Seat headrest adjusting structure and vehicle

Abstract

The application discloses a seat headrest adjusting structure and a vehicle. The seat headrest adjusting structure comprises a guide rod and a headrest guide sleeve. The headrest guide sleeve is arranged to be fixed on a seat. The guide rod is arranged to pass through the headrest guide sleeve and is movable relative to the headrest guide sleeve. A first end of the guide rod is arranged to extend out of the headrest guide sleeve and forms a free end. The first end of the guide rod is arranged to be foamed to form a headrest. A locking mechanism is arranged on the headrest guide sleeve. The locking mechanism is arranged to lock the guide rod after the guide rod is moved to a set position. The seat headrest adjusting structure disclosed by the application has simple structure. The height of the headrest can be adjusted through the relative movement of the guide rod and the headrest guide sleeve. When the seat headrest adjusting structure is replaced, repaired or reformed, only the headrest guide sleeve is needed, so that the repair and replacement cost is reduced. The locking mechanism is arranged on the headrest guide sleeve, so that sufficient space is reserved for foaming, and the foaming effect of the headrest is improved.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of vehicle interior structures, and in particular to a seat headrest adjustment structure and a vehicle. Background Technology

[0002] To ensure the comfort of drivers and passengers, car seats are generally equipped with headrests to support their heads when they lean back, thus improving comfort. To accommodate passengers of different heights, headrests usually have height adjustment functions for practicality.

[0003] However, existing headrests have many problems. The height adjustment mechanism of the headrest is complex and often occupies the foam space of the headrest, affecting the comfort of the headrest. Summary of the Invention

[0004] This application provides a seat headrest adjustment structure and vehicle, which is simple in structure, easy to adjust, and does not affect the foam space of the headrest.

[0005] This application provides a seat headrest adjustment structure, which includes a guide rod and a headrest guide sleeve. The headrest guide sleeve is fixed to the seat, and the guide rod passes through the headrest guide sleeve and can move relative to the headrest guide sleeve. The first end of the guide rod extends out of the headrest guide sleeve and forms a free end. The first end of the guide rod is used to foam to form a headrest.

[0006] The headrest guide sleeve is provided with a locking mechanism, which is configured to lock the guide rod after the guide rod moves to a set position.

[0007] In an exemplary embodiment, the headrest guide sleeve includes a mounting plate and a first column and a second column connected to the mounting plate, wherein at least one of the first column and the second column is provided with the locking mechanism;

[0008] Both the first column and the second column are provided with through holes for the guide rod to pass through.

[0009] In one exemplary embodiment, the guide rod is provided with a plurality of locking slots along the height direction, and the headrest guide sleeve is provided with a communicating slot;

[0010] The locking mechanism includes a limiting member installed in the communicating groove and movable in directions close to and away from the guide rod, so that the limiting member is at least partially engaged in or disengaged from the locking groove to lock or release the guide rod.

[0011] In an exemplary embodiment, the locking mechanism further includes an elastic element, the limiting element is provided with a mounting portion, the headrest guide sleeve is provided with a mating portion, one end of the elastic element is connected to the mounting portion, and the other end is connected to the mating portion;

[0012] The elastic element is configured to provide a restoring force that causes the limiting element to engage with the locking slot.

[0013] In an exemplary embodiment, the limiting member is provided with a protrusion extending along the through direction of the communicating groove, the protrusion forming the mounting portion, and one end of the elastic member is sleeved on the outside of the protrusion;

[0014] An installation groove is provided on the side wall of the connecting groove, and the installation groove forms the mating part. The other end of the elastic member extends into the installation groove.

[0015] In one exemplary embodiment, the seat headrest adjustment structure further includes a decorative element sleeved on the outside of the headrest guide sleeve.

[0016] In one exemplary embodiment, the decorative element includes a decorative front cover and a decorative back cover, the decorative front cover being fastened to the decorative back cover to cover the headrest guide sleeve;

[0017] The decorative back cover is fixedly connected to the seat.

[0018] In an exemplary embodiment, the decorative front cover or the decorative rear cover is provided with a through hole, and the limiting member is located in the through hole or partially extends out of the through hole to form a pressing part. The pressing part is configured to: after being pushed, drive the limiting member to move so that the limiting member disengages from the locking groove to release the guide rod.

[0019] In one exemplary embodiment, the decorative rear cover is provided with a first connecting plate, and the first connecting plate is provided with a first connecting hole; the mounting plate is provided with a second connecting hole; and the seat is provided with a third connecting hole.

[0020] Fasteners are inserted into the first connecting hole, the second connecting hole, and the third connecting hole to securely connect the decorative back cover, the headrest guide sleeve, and the seat.

[0021] In one exemplary embodiment, the limiting member is an annular component, and the limiting member is sleeved on the outside of the guide rod;

[0022] The portion of the limiting member that is used to engage with the slot is located on one side of the guide rod, and the pressing portion is located on the other side of the guide rod.

[0023] In one exemplary embodiment, the headrest guide sleeve is an integral component.

[0024] In one exemplary embodiment, the first end of the guide rod is bent toward the seat to form a foam support structure.

[0025] In an exemplary embodiment, the outer surface of the first column is provided with a first reinforcing rib, and / or the outer surface of the second column is provided with a second reinforcing rib.

[0026] This application also provides a vehicle, which includes the aforementioned seat headrest adjustment structure.

[0027] Compared to some other technologies, this application has the following advantages:

[0028] The headrest adjustment structure provided in this application is simple in structure. The headrest height can be adjusted by the relative movement of the guide rod and the headrest guide sleeve. In later replacement, maintenance, or modification of the existing structure, only one headrest guide sleeve is needed, which is simple and convenient, reducing maintenance and replacement costs. The locking mechanism is located on the headrest guide sleeve, avoiding occupying the position of the first end of the guide rod. While ensuring normal headrest height adjustment, sufficient space is reserved for foaming at the first end of the guide rod, improving the foaming effect of the headrest.

[0029] The vehicle provided in this application embodiment has the aforementioned seat headrest adjustment structure, which makes headrest height adjustment convenient, provides high headrest comfort, and has low manufacturing and subsequent replacement and maintenance costs.

[0030] Other features and advantages of this application will be set forth in the following description. Attached Figure Description

[0031] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0032] Figure 1 This is a schematic diagram of the seat headrest adjustment structure described in the embodiments of this application. Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the seat headrest adjustment structure described in the embodiments of this application. Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the seat headrest adjustment structure described in the embodiments of this application. Figure 3 (The decorative front cover has been removed);

[0035] Figure 4 This is a schematic diagram of the seat headrest adjustment structure described in the embodiments of this application. Figure 4 (Decorative elements have been removed);

[0036] Figure 5 This is a schematic diagram of the guide rod described in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the headrest guide sleeve described in an embodiment of this application. Figure 1 ;

[0038] Figure 7 This is a schematic diagram of the headrest guide sleeve described in an embodiment of this application. Figure 2 (A section was cut at the locking mechanism);

[0039] Figure 8 for Figure 7 A cross-sectional view of the first column in the middle;

[0040] Figure 9 for Figure 8 A cross-sectional view of the middle section (with the limiting ribs and guide rods removed);

[0041] Figure 10 This is a schematic diagram of the seat headrest adjustment structure described in the embodiments of this application. Figure 5 (The decorative front cover is hidden, and an explosion is shown);

[0042] Figure 11 This is a schematic diagram of the structure of the limiting member described in the embodiments of this application;

[0043] Figure 12 This is a schematic diagram of the locking mechanism described in an embodiment of this application.

[0044] Illustration:

[0045] 1-Guide rod, 11-First end, 12-Card slot, 2-Headrest guide sleeve, 21-First column, 211-First reinforcing rib, 22-Second column, 221-Second reinforcing rib, 23-Mounting plate, 231-Second connecting hole, 24-Through hole, 25-Connecting groove, 26-Matching part, 3-Locking mechanism, 31-Limiting part, 311-Snap-fit ​​part, 312-Mounting part, 313-Pressing part, 32-Elastic part, 4-Decorative part, 41-Decorative front cover, 411-Through hole, 42-Decorative rear cover, 421-First connecting plate, 422-First connecting hole. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0047] This application provides a seat headrest adjustment structure, such as Figures 1 to 12As shown, the seat headrest adjustment structure includes a guide rod 1 and a headrest guide sleeve 2. The headrest guide sleeve 2 is fixed to the seat. The guide rod 1 passes through the headrest guide sleeve 2 and can move relative to the headrest guide sleeve 2. The first end 11 of the guide rod 1 extends out of the headrest guide sleeve 2 and forms a free end. The first end 11 of the guide rod 1 is used to foam to form a headrest. A locking mechanism 3 is provided on the headrest guide sleeve 2. The locking mechanism 3 is configured to lock the guide rod 1 after it moves to a set position.

[0048] The seat here can be the driver's seat or the seat occupied by other passengers.

[0049] It should be understood that, for the sake of clarity, this explanation only uses the height adjustment of the headrest as an example. In practical applications, the headrest can also be adjusted to the left and right positions. The adjustment of the left and right positions can also adopt the adjustment structure in this application and be adapted accordingly, which will not be elaborated here.

[0050] The headrest guide sleeve 2 is fixedly installed on the seat, specifically on the seat frame. The headrest guide sleeve 2 remains in a fixed position, while the guide rod 1 passes through the hole in the headrest guide sleeve 2 and can slide up and down relative to the headrest guide sleeve 2 to adjust the height of the seat headrest.

[0051] A locking mechanism 3 is provided on the headrest guide sleeve 2, which is used to fix the guide rod 1 in a set position. In practical application, when the driver or passenger feels that the headrest height is not suitable and needs to be adjusted, the locking mechanism 3 can be released to adjust the headrest height up or down; after the headrest height is adjusted to a suitable position, the locking mechanism 3 is closed to lock the headrest in that suitable position. The operation is simple and convenient, improving the user experience of the driver and passenger.

[0052] In one exemplary embodiment, such as Figure 6 and Figure 7 As shown, the headrest guide sleeve 2 includes a mounting plate 23 and a first column 21 and a second column 22 connected to the mounting plate 23. At least one of the first column 21 and the second column 22 is provided with a locking mechanism 3. Both the first column 21 and the second column 22 are provided with through holes 24 for the guide rod 1 to pass through.

[0053] The guide rod 1 can be a U-shaped rod. Correspondingly, the headrest guide sleeve 2 includes a first column 21 and a second column 22 through which the two legs of the guide rod 1 can pass respectively. In other words, the guide rod 1 is simultaneously inserted into the first column 21 and the second column 22 to improve the smoothness of the sliding of the guide rod 1 and avoid jamming.

[0054] The locking mechanism 3 can be simultaneously installed on both the first column 21 and the second column 22 to ensure the locking effect after locking and prevent the guide rod 1 from accidentally sliding after locking. Alternatively, the locking mechanism 3 can be installed on only one of the first column 21 and the second column 22 to reduce the number of components and simplify the adjustment structure.

[0055] The headrest guide sleeve 2 also includes a mounting plate 23. The headrest as a whole can be fixed to the seat through the mounting plate 23. As a mounting structure, the mounting plate 23 eliminates the need to set mounting holes or other structures on the first column 21 or the second column 22, simplifying the structure of the first column 21 and the second column 22, reducing the overall manufacturing difficulty and cost of the headrest guide sleeve 2, and improving the installation reliability of the headrest guide sleeve 2.

[0056] In one exemplary embodiment, such as Figure 8 , Figure 9 and Figure 12 As shown, the guide rod 1 has multiple locking slots 12 along the height direction, and the headrest guide sleeve 2 has a connecting slot 25; the locking mechanism 3 includes a limiting member 31, which is installed in the connecting slot 25 and can move in the direction close to the guide rod 1 and away from the guide rod 1, so that the limiting member 31 is at least partially engaged in the locking slot 12 or disengaged from the locking slot 12, so as to lock or release the guide rod 1.

[0057] Each slot 12 corresponds to a different height position of the headrest. For example, there are 5 slots 12 on the first column 21 along the height direction, that is, the headrest has 5 adjustable positions in the height direction.

[0058] When passengers feel that the headrest height is not suitable and needs to be adjusted, they can operate the locking mechanism 3 to disengage the limiting piece 31 from the locking groove 12, release the guide rod 1, thereby releasing the locking effect of the locking mechanism 3, and adjust the headrest height up and down. After the headrest height is adjusted to be suitable, passengers can operate the locking mechanism 3 to engage the limiting piece 31 into the corresponding locking groove 12, lock the guide rod 1, and lock the headrest in the appropriate position. The operation is simple and convenient, improving the user experience for passengers.

[0059] The limiting member 31 is installed in the connecting groove 25 and can move in the direction close to the first column 21 and away from the first column 21. In other words, the connecting groove 25 can be perpendicular to the height direction of the first column 21, and the limiting member 31 can move in the direction perpendicular to the height of the first column 21.

[0060] It should be understood that, in addition to the above-mentioned method of adjusting height using the slot 12, other methods can also be used for height adjustment, such as: the first column 21 may not have a slot, and the limiting member 31 may directly abut against the first column 21 to fix the position of the guide rod 1; or, multiple locking protrusions may be provided on the first column 21 along the height direction, and the guide rod 1 may be fixed in a set position through the cooperation of the limiting member 31 and the locking protrusions.

[0061] In one exemplary embodiment, such as Figure 8 As shown, the locking mechanism 3 also includes an elastic element 32, a mounting part 312 is provided on the limiting member 31, and a mating part 26 is provided on the headrest guide sleeve 2. One end of the elastic element 32 is connected to the mounting part 312, and the other end is connected to the mating part 26. The elastic element 32 is configured to provide a restoring force to make the limiting member 31 snap into the locking groove 12.

[0062] The elastic element 32 serves as a reset structure, ensuring that the limiting element 31 remains locked in the locking groove 12 when not pressed by the driver or passenger, thus preventing the headrest from shaking due to unexpected situations and ensuring the safety of the driver and passenger.

[0063] The addition of the elastic element 32 further enhances the automation of the locking mechanism 3. For instance, when only the headrest height needs to be adjusted (i.e., the limit element 31 is moved to the adjacent slot 12), the user only needs to operate the locking mechanism 3 to disengage the limit element 31 from the slot 12. When the limit element 31 reaches the adjacent slot 12, it automatically engages with the slot 12 under the action of the elastic element 32, eliminating the need for manual operation and improving the user experience.

[0064] The two ends of the elastic member 32 are connected to the mounting part 312 and the mating part 26 respectively. It should be understood that the "connection" here can be a fixed connection, such as adhesive or snap-fit ​​connection, or it can simply be abutting.

[0065] The elastic element 32 can be a spring.

[0066] In one exemplary embodiment, such as Figure 8 As shown, the limiting member 31 is provided with a protrusion extending along the through direction of the connecting groove 25, the protrusion forming a mounting part 312, and one end of the elastic member 32 is sleeved on the outside of the protrusion; a mounting groove is provided on the side wall of the connecting groove 25, the mounting groove forming a mating part 26, and the other end of the elastic member 32 extends into the mounting groove.

[0067] The limiting member 31 has a protrusion as a mounting part 312, and one end of the elastic member 32 is sleeved on the outside of the protrusion and abuts against the limiting member 31. The protrusion can guide the elastic member 32 to prevent the elastic member 32 from tilting during the deformation process, and ensure that the elastic member 32 can smoothly keep the limiting member 31 locked in the locking groove 12.

[0068] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, the seat headrest adjustment structure also includes a decorative piece 4 fitted onto the outside of the headrest guide sleeve 2.

[0069] A decorative piece 4 is fitted on the outside of the headrest guide sleeve 2 to prevent the headrest guide sleeve 2 from being exposed, reduce the aesthetic requirements of the headrest guide sleeve 2, improve the overall aesthetics of the seat headrest adjustment structure, and the decorative piece 4 can also protect the headrest guide sleeve 2 to prevent wear and tear.

[0070] In one exemplary embodiment, such as Figures 1 to 3 As shown, the decorative component 4 includes a decorative front cover 41 and a decorative rear cover 42. The decorative front cover 41 is fastened to the decorative rear cover 42 to cover the headrest guide sleeve 2; the decorative rear cover 42 is fixedly connected to the seat.

[0071] The front and rear covers snap together to form a complete decorative piece 4. The installation method is simple, which simplifies the assembly process and facilitates future replacement. The decorative rear cover 42 is fixedly connected to the seat to ensure that the decorative piece 4 is securely fixed. The decorative front cover 41 and the decorative rear cover 42 can be snapped together and fixed by means of snap-fit, screw connection or other methods.

[0072] In one exemplary embodiment, a through hole 411 is provided on the decorative front cover 41 or the decorative rear cover 42. A limiting member 31 is located in or partially extends out of the through hole 411 to form a pressing portion 313. The pressing portion 313 is configured to, upon receiving a pushing force, move the limiting member 31 to disengage it from the locking groove 12, thereby releasing the guide rod 1. Figures 1 to 3 As shown, a perforation 411 is provided on the decorative front cover 41.

[0073] The limiting member 31 can be located within the through hole 411, that is, the limiting member 31 is flush with or recessed within the through hole 411. The user can unlock the locking mechanism 3 by pressing the limiting member 31 within the through hole 411 to adjust the headrest height. The limiting member 31 is located within the through hole 411 and does not protrude from the through hole 411, which can prevent the limiting member 31 from forming a protruding part that is easily scratched or damaged.

[0074] The limiting member 31 may also partially extend out of the through hole 411 to form a pressing part 313, which serves as a button for unlocking the locking mechanism 3. When the user presses the pressing part 313, the locking mechanism 3 is released, and the user can freely adjust the headrest height; after the headrest is adjusted to a suitable height, releasing the pressing part 313 will lock the locking mechanism 3 again. The protruding design of the limiting member 31 facilitates user operation.

[0075] In one exemplary embodiment, such as Figure 10As shown, a first connecting plate 421 is provided on the decorative back cover 42, and a first connecting hole 422 is provided on the first connecting plate 421; a second connecting hole 231 is provided on the mounting plate 23; a third connecting hole is provided on the seat; fasteners are inserted into the first connecting hole 422, the second connecting hole 231 and the third connecting hole to fix the decorative back cover 42, the headrest guide sleeve 2 and the seat.

[0076] Fasteners are simultaneously inserted into the first connecting hole 422, the second connecting hole 231, and the third connecting hole, that is, the fasteners fix the decorative back cover 42, the headrest guide sleeve 2, and the seat together.

[0077] It should be understood that the decorative back cover 42, the headrest guide sleeve 2 and the seat can also be connected in other ways, such as snap-fitting, adhesive bonding, etc., and this application does not limit this.

[0078] In one exemplary embodiment, such as Figure 8 and Figure 11 As shown, the limiting member 31 is a ring-shaped component, and the limiting member 31 is sleeved on the outside of the guide rod 1; the part of the limiting member 31 used to engage with the locking groove 12 (i.e., the locking part 311) is located on one side of the guide rod 1, and the pressing part 313 is located on the other side of the guide rod 1.

[0079] The limiting member 31 is configured as a ring-shaped component and sleeved on the outside of the guide rod 1, so that the user can directly release the restriction of the locking part 311 and the locking groove 12 after pressing the pressing part 313, thereby unlocking the locking mechanism 3. In other words, the user presses the pressing part 313 to move the limiting member 31 along the A direction (e.g., ...). Figure 8 When the user moves the limit member 31 in the direction A shown, the latching part 311 on the limit member 31 moves in the direction A and disengages from the locking groove 12, thereby unlocking the locking mechanism 3; after the user releases the pressing part 313, the limit member 31 moves in the opposite direction of the direction A, causing the latching part 311 on the limit member 31 to engage in the locking groove 12 in the opposite direction of the direction A, thereby locking the locking mechanism 3.

[0080] In one exemplary embodiment, such as Figure 6 As shown, the headrest guide sleeve 2 is an integral component.

[0081] The headrest guide rod 1 is designed as an integrated component, which can greatly simplify the assembly process of the seat headrest adjustment structure. The headrest guide sleeve 2 is a separate component that does not need to be assembled and can be directly applied to the seat, making it easy to install and reliable in operation.

[0082] Furthermore, the headrest guide sleeve 2, being a separate component, is easy to replace; it can be replaced directly when damaged, reducing maintenance costs. In addition, it allows for convenient upgrades and modifications to existing vehicle seat structures.

[0083] For different seat headrest adjustment structures (such as different size and strength requirements), only the headrest guide sleeve 2 needs to be replaced (replace the headrest guide sleeve 2 with different sizes and strengths), without the need for complicated adjustments.

[0084] In one exemplary embodiment, such as Figures 1 to 5 As shown, the first end 11 of the guide rod 1 is bent toward the seat to form a foam support structure.

[0085] The first end 11 of the guide rod 1 serves as a support structure, and foam is applied to this first end 11 to form a headrest. From Figure 5 As can be seen above, the first end 11 of the guide rod 1 is bent to form a U-shaped bend.

[0086] No other structures are provided on the first end 11 of the guide rod 1. The locking switch and the headrest guide sleeve 2 are both far away from the first end 11 of the guide rod 1 to ensure that the first end 11 of the guide rod 1 has sufficient space for foaming and to prevent the locking switch and other components from affecting the foaming space of the headrest.

[0087] In one exemplary embodiment, such as Figure 6 As shown, the outer surface of the first column 21 is provided with a first reinforcing rib 211, and / or the outer surface of the second column 22 is provided with a second reinforcing rib 221.

[0088] Reinforcing ribs are provided on the outer surfaces of the first column 21 and the second column 22 to improve the strength of the first column 21 and the second column 22, reduce the amount of material used in the headrest guide sleeve 2, and reduce the weight and manufacturing cost of the headrest guide sleeve 2.

[0089] The first reinforcing rib 211 can be staggered, for example, the first reinforcing rib 211 includes horizontally arranged reinforcing ribs and vertically arranged reinforcing ribs to form a grid structure to ensure the strength of the first column 21. The second reinforcing rib 221 is arranged in the same way.

[0090] This application also provides a vehicle, which includes the aforementioned seat headrest adjustment structure.

[0091] The vehicle provided in this application embodiment has the aforementioned seat headrest adjustment structure, which makes headrest height adjustment convenient, provides high headrest comfort, and has low manufacturing and subsequent replacement and maintenance costs.

[0092] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "one end", and "one side" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the structure referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0093] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "connection," "assembly," and "installation" should be interpreted broadly. For example, the term "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0094] The embodiments described in this application are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with or in lieu of any other feature or element in any other embodiment.

[0095] This application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this application can also be combined with any conventional features or elements to form a unique technical solution as defined by the claims. Any feature or element of any embodiment can also be combined with features or elements from other technical solutions to form another unique technical solution as defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this application can be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.

Claims

1. A seat headrest adjustment structure, characterized in that, Includes a guide rod and a headrest guide sleeve. The headrest guide sleeve is fixed to the seat. The guide rod passes through the headrest guide sleeve and can move relative to the headrest guide sleeve. The first end of the guide rod extends out of the headrest guide sleeve and forms a free end. The first end of the guide rod is used to foam to form a headrest. The headrest guide sleeve is provided with a locking mechanism, which is configured to lock the guide rod after the guide rod moves to a set position; The headrest guide sleeve includes a mounting plate and a first column and a second column connected to the mounting plate. At least one of the first column and the second column is provided with the locking mechanism. Both the first column and the second column are provided with through holes for the guide rod to pass through. The headrest guide sleeve is an integral component. The seat headrest adjustment structure also includes a decorative piece fitted onto the outside of the headrest guide sleeve.

2. The seat headrest adjustment structure according to claim 1, characterized in that, The guide rod has multiple locking slots along the height direction, and the headrest guide sleeve has a connecting slot. The locking mechanism includes a limiting member installed in the communicating groove and movable in directions close to and away from the guide rod, so that the limiting member is at least partially engaged in or disengaged from the locking groove to lock or release the guide rod.

3. The seat headrest adjustment structure according to claim 2, characterized in that, The locking mechanism further includes an elastic element, the limiting element is provided with a mounting part, the headrest guide sleeve is provided with a mating part, one end of the elastic element is connected to the mounting part, and the other end is connected to the mating part; The elastic element is configured to provide a restoring force that causes the limiting element to engage with the locking slot.

4. The seat headrest adjustment structure according to claim 3, characterized in that, The limiting member is provided with a protrusion extending along the through direction of the connecting groove, the protrusion forming the mounting part, and one end of the elastic member is sleeved on the outside of the protrusion; An installation groove is provided on the side wall of the connecting groove, and the installation groove forms the mating part. The other end of the elastic member extends into the installation groove.

5. The seat headrest adjustment structure according to claim 2, characterized in that, The decorative component includes a decorative front cover and a decorative back cover, the decorative front cover being fastened to the decorative back cover to cover the headrest guide sleeve; The decorative back cover is fixedly connected to the seat.

6. The seat headrest adjustment structure according to claim 5, characterized in that, The decorative front cover or the decorative rear cover is provided with a through hole, and the limiting member is located in the through hole or partially extends out of the through hole to form a pressing part. The pressing part is configured to: after being pushed, drive the limiting member to move so that the limiting member is disengaged from the locking groove to release the guide rod.

7. The seat headrest adjustment structure according to claim 6, characterized in that, The decorative rear cover is provided with a first connecting plate, and the first connecting plate is provided with a first connecting hole; the mounting plate is provided with a second connecting hole; the seat is provided with a third connecting hole; Fasteners are inserted into the first connecting hole, the second connecting hole, and the third connecting hole to securely connect the decorative back cover, the headrest guide sleeve, and the seat.

8. The seat headrest adjustment structure according to claim 6, characterized in that, The limiting member is a ring-shaped component, and the limiting member is sleeved on the outside of the guide rod; The portion of the limiting member that is used to engage with the slot is located on one side of the guide rod, and the pressing portion is located on the other side of the guide rod.

9. The seat headrest adjustment structure according to any one of claims 1 to 8, characterized in that, The first end of the guide rod is bent toward the seat to form a foam support structure.

10. The seat headrest adjustment structure according to any one of claims 1 to 8, characterized in that, The outer surface of the first column is provided with a first reinforcing rib, and / or the outer surface of the second column is provided with a second reinforcing rib.

11. A vehicle, characterized in that, Includes the seat headrest adjustment structure as described in any one of claims 1 to 10.

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