A rear air spring

Abstract

The present invention relates to the field of vehicle shock absorption technology, and in particular, to a rear air spring, comprising an upper seat assembly, a lower seat, a casing and a bladder skin, wherein the lower seat is provided with a support plane in the direction of the upper seat assembly, and an annular bladder skin fixing portion is also provided on the support plane; the upper end of the bladder skin is provided with a first fixed end, the first fixed end is sealed and connected to the upper seat assembly, and the lower end of the bladder skin is provided with a second fixed end, the second fixed end is sleeved on the outside of the bladder skin fixing portion; the casing comprises a main body, a support portion and a buckling portion; a transition section is provided on the upper side of the second fixed end of the bladder skin, the support portion can fit on the lower side of the transition section and support the transition section; the buckling portion is connected to the support plane, the buckling portion is sleeved on the outside of the second fixed end, and can squeeze the second fixed end to fit on the bladder skin fixing portion. In this way, the problems of the existing rear air spring having a complex structure, difficult installation, and the lack of support at the lower part of the bladder skin leading to easy damage are solved.

Description

Technical Field

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

[0002] The air spring is a sealed container filled with compressed air, which uses the compressibility of gas to achieve its elastic effect. The air spring has ideal nonlinear elastic characteristics. After the height adjustment device is installed, the height of the vehicle body does not change with the increase or decrease of the load. The spring stiffness can be designed to be lower, and the ride comfort is good.

[0003] Existing rear air springs usually have a complex structure, in which a protective tube is fixed on the outer side of the bladder skin and is fixed by a snap ring arranged in the bladder skin that cooperates with a corresponding groove on the protective tube. The upper and lower ends of the protective tube are both suspended in the air, and additional components such as dust covers are required to protect the bladder skin. The lower end of the bladder skin and the lower seat are also fixed by a snap ring. When fixing, special equipment is required to squeeze the snap ring to achieve the purpose of sealing and fixing the bladder skin. The installation is relatively cumbersome. In addition, the lower end of the bladder skin in the existing solution lacks support and fixation, which makes the bladder skin here more easily damaged when used for a long time. Summary of the invention

[0004] In order to solve the problems of the existing rear air spring having a complex structure, being difficult to install, and being easy to be damaged due to lack of support at the bottom of the bladder skin, the present invention provides a rear air spring, comprising: an upper seat assembly, a lower seat, a casing and a bladder skin, wherein the upper seat assembly is used to be connected to the vehicle body; the lower seat is provided with a supporting plane in the direction of the upper seat assembly, and an annular bladder skin fixing portion is also provided on the supporting plane; an inflation cavity is provided in the bladder skin, and the inflation cavity is filled with pressurized gas; a first fixing end is provided at the upper end of the bladder skin, and the first fixing end is sealed and connected to the upper seat assembly; a second fixing end is provided at the lower end of the bladder skin The second fixed end is sleeved on the outside of the bladder skin fixed part; the protective tube includes a main body part, a supporting part and a buckling part which are connected in sequence from top to bottom, the main body part is a cylindrical structure, and the bladder skin can expand under the action of pressurized gas so that the middle section of the bladder skin fits the inner circumference of the main body part; a transition section is arranged on the upper side of the second fixed end of the bladder skin, and the supporting part can fit the lower side of the transition section and support the transition section; the buckling part is connected to the supporting plane, and the buckling part is sleeved on the outside of the second fixed end, and can squeeze the second fixed end to fit the bladder skin fixed part to fix and seal the second fixed end.

[0005] In some embodiments, the upper part of the bag skin includes a bending section, the bag skin is bent inward through the bending section, and the top of the main body is higher than the bending section; the middle section of the bag skin includes a first sub-section, the main body includes an inclined hole section arranged at the upper part, the inner side wall of the inclined hole section is provided with an inclined groove extending downwardly, and the first sub-section is arranged corresponding to the inclined hole section.

[0006] In some embodiments, the inclined groove is arranged around the inner wall of the inclined hole section, and the angle between the inclined groove and the horizontal direction is 30°-80°.

[0007] In some embodiments, the inclined groove penetrates through the side wall of the body portion.

[0008] In some embodiments, the middle section of the bag skin also includes a second sub-section, the main body includes a vertical groove section connected to the support portion, the inner wall of the vertical groove section is provided with a strip groove extending in the vertical direction, and the second sub-section is arranged corresponding to the vertical groove section.

[0009] In some embodiments, a plurality of strip-shaped grooves are provided and are evenly spaced along the inner circumference of the vertical groove segment.

[0010] In some embodiments, one end of the strip-shaped groove extends to the connection between the second sub-segment and the support portion, and penetrates the side wall of the casing in a vertical direction.

[0011] In some embodiments, the rear air spring also includes a dust cover, a fixing ring and a fixing belt, the upper end of the dust cover is connected to the upper seat assembly; the fixing ring is sleeved on the outside of the protective tube, a fixing groove is provided on the outer peripheral surface of the fixing ring, and a matching structure matching the fixing groove is provided at the lower end of the dust cover, the matching structure matches the fixing ring, and the fixing belt is sleeved on the outside of the matching structure and fixed to the fixing ring.

[0012] In some embodiments, a bonding section is provided between the inclined hole section and the vertical groove section, a third sub-section is provided between the first sub-section and the second sub-section, and the third sub-section is fixedly connected to the bonding section; a limiting groove is provided on the outer peripheral surface of the bonding section, and a fixing ring is provided in the limiting groove.

[0013] In some embodiments, the support section is arc-shaped, the inner side wall of the support section fits with the transition section, and the transition section is fixed to the inner side wall of the support section.

[0014] In order to solve the problems of the existing rear air spring having a complex structure, being difficult to install, and being easily damaged due to lack of support under the bladder skin, the present invention has the following advantages:

[0015] In the above scheme, the structure of the protective tube is changed. It is no longer only fixed to the bladder skin with the upper and lower ends suspended in the air. Instead, it extends downward to the supporting plane of the lower seat and uses the supporting plane to provide supporting force for it. Therefore, the structure of the protective tube is simplified, and there is no need to set a structure matching the buckling ring located on the inner side of the bladder skin. The main body of the protective tube can be a simple cylindrical structure, and since the buckling ring is eliminated, the installation process and steps are simplified. In addition, since the protective tube extends to the supporting plane of the lower seat, the lower part of the bladder skin is completely located on the inner side of the protective tube, thereby eliminating the dust cover and related structures for protecting the bladder skin that are required in the prior art; at the same time, a buckling portion is provided at the bottom of the protective tube, and the buckling portion can be directly used to fix the lower end of the bladder skin, and the supporting portion can support the transition section, providing effective support for the lower side of the bladder skin to prevent it from aging, rupture, etc. due to excessive flexion and extension during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic cross-sectional structure diagram of a rear air spring according to an embodiment is shown;

[0017] Figure 2 Shows Figure 1 A partial enlarged structural diagram of the middle A part;

[0018] Figure 3 A schematic cross-sectional structure diagram of a casing according to an embodiment is shown;

[0019] Figure 4 Shows Figure 3 A schematic diagram of the partial enlarged structure of the middle B part;

[0020] Figure 5 Shows Figure 3 Schematic diagram of the partial enlarged structure of part C in the middle.

[0021] Figure markings: 10-upper seat assembly; 20-lower seat; 21-support plane; 22-bladder skin fixing part; 30-casing; 31-main body; 311-inclined hole section; 3111-inclined groove; 312-vertical groove section; 3121-strip groove; 313-adhesive section; 3131-limiting groove; 32-support part; 33-buckle part; 40-bladder skin; 41-bending section; 42-first sub-section; 43-second sub-section; 44-third sub-section; 45-first fixed end; 46-second fixed end; 50-dust cover; 51-fixing ring. DETAILED DESCRIPTION

[0022] 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 thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0023] As used herein, the term "including" and its variants 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". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or it can be 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 and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0024] This embodiment discloses a rear air spring, such as Figures 1 to 5As shown, it may include: an upper seat assembly 10, a lower seat 20, a casing 30 and a bladder skin 40, wherein the upper seat assembly 10 is used to be connected to the vehicle body; the lower seat 20 is provided with a support plane 21 in the direction of the upper seat assembly 10, and a ring-shaped bladder skin fixing portion 22 is also provided on the support plane 21; an inflatable cavity is provided in the bladder skin 40, and the inflatable cavity is filled with pressurized gas; a first fixing end 45 is provided at the upper end of the bladder skin 40, and the first fixing end 45 is sealed and connected to the upper seat assembly 10; a second fixing end 46 is provided at the lower end of the bladder skin 40, and the second fixing end 46 is sleeved on the outer side of the bladder skin fixing portion 22; the casing 30 It includes a main body portion 31, a support portion 32 and a buckling portion 33 which are connected in sequence from top to bottom. The main body portion 31 is a cylindrical structure. The bladder skin 40 can expand under the action of pressurized gas so that the middle section of the bladder skin 40 fits against the inner circumferential surface of the main body portion 31; a transition section is provided on the upper side of the second fixed end 46 of the bladder skin 40, and the support portion 32 can fit against the lower side of the transition section and support the transition section; the buckling portion 33 is connected to the supporting plane 21, and the buckling portion 33 is sleeved on the outer side of the second fixed end 46, and can squeeze the second fixed end 46 to fit against the bladder skin fixing portion 22, so as to fix and seal the second fixed end 46.

[0025] It should be noted that the rear air spring in the above technical solution is particularly suitable for the air spring in the rear suspension of the separated air suspension (the air suspension with the air spring and the air damping control valve separated), and of course, it can also be applied to the air spring in other cases.

[0026] Among them, the upper top seat assembly 10 can adopt the same upper top seat assembly 10 as in the prior art. At present, in the prior art, the upper and lower ends of the casing 30 are not connected to the components that can provide support or fixation, and only rely on the buckle ring set in the inflation cavity, and use the outward expansion force provided by the buckle ring to fix the casing 30 to the middle part of the bladder skin 40 to play a role of fixation and support. In the present application, the structure of the casing 30 is changed. It is no longer only fixed to the bladder skin 40 with the upper and lower ends suspended in the air, but extends downward to the support plane 21 of the lower seat 20, and uses the support plane 21 to provide support for it. Therefore, the structure of the casing 30 is simplified, and it is no longer necessary to set a structure matching the buckle ring located on the inner side of the bladder skin 40. The main body 31 of the casing 30 can be a simple cylindrical structure, and since the buckle ring for fixing the casing 30 is cancelled, the installation process and steps are simplified.

[0027] In addition, in the current technical solution, there is a certain distance between the lower end of the casing 30 and the lower seat 20, so part of the bladder skin 40 is exposed in the gap between the casing 30 and the lower seat 20. In order to protect this part, a lower dust cover 50 is usually provided in the current technical solution. The upper end of the lower dust cover 50 is fixed on the casing 30, and the lower end is connected to the edge of the lower seat 20, so as to prevent the external material from damaging the exposed bladder skin 40. In the above scheme of the present invention, since the casing 30 extends to the support plane 21 of the lower seat 20, the lower part of the bladder skin 40 is completely located inside the casing 30, so the dust cover 50 and related structures for protecting the bladder skin 40 that need to be set in the prior art are also eliminated. Accordingly, since it is not necessary to fix the dust cover 50, the related structures for fixing the dust cover 50 in the casing 30 and the lower seat 20 are also omitted, thereby simplifying the structure.

[0028] At the same time, a buckling portion 33 is provided at the bottom of the casing 30, and the buckling portion 33 can be used to directly fix the lower end of the bladder skin 40. In the current traditional installation scheme, a buckling ring is mainly used as a fixing component. The fixed lower seat 20 is generally provided with a mounting portion for mounting the lower end of the bladder skin. Specifically, the mounting portion usually has a cylindrical outer peripheral surface for mounting and fixing the bladder skin 40. During the installation process, the bladder skin 40 is first placed on the mounting portion, and then a force is applied to the buckling ring through special equipment or tools. The buckling ring is plastically deformed and squeezes the bladder skin 40, thereby sealing and fixing the bladder skin 40 on the outer peripheral surface of the mounting portion. However, in the present application, force can be directly applied to the buckling portion 33 of the protective tube 30 to achieve a function similar to that of the buckling ring in the traditional solution, and the gap between the buckling portion 33 and the bladder skin fixing portion 22 of the lower seat 20 can also be set to be smaller than the thickness of the bladder skin 40, so that the bladder skin 40 after installation undergoes elastic deformation and is clamped between the buckling portion 33 and the bladder skin fixing portion 22, thereby achieving the purpose of sealing connection and fixation.

[0029] Furthermore, the support portion 32 provided in the casing 30 can support the transition section, provide effective support for the lower side of the bladder skin 40, and prevent aging, cracking, etc. caused by excessive flexion and extension during long-term use. The support portion 32 can have a variety of implementations, but at least a portion needs to be able to fit the bladder skin 40, and the portion should have an angle of less than 90 degrees with the horizontal direction to provide an upward support force.

[0030] Since the air spring can change the shock absorption and support parameters of the air spring by changing the gas pressure and volume in the inflatable cavity, the inflatable cavity needs to be able to expand or compress in the vertical direction as the internal gas pressure and volume increase or decrease. In order to achieve this effect, in some embodiments, such as Figure 1 as well as Figure 3As shown, the upper portion of the bladder skin 40 includes a bending section 41 , the bladder skin 40 is bent inwardly through the bending section 41 , and the top end of the main body 31 is higher than the bending section.

[0031] When the volume of the inflatable cavity expands, it can only expand in the vertical direction due to the limitation of the side by the casing 30. When expanding, the purpose of changing the volume of the inflatable cavity is achieved by setting the bending section 41. Under the action of the pressure gas, the middle and lower sections of the bladder skin 40 are in contact with the inner side of the casing 30, but the bladder skin 40 is not fixed on the casing 30. Therefore, in the actual working state, when the bladder skin 40 is bent, the bladder skin 40 will have relative friction with the casing 30, and the bladder skin 40 is mainly made of rubber material, which will age with the increase of use time. The above reasons will cause the bladder skin 40 to gradually produce some fine powder during use. At the same time, the air spring is installed on the vehicle. Although dust prevention measures are set, it is inevitable that some fine dust will enter the position between the bladder skin 40 and the casing 30. These powders and dust will enter between the bladder skin 40 and the casing 30, and aggravate the wear of the bladder skin 40, further shortening the life of the bladder skin 40.

[0032] In order to solve the above problems, the middle section of the bag skin in the present invention includes a first sub-section 42, the main body 31 includes an inclined hole section 311 arranged at the upper part, the inner side wall of the inclined hole section 311 is provided with an inclined groove 3111 extending downwardly, and the first sub-section 42 is arranged corresponding to the inclined hole section 311.

[0033] The inclined groove 3111 may be a hole provided in the inclined hole section 311, and its downwardly inclined extension allows dust and powder to enter therein, thereby avoiding further damage to the capsule skin 40. At the same time, since the casing 30 usually has a thinner wall thickness, the inclined groove 3111 extending obliquely downward may have a deeper depth while reducing the wall thickness of the casing 30. The cross-section of the inclined groove 3111 may adopt a variety of appropriate shapes, such as circular, square, etc., and its distribution mode may also adopt a variety of forms, which may adopt a uniform distribution mode or other distribution rules, such as a sparse distribution mode at the top and dense distribution mode at the bottom, because the powder or dust will gradually move between the capsule skin 40 and the casing 30 with the movement of the capsule skin 40, and this process is also affected by gravity. Therefore, these dust and powder mainly move downward, and therefore, a relatively dense inclined groove 3111 may be provided at the bottom. Furthermore, due to the provision of the inclined groove 3111 , the strength of the casing 30 in the inclined hole section 311 will be reduced. Therefore, the thickness of the casing 30 may be appropriately increased, or reinforcing structures such as reinforcing ribs may be added.

[0034] As another embodiment, Figure 3 as well as Figure 4As shown, the inclined groove 3111 is arranged around the inner wall of the inclined hole section 311, and the angle between the inclined groove 3111 and the horizontal direction is 30°-80°.

[0035] The inclined grooves 3111 arranged around the inner wall of the inclined hole section 311 can more fully intercept impurities such as rubber powder and dust. Furthermore, a plurality of inclined grooves 3111 can be arranged at intervals in the vertical direction in the inclined hole section 311 to achieve a better interception effect.

[0036] As another optional embodiment, the inclined groove 3111 penetrates the side wall of the main body 31. That is, a through hole is formed that penetrates the side wall of the casing 30 and is inclined downward, so that the substances entering the inclined groove 3111 can be discharged directly, and because the inclined groove 3111 is inclined downward, it is difficult for foreign substances to directly contact the bladder skin 40 through this and cause damage to it. It should be noted that for the inclined groove 3111 arranged around the inner wall of the inclined hole section 311, it is not suitable to adopt the solution of penetrating the side wall of the main body 31, which will cause the inclined hole section 311 to become a plurality of annular structures. At this time, the lack of a fixed structure will cause the casing 30 to fail.

[0037] At the lower part of the main body 31, the bladder skin 40 here will produce some twisting in the working state, which will cause the bladder skin 40 to rub against the inner circumference of the casing 30, and also produce some wear debris or powder, etc., which will also cause excessive wear of the bladder skin 40. In the prior art, the lower end of the casing 30 is not sealed. Therefore, even if some debris is generated, it can be discharged through the lower end of the casing 30 under the action of gravity and will not accumulate between the casing 30 and the bladder skin 40 for a long time. However, in the present invention, the structure of the casing 30 is changed so that the lower end of the casing 30 is closed. In order to solve this problem, Figure 1 as well as Figure 3 As shown, the middle section of the bag skin 40 also includes a second sub-section 43, the main body 31 includes a vertical groove section 312 connected to the support portion 32, the inner wall of the vertical groove section 312 is provided with a strip groove 3121 extending in the vertical direction, and the second sub-section 43 is arranged corresponding to the vertical groove section 312.

[0038] That is, the vertical groove section 312 is arranged at the lowest part of the entire main body 31, and these strip grooves 3121 can collect debris generated by friction between the bladder skin 40 and the casing 30 when the bladder skin 40 is twisted. Since the bladder skin 40 is not made of a material with great flexibility, it is often provided with structural components such as wire mesh for reinforcement in addition to rubber to increase strength. Even if these strip grooves 3121 are arranged to have a large width, the bladder skin 40 will not be completely filled in the grooves, and there will still be space for collecting debris. Moreover, since the thickness of the side wall of the casing 30 is small, even if the strip grooves 3121 are arranged, their depth is shallow, and the bladder skin 40 will not be overstretched.

[0039] Specifically, Figure 3 As shown, a plurality of strip-shaped grooves 3121 are provided and are evenly spaced along the inner circumference of the vertical groove section 312 .

[0040] Furthermore, one end of the strip groove 3121 may be extended to the connection between the second subsection 43 and the support portion 32, and vertically penetrate the side wall of the casing 30. Since the casing 30 of the support portion 32 will reduce its diameter inward relative to the body portion 31, the debris entering the strip groove 3121 may be concentrated at the intersection of the body portion 31 and the support portion 32 under the action of gravity, where a downward communicating hole will be generated on the side wall of the strip groove 3121 that penetrates the casing 30, through which the debris entering the strip groove 3121 can be discharged.

[0041] In some embodiments, Figure 1 As shown, the rear air spring also includes a dust cover 50, a fixing ring 51 and a fixing belt. The upper end of the dust cover 50 is connected to the upper seat assembly 10; the fixing ring 51 is sleeved on the outside of the casing 30, and a fixing groove is provided on the outer peripheral surface of the fixing ring 51. The lower end of the dust cover 50 is provided with a matching structure matching the fixing groove, and the matching structure matches the fixing ring 51. The fixing belt is sleeved on the outside of the matching structure and fixed to the fixing ring 51.

[0042] Since the top of the casing 30 is in an open state, a dust cover 50 is usually required to protect the inner bladder skin 40. In the prior art, since the fixing of the casing 30 requires a corresponding structure to cooperate with the buckling ring, the fixing ring 51 can be set by taking advantage of the buckling ring. However, the buckling ring has been cancelled in the above-mentioned solution of the present invention. Therefore, the fixing solution of the fixing ring 51 in the traditional solution is no longer applicable. In the present application, the lower end of the dust cover 50 is fixed to the fixing ring 51 by means of the fixing belt, and the fixing groove cooperates with the fixing ring 51, and the fixing ring 51 is set on the outer peripheral surface of the casing 30.

[0043] In order to prevent the dust or rubber powder generated from entering through the upper end of the casing 30 from continuing to penetrate into the second subsection 43, as shown in FIG. Figure 1 as well as Figure 3 , Figure 5 As shown, a bonding section 313 is further provided between the inclined hole section 311 and the vertical groove section 312, a third sub-section 44 is provided between the first sub-section 42 and the second sub-section 43, and the third sub-section 44 is fixedly connected to the bonding section 313; a limiting groove 3131 is provided on the outer peripheral surface of the bonding section 313, and the fixing ring 51 is arranged in the limiting groove 3131.

[0044] The third sub-segment 44 and the bladder skin 40 can be fixedly connected by bonding, and the two can be connected by adhesives such as glue, that is, the bladder skin 40 and the third sub-segment 44 are connected as a whole. At this time, even if there is dust or other substances, they cannot pass through here and penetrate into the second sub-segment 43. In addition, the fixing groove can be set corresponding to the third sub-segment 44. Since there is no groove or other structure in the third sub-segment 44, it has a strong structural strength. The fixing groove is set here to ensure the overall structural strength of the casing 30.

[0045] Since the transition section of the bladder skin 40 is arranged in the support part 32 of the casing 30, due to the support function of the support part 32 and the friction between the bladder skin 40 and the casing 30, during use, the bladder skin 40 may separate from the inner wall of the casing 30 and form a cavity similar to a hollow drum. In order to prevent the above situation from happening, the support section is arc-shaped, the inner side wall of the support section fits with the transition section, and the transition section is fixed to the inner side wall of the support section. The fixing method can adopt the same fixing method as the second sub-section 43 and the bladder skin 40.

[0046] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A rear air spring, characterized in that: The rear air spring comprises: An upper seat assembly, a lower seat, a casing and a bladder skin, wherein the upper seat assembly is used to connect with the vehicle body; The lower seat is provided with a support plane in the direction toward the upper seat assembly, and the support plane is also provided with an annular bladder skin fixing portion; An inflatable cavity is provided in the bladder skin, and the inflatable cavity is filled with pressurized gas. A first fixed end is provided at the upper end of the bladder skin, and the first fixed end is sealed and connected to the upper seat assembly. A second fixed end is provided at the lower end of the bladder skin, and the second fixed end is sleeved on the outer side of the bladder skin fixed portion. The protective tube comprises a main body, a supporting part and a pressing part which are connected in sequence from top to bottom, the main body is a cylindrical structure, and the bladder skin can expand under the action of the pressure gas so that the middle section of the bladder skin is attached to the inner circumference of the main body; A transition section is provided on the upper side of the second fixed end of the bag skin, and the support portion can be attached to the lower side of the transition section and support the transition section; The buckling portion is connected to the supporting plane, and the buckling portion is sleeved on the outside of the second fixed end, and can press the second fixed end to fit the bag skin fixing portion, so as to fix and seal the second fixed end; The upper part of the bladder skin comprises a bending section, the bladder skin is bent inwardly through the bending section, and the top end of the main body is higher than the bending section; The middle section of the bladder skin includes a first subsection, the main body includes an inclined hole section arranged at the upper part, the inner side wall of the inclined hole section is provided with an inclined groove extending obliquely downward, and the first subsection is arranged corresponding to the inclined hole section.

2. A rear air spring according to claim 1, characterized in that: The inclined groove is arranged around the inner wall of the inclined hole section, and the angle between the inclined groove and the horizontal direction is 30°-80°.

3. A rear air spring according to claim 1, characterized in that: The inclined groove penetrates through the side wall of the main body.

4. A rear air spring according to claim 1, characterized in that: The middle section of the bag skin also includes a second sub-section, the main body includes a vertical groove section connected to the support part, the inner wall of the vertical groove section is provided with a strip groove extending in the vertical direction, and the second sub-section is arranged corresponding to the vertical groove section.

5. A rear air spring according to claim 4, characterized in that: A plurality of strip-shaped grooves are provided and are evenly spaced along the inner circumference of the vertical groove section.

6. A rear air spring according to claim 4, characterized in that: One end of the strip-shaped groove extends to the connection between the second sub-segment and the support portion, and penetrates the side wall of the casing in a vertical direction.

7. A rear air spring according to claim 4, characterized in that: The rear air spring further comprises a dust cover, a fixing ring and a fixing belt, wherein the upper end of the dust cover is connected to the upper seat assembly; The fixing ring is sleeved on the outside of the casing, a fixing groove is provided on the outer peripheral surface of the fixing ring, a matching structure matching the fixing groove is provided at the lower end of the dust cover, the matching structure matches the fixing ring, and the fixing belt is sleeved on the outside of the matching structure and fixed to the fixing ring.

8. A rear air spring according to claim 7, characterized in that: A bonding section is further provided between the inclined hole section and the vertical slot section, a third subsection is provided between the first subsection and the second subsection, and the third subsection is fixedly connected to the bonding section; The outer circumferential surface of the bonding section is provided with a limiting groove, and the fixing ring is arranged in the limiting groove.

9. A rear air spring according to claim 8, characterized in that: The support portion is arc-shaped, the inner side wall of the support portion is in contact with the transition section, and the transition section is fixed to the inner side wall of the support portion.

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