Seat headrest mounting structure, seat and vehicle
By limiting and locking the axial position of the headrest rod and guide sleeve through the limiting and locking structure, the problem of abnormal noise caused by the headrest rod going over the locking structure is solved, and the reliable installation of the headrest is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-03-31
AI Technical Summary
In existing technology, the headrest rod of the seat can easily go over the locking structure, making it impossible to lock, causing abnormal noise and affecting the customer's user experience.
The system employs a limiting structure and a locking structure to restrict and lock the axial positions of the first headrest rod and the first guide sleeve, and the second headrest rod and the second guide sleeve, respectively, to prevent the headrest rod from exceeding the locking position and avoid interference with the seat back.
Ensure the reliability of headrest installation, prevent abnormal noises, and improve the customer's user experience.
Smart Images
Figure CN224060841U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and in particular to a seat headrest mounting structure, a seat, and a vehicle. Background Technology
[0002] Vehicle seat headrests are typically inserted into the seat back via two headrest rods. In related technologies, a locking structure is only provided on one side of the headrest rod. In practice, there is a problem that the headrest rod may be inserted into the seat back beyond the locking structure due to misoperation and fail to lock. After the headrest rod passes the locking structure, it may interfere with the frame of the seat back, causing abnormal noises during vehicle operation and resulting in a poor customer experience. Utility Model Content
[0003] The purpose of this application is to provide a seat headrest mounting structure, a seat, and a vehicle. Through structural optimization, the seat headrest cannot be installed beyond the locking position, thus ensuring reliable installation of the headrest.
[0004] To address the aforementioned technical problems, this application provides a seat headrest mounting structure, including a first headrest rod, a second headrest rod, a first guide sleeve, and a second guide sleeve. The first guide sleeve and the second guide sleeve are both mounted on the seat back, and the first headrest rod and the second headrest rod are both mounted on the headrest. The first headrest rod is slidably connected to the first guide sleeve, and the second headrest rod is slidably connected to the second guide sleeve.
[0005] A limiting structure is provided between the first guide sleeve and the first headrest rod, and the axial relative position of the first headrest rod and the first guide sleeve is limited by the limiting structure;
[0006] A locking structure is provided between the second guide sleeve and the second headrest rod, and the axial relative position of the second headrest rod and the second guide sleeve is locked or unlocked by the locking structure.
[0007] In one feasible solution, the limiting structure includes a limiting piece, a first elastic element, and a limiting groove. The limiting piece is capable of moving radially relative to the first guide sleeve. The first elastic element is disposed between the limiting piece and the first guide sleeve. The limiting groove is disposed in the first headrest rod. When the first headrest rod and the first guide sleeve are in a limited state, the limiting piece is engaged in the limiting groove.
[0008] In one feasible solution, the limiting groove includes a first groove sidewall and a second groove sidewall, the first groove sidewall and the second groove sidewall are arranged along the axial direction of the first headrest rod, the first groove sidewall is a plane facing away from the headrest, the second groove sidewall is an inclined surface facing the headrest, and the end of the second groove sidewall closer to the headrest is closer to the central axis of the first headrest rod than the other end farther away from the headrest.
[0009] In one feasible solution, the first guide sleeve has a first sleeve plate portion at one end facing the headrest, the first sleeve plate portion has a sliding groove, the limiting piece slides in radially with the sliding groove, and both the limiting piece and the first sleeve plate portion have through holes for the first headrest rod to pass through.
[0010] In one feasible solution, the first sleeve plate is provided with a stop protrusion and an abutment protrusion. When the limiting piece is engaged in the limiting groove, the limiting piece abuts against the stop protrusion. One end of the first elastic member is fixedly connected to the limiting piece, and the other end of the first elastic member abuts against the abutment protrusion. The abutment protrusion faces the limiting groove, and the stop protrusion faces away from the limiting groove.
[0011] In one feasible solution, the first guide sleeve has a first cap at one end facing the headrest, the first cap covers the first sleeve plate portion, and the limiting piece and the elastic member are located in the accommodating space formed between the first cap and the first sleeve plate portion.
[0012] In one feasible solution, the locking structure includes a locking plate, a second elastic element, and a locking groove. The locking plate is capable of radial movement relative to the second guide sleeve. The second elastic element is disposed between the locking plate and the second guide sleeve. The locking groove is disposed on the second headrest rod and is a square groove. When the second headrest rod and the second guide sleeve are in a locked state, the locking plate is engaged in the locking groove.
[0013] In one possible embodiment, the second guide sleeve has a receiving cavity at one end facing the headrest, at least a portion of the locking piece and the second elastic member are located in the receiving cavity, and the locking piece is also connected to an operating portion exposed in the receiving cavity.
[0014] In one feasible embodiment, the first headrest rod is slidably inserted into the first guide sleeve, and the second headrest rod is slidably inserted into the second guide sleeve.
[0015] This application embodiment also provides a seat, including a seat back and a headrest, wherein the headrest is installed to the seat back via the seat headrest mounting structure described above.
[0016] This application also provides a vehicle, including a seat, the seat described above.
[0017] The headrest mounting structure provided in this embodiment can be used for a vehicle seat. When installing the headrest, the limiting structure restricts the axial relative position of the first headrest rod and the first guide sleeve. Since both the first and second headrest rods are connected to the headrest, the axial relative position of the second headrest rod and the second guide sleeve is also restricted. This prevents the headrest from failing to lock due to exceeding the locking position between the second headrest rod and the second guide sleeve when installed on the seat back. It also avoids noise caused by excessive sliding of the first and second headrest rods into the seat back, which could interfere with the seat back frame. This solution ensures the reliability of the headrest installation. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the seat headrest mounting structure provided in one embodiment of this application;
[0019] Figure 2 for Figure 1 A partial cross-sectional view of the central limiting structure along the axial direction;
[0020] Figure 3 for Figure 1 A partial cross-sectional view of the central limiting structure in the radial direction;
[0021] Figure 4 for Figure 1 A partial cross-sectional view of the central locking structure along the axial direction.
[0022] Explanation of reference numerals in the attached figures:
[0023] First headrest rod 11, second headrest rod 12
[0024] First guide sleeve 21, first body 211, first plate part 212, slide groove 2121, stop protrusion 2122, abutment protrusion 2123, first cap 213, second guide sleeve 22, second body 221, second plate part 222, second cap 223.
[0025] Headrest 30;
[0026] Limiting structure 40, limiting piece 41, limiting part 411, first elastic element 42, limiting groove 43, first groove sidewall 431, second groove sidewall 432;
[0027] The locking structure 50, locking plate 51, operating part 511, locking part 512, second elastic member 52, and locking groove 53 are included. Detailed Implementation
[0028] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] The ordinal numbers used in this article, such as first and second, are used to distinguish different parts with the same name and do not indicate a specific order or primary / secondary relationship.
[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the seat headrest mounting structure provided in one embodiment of this application.
[0031] This embodiment provides a seat headrest mounting structure that can be applied to vehicle seats. In the vehicle seat structure design, the height of the headrest 30 is adjustable, and the headrest 30 can be installed with the seat back (not shown in the figure) via a headrest rod and a guide sleeve.
[0032] In this embodiment, the seat headrest mounting structure includes a first headrest rod 11, a second headrest rod 12, a first guide sleeve 21, and a second guide sleeve 22. Both the first guide sleeve 21 and the second guide sleeve 22 are mounted on the seat back, and both the first headrest rod 11 and the second headrest rod 12 are mounted on the headrest 30. The first headrest rod 11 is slidably connected to the first guide sleeve 21, and the second headrest rod 12 is slidably connected to the second guide sleeve 22. The sliding direction of the first headrest rod 11 relative to the first guide sleeve 21 is axial, and the sliding direction of the second headrest rod 12 relative to the second guide sleeve 22 is also axial.
[0033] A limiting structure 40 is provided between the first guide sleeve 21 and the first headrest rod 11, and the axial relative position between the first headrest rod 11 and the first guide sleeve 21 is limited by the limiting structure 40; a locking structure 50 is provided between the second guide sleeve 22 and the second headrest rod 12, and the axial relative position between the second headrest rod 12 and the second guide sleeve 22 is locked or unlocked by the locking structure 50.
[0034] In a specific implementation, the first headrest rod 11 is slidably inserted into the first guide sleeve 21, and the second headrest rod 12 is slidably inserted into the second guide sleeve 22.
[0035] This article defines axial and radial directions, where the axial direction is... Figure 1 In the diagram, Z represents the radial direction. Figure 1As shown by D, the insertion direction of the first headrest rod 11 relative to the first guide sleeve 21 is axial. The length directions of both the first headrest rod 11 and the first guide sleeve 21 can be understood as axial. Similarly, the insertion direction of the second headrest rod 12 relative to the second guide sleeve 22 is also axial. The length directions of both the second headrest rod 12 and the second guide sleeve 22 can be understood as axial. Radial can be understood as the direction perpendicular to the axial direction. Axially, the end closer to the headrest 30 is called "upper," and the end farther from the headrest 30 is called "lower." Radially, the direction closer to the central axis of the headrest rod or guide sleeve is "inner," and the direction farther from the central axis of the headrest rod or guide sleeve is "outer." The use of these directional terms is merely for clarity and convenience in describing the technical solution and does not constitute a limitation on the scope of protection.
[0036] In this embodiment, a limiting structure 40 is provided between the first headrest rod 11 connected to the headrest 30 and the first guide sleeve 21 connected to the seat back, and a locking structure 50 is provided between the second headrest rod 12 connected to the headrest 30 and the second guide sleeve 22 connected to the seat back. When the headrest 30 is installed on the seat back, the first headrest rod 11 and the second headrest rod 12 are respectively inserted into the first guide sleeve 21 and the second guide sleeve 22. The limiting structure 40 can limit the depth of the first headrest rod 11 inserted into the first guide sleeve 21. That is, the limiting structure 40 can limit the minimum limit position of the headrest 30 relative to the seat back. It can also be understood that the limiting structure 40 can limit the axial relative position of the first headrest rod 11 and the first guide sleeve 21. The locking structure 50 can lock the axial position of the second headrest rod 12 and the second guide sleeve 22, which can ensure that the relative position of the headrest 30 and the seat back is stable. The locking structure 50 can also release the axial relative position of the second headrest rod 12 and the second guide sleeve 22.
[0037] By adopting the above scheme, when installing the headrest 30, the axial relative position of the first headrest rod 11 and the first guide sleeve 21 can be restricted under the action of the limiting structure 40. Since the first headrest rod 11 and the second headrest rod 12 are both connected to the headrest 30, the relative position of the second headrest rod 12 and the second guide sleeve 22 can also be restricted. In this way, the problem of the headrest 30 not being able to lock when it is installed on the seat back can be prevented because it has passed the locking position of the locking structure 50. At the same time, the problem of abnormal noise caused by the first headrest rod 11 and the second headrest rod 12 sliding excessively towards the seat back and interfering with the frame of the seat back can be avoided. This scheme can ensure the reliability of the headrest 30 installation.
[0038] In the scheme where the first headrest rod 11 is slidably inserted into the first guide sleeve 21 and the second headrest rod 12 is slidably inserted into the second guide sleeve 22, the limiting structure 40 restricts the depth of the first headrest rod 11 inserted into the first guide sleeve 21, and similarly restricts the depth of the second headrest rod 12 inserted into the second guide sleeve 22.
[0039] Please refer to this as well. Figure 2 and Figure 3 , Figure 2 for Figure 1 A partial cross-sectional view of the central limiting structure along the axial direction; Figure 3 for Figure 1 A partial cross-sectional view of the central limiting structure in the radial direction.
[0040] In this embodiment, the limiting structure 40 includes a limiting piece 41, a first elastic element 42, and a limiting groove 43. The limiting piece 41 can move radially relative to the first guide sleeve 21. The first elastic element 42 is disposed between the limiting piece 41 and the first guide sleeve 21, and the limiting groove 43 is disposed in the first headrest rod 11. When the first headrest rod 11 and the first guide sleeve 21 are in a limited state, the limiting piece 41 is engaged in the limiting groove 43. Specifically, a portion of the limiting piece 41 is engaged in the limiting groove 43, and the portion of the limiting piece 41 that can be engaged in the limiting groove 43 is referred to as the limiting part 411.
[0041] After the above settings are configured, during the insertion of the first headrest rod 11 into the first guide sleeve 21, force can be applied to the limiting piece 41, causing the limiting part 411 of the limiting piece 41 to move radially away from the first headrest rod 11. The first elastic member 42 located between the limiting piece 41 and the first guide sleeve 21 accumulates elastic force. When the first headrest rod 11 is inserted into the limiting groove 43 at the position corresponding to the limiting piece 41, the force applied by the first headrest rod 11 to the limiting piece 41 disappears. Under the action of the elastic force of the first elastic member 42, the limiting part 411 of the limiting piece 41 moves radially towards the first headrest rod 11, thereby locking into the limiting groove 43, thus limiting the axial position of the first headrest rod 11 and the first guide sleeve 21.
[0042] In its specific implementation, the limiting groove 43 includes a first groove sidewall 431 and a second groove sidewall 432. The first groove sidewall 431 and the second groove sidewall 432 are arranged along the axial direction of the first headrest rod 11. The first groove sidewall 431 is a plane facing away from the headrest 30, and the second groove sidewall 432 is an inclined surface facing the headrest 30. The end of the second groove sidewall 432 closer to the headrest 30 is closer to the central axis of the first headrest rod 11 than the other end farther from the headrest 30. It can be understood that the opening of the limiting groove 43 is radially outward along the first headrest rod 11, the first groove sidewall 431 is a plane approximately parallel to the radial direction, and the second groove sidewall 432 is an inclined surface with its upper end inclined towards the central axis of the first headrest rod 11.
[0043] After the above settings are configured, during the process of the first headrest rod 11 being inserted axially downward into the first guide sleeve 21, when the limiting groove 43 of the first headrest rod 11 moves to the position corresponding to the limiting piece 41, the limiting part 411 of the limiting piece 41 is radially inserted into the limiting groove 43. At this time, if the first headrest rod 11 is to continue to move axially downward, the limiting part 411 of the limiting piece 41 abuts against the first groove sidewall 431 of the limiting groove 43, thus preventing the first headrest rod 11 from continuing to move downward, thereby limiting the depth of the first headrest rod 11 inserted into the first guide sleeve 21. Combined with the locking structure 50 locking the axial position of the second headrest rod 12 and the second guide sleeve 22, the relative position of the headrest 30 and the seat back can be guaranteed.
[0044] In application, when the headrest 30 needs to be disassembled, the aforementioned limiting groove 43 structure does not require operation of the limiting structure 40. Only the locking structure 50 needs to be operated to release the axial position of the second headrest rod 12 and the second guide sleeve 22. When the headrest 30 is pulled upward, the first headrest rod 11 moves upward relative to the first guide sleeve 21 axially. Because the side wall 432 of the second groove is the aforementioned inclined structure, when the first headrest rod 11 moves upward, the side wall 432 of the second groove will exert force on the limiting piece 41, causing its limiting part 411 to move radially away from the limiting groove 43, releasing the restriction on the first headrest rod 11, so that the first headrest rod 11 can be pulled upward out of the first guide sleeve 21.
[0045] By setting the groove wall of the limiting groove 43, the cooperation between the limiting groove 43 and the limiting piece 41 can only limit the depth of the first headrest rod 11 inserted into the first guide sleeve 21. That is, it only limits the position of the first headrest rod 11 inserted into the first guide sleeve 21. When the first headrest rod 11 is pulled out of the first guide sleeve 21, it is not limited by the limiting piece 41 and the limiting groove 43. In this way, the position of the headrest 30 and the seat back can be locked or released by operating the locking structure 50.
[0046] In some implementations, the first guide sleeve 21 includes a first body 211. The end of the first guide sleeve 21 facing the headrest 30, that is, the upper end of the first guide sleeve 21 is provided with a first plate portion 212, which is located at the upper end of the first body 211.
[0047] The first body 211 and the first plate 212 can be designed as an integral structure or as separate structures, and then fixedly connected by means of bonding, welding, screwing, etc.
[0048] The first plate portion 212 has a sliding groove 2121, and the limiting piece 41 slides in the radial direction with the sliding groove 2121. Both the first plate portion 212 and the limiting piece 41 have through holes through which the first headrest rod 11 passes.
[0049] In this way, the groove 2121 of the first plate part 212 can constrain the position of the limiting piece 41, ensuring the reliability of the limiting piece 41 and the first headrest rod 11 in limiting engagement.
[0050] To allow the limiting piece 41 to slide radially, the radial dimension of the through hole in the limiting piece 41 is larger than the radial dimension of the first headrest rod 11, and the limiting part 411 of the limiting piece 41 is specifically disposed on one side of the limiting groove 43 of the first headrest rod 11. Figure 2 From the perspective shown, the opening of the limiting groove 43 of the first headrest rod 11 faces to the left, and the limiting part 411 of the limiting piece 41 is located on the left side.
[0051] In a specific implementation, the first plate part 212 is provided with a stop protrusion 2122 and an abutment protrusion 2123. When the limiting piece 41 is engaged in the limiting groove 43, that is, when the limiting part 411 of the limiting piece 41 is engaged in the limiting groove 43, the limiting piece 41 abuts against the stop protrusion 2122. One end of the first elastic member 42 is fixedly connected to the limiting piece 41, and the other end of the first elastic member 42 abuts against the abutment protrusion 2123. The abutment protrusion 2123 faces the limiting groove 43, and the stop protrusion 2122 faces away from the limiting groove 43.
[0052] With this configuration, during the insertion of the first headrest rod 11 into the first guide sleeve 21, the limiting portion 411 of the limiting piece 41 moves radially away from the first headrest rod 11. During this process, the first elastic member 42 is compressed, and the limiting piece 41 moves away from the stop protrusion 2122. When the first headrest rod 11 is inserted into the limiting groove 43 and the position of the limiting piece 41 corresponds, under the reset action of the first elastic member 42, the limiting portion 411 of the limiting piece 41 moves radially towards the first headrest rod 11 and is engaged in the limiting groove 43. The limiting piece 41 abuts against the stop protrusion 2122, limiting the movement position of the limiting piece 41. Under the restriction of the first elastic member 42 and the stop protrusion 2122, the limiting piece 41 can be maintained in the position where its limiting portion 411 is engaged in the limiting groove 43, resulting in good reliability.
[0053] In some implementations, the first guide sleeve 21 is provided with a first cap 213 at one end facing the headrest 30. The first cap 213 covers the first sleeve plate portion 212, and the limiting piece 41 and the elastic member 42 are located in the accommodating space formed between the first cap 213 and the first sleeve plate portion 212.
[0054] The first guide sleeve 21 is installed on the back of the seat. The first cap 213 can be located at the top of the seat back. Under the action of the first cap 213 and the seat back, the limiting piece 41 and the elastic member 42 are contained in the accommodating space and are not exposed, so that the seat can have a better appearance.
[0055] The first cap 213 can be fixedly connected to the first sleeve plate 212 by means of snap-fit, screw-fit, or adhesive. To facilitate the cooperation with the first headrest rod 11, the first cap 213 also has a through hole for the first headrest rod 11 to pass through.
[0056] For example, the first elastic element 42 can be a sheet spring.
[0057] Please refer to this as well. Figure 4 , Figure 4 for Figure 1 A partial cross-sectional view of the central locking structure along the axial direction.
[0058] In this embodiment, the locking structure 50 includes a locking piece 51, a second elastic member 52, and a locking groove 53. The locking piece 51 is radially movable relative to the second guide sleeve 22. The second elastic member 52 is disposed between the locking piece 51 and the second guide sleeve 22. The locking groove 53 is disposed on the second headrest rod 12 and is a square groove. When the second headrest rod 12 and the second guide sleeve 22 are in a locked state, the locking piece 51 is engaged in the locking groove 53. Specifically, a portion of the locking piece 51 is engaged in the locking groove 53. Here, the portion of the locking piece 51 that can be engaged in the locking groove 53 is referred to as the locking part 512.
[0059] The locking groove 53 is a square groove, and the two side walls of the locking groove 53 in the axial direction are both planar.
[0060] When the second headrest rod 12 is inserted axially downward into the second guide sleeve 22, force can be applied to the locking piece 51, causing the locking portion 512 of the locking piece 51 to move radially away from the second headrest rod 12. The second elastic member 52 provided between the locking piece 51 and the second guide sleeve 22 accumulates elastic force. When the second headrest rod 12 is inserted into the locking groove 53 at the position corresponding to the locking piece 51, the force applied by the second headrest rod 12 to the locking piece 51 disappears. Under the action of the elastic force of the second elastic member 52, the locking portion 512 of the locking piece 51 moves radially towards the second headrest rod 12, thereby engaging in the locking groove 53, thus limiting the axial position of the second headrest rod 12 and the second guide sleeve 22.
[0061] Because the locking groove 53 is a square groove, the second headrest rod 12 cannot move downward or upward in the axial direction when in the locked position. To remove the headrest 30, the locking structure 50 can be released from the lock between the second headrest rod 12 and the second guide sleeve 22.
[0062] In a specific implementation, the second guide sleeve 22 includes a second body 221. The end of the second guide sleeve 22 facing the headrest 30 is provided with a receiving cavity. At least a portion of the locking piece 51 and the second elastic member 52 are located in the receiving cavity. The locking piece 51 is also connected to an operating part 511 exposed in the receiving cavity.
[0063] The second guide sleeve 22 may have a second plate portion 222 at its upper end, which is located at the upper end of the second body 221. The second body 221 and the second plate portion 222 may be an integral structure or separate structures, and then fixedly connected by means of bonding, welding, screwing, etc.
[0064] The second plate portion 222 may be provided with a sliding groove that slides with the locking piece 51 to constrain the movement of the locking piece 51. The cooperation structure of the second plate portion 222, the locking piece 51 and the second elastic member 52 can be similar to the cooperation structure of the first plate portion 212, the limiting piece 41 and the first elastic member 42 in the aforementioned limiting structure 40, and will not be described again here.
[0065] In some embodiments, the end of the second guide sleeve 22 facing the headrest 30 may be provided with a second cap 223, which covers the second sleeve plate portion 222. A receiving cavity is formed between the second cap 223 and the second sleeve plate portion 222. At least a portion of the locking piece 51 and the second elastic member 52 may be located within the receiving cavity formed between the second cap 223 and the second sleeve plate portion 222. Unlike the aforementioned limiting structure 40, the locking piece 51 is connected to an operating part 511, which is exposed outside the receiving cavity. Thus, in practical applications, the user can apply force to the locking piece 51 through the exposed operating part 511 to release the locking piece 51 from locking the second headrest rod 12.
[0066] by Figure 4 Based on the indicated orientation, the user can push the operating part 511 to the right, causing the locking part 512 of the locking piece 51 to move away from the locking groove 53, thereby releasing the locking of the second headrest rod 12 and the second guide sleeve 22 in the axial position.
[0067] This embodiment also provides a seat, which includes a seat back and a headrest 30. The headrest 30 can be installed with the seat back using the headrest mounting structure described in the foregoing embodiments. This seat has the same technical effects as the aforementioned headrest mounting structure, and will not be repeated here.
[0068] This embodiment also provides a vehicle including the aforementioned seat. Other structures of the seat and the vehicle can be implemented with reference to existing technologies, and will not be repeated here.
[0069] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.
Claims
1. A seat headrest mounting structure characterized by comprising: The headrest includes a first headrest rod (11), a second headrest rod (12), a first guide sleeve (21) and a second guide sleeve (22), the first guide sleeve (21) and the second guide sleeve (22) are installed on a seat back, the first headrest rod (11) and the second headrest rod (12) are installed on a headrest (30); the first headrest rod (11) is in sliding connection with the first guide sleeve (21), and the second headrest rod (12) is in sliding connection with the second guide sleeve (22); A limiting structure (40) is arranged between the first guide sleeve (21) and the first headrest rod (11), and the axial relative position of the first headrest rod (11) and the first guide sleeve (21) is limited by the limiting structure (40); A locking structure (50) is arranged between the second guide sleeve (22) and the second headrest rod (12), and the axial relative position of the second headrest rod (12) and the second guide sleeve (22) is locked or unlocked by the locking structure (50).
2. The headrest mounting structure according to claim 1, characterized by The limiting structure (40) includes a limiting sheet (41), a first elastic member (42) and a limiting groove (43), the limiting sheet (41) can move in the radial direction relative to the first guide sleeve (21), the first elastic member (42) is arranged between the limiting sheet (41) and the first guide sleeve (21), and the limiting groove (43) is arranged on the first headrest rod (11); the first headrest rod (11) and the first guide sleeve (21) are in a limiting state, and the limiting sheet (41) is clamped in the limiting groove (43).
3. The headrest mounting structure according to claim 2, characterized by The limiting groove (43) includes a first groove side wall (431) and a second groove side wall (432), the first groove side wall (431) and the second groove side wall (432) are arranged in the axial direction of the first headrest rod (11), the first groove side wall (431) is a plane facing away from the headrest (30), the second groove side wall (432) is an inclined plane facing the headrest (30), and the end of the second groove side wall (432) close to the headrest (30) is closer to the central axis of the first headrest rod (11) than the other end away from the headrest (30).
4. The headrest mounting structure according to claim 2 or 3, characterized by The first guide sleeve (21) is provided with a first sleeve plate portion (212) at one end facing the headrest (30), the first sleeve plate portion (212) has a sliding groove (2121), the limiting sheet (41) and the sliding groove (2121) are in radial sliding fit, and the limiting sheet (41) and the first sleeve plate portion (212) both have a through hole through which the first headrest rod (11) passes.
5. The headrest mounting structure according to claim 4, characterized by The first sleeve plate part (212) is provided with a limiting piece (41) and a limiting groove (43), the limiting piece (41) is clamped in the limiting groove (43), the limiting piece (41) is in abutment with a stop protrusion (2122), one end of a first elastic member (42) is fixedly connected with the limiting piece (41), the other end of the first elastic member (42) is in abutment with a abutting protrusion (2123), the abutting protrusion (2123) faces the limiting groove (43), and the stop protrusion (2122) faces away from the limiting groove (43).
6. The headrest mounting structure according to claim 4, characterized by The first guide sleeve (21) is provided with a first cap (213) at one end facing the headrest (30), the first cap (213) covers the first sleeve plate part (212), the limiting piece (41) and the elastic member are located in a containing space formed between the first cap (213) and the first sleeve plate part (212).
7. The headrest mounting structure according to any one of claims 1 to 3, characterized by The locking structure (50) comprises a locking piece (51), a second elastic member (52) and a locking groove (53), the locking piece (51) can move along the radial direction relative to the second guide sleeve (22), the second elastic member (52) is arranged between the locking piece (51) and the second guide sleeve (22), the locking groove (53) is arranged on the second headrest rod (12), the locking groove (53) is a square groove, the second headrest rod (12) and the second guide sleeve (22) are in a locked state, and the locking piece (51) is clamped in the locking groove (53).
8. The headrest mounting structure according to claim 7, characterized by The second guide sleeve (22) is provided with a containing cavity at one end facing the headrest (30), at least part of the locking piece (51) and the second elastic member (52) are located in the containing cavity, and the locking piece (51) is further connected with an operation part (511) exposed to the containing cavity.
9. The headrest mounting structure according to any one of claims 1 to 3, characterized by The first headrest rod (11) is slidably inserted into the first guide sleeve (21), and the second headrest rod (12) is slidably inserted into the second guide sleeve (22).
10. A seat, characterized by The seat comprises a seat back and a headrest (30), and the headrest (30) is mounted with the seat back through the seat headrest mounting structure.
11. Vehicle, characterized in that The seat comprises a seat back and a headrest (30), and the headrest (30) is mounted with the seat back through the seat headrest mounting structure.