so that the inner air port 424 and the outer air port 425 are respectively formed on two sides of the clamping ring 421, the interior of the first dust-proof unit 51 can be communicated with the atmosphere, and the inner air port 424 and the outer air port 425 are smaller in size, so that when the air circulates in the ventilation channel 422, dust and other foreign matters carried in the air can be blocked by the areas on two sides of the clamping ring 421, where the inner air port 424 and the outer air port 425 are not formed.

Further, referring to fig. 1 and 3, the projection of the inner air port 424 along the axial direction of the clamping ring 421 and the projection of the outer air port 425 along the axial direction of the clamping ring 421 are arranged in a staggered manner. Therefore, when the gas enters the first dustproof unit 51 from the outside, the gas needs to enter the ventilation channel 422 first and then enter the first dustproof unit 51 after flowing a certain distance in the ventilation channel 422, and the gas is similar to a labyrinth channel, so that the situation that the foreign matters in the gas can directly enter the first dustproof unit 51 when the inner gas port 424 and the outer gas port 425 are correspondingly arranged in the axial direction is avoided, and the blocking effect on the foreign matters is further ensured.

Further, referring to fig. 1 and 2, the first boss 412 is located at a side of the snap ring 421 facing the inside of the first dust prevention unit 51. The first protrusions 412 and the inner air ports 424 are spaced apart from each other in the circumferential direction of the snap ring 421, so that when the airbag module 30 is compressed down to exhaust the air outwardly through the inner air ports 424, the air is not easily blocked by the first protrusions 412, thereby smoothly blowing the foreign matters inside the first dust prevention unit 51 into the ventilation channel 422 and exhausting the foreign matters to the outside from the outer air ports 425.

Further, referring to fig. 1 and 2, the second boss 414 is located at a side of the snap ring 421 facing the outside of the first dust prevention unit 51. At least part of the second protrusions 414 and at least part of the outer air ports 425 are located at the same position in the circumferential direction of the clamping ring 421, so that when air enters the ventilation channel 422 from the outside, the second protrusions 414 located at the same position in the circumferential direction of the clamping ring 421 with the outer air ports 425 can block foreign matters, and the foreign matters are prevented from entering the ventilation channel 422 and further entering the inner space of the first dust prevention unit 51 as much as possible.

Further, as shown in fig. 3, the ventilation channel 422 penetrates to the inner circumferential surface of the clamping ring 421, so that the gas in the ventilation channel 422 flows smoothly, and the clamping ring 421 is easy to process.

Further, as shown in fig. 3, the outer circumferential surface of the snap ring 421 has an outer annular groove 423. The first dust-proof unit 51 comprises a first dust cover 511 and a first compression ring 512, the first compression ring 512 is sleeved on the outer side of the first dust cover 511, one end of the first dust cover 511 is fixedly connected with the piston assembly 10, and the other end of the first dust cover is compressed to the inner portion of the outer ring groove 423 through the first compression ring 512. This allows the first dust cap 511 to be pressed against the outer peripheral surface of the clip ring 421 by the first pressing ring 512. Because the clamping ring 421 is clamped between the first protruding portion 412 and the second protruding portion 414 on the outer peripheral side of the casing body 411, the first dust cover 511 can be accurately positioned on the outer peripheral side of the casing body 411 through the first clamping ring 512 and the clamping ring 421 and under the action of the first protruding portion 412 and the second protruding portion 414, and the casing body 411 is not damaged.

Further, referring to fig. 1 and 3, the snap ring 421 includes a plurality of arc-shaped snap rings, which are sequentially spliced along the circumferential direction of the casing body 411, so that the snap ring 421 is formed by splicing the plurality of arc-shaped snap rings, which is easier to manufacture and assemble at the outer circumferential side of the casing body 411.

Further, as shown in fig. 1, when the piston assembly 10 moves toward or away from the supporting unit, the outer bag 32 moves along with the piston assembly 10 in the same direction, and the joint portion between the inner bag 31 and the outer bag 32 also moves along with the outer bag 32. The distance between the end of the casing body 411 far from the support assembly 20 and the clamping ring 421 accounts for 55% -70% of the axial length of the casing body 411, and the area between the end of the casing body 411 far from the support assembly 20 and the clamping ring 421 on the inner peripheral surface of the casing body 411 is a rolling area, namely the rolling area accounts for 55% -70% of the axial length of the casing body 411. In a state where the piston assembly 10 and the support assembly 20 relatively move, the engagement portion between the inner bag 31 and the outer bag 32 dynamically changes in the rolling area. In this way, the rolling area occupies a larger proportion on the axial length of the inner peripheral surface of the casing body 411, so that the air spring has a good damping function, the material of the casing body 411 is saved, and the lightweight design of the casing unit 41 is realized.

And is arranged such that the engagement portion does not come out of the end of the casing body 411 remote from the support assembly 20 when moving upward, thereby preventing the outer capsule 32 from being damaged by plastic deformation. Under the condition that the vehicle slightly vibrates, the connecting part is not easy to reach the first concave part 413 and the second concave part 415 when moving downwards, so that the airbag assembly 30 is deformed, the situation that the connecting part is fatigued quickly in the reciprocating movement process is prevented, and the service life of the airbag assembly 30 is prolonged.

Further, as shown in fig. 1, since the area between the end of the casing body 411 away from the support component 20 and the clamping ring 421 is a rolling area, that is, the rolling area is located on the side of the clamping ring 421 away from the support component 20, and the support ring 33 is located on the side of the clamping ring 421 towards the support component 20, the requirement that the rolling area occupies a larger proportion of the axial length of the inner peripheral surface of the casing body 411 can be met, and a good supporting effect is provided for the air bag component 30, so that the air spring has a good damping function.

As shown in fig. 1, since the dust-proof assembly 50 is provided as the first dust-proof unit 51 and the second dust-proof unit 52, a split type arrangement is formed. And one end of the first dust-proof unit 51 is pressed by the first pressing ring 512 against the side of the support ring 33 facing away from the support assembly 20, and one end of the second dust-proof unit 52 is pressed by the second pressing ring 522 against the side of the support ring 33 facing toward the support assembly 20. And the support ring 33 can provide the support simultaneously for the protective casing body 411 that is located the support ring 33 both sides for the interval of the first dustproof unit 51 of split type setting and the dustproof unit 52 of second just described can set up great, and then saves the material of dustproof subassembly 50 when realizing dustproof function, realizes the lightweight design of dustproof subassembly 50. This reduces the volume of the entire air bag module 30 and the casing unit 41 as much as possible, and realizes a lightweight design of the air spring.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of implementing the disclosure, and that various changes in form and details may be made therein without departing from the scope of the disclosure.

Claims

1. An air spring, characterized in that the air spring comprises:

A piston assembly;

2. An air spring as set forth in claim 1 wherein,

The ventilation channel extends along the circumferential direction of the clamping ring to form a ring shape, a plurality of inner air ports which are distributed at intervals are formed in one side, facing the inside of the first dustproof unit, of the clamping ring, a plurality of outer air ports which are distributed at intervals are formed in one side, facing the outside of the first dustproof unit, of the clamping ring, and the inner air ports and the outer air ports are respectively communicated with the ventilation channel.

3. An air spring as set forth in claim 2 wherein,

The projection of the inner air port along the axial direction of the clamping ring and the projection of the outer air port along the axial direction of the clamping ring are arranged in a staggered mode.

4. An air spring as set forth in claim 3 wherein,

The first bulge part is positioned on one side of the clamping ring facing the inside of the first dustproof unit, and the first bulge part and the inner air port are arranged at intervals along the circumferential direction of the clamping ring.

5. An air spring as set forth in claim 4 wherein,

The second protruding part is positioned on one side of the clamping ring facing the outside of the first dustproof unit, and at least part of the second protruding part and at least part of the outer air port are positioned at the same position in the circumferential direction of the clamping ring.

6. An air spring as set forth in claim 2 wherein,

The ventilation channel penetrates to the inner circumferential surface of the clamping ring.

7. An air spring as set forth in claim 6 wherein,

The outer peripheral surface of the clamping ring is provided with an outer annular groove;

8. An air spring as set forth in claim 7 wherein,

The clamping ring comprises a plurality of arc-shaped clamping rings, and the arc-shaped clamping rings are spliced in sequence along the circumferential direction of the casing body.

9. An air spring as set forth in claim 1 wherein,

The distance between the end part of the casing body, which is far away from the supporting component, and the clamping ring is 55% -70% of the axial length of the casing body;

10. An air spring as set forth in claim 9 wherein,

The support ring is located at one side of the clamping ring, which faces the support assembly.