Automobile seat mechanical massage device

Abstract

The application discloses a mechanical massage device for a car seat, which effectively realizes the functions of stretching and rotating massage of a massage head, and comprises a fixed shell, massage mechanisms symmetrically arranged inside the fixed shell, a rotatable power sleeve, a first telescopic lead screw threadedly connected to the inside of the power sleeve, a second telescopic lead screw threadedly connected to the inside of the first telescopic lead screw, limiting mechanisms for rotation limiting arranged between the power sleeve and the first telescopic lead screw and between the first telescopic lead screw and the second telescopic lead screw, and a blocking mechanism arranged on the upper side of the second telescopic lead screw; the upper side of the second telescopic lead screw is provided with the massage head, the application has novel structure, ingenious design, simple and convenient operation, effectively facilitates the assembly of the device, reduces the noise during the operation of the device, can realize the actions in two degrees of freedom directions of stretching and rotating massage, and has compact structure, massage diversity and stable operation.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat massage technology and relates to a mechanical massage device for automotive seats. Background Technology

[0002] Massage devices, especially those used in car seats, office chairs, or home sofas, have become important equipment for enhancing user comfort. Existing massage devices are becoming increasingly diversified in function. Among them, massage heads with two motion modes—vertical stretching and pressing perpendicular to the body surface and kneading and rotating tangentially along the body surface—are highly favored because they better simulate human hand massage movements.

[0003] Currently, there are various drive schemes for realizing the extension and rotation of massage heads. Some schemes use independent motors to drive the extension and rotation movements separately, such as using a linear motor or cylinder to achieve extension and another rotary motor to drive the massage head rotation. Although this scheme is simple and direct to control, it suffers from problems such as complex structure, large space occupation, high cost, and high requirements for coordinated control. Other schemes attempt to achieve two degrees of freedom of motion through a single motor combined with a complex transmission mechanism, such as using a combination of cams, linkages, or gear rack mechanisms. However, such mechanical linkage mechanisms often suffer from complex design, many parts, fixed and inflexible motion trajectory, or are prone to impact and high noise when switching at extreme positions, as well as problems such as motion jamming and decreased reliability due to friction after long-term use. In particular, in scenarios where rotary motion is converted into linear motion using threaded pairs, when it is necessary to achieve pure linear motion, pure rotary motion, or a combination of both sequentially or selectively under the drive of a power source, how to design a simple, reliable, smooth-switching mechanical structure that can effectively prevent thread jamming has become a technical problem that urgently needs to be solved in this field.

[0004] Furthermore, many existing massage devices lack adequate protection for their internal transmission components. Dust, fibers, and other foreign objects can easily enter precision threaded pairs or other moving parts, leading to accelerated wear, increased operating resistance, or even jamming, thus affecting service life and user experience. Simultaneously, the collision noise generated when the device switches actions or reaches the end of its stroke is also a significant factor affecting user comfort.

[0005] Therefore, it is necessary to design a mechanical massage device for car seats to solve the above problems. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a mechanical massage device for car seats, which effectively solves the problems in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A mechanical massage device for car seats includes a fixed housing. The fixed housing has massage mechanisms symmetrically arranged on both the left and right sides. Each massage mechanism includes a rotatable power sleeve. The power sleeve is internally threaded with a first telescopic screw, and the first telescopic screw is internally threaded with a second telescopic screw. Limiting mechanisms for rotational limitation are provided between the power sleeve and the first telescopic screw, and between the first telescopic screw and the second telescopic screw. A blocking mechanism for applying rotational resistance to the second telescopic screw is provided on the upper side of the second telescopic screw.

[0009] The upper side of the second telescopic lead screw is provided with a massage head that can move together with the second telescopic lead screw.

[0010] Preferably, the limiting mechanism includes a stop point and a stop block. Stop points are provided on the upper and lower sides of the power sleeve and inside the first telescopic screw. Stop blocks are provided at the upper and lower ends of the first telescopic screw and the lower end of the second telescopic screw. The stop points and the stop blocks cooperate to form a rotation limiting structure.

[0011] Preferably, each of the stops is covered with a rubber coating on the side closest to the corresponding stop point.

[0012] Preferably, the blocking mechanism includes a telescopic bag, with a first fixing plate and a second fixing plate fixedly connected to the upper and lower sides of the telescopic bag, respectively. The second fixing plate is rotatably connected to the upper side of the fixed housing, and the first fixing plate applies rotational resistance to the second telescopic screw through friction.

[0013] Preferably, the upper end of the second telescopic lead screw is fixedly connected to a fixing column, and the massage head is detachably connected to the fixing column by fixing bolts.

[0014] Preferably, a first wear-resistant pad, a butterfly-shaped pad, and a second wear-resistant pad are arranged sequentially from top to bottom between the massage head and the first fixed plate, and the first wear-resistant pad, the butterfly-shaped pad, and the second wear-resistant pad are all rotatably connected to the fixed column.

[0015] Preferably, a motor assembly is installed inside the fixed housing, and the motor assembly applies rotational power to each of the power sleeves through a reduction mechanism.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention has a blocking mechanism. By setting the blocking mechanism, rotational resistance can be continuously applied to the second telescopic lead screw, thereby facilitating the transition of the massage head between extension and rotation.

[0018] 2. The present invention has a limiting mechanism, which can solve the problem that the friction generated by the threaded connection is too great after the massage head is extended or retracted to its maximum position, causing the massage head to be unable to extend or retract normally.

[0019] 3. The present invention features rubber coating, which solves the problem of collision noise caused when the first and second telescopic screws are limited in their longitudinal movement to the limit position, thereby increasing the quietness of the device during operation and improving the user experience of the occupants.

[0020] 4. The present invention has a telescopic bag, which not only solves the problem that the grease used for lubrication of the first telescopic screw and the second telescopic screw will be thrown out and dirty the seat after working for a long time, but also avoids the risk of other foreign objects inside the seat being pulled in during the operation of the device, which would damage the massager.

[0021] 5. This invention extends the effective extension stroke of the massage head and increases the massage depth by setting a two-stage progressive extension and retraction mechanism with a first and a second telescopic lead screw, without increasing the overall size of the device or changing the installation dimensions of the fixed housing. This allows it to adapt to the massage needs of different seat areas. In addition, the use of nested threaded transmission provides higher precision and smaller transmission gaps, effectively avoiding the problems of transmission jamming, shaking, and misalignment caused by excessive length when using a single-stage lead screw, resulting in smoother and more stable massage extension and retraction movements. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of the telescopic bag in this invention.

[0025] Figure 4 This is an exploded structural diagram of the butterfly-shaped gasket location in this invention.

[0026] Figure 5 This is a schematic diagram of the internal structure of the massage head in this invention.

[0027] Figure 6 This is a schematic diagram showing the position of the second stop point in this invention.

[0028] Figure 7 This is a schematic diagram showing the position of the first blocking point in this invention.

[0029] Figure 8 This is a schematic diagram showing the position of the third stop point in this invention.

[0030] Figure 9 This is a schematic diagram from the lower side of the power sleeve in this invention.

[0031] In the diagram: 1. Fixed housing; 2. Massage head; 3. Power sleeve; 4. First telescopic lead screw; 5. Second telescopic lead screw; 6. Limiting mechanism; 7. Fixed column; 8. First fixed washer; 9. Socket hexagon hole; 10. Socket hexagon slot; 11. Fixing bolt; 12. Massage protrusion; 13. Blocking mechanism; 14. Telescopic bag; 15. First fixed plate; 16. Second fixed plate; 17. First wear-resistant washer; 18. Butterfly-shaped washer; 19. Second wear-resistant washer; 20. Clearance groove; 21. Limiting ring; 22. First stop point; 23. First stop block; 24. Second stop point; 25. Second stop block; 26. Third stop point; 27. Third stop block; 28. Blocking groove; 29. ​​Fixed ring; 30. Rubber coating; 31. Motor assembly; 32. Worm gear; 33. Worm wheel; 34. Small gear; 35. Large gear. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The following is in conjunction with the appendix Figures 1 to 9 The specific embodiments of the present invention will be described in further detail below.

[0034] Depend on Figures 1 to 9 As shown, the present invention includes a fixed housing 1, and two massage heads 2 are provided on the upper side of the fixed housing 1. In order to realize the extension and rotation massage functions of the massage heads 2, a massage mechanism is provided symmetrically on the left and right sides inside the fixed housing 1. Each massage head 2 is provided on the upper side of the corresponding massage mechanism. The massage mechanism is used to drive the massage head 2 to move longitudinally to realize the extension function, and is also used to drive the massage head 2 to rotate horizontally to realize the rotation massage function.

[0035] Furthermore, each massage mechanism includes a rotatable power sleeve 3, with a first telescopic screw 4 internally threadedly connected to the power sleeve 3, and a second telescopic screw 5 internally threadedly connected to the first telescopic screw 4; a limiting mechanism 6 for rotation limiting is provided between the power sleeve 3 and the first telescopic screw 4, and between the first telescopic screw 4 and the second telescopic screw 5.

[0036] Specifically, the power sleeve 3 has an internal thread, the first telescopic screw 4 is a hollow sleeve structure with internal and external threads on its inner and outer sides respectively, the power sleeve 3 is coaxially fitted on the outside of the first telescopic screw 4 and connected by threads; the second telescopic screw 5 has an external thread on its outer side, the first telescopic screw 4 is coaxially fitted on the outside of the second telescopic screw 5 and connected by threads.

[0037] Furthermore, to facilitate assembly, a fixed post 7 is integrally formed and fixedly connected to the upper end of the second telescopic screw 5. The fixed post 7 is an external hexagonal column structure. A first fixed washer 8 is fitted on the outer side of the fixed post 7. An internal hexagonal hole 9 that matches the shape of the fixed post 7 is opened in the middle of the first fixed washer 8, so that the second telescopic screw 5 can drive the first fixed washer 8 to move together through the fixed post 7. An internal hexagonal groove 10 is opened in the middle of the lower end of the massage head 2. A countersunk hole communicating with the internal hexagonal groove 10 is opened at the upper end of the massage head 2. A fixing bolt 11 is threadedly connected to the upper end of the fixed post 7. During the process of the massage head 2 and the second telescopic screw 5, the fixing bolt 11 is threaded through the countersunk hole and the first fixed washer 8 and then threadedly connected to the fixing bolt 11. After installation, the external hexagonal structure on the outer side of the fixed post 7 applies a rotational torque to the massage head 2.

[0038] In addition, the upper end of the massage head 2 is provided with a plurality of massage protrusions 12 of different heights for massaging the occupants. In this embodiment, the number of massage protrusions 12 is 4.

[0039] Furthermore, in order to enable the extension and retraction function of the massage head 2, a blocking mechanism 13 is provided on the upper side of the second extension screw 5 to apply rotational resistance to the second extension screw 5.

[0040] Specifically, the blocking mechanism 13 includes a telescopic bag 14, a first fixing plate 15, and a second fixing plate 16. The first fixing plate 15 and the second fixing plate 16 are respectively fixedly connected to the upper and lower sides of the telescopic bag 14 by bolts.

[0041] The fixed housing 1 includes an upper housing and a lower housing, which are detachably connected by snaps and / or bolts. The upper end face of the upper housing has a rotating hole on each side symmetrically. Each power sleeve 3 is coaxially rotatably connected inside the corresponding rotating hole. The upper side of each rotating hole is fixedly connected to the second fixed plate 16 by bolts. The first fixed plate 15 has a round hole in the middle, so that the first fixed plate 15 can be fitted into the middle of the fixed column 7 and can rotate relative to the fixed column 7 to apply rotational resistance to the first fixed pad 8. Since the first fixed pad 8 cannot rotate relative to the fixed column 7, the first fixed plate 15 can apply rotational resistance to the fixed column 7 and the second telescopic screw 5.

[0042] Specifically, the telescopic bag 14 assembly can stretch longitudinally and has strong anti-torsion performance. Its cross-section is multiple repeating W shapes. The telescopic bag 14 is made of polymer materials, such as rigid plastic and rubber, so that the telescopic bag 14 has a high compression capacity and can stretch longitudinally. The telescopic bag 14 also has a certain anti-torsion strength, so that the telescopic bag 14 can stretch but cannot twist.

[0043] By setting the telescopic bag 14, it has anti-torsion characteristics, which can overcome the frictional torque generated by the mechanism after the butterfly gasket 18 is compressed and deformed without deformation. It also has telescopic characteristics, which can be compressed and extended along the first telescopic screw 4 and the second telescopic screw 5 after axial translation. It can also wrap the entire structure of the first telescopic screw 4 and the second telescopic screw 5, thereby preventing foreign objects from entering the internal and external threads and causing the threaded connection to jam.

[0044] Furthermore, in order to apply stable rotational resistance to the second telescopic screw 5, a first wear-resistant pad 17, a plurality of butterfly pads 18 and a second wear-resistant pad 19 are arranged sequentially from top to bottom between the first fixed plate 15 and the first fixed pad 8. A round hole is opened in the middle of the first wear-resistant pad 17, the plurality of butterfly pads 18 and the second wear-resistant pad 19 so that they can rotate relative to the fixed column 7.

[0045] Among them, the butterfly-shaped washer 18 is a butterfly-shaped spring washer, and the first wear-resistant washer 17 and the second wear-resistant washer 19 are made of wear-resistant material; during the assembly process of the massage head 2 and the second telescopic screw 5, by rotating the fixing bolt 11, the massage head 2 will move downward relative to the second telescopic screw 5, thereby causing the lower end of the massage head 2 to press down on the first fixing washer 8. Since the lower side of the first fixing plate 15 is provided with a second fixing washer 36 fitted on the outside of the second telescopic screw 5, and the lower side of the second fixing washer 36 abuts against the upper end face of the second telescopic screw 5, when the fixing bolt 11 is tightened, the distance between the first fixing washer 8 and the second fixing washer 36 will be shortened, thereby compressing and deforming the butterfly-shaped washer 18;

[0046] Therefore, after the massage head 2 is installed, the butterfly pad 18 will continuously apply a force that moves away from each other between the first wear-resistant pad 17 and the second wear-resistant pad 19. Since the first fixing plate 15 will not rotate relative to the fixed housing 1 under the action of the telescopic bag 14, when the second telescopic screw 5 rotates, it can apply rotational resistance to the fixed column 7 through the friction between the first fixing plate 15 and the second wear-resistant pad 19, and the friction between the first wear-resistant pad 17 and the first fixing pad 8, and thus apply rotational resistance to the second telescopic screw 5. At this time, under the action of friction, the first wear-resistant pad 17 and the fixed column 7 do not rotate relative to each other, while the butterfly pad 18 and the second wear-resistant pad 19 can rotate relative to the fixed column.

[0047] Furthermore, the limiting mechanism 6 specifically includes a first limiting mechanism 6 disposed at the lower end of the first telescopic screw 4, a second limiting mechanism 6 disposed at the upper end of the first telescopic screw 4, and a third limiting mechanism 6 disposed at the lower end of the second telescopic screw 5.

[0048] Wherein: the first limiting mechanism 6 is used to limit the rotation of the first telescopic screw 4 to the highest limit position relative to the power sleeve 3; the second limiting mechanism 6 is used to limit the rotation of the first telescopic screw 4 to the lowest limit position relative to the power sleeve 3; and the third limiting mechanism 6 is used to limit the rotation of the second telescopic screw 5 to the highest limit position relative to the first telescopic screw 4.

[0049] Furthermore, each limiting mechanism 6 includes a stop point and a stop block; a clearance groove 20 is provided on the upper and lower sides of the power sleeve 3, and a limiting ring 21 is fixedly connected to the upper and lower ends of the first telescopic screw 4 by interference fit;

[0050] Specifically, the first limiting mechanism 6 includes a first stop 22 and a first stop 23. The first stop 22 is integrally formed and fixedly connected to the inside of the clearance groove 20 on the lower side of the power sleeve 3. The first stop 23 is integrally formed and fixedly connected to the outside of the limiting ring 21 at the lower end of the first telescopic screw 4. When the first stop 22 contacts the first stop 23, the power sleeve 3 will drive the first telescopic screw 4 to rotate together.

[0051] The second limiting mechanism 6 includes a second stop 24 and a second stop 25. The second stop 24 is integrally formed and fixedly connected to the inside of the clearance groove 20 on the upper side of the power sleeve 3. The second stop 25 is integrally formed and fixedly connected to the outside of the limiting ring 21 at the upper end of the first telescopic screw 4. When the second stop 24 contacts the second stop 25, the power sleeve 3 will drive the first telescopic screw 4 to rotate together.

[0052] The third limiting mechanism 6 includes a third stop 26 and a third stop 27. The first telescopic screw 4 has a blocking groove 28 inside. The third stop 26 is integrally formed and fixedly connected to the upper end face of the blocking groove 28. The lower end of the second telescopic screw 5 is interference-fitted and fixedly connected to a fixing ring 29. The third stop 27 is integrally formed and fixedly connected to the outside of the fixing ring 29. When the third stop 26 contacts the third stop 27, the first telescopic screw 4 and the second telescopic screw 5 will rotate together.

[0053] Furthermore, one side of the first stop block 23, the second stop block 25, and the third stop block 27 is glued with a coating 30. The coating 30 is made of soft rubber, which can eliminate the noise caused by the collision when the stop block comes into contact with the stop point. In addition, in order to fix the coating 30 more stably, each stop block has a notch on the side near the corresponding stop point, which can increase the installation contact surface of the soft rubber coating 30 when it is covered or installed, making the covering and bonding connection more secure.

[0054] By setting the blocking mechanism 13, rotational resistance can be continuously applied to the second telescopic screw 5. Therefore, when the power sleeve 3 needs to rotate unidirectionally to drive the massage head 2 upward, the friction of the threaded connection between the power sleeve 3 and the first telescopic screw 4 will first drive the first telescopic screw 4 to rotate. Since the second telescopic screw 5 has rotational resistance under the action of the blocking mechanism 13, when the first telescopic screw 4 rotates, the second telescopic screw 5 will move linearly due to the friction caused by the pre-tightening of its top butterfly-shaped washer 18, driving the massage head 2 to rise vertically. When the second telescopic screw 5 moves upward relative to the first telescopic screw 4 to its maximum... When the position is limited, the third limiting mechanism 6 will take effect to limit the rotation between the second telescopic screw 5 and the first telescopic screw 4. The friction force brought by the pre-tightening of the butterfly gasket 18 will be transmitted to the first telescopic screw 4 through the second telescopic screw 5. The first telescopic screw 4 will rise vertically relative to the power sleeve 3, driving the massage head 2 to rise and fall twice until the first telescopic screw 4 also moves to the limit position relative to the power sleeve 3, so that the first limiting mechanism 6 cooperates. At this time, when the power sleeve 3 continues to rotate in one direction, the power sleeve 3, the first telescopic screw 4 and the second telescopic screw 5 will rotate together, driving the massage head 2 to perform a rotating massage action.

[0055] Then, when the power sleeve 3 rotates in the opposite direction, it will drive the massage head 2 to descend. At this time, because the friction provided by the pre-tightening force of the butterfly pad 18 on the second telescopic screw 5 is always present, it will first make a linear motion until the first fixed plate 15 contacts the upper end of the first telescopic screw 4. At this time, the first telescopic screw 4 will start to make a linear motion due to the friction transmitted by the butterfly pad 18 through the second telescopic screw 5. When the first telescopic screw 4 moves to the limit position, the second limit mechanism 6 is in the engagement state, and the first telescopic screw 4 and the second telescopic screw 5 stop the linear motion together and start to make a circular motion together with the power sleeve 3.

[0056] It should be noted that in this embodiment, each limiting mechanism 6 has three stops and blocks, which are evenly distributed in a circle. In addition, the thickness T of the stops and blocks along the axial direction of the first telescopic screw 4 is positively correlated with the lead S of the threaded connection. That is, in an ideal state, T < S / 3. Considering the length of the stops and blocks along the circumferential direction, in this embodiment, T ≤ S / 3 / 2. That is, if the lead S of the threaded connection is 3mm, the thickness T should not be greater than 0.5mm.

[0057] By setting a limiting mechanism 6, the problem that the friction generated by the threaded connection after the massage head 2 extends or retracts to its maximum position can be solved, which prevents the massage head 2 from extending or retracting normally.

[0058] Furthermore, a motor assembly 31 is fixedly connected inside the fixed housing 1. The motor assembly 31 is a dual-shaft motor, and its two output shafts are respectively connected to the power sleeve 3 through a reduction mechanism. Specifically, each output shaft is coaxially fixedly connected to a worm gear 32 through a key connection. Each worm gear 32 has a worm wheel 33 meshing on its side. Each worm wheel 33 has a small gear 34 integrally formed on its upper side. Each small gear 34 has a large gear 35 meshing on its side. Each large gear 35 is fixedly fitted on the outside of the corresponding power sleeve 3 through an interference fit. The worm wheel 33 and the small gear 34 are rotatably connected to the fixed housing 1 through a pin and a bearing. The power sleeve 3 is rotatably connected to the rotating hole through a bearing.

[0059] After the motor assembly 31 is started, the two worm gears 32 drive the worm wheel 33 to rotate, which in turn drives the large gear 35 to rotate through the small gear 34, thereby driving the two power sleeves 3 to rotate together, and thus driving the massage mechanism to operate.

[0060] It should be noted that since the two massage mechanisms are arranged symmetrically from left to right, the positions and rotation directions of the two worm gears 32, worm wheel 33, pinion 34, and gear 35 are also arranged symmetrically from left to right. As a result, when the device is in operation, the two second telescopic screws 5 rotate in opposite directions, which can drive the two massage heads 2 to rotate in opposite directions to massage the occupant.

[0061] This invention features a novel structure, ingenious design, and simple and convenient operation. Through this design, the extension and rotation massage functions of the massage head 2 are effectively realized, facilitating device assembly and reducing noise during device operation. When using only one power source, it can achieve two degrees of freedom of movement in the mechanical massage direction, namely, autonomous extension and rotation massage. It balances the compactness of the device structure, the diversity of massage functions, and the stability of operation, and is suitable for the narrow installation space inside car seats, thus improving the practicality of the device.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanical massage device for a car seat, comprising a fixed housing, wherein massage mechanisms are symmetrically arranged on both sides inside the fixed housing, characterized in that: The massage mechanism includes a rotatable power sleeve, with a first telescopic screw connected to the inside of the power sleeve, and a second telescopic screw connected to the inside of the first telescopic screw. Limiting mechanisms for rotational limitation are provided between the power sleeve and the first telescopic screw, and between the first telescopic screw and the second telescopic screw. A blocking mechanism for applying rotational resistance to the second telescopic screw is provided on the upper side of the second telescopic screw. The upper side of the second telescopic lead screw is provided with a massage head that can move together with the second telescopic lead screw.

2. The mechanical massage device for a car seat according to claim 1, characterized in that: The limiting mechanism includes a stop point and a stop block. Stop points are provided on the upper and lower sides of the power sleeve and inside the first telescopic screw. Stop blocks are provided at the upper and lower ends of the first telescopic screw and the lower end of the second telescopic screw. The stop points and the stop blocks cooperate to form a rotation limiting structure.

3. The mechanical massage device for a car seat according to claim 2, characterized in that: Each of the stops is covered with a rubber coating on the side closest to the corresponding stop point.

4. The mechanical massage device for a car seat according to claim 1, characterized in that: The blocking mechanism includes a telescopic bag, with a first fixing plate and a second fixing plate fixedly connected to the upper and lower sides of the telescopic bag, respectively. The second fixing plate is rotatably connected to the upper side of the fixed housing, and the first fixing plate applies rotational resistance to the second telescopic screw through friction.

5. A mechanical massage device for a car seat according to claim 4, characterized in that: The upper end of the second telescopic lead screw is fixedly connected to a fixed column, and the massage head is detachably connected to the fixed column by a fixing bolt.

6. A mechanical massage device for a car seat according to claim 5, characterized in that: A first wear-resistant pad, a butterfly-shaped pad, and a second wear-resistant pad are arranged sequentially from top to bottom between the massage head and the first fixed plate. The first wear-resistant pad, the butterfly-shaped pad, and the second wear-resistant pad are all rotatably connected to the fixed column.

7. A mechanical massage device for a car seat according to claim 1, characterized in that: The fixed housing is equipped with a motor assembly, which applies rotational power to each of the power sleeves through a reduction mechanism.

Images