Air spring for vehicle

Abstract

The utility model relates to air spring technical field especially is concerned about an air spring for car, including two cover plates, two flanges fixed on two cover plates through screw rod, rubber air bag fixed between two cover plates, rubber air bag end part is installed between flange and cover plate, one end of screw rod is cooperated with flange thread and is provided with lock nut, lock nut is rotatably connected with connecting plate, and the one end away from lock nut of connecting plate is provided with the jacking screw for jacking flange and is set up threadedly, can be adjusted flange position through jacking screw after assembling, effectively makes up installation error, ensures rubber air bag end part and flange, cover plate close adhesion, improves rubber air bag sealed place seal effect, and the jacking effect of jacking screw can strengthen structure anti - loosening ability, adapts to the complex working condition such as automobile road surface vibration, further improves the sealed stability and service life of air spring.

Description

Technical Field

[0001] This utility model relates to the field of air spring technology, and in particular to an air spring for automobiles. Background Technology

[0002] Air springs, as key shock-absorbing components in the automotive and aerospace industries, achieve their elastic effect through the compressibility of compressed air within a sealed container, commonly known as an airbag. Their performance directly depends on the sealing reliability of the air chamber and the stability of the structural assembly. In automotive applications, air springs must withstand road vibrations, pressure fluctuations, and impacts from complex operating conditions over extended periods. If the sealing structure is loose or the assembly precision is insufficient, gas leakage can easily occur, significantly reducing shock absorption and affecting vehicle ride comfort. Furthermore, structural failure could lead to safety hazards. Therefore, optimizing the sealing performance and assembly adjustability of air springs has become a core requirement in the industry for improving their service life and reliability.

[0003] Chinese patent CN222798016U discloses a sealing structure for an air spring chamber. The structure includes an air spring, an air chamber, and an air spring connecting plate. The air spring is divided into upper and lower parts. An outer waist ring is fixed by an adhesive tape, and a nut is used to pass through the air spring connecting plate, sealing cover plate, and flange ring. The components are fixed with the help of a locking washer, which improves the air chamber sealing performance to a certain extent and provides a reference for the sealing design of air springs.

[0004] However, the structural design of the aforementioned comparative documents still has obvious limitations and cannot meet the higher requirements of the automotive industry for the flexibility of air spring assembly and long-term sealing stability: the flange ring and the air spring connecting plate are fixed in an integrated manner with nuts passing through. After assembly, it is impossible to make fine adjustments to the rubber airbag seal according to the actual installation error or changes in working conditions. As a result, the fitting accuracy of the rubber air spring end with the flange and cover plate is easily affected by assembly deviations, which indirectly weakens the sealing effect. Utility Model Content

[0005] To address the problem that the nut penetrating the rubber air spring affects the sealing effect, this utility model provides an air spring for automobiles.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: An automotive air spring includes two cover plates, two flanges fixed to the cover plates by screws, and a rubber air bladder fixed between the two cover plates. The end of the rubber air bladder is installed between the flanges and the cover plates. A locking nut is threaded onto one end of the screw and fits with the flange thread. A connecting plate is rotatably connected to the locking nut. A pressing screw for pressing the flange is threaded onto the end of the connecting plate away from the locking nut. This automotive air spring uses screws to fix the flanges to the cover plates, and the connecting plate and pressing screw, which are rotatably connected with the locking nut, allow for fine-tuning of the flange position after assembly using the pressing screw. This effectively compensates for installation errors, ensuring a tight fit between the end of the rubber air bladder and the flange and cover plates, improving the sealing effect of the rubber air bladder. Simultaneously, the tightening action of the pressing screw enhances the structure's resistance to loosening, adapting to complex operating conditions such as road vibrations, further improving the sealing stability and service life of the air spring.

[0007] Preferably, a circular tube is coaxially fixed to one end of the locking nut; a limiting ring is coaxially fixed to the end of the circular tube away from the locking nut; the connecting plate is rotatably mounted on the circular tube and positioned between the limiting ring and the locking nut. This provides a stable coaxial rotational support for the connecting plate, ensuring that it can rotate flexibly around the circular tube to adjust the flange position in conjunction with the top-pressure screw. Furthermore, the bidirectional limiting by the limiting ring and the locking nut prevents the connecting plate from axially shifting or falling off during use, further improving the structural assembly stability, adapting to vibration conditions during vehicle operation, and ensuring the long-term reliable operation of the top-pressure fine-tuning function.

[0008] Preferably, the connecting plate has a through hole fitted to the round tube; the through hole and the outer wall of the round tube are interference-fitted; a threaded hole is formed at the end of the connecting plate away from the through hole; a top-pressing screw is installed in the threaded hole; the outer diameter of the limiting ring is larger than the inner diameter of the through hole. The interference fit between the through hole and the round tube on the connecting plate ensures the structural stability of the connecting plate when rotating around the round tube, preventing loosening and displacement, and also allows for precise adjustment of the top pressure through the threaded fit between the threaded hole and the top-pressing screw; at the same time, the outer diameter of the limiting ring is larger than the inner diameter of the through hole, which can effectively prevent the connecting plate from axially dislodging. These multiple designs together improve the assembly reliability and adjustment accuracy of the structure, making it suitable for long-term stable use under automotive vibration conditions.

[0009] Preferably, the flange comprises two opposing semicircular rings; each semicircular ring has a limiting groove on one side to accommodate a top-pressing screw. The flange's use of two opposing semicircular rings facilitates the installation of the rubber airbag end, particularly suitable for space-constrained scenarios during automotive air spring assembly; simultaneously, the limiting groove on the side of the semicircular rings precisely engages with the top-pressing screw, limiting its offset or slippage during adjustment, ensuring stable pressure applied to the flange, further guaranteeing the tight seal between the rubber airbag end and the flange and cover plate, and improving the structural stability under automotive vibration conditions.

[0010] Preferably, a circular ring plate is fixedly mounted on the cover plate; the end of the rubber airbag is located on the outside of the circular ring plate and positioned between the cover plate, flange, and circular ring plate. The circular ring plate on the cover plate provides additional support for the end of the rubber airbag, forming a three-sided clamping structure with the cover plate and flange. This increases the contact area of ​​the rubber airbag end and enhances the fixing stability through multiple limiting mechanisms, effectively preventing displacement or loosening of the airbag end caused by vehicle vibration, further improving sealing reliability, and ensuring long-term stable operation of the air spring.

[0011] Preferably, a circular boss is fixedly provided at the center of the outer side of the circular plate; a pipe clamp is installed on the outside of the rubber airbag; the pipe clamp is set to fit with the end of the circular plate. The circular boss on the outer side of the circular plate can fit tightly with the inner side of the rubber airbag, which not only reduces the local extrusion stress at the end of the airbag and avoids wear from long-term use, but also fills the gap to solidify the sealing foundation; the pipe clamp on the outside of the rubber airbag is set to fit with the end of the circular plate, forming a clamping fixation on the airbag from the outside, and forming a double limit with the circular boss, effectively preventing the displacement or loosening of the airbag end caused by vehicle vibration, further ensuring the sealing reliability and structural stability of the air spring.

[0012] Preferably, an adhesive layer is provided on the outer wall between the end of the circular ring plate and the circular ring boss. This adhesive layer on the outer wall between the end of the circular ring plate and the circular ring boss allows the inner side of the rubber airbag to fit tightly against the outer wall of the circular ring plate, effectively filling the gaps and improving initial sealing. Simultaneously, the adhesive layer enhances the stability of the connection between the two, preventing relative displacement between the end of the rubber airbag and the circular ring plate due to vehicle vibrations, further strengthening sealing reliability and ensuring long-term stable operation of the air spring.

[0013] Preferably, several raised strips are fixedly provided on the contact surface between the end of the rubber airbag and the flange; a sealing groove is formed on the flange to match the raised strips. The raised strips at the end of the rubber airbag and the sealing groove on the flange form a multi-layered convex-concave mating structure, which can significantly increase the tightness of the contact surface between the two, effectively blocking gas leakage through multiple sealing barriers; at the same time, the convex-concave mating can enhance the structural resistance to displacement under vibration conditions, avoid sealing failure caused by relative sliding of the contact surfaces, and further improve the sealing reliability of the air spring.

[0014] Preferably, a plurality of cylindrical platforms are fixedly provided on the contact surface between the end of the rubber airbag and the cover plate. These cylindrical platforms increase the contact friction between the two, effectively preventing relative sliding between the airbag and the cover plate caused by vehicle vibrations. They also distribute the force on the end of the airbag through the supporting effect of the cylindrical platforms, avoiding excessive local compression and wear. Simultaneously, the cylindrical platforms fill the gaps in the fit, helping to improve the sealing effect of the contact surface and further ensuring the structural stability and sealing reliability of the air spring.

[0015] Preferably, a vent is provided in the middle of the cover plate.

[0016] The beneficial effects of this utility model are: This automotive air spring uses screws to fix the flange to the cover plate, with the rubber airbag end positioned between the flange and the cover plate. A connecting plate and a top-pressing screw, connected by a locking nut, allow for fine-tuning of the flange position after assembly. This effectively compensates for installation errors, ensuring a tight fit between the rubber airbag end and the flange and cover plate, improving the sealing effect of the rubber airbag. Simultaneously, the tightening action of the top-pressing screw enhances the structure's resistance to loosening, adapting to complex operating conditions such as road vibrations, further improving the air spring's sealing stability and service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0020] Figure 4 This is an exploded structural diagram of the screw, round tube, and limiting ring of this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the cover plate of this utility model.

[0022] Figure 6 This is a schematic diagram of the semi-circular ring structure of the flange of this utility model. Figure 1 .

[0023] Figure 7 This is a schematic diagram of the semi-circular ring structure of the flange of this utility model. Figure 2 .

[0024] Figure 8 This is a schematic diagram of the structure of the rubber airbag of this utility model.

[0025] In the diagram: 1-cover plate, 2-screw, 3-flange, 4-rubber airbag, 5-locking nut, 6-connecting plate, 7-pressing screw, 8-round pipe, 9-limiting ring, 10-fixing nut, 11-pipe clamp; 101-Circular ring plate, 102-Circular ring boss, 103-Ventilation port; 301-Semi-circular ring, 302-Limiting groove, 303-Sealing groove; 401-Raised strip, 402-Cylindrical platform; 601-Through hole, 602-Threaded hole. Detailed Implementation

[0026] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0027] Example 1 like Figure 1-2 As shown, an automotive air spring includes two cover plates 1, two flanges 3 respectively fixed to the two cover plates 1 by screws 2, and a rubber air bladder 4 fixed between the two cover plates 1. The end of the rubber air bladder 4 is installed between the flanges 3 and the cover plates 1. One end of the screw 2 is threaded with a locking nut 5 to mate with the flange 3, and the other end of the screw 2 is threaded with a fixing nut 10. A connecting plate 6 is rotatably connected to the locking nut 5. A pressing screw 7 for pressing against the flange 3 is threaded on the end of the connecting plate 6 away from the locking nut 5. A vent 103 is provided in the middle of the cover plate 1.

[0028] The automotive air spring uses screws 2 to fix flanges 3 to cover plates 1 and rubber air bladder 4 to the end between flanges 3 and cover plates 1. A connecting plate 6 and a top-pressing screw 7 are rotatably connected by a locking nut 5. After assembly, the position of flange 3 can be finely adjusted using the top-pressing screw 7, effectively compensating for installation errors and ensuring a tight fit between the end of the rubber air bladder 4 and flanges 3 and cover plates 1, thus improving the sealing effect of the rubber air bladder 4. Simultaneously, the tightening action of the top-pressing screw 7 enhances the structure's resistance to loosening, adapting to complex operating conditions such as road vibrations, further improving the sealing stability and service life of the air spring.

[0029] In the above settings, such as Figure 3 and Figure 4 As shown, a round tube 8 is coaxially fixed at one end of the locking nut 5; a limiting ring 9 is coaxially fixed at the end of the round tube 8 away from the locking nut 5; a connecting plate 6 is rotatably mounted on the round tube 8 and positioned between the limiting ring 9 and the locking nut 5. A through hole 601 is provided on the connecting plate 6 to mate with the round tube 8; the through hole 601 and the outer wall of the round tube 8 are interference-fitted; a threaded hole 602 is provided at the end of the connecting plate 6 away from the through hole 601; a pressing screw 7 is provided internally in the threaded hole 602; the outer diameter of the limiting ring 9 is larger than the inner diameter of the through hole 601.

[0030] The design provides stable coaxial rotational support for the connecting plate 6, ensuring its flexible rotation around the circular tube 8 to adjust the position of the flange 3 in conjunction with the top-pressure screw 7. Furthermore, the bidirectional limiting effect of the limiting ring 9 and the locking nut 5 prevents the connecting plate 6 from axially shifting or falling off along the circular tube 8 during use, further enhancing structural assembly stability and adapting to vibration conditions during vehicle operation, ensuring long-term reliable operation of the top-pressure fine-tuning function. The through hole 601 on the connecting plate 6 is interference-fitted with the circular tube 8, ensuring structural stability when the connecting plate 6 rotates around the circular tube 8 and preventing loosening or displacement. The threaded hole 602 and the threaded engagement with the top-pressure screw 7 enable precise adjustment of the top-pressure pressure. Simultaneously, the outer diameter of the limiting ring 9 is larger than the inner diameter of the through hole 601, effectively preventing the connecting plate 6 from axially dislodging. These multiple design features collectively improve the assembly reliability and adjustment accuracy of the structure, making it suitable for long-term stable use under vehicle vibration conditions.

[0031] like Figure 5-7 As shown, flange 3 includes two opposing semicircular rings 301; each semicircular ring 301 has a limiting groove 302 on one side surface that fits the pressing screw 7. A circular ring plate 101 is fixedly mounted on cover plate 1; the end of rubber airbag 4 is located outside the circular ring plate 101 and is positioned between cover plate 1, flange 3, and circular ring plate 101. A circular ring boss 102 is fixedly mounted in the middle of the outer side of circular ring plate 101; a pipe clamp 11 is installed on the outside of rubber airbag 4; the pipe clamp 11 is fitted to the end of circular ring plate 101. An adhesive layer is provided on the outer wall between the end of circular ring plate 101 and the circular ring boss 102.

[0032] Flange 3 employs a structure of two opposing semicircular rings 301, facilitating the installation of the rubber airbag 4 at its end, particularly suitable for space-constrained scenarios during automotive air spring assembly. Simultaneously, the limiting groove 302 on the side of the semicircular ring 301 precisely engages with the top-pressing screw 7, limiting its offset or slippage during adjustment and ensuring stable pressure applied to flange 3. This further guarantees the tight seal between the rubber airbag 4 end and flange 3 and cover plate 1, enhancing structural stability under automotive vibration conditions. The circular ring plate 101 on cover plate 1 provides additional support for the rubber airbag 4 end, forming a three-sided clamping structure with flange 3. This increases the contact area of ​​the rubber airbag 4 end and strengthens its fixation stability through multiple limiting mechanisms, effectively preventing displacement or loosening of the airbag end due to vehicle vibration, further improving sealing reliability and ensuring long-term stable operation of the air spring. The annular boss on the outer side of the annular plate 101 can fit tightly against the inner side of the rubber airbag 4, reducing local compressive stress at the airbag end, preventing wear from long-term use, and filling the gap to solidify the sealing foundation. The tube clamp 11 on the outside of the rubber airbag 4 is set with the end of the annular plate 101, forming a clamp and fixation of the airbag from the outside, and forming a double limit with the annular boss, effectively preventing displacement or loosening of the airbag end caused by vehicle vibration, further ensuring the sealing reliability and structural stability of the air spring. The adhesive layer on the outer wall between the end of the annular plate 101 and the annular boss allows the inner side of the rubber airbag 4 to fit tightly against the outer wall of the annular plate 101, effectively filling the gap to improve the initial sealing performance; at the same time, the adhesive layer can enhance the connection stability between the two, preventing relative displacement between the end of the rubber airbag 4 and the annular plate 101 caused by vehicle vibration, further strengthening the sealing reliability and ensuring the long-term stable operation of the air spring.

[0033] like Figure 3 and Figure 8 As shown, several raised strips 401 are fixedly provided on the contact surface between the end of the rubber airbag 4 and the flange 3; a sealing groove 303 is provided on the flange 3 to mate with the raised strips 401. Several cylindrical platforms 402 are fixedly provided on the contact surface between the end of the rubber airbag 4 and the cover plate 1.

[0034] The raised strip 401 at the end of the rubber airbag 4 and the sealing groove 303 on the flange 3 form a multi-layered convex-concave mating structure, which can significantly increase the tightness of the contact surface between the two and effectively prevent gas leakage through multiple sealing barriers. At the same time, the convex-concave mating can enhance the structural resistance to displacement under vibration conditions, avoid sealing failure caused by relative sliding of the contact surface, and further improve the sealing reliability of the air spring. The several cylindrical platforms 402 on the contact surface between the end of the rubber airbag 4 and the cover plate 1 can not only increase the contact friction between the two and effectively prevent relative sliding of the airbag and the cover plate 1 caused by vehicle vibration, but also disperse the force on the end of the airbag through the supporting effect of the cylindrical platforms 402, avoiding local excessive compression and wear; at the same time, the cylindrical platforms 402 can fill the fitting gap, help improve the sealing effect of the contact surface, and further ensure the structural stability and sealing reliability of the air spring.

[0035] This automotive air spring operates on the core principle of "compressed air elasticity + multi-component collaborative sealing and fixing," and is suitable for automotive shock absorption needs. Elastic function realization: Compressed air is injected into the rubber airbag 4 through the vent 103 in the middle of the cover plate 1. The airbag uses the compressibility of air to form elastic support. When the car encounters road vibration or load changes, the airbag expands or contracts with pressure fluctuations to absorb impact energy and achieve shock absorption and ensure driving comfort. Sealing reliability assurance: The end of the rubber airbag 4 is fitted with the flange 3 through the "convex strip 401-sealing groove 303", the rubber airbag 4 is attached to the annular plate 101 by the adhesive layer, and the cylindrical platform 402 is in contact with the cover plate 1, forming multiple sealing barriers. At the same time, the cover plate 1, flange 3 and annular plate 101 form a three-sided clamp on the end of the airbag, and are externally tightened with pipe clamp 11, which effectively prevents compressed air leakage and ensures stable air chamber pressure. Structural adaptation and adjustment: During assembly, the flange 3, which includes two semi-circular rings 301, can be installed in sections to adapt to the space limitations. If there is an installation error, the connecting plate 6 connected by the locking nut 5 can be rotated, and the position of the flange 3 can be finely adjusted by pressing the top screw 7 to ensure that the ends of the rubber airbag 4 fit tightly. During operation, the limiting ring 9, the interference fit through hole 601, and the round tube 8 prevent the components from moving. The arc protrusion 401 disperses the stress of the airbag, which together ensures the structural stability under vibration conditions and achieves long-term reliable vibration reduction and sealing.

Claims

1. An air spring for a vehicle, comprising two cover plates (1), two flanges (3) fixed to the two cover plates (1) by a screw rod (2), and a rubber air bag (4) fixed between the two cover plates (1), characterized in that, The end of the rubber airbag (4) is installed between the flange (3) and the cover plate (1); one end of the screw (2) is threaded with the flange (3) and a locking nut (5); the locking nut (5) is rotatably connected to a connecting plate (6); the end of the connecting plate (6) away from the locking nut (5) is threaded with a pressing screw (7) for pressing the flange (3).

2. The air spring for an automobile according to claim 1, characterized by A round tube (8) is coaxially fixed at one end of the locking nut (5); a limiting ring (9) is coaxially fixed at the other end of the round tube (8) away from the locking nut (5); a connecting plate (6) is rotatably mounted on the round tube (8) and is positioned between the limiting ring (9) and the locking nut (5).

3. The air spring for an automobile according to claim 2, wherein The connecting plate (6) is fitted with a round tube (8) with a through hole (601); the through hole (601) and the outer wall of the round tube (8) are interference fit; a threaded hole (602) is provided on the end of the connecting plate (6) away from the through hole (601); a top screw (7) is provided in the internal thread of the threaded hole (602); the outer diameter of the limiting ring (9) is larger than the inner diameter of the through hole (601).

4. The air spring for an automobile according to claim 3, wherein The flange (3) includes two opposing semicircular rings (301); each semicircular ring (301) has a limiting groove (302) on one side surface that is fitted with a top screw (7).

5. The air spring for an automobile according to claim 4, wherein A circular ring plate (101) is fixedly installed on the cover plate (1); the end of the rubber airbag (4) is located outside the circular ring plate (101) and is located between the cover plate (1), the flange (3) and the circular ring plate (101).

6. The air spring for an automobile according to claim 5, wherein A circular boss (102) is fixedly installed in the middle of the outer side of the circular plate (101); a pipe clamp (11) is installed on the outside of the rubber airbag (4); the pipe clamp (11) is set at the end of the circular plate (101).

7. The air spring for an automobile according to claim 6, wherein An adhesive layer is provided on the outer wall between the end of the annular plate (101) and the annular boss (102).

8. The automotive air spring according to claim 1 or 7, characterized in that, Several raised strips (401) are fixedly provided on the contact surface between the end of the rubber airbag (4) and the flange (3); a sealing groove (303) is provided on the flange (3) to match the raised strips (401).

9. The automotive air spring according to claim 7, characterized in that, Several cylindrical platforms (402) are fixedly installed on the contact surface between the end of the rubber airbag (4) and the cover plate (1).

10. The automotive air spring according to claim 1, characterized in that, A vent (103) is provided in the middle of the cover plate (1).

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