Massage machine core and automobile seat

Abstract

The massage movement core comprises a fixed seat, a movable seat, a driving shaft, a massage arm and a connecting rod, the massage arm is connected with the movable seat through the connecting rod structure and can rotate around the driving shaft, a collapse mechanism is arranged between the movable seat and the fixed seat, the collapse mechanism comprises a transmission screw rod connected with the fixed seat, a transmission nut matched with the transmission screw rod and a nut locking device arranged on the movable seat, the nut locking device comprises a rack, a gear and a locking spring, the gear is engaged with the rack and is arranged on the movable seat and the transmission nut respectively, and the locking spring is used for applying a locking force to the gear; when the abuse force of the automobile exceeds a preset threshold value, the gear rotates against the biasing force of the locking spring until the connecting position is beyond the most distant or nearest position relative to the rack, the biasing force is changed into a release force for driving the gear to continue rotating, the transmission nut is released, and the secondary injury of the passenger caused by the massage movement core in the collision is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of massage equipment technology, specifically to a massage mechanism and a car seat. Background Technology

[0002] With the development of the automotive industry, people's demands for ride comfort are increasing. Seats with built-in massage functions have become a common feature in mid-to-high-end models. These seats use motors to drive massage arms to simulate the kneading and tapping motions of human hands. The massage arms need to apply a certain amount of force to the back of the human body to achieve a massage effect. Therefore, the massage arms and the drive mechanism that drives the massage arms must have sufficient strength and rigidity.

[0003] However, in accidental impact situations such as car collisions, when occupants are forced to sit against the seat back due to inertia, the hard, protruding massage arms can become a "secondary source of injury," causing concentrated impact on the spine and back, posing a safety hazard. To address this issue, the industry has explored various solutions. For example, reducing the overall strength of the massage mechanism allows it to break or deform under impact to absorb energy. However, this method has poor reliability and may fail prematurely due to fatigue or unnecessarily, affecting the normal use of the massage function.

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

[0005] To address the aforementioned issues, this invention provides a massage mechanism and a car seat. The collapsible mechanism in the massage mechanism has a simple structure and reliable response, thereby improving the reliability and real-time performance of passive safety protection.

[0006] This invention provides a massage mechanism for car seats, including a fixed seat, a movable seat, a drive shaft, a massage arm, and a connecting rod. The massage arm is connected to the movable seat through a connecting rod structure and can rotate around the drive shaft. A collapsing mechanism is provided between the movable seat and the fixed seat. The collapsing mechanism includes a transmission screw connected to the fixed seat, a transmission nut cooperating with the transmission screw, and a nut locking device provided on the movable seat. The nut locking device is used to release the transmission nut when the abuse force on the car exceeds a preset threshold, thereby releasing the rotation restriction on the massage arm so that the massage arm collapses to a safe position. The nut locking device includes a rack, a gear, and a locking spring. The gear meshes with the rack and is respectively disposed on the movable seat and the transmission nut. The locking spring is used to apply a locking force to the gear. The locking spring is positioned eccentrically relative to the rotation center of the gear. When the abusive force on the vehicle exceeds a preset threshold, the gear rotates against the biasing force of the locking spring until the connection position passes the furthest or closest position relative to the rack. Then, the biasing force is converted into a release force that drives the gear to continue rotating, thereby releasing the transmission nut.

[0007] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0008] Optionally, the movable seat has a limiting part, and the transmission nut abuts against the limiting part under the biasing force of the locking spring, so that the massage arm is in the massage position.

[0009] Optionally, when the massage arm is in the massage position, the connection position is spaced apart from the rotation axis of the gear along the movement path of the transmission nut.

[0010] Optionally, the rack is fixed to the transmission nut and extends along the movement path of the transmission nut; The gear is rotatably attached to the movable seat about a fixed axis.

[0011] Optionally, there are two racks, and the two racks are respectively disposed on both sides of the transmission nut; The number of gears is two, and each gear meshes with a corresponding rack.

[0012] Optionally, the two ends of the locking spring are respectively connected to the gears; or There are two locking springs, and each locking spring is connected to the movable seat and the corresponding gear.

[0013] Optionally, the massage arm includes a first massage arm and a second massage arm; The linkage structure includes: The first linkage component is rotatably attached to the drive shaft and is linked to the first massage arm; The second linkage component is rotatably attached to the drive shaft and is linked to the second massage arm; The third linkage component is rotatably attached to the movable seat and is linked to the first linkage component and the second linkage component respectively; The movable seat drives the first linkage and the second linkage respectively through the third linkage component, thereby driving the first massage arm and the second massage arm to move.

[0014] Optionally, the third linkage component includes: The first rod, one end of which is rotatably attached to the movable seat, and the other end of which is pivotally connected to the second linkage member; and The second member is pivotally connected to the second linkage member and the first member, respectively; The second member is pivotally connected to the first member at its midpoint.

[0015] Optionally, of the first massage arm and the first linkage member, one has a first limiting slider and the other has a first limiting groove that cooperates with the first limiting slider. Of the second massage arm and the second linkage component, one has a second limiting slider and the other has a second limiting groove that cooperates with the second limiting slider.

[0016] The present invention also provides a car seat, including the above-described car seat massage mechanism.

[0017] This invention discloses a massage mechanism and a car seat. When the massage arm is in the massage position, a locking spring applies a biasing force to the gear. This biasing force keeps the gear pressed against the rack, locking the transmission nut and preventing it from moving axially along the transmission screw. This allows the massage arm to remain in its normal working position under the constraint of the linkage structure. When the abusive force on the car exceeds a preset threshold, the impact force is transmitted through the massage arm and the movable seat to the transmission nut. The transmission nut forces the gear to overcome the biasing force of the locking spring and begin to rotate relative to the rack. During the gear's rotation, the position of the eccentric connection point continuously changes. When this connection point passes the critical position furthest or closest to the rack, the biasing force of the locking spring reverses, changing from a locking force that originally hindered the gear's rotation to a releasing force that drives the gear to continue rotating. This causes the transmission nut to quickly disengage along the transmission screw, thereby releasing the rotation restriction on the massage arm. Guided by the linkage structure, the massage arm collapses to a safe position, completing the passive safety protection action.

[0018] When the massage arm is in the massage position, the eccentrically positioned locking spring consistently applies a locking bias force to the gear, pointing towards the rack, reliably locking the transmission nut and maintaining the massage arm in the set working position, ensuring normal operation of the massage function. When the vehicle experiences a collision or other abusive force exceeding a preset threshold, this eccentric structure causes the spring force to automatically reverse from locking force to release driving force after the gear crosses the critical position. This allows for rapid release of the transmission nut without an additional drive source, enabling the massage arm to quickly collapse to a safe position, effectively preventing secondary injuries to occupants during a collision. The collapse mechanism in this massage mechanism is simple in structure and reliable in response, improving the reliability and real-time performance of passive safety protection. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0020] Figure 1 A schematic diagram of the massage mechanism structure of a car seat in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the massage arm in a safe position within the massage mechanism of a car seat. Figure 3 for Figure 2 A schematic diagram of the structure of the massage mechanism; Figure 4 for Figure 3 A structural schematic diagram of the massage mechanism from another perspective; Figure 5 for Figure 3 A schematic diagram showing the massage arm in a safe position within the massage mechanism. Figure 6 for Figure 3 A schematic diagram of the massage mechanism omitting part of the movable seat and part of the fixed seat; Figure 7 for Figure 6 Schematic diagram of the middle drive unit structure; Figure 8 for Figure 6 Schematic diagram of the middle drive unit structure; Figure 9 for Figure 6 Schematic diagram of the middle section; Figure 10 for Figure 9 Sectional view in; Figure 11 for Figure 10 A schematic diagram of the structure of part A in the diagram; Figure 12 for Figure 9 A cross-sectional view of the second massage arm; Figure 13 for Figure 6 A schematic diagram of the collapse mechanism; Figure 14 for Figure 13 A structural schematic diagram of the central collapse mechanism from another perspective; Figure 15 for Figure 13 A schematic diagram of the collapse mechanism when the massage arm is in the massage position; Figure 16 for Figure 13A schematic diagram of the collapse mechanism when the massage arm is in a near-safe position; Figure 17 for Figure 13 A schematic diagram of the collapse mechanism when the massage arm is in a safe position.

[0021] Explanation of reference numerals in the attached figures: 100. Massage mechanism; 10. Fixing base; 11. Guide rod; 20. Movable seat; 21. Guide groove; 30. Drive shaft; 31. Tilt cam; 40. First massage arm; 41. First arm section; 42. First massage head; 43. First limiting slider; 50. Second massage arm; 51. Second arm section; 52. Second massage head; 53. Rotating part; 531. Second limiting slide groove; 54. Rotating groove; 60. Collapsible mechanism; 61. Transmission screw; 62. Transmission nut; 63. Nut locking device; 631. Rack; 632. Gear; 633. Locking spring; 64. Mounting base; 641. Limiting part; 65. Third motor; 651. Third worm gear; 652. Third worm; 70. Linkage structure; 71. First linkage component; 711. First limiting slide groove; 72. Second linkage component; 721. Second limiting slider; 73. Third linkage component; 731. First rod; 732. Second rod; 80. Drive unit; 801. Output shaft; 802. Eccentric component; 81. First motor; 811. First worm; 812. First worm wheel; 813. Second worm; 814. Second worm wheel; 82. Second motor; 821. First drive wheel; 822. Second drive wheel; 823. Third drive wheel; 824. Fourth drive wheel; 825. First transmission belt; 826. Second transmission belt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] 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.

[0024] 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 invention pertains. The terms "first," "second," and similar terms used in this 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" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These terms are only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] like Figures 1 to 16As shown, this application provides a massage mechanism 100 for car seats, including a fixed base 10, a movable base 20, a drive shaft 30, a massage arm, and a connecting rod. The massage arm is connected to the movable base 20 via a connecting rod structure 70 and can rotate around the drive shaft 30. A collapse mechanism 60 is provided between the movable base 20 and the fixed base 10. The collapse mechanism 60 includes a transmission screw 61 connected to the fixed base 10, a transmission nut 62 cooperating with the transmission screw 61, and a nut locking device 63 provided on the movable base 20. The nut locking device 63 is used to release the transmission nut 62 when the abusive force on the car exceeds a preset threshold, thereby releasing the rotation restriction on the massage arm and allowing the massage arm to collapse to a safe position. The nut locking device 63 includes a rack 631, a gear 632, and a locking spring 633. The gear 632 meshes with the rack 631 and is respectively disposed on the movable seat 20 and the transmission nut 62. The locking spring 633 is used to apply a locking force to the gear 632. The connection position between the locking spring 633 and the gear 632 is eccentrically set relative to the rotation center of the gear 632. When the abuse force on the vehicle exceeds a preset threshold, the gear 632 rotates against the biasing force of the locking spring 633 until the connection position passes the farthest or closest position relative to the rack 631. Then, the biasing force is converted into a release force to drive the gear 632 to continue rotating, thereby releasing the transmission nut 62.

[0027] When the massage arm is in the massage position, the locking spring 633 applies a biasing force to the gear 632, which keeps the gear 632 pressed against the rack 631. The transmission nut 62 is locked and cannot move axially along the transmission screw 61, so that the massage arm can be kept in the normal working position under the constraint of the linkage structure 70. When the abusive force on the car exceeds the preset threshold, the impact force is transmitted through the massage arm and the movable seat 20 to the transmission nut 62. The transmission nut 62 forces the gear 632 to overcome the biasing force of the locking spring 633 and begin to rotate relative to the rack 631. During the rotation of the gear 632, the position of the eccentric connection point continues to change. When the connection point passes the critical position that is farthest or closest to the rack 631, the biasing force of the locking spring 633 reverses, changing from the locking force that originally hindered the rotation of the gear 632 to the releasing force that drives the gear 632 to continue rotating. This causes the transmission nut 62 to quickly disengage along the transmission screw 61, thereby releasing the rotation restriction on the massage arm. Under the guidance of the linkage structure 70, the massage arm collapses to a safe position, completing the passive safety protection action.

[0028] When the massage arm is in the massage position, the eccentrically positioned locking spring 633 consistently applies a locking bias force to the gear 632, pointing towards the rack 631, reliably locking the transmission nut 62 and maintaining the massage arm in the set working position, ensuring the normal operation of the massage function. When the vehicle experiences a collision or other abusive force exceeding a preset threshold, this eccentric structure causes the spring force to automatically reverse from a locking force to a release driving force after the gear 632 crosses the critical position. This allows for rapid release of the transmission nut 62 without an additional drive source, enabling the massage arm to quickly collapse to a safe position, effectively preventing secondary injuries to occupants from the massage mechanism 100 during a collision. The collapse mechanism 60 in this massage mechanism 100 has a simple structure and reliable response; its purely mechanical triggering eliminates the need for an electronic control system, improving the reliability and real-time performance of passive safety protection.

[0029] In this embodiment, as Figures 1 to 6 As shown, the structures of the fixed base 10 and the movable base 20 are not strictly limited. Both the fixed base 10 and the movable base 20 have internal receiving compartments. To limit the movement path of the movable base 20; referring to one embodiment, as... Figure 4 As shown, a guide structure is provided between the movable seat 20 and the fixed seat 10, and the guide structure is configured to guide the movement path of the movable seat 20. The guide structure includes a guide rod 11 and a guide groove 21; one of the guide rod 11 and the guide groove 21 is provided in the fixed seat 10, and the other is provided in the movable seat 20. Specifically, the guide rod 11 is fixed to the fixed seat 10, and the movable seat 20 has a guide groove 21 through which the guide rod 11 passes.

[0030] In this embodiment, as Figures 1 to 6 , Figure 9 , Figure 10 and Figure 12 As shown, the first massage arm 40 includes a first arm portion 41 and a first massage head 42. The first arm portion 41 is rotatably attached to the drive shaft 30; the first massage head 42 is attached to the end of the first arm portion 41 facing away from the drive shaft 30. The second massage arm 50 includes a second arm portion 51 and a second massage head 52. The second arm portion 51 is rotatably attached to the drive shaft 30; the second massage head 52 is attached to the end of the second arm portion 51 facing away from the drive shaft 30. Both the first arm portion 41 and the second arm portion 51 have a rod-like structure.

[0031] In this embodiment, as Figures 1 to 6 , Figure 9 , Figure 10 and Figure 12As shown, the massage mechanism 100 has two sets of massage arms, which are spaced apart along the axial direction of the drive shaft 30. The rotation of the drive shaft 30 synchronously drives the two sets of massage arms to swing, so that the two sets of massage arms move closer or further apart along the axial direction during the swing, thereby realizing the kneading action of the massage mechanism 100 on the user. Each set of massage arms includes at least one first massage arm 40 and one second massage arm 50.

[0032] In this embodiment, as Figures 2 to 7 as well as Figures 9 to 10 As shown, the drive shaft 30 rotates under drive. The drive shaft 30 has an inclined cam 31, and the first massage arm 40 and the second massage arm 50 are rotatably attached to the inclined cam 31, so that the drive shaft 30 drives the first massage arm 40 and the second massage arm 50 to swing through the inclined cam 31, thereby driving the first massage arm 40 and the second massage arm 50 to perform kneading massage actions. The drive shaft 30 is rotatably mounted on the machine body through a structure such as a bearing seat; the inclined cam 31 is sleeved on the outside of the drive shaft 30, and the first massage arm 40 and the second massage arm 50 are both sleeved on the inclined cam 31 and can rotate around the inclined cam 31.

[0033] To drive the drive shaft 30 to rotate; refer to one embodiment, such as Figures 2 to 7 as well as Figures 9 to 10 As shown, the massage mechanism 100 also includes a drive device 80, which includes a first motor 81, a first worm 811, a first worm wheel 812, a second worm 813, and a second worm wheel 814. The first worm 811 is fixedly connected to the drive shaft 30 of the first motor 81, and the first worm 811 meshes with the first worm wheel 812 for transmission. The first worm wheel 812 is linked to the second worm 813, and the second worm 813 meshes with the second worm wheel 814 for transmission. The second worm wheel 814 is fixedly connected to the drive shaft 30. The first motor 81 transmits its rotational power to the drive shaft 30 through a two-stage worm gear transmission, achieving stable driving and precise control of the drive shaft 30. The first motor 81 is fixedly attached to the fixed base 10 by bolts or welding. The first worm wheel 812 is fixedly connected to the second worm 813, enabling the first worm wheel 812 to drive the second worm 813.

[0034] In this embodiment, as Figures 1 to 6 as well as Figure 9As shown, the linkage structure 70 includes a first linkage member 71, a second linkage member 72, and a third linkage member 73. The first linkage member 71 is rotatably attached to the drive shaft 30 and is linked to the first massage arm 40. The second linkage member 72 is rotatably attached to the drive shaft 30 and is linked to the second massage arm 50. The third linkage member 73 is rotatably attached to the movable seat 20 and is linked to both the first linkage member 71 and the second linkage member 72. The movable seat 20 drives the first linkage member and the second linkage member through the third linkage member 73, thereby driving the first massage arm 40 and the second massage arm 50 to move.

[0035] When the movable seat 20 moves, the movable seat 20 drives the third linkage member 73, which is rotatably attached to the movable seat 20, to move synchronously. The third linkage member 73 is linked with the first linkage member 71 and the second linkage member 72, which are rotatably attached to the drive shaft 30, respectively, thereby converting the linear displacement of the movable seat 20 into the rotational motion of the first linkage member 71 and the second linkage member 72. The first linkage member 71 drives the first massage arm 40 and the second linkage member 72 drives the second massage arm 50, so that the two sets of massage arms deflect around the inclined cam 31 on the drive shaft 30, so that the first massage head 42 and the second massage head 52 move away from each other and move closer to each other.

[0036] In this embodiment, as Figures 9 to 11 As shown, of the first massage arm 40 and the first linkage, one has a first limiting slider 43, and the other has a first limiting groove 711 that cooperates with the first limiting slider 43, to prevent the first massage arm 40 from rotating together with the drive shaft 30, ensuring that the drive shaft 30 drives the first massage arm 40 to move only through the tilting cam 31. The extension path of the first limiting groove 711 is approximately parallel to the axis of the drive shaft 30; where approximately parallel means that the included angle between them is approximately parallel within the allowable machining and assembly tolerance range, not requiring strict geometric parallelism. In this embodiment, the first limiting slider 43 is disposed on the first massage arm 40 and located at the end of the first arm portion 41 facing away from the first massage head 42; the second limiting groove 531 is disposed on the first linkage.

[0037] In this embodiment, as Figure 9 as well as Figure 12 As shown, of the second massage arm 50 and the second linkage, one has a second limiting slider 721, and the other has a second limiting groove 531 that cooperates with the second limiting slider 721, to prevent the second massage arm 50 from rotating together with the drive shaft 30, ensuring that the drive shaft 30 drives the second massage arm 50 to move only through the tilting cam 31. In this embodiment, the second limiting slider 721 is disposed on the second linkage, and the second limiting groove 531 is located on the first massage arm 40.

[0038] In this embodiment, as Figure 9 as well as Figure 12 As shown, the second limiting groove 531 extends along the length of the second massage arm 50, and the second limiting slider 721 is a cylindrical structure that extends into the second limiting groove 531. This ensures that the second massage arm 50 and the second linkage have multiple degrees of freedom, thus preventing the second linkage from jamming the second massage arm 50 when the drive shaft 30 drives the second massage arm 50 via the tilting cam 31. Furthermore, the second massage arm 50 has a rotating part 53 that rotates around a set axis, and the second limiting groove is formed in the rotating part 53 and extends along the set axis. Specifically, the second arm part 51 has a rotating groove 54, and the rotating part 53 is rotatably mounted within the rotating groove 54.

[0039] In this embodiment, as Figure 9 As shown, the third linkage member 73 includes a first rod 731 and a second rod 732. One end of the first rod 731 is rotatably attached to the movable seat 20, and the other end is pivotally connected to the second linkage member 72. The second rod 732 is pivotally connected to both the second linkage member 72 and the first rod 731. The second rod 732 is pivotally connected to the first rod 731 at the middle position.

[0040] In this embodiment, as Figure 9 As shown, a portion of the structure of the first linkage, a portion of the structure of the second linkage, a portion of the structure of the first link, and a portion of the structure of the second link constitute a four-bar linkage 70. Specifically, the pivot points between the first linkage and the first link, between the first link and the second link, between the second link and the second linkage, and between the second linkage and the first linkage are sequentially connected end-to-end to form a closed four-bar linkage. This four-bar linkage 70 can convert the motion of the drive shaft 30 and the moving seat into coordinated oscillation between the first and second linkages, thereby ensuring that the first massage arm 40 and the second massage arm 50 maintain a synchronous and regular motion trajectory during oscillation, while improving the motion accuracy and structural stability of the overall transmission mechanism.

[0041] In this embodiment, as Figures 1 to 12 As shown, the drive device 80 also includes an output shaft 801 rotatably mounted on the movable seat 20; one end of the first rod 731 is rotatably attached to the output shaft 801. When the output shaft 801 is configured to drive the first massage arm 40 and the second massage arm 50 to perform massage actions, the output shaft 801 drives the first linkage and the second linkage respectively through the third linkage member 73, thereby driving the first massage arm 40 and the second massage arm 50 to move. The rotational motion of the output shaft 801 is converted into the swinging motion of the first linkage and the second linkage through the first linkage and the second linkage, thereby driving the first massage arm 40 and the second massage arm 50 to perform tapping actions synchronously, while ensuring the smoothness and reliability of motion transmission.

[0042] In this embodiment, as Figures 1 to 12 As shown, the drive shaft 30 and the output shaft 801 can respectively drive the first massage arm 40 and the second massage arm 50 to produce different motion trajectories, thereby realizing different massage actions. When the first massage action is required, the drive shaft 30 rotates. At this time, the first linkage and the second linkage respectively restrict and guide the movement of the first massage arm 40 and the second massage arm 50, thereby simulating a kneading massage action. When it is necessary to switch to the second massage action, the output shaft 801 rotates. The output shaft 801 drives the third linkage 73, which drives the first linkage and the second linkage respectively, thereby driving the first massage arm 40 and the second massage arm 50 to move, thereby simulating a tapping massage action.

[0043] In this embodiment, as Figures 1 to 12 As shown, the rotation axes of the first linkage and the drive shaft 30, as well as the rotation axis of the second linkage and the drive shaft 30, are all coincident with the axis of the drive shaft 30, thus ensuring that the first linkage and the second linkage can rotate stably coaxially with the drive shaft 30. The axes of the drive shaft 30, the output shaft 801, the rotation axes of the first link and the first linkage, the rotation axes of the first link and the second link, and the rotation axes of the second link and the second linkage are all arranged in parallel. This not only allows for structural layout but also ensures the coordination and consistency of the movement of each component during power transmission, avoiding motion interference or jamming caused by axis misalignment.

[0044] In this embodiment, as Figure 6 , Figures 8 to 9 As shown, the output shaft 801 rotates under drive. The output shaft 801 has an eccentric member 802, and a first rod 731 is rotatably attached to the eccentric member 802, so that the output shaft 801 drives the first rod 731 via the eccentric member, thereby driving the first massage arm 40 and the second massage arm 50 to perform a tapping massage action. The output shaft 801 is rotatably mounted on the movable seat 20 via a bearing seat or other structure; the first rod 731 is sleeved on the outside of the eccentric member 802. The eccentric member 802 is either an eccentric wheel sleeved on the outside of the output shaft 801 or an eccentric section fixed to the output shaft 801.

[0045] To drive the output shaft 801 to rotate; refer to one embodiment, such as Figure 6 , Figures 8 to 9As shown, the drive device 80 also includes a second motor 82, a first drive wheel 821, a second drive wheel 822, a third drive wheel 823, a fourth drive wheel 824, a first transmission belt 825, and a second transmission belt 826; the output shaft 801 of the second motor 82 is fixedly connected to the first drive wheel 821, and the first drive wheel 821 is connected to the second drive wheel 822 via the first transmission belt 825; the second drive wheel 822 and the third drive wheel 823 are coaxially arranged, the third drive wheel 823 is connected to the fourth drive wheel 824 via the second transmission belt 826, and the fourth drive wheel 824 is fixedly connected to the output shaft 801 coaxially. The second motor 82 drives the first drive wheel 821 to rotate synchronously; the first drive wheel 821 transmits power to the second drive wheel 822 through the first transmission belt 825, and the second drive wheel 822 drives the third drive wheel 823 to maintain synchronous rotation; the third drive wheel 823 then drives the fourth drive wheel 824 to rotate through the second transmission belt 826; finally, the fourth drive wheel 824 directly drives the output shaft 801 to rotate. The second motor 82 is fixed to the movable seat 20 by bolts or welding; the second drive wheel 822 and the third drive wheel 823 are coaxially fixed.

[0046] In this embodiment, as Figure 6 and Figures 13 to 14 As shown, the collapse mechanism 60 also includes a third motor 65, which directly or indirectly drives the transmission screw 61 to rotate around its axis. The transmission screw 61 has an external thread, and the transmission nut 62 has a threaded hole that engages with the external thread. When the third motor 65 drives the transmission screw 61 to rotate, the transmission nut 62 moves along the axial direction of the transmission screw 61 under the drive of the transmission screw 61, and then pushes the movable seat 20 to translate along a preset guide path through the nut locking device 63.

[0047] The third motor 65 is fixedly mounted on the fixed base 10. The collapsible mechanism 60 also includes a third worm gear 651 and a third worm 652. The third worm 652 is fixedly connected to the output shaft 801 of the third motor 65, and the third worm gear 651 and the third worm 652 mesh and drive each other. The transmission screw 61 is fixedly connected to the third worm 652 and is coaxially arranged. The third motor 65 drives the third worm 652 to rotate through its output shaft 801, and transmits power to the transmission screw 61 through the meshing of the third worm gear 651 and the third worm 652, causing the transmission screw 61 to rotate around its axis, thereby driving the transmission nut 62 to move axially along the transmission screw 61.

[0048] In this embodiment, as Figures 13 to 17 As shown, the movable seat 20 is provided with a mounting base 64, and a sliding groove is formed on the mounting base 64; the transmission nut 62 is slidably disposed in the sliding groove and can slide along the sliding groove. The sliding groove is used to limit the movement path of the transmission nut 62, so that it moves in a preset direction. Among them, the limiting part 641 is located on the mounting base 64.

[0049] In this embodiment, as Figure 6 and Figures 13 to 17 As shown, the movable seat 20 has a limiting part 641. The transmission nut 62 abuts against the limiting part 641 under the biasing force of the locking spring 633, so that the massage arm is in the massage position. When the massage arm is in the massage position, the connection position and the rotation axis of the gear 632 are spaced apart along the movement path of the transmission nut 62, so that the biasing force of the locking spring 633 forms a locking torque on the gear 632, ensuring that the transmission nut 62 is reliably abutted against the limiting part 641, preventing the massage arm from accidentally displacing under non-collapse conditions.

[0050] In this embodiment, as Figures 13 to 17 As shown, rack 631 is fixed to transmission nut 62 and extends along the movement path of transmission nut 62; gear 632 is rotatably attached to movable seat 20 around fixed axis, and gear 632 meshes with rack 631 to lock the axial position of transmission nut 62 under the biasing action of locking spring 633. The number of racks 631 is one or two; the number of gears 632 is one or two. Specifically, there are two racks 631, each located on one side of transmission nut 62; there are two gears 632, each meshing with a corresponding rack 631, thus forming a double locking structure on both sides of transmission nut 62, ensuring reliable axial locking of transmission nut 62 and effectively improving the locking stability and anti-eccentric load capability of collapsible mechanism 60.

[0051] In this embodiment, as Figures 13 to 17 As shown, there are two locking springs 633, each connected to the movable seat 20 and the corresponding gear 632, so that each locking spring 633 independently applies a biasing force to the corresponding gear 632, thereby ensuring that the gear 632 always presses against the rack 631 under the action of the locking spring 633, achieving reliable locking of the transmission nut 62. Of course, in other embodiments, the locking spring 633 is a single piece; the two ends of the locking spring 633 are connected to the corresponding gears 632 to form an elastic biasing force between the two gears 632.

[0052] The following describes the collapse process of the massage mechanism 100: When a car experiences an accident such as a collision, and the transmitted abusive force (impact force) exceeds a preset threshold, the impact force is transmitted through the massage arm to the movable seat 20, and then from the movable seat 20 to the transmission nut 62. The axial thrust on the transmission nut 62 is sufficient to overcome the locking torque applied to the gear 632 by the locking spring 633, forcing the gear 632 to begin rotating relative to the rack 631 fixed to the transmission nut 62. During the rotation of the gear 632, the eccentric connection position between the locking spring 633 and the gear 632 continuously changes; once this connection position crosses the critical position of the farthest (or closest) point relative to the rack 631, the direction of the biasing force of the locking spring 633 is reversed, changing from a locking force that hinders the rotation of the gear 632 to a releasing force that drives the gear 632 to continue rotating. Under the action of this releasing force, the gear 632 accelerates its rotation, quickly releasing the meshing constraint between the gear 632 and the rack 631, thereby releasing the transmission nut 62. The release of the transmission nut 62 releases the axial lock on the movable seat 20, and the movable seat 20 quickly translates along the guide structure on the fixed seat 10 under the action of residual collapsing force. The movement of the movable seat 20 is transmitted through the linkage structure 70, driving the first massage arm 40 and the second massage arm 50 to rotate and collapse to a safe position, so that the massage mechanism 100 can make room for the occupant in time, avoiding secondary injury to the occupant in a collision.

[0053] Once the collision risk has been eliminated, the massage mechanism 100 needs to be restored to its normal working state through a system reset operation; the reset process of the massage mechanism 100 is described below: The third motor 65 starts, driving the transmission screw 61 to rotate. The transmission nut 62 moves axially along the transmission screw 61 under the action of the thread, and synchronously moves the movable seat 20 through the unlocked nut locking device 63 until the movable seat 20 reaches its travel limit position due to the limitation of the fixed seat 10. At this point, the massage arm roughly returns to its massage working position. Subsequently, the third motor 65 continues to drive the transmission screw 61 to rotate. Under the continuous action of the thread thrust, the transmission nut 62 overcomes the biasing force of the locking spring 633, slides relative to the movable seat 20, and resets until the biasing force of the locking spring 633 transforms back into a locking force, reliably locking the transmission nut 62 in the initial locked position, completing the reset.

[0054] like Figures 1 to 17 As shown, the present invention also provides a massage chair, including the massage mechanism 100 as described in the above embodiments.

[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention 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 the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A massage mechanism for car seats, comprising a fixed base, a movable base, a drive shaft, a massage arm, and a connecting rod, wherein the massage arm is connected to the movable base via a connecting rod structure and can rotate around the drive shaft; characterized in that: A collapsing mechanism is provided between the movable seat and the fixed seat. The collapsing mechanism includes a transmission screw connected to the fixed seat, a transmission nut cooperating with the transmission screw, and a nut locking device provided on the movable seat. The nut locking device is used to release the transmission nut when the abuse force on the car exceeds a preset threshold, thereby releasing the rotation restriction on the massage arm so that the massage arm collapses to a safe position. The nut locking device includes a rack, a gear, and a locking spring. The gear meshes with the rack and is respectively disposed on the movable seat and the transmission nut. The locking spring is used to apply a locking force to the gear. The locking spring is positioned eccentrically relative to the rotation center of the gear. When the abusive force on the vehicle exceeds a preset threshold, the gear rotates against the biasing force of the locking spring until the connection position passes the furthest or closest position relative to the rack. Then, the biasing force is converted into a release force that drives the gear to continue rotating, thereby releasing the transmission nut.

2. The massage mechanism for a car seat according to claim 1, characterized in that, The movable seat has a limiting part, and the transmission nut abuts against the limiting part under the biasing force of the locking spring, so that the massage arm is in the massage position.

3. A massage mechanism for car seats according to claim 2, characterized in that, When the massage arm is in the massage position, the connection position and the rotation axis of the gear are spaced apart along the movement path of the transmission nut.

4. A massage mechanism for car seats according to claim 1, characterized in that, The rack is fixed to the transmission nut and extends along the movement path of the transmission nut; The gear is rotatably attached to the movable seat about a fixed axis.

5. A massage mechanism for a car seat according to claim 4, characterized in that, The number of racks is two, and the two racks are respectively disposed on both sides of the transmission nut; The number of gears is two, and each gear meshes with a corresponding rack.

6. A massage mechanism for a car seat according to claim 5, characterized in that, The two ends of the locking spring are respectively connected to the gears; or There are two locking springs, and each locking spring is connected to the movable seat and the corresponding gear.

7. A massage mechanism for a car seat according to claim 1, characterized in that, The massage arm includes a first massage arm and a second massage arm; The linkage structure includes: The first linkage component is rotatably attached to the drive shaft and is linked to the first massage arm; The second linkage component is rotatably attached to the drive shaft and is linked to the second massage arm; The third linkage component is rotatably attached to the movable seat and is linked to the first linkage component and the second linkage component respectively; The movable seat drives the first linkage and the second linkage respectively through the third linkage component, thereby driving the first massage arm and the second massage arm to move.

8. A massage mechanism for a car seat according to claim 7, characterized in that, The third linkage component includes: The first rod, one end of which is rotatably attached to the movable seat, and the other end of which is pivotally connected to the second linkage member; and The second member is pivotally connected to the second linkage member and the first member, respectively; The second member is pivotally connected to the first member at its midpoint.

9. A massage mechanism for a car seat according to claim 7, characterized in that, Of the first massage arm and the first linkage component, one has a first limiting slider and the other has a first limiting groove that cooperates with the first limiting slider. Of the second massage arm and the second linkage component, one has a second limiting slider and the other has a second limiting groove that cooperates with the second limiting slider.

10. A car seat, characterized in that, Including a massage mechanism for a car seat as described in any one of claims 1 to 9.

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