Air spring piston and air spring

Abstract

The application relates to the field of air springs, in particular to an air spring piston and an air spring. The air spring piston comprises a first mounting base, a second mounting base, a third mounting base and an electromagnetic valve. The first mounting base is connected with a vehicle body. The first mounting base is integrally connected or welded with the second mounting base on one side, and is in airtight connection with one end of a valve body of the electromagnetic valve through the second mounting base. The first mounting base is integrally connected or welded with the third mounting base on the other side, and is in airtight connection with the other end of the valve body of the electromagnetic valve through the third mounting base. The three mounting bases and the valve body of the electromagnetic valve surround to form a secondary chamber. The secondary chamber is communicated with an air bag of the air spring through the electromagnetic valve, so that the air spring has a double-cavity structure, the air spring piston has higher structural strength, and the secondary chamber has good airtightness.

Description

Technical Field

[0001] This application relates to the field of air springs, and more particularly to an air spring piston and an air spring. Background Technology

[0002] Currently, air springs are mainly single-chamber structures. In order to enable air springs to have a larger stiffness adjustment range and provide both good handling and good comfort under different driving conditions, multi-chamber air spring structures provide a feasible solution by adjusting the volume of the working chamber to change the size and stiffness.

[0003] However, because multi-cavity structures require good airtightness, multi-cavity air spring structures generally have problems such as many parts, inconvenient installation, and large space occupation. Summary of the Invention

[0004] The purpose of this invention is to provide an air spring piston and an air spring, so that the secondary chamber inside the air spring piston has good airtightness, while simplifying the structure and installation of the air spring piston.

[0005] This invention provides an air spring piston, comprising a first mounting seat, a second mounting seat, a third mounting seat, and a solenoid valve. The first mounting seat is for mounting on the body of a motor vehicle. One end of the solenoid valve is connected to the first mounting seat via the second mounting seat, and the other end of the solenoid valve is connected to the first mounting seat via the third mounting seat, forming a secondary chamber through the first mounting seat, the second mounting seat, the third mounting seat, and the valve body of the solenoid valve. The second mounting seat is for airtight connection with the air bladder of the air spring, and the secondary chamber communicates with the main chamber within the air bladder via the solenoid valve. The first mounting seat and the second mounting seat are integrally formed or welded together; and / or, the first mounting seat and the third mounting seat are integrally formed or welded together.

[0006] Furthermore, the second mounting base includes a second cylindrical body; one end of the second cylindrical body is integrally formed on the first mounting base; or, the first mounting base is integrally formed with a first cylindrical body, the first cylindrical body and the second cylindrical body being adapted to each other so that the first cylindrical body and the second cylindrical body can be welded together with their end faces facing each other.

[0007] Furthermore, when the second cylinder is welded to the first mounting base, a bevel is made at the welded section of the first cylinder and the second cylinder.

[0008] Furthermore, the second mounting base also includes a base, the second cylindrical body is arranged around the periphery of the base, and the second cylindrical body and the base are integrally formed; the base has a connecting hole, the connecting hole is connected to the airbag; a limiting cylinder is formed on the side of the base facing the interior of the sub-chamber, the limiting cylinder is arranged around the outside of the connecting hole; one end of the valve body is inserted into the limiting cylinder and mounted on the base, the first vent of the valve body is opposite to and connected to the connecting hole, and the second vent of the valve body is connected to the sub-chamber; a first sealing element is provided between the valve body and the limiting cylinder, and the valve body is sealed against the limiting cylinder through the first sealing element.

[0009] Furthermore, the air spring piston also includes a piston profile, on the inner sidewall of which a plurality of positioning ribs are formed at intervals along the circumference of the piston profile; for the welded first cylinder and the second cylinder, the piston profile is sleeved on the outside of the first cylinder and the second cylinder, and the positioning ribs are engaged with the first cylinder and the positioning ribs are clearance-fitted with the second cylinder.

[0010] Furthermore, a stepped clearance notch is formed on the inner side of the end of the positioning rib facing the first mounting base, so that the positioning rib forms a clearance space at the weld between the first cylinder and the second cylinder to avoid the extrusion at the weld.

[0011] Furthermore, the clearance notch has a first sidewall, which is opposite to and spaced a predetermined distance from the first cylinder, and has a snap-fit ​​groove. The outer sidewall of the first cylinder has a snap-fit ​​protrusion along its circumference, and the snap-fit ​​protrusion has an installation slope. When the piston cross-section moves axially along the first cylinder to be fitted onto the first cylinder, the snap-fit ​​protrusion can deform with the help of the installation slope to extend into the snap-fit ​​groove, so that the snap-fit ​​protrusion snaps into the snap-fit ​​groove.

[0012] Furthermore, one end of the third mounting base is arranged around the outer side of the valve body at the end away from the second mounting base; a second sealing element is provided between the third mounting base and the valve body, and the valve body is sealed against the third mounting base through the second sealing element; the end of the third mounting base away from the solenoid valve is integrally formed on the first mounting base; or, the first mounting base forms an annular support portion, and the end of the third mounting base away from the solenoid valve forms an annular connecting portion, the connecting portion being mounted and welded to the support portion.

[0013] Furthermore, the first mounting base has a first air passage, and the second mounting base has a second air passage; one end of the second air passage is connected to the first air passage, and the other end of the second air passage is connected to the main chamber or the auxiliary chamber.

[0014] Furthermore, the first mounting base, the second mounting base, the third mounting base, and the piston cross-section are made of glass fiber reinforced polyamide plastic.

[0015] The present invention also provides an air spring, comprising the air spring piston described in any of the preceding claims.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The air spring piston provided by this invention includes a first mounting seat, a second mounting seat, a third mounting seat, and a solenoid valve. The first mounting seat is connected to the vehicle body. A second mounting seat is integrally formed or welded to one side of the first mounting seat, and the first mounting seat is airtightly connected to one end of the valve body of the solenoid valve via the second mounting seat. A third mounting seat is integrally formed or welded to the other side of the first mounting seat, and the first mounting seat is airtightly connected to the other end of the valve body of the solenoid valve via the third mounting seat. The first mounting seat, the second mounting seat, the third mounting seat, and the valve body of the solenoid valve enclose a secondary chamber with a predetermined volume. The secondary chamber is connected to the air spring's air bladder via the solenoid valve and its opening and closing are controlled by the solenoid valve. This gives the air spring a dual-chamber structure, allowing for a wider stiffness adjustment range, improving the vehicle's handling stability and ride comfort. Simultaneously, it provides the air spring piston with higher structural strength and ensures good airtightness of the secondary chamber.

[0018] The present invention also provides an air spring, including the aforementioned air spring piston, thus the air spring also has the beneficial effects of an air spring piston. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an air spring with a dual-cavity structure provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of an air spring piston provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the welding structure between the first cylinder and the second cylinder provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a bevel shape for the weld between the first cylinder and the second cylinder provided in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of another bevel shape for the weld between the first cylinder and the second cylinder provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the welding structure between the support portion and the connecting portion provided in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the connection between the piston cross-section and the first cylinder provided in an embodiment of the present invention.

[0027] Figure label:

[0028] 10-First mounting seat, 100-Support part, 101-First cylinder body, 102-Snap-fit ​​protrusion, 11-Third mounting seat, 110-Connecting part, 12-Second mounting seat, 120-Second cylinder body, 121-Limiting cylinder, 13-Piston profile, 130-Avoidance notch, 14-Solenoid valve, 15-Extruded material, 2-Airbag. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The following reference Figures 1 to 7 This application describes an air spring piston and an air spring according to some embodiments thereof.

[0035] This application provides an air spring piston, such as Figure 1 As shown, it is used to make an airtight connection with one end of the air spring airbag 2 and to connect with the vehicle body.

[0036] like Figure 1 and Figure 2 As shown, the air spring piston includes a first mounting seat 10, a second mounting seat 12, a third mounting seat 11, and a solenoid valve 14. The first mounting seat 10 is used to connect to the body of a motor vehicle. The second mounting seat 12 is connected to one side of the first mounting seat 10, and the first mounting seat 10 is airtightly connected to one end of the valve body of the solenoid valve 14 through the second mounting seat 12. The third mounting seat 11 is connected to the other side of the first mounting seat 10, and the first mounting seat 10 is airtightly connected to the other end of the valve body of the solenoid valve 14 through the third mounting seat 11. The first mounting seat 10, the second mounting seat 12, the third mounting seat 11, and the valve body of the solenoid valve 14 enclose a secondary chamber with a predetermined volume, and the two vents of the solenoid valve 14 face the interior and exterior of the secondary chamber, respectively.

[0037] The air spring piston is airtightly connected to one end of the airbag 2 via the third mounting seat 11. One vent of the solenoid valve 14 facing the outside of the auxiliary chamber faces the inside of the airbag 2 to communicate with the main chamber inside the airbag 2. This allows the main chamber inside the airbag 2 to communicate with the auxiliary chamber and controls its opening and closing via the solenoid valve 14. Therefore, the air spring has a dual-chamber structure, which gives the air spring a larger stiffness adjustment range to improve the handling stability and ride comfort of the vehicle.

[0038] The connection between the first mounting base 10 and the second mounting base 12 is integrally formed or welded; and / or, the connection between the first mounting base 10 and the third mounting base 11 is integrally formed or welded.

[0039] For example, such as Figure 2 As shown, the second mounting base 12 and the third mounting base 11 are welded to the first mounting base 10, so that the first mounting base 10, the second mounting base 12 and the third mounting base 11 are stably and firmly connected as one unit, thereby giving the air spring piston higher structural strength and ensuring that the secondary chamber has good airtightness.

[0040] For example, the first mounting base 10 and the second mounting base 12 can be integrally machined, and then the first mounting base 10 and the third mounting base 11 can be welded together; or, the first mounting base 10 and the third mounting base 11 can be integrally machined, and then the first mounting base 10 and the second mounting base 12 can be welded together; thus, while ensuring that the air spring piston has high structural strength and good airtightness, one welding step can be reduced, making the processing and assembly of the air spring piston simpler.

[0041] For example, the first mounting base 10, the second mounting base 12, and the third mounting base 11 are formed as a single piece.

[0042] In one embodiment of this application, preferably, the first mounting base 10, the second mounting base 12, and the third mounting base 11 are all made of plastic; for example, the first mounting base 10, the second mounting base 12, and the third mounting base 11 are all made of glass fiber reinforced PA (polyamide), which can reduce equipment costs and make the air spring lighter while ensuring structural strength.

[0043] In one embodiment of this application, preferably, as shown below, Figure 2 As shown, the second mounting base 12 includes a base and a second cylindrical body 120. The second cylindrical body 120 surrounds the periphery of the base, and one end of the second cylindrical body 120 is vertically connected to the base. Preferably, the base and the second cylindrical body 120 are integrally formed.

[0044] When the first mounting base 10 and the second mounting base 12 are integrally formed, the lower surface of the first mounting base 10 faces the second mounting base 12, and the upper end of the second cylinder 120, which is away from the base, is integrally formed on the lower surface of the first mounting base 10.

[0045] Combination Figure 2 and Figure 3 As shown, when the first mounting base 10 and the second mounting base 12 are welded together, the upper end of the second cylinder 120 can be directly welded to the lower surface of the first mounting base 10; or, the first cylinder 101 is integrally formed on the lower surface of the first mounting base 10, and the first cylinder 101 is adapted to the second cylinder 120 so that the upper end face of the second cylinder 120 can be opposite to and welded to the lower end face of the first cylinder 101.

[0046] Preferably, the first cylinder 101 and the second cylinder 120 are made of the same material as the first mounting base 10 and the second mounting base 12, which is also plastic. The butt welding between the first cylinder 101 and the second cylinder 120 can be carried out by hot air welding. During welding, the lower end of the first cylinder 101 and the upper end of the second cylinder 120 are first heated to melt by hot air flow. Then, the lower end face of the first cylinder 101 and the upper end face of the second cylinder 120 are brought into contact with each other under a predetermined pressure until the material at the joint of the two solidifies together and forms a weld, so as to realize the welding connection of the first cylinder 101 and the second cylinder 120 together.

[0047] Preferably, the welding between the first cylinder 101 and the second cylinder 120 can also be performed by laser welding or the like.

[0048] By welding the first cylinder 101 and the second cylinder 120 together on the lower surface of the first mounting base 10, the heat in the non-welded areas can be reduced, thereby reducing adverse component deformation. Simultaneously, during use, the first mounting base 10 is mounted on the vehicle body, and the air spring's force is mainly concentrated on the upper and lower surfaces of the first mounting base 10 facing the vehicle body. During yaw, the main force area is concentrated on the lower surface of the first mounting base 10. By providing a first cylinder 101 of a predetermined length on the lower surface of the first mounting base 10 and welding it to the second cylinder 120, the welding interface between the second cylinder 120 and the first mounting base 10 can avoid the main force area, further ensuring the structural strength and performance of the air spring piston.

[0049] During the welding process, such as Figure 3As shown, the molten plastic at the weld will be squeezed out from the interface and form extrusions 15 on the inner and outer sides of the weld respectively. After the extrusions 15 solidify, they accumulate on the inner and outer sides of the weld to form ribs, thereby strengthening the welding strength between the first cylinder 101 and the second cylinder 120 and the sealing performance at their interface.

[0050] Preferably, the butt welding of the first cylinder 101 and the second cylinder 120 can be as follows: Figure 4 As shown, no beveling is made at the end faces where the first cylinder 101 and the second cylinder 120 are welded together; or it can be as follows: Figure 5 As shown, a bevel, such as a V-shaped bevel, is provided at the end faces of the first cylinder 101 and the second cylinder 120 that are welded to each other.

[0051] Regarding the airtight connection between the second mounting base 12 and the valve body of the solenoid valve 14, in one embodiment of this application, preferably, as follows: Figure 1 and Figure 2 As shown, the base of the second mounting base 12 faces the airbag 2 of the air spring, and a connecting hole is provided on the base, which is connected to the main chamber inside the airbag 2. A limiting cylinder 121 is formed on the side of the base facing the interior of the secondary chamber, and the limiting cylinder 121 is arranged around the outside of the connecting hole.

[0052] The lower end of the valve body of the solenoid valve 14 is inserted into the limiting cylinder 121 and placed on the base, and the outer wall of the valve body of the solenoid valve 14 is airtightly connected to the inner wall of the limiting cylinder 121; for example, a first sealing element is provided between the outer wall of the valve body of the solenoid valve 14 and the inner wall of the limiting cylinder 121, and the valve body of the solenoid valve 14 is sealed against the limiting cylinder 121 through the first sealing element, thereby ensuring that the secondary chamber has good sealing performance.

[0053] The lower end of the valve body of the solenoid valve 14 is provided with a vent port, namely the first vent port. The first vent port is connected to the connecting hole on the base so that the first vent port can be connected to the main chamber inside the airbag 2 through the connecting hole.

[0054] The solenoid valve 14 is located inside the secondary chamber. The valve body of the solenoid valve 14 is provided with another vent, namely the second vent, which is connected to the secondary chamber. This allows the main chamber to be connected to the secondary chamber through the solenoid valve 14 and to be controlled to open and close by the solenoid valve 14.

[0055] In one embodiment of this application, preferably, as shown below, Figure 1 and Figure 2As shown, a first air passage is provided on the first mounting base 10, and a second air passage is provided on the second mounting base 12. The first air passage and the second air passage are connected. The other end of the second air passage is connected to the main chamber inside the airbag 2, so that the main chamber of the air spring can be connected to the external equipment or external space of the air spring through the first air passage and the second air passage.

[0056] Preferably, the second airway can also be connected to the accessory chamber.

[0057] Regarding the third mounting base 11, one end of the third mounting base 11 is arranged around the upper end of the valve body of the solenoid valve 14 and is airtightly connected to the valve body of the solenoid valve 14.

[0058] For example, a second sealing element is provided between the valve body of the solenoid valve 14 and the third mounting seat 11. The valve body is sealed against the third mounting seat 11 through the second sealing element, thereby ensuring the sealing of the connection between the solenoid valve 14 and the third mounting seat 11 and ensuring that the secondary chamber has good sealing performance.

[0059] The other end of the third mounting base 11 is integrally formed with or welded to the first mounting base 10.

[0060] like Figure 2 and Figure 6 As shown, when the third mounting base 11 and the first mounting base 10 are welded together, the end of the third mounting base 11 that is connected to the first mounting base 10 has an annular connecting portion 110, and the first mounting base 10 has an annular support portion 100. The connecting portion 110 can be mounted on the annular support portion 100, so that the lower surface of the connecting portion 110 contacts and is welded together with the upper surface of the support portion 100.

[0061] The welding connection between the connecting part 110 and the supporting part 100 can be achieved by hot air welding or laser welding.

[0062] During welding, the materials on the lower surface of the connecting part 110 and the upper surface of the support part 100 are first heated to melt by hot air flow. Then, the lower surface of the connecting part 110 and the upper surface of the support part 100 are brought into contact with a predetermined pressure until the material at the joint solidifies and forms a weld. This stably and firmly welds the first mounting seat 10 and the third mounting seat 11 together, ensuring structural strength and airtightness of the secondary chamber.

[0063] like Figure 2 and Figure 6As shown, during the welding process, under pressure, the plastic at the weld joint of the connecting part 110 and the supporting part 100 is squeezed out, and extrusions 15 are formed on the inner and outer sides of the weld joint. After the extrusions 15 are cured, they accumulate on the inner and outer sides of the weld joint to form ribs, thereby strengthening the welding strength between the connecting part 110 and the supporting part 100 and the sealing performance at the joint between them.

[0064] In one embodiment of this application, preferably, as shown below, Figure 1 and Figure 2 As shown, the air spring piston also includes a piston profile 13, which is sleeved on the outside of the first mounting seat 10 and the second mounting seat 12. For the welded connection between the first mounting seat 10 and the second mounting seat 12, where the first mounting seat 10 is welded to the second cylinder 120 of the second mounting seat 12 via the first cylinder 101, the piston profile 13 is sleeved on the outside of the first cylinder 101 and the second cylinder 120, and the upper end of the piston profile 13 abuts against the first mounting seat 10. Positioning ribs are formed on the inner sidewall of the piston profile 13, and there are multiple positioning ribs. The multiple positioning ribs are distributed circumferentially around the piston profile 13. When the piston profile 13 is sleeved on the outside of the first cylinder 101 and the second cylinder 120, the piston profile 13 can form a clearance fit with the outer sidewall of the second cylinder 120 through the positioning ribs, and the positioning ribs can be engaged with the first cylinder 101. Thus, the piston profile 13 is stably and firmly sleeved on the outside of the first cylinder 101 and the second cylinder 120.

[0065] Preferably, such as Figure 2 As shown, a stepped clearance notch 130 is formed at the upper end of the positioning rib and facing the inner side of the first cylinder 101 and the second cylinder 120. The clearance notch 130 is opposite to the first cylinder 101, and the lower end of the clearance notch 130 extends to the bottom of the weld between the first cylinder 101 and the second cylinder 120. Thus, a clearance space is formed at the position opposite to the weld through the clearance notch 130 to avoid the extrusion 15 formed on the outside of the weld when the first cylinder 101 and the second cylinder 120 are welded.

[0066] Preferably, such as Figure 2 and Figure 7As shown, the clearance notch 130 includes a first sidewall, which is opposite to the first cylinder 101 and spaced at a predetermined distance, and has a snap-fit ​​groove. A snap-fit ​​protrusion 102 is formed on the outer sidewall of the first cylinder 101 along the circumference of the first cylinder 101, and the snap-fit ​​protrusion 102 has an installation slope. When the piston profile 13 moves along the axial direction of the first cylinder 101 to be fitted onto the outside of the first cylinder 101, the snap-fit ​​protrusion 102 can be squeezed and deformed by the installation slope with the first sidewall until the upper end of the piston profile 13 moves to abut against the first mounting seat 10. Then, the snap-fit ​​protrusion 102 extends into the snap-fit ​​groove and is snapped into the snap-fit ​​groove, thereby stably and firmly fitting the piston profile 13 onto the outside of the first cylinder 101 and the second cylinder 120, preventing the piston profile 13 from loosening.

[0067] Preferably, the piston profile 13 and its inner positioning rib are both made of plastic and are integrally formed to make the piston profile 13 lighter.

[0068] Preferably, the piston profile 13 and its inner positioning ribs are both made of glass fiber reinforced PA, which makes the piston profile 13 lighter while ensuring that the piston profile 13 has high structural strength.

[0069] This application also provides an air spring, such as Figure 1 As shown, an air spring piston includes any of the above embodiments.

[0070] In this embodiment, the air spring includes an air spring piston, and therefore the air spring has all the beneficial effects of an air spring piston, which will not be described in detail here.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air spring piston characterized in that, The air spring piston comprises a first mounting base, a second mounting base, a third mounting base and a solenoid valve; The first mounting base is used for mounting on a vehicle body of a motor vehicle, one end of the solenoid valve is connected with the first mounting base through the second mounting base, and the other end of the solenoid valve is connected with the first mounting base through the third mounting base, so as to form a sub-chamber by surrounding the first mounting base, the second mounting base, the third mounting base and a valve body of the solenoid valve; The second mounting base is used for airtight connection with an air bag of an air spring, and the sub-chamber is communicated with a main chamber in the air bag through the solenoid valve; The first mounting base and the second mounting base are welded together, and the first mounting base and the third mounting base are welded together; The second mounting base comprises a second cylinder body; The first mounting base is integrally formed with a first cylinder body, the first cylinder body is matched with the second cylinder body, so that the first cylinder body and the second cylinder body can be welded together with end faces opposite to each other; The air spring piston further comprises a piston section, and a plurality of positioning ribs are formed on an inner side wall of the piston section and spaced apart along a circumferential direction of the piston section; For the welded first cylinder body and second cylinder body, the piston section is sleeved on the outer side of the first cylinder body and the second cylinder body, the positioning ribs are clamped with the first cylinder body, and the piston section is clearance-fitted with the outer side wall of the second cylinder body through the positioning ribs; A stepped avoiding gap is formed on the inner side of one end of the positioning rib towards the first mounting base, so as to form an avoiding space at the weld joint of the first cylinder body and the second cylinder body, thereby avoiding extrusion at the weld joint; The avoiding gap is formed with a first side wall opposite to the first cylinder body and spaced apart by a predetermined distance, and a clamping groove is formed in the first side wall; A clamping protrusion is formed on the outer side wall of the first cylinder body along the circumferential direction of the first cylinder body, and the clamping protrusion is formed with a mounting inclined surface; When the piston section moves along the axial direction of the first cylinder body to be sleeved on the first cylinder body, the clamping protrusion can be deformed by means of the mounting inclined surface to extend into the clamping groove, so that the clamping protrusion is clamped in the clamping groove.

2. The air spring piston of claim 1, wherein, When the second cylinder body is welded with the first mounting base, a bevel is formed at the cross section of the first cylinder body and the second cylinder body which are welded relative to each other.

3. The air spring piston of claim 1, wherein, The second mounting base further comprises a base, the second cylinder body is surrounded by the circumferential side of the base, and the second cylinder body and the base are integrally formed; The base is formed with a communication hole, the communication hole is communicated with the air bag, one side of the base towards the inside of the sub-chamber is formed with a limiting cylinder, and the limiting cylinder is arranged around the outer side of the communication hole; One end of the valve body is inserted into the limiting cylinder and carried on the base, a first air inlet of the valve body is opposite to and communicated with the communication hole, and a second air inlet of the valve body is communicated with the sub-chamber; A first sealing member is arranged between the valve body and the limiting cylinder, and the valve body is sealingly abutted with the limiting cylinder through the first sealing member.

4. The air spring piston of claim 1, wherein, One end of the third mounting seat is arranged around the outside of one end of the valve body away from the second mounting seat; A second sealing element is arranged between the third mounting seat and the valve body, and the valve body is sealed against the third mounting seat through the second sealing element; The first mounting seat is formed with an annular support portion, and one end of the third mounting seat away from the electromagnetic valve is formed with an annular connecting portion which is mounted on and welded to the support portion.

5. The air spring piston of claim 1, wherein, A first air channel is formed in the first mounting seat, and a second air channel is formed in the second mounting seat; One end of the second air channel is in communication with the first air channel, and the other end of the second air channel is in communication with the main cavity or the auxiliary cavity.

6. The air spring piston of claim 1, wherein, The first mounting seat, the second mounting seat, the third mounting seat, and the piston are made of glass fiber reinforced polyamide plastic.

7. An air spring characterized by, An air spring piston comprising the air spring piston of any one of claims 1 to 6.

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