Gas damping independent air spring

Abstract

The utility model belongs to the technical field of automobile suspensions, and particularly relates to a gas damping independent air spring which comprises a base, an air bag, a piston and a protective cylinder. The open end of the piston is connected with the upper end of the air bag; the main air chamber is located on the side, close to the air bag, of the partition plate, and the auxiliary air chamber is located in a piston cavity. A compression throttling hole and a stretching throttling hole which are communicated with the main air chamber and the auxiliary air chamber are formed in the partition plate; a first elastic valve plate for sealing the compression throttling hole is arranged in the auxiliary air chamber, and a second elastic valve plate for sealing the stretching throttling hole is arranged in the main air chamber. The pressure difference between the main air chamber and the auxiliary air chamber is used for controlling opening and closing of the compression throttling hole and the stretching throttling hole, so that effective air containing cavities of the air spring are rapidly switched, and the rigidity of the air spring is adjusted in time. The air flow is limited through the compression throttling hole and the stretching throttling hole, and damping force is provided for the telescopic movement of the air spring.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile suspension, and in particular relates to a gas damping independent air spring. Background Art

[0002] Independent air springs are assembled separately from the shock absorber and are suitable for high-end sedans, SUVs, and other vehicles. They provide excellent cushioning against bumpy roads. Existing independent air springs primarily consist of a base, an airbag, and a piston. The lower end of the airbag is sealed to the base, while the upper end of the airbag is sealed to the lower end of the piston. The base, airbag, and piston form a sealed air chamber. The base is connected to the wheel frame, and the piston is connected to the suspension.

[0003] The stiffness characteristics of independent air springs significantly impact a vehicle's comfort and handling stability. The stiffness of an air spring is primarily determined by the volume of the air chamber and the shape of the piston's outer surface. Because the piston's shape has a limited range of adjustment for the air spring's stiffness, some vehicles have two air chambers in their air springs. A solenoid valve controls the opening and closing of the pipe connecting the two chambers, thereby changing the volume of the air spring's effective chamber and, consequently, its stiffness curve. The solenoid valve is controlled by the onboard computer. This process, from receiving a sensing signal from the computer, sending a signal to the solenoid valve, and then executing the action after the solenoid valve receives the signal, requires a time interval, resulting in a lag in the adjustment of the air spring's stiffness. Although independent air springs offer excellent cushioning, the damping during vehicle suspension movement is primarily provided by the shock absorber, which places higher demands on the shock absorber's cushioning performance. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a gas-damped independent air spring, which can quickly and timely switch the effective gas volume of the air spring, adjust the stiffness curve of the air spring, and at the same time provide air damping for the suspension system and the vehicle body, share the impact force of the shock absorber, and extend the service life of the shock absorber.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a gas damping independent air spring, comprising a base, an airbag, a piston and a protective cylinder sleeved on the piston, wherein the lower end of the airbag is fastened to the base;

[0006] The piston is a cylindrical structure with one end open, the open end of the piston is tightly connected to the upper end of the airbag, and the cavity of the piston is in communication with the cavity of the airbag. The base, the airbag and the piston form a closed gas chamber. A partition is provided on the piston to separate the gas chamber into a main air chamber and an auxiliary air chamber. The main air chamber is located on a side of the partition close to the airbag, and the auxiliary air chamber is located on a side of the partition away from the airbag and is located in the cavity of the piston.

[0007] The partition is provided with a compression throttle hole and a tension throttle hole connecting the main air chamber and the auxiliary air chamber; the auxiliary air chamber is provided with a first elastic valve plate, which is pressed and fitted on the partition to close the compression throttle hole; the main air chamber is provided with a second elastic valve plate, which is pressed and fitted on the partition to close the tension throttle hole.

[0008] Furthermore, a positioning hole is provided at the open end of the piston, the diameter of the positioning hole is larger than the inner diameter of the piston and the two form an annular step;

[0009] The partition is arranged in the positioning hole and fits tightly with the annular step, and the outer side surface of the partition is sealed and connected to the hole wall of the positioning hole.

[0010] Furthermore, the end surface of the partition close to the airbag is flush with the end surface of the open end of the piston, and the partition is sealed and welded to the piston.

[0011] Furthermore, the first elastic valve disc and the second elastic valve disc each include a compressible elastic member and a baffle connected to each other;

[0012] The baffle of the first elastic valve piece is pressed against the partition to close the compression throttle hole; the baffle of the second elastic valve piece is pressed against the partition to close the tension throttle hole.

[0013] Furthermore, the first elastic valve piece and the second elastic valve piece have the same structure.

[0014] Furthermore, a first pressure plate and a second pressure plate are provided on the partition, the first pressure plate is provided in the auxiliary air chamber, and the second pressure plate is provided in the main air chamber; a first accommodation space is defined between the first pressure plate and the partition, and a second accommodation space is defined between the second pressure plate and the partition;

[0015] The first elastic valve disc is located in the first accommodating space and the compression elastic member is connected to the first pressing plate. The second elastic valve disc is located in the second accommodating space and the compression elastic member is connected to the second pressing plate.

[0016] Furthermore, a first adjusting screw and a second adjusting screw are threadedly mounted on the partition, and both the first adjusting screw and the second adjusting screw vertically pass through the partition; the first pressure plate is fixedly mounted on the end of the first adjusting screw, and the second pressure plate is mounted on the end of the second adjusting screw.

[0017] Furthermore, the first pressing plate is a ring plate structure coaxially mounted on the first adjusting screw, and the second pressing plate is a ring plate structure coaxially mounted on the second adjusting screw;

[0018] The baffle on the first elastic valve plate is an annular structure coaxially arranged with the first adjusting screw; the baffle on the second elastic valve plate is an annular structure coaxially arranged with the second adjusting screw.

[0019] Furthermore, the compression throttling hole is an annular through hole provided on the outside of the first adjusting screw and arranged coaxially therewith, and the tension throttling hole is an annular through hole provided on the outside of the second adjusting screw and arranged coaxially therewith.

[0020] Furthermore, the first adjusting screw is provided with a washer and a fastening nut at one end located in the main air chamber, and the second adjusting screw is provided with a washer and a fastening nut at one end located in the auxiliary air chamber.

[0021] Compared with the prior art, the beneficial effects of the present invention are: providing a gas-damped independent air spring, utilizing the volume change of the main air chamber of the air spring to bring about the change of the internal gas pressure thereof so that there is a pressure difference between it and the auxiliary air chamber, utilizing the pressure difference between the main air chamber and the auxiliary air chamber to change the distance between the first elastic valve plate and the second elastic valve plate relative to the partition, thereby controlling the opening and closing of the compression throttle hole and the tension throttle hole, quickly and timely completing the switching of the connection / isolation state of the main air chamber and the auxiliary air chamber, the rapid switching of the connection path and the gas flow direction, the rapid switching of the volume of the effective gas chamber of the air spring, and timely completing the adaptive adjustment of the stiffness of the air spring; in addition, in the process of gas circulation between the main air chamber and the auxiliary air chamber, the gas flow is limited by the compression throttle hole or the tension throttle hole, providing damping force for the extension and contraction movement of the air spring, so that the air spring not only provides support for the suspension system and the vehicle body, but also provides air damping for the suspension system and the vehicle body, shares the impact force of the shock absorber, and extends the service life of the shock absorber. The vehicle's impact velocity is positively correlated with the air spring's telescopic speed, the opening of the elastic valve disc, and the gas flow rate through the orifice. An increase in the vehicle's impact velocity increases the air spring's telescopic speed, the opening of the elastic valve disc, and the gas flow rate through the orifice, reducing the air spring's damping force and improving its cushioning effect. The elastic valve system's stiffness curve can be adjusted by varying the stiffness and thickness of the elastic valve disc, the size of the compression elastic element, the position of the orifice, and the size of the orifice, thereby varying the air spring's damping force and cushioning performance to meet the needs of different vehicles. Using a first pressure plate to mount the first elastic valve disc and a second pressure plate to mount the second elastic valve disc facilitates assembly. Using an adjusting screw to mount the elastic valve disc allows for adjustable flow cross-sections of the compression and tension orifices, enabling adjustments to the air spring's telescopic damping force and cushioning performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the utility model;

[0023] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0024] Figure 3 Schematic diagram of the assembly structure of the partition plate and the first elastic valve plate;

[0025] Figure 4 Schematic diagram of the assembly structure of the partition plate and the second elastic valve plate;

[0026] Figure markings: 1-base; 2-airbag; 3-piston; 4-protective cylinder; 5-partition; 51-compression throttle hole; 52-tension throttle hole; 53-first elastic valve plate; 531-compression elastic part; 532-baffle; 54-second elastic valve plate; 61-main air chamber; 62-auxiliary air chamber; 71-first pressure plate; 72-second pressure plate; 73-first adjusting screw; 74-second adjusting screw; 75-gasket; 76-fastening nut. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] As attached Figure 1-4 As shown, a gas damping independent air spring comprises a base 1, an airbag 2, a piston 3 and a protective tube 4 sleeved on the piston 3, the lower end of the airbag 2 is fastened to the base 1; the piston 3 is a cylindrical structure with one end open, the open end of the piston 3 is fastened to the upper end of the airbag 2 and the cavity of the piston 3 is connected to the cavity of the airbag 2, the base 1, the airbag 2 and the piston 3 form a closed gas chamber; a partition 5 is provided on the piston 3 to divide the gas chamber into a main air chamber 61 and an auxiliary air chamber 62, the main air chamber 61 is located near the partition 5 On the side close to the airbag 2, the auxiliary air chamber 62 is located on the side of the partition 5 away from the airbag 2 and the auxiliary air chamber 62 is located in the cavity of the piston 3; the partition 5 is provided with a compression throttle hole 51 and a stretch throttle hole 52 connecting the main air chamber 61 and the auxiliary air chamber 62; a first elastic valve sheet 53 is provided in the auxiliary air chamber 62, and the first elastic valve sheet 53 is pressed and fitted on the partition 5 to close the compression throttle hole 51; a second elastic valve sheet 54 is provided in the main air chamber 61, and the second elastic valve sheet 54 is pressed and fitted on the partition 5 to close the stretch throttle hole 52.

[0029] When the vehicle is traveling on a relatively flat road, the air spring's expansion and contraction range is small, and the relative movement range between the base 1 and the piston 3 is within a specified range. At this point, the volume change of the main air chamber 61 is small, and the thrust exerted by the compressed gas in the main air chamber 61 on the first elastic valve disc 53 is less than or equal to the sum of the elastic force of the first elastic valve disc 53 and the pressure exerted on the first elastic valve disc 53 by the gas in the auxiliary air chamber 62. The first elastic valve disc 53 is always tightly fitted against the diaphragm 5, keeping the compression throttle 51 in a normally closed state. The pressure exerted by the gas in the auxiliary air chamber 62 on the second elastic valve disc 54 is less than or equal to the sum of the elastic force of the second elastic valve disc 54 and the pressure exerted on the second elastic valve disc 54 by the gas in the main air chamber 61. The second elastic valve disc 54 is always tightly fitted against the diaphragm 5, keeping the expansion throttle 52 in a normally closed state, and the main air chamber 61 and the auxiliary air chamber 62 are isolated from each other. Since the auxiliary air chamber 62 is located in the cavity of the piston 3 and the piston 3 is a rigid structure, the volume of the auxiliary air chamber 62 remains fixed. During this process, the effective gas volume of the air spring is the main air chamber 61 .

[0030] When the vehicle is traveling on a rough road, the compression amplitude of the air spring exceeds the specified compression amplitude, the base 1 and the piston 3 move toward each other to compress the airbag 2, so that the volume of the main air chamber 61 is reduced and the gas pressure in the main air chamber 61 is increased. The high-pressure gas in the main air chamber 61 presses the second elastic valve plate 54 to make it fit more tightly with the diaphragm 5 to block the stretch throttle hole 52. At the same time, the thrust applied by the high-pressure gas in the main air chamber 61 to the first elastic valve plate 53 is greater than the tension of the first elastic valve plate 53 and the thrust applied by the gas in the auxiliary air chamber 62 to the first elastic valve plate 53. The sum of the pressures of the elastic valve plate 53, the high-pressure gas in the main air chamber 61 pushes open the first elastic valve plate 53 to connect the main air chamber 61 and the auxiliary air chamber 62 through the compression throttle hole 51, and the high-pressure gas in the main air chamber 61 enters the auxiliary air chamber 62 through the compression throttle hole 51. The compression throttle hole 51 limits the flow of gas entering the auxiliary air chamber 62 from the main air chamber 61, providing air damping for the relative movement of the base 1 and the piston 3, improving the supporting force and compression buffering performance of the air spring during compression movement, and making the air spring slowly compress and move. When the air spring is reset or the stretching amplitude of the air spring exceeds the specified stretching amplitude, the base 1 and the piston 3 move away from each other to stretch the airbag 2, and the gas volume of the main air chamber 61 increases and the gas pressure decreases. At this time, the gas pressure in the auxiliary air chamber 62 is greater than the gas pressure in the main air chamber 61. Under the action of the pressure difference, the high-pressure gas in the auxiliary air chamber 62 presses the first elastic valve plate 53 so that it is tightly lifted with the partition 5 and blocks the compression throttle hole 51. At the same time, the thrust applied by the high-pressure gas in the auxiliary air chamber 62 to the second elastic valve plate 54 is greater than the elastic force of the second elastic valve plate 53 and the main air chamber The sum of the thrusts applied by the gas in 61 to the second elastic valve plate 54, the high-pressure gas in the auxiliary air chamber 62 pushes open the second elastic valve plate 54 to connect the main air chamber 61 and the auxiliary air chamber 62 through the stretching throttle hole 52, and the high-pressure gas in the auxiliary air chamber 62 enters the main air chamber 61 through the stretching throttle hole 52. The stretching throttle hole 52 limits the flow of the high-pressure gas entering the main air chamber 61 from the auxiliary air chamber 62, providing air damping for the opposite movement of the base 1 and the piston 3, improving the supporting force and stretching buffering performance of the air spring during rebound movement or stretching movement, and making the air spring stretch slowly.

[0031] It can be seen from this that when the compression movement amplitude of the air spring exceeds the specified amplitude, the main air chamber 61 and the auxiliary air chamber 62 are connected through the compression throttle hole 51; when the rebound reset or stretching movement amplitude of the air spring exceeds the specified amplitude, the main air chamber 61 and the auxiliary air chamber 62 are connected through the stretching throttle hole 51. During this process, the volume change of the main air chamber 61 of the air spring brings about the change of the internal gas pressure thereof, so that there is a pressure difference between it and the auxiliary air chamber 62. The pressure difference between the main air chamber 61 and the auxiliary air chamber 62 is used to change the position of the first elastic valve plate 53 and the second elastic valve plate 54 relative to the partition 5, and to control the opening and closing of the compression throttle hole 51 and the tension throttle hole 52, so as to quickly and timely complete the rapid switching of the connection state, connection path and gas flow direction of the main air chamber 61 and the auxiliary air chamber 62, so that the volume of the effective gas chamber of the air spring is quickly switched, and the adaptive adjustment of the stiffness of the air spring is realized quickly and timely. In addition, in the process of gas flowing between the main air chamber 61 and the auxiliary air chamber 62, the gas flow is limited by the compression throttle hole 51 or the tension throttle hole 52, providing damping force for the extension and contraction movement of the air spring, so that the air spring not only provides support for the suspension system and the vehicle body, but also provides air damping for the suspension system and the vehicle body, shares the impact force of the shock absorber, and extends the service life of the shock absorber.

[0032] The base 1 is used to connect the lower end of the air spring to the wheel frame, and it can be a columnar structure or a tubular structure with one end sealed. The piston 3 is used to connect the upper end of the air spring to the suspension. The sealed end of the piston 3 is generally provided with a mounting seat, through which it is connected to the suspension. The airbag 2 is made of elastic rubber material and can be sealed and crimped on the base 1 and the piston 3 by connectors such as clamps or buckles. The protective tube 4 is mounted on the outside of the airbag 2 to limit the shape of the outer wall of the airbag 2 and protect the airbag 2. When the piston 3 moves axially, the outer wall of the piston 3 and the inner wall of the protective tube 4 cooperate to squeeze the airbag 2 and change the shape and volume of the main air chamber 61 in the airbag 2.

[0033] The partition 5 is used to isolate the main air chamber 61 and the auxiliary air chamber 62. The partition 5 can be set at any position in the piston cavity 3, and can also be set at the open end outside the piston cavity 3. Preferably, a positioning hole is provided at the open end of the piston 3, the aperture of the positioning hole is larger than the inner diameter of the piston 3 and the two form an annular step; the partition 5 is arranged in the positioning hole and fits tightly with the annular step, and the outer side surface of the partition 5 is sealed with the hole wall of the positioning hole. The partition 5 is set at the open end of the piston cavity 3, and the partition 5 is radially positioned by setting the positioning hole to ensure its radial assembly accuracy and facilitate installation; the axial assembly accuracy of the partition 5 is ensured by setting the annular step, thereby ensuring the volume accuracy of the main air chamber 61 and the isolation air chamber 62, reducing the difference in stiffness performance of multiple air springs produced in batches, and improving the assembly quality of the air springs.

[0034] The partition plate 5 and the piston 3 can be sealed together by welding, bonding, or by threads in combination with a sealing structure such as raw tape or a sealing ring. Preferably, the end surface of the partition plate 5 proximal to the airbag 2 is flush with the end surface of the open end of the piston 3. The partition plate 5 and the piston 3 are sealed and welded together. This process is simple, the structure is stable and reliable, and the partition plate 5 is prevented from loosening or falling off due to violent movement of the piston 3, thereby ensuring driving safety.

[0035] The compression throttle hole 51 and the tension throttle hole 52 are used to limit the flow of gas between the main air chamber 61 and the auxiliary air chamber 62 to generate damping, providing a buffer for the expansion and contraction movement of the air spring. The compression throttle hole 51 and the tension throttle hole 52 can be a circular hole, a square hole, a hexagonal hole, an annular hole or the like. The first elastic valve plate 53 is used to control the opening and closing of the compression throttle hole 51, and the second elastic valve plate 54 is used to control the opening and closing of the tension throttle hole 52. The first elastic valve plate 53 and the second elastic valve plate 54 both have a variety of structural forms. They can be an integral structure formed by integrally processing an elastic material, but the material of this structure is generally a flexible material such as silicone and nylon. After multiple compression deformations, it is easy to wear or plastic deformation occurs, affecting the sealing of the damping hole. Preferably, the first elastic valve disc 53 and the second elastic valve disc 54 both include a compression elastic member 531 and a baffle 532 that are interconnected; the baffle 532 of the first elastic valve disc 53 is pressed against the partition 5 to close the compression throttle hole 51; the baffle 532 of the second elastic valve disc 54 is pressed against the partition 5 to close the tension throttle hole 52. The baffle 532 is made of a plate with high rigidity and strength, such as a steel plate or an aluminum plate, and is not easily worn or deformed, thereby improving the reliability of the air spring. The compression elastic member 531 can be a block structure made of elastic rubber such as silicone or nylon, or a coil spring or leaf spring structure. The structures of the first elastic valve disc 53 and the second elastic valve disc 54 can be the same or different. Preferably, the first elastic valve disc 53 and the second elastic valve disc 54 have the same structure, which is convenient for cutting and processing.

[0036] The first elastic valve disc 53 can be mounted on the inner wall of the piston 3 or on the partition 5 via a connector. The second elastic valve disc 54 can be mounted on the base 1, the piston 3, or the partition 5. Specifically, the partition 5 is provided with a first pressure plate 71 and a second pressure plate 72. The first pressure plate 71 is disposed within the auxiliary air chamber 62, and the second pressure plate 72 is disposed within the main air chamber 61. A first accommodation space is defined between the first pressure plate 71 and the partition 5, and a second accommodation space is defined between the second pressure plate 72 and the partition 5. The first elastic valve disc 53 is located within the first accommodation space, and the compression elastic member 531 is connected to the first pressure plate 71. The second elastic valve disc 54 is located within the second accommodation space, and the compression elastic member 531 is connected to the second pressure plate 72. During assembly, the first and second elastic valve discs 34 and 54 are assembled to the partition 5, and finally the partition 5 is assembled to the piston 3. This simple structure facilitates installation and ensures accurate installation. The mounting plate 71 is generally fixed on the partition 5 by a bracket perpendicular to the partition 5. The bracket can be an I-shaped piece, an L-shaped piece or a U-shaped piece. The bracket can be welded or connected to the partition 5 by bolts or other connecting parts.

[0037] When the compression throttle hole 51 is open, the distance between the first elastic valve plate 53 and the first pressure plate 71 affects the flow rate of gas from the main air chamber 61 into the auxiliary air chamber 62, affecting the cushioning capacity of the air spring during compression movement. Similarly, when the extension throttle hole 52 is open, the distance between the second elastic valve plate 54 and the second pressure plate 72 affects the flow rate of gas from the auxiliary air chamber 62 into the main air chamber 61, affecting the cushioning capacity of the air spring during extension movement. As a further preferred embodiment, a first adjusting screw 73 and a second adjusting screw 74 are threadedly mounted on the partition 5, and the first adjusting screw 73 and the second adjusting screw 74 both vertically penetrate the partition 5; the first pressure plate 71 is fixedly mounted on the end of the first adjusting screw 73, and the second pressure plate 72 is mounted on the end of the second adjusting screw 74. By turning the first adjusting screw 73 to adjust the distance between the first pressure plate 71 and the partition 5 and change the initial compression degree when the first elastic valve plate 53 closes the compression throttle hole 51, the pressure applied to the diaphragm 53 by the first elastic valve plate 53 is changed, thereby changing the compression amount of the first elastic valve plate 53 by the high-pressure gas in the main air chamber 61 when the compression throttle hole 51 is opened, the distance between the first elastic valve plate 53 and the partition 5, and the gas flow cross-section of the compression throttle hole 51, thereby realizing the adjustment of the throttling degree of the compression throttle hole 51 and the compression damping force of the air spring. Similarly, by turning the second adjusting screw 74, the distance between the second pressure plate 72 and the diaphragm 5 is adjusted, and the initial compression degree of the second elastic valve disc 54 when closing the stretch throttle hole 52 is changed, the pressure applied by the second elastic valve disc 54 to the diaphragm 5 changes. This, in turn, changes the amount of compression of the first elastic valve disc 53 by the high-pressure gas in the auxiliary air chamber 62 when the stretch throttle hole 52 is opened, the distance between the second elastic valve disc 54 and the diaphragm, and the gas flow cross-section of the stretch throttle hole 52, thereby adjusting the throttling degree of the stretch throttle hole 52 and the tensile damping force of the air spring. In summary, the compression damping force of the air spring can be adjusted by turning the first adjusting screw 73, and the tensile damping force of the air spring can be adjusted by turning the second adjusting screw 74.

[0038] In the above structure, the first pressure plate 71 and the second pressure plate 72 can be a single radial protrusion structure arranged on one side of the adjusting screw, or can be multiple radial protrusion structures evenly distributed along the circumference of the adjusting screw. As a further preferred embodiment, the first pressure plate 71 is a ring plate structure coaxially mounted on the first adjusting screw 73, and the second pressure plate 72 is a ring plate structure coaxially mounted on the second adjusting screw 74; the baffle 532 on the first elastic valve plate 53 is an annular structure coaxially arranged with the first adjusting screw 73; the baffle 532 on the second elastic valve plate 54 is an annular structure coaxially arranged with the second adjusting screw 74. Rotating the first adjusting screw 73 at any angle can ensure that the first pressure plate 71 presses the first elastic valve plate 53 to seal the compression throttle hole 51, and rotating the second adjusting screw 74 at any angle can also ensure that the second pressure plate 72 presses the second elastic valve plate 54 to seal the tension throttle hole 52, which facilitates the assembly and debugging of the air spring.

[0039] When the compression throttle hole 51 is located on one side of the first adjusting screw 73, the first adjusting screw 73 will block the gas from entering and exiting the compression throttle hole 51, affecting the flow direction and flow rate of the gas from the main air chamber 61 to the auxiliary air chamber 62. Similarly, when the tension throttle hole 52 is located on one side of the second adjusting screw 74, the second adjusting screw 74 will block the gas from entering and exiting the tension throttle hole 52, affecting the flow direction and flow rate of the gas from the auxiliary air chamber 62 to the main air chamber 61. As a further preferred embodiment, the compression throttle hole 51 is an annular through hole arranged outside the first adjusting screw 73 and coaxially therewith, and the tension throttle hole 52 is an annular through hole arranged outside the second adjusting screw 74 and coaxially therewith. Gas can enter and exit the periphery of the compression throttle hole 51 and the tension throttle hole 52, reducing the influence of the adjusting screw on the gas flow direction and flow rate, thereby improving the working reliability of the air spring.

[0040] To prevent the first and second adjusting screws 73 and 74 from vibrating and loosening due to repeated telescopic movements of the air spring, a washer 75 and a fastening nut 76 are preferably installed on the end of the first adjusting screw 73 located in the main air chamber 61, and a washer 75 and a fastening nut 76 are installed on the end of the second adjusting screw 74 located in the auxiliary air chamber 62. The fastening nuts 76 and the pressure plate located on both sides of the partition 5 cooperate to axially position the screws on the partition 5, improving the installation security of the first and second adjusting screws 73 and 74 and enhancing the reliability of the air spring.

[0041] The terms "upper," "lower," "top," and "bottom" in this utility model are relative positions and should not be construed as limiting specific positions. The embodiments of this specific implementation are preferred embodiments of the utility model and are not intended to limit the scope of protection of the utility model. Therefore, any equivalent changes based on the structure, shape, and principle of the utility model are intended to be within the scope of protection of the utility model.

Claims

1. A gas damping independent air spring, comprising a base (1), an airbag (2), a piston (3), and a protective tube (4) sleeved on the piston (3), wherein the lower end of the airbag (2) is fastened to the base (1); characterized in that: The piston (3) is a cylindrical structure with one end open, the open end of the piston (3) is tightly connected to the upper end of the airbag (2), and the cavity of the piston (3) is connected to the cavity of the airbag (2), and the base (1), the airbag (2) and the piston (3) form a closed gas chamber; a partition (5) is provided on the piston (3) to separate the gas chamber into a main air chamber (61) and an auxiliary air chamber (62), the main air chamber (61) is located on a side of the partition (5) close to the airbag (2), the auxiliary air chamber (62) is located on a side of the partition (5) away from the airbag (2), and the auxiliary air chamber (62) is located in the cavity of the piston (3); The partition (5) is provided with a compression throttle hole (51) and a stretch throttle hole (52) which are connected to the main air chamber (61) and the auxiliary air chamber (62); a first elastic valve plate (53) is provided in the auxiliary air chamber (62), and the first elastic valve plate (53) is pressed against the partition (5) to close the compression throttle hole (51); a second elastic valve plate (54) is provided in the main air chamber (61), and the second elastic valve plate (54) is pressed against the partition (5) to close the stretch throttle hole (52).

2. The gas damping independent air spring according to claim 1, characterized in that: A positioning hole is provided at the open end of the piston (3), the diameter of the positioning hole is larger than the inner diameter of the piston (3), and the two form an annular step; The partition plate (5) is arranged in the positioning hole and is tightly fitted with the annular step, and the outer side surface of the partition plate (5) is sealed and connected to the hole wall of the positioning hole.

3. The gas damping independent air spring according to claim 2, characterized in that: The end surface of the partition (5) close to the air bag (2) is flush with the end surface of the open end of the piston (3), and the partition (5) and the piston (3) are sealed and welded.

4. The gas damped independent air spring according to any one of claims 1 to 3, characterized in that: The first elastic valve plate (53) and the second elastic valve plate (54) both include a compressible elastic member (531) and a baffle (532) connected to each other; The baffle (532) of the first elastic valve plate (53) is pressed against the partition (5) to close the compression throttle hole (51); the baffle (532) of the second elastic valve plate (54) is pressed against the partition (5) to close the tension throttle hole (52).

5. The gas damping independent air spring according to claim 4, characterized in that: The first elastic valve piece (53) and the second elastic valve piece (54) have the same structure.

6. The gas damped independent air spring according to claim 5, characterized in that: A first pressing plate (71) and a second pressing plate (72) are provided on the partition (5); the first pressing plate (71) is arranged in the auxiliary air chamber (62), and the second pressing plate (72) is arranged in the main air chamber (61); a first accommodating space is provided between the first pressing plate (71) and the partition (5), and a second accommodating space is provided between the second pressing plate (72) and the partition (5); The first elastic valve disc (53) is located in the first accommodating space and the compression elastic member (531) is connected to the first pressure plate (71); the second elastic valve disc (54) is located in the second accommodating space and the compression elastic member (531) is connected to the second pressure plate (72).

7. The gas damped independent air spring according to claim 6, characterized in that: A first adjusting screw (73) and a second adjusting screw (74) are threadedly mounted on the partition (5), and the first adjusting screw (73) and the second adjusting screw (74) both vertically penetrate the partition (5); the first pressing plate (71) is fixedly mounted on the end of the first adjusting screw (73), and the second pressing plate (72) is mounted on the end of the second adjusting screw (74).

8. The gas damped independent air spring according to claim 7, characterized in that: The first pressing plate (71) is a ring plate structure coaxially mounted on the first adjusting screw (73), and the second pressing plate (72) is a ring plate structure coaxially mounted on the second adjusting screw (74); The baffle (532) on the first elastic valve plate (53) is an annular structure coaxially arranged with the first adjusting screw (73); the baffle (532) on the second elastic valve plate (54) is an annular structure coaxially arranged with the second adjusting screw (74).

9. The gas damped independent air spring according to claim 8, characterized in that: The compression throttle hole (51) is an annular through hole arranged outside the first adjusting screw (73) and coaxially arranged therewith, and the tension throttle hole (52) is an annular through hole arranged outside the second adjusting screw (74) and coaxially arranged therewith.

10. The gas damped independent air spring according to claim 7, characterized in that: One end of the first adjusting screw (73) located in the main air chamber (61) is equipped with a washer (75) and a fastening nut (76), and one end of the second adjusting screw (74) located in the auxiliary air chamber (62) is equipped with a washer (75) and a fastening nut (76).

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