Gas damping independent air spring

Abstract

The invention 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 piston is provided with a partition plate dividing the gas containing cavity into a main gas chamber and an auxiliary gas chamber, the main gas chamber is located on the side, close to the gas bag, of the partition plate, and the auxiliary gas chamber is located in the 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 invention 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 refer to air springs that are assembled separately from shock absorbers. They are suitable for high-end cars, off-road vehicles and other models. They can play a good role in buffering when the road is bumpy. Existing independent air springs mainly include a base, an airbag and a piston. The lower end of the airbag is sealed with the base, and the upper end of the airbag is sealed with the lower end of the piston. The base, airbag and piston form a closed 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 have an important impact on the comfort and handling stability of the vehicle. The stiffness of the air spring is mainly determined by the volume of the air chamber and the shape of the outer side of the piston. Since the piston shape has a limited adjustment range for the stiffness of the air spring, the air springs of some vehicles are equipped with two air chambers. The opening and closing of the pipes connecting the two air chambers are controlled by a solenoid valve, thereby changing the volume of the effective air chamber of the air spring and changing the stiffness curve of the air spring. The solenoid valve is controlled by the on-board computer. The process from the on-board computer receiving the sensing signal, to the on-board computer sending the signal to the solenoid valve, to the solenoid valve receiving the signal and executing the action requires a time interval, resulting in a lag in the adjustment of the stiffness of the air spring. Although independent air springs have a good buffering effect, the damping during the movement of the vehicle suspension is mainly provided by the shock absorber, which requires higher buffering performance of the shock absorber. Summary of the invention

[0004] The technical problem to be solved by the present invention 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 present invention 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, the auxiliary air chamber is located on a side of the partition away from the airbag and the auxiliary air chamber is located in the cavity of the piston;

[0007] The partition is provided with a compression throttling hole and a stretching throttling hole connecting the main air chamber and the auxiliary air chamber; the auxiliary air chamber is provided with a first elastic valve sheet, which is pressed and fitted on the partition to close the compression throttling hole; the main air chamber is provided with a second elastic valve sheet, which is pressed and fitted on the partition to close the stretching throttling 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 is tightly fitted 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 plate and the second elastic valve plate each include a compressible elastic member and a baffle connected to each other;

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

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

[0014] Furthermore, the partition is provided with a first pressing plate and a second pressing plate, the first pressing plate is arranged in the auxiliary air chamber, and the second pressing plate is arranged in the main air chamber; a first accommodating space is provided between the first pressing plate and the partition, and a second accommodating space is provided between the second pressing plate and the partition;

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

[0016] Furthermore, the partition is threadedly mounted with a first adjusting screw and a second adjusting screw, and the first adjusting screw and the second adjusting screw both vertically penetrate 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 plate on the first elastic valve plate is an annular structure coaxially arranged with the first adjusting screw; the baffle plate 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 arranged on the outside of the first adjusting screw and coaxially arranged therewith, and the stretching throttling hole is an annular through hole arranged on the outside of the second adjusting screw and coaxially arranged therewith.

[0020] Furthermore, the first adjusting screw is provided with a gasket and a fastening nut at one end located in the main air chamber, and the second adjusting screw is provided with a gasket 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 as to have 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 spacing 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 through the compression throttle hole or the tension throttle hole, providing damping force for the telescopic 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 impact speed of the vehicle is positively correlated with the telescopic movement speed of the air spring, the opening of the elastic valve plate, and the gas flow rate of the throttle hole. The increase in the impact speed of the vehicle will increase the telescopic movement speed of the air spring, the opening of the elastic valve plate, and the gas flow rate of the throttle hole, reduce the damping force of the air spring, and improve the buffering effect of the air spring. The stiffness curve of the elastic valve system can be adjusted by changing the stiffness and thickness of the elastic valve plate, the size of the compression elastic part, the position of the throttle hole, and the size of the throttle hole, thereby changing the damping force and buffering performance of the air spring to meet the use requirements of different vehicles. The first elastic valve plate is installed by the first pressing plate, and the second elastic valve plate is installed by the second pressing plate, which is convenient for assembly; the elastic valve plate is installed by the adjusting screw to make the flow section of the compression throttle hole and the tension throttle hole adjustable, which can realize the adjustment of the telescopic damping force and buffering performance of the air spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the axial cross-sectional structure of the present invention;

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

[0024] Figure 3 is a schematic diagram of the assembly structure of the partition plate and the first elastic valve sheet;

[0025] Figure 4 is a schematic diagram of the assembly structure of the partition plate and the second elastic valve sheet;

[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 member; 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 is further described below in conjunction with 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, wherein 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 communicated with 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 throttling hole 51 and a stretching throttling 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 throttling 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 stretching throttling hole 52.

[0029] When the vehicle is traveling on a relatively flat road, the air spring has a small range of telescopic movement, and the relative movement range of the base 1 and the piston 3 is within the specified range. At this time, the volume change of the main air chamber 61 is small, and the thrust applied by the compressed gas in the main air chamber 61 to the first elastic valve plate 53 is less than or equal to the sum of the elastic force of the first elastic valve plate 53 and the pressure applied by the gas in the auxiliary air chamber 62 to the first elastic valve plate 53. The first elastic valve plate 53 is always tightly fitted with the partition 5 to keep the compression throttle hole 51 in a normally closed state; the pressure applied by the gas in the auxiliary air chamber 62 to the second elastic valve plate 54 is less than or equal to the sum of the elastic force of the second elastic valve plate 54 and the pressure applied by the gas in the main air chamber 61 to the second elastic valve plate 54. The second elastic valve plate 54 is always tightly fitted with the partition 5 to keep the tension throttle hole 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. In 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 decreases and the gas pressure in the main air chamber 61 increases. The high-pressure gas in the main air chamber 61 presses the second elastic valve plate 54 to make it further fit closely with the partition plate 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 to make it tightly lifted with the partition 5 and block 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 movements 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 allowing the air spring to 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. In 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 plate 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, the connection path and the 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 stiffness of the air spring is quickly and timely adapted. 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, so as to provide 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 prolongs 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, which 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, and is connected to the suspension through the mounting seat. The airbag 2 is made of elastic rubber material, which can be sealed and crimped on the base 1 and the piston 3 through connectors such as clamps or buckles. The protective tube 4 is sleeved 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 inside and outside 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 3 cavity, and can also be set at the open end outside the piston 3 cavity. 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 of the partition 5 is sealed and connected to the hole wall of the positioning hole. The partition 5 is arranged 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 air springs.

[0034] The partition 5 and the piston 3 can be sealed and connected by welding, bonding, etc., or by a sealing structure such as a threaded joint with a raw tape, a sealing ring, etc. Preferably, the end surface of the partition 5 close to the airbag 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, which has a simple process and a stable and reliable structure, and can prevent the partition 5 from loosening or falling off when the piston 3 moves violently, thereby ensuring driving safety.

[0035] The compression throttle hole 51 and the stretch 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 telescopic movement of the air spring. The compression throttle hole 51 and the stretch throttle hole 52 can be a circular hole, a square hole, a hexagonal hole, an annular hole and 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 stretch throttle hole 52. The first elastic valve plate 53 and the second elastic valve plate 54 both have a variety of structural forms, which can be an integral structure integrally formed by elastic material, but the material of the structure is generally a flexible material such as silicone and nylon, which is prone to wear or plastic deformation after multiple compression deformations, affecting the sealing of the damping hole. Preferably, the first elastic valve plate 53 and the second elastic valve plate 54 both include a compression 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 plate 5 to close the compression throttling hole 51; the baffle 532 of the second elastic valve plate 54 is pressed against the partition plate 5 to close the tension throttling hole 52, and the baffle 532 is made of a plate with high rigidity and strength such as a steel plate or an aluminum plate, which is not easy to wear and deform, 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 and nylon, or a coil spring or leaf spring structure. The structures of the first elastic valve plate 53 and the second elastic valve plate 54 can be the same or different. Preferably, the first elastic valve plate 53 and the second elastic valve plate 54 have the same structure, which is convenient for cutting and processing.

[0036] The first elastic valve sheet 53 can be installed on the inner wall of the piston 3, or on the partition 5 through a connecting piece; the second elastic valve sheet 54 can be installed on the base 1, the piston 3 or the partition 5. Specifically, the partition 5 is provided with a first pressing plate 71 and a second pressing plate 72, 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; there is a first accommodation space between the first pressing plate 71 and the partition 5, and there is a second accommodation space between the second pressing plate 72 and the partition 5; the first elastic valve sheet 53 is located in the first accommodation space and the compression elastic member 531 is connected to the first pressing plate 71, and the second elastic valve sheet 54 is located in the second accommodation space and the compression elastic member 531 is connected to the second pressing plate 72. During assembly, the first elastic valve sheet 34 and the second elastic valve sheet 54 are assembled to the partition 5, and finally the partition 5 is assembled to the piston 3, which has a simple structure, is convenient for installation, and is easy to ensure installation accuracy. 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, a U-shaped piece or other structures. The bracket can be welded or connected to the partition 5 by bolts or other connecting parts.

[0037] The distance between the first elastic valve plate 53 and the first pressure plate 71 when the compression throttle hole 51 is open affects the flow rate of gas from the main air chamber 61 to the auxiliary air chamber 62, affecting the buffering capacity of the air spring during compression movement; similarly, the distance between the second elastic valve plate 54 and the second pressure plate 72 when the tension throttle hole 52 is open affects the flow rate of gas from the auxiliary air chamber 62 to the main air chamber 61, affecting the buffering capacity of the air spring during tension movement. As a further preference, the partition 5 is threadedly mounted with a first adjusting screw 73 and a second adjusting screw 74, 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 at the end of the first adjusting screw 73, and the second pressure plate 72 is mounted at 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 changing the initial compression degree when the first elastic valve plate 53 closes the compression throttling hole 51, the pressure applied to the partition 5 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 throttling 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 throttling hole 51, thereby realizing the adjustment of the throttling degree of the compression throttling hole 51 and the compression damping force of the air spring. Similarly, by turning the second adjusting screw 74 to adjust the distance between the second pressure plate 72 and the partition 5 and changing the initial compression degree when the second elastic valve plate 54 closes the stretch throttle hole 52, the pressure applied by the second elastic valve plate 54 to the partition 5 changes, thereby changing the compression amount of the first elastic valve plate 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 plate 54 and the partition, and the gas flow cross-section of the stretch throttle hole 52, so as to adjust the throttling degree of the stretch throttle hole 52 and the stretch 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 stretch 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 a plurality of radial protrusion structures evenly distributed along the circumference of the adjusting screw. As a further preference, 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. The first adjusting screw 73 can rotate at any angle to ensure that the first pressure plate 71 presses the first elastic valve plate 53 to seal the compression throttle hole 51, and the second adjusting screw 74 can rotate at any angle to ensure that the second pressure plate 72 presses the second elastic valve plate 54 to seal the tension throttle hole 52, which is convenient for 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 entering and exiting the compression throttle hole 51, affecting the flow direction and flow rate of the gas entering the auxiliary air chamber 62 from the main air chamber 61; similarly, when the stretch throttle hole 52 is located on one side of the second adjusting screw 74, the second adjusting screw 74 will block the gas entering and exiting the stretch throttle hole 52, affecting the flow direction and flow rate of the gas entering the main air chamber 61 from the auxiliary air chamber 62. 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 stretch throttle hole 52 is an annular through hole arranged outside the second adjusting screw 74 and coaxially therewith. Gas can enter and exit from the periphery of the compression throttle hole 51 and the stretch throttle hole 52, reducing the influence of the adjusting screw on the gas flow direction and flow rate, and improving the working reliability of the air spring.

[0040] In order to prevent the first adjusting screw 73 and the second adjusting screw 74 from vibrating and loosening due to multiple telescopic movements of the air spring, preferably, a gasket 75 and a fastening nut 76 are installed at one end of the first adjusting screw 73 located in the main air chamber 61, and a gasket 75 and a fastening nut 76 are installed at one end of the second adjusting screw 74 located in the auxiliary air chamber 62. The fastening nuts 76 and the pressure plate distributed on both sides of the partition 5 cooperate with each other to position the screw axially on the partition 5, thereby improving the installation tightness of the first adjusting screw 73 and the second adjusting screw 74 and improving the reliability of the air spring.

[0041] The terms "upper", "lower", "top" and "bottom" in the present invention are relative positions and cannot be understood as limitations on specific positions. The embodiments of this specific implementation are all preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas damping independent air spring, comprising a base (1), an air bag (2), a piston (3) and a protective tube (4) sleeved on the piston (3), wherein the lower end of the air bag (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). 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 on a side of the partition (5) close to the airbag (2), and the auxiliary air chamber (62) is located on a side of the partition (5) away from the airbag (2). The auxiliary air chamber (62) is located in the cavity of the piston (3). The partition (5) is provided with a compression throttling hole (51) and a stretching throttling 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 throttling 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 stretching throttling 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 fits tightly 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 airbag (2) is flush with the end surface of the opening end of the piston (3), and the partition (5) and the piston (3) are sealed and welded.

4. The gas damping 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 comprise a compressible elastic member (531) and a baffle (532) that are connected to each other; The baffle plate (532) of the first elastic valve plate (53) is pressed against the partition plate (5) to close the compression throttling hole (51); the baffle plate (532) of the second elastic valve plate (54) is pressed against the partition plate (5) to close the tension throttling hole (52).

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

6. The gas damping 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 sheet (53) is located in the first accommodating space and the compression elastic member (531) is connected to the first pressing plate (71), and the second elastic valve sheet (54) is located in the second accommodating space and the compression elastic member (531) is connected to the second pressing plate (72).

7. The gas damping 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 damping 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 plate (532) on the first elastic valve plate (53) is an annular structure arranged coaxially with the first adjusting screw (73); and the baffle plate (532) on the second elastic valve plate (54) is an annular structure arranged coaxially with the second adjusting screw (74).

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

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

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