Piston structure, air spring assembly, and vehicle

Abstract

The application relates to the technical field of suspensions, and particularly provides a piston structure, an air spring assembly and a vehicle. The piston structure provided by the application comprises a piston main body and a nut. The piston main body is provided with a gas passage, one end of the gas passage is used for being communicated with a gas pipe, and the other end of the gas passage is used for being communicated with a gas bag. The nut is used for being connected with the gas pipe, the nut is embedded at one end of the gas passage close to the gas pipe, and one end of the nut away from the gas pipe is covered by the piston main body. The structure strength of the piston structure and the pipeline at the joint is high, and the air tightness is high.

Description

Technical Field

[0001] This application relates to the field of suspension technology, and in particular to a piston structure, an air spring assembly using the piston structure, and a vehicle using the air spring assembly. Background Technology

[0002] As a core component of a vehicle's suspension system, the performance of air springs directly affects the comfort and safety of the entire vehicle. The piston is a crucial component of the air spring, and the threaded structure connecting it to the piping is essential for airtightness and assembly reliability.

[0003] In related technologies, the threaded structure connecting the air spring piston to the pipeline mainly adopts two molding methods: one is to integrally mold the plastic thread through injection molding, and the other is to use a tap to self-tap the thread after injection molding. Both methods rely on the mechanical properties of the plastic material itself, but the torsional strength of plastic threads is limited.

[0004] However, in the above-mentioned solutions, the plastic threads have low mechanical strength, making it difficult to meet the torque requirements of pipe connections. Under repeated assembly or vibration conditions, the threads are prone to stripping, leading to decreased airtightness or even air leakage. Utility Model Content

[0005] This application provides a piston structure, an air spring assembly, and a vehicle, which can improve the structural strength at the connection between the piston structure and the pipeline, avoid stripping to a certain extent, and improve air tightness.

[0006] In a first aspect, this application provides a piston structure, including a piston body and a nut; the piston body has a gas passage, one end of which is used to communicate with an air tube, and the other end of which is used to communicate with an air bladder; the nut is used to connect with the air tube, the nut is embedded in the end of the gas passage near the air tube, and a portion of the piston body covers the end of the nut away from the air tube.

[0007] The gas passage has a nut embedded at the end near the gas tube, which is threaded into the gas tube. The piston body's injection-molded material covers the end of the nut away from the gas tube, securing it firmly. This not only enhances the torsional strength of the threads, effectively preventing stripping, but also ensures airtightness, mitigating loosening and leakage caused by repeated disassembly or vibration. Simultaneously, the embedded metal nut makes the gas tube connection more stable, capable of withstanding higher tightening torque, thereby improving the overall durability and assembly efficiency of the air spring assembly with this piston structure.

[0008] As an optional implementation, the gas channel includes a first channel section and a second channel section that are perpendicular to each other and connected. The first channel section is used to connect with the air tube, and the second channel section is used to connect with the airbag. A nut is embedded in the first channel section.

[0009] In this way, the vertical steering structure design allows for a compact arrangement of the two functional interfaces: the air pipe connection and the airbag connection, saving installation space and providing greater flexibility for the layout of the air spring assembly in the vehicle chassis.

[0010] Furthermore, the design of directly embedding the nut within the first channel section not only shortens the airflow path and reduces pressure loss, but also creates a reliable mechanical connection and sealing barrier at the gas pipe interface through the integrated structure of the metal nut and the plastic gas channel. This, to a certain extent, avoids the leakage risks that may exist with traditional segmented connections.

[0011] As an alternative implementation, a transition wall is formed on the sidewall of the second channel segment, with the transition wall facing the first channel segment.

[0012] Thus, the design of the transition wall can improve the smoothness of gas flow and reduce noise.

[0013] As an alternative implementation, the transition wall includes an arcuate wall and an inclined wall connected together; the arcuate wall is located on the side of the inclined wall away from the airbag, and the arcuate wall is recessed in the direction away from the first channel segment; the inclined wall extends from the side near the first channel segment to the side away from the first channel segment in the direction from away from the airbag to near the airbag.

[0014] In this way, when the airflow enters the second channel section from the first channel section, the concave design of the arc-shaped wall can effectively guide the airflow to turn smoothly, avoid the generation of turbulence, thereby reducing airflow noise and improving gas delivery efficiency; while the inclined extension of the inclined wall further optimizes the airflow path, ensuring that compressed air can smoothly enter the airbag and reduce pressure loss.

[0015] In this way, not only is the aerodynamic performance improved, but its geometric features also enhance the local structural strength. The concave design of the arc-shaped wall can better disperse stress when subjected to airbag pressure, while the extension direction of the inclined wall is optimally matched with the airflow direction, which not only ensures smooth airflow but also improves the deformation resistance of the channel wall.

[0016] As an alternative implementation, the piston body includes a main body portion and a connecting portion connected together, a gas passage is formed in the main body portion, and the connecting portion is used to connect with the air bladder; wherein, a groove extending toward the air bladder is formed at the bottom of the main body portion.

[0017] This ensures the uniformity of the wall thickness of the main body, effectively avoiding defects such as shrinkage cavities and stress concentration caused by sudden changes in wall thickness during injection molding, and improving the molding quality and structural reliability of the product.

[0018] Furthermore, the extension direction of the groove is coordinated with the expansion direction of the air bladder, allowing it to better adapt to deformation during air bladder inflation, reducing local stress, and thus extending the service life of the piston structure. Simultaneously, this uniform wall thickness design results in a more rational material distribution, ensuring structural strength while avoiding unnecessary material waste, achieving a perfect balance between lightweight and structural strength. More importantly, the uniform wall thickness distribution makes the piston structure provided in this embodiment more uniformly stressed under alternating loads, preventing premature failure due to local weak points to a certain extent, and providing a reliable guarantee for the stable operation of the air spring assembly under long-term vibration conditions.

[0019] As an optional implementation, the piston structure provided in this embodiment also includes a reinforcing ring, which is disposed within the connecting portion.

[0020] In other words, the reinforcing ring, as an internal reinforcing skeleton of the connection, enhances the structural rigidity of the connection, enabling it to better resist deformation when subjected to the periodic high-pressure impact of the airbag, thereby avoiding fatigue cracking of the connection due to long-term stress to a certain extent.

[0021] Meanwhile, the addition of the reinforcing ring optimizes the stress distribution at the connection, effectively dispersing the stress peaks that were originally concentrated at the junction of the connection and the main body, greatly reducing the risk of stress concentration in this critical area. This built-in reinforcing structure also cleverly maintains the integrity of the outer surface of the connection, ensuring that the function of the anti-slip teeth is not affected, thus guaranteeing both the connection strength with the airbag and the ease of assembly.

[0022] As an optional implementation, the main body has multiple independent chambers, and each chamber has a groove formed on its bottom wall.

[0023] In this way, by dividing the main body into multiple independent chambers, each chamber has a groove with uniform wall thickness at the bottom. This honeycomb structure not only significantly improves the overall rigidity, but also optimizes the stress distribution, enabling the piston structure to evenly transfer the load to the entire structure when subjected to airbag pressure.

[0024] Furthermore, integrating the gas channels into the thickened partitions ensures both the structural strength of the gas channels and cleverly utilizes the thickness differences of the partitions to achieve functional zoning. The synergistic effect of multiple chambers effectively suppresses local deformation, while the uniform groove design ensures consistent material flow in each chamber during injection molding, thus avoiding common problems such as shrinkage marks and warpage to a certain extent.

[0025] As an optional implementation, the nut is a copper nut.

[0026] Copper has excellent corrosion resistance, effectively resisting oxidation and electrochemical corrosion in harsh environments such as humidity and salt spray, thereby extending the service life of the piston structure provided in this embodiment.

[0027] Meanwhile, the ductility and self-lubricating properties of copper make the threaded connection less prone to wear during repeated disassembly and assembly, further reducing the risk of stripping. The slight plastic deformation of copper can also fill the mating gap, further enhancing airtightness and ensuring the pressure stability of the air spring assembly.

[0028] Secondly, this application provides an air spring assembly, including an air tube, an air bladder, and the aforementioned piston structure; wherein the air tube is connected to one end of a gas passage, and the air bladder is connected to the other end of the gas passage.

[0029] The air spring assembly provided in this application has strong stability and reliability in use by adopting the above-mentioned piston structure.

[0030] As an optional implementation, the air spring assembly provided in this application also includes an air connector, which is connected between the nut and the air pipe.

[0031] This allows for the connection between the piston structure and the air tube.

[0032] Thirdly, this application provides a vehicle including a body and the aforementioned air spring assembly; the air spring assembly is mounted on the body.

[0033] The vehicle provided in this application, by adopting the aforementioned air spring assembly, can improve the vehicle's comfort and stability. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the piston structure provided in the embodiments of this application;

[0035] Figure 2 An exploded view of the piston structure provided in an embodiment of this application;

[0036] Figure 3 for Figure 1 A cross-sectional view along the AA direction;

[0037] Figure 4 A schematic diagram of a partial structure of the air spring assembly provided in an embodiment of this application;

[0038] Figure 5 for Figure 4 A schematic diagram of the structure from another direction;

[0039] Figure 6 for Figure 5 A cross-sectional view along the BB direction;

[0040] Figure 7 for Figure 1 A sectional view along the CC direction;

[0041] Figure 8 for Figure 3 A magnified schematic diagram of the local structure at point D.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Piston body; 2. Nut; 3. Reinforcing ring;

[0044] 10. Piston structure; 11. Gas passage; 12. Main body; 13. Connecting part; 14. Anti-slip teeth; 15. Annular extension part; 20. Airbag; 30. Gas connector; 40. Protective sleeve; 50. Inner support ring; 60. End cap; 70. End cap fastening ring; 80. Limiting ring; 90. First dust cover;

[0045] 111. First channel section; 112. Second channel section; 121. Groove; 122. First annular surrounding plate; 123. Second annular surrounding plate; 124. Bottom plate; 125. Partition plate; 126. Chamber; 127. Reinforcing plate; 201. Annular cavity; 100. Second dust cover; 110. Clamp; 120. Dust cover fixing ring; 130. Piston locking ring; 140. Surface bearing;

[0046] 1121. Transition wall; 1122. Curved wall; 1123. Inclined wall. Detailed Implementation

[0047] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0048] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0049] In related technologies, the threaded structure connecting the air spring piston to the pipeline mainly adopts two molding methods: one is to integrally mold the plastic thread through injection molding, and the other is to use a tap to self-tap the thread after injection molding. Both methods rely on the mechanical properties of the plastic material itself, but the torsional strength of plastic threads is limited. Furthermore, the low mechanical strength of plastic threads makes it difficult to meet the torque requirements of pipeline connections. Under repeated assembly or vibration conditions, the threads are prone to stripping, leading to decreased airtightness or even air leakage.

[0050] Based on this, the embodiments of this application provide a piston structure, an air spring assembly, and a vehicle, which can improve the structural strength at the connection between the piston structure and the pipeline, avoid stripping to a certain extent, and improve air tightness.

[0051] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0052] Please combine Figures 1 to 3 , Figure 1 This is a three-dimensional structural diagram of the piston structure provided in the embodiments of this application. Figure 2 This is an exploded view of the piston structure provided in an embodiment of this application. Figure 3 for Figure 1 A cross-sectional view along the AA direction. As shown in the figure, this embodiment provides a piston structure 10, including a piston body 1 and a nut 2; the piston body 1 has a gas passage 11, one end of which is used to communicate with a gas pipe.

[0053] Please continue to combine Figures 4 to 6 , Figure 4 This is a schematic diagram of a partial structure of the air spring assembly provided in an embodiment of this application. Figure 5 for Figure 4 A structural diagram from another direction. Figure 6 for Figure 5 A cross-sectional view along the BB direction. The other end of the gas passage 11 is used to communicate with the airbag 20; the nut 2 is used to connect with the air tube, the nut 2 is embedded in the end of the gas passage 11 near the air tube, and part of the piston body 1 covers the end of the nut 2 away from the air tube.

[0054] In other words, a nut 2 is embedded at the end of the gas passage 11 near the gas pipe. This nut 2 is threadedly connected to the gas pipe, and the injection-molded material of the piston body 1 covers the end of the nut 2 away from the gas pipe, securing it firmly. This not only enhances the torsional strength of the threads, effectively preventing stripping, but also ensures airtightness, avoiding loosening and leakage caused by repeated disassembly or vibration to a certain extent. Simultaneously, the embedding of the metal nut 2 makes the gas pipe connection more stable, capable of withstanding higher tightening torque, thereby improving the overall durability and assembly efficiency of the air spring assembly provided in this embodiment.

[0055] In some specific embodiments, the piston body 1 includes a main body portion 12 and a connecting portion 13 connected together. A gas passage 11 is formed within the main body portion 12, and the connecting portion 13 is used to connect with the airbag 20. Anti-slip teeth 14 are provided on the outer periphery of the connecting portion 13. These anti-slip teeth 14 form multiple mechanical engagements when connected to the airbag 20. This design not only prevents loosening of the connection due to vibration or pressure fluctuations to a certain extent, but also significantly reduces the risk of tooth slippage by increasing the frictional resistance of the contact surface. It is particularly noteworthy that the structural features of the anti-slip teeth 14 enable the connecting portion 13 to maintain a stable connection state when subjected to the periodic pressure impacts of the airbag 20, avoiding the fretting wear problem that easily occurs on traditional smooth connection surfaces.

[0056] The gas passage 11 includes a first passage section 111 and a second passage section 112 that are perpendicular to and connected to each other. The first passage section 111 is used to connect with the air pipe, and the second passage section 112 is used to connect with the airbag 20. The nut 2 is embedded in the first passage section 111. In this way, through the vertical steering structural design, the two functional interfaces of the air pipe connection and the airbag 20 connection can be compactly arranged, saving installation space and providing greater flexibility for the layout of the air spring assembly in the vehicle chassis.

[0057] Furthermore, the design of directly embedding the nut 2 within the first channel section 111 not only shortens the airflow path and reduces pressure loss, but also, through the integrated structure of the metal nut 2 and the plastic gas channel 11, forms a reliable mechanical connection and sealing barrier at the gas pipe interface. This, to a certain extent, avoids the leakage risks that may exist with traditional segmented connections.

[0058] It should be noted that the piston body 1 described above is made of nylon plastic material. No specific limitation is made regarding the material of the piston body 1.

[0059] Furthermore, the wall thickness of the piston body 1 affects the appearance of the part in the following ways: uneven wall thickness will cause surface shrinkage (including shrinkage marks, pits, thickness marks, and other appearance defects), accompanied by warping deformation, and will cause negative phenomena such as insufficient strength and air leakage in the product; excessive wall thickness will easily produce defects such as surface shrinkage and internal shrinkage cavities; insufficient wall thickness may lead to problems such as material shortage, ejector pin marks, and warping deformation.

[0060] Because plastic materials have a certain shrinkage rate, overall external shrinkage after molding is unavoidable, resulting in the molded part being smaller than the mold cavity size, which is normal. However, concentrated internal shrinkage is the root cause of surface shrinkage and internal shrinkage cavities.

[0061] In areas with greater wall thickness, uneven cooling occurs, with the melt close to the mold surface cooling faster, while the melt near the center of the plastic part's thickness cools slower. When the central melt cools and contracts, it exerts a pulling force on the plastic part's surface. If the surface strength is high and the surface material is not pulled in, a vacuum bubble will form in the center of the plastic part; if the surface strength is low and the surface material is pulled in, a depression will form on the plastic part's surface.

[0062] Therefore, as Figure 3 As shown, in some optional embodiments, a groove 121 extending toward the airbag 20 is formed at the bottom of the main body 12. This ensures the uniformity of the wall thickness of the main body 12, effectively avoiding defects such as shrinkage cavities and stress concentration caused by abrupt changes in wall thickness during injection molding, thereby improving the molding quality and structural reliability of the product.

[0063] Furthermore, the extension direction of the groove 121 is coordinated with the expansion direction of the airbag 20, allowing it to better adapt to deformation during the inflation process of the airbag 20, reducing local stress, and thus extending the service life of the piston structure 10. Simultaneously, this uniform wall thickness design makes the material distribution more rational, ensuring structural strength while avoiding unnecessary material waste, achieving a perfect balance between lightweight and structural strength. More importantly, the uniform wall thickness distribution makes the stress distribution of the piston structure 10 provided in this embodiment more uniform when subjected to alternating loads, preventing premature failure due to local weak points to a certain extent, and providing a reliable guarantee for the stable operation of the air spring assembly under long-term vibration conditions.

[0064] For specific details, please refer to... Figure 7 , Figure 7 for Figure 1 A cross-sectional view along the CC direction. In this embodiment, the main body 12 includes a first annular surrounding plate 122, a second annular surrounding plate 123, a bottom plate 124, and a plurality of partitions 125. The first annular surrounding plate 122 is located inside the second annular surrounding plate 123. The bottom plate 124 is connected to the first annular surrounding plate 122 and the second annular surrounding plate 123, and the bottom plate 124 is connected to the connecting part 13. The groove 121 mentioned above is formed on the bottom plate 124.

[0065] Furthermore, multiple partitions 125 are arranged at intervals along the circumference of the first annular surrounding plate 122, and the multiple partitions 125 are connected between the first annular surrounding plate 122 and the second annular surrounding plate 123. Among them, a gas channel 11 is formed on one partition 125, and the thickness of this partition 125 is greater than the thickness of the other partitions 125. Two adjacent partitions 125, together with the first annular surrounding plate 122, the second annular surrounding plate 123 and the bottom plate 124, form a chamber 126. A groove 121 is formed on the bottom wall of the chamber 126, and a groove 121 is provided on the bottom wall of each chamber 126.

[0066] Thus, by dividing the main body 12 into multiple independent chambers 126, each chamber 126 has a groove 121 with uniform wall thickness at the bottom. This honeycomb structure not only significantly improves the overall rigidity but also optimizes the stress distribution, enabling the piston structure 10 to uniformly transfer the load to the entire structure when subjected to the pressure of the airbag 20.

[0067] Furthermore, integrating the gas channel 11 into the thickened partition 125 not only ensures the structural strength of the gas channel 11 but also cleverly utilizes the thickness difference of the partition 125 to achieve functional zoning. The synergistic effect of multiple chambers 126 effectively suppresses local deformation, while the uniform groove design 121 ensures the consistency of material flow in each chamber during injection molding, thus avoiding common shrinkage marks and warpage problems to a certain extent.

[0068] In some alternative embodiments, in order to improve the structural strength of the main body 12, a plurality of reinforcing plates 127 evenly distributed along the circumference of the first annular surrounding plate 122 may be connected between the first annular surrounding plate 122 and the bottom plate 124.

[0069] Specifically, these reinforcing plates 127, which are evenly arranged along the circumference, form a radial reinforcing network between the first annular surrounding plate 122 and the bottom plate 124, so that the piston structure 10 provided in this embodiment can achieve optimal force transmission and dispersion through the synergistic effect of each reinforcing plate 127 when subjected to multi-directional loads from the airbag 20.

[0070] In this way, not only is it ensured that the piston structure 10 provided in this embodiment has consistent resistance to deformation in all directions, but more importantly, a complete force transmission path is established: when the piston structure 10 is subjected to axial pressure, the load can be uniformly transmitted to the first annular surrounding plate 122 through each reinforcing plate 127; while when subjected to radial force, the circumferentially arranged reinforcing plates 127 can form a continuous support ring, effectively suppressing the elliptic deformation of the annular structure.

[0071] Moreover, the uniformly distributed reinforcing plates 127 can guide the orderly flow of the melt during injection molding, improve the uniformity of filling, and to a certain extent avoid shrinkage deformation caused by uneven cooling, thereby ensuring the dimensional accuracy of the product.

[0072] Please continue to combine Figure 8 , Figure 8 for Figure 3 A magnified schematic diagram of the partial structure at point D. In some embodiments, to improve the smoothness of airflow and reduce noise, a transition wall 1121 is formed on the sidewall of the second channel segment 112, with the transition wall 1121 facing the first channel segment 111. Thus, the provision of the transition wall 1121 can improve the smoothness of gas flow and reduce noise.

[0073] Specifically, the transition wall 1121 includes an arcuate wall 1122 and an inclined wall 1123 connected together; the arcuate wall 1122 is located on the side of the inclined wall 1123 away from the airbag 20, and the arcuate wall 1122 is concave in the direction away from the first channel segment 111; the inclined wall 1123 extends from the side near the first channel segment 111 to the side away from the first channel segment 111 in the direction from away from the airbag 20 to near the airbag 20.

[0074] Thus, when the airflow enters the second channel section 112 from the first channel section 111, the concave design of the arc-shaped wall 1122 can effectively guide the airflow to turn smoothly, avoid turbulence, thereby reducing airflow noise and improving gas delivery efficiency; while the inclined extension of the inclined wall 1123 further optimizes the airflow path, ensuring that compressed air can smoothly enter the airbag 20 and reduce pressure loss.

[0075] In this way, not only is the aerodynamic performance improved, but its geometric features also enhance the local structural strength. The concave design of the arc-shaped wall 1122 can better disperse stress when subjected to airbag pressure, while the extension direction of the inclined wall 1123 is optimally matched with the airflow direction, which not only ensures smooth airflow but also improves the deformation resistance of the channel wall.

[0076] To enhance the structural strength of the piston structure 10 provided in this embodiment, the piston structure 10 also includes a reinforcing ring 3, which is disposed within the connecting portion 13. In other words, the reinforcing ring 3 serves as an internal reinforcing skeleton for the connecting portion 13, enhancing its structural rigidity and enabling it to better resist deformation when subjected to the periodic high-pressure impact of the airbag 20. This, to a certain extent, avoids the problem of fatigue cracking of the connecting portion 13 due to long-term stress.

[0077] Meanwhile, the addition of the reinforcing ring 3 optimizes the stress distribution of the connecting part 13, effectively dispersing the stress peaks that were originally concentrated at the junction of the connecting part 13 and the main body 12, greatly reducing the risk of stress concentration in this critical area. This built-in reinforcing structure also cleverly maintains the integrity of the outer surface of the connecting part 13, ensuring that the function of the anti-slip teeth 14 is not affected, thus guaranteeing both the connection strength with the airbag 20 and the ease of assembly.

[0078] It should be noted that the reinforcing ring 3 is also embedded in the connecting part 13. That is to say, in this embodiment, the piston body 1, the nut 2 and the reinforcing ring 3 are connected together by injection molding.

[0079] In some specific embodiments, the nut 2 is a copper nut 2. It should be noted that copper has excellent corrosion resistance and can effectively resist oxidation and electrochemical corrosion in harsh environments such as humidity and salt spray, thereby extending the service life of the piston structure 10 provided in this embodiment.

[0080] Meanwhile, the ductility and self-lubricating properties of copper make the threaded connection less prone to wear during repeated disassembly and assembly, further reducing the risk of stripping. The slight plastic deformation of copper can also fill the mating gap, further enhancing airtightness and ensuring the pressure stability of the air spring assembly.

[0081] like Figures 4 to 6 As shown, this embodiment also provides an air spring assembly, including an air tube (not shown in the figure), an air bladder 20, and the aforementioned piston structure 10; wherein, the air tube is connected to one end of the gas channel 11, and the air bladder 20 is connected to the other end of the gas channel 11. It should be noted that the piston structure 10 has been described in detail in the above embodiments, and will not be repeated here.

[0082] Furthermore, the air spring assembly provided in this embodiment also includes an air connector 30, which is connected between the nut 2 and the air pipe. In this way, communication between the air pipe and the piston body 1 can be achieved.

[0083] To protect the airbag 20 and prevent damage to it to some extent, the air spring assembly provided in this embodiment also includes a protective sleeve 40, which is fitted over the outside of the airbag 20. This extends the service life of the airbag 20, thereby further extending the service life of the air spring assembly provided in this embodiment.

[0084] Understandably, although the airbag 20 is a flexible component, it still needs to have a certain structural strength. Therefore, an inner support ring 50 can be set inside the airbag 20. The setting of the inner support ring 50 can improve the structural strength of the airbag 20 and maintain the airbag 20 with good performance.

[0085] In order to achieve the connection between the airbag 20 and the connecting part 13, the air spring assembly provided in this embodiment also includes a piston retaining ring 130, and the airbag 20 forms an annular cavity 201 that is connected to the piston retaining ring 130.

[0086] Furthermore, an end cap 60 is connected to the end of the airbag 20 away from the connecting part 13. In order to connect the end cap 60 and the airbag 20, an end cap fastening ring 70 is also provided on the outside of the airbag 20, and a limiting ring 80 is sleeved on the outside of the end cap fastening ring 70. In this way, the connection between the airbag 20 and the end cap 60 can be realized.

[0087] To improve the sealing performance of the air spring assembly provided in this embodiment, a first dust cover 90 is provided between the sleeve 40 and the end cap 60. The sealing performance of the air spring assembly can be improved by providing the first dust cover 90.

[0088] Furthermore, the air spring assembly provided in this embodiment also includes a second dust cover 100, which covers the outside of the piston body 1. Specifically, a clamp 110 is provided on the outside of the sleeve 40, and one end of the second dust cover 100 is connected to the clamp 110 through a dust cover fixing ring 120 sleeved on the outside of the second dust cover 100. In this way, the sealing performance of the air spring assembly provided in this embodiment can be further improved.

[0089] The outer side of the main body 12 is also connected to an annular extension 15, and the other end of the second dust cover 100 is connected to the annular extension 15. The first channel section 111 is located on the side of the annular extension 15 away from the airbag 20.

[0090] In order to maintain the basic performance of the air spring assembly provided in this embodiment, a plane bearing 140 is also provided on the side of the main body 12 away from the connecting part 13.

[0091] The air spring assembly provided in this embodiment has strong stability and reliability in use by adopting the piston structure 10 described above.

[0092] This embodiment also provides a vehicle, including a body and the aforementioned air spring assembly; the air spring assembly is mounted on the body. Specifically, the air spring assembly is connected to the upper strut of the body via a plug-in connection.

[0093] The vehicle provided in this embodiment improves the comfort and stability of the vehicle by adopting the air spring assembly described above.

[0094] 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 scope of the technology 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. A piston structure, characterized in that, include: The piston body has a gas passage, one end of which is used to communicate with a gas tube, and the other end of which is used to communicate with an air bladder; as well as A nut is used to connect to the air tube. The nut is fitted into the end of the gas passage near the air tube, and a portion of the piston body covers the end of the nut away from the air tube.

2. The piston structure according to claim 1, characterized in that, The gas channel includes a first channel segment and a second channel segment that are perpendicular to each other and connected. The first channel segment is used to communicate with the trachea, and the second channel segment is used to communicate with the airbag. The nut is embedded in the first channel section.

3. The piston structure according to claim 2, characterized in that, A transition wall is formed on the sidewall of the second channel segment, and the transition wall faces the first channel segment.

4. The piston structure according to claim 3, characterized in that, The transition wall includes an arc-shaped wall and an inclined wall connected together; The arc-shaped wall is located on the side of the inclined wall away from the airbag, and the arc-shaped wall is concave in the direction away from the first channel segment; The inclined wall extends from the side closer to the first channel segment to the side farther away from the first channel segment in a direction from away from the airbag to closer to the airbag.

5. The piston structure according to claim 1, characterized in that, The piston body includes a main body portion and a connecting portion connected together, the gas passage is formed in the main body portion, and the connecting portion is used to connect with the airbag; The bottom of the main body has a groove extending toward the airbag.

6. The piston structure according to claim 5, characterized in that, It also includes a reinforcing ring disposed within the connecting portion; and / or, The main body has multiple independent chambers, and each chamber has a groove formed on its bottom wall.

7. The piston structure according to any one of claims 1 to 6, characterized in that, The nut is a copper nut.

8. An air spring assembly, characterized in that, Includes a trachea, an airbag, and a piston structure as described in any one of claims 1 to 7; The air tube is connected to the nut, and one end of the air tube is connected to the gas channel; The airbag is connected to the piston body, and the airbag is connected to the other end of the gas channel.

9. The air spring assembly according to claim 8, characterized in that, It also includes an air connector, which is connected between the nut and the air tube.

10. A vehicle, characterized in that, Includes the vehicle body and the air spring assembly as described in claim 8 or 9; The air spring assembly is mounted on the vehicle body.

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