A self-powered wearable motion sensing device for facilitating collection of motion information

Abstract

This invention provides a self-generating wearable motion sensing device for easy acquisition of motion information, comprising two hinged torsion arms; a unidirectional turntable assembly with its rotation axis coaxial with the hinge axes of the two torsion arms, and multiple protrusions along the circumference of the unidirectional turntable assembly; multiple piezoelectric triggering units along the circumference of the turntable; a piezoelectric module including a piezoelectric cantilever, one end of which is fixed to one of the torsion arms, and the other end engaging with a piezoelectric triggering unit; and a triboelectric module connected to the other torsion arm, comprising two thin films arranged opposite each other, with protrusions engaging with the first thin film to move the two films closer together or further apart. This invention utilizes the piezoelectric module and piezoelectric triggering unit in cooperation, and the triboelectric module and protrusions in cooperation, allowing the leg to engage with both the piezoelectric triggering unit and the triboelectric module in the two phases of a walking cycle, thereby acquiring motion signals at different stages of the walking cycle and improving the accuracy of signal acquisition.

Description

Technical Field

[0001] This invention belongs to the field of wearable device technology, and in particular relates to a self-generating wearable motion sensing device that facilitates the collection of motion information. Background Technology

[0002] To improve the compatibility of wearable products with the human body and enhance user comfort, it is necessary to collect motion information from users during the initial design and experimental use of wearable products. Currently, most devices use triboelectric modules as motion sensors, converting the mechanical energy generated by changes in limb posture during joint movement into electrical signals. Changes in these electrical signals are then used to identify different postures during limb movement. However, during walking, the movement cycle of the human leg should be divided into a flexion phase and a kicking phase. The changes in electrical signals during these two phases share some similarities, such as the joint movement rate increasing from slow to fast. Existing sensors cannot accurately identify the electrical signals at each phase, or their internal structures are complex. Therefore, improving the accuracy of information collection is a pressing issue that needs to be addressed. Summary of the Invention

[0003] In view of this, the present invention aims to propose a self-generating wearable motion sensing device that facilitates the collection of motion information, so as to improve the accuracy of signal acquisition during limb movement.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A self-generating wearable motion sensing device for easy collection of motion information, comprising:

[0006] A first torsion arm and a second torsion arm, the first torsion arm and the second torsion arm being hinged together;

[0007] A one-way turntable assembly has a rotation axis coaxially arranged with the hinge axis of the first torsion arm and the second torsion arm, and multiple protrusions are provided along the circumference of the one-way turntable assembly. The turntable is provided with multiple piezoelectric triggering units along the circumference.

[0008] A piezoelectric module includes a piezoelectric cantilever, one end of which is fixed to a first torsion arm, and the other end of which is engaged with a piezoelectric triggering unit;

[0009] A triboelectric module is connected to a second torsion arm. The triboelectric module includes a first film and a second film, which are disposed opposite to each other. The protrusion can cooperate with the first film, so that the first film moves closer to or away from the second film.

[0010] Furthermore, the triboelectric module also includes a slider. The second torsion arm has a slide rail along its own length direction. The slider is placed in the slide rail and can reciprocate along the slide rail. Along the length direction of the slide rail, one end of the slider is provided with a ratchet, and the other end is fixed to the first film. The ratchet includes a hitting surface and an escape surface. The protrusion has a limiting surface and a guiding surface. The limiting surface is arranged radially along the one-way turntable assembly. The guiding surface extends obliquely into the turntable from the end of the limiting surface away from the axis of the one-way turntable assembly. The hitting surface is arranged opposite to the limiting surface, and the escape surface is arranged opposite to the guiding surface.

[0011] Furthermore, the triboelectric module also includes a tension spring, the slider extends outward in a direction perpendicular to the slide rail to form a first connecting part, the first torsion arm has a second connecting part at one end near the one-way turntable assembly, and the two ends of the tension spring are respectively connected to the first connecting part and the second connecting part.

[0012] Furthermore, the second torsion arm has a connecting beam, and there is a safety space between the line where the connecting beam is located and the line where the first torsion arm is located, and the triboelectric module is placed within the safety space.

[0013] Furthermore, the unidirectional turntable assembly includes a magnetic disc fixing wheel and a ratchet wheel, the protrusion is the ratchet tooth of the ratchet wheel, the piezoelectric triggering unit is the first magnetic disc, the piezoelectric cantilever end is provided with a magnetic conductor, and when the magnetic disc fixing wheel rotates, the magnetic conductor can be positioned opposite to the first magnetic disc, and the first magnetic disc is arranged at intervals along the circumference of the magnetic disc fixing wheel.

[0014] Furthermore, the magnetic disc fixing wheel and the ratchet wheel are connected by a transmission unit, which includes a driving gear, a driven gear, and at least one set of intermediate double teeth. The magnetic disc fixing wheel is coaxially connected to the driven gear, and the ratchet wheel is coaxially connected to the driving gear. The two gears of the intermediate double teeth mesh with the driving gear and the driven gear, respectively.

[0015] Furthermore, the first torsion arm end is provided with a mounting box, and the one-way turntable assembly also includes a one-way bearing. The ratchet wheel is connected to the inner ring of the one-way bearing, and the mounting box is connected to the outer ring of the one-way bearing.

[0016] Furthermore, the mounting box has a mounting slot on its side wall, and the end of the piezoelectric cantilever away from the piezoelectric triggering unit is fixedly connected to the mounting slot.

[0017] Furthermore, the intermediate double teeth are rotatably connected to the inner wall of the mounting box.

[0018] Furthermore, the magnetic disc fixing wheel is fixed with a plurality of second magnetic discs along its circumference, and the end of the first torsion arm is fixed with a plurality of coils, and the axis of the coils is parallel to the axis of the second magnetic discs, and the second magnetic discs can correspond to the coils during the rotation of the fixing wheel.

[0019] Compared with existing technologies, the self-generating wearable motion sensing device for facilitating the collection of motion information described in this invention has the following advantages:

[0020] This invention employs a piezoelectric module and a piezoelectric triggering unit in conjunction with a unidirectional turntable assembly, and a triboelectric module and a protrusion in conjunction with each other. This allows the leg to engage with the piezoelectric triggering unit and the triboelectric module during the flexion and kicking phases of a single walking cycle, thereby collecting motion signals at different stages of the walking cycle and improving the accuracy of signal acquisition.

[0021] By using the ratchet engagement between the protrusion and the slider, when the second torsion arm rotates around the first direction, the second torsion arm engages with the abutment surface and the limiting surface, causing the unidirectional turntable assembly to rotate synchronously with the second torsion arm, thus triggering the piezoelectric module; when the second torsion arm rotates around the second direction, the second torsion arm engages with the avoidance surface and the escape surface, thus triggering the triboelectric module. In this way, a single structure can engage with two modules in different working states, making the structure more compact, easier to wear and use, and reducing the impact of wearable devices on limb movements.

[0022] A connecting beam is installed on the second torsion arm, and a safety space is set between the connecting beam and the first torsion arm to avoid interference between the triboelectric module and the human body, which would affect the operation of the triboelectric module and the human body's limb movements.

[0023] By using a transmission unit to connect the magnetic disc fixing wheel and the ratchet wheel, the magnetic disc fixing unit can have a greater rotation speed and rotation angle. This allows the coil and the second magnetic disc to generate more electricity, while also increasing the coordination frequency between the piezoelectric module and the first magnetic disc, thereby improving the signal acquisition efficiency of the piezoelectric module. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of the motion sensing device;

[0026] Figure 2 This is a schematic diagram of the mating structure of the ratchet wheel and the triboelectric module;

[0027] Figure 3 A schematic diagram of the structure for the piezoelectric module and the magnetic disc fixing wheel;

[0028] Figure 4 This is a schematic diagram of the unidirectional turntable assembly.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-First torsion arm; 11-Mounting box; 2-Second torsion arm; 21-Connecting beam; 22-Guide slot; 23-Second connecting part; 24-Safety space; 3-Piezoelectric module; 31-Piezoelectric cantilever; 32-Magnetic conductor; 4-Triboelectric module; 41-First film; 42-Second film; 43-Slider; 431-Ratchet; 4311-Top surface; 4312-Escape surface; 432-First connecting part; 44-Tension spring; 5-One-way turntable assembly; 51-Ratchet wheel; 511-Protrusion; 5111-Limiting surface; 5112-Guide surface; 52-Magnetic disc fixing wheel; 521-First magnetic disc; 53-Transmission unit; 531-Driving gear; 532-Passive gear; 533-Intermediate double teeth; 6-Second magnetic disc; 7-Coil. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] The self-generating wearable motion sensing device for easy collection of motion information as described in this invention includes:

[0036] A first torsion arm 1 and a second torsion arm 2 are hinged together.

[0037] The unidirectional turntable assembly 5 has its rotation axis coaxially arranged with the hinge axis of the first torsion arm 1 and the second torsion arm 2. Multiple protrusions 511 are provided along the circumference of the unidirectional turntable assembly 5, and multiple piezoelectric triggering units are provided along the circumference of the turntable.

[0038] The piezoelectric module 3 includes a piezoelectric cantilever 31, one end of which is fixed to the first torsion arm 1 and the other end of which is engaged with the piezoelectric triggering unit.

[0039] The triboelectric module 4 is connected to the second torsion arm 2. The triboelectric module 4 includes a first film 41 and a second film 42. The first film 41 and the second film 42 are arranged opposite to each other, and the protrusion 511 can cooperate with the first film 41 so that the first film 41 moves closer to or further away from the second film 42.

[0040] Understandably, the first torsion arm 1 and the second torsion arm 2 can be hinged by a pivot. In this embodiment, the end edge of the first torsion arm 1 extends vertically to form multiple sidewalls, and these sidewalls, together with a top cover, form a mounting box 11. The second torsion arm 2 is rotatably connected to the top cover of the mounting box 11. The unidirectional turntable assembly 5 can rotate in one direction via a ratchet and pawl engagement or a unidirectional bearing. The first thin film 41 of the triboelectric module 4 can be a polytetrafluoroethylene film, and the second thin film 42 can be an aluminum film. Through the contact between the two films, electron transfer is generated, forming a voltage, which in turn forms a current through the connected wires, thereby collecting the electrical signal of the triboelectric module 4. The piezoelectric cantilever 31 can be made of a combination of a piezoelectric ceramic plate and a copper substrate. The piezoelectric trigger power source can be a protrusion or elastic element disposed on the unidirectional turntable assembly 5. Through the rotation of the unidirectional turntable assembly 5, the protrusion or elastic element contacts the piezoelectric cantilever 31, causing the piezoelectric cantilever 31 to deform, thereby generating electron transfer and forming a voltage. Then, through the connected wires, a current is formed, thereby collecting the electrical signal of the piezoelectric module 3.

[0041] The piezoelectric module 3 and the piezoelectric trigger unit of the one-way turntable assembly 5 are used in conjunction with the triboelectric module 4 and the protrusion 511, so that the leg cooperates with the piezoelectric trigger unit and the triboelectric module 4 respectively in the flexion and kicking phases included in one walking cycle, thereby collecting motion signals at different stages in the walking cycle and improving the accuracy of signal acquisition.

[0042] In this embodiment, the triboelectric module 4 further includes a slider 43. The second torsion arm 2 has a slide rail along its own length direction. The slider 43 is placed in the slide rail and can reciprocate along the slide rail. Along the length direction of the slide rail, one end of the slider 43 is provided with a ratchet 431, and the other end is fixedly connected to the first film 41. The ratchet 431 includes a hitting surface 4311 and an escape surface 4312. The protrusion 511 has a limiting surface 5111 and a guiding surface 5112. The limiting surface 5111 is arranged radially along the one-way turntable assembly 5. The guiding surface 5112 extends obliquely into the turntable from the end of the limiting surface 5111 away from the axis of the one-way turntable assembly 5. The hitting surface 4311 is arranged opposite to the limiting surface 5111, and the escape surface 4312 is arranged opposite to the guiding surface 5112. Alternatively, in other embodiments, a rotating rod may be provided, the middle part of which is hinged to the second torsion arm 2, one end of which engages with the protrusion 511, and the first membrane is connected to the other end of the rotating rod.

[0043] The triboelectric module 4 also includes a tension spring 44. The slider 43 extends outward from the slide rail with a first connecting portion 432. The first torsion arm 1 has a second connecting portion 23 at one end near the one-way turntable assembly 5. The two ends of the tension spring 44 are respectively hooked to the first connecting portion 432 and the second connecting portion 23. The second torsion arm 2 also has a guide slot 22 along its own length direction. The first connecting portion 432 and the second connecting portion 23 are columnar structures. The first connecting portion 432 passes through the guide slot 22 and passes through the slide rail to connect to the end of the tension spring 44. Optionally, the first connecting portion 432 and the second connecting portion 23 can also be a hanging ring or other structures.

[0044] The second torsion arm 2 has a connecting beam 21, and a safety space 24 exists between the straight line of the connecting beam 21 and the straight line of the first torsion arm 1. The triboelectric module 4 is placed within the safety space 24. This prevents the triboelectric module 4 from interfering with the human body and affecting its operation or human limb movements.

[0045] In this embodiment, the unidirectional turntable assembly 5 includes a magnetic disc fixing wheel 52 and a ratchet wheel 51. The protrusion 511 is the ratchet tooth 431 of the ratchet wheel 51. The piezoelectric triggering unit is a first magnetic disc 521. The end of the piezoelectric cantilever 31 is provided with a magnetic conductor 32. When the magnetic disc fixing wheel 52 rotates, the magnetic conductor 32 can be positioned opposite to the first magnetic disc 521. The first magnetic disc 521 is arranged at intervals along the circumference of the magnetic disc fixing wheel 52. It can be understood that the magnetic conductor 32 can be an iron sheet or a magnet, etc. When the magnetic disc fixing wheel 52 rotates, the spaced magnetic discs are sequentially positioned opposite to the iron sheet at the end of the piezoelectric cantilever 31, so that the iron sheet applies pressure to the ceramic piezoelectric cantilever 31 after being affected by changes in magnetic force, thereby generating an electrical signal.

[0046] The magnetic disc fixing wheel 52 and the ratchet wheel 51 are connected by a transmission unit 53. The transmission unit 53 includes a driving gear 531, a driven gear 532, and at least one set of intermediate double teeth 533. The magnetic disc fixing wheel 52 and the driven gear 532 are coaxially connected, and the ratchet wheel 51 and the driving gear 531 are coaxially connected. The two gears of the intermediate double teeth 533 mesh with the driving gear 531 and the driven gear 532, respectively. The number of teeth on the gear meshing with the driving gear 531 in the intermediate double teeth 533 is less than the number of teeth on the gear meshing with the driven gear 532. This increases the rotational speed of the magnetic disc fixing wheel 52, thereby increasing the frequency of engagement between the first magnetic disc 521 and the magnetic conductor 32. This results in more frequent voltage changes in the piezoelectric module 3 during limb movement, improving the accuracy of signal acquisition during limb movement. The intermediate double teeth 533 are rotatably connected to the inner wall on which they are installed.

[0047] In this embodiment, the one-way turntable assembly 5 further includes a one-way bearing. The ratchet wheel 51 is connected to the inner ring of the one-way bearing, and the mounting box 11 is connected to the outer ring of the one-way bearing. When the second torsion arm 2 rotates around the first direction, and the abutting surface 4311 of the ratchet 431 on the second torsion arm 2 abuts against the limiting surface 5111 of the ratchet wheel 51, the first torsion arm 1 can drive the ratchet wheel 51 to rotate around the first direction. When the second torsion arm 2 rotates around the second direction, and the escape surface 4312 of the ratchet 431 on the second torsion arm 2 engages with the guide surface 5112 of the protrusion 511, the inner and outer rings of the one-way bearing are locked in a relatively stationary state, thereby preventing the ratchet wheel 51 from rotating. This causes the slider 43 where the ratchet 431 is located to move along the slide after being engaged by the guide surface 5112 and the escape surface 4312, thereby triggering the triboelectric module 4. Those skilled in the art should know that the structure and working principle of the one-way bearing are existing technologies and will not be described in detail here.

[0048] The mounting box 11 has a mounting slot on its side wall, and the end of the piezoelectric cantilever 31 away from the piezoelectric triggering unit is fixedly connected to the mounting slot. Specifically, after the end of the piezoelectric cantilever 31 is inserted into the mounting slot, it can be fixed by screw connection or adhesive bonding, which also facilitates the connection of external wires to the piezoelectric cantilever 31.

[0049] The magnetic disc fixing wheel 52 is fixed with multiple second magnetic discs 6 along its circumference, and multiple coils 7 are fixed at the end of the first torsion arm 1. The axis of the coil 7 is parallel to the axis of the second magnetic disc 6, and the second magnetic disc 6 can correspond to the coil 7 during the rotation of the fixing wheel. Through the cooperation of the second magnetic disc 6 and the coil 7, the magnetic disc can move relative to the coil 7 during the rotation of the magnetic disc fixing wheel 52 to generate electricity, thereby converting the mechanical energy of the rotation of the first torsion arm 1 and the second torsion arm 2 into electrical energy to power the information acquisition equipment.

[0050] Those skilled in the art should know that how to collect the current and voltage changes of the piezoelectric module 3 and the triboelectric module 4 is existing technology, and will not be described in detail here.

[0051] The self-generating wearable motion sensing device of the present invention, which facilitates the collection of motion information, has the first torsion arm 1 and the second torsion arm 2 fixed to the thigh and calf of the human body respectively by means of straps or other structures, so that the mounting box 11 is located near the knee of the human body, and the rotation center of the knee is close to or even coincides with the rotation center of the one-way turntable assembly 5, thereby reducing the impact of the wearable device on the human limb movement. During the movement of the human leg, the first torsion arm 1 and the second torsion arm 2 are driven to rotate around the hinge.

[0052] Unlike traditional methods that rely solely on triboelectric or piezoelectric sensors for motion sensing, the collaborative operation of triboelectric module 4 and piezoelectric module 3 offers additional advantages in terms of system reliability. Because they employ different electrical components, triboelectric module 4 and piezoelectric module 3 exhibit varying sensitivities to environmental factors and wearing conditions. Even when one signal is affected by humidity changes or wearing deviations, the other signal can still provide effective motion information, resulting in a more robust overall sensing outcome. By integrating both triboelectric module 4 and piezoelectric module 3 into a unified structure driven by the same knee joint movement through the unidirectional turntable assembly 5, multi-dimensional, highly reliable, and self-powered acquisition of human motion information is achieved without increasing system load. Furthermore, the collaborative operation of triboelectric module 4 and piezoelectric module 3 enables parallel sensing of multiple physical quantities under the same human motion excitation. Triboelectric module 4, through the cooperation of the first and second thin films, undergoes displacement and contact separation processes with the periodic changes of the joint, more clearly reflecting the rhythmic characteristics and phase changes of motion; while piezoelectric module 3 more readily responds to impacts, vibrations, and strain rate changes generated during knee flexion, exhibiting higher resolution of motion intensity and dynamic differences in knee movement. Because they are based on different energy conversion mechanisms, their output signals are complementary in terms of information dimension. For motion states with similar cycles, such as brisk walking and jogging, a single type of sensing module often has difficulty in effectively distinguishing them. However, by collecting signals of different limb motion states by using two modules respectively, the differences in signals from different collection modules can be used to distinguish different limb motion states without the need for complex algorithms or external processing units, thereby improving the accuracy and stability of recognition.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-generating wearable motion sensing device for easy collection of motion information, characterized in that: include A first torsion arm and a second torsion arm, the first torsion arm and the second torsion arm being hinged together. A one-way turntable assembly has a rotation axis coaxially arranged with the hinge axis of the first torsion arm and the second torsion arm, and multiple protrusions are provided along the circumference of the one-way turntable assembly. The turntable is provided with multiple piezoelectric triggering units along the circumference. A piezoelectric module includes a piezoelectric cantilever, one end of which is fixed to a first torsion arm, and the other end of which is engaged with a piezoelectric triggering unit; A triboelectric module is connected to a second torsion arm. The triboelectric module includes a first film and a second film, which are disposed opposite to each other. The protrusion can cooperate with the first film, so that the first film moves closer to or away from the second film. The triboelectric module also includes a slider. The second torsion arm has a slide rail along its own length direction. The slider is placed in the slide rail and can reciprocate along the slide rail. Along the length direction of the slide rail, one end of the slider has a ratchet, and the other end is fixed to the first film. The ratchet includes a hitting surface and an escape surface. The protrusion has a limiting surface and a guide surface. The limiting surface is arranged radially along the one-way turntable assembly. The guide surface extends obliquely into the turntable from the end of the limiting surface away from the axis of the one-way turntable assembly. The hitting surface is arranged opposite to the limiting surface, and the escape surface is arranged opposite to the guide surface. The triboelectric module also includes a tension spring. The slider extends outward in a direction perpendicular to the slide rail to form a first connecting part. The first torsion arm has a second connecting part at one end near the one-way turntable assembly. The two ends of the tension spring are respectively connected to the first connecting part and the second connecting part. The piezoelectric triggering unit, which combines a piezoelectric module and a unidirectional turntable assembly, and the triboelectric module and the protrusion, work together so that the leg can cooperate with the piezoelectric triggering unit and the triboelectric module during the flexion and kicking phases of a walking cycle, respectively, to collect motion signals at different stages of the walking cycle.

2. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 1, wherein: The second torsion arm has a connecting beam, and there is a safety space between the line where the connecting beam is located and the line where the first torsion arm is located, and the triboelectric module is placed in the safety space.

3. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 1, wherein: The unidirectional turntable assembly includes a magnetic disc fixing wheel and a ratchet wheel. The protrusion is the ratchet tooth of the ratchet wheel. The piezoelectric triggering unit is a first magnetic disc. The piezoelectric cantilever end is provided with a magnetic conductor. When the magnetic disc fixing wheel rotates, the magnetic conductor can be positioned opposite to the first magnetic disc. The first magnetic disc is arranged at intervals along the circumference of the magnetic disc fixing wheel.

4. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 3, wherein: The magnetic disc fixing wheel and the ratchet wheel are connected by a transmission unit, which includes a driving gear, a driven gear, and at least one set of intermediate double teeth. The magnetic disc fixing wheel is coaxially connected to the driven gear, and the ratchet wheel is coaxially connected to the driving gear. The two gears of the intermediate double teeth mesh with the driving gear and the driven gear, respectively.

5. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 4, wherein: The first torsion arm end is provided with a mounting box, and the one-way turntable assembly also includes a one-way bearing. The ratchet wheel is connected to the inner ring of the one-way bearing, and the mounting box is connected to the outer ring of the one-way bearing.

6. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 5, wherein: The mounting box has a mounting slot on its side wall, and the end of the piezoelectric cantilever away from the piezoelectric triggering unit is fixedly connected to the mounting slot.

7. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 5, wherein: The middle double teeth are rotatably connected to the inner wall of the mounting box.

8. The self-powered wearable motion sensing device that facilitates the collection of motion information of claim 3, wherein: The magnetic disc fixing wheel is fixed with a plurality of second magnetic discs along its circumference, and the first torsion arm is fixed with a plurality of coils at its end, and the axis of the coils is parallel to the axis of the second magnetic discs, and the second magnetic discs can correspond to the coils during the rotation of the fixing wheel.

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