Electromagnetic drive assembly and functional seat

Abstract

The utility model provides a kind of electromagnetic drive assembly and functional seat, wherein, electromagnetic drive assembly, comprising: support piece, support piece includes cylinder, first baffle ring and second baffle ring, first baffle ring and second baffle ring are set in the outer cylinder and interval arrangement, cylinder, first baffle ring and second baffle ring are integrally formed structure;Electromagnetic coil, around the outside of cylinder, and electromagnetic coil is located between first baffle ring and second baffle ring;Telescopic shaft, telescopically be set in cylinder, electromagnetic coil energization to drive telescopic shaft telescopic;Guide piece, between cylinder and telescopic shaft, guide piece and telescopic shaft guide cooperation.The technical scheme of the application effectively solves the problem that the assembly step of the driving system of functional seat in the related art is complex.

Description

Technical Field

[0001] This utility model relates to the field of smart home technology, and more specifically, to an electromagnetic drive component and a functional seat. Background Technology

[0002] As people pursue a healthier and more comfortable lifestyle, functional seating (such as rocking chairs, massage chairs, and car seats) is becoming increasingly popular because it offers additional health benefits and a relaxing experience.

[0003] The functional seat in the related technology includes a base, a seat body, and a drive system. The seat body is swayably mounted on the base, and the drive system is mounted on the base and used to drive the seat body to sway. As one of the core components of the functional seat, the drive system enables the functional seat to rock or sway according to the user's needs and preferences, thereby enhancing the versatility and comfort of the functional seat.

[0004] However, the drive system in related technologies consists of multiple independent components, such as a cylinder, a telescopic component retractably disposed within the cylinder, an electromagnetic coil sleeved outside the cylinder, multiple positioning structures for fixing the electromagnetic coil, and multiple fasteners for fixing the positioning structures. These components need to be manufactured separately and then precisely aligned and fixed during assembly, increasing the complexity and time required for assembling the drive system. This makes the assembly process for the drive system of the functional seat quite complex. Utility Model Content

[0005] The main objective of this invention is to provide an electromagnetic drive assembly and a functional seat to solve the problem of complex assembly steps in the drive system of functional seats in related technologies.

[0006] To achieve the above objectives, according to one aspect of the present invention, an electromagnetic drive assembly is provided, comprising: a support member including a cylindrical body, a first retaining ring, and a second retaining ring, the first and second retaining rings being sleeved on the outside of the cylindrical body and spaced apart, the cylindrical body, the first retaining ring, and the second retaining ring being an integrally formed structure; an electromagnetic coil wound around the outside of the cylindrical body, the electromagnetic coil being located between the first and second retaining rings; a telescopic shaft retractably disposed within the cylindrical body, the electromagnetic coil being energized to drive the telescopic shaft to extend or retract; and a guide member disposed between the cylindrical body and the telescopic shaft, the guide member being guided and engaged with the telescopic shaft.

[0007] Furthermore, the guide component includes a guide rib, which is disposed on the inner wall of the cylinder and contacts and engages with the telescopic shaft.

[0008] Furthermore, the guide ribs extend along the axial direction of the cylinder, and there are multiple guide ribs, which are spaced apart along the circumference of the cylinder.

[0009] Furthermore, the guide component also includes a bearing, which is installed inside the cylinder. The telescopic shaft passes through the bearing, and the bearing and the guide rib are arranged adjacent to each other along the axial direction of the cylinder.

[0010] Furthermore, the bearing is an oil-impregnated bushing. In the projection plane perpendicular to the axis of the cylinder, the apexes of multiple guide ribs are located inside the trajectory circle, and the diameter of the trajectory circle is greater than or equal to the inner diameter of the oil-impregnated bushing.

[0011] Furthermore, the bearing is an oil-impregnated bushing, which extends along the axial direction of the cylinder to have a bushing length L. The inner diameter of the oil-impregnated bushing is D, satisfying: 0.5≤L / D≤2.0.

[0012] Furthermore, the guide component includes a bearing, which is housed within the cylinder, and the telescopic shaft passes through the bearing.

[0013] Furthermore, the bearing is an oil-impregnated bushing, or the bearing is a linear bearing.

[0014] Furthermore, the support also includes a first leg and a second leg respectively disposed at both ends of the cylinder, the first leg being connected to the first retaining ring, and the cylinder, the first retaining ring, the second retaining ring, the first leg and the second leg being an integrally formed structure; and / or, the electromagnetic drive assembly also includes a base, and the support is disposed on the base.

[0015] According to another aspect of the present invention, a functional seat is provided, including a base, a seat body, and an electromagnetic drive assembly. The electromagnetic drive assembly is the aforementioned electromagnetic drive assembly, which is disposed on the base. The seat body is swayably disposed on the base, and one end of a telescopic shaft is connected to the seat body. The telescopic shaft extends and retracts to drive the seat body to sway.

[0016] The electromagnetic drive assembly, utilizing the technical solution of this utility model, includes a support member, an electromagnetic coil, a telescopic shaft, and a guide rod. The support member includes a cylindrical body, a first retaining ring, and a second retaining ring. The first and second retaining rings are sleeved on the outside of the cylindrical body and spaced apart, forming a single integral structure. The electromagnetic coil is wound around the outside of the cylindrical body, positioned between the first and second retaining rings. The telescopic shaft is telescopically mounted inside the cylindrical body, and the electromagnetic coil is energized to drive the telescopic shaft to extend or retract. The guide member is positioned between the cylindrical body and the telescopic shaft, providing a guiding fit. Thus, the first and second retaining rings define the winding position of the electromagnetic coil, making its position outside the cylindrical body more accurate, thereby facilitating the electromagnetic coil's driving operation of the telescopic shaft. The cylinder, first retaining ring, and second retaining ring are integrally molded, allowing their positions relative to the cylinder to be fixed during production. This ensures more precise positioning of the first and second retaining rings relative to the cylinder, eliminating the need for positioning and fixing operations on the cylinder and simplifying the assembly process of the electromagnetic drive assembly. This integrated design simplifies the assembly process of the electromagnetic drive assembly, reduces the number of independent parts, and thus reduces the need for precise alignment and fixing during assembly, significantly shortening assembly time and reducing assembly steps. The integral molded structure not only ensures the structural stability of the electromagnetic drive assembly but also eliminates alignment errors that may be introduced by multi-part assembly in related technologies, improving the overall performance of the electromagnetic drive assembly. The guide component allows the telescopic shaft to extend and retract more smoothly along the preset direction, improving the driving stability of the electromagnetic drive assembly. Therefore, the technical solution of this application effectively solves the problem of complex assembly steps in the drive system of functional seats in related technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the electromagnetic drive assembly according to the present invention is shown, wherein the guide member includes a guide rib.

[0019] Figure 2 It shows Figure 1 A cross-sectional schematic diagram of the electromagnetic drive assembly along the axis perpendicular to the cylinder.

[0020] Figure 3 It shows Figure 1 A cross-sectional schematic diagram of the electromagnetic drive assembly along the axis parallel to the cylinder.

[0021] Figure 4 A three-dimensional structural schematic diagram of an embodiment in which the guide of the electromagnetic drive assembly includes guide ribs and linear bearings is shown.

[0022] Figure 5 It shows Figure 4 A cross-sectional schematic diagram of the electromagnetic drive assembly along the axis parallel to the cylinder.

[0023] Figure 6 A three-dimensional structural schematic diagram of an embodiment of an electromagnetic drive assembly is shown, in which the guide member includes a guide rib and an oil-filled bushing.

[0024] Figure 7 It shows Figure 6 A cross-sectional view of the electromagnetic drive assembly along the axis parallel to the cylinder.

[0025] The above figures include the following reference numerals:

[0026] 11. Cylinder body; 12. First retaining ring; 13. Second retaining ring; 14. First support leg; 15. Second support leg;

[0027] 20. Electromagnetic coil;

[0028] 30. Telescopic shaft;

[0029] 41. Guide rib; 411. Track circle; 42. Oil-impregnated bushing; 43. Linear bearing;

[0030] 50. Base. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0034] In this embodiment, the electromagnetic drive assembly includes a support member, an electromagnetic coil 20, a telescopic shaft 30, and a guide rod. The support member includes a cylindrical body 11, a first retaining ring 12, and a second retaining ring 13. The first retaining ring 12 and the second retaining ring 13 are sleeved on the outside of the cylindrical body 11 and spaced apart. The cylindrical body 11, the first retaining ring 12, and the second retaining ring 13 are integrally formed. The electromagnetic coil 20 is wound around the outside of the cylindrical body 11 and is located between the first retaining ring 12 and the second retaining ring 13. The telescopic shaft 30 is telescopically disposed inside the cylindrical body 11, and the electromagnetic coil 20 is energized to drive the telescopic shaft 30 to extend or retract. The guide member is disposed between the cylindrical body 11 and the telescopic shaft 30, and the guide member is guided and engaged with the telescopic shaft 30.

[0035] In this way, the first retaining ring 12 and the second retaining ring 13 can limit the winding position of the electromagnetic coil 20, making the position of the electromagnetic coil 20 outside the cylinder 11 more accurate, so as to facilitate the driving operation of the telescopic shaft 30 by the electromagnetic coil 20. The cylinder 11, the first retaining ring 12, and the second retaining ring 13 are integrally formed, so that the positions of the first retaining ring 12 and the second retaining ring 13 relative to the cylinder 11 can be fixed during production, making the positions of the first retaining ring 12 and the second retaining ring 13 relative to the cylinder 11 more accurate. This eliminates the need for positioning and fixing operations of the first retaining ring 12 and the second retaining ring 13 on the cylinder 11, making the assembly steps of the electromagnetic drive assembly simpler and faster. This integrated design of the integrally formed structure simplifies the assembly steps of the electromagnetic drive assembly, reduces the number of independent parts, thereby reducing the need for precise alignment and fixing during the assembly process, significantly shortening the assembly time, and reducing the number of assembly steps. The integrally formed structure not only ensures the structural stability of the electromagnetic drive assembly, but also eliminates the alignment errors that may be introduced by the assembly of multiple parts in related technologies, improving the overall performance of the electromagnetic drive assembly. The guide member allows the telescopic shaft 30 to extend and retract more smoothly along a preset direction, improving the driving stability of the electromagnetic drive assembly. Therefore, the technical solution of this embodiment effectively solves the problem of complex assembly steps in the drive system of functional seats in related technologies. Furthermore, the cylinder 11, the first retaining ring 12, and the second retaining ring 13 are integrally formed structures, reducing the need for positioning structures in related technologies, thereby making the electromagnetic drive assembly more compact and occupying less space.

[0036] In this embodiment, the electromagnetic drive assembly also includes a heat-shrinkable sheath sleeved on the outside of the electromagnetic coil 20, the heat-shrinkable sheath being made of insulating material.

[0037] like Figures 1 to 7 As shown, in Embodiment 1, the guide component includes a guide rib 41, which is disposed on the inner wall of the cylinder 11 and engages with the telescopic shaft 30. The guide rib 41 reduces the direct contact area between the telescopic shaft 30 and the inner wall of the cylinder 11, reducing friction and preventing potential jamming or wear during telescopic movement. This allows the telescopic shaft 30 to move more smoothly along the axial direction of the cylinder 11, improving the service life and reliability of the electromagnetic drive assembly and ensuring that the telescopic shaft 30 can move smoothly and steadily along the axial direction of the cylinder 11 under the influence of magnetic force.

[0038] like Figures 1 to 7As shown, in Embodiment 1, guide ribs 41 extend along the axial direction of the cylinder 11, and there are multiple guide ribs 41, which are spaced apart circumferentially along the cylinder 11. This design further enhances the stability of the telescopic shaft 30 during movement. The multiple guide ribs 41 spaced apart circumferentially along the cylinder 11 make the force on the telescopic shaft 30 more uniform during movement. Even under high frequency or heavy load conditions, the multiple guide ribs 41 can maintain stable guidance of the telescopic shaft 30, avoiding the overall performance degradation caused by the failure of a single guide point.

[0039] In Embodiment 1, the guide rib 41 is integrally formed with the cylinder 11. The guide rib 41 is made of alloy plastic material.

[0040] In other embodiments, the guide rib 41 is a guide ring, which extends circumferentially along the cylinder 11. The guide ring is surrounded on the outside of the telescopic shaft 30, and there may be one or more guide rings. When there are multiple guide rings, they are spaced apart along the axial direction of the cylinder 11.

[0041] like Figures 4 to 7 As shown, the difference between Embodiment 2 and Embodiment 1 lies in the composition of the guide component. The guide component in Embodiment 2 includes a guide rib 41 and a bearing. In Embodiment 2, the guide component further includes a bearing, which is disposed within the cylinder 11. The telescopic shaft 30 passes through the bearing, and the bearing and guide rib 41 are arranged adjacent to each other along the axial direction of the cylinder 11. This design not only further reduces the friction between the telescopic shaft 30 and the cylinder 11 but also ensures the axial positioning of the telescopic shaft 30 during telescopic movement, making the movement of the telescopic shaft 30 smoother and improving the dynamic performance of the electromagnetic drive assembly.

[0042] In Embodiment 2, the guide rib 41 is integrally formed with the cylinder 11. The guide rib 41 has a lower processing cost and higher bearing guiding accuracy. Applying the technical solution of Embodiment 2 can balance processing cost and guiding accuracy. The bearing is an oil-impregnated bushing 42 or a linear bearing 43.

[0043] It should be noted that "bearing is set inside cylinder 11" means that the bearing is at least partially set inside cylinder 11, or the bearing is completely set inside cylinder 11.

[0044] like Figure 6 and Figure 7As shown, in Embodiment 2, the bearing is an oil-impregnated bushing 42. In the projection plane perpendicular to the axis of the cylinder 11, the apexes of multiple guide ribs 41 are located within the trajectory circle 411, and the diameter of the trajectory circle 411 is greater than or equal to the inner diameter of the oil-impregnated bushing 42. The oil-impregnated bushing 42 provides self-lubrication during the movement of the telescopic shaft 30, reducing maintenance frequency and improving the operating efficiency of the electromagnetic drive assembly. This design ensures that the telescopic shaft 30 does not make hard contact with the guide ribs 41 during movement, thereby avoiding wear on the telescopic shaft 30, effectively extending the service life of the electromagnetic drive assembly, and improving the overall operational stability. Furthermore, the fact that the diameter of the trajectory circle 411 is greater than or equal to the inner diameter of the oil-impregnated bushing 42 reduces the machining accuracy requirements of the guide ribs 41, thereby reducing production costs.

[0045] like Figure 6 and Figure 7 As shown, in Embodiment 2, the bearing is an oil-impregnated bushing 42. The oil-impregnated bushing 42 extends along the axial direction of the cylinder 11 to have a bushing length L. The inner diameter of the oil-impregnated bushing 42 is D, satisfying: 0.5 ≤ L / D ≤ ​​2.0. The oil-impregnated bushing 42 can provide self-lubrication during the movement of the telescopic shaft 30, reducing the maintenance frequency and improving the operating efficiency of the electromagnetic drive assembly. Optimizing the dimensions of the oil-impregnated bushing 42 can reduce the procurement or processing costs of the oil-impregnated bushing 42 while ensuring that it provides stable guidance for the telescopic shaft 30.

[0046] It should be noted that the units for the bushing length L and the inner diameter D of the oil-impregnated bushing 42 are the same. In Embodiment 2, the units for both the bushing length L and the inner diameter D of the oil-impregnated bushing 42 are millimeters.

[0047] Preferably, the L / D is: 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0.

[0048] like Figures 4 to 7 As shown, the difference between Embodiment 3 and Embodiment 1 lies in the composition of the guide component. In Embodiment 3, the guide component includes a bearing. In Embodiment 3, the guide component further includes a bearing, which is disposed within the cylinder 11, and the telescopic shaft 30 passes through the bearing. The bearing allows the telescopic shaft 30 to extend and retract more smoothly along the axial direction of the cylinder 11, enabling the electromagnetic drive assembly to operate with low friction and improving the driving stability of the electromagnetic drive assembly. Furthermore, the bearing facilitates installation, improving the assembly efficiency of the electromagnetic drive assembly.

[0049] like Figures 4 to 7As shown, in Embodiment 3, the bearing is either an oil-impregnated bushing 42 or a linear bearing 43. This allows the electromagnetic drive assembly to adapt to different operating environments and application requirements. The oil-impregnated bushing 42 provides self-lubrication, reducing maintenance needs. The linear bearing 43, on the other hand, is suitable for applications requiring higher precision, offering less friction and a longer service life. In Embodiment 3, the linear bearing 43 is a ball linear bearing.

[0050] like Figure 1 and Figure 4 As shown, the support also includes a first leg 14 and a second leg 15 respectively disposed at both ends of the cylinder 11. The first leg 14 is connected to the first retaining ring 12. The cylinder 11, the first retaining ring 12, the second retaining ring 13, the first leg 14, and the second leg 15 are integrally formed. The electromagnetic drive assembly also includes a base 50, on which the support is disposed. The first leg 14 and the second leg 15 support the cylinder 11, preventing the electromagnetic coil 20, which is sleeved outside the cylinder 11, from contacting the base 50 or the ground, thus improving the service life of the electromagnetic coil 20. The integrally formed structure of the cylinder 11, the first retaining ring 12, the second retaining ring 13, the first leg 14, and the second leg 15 enhances the overall stability and rigidity of the support. The integral structure reduces positioning and connection operations during assembly, improving the assembly efficiency of the electromagnetic drive assembly. The base 50 further ensures the stability of the electromagnetic drive assembly installation, reduces vibration and noise caused by unstable installation, and improves the reliability of the electromagnetic drive assembly. The base 50 also facilitates the connection of the electromagnetic drive assembly with other structures.

[0051] In this embodiment, the base 50 and the support are fixedly connected by fasteners. During the assembly of the electromagnetic drive assembly, the electromagnetic coil 20 is first wound around the outside of the cylinder 11, and then the support is fixed to the base 50 by fasteners.

[0052] In other embodiments, the support further includes a first leg 14 and a second leg 15 respectively disposed at both ends of the cylinder 11. The first leg 14 is connected to the first retaining ring 12, and the cylinder 11, the first retaining ring 12, the second retaining ring 13, the first leg 14, and the second leg 15 are integrally formed. Alternatively, the electromagnetic drive assembly also includes a base 50, and the support is disposed on the base 50.

[0053] This application also provides a functional seat, which includes a base, a seat body, and an electromagnetic drive assembly, wherein the electromagnetic drive assembly is the aforementioned electromagnetic drive assembly. The electromagnetic drive assembly is disposed on the base, and the seat body is oscillatingly disposed on the base. One end of a telescopic shaft 30 is connected to the seat body, and the telescopic shaft 30 extends and retracts to drive the seat body to oscillate. Because the aforementioned electromagnetic drive assembly can solve the problem of complex assembly steps in the drive system of functional seats in related technologies, a functional seat with this electromagnetic drive assembly can solve the same technical problem. The telescopic component allows the seat body to oscillate reciprocally relative to the base.

[0054] In this embodiment, one end of the telescopic shaft 30 is provided with a through hole. The functional seat also includes a hinge shaft and a connecting rod structure. The hinge shaft passes through the through hole, and the connecting rod structure connects the seat body and the hinge shaft so that the connecting rod structure is hinged to the telescopic shaft 30. One end of the telescopic shaft 30 is located on one side of the swing center of the seat body on the base. The functional seat is preferably a rocking chair.

[0055] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electromagnetic drive assembly, characterized in that, include: The support includes a cylindrical body (11), a first retaining ring (12) and a second retaining ring (13). The first retaining ring (12) and the second retaining ring (13) are sleeved on the outside of the cylindrical body (11) and spaced apart. The cylindrical body (11), the first retaining ring (12) and the second retaining ring (13) are integrally formed structures. An electromagnetic coil (20) is wound around the outside of the cylinder (11), and the electromagnetic coil (20) is located between the first retaining ring (12) and the second retaining ring (13); A telescopic shaft (30) is telescopically disposed inside the cylinder (11), and the electromagnetic coil (20) is energized to drive the telescopic shaft (30) to extend or retract; A guide is provided between the cylinder (11) and the telescopic shaft (30), and the guide is guided and engaged with the telescopic shaft (30).

2. The electromagnetic drive assembly according to claim 1, characterized in that, The guide component includes a guide rib (41), which is disposed on the inner wall of the cylinder (11) and is in contact with the telescopic shaft (30).

3. The electromagnetic drive assembly according to claim 2, characterized in that, The guide ribs (41) extend along the axial direction of the cylinder (11), and there are multiple guide ribs (41), which are spaced apart circumferentially along the cylinder (11).

4. The electromagnetic drive assembly according to claim 3, characterized in that, The guide also includes a bearing, which is disposed inside the cylinder (11). The telescopic shaft (30) passes through the bearing, and the bearing and the guide rib (41) are disposed adjacent to each other along the axial direction of the cylinder (11).

5. The electromagnetic drive assembly according to claim 4, characterized in that, The bearing is an oil-impregnated bushing (42). In the projection plane perpendicular to the axis of the cylinder (11), the apexes of the plurality of guide ribs (41) are located in the trajectory circle (411), and the diameter of the trajectory circle (411) is greater than or equal to the inner diameter of the oil-impregnated bushing (42).

6. The electromagnetic drive assembly according to claim 4, characterized in that, The bearing is an oil-impregnated bushing (42), which extends along the axial direction of the cylinder (11) to have a bushing length L. The inner diameter of the oil-impregnated bushing (42) is D, which satisfies: 0.5≤L / D≤2.

0.

7. The electromagnetic drive assembly according to claim 1, characterized in that, The guide includes a bearing, which is disposed inside the cylinder (11), and the telescopic shaft (30) passes through the bearing.

8. The electromagnetic drive assembly according to claim 7, characterized in that, The bearing is an oil-impregnated bushing (42), or the bearing is a linear bearing (43).

9. The electromagnetic drive assembly according to claim 1, characterized in that, The support member further includes a first leg (14) and a second leg (15) respectively disposed at both ends of the cylinder (11), the first leg (14) being connected to the first retaining ring (12), and the cylinder (11), the first retaining ring (12), the second retaining ring (13), the first leg (14), and the second leg (15) being an integrally formed structure; and / or, The electromagnetic drive assembly also includes a base (50), and the support member is disposed on the base (50).

10. A functional seat, comprising a base, a seat body, and an electromagnetic drive assembly, characterized in that, The electromagnetic drive assembly is the electromagnetic drive assembly according to any one of claims 1 to 9. The electromagnetic drive assembly is disposed on the base. The seat body is swayably disposed on the base. One end of the telescopic shaft (30) is connected to the seat body. The telescopic shaft (30) extends and retracts to drive the seat body to sway.

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