Central armrest hinge with closing locking function

Abstract

The application discloses a central handrail hinge with a closing locking function, which comprises an upper frame, a lower frame, a hinge mechanism and a closing locking mechanism, the hinge mechanism is arranged at the two ends of the lower frame, the upper frame and the lower frame are rotationally connected through the hinge mechanism, the closing locking mechanism is arranged at the tail end of a knurled shaft included in the hinge mechanism and is integrally and torsionally connected with the knurled shaft, when the upper frame is closed along the hinge mechanism to the lower frame, the closing state position between the upper frame and the lower frame is locked through the closing locking mechanism. The closing locking mechanism is arranged at the tail end of the hinge mechanism, which does not affect the use of the hinge mechanism, and the closing state of the upper frame can be locked conveniently, the weight of the central handrail structure can be greatly reduced, and thus the light-weight design requirement of automobile parts is met.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a center armrest hinge with a closing and locking function. Background Technology

[0002] Lightweighting of automobiles has become a global trend in automotive development. Lightweighting aims to reduce the vehicle's curb weight as much as possible while ensuring safety performance, thereby reducing energy consumption and achieving energy conservation and environmental protection. This invention reduces the number of center armrest components without compromising its functionality, thus reducing the weight of the center armrest and achieving energy conservation and environmental protection goals.

[0003] Existing center armrests typically lock and close using a push-button or magnetic mechanism. Both of these methods involve a locking mechanism located within the armrest cover outside the hinge. Another option is a ratchet and pawl hinge structure. However, this type of hinge requires the pawl to disengage before it can be opened, which is inconvenient. Furthermore, the additional locking mechanism increases the weight of the center armrest, failing to meet the lightweight design requirements of automotive components. Summary of the Invention

[0004] The purpose of this invention is to provide a central handrail hinge with a closing and locking function, which solves the problem that the handrail cover plate with hinge installation in the prior art needs to be equipped with an additional locking mechanism.

[0005] The objective of this invention can be achieved through the following technical solutions: A central armrest hinge with a closing locking function includes: Previous page shelf; Next page shelf; A hinge mechanism is provided at both ends of the lower page holder, through which the upper page holder and the lower page holder are rotatably connected; A closing locking mechanism is provided at the tail end of the knurled shaft included in the hinge mechanism and is integrally and torsionalally connected to the knurled shaft. When the upper page holder rotates to close along the hinge mechanism toward the lower page holder, the closing locking mechanism locks the closed position between the upper page holder and the lower page holder.

[0006] As a further embodiment of the present invention: the closing locking mechanism includes a ball retainer, a ball pressure plate, a spring plate, and a spring pressure plate sequentially mounted on the knurled shaft. The locking part at the tail end of the knurled shaft is threadedly connected to a nut. The nut restricts one end of the spring plate through the spring pressure plate. The other end of the spring plate is pressed against the ball retainer by the ball pressure plate. Balls are disposed in multiple through holes on the ball retainer and are clamped between the lower page holder and the spring pressure plate. Multiple protrusions are provided on the end face of the lower page holder facing the ball retainer. When the upper page holder rotates to close along the hinge mechanism towards the lower page holder, the ball and the protrusions are mutually restrained and abutted.

[0007] As a further aspect of the present invention: rectangular holes are respectively provided at the center positions of the ball retainer, the ball pressure plate and the spring pressure plate, and a torsion part on the knurled shaft is inserted into the rectangular holes, the length of the torsion part being greater than the diameter of the locking part.

[0008] As a further aspect of the present invention: a spring retainer is provided at the center of the spring sheet, and a torsion part on the knurled shaft is inserted into a rectangular hole at the center of the spring retainer.

[0009] As a further embodiment of the present invention: the closing locking mechanism includes a locking plate, a ball retainer, and a high-carbon manganese spring steel sequentially mounted on the knurled shaft. A nut is threadedly connected to the locking portion at the tail end of the knurled shaft. The nut abuts against and restricts one end of the high-carbon manganese spring steel, while the other end of the high-carbon manganese spring steel presses against the ball retainer. Balls are disposed within multiple through holes in the ball retainer, and the balls are clamped between the locking plate and the high-carbon manganese spring steel. The locking plate is fixedly mounted on the lower page holder. When the upper page holder rotates to close towards the lower page holder along the hinge mechanism, the balls press against a locking hole in the locking plate, the diameter of which is smaller than the diameter of the ball's sphere. When the upper page holder rotates to open towards the lower page holder along the hinge mechanism, the balls slide along an arc-shaped sliding hole in the locking plate, the width of which is smaller than the diameter of the ball's sphere.

[0010] As a further aspect of the present invention: rectangular holes are respectively opened at the center positions of the ball retainer and the high carbon manganese spring steel, and a torsion part on the knurled shaft is inserted into the rectangular holes. The length of the torsion part is greater than the diameter of the locking part.

[0011] As a further aspect of the present invention: the high carbon manganese spring steel integral structure is provided with a plurality of protruding pressing parts, which are used to press against the balls inside the ball retainer.

[0012] As a further aspect of the present invention: the friction plate included in the hinge mechanism is fixedly mounted on the lower page frame by rivets, the friction plate is interference-fitted to the interference portion of the knurled shaft, and the spline portion on the knurled shaft is interference-fitted to the hinge shaft hole of the upper page frame.

[0013] As a further aspect of the present invention: the friction plate is provided with an elastic locking part with a gap between the upper and lower elastic locking parts, and a damping hole is formed between the upper and lower elastic locking parts, and the interference part of the knurled shaft is connected to the damping hole by interference fit.

[0014] As a further aspect of the present invention: a washer is also fitted onto the interference fit, and the washer is clamped between the upper page holder and the friction plate.

[0015] The beneficial effects of this invention are: (1) By setting the closing locking mechanism at the tail end of the hinge mechanism, the use of the hinge mechanism is not affected, and the closing state of the upper page frame is easy to lock. This solves the problem that the armrest cover plate with hinge installation needs to be set with an additional locking mechanism in the prior art. At the same time, the closing locking mechanism is used in conjunction with the hinge mechanism so that the component locked at the tail end of the knurled shaft can be designed as a closing locking mechanism, which can greatly reduce the weight of the central armrest structure and thus meet the lightweight design requirements of automotive parts. (2) It is convenient to install the handrail cover on the upper page frame and connect the handrail body on the lower page frame. The upper page frame and the lower page frame are rotated through a hinge mechanism so that the upper page frame can be opened or closed by rotating along the lower page frame. When the upper page frame is in the closed use state, the upper page frame is locked by the set closing locking mechanism to prevent it from opening due to inertia with vehicle bumps, so as to avoid the handrail cover opening due to bumps frequently colliding with the handrail body. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram showing the connection position of the upper and lower page racks on one side in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the protrusion limiting and blocking ball provided on the lower page rack in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of a closing locking mechanism provided on the knurled shaft in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram showing the disassembled closing locking mechanism provided on the knurled shaft in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram showing the connection position of the upper and lower page racks on one side in Embodiment 2 of the present invention. Figure 8 This is a schematic diagram of a closing locking mechanism provided on the knurled shaft in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram showing the disassembled closing locking mechanism provided on the knurled shaft in Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of another structure of the locking plate in Embodiment 2 of the present invention.

[0018] Figure 11 This is a schematic diagram of the friction plate connected to the upper page frame of the present invention via a knurled shaft; Figure 12 This is a schematic diagram showing the disassembled upper page holder, knurled shaft, and friction plate of the present invention.

[0019] In the diagram: 1. Top page holder; 2. Bottom page holder; 20. Raised part; 3. Knurled shaft; 30. Spline part; 31. Interference fit part; 32. Torsion part; 33. Locking part; 4. Ball bearing; 5. Ball bearing retainer one; 6. Ball bearing pressure plate; 7. Spring retainer; 8. Spring plate; 9. Spring pressure plate; 10. Nut; 11. Friction plate; 110. Elastic locking part; 111. Damping hole; 12. Washer; 13. Rivet; 14. Locking plate; 140. Locking hole; 141. Arc-shaped sliding hole; 142. Arc-shaped sliding groove; 15. Ball bearing retainer two; 16. High carbon manganese spring steel; 160. Raised pressure part. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention; in the description of this invention, "a plurality of" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] Example 1 Please see Figures 1 to 5 As shown, the present invention is a central armrest hinge with a closing and locking function, including an upper page holder 1, a lower page holder 2, a hinge mechanism, and a closing and locking mechanism. The hinge mechanism is located at both ends of the lower page holder 2, and the upper page holder 1 and the lower page holder 2 are rotatably connected through the hinge mechanism. The closing and locking mechanism is located at the tail end of the knurled shaft 3 included in the hinge mechanism, and is integrally and torsionally connected with the knurled shaft 3. When the upper page holder 1 rotates and closes to the lower page holder 2 along the hinge mechanism, the closing and locking mechanism locks the closed position between the upper page holder 1 and the lower page holder 2.

[0023] This application facilitates the installation of an armrest cover on the upper page holder 1 and the connection of the armrest body to the lower page holder 2. The upper page holder 1 and the lower page holder 2 are rotated by a hinge mechanism, allowing the upper page holder 1 to easily rotate and open or close along the lower page holder 2. When the upper page holder 1 is in the closed use state, a locking mechanism is provided to lock the upper page holder 1, preventing it from opening due to inertia when the vehicle is bumpy, thus avoiding frequent collisions between the opened armrest cover and the armrest body. This application solves the problem of the prior art requiring an additional locking mechanism for hinged armrest covers by setting the locking mechanism at the tail end of the hinge mechanism without affecting the use of the hinge mechanism, while also facilitating the locking of the upper page holder 1 in the closed state. At the same time, the locking mechanism works in conjunction with the hinge mechanism, so that the component locking the tail end of the knurled shaft 3 can be designed as a locking mechanism, which can greatly reduce the weight of the central armrest structure, thereby meeting the lightweight design requirements of automotive parts.

[0024] In this specific implementation, such as Figures 3 to 5 As shown, the closing locking mechanism includes a ball retainer 5, a ball pressure plate 6, a spring plate 8, and a spring pressure plate 9 sequentially mounted on the knurled shaft 3. The locking part 33 at the tail end of the knurled shaft 3 is threadedly connected to a nut 10. The nut 10 restricts one end of the spring plate 8 through the spring pressure plate 9. The other end of the spring plate 8 is pressed against the ball retainer 5 by the ball pressure plate 6. Balls 4 are provided in multiple through holes on the ball retainer 5, and the balls 4 are clamped between the lower page holder 2 and the spring pressure plate 9. Multiple protrusions 20 are provided on the end face of the lower page holder 2 facing the ball retainer 5. When the upper page holder 1 rotates to close the lower page holder 2 along the hinge mechanism, the balls 4 and the protrusions 20 are limited and abut against each other.

[0025] During the rotation and closing process of the upper page holder 1 along the lower page holder 2 via the knurled shaft 3 of the hinge mechanism, the tail end of the knurled shaft 3 is connected to the nut 10 through a threaded connection to limit the elastic deformation force on one side of the spring plate 8, so that the elastic deformation force of the spring plate 8 always presses against the ball bearing plate 6, so as to keep the ball 4 between the ball bearing plate 6 and the lower page holder 2. The ball bearing plate 6 presses against the end face of the lower page holder 2. The knurled shaft 3 drives the upper page holder 1 to rotate and close, so that the ball retainer 5, the ball bearing plate 6, the spring plate 8 and the spring plate 9, which are integrally and torque-connected with the knurled shaft 3, rotate synchronously, so that the ball 4 restricted in the ball retainer 5 moves towards the protrusion 20 synchronously and rotates to close, until the ball 4 and the protrusion 20 make a limiting contact. The two work together to generate resistance, which can realize the locking function of closing the upper page holder 1, which is convenient to operate.

[0026] During the process of the upper page holder 1 rotating and opening along the lower page holder 2 via the knurled shaft 3 of the hinge mechanism, the knurled shaft 3 drives the upper page holder 1 to rotate and open, so that the ball retainer 5, ball pressure plate 6, spring plate 8 and spring pressure plate 9, which are integrally and torque-connected with the knurled shaft 3, rotate synchronously, so that the balls 4 restricted in the ball retainer 5 rotate between adjacent protrusions 20 without affecting the rotation and opening operation of the upper page holder 1.

[0027] In this specific implementation, such as Figure 4 and Figure 5 As shown, rectangular holes are respectively opened at the center positions of the ball cage 5, the ball pressure plate 6, and the spring pressure plate 9. The torsion part 32 on the knurled shaft 3 is inserted into the rectangular holes. The length of the torsion part 32 is larger than the diameter of the locking part 33. By modifying the structural design of the knurled shaft 3, the ball cage 5, the ball pressure plate 6, and the spring pressure plate 9 can be easily installed and removed from the knurled shaft 3. The rectangular holes on each component are connected with the torque part to make the ball cage 5, the ball pressure plate 6, the spring plate 8, and the spring pressure plate 9, which are integrally torque-connected with the knurled shaft 3, rotate synchronously. The operation is convenient and has a high-efficiency linkage function.

[0028] In this specific implementation, such as Figure 5 As shown, a spring retainer 7 is provided at the center of the spring plate 8. A torsion part 32 on the knurled shaft 3 is inserted into the rectangular hole at the center of the spring retainer 7. The spring plate 8 is connected to the knurled shaft 3 by the spring retainer 7, which can also keep the rotation of the spring plate 8 stable, so as to ensure that the elastic pressure generated by the spring plate 8 on the ball bearing plate 6 is uniform.

[0029] Example 2 Please see Figures 6 to 9As shown, the present invention also provides another implementation of the closing locking mechanism. The closing locking mechanism includes a locking plate 14, a ball retainer 15, and a high-carbon manganese spring steel 16 sequentially mounted on the knurled shaft 3. The locking part 33 at the tail end of the knurled shaft 3 is threadedly connected to a nut 10. The nut 10 abuts against and restricts one end of the high-carbon manganese spring steel 16, and the other end of the high-carbon manganese spring steel 16 presses tightly against the ball retainer 15. A plurality of through holes opened on the ball retainer 15 are provided with balls 4, and the balls 4 are clamped... The upper page frame 1 is tightly installed between the locking plate 14 and the high carbon manganese spring steel 16. The locking plate 14 is fixedly installed on the lower page frame 2. When the upper page frame 1 rotates to the lower page frame 2 along the hinge mechanism to close, the ball bearing 4 presses against the locking hole 140 opened on the locking plate 14. The diameter of the locking hole 140 is smaller than the diameter of the ball bearing 4. When the upper page frame 1 rotates to the lower page frame 2 along the hinge mechanism to open, the ball bearing 4 slides along the arc-shaped sliding hole 141 opened on the locking plate 14. The width of the arc-shaped sliding hole 141 is smaller than the diameter of the ball bearing 4.

[0030] During the rotation and closing process of the upper page holder 1 along the lower page holder 2 via the knurled shaft 3 of the hinge mechanism, the tail end of the knurled shaft 3 restricts the elastic deformation force on one side of the high carbon manganese spring steel 16 through the threaded nut 10, so that the elastic deformation force of the high carbon manganese spring steel 16 always exerts a tight pressure on the ball retainer 15 and the ball 4, so as to keep the ball 4 between the high carbon manganese spring steel 16 and the locking plate 14. The knurled shaft 3 drives the upper page holder 1 to rotate and close, so that the ball, which is integrally torque-connected with the knurled shaft 3, The second retainer 15 and the high-carbon manganese spring steel 16 rotate synchronously, while the locking plate 14 can be fixedly installed on the lower page frame 2 by rivets 13 to fix the position of the locking plate 14. The balls 4 restricted in the ball retainer 15 move synchronously toward the locking hole 140 and rotate to close until the balls 4 reach the locking hole 140 on the locking plate 14 and are tightly pressed and restricted in the locking hole 140 for locking. The two work together to generate resistance, which can realize the function of closing and locking the upper page frame 1. The operation is convenient.

[0031] During the process of the upper page holder 1 rotating and opening along the lower page holder 2 via the knurled shaft 3 of the hinge mechanism, the knurled shaft 3 drives the upper page holder 1 to rotate and open, so that the ball retainer 15 and the high carbon manganese spring steel 16, which are integrally and torque-connected with the knurled shaft 3, rotate synchronously. This allows the balls 4, which are restricted in the ball retainer 15, to move along the arc-shaped sliding hole 141 on the locking plate 14, without affecting the rotation and opening operation of the upper page holder 1, and ensuring the stability of the rotation and opening of the upper page holder 1.

[0032] Compared with Embodiment 1, Embodiment 2 does not require a protrusion on the lower page holder 2, thus avoiding wear on the protrusion and the inconvenience of replacing or repairing the lower page holder 2 due to severe wear. Furthermore, the closing locking mechanism in Embodiment 2 reduces the use of the ball bearing plate 6, spring retainer 7, and spring plate 9, further reducing the weight of the central armrest structure and meeting the lightweight design requirements of automotive parts.

[0033] It is necessary to understand that, such as Figure 10 As shown, in this embodiment 2, the locking plate 14 can be made without the need for a locking hole 140 and the arc-shaped sliding hole 141 can be adjusted to an arc-shaped sliding groove 142. During the rotation and closing process of the upper page frame 1 along the lower page frame 2 via the knurled shaft 3 of the hinge mechanism, the ball retainer 15 and the high-carbon manganese spring steel 16, which are integrally and torque-connected with the knurled shaft 3, rotate synchronously. This causes the balls 4, which are restricted within the ball retainer 15, to rotate and close synchronously along the arc-shaped sliding groove 142 until the balls 4 reach the root position of the arc-shaped sliding groove 142, thereby locking the balls 4 at the closed position. The ball bearing 4 and the root of the arc-shaped slide 142 cooperate to generate resistance, which can realize the locking function of closing the upper page holder 1, making operation convenient. During the process of the upper page holder 1 rotating and opening along the lower page holder 2 through the knurled shaft 3 of the hinge mechanism, the knurled shaft 3 drives the upper page holder 1 to rotate and open, so that the ball retainer 15 and the high carbon manganese spring steel 16, which are integrally torque-connected with the knurled shaft 3, rotate synchronously, so that the ball bearing 4 restricted in the ball retainer 15 can move along the arc-shaped slide 142 without affecting the rotation and opening operation of the upper page holder 1, and can ensure the stability of the rotation and opening of the upper page holder 1.

[0034] In this specific embodiment, rectangular holes are respectively opened at the center positions of the ball cage 15 and the high carbon manganese spring steel 16. The torsion part 32 on the knurled shaft 3 is inserted into the rectangular holes. The length of the torsion part 32 is larger than the diameter of the locking part 33. By modifying the structural design of the knurled shaft 3, the ball cage 15 and the high carbon manganese spring steel 16 are easy to install and remove on the knurled shaft 3. The rectangular holes on each component are connected with the torque part to make the ball cage 15 and the high carbon manganese spring steel 16, which are integrally torque-connected with the knurled shaft 3, rotate synchronously. The operation is convenient and has a highly efficient linkage function.

[0035] In this specific embodiment, the high-carbon manganese spring steel 16 is integrally structured with multiple protruding pressure parts 160. The protruding pressure parts 160 are used to press and abut the balls 4 inside the ball cage 2 15. By providing protruding pressure parts 160 on the outer contour of the high-carbon manganese spring steel 16, the ball 4 can be restricted and pressed, thereby reducing the structural weight of the high-carbon manganese spring steel 16. At the same time, the rotational stability of the high-carbon manganese spring steel 16 can be maintained, so as to ensure that the elastic pressure generated by the high-carbon manganese spring steel 16 on the ball cage 2 15 and the balls 4 is uniform and consistent.

[0036] In Examples 1 and 2, the implementation method of flipping and hovering between the upper page holder 1 and the lower page holder 2 via a hinge mechanism will be described in detail below.

[0037] like Figure 11 and Figure 12 As shown, the hinge mechanism includes a friction plate 11 fixedly mounted on the lower page holder 2 by a rivet 13. The friction plate 11 is interference-fitted with the interference portion 31 of the knurled shaft 3, and the spline portion 30 on the knurled shaft 3 is interference-fitted with the hinge shaft hole of the upper page holder 1. The knurled shaft 3 is interference-fitted with the upper page holder 1 and the friction plate 11 respectively, so that when the upper page holder 1 is rotated open, the knurled shaft 3 can be rotated as a whole, so that the knurled shaft 3 can be flipped along the friction plate 11. The friction plate 11 is an elastic metal part. After being flipped to the required angle position, the friction plate 11 returns to its original position and, under the interference fit connection between it and the knurled shaft 3, the knurled shaft 3 can be locked at the flip angle position, so that the upper page holder 1 and the installed armrest cover are suspended at the flip angle position, and the upper page holder 1 is rotated open and suspended along the lower page holder 2.

[0038] During the connection process between the knurled shaft 3 and the friction plate 11, such as Figure 12 As shown, the friction plate 11 is provided with an elastic locking part 110 with a gap between the upper and lower parts. The upper and lower elastic locking parts 110 form a damping hole 111. The interference part 31 of the knurled shaft 3 is connected to the damping hole 111 with an interference fit. There is a tensioning notch between the upper and lower elastic locking parts 110 so that after the knurled shaft 3 is flipped to the required angle position, the upper and lower elastic locking parts 110 elastically reset to friction damping hinge the knurled shaft 3, so that the knurled shaft 3 reaches the flipping angle position and locks, so that the upper page frame 1 and the installed armrest cover plate are suspended at the flipping angle position, so that the upper page frame 1 can rotate and open along the lower page frame 2 and be suspended. The operation of rotating and opening the upper page frame 1 and self-locking suspension is convenient.

[0039] During the connection process between the knurled shaft 3 and the friction plate 11, such as Figure 12 As shown, a washer 12 is also fitted on the interference fit 31. The washer 12 is clamped between the upper page holder 1 and the friction plate 11. During the frequent flipping and hovering of the upper page holder 1, the washer 12 can prevent the upper page holder 1 from contacting the friction plate 11, so as to prevent the friction plate 11 from being worn more quickly.

[0040] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A central armrest hinge with a closing locking function, characterized in that, include: Top shelf (1); Next page shelf (2); A hinge mechanism is provided at both ends of the lower page holder (2), and the upper page holder (1) and the lower page holder (2) are rotatably connected by the hinge mechanism; A closing locking mechanism is provided at the tail end of the knurled shaft (3) included in the hinge mechanism and is integrally and torsionalally connected to the knurled shaft (3). When the upper page holder (1) rotates and closes along the hinge mechanism toward the lower page holder (2), the closing locking mechanism locks the closed position between the upper page holder (1) and the lower page holder (2). The closing locking mechanism includes a ball retainer (5), a ball pressure plate (6), a spring plate (8), and a spring pressure plate (9) sequentially mounted on the knurled shaft (3). The locking part (33) at the tail end of the knurled shaft (3) is threadedly connected to a nut (10). The nut (10) restricts one end of the spring plate (8) through the spring pressure plate (9). The other end of the spring plate (8) is pressed against the ball retainer (5) through the ball pressure plate (6). Balls (4) are provided in the multiple through holes opened on the ball retainer (5). The ball (4) is clamped between the lower page holder (2) and the spring pressure plate (9). The lower page holder (2) has a plurality of protrusions (20) on its end face facing the ball holder (5). When the upper page holder (1) rotates to the lower page holder (2) along the hinge mechanism, the ball (4) and the protrusions (20) are mutually limited and abutted. The ball holder (5), the ball pressure plate (6) and the spring pressure plate (9) are each provided with a rectangular hole at their center. The torsion part (32) on the knurled shaft (3) is inserted into the rectangular hole. The length of the torsion part (32) is greater than the diameter of the locking part (33). The spring plate (8) is provided with a spring holder (7) at its center. The torsion part (32) on the knurled shaft (3) is inserted into the rectangular hole at the center of the spring holder (7).

2. A central armrest hinge with a closing locking function according to claim 1, characterized in that, The closing locking mechanism includes a locking plate (14), a ball retainer (15), and a high-carbon manganese spring steel (16) sequentially mounted on the knurled shaft (3). The locking part (33) at the tail end of the knurled shaft (3) is threadedly connected to a nut (10). The nut (10) abuts against and restricts one end of the high-carbon manganese spring steel (16), and the other end of the high-carbon manganese spring steel (16) presses against the ball retainer (15). Multiple through holes on the ball retainer (15) are provided with balls (4), and the balls (4) are clamped and mounted on the locking plate (14) and the high-carbon manganese spring steel (16). Between, the locking plate (14) is fixedly installed on the lower page holder (2). When the upper page holder (1) rotates to close along the hinge mechanism towards the lower page holder (2), the ball (4) presses tightly against the locking hole (140) opened on the locking plate (14). The diameter of the locking hole (140) is smaller than the spherical diameter of the ball (4). When the upper page holder (1) rotates to open along the hinge mechanism towards the lower page holder (2), the ball (4) slides along the arc-shaped sliding hole (141) opened on the locking plate (14). The width of the arc-shaped sliding hole (141) is smaller than the spherical diameter of the ball (4).

3. A central armrest hinge with a closing locking function according to claim 2, characterized in that, Rectangular holes are respectively opened at the center positions of the ball retainer (15) and the high carbon manganese spring steel (16). The torsion part (32) on the knurled shaft (3) is inserted into the rectangular holes. The length of the torsion part (32) is greater than the diameter of the locking part (33).

4. A central armrest hinge with a closing locking function according to claim 2, characterized in that, The high carbon manganese spring steel (16) has a plurality of raised pressure parts (160) on an integral structure, the raised pressure parts (160) being used to press against the balls (4) inside the ball retainer (15).

5. A central armrest hinge with a closing locking function according to claim 1, characterized in that, The hinge mechanism includes a friction plate (11) which is fixedly mounted on the lower page holder (2) by a rivet (13). The friction plate (11) is interference-fitted to the interference portion (31) of the knurled shaft (3), and the spline portion (30) on the knurled shaft (3) is interference-fitted to the hinge shaft hole of the upper page holder (1).

6. A central armrest hinge with a closing locking function according to claim 5, characterized in that, The friction plate (11) is provided with an elastic locking part (110) with a gap between the upper and lower elastic locking parts (110), and a damping hole (111) is formed between the upper and lower elastic locking parts (110). The interference part (31) of the knurled shaft (3) is connected to the damping hole (111) by interference fit.

7. A central armrest hinge with a closing locking function according to claim 5, characterized in that, A washer (12) is also fitted onto the interference fit (31), and the washer (12) is clamped between the upper page holder (1) and the friction plate (11).

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