Noise reduction type double-cavity air spring structure

Abstract

The utility model discloses a noise reduction type double-cavity air spring structure which comprises an upper top seat and a shock absorber, the upper top seat comprises an upper shell and a lower shell, the upper shell is arranged at the upper end of the lower shell, and a reinforcing structure is arranged on the upper shell; a piston is arranged outside the shock absorber, a bag skin is connected between the bottom end of the lower shell and the top end of the piston, a protective barrel is arranged outside the bag skin, a dust cover is arranged between the bottom end of the protective barrel and a piston cushion block, and the piston cushion block is arranged among the bottom of the piston, the shock absorber and the dust cover.

Description

Technical Field

[0001] The utility model belongs to the technical field of air springs, and specifically relates to a noise reduction type double-cavity air spring structure. Background Art

[0002] Currently, air springs are widely used in the field of vehicle shock absorption. The advantage of double-chamber air springs over single-chamber air springs is that the stiffness is adjustable. However, the double-chamber air spring has a relatively complex structure due to the arrangement of the stiffness valve. According to the overall vehicle layout, air springs are divided into integrated or split structures of shock absorber and air spring.

[0003] When the shock absorber and the air spring are an integrated structure, the upper end of the air spring is connected to the vehicle body through bolts, and the lower end of the shock absorber is connected to the lower arm through a bushing assembly or a ball pin. At present, the lower end of the shock absorber is mostly connected to the lower arm through a bushing assembly. Therefore, during the driving of the car, due to the insufficient friction between the piston and the shock absorber, the piston and the shock absorber are twisted and noise is generated. In addition, when the shock absorber and the air spring are an integrated structure, the stiffness valve is generally arranged on the upper seat. Due to the complex structure of the upper seat, plastic parts are generally used. However, the upper seat needs to contact the vehicle body and bear a large load, and the strength is insufficient. It is also necessary to design threaded holes to match the bolts. Since the bolts need to be disassembled many times and the tightening torque is large, the thread often slips.

[0004] The utility model patent with announcement number CN208982568U was published on June 14, 2019, and is named a nitrogen spring with noise reduction and anti-seizure function. The nitrogen spring includes a cylinder body, a piston rod and a bushing assembly, wherein the bushing assembly is installed in the cylinder body, a noise reduction groove is provided on the upper end surface of the piston rod, the lower part of the piston rod is inserted into the bushing assembly and extends into the cylinder body, a sealing element is provided between the piston rod and the bushing assembly, the lower end of the piston rod extends to its circumference to form a limiting step, and a groove is provided in the center of the lower end of the piston rod. The nitrogen spring cannot solve the problem of thread stripping. Utility Model Content

[0005] The utility model aims to provide a noise-reducing double-chamber air spring structure with reliable connection effect, which can reduce noise and address the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The noise reduction double-chamber air spring structure includes an upper top seat and a shock absorber, wherein the upper top seat includes an upper shell and a lower shell, wherein the upper shell is arranged at the upper end of the lower shell, and a reinforcement structure is arranged on the upper shell; a piston is arranged outside the shock absorber, a bladder skin is connected between the bottom end of the lower shell and the top end of the piston, a protective sleeve is arranged outside the bladder skin, a dust cover is arranged between the bottom end of the protective sleeve and the piston pad, and a piston pad is arranged between the bottom of the piston, the shock absorber and the dust cover.

[0008] The reinforcement structure includes a mounting plate, which is embedded in the upper end of the upper shell body. The upper end of the mounting plate and the upper end of the upper shell body are in the same plane. A mounting seat is provided at the end of the mounting plate, and a screw sleeve is embedded in the mounting seat. A waist-shaped platform is provided at the bottom of the screw sleeve, and the waist-shaped platform extends from the bottom of the mounting plate. A limiting boss is provided at the end of the mounting plate, and one side of the limiting boss is arranged parallel to the side of the waist-shaped platform. A gap is provided between the limiting boss and the waist-shaped platform.

[0009] The shock absorber includes a shock absorber outer cylinder, the piston pad is sleeved on the shock absorber outer cylinder, and a piston sealing ring is provided between the shock absorber outer cylinder, the bottom end of the piston and the end of the piston pad; a shock absorber tray is fixedly connected to the shock absorber outer cylinder, and the shock absorber tray abuts against the inner side of the piston pad; a mounting boss is provided on the piston pad, and the mounting boss extends from the shock absorber tray, and second ribs are evenly distributed on the outside of the mounting boss, and the second ribs are interference fit with the shock absorber tray.

[0010] The outside of the screw sleeve is evenly distributed with first convex ribs, and the first convex ribs are interference fit with the mounting plate; the inside of the piston pad is evenly distributed with first reinforcing ribs, and the outside of the piston pad is evenly distributed with second reinforcing ribs, the piston pad is clearance fit with the outer cylinder of the shock absorber, and the second reinforcing ribs are clearance fit with the inside of the piston.

[0011] The piston pad is a stepped structure, and an installation step is provided at the upper end of the piston pad. The installation step is located between the piston and the outer cylinder of the shock absorber, and the top of the installation step is in contact with the piston sealing ring. The first reinforcing rib and the second reinforcing rib are respectively arranged on the inner and outer sides of the installation step; a clamping step is provided at the bottom end of the piston pad, and the bottom end of the dust cover is clamped with the clamping step.

[0012] A top cover is provided in the middle of the mounting plate, the upper end of the top cover extends from the mounting plate, a retaining spring is provided between the inner side of the mounting plate and the end of the top cover, and a sealing ring is provided at the end of the top cover; a bushing assembly is provided between the top cover and the upper shell body, a piston rod is provided in the outer tube of the shock absorber, the piston rod extends from the outer tube of the shock absorber and extends into the bushing assembly, a nut is connected to the top end of the bushing assembly and the piston rod, a buffer block is sleeved on the piston rod, the buffer block is located in the lower shell body, and the top end of the buffer block is clamped with the upper shell body.

[0013] The bottom end of the lower shell body is provided with a first tooth segment, and the top end of the piston is provided with a second tooth segment. The cross-sections of the first tooth segment and the second tooth segment are both serrated structures. The two ends of the bladder skin are respectively in contact with the first tooth segment and the second tooth segment. The two ends of the bladder skin are respectively provided with a first buckling ring and a second buckling ring, which respectively press the two ends of the bladder skin tightly. The bottom end of the lower shell body is a step structure, and a steel ring is embedded on the inner side of the bottom end of the lower shell body. The upper end of the protective tube is sleeved on the outside of the bladder skin, and the bottom end of the protective tube is clamped with the top of the dust cover.

[0014] An upper shell reinforcement rib is arranged outside the upper shell, a lower shell reinforcement rib is arranged outside the lower shell, a boss is arranged at the end of the upper shell reinforcement rib, and the bottom end of the boss is higher than the upper end of the lower shell reinforcement rib.

[0015] The outside of the upper shell is connected to an air conversion channel, and the air conversion channel is connected to a pressure maintaining valve; a rigidity valve is arranged in the upper top seat, a cushion block is arranged in the upper top seat at one end of the rigidity valve, a retaining ring is arranged on one side of the cushion block, a first sealing ring is arranged between one end of the rigidity valve and the upper top seat, and a second sealing ring is arranged between the other end of the rigidity valve and the upper top seat.

[0016] The piston stopper is made of a material with a low friction coefficient.

[0017] The technical effects of the utility model are as follows: the noise reduction double-chamber air spring structure of the utility model is adopted, and a mounting plate is embedded in the upper shell to improve the structural strength of the upper top seat, and a screw sleeve is provided in the mounting plate. The embedded screw sleeve structure is reasonably designed to meet the bolt installation and achieve anti-rotation effect, improve the thread connection strength and reliability between the upper top seat and the vehicle body, and ensure that the air spring and the vehicle body will not be stripped after multiple disassembly of the thread and the embedded screw sleeve; the connection method between the piston and the shock absorber is changed by the setting of the piston pad, avoiding direct contact between the piston and the shock absorber, avoiding direct contact between metal and metal, solving the problem of torsional abnormal noise of the air spring, and achieving the purpose of reducing noise. The noise reduction double-chamber air spring structure optimizes and improves the installation and assembly of parts and the matching relationship between components, and has the advantages of easy installation, compact structure, reliable structural strength, and easy processing and molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] This specification includes the following drawings, which show the following contents:

[0019] Figure 1 It is a cross-sectional structural diagram of the noise reduction double-chamber air spring structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the upper top seat of the utility model;

[0021] Figure 3It is a cross-sectional structural schematic diagram of the installation of the rigidity valve of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the mounting plate of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the shock absorber of the utility model;

[0024] Figure 6-1 and Figure 6-2 It is a structural schematic diagram of the piston pad of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the screw sleeve of the utility model;

[0026] Figure 8 It is a cross-sectional schematic diagram of the connection position between the upper shell and the lower shell of the utility model. DETAILED DESCRIPTION

[0027] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the utility model and facilitating its implementation.

[0028] like Figure 1 As shown, the noise reduction double-chamber air spring structure includes an upper top seat and a shock absorber, the upper top seat includes an upper shell and a lower shell, the upper shell is arranged at the upper end of the lower shell, and a reinforcement structure is provided on the upper shell; a piston is provided on the outside of the shock absorber, a bladder skin is connected between the bottom end of the lower shell and the top end of the piston, a protective sleeve is provided on the outside of the bladder skin, a dust cover is provided between the bottom end of the protective sleeve and the piston pad, and a piston pad is provided between the bottom of the piston, the shock absorber and the dust cover. The upper shell body is embedded in the lower shell body to form an upper top seat, and the embedded metal parts and the screw sleeve constitute the reinforcement structure of the upper shell body. By designing the limiting boss and the waist-shaped platform of the screw sleeve, the anti-rotation effect of the screw sleeve on the bolt is achieved, the thread strength is improved, and the thread slippage and the screw sleeve falling out are avoided; a piston pad is designed at the connection between the piston and the shock absorber. The piston pad is a plastic part, which improves the connection method between the piston and the shock absorber, and changes the original relative twisting of metal to metal to the relative twisting of metal and plastic, solving the torsion problem of the air spring and achieving the purpose of reducing noise; the bladder skin can be expanded and retracted to adapt to the movement of the piston, and the protective sleeve is used to maintain a part of the shape of the bladder skin and protect it.

[0029] like Figure 1 and 4As shown, the reinforcement structure includes a mounting plate, which is embedded in the upper end of the upper shell, and the upper end of the mounting plate and the upper end of the upper shell are in the same plane. A mounting seat is provided at the end of the mounting plate, and a screw sleeve is embedded in the mounting seat; a waist-shaped platform is provided at the bottom of the screw sleeve, and the waist-shaped platform extends from the bottom of the mounting plate. A limiting boss is provided at the end of the mounting plate, and one side of the limiting boss is arranged parallel to the side of the waist-shaped platform, and a gap is provided between the limiting boss and the waist-shaped platform. The mounting plate is an embedded metal part of the upper shell, and the mounting plate is made of aluminum. After the mounting plate is embedded, it is in the same plane with the upper end of the upper shell, which can improve the strength of the upper seat without increasing the volume of the air spring, and the connection is firm and the structure is compact; the embedded screw sleeve is made of high-strength steel, which can improve the connection strength of the bolt, and a limiting boss extends from the end of the mounting plate, and the plane end of the limiting boss is parallel to the waist-shaped platform of the embedded screw sleeve and the gap is matched. After injection molding, the plastic is filled into the gap, which plays a role in preventing the embedded screw sleeve from rotating, and avoids thread slippage or the embedded screw sleeve from coming out. Since one side of the limiting boss is arranged parallel to the side of the waist-shaped platform, the width of the gap is consistent, which ensures the uniformity of plastic filling and further ensures the reliable strength of the connection between the limiting boss and the waist-shaped platform.

[0030] like Figure 6-1 and Figure 6-2 As shown, the shock absorber includes a shock absorber outer cylinder, a piston pad is sleeved on the shock absorber outer cylinder, and a piston sealing ring is provided between the shock absorber outer cylinder, the bottom end of the piston and the end of the piston pad; a shock absorber tray is fixedly connected to the shock absorber outer cylinder, and the shock absorber tray abuts against the inner side of the piston pad; a mounting boss is provided on the piston pad, and the mounting boss extends from the shock absorber tray, and second convex ribs are evenly distributed on the outside of the mounting boss, and the second convex ribs are interference fit with the shock absorber tray. The setting of the piston pad avoids direct contact between the piston and the shock absorber, thereby achieving the effect of avoiding the torsion of the two to generate noise. The lower end surface of the piston pad abuts against the shock absorber tray, and a groove or through hole is provided on the shock absorber tray. The second convex rib is interference fit with the groove or through hole provided on the shock absorber tray, so as to realize the connection between the piston pad and the shock absorber; the piston is pressed on the piston pad by the high-pressure gas inside the air spring.

[0031] like Figure 7As shown, the first convex ribs are evenly distributed on the outside of the screw sleeve, and the first convex ribs and the mounting plate are interference fit; the first reinforcing ribs are evenly distributed on the inside of the piston pad, and the second reinforcing ribs are evenly distributed on the outside of the piston pad. The piston pad and the outer cylinder of the shock absorber are clearance fit, and the second reinforcing ribs and the inner side of the piston are clearance fit. The setting of the first convex rib improves the connection strength between the screw sleeve and the mounting plate, and further improves the anti-twist effect of the screw sleeve; the inner wall of the piston pad and the outer cylinder of the shock absorber are clearance fit, ensuring that the inner wall of the piston pad will not scratch the outer cylinder of the shock absorber during assembly; the first reinforcing rib and the outer wall of the shock absorber tray adopt interference fit, which improves the fixed strength and installation stability of the piston pad and the shock absorber tray. Considering the process molding and assembly of the shock absorber tray and the piston pad, a transition fit or clearance fit can be adopted. At the same time, the setting of the first reinforcing rib makes the end surface of the piston pad in contact with the shock absorber tray form multiple ventilation grooves. When the air spring assembly is tested for air tightness, if there is air leakage at the piston seal ring, it can be detected in time. The second reinforcing rib and the piston are clearance-fitted, which can reduce the difficulty of assembly and also reduce damage to the piston during the assembly process.

[0032] like Figure 6-1 and Figure 6-2 As shown, the piston pad is a stepped structure, with an installation step provided at the upper end of the piston pad, the installation step is located between the piston and the shock absorber outer cylinder, the top of the installation step contacts the piston sealing ring, the first reinforcing rib and the second reinforcing rib are respectively provided on the inner and outer sides of the installation step; the bottom end of the piston pad is provided with a clamping step, and the bottom end of the dust cover is clamped with the clamping step. The piston pad is designed as a stepped structure, and the piston pad provides a connection position for the connection of the piston, the shock absorber outer cylinder and the dust cover. The structural design is reasonable, and the piston pad is in a stable installation position, which can achieve the effect of preventing torsion and reducing noise.

[0033] like Figure 1 As shown, a top cover is provided in the middle of the mounting plate, the upper end of the top cover extends from the mounting plate, a retaining spring is provided between the inner side of the mounting plate and the end of the top cover, and a sealing ring is provided at the end of the top cover; a bushing assembly is provided between the top cover and the upper shell body, a piston rod is provided in the outer cylinder of the shock absorber, the upper end of the piston rod extends from the outer cylinder of the shock absorber and extends into the bushing assembly, a nut is connected to the bushing assembly and the top end of the piston rod, a buffer block is provided on the piston rod, the buffer block is located in the lower shell body, and the top end of the buffer block is clamped with the upper shell body. The bushing assembly is mounted in the upper seat, the buffer block is fixed with the upper seat, the top cover is pressed onto the bushing assembly, the bushing assembly and the top cover are pressed onto the upper seat by a retaining spring, the inner frame of the bushing assembly is connected to the piston rod of the shock absorber by a nut; the top cover is sealed with the upper seat by a sealing ring, the sealing surface of the upper seat is the inner wall surface of the upper shell, after the mounting plate and the upper shell are injection molded, there is a gap between the upper shell and the mounting plate due to the different shrinkage rates of the materials, so the setting of the sealing ring realizes the sealing of the inner wall surface of the upper shell.

[0034] like Figure 1 As shown, the bottom of the lower shell is provided with a first tooth pattern section, and the top of the piston is provided with a second tooth pattern section. The cross-sections of the first tooth pattern section and the second tooth pattern section are both sawtooth structures. The two ends of the bladder skin are in contact with the first tooth pattern section and the second tooth pattern section respectively. The two ends of the bladder skin are respectively provided with a first buckle ring and a second buckle ring. The first buckle ring and the second buckle ring respectively press the two ends of the bladder skin. The bottom of the lower shell is a step structure, and a steel ring is embedded in the inner side of the bottom of the lower shell. The upper end of the casing is sleeved on the outside of the bladder skin, and the casing fits the bladder skin. The bottom end of the casing is clamped with the top of the dust cover. The connection and sealing of the three are realized by the pressure ring at one end of the bladder skin and the tooth pattern section of the lower shell, and the sealing and fixed connection of the three are realized by the pressure ring at the other end of the bladder skin and the tooth pattern section of the piston. The setting of the tooth pattern section can increase the contact area between the bladder skin and the lower shell and the piston, increase the friction after compression, and improve the sealing and installation stability of the bladder skin. The bladder skin, the support ring, and the casing are fixedly connected through the above structure. The air piston is composed of the support ring, the bladder skin, and the casing from the inside to the outside. A support ring is also provided on the inner side of the bladder skin. The casing, bladder skin and support ring are fixed by buckling. The steel ring increases the strength of the bottom end of the lower shell, which can maintain the shape of the lower shell and prevent it from being deformed due to excessive pressure, further improving the sealing performance. The dust cover has a corrugated structure in cross section and has a certain telescopic function to adapt to the movement of the piston and the aluminum casing. One end of the dust cover is fixed to the casing by a clamp, and the other end is fixed to the piston pad. The clamping can reduce the difficulty of installation and improve production efficiency. A vent is provided at the clamping part of the end of the dust cover.

[0035] like Figure 8 As shown, an upper shell reinforcement rib is provided on the outside of the upper shell, a lower shell reinforcement rib is provided on the outside of the lower shell, a boss is provided at the end of the upper shell reinforcement rib, and the bottom end of the boss is higher than the upper end of the lower shell reinforcement rib. The upper shell and the lower shell are plastic parts, and a hot air welding process is required. Since hot air welding requires heating the plastic parts to the melting temperature required for plastic welding, so that they reach a molten and viscous state, and then a certain pressure is applied to connect them; generally, a melting surface of about 1mm is reserved on the welding surfaces of the upper shell and the lower shell. Since the plastic parts still need to withstand a certain pressure after melting, a circle of reinforcing ribs is set on the outer wall of the upper shell and the lower shell at a distance of 2-4mm from the welding surface. The height and width of the reinforcing ribs are both selected to be greater than or equal to 2mm to prevent the upper shell and the lower shell from being compressed after melting and the side wall from deforming; after the upper shell and the lower shell are welded, there will be overflowing plastic at the weld, and the plastic will be in the middle area of ​​the two reinforcing ribs of the upper and lower shells, affecting the appearance, so a downward boss is also provided on the upper shell reinforcement rib. After welding, the lower surface of the boss shall exceed the upper surface of the lower shell reinforcement rib to wrap the overflowing plastic from the welding to form a seal at the connection between the upper shell and the lower shell, and at the same time achieve an aesthetic effect.

[0036] like Figure 2 and Figure 3As shown, the upper shell is connected to a gas conversion channel on the outside, and the gas conversion channel is connected to a pressure-maintaining valve; a rigidity valve is arranged in the upper top seat, a cushion block is arranged at one end of the rigidity valve in the upper top seat, a retaining ring is arranged on one side of the cushion block, a first sealing ring is arranged between one end of the rigidity valve and the upper top seat, and a second sealing ring is arranged between the other end of the rigidity valve and the upper top seat. The rigidity valve is fixed on the end face of the upper top seat through the cushion block and the retaining ring. A certain gap should be reserved in the axial direction of the rigidity valve to compensate for the dimensional tolerance caused by the injection molding of the upper top seat. The rigidity valve is sealed through the first sealing ring and the second sealing ring to avoid leakage of the gap between the rigidity valve and the upper top seat. A groove is arranged on the side of the lower shell where the rigidity valve is installed, and the lower end of the groove is arranged in the retaining ring groove of the lower shell of the upper top seat to facilitate the disassembly of the rigidity valve. The space between the bladder skin, the upper top seat, the piston, and the shock absorber forms a first chamber, and the space between the upper top seat and the rigidity valve forms a second chamber. The first chamber and the second chamber are connected or disconnected by opening and closing the rigidity valve. Due to the layout of the vehicle space and gas pipelines, the pressure-maintaining valve assembly cannot be directly and securely sealed with the upper top seat. Therefore, a transfer air duct is added and securely sealed with the upper top seat. The transfer air duct is securely connected to the upper top seat by bolts. The transfer air duct is sealed with the upper top seat by a sealing ring. The pressure-maintaining valve assembly is connected to the transfer air duct by threads. The upper top seat opens an air path connected to the first chamber. The air path is connected to the transfer air duct, the pressure-maintaining valve, and the gas pipeline of the vehicle.

[0037] The piston stopper is made of a low friction coefficient material. The piston pad is made of a material with high strength and low friction coefficient, and the piston pad can also be provided with a layer of low friction coefficient material on the plane in contact with the piston, which has the effect of reducing the friction between the piston and the piston stopper.

[0038] The double-chamber air spring structure includes an upper seat assembly, a piston, a shock absorber, a piston seal, and a piston pad; the piston, the piston seal, and the piston pad are all mounted on the shock absorber, and the assembly sequence is to first mount the piston pad on the shock absorber, then mount the piston seal on the shock absorber and abut against the upper end surface of the piston pad, and then mount the piston on the shock absorber and abut against the piston pad. A connecting plate is also provided on the outside of the shock absorber, and a connecting hole is provided on the connecting plate to provide an installation position for the installation of the shock absorber.

[0039] The noise-reducing dual-chamber air spring structure has a mounting plate embedded in the upper shell to improve the structural strength of the upper seat, and a threaded sleeve is provided in the mounting plate. The embedded threaded sleeve has a reasonable structural design, which can meet the bolt installation and achieve anti-rotation effect, improve the thread connection strength and reliability between the upper seat and the vehicle body, and ensure that the air spring and the vehicle body will not be stripped or the embedded threaded sleeve will not fall out after multiple disassembly. The piston pad is also set to change the connection method between the piston and the shock absorber, avoiding direct contact between the piston and the shock absorber, avoiding direct contact between metal and metal, solving the problem of torsional abnormal noise of the air spring, and achieving the purpose of reducing noise. The noise-reducing dual-chamber air spring structure optimizes and improves the installation and assembly of parts and the matching relationship between components, and has the advantages of easy installation, compact structure, reliable structural strength, and easy processing and molding.

[0040] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A noise reduction dual-chamber air spring structure, characterized in that: It includes an upper seat and a shock absorber, the upper seat includes an upper shell and a lower shell, the upper shell is arranged on the upper end of the lower shell, and a reinforcement structure is arranged on the upper shell; a piston is arranged outside the shock absorber, a bladder skin is connected between the bottom end of the lower shell and the top end of the piston, a protective sleeve is arranged outside the bladder skin, a dust cover is arranged between the bottom end of the protective sleeve and the piston pad, and a piston pad is arranged between the bottom of the piston, the shock absorber and the dust cover.

2. The noise reduction dual-chamber air spring structure according to claim 1, characterized in that: The reinforcement structure includes a mounting plate, which is embedded in the upper end of the upper shell body. The upper end of the mounting plate and the upper end of the upper shell body are in the same plane. A mounting seat is provided at the end of the mounting plate, and a screw sleeve is embedded in the mounting seat. A waist-shaped platform is provided at the bottom of the screw sleeve, and the waist-shaped platform extends from the bottom of the mounting plate. A limiting boss is provided at the end of the mounting plate, and one side of the limiting boss is arranged parallel to the side of the waist-shaped platform. A gap is provided between the limiting boss and the waist-shaped platform.

3. The noise reduction dual-chamber air spring structure according to claim 2, characterized in that: The shock absorber includes a shock absorber outer cylinder, the piston pad is sleeved on the shock absorber outer cylinder, and a piston sealing ring is provided between the shock absorber outer cylinder, the bottom end of the piston and the end of the piston pad; a shock absorber tray is fixedly connected to the shock absorber outer cylinder, and the shock absorber tray abuts against the inner side of the piston pad; a mounting boss is provided on the piston pad, and the mounting boss extends from the shock absorber tray, and second ribs are evenly distributed on the outside of the mounting boss, and the second ribs are interference fit with the shock absorber tray.

4. The noise reduction dual-chamber air spring structure according to claim 3, characterized in that: The outside of the screw sleeve is evenly distributed with first convex ribs, and the first convex ribs are interference fit with the mounting plate; the inside of the piston pad is evenly distributed with first reinforcing ribs, and the outside of the piston pad is evenly distributed with second reinforcing ribs, the piston pad is clearance fit with the outer cylinder of the shock absorber, and the second reinforcing ribs are clearance fit with the inside of the piston.

5. The noise reduction dual-chamber air spring structure according to claim 4, characterized in that: The piston pad is a stepped structure, and an installation step is provided at the upper end of the piston pad. The installation step is located between the piston and the outer cylinder of the shock absorber, and the top of the installation step is in contact with the piston sealing ring. The first reinforcing rib and the second reinforcing rib are respectively arranged on the inner and outer sides of the installation step; a clamping step is provided at the bottom end of the piston pad, and the bottom end of the dust cover is clamped with the clamping step.

6. The noise reduction dual-chamber air spring structure according to claim 3, characterized in that: A top cover is provided in the middle of the mounting plate, the upper end of the top cover extends from the mounting plate, a retaining spring is provided between the inner side of the mounting plate and the end of the top cover, and a sealing ring is provided at the end of the top cover; a bushing assembly is provided between the top cover and the upper shell body, a piston rod is provided in the outer tube of the shock absorber, the piston rod extends from the outer tube of the shock absorber and extends into the bushing assembly, a nut is connected to the top end of the bushing assembly and the piston rod, a buffer block is sleeved on the piston rod, the buffer block is located in the lower shell body, and the top end of the buffer block is clamped with the upper shell body.

7. The noise reduction dual-chamber air spring structure according to claim 1, characterized in that: The bottom end of the lower shell body is provided with a first tooth segment, and the top end of the piston is provided with a second tooth segment. The cross-sections of the first tooth segment and the second tooth segment are both serrated structures. The two ends of the bladder skin are respectively in contact with the first tooth segment and the second tooth segment. The two ends of the bladder skin are respectively provided with a first buckling ring and a second buckling ring, which respectively press the two ends of the bladder skin tightly. The bottom end of the lower shell body is a step structure, and a steel ring is embedded on the inner side of the bottom end of the lower shell body. The upper end of the protective tube is sleeved on the outside of the bladder skin, and the bottom end of the protective tube is clamped with the top of the dust cover.

8. The noise reduction dual-chamber air spring structure according to any one of claims 1 to 7, characterized in that: An upper shell reinforcement rib is arranged outside the upper shell, a lower shell reinforcement rib is arranged outside the lower shell, a boss is arranged at the end of the upper shell reinforcement rib, and the bottom end of the boss is higher than the upper end of the lower shell reinforcement rib.

9. The noise reduction dual-chamber air spring structure according to claim 8, characterized in that: The outside of the upper shell is connected to an air conversion channel, and the air conversion channel is connected to a pressure maintaining valve; a rigidity valve is arranged in the upper top seat, a cushion block is arranged in the upper top seat at one end of the rigidity valve, a retaining ring is arranged on one side of the cushion block, a first sealing ring is arranged between one end of the rigidity valve and the upper top seat, and a second sealing ring is arranged between the other end of the rigidity valve and the upper top seat.

10. The noise reduction dual-chamber air spring structure according to claim 4, characterized in that: The piston stopper is made of a material with a low friction coefficient.

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