Electromagnetic wearable high-output energy collector for leg joints

Abstract

The invention relates to the field of portable power generation equipment, in particular to an electromagnetic wearable high-output energy collector for a leg joint, which comprises a driving mechanism, a variable gear transmission mechanism, a shell assembly and a three-phase brushless generator, the driving mechanism comprises a driving arm; the shell assembly comprises a shell, and the shell is provided with a space for accommodating the change gear transmission mechanism and the three-phase brushless generator; the variable gear transmission mechanism comprises a planet carrier, a shaft gear, an inner gear ring, a large belt wheel, a small belt wheel, a synchronous belt, a one-way bearing and a plurality of stepped planet gears. By combining a planetary gear train with belt transmission, secondary acceleration of the transmission device is realized, the transmission ratio is greatly improved, and the three-phase brushless motor can run at a high speed for a long time, so that the output power is enhanced; the stability of the power generation device is improved, the low-noise state is kept in the working process, power is continuously supplied to portable electronic equipment, and the power generation device has wide application value.

Description

Technical Field

[0001] The present invention relates to the field of portable power generation equipment, and in particular to an electromagnetic wearable high-output energy harvester for leg joints. Background Art

[0002] With the development of the Internet of Things, portable electronic devices have become an indispensable part of people's lives. Traditional portable electronic devices are powered by chemical batteries, which not only increases the size and weight of portable electronic devices, but also has problems such as difficulty in recycling, environmental pollution, and limited service life, which brings many inconveniences and restrictions to users. The existing renewable energy sources such as wind energy, solar energy, and tidal energy can only be collected under specific conditions. Therefore, wearable power generation devices that collect the mechanical energy generated by human movement and convert it into electrical energy have become an ideal solution to solve the power supply problem of microelectronic devices.

[0003] The joint power generation device has a limited collection range, resulting in low output power. At the same time, the entire device is configured at the joints of the human body, which can easily affect the flexibility and comfort of normal human movement. In addition, the energy harvester will generate a lot of noise during operation, and the various parts are easily damaged by the impact of the force generated by human movement, and the stability is low. Therefore, a human energy harvester that can generate electricity efficiently, has high flexibility, comfort and stability is designed to provide a continuous and stable power supply for portable electronic devices, which has broad application prospects. Summary of the invention

[0004] In order to solve the problem of low output power and influence on normal movement of human body in current joint power generation devices, the present invention provides an electromagnetic wearable high-output energy harvester for leg joints.

[0005] The present invention is realized by the following technical solutions: an electromagnetic wearable high-output energy harvester for leg joints, comprising a driving mechanism, a speed-changing gear transmission mechanism, a housing assembly and a three-phase brushless generator; A driving mechanism, comprising a driving arm, wherein a driving shaft hole is provided on a free end of the driving arm; A housing assembly, comprising a housing having a space for accommodating a speed change gear transmission mechanism and a three-phase brushless generator, and having a first mounting hole on the housing; A speed change gear transmission mechanism, which includes a planet carrier, a shaft gear, an internal gear ring, a large pulley, a small pulley, a synchronous belt, a one-way bearing and a plurality of stepped planetary gears; A driving shaft is provided at the center point of one side of the planet carrier, and the driving shaft rotates through the first mounting hole and is tightly matched with the driving shaft hole. A plurality of planetary shafts are evenly arranged on the other side of the planet carrier with the center point as the center of the circle, and a limiting hole is provided at the center point of the other side of the planet carrier; A plurality of stepped planetary gears are rotatably disposed on corresponding planetary shafts, respectively, and the stepped planetary gears have a first-stage gear and a second-stage gear fixed to each other; One end of the shaft body of the shaft gear has a first shaft portion that is rotatably matched with the limiting hole, the middle part of the shaft body of the shaft gear has a gear portion that meshes with all the second-stage gears, and the shaft body of the shaft gear is provided with a second shaft portion that is tightly matched with the inner ring of the one-way bearing; The inner gear ring is fixedly arranged inside the housing, and all first-stage gears are meshed with the inner teeth of the inner gear ring; The outer ring of the one-way bearing is coaxially fixedly connected to the large pulley, the synchronous belt transmission is connected between the large pulley and the small pulley, and the small pulley is coaxially fixedly connected to the three-phase brushless generator.

[0006] As a further improvement of the technical solution of the present invention, the driving mechanism also includes a swing arm and a connecting member, the two ends of the connecting member are respectively hingedly connected to the swing arm and the driving arm through hinge shaft elements, and the axes of the hinge shaft elements at both ends of the connecting member are respectively perpendicular to the axis of the driving shaft hole.

[0007] As a further improvement of the technical solution of the present invention, the shell assembly also includes a support frame, which is fixedly arranged in the outer shell. The other end of the shaft body of the shaft gear has a step portion, and the middle part of the support frame has a second mounting hole that rotates and stops with the step portion.

[0008] As a further improvement of the technical solution of the present invention, the support frame has a plurality of installation angles connected and matched with the inner wall of the shell.

[0009] As a further improvement of the technical solution of the present invention, a support plate is provided on the casing of the three-phase brushless generator, and the support plate is connected and arranged in the outer casing.

[0010] As a further improvement of the technical solution of the present invention, a D-shaped hole is opened at the center of the small pulley, and the small pulley is fixedly nested and connected with the D-shaped shaft of the three-phase brushless generator through the D-shaped hole.

[0011] As a further improvement of the technical solution of the present invention, the hubs of the large pulley and the small pulley are respectively provided with a first toothed groove and a second toothed groove which are frictionally matched with the synchronous belt.

[0012] As a further improvement of the technical solution of the present invention, rolling bearings are respectively provided at the rotational fitting locations of the stepped planetary gear and the planetary shaft, the rotational fitting locations of the support frame and the stepped portion of the shaft gear, and the rotational fitting locations of the shaft gear and the limiting hole of the planetary frame.

[0013] As a further improvement of the technical solution of the present invention, a flange bearing is provided between the driving shaft of the planetary carrier and the first mounting hole of the housing.

[0014] The electromagnetic wearable high-output energy harvester for leg joints provided by the present invention has the following advantages compared with the prior art: The present invention realizes secondary acceleration of the transmission device by combining a planetary gear system with a belt drive, greatly improves the transmission ratio, ensures that the three-phase brushless motor can operate at high speed and for a long time, thereby enhancing the output power; the adopted driving mechanism improves the degree of freedom of the joint energy collector and ensures the flexibility of normal human movement; the combination of a planetary gear system and a belt drive is adopted to improve the stability of the power generation device and ensure that a low noise state is maintained during operation, thereby continuously supplying power to portable electronic devices, and has wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the disassembly of an electromagnetic wearable high-output energy harvester for leg joints described in the present invention.

[0018] Figure 2 This is a schematic diagram of the installation of an electromagnetic wearable high-output energy harvester for leg joints described in the present invention.

[0019] Figure 3 This is a connection diagram of the large pulley, the small pulley and the three-phase brushless generator.

[0020] Figure 4 It is a schematic diagram of the partial structure disassembly of the speed change gear transmission mechanism.

[0021] Figure 5 A schematic diagram of the structure of the shell.

[0022] In the figure: 101-swing arm, 102-connecting piece, 103-driving arm, 104-driving shaft hole, 105-third mounting hole; 21-planet carrier, 22-shaft gear, 23-inner gear ring, 24-large pulley, 25-small pulley, 26-synchronous belt, 27-stepped planetary gear, 28-one-way bearing, 211-planet shaft, 212-driving shaft, 213-limiting hole, 221-gear part, 222-second shaft part, 223-stepped part, 241-first tooth groove, 251-second tooth groove, 271-first stage gear, 272-second stage gear; 31-housing, 311-first mounting hole, 32-support frame, 321-mounting angle, 322-second mounting hole; 4-three-phase brushless generator, 41-D-type shaft, 42-support plate. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0024] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] The specific embodiments of the present invention are described in detail below.

[0027] like Figures 1 to 5 As shown, the present invention provides a specific embodiment of an electromagnetic wearable high-output energy harvester for leg joints, including a driving mechanism, a variable speed gear transmission mechanism, a housing assembly, and a three-phase brushless generator 4; The driving mechanism comprises a driving arm 103, wherein a driving shaft hole 104 is provided on a free end of the driving arm 103; The housing assembly comprises a housing 31, wherein the housing 31 has a space for accommodating a speed change gear transmission mechanism and a three-phase brushless generator 4, and the housing 31 has a first mounting hole 311; The speed change gear transmission mechanism includes a planet carrier 21, a shaft gear 22, an inner gear ring 23, a large pulley 24, a small pulley 25, a synchronous belt 26, a one-way bearing 28 and a plurality of stepped planetary gears 27; The center point of one side of the planet carrier 21 has a driving shaft 212, and the driving shaft 212 rotates through the first mounting hole 311 and is tightly matched with the driving shaft hole 104. The other side of the planet carrier 21 is evenly provided with a plurality of planetary shafts 211 with the center point as the center of the circle, and the center point of the other side of the planet carrier 21 has a limiting hole 213; A plurality of stepped planetary gears 27 are rotatably disposed on corresponding planetary shafts 211 , respectively, and the stepped planetary gears 27 have a first-stage gear 271 and a second-stage gear 272 fixed to each other; The shaft body of the shaft gear 22 has a first shaft portion rotatably matched with the limiting hole 213 at one end, a gear portion 221 meshing with all the second-stage gears 272 at the middle of the shaft body of the shaft gear 22, and a second shaft portion 222 tightly matched with the inner ring of the one-way bearing 28 at the shaft body of the shaft gear 22; The inner gear ring 23 is fixedly disposed inside the housing 31, and all first-stage gears 271 are meshed with the inner teeth of the inner gear ring 23; The outer ring of the one-way bearing 28 is coaxially fixedly connected to the large pulley 24 , the synchronous belt 26 is transmission-connected between the large pulley 24 and the small pulley 25 , and the small pulley 25 is coaxially fixedly connected to the three-phase brushless generator 4 .

[0028] When in use, the shell component part of the energy harvester described in this embodiment is fixed to the lower outer side of the human knee joint, the driving mechanism of the energy harvester is fixed to the upper outer side of the human knee joint, and the center of the driving shaft hole 104 is located on the center line of the bending direction or extension direction of the human knee joint. Specifically, the shell component and driving mechanism of the energy harvester in this embodiment can be fixed to the periphery of the human knee joint by means of strapping; or upper and lower leg armor can be respectively provided at the upper and lower positions of the human knee joint, and the shell component and driving mechanism of the energy harvester can be fixed to the periphery of the human knee joint by means of concealed buckles or bolts. It can be understood that the shell component of this embodiment also has an upper cover that cooperates with the outer shell 31. When in use, the upper cover cooperates with the outer shell 31 to accommodate the speed change gear transmission mechanism and the three-phase brushless generator 4 and fix them inside the shell component.

[0029] like Figure 1 As shown, in this embodiment, the number of planetary shafts 211 on the planetary frame 21 is three, and they are equidistantly arranged on the planetary frame 21. The specific working principle of the energy harvester of this embodiment is as follows: 1) Power generation stage: the thigh part of the human body moves, and the external force generated by the bending (or extension) of the human knee joint drives the driving arm 103 to rotate with the center of the driving shaft hole 104 as the center of the circle. Since the driving arm 103 is tightly matched with the driving shaft 212 of the planetary carrier 21, the planetary carrier 21 is driven to rotate in the same direction as the driving arm 103, and the stepped planetary gear 27 on the planetary carrier 21 rotates together with the planetary carrier 21. The first-stage gear 271 of the stepped planetary gear 27 is meshed with the inner gear ring 23, and the inner gear ring 23 is in a stationary state. The second-stage gear 272 of the stepped planetary gear 27 is meshed with the gear portion 221 of the shaft gear 22 and drives the shaft gear 22 to rotate. The one-way bearing 28 is in a locked state. The second shaft portion 222 of the shaft gear 22 drives the large pulley 24 to rotate through the one-way bearing 28. The large pulley 24 drives the small pulley 25 to rotate through the synchronous belt. The small pulley 25 further drives the three-phase brushless generator 4 to rotate to achieve power generation.

[0030] 2) Reset stage: The thigh part of the human body moves, and the external force generated by the extension (or bending) of the human knee joint drives the driving arm 103 to rotate in the opposite direction (opposite to the direction of the power generation stage) with the center of the driving shaft hole 104 as the center of the circle, and drives the planetary carrier 21 to rotate in the opposite direction with the driving arm 103. The stepped planetary gear 27 on the planetary carrier 21 rotates in the opposite direction with the planetary carrier 21. The first-stage gear 271 of the stepped planetary gear 27 is meshed with the inner gear ring 23, and the inner gear ring 23 is in a stationary state. The second-stage gear 272 of the stepped planetary gear 27 is meshed with the gear part 221 of the shaft gear 22 and drives the shaft gear 22 to rotate in the opposite direction. The one-way bearing 28 is in a disengaged state, and the large pulley 24 does not rotate with the shaft gear 22, but continues to rotate in the original rotation direction (the direction of the power generation stage) for a period of time under the action of inertia with the three-phase brushless generator 4 and the small pulley 25. When the driving arm 103 rotates to the initial position, a working cycle is completed.

[0031] In one example, the driving mechanism of this embodiment also includes a swing arm 101 and a connecting member 102, and the two ends of the connecting member 102 are respectively hingedly connected to the swing arm 101 and the driving arm 103 through hinged shaft elements, and the axes of the hinged shaft elements at both ends of the connecting member 102 are respectively perpendicular to the axis of the driving shaft hole 104. This driving mechanism can increase the degree of freedom of the joint energy collector and ensure the flexibility of normal human movement. Specifically, when the upper and lower parts of the human knee joint move relatively left and right, the swing arm 101 and the connecting member 102 can change their relative angles by following the movement direction of the human knee joint through the hinged shaft element, thereby improving the flexibility and comfort of normal human movement. Figure 1 As shown, the swing arm 101 in this embodiment has a third mounting hole 105 that is connected and cooperates with the upper leg armor.

[0032] In another example, the housing assembly further includes a support frame 32, the support frame 32 is fixedly disposed in the housing 31, the other end of the shaft body of the shaft gear 22 has a stepped portion 223, and the middle portion of the support frame 32 has a second mounting hole 322 that rotates and stops with the stepped portion 223. In this embodiment, the support frame 32 is used to fix the relative position of the speed change gear rotating mechanism in the housing 31, and the support frame 32 is rotatably matched with the stepped portion 223 through the second mounting hole 322, which can avoid the support frame 32 from interfering with the rotation of the speed change gear rotating mechanism.

[0033] like Figure 1 As shown, in order to facilitate the installation of the support frame 32 inside the housing 31, the support frame 32 has a plurality of installation angles 321 connected and matched with the inner wall of the housing 31. Specifically, the installation angles 321 are fixedly connected to the inner wall of the housing 31 by countersunk bolts.

[0034] like Figure 2 and 3 As shown, in order to facilitate the installation of the three-phase brushless generator 4 inside the housing 31, the housing of the three-phase brushless generator 4 has a support plate 42, and the support plate 42 is connected and arranged in the housing 31. Specifically, the support plate 42 is fixedly connected to the inner wall of the housing 31 by countersunk bolts.

[0035] like Figure 3 As shown, in order to facilitate the small pulley 25 to drive the three-phase brushless generator 4 to rotate, this embodiment provides a connection method between the small pulley 25 and the three-phase brushless generator 4, that is, a D-shaped hole is opened at the center of the small pulley 25, and the small pulley 25 is fixedly nested and connected with the D-shaped shaft 41 of the three-phase brushless generator 4 through the D-shaped hole.

[0036] The large pulley 24 and the small pulley 25 are driven by a synchronous belt 26, which reduces stress concentration and noise during transmission. At the same time, in order to increase the friction between the synchronous belt 26 and the large pulley 24 and the small pulley 25, the hubs of the large pulley 24 and the small pulley 25 are respectively provided with a first tooth groove 241 and a second tooth groove 251 that frictionally cooperate with the synchronous belt 26.

[0037] In order to reduce the friction coefficient between moving parts, in this embodiment, rolling bearings are respectively provided at the rotational fitting points between the stepped planetary gear 27 and the planetary shaft 211, the rotational fitting points between the support frame 32 and the stepped portion 223 of the shaft gear 22, and the rotational fitting points between the shaft gear 22 and the limiting hole 213 of the planetary frame 21.

[0038] Furthermore, in order to reduce the friction coefficient between the driving shaft 212 of the planet carrier 21 and the housing 31 , a flange bearing is provided between the driving shaft 212 of the planet carrier 21 and the first mounting hole 311 of the housing 31 .

[0039] The present invention adopts a variable speed gear transmission mechanism to increase the transmission ratio, drive the three-phase brushless generator 4 to rotate at a high speed and for a long time, and improve the output power; adopts a swing arm 101 and a connecting piece 102 to connect with a driving arm 103, increases the degree of freedom of the joint energy collector, and ensures the flexibility of normal human movement; adopts a planetary gear system and a belt drive combination to improve the stability of the power generation device and ensure that a low noise state is maintained during the working process, and continuously supplies power to portable electronic devices, which has promotion value.

[0040] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. An electromagnetic wearable high-output energy harvester for leg joints, characterized in that: It includes a driving mechanism, a speed change gear transmission mechanism, a housing assembly and a three-phase brushless generator (4); A driving mechanism, comprising a driving arm (103), wherein a driving shaft hole (104) is provided on a free end of the driving arm (103); A housing assembly, comprising a housing (31), the housing (31) having a space for accommodating a speed change gear transmission mechanism and a three-phase brushless generator (4), and the housing (31) having a first mounting hole (311); A speed change gear transmission mechanism, comprising a planet carrier (21), a shaft gear (22), an internal gear ring (23), a large pulley (24), a small pulley (25), a synchronous belt (26), a one-way bearing (28), and a plurality of stepped planetary gears (27); A driving shaft (212) is provided at the center point of one side of the planet carrier (21), the driving shaft (212) rotates through the first mounting hole (311) and is tightly matched with the driving shaft hole (104), a plurality of planetary shafts (211) are evenly arranged on the other side of the planet carrier (21) with the center point as the center of the circle, and a limiting hole (213) is provided at the center point of the other side of the planet carrier (21); A plurality of stepped planetary gears (27) are rotatably disposed on corresponding planetary shafts (211), respectively, and the stepped planetary gears (27) have a first-stage gear (271) and a second-stage gear (272) fixed to each other; One end of the shaft body of the shaft gear (22) has a first shaft portion rotatably matched with the limiting hole (213), the middle part of the shaft body of the shaft gear (22) has a gear portion (221) meshingly matched with all the second-stage gears (272), and the shaft body of the shaft gear (22) is provided with a second shaft portion (222) tightly matched with the inner ring of the one-way bearing (28); The inner gear ring (23) is fixedly arranged inside the outer shell (31), and all first-stage gears (271) are meshed with the inner teeth of the inner gear ring (23); The outer ring of the one-way bearing (28) is coaxially fixedly connected to the large pulley (24), the synchronous belt (26) is transmission-connected between the large pulley (24) and the small pulley (25), and the small pulley (25) is coaxially fixedly connected to the three-phase brushless generator (4).

2. The electromagnetic wearable high-output energy harvester for leg joints according to claim 1, characterized in that: The driving mechanism further comprises a swing arm (101) and a connecting member (102), wherein two ends of the connecting member (102) are respectively hingedly connected to the swing arm (101) and the driving arm (103) via hinged axis elements, and the axes of the hinged axis elements at both ends of the connecting member (102) are respectively perpendicular to the axis of the driving axis hole (104).

3. The electromagnetic wearable high-output energy harvester for leg joints according to claim 2, characterized in that: The housing assembly further comprises a support frame (32), wherein the support frame (32) is fixedly arranged in the housing (31), the other end of the shaft body of the shaft gear (22) comprises a stepped portion (223), and the middle portion of the support frame (32) comprises a second mounting hole (322) which is rotatably and stop-fitted with the stepped portion (223).

4. The electromagnetic wearable high-output energy harvester for leg joints according to claim 3, characterized in that: The support frame (32) has a plurality of installation angles (321) that are connected and matched with the inner wall of the outer shell (31).

5. The electromagnetic wearable high-output energy harvester for leg joints according to claim 4, characterized in that: The casing of the three-phase brushless generator (4) is provided with a support plate (42), and the support plate (42) is connected and arranged in the outer casing (31).

6. The electromagnetic wearable high-output energy harvester for leg joints according to claim 5, characterized in that: A D-shaped hole is provided at the center of the small belt pulley (25), and the small belt pulley (25) is fixedly nested and connected with the D-shaped shaft (41) of the three-phase brushless generator (4) through the D-shaped hole.

7. The electromagnetic wearable high-output energy harvester for leg joints according to claim 1, characterized in that: The hubs of the large pulley (24) and the small pulley (25) are respectively provided with a first toothed groove (241) and a second toothed groove (251) which are frictionally matched with the synchronous belt (26).

8. The electromagnetic wearable high-output energy harvester for leg joints according to claim 5, characterized in that: Rolling bearings are respectively provided at the rotational matching position between the stepped planetary gear (27) and the planetary shaft (211), the rotational matching position between the support frame (32) and the stepped portion (223) of the shaft gear (22), and the rotational matching position between the shaft gear (22) and the limiting hole (213) of the planetary frame (21).

9. The electromagnetic wearable high-output energy harvester for leg joints according to claim 5, characterized in that: A flange bearing is provided between the driving shaft (212) of the planet carrier (21) and the first mounting hole (311) of the housing (31).

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