Actuator assembly, suspension system and vehicle

Abstract

The utility model discloses an actuator assembly, a suspension system and a vehicle, the actuator assembly comprises a first damping device and a second damping device, the first damping device comprises a fixed part and a movable part which are movably connected in the first direction, and the second damping device comprises a piston part and a cavity part which are movably connected in the first direction; one of the fixed part and the movable part is suitable for being connected with a vehicle body, and the other one of the fixed part and the movable part is suitable for being connected with an axle or a wheel; wherein the cavity part is provided with a working cavity, the working cavity is provided with an inner cavity and an outer cavity which are communicated with each other, the piston part is movably arranged in the inner cavity, an air nozzle support is arranged on the cavity part, the air nozzle support is communicated with the outer cavity, and the outer cavity is filled and released through the air nozzle support. Therefore, the charging and discharging operation difficulty can be reduced, the air tap support can be used for real-time pressure detection at the same time, the pressure detection difficulty can be reduced, the charging and discharging difficulty and the pressure detection difficulty of the working cavity are reduced, and the operation convenience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vibration damping, and more particularly to an actuator assembly, a suspension system, and a vehicle. Background Art

[0002] In the related art, the actuator assembly can adjust the height of the vehicle by adjusting the height of the first damping device. The actuator assembly can further couple the first damping device with the second damping device to absorb the vibration of the road surface excitation and improve the comfort.

[0003] Among them, during the working process of the second damping device, it is necessary to maintain the pressure stability. Therefore, it is necessary to monitor the working pressure of the second damping device in real time, and it is necessary to maintain the working pressure of the second damping device within the required pressure range by charging and discharging operations on the working chamber (such as: filling or releasing a pressure medium). In the existing actuator assembly structure, it is difficult to obtain the working pressure of the second damping device, and it is necessary to frequently disassemble and assemble the second damping device, and the operation difficulty of charging and discharging is large. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present application is to provide an actuator assembly, and the working pressure detection and charging / discharging operation of the actuator assembly are simpler and more convenient.

[0005] The present application further provides a suspension system using the above actuator assembly.

[0006] The present application also provides a vehicle having the above suspension system.

[0007] In a first aspect, the present application provides an actuator assembly, including: a first damping device and a second damping device. The first damping device includes a fixed part and a movable part movably connected in the first direction. The second damping device includes a piston part and a cavity part movably connected in the first direction. The movable part is connected to the piston rod of the piston part, and one of the fixed part and the movable part is adapted to be connected to the vehicle body, and the other is adapted to be connected to the axle or the wheel. Wherein the cavity part has a working chamber, and the working chamber has an inner cavity and an outer cavity communicating with each other. The piston part is movably disposed in the inner cavity. A nozzle support is disposed on the cavity part. The nozzle support communicates with the outer cavity and is adapted to realize the charging and discharging of the outer cavity through the nozzle support.

[0008] According to the actuator assembly of the embodiments of the present application, by providing a nozzle support on the cavity part, the nozzle of the charging and discharging device can be directly connected to the nozzle support to achieve the charging and discharging operations of the working cavity, reducing the difficulty of the charging and discharging operations. Moreover, the nozzle support can also be used for real-time pressure detection, reducing the difficulty of pressure detection, thereby reducing the difficulty of charging and discharging the working cavity and pressure detection, and improving the operation convenience.

[0009] According to some embodiments of the present application, the cavity part includes a first connection shell and a second connection shell connected to each other. The first connection shell and the second connection shell define a working cavity. The first connection shell is movably connected to the movable part. The second connection shell includes a first cylinder and a second cylinder. The first cylinder and the second cylinder are spaced apart in the radial direction to divide the working cavity into an inner cavity and an outer cavity that communicate with each other. The nozzle support is formed on the first cylinder.

[0010] Further, the piston part further includes a piston assembly. The piston assembly is connected to the piston rod. The second cylinder, the first connection shell, and the piston assembly divide the inner cavity into a first sub-cavity and a second sub-cavity that communicate with each other. The piston rod is located in the first sub-cavity, and the cavity part is adapted to move relative to the piston assembly under the action of a pressure medium.

[0011] Further, the first connection shell includes a first flange. The first flange is connected to the second connection shell.

[0012] Further, the first connection shell further has a second flange opposite to the first flange in the first direction.

[0013] Further, one end of the first cylinder facing the first connection shell is provided with a third flange. The third flange is connected to the first connection shell.

[0014] According to some embodiments of the present application, the second damping device further includes: a cage. The cage is disposed between the first cylinder and the second cylinder and is adapted to fix the second cylinder.

[0015] Further, the piston assembly includes a piston body and a first valve provided on the piston body. The piston body is connected to the piston rod. The first valve is adapted to communicate the first sub-cavity with the second sub-cavity under the action of pressure.

[0016] Further, a buffer member is further provided on one side of the piston body facing the first damping device.

[0017] In some embodiments, a second valve is further provided at one end of the second cylinder away from the first damping device. The second valve is adapted to communicate the second sub-chamber with the outer chamber under pressure to supply a pressure medium to the second sub-chamber or extract the pressure medium in the second sub-chamber.

[0018] According to some embodiments of the present application, the fixing portion includes a fixing shell, a power source, and a transmission group. The power source is disposed in the fixing shell, the fixing shell is movably connected to the movable shell, the transmission group includes a power input end and a power output end, the power input end is power-connected to the power source, and the power output end is disposed on the movable shell and is power-connected to the power output end to drive the movable shell to move relative to the fixing shell.

[0019] Further, the transmission group is configured as a ball screw transmission portion or a gear rack transmission portion.

[0020] Further, the fixing shell includes: a motor shell and a guiding shell. The power source is disposed in the motor shell. One end of the guiding shell is connected to the motor shell, and the other end forms an open mouth. At least a part of the movable shell is movably disposed in the guiding shell via the open mouth.

[0021] Further, the guiding shell includes a first shell segment, a second shell segment, and a third shell segment connected in sequence in the first direction. The first shell segment is connected to the motor shell through a flange edge. The second shell segment is adapted to accommodate the transmission group and is used for stroke limitation of the transmission group. The third shell segment is sleeved on the first shell and is adapted to provide movement guidance for the first shell.

[0022] Further, the actuator assembly further includes a lower fork arm, and the lower fork arm is connected to the first cylinder or the first cylinder is integrally formed with the lower fork arm.

[0023] In a second aspect, an embodiment of the present application provides a suspension system, including the actuator assembly described in the above embodiments.

[0024] In a third aspect, an embodiment of the present application provides a vehicle, including: the suspension system described in the above embodiments.

[0025] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1Schematic diagram of an actuator assembly according to an embodiment of the present application;

[0028] Figure 2 Cross-sectional schematic diagram of an actuator assembly according to an embodiment of the present application;

[0029] Figure 3 Schematic diagram of the cooperation of a movable housing, a second damping device, and a lower fork arm according to an embodiment of the present application;

[0030] Figure 4 Schematic diagram of a second connection housing according to an embodiment of the present application;

[0031] Figure 5 Cross-sectional schematic diagram of a second connection housing according to an embodiment of the present application.

[0032] Reference numerals:

[0033] Actuator assembly 100,

[0034] First damping device 10, fixing part 11, fixing housing 111, motor housing 1111, guiding housing 1112, first housing section 11121, second housing section 11122, third housing section 11123, power source 112, transmission group 113, power input end 1131, power output end 1132, movable part 12, movable housing 121,

[0035] Second damping device 20, piston part 21, piston rod 211, piston assembly 212, piston body 2121, first valve 2122, buffer member 2123, cavity part 22, first connection housing 221, first flange 2211, first sleeve 2212, second flange 2213, second connection housing 222, first cylinder 2221, third flange 22211, air nozzle support 22212, second cylinder 2222, second valve 22221, cage 23, seal 24,

[0036] Sliding bearing 30, lower fork arm 40,

[0037] Inner cavity a, first sub-cavity a1, second sub-cavity a2, outer cavity b. Detailed implementation manners

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application shall have the same meanings as commonly understood by those of ordinary skill in the technical field to which this application pertains; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", and "attached" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The term "and / or" in this application is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0043] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0045] In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0046] In the description of the present application, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0047] The term "plurality" as used in the present application refers to two or more (including two).

[0048] Reference is made below to Figures 1-5 describe an actuator assembly and a vehicle according to an embodiment of the present application.

[0049] As Figure 1 、 Figure 2 and Figure 3 shown, the present application provides an actuator assembly 100, including: a first damping device 10, a second damping device 20.

[0050] Wherein, the actuator assembly 100 is disposed between the axle and the vehicle body, or between the wheel and the vehicle body. The actuator assembly 100 is adapted to buffer the vibration and impact generated by road excitation and transmit them to the vehicle body, so as to reduce the swing of the vehicle body after being excited by road excitation and improve the comfort.

[0051] Furthermore, the actuator assembly 100 includes a first damping device 10 and a second damping device 20, such that the actuator assembly 100 has active adjustment and passive adjustment. Active adjustment refers to adjusting the height of the first damping device 10 to achieve height adjustment of the actuator assembly 100, and further enabling the distance between the wheel and the vehicle body to be increased or decreased, thereby realizing active vehicle body height adjustment. Passive adjustment means that during vehicle driving, the second damping device 20 can be coupled with the first damping device 10 to buffer road excitation and improve the comfort.

[0052] Among them, the first damping device 10 includes a fixed part 11 and a movable part 12 that are movably connected in a first direction, and the second damping device 20 includes a piston part 21 and a cavity part 22 that are movably connected in the first direction. The movable part 12 is connected to the piston rod 211 of the piston part 21, and one of the fixed part 11 and the cavity part 22 is adapted to be connected to the vehicle body, and the other is adapted to be connected to the axle or the wheel.

[0053] The first direction may be the height direction of the vehicle, or the first direction may have an angle with the height direction, but generally along the height direction. For example, the actuator assembly 100 is inclined, and the extension direction of the actuator assembly 100 (i.e., the first direction) has a 15° angle with the height direction.

[0054] Specifically, the fixed part 11 and the movable part 12 are movably connected in the first direction to actively adjust the vehicle body height by adjusting the distance between the fixed part 11 and the movable part 12. The piston part 21 and the cavity part 22 are movably connected in the first direction, and the movable cooperation between the piston part 21 and the cavity part 22 can achieve passive buffering of road surface excitation and can be coupled with the first damping device 10 to effectively buffer road surface excitation.

[0055] Furthermore, the piston part 21 is connected to the movable part 12, and in the second damping device 20, the damping force generated when the piston part 21 moves relative to the wall part 22 absorbs the road surface excitation received by the wheel.

[0056] Among them, the second damping device 20 can absorb high-frequency damping and buffer high-frequency vibrations, while damping of other frequencies can be absorbed by the first damping device 10. Thus, the second damping device 20 can make up for the shortcoming of the insufficient bandwidth of the first damping device 10, that is, by absorbing the high-frequency band damping force (i.e., high-frequency damping) that the first damping device 10 cannot respond to, the response bandwidth of the actuator assembly 100 can be increased, and the comfort of the whole vehicle can be improved.

[0057] It should be noted that the first damping device 10 and the second damping device 20 can achieve coupled vibration filtering, rather than fixedly, all high-frequency excitations are filtered by the first damping device 10, and all low-frequency excitations are filtered by the second damping device 20. In the actual working process, the first damping device 10 has the shortcoming of insufficient bandwidth. After it filters and suppresses a part of the road surface excitation, the second damping device 20 can further filter and suppress all or part of the remaining road surface excitation. The vibration filtering processes of the first damping device 10 and the second damping device 20 can be carried out simultaneously or successively, and can be dynamically coupled for vibration filtering based on the current damping state, road surface feedback state, etc. of the first damping device 10 and the second damping device 20.

[0058] Exemplarily, after the first damping device 10 of the embodiment of the present application completes the vehicle body height adjustment, during the passive adjustment process, it can have a first actuation mode and a second actuation mode. In the first actuation mode, the damping force generated by the second damping device 20 and the damping force generated by the first damping device 10 are coupled and used to suppress vehicle body vibration.

[0059] It can be understood that in the first actuation mode, during the driving process of the vehicle, when the wheels are subjected to road surface excitation, since the first damping device 10 and the second damping device 20 are connected in series, both the first damping device 10 and the second damping device 20 can be used to absorb the road surface excitation, thereby improving the corresponding bandwidth of the actuator assembly 100 and enhancing the high-frequency vibration comfort of the entire vehicle.

[0060] Specifically, in the first actuation mode, the road surface excitation is transmitted to the second damping device 20, causing relative movement between the cavity portion 22 and the piston portion 21 of the second damping device 20, thereby causing the second damping device 20 to generate a damping force to absorb the high-frequency excitation of the road surface and relieve the high-frequency vibration of the vehicle body; the remaining road surface excitation is transmitted to the first damping device 10 through the piston rod 211. At this time, the first damping device 10 is not energized, and the reverse torque generated by the first damping device 10 itself is used to suppress at least part of the remaining road surface excitation.

[0061] It should be noted that the reverse torque generated by the first damping device 10 itself here can be generated by the moment of inertia brought by the vehicle body weight, or can be generated by the electromagnetic damping force between the stator and the rotor of the power source in the first damping device 10 itself.

[0062] For example, when the entire vehicle encounters road surfaces such as asphalt and small stones, due to the response hysteresis of the first damping device 10, it is not sufficient to quickly provide damping force for effective buffering. At this time, the second damping device 20 can filter out high-frequency and low-amplitude vibrations by generating hydraulic damping force through oil fluid exchange. If the first damping device 10 is not in the locked state at this time, the second damping device 20 can compensate for the response time of the first damping device 10, so that the first damping device 10 can better respond to road surface excitations of other frequencies.

[0063] In the second actuation mode, when the pre-scanning system of the vehicle detects undulations on the road surface ahead, the first damping device actively intervenes and drives the movable portion 12 to move, realizing real-time control of the wheel height to meet the real-time demand of the vehicle for vehicle body height adjustment.

[0064] Specifically, based on the previewed road surface undulations, the bump amplitude of the wheel is determined. The greater the bump amplitude, the greater the movement amplitude of the movable part 12 relative to the fixed part 11, and the smaller the bump amplitude, the smaller the movement amplitude of the movable part 12 relative to the fixed part 11. That is, when the vibration generated by the wheel is transmitted to the movable part 12, the motor in the fixed part 11 is energized to generate a damping force that suppresses the vehicle body vibration, and the magnitude of the damping force generated by the fixed part 11 can be adjusted based on the bump amplitude to dynamically suppress the vehicle body vibration and improve comfort.

[0065] Meanwhile, it should be noted that when the fixed part 11 drives the movable part 12 to move in the first direction, the road surface excitation can be suppressed to achieve active tuning control of the vibration (i.e., the second actuation mode). When the vehicle body height is too low, the suspension system can also be prevented from hitting. Since the first damping device 10 and the second damping device 20 are arranged in series in the first direction, the second damping device 20 will generate a movement in the first direction, and the acting direction of the damping force generated by the second damping device 20 is opposite to that of the damping force generated by the first damping device 10. When performing active tuning control, the first damping device 10 needs to overcome the damping force generated by the second damping device 20 at the same time to achieve active tuning control.

[0066] That is to say, the cavity part 22 has a working cavity, and the working cavity has an inner cavity a and an outer cavity b that communicate with each other. The piston part 21 is movably arranged in the inner cavity a driven by the piston rod 211. Both the inner cavity a and the outer cavity b are filled with a pressure medium. The piston part 21 moves in the inner cavity a and changes the volume of the inner cavity a through its movement in the inner cavity a. Since the inner cavity a communicates with the outer cavity b, a throttling effect is generated between the inner cavity a and the outer cavity b, and the throttling effect can provide a damping force for the compression and extension movements of the second damping device 20 to achieve high-frequency vibration buffering, so as to filter the road surface excitation through the second damping device 20 and improve comfort.

[0067] However, during the working process of the second damping device 20, it is necessary to charge and discharge the working cavity (charge or release the pressure medium, and the pressure medium can be gas or liquid) and perform real-time working pressure detection. Since the second damping device 20 and the first damping device 10 are arranged in sequence in the first direction and are serially coupled, the charging and discharging device cannot directly contact the contact gap around the working area of the piston rod 211, resulting in greater difficulty in charging and discharging the charging and discharging device and greater difficulty in real-time detection of the working cavity pressure.

[0068] Based on this, see Figure 4 and Figure 5As shown, the present application further provides a nozzle support 22212 on the cavity part 22. The nozzle support 22212 is in communication with the outer cavity b, so that the charging and discharging device can be adapted to charge and discharge the outer cavity b through the nozzle support 22212, thereby realizing the adjustment of the working pressure of the working cavity, reducing the difficulty of charging and discharging, and at the same time, real-time pressure detection can be realized through the nozzle support 22212. For example, the nozzle support 22212 is connected to the nozzle of the charging and discharging device, and a pressure detection device can be further provided on the nozzle or directly on the nozzle support 22212 to realize real-time pressure detection of the working cavity.

[0069] It can be understood that the second damping device 20 of the embodiment of the present application can be a double-tube damper, a single-tube damper or a magnetorheological damper.

[0070] As described above, the second damping device 20 of the embodiment of the present application can be configured as a double-tube damper, so that the second damping device 20 has better damping effect and stability, and enables the second damping device 20 to better adapt to different working conditions and use environments, thereby providing higher safety performance.

[0071] Of course, in some other embodiments, the second damping device 20 can also be a single-tube damper or a magnetorheological damper.

[0072] Among them, when the second damping device 20 is a single-tube damper, the second damping device 20 has the advantages of economy, easy maintenance and long stroke; when the second damping device 20 is a magnetorheological damper, the second damping device 20 can have the advantages of intelligent controllability, low energy consumption, fast response, easy integration and compact structure.

[0073] According to the actuator assembly 100 of the embodiment of the present application, by providing a nozzle support 22212 on the cavity part 22, the nozzle of the charging and discharging device can be directly connected to the nozzle support 22212 to realize the charging and discharging operation of the working cavity, reduce the difficulty of the charging and discharging operation, and the nozzle support 22212 can also be used for real-time pressure detection at the same time, which can also reduce the difficulty of pressure detection, reduce the difficulty of charging and discharging and pressure detection of the working cavity, and improve the operation convenience.

[0074] It can be understood that the movable shell 121 can be configured as a split shell or an integral shell.

[0075] Combined with Figure 2 and Figure 3As shown, according to some embodiments of the present application, the cavity portion 22 includes a connected first connection shell 221 and a second connection shell 222. A working cavity is defined between the first connection shell 221 and the second connection shell 222. The first connection shell 221 is movably connected to the movable portion 12. The second connection shell 222 includes a first cylinder 2221 and a second cylinder 2222. The first cylinder 2221 and the second cylinder 2222 are spaced apart in the radial direction to divide the working cavity into an inner cavity a and an outer cavity b. The nozzle support 22212 is formed on the first cylinder 2221.

[0076] Specifically, both the first connection shell 221 and the second connection shell 222 can be configured as hollow shells, and their ends in the first direction are connected to define the working cavity. Alternatively, one of the first connection shell 221 and the second connection shell 222 can be configured as a hollow shell, and the other can be configured as a cover plate structure. The cover plate covers one end of the hollow shell and defines the working cavity. A pressure medium (such as hydraulic oil, pressurized gas, etc.) can be accommodated in the working cavity. The nozzle support 22212 is formed on the first cylinder 2221. The first cylinder 2221 and the second cylinder 2222 are spaced apart in the radial direction, and the first cylinder 2221 is located on the outer side in the radial direction, that is, the nozzle support 22212 is located on the outer surface of the second connection shell 2221, and the nozzle support 22212 is not provided on the first connection shell 221 adjacent to the first damping device 10. This makes the setting position of the nozzle support 22212 more reasonable, the connection between the nozzle support 22212 and the charging / discharging device and the pressure detection device (such as a pressure sensor) simpler and more convenient, the charging / discharging operation and real-time pressure detection more convenient, and being set far away from the first damping device 10 can reduce the probability of interference and improve the working stability and reliability of the actuator assembly 100.

[0077] Furthermore, the piston portion 21 further includes a piston assembly 212. The piston assembly 212 is connected to the piston rod 211. The cavity portion 22 includes a connected first connection shell 221 and a second connection shell 222. The first connection shell 221 and the second connection shell 222 define the working cavity. The first connection shell 221 is movably connected to the movable shell 121. The piston rod 211 passes through the first connection shell 221. The piston assembly 212 is located in the working cavity, and the cavity portion 22 is adapted to move relative to the piston assembly 212 under the action of the pressure medium.

[0078] That is to say, the piston assembly 212 is connected to the piston rod 211 and extends into the working cavity. Thus, under the action of the pressure difference of the pressure medium, the first connection shell 221 and the second connection shell 222 can move synchronously relative to the piston assembly 212 to realize the extension and compression of the second damping device 20.

[0079] Among them, the second cylinder body 2222, the first connecting shell 221, and the piston assembly 212 divide the inner cavity a into a first sub-cavity a1 and a second sub-cavity a2 that communicate with each other, and the piston rod 211 is located in the first sub-cavity a1.

[0080] Specifically, the piston rod 211 extends into the first sub-cavity a1, and the piston rod 211 is connected to the piston assembly 212, resulting in the piston rod 211 occupying the space of the first sub-cavity a1. The road surface excitation is first transmitted from the wheel or axle to the second damping device 20 for attenuation. At this time, the first connecting shell 221 and the second connecting shell 222 move reciprocally relative to the piston rod 211 synchronously. During the compression stroke, the wheel approaches the vehicle frame, the second damping device 20 is compressed, and the piston assembly 212 moves downward. The volume of the second sub-cavity a2 decreases, the pressure of the pressure medium rises, and the pressure medium flows into the first sub-cavity a1 through the piston assembly 212.

[0081] Furthermore, since the piston rod 211 in the first sub-cavity a1 occupies a part of the space of the first sub-cavity a1, the increased volume of the first sub-cavity a1 is smaller than the decreased volume of the second sub-cavity a2, and a part of the pressure medium will overflow into the outer cavity b; during the extension stroke, the wheel moves away from the vehicle frame relative to the vehicle frame, the second damping device 20 is stretched, and the piston assembly 212 moves upward. The volume of the first sub-cavity a1 decreases, the pressure of the pressure medium rises, and the pressure medium in the first sub-cavity a1 flows into the second sub-cavity a2 through the piston assembly 212. Due to the presence of the piston rod 211, the pressure medium in the first sub-cavity a1 cannot fill the increased volume of the second sub-cavity a2, and a certain vacuum degree will be generated in the second sub-cavity a2. At this time, the pressure medium in the outer cavity b replenishes the second sub-cavity a2.

[0082] That is to say, during the flow process of the pressure medium among the first sub-cavity a1, the second sub-cavity a2, and the outer cavity b, a throttling effect is generated, and the throttling effect can provide a damping force for the compression and extension movements of the second damping device 20, realizing high-frequency vibration buffering. The second damping device 20 filters the remaining road surface excitation, which can be further transmitted to the movable shell 121 through the piston rod 211, and then actuated through the first damping device 10 to dissipate the road surface excitation, and the vibration of the whole vehicle body is suppressed.

[0083] That is to say, the second damping device 20 and the first damping device 10 are mutually coupled to eliminate the road surface excitation. The addition of the second damping device 20 enables the second damping device 20 and the first damping device 10 to cooperate with each other and work independently, realizing the stability of the vehicle's handling and the comfort of driving.

[0084] Meanwhile, the bandwidth of the first damping device 10 is insufficient to quickly provide damping force for effective buffering. At this time, the second damping device 20 can generate damping force through throttling to buffer, filter out high-frequency and low-amplitude vibrations, compensate for the response time of the first damping device 10, and make up for the shortage of bandwidth, thereby improving the comfort of the whole vehicle when encountering road surfaces such as asphalt and small stones.

[0085] In this way, the piston rod 211 passes through the first connection shell 221 so that the piston assembly 212 is located in the working cavity. On the premise that the second damping device 20 and the first damping device 10 are connected in series coaxially and coupled with each other to offset road surface excitation, the first connection shell 221 and the movable shell 121 can at least partially overlap. The movable connection with the movable shell 121 is realized through the first connection shell 221 externally, and the movable connection is realized through the piston assembly 212 internally, which can improve the cooperation stability and reliability between the second damping device 20 and the first damping device 10, and further make the layout of the actuator assembly 100 more compact.

[0086] It can be understood that a threaded structure, a plug-in structure, etc. can be provided at the free end of the piston rod 211 (i.e., the end away from the movable shell 121), and the piston assembly 212 can be fixed on the piston rod 211 through a threaded structure, a plug-in structure, etc. to define the piston portion 21. The piston assembly 212 is in sealing and sliding fit with the side wall of the working cavity, that is, the cavity portion 22 is sleeved outside the piston assembly 212, and a sliding sealing ring can be provided between the two to enable the first connection shell 221 and the second connection shell 222 to slide relative to the piston assembly 212.

[0087] As Figure 3 shown, according to some embodiments of the present application, the first connection shell 221 includes: a first flange 2211 and a first sleeve 2212 located on the side of the first flange 2211 facing the first damping device 10. The first flange 2211 is connected to the second connection shell 222, the first sleeve 2212 is sleeved on the movable shell 121, the second flange 2213 is opposite to the first flange 2211 in the first direction, and the first sleeve 2212 is located between the first flange 2211 and the second flange 2213.

[0088] That is to say, the first connection shell 221 includes a first flange 2211, a second flange 2213 oppositely arranged with the first flange 2211 in the first direction, and a first sleeve 2212 located between the first flange 2211 and the second flange 2213. The second flange 2213 is connected to the second connection shell 222, and the first sleeve 2212 is sleeved on the movable shell 121.

[0089] Specifically, through holes are provided on both the first flange 2211 and the second flange 2213. The piston rod 211 passes through the through holes and extends into the working chamber, and is connected to the piston assembly 212 located in the working chamber. The first flange 2211 is used to connect to the second connection housing 222, which can improve the structural strength, connection stability, and reliability of the cavity portion 22. The first sleeve 2212 is sleeved on the outer periphery of the movable housing 121. The length of the first sleeve 2212 can be consistent with the movement stroke of the second damping device 20, or can be slightly greater than the movement stroke of the second damping device 20, and the movement of the movable housing 121 can be guided through the first sleeve 2212.

[0090] Thus, by setting the first flange 2211 to be connected to the second connection housing 222, the structural strength of the second damping device 20 can be improved. The first sleeve 2212 is sleeved on the outside of the movable housing 121, which can realize the radial limit of the movable housing 121 and improve the coaxiality between the movable housing 121 and the working chamber of the second damping device 20, so as to improve the coupling effect between the second damping device 20 and the first damping device 10, effectively buffer the road surface excitation while reducing the radial crosstalk, and also improve the working stability and reliability of the actuator assembly 100.

[0091] At the same time, the second flange 2213 can realize the pushing and limiting of the movable housing 121 in the first direction, so as to prevent the piston rod 211 from hitting the valve body structure inside the cavity portion 22 (i.e., the valve body components in the inner cavity a and the outer cavity b) after moving to the limit stroke, improve the working safety of the actuator assembly 100, reduce potential safety hazards, and reduce the probability of the actuator assembly 100 failing. The second flange 2213 can also serve as a barrier between the air nozzle support 22212 and the first damping device 10, reducing the probability of interference and entanglement between the pipeline structure in the area where the air nozzle support 2212 is located and the first damping device 10 during the working process of the first damping device 10, and improving the safety and reliability of the actuator assembly 100.

[0092] It can be understood that mounting holes can be evenly distributed on the second flange 2213. The thickness, shape, and dimensions in the first direction of the first flange 2211 and the second flange 2213 can be changed according to requirements, and the number of mounting holes can also be changed according to requirements. The fit between the first sleeve 2212 and the movable housing 121 is a sliding fit, which can also realize the movement guidance of the piston rod 211 connected to the movable housing 121, improve the action smoothness of the second damping device 20, and improve the reliability and safety of the actuator assembly 100.

[0093] As Figure 3 shown, according to some embodiments of the present application, the first sleeve 2212 and the movable housing 121 are spaced apart radially, and a sliding bearing 30 is provided between the two.

[0094] Specifically, the inner wall of the first sleeve 2212 is radially spaced apart from the side wall of the movable housing 121, and a guiding inclined surface may be provided at one end of the first sleeve 2212 away from the second flange 2213 to install the sliding bearing 30 between the first sleeve 2212 and the movable housing 121. That is, the sliding bearing 30 is configured as a cylindrical bearing, which can improve the coaxiality of the first damping device 10 and the second damping device 20, realize the movement guiding of the first connecting housing 221, improve the movement smoothness. At the same time, the sliding bearing 30 is assembled from one end of the first sleeve 2212 away from the second flange 2213, and this end is configured as an open end (that is, the inner diameter of the first flange 2211 is greater than or equal to the inner diameter of the second flange 2213, and the inner diameter of the first flange 2211 is greater than the outer diameter of the movable housing 121 to form an assembly gap). As a guiding member, the sliding bearing 30 is assembled from the open end, which can simplify the disassembly and assembly process, reduce the disassembly and assembly difficulty, facilitate later maintenance and servicing, and can reduce the maintenance and servicing costs.

[0095] In addition, it should be noted that a clearance fit may be provided between the sliding bearing 30 and the movable housing 121. The outer peripheral surface of the movable housing 121 should have a low roughness (such as 0.63um), and the surface of the sliding bearing 30 opposite to the movable housing 121 should also have a low roughness, so that the friction force between the movable housing 121 and the sliding bearing 30 is minimized, reducing the frictional loss, prolonging the service life, improving the frictional noise, and enhancing the use experience. The outer surface of the sliding bearing 30 should have a large roughness (such as 1.6um) and can be in interference fit with the inner wall surface of the first sleeve 2212 to fix the sliding bearing 30 and keep the sliding bearing 30 relatively stationary with respect to the first connecting housing 221.

[0096] As Figure 3 shown, according to some embodiments of the present application, a third flange 22211 is provided at one end of the first cylinder 2221 facing the first connecting housing 221, and the third flange 22211 is connected to the second flange 2213 of the first connecting housing 221.

[0097] That is to say, the second flange 2213 is connected to the third flange 22211 to realize the connection between the first connecting housing 221 and the second connecting housing 222, which can improve the structural strength and stability of the cavity part 22 and make the working stability of the second damping device 20 higher.

[0098] At the same time, the first flange 2211 and the second flange 2213 are provided on the first connecting housing 221 of the second damping device 20, and the third flange 22211 is provided on the second connecting housing 222, which can make the overall structural strength of the second damping device 20 higher, the impact resistance better, and the service life longer.

[0099] According to some embodiments of the present application, the second damping device 20 further includes: a cage 23, which is disposed between the first cylinder 2221 and the second cylinder 2222 and is adapted to fix the second cylinder 2222.

[0100] Specifically, an outer cavity b is defined between the first cylinder 2221 and the second cylinder 2222. The cage 23 is disposed in the outer cavity b and is located at the same-side end of the first cylinder 2221 and the second cylinder 2222. The cage 23 is connected to both the first cylinder 2221 and the second cylinder 2222 simultaneously, achieving the sealing of the working cavity, and at the same time, the limitation between the first cylinder 2221 and the second cylinder 2222 can be realized to maintain the coaxiality of the first cylinder 2221 and the second cylinder 2222, thereby improving the working stability of the second damping device 20.

[0101] As Figure 3 shown, according to some embodiments of the present application, a buffer member 2123 is further disposed on the side of the piston body 2121 facing the first damping device 10.

[0102] Specifically, the buffer member 2123 can be made of materials such as polyurethane and rubber. When the second damping device 20 moves towards the stretching stroke stop point, it can provide buffer protection for the piston assembly 212, reduce the abnormal noise during the operation of the second damping device 20, and extend the working life of the piston assembly 212, so as to extend the working life and service cycle of the actuator assembly 100 and reduce costs.

[0103] According to some embodiments of the present application, the piston assembly 212 includes a piston body 2121 and a first valve 2122 disposed on the piston body 2121. The piston body 2121 is connected to the piston rod 211. The first valve 2122 is adapted to communicate the first sub-cavity a1 with the second sub-cavity a2 under the action of pressure. A second valve 22221 is further disposed at the end of the second cylinder 2222 away from the first damping device 10. The second valve 22221 is adapted to communicate the second sub-cavity a2 with the outer cavity b under the action of pressure to supply pressure medium to the second sub-cavity a2 or extract the pressure medium in the second sub-cavity a2.

[0104] Specifically, the first valve 2122 is configured as a valve body or a valve system that can communicate the first sub-cavity a1 and the second sub-cavity a2. The second valve 22221 is configured as a valve body or a valve system that can communicate the second sub-cavity a2 with the outer cavity b. The second valve 22221 can be disposed on the second cylinder 2222, and the first valve 2122 can be disposed on the piston body 2121.

[0105] Exemplarily, a two-way channel can be provided inside the second valve 22221 and cooperate with a two-way valve plate to achieve selectable communication between the first sub-chamber a1 and the second sub-chamber a2. A compression channel and a restoration channel can be provided inside the second valve 22221, and a compression valve plate can be provided corresponding to the compression channel, and a restoration valve plate can be provided corresponding to the restoration channel to communicate the second sub-chamber a2 with the outer chamber b during the compression stroke and the extension stroke respectively.

[0106] Thus, damping force can be generated through the throttling effects of the first valve 2122 and the second valve 22221 to effectively buffer road surface excitations and improve comfort.

[0107] As Figure 2 shown, according to some embodiments of the present application, the fixing part 11 includes a fixing shell 111, a power source 112 and a transmission group 113. The power source 112 is arranged inside the fixing shell 111. The fixing shell 111 is movably connected to the movable shell 121. The transmission group 113 includes a power input end 1131 and a power output end 1132. The power input end 1131 is power-connected to the power source 112, and the power output end 1132 is arranged on the movable shell 121 and is power-connected to the power output end 1132.

[0108] Specifically, a frameless motor can be selected as the motor, the rotor is on the inner side in the axial direction, and threaded holes can be provided on the cage 23. The transmission group 113 can be configured as a ball screw transmission part. The screw shaft is coaxially nested with the rotor, that is, the end of the screw shaft is power-connected to the rotor through a spline structure to form a power output end 1132. A spiral rolling groove for the balls to roll can be provided on the screw shaft, and the ball nut meshes with the screw shaft, and the balls are arranged between the ball nut and the screw shaft. The ball nut forms a power output end 1132. The fixing shell 111 and the movable shell 121 are configured as a nested structure, and the ball nut is fixed to the movable shell 121, so as to drive the transmission group 113 through the power source 112, the transmission group 113 drives the movable shell 121, and the movable shell 121 moves up and down relative to the fixing shell 111 to realize the height adjustment of the actuator assembly 100.

[0109] Of course, the structure of the transmission group 131 in the embodiments of the present application is not limited to this. In some other embodiments, the transmission group 131 can be configured as a gear-rack transmission part. The gear is connected to the power source 112 and is configured as a power output end 1131, and the rack is connected to the first shell 121 and is configured as a power output end 1132.

[0110] As Figure 2 shown, the fixing shell 111 includes: a motor shell 1111 and a guiding shell 1112. The power source 112 is arranged in the motor shell 1111. One end of the guiding shell 1112 is connected to the motor shell 1111, and the other end forms an open mouth. At least part of the first shell 121 is movably arranged in the guiding shell 1112 via the open mouth.

[0111] Specifically, the guiding housing 1112 includes a first housing segment 11121, a second housing segment 11122, and a third housing segment 11123 that are sequentially connected in the first direction and have sequentially decreasing outer diameters. The first housing segment 11121 is connected to the motor housing 1111 through a flange. The second housing segment 11122 is adapted to accommodate the transmission group 113 and is used to limit the stroke of the transmission group 113. The third housing segment 11123 is sleeved on the first housing 121 and is adapted to provide motion guidance for the first housing 121.

[0112] That is to say, one end of the first housing segment 11121 in the first direction can form a flange and is connected to the motor housing 1111 through the flange to improve the fixing stability and reliability of the power source 111. The other end of the first housing segment 11121 can form an annular disc structure. The annular disc structure is connected to one end of the second housing segment 11122. The other end of the second housing segment 11122 is connected to the third housing segment 11123 through another annular disc structure. And this annular disc structure can be used to limit the stroke of the power output end 1132 of the transmission group 113, improve the working stability of the transmission group 113, and the third housing segment 11123 realizes the motion guidance of the first housing 121, improves the motion smoothness of the first damping device 10, and improves the working stability of the actuator assembly 100.

[0113] It should be noted that the inner diameter of the third housing segment 11123 can be slightly larger than or equal to the outer diameter of the first housing 121 to realize the motion guidance of the first housing 121 and reduce the radial runout of the first housing 121.

[0114] As Figure 1 shown, according to some embodiments of the present application, it further includes a lower control arm 40. The lower control arm 40 is connected to the first cylinder 2221, or the first cylinder 2221 is integrally formed with the lower control arm 40.

[0115] That is to say, in some embodiments, the lower control arm 40 is fixedly connected to the first cylinder 2221. In other embodiments, the two are integrally formed. The lower control arm 40 is used to connect a wheel or an axle, and the lower control arm 40 is directly connected to the second damping device 20, which can also further simplify the structure of the actuator assembly 100, reduce the cost of the actuator assembly 100, and improve the space occupation of the actuator assembly 100.

[0116] Next, the working process of the actuator assembly 100 according to the embodiments of the present application will be specifically described:

[0117] In the working condition where the first damping device 10 performs active control, as Figure 2As shown, the motor rotates and transmits power to the power input end 1131. The power input end 1131 rotates, driving the power output end 1132 to perform a linear motion. The power output end 1132 is fixedly connected to the movable housing 121, thereby directly driving the movable housing 121 to move. The movable housing 121 moves towards or away from the fixed housing 111 to achieve the height adjustment of the suspension.

[0118] When the actuator assembly 100 is in the first actuation mode, the road surface excitation is transmitted from the wheel to the lower control arm 40, and then to the cavity portion 22 of the second damping device 20. A relative motion is generated between the cavity portion 22 and the piston assembly 212. The first valve 2122 and the second valve 22221 can be selectively opened or closed under the action of pressure or electronically controlled. The volumes of the first sub-chamber a1 and the second sub-chamber a2 change. At the same time, the outer chamber b can supplement the pressure medium to the second sub-chamber a2 or accommodate the pressure medium discharged from the second sub-chamber a2, and generate a damping force to offset the high-frequency road surface excitation. At the same time, the piston assembly 212 is connected to the movable housing 121 through the piston rod 211. The movable housing 121 can further transmit the low-frequency road surface excitation and generate a tendency to rotate the power input end 1131. The motor suppresses the rotation of the power input end 1131 through its own electromagnetic damping force to absorb the low-frequency road surface excitation, thereby eliminating the excitation transmitted from different road surfaces to obtain a better driving experience. It should be noted that here the first damping device 10 is not energized. The reverse torque generated by the first damping device 10 itself can be generated by the moment of inertia brought by the vehicle body weight, or can be generated by the electromagnetic damping force between the stator and the rotor of the motor itself in the first damping device 10.

[0119] In the first actuation mode, the road surface excitation (which can include high-frequency excitation, at least part of the low-frequency excitation, etc.) is filtered by the second damping device 20, and at least part of the remaining excitation (such as low-frequency high-amplitude and low-frequency low-amplitude vibrations) can be further transmitted to the movable housing and the power output end 1132 through the piston rod 211. The power output end 1132 converts the linear motion into a rotational tendency of the lead screw shaft. The motor suppresses the rotational tendency of the power input end 1131 through the reverse torque generated by itself to achieve the purpose of dissipating the excitation energy.

[0120] For example, when the excitation is at a low frequency and low amplitude, both the first damping device 10 and the second damping device 20 may move. The second damping device 20 can be a soft damper (with relatively soft damping). After receiving the road surface excitation, relative movement occurs between the piston portion 21 and the cavity portion 22, canceling out the road surface excitation to achieve vibration filtering through the second damping device 20. If the second damping device 20 is a hard damper (with relatively hard damping), the second damping device 20 can be formed as a rigid body and push the movable portion 12 to move in the first direction towards the fixed portion 11 to achieve vibration filtering through the first damping device 10. When the amplitude of the road surface excitation is within the bearing range of the second damping device 20, the damping device with relatively softer damping between the first damping device 10 and the second damping device 20 will bear the road surface excitation. When both the first damping device 10 and the second damping device 20 reach their bearing limits, the road surface excitation will be transmitted to the vehicle body.

[0121] That is to say, the first damping device 10 and the second damping device 20 can achieve coupled vibration filtering, rather than fixedly filtering all high-frequency excitations by the first damping device 10 and all low-frequency excitations by the second damping device 20. Instead, it is based on the current damping states, road surface feedback states, etc. of the first damping device 10 and the second damping device 20 for dynamic coupled vibration filtering.

[0122] In the second actuation mode, when the wheel encounters bumps, the force exerted on the lower control arm 40 by the wheel is transmitted to the movable housing through the piston rod 211 of the second damping device 20. The movable housing pushes the power output end 1132, generating a rotational tendency of the power input end 1131. The motor is energized to generate a reverse torque that inhibits the rotation of the power input end 1131 to suppress the rotational tendency of the power input end 1131. However, the power input end 1131 can still rotate and ultimately achieve the purpose of suppressing vehicle body vibration. Among them, the control device of the actuator assembly 100 can be connected to the motor. The control device obtains the current rotation parameters of the motor and obtains the target rotation parameters based on the current rotation parameters. The control device then controls the motor to operate with the target rotation parameters to generate the target rotational torque to better suppress the rotational tendency of the power input end 1131, thereby achieving the effect of suppressing vehicle body vibration and ensuring smooth driving of the vehicle.

[0123] Among them, the greater the bumps received by the wheel, the greater the displacement change between the power input end 1131 and the power output end 1132, the faster the rotation speed of the motor, and the greater the electromagnetic rotational torque generated by the motor 1, which can suppress larger amplitude vibrations.

[0124] That is to say, in the second actuation mode, in cooperation with the vehicle preview system, active control of the actuator assembly 100 can be performed based on the undulation of the road surface ahead. By controlling the magnitude and direction of the motor current, road excitation can be suppressed, and active adjustment control of the actuator assembly 100 can be achieved. At the same time, according to the vehicle body height sensor, when the vehicle body height is too low, the motor output force can be controlled to adjust the suspension height and prevent the suspension from hitting.

[0125] Among them, when the motor is energized, since the second damping device 20 and the first damping device 10 are in series, the second damping device 20 will move up and down. The hydraulic oil in the first sub-chamber a1 and the second sub-chamber a2 flows through the first valve 2122 to generate a damping force. The damping force generated by the second damping device 20 is opposite to the active acting force of the first damping device 10. At this time, the first damping device 10 needs to overcome the damping force of the second damping device 20 to complete the above-mentioned active adjustment.

[0126] Other configurations and operations of the actuator assembly 100 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0127] An embodiment of the present application provides a suspension system, including: the actuator assembly 100 in the above embodiment.

[0128] An embodiment of the present application provides a vehicle, including: the suspension system in the above embodiment.

[0129] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0130] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. An actuator assembly (100), characterized in that: include: A first damping device (10), the first damping device (10) comprising a fixed portion (11) and a movable portion (12) movably connected in a first direction; A second damping device (20), the second damping device (20) comprising a piston portion (21) and a cavity portion (22) movably connected in the first direction, the movable portion (12) being connected to a piston rod (211) of the piston portion (21), and one of the fixed portion (11) and the movable portion (12) being suitable for being connected to a vehicle body, and the other being suitable for being connected to an axle or a wheel; in The cavity portion (22) has a working cavity, and the working cavity has an inner cavity (a) and an outer cavity (b) which are connected to each other. The piston portion (21) is movably arranged in the inner cavity (a). The cavity portion (22) is provided with a valve support (22212), and the valve support (22212) is connected to the outer cavity (b) and is suitable for realizing the filling and discharging of the outer cavity (b) through the valve support (22212).

2. The actuator assembly according to claim 1, characterized in that: The cavity portion (22) includes a first connecting shell (221) and a second connecting shell (222) connected to each other, the first connecting shell (221) and the second connecting shell (222) define a working chamber, the first connecting shell (221) is movably connected to the movable portion (12), the second connecting shell (222) includes a first cylinder (2221) and a second cylinder (2222), the first cylinder (2221) and the second cylinder (2222) are radially spaced apart to divide the working chamber into an inner chamber (a) and an outer chamber (b) that are connected to each other, and the air valve support (22212) is formed on the first cylinder (2221).

3. The actuator assembly according to claim 2, characterized in that: The piston portion (21) further comprises a piston assembly (212), wherein the piston assembly (212) is connected to the piston rod (211), the second cylinder (2222) and the first connecting shell (221), and the piston assembly (212) divide the inner cavity (a) into a first sub-cavity (a1) and a second sub-cavity (a2) which are connected to each other, the piston rod (211) is located in the first sub-cavity (a1), and the cavity portion (22) is suitable for moving relative to the piston assembly (212) under the action of a pressure medium.

4. The actuator assembly (100) according to claim 2, characterized in that: The first connecting shell (221) comprises a first flange (2211), and the first flange (2211) is connected to the second connecting shell (222).

5. The actuator assembly according to claim 4, characterized in that: The first connecting shell (221) further has a second flange (2213) opposite to the first flange (2211) in the first direction.

6. The actuator assembly (100) according to claim 2, characterized in that: A third flange (22211) is provided at one end of the first cylinder (2221) facing the first connecting shell (221), and the third flange (22211) is connected to the first connecting shell (221).

7. The actuator assembly (100) according to claim 2, characterized in that: The second damping device (20) further comprises: a retaining frame (23), wherein the retaining frame (23) is arranged between the first cylinder (2221) and the second cylinder (2222) and is suitable for fixing the second cylinder (2222).

8. The actuator assembly (100) according to claim 3, characterized in that: The piston assembly (212) comprises a piston body (2121) and a first valve (2122) arranged on the piston body (2121); the piston body (2121) is connected to the piston rod (211); and the first valve (2122) is suitable for connecting the first sub-chamber (a1) with the second sub-chamber (a2) under the action of pressure.

9. The actuator assembly (100) according to claim 8, characterized in that: A buffer member (2123) is also provided on the side of the piston body (2121) facing the first damping device (10).

10. The actuator assembly (100) according to claim 3, characterized in that: A second valve (22221) is also provided at one end of the second cylinder (2222) away from the first damping device (10), and the second valve (22221) is suitable for connecting the second sub-chamber (a2) with the outer chamber (b) under the action of pressure to supply pressure medium to the second sub-chamber (a2) or extracting pressure medium from the second sub-chamber (a2).

11. The actuator assembly (100) according to claim 1, characterized in that: The fixed part (11) comprises a fixed shell (111), a power source (112) and a transmission group (113); the power source (112) is arranged in the fixed shell (111); the fixed shell (111) is movably connected to a movable shell (121) of the movable part (12); the transmission group (113) comprises a power input end (1131) and a power output end (1132); the power input end (1131) is motively connected to the power source (112); the power output end (1132) is arranged on the movable shell (121) and motively connected to the power output end (1132) to drive the movable shell (121) to move relative to the fixed shell (111).

12. The actuator assembly (100) according to claim 11, characterized in that: The transmission group (113) is constructed as a ball screw transmission part or a gear rack transmission part.

13. The actuator assembly (100) according to claim 11, characterized in that: The fixed shell (111) comprises: a motor shell (1111) and a guide shell (1112); the power source (112) is arranged in the motor shell (1111); one end of the guide shell (1112) is connected to the motor shell (1111); the other end of the guide shell (1112) is formed with an open opening; at least a portion of the movable shell (121) is relatively movably arranged in the guide shell (1112) via the open opening.

14. The actuator assembly (100) according to claim 13, characterized in that: The guide shell (1112) comprises a first shell segment (11121), a second shell segment (11122) and a third shell segment (11123) which are sequentially connected in the first direction; the first shell segment (11121) is connected to the motor shell (1111) via a flange; the second shell segment (11122) is suitable for accommodating the transmission group (113) and for limiting the travel of the transmission group (113); the third shell segment (11123) is sleeved on the movable shell (121) and is suitable for providing movement guidance for the movable shell (121).

15. The actuator assembly (100) according to claim 2, characterized in that: It also includes a lower fork arm (40), wherein the lower fork arm (40) is connected to the first cylinder (2221), or the first cylinder (2221) and the lower fork arm (40) are integrally formed.

16. A suspension system, characterized in that: include: The actuator assembly (100) according to any one of claims 1 to 15.

17. A vehicle, characterized in that: include: The suspension system of claim 16.

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