Adjustable backrest for electric vehicle

Abstract

The adjustable backrest for the electric vehicle comprises an electric vehicle seat cushion, the tail of the electric vehicle seat cushion is fixedly connected with an assembling support, the side wall of the top of the assembling support is fixedly connected with a foundation pillar facing the front of the electric vehicle, a limiting groove is formed in one side of the foundation pillar in the circumferential direction, and a limiting block is slidably connected into the limiting groove. The periphery of the base column is sleeved with a telescopic rod, the limiting block is fixedly connected with the inner wall of the telescopic rod, the outer side of the end, close to the assembling support, of the telescopic rod is sleeved with an adjusting cylinder in a threaded mode, the end, close to the assembling support, of the adjusting cylinder is rotationally connected with the assembling support, and the periphery of the end, close to the assembling support, of the adjusting cylinder is sleeved with a locking piece used for locking rotation of the adjusting cylinder. A backrest component is hinged to one end of the telescopic rod away from the assembly bracket. The back cushion is reliable and practical, the position of the back cushion is changed through stretching of the telescopic rod to support the back of a driver, the angle of the back cushion is fixed through the hinge locking block, support is provided for the electric vehicle driver, and vehicle using experience is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric vehicle seat cushions, in particular to an adjustable backrest for an electric vehicle. Background Art

[0002] The electric vehicle seat cushion is the main component that supports the driver while driving. The seat cushion not only has a simple supporting function, but also has a partial buffering effect. Therefore, the design of the seat cushion is very important. For the safety of riding, the existing electric vehicle seat cushions are welded as one piece with the electric vehicle seat backrest and the seat, which cannot be disassembled and is not convenient to adjust, resulting in its functionality and applicability being relatively low. However, with the improvement of living standards, people have higher requirements for the comfort of seat cushion support. Even when the driver is driving alone, there is a need to use a backrest to support the back to relieve fatigue and discomfort. It is obvious that the existing electric vehicle backrest does not have such a function.

[0003] Therefore, it is necessary to propose an adjustable backrest for electric vehicles that can adjust and fix the backrest position, provide back support for electric vehicle drivers, and relieve driving fatigue. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide an adjustable backrest for electric vehicles, which supports the driver's back by changing the position of the telescopic rod on the assembly bracket through telescopic extension, and uses a locking piece and a hinge block to fix the length of the telescopic rod and the angle of the cushion, providing comfortable support for single-person driving of the electric vehicle driver and improving the driving experience.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an adjustable backrest for an electric vehicle, comprising an electric vehicle seat cushion, an assembly bracket fixedly connected to the rear end of the electric vehicle seat cushion, a base column facing the front of the electric vehicle fixedly connected to the top side wall of the assembly bracket, a limiting groove is opened on one circumferential side of the base column, a limiting block is slidably connected in the limiting groove, a telescopic rod is sleeved on the outer periphery of the base column, the limiting block is fixedly connected to the inner wall of the telescopic rod, an adjustment cylinder is threadedly sleeved on the outer side of one end of the telescopic rod close to the assembly bracket, and the adjustment cylinder is rotatably connected to the assembly bracket on the outer periphery of the end of the adjustment cylinder close to the assembly bracket, a locking member for locking the rotation of the adjustment cylinder is sleeved on the outer periphery of the end of the telescopic rod away from the assembly bracket, and a backrest assembly for supporting the back of the electric vehicle driver is hingedly connected to the end of the telescopic rod away from the assembly bracket.

[0006] The principle of the basic solution is: to use an assembly bracket fixedly connected to the rear of the electric vehicle seat as a support point. A base column is fixed on the assembly bracket, and a limit slot is opened on one side of the base column for sliding connection of the limit block. The limit block is fixedly connected to the inner wall of the telescopic rod, so that the telescopic rod can slide on the base column along the direction of the limit slot. An adjustment cylinder is threaded on the outer side of one end of the telescopic rod, and the adjustment cylinder is rotatably connected to the assembly bracket. By rotating the adjustment cylinder, the telescopic rod can be pushed to slide on the base column, thereby adjusting the length of the telescopic rod. In order to lock the rotation of the adjustment cylinder, a locking piece is provided on the outer periphery of the end of the adjustment cylinder close to the assembly bracket. When the appropriate length is adjusted, the adjustment cylinder can be fixed by the locking piece to prevent it from continuing to rotate. The backrest assembly is hinged to the end of the telescopic rod away from the assembly bracket, so that the angle of the backrest assembly can be adjusted according to the needs of the driver to provide more comfortable back support.

[0007] The beneficial effects of the basic solution are: 1. By adjusting the length of the telescopic rod and the angle of the backrest component, it can accurately adapt to the height and sitting habits of different drivers, provide more personalized back support, and improve driving comfort.

[0008] 2. With the design of threaded connection and locking parts, the driver can easily adjust the position and angle of the backrest without complicated tools or operations, making it more convenient to use.

[0009] 3. The sliding connection design of the base column, limit groove, limit block and telescopic rod ensures the stability of the backrest during adjustment and avoids the risk of shaking or falling off.

[0010] 4. The adjustable backrest is suitable for various models of electric vehicles. It only needs to be properly installed and adjusted according to the actual situation of the electric vehicle to meet the driver's back support needs.

[0011] Furthermore, the locking part includes a locking ring, and the side wall of the assembly bracket is fixedly connected to a limiting protrusion located inside the locking ring. A number of locking grooves perpendicular to the limiting protrusion are opened on the assembly bracket on the outer periphery of the limiting protrusion, and locking blocks are slidably fitted in the locking grooves. A number of rotating closing rods corresponding to the locking grooves are provided on the inner circumference of the locking ring, and the outer ends of the rotating closing rods are hinged to the circumferential inner wall of the locking ring. The middle of the rotating closing rods are rotatably connected to the corresponding locking blocks respectively. The limiting protrusion and the outer wall of the adjusting cylinder are provided with a number of limiting holes corresponding to the closing position of the rotating closing rod.

[0012] The beneficial effects of the basic solution are: 1. Through the cooperation of the locking ring, the limiting convex ring, the locking groove, the locking block and the rotating closing rod, the adjustment cylinder can be firmly locked after being adjusted to the desired position, avoiding the loosening or displacement of the adjustment cylinder due to vibration or misoperation, thereby enhancing the stability of the entire backrest system.

[0013] 2. The locking mechanism allows the driver to more easily lock the adjustment cylinder when adjusting the backrest, avoiding safety hazards caused by improper adjustment. At the same time, the firmness of the locking mechanism also ensures that the backrest will not suddenly loosen or collapse during driving, improving driving safety.

[0014] 3. The locking mechanism allows the operator to easily lock or unlock the adjustment cylinder by rotating the locking ring, eliminating the need for complex tools or tedious operations. This design not only improves ease of use but also reduces operational difficulty and cost.

[0015] Furthermore, the backrest assembly includes a cushion, one side wall of the cushion is fixedly connected to a hinge shaft, an end of the telescopic rod close to the cushion is horizontally and symmetrically fixedly connected to a hinge arm, the hinge arm is sleeved with the hinge shaft, a hinge slot is provided inside the end of the telescopic rod close to the cushion, a hinge block is slidably connected in the hinge slot, a plurality of hinge teeth are provided on the outer side of the hinge shaft close to the telescopic rod, an end of the hinge block close to the hinge shaft is engaged with the hinge teeth, and a spring is fixedly connected between the hinge block and the inner wall of the hinge slot.

[0016] The benefits of the basic solution are as follows: 1. Through the design of the hinge axis and hinge arm, the backrest cushion can rotate around the hinge axis to adjust the backrest angle. This design allows the driver to adjust the backrest angle according to their needs and preferences, improving driving comfort and satisfaction.

[0017] 2. The meshing design of the hinge block and the hinge teeth allows the backrest to be securely locked after adjusting to the desired angle. The addition of a spring further enhances the stability of the lock, preventing loosening due to vibration or external force, ensuring the safety of the driver during driving.

[0018] Furthermore, a pull rod is fixedly connected to the side wall of the hinge block, and the pull rod passes through the side wall of the telescopic rod and extends outside the telescopic rod.

[0019] The benefits of the basic solution are: 1. The pull rod design allows the driver to easily control the movement of the hinge block manually, thereby locking and unlocking the backrest angle. This design greatly simplifies the operation process and improves convenience.

[0020] 2. The pull rod design allows the driver to easily adjust the backrest angle without leaving the seat, avoiding the potential safety hazards caused by distraction or leaving the driving position due to backrest adjustment. This design improves safety and stability during driving.

[0021] 3. The pull rod is usually made of strong and durable materials, which can withstand frequent pulling and pushing and is not easy to be damaged. This enhances the durability of the backrest assembly and extends its service life.

[0022] Furthermore, an elastic breathable layer is provided on the side wall of the cushion away from the telescopic rod.

[0023] The beneficial effects of the basic solution are: 1. The elastic breathable layer can fit the curve of the human back, providing better support and wrapping, so that the driver can feel more comfortable during long driving.

[0024] 2. The breathable layer should be made of a material with good breathability, such as highly breathable fabric or mesh material, which can effectively remove moisture and heat generated by the back, keeping the back dry. This is crucial to prevent the back from getting damp and stuffy due to long periods of sitting.

[0025] 3. Good breathability helps reduce bacterial growth and lower the risk of back skin infection. The elastic breathable layer design can also promote blood circulation in the back to a certain extent, relieving back stiffness and fatigue caused by long periods of sitting.

[0026] Furthermore, a lever handle is fixedly connected to the outer periphery of the middle portion of the adjustment cylinder.

[0027] The benefits of the basic solution are as follows: 1. The lever handle provides an intuitive and easy-to-grip operating point, allowing the driver to easily rotate the adjustment cylinder to adjust the backrest height. This design reduces the difficulty of operation, allowing even first-time drivers to quickly master the adjustment method.

[0028] 2. By using the lever handle, the driver can more precisely control the rotation speed and angle of the adjustment cylinder, thereby achieving fine-tuning of the backrest height. This helps to meet the personalized backrest height needs of drivers of different heights and sitting habits.

[0029] 3. The design of the lever handle is generally based on ergonomics, ensuring that the driver can maintain a stable posture and force output during operation. This helps reduce the risk of damage to the adjustment cylinder due to improper operation and improves the stability of the entire backrest system.

[0030] Furthermore, the outer wall of the locking ring is engraved with a number of axial stripes corresponding to the positions of the rotating closing rods along its circumference, and the outer wall of the adjustment cylinder is engraved with a number of punctuation marks along its circumference, and the punctuation marks correspond to the positions of the limiting holes one by one.

[0031] The basic solution offers the following benefits: 1. The striped design on the outer wall of the locking ring allows the driver to visually identify the position of the rotating closure rod, allowing them to more accurately determine whether the locking ring has been rotated to the correct position. Markings engraved on the outer circumference of the adjustment cylinder correspond to the position of the stop holes, providing a clear reference point for the driver, helping to ensure that the adjustment cylinder is accurately aligned with the stop holes during rotation.

[0032] 2. By observing the positional relationship between the stripes and the dot, the driver can more easily confirm whether the locking ring is securely locked in the desired position. This design reduces the risk of loose locking due to improper operation or misjudgment, and improves the safety and stability of the entire backrest system.

[0033] 3. The design of stripes and punctuation allows the driver to judge the position and status of the adjustment cylinder without complicated operations or relying on other tools. This simplifies the operation process, improves efficiency, and reduces operating costs.

[0034] Furthermore, the number of the rotating closing rods is at least 6.

[0035] The basic solution offers the following benefits: More rotating closure rods mean more points at which the locking ring can engage with the stop holes on the assembly bracket when the locking ring is rotated into position, enhancing locking stability and reliability. This reduces safety hazards caused by insecure locking and improves the safety of the entire backrest system. The increased number of rotating closure rods, the key component connecting the locking ring and the assembly bracket, helps distribute and withstand greater forces, thereby strengthening the overall structure. This makes the backrest system more durable, able to withstand greater shock and vibration, and extending its service life.

[0036] Furthermore, the number of the hinge locking teeth is at least 5.

[0037] The beneficial effects of the basic solution are: more hinge locking teeth mean that there are more engagement points when the hinge block and the hinge shaft are engaged, thereby enhancing the reliability and stability of the locking. This reduces the risk of loosening or damage due to excessive force on a single engagement point, and improves the durability and safety of the entire backrest assembly. The increase in the number of hinge locking teeth allows for more engagement angles when adjusting the backrest angle, thereby improving the accuracy of the adjustment. This allows the driver to adjust the backrest angle more precisely according to their needs and preferences, improving driving comfort and satisfaction. As a key component connecting the hinge block and the hinge shaft, the increase in the number of hinge locking teeth helps to disperse and withstand greater forces, thereby enhancing the strength and durability of the entire structure. This allows the backrest assembly to withstand greater shock and vibration, extending its service life.

[0038] Furthermore, the bottom end of the assembly bracket is connected to the bottom wall of the electric vehicle seat by bolts.

[0039] The basic solution offers the advantage of bolted connections that are easy to install and remove. To install or remove the backrest assembly, simply tighten or loosen the bolts using the appropriate tools. This simplifies the installation and removal process, reduces operational difficulty, and improves efficiency. This also makes the design highly adaptable and suitable for a wide range of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is an axonometric view of an adjustable backrest for an electric vehicle in an embodiment of the present utility model.

[0041] Figure 2 It is a side sectional view of an adjustable backrest for an electric vehicle in an embodiment of the present utility model.

[0042] Figure 3 It is a front cross-sectional view of a locking ring of an adjustable backrest for an electric vehicle in an embodiment of the present utility model.

[0043] The figure marks in the drawings of the specification include: 1. electric vehicle seat; 2. bolt; 3. assembly bracket; 4. locking ring; 5. rotating closing rod; 6. limiting convex ring; 7. limiting hole; 8. base column; 9. limiting groove; 10. limiting block; 11. telescopic rod; 12. lever handle; 13. spring; 14. hinge block; 15. pull rod; 16. hinge shaft; 17. cushion; 18. elastic breathable layer; 19. hinge teeth; 20. adjusting cylinder; 21. locking block; 22. locking groove; 23. stripes; 24. punctuation. DETAILED DESCRIPTION

[0044] The following is further described in detail through specific implementation methods:

[0045] Example

[0046] Basically as attached Figure 1 、 Figure 2 and Figure 3 As shown: An adjustable backrest for an electric vehicle comprises an electric vehicle seat cushion 1, the tail of the electric vehicle seat cushion 1 is fixedly connected to an assembly bracket 3, the bottom end of the assembly bracket 3 is connected to the bottom wall bolt 2 of the electric vehicle seat cushion 1, the top side wall of the assembly bracket 3 is fixedly connected to a base column 8 facing the front of the electric vehicle, a limiting groove 9 is opened on one side of the circumference of the base column 8, a limiting block 10 is slidably connected in the limiting groove 9, a telescopic rod 11 is sleeved on the outer periphery of the base column 8, the limiting block 10 is fixedly connected to the inner wall of the telescopic rod 11, an adjusting cylinder 20 is threadedly sleeved on the outer side of one end of the telescopic rod 11 close to the assembly bracket 3, the adjusting cylinder 20 is rotatably connected to the assembly bracket 3 at one end close to the assembly bracket 3, and a lever handle 12 is fixedly connected to the outer periphery of the middle of the adjusting cylinder 20.

[0047] The outer periphery of one end of the adjusting cylinder 20 close to the assembly bracket 3 is provided with a locking part for locking the rotation of the adjusting cylinder 20, and the locking part includes a locking ring 4, and the side wall of the assembly bracket 3 is fixedly connected to a limiting convex ring 6 located in the locking ring 4, and the assembly bracket 3 on the outer periphery of the limiting convex ring 6 is provided with a plurality of locking grooves 22 perpendicular to the limiting convex ring 6, and the locking grooves 22 are slidably fitted with locking blocks 21, and the inner circumference of the locking ring 4 is provided with a plurality of rotating closing rods 5 corresponding to the locking grooves 22, and the outer ends of the rotating closing rods 5 are hinged to the circumferential inner wall of the locking ring 4, and the middle of the rotating closing rods 5 are rotatably connected to the corresponding locking blocks 21, and the outer walls of the limiting convex ring 6 and the adjusting cylinder 20 are provided with a plurality of limiting holes 7 corresponding to the closed position of the rotating closing rod 5, the number of rotating closing rods 5 is at least 6, and the number of hinge teeth 19 is at least 5. The outer wall of the locking ring 4 is engraved with a plurality of axial stripes 23 corresponding to the positions of the rotating closing rod 5 along its circumference, and the outer wall of the adjustment cylinder 20 is engraved with a plurality of punctuation marks 24 along its circumference, and the punctuation marks 24 correspond to the positions of the limiting holes 7 one by one.

[0048] The end of the telescopic rod 11 away from the assembly bracket 3 is hinged with a backrest assembly for supporting the back of the electric vehicle driver. The backrest assembly includes a cushion 17. The side wall of the cushion 17 away from the telescopic rod 11 is covered with an elastic breathable layer 18. One side wall of the cushion 17 is fixedly connected to a hinge shaft 16. The end of the telescopic rod 11 close to the cushion 17 is horizontally and symmetrically fixedly connected to a hinge arm, which is sleeved with the hinge shaft 16. A hinge slot is provided inside the end of the telescopic rod 11 close to the cushion 17, and a hinge block 14 is slidably connected in the hinge slot. A plurality of hinge teeth 19 are provided on the outside of the hinge shaft 16 close to the telescopic rod 11. One end of the hinge block 14 close to the hinge shaft 16 is engaged with the hinge teeth 19. A spring 13 is fixedly connected between the hinge block 14 and the inner wall of the hinge slot. The side wall of the hinge block 14 is fixedly connected to a pull rod 15. The pull rod 15 passes through the side wall of the telescopic rod 11 and extends outside the telescopic rod 11.

[0049] The specific implementation process is as follows: when the driver is driving an electric vehicle alone and wants to support his back, he first rotates the locking ring 4 so that the rotating closing rod 5 inside the locking ring 4 slides in the locking groove 22 through the locking block 21, and is lifted from the vertical insertion limit hole 7 to the horizontal position, thereby unlocking the adjustment cylinder 20.

[0050] Then, using the effortless lever handle 12, the adjustment cylinder 20 is rotated to push the telescopic rod 11, which is sleeved on the base column 8, through the screw. Because the interior of the telescopic rod 11 is fixedly connected to the stop block 10 in the stop slot 9, the telescopic rod 11 can only move axially and cannot rotate. After the telescopic rod 11 is extended and close to the driver's back, the mark 24 on the adjustment cylinder 20 is aligned with the stripe 23 on the locking ring 4. The locking ring 4 is then rotated in the opposite direction, pushing the rotating closing rod 5 back to the vertical position in the same sliding manner and inserting it into the stop hole 7. At this point, the rotation of the adjustment cylinder 20 is locked with the side wall of the assembly bracket 3, preventing the telescopic rod 11 from accidentally shortening.

[0051] Then the driver leans on the cushion 17 and pulls the pull rod 15 to make the hinge block 14 move backward to compress the spring 13. At this time, the hinge teeth 19 lose engagement and lock, and the cushion 17 can be adjusted with the hinge shaft 16 as the center. After adjusting to a more comfortable angle, release the pull rod 15. The hinge block 14 slides in the hinge slot under the action of the energy stored in the spring 13 and engages with the hinge teeth 19 again to lock the angle of the cushion 17, ensuring the support stability of the entire device.

[0052] The elastic breathable layer 18 on the surface of the back cushion 17 can enhance the driver's comfort and reduce back stuffiness and sweat accumulation. The assembly bracket 3 fixedly connected to the electric vehicle seat cushion 1 by bolts 2 can be installed on a variety of electric vehicles, enhancing the applicability of the entire adjustable backrest.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0054] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An adjustable backrest for an electric vehicle, comprising an electric vehicle seat cushion (1), characterized in that: The rear end of the electric vehicle seat cushion (1) is fixedly connected to an assembly bracket (3), the top side wall of the assembly bracket (3) is fixedly connected to a base column (8) facing the front of the electric vehicle, a limiting groove (9) is opened on one circumferential side of the base column (8), a limiting block (10) is slidably connected in the limiting groove (9), a telescopic rod (11) is sleeved on the outer periphery of the base column (8), the limiting block (10) is fixedly connected to the inner wall of the telescopic rod (11), an outer thread sleeve of an end of the telescopic rod (11) close to the assembly bracket (3) is sleeved with an adjusting cylinder (20), an end of the adjusting cylinder (20) close to the assembly bracket (3) is rotatably connected to the assembly bracket (3), a locking piece for locking the adjusting cylinder (20) is sleeved on the outer periphery of the end of the adjusting cylinder (20) close to the assembly bracket (3), and a backrest assembly for supporting the back of the electric vehicle driver is hingedly connected to the end of the telescopic rod (11) away from the assembly bracket (3).

2. The adjustable backrest for an electric vehicle according to claim 1, characterized in that: The locking member comprises a locking ring (4), a limiting convex ring (6) located in the locking ring (4) is fixedly connected to the side wall of the assembly bracket (3), a plurality of locking grooves (22) perpendicular to the limiting convex ring (6) are opened on the assembly bracket (3) on the outer periphery of the limiting convex ring (6), and locking blocks (21) are slidably fitted in the locking grooves (22), a plurality of rotating closing rods (5) corresponding to the locking grooves (22) are provided on the inner periphery of the locking ring (4), the outer ends of the rotating closing rods (5) are hinged to the inner periphery of the locking ring (4), and the middle of the rotating closing rods (5) are respectively rotatably connected to the corresponding locking blocks (21), and the outer walls of the limiting convex ring (6) and the adjusting cylinder (20) are opened with a plurality of limiting holes (7) corresponding to the closed positions of the rotating closing rods (5).

3. The adjustable backrest for an electric vehicle according to claim 1, characterized in that: The backrest assembly includes a cushion (17), a side wall of the cushion (17) is fixedly connected to a hinge shaft (16), an end of the telescopic rod (11) close to the cushion (17) is horizontally and symmetrically fixedly connected to a hinge arm, the hinge arm is sleeved with the hinge shaft (16), a hinge slot is provided inside the end of the telescopic rod (11) close to the cushion (17), a hinge block (14) is slidably connected in the hinge slot, a plurality of hinge teeth (19) are provided on the outer side of the hinge shaft (16) close to the telescopic rod (11), an end of the hinge block (14) close to the hinge shaft (16) is meshed with the hinge teeth (19), and a spring (13) is fixedly connected between the hinge block (14) and the inner wall of the hinge slot.

4. The adjustable backrest for an electric vehicle according to claim 3, characterized in that: The side wall of the hinge block (14) is fixedly connected with a pull rod (15), and the pull rod (15) passes through the side wall of the telescopic rod (11) and extends to the outside of the telescopic rod (11).

5. The adjustable backrest for an electric vehicle according to claim 4, characterized in that: The side wall of the cushion (17) away from the telescopic rod (11) is paved with an elastic breathable layer (18).

6. The adjustable backrest for an electric vehicle according to claim 1, characterized in that: A lever handle (12) is fixedly connected to the outer periphery of the middle portion of the regulating cylinder (20).

7. The adjustable backrest for an electric vehicle according to claim 2, characterized in that: The outer wall of the locking ring (4) is engraved with a plurality of axial stripes (23) corresponding to the positions of the rotating closing rod (5) along its circumference, and the outer wall of the regulating cylinder (20) is engraved with a plurality of punctuation marks (24) along its circumference, and the punctuation marks (24) correspond to the positions of the limiting holes (7) one by one.

8. The adjustable backrest for an electric vehicle according to claim 2, characterized in that: The number of the rotating closing rods (5) is at least 6.

9. The adjustable backrest for an electric vehicle according to claim 3, characterized in that: The number of the hinge locking teeth (19) is at least 5.

10. The adjustable backrest for an electric vehicle according to claim 1, characterized in that: The bottom end of the assembly bracket (3) is connected to the bottom wall bolt (2) of the electric vehicle seat cushion (1).

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