A piston assembly having a rotary bearing

Abstract

The present application relates to air spring technical field, specifically to a kind of piston assembly containing rotating bearing, including installation cover located at top, first shell being arranged below the installation cover, rotating bearing being buckled between the installation cover and the first shell, second shell being welded below the first shell, the installation cover includes mating surface, abutting portion located around the mating surface and buckling piece, the first shell includes upper top seat, the upper top seat is substantially cylindrical, substantially cylindrical cavity is formed in the upper top seat, the top of the upper top seat is provided with buckling part, the rotating bearing is end face bearing rotating up and down, the bottom end of the rotating bearing is provided with limiting portion, the limiting portion is annular.The rotating bearing is buckled and installed between the installation cover and the first shell, relative rotation is realized, service life is increased, and the stability of assembly is also guaranteed, convenient to install and disassemble.

Description

Technical Field

[0001] This invention relates to the field of air spring technology, and more specifically to a piston assembly containing a rotating bearing. Background Technology

[0002] Currently, air springs are considered an ideal elastic element, possessing ideal nonlinear mechanical properties, and are widely used in various fields such as commercial vehicle cabs, train secondary suspensions, vehicle suspensions, and equipment vibration damping. The application of air springs provides vehicles with excellent ride comfort.

[0003] During operation, the air spring not only moves vertically up and down but also twists along its axis. While some existing structures incorporate bearings between the vehicle body and the air spring, the assembly stability is poor, the bearings are prone to misalignment, and the assembly process is complex.

[0004] Therefore, it is necessary to provide a new piston assembly containing a rotating bearing. Summary of the Invention

[0005] Based on the above-mentioned problems existing in the prior art, the purpose of this invention is to provide a piston assembly containing a rotating bearing that fastens the rotating bearing between the mounting cover and the first housing, thereby achieving relative rotation, increasing service life, ensuring assembly stability, and facilitating installation and disassembly.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention discloses a piston assembly containing a rotating bearing, including a mounting cover located at the top, a first housing disposed below the mounting cover, a rotating bearing fastened between the mounting cover and the first housing, and a second housing welded below the first housing. The mounting cover includes a mating surface, a retaining portion located around the mating surface, and a fastening member. The first housing includes an upper top seat, which is generally cylindrical in shape, and the interior of the upper top seat forms a generally cylindrical cavity. The top of the upper top seat is provided with a fastening portion, which is annular in shape. The rotating bearing is an end face bearing that rotates up and down, and the bottom end of the rotating bearing is provided with a limiting portion, which is annular in shape.

[0007] Furthermore, the mounting cover also includes a mounting member disposed at the upper top end, the mounting member being adapted to be installed in conjunction with the vehicle body.

[0008] Furthermore, the mating surface is generally an annular plane, and the mating surface is adapted to abut against the upper end face of the rotating bearing.

[0009] Furthermore, the supporting part is annular, and an installation groove is provided on the side of the supporting part, the installation groove occupying about one-quarter of the annular supporting part.

[0010] Furthermore, the fastening element is disposed at the bottom end of the abutment portion, and three fastening elements are provided, which are adapted to fasten with the first housing.

[0011] Furthermore, the outer diameter of the limiting part matches the diameter of the cylindrical cavity inside the upper top seat.

[0012] Furthermore, the first housing also includes an upper platform portion integrally formed with the upper top seat, a mounting cavity disposed below the upper platform portion, and an upper connecting portion.

[0013] Furthermore, the first housing also includes an air inlet and a first air inlet channel disposed on one side of the upper top seat.

[0014] Furthermore, the second housing includes an inner housing and an outer housing disposed outside the inner housing.

[0015] Furthermore, the piston assembly containing the rotating bearing also includes a solenoid valve installed inside the second housing, a flattened steel wire retaining ring, and a first sealing ring and a second sealing ring disposed outside the solenoid valve.

[0016] The beneficial effects of this invention are as follows: The piston assembly containing a rotating bearing of this invention includes a mounting cover at the top, a first housing disposed below the mounting cover, a rotating bearing fastened between the mounting cover and the first housing, and a second housing welded below the first housing. The mounting cover includes a mating surface, a retaining portion located around the mating surface, and a fastening element. The first housing includes an upper top seat, which is generally cylindrical in shape, and has a generally cylindrical cavity inside. The top of the upper top seat is provided with a fastening portion. The rotating bearing is an end face bearing that rotates up and down, and the bottom end of the rotating bearing is provided with a limiting portion, which is annular in shape. By fastening the rotating bearing between the mounting cover and the first housing, the piston assembly containing the rotating bearing of this invention achieves relative rotation, increasing service life, while also ensuring assembly stability and facilitating installation and disassembly. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the piston assembly containing a rotating bearing according to the present invention;

[0019] Figure 2 This is a cross-sectional view of the piston assembly containing a rotating bearing according to the present invention;

[0020] Figure 3 This is a schematic diagram of the mounting cover of the present invention;

[0021] Figure 4 This is a structural schematic diagram of the mounting cover of the present invention from another perspective;

[0022] Figure 5 This is a schematic diagram of the rotating bearing of the present invention;

[0023] Figure 6 This is a structural schematic diagram of the rotating bearing of the present invention from another perspective;

[0024] Figure 7 This is a schematic diagram of the structure of the first housing of the present invention;

[0025] Figure 8 This is a structural schematic diagram of the first housing of the present invention from another perspective;

[0026] Figure 9 This is a schematic diagram of the structure of the second housing of the present invention;

[0027] Figure 10 This is a structural schematic diagram of the second housing of the present invention from another perspective;

[0028] Figure 11 This is a partial exploded view of the second housing of the present invention.

[0029] The component names and their numbers in the diagram are as follows:

[0030] Mounting cover 1, mounting part 11, mating surface 12, supporting part 13, mounting groove 131, fastening part 14;

[0031] First housing 2, upper top seat 21, fastening part 211, first reinforcing rib 212, mounting port 213, upper platform part 22, first welding vent hole 221, mounting cavity 23, snap ring groove 231, upper connecting part 24, first upper connecting protrusion 241, second upper connecting protrusion 242, air inlet 25, first air inlet channel 26;

[0032] Rotary bearing 3, limiting part 31;

[0033] Second housing 4, inner housing 41, vent 411, mounting part 412, second reinforcing rib 413, annular protrusion 414, lower connecting part 42, first lower connecting protrusion 421, second lower connecting protrusion 422, lower platform part 423, second welding vent 4231, outer housing 43, strip protrusion 431, second air intake channel 44, lower base 45, thread 451;

[0034] Solenoid valve 5; flattened steel wire retaining ring 6; first sealing ring 7; second sealing ring 8. Detailed Implementation

[0035] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0036] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0037] 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and 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 present invention.

[0039] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0040] like Figure 1 , Figure 2 As shown, the present invention provides a piston assembly 100 containing a rotating bearing, including a mounting cover 1 located at the top, a first housing 2 disposed below the mounting cover 1, a rotating bearing 3 fastened between the mounting cover 1 and the first housing 2, a second housing 4 welded below the first housing 2, and a solenoid valve 5 installed inside the second housing 4.

[0041] In an embodiment of the invention, the mounting cover 1 is connected to the vehicle body; the bottom of the piston assembly 100 containing the rotating bearing is connected to an air spring airbag and a mounting base (not shown in the figure), and the mounting base is connected to the vehicle chassis. The mounting base is located at the bottom of the air spring airbag, and the piston assembly 100 containing the rotating bearing is located above the air spring airbag. The piston assembly 100 containing the rotating bearing and the mounting base respectively seal the upper and lower ends of the air spring airbag to form a sealed cavity with adjustable volume. An external air pump inflates the air spring airbag through the air inlet, causing the piston assembly 100 containing the rotating bearing to move upward, thus pushing the vehicle body upward and achieving vehicle vibration reduction.

[0042] In some of these embodiments, such as Figure 3 , Figure 4 As shown, the mounting cover 1 is located at the top and includes a mounting member 11 at the top, a mating surface 12 at the bottom, a retaining portion 13 around the mating surface, and a fastening member 14. The mounting member 11 is located at the top of the mounting cover 1 and is adapted to be installed with the vehicle body. The mating surface 12 is approximately an annular plane and is adapted to abut against the upper end face of the rotating bearing 3. The retaining portion 13 is annular, and its inner diameter is slightly larger than the diameter of the rotating bearing 3, thereby facilitating the retaining of the rotating bearing 3 around its perimeter and preventing displacement or detachment. A mounting groove 131 is provided on the side of the retaining portion 13, which occupies approximately one-quarter of the annular retaining portion 13. The mounting groove 131 facilitates the disassembly and assembly of the mounting cover 1, the first housing 2, and the rotating bearing 3. The fastening element 14 is provided at the bottom end of the supporting part 13. There are three fastening elements 14. The fastening elements 14 are adapted to fasten with the first housing 2, thereby fastening the rotating bearing 3 between the mounting cover 1 and the first housing 2.

[0043] In some of these embodiments, such as Figure 7 , Figure 8 As shown, the first housing 2 includes an upper top seat 21, which is generally cylindrical, and the interior of the upper top seat 21 forms a generally cylindrical cavity. A fastening part 211 is provided at the top of the upper top seat 21. The fastening part 211 is annular, and its inner diameter is the same as the diameter of the cylindrical cavity inside the upper top seat 21. The diameter of the fastening part 211 matches the inner diameter of the abutting part 13 of the mounting cover 1, and the outer diameter of the fastening part 211 is slightly larger than the outer diameter of the upper top seat 21. This abuts the upper end face of the rotating bearing 3 against the mating surface 12 of the mounting cover 1. The rotating bearing 3 is placed on the fastening part 211 of the first housing 2, and the abutting part 13 surrounds the outside of the rotating bearing 3. Three fastening pieces 14 are fastened to the fastening part 211, thus fastening the rotating bearing 3 between the mounting cover 1 and the first housing 2.

[0044] Furthermore, a first reinforcing rib 212 is provided around the outer side of the upper top seat 21 to improve the strength of the upper top seat 21. An installation opening 213 is also provided on one side of the upper top seat 21. The installation opening 213 is square and suitable for passing through and placing the wire of the solenoid valve 5.

[0045] In some of these embodiments, such as Figure 4 , Figure 5 As shown, the rotating bearing 3 is installed between the mounting cover 1 and the first housing 2. The rotating bearing 3 is an end face bearing that rotates up and down, thereby enabling relative rotation between the mounting cover 1 and the first housing 2. The bottom end of the rotating bearing 3 is also provided with a limiting part 31. The limiting part 31 is annular, and the outer diameter of the limiting part 31 matches the diameter of the cylindrical cavity inside the upper top seat 21. This allows the limiting part 31 to be positioned above the cylindrical cavity inside the upper top seat 21, further limiting the rotation of the rotating bearing 3 and preventing it from shifting under external force. Therefore, the upper end face of the rotating bearing 3 abuts against the mating surface 12 of the mounting cover 1; the lower end face of the rotating bearing 3 abuts against the upper end face of the fastening part 211 of the upper top seat 21, and the limiting part 31 of the rotating bearing 3 is placed in the cylindrical cavity inside the upper top seat 21 for limiting; and the rotating bearing 3 is fastened between the fastening part 14 of the mounting cover 1 and the fastening part 211 of the first housing 2, thereby realizing the fastening and installation of the rotating bearing 3 between the mounting cover 1 and the first housing 2, which not only ensures the stability of the assembly between the mounting cover 1, the first housing 2 and the rotating bearing 3, but also facilitates installation and disassembly. Furthermore, by providing the feature of fastening and installing the rotating bearing 3 between the mounting cover 1 and the first housing 2, when the air spring as a whole is subjected to a lateral rotational force during operation, the mounting cover 1, the first housing 2 and the integrally welded second housing 4 can achieve relative rotation through the rotating bearing 3, thereby protecting the air spring's air bladder and increasing its service life.

[0046] In some embodiments, the first housing 2 is integrally injection molded, and the first housing 2 also includes an upper platform portion 22 integrally formed with an upper top seat 21, an installation cavity 23 located at the lower center of the upper platform portion 22, an upper connecting portion 24 located below the upper platform portion 22, an air inlet 25 located on one side of the upper top seat 21, and a first air inlet channel 26.

[0047] Specifically, the upper platform 22 is connected to the lower part of the upper top seat 21. The upper platform 22 is roughly in the shape of a circular plate. The outer diameter of the upper platform 22 is larger than the diameter of the upper top seat 21. A first welding vent 221 is provided on the part of the upper platform 22 located on the outer side of the upper top seat 21. The first welding vent 221 is provided through the upper end face and the lower end face of the upper platform 22. Multiple first welding vents 221 are provided and are evenly provided on the upper platform 22 in a circumferential direction.

[0048] Specifically, the mounting cavity 23 is located at the lower center of the upper platform portion 22. The diameter of the mounting cavity 23 matches the inner diameter of the upper platform portion 22, and the diameter of the mounting cavity 23 is smaller than the inner diameter of the upper top seat 21. The mounting cavity 23 is suitable for mounting the upper part of the solenoid valve 5. A snap ring groove 231 is also provided on the inner wall of the mounting cavity 23. The snap ring groove 231 is annular and is formed on the inner wall of the mounting cavity 23.

[0049] Specifically, the upper connecting portion 24 is located on the lower end face of the upper platform portion 22. The upper connecting portion 24 includes a first upper connecting protrusion 241 and a second upper connecting protrusion 242. The first upper connecting protrusion 241 and the second upper connecting protrusion 242 are cylindrical with a small height, and the heights of the first upper connecting protrusion 241 and the second upper connecting protrusion 242 are the same. The diameter of the first upper connecting protrusion 241 is smaller than the diameter of the second upper connecting protrusion 242. The first welding vent 221 located on the upper platform portion 22 is located between the first upper connecting protrusion 241 and the second upper connecting protrusion 242.

[0050] Specifically, the air inlet 25 is located on one side of the upper top seat 21 and is connected to an external air pump, suitable for inflating the air spring airbag. The top of the first air intake channel 26 is connected to the air inlet 25, and the first air intake channel 26 is located inside the upper top seat 21.

[0051] In some of these embodiments, such as Figure 9-11 As shown, the second housing 4 is welded and disposed below the upper platform portion 22 of the first housing 2. The second housing 4 includes an inner housing 41, a lower connecting portion 42 located above the inner housing 41, an outer housing 43 disposed outside the inner housing 41, a second air intake channel 44 disposed inside the inner housing 41, and a lower base 45 disposed below the inner housing 41.

[0052] Specifically, the inner housing 41 is generally cylindrical, with an internal cylindrical cavity suitable for mounting the solenoid valve 5. The mounting cavity 23 of the first housing 2 is also fitted within the upper portion of the internal cylindrical cavity. A vent 411 is provided at the center of the bottom of the inner housing 41, allowing ventilation when the solenoid valve 5 is opened. An annular mounting portion 412 is provided around the vent 411, suitable for fixing the bottom end of the solenoid valve 5. Multiple arc-shaped second reinforcing ribs 413 are also provided on the inner wall of the inner housing 41 to improve its strength. Multiple annular protrusions 414 are provided on the outer wall of the inner housing 41, evenly distributed axially.

[0053] Specifically, the lower connecting portion 42 is integrally disposed above the inner housing 41. The lower connecting portion 42 includes a first lower connecting protrusion 421, a second lower connecting protrusion 422, and a lower platform portion 423 located below the first lower connecting protrusion 421 and the second lower connecting protrusion 422. The first lower connecting protrusion 421 and the second lower connecting protrusion 422 are cylindrical with a relatively small height, and the first lower connecting protrusion 421 and the second lower connecting protrusion 422 have the same height. The diameter of the first lower connecting protrusion 421 is smaller than that of the second lower connecting protrusion 422. The diameter of the first lower connecting protrusion 421 is the same as that of the first upper connecting protrusion 241, and the diameter of the second lower connecting protrusion 422 is the same as that of the second upper connecting protrusion 242, thereby facilitating welding of the first lower connecting protrusion 421 to the first upper connecting protrusion 241 and welding of the second lower connecting protrusion 422 to the second upper connecting protrusion 242. The lower platform portion 423 is located below the second lower connecting protrusion 422 and the second upper connecting protrusion 242. The lower platform portion 423 is approximately an annular plate shape, and its outer diameter is smaller than that of the upper platform portion 22. The inner diameter of the lower platform portion 423 is the same as that of the inner shell 41. A second welding vent hole 4231 is provided on the lower platform portion 423. The second welding vent hole 4231 is provided through the upper and lower end faces of the lower platform portion 423. Multiple second welding vent holes 4231 are provided and are evenly distributed circumferentially on the lower platform portion 423. The second welding vent holes 4231 are located between the second lower connecting protrusion 422 and the second upper connecting protrusion 242. The first housing 2 and the second housing 4 are subjected to injection molding hot melt welding, that is, the upper connecting part 24 and the lower connecting part 42 are directly injection molded hot melt welded, the first lower connecting protrusion 421 is welded to the first upper connecting protrusion 241 and the second lower connecting protrusion 422 is welded to the second upper connecting protrusion 242 respectively, and the welding is vented through the first welding vent hole 221 and the second welding vent hole 4231, thereby ensuring the quality of the first housing 2 and the second housing 4.

[0054] Specifically, the outer shell 43 is roughly cylindrical and is fitted onto the outer side of the inner shell 41. The top end of the outer shell 43 is hot-melt welded to the lower end face of the lower platform portion 423. Multiple vertically arranged strip-shaped protrusions 431 are provided on the inner wall of the outer shell 43. These protrusions are evenly distributed circumferentially. Since the multiple circumferentially arranged vertically arranged strip-shaped protrusions 431 on the inner wall of the outer shell 43 engage with and abut against the multiple axially arranged annular protrusions 414 on the outer side wall of the inner shell 41, point contact between the strip-shaped protrusions 431 and the annular protrusions 414 facilitates the installation of the inner shell 41 and the outer shell 43 while also ensuring the strength of the second shell 4.

[0055] Specifically, the second air intake channel 44 is located inside the inner housing 41, and its top is connected to the first air intake channel 26. The bottom end of the second air intake channel 44 is located in the internal cavity of the lower base 45, suitable for connecting with the cavity of the air spring bladder. This allows gas input from an external air pump to sequentially pass through the air inlet 25, the first air intake channel 26, and into the second air intake channel 44, finally entering the cavity of the air spring bladder through the internal cavity of the lower base 45. The lower base 45 is approximately cylindrical, and its outer diameter is the same as the outer diameter of the inner housing 41. A thread 451 is provided on the outer wall of the lower base 45 for easy fixed connection with the air spring bladder (not shown in the figure).

[0056] In some embodiments, the solenoid valve 5 is fixed inside the second housing 4. Specifically, the upper end of the solenoid valve 5 is installed in the mounting cavity 23 of the first housing 2, and the lower end of the solenoid valve 5 is installed in the annular mounting portion 412 of the second housing 4. When the solenoid valve 5 is closed, a sealed air chamber is formed inside the air spring bladder; when the solenoid valve 5 is open, the air chamber formed inside the air spring bladder communicates with the outside through the vent 411 of the second housing 4, thereby realizing the change of the internal volume of the air spring and the change of the air spring stiffness. Under different road conditions, it can provide both good operability and good comfort.

[0057] The piston assembly 100 containing the rotating bearing of the present invention also includes a flattened steel wire retaining ring 6, which is installed in the snap ring groove 231 of the mounting cavity 23 to limit the solenoid valve 5 and prevent the solenoid valve 5 from moving upward.

[0058] The piston assembly 100 containing a rotating bearing of the present invention further includes a first sealing ring 7 and a second sealing ring 8. Both the first sealing ring 7 and the second sealing ring 8 are made of elastic material and are O-ring shaped. The first sealing ring 7 abuts against the inner wall of the mounting cavity 23 of the first housing 2 and the outer wall of the solenoid valve 5. The second sealing ring 8 abuts against the inner wall of the annular mounting portion 412 of the second housing 4 and the outer wall of the solenoid valve 5. The first sealing ring 7 and the second sealing ring 8 provide a sealing effect, ensuring the airtightness of the piston assembly 100.

[0059] The piston assembly 100 containing a rotating bearing of the present invention includes a mounting cover 1 at the top, a first housing 2 disposed below, a rotating bearing 3 fastened between the mounting cover 1 and the first housing 2, a second housing 4 welded below the first housing 2, and a solenoid valve 5 installed inside the second housing 4. A mounting member 11 is provided on the top of the mounting cover 1, which is suitable for installation with a car body. The abutment portion 13 of the mounting cover 1 is annular, and its inner diameter is slightly larger than the diameter of the rotating bearing 3, thereby facilitating the limiting of the rotating bearing 3 around its perimeter by the abutment portion 13 and preventing the rotating bearing 3 from shifting or falling off. A mounting groove 131 is provided on the side of the abutment portion 13, occupying approximately one-quarter of the annular abutment portion 13. The slot 131 facilitates the disassembly and assembly of the mounting cover 1, the first housing 2, and the rotating bearing 3. A fastening element 14 is provided on the mounting cover 1, and a fastening part 211 is provided on the first housing 2. The upper end face of the rotating bearing 3 abuts against the mating surface 12 of the mounting cover 1. The rotating bearing 3 is placed on the fastening part 211 of the first housing 2, and the abutting part 13 surrounds the outside of the rotating bearing 3. The three fastening elements 14 are fastened to the fastening part 211, thus fastening the rotating bearing 3 between the mounting cover 1 and the first housing 2. A limiting part 31 is also provided at the bottom end of the rotating bearing 3, allowing the limiting part 31 to be positioned above the cylindrical cavity inside the upper top seat 21, further limiting the left and right movement of the rotating bearing 3 and preventing displacement due to external forces. The piston assembly 100 containing a rotating bearing of the present invention ensures the stability of the assembly between the mounting cover 1, the first housing 2 and the rotating bearing 3 by fastening the rotating bearing 3 between the mounting cover 1 and the first housing 2, and facilitates installation and disassembly. Furthermore, by fastening the rotating bearing 3 between the mounting cover 1 and the first housing 2, when the air spring is subjected to a lateral rotational force during operation, the mounting cover 1, the first housing 2 and the integrally welded second housing 4 can achieve relative rotation through the rotating bearing 3, thereby protecting the air spring's air bladder and increasing its service life.

[0060] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A piston assembly containing a rotating bearing, characterized in that, The system includes a mounting cover at the top, a first housing located below the mounting cover, a rotating bearing fastened between the mounting cover and the first housing, and a second housing welded below the first housing. The mounting cover includes a mating surface, a retaining portion around the mating surface, and a fastening element. The first housing includes an upper top seat, which is generally cylindrical with a generally cylindrical cavity inside. A fastening portion, which is annular, is located at the top of the upper top seat. The rotating bearing is an end-face bearing that rotates vertically. The bottom end of the rotating bearing is provided with a limiting part, which is annular in shape. The mating surface is approximately an annular plane and is adapted to abut against the upper end face of the rotating bearing. The abutting part is annular in shape and has a mounting groove on its side, which occupies one-quarter of the annular abutting part. Three fastening members are provided at the bottom end of the abutting part and are adapted to fasten with the first housing. The outer diameter of the limiting part matches the diameter of the cylindrical cavity inside the upper top seat.

2. The piston assembly containing a rotating bearing according to claim 1, characterized in that, The mounting cover also includes a mounting element located at the top, the mounting element being adapted to be installed in conjunction with a vehicle body.

3. The piston assembly containing a rotating bearing according to claim 1, characterized in that, The first housing also includes an upper platform portion integrally formed with the upper top seat, a mounting cavity disposed below the upper platform portion, and an upper connecting portion.

4. The piston assembly containing a rotating bearing according to claim 1, characterized in that, The first housing also includes an air inlet and a first air inlet channel disposed on one side of the upper top seat.

5. The piston assembly containing a rotating bearing according to claim 1, characterized in that, The second housing includes an inner housing and an outer housing disposed outside the inner housing.

6. The piston assembly containing a rotating bearing according to claim 1, characterized in that, The piston assembly containing the rotating bearing also includes a solenoid valve installed inside the second housing, a flattened steel wire retaining ring, and a first sealing ring and a second sealing ring disposed outside the solenoid valve.

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