A rhythm movement mechanism for a massager and a massage chair

Abstract

The utility model provides a kind of for massager's pulsation movement core and massage chair.The pulsation movement core is suitable for output vertical pulsation with amplitude less than 4.0mm, it includes pedestal, bearing seat, pulsation drive mechanism and eccentricity limiting mechanism.Eccentricity limiting mechanism includes four adapter plates that are arranged in front and back and left and right interval and at least one linkage rod for connecting a pair of adapter plates in front and back.The adapter plate has the first adapter part of pivotally connecting pedestal, the second adapter part of pivotally connecting bearing seat and the third adapter part of pivotally connecting linkage rod.Eccentricity limiting mechanism further includes two rotating shafts in front and back respectively extending in left and right direction, and rotating shaft is rotatably positioned on pedestal.A pair of adapter plates in left and right direction are fixedly connected in the state of being positioned with two first adapter parts on same rotating shaft, so that the coaxiality of two second adapter parts of the pair of adapter plates in left and right direction is less than 0.10mm.The assembly precision of the pulsation movement core is high, and movement stability is good, especially suitable for output high-frequency small-amplitude pulsation.

Description

Technical Field

[0001] This utility model relates to the field of massage chair technology, and in particular to a percussion core for a massager and a massage chair. Background Technology

[0002] In the field of massage equipment, the pulse motor core, as the core component for realizing the vibration massage function, directly affects the massage effect and the durability of the equipment due to its motion accuracy and stability. To ensure that the pulse motor core outputs vertical pulses, a yaw limiting mechanism is usually required to eliminate horizontal swaying. In existing technology, one yaw limiting mechanism employs two sets of linkage mechanisms, which are independently set and roughly symmetrically arranged to balance the force and constrain the motion of the pulse motor core to vertical reciprocating motion.

[0003] However, this type of design suffers from insufficient precision control and poor dynamic stability. Specifically, because the two sets of linkage mechanisms are set independently, their installation errors and slight displacements during independent rotation can lead to a deviation in the synchronicity of their movements. This is especially true when the amplitude of the vertical rhythm output by the motor core is small; in such cases, the vertical rhythm is consumed, reducing massage comfort and even preventing the achievement of the preset massage effect. Furthermore, the asynchronous vibration can also affect the NVH (noise, vibration, and harshness) performance of the massager, and may even cause the massager to jam or become abnormally damaged.

[0004] Therefore, it is necessary to propose a new technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a percussion core and massage chair with high assembly precision and good motion stability.

[0006] To achieve the above objectives, this utility model employs the following technical solution: a rhythmic core for a massager, suitable for outputting vertical rhythmic vibrations with an amplitude of less than 4.0 mm, comprising a base, a support base, a rhythmic drive mechanism, and a sway limiting mechanism; the sway limiting mechanism comprises four adapter plates arranged at intervals in the front, back, left, and right directions, and at least one linkage rod for connecting a pair of front and back adapter plates; wherein, the adapter plate comprises:

[0007] A first adapter portion, adapted to pivotally connect to the base; and

[0008] The second adapter is adapted to pivotally connect to the load-bearing seat;

[0009] The third adapter is adapted to pivotally connect the linkage rod;

[0010] The sway limiting mechanism further includes two rotating shafts extending in the left and right directions, which are rotatably positioned on the base. When the left and right transition plates are positioned, their two first transition parts are fixedly connected to the same rotating shaft, so that the coaxiality of the two second transition parts of the left and right transition plates is less than 0.10mm.

[0011] Optionally, the amplitude of the vertical rhythm is selected from a set value in the range of 1.5-2.5 mm.

[0012] Optionally, the two first transition parts are fixed to the same rotating shaft by welding, so as to improve the dynamic fatigue strength of the connection between the left and right pair of transition plates and the rotating shaft while linking the left and right pair of transition plates to rotate synchronously.

[0013] Optionally, the coaxiality of the two second adapter portions of the left and right pair of adapter plates is less than 0.05 mm.

[0014] Optionally, the coaxiality of the two third adapter portions of the left and right pair of adapter plates is less than 0.10 mm, preferably less than 0.05 mm.

[0015] Optionally, the adapter plate is a V-shaped plate or a straight plate.

[0016] Optionally, the rotating shaft is positioned and mounted on the base via a first bearing.

[0017] Optionally, the base includes a support base and a press-fit seat connected to the support base, wherein the first bearing is mounted on the support base and is pressed and positioned by the press-fit seat.

[0018] Optionally, the first adapter is a connecting hole through which the rotating shaft passes, and the connecting hole and the rotating shaft are provided with a positioning plane that cooperates with each other to prevent the rotating shaft from rotating relative to the connecting hole before welding.

[0019] Optionally, the second adapter is connected to the load-bearing seat via a C-shaped connector. The sway limiting mechanism includes a second pivot assembly that pivotally connects the second adapter to the connector. The second pivot assembly includes a second pivot, a second bearing sleeved on the second pivot, and second axial limiting members located on both sides of the second bearing. The second adapter, the second bearing, and the second axial limiting members are all located within the C-shape of the connector.

[0020] And / or, the linkage includes a C-shaped connector, and the sway limiting mechanism includes a third pivot assembly that pivotally connects the third adapter to the connector. The third pivot assembly includes a third pivot, a third bearing sleeved on the third pivot, and third axial limiting members located on both sides of the third bearing; wherein the third adapter, the third bearing, and the third axial limiting members are all located within the C-shape of the connector.

[0021] Optionally, the drive mechanism includes a rotating shaft connected to a power source, an eccentric cam fixed to the rotating shaft in an eccentric state, and a swing sleeve sleeved on the outside of the eccentric cam. The swing sleeve is pivotally connected to the support base in a manner that allows it to swing about a set axis. The two ends of the rotating shaft are supported by two bearing seats, at least one of which is arranged between two bases spaced apart in the left-right direction to shorten the span between the two bearing seats.

[0022] This utility model is also implemented using the following technical solution: a massage chair, including a base, a chair body and a vibration core as described above, wherein the chair body is attached to the upper part of the vibration core, and the base is supported below the vibration core.

[0023] The rhythmic motor core provided by this utility model includes a sway limiting mechanism comprising two rotating shafts extending in the left and right directions, respectively. The rotating shafts are rotatably positioned on a base. When positioned, a pair of left and right adapter plates have their two first adapter parts fixedly connected to the same rotating shaft, making the coaxiality of the two second adapter parts of the pair of left and right adapter plates less than 0.10mm. This improves the assembly accuracy of the sway limiting mechanism and ensures that the rhythmic motor core outputs precise vertical rhythm. This solution is particularly effective in massagers that output high-frequency, small-amplitude vibration massage, significantly improving the massage effect. At the same time, this design also reduces noise and adverse vibrations, improving the durability of the device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0025] Figure 1 This is a three-dimensional assembly diagram of an embodiment of the massage chair of this utility model.

[0026] Figure 2 This is a perspective view of the percussion core inside the base shell in one embodiment of the massage chair of this utility model.

[0027] Figure 3 This is a perspective view of an embodiment of the rhythmic motor core of this utility model.

[0028] Figure 4 This is a perspective view of another embodiment of the rhythmic motor core of this utility model.

[0029] Figure 5 This is a side view of an embodiment of the rhythmic motor core of this utility model.

[0030] Figure 6 This is a three-dimensional assembly diagram of some components of the oscillation limiting mechanism in one embodiment of the rhythmic motor core of this utility model.

[0031] Figure 7 This is a three-dimensional exploded view of the rotating shaft and a transition plate in one embodiment of the rhythmic motor core of this utility model.

[0032] Figure 8 This is a three-dimensional exploded view of some components of the oscillation limiting mechanism in one embodiment of the rhythmic motor core of this utility model.

[0033] Figure 9 This is a three-dimensional exploded view of some components of the rhythm drive mechanism in one embodiment of the rhythm motor core of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Massage chair; 1. Chair body; 11. Seat; 12. Backrest; 13. Armrests; 14. Pillow; 2. Base; 21. Base shell; 22. Legs; 3. Rhythm motor core; 31. Base; 311. Support seat; 312. Pressing seat; 32. Load-bearing seat; 33. Rhythm drive mechanism; 331. Motor; 332. Transmission component; 333. Rotating shaft; 334. Eccentric cam; 335. Swing sleeve; 34. Swing limiting mechanism; 341. Adapter plate; 3411. First rotation 3412, Second adapter; 3413, Third adapter; 342, Linkage rod; 3421, Connector; 343, Rotating shaft; 3431, Positioning plane; 344, Connector; 345, First bearing; 346, Second pivot assembly; 3461, Second pivot; 3462, Second axial limiter; 3463, Second bearing; 347, Third pivot assembly; 3471, Third pivot; 3472, Third axial limiter; 3473, Third bearing; 35, Shaft seat. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," etc., mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," and "near" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0041] This invention provides a rhythmic motor core and massage chair with high assembly precision and good motion stability. By improving the design of the yaw limiting mechanism and optimizing the connection methods and structural design between components, the rhythmic motor core effectively eliminates horizontal swaying, ensures precise vertical rhythmic output, and improves the stability and durability of the entire system.

[0042] The embodiments shown in the accompanying drawings will be described in detail below.

[0043] Please see Figures 1 to 9 As shown, this utility model provides a rhythmic core 3 for a massager. The rhythmic core 3 is suitable for outputting vertical rhythmic vibrations with an amplitude of less than 4.0 mm. The rhythmic core 3 includes a base 31, a support base 32, a rhythmic drive mechanism 33, and a swing limiting mechanism 34. Among them, the swing limiting mechanism 34 is one of the core innovations of this utility model. Its design aims to ensure that the rhythmic core 3 maintains the synchronicity of vertical movement during operation and eliminates horizontal swinging.

[0044] Please see Figure 1 As shown, this utility model also provides a massage chair 100, which uses the aforementioned vibration core 3. The massage chair 100 provided in this embodiment includes a chair body 1, a base 2, and the aforementioned vibration core 3. The chair body 1 is attached above the vibration core 3, and the base 2 is supported below the vibration core 3. The chair body 1 includes a seat 11, a backrest 12, armrests 13, and a headrest 14. The seat 11 is for the user's buttocks to sit on; the backrest 12 is for the user's back to lean against while sitting on the massage chair 100; the armrests 13 are located on both sides of the seat 11 and are used to support the user's upper arms; the headrest 14 is located above the backrest 12 and is used to support the user's head and neck. The base 2 includes a base shell 21 and legs 22. The vibration core 3 is installed inside the base shell 21. The legs 22 are located below the base shell 21 and are the components that support the entire massage chair 100 in contact with the ground. The support leg 22 is equipped with casters to facilitate the movement of the massage chair 100. The vibration core 3 provided in this embodiment is not limited to use on the massage chair 100. In other embodiments, the vibration core 3 can also be used on other types of massage devices such as foot massagers, leg massagers, and massage beds.

[0045] Please see Figure 2 As shown, the rhythmic core 3, as the core component of the massage chair 100, provides vibration massage function to the chair body 1 through its precise and stable vertical rhythm. The rhythmic core 3 includes a base 31, a support seat 32, a rhythmic drive mechanism 33, and a swing limiting mechanism 34.

[0046] The base 31 is a component for mounting the rhythm drive mechanism 33 and the yaw limiting mechanism 34. In this embodiment, the base 31 is mounted on the base shell 21; in other embodiments, the base 31 may be an integrally formed structure on the base shell 21. Please refer to [link to relevant documentation]. Figure 3 As shown, the support seat 32 is a component that combines the rhythm drive mechanism 33 and the sway limiting mechanism 34 with the chair body 1. In this embodiment, the support seat 32 is a sheet metal part fixed below the seat 11 of the chair body 1, and both the rhythm drive mechanism 33 and the sway limiting mechanism 34 are connected to the support seat 32.

[0047] The rhythmic drive mechanism 33 is a combination of components that provide driving force. (See also...) Figure 3 , Figure 4 and Figure 9 As shown, the rhythm drive mechanism 33 includes a motor 331 as a power source, a rotating shaft 333 connected to the power source via a transmission member 332, an eccentric cam 334 fixed eccentrically on the rotating shaft 333, and an eccentric sleeve 335 pivotally connected to the support seat 32 in a manner capable of oscillating about a set axis. The outer peripheral surface of the eccentric cam 334 forms a cam surface, and the eccentric sleeve 335 is movably engaged with the cam surface of the eccentric cam 334. In this embodiment, the distance of the vertical rhythm of the rhythm drive core 3 is determined by the eccentricity of the eccentric cam 334. In some embodiments, the rhythm drive core 3 outputs a vertical rhythm with an amplitude less than 4.0 mm, that is, the distance between the highest and lowest positions of the rhythm drive core 3 driving the support seat 32 is less than 4.0 mm. In this embodiment, the amplitude of the vertical rhythm is selected from a set value in the range of 1.5-2.5 mm, specifically, for example, 2.0 mm.

[0048] In this embodiment, the transmission component 332 includes a belt and a pulley. The pulley is fixed on the rotating shaft 333, and the belt is sleeved between the output end of the motor 331 and the pulley. The output end of the motor 331 drives the rotating shaft 333 to rotate via the belt and pulley. In this embodiment, both ends of the rotating shaft 333 are supported by two shaft seats 35. To shorten the span between the two shaft seats 35 and improve the stability and durability of the entire drive mechanism, at least one of the two shaft seats 35 is configured between two bases 31 arranged spaced apart in the left-right direction. Furthermore, one of the two shaft seats 35 can be the base 31 itself. This design not only simplifies the structure but also improves the integration and stability of the entire drive mechanism.

[0049] The yaw limiting mechanism 34 is one of the core innovations of this invention. Its design aims to ensure that the actuator core 3 maintains vertical movement during operation, eliminating horizontal swaying. Please refer to... Figure 3 and Figures 5 to 8 As shown, the sway limiting mechanism 34 includes four transition plates 341 arranged at intervals in the front-back and left-right directions, at least one linkage rod 342 for connecting a pair of front-back transition plates 341, and two front-back rotating shafts 343 extending in the left-right direction respectively. Figure 3 , 5As indicated by arrows 6 and 7, each adapter plate 341 has three adapter portions: a first adapter portion 3411, a second adapter portion 3412, and a third adapter portion 3413. The first adapter portion 3411 is adapted to pivotally connect to the base 31, the second adapter portion 3412 is adapted to pivotally connect to the load-bearing seat 32, and the third adapter portion 3413 is adapted to pivotally connect to the linkage rod 342. The rotating shaft 343 is rotatably positioned on the base 31. When the left and right adapter plates 341 are positioned, their two first adapter portions 3411 are fixedly connected to the same rotating shaft 343, such that the coaxiality of the two second adapter portions 3412 of the left and right adapter plates 341 is less than 0.10 mm.

[0050] Specifically, in this embodiment, the adapter plate 341 is a V-shaped metal plate. The first adapter portion 3411, the second adapter portion 3412, and the third adapter portion 3413 are respectively located near the pointed corner of the V-shape and the two free ends. The second adapter portion 3412 and the third adapter portion 3413 can rotate with the first adapter portion 3411 as a fulcrum. In other embodiments, the adapter plate 341 is not limited to a V-shaped plate; it can also be a straight plate. Further, the first adapter portion 3411 is a connecting hole through which the rotating shaft 343 passes. The connecting hole and the rotating shaft 343 are provided with a positioning plane 3431 that cooperates with each other to prevent relative rotation between the rotating shaft 343 and the connecting hole before welding. In this embodiment, the connecting hole is a D-shaped hole, and the part of the rotating shaft 343 inserted into the connecting hole is a D-shaped column with a D-shaped cross-section. The positioning plane 3431 enables the rotating shaft 343 to be quickly assembled with the first adapter 3411 at the beginning of the assembly and provides a positioning function for the subsequent welding and fixing of the rotating shaft 343 and the adapter plate 341.

[0051] In this embodiment, the two first transition portions 3411 are fixed to the same rotating shaft 343 by welding, thereby improving the dynamic fatigue strength of the connection between the left and right pair of transition plates 341 and the rotating shaft 343 while linking the left and right pair of transition plates 341 to rotate synchronously. Welding ensures the accuracy of the relative position between the rotating shaft 343 and the pair of transition plates 341. Compared to assembling the pair of transition plates 341 individually with the base 31, where independent assembly errors exist, the coaxiality of the two second transition portions 3412 and the coaxiality of the two third transition portions 3413 of the left and right pair of transition plates 341 are difficult to guarantee. This embodiment of the invention significantly reduces assembly errors and ensures the synchronicity of the movement of the pair of left and right adapter plates 341 by welding them to the rotating shaft 343 in a positioned state. In addition, each adapter plate 341 is manufactured using a high-precision machining method, resulting in smaller machining errors between the various adapter parts in each adapter plate 341. Ultimately, the coaxiality of the two second adapter parts 3412 and the coaxiality of the two third adapter parts 3413 are both less than 0.05mm, improving stability and durability.

[0052] Furthermore, the rotating shaft 343 is mounted on the base 31 via a first bearing 345. Specifically, the base 31 includes a support 311 and a pressing seat 312 connected to the support 311. The first bearing 345 is mounted on the support 311 and pressed and positioned by the pressing seat 312. This design ensures the stable installation and precise positioning of the rotating shaft 343 on the base 31. In this embodiment, the support 311 and the pressing seat 312 are each provided with a semi-circular groove, which together form a circular groove. The first bearing 345 passes through the rotating shaft 343 and is assembled in the circular groove. The pressing seat 312 and the support 311 are locked together with screws to press and position the first bearing 345 in the circular groove.

[0053] The second adapter 3412 is adapted to pivotally connect to the load-bearing seat 32. In this embodiment, the sway limiting mechanism 34 includes a C-shaped connector 344, and the second adapter 3412 is connected to the load-bearing seat 32 through the C-shaped connector 344. Specifically, the sway limiting mechanism 34 includes a second pivot assembly 346 that pivotally connects the second adapter 3412 to the connector 344. The second pivot assembly 346 includes a second pivot 3461, a second bearing 3463 sleeved on the second pivot 3461, and second axial limiting members 3462 located on both sides of the second bearing 3463. The second adapter 3412, the second bearing 3463, and the second axial limiting members 3462 are all located within the C-shape of the connector 344. This design not only ensures a stable connection between the second adapter 3412 and the support seat 32, but also prevents the second adapter 3412 from wobbling in the axial direction of the second pivot 3461 through the action of the second bearing 3463 and the second axial limiting member 3462, thereby reducing wear and jamming during the movement process.

[0054] The third adapter 3413 is adapted to pivotally connect the linkage rod 342. In this embodiment, both ends of the linkage rod 342 include C-shaped connectors 3421 to connect to the two third adapters 3413 of a pair of adapter plates 341 in the front-rear direction. In this embodiment, a single linkage rod 342 connects a pair of adapter plates 341 in the front-rear direction; in other embodiments, multiple linkage rods 342 can be used to connect a pair of adapter plates 341 in the front-rear direction. Further, the yaw limiting mechanism 34 also includes a third pivot assembly 347 that pivotally connects the third adapter 3413 to the connectors 3421. The third pivot assembly 347 includes a third pivot 3471, a third bearing 3473 sleeved on the third pivot 3471, and third axial limiting members 3472 located on both sides of the third bearing 3473. The third adapter 3413, the third bearing 3473, and the third axial limiting member 3472 are all located within the U-shape of the connector 3421. This design ensures a stable connection between the third adapter 3413 and the linkage rod 342, and through the action of the third bearing 3473 and the third axial limiting member 3472, prevents the third adapter 3413 from wobbling in the axial direction of the third pivot 3471, reducing wear and jamming during movement.

[0055] When the massage chair 100 is in operation, the motor 331 of the rhythm drive mechanism 33 drives the rotating shaft 333 to rotate. Since the eccentric cam 334 is fixed to the rotating shaft 333 in an eccentric state, when the rotating shaft 333 rotates, the eccentric cam 334 will drive the swing sleeve 335 to swing around a set axis. The swing of the swing sleeve 335 is transmitted to the chair body 1 through the support seat 32, thereby realizing the rhythm of the massage chair. At the same time, the swing limiting mechanism 34, through its unique structural design, ensures that the rhythm core 3 maintains vertical movement during the movement. Specifically, when the rhythmic core 3 is subjected to external force, the pair of transition plates 341 and the linkage rod 342 in the sway limiting mechanism 34 prevent the support seat 32 from moving in the horizontal direction, thus eliminating the influence of horizontal sway on the massage effect. Meanwhile, the pair of transition plates 341 in the left and right directions are fixed together by the rotating shaft 343, which has high assembly precision, ensuring the synchronicity of the movement of the two sets of linkage mechanisms in the left and right directions, and improving the smoothness and accuracy of the vertical rhythm.

[0056] As described above in the specific embodiments, the rhythmic core 3 and massage chair 100 provided by this utility model, through the design of the sway limiting mechanism 34, ensure that the rhythmic core 3 outputs precise vertical rhythms, avoiding the impact of horizontal swaying on the massage effect. Furthermore, by optimizing the connection and fixing methods between the various adapter plates 341, the stability and durability of the entire system are improved, thus providing users with a more comfortable and effective massage experience. Simultaneously, because the sway limiting mechanism 34 can effectively eliminate horizontal swaying, it reduces the noise and adverse vibrations generated by the massage chair 100 during operation, improves the NVH performance of the massage chair 100, extends the service life of the massage chair 100, and also provides users with a quieter and more comfortable massage environment.

[0057] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A vibration core for a massager, suitable for outputting vertical vibrations with an amplitude of less than 4.0 mm, comprising a base, a support base, a vibration drive mechanism, and a sway limiting mechanism; the sway limiting mechanism comprises four adapter plates arranged at intervals in the front, back, left, and right directions, and at least one linkage rod for connecting a pair of front and back adapter plates; characterized in that, The adapter plate has the following features: A first adapter portion, adapted to pivotally connect to the base; and The second adapter is adapted to pivotally connect to the load-bearing seat; The third adapter is adapted to pivotally connect the linkage rod; The sway limiting mechanism further includes two rotating shafts extending in the left and right directions, which are rotatably positioned on the base. When the left and right transition plates are positioned, their two first transition parts are fixedly connected to the same rotating shaft, so that the coaxiality of the two second transition parts of the left and right transition plates is less than 0.10mm.

2. The beater core as described in claim 1, characterized in that, The amplitude of the vertical rhythm is selected from a set value in the range of 1.5-2.5mm.

3. The beater core as described in claim 1 or 2, characterized in that, The two first transition parts are fixed to the same rotating shaft by welding, so as to improve the dynamic fatigue strength of the connection between the left and right pair of transition plates and the rotating shaft while linking the left and right pair of transition plates to rotate synchronously.

4. The beater core as described in claim 1 or 2, characterized in that, The coaxiality of the two second adapter parts of the left and right pair of adapter plates is less than 0.05mm.

5. The beater core as described in claim 1 or 2, characterized in that, The coaxiality of the two third adapter parts of the left and right pair of adapter plates is less than 0.10 mm.

6. The beater core as described in claim 1 or 2, characterized in that, The adapter plate is a V-shaped plate or a straight plate.

7. The beater core as described in claim 1 or 2, characterized in that, The rotating shaft is positioned and mounted on the base via a first bearing.

8. The beater core as described in claim 7, characterized in that, The base includes a support base and a press-fit seat connected to the support base, wherein the first bearing is mounted on the support base and is pressed and positioned by the press-fit seat.

9. The beater core as described in claim 3, characterized in that, The first adapter is a connecting hole through which the rotating shaft passes. The connecting hole and the rotating shaft are provided with positioning planes that cooperate with each other to prevent the rotating shaft from rotating relative to the connecting hole before welding.

10. The beater core as described in claim 1 or 2, characterized in that, The second adapter is connected to the load-bearing seat via a C-shaped connector. The sway limiting mechanism includes a second pivot assembly that pivotally connects the second adapter to the connector. The second pivot assembly includes a second pivot, a second bearing sleeved on the second pivot, and second axial limiting members located on both sides of the second bearing. The second adapter, the second bearing, and the second axial limiting members are all located within the C-shape of the connector. And / or, the linkage includes a C-shaped connector, and the sway limiting mechanism includes a third pivot assembly that pivotally connects the third adapter to the connector. The third pivot assembly includes a third pivot, a third bearing sleeved on the third pivot, and third axial limiting members located on both sides of the third bearing; wherein the third adapter, the third bearing, and the third axial limiting members are all located within the C-shape of the connector.

11. The beater core as described in claim 1 or 2, characterized in that, The drive mechanism includes a rotating shaft connected to a power source, an eccentric cam fixed to the rotating shaft in an eccentric state, and a swing sleeve sleeved on the outside of the eccentric cam. The swing sleeve is pivotally connected to the support base in a manner that allows it to swing about a set axis. The two ends of the rotating shaft are supported by two bearing seats, at least one of which is arranged between two bases spaced apart in the left-right direction to shorten the span between the two bearing seats.

12. A massage chair, characterized in that, It includes a base, a chair body, and a vibration motor core as described in any one of claims 1 to 11, wherein the chair body is attached above the vibration motor core, and the base is supported below the vibration motor core.

Images