Vehicle-mounted rear-row handrail screen double-wire rod lifting clamping mechanism

Abstract

The utility model relates to a kind of double-screw rod lifting clamping mechanisms of vehicle-mounted rear row handrail screen, including base, motor, clutch assembly, gear nut lifting assembly, cam assembly, guide component and magnetic attraction component;Clutch assembly connects gear nut lifting assembly;Gear nut lifting assembly includes left screw rod, right screw rod, left nut and right nut, left nut and right nut are mutually engaged;Cam assembly includes left jaw and right jaw, cam face is respectively provided on left nut and right nut, and cam groove, which is matched with cam face, is provided on left jaw and right jaw;Guide component includes guide rod, guide hole and spring;Magnetic attraction component is located on screen support;Motor is fixed on base, and output shaft connects clutch assembly.The utility model provides a kind of double-screw rod lifting clamping mechanisms of vehicle-mounted rear row handrail screen, realizes automation lifting and clamping by structural improvement, improves operation convenience and reliability.

Description

Technical Field

[0001] This utility model relates to the field of vehicle electronic equipment, and in particular to a dual-screw lifting and clamping mechanism for a vehicle rear armrest screen. Background Technology

[0002] With the development of the automotive industry, the use of rear armrest screens in vehicles has become increasingly common. However, in current technology, rear armrest screens typically lack a fixed storage location, requiring passengers to search for or use them from specific locations, causing inconvenience. Some existing devices use simple mechanical structures to achieve armrest height adjustment, but they often cannot simultaneously achieve automated lifting and reliable clamping, and are prone to damage to transmission components under external forces, affecting service life and user experience. Furthermore, some existing armrest screen devices with lifting functions typically use flexible wires for electrical connections, which require repeated bending during lifting, posing a risk of wear and breakage and affecting service life. Meanwhile, existing clamping devices often use independent drive sources, resulting in complex structures, large space requirements, and high costs, making them difficult to ideally arrange in the limited space of a vehicle. Therefore, designing a compact, reliable, and overload-protected automated lifting and clamping integrated device has become a technical problem that needs to be solved in this field. Utility Model Content

[0003] In view of this, the present invention provides a dual-screw lifting and clamping mechanism for the rear armrest screen of a vehicle, which achieves automated lifting and clamping through structural improvements, thereby improving the ease of operation and reliability.

[0004] The objective of this utility model is achieved through the following technical solution: A dual-screw lifting and clamping mechanism for a vehicle rear armrest screen includes a base, a motor, a clutch assembly, a gear and screw nut lifting assembly, a cam assembly, a guide assembly, and a magnetic suction assembly. The clutch assembly is connected to the gear and screw nut lifting assembly. The gear and screw nut lifting assembly includes a left screw, a right screw, a left screw nut, and a right screw nut, which mesh with each other. The cam assembly includes a left jaw and a right jaw, with cam surfaces on the left and right screw nuts and cam grooves on the left and right jaws that mate with the cam surfaces. The guiding assembly includes a guide rod fixedly connected to the screen bracket, a guide hole disposed on the base and slidably engaged with the guide rod, and a spring sleeved on the guide rod; the magnetic suction assembly is disposed on the screen bracket; the motor is fixed on the base, and its output shaft is connected to a clutch assembly, and is configured to sequentially drive the left and right grippers to move in opposite directions to release, the screen bracket to rise and fall, and the left and right grippers to move towards each other to clamp through the cooperation of the clutch assembly, the gear nut lifting assembly, and the cam assembly.

[0005] This device integrates multiple components to achieve automated lifting and clamping. The motor drives the clutch assembly, which in turn drives the gear and screw nut lifting assembly. The double screw structure ensures synchronous lifting. The cam surface drives the gripper to move laterally to complete clamping or releasing. The guide assembly provides stable guidance, and the magnetic component prevents the armrest screen from sliding. The overall structure is compact, the operation is smooth, and the convenience and safety of operation are improved, solving the problem of storing the rear armrest screen.

[0006] Preferably, the clutch assembly includes a splined shaft, a torsion spring, and a screw thread gear. The torsion spring provides a preload to ensure a tight fit between the splined shaft and the screw thread gear. The preload of the torsion spring is greater than the driving force of the motor.

[0007] The clutch assembly achieves a tight fit between the spline shaft and the screw thread gear through the preload of the torsion spring. The preload is greater than the motor driving force, and the clutch automatically disengages in case of overload, protecting the transmission components, avoiding damage, and improving the safety and durability of the device.

[0008] Preferably, the clutch assembly is configured such that when the mechanism is subjected to an external overload force, the spline shaft separates from the nut gear to protect the transmission components.

[0009] The clutch assembly disengages under external overload force to prevent damage to transmission components, and automatically re-engages after the external force disappears, eliminating the need for manual reset, thus enhancing reliability, ease of maintenance, and extending service life.

[0010] Preferably, the left and right nuts are each provided with a transmission gear, which meshes with each other.

[0011] The left and right lead screw nuts are meshed through a transmission gear to ensure synchronous rotation, which drives the lead screw to rise and fall in unison, avoiding tilting, improving the smoothness and accuracy of the movement, and reducing wear and noise.

[0012] Preferably, the cam surface of the cam assembly cooperates with the cam groove, so that when the nut rotates, it drives the gripper to move laterally, thereby achieving clamping or releasing action.

[0013] The cam surface and cam groove work together to convert rotational motion into lateral movement, achieving reliable clamping or releasing. The structure is simple, the operation is smooth, the clamping force is uniform, improving operating efficiency and protecting the armrest screen.

[0014] Preferably, the guide assembly includes four guide rods, which are fixedly connected to the four corners of the screen bracket, and the guide rods pass through the guide holes of the base and can slide up and down.

[0015] Four guide rods are fixed at the four corners of the screen bracket and slide through guide holes to provide stable guidance, prevent shaking, ensure lifting accuracy and smoothness, and enhance structural rigidity.

[0016] Preferably, the spring is sleeved on the guide rod and located between the fixed block and the base, providing guidance and reset during the lifting and lowering of the screen bracket.

[0017] The spring on the guide rod provides guidance and reset functions, buffers shocks, makes lifting and lowering smooth and quiet, assists in position recovery, and improves motion reliability and user experience.

[0018] Preferably, the magnetic attraction component includes a plurality of magnets and a screen support plate fixedly mounted on the screen bracket.

[0019] Multiple magnets are fixed to the screen support plate, reliably adsorbing the armrest screen, preventing it from sliding off, balancing the adsorption force, simplifying the structure, and improving safety and convenience.

[0020] Preferably, the screen bracket is connected to the base via the guide component and can move up and down relative to the base.

[0021] The screen bracket is connected to the base through a guide component, enabling stable lifting and moving, avoiding deviation, facilitating user access, reducing wear and tear, and adapting to the needs of the vehicle environment.

[0022] Preferably, the base is provided with a limiting structure, so that when the screen bracket rises to the limit position, the fixing block contacts and limits the contact with the base.

[0023] The base limiting structure restricts the upward stroke through contact with a fixed block to prevent over-lifting. This mechanical method is simple and reliable, ensuring safe operation and reducing costs.

[0024] The advantages of this utility model compared to the prior art are: This utility model discloses a dual-screw lifting and clamping mechanism for the rear armrest screen in a vehicle. By integrating multiple components to form a compact mechanical transmission system, it enables automated lifting and clamping of the rear armrest screen. A motor-driven clutch assembly drives the gear-nut lifting assembly. The dual-screw structure ensures synchronous movement of the left and right screws, resulting in smooth lifting and lowering of the screen bracket. The cam surface and cam groove cooperate to convert the rotational motion of the nut into the lateral movement of the gripper, achieving reliable clamping or releasing. The guide assembly provides stable guidance and reset functions through guide rods and springs, reducing swaying and offset during movement. The magnetic component uses magnets to attract the armrest screen, preventing slippage or falling. The overall structure features low operating noise, stable transmission, and adaptability to the needs of the in-vehicle environment, improving operational efficiency and user experience.

[0025] This device sequentially drives the clutch assembly, gear and screw nut lifting assembly, and cam assembly via a single motor, achieving a continuous sequential action of gripper release, screen bracket lifting, and gripper clamping. This simplifies the control system and reduces manufacturing costs. The dual-screw and gear meshing structure ensures synchronous operation of both sides of the screen bracket during lifting, effectively preventing jamming and abnormal noise. The torsion spring preload design in the clutch assembly provides a reliable overload protection mechanism, automatically disengaging when encountering unexpected resistance and automatically resetting after the external force disappears, improving the device's adaptability and durability in complex operating environments. The multi-point arrangement of the guide assembly, combined with the magnetic attraction of the magnetic component, ensures the stability of the armrest screen in both lifting and stationary states, enhancing the user's operating feel and sense of security. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of a dual-screw lifting and clamping mechanism for a vehicle rear armrest screen according to an embodiment of this utility model.

[0028] Figure 2 This is a cross-sectional view of a dual-screw lifting and clamping mechanism for a vehicle rear armrest screen according to an embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional view of the clutch component area of ​​the dual-screw lifting and clamping mechanism for the rear armrest screen of a vehicle according to an embodiment of the present invention.

[0030] Figure 4 This is a structural diagram of the gear screw lifting assembly of the dual screw lifting clamping mechanism for the rear armrest screen in a vehicle according to an embodiment of this utility model.

[0031] Figure 5 This is a cross-sectional view of the gear screw lifting assembly of the dual screw lifting clamping mechanism for the rear armrest screen of a vehicle according to an embodiment of the present invention.

[0032] Figure 6 This is a cross-sectional view of the guide component area of ​​the dual-screw lifting and clamping mechanism for the rear armrest screen of a vehicle according to an embodiment of the present invention.

[0033] Figure 7 This is a cross-sectional view of the magnetic component area of ​​the dual-screw lifting and clamping mechanism for the rear armrest screen of a vehicle according to an embodiment of the present invention.

[0034] Labeling Explanation: 1. Base, 2. Motor, 3. Splined Shaft, 4. Torsion Spring, 5. Lead Screw Gear, 6. Left Lead Screw, 7. Right Lead Screw, 8. Left Lead Screw Nut, 9. Right Lead Screw Nut, 10. Left Clamp, 11. Right Clamp, 12. Guide Rod, 13. Spring, 14. Magnet, 15. Screen Bracket, 16. Transmission Gear, 17. Fixing Block, 18. Cam Surface, 19. Clutch Shaft, 20. Armrest Screen, 21. Screen Support Plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0039] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0040] This embodiment provides a dual-screw lifting and clamping mechanism for a vehicle rear armrest screen, including a base 1, a motor 2, a clutch assembly, a gear screw nut lifting assembly, a cam assembly, a guide assembly, and a magnetic suction assembly; the clutch assembly is connected to the gear screw nut lifting assembly; the gear screw nut lifting assembly includes a left screw 6, a right screw 7, a left screw nut 8, and a right screw nut 9, with the left screw nut 8 and right screw nut 9 meshing with each other; the cam assembly includes a left jaw 10 and a right jaw 11, with cam surfaces respectively provided on the left screw nut 8 and right screw nut 9, and cams on the left jaw 10 and right jaw 11 that cooperate with the cam surfaces 18. The guide assembly includes a guide rod 12 fixedly connected to the screen bracket 15, a guide hole disposed on the base 1 and slidably engaged with the guide rod 12, and a spring 13 sleeved on the guide rod 12; a magnetic suction assembly is disposed on the screen bracket 15 for adsorbing and fixing the armrest screen 20; the motor 2 is fixed on the base 1, and its output shaft is connected to the clutch assembly, and is configured to sequentially drive the left gripper 10 and the right gripper 11 to move in opposite directions to release, the screen bracket 15 to rise and fall, and the left gripper 10 and the right gripper 11 to move towards each other to clamp through the cooperation of the clutch assembly, the gear nut lifting assembly and the cam assembly. Specifically, the cam surface 18 is a three-dimensional curved surface or inclined surface structure formed on the outer peripheral wall of the left nut 8 and the right nut 9. When the left lead screw nut 8 and the right lead screw nut 9 rotate, the cam surface 18 on them generates relative motion with the cam grooves on the left gripper 10 and the right gripper 11. Through the guiding effect of the curved or inclined surface, the rotational motion of the lead screw nut is converted into the transverse linear motion of the gripper along the direction perpendicular to the lead screw axis, thereby realizing the switching between clamping and releasing. The profile of the cam surface 18 is configured such that when the left lead screw nut 8 and the right lead screw nut 9 rotate, the left gripper 10 and the right gripper 11 are first driven to move laterally to complete the release or clamping action, and then the left lead screw 6 and the right lead screw 7 are driven to rotate to raise and lower the screen bracket 15.

[0041] Driven by a single motor, the device achieves automatic sequential control of two working modes: "picking up" and "storing". Its core lies in the profile design of the cam surface 18, which ensures the sequential execution of "gripper action" and "support lifting".

[0042] 1. Access Mode: When the armrest screen 20 needs to be accessed, the motor 2 starts. Power is transmitted through the clutch assembly, driving the left nut 8 and the right nut 9 to rotate synchronously.

[0043] First, the release action is performed: In the initial stage of rotation, due to the engagement between the cam surface 18 and the cam groove, and the resistance of the cam drive (such as overcoming the clamping force or spring preload) being greater than the initial resistance of the lead screw lifting and lowering, the rotational motion of the left lead screw nut 8 and the right lead screw nut 9 is converted into the lateral opposite movement of the left gripper 10 and the right gripper 11, thereby releasing the handrail screen 20. During this stage, there is no relative rotation between the lead screw nut and the lead screw, and the screen support 15 remains stationary.

[0044] Subsequently, the lifting action is performed: After the gripper moves to the fully released position, the cam surface 18 enters the anti-rotation section or transition section, and the resistance increases. At this time, the torque of the motor overcomes the resistance of the lead screw, driving the left lead screw nut 8 and the right lead screw nut 9 to rotate relative to the left lead screw 6 and the right lead screw 7, thereby driving the screen bracket 15 and the armrest screen 20 attached to it to rise smoothly.

[0045] Once the screen bracket reaches the predetermined height, the motor stops, and the user can then remove the armrest screen 20.

[0046] 2. Storage mode: When the user places the armrest screen 20 back into the screen bracket 15 and it is attracted by the magnetic component, the motor 2 starts in reverse.

[0047] First, the descent action is executed: the motor drives the screen bracket 15 to descend. At this time, the cam mechanism is in a released or transitional state, and the power is primarily used to drive the lead screw to rotate, causing the screen bracket 15 to descend.

[0048] Subsequently, the clamping action is performed: After the screen bracket descends to its bottom limit position, the lead screw can no longer rotate. The motor continues to run, the torque increases, which in turn forces the cam surface 18 to move in the cam groove, driving the left gripper 10 and the right gripper 11 to move towards each other, finally reliably clamping and fixing the armrest screen 20.

[0049] The key mechanism for achieving sequential actions: The profile of cam surface 18 is designed with a specific helix angle and stroke. It engages with the cam grooves on the left gripper 10 and right gripper 11 to achieve the aforementioned sequential actions. Specifically, the stroke of cam surface 18 matches the lead of the lead screw thread, ensuring that within a rotation cycle, the lateral movement of the grippers precedes the lifting and lowering movement of the lead screw. Similarly, in the reverse motion, the descent of the screen bracket 15 also precedes the clamping action of the grippers.

[0050] This device integrates a base 1, a motor 2, a clutch assembly, a gear and screw nut lifting assembly, a cam assembly, a guide assembly, and a magnetic suction assembly to form a complete mechanical transmission system, enabling automated lifting and clamping of the rear armrest screen 20. The motor 2 serves as the power source, driving the clutch assembly, which transmits power to the gear and screw nut lifting assembly. The left screw nut 8 and right screw nut 9 in the gear and screw nut lifting assembly mesh with each other, ensuring synchronous movement of the left and right screws, thereby driving the screen support 15 to rise and fall smoothly. The cam surface 18 in the cam assembly engages with the cam groove, causing the left and right grippers 10 and 11 to move laterally when the screw nut rotates, achieving clamping or releasing. This design avoids the inconvenience of traditional soft wires or manual operation, improving operational efficiency and user experience. The guide assembly, through the structure of the guide rod 12 and spring 13, provides stable guidance and reset functions for the screen support 15, preventing swaying or deviation during lifting and ensuring motion accuracy. The magnetic suction component is mounted on the screen bracket 15, which can reliably hold the armrest screen 20, preventing it from sliding or falling off during lifting or clamping, thus enhancing overall safety. The overall structure is compact, operates with low noise, and has stable transmission, making it suitable for in-vehicle environments. It solves the problem of the lack of a fixed storage location for the rear armrest screen 20, allowing drivers and passengers to conveniently store and retrieve it. At the same time, the rational layout of the mechanical components reduces manual intervention, improving the reliability and service life of the device.

[0051] In this embodiment, the clutch assembly includes a splined shaft 3, a torsion spring 4, and a screw thread nut 5. The torsion spring 4 provides a preload force to ensure a tight fit between the splined shaft 3 and the screw thread nut 5. The preload force of the torsion spring 4 is greater than the driving force of the motor 2. The splined shaft 3 is mounted on the clutch shaft 19.

[0052] The clutch assembly employs a combination of a splined shaft 3, a torsion spring 4, and a lead screw nut gear 5. The torsion spring 4 provides preload to ensure a tight fit between the splined shaft 3 and the lead screw nut gear 5. This design transmits power to the motor 2 during normal operation. However, when the mechanism is subjected to external overload, the preload of the torsion spring 4 is overcome, and the splined shaft 3 separates from the lead screw nut gear 5, thus preventing the transmission components from bearing excessive load and preventing damage to parts. The preload of the torsion spring 4 is greater than the driving force of the motor 2, ensuring stable operation of the transmission system under normal conditions, while automatically triggering the clutch function in abnormal situations, improving the adaptability and safety of the device and extending its overall service life.

[0053] The preload of the torsion spring 4 is determined by calculation or experiment to ensure that the spline shaft 3 and the screw thread gear 5 remain engaged within the rated torque of the motor 2, and automatically disengage when the external overload force exceeds the maximum torque of the motor.

[0054] In this embodiment, the clutch assembly is configured such that when the mechanism is subjected to an external overload force, the spline shaft 3 separates from the screw thread gear 5 to protect the transmission components.

[0055] The clutch assembly is specifically configured to separate the splined shaft 3 from the lead screw nut 5 under external overload. This overload protection mechanism effectively prevents transmission components such as gears and lead screws from being damaged by external impacts. When the mechanism is subjected to accidental abuse, the clutch action occurs promptly, distributing the load and avoiding breakage or wear caused by hard contact. After the external force disappears, the elastic restoring force of the torsion spring 4 causes the splined shaft 3 and lead screw nut 5 to re-engage, and the mechanism automatically returns to its original state without additional reset operation. This improves the durability and reliability of the device and reduces maintenance requirements.

[0056] In this embodiment, the left nut 8 and the right nut 9 are respectively provided with transmission gears 16, which mesh with each other.

[0057] The left lead screw nut 8 and the right lead screw nut 9 are connected by a transmission gear 16, ensuring that the left and right lead screws rotate synchronously, thereby driving the left and right lead screws to rise and fall in unison, preventing the screen bracket 15 from tilting or jamming during movement. This gear meshing design simplifies the transmission structure, improves the smoothness of movement, reduces wear and noise caused by asynchrony, and makes the lifting action more precise and reliable, suitable for the stability requirements of the vehicle environment.

[0058] In this embodiment, the cam surface 18 of the cam assembly cooperates with the cam groove, so that when the nut rotates, it drives the gripper to move laterally, thereby achieving clamping or releasing action.

[0059] The cam surface 18 of the cam assembly engages with the cam groove to convert the rotational motion of the screw nut into the lateral linear movement of the gripper, achieving clamping or releasing actions. This mechanical conversion method is simple in structure, reliable in operation, and requires no complex control system. The design of the cam surface 18 ensures the smoothness and consistency of the gripper movement, and the uniform distribution of clamping force, preventing damage to the armrest screen 20 during clamping. At the same time, the gripper quickly resets when released, improving operational efficiency. The overall structure is compact and suitable for vehicle installation environments with limited space.

[0060] The profile of the cam surface 18 has a specific helix angle, and its stroke matches the lead of the lead screw thread, so that the lateral movement of the gripper is completed before the lifting and lowering movement of the lead screw during the rotation cycle.

[0061] In this embodiment, the guide assembly includes four guide rods 12, which are fixedly connected to the four corners of the screen bracket 15. The guide rods 12 pass through the guide holes of the base 1 and can slide up and down.

[0062] The guide assembly consists of four guide rods 12 fixed to the four corners of the screen bracket 15, which slide up and down through guide holes in the base 1. This multi-point support design provides stable guidance for the screen bracket 15, preventing swaying or deflection during lifting. The arrangement of the guide rods 12 ensures uniform force distribution, reduces motion resistance, and improves lifting accuracy and smoothness. At the same time, the cooperation between the guide holes and the guide rods 12 limits unintended movement, enhancing the rigidity and reliability of the overall structure.

[0063] In this embodiment, the spring 13 is sleeved on the guide rod 12 and located between the fixing block 17 and the base 1, providing guidance and reset function during the lifting and lowering of the screen bracket 15.

[0064] Spring 13 is sleeved on guide rod 12 and located between fixed block 17 and base 1. During the lifting and lowering of screen bracket 15, it not only provides guidance but also assists in resetting through elastic force, buffering the impact of movement and making the lifting and lowering action smoother and quieter. The compression and release of spring 13 adapts to different load conditions, ensuring a smooth transition of screen bracket 15 when rising or falling, reducing mechanical vibration and noise. At the same time, it helps the mechanism return to its original position after the external force disappears, improving user experience and device durability.

[0065] In this embodiment, the magnetic attraction assembly includes a plurality of magnets 14, which are fixedly disposed on the support surface of the screen bracket 15. A screen support plate 21 is disposed on the support surface of the screen bracket 15, and the plurality of magnets 14 are disposed on the screen support plate 21. The magnetic assembly is fixed to the screen support plate 21 by multiple magnets 14, which can firmly attract the armrest screen 20 and prevent it from sliding or falling off during lifting or vehicle vibration. The even distribution of the magnets 14 ensures a balanced attraction force, enhancing the stability of the armrest screen 20. At the same time, the magnetic attraction method eliminates the need for a complex locking mechanism, simplifying the operation process and improving safety and convenience, making it suitable for scenarios with frequent access.

[0066] In this embodiment, the screen bracket 15 is connected to the base 1 via a guide component and can move up and down relative to the base 1.

[0067] The screen bracket 15 is connected to the base 1 via a guide assembly, enabling it to move up and down relative to the base 1. This design allows the screen bracket 15 to move smoothly under the constraint of the guide assembly, avoiding unexpected offset or tilting. The reliability of the lifting and moving mechanism ensures that users can easily access the armrest screen 20, while the guide assembly provides necessary support and guidance, reducing wear and extending the service life of the device. The overall structure adapts to the dynamic needs of the vehicle environment.

[0068] In this embodiment, the base 1 is provided with a limiting structure. When the screen bracket 15 rises to the limit position, the fixing block 17 contacts and limits the base 1.

[0069] The limiting structure on the base 1 contacts the base 1 via the fixing block 17, limiting the upward stroke of the screen bracket 15 and preventing damage or malfunction caused by excessive lifting. This mechanical limiting method is simple and reliable, requires no electronic sensors, reduces cost and complexity, and ensures that the lifting action is carried out within a safe range, improving the stability and safety of the overall device.

[0070] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-wire rod lifting clamping mechanism of a rear-row handrail screen for a vehicle, characterized in that, Includes a base (1), a motor (2), a clutch assembly, a gear and screw nut lifting assembly, a cam assembly, a guide assembly, and a magnetic suction assembly; The clutch assembly is connected to the gear screw nut lifting assembly; The gear screw lifting assembly includes a left screw (6), a right screw (7), a left screw nut (8), and a right screw nut (9), with the left screw nut (8) and the right screw nut (9) meshing with each other; The cam assembly includes a left jaw (10) and a right jaw (11), and a cam surface (18) is provided on the left nut (8) and the right nut (9), and a cam groove that cooperates with the cam surface (18) is provided on the left jaw (10) and the right jaw (11); The guide assembly includes a guide rod (12) fixedly connected to the screen bracket (15), a guide hole disposed on the base (1) and slidably engaged with the guide rod (12), and a spring (13) sleeved on the guide rod (12). The magnetic suction component is mounted on the screen bracket (15); The motor (2) is fixed on the base (1), and the output shaft is connected to the clutch assembly. It is configured to drive the left gripper (10) and the right gripper (11) to move in opposite directions to release, the screen bracket (15) to lift, and the left gripper (10) and the right gripper (11) to move towards each other to clamp through the cooperation of the clutch assembly, the gear screw lifting assembly and the cam assembly.

2. The double-wire rod lifting clamping mechanism of the rear-row handrail screen for vehicles according to claim 1, characterized in that, The clutch assembly includes a splined shaft (3), a torsion spring (4), and a screw thread gear (5). The torsion spring (4) provides a preload to make the splined shaft (3) and the screw thread gear (5) fit tightly together. The preload of the torsion spring (4) is greater than the driving force of the motor (2).

3. The dual-wire rod lifting clamping mechanism of the rear-row handrail screen for vehicles according to claim 2, characterized in that, The clutch assembly is configured such that when the mechanism is subjected to an external overload force, the spline shaft (3) separates from the threaded gear (5) to protect the transmission components.

4. The dual-screw lifting and clamping mechanism for the rear armrest screen of a vehicle according to claim 1, characterized in that, The left nut (8) and the right nut (9) are respectively provided with transmission gears (16), which mesh with each other.

5. The dual wire rod lift and clamp mechanism for rear armrest screen of a vehicle as claimed in claim 1 wherein, The cam surface (18) of the cam assembly cooperates with the cam groove, so that when the nut rotates, it drives the gripper to move laterally, thereby achieving clamping or releasing action.

6. The dual wire rod lift and clamp mechanism for rear armrest screen of a vehicle as claimed in claim 1 wherein, The guide assembly includes four guide rods (12), which are fixedly connected to the four corners of the screen bracket (15). The guide rods (12) pass through the guide holes of the base (1) and can slide up and down.

7. The dual-wire rod lifting clamping mechanism of the rear-row handrail screen for vehicles according to claim 6, characterized in that, The spring (13) is sleeved on the guide rod (12) and located between the fixed block (17) and the base (1), providing guidance and reset function during the lifting and lowering of the screen bracket (15).

8. The dual-screw lifting and clamping mechanism for the rear armrest screen of a vehicle according to claim 1, characterized in that, The magnetic suction assembly includes multiple magnets (14) and a screen support plate (21) fixedly mounted on the screen bracket (15).

9. The dual wire rod lift and clamp mechanism for rear armrest screen of a vehicle as claimed in claim 1, wherein, The screen bracket (15) is connected to the base (1) through the guide component and can move up and down relative to the base (1).

10. The dual wire rod lift and clamp mechanism for rear armrest screen of a vehicle as claimed in claim 1 wherein, The base (1) is provided with a limiting structure. When the screen bracket (15) rises to the limit position, the fixing block (17) contacts the base (1) and limits its movement.

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