End cap structure for air spring

Abstract

The utility model provides an end cover structure for air spring, including lining ring, lower end cover base body and fitting piece, lining ring and lower end cover base body are integrative setting, and make lower end cover base body along the circumferential setting on the outer peripheral wall of lining ring, the bottom surface of lining ring is provided with the mounting groove who opens to the up, fitting piece installs in the mounting groove, and the outer periphery of fitting piece is tightly matched with the inner peripheral wall of mounting groove, is provided with anti -drop unit in the mounting groove, and through anti -drop unit limit fitting piece and come out from mounting groove, the utility model discloses the advantage this structure eliminates the assembly interface between lining ring and lower end cover base body through integrative design, has improved overall structural strength and sealing reliability, fitting piece realizes quick installation and reliable fixing through tightly matched cooperation and anti -drop unit, need not bolt or welding, reduces assembly difficulty and cost, and anti -drop unit can effectively prevent fitting piece from separating under the vibration or impact load, promotes overall connection stability.

Description

Technical Field

[0001] This utility model relates to the field of air spring technology, and more specifically, to an end cap structure for an air spring. Background Technology

[0002] The air spring assembly is a core component of the vehicle suspension system, playing a crucial role in buffering road impacts and suppressing vehicle vibrations. The reliability of the connection between the air spring bushing and the lower end cover base, as well as between the bushing and the mating parts, is of paramount importance. It directly determines the overall performance and service life of the air spring assembly and is one of the core links to ensure the stable operation of the air spring under complex working conditions such as vehicle driving.

[0003] The existing connection scheme has significant defects: First, the lower end cover and the mating parts are simply clamped together and fixed by assembly friction alone. Under the high-frequency vibration and alternating load of long-term vehicle driving, the mating parts are prone to loosening, displacement or even falling off. This not only leads to the degradation of the vibration damping performance of the assembly, but may also cause abnormal noise from component collisions. In severe cases, it can damage the structural integrity of the assembly and affect driving safety.

[0004] Secondly, the connection between the bushing and the lower end cap base mainly adopts a "bushel + snap-fit" split connection, which is extremely sensitive to tolerances and materials. The connection quality relies excessively on the strength of the lower end cap base itself and the accuracy of the end cap through-hole. Strict tolerance control can easily lead to failure due to excessively loose fit or damage due to excessively tight fit, increasing manufacturing costs and quality control difficulty. Furthermore, the sharp edges of the snap-fit ​​are prone to stress concentration, and stress peaks can easily form at the root of the snap-fit ​​or the edge of the fit. Under long-term dynamic loads, these can become sources of fatigue crack initiation, potentially causing early structural failure and restricting product durability and safety margin.

[0005] Therefore, there is an urgent need for a new type of end cap structure that can reduce the dependence on manufacturing precision, optimize stress distribution, and improve connection reliability and durability. Utility Model Content

[0006] This invention addresses the technical problems of existing connection structures between bushings and lower end caps, such as high tolerance requirements, stress concentration, and insufficient connection strength of mating parts. To overcome these shortcomings, this invention provides an end cap structure for air springs that achieves comprehensive optimization of tolerance compatibility, connection reliability, and fatigue durability through integrated design and multi-dimensional anti-detachment constraints.

[0007] To achieve the purpose of this utility model, the following technical solution is adopted: An end cap structure for an air spring includes a bushing, a lower end cap base, and a mating component. The bushing and the lower end cap base are integrally formed, with the lower end cap base circumferentially positioned on the outer peripheral wall of the bushing. The bottom surface of the bushing is recessed upwards to form a mounting groove. The mating component is installed within the mounting groove, with its outer periphery engaging tightly with the inner peripheral wall of the mounting groove. An anti-detachment unit is provided within the mounting groove to prevent the mating component from detaching from the groove. This structure eliminates the assembly interface between the bushing and the lower end cap base through its integral design, improving overall structural strength and sealing reliability. The mating component achieves rapid installation and reliable fixation through its engaging and anti-detachment unit, eliminating the need for bolts or welding, thus reducing assembly difficulty and cost. Furthermore, the anti-detachment unit effectively prevents the mating component from detaching under vibration or impact loads, enhancing overall connection stability.

[0008] Preferably, the anti-detachment unit includes a clearance opening formed on the inner peripheral wall of the mounting groove, and an elastic claw integrally formed with the bushing and disposed within the clearance opening. The elastic claw extends vertically and has elastic recovery capability, and the clearance opening provides the elastic claw with elastic deformation space perpendicular to the vertical direction. The upper end of the elastic claw is provided with an inclined guide surface from bottom to top and from outside to inside, and an assembly gap is formed between the upper end of the elastic claw and the bottom of the mounting groove for accommodating the mating part. Through its own elastic force, the elastic claw returns to its original position after the mating part is installed and is limited below the mating part, forming a self-locking constraint to limit the vertical displacement of the mating part. The automatic return of the elastic claw after assembly forms a mechanical self-locking, preventing the mating part from axially dislodging. The inclined guide surface guides the mating part to be smoothly installed, reducing assembly resistance and protecting the claw structure. The claw can elastically deform laterally to adapt to a certain range of dimensional tolerances and improve process compatibility.

[0009] Preferably, the mating component includes an integrally formed circular plate portion and a cylindrical portion coaxially arranged, with the diameter of the circular plate portion being larger than the diameter of the cylindrical portion. The outer peripheral wall of the circular plate portion is tightly fitted with the inner peripheral wall of the mounting groove, and after assembly, the circular plate portion is limited within the assembly gap by elastic claws. The integrated mating component structure enhances its rigidity and stability, and works in conjunction with the anti-detachment unit to ensure the structural consistency of the connection interface under dynamic loads, reducing wear caused by relative movement between components.

[0010] Preferably, the top surface of the circular plate is provided with an upwardly protruding positioning post; the bottom of the mounting groove is provided with a positioning hole corresponding to the positioning post, and the positioning post and the positioning hole form a circumferential positioning. The clearance fit between the positioning post and the hole prevents circumferential rotation of the mating parts during operation, facilitating clear assembly guidance and improving assembly efficiency and consistency.

[0011] Preferably, the lower part of the cylindrical section has several cylindrical positioning grooves evenly distributed circumferentially on its inner peripheral wall, and the lower end of each cylindrical positioning groove extends to the lower end face of the cylindrical section for positioning and engagement with external connectors. The engagement of the positioning grooves with external connectors provides stable torque transmission and positioning functions.

[0012] Preferably, the number of anti-detachment units is four, and they are evenly distributed along the inner circumferential wall of the mounting groove. This multi-point uniform constraint avoids localized stress concentration, improving connection rigidity and torsional resistance. Even if individual anti-detachment units fail, the rest can still provide effective constraint, enhancing system reliability.

[0013] Preferably, the mounting groove has several connecting ribs evenly distributed circumferentially on its inner peripheral wall. The connecting ribs are arranged vertically, and the inner wall of the connecting ribs forms an interference fit with the outer peripheral wall of the assembled mating part. The interference fit provides additional radial fastening force, preventing the mating part from shaking or loosening. Furthermore, the multi-rib structure evenly distributes contact stress, reducing the risk of localized wear.

[0014] Preferably, the inner wall at the lower end of each connecting rib is provided with a guide slope, which slopes from bottom to top and from the outside to the inside. The guide slope facilitates the insertion and installation of the mating parts.

[0015] Preferably, the number of connecting ribs is eight, with two connecting ribs evenly distributed between two adjacent anti-detachment units. This dense rib layout further optimizes stress distribution and improves connection stability; moreover, the multiple ribs working in conjunction with the anti-detachment units form a multi-layered safety mechanism, significantly enhancing vibration and impact resistance.

[0016] The advantages of this invention are as follows: By integrally molding the bushing and the lower end cap base, the separate assembly interface is fundamentally eliminated, avoiding the risks of fretting wear, stress concentration, and sealing failure that may be caused by bolted connections or press-fitting. This significantly improves structural integrity, sealing reliability, and axial load-bearing stiffness. By incorporating an anti-detachment unit with elastic claws, the mating parts can be smoothly pushed in along the inclined guide surface during assembly. After the claws elastically deform, they automatically return to their self-locking position, achieving fast and reliable assembly without the need for auxiliary tools or complex procedures. By combining four circumferentially distributed anti-detachment units with eight connecting ribs, a multi-restraint mechanism of axial anti-detachment, radial interference fit, and circumferential positioning is formed, effectively dispersing the load, reducing stress concentration, and significantly improving the fatigue resistance and dynamic stability of the connection system under vibration and impact conditions. Attached Figure Description

[0017] Figure 1 is a structural schematic diagram of the end cap structure for the air spring of this utility model. Figure 2 is a cross-sectional view of the end cap structure for the air spring of this utility model. Figure 3 is a structural schematic diagram of the bushing of this utility model. Figure 4 is a structural schematic diagram of the mating parts of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Liner ring; 11. Mounting groove; 12. Clearance opening; 13. Elastic claw; 131. Inclined guide surface; 14. Assembly clearance; 15. Positioning hole; 16. Connecting rib; 2. Lower end cover base; 3. Mating parts; 31. Circular plate part; 32. Circular cylinder part; 321. Circular positioning groove; 33. Positioning post. Detailed Implementation

[0019] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0020] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 4As shown, an end cap structure for an air spring includes a bushing 1, a lower end cap base 2, and a mating component 3. The bushing 1 and the lower end cap base 2 are integrally formed using precision casting, with the lower end cap base 2 circumferentially mounted on the outer peripheral wall of the bushing 1, ensuring structural continuity and no installation gaps. The bottom surface of the bushing 1 is recessed upwards to form a mounting groove 11, which is a cylindrical groove. The mating component 3 is installed within the mounting groove 11, with its outer peripheral wall tightly engaged with the inner peripheral wall of the mounting groove 11. An anti-detachment unit is provided within the mounting groove 11 to prevent the mating component 3 from detaching. The core innovation of this structure is the integral molding design of the bushing 1 and the lower end cap base 2, eliminating the traditional split assembly interface. This fundamentally avoids the risks of fretting wear, stress concentration, and sealing failure that may be caused by bolted connections or press-fitting, significantly improving the structural integrity, sealing reliability, and axial load-bearing stiffness of the component. The anti-detachment unit in the mounting slot 11 is used to lock and limit the mating part 3, effectively preventing the mating part 3 from detaching and improving the basic reliability of the connection between the bushing 1 and related components in the air spring assembly.

[0024] like Figures 1 to 3 As shown, there are four anti-detachment units, evenly distributed circumferentially along the inner circumferential wall of the mounting groove 11, with an included angle of 90° between adjacent anti-detachment units. These four anti-detachment units constitute a redundant mechanical interlocking system, dispersing the concentrated stress of the traditional single-point locking structure into multiple local contact stress peaks, significantly reducing the maximum equivalent stress, optimizing stress distribution, and enhancing the structure's fatigue resistance and long-term durability. Furthermore, the circumferentially distributed layout of the four anti-detachment units ensures balanced force distribution on the mating parts 3, preventing connection failure caused by localized overload, further strengthening the dynamic stability of the connection interface under complex working conditions, and reducing abnormal noise and fretting wear.

[0025] like Figure 3As shown, the anti-detachment unit includes a clearance opening 12 formed on the inner peripheral wall of the mounting groove 11, and an elastic claw 13 integrally formed with the bushing 1 and disposed within the clearance opening 12. The clearance opening 12 is a rectangular groove with an upward opening on the inner peripheral wall of the mounting groove 11, and the rectangular groove extends to the bottom of the mounting groove 11. The width of the clearance opening 12 is greater than the width of the elastic claw 13. The elastic claw 13 extends vertically (up and down) and has elastic recovery capability. The clearance opening 12 provides space for the elastic claw 13 to undergo radial (perpendicular to the up and down direction) elastic deformation. The upper end of the elastic claw 13 is provided with an inclined guide surface 131 that extends from bottom to top and from the outside to the inside, and the inclination angle of the inclined guide surface 131 is 30°. The upper end of the elastic claw 13 and the bottom of the mounting groove 11 form an assembly gap 14 to accommodate the circular plate portion 31 of the mating part 3. During assembly, the mating part 3 presses upward against the inclined guide surface 131 of the elastic claw 13, forcing the elastic claw 13 to undergo lateral elastic deformation and then be inserted into the assembly gap 14. After insertion, the elastic claw 13 returns to its original position due to its own elasticity, and the upper end of the elastic claw 13 is limited below the mating part 3 to form a self-locking constraint. By forming a self-locking constraint through the elastic return of the elastic claw 13 after assembly, both the ease of assembly and the prevention of plastic deformation or fracture at the root of the elastic claw 13 due to stress concentration during assembly are ensured. The self-locking constraint mechanism effectively suppresses the axial displacement tendency of the mating part 3 under vehicle vibration conditions, improving the reliability of the connection against detachment; the elastic deformation range of the elastic claw 13 can absorb manufacturing tolerance fluctuations, relax the requirements of critical dimension tolerance zones, and reduce the extreme dependence on the yield strength of the material.

[0026] like Figures 1 to 4 As shown, the mating component 3 includes an integrally formed circular plate portion 31 and a cylindrical portion 32 coaxially arranged, with the diameter of the circular plate portion 31 being larger than the diameter of the cylindrical portion 32. The outer peripheral wall of the circular plate portion 31 is tightly fitted with the inner peripheral wall of the mounting groove 11, and the thickness of the circular plate portion 31 is adapted to the depth of the assembly gap 14. After assembly, the circular plate portion 31 is limited within the assembly gap 14 by the elastic claw 13, achieving vertical limitation. By limiting the circular plate portion 31 within the gap after assembly by the elastic claw 13, axial limitation is precisely achieved, further enhancing the anti-disengagement effect and preventing axial movement of the mating component 3. Furthermore, the integrated structure of the mating component 3 improves its own rigidity and stability, working in synergy with the anti-disengagement unit to ensure the structural consistency of the connection interface under dynamic loads and reduce wear caused by relative movement between components.

[0027] like Figure 4As shown, the top surface of the circular plate portion 31 is provided with an upwardly protruding cylindrical positioning post 33; the bottom of the mounting groove 11 is provided with a circular positioning hole 15 corresponding to the positioning post 33, and the positioning post 33 and the positioning hole 15 are fitted together with a clearance fit to form circumferential positioning. The circumferential positioning is achieved by the clearance fit between the positioning post 33 and the positioning hole 15. The clearance fit design not only ensures the circumferential positioning accuracy, but also absorbs assembly tolerance fluctuations, improves tolerance compatibility, reduces assembly difficulty, and reduces stress concentration at the positioning part.

[0028] like Figure 1 As shown, six cylindrical positioning grooves 321 are evenly distributed circumferentially on the inner peripheral wall of the lower part of the cylindrical section 32, and the lower end of each cylindrical positioning groove 321 extends to the lower end face of the cylindrical section 32 for positioning and engagement with external connecting parts. The evenly distributed circumferential cylindrical positioning grooves 321 of the cylindrical section 32, with their lower ends extending through, facilitate precise positioning and engagement with external connecting parts, improve the assembly coordination between the entire end cover structure and external components, and ensure the installation accuracy of each component of the air spring assembly.

[0029] like Figures 1 to 3 As shown, several connecting ribs 16 are evenly distributed circumferentially on the inner wall of the mounting groove 11. The connecting ribs 16 are arranged vertically, and the inner wall of the connecting ribs 16 forms an interference fit with the outer wall of the assembled mating part 3. Through the interference fit between the connecting ribs 16 and the outer wall of the mating part 3, the connection tightness between the mating part 3 and the bushing 1 is further enhanced, the overall connection rigidity is improved, and the circumferential rotational torque is effectively resisted. In conjunction with the anti-detachment unit and the circumferential positioning structure, multiple mechanical interlocks are formed. At the same time, the interference fit design compensates for the slight looseness that may exist in the clearance fit, strengthens the connection stability under complex working conditions, and the connecting rib 16 structure does not significantly increase the overall weight or processing difficulty, taking into account both reliability and practicality. In this embodiment, there are eight connecting ribs 16, and two connecting ribs 16 are evenly distributed between two adjacent anti-detachment units. Through the reasonable number and distribution density of connecting ribs 16, the outer wall of the mating part 3 is subjected to uniform stress, avoiding component deformation or wear caused by excessive local interference pressure, optimizing stress distribution, and improving structural fatigue durability. Furthermore, while ensuring tightness and rigidity of the connection, the space occupied within the mounting groove 11 is minimized, without affecting the normal operation of the anti-detachment unit, thus achieving an optimized balance between function and structure. A guide slope is provided on the lower inner wall of each connecting rib 16, the guide slope sloping from bottom to top and from the outside to the inside. The guide slope facilitates the insertion and installation of mating parts.

[0030] During assembly, the circular plate portion 31 of the mating component 3 is aligned with the mounting groove 11, and the positioning pin 33 is aligned with the positioning hole 15. The mating component 3 is pushed upward, and the edge of the circular plate portion 31 contacts the inclined guide surface 131 of the elastic claw 13, applying a radially upward force, forcing the elastic claw 13 to elastically expand outward. When the circular plate portion 31 is fully inserted into the assembly gap 14, the elastic claw 13 automatically rebounds inward due to the elasticity of the material, and its upper hook portion is limited below the circular plate portion 31, forming an axial self-locking mechanism to prevent it from disengaging. At the same time, the clearance fit between the positioning pin 33 and the positioning hole 15 prevents the mating component 3 from rotating circumferentially.

[0031] In summary, the advantages of this utility model are: Integrated design enhances structural reliability: The bushing 1 and the lower end cover base 2 are integrally formed, eliminating the traditional split assembly interface. This avoids the risks of fretting wear, stress concentration and sealing failure that may be caused by bolt connection or press fit, and significantly improves the structural integrity, sealing reliability and axial load stiffness of the component.

[0032] The redundant anti-detachment system optimizes stress distribution: Four circumferentially distributed anti-detachment units constitute a redundant mechanical interlocking system, which disperses the concentrated stress of the traditional single-point locking structure into multiple local contact stress peaks, significantly reducing the maximum equivalent stress, enhancing the structure's fatigue resistance and long-term durability, while ensuring that the mating parts 3 are subjected to balanced forces, reducing abnormal noise and fretting wear under complex working conditions.

[0033] The elastic jaw 13 is designed to balance assembly and anti-disengagement: the clearance 12 provides deformation space for the elastic jaw 13, and the inclined guide surface 131 guides the mating parts 3 to assemble smoothly, avoiding plastic deformation or fracture caused by stress concentration at the root of the jaw during assembly; after assembly, the elastic jaw 13 automatically returns to its original position to form a self-locking constraint, effectively suppressing the axial displacement of the mating parts 3, and the elastic deformation domain can absorb manufacturing tolerance fluctuations, widening the tolerance zone of critical dimensions by about 40%, and reducing material and processing requirements.

[0034] Composite constraint enhances dynamic stability: the circular plate 31 is adapted to the assembly gap 14 to achieve axial positioning, the positioning post 33 and the positioning hole 15 cooperate to achieve circumferential positioning, and the connecting rib 16 is interference fit to enhance the tightness of the connection. The three form a composite constraint mechanism to fully resist axial displacement and circumferential rotation, and ensure the dynamic stability of the connection interface under complex working conditions such as vibration and impact.

[0035] External compatibility improves assembly accuracy: The cylindrical positioning groove 321 facilitates precise positioning and matching with external connectors, improving the assembly coordination between the entire end cover structure and other components of the air spring assembly, and ensuring the overall working performance of the air spring.

[0036] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0037] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An end cap structure for an air spring, characterized in that, It includes a liner ring (1), a lower end cap base (2), and a fitting part (3); the liner ring (1) and the lower end cap base (2) are integrally formed and the lower end cap base (2) is circumferentially disposed on the outer peripheral wall of the liner ring (1); the bottom surface of the liner ring (1) is recessed upward to form a mounting groove (11); the fitting part (3) is installed in the mounting groove (11), and the outer periphery of the fitting part (3) is tightly fitted with the inner peripheral wall of the mounting groove (11); an anti-detachment unit is provided in the mounting groove (11), and the fitting part (3) is restricted from detaching from the mounting groove (11) by the anti-detachment unit.

2. The end cap structure for an air spring according to claim 1, characterized in that, The anti-detachment unit includes a clearance opening (12) formed on the inner peripheral wall of the mounting groove (11) and an elastic claw (13) integrally formed with the bushing (1) and disposed in the clearance opening (12). The elastic claw (13) extends in the vertical direction and has elastic recovery capability. The clearance opening (12) provides the elastic claw (13) with an elastic deformation space perpendicular to the vertical direction. The upper end of the elastic claw (13) is provided with an inclined guide surface (131) from bottom to top and from outside to inside. An assembly gap (14) is formed between the upper end of the elastic claw (13) and the bottom of the mounting groove (11) for the mating part (3) to be accommodated. Through the elastic force of the elastic claw (13) itself, after the mating part (3) is installed, it returns to its original position and is limited below the mating part (3), forming a self-locking constraint to limit the vertical displacement of the mating part (3).

3. The end cap structure for an air spring according to claim 2, characterized in that, The mating part (3) includes an integrally formed circular plate part (31) and a cylindrical part (32) coaxially arranged, and the diameter of the circular plate part (31) is larger than the diameter of the cylindrical part (32). The outer peripheral wall of the circular plate part (31) is clamped to the inner peripheral wall of the mounting groove (11), and after assembly, the circular plate part (31) is limited in the assembly gap (14) by the elastic claw (13).

4. The end cap structure for an air spring according to claim 3, characterized in that, The top surface of the circular plate (31) is provided with an upwardly protruding positioning post (33); the bottom of the mounting groove (11) is provided with a positioning hole (15) corresponding to the positioning post (33), and the positioning post (33) and the positioning hole (15) form a circumferential positioning.

5. The end cap structure for an air spring according to claim 4, characterized in that, The inner circumferential wall of the lower part of the cylindrical part (32) is evenly distributed with a number of cylindrical positioning grooves (321) along the circumferential direction, and the lower end of each cylindrical positioning groove (321) extends to the lower end face of the cylindrical part (32) for positioning and cooperating with the external connecting parts.

6. The end cap structure for an air spring according to claim 1, characterized in that, The number of anti-detachment units is four, and they are evenly distributed along the inner circumferential wall of the mounting groove (11).

7. The end cap structure for an air spring according to claim 6, characterized in that, The mounting groove (11) has several connecting ribs (16) evenly distributed along the circumferential direction on its inner peripheral wall. The connecting ribs (16) are arranged in the vertical direction, and the inner wall of the connecting ribs (16) forms an interference fit with the outer peripheral wall of the assembled mating part (3).

8. The end cap structure for an air spring according to claim 7, characterized in that, Each of the connecting ribs (16) has a guide slope on the inner wall at the lower end, and the guide slope is inclined from the bottom up from the outside to the inside.

9. The end cap structure for an air spring according to claim 7, characterized in that, The number of connecting ribs (16) is eight, and two connecting ribs (16) are evenly distributed between two adjacent anti-detachment units.

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