An air spring

Abstract

The present invention discloses an air spring, comprising a shell, an upper baffle, a floating member, a connecting member, an upper spring, a lower spring, and a lower baffle; the upper baffle is radially arranged in the cavity of the shell so that the cavity is divided into two upper and lower chambers, both ends of the upper baffle are fixedly installed with the inner wall of the shell cavity, and a vent is provided on the plate body of the upper baffle; one end of the connecting member is fixed on the upper baffle and one end thereof extends below the upper baffle, and the other end of the connecting member is fixedly installed with the lower baffle; the floating member is arranged between the upper baffle and the lower baffle and sleeved on the connecting member; one end of the upper spring contacts the upper baffle, and the other end contacts the floating member; one end of the lower spring contacts the lower baffle, and the other end contacts the floating member. The air spring of the present invention changes stiffness according to vibration frequency, which can not only reduce the conduction of chassis noise and enhance the suspension feeling of the vehicle, but also play a good supporting role for the vehicle, and can control the large vibration of the vehicle body under the rolling and pitching conditions.

Description

Technical Field

[0001] The invention belongs to the field of automobiles, and in particular relates to an air spring. Background Art

[0002] The basic principle of existing air springs is to use the fact that the pressure of gas increases when the volume is compressed and decreases when the volume is increased. It is fundamentally based on the ideal gas equation pV=nRT. Due to the compression of the gas, the air spring produces elasticity. This process is accompanied by thermodynamic processes. As the compression speed increases, it is also a transition from isothermal to adiabatic process, resulting in different pressure rise rates of the gas at different compression rates. This is reflected in the external characteristics of the spring, that is, the stiffness of the air spring increases as the movement speed increases.

[0003] From the perspective of vehicle performance, the desired spring stiffness-frequency characteristics are just the opposite. Usually, the spring is expected to be softer at high frequencies and small amplitudes, so that it can better isolate the conduction of high-frequency and small-amplitude vibrations and noise, and improve the vehicle's suspension. The spring is expected to be harder at low frequencies, so that it can provide good support for the vehicle and control the larger vibrations of the vehicle body under roll and pitch conditions. The air spring field does not currently have this characteristic, so the existing technology needs to be improved. Summary of the invention

[0004] In order to solve the above-mentioned problems, the present invention provides an air spring, comprising a shell with an inner cavity, an upper baffle, a floating member, a connecting member, and a lower baffle; the upper baffle is radially arranged in the cavity of the shell so that the cavity is divided into two upper and lower chambers, the outer periphery of the upper baffle is fixedly installed with the inner wall of the shell cavity, and the upper baffle is provided with an air vent; one end of the connecting member is fixed on the upper baffle, and the other end is fixedly installed on the lower baffle, and the connecting member is coaxially arranged with the shell; the floating member is arranged between the upper baffle and the lower baffle and the floating member is sleeved on the connecting member; when airflow passes through the shell, the floating member slides on the connecting member.

[0005] Preferably, the device also includes an upper spring and a lower spring; the upper spring is sleeved on the connecting member and one end contacts the upper baffle plate and the other end contacts the floating member; the lower spring is sleeved on the connecting member and one end contacts the lower baffle plate and the other end contacts the floating member; the upper spring and the lower spring are used for the floating member to slide back and forth on the connecting member.

[0006] Preferably, a plurality of axially arranged annular grooves are provided on the outer peripheral side of the floating member, and the annular grooves and the inner wall of the shell or the inner wall of the upper baffle form a labyrinth sealing structure.

[0007] Preferably, the inner cavity of the shell is provided with a first step, and the lower step surface of the first step is used to abut against the upper plate surface of the upper baffle.

[0008] Preferably, an abutment block is provided on the upper baffle plate for preventing the floating member from continuously floating toward the upper baffle plate, and a gap formed between the inner cavity of the abutment block and the connecting member is used to limit the coaxiality of the upper spring with the connecting member during axial movement.

[0009] Preferably, the abutment block is in the shape of a hollow column, and the connecting piece extends out from the cavity of the abutment block.

[0010] Preferably, the upper baffle and the inner cavity of the shell are fixed through the hole by an elastic retaining ring.

[0011] Preferably, a stepped surface for fixing the upper baffle is provided on the shell.

[0012] Preferably, the connecting part includes a cylindrical pin, a first hexagonal thin nut, and a second hexagonal thin nut. The cylindrical pin is installed on the upper baffle plate in conjunction with the first hexagonal thin nut, and the floating part is sleeved on the pin body of the cylindrical pin; a thread is provided on the end of the cylindrical pin away from the first hexagonal thin nut, and the lower baffle is fixed on the cylindrical pin through a threaded connection with the cylindrical pin by the second hexagonal thin nut.

[0013] Preferably, the second hexagonal thin nut is provided with a mounting groove for installing the lower spring, the lower spring is sleeved on the outer wall of the cylindrical pin, the gap formed by the mounting groove and the cylindrical pin is used to limit the coaxiality of the lower spring and the cylindrical pin, and the installation position of the upper spring is adapted to the installation position of the lower spring.

[0014] Preferably, the floating member is made of plastic, and the floating member is clearance-matched with the cylindrical pin; grooves for reducing weight and reinforcing ribs for increasing strength are provided on the circumference of the floating member.

[0015] Beneficial effects: Figure 2 As shown in FIG. 1 , the spring stiffness of a conventional air spring increases with the increase of the action frequency; however, the air spring of the present invention is different. Figure 3 As shown in Figure 2, the stiffness of the air spring changes with the vibration amplitude, as shown in Figure 2. Figure 5 As shown, the stiffness of the air spring installed with the present invention actually has a frequency change point, that is, under vibrations below this frequency, the air spring shows a higher stiffness K1 to the outside, and under vibrations above this frequency, the air spring shows a lower stiffness K2 to the outside. This air spring that changes stiffness according to the vibration frequency can be softer under high-frequency and small-amplitude conditions, better isolate high-frequency and small-amplitude vibrations and reduce the conduction of chassis noise, thereby improving the vehicle's suspension feel; it can also provide a greater spring stiffness at low frequencies, provide good support for the vehicle, and control larger vibrations of the vehicle body under roll and pitch conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the air spring of the present invention;

[0017] Figure 2 It is a graph showing the change of the stiffness of a common spring with the change of the action frequency;

[0018] Figure 3 A graph showing how the stiffness of the air spring of the present invention changes with the change of the action amplitude;

[0019] Figure 4 It is the density distribution of amplitude and frequency when the vehicle is actually driving on the road;

[0020] Figure 5 A graph showing the change in stiffness of the air spring of the present invention as the operating frequency changes;

[0021] Figure 6 It is a partially enlarged schematic diagram of the fixing method between the upper baffle plate and the inner wall of the shell;

[0022] Figure 7 It is a partial enlarged schematic diagram of another fixing method between the upper baffle plate and the cylindrical pin;

[0023] Figure 8 This is the assembly diagram.

[0024] Description of the drawings: shell 1, upper baffle 2, vent 2-1, abutment block 2-2, floating part 3, connecting part 4, cylindrical pin 4-1, first hexagonal thin nut 4-2, second hexagonal thin nut 4-3, elastic retaining ring 4-2′ for upper hole, elastic retaining ring 4-3′ for lower hole, upper spring 5, lower spring 6, lower baffle 7, elastic retaining ring 8 for hole, assembly outsourcing structure 9, dust cover 9-1, casing 9-2, airbag 9-3, dust cover gasket 9-4, stainless steel single ear hoop 9-5, casing buckling ring 9-6, first stainless steel single ear hoop 9-7, limiting rubber 9-8, push ring 9-9, stainless steel single ear hoop 9-10, upper end cover buckling ring 9-11, second stainless steel single ear hoop 9-12, lower end cover buckling ring 9-13, lower end cover 9-14, detachable piston 9-15. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms first, second, third, etc. are used herein to describe various components or parts, but these components or parts are not limited by these terms. These terms are only used to distinguish one component or part from another component or part. Terms such as "first", "second" and their numerical items do not imply order or sequence when used herein unless clearly indicated by the context. For ease of description, spatial relative terms such as "interior", "exterior", "upper end", "lower end", "left side", "right side", "upper", "left", "right", etc. are used herein to describe the orientation relationship of components or parts in this embodiment, but these spatial relative terms do not limit the orientation of technical features in actual applications.

[0027] like Figures 1 to 5 As shown, an air spring is provided, including a shell 1 with an inner cavity, an upper baffle 2, a floating member 3, a connecting member 4, and a lower baffle 7.

[0028] The upper baffle 2 is axially arranged in the cavity of the shell 1 so that the cavity is divided into two upper and lower chambers. The outer periphery of the upper baffle 2 is fixedly installed with the inner wall of the cavity of the shell 1, and a vent 2-1 is provided on the plate of the upper baffle 2; the floating member 3 is arranged between the upper baffle 2 and the lower baffle 7 and is sleeved on the connecting member 4; the floating member 3 slides back and forth along the axial direction of the connecting member 4, so as to control the stiffness through the vibration frequency; one end of the upper spring 5 contacts the upper baffle 2, and the other end contacts the floating member 3; one end of the lower spring 6 contacts the lower baffle 7, and the other end contacts the floating member 3.

[0029] The specific structure of the air spring is as follows: the shell 1 shown in the figure is one of the embodiments, as long as there is a cavity inside, the upper baffle 2 is axially installed in the cavity of the shell 1, and the partition divides the cavity into two parts, the upper baffle 2 is provided with a vent hole to facilitate gas exchange, the upper baffle 2 spans the inner cavity of the shell 1 and both ends of the upper baffle 2 are fixedly installed with the inner cavity wall. After installation, a connecting member 4 is installed at the center position of the upper baffle 2, that is, the center position of the shell 1, and the connecting member 4 is fixedly installed on the upper baffle 2, wherein a part of the connecting member 4 extends vertically from the bottom of the upper baffle 2, and the lower baffle 7 is installed at the end of the connecting member 4 away from the upper baffle 2, that is, the connecting member 4, the upper baffle 2, and the lower baffle 7 are all fixed parts. Among them, a floating member 3 that can slide on the connecting member 4 is arranged between the lower baffle plate 7 and the upper baffle plate 2. The upper surface of the floating member 3 contacts with the upper spring 5, and the other end of the upper spring 5 contacts the upper baffle plate 2. The lower surface of the floating member 3 contacts with the lower spring 6, and the other end of the lower spring 6 is installed on the lower baffle plate 7. The upper spring 5 and the lower spring 6 are both sleeved on the connecting member 4. When the shell 1 vibrates, the upper spring 5 and the lower spring 6 drive the floating member 3 to slide back and forth on the connecting member 4, and the floating member 3, the connecting member 4 and the shell 1 are designed to be concentric.

[0030] In a preferred embodiment, the outer peripheral side of the floating member 3 is provided with a plurality of axially arranged annular grooves, and the annular grooves and the inner wall of the housing 1 or the inner wall of the upper baffle 2 form a labyrinth seal structure. Figure 1 As shown, the outer surface of the outer ring of the floating member 3 has a plurality of annular groove structures, which form turbulence when the gas flows rapidly, play a sealing role, and isolate the gas flow on both sides of the floating member 3; when the air spring is in a stationary state or jumping at a low speed, the gas flows slowly and does not form turbulence, and the gas in the upper and lower chambers can be exchanged, ensuring that the pressure in the upper and lower chambers is balanced when the static load of the spring changes or when the air is filled or deflated.

[0031] In a preferred embodiment, the floating member 3 may be in the shape of a plate or other suitable structure. In order to ensure that both the connecting member 4 and the floating member 3 maintain better concentricity with the shell 1, the floating member 3 and the connecting member 4 are clearance-fitted, and the upper spring 5 is limited in coaxiality with the connecting member 4 by the annular groove formed by the upper baffle plate 2 and the connecting member 4, and the lower spring 6 is limited in coaxiality with the connecting member 4 by the annular groove formed by the lower baffle plate 7 and the connecting member 4. The upper and lower springs support and push the floating member 3 to perform axial reciprocating motion on the connecting member 4, thereby ensuring the coaxiality of the floating member 3 and the connecting member 4.

[0032] In a preferred embodiment, the inner cavity of the housing 1 is provided with a first step, and the lower step surface of the first step is used to abut the upper surface of the upper baffle 2. The upper baffle 2 is provided with an abutment block 2-2 extending downward, and the abutment block 2-2 is used to prevent the floating member 3 from continuing to operate upward.

[0033] In a preferred embodiment, the abutment block 2-2 is a hollow column, and an upper spring 5 is provided in the gap between the abutment block 2-2 and the connecting member 4. The lower plate surface of the upper baffle plate 2 and the inner cavity of the housing 1 are fixed through a hole with an elastic retaining ring.

[0034] In a preferred embodiment, the connecting member 4 includes a cylindrical pin 4-1, a first hexagonal thin nut 4-2, and a second hexagonal thin nut 4-3. The cylindrical pin 4-1 is installed on the upper baffle 2 in cooperation with the first hexagonal thin nut 4-2, and the floating member 3 is sleeved on the pin body of the cylindrical pin 4-1. The end of the cylindrical pin 4-1 away from the first hexagonal thin nut 4-2 is provided with a thread, and the second hexagonal thin nut 4-3 is threadedly connected to the cylindrical pin 4-1, and the connection method is used to fix the lower baffle 7 on the cylindrical pin 4-1, wherein the lower baffle 7 is fixed to the end of the cylindrical pin 4-1 away from the upper baffle 2. The distance limit of the movement of the two axial ends of the floating member 3 is limited by the second hexagonal thin nut 4-3 and the abutment block 2-2, and the lower baffle 7 is provided with a mounting groove for mounting the lower spring 6, and the lower spring 6 is placed in the mounting groove.

[0035] like Figure 7Another preferred embodiment, in which the two ends of the connecting member 4 may not be the first hexagonal thin nut 4-2 and the second hexagonal thin nut 4-3, and can be fixed with elastic retaining rings through two holes. This fixing method can better ensure coaxiality.

[0036] Specifically: the connecting member 4 includes a cylindrical pin 4-1, an elastic retaining ring 4-2' for the upper hole and an elastic retaining ring 4-3' for the lower hole. ′ It is used to fix the upper baffle 2 and the cylindrical pin 4-1, and the elastic retaining ring 4-3' for the lower hole is used to fix the lower baffle 7 and the cylindrical pin 4-1. The use of the elastic retaining ring 4-2' for the upper hole and the elastic retaining ring 4-3' for the lower hole here improves the coaxiality of the device compared with the threaded nut structure.

[0037] The structure of the upper spring 5 and the lower spring 6 is as follows: a mounting groove for mounting the lower spring 6 is provided on the lower baffle plate 7, and the lower spring 6 is sleeved on the cylindrical pin 4-1; the inner cavity of the abutment block 2-2 and the cylindrical pin 4-1 form a gap for mounting the upper spring 5, and the mounting position of the upper spring 5 and the mounting position of the lower spring 6 are both coaxial with the cylindrical pin 4-1, and are symmetrically placed relative to the floating member 3.

[0038] The working principle of the device is as follows: a stepped structure is arranged in the inner cavity of the shell 1, the upper baffle 2 is fixed by the stepped structure and the elastic retaining ring 8 of the hole, the upper end of the cylindrical pin 4-1 is fixed to the upper baffle 2 by a hexagonal thin nut 4-2, the lower end of the cylindrical pin 4-1 is connected to the lower baffle 7 by a hexagonal thin nut, the floating part 3 is clearance-matched with the cylindrical pin 4-1, the floating part 3 slides on the cylindrical pin 4-1 by the upper spring 5 and the lower spring 6, and the upper spring 5 and the lower spring 6 play a role in resetting the floating part 3.

[0039] like Figure 6 In another preferred embodiment, the upper baffle plate 2 of the structure of the device can be provided with an extended cylinder, and the inner wall of the cylinder and the annular groove of the floating member 3 form a labyrinth sealing structure. The lower end face of the upper baffle plate 2 is fixed by the stepped surface of the shell 1, and the upper end face of the upper baffle plate 2 is fixed by the sleeve, and the upper baffle plate 2 and the shell 1 are clearance-matched.

[0040] The cylindrical pin 4-1 is provided with an external thread for connecting the lower baffle 7 of the lower spring 6. The upper baffle 2 is provided with an air hole, which connects the upper and lower chambers of the upper baffle 2. The radial outer end of the floating member 3 is provided with a plurality of annular grooves, and the annular grooves and the inner cavity of the housing 1 form a labyrinth seal structure. Among them, the labyrinth seal structure is a structural embodiment of the existing sealing method, and the device does not repeat the details of the structure.

[0041] When the air spring moves with high frequency and small amplitude, the gas flows violently, and a pressure difference is generated between the upper and lower chambers of the floating member 3. The pressure difference drives the floating member 3 to vibrate up and down. Although there is no substantial exchange of gas between the upper and lower chambers due to the mechanical seal, the floating member 3 can vibrate up and down with the pressure of the gas, so the pressure difference between the upper and lower chambers is very small. The actual elastic volume of the gas is the sum of the upper and lower chambers, and the spring stiffness is also relatively small.

[0042] The upward and downward movement range of the floating member 3 is limited, and its maximum fluctuating volume is V1. When the suspension amplitude increases and the gas exchange volume between the upper and lower cavities caused by the spring vibration is greater than V1, the floating member 3 will be pushed to the upper limit position or the lower limit position by the gas. The upper limit position is limited by the limit block, and the lower limit position is limited by the lower baffle 7. The floating member 3 is blocked by the upper baffle 2 or the lower baffle 7 and cannot continue to move. Due to the labyrinth sealing structure on the floating member 3, the gas in the upper and lower cavities cannot flow quickly, and the gas in the upper cavity will actually be isolated. The gas volume that actually plays an elastic role is the lower cavity, the volume is reduced, and the stiffness is increased.

[0043] The outer surface of the outer ring of the floating member 3 has multiple annular groove structures. When the gas flows rapidly, turbulence is formed, which plays a sealing role and isolates the gas flow on both sides of the floating member 3; when the air spring is in a stationary state or jumping at a low speed, the gas flows slowly and turbulence will not be formed. The gas in the upper and lower chambers can be exchanged to ensure that the pressure in the upper and lower chambers is balanced when the static load of the spring changes or when it is filled or deflated.

[0044] like Figure 3 As shown, the stiffness of the air spring of the present invention changes with the change of vibration amplitude. Figure 4 It shows that when a vehicle is driving on the road, the amplitude and frequency conform to the road power spectrum density distribution, and the amplitude is inversely proportional to the frequency, that is, as the amplitude increases, the frequency of vibration decreases. Figure 3 and Figure 4 In combination, it can be concluded that the stiffness of the air spring installed with the present invention actually has a frequency change point, that is, under vibrations below this frequency, the air spring shows a higher stiffness k1 to the outside, and under vibrations above this frequency, the air spring shows a lower stiffness k2 to the outside.

[0045] That is to say, it is clear that the air spring of the present invention changes its stiffness according to the vibration frequency, and can be softer at high frequencies and small amplitudes, thereby better isolating high-frequency and small-amplitude vibrations and reducing the conduction of chassis noise, thereby improving the vehicle's suspension feel; it can also provide a greater spring stiffness at low frequencies, thereby providing good support for the vehicle, and can control larger vibrations of the vehicle body under roll and pitch conditions.

[0046] like Figure 8 , Figure 8The overall structure of the device is the assembly outer packaging structure 9 of the present invention, and the upper assembly outer packaging structure 9 includes a dust cover 9-1, a protective tube 9-2, an airbag 9-3, a dust cover gasket 9-4, a stainless steel single-ear hoop 9-5, a protective tube buckle ring 9-6, a limit rubber buckle ring 9-7, a limit rubber 9-8, a push ring 9-9, a stainless steel single-ear hoop 9-10, an upper end cover buckle ring 9-11, a stainless steel single-ear hoop 9-12, a lower end cover buckle ring 9-13, a lower end cover 9-14, and a detachable piston 9-15, wherein the housing 1, the airbag 9-3, and the lower end cover 9-14 form a sealed chamber, and the upper baffle 2 closes the chamber. It is divided into two upper and lower chambers, wherein an upper end cover is provided on the shell 1, and the upper end cover and the airbag 9-3 are sealed by the upper end cover buckling ring 9-11, and the lower end cover 9-14 and the airbag 9-3 are sealed by the lower end cover buckling ring 9-13; wherein, a detachable piston 9-15 is sleeved on the outer periphery of the shell 1, and the detachable piston 9-15 and the upper end cover are in clearance fit, and the detachable piston 9-15 is fixed by the airbag 9-3; a sleeve 9-2 is sleeved on the outer periphery of the airbag 9-3, covering the outer wall of the airbag 9-3, limiting the expanded outer diameter of the airbag 9-3, and preventing the airbag from being damaged by excessive expansion, and the sleeve 9- 2 is fixed to the airbag 9-3 through the casing buckling ring 9-6; the dust cover 9-1 is sleeved on the outer periphery of the casing 9-2, the upper end of the dust cover 9-1 is fixed to the upper end cover by a clamping method, the dust cover liner sleeve 9-4 is set at the buckling position of the casing 9-2 and the airbag 9-3, and the lower end of the dust cover 9-1 is fixed to the dust cover liner 9-4 through a stainless steel single earring hoop 9-12; the gasket ring of the dust cover liner 9-4 is sleeved on the outer periphery of the lower end cover buckling ring 9-13, and is in clearance fit with the lower end cover buckling ring 9-13, the lower end face of the gasket ring of the dust cover liner 9-4 abuts against the lower end cover 9-14, and the gasket ring of the dust cover liner 9-4 The longitudinal section is approximately a right triangle, and its surface is rounded, so that the airbag 9-3 will not rub or squeeze with the metal lower end cover buckling ring 9-13 during operation. The limiting rubber sleeve is arranged on the outer periphery of the lower end cover 9-14, and one end of the limiting rubber 9-8 is fixed to the lower end cover 9-14 by a snap connection. The other end of the limiting rubber 9-8 is fixed to the outer periphery of the protective tube 9-2 by a second stainless steel single earring hoop 9-12. A radial protrusion is arranged at the bottom end of the protective tube 9-2 to better fix the limiting rubber 9-8. The limiting rubber 9-8 protects the exposed part of the airbag 9-3 and plays a role in dust and water prevention.

[0047] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention shall be included in the scope of the technical solutions of the present invention.

Claims

1. An air spring, characterized in that: It comprises a shell (1) with an inner cavity, an upper baffle (2), a floating member (3), a connecting member (4), and a lower baffle (7); The upper baffle plate (2) is radially arranged in the cavity of the shell (1), so that the cavity is divided into two upper and lower chambers, the outer periphery of the upper baffle plate (2) is fixedly mounted to the inner wall of the cavity of the shell (1), and a vent hole (2-1) is provided on the plate body of the upper baffle plate (2); One end of the connecting member (4) is fixed to the upper baffle (2), and the other end is fixedly mounted to the lower baffle (7); the connecting member (4) is coaxially arranged with the housing (1); The floating member (3) is arranged between the upper baffle plate (2) and the lower baffle plate (7), and the floating member (3) is sleeved on the connecting member (4); When air flows through the housing (1), the floating member (3) is subjected to a certain air pressure, and the floating member (3) slides on the connecting member (4); The outer peripheral side of the floating member (3) is provided with a plurality of axially arranged annular grooves, and the annular grooves can form a labyrinth seal structure with the inner wall of the housing (1) or the inner wall of the upper baffle (2); The inner cavity of the shell (1) is provided with a first step, and the lower step surface of the first step is used to abut against the upper plate surface of the upper baffle plate (2).

2. An air spring according to claim 1, characterized in that: It also includes an upper spring (5) and a lower spring (6); The upper spring (5) is sleeved on the connecting member (4) and one end of the upper spring is in contact with the upper baffle (2), and the other end of the upper spring is in contact with the floating member (3); The lower spring (6) is sleeved on the connecting member (4) and has one end in contact with the lower baffle (7) and the other end in contact with the floating member (3); The upper spring (5) and the lower spring (6) are used for the floating member (3) to slide back and forth on the connecting member (4).

3. An air spring according to claim 2, characterized in that: An abutment block (2-2) is provided on the body of the upper baffle plate (2) for preventing the floating member (3) from continuously floating in the direction of the upper baffle plate (2); a gap formed between the inner cavity of the abutment block (2-2) and the connecting member (4) is used to limit the coaxiality of the upper spring (5) with the connecting member (4) during axial movement.

4. An air spring according to claim 3, characterized in that: The abutment block (2-2) is in the shape of a hollow column, and the connection piece (4) extends out from the cavity of the abutment block (2-2).

5. The air spring according to claim 1, characterized in that: The upper baffle (2) and the inner cavity of the shell (1) are fixed through a hole using an elastic retaining ring.

6. The air spring according to claim 1, characterized in that: The shell (1) is provided with a stepped surface for fixing the upper baffle (2).

7. An air spring according to claim 2, characterized in that: The connecting member (4) comprises a cylindrical pin (4-1), a first hexagonal thin nut (4-2), and a second hexagonal thin nut (4-3); the cylindrical pin (4-1) is mounted on the upper baffle (2) in cooperation with the first hexagonal thin nut (4-2); and the floating member (3) is sleeved on the pin body of the cylindrical pin (4-1); The cylindrical pin (4-1) is provided with a thread at one end away from the first hexagonal thin nut (4-2), and the lower baffle (7) is threadedly connected to the cylindrical pin (4-1) via the second hexagonal thin nut (4-3) and fixed on the cylindrical pin (4-1).

8. An air spring according to claim 7, characterized in that: The second hexagonal thin nut (4-3) is provided with a mounting groove for mounting the lower spring (6); the lower spring (6) is sleeved on the outer wall of the cylindrical pin (4-1); the gap formed by the mounting groove and the cylindrical pin (4-1) is used to limit the coaxiality of the lower spring (6) and the cylindrical pin (4-1); the mounting position of the upper spring (5) is adapted to the mounting position of the lower spring (6); The floating member (3) is made of plastic, and the floating member (3) and the cylindrical pin (4-1) are clearance-matched; The end surface of the floating member (3) is provided with a groove for reducing weight and a reinforcing rib for increasing strength.

Images