Low-noise liftable automobile headrest

Abstract

The present application relates to a kind of low-noise liftable car headrest, including liftable shell, headrest support rod and internal support shell, the internal support shell is installed with the headrest support rod of two ends downward extension, the front end surface of the internal support shell is installed with drive motor, the output shaft of the drive motor is installed with the vertical transmission screw rod that can move up and down, the upper and lower ends of the vertical transmission screw rod are all installed with drive push block, the outside of the internal support shell is suspended and installed with liftable shell, the drive push block and liftable shell inside butt joint, the internal support shell and liftable shell do not directly contact, liftable shell is in suspended state, when vertical transmission screw rod rises, two drive push blocks synchronously push liftable shell to rise.The present application has the characteristics of good operating stability, low noise, high structural strength, reduces assembly cost etc..

Description

Technical Field

[0001] This invention relates to the field of automotive headrest technology, and in particular to a low-noise, height-adjustable automotive headrest. Background Technology

[0002] Currently, many new energy vehicles use electric motors as the drive components for their headrests, enabling rapid position adjustment. Conventional height-adjustable headrests typically slide the height-adjustable part onto a fixed mechanism, and then use a motor and lead screw to push the height-adjustable part along the fixed mechanism. This type of headrest operation generates noise from the motor drive, lead screw compression, and sliding of the height-adjustable part, which can affect the driver's comfort. To solve these problems, a low-noise headrest structure needs to be designed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a low-noise adjustable car headrest, which has the characteristics of good operating stability, low noise, high structural strength and reduced assembly cost.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: A low-noise, height-adjustable car headrest is provided, comprising a height-adjustable housing, a headrest support rod, and an internal support housing. The internal support housing contains a headrest support rod extending downwards at both ends. A drive motor is mounted on the front end face of the internal support housing. A vertical transmission screw capable of vertical movement is mounted on the output shaft of the drive motor. Drive push blocks are mounted on both the upper and lower ends of the vertical transmission screw. The height-adjustable housing is suspended outside the internal support housing. The drive push blocks and the height-adjustable housing are internally connected. The internal support housing and the height-adjustable housing are not in direct contact; the height-adjustable housing is in a suspended state. When the vertical transmission screw rises, the two drive push blocks synchronously push the height-adjustable housing upwards.

[0005] In this technical solution, an internal support shell and headrest support rod are installed to facilitate docking with the seat. A drive motor is installed on the internal support shell, which drives a vertical transmission screw. Drive push blocks are installed at both ends of the vertical transmission screw, and these push blocks are docked and fixed to the liftable shell. This allows the vertical transmission screw to control the up-and-down adjustment of the liftable shell's position. Furthermore, there is no direct contact between the liftable shell and the internal support shell, ensuring that the liftable shell operates without noise and guaranteeing stable operation while minimizing noise impact on user comfort.

[0006] Meanwhile, in order to ensure that the cable structure can be connected to the car's power system, a connecting cable is installed inside the headrest support rod. The connecting cable is led out from the upper end of the headrest support rod and connected to the drive motor.

[0007] As a supplement to this technical solution, the front and rear ends of the drive push block are provided with docking extensions extending to one side. The liftable housing includes a front housing and a rear housing. The upper and lower parts of the docking side of the front housing and the rear housing are provided with drive block support parts that dock with the drive push block. The drive block support parts are provided with storage grooves that cover the docking extensions.

[0008] The drive push block is provided with two protrusion structures extending forward and backward. The protrusion structures are covered with elastic rubber. During installation, the protrusion structures are inserted into the storage slot, and the two are interference-fitted. The storage slot is provided with sound-absorbing sponge to ensure that no squeezing noise is generated when driving the headrest.

[0009] As a supplement to this technical solution, a rear decorative cover is installed on the lower rear side of the rear housing, and a lower reinforcing panel is installed on the lower rear side of the front housing. In this technical solution, the structural strength at this location is improved by installing the rear decorative cover and the lower reinforcing panel.

[0010] As a supplement to this technical solution, a lower support panel is installed below the internal support shell and inside the lower part of the liftable shell, which is connected to the lower part of the headrest support rod. Two side docking brackets matching the headrest support rod are symmetrically arranged on the lower front side of the lower support panel. A headrest support rod fixing bracket is installed on one side of the side docking bracket. The side docking bracket and the headrest support rod fixing bracket are fixed together by fasteners. The side docking bracket and the headrest support rod fixing bracket clamp the headrest support rod.

[0011] In this technical solution, a lower support panel is installed to fix the internal support shell for a secondary purpose. The internal support shell and the upper part of the headrest support rod are connected, and the lower support panel is connected and fixed to the lower part of the headrest support rod, thereby ensuring the structural stability of the internal support shell. The side connecting frame and the headrest support rod fixing frame fix the headrest support rod.

[0012] As a supplement to this technical solution, the upper end of the lower support panel is symmetrically arranged with upwardly extending buckle brackets, and the rear side of the inner support shell is arranged with a plug interface that matches the buckle brackets.

[0013] In this technical solution, by setting up a buckle bracket and a plug-in interface, the internal support shell and the lower support panel are flexibly connected, so that the part can have a certain degree of elasticity, thereby ensuring that it can play a certain role in absorbing energy deformation when it is impacted.

[0014] As a supplement to this technical solution, a buffer rib is provided on the upper side of the insertion interface. The upper end of the buffer rib expands to both sides to form an arc surface. A guide rib is provided at the lower end of the buffer rib. The guide rib extends to the upper side of the insertion interface. A notch matching the guide rib is provided in the middle of the upper end of the buckle bracket.

[0015] In this technical solution, buffer ribs are used to limit the insertion length of the buckle bracket. At the same time, two arc surfaces that expand to both sides are used to buffer the buckle bracket, so that the buckle bracket can absorb energy. Meanwhile, the guide ribs can match the notches on the buckle bracket, so that the buckle bracket can slide along the guide ribs.

[0016] When the end of the snap-fit ​​bracket contacts the curved surface, the snap-fit ​​bracket will fork along the curved surface, allowing the snap-fit ​​bracket and the insertion interface to form a further snap-fit.

[0017] As a supplement to this technical solution, the internal support shell includes a front support shell and a rear support shell. The front side of the rear support shell is provided with no less than four forward-extending docking protrusions. The front support shell and the rear support shell are docked and fixed by bolt structure and docking protrusions. Several headrest support rods are arranged at intervals along the edges of both the front support shell and the rear support shell. The headrest support rods are inserted into the headrest support rods.

[0018] In this technical solution, connecting protrusions are provided to facilitate the connection between the front support shell and the rear support shell, and headrest support ribs are provided to fix the headrest support rod, thereby improving the installation firmness of the headrest support rod.

[0019] As a supplement to this technical solution, a ring-shaped protrusion is provided in the middle of the rear side of the front support housing, and reinforcing ribs extending outward are provided on the outer side of the ring-shaped protrusion. A left cable guide port is provided on the left side of the front support housing, and a right cable guide port is provided on the right side of the front support housing.

[0020] In this technical solution, an annular protrusion is used to separate the internal support shell, and a base for arranging reinforcing ribs is also provided. The reinforcing ribs are used to improve the structural strength at this point, and the left and right cable guide ports are provided to facilitate cable lead-out.

[0021] As a supplement to this technical solution, the headrest support rod is provided with a cable channel inside, and two cable inlets are symmetrically arranged on the lower side of the upper end of the headrest support rod. A partition baffle is provided inside the internal support shell near the cable inlets.

[0022] In this technical solution, a cable inlet is provided to allow two cables to extend from the headrest support rod. A partition is used to separate the two cables, ensuring that one end of the cable can be fixed and preventing the cables from getting tangled during the headrest's raising and lowering process.

[0023] As a supplement to this technical solution, a protective chain docking seat is provided on the front left side of the internal support shell, a lower reinforcing panel is installed inside the lower part of the liftable shell, a protective chain structure is installed between the left end of the protective chain docking seat and the lower reinforcing panel, a cable structure is installed inside the protective chain structure, the upper end of the cable structure is introduced into the headrest support rod, a connector is installed on the lower end of the cable structure, and a recessed clearance is provided in the front middle of the lower reinforcing panel.

[0024] In this technical solution, there are two cables. One cable extends from the right cable guide port and connects to the drive motor, while the other cable extends from the left cable guide port to form a cable structure. At the same time, the cable structure is snapped into the protective chain docking seat, and its lower end is inserted into the protective chain structure. By setting the protective chain structure, the cable structure is protected, and the recessed opening is used to facilitate the arrangement of the connector. The connector is connected to the indicator light on the seat.

[0025] Beneficial Effects: This invention relates to a low-noise, height-adjustable car headrest. An internal support housing and headrest support rod are installed for easy docking with the seat. A drive motor is mounted on the internal support housing, which drives a vertical transmission screw. Drive push blocks are installed at both ends of the vertical transmission screw, and these push blocks are fixed to the height-adjustable housing. This allows the vertical movement of the height-adjustable housing to be adjusted as the vertical transmission screw rises or falls. Furthermore, there is no direct contact between the height-adjustable housing and the internal support housing, ensuring noise-free operation and preventing noise from affecting user comfort. It features good operational stability, low noise, high structural strength, and reduced assembly costs. Attached Figure Description

[0026] Figure 1 This is a structural view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a rear view of the present invention; Figure 4 This is a structural view of the drive motor described in this invention; Figure 5 This is a structural view of the protective chain structure and cable structure described in this invention; Figure 6 This is a structural view of the lower support panel described in this invention; Figure 7 This is a structural view of the rear housing and the front housing after they are combined, as described in this invention; Figure 8 This is a structural view of the rear side of the front housing described in this invention; Figure 9 This is a structural view of the front side of the rear housing described in this invention; Figure 10 This is a structural view of the reinforcing rib described in this invention; Figure 11 This is a structural view of the headrest support rod of the present invention; Figure 12 This is a structural view of the side docking frame and headrest support rod fixing frame described in this invention; Figure 13 This is a structural view of the buckle bracket and the insertion interface described in this invention; Figure 14 This is a structural view of the fastener described in this invention; Figure 15 This is a structural view of the buffer rib described in this invention; Figure 16 This is a structural view of the protective chain docking seat described in this invention; Figure 17 This is a schematic diagram of the drive motor described in this invention; Figure 18 This is a partial sectional view of the vertical transmission lead screw before the improvement of this invention; Figure 19 This is a partial sectional view of the vertical transmission lead screw after the modification of the present invention.

[0027] Illustrations: 1. Headrest support rod; 2. Adjustable housing; 3. Internal support housing; 4. Connecting cable; 5. Front housing; 6. Lower reinforced panel; 7. Rear housing; 8. Rear decorative cover; 9. Lower support panel; 10. Vertical transmission screw; 11. Drive motor; 12. Drive push block; 13. Protective chain structure; 14. Cable structure; 15. Recessed opening; 16. Drive block support; 17. Storage slot; 18. Rear support housing; 19. Front support housing; 20. Reinforcing rib assembly; 21. Side wing structure; 22. Docking window; 23. 24. Annular protrusion; 25. Cable inlet; 26. Reinforcing rib; 27. Divider baffle; 28. Right cable guide port; 29. ​​Left cable guide port; 30. Headrest support rod support rib; 31. Connecting protrusion; 32. Side connecting bracket; 33. Headrest support rod fixing bracket; 34. Buckle bracket; 35. Insertion interface; 36. Fastener; 37. Guide rib; 38. Buffer protrusion; 39. Protective chain connecting seat; 40. Motor body; 41. Bevel gear; 42. Screw drive bushing; 43. Driven gear; 44. Toothed thread; 45. Helical thread. Detailed Implementation

[0028] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0029] Embodiments of the present invention relate to a low-noise, height-adjustable car headrest, such as... Figures 1-6 As shown, the device includes a liftable housing 2, a headrest support rod 1, and an internal support housing 3. The headrest support rod 1, extending downwards at both ends, is installed inside the internal support housing 3. A drive motor 11 is installed on the front end face of the internal support housing 3. A vertical transmission screw 10, capable of vertical movement, is installed on the output shaft of the drive motor 11. Drive push blocks 12 are installed on both the upper and lower ends of the vertical transmission screw 10. The liftable housing 2 is suspended outside the internal support housing 3. The drive push blocks 12 and the liftable housing 2 are internally connected. The internal support housing 3 and the liftable housing 2 are not in direct contact. The liftable housing 2 is in a suspended state. When the vertical transmission screw 10 rises, the two drive push blocks 12 simultaneously push the liftable housing 2 upwards.

[0030] In this technical solution, an internal support housing 3 and a headrest support rod 1 are installed to facilitate docking with the seat. A drive motor 11 is installed on the internal support housing 3, enabling the drive motor 11 to drive a vertical transmission screw 10. Drive push blocks 12 are installed at both ends of the vertical transmission screw 10, and the drive push blocks 12 and the liftable housing 2 are docked and fixed together. This allows the vertical transmission screw 10 to control the vertical adjustment of the liftable housing 2 when it rises or falls. Furthermore, there is no direct contact between the liftable housing 2 and the internal support housing 3, ensuring that the liftable housing 2 operates without noise and preventing noise from affecting user comfort.

[0031] Meanwhile, in order to ensure that the cable structure can be connected to the vehicle's power system, a connecting cable 4 is installed inside the headrest support 1. The connecting cable 4 is led out from the upper end of the headrest support 1 and connected to the drive motor 11.

[0032] like Figures 7-9 As shown, as a supplement to this technical solution, the front and rear ends of the drive push block 12 are provided with docking extensions extending to one side. The liftable housing 2 includes a front housing 5 and a rear housing 7. The upper and lower parts of the docking side of the front housing 5 and the rear housing 7 are provided with drive block support parts 16 that dock with the drive push block 12. The drive block support parts 16 are provided with storage grooves 17 that cover the docking extensions.

[0033] The drive push block 12 is provided with two protrusion structures extending forward and backward. The protrusion structures are covered with elastic rubber. When installing, the protrusion structures are inserted into the storage groove 17 with an interference fit. The storage groove 17 is provided with sound-absorbing sponge to ensure that no squeezing noise is generated when driving the headrest.

[0034] As a supplement to this technical solution, a rear decorative cover 8 is installed on the lower rear side of the rear housing 7, and a lower reinforcing panel 6 is installed on the lower rear side of the front housing 5. In this technical solution, the structural strength at this location is improved by installing the rear decorative cover 8 and the lower reinforcing panel 6.

[0035] like Figures 12-14 As shown, as a supplement to this technical solution, a lower support panel 9 is installed below the internal support shell 3 and inside the lower part of the liftable shell 2, which is connected to the lower part of the headrest support rod 1. Two side docking brackets 31 that match the headrest support rod 1 are symmetrically arranged on the lower front side of the lower support panel 9. A headrest support rod fixing bracket 32 ​​is installed on one side of the side docking bracket 31. The side docking bracket 31 and the headrest support rod fixing bracket 32 ​​are fixed together by fasteners 35. The side docking bracket 31 and the headrest support rod fixing bracket 32 ​​clamp the headrest support rod 1.

[0036] In this technical solution, the lower support panel 9 is installed to fix the internal support shell 3 for a secondary purpose. The upper part of the internal support shell 3 and the headrest support rod 1 are connected, and the lower support panel 9 is connected and fixed to the lower part of the headrest support rod 1, thereby ensuring the structural stability of the internal support shell 3. The side connecting frame 31 and the headrest support rod fixing frame 32 fix the headrest support rod 1.

[0037] like Figure 13 As shown, as a supplement to this technical solution, the upper end of the lower support panel 9 is symmetrically arranged with upwardly extending buckle brackets 33, and the rear side of the inner support housing 3 is arranged with a plug interface 34 that matches the buckle brackets 33.

[0038] In this technical solution, by setting up a buckle bracket 33 and a plug interface 34, the internal support shell 3 and the lower support panel 9 form a flexible connection, which enables the part to have a certain elasticity, thereby ensuring that it can play a certain role in absorbing energy deformation when it is impacted.

[0039] like Figure 15 As shown, as a supplement to this technical solution, a buffer rib 37 is provided on the upper side of the insertion interface 34. The upper end of the buffer rib 37 expands to both sides to form an arc surface. A guide rib 36 is provided at the lower end of the buffer rib 37. The guide rib 36 extends to the upper side of the insertion interface 34. A notch matching the guide rib 36 is provided in the middle of the upper end of the buckle bracket 33.

[0040] In this technical solution, a buffer rib 37 is set to limit the insertion length of the buckle bracket 33. At the same time, two arc surfaces that expand to both sides are set to buffer the buckle bracket 33 so that it can absorb energy. Meanwhile, the guide rib 36 can match the notch on the buckle bracket 33 so that the buckle bracket 33 can slide along the guide rib 36.

[0041] When the end of the snap-fit ​​bracket 33 contacts the arc surface, the snap-fit ​​bracket 33 will form a fork along the arc surface, so that the snap-fit ​​bracket 33 and the insertion interface 34 form a further snap-fit.

[0042] like Figure 11 As shown, as a supplement to this technical solution, the internal support shell 3 includes a front support shell 19 and a rear support shell 18. The front side of the rear support shell 18 is provided with no less than four forward-extending docking protrusions 30. The front support shell 19 and the rear support shell 18 are docked and fixed by bolts and docking protrusions 30. Several headrest support rods 29 are arranged at intervals at the edges of the front support shell 19 and the rear support shell 18. The headrest support rod 1 is inserted into the headrest support rod 29.

[0043] In this technical solution, the connecting protrusion 30 is provided to facilitate the connection between the front support shell 19 and the rear support shell 18, and the headrest support rod rib 29 is provided to fix the headrest support rod 1, thereby improving the installation firmness of the headrest support rod 1.

[0044] like Figure 10 As shown, as a supplement to this technical solution, a ring-shaped protrusion 23 is provided in the middle of the rear side of the front support housing 19, and a reinforcing rib 25 extending outward is provided on the outer side of the ring-shaped protrusion 23. A left cable guide port 28 is provided on the left side of the front support housing 19, and a right cable guide port 27 is provided on the right side of the front support housing 19.

[0045] In this technical solution, an annular protrusion 23 is provided to separate the internal support shell 3, and a base for arranging reinforcing ribs 25 is also provided. The reinforcing ribs 25 are provided to improve the structural strength at this location. At the same time, the left cable guide port 28 and the right cable guide port 27 are provided to facilitate cable lead-out.

[0046] As a supplement to this technical solution, the headrest support rod 1 is provided with a cable channel inside, and two cable inlets 24 are symmetrically arranged on the lower side of the upper end of the headrest support rod 1. A partition baffle 26 is provided inside the internal support shell 3 near the cable inlets 24.

[0047] In this technical solution, a cable inlet 24 is provided to facilitate the extension of two cables from the headrest support rod 1. A partition baffle 26 is provided to separate the two cables, ensuring that one end of the cable can be fixed and preventing the cables from getting tangled during the lifting and lowering of the headrest.

[0048] like Figure 16 As shown, as a supplement to this technical solution, a protective chain docking seat 38 is provided on the front left side of the internal support shell 3, a lower reinforcing panel 6 is installed in the lower part of the liftable shell 2, a protective chain structure 13 is installed between the left end of the protective chain docking seat 38 and the lower reinforcing panel 6, a cable structure 14 is installed in the protective chain structure 13, the upper end of the cable structure 14 is introduced into the headrest support rod 1, a connector is installed on the lower end of the cable structure 14, and a recessed clearance 15 is provided in the front middle of the lower reinforcing panel 6.

[0049] In this technical solution, there are two cables. One cable extends from the right cable guide port 27 and connects with the drive motor 11. The other cable extends from the left cable guide port 28 to form a cable structure 14. At the same time, the cable structure 14 is snapped into the protective chain docking seat 38, and its lower end is inserted into the protective chain structure 13. By setting the protective chain structure 13, the cable structure 14 is protected. Meanwhile, the recessed recess 15 is used to facilitate the arrangement of the connector. The connector is connected to the indicator light on the seat.

[0050] like Figure 17 As shown, the drive motor 11 includes a motor body 39, the main shaft of the motor body 39 extends horizontally to the left, a bevel gear 40 is mounted on the main shaft of the motor body 39, a lead screw drive bushing 41 is vertically mounted on the left side of the motor body 39, a driven gear 42 is provided at the upper end of the lead screw drive bushing 41, and the driven gear 42 meshes with the bevel gear 40.

[0051] When the main shaft of the motor body 39 rotates, it drives the bevel gear 40, which in turn drives the driven gear 42 to rotate. The driven gear 42 then drives the lead screw drive bushing 41 to rotate. A vertical transmission lead screw 10 is installed inside the lead screw drive bushing 41. The lead screw drive bushing 41 and the vertical transmission lead screw 10 are connected by threads. When the lead screw drive bushing 41 rotates, it drives the vertical transmission lead screw 10 to move up and down.

[0052] like Figure 18 As shown, the conventional vertical transmission screw 10 has a toothed thread 43 on its outer ring. The toothed thread 43 meshes with the screw drive bushing 41. The screw drive bushing 41 is acted upon by the internal thread, enabling the vertical transmission screw 10 to move up and down. The toothed thread 43 has a very small pitch, requiring a very high rotational speed to achieve rapid lifting and lowering of the vertical transmission screw 10 during operation. However, the motor body 39, which provides the rotational speed, will generate loud noise and high temperature due to the excessive rotational speed, affecting comfort and service life. The toothed thread 43 is also not conducive to headrest height adjustment.

[0053] To solve the above problems, a method such as Figure 19 The spiral thread 44 shown adopts a spiral structure with a circular arc cross-section. It is spirally arranged on the body of the vertical transmission screw 10. The inner ring of the screw drive bushing 41 is provided with a spiral groove that matches the spiral thread 44. The vertical transmission screw 10 is raised and lowered by rotating the screw drive bushing 41. Because of the spiral thread 44, the motor body 39 only needs a normal speed to drive the vertical transmission screw 10 to rise and fall quickly, reducing the noise of the motor body 39 and improving the service life of this structure.

[0054] like Figure 3As shown, side wing structures 21 are provided on both sides of the front shell 5 to improve the structural strength of the front shell 5 and increase the frame area to ensure the comfort of the headrest.

[0055] like Figure 2 As shown, a docking window 22 corresponding to the recessed opening 15 is provided at the lower middle position of the rear housing 7, so that the connector can be led out from the docking window 22.

[0056] like Figure 6 As shown, the lower support panel 9 has a honeycomb-shaped reinforcing rib assembly 20 evenly arranged on its rear end surface, which improves the structural strength of the lower support panel 9.

Claims

1. A low-noise, height-adjustable car headrest, characterized in that: The device includes a liftable housing (2), a headrest support rod (1), and an internal support housing (3). The internal support housing (3) is equipped with a headrest support rod (1) extending downward at both ends. A drive motor (11) is installed on the front end face of the internal support housing (3). A vertical transmission screw (10) that can move up and down is installed on the output shaft of the drive motor (11). Drive push blocks (12) are installed on both the upper and lower ends of the vertical transmission screw (10). The liftable housing (2) is suspended outside the internal support housing (3). The drive push blocks (12) and the liftable housing (2) are internally connected. The internal support housing (3) and the liftable housing (2) are not in direct contact. The liftable housing (2) is in a suspended state. When the vertical transmission screw (10) rises, the two drive push blocks (12) push the liftable housing (2) to rise synchronously. The drive push block (12) is provided with two protrusion structures extending forward and backward. The protrusion structures are wrapped with elastic rubber. The storage groove (17) and the protrusion structures are interference-fitted. The storage groove (17) is provided with sound-absorbing sponge inside. The vertical transmission screw (10) is provided with a helical thread (44), which adopts a helical structure with a circular arc cross section. The inner ring of the screw drive bushing (41) is provided with a helical groove that matches the helical thread (44). Below the internal support shell (3) and inside the lower part of the liftable shell (2), a lower support panel (9) is installed to connect with the lower part of the headrest support rod (1). Two side docking brackets (31) matching the headrest support rod (1) are symmetrically arranged on the lower front side of the lower support panel (9). A headrest support rod fixing bracket (32) is installed on one side of the side docking bracket (31). The side docking bracket (31) and the headrest support rod fixing bracket (32) are fixed together by fasteners (35). The side docking bracket (31) and the headrest support rod fixing bracket (32) clamp the headrest support rod (1) The lower support panel (9) is symmetrically arranged with upwardly extending buckle brackets (33) at the upper end. The inner support shell (3) is arranged with a plug interface (34) matching the buckle bracket (33) at the rear side. The plug interface (34) is provided with a buffer rib (37) on the upper side. The upper end of the buffer rib (37) expands to both sides to form an arc surface. The lower end of the buffer rib (37) is provided with a guide rib (36). The guide rib (36) extends to the upper side of the plug interface (34). The buckle bracket (33) is provided with a notch matching the guide rib (36) at the middle of the upper end.

2. The low-noise adjustable car headrest according to claim 1, characterized in that: The front and rear ends of the drive push block (12) are provided with docking extensions extending to one side. The liftable housing (2) includes a front housing (5) and a rear housing (7). The upper and lower parts of the docking side of the front housing (5) and the rear housing (7) are provided with drive block support parts (16) that dock with the drive push block (12). The drive block support parts (16) are provided with storage grooves (17) that cover the docking extensions.

3. A low-noise adjustable car headrest according to claim 2, characterized in that: The rear housing (7) is fitted with a rear decorative cover (8) on its lower rear side, and the front housing (5) is fitted with a lower reinforcing panel (6) on its lower rear side.

4. A low-noise adjustable car headrest according to claim 1, characterized in that: The internal support shell (3) includes a front support shell (19) and a rear support shell (18). The front side of the rear support shell (18) is provided with no less than four forward-extending docking protrusions (30). The front support shell (19) and the rear support shell (18) are docked and fixed by bolt structure and docking protrusions (30). Several headrest support rods (29) are arranged at intervals at the edges of the front support shell (19) and the rear support shell (18). The headrest support rod (1) is inserted into the headrest support rod (29).

5. A low-noise adjustable car headrest according to claim 4, characterized in that: The front support housing (19) has a ring-shaped protrusion (23) in the middle of its rear side, and a reinforcing rib (25) extending outward is provided on the outer side of the ring-shaped protrusion (23). The front support housing (19) has a left cable guide port (28) on its left side and a right cable guide port (27) on its right side.

6. A low-noise adjustable car headrest according to claim 1, characterized in that: The headrest support rod (1) has a cable channel inside. The headrest support rod (1) has two cable inlets (24) symmetrically arranged on the lower side of the upper end. The internal support shell (3) has a partition baffle (26) near the cable inlets (24).

7. A low-noise adjustable car headrest according to claim 1, characterized in that: A protective chain docking seat (38) is provided on the front left side of the internal support shell (3). A lower reinforcing panel (6) is installed in the lower part of the liftable shell (2). A protective chain structure (13) is installed between the left end of the protective chain docking seat (38) and the lower reinforcing panel (6). A cable structure (14) is installed in the protective chain structure (13). The upper end of the cable structure (14) is introduced into the headrest support rod (1). A connector is installed on the lower end of the cable structure (14). A recessed cavity (15) is provided in the middle of the front side of the lower reinforcing panel (6).

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