Magnetic levitation frictionless angle holding mechanism for leg rest
Patent Information
- Application Number
- CN202522608107.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-12-09
AI Technical Summary
机械部件间的直接接触易产生持续摩擦，长期使用后不仅会造成部件磨损，导致机构使用寿命缩短、可靠性下降，还会伴随明显的运行噪音，尤其在角度调节回程阶段，棘轮与锁舌的配合易产生撞击异响，严重影响使用静谧性；
1、该腿托用磁悬浮无摩擦角度保持机构，通过设置的调节机构，当汽车的腿托在使用时，利用阵列永磁环与音圈绕组的电磁配合，实现转轴与外壳之间的无接触驱动，彻底消除了机械摩擦，减少了部件磨损和运行噪音，提高了机构的使用寿命和可靠性，同时，通过控制音圈绕组的电流，可以精细调节腿托的转动角度，满足用户个性化的舒适需求，操作灵活且响应迅速，磁悬浮结构的磁场力分布均匀，能对腿托本体形成稳定的支撑力，确保腿托在任意调节角度下均能精准保持位置，不会因外力轻微扰动而发生角度偏移，相较于棘轮和锁舌结构具有精度高，回程撞击声小，且避免了磨损后产生松旷异响的现象发生，转轴内部开设有圆形接线槽且呈空心设置，配合固定于支撑框内部的接线套，便于实现音圈绕组的规整布线，避免线路杂乱缠绕导致的故障风险。
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Figure CN224856799U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of leg support technology, specifically a magnetic levitation frictionless angle holding mechanism for leg supports. Background Technology
[0002] As an important comfort component in products such as car seats and medical care equipment, the angle adjustment and position holding functions of leg rests directly determine the user experience. Especially in the automotive field, as consumers' demands for driving comfort and personalization continue to increase, traditional leg rest angle holding mechanisms are gradually becoming unable to meet the requirements of practical applications. Currently, most mainstream leg support angle maintaining mechanisms on the market adopt mechanical contact structures such as ratchet, locking tongue, and gear meshing. These structures have obvious defects during operation: Direct contact between mechanical parts can easily generate continuous friction. After long-term use, this will not only cause wear and tear on the parts, leading to a shortened service life and reduced reliability of the mechanism, but also cause obvious operating noise. Especially during the angle adjustment return phase, the ratchet and locking tongue are prone to impact noise, which seriously affects the quietness of use. Mechanical contact adjustment relies on rigid fit between components. The angle adjustment accuracy is limited by machining errors, making it impossible to achieve fine angle control. It is difficult to adapt to the leg support needs of different users, resulting in insufficient personalized comfort. Existing leg support angle holding mechanisms have defects such as severe mechanical friction, high operating noise, short service life, low adjustment accuracy, messy wiring, easy failure, and inconvenient disassembly and assembly. Therefore, it is necessary to design a magnetic levitation frictionless angle holding mechanism for leg supports to solve the above problems. Utility Model Content
[0003] The purpose of this invention is to provide a magnetic levitation frictionless angle holding mechanism for leg supports, so as to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a magnetic levitation frictionless angle holding mechanism for a leg support, comprising a mounting arm, an adjustment mechanism on the left side of the mounting arm, and a fixing mechanism on the inner side of the adjustment mechanism; The adjustment mechanism includes a support frame, which is fixedly connected to the left side of the mounting arm. A rotating shaft is fixedly connected to the inner side of the support frame. A terminal sleeve is fixedly connected to the front side of the rotating shaft. A stator core is fixedly connected to the outer side of the rotating shaft. A voice coil winding is fixedly connected to the outer side of the stator core. A bearing body is fixedly connected to the outer side of the rotating shaft. A bearing seat is fixedly connected to the outer side of the bearing body. A housing is fixedly connected to the rear side of the bearing seat. An array of permanent magnet rings is fixedly connected to the inner side of the housing. A connecting arm is fixedly connected to the left side of the housing. A mounting base is fixedly connected to the top of the connecting arm. A leg support body is slidably connected to the top of the mounting base.
[0005] Preferably, the wiring sleeve is fixedly connected inside the support frame, the rotating shaft has a wiring groove inside, which is circular and hollow inside, and the outer shell is rotatably connected to the outer periphery of the rotating shaft, so as to drive the connecting arm and the mounting base to rotate through the outer shell.
[0006] Preferably, there are two sets of bearing housings and bearing bodies, which are symmetrically distributed on the front and rear sides of the outer casing, so as to facilitate the rotation of the bearing housing on the bearing body by the outer casing.
[0007] Preferably, the array of permanent magnet rings is located around the voice coil winding, and the inner side does not contact the outer side of the voice coil winding, so that the magnetic field is greatly enhanced on one side of the array under the action of the array of permanent magnet rings, while the magnetic field on the other side is almost zero.
[0008] Preferably, the voice coil winding is provided in three sets and symmetrically distributed around the stator core. This arrangement allows the three sets of windings to generate a rotating magnetic field when a three-phase sinusoidal current is applied to them.
[0009] Preferably, the fixing mechanism includes a limiting frame, which is inserted into the mounting base and the leg support body. A gasket is slidably connected to the periphery of the limiting frame, and the gasket is disposed on the rear side of the mounting base. A fixing sleeve is threadedly connected to the rear periphery of the limiting frame.
[0010] Preferably, the front side of the gasket is in contact with the rear side of the mounting base, which facilitates further ensuring the stability between the fixing sleeve and the limiting frame through the gasket.
[0011] Compared with the prior art, this utility model provides a magnetic levitation frictionless angle holding mechanism for leg supports, which has the following beneficial effects: 1. This leg rest uses a magnetic levitation frictionless angle holding mechanism. Through the set adjustment mechanism, when the car's leg rest is in use, the electromagnetic cooperation between the array of permanent magnet rings and the voice coil winding achieves contactless drive between the shaft and the outer shell, completely eliminating mechanical friction, reducing component wear and operating noise, and improving the service life and reliability of the mechanism. At the same time, by controlling the current of the voice coil winding, the rotation angle of the leg rest can be finely adjusted to meet the user's personalized comfort needs. The operation is flexible and responsive. The magnetic field force of the magnetic levitation structure is evenly distributed, which can form a stable support force on the leg rest body, ensuring that the leg rest can accurately maintain its position at any adjustment angle and will not deviate from the angle due to slight external disturbances. Compared with ratchet and locking tongue structures, it has higher precision, less return impact noise, and avoids the phenomenon of loose and abnormal noise after wear. The shaft has a circular wiring groove inside, which is hollow. With the wiring sleeve fixed inside the support frame, it is easy to realize the neat wiring of the voice coil winding and avoid the risk of failure caused by messy and tangled wires.
[0012] 2. The leg support uses a magnetic levitation frictionless angle holding mechanism. Through the set fixing mechanism, when the leg support body is in use and slidably connected to the top of the mounting base, the limiting frame can be inserted into the mounting base and the leg support body. Finally, the gasket is slid to the outer periphery of the limiting frame so that the front side of the gasket contacts the rear side of the mounting base. Finally, the fixing sleeve is threaded to the outer periphery of the rear end of the limiting frame, which can ensure the stability between the limiting frame and the mounting base and realize the quick installation and disassembly of the leg support body. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model from below; Figure 3 This is a schematic diagram of the adjustment mechanism. Figure 4 This is a schematic diagram of the outer structure of the rotating shaft; Figure 5 This is a schematic diagram of the left side of the outer shell; Figure 6 This is a schematic diagram of the cross-sectional structure of the outer shell; Figure 7 This is a schematic diagram of the fixed mechanism.
[0014] In the diagram: 1. Mounting arm; 2. Adjustment mechanism; 3. Fixing mechanism; 21. Support frame; 22. Rotating shaft; 23. Wiring sleeve; 24. Stator core; 25. Voice coil winding; 26. Array permanent magnet ring; 27. Housing; 28. Connecting arm; 29. Mounting base; 291. Leg support body; 292. Bearing seat; 293. Bearing body; 31. Limiting frame; 32. Gasket; 33. Fixing sleeve. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0017] This utility model provides the following technical solution: Example 1 Please see Figure 1-7 This utility model provides a technical solution: a magnetic levitation frictionless angle holding mechanism for a leg support, including a mounting arm 1, an adjustment mechanism 2 on the left side of the mounting arm 1, and a fixing mechanism 3 on the inner side of the adjustment mechanism 2; The adjustment mechanism 2 includes a support frame 21, which is fixedly connected to the left side of the mounting arm 1. A rotating shaft 22 is fixedly connected to the inner side of the support frame 21. A wiring sleeve 23 is fixedly connected to the front side of the rotating shaft 22. A stator core 24 is fixedly connected to the outer side of the rotating shaft 22. A voice coil winding 25 is fixedly connected to the outer side of the stator core 24. A bearing body 293 is fixedly connected to the outer side of the rotating shaft 22. A bearing seat 292 is fixedly connected to the outer side of the bearing body 293. A housing 27 is fixedly connected to the rear side of the bearing seat 292. An array of permanent magnet rings 26 is fixedly connected to the inner side of the housing 27. A connecting arm 28 is fixedly connected to the left side of the housing 27. A mounting base 29 is fixedly connected to the top of the connecting arm 28. A leg support body 291 is slidably connected to the top of the mounting base 29.
[0018] The wiring sleeve 23 is fixedly connected inside the support frame 21. The rotating shaft 22 has a wiring groove inside, which is circular and hollow. The outer shell 27 is rotatably connected to the outer periphery of the rotating shaft 22, so that the connecting arm 28 and the mounting base 29 can be rotated through the outer shell 27.
[0019] There are two sets of bearing housing 292 and bearing body 293, which are symmetrically distributed on the front and rear sides of housing 27, so that the bearing housing 292 can be driven to rotate on bearing body 293 through housing 27.
[0020] The array permanent magnet ring 26 is located outside the voice coil winding 25, and its inner side does not contact the outer side of the voice coil winding 25. This makes it easy for the magnetic field to be greatly enhanced on one side of the array under the action of the array permanent magnet ring 26, while the magnetic field on the other side is almost zero.
[0021] The voice coil winding 25 is provided in three sets and is symmetrically distributed around the stator core 24. By setting three sets, when a three-phase sinusoidal current is passed through the three sets of windings, they will jointly generate a rotating magnetic field.
[0022] Example 2 Please see Figure 1-7 Furthermore, based on Embodiment 1, the fixing mechanism 3 includes a limiting frame 31, which is inserted into the mounting base 29 and the leg support body 291. A gasket 32 is slidably connected to the periphery of the limiting frame 31, and the gasket 32 is located on the rear side of the mounting base 29. A fixing sleeve 33 is threadedly connected to the rear periphery of the limiting frame 31.
[0023] The front side of the gasket 32 contacts the rear side of the mounting base 29, which facilitates further stability between the fixing sleeve 33 and the limiting bracket 31 through the gasket 32.
[0024] In actual operation, when this device is used, when the car's leg rest is in use, first connect the mounting arm 1 to the fixed frame of the seat to ensure the stability of the mounting arm 1. The rotating shaft 22 has a circular wiring groove inside and is hollow. Together with the wiring sleeve 23 fixed inside the support frame 21, it is easy to realize the neat wiring of the voice coil winding 25, avoid the risk of failure caused by messy and tangled wires, and then power the voice coil winding 25. After fixing and wiring are completed, the leg support body 291 can be slid onto the top of the mounting base 29, the limiting bracket 31 can be inserted into the mounting base 29 and the leg support body 291, the gasket 32 can be slid to the outer periphery of the limiting bracket 31 so that the front side of the gasket 32 contacts the rear side of the mounting base 29, and the fixing sleeve 33 can be threaded onto the outer periphery of the rear end of the limiting bracket. This ensures the stability between the limiting bracket 31 and the mounting base 29 and enables the quick installation and disassembly of the leg support body 291. When the leg support body 291 is in use, the voice coil winding 25 is fixed on the stator core 24, and the stator core 24 is rigidly connected to the support frame 21 through the rotating shaft 22. When the voice coil winding 25 is energized, a controllable electromagnetic field is generated. Meanwhile, an array of permanent magnet rings 26 are fixed inside the outer shell 27, which generates a stable permanent magnetic field. The electromagnetic field of the voice coil winding 25 interacts with the permanent magnetic field of the array of permanent magnet rings 26 to generate electromagnetic torque, which drives the outer shell 27 to rotate around the shaft 22. The outer shell 27 also causes the bearing seat 292 to rotate on the bearing body 293, which in turn causes the outer shell 27 to rotate the connecting arm 28 and the mounting base 29 for angle adjustment. Since the array of permanent magnet rings 26 is located outside the voice coil winding 25 and the two have no physical contact, true frictionless motion is achieved. By adjusting the magnitude and direction of the current in the voice coil winding 25, the rotation angle and torque output of the housing 27 can be precisely controlled, thereby driving the connecting arm 28 and the leg support body 291 on the mounting base 29 to adjust the angle. After being adjusted to the desired angle, the current in the voice coil winding 25 can be maintained at a constant value, generating an electromagnetic torque that balances with the external load, so that the leg support body 291 is stabilized in the set position. Due to the magnetic levitation effect, the angle can be maintained without a mechanical braking device, avoiding sliding friction or gear wear in traditional mechanisms. The bearing body 293 and bearing housing 292 mainly serve as auxiliary support and guide, but are not the main load-bearing components. The core load is borne by the magnetic levitation field, ensuring long-term reliability and quietness. When energized, it generates levitation torque, and the voice coil winding 25 locks when de-energized. It has good angle holding torque effect, zero mechanical wear, and low no-load noise. Compared with ratchet and locking tongue structures, it has high precision, low return impact noise, and avoids the phenomenon of loose and abnormal noise after wear.
[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A magnetic levitation frictionless angle holding mechanism for a leg rest, comprising a mounting arm (1), characterized in that: An adjustment mechanism (2) is provided on the left side of the mounting arm (1), and a fixing mechanism (3) is provided on the inner side of the adjustment mechanism (2). The adjustment mechanism (2) includes a support frame (21), which is fixedly connected to the left side of the mounting arm (1). A rotating shaft (22) is fixedly connected to the inner side of the support frame (21). A terminal sleeve (23) is fixedly connected to the front side of the rotating shaft (22). A stator core (24) is fixedly connected to the outer side of the rotating shaft (22). A voice coil winding (25) is fixedly connected to the outer side of the stator core (24). A bearing body (293) is fixedly connected to the outer side of the rotating shaft (22). A bearing seat (292) is fixedly connected to the outer side of the bearing body (293). A housing (27) is fixedly connected to the rear side of the bearing seat (292). An array of permanent magnet rings (26) is fixedly connected to the inner side of the housing (27). A connecting arm (28) is fixedly connected to the left side of the housing (27). A mounting base (29) is fixedly connected to the top of the connecting arm (28). A leg support body (291) is slidably connected to the top of the mounting base (29).
2. The magnetic levitation frictionless angle holding mechanism for a leg rest according to claim 1, characterized in that: The wiring sleeve (23) is fixedly connected to the inside of the support frame (21). The inside of the rotating shaft (22) is provided with a wiring groove, which is circular and hollow. The outer shell (27) is rotatably connected to the outside of the rotating shaft (22).
3. The magnetic levitation frictionless angle holding mechanism for a leg rest according to claim 1, characterized in that: The bearing housing (292) and bearing body (293) are provided in two sets and are symmetrically distributed on the front and rear sides of the outer shell (27).
4. The magnetic levitation frictionless angle holding mechanism for a leg rest according to claim 1, characterized in that: The array permanent magnet ring (26) is located outside the voice coil winding (25), and its inner side does not contact the outer side of the voice coil winding (25).
5. The magnetic levitation frictionless angle holding mechanism for a leg rest according to claim 1, characterized in that: The voice coil winding (25) is provided in three sets and is symmetrically distributed around the stator core (24).
6. The magnetic levitation frictionless angle holding mechanism for a leg rest according to claim 1, characterized in that: The fixing mechanism (3) includes a limiting frame (31), which is inserted into the mounting base (29) and the leg support body (291). A gasket (32) is slidably connected to the periphery of the limiting frame (31), and the gasket (32) is located on the rear side of the mounting base (29). A fixing sleeve (33) is threadedly connected to the rear periphery of the limiting frame (31).
7. A magnetic levitation frictionless angle holding mechanism for a leg rest according to claim 6, characterized in that: The front side of the gasket (32) is in contact with the rear side of the mounting base (29).