An electromagnetic wearable high-output energy harvester for leg joints

Abstract

The present invention relates to the field of portable power generation equipment, and particularly to an electromagnetic wearable high-output energy harvester for leg joints, which includes a driving mechanism, a variable-speed gear transmission mechanism, a housing assembly, and a three-phase brushless generator; the driving mechanism includes a driving arm; the housing assembly includes an outer shell, and the outer shell has a space for accommodating the variable-speed gear transmission mechanism and the three-phase brushless generator; the variable-speed gear transmission mechanism 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. By combining the planetary gear train and the belt drive, the present invention realizes the secondary acceleration of the transmission device, greatly improves the transmission ratio, ensures that the three-phase brushless motor can run at high speed and continuously, thereby enhancing the output power; improves the stability of the power generation device and ensures a low-noise state during operation, continuously powers portable electronic devices, and has wide application value.

Description

Technical Field

[0001] The present invention relates to the field of portable power generation equipment, and particularly 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. The traditional power supply method of portable electronic devices uses chemical batteries, which not only increases the volume and weight of portable electronic devices, but also has problems such as difficult recycling, environmental pollution, and limited service life, bringing many inconveniences and restrictions to users. The existing renewable energy harvesting such as wind energy, solar energy, and tidal energy needs to be carried out 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 the power supply problem of microelectronic devices.

[0003] Due to the limited collection range, the output power of joint power generation devices is low. At the same time, the entire device is configured at the joint part of the human body, which is extremely likely to affect the flexibility and comfort of the normal movement of the human body. Moreover, a large amount of noise will be generated during the operation of the energy harvester, and various parts are easily damaged by the impact of the force generated by human movement, and the stability is relatively low. Therefore, designing a human energy harvester that can generate electricity efficiently, has high flexibility and comfort, and high stability, and providing a continuous and stable power source for portable electronic devices has broad application prospects. Summary of the Invention

[0004] In order to solve the problems of low output power and affecting the normal movement of the human body existing 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 achieved through the following technical solutions: an electromagnetic wearable high-output energy harvester for leg joints, comprising a driving mechanism, a variable-speed gear transmission mechanism, a housing assembly, and a three-phase brushless generator;

[0006] The driving mechanism includes a driving arm, and a driving shaft hole is provided at the free end of the driving arm;

[0007] The housing assembly includes a housing, the housing has a space for accommodating the variable-speed gear transmission mechanism and the three-phase brushless generator, and a first mounting hole is provided on the housing;

[0008] The variable-speed gear transmission mechanism 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;

[0009] 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;

[0010] 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;

[0011] 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;

[0012] 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;

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] As a further improvement of the technical solution of the present invention, rolling bearings are respectively arranged at the rotational mating positions between the stepped planetary gears and the planetary shafts, between the support frames and the stepped portions of the shaft gears, and between the shaft gears and the limiting holes of the planetary carriers.

[0021] As a further improvement of the technical solution of the present invention, a flange bearing is arranged in a mating manner between the drive shaft of the planetary carrier and the first mounting hole of the housing.

[0022] An electromagnetic wearable high-output energy harvester for leg joints provided by the present invention has the following advantages compared with the prior art:

[0023] By combining the planetary gear train and the belt drive, the present invention realizes the secondary acceleration of the transmission device, greatly improves the transmission ratio, ensures that the three-phase brushless motor can run at a high speed for a long time, thereby enhancing the output power; the drive mechanism adopted improves the degree of freedom of the joint energy harvester and ensures the flexibility of normal human movement; the combination of the planetary gear train and the belt drive improves the stability of the power generation device and ensures a low-noise state during operation, continuously powers portable electronic devices, and has wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments in line with the present invention, and are used together with the specification to explain the principles of the present invention.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a split schematic diagram of an electromagnetic wearable high-output energy harvester for leg joints according to the present invention.

[0027] Figure 2 It is an installation schematic diagram of an electromagnetic wearable high-output energy harvester for leg joints according to the present invention.

[0028] Figure 3 It is a connection schematic diagram of the large belt pulley, the small belt pulley and the three-phase brushless generator.

[0029] Figure 4 It is a partial structure split schematic diagram of the variable-speed gear transmission mechanism.

[0030] Figure 5 It is a structural schematic diagram of the housing.

[0031] 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 - internal 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-shaped groove, 251 - second tooth-shaped 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-shaped shaft, 42 - support plate. Detailed implementation mode

[0032] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0034] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0035] The following details the specific embodiments of the present invention.

[0036] As Figures 1 to 5 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;

[0037] The driving mechanism includes a driving arm 103, and a driving shaft hole 104 is provided at the free end of the driving arm 103;

[0038] The housing assembly includes a housing 31, the housing 31 has a space for accommodating the variable-speed gear transmission mechanism and the three-phase brushless generator 4, and a first mounting hole 311 is provided on the housing 31;

[0039] 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;

[0040] 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;

[0041] 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;

[0042] 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;

[0043] 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;

[0044] 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 .

[0045] 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.

[0046] like Figure 1As shown in the figure, in this embodiment, the number of planetary shafts 211 on the planet carrier 21 is three, and they are equidistantly arranged on the planet carrier 21. The specific working principle of the energy harvester in this embodiment is as follows:

[0047] 1) Power generation stage: When 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 around the center of the driving shaft hole 104. Since the driving arm 103 is tightly fitted with the driving shaft 212 of the planet carrier 21, the planet carrier 21 is driven to rotate in the same direction as the driving arm 103. The stepped planetary gear 27 on the planet carrier 21 rotates together with the planet carrier 21. The first-stage gear 271 of the stepped planetary gear 27 meshes with the internal gear ring 23, and the internal gear ring 23 is in a stationary state. The second-stage gear 272 of the stepped planetary gear 27 meshes with the gear part 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 part 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, and the small pulley 25 further drives the three-phase brushless generator 4 to rotate to realize power generation.

[0048] 2) Reset stage: When 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 power generation stage direction) around the center of the driving shaft hole 104, the planet carrier 21 is driven to rotate in the opposite direction as the driving arm 103. The stepped planetary gear 27 on the planet carrier 21 rotates in the opposite direction together with the planet carrier 21. The first-stage gear 271 of the stepped planetary gear 27 meshes with the internal gear ring 23, and the internal gear ring 23 is in a stationary state. The second-stage gear 272 of the stepped planetary gear 27 meshes 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. The large pulley 24 does not rotate with the shaft gear 22, but continues to rotate in the original rotation direction (the power generation stage direction) 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.

[0049] In one example, the driving mechanism of this embodiment further includes a swing arm 101 and a connecting member 102. The two ends of the connecting member 102 are respectively hinged to the swing arm 101 and the driving arm 103 through hinge shaft elements, and the axes of the hinge 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 harvester 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 the relative angle through the hinge shaft elements following the movement direction of the human knee joint, improving the flexibility and comfort of normal human movement. For example Figure 1As shown, the swing arm 101 in this embodiment has a third mounting hole 105 for connecting and mating with the upper thigh armor.

[0050] In another example, the housing assembly further includes a support frame 32. The support frame 32 is fixedly arranged inside the outer shell 31. The other end of the shaft body of the shaft gear 22 has a stepped portion 223. The middle of the support frame 32 has a second mounting hole 322 that rotates and is in position-limiting fit with the stepped portion 223. In this embodiment, the support frame 32 can fix the relative position of the variable-speed gear rotating mechanism inside the outer shell 31, and the support frame 32 rotates in cooperation with the stepped portion 223 through the second mounting hole 322, which can avoid the rotational interference of the support frame 32 on the variable-speed gear rotating mechanism.

[0051] As Figure 1 shown, in order to facilitate the installation of the support frame 32 inside the outer shell 31, the support frame 32 has a plurality of mounting corners 321 for connecting and mating with the inner wall of the outer shell 31. Specifically, the mounting corners 321 are fixedly connected to the inner wall of the outer shell 31 through countersunk head bolts.

[0052] As Figure 2 and 3 shown, in order to facilitate the installation of the three-phase brushless generator 4 inside the outer shell 31, the housing of the three-phase brushless generator 4 has a support plate 42, and the support plate 42 is connected and arranged inside the outer shell 31. Specifically, the support plate 42 is fixedly connected to the inner wall of the outer shell 31 through countersunk head bolts.

[0053] As Figure 3 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, the center of the small pulley 25 is provided with a D-shaped hole, and the small pulley 25 is fixedly nested and connected to the D-shaped shaft 41 of the three-phase brushless generator 4 through the D-shaped hole.

[0054] The large pulley 24 and the small pulley 25 are driven by a timing belt 26, which reduces stress concentration and at the same time reduces the noise during the transmission process. At the same time, in order to improve the friction between the timing 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-shaped groove 241 and a second tooth-shaped groove 251 that are in frictional fit with the timing belt 26.

[0055] In order to reduce the friction coefficient between moving parts, rolling bearings are respectively arranged at the rotational mating positions of the stepped planetary gear 27 and the planetary shaft 211, the rotational mating position of the support frame 32 and the stepped portion 223 of the shaft gear 22, and the rotational mating position of the shaft gear 22 and the limiting hole 213 of the planet carrier 21.

[0056] Further, in order to reduce the friction coefficient between the drive shaft 212 of the planet carrier 21 and the housing 31, a flange bearing is disposed in a mating manner between the drive shaft 212 of the planet carrier 21 and the first mounting hole 311 of the housing 31.

[0057] The present invention adopts a variable-speed gear transmission mechanism to increase the transmission ratio and drive the three-phase brushless generator 4 to rotate at a high speed and continuously, thereby improving the output power. The swing arm 101 and the connecting member 102 are connected to the drive arm 103 to increase the degree of freedom of the joint energy harvester and ensure the flexibility of normal human movement. The combination of the planetary gear train and the belt drive is adopted to improve the stability of the power generation device and ensure a low-noise state during the working process, continuously supply power to the portable electronic device, and has the value of popularization.

[0058] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the foregoing 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); 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).

2. The electromagnetic wearable high-output energy harvester for leg joints according to claim 1, 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).

3. An electromagnetic wearable high-output energy harvester for leg joints according to claim 2, 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).

4. An electromagnetic wearable high-output energy harvester for leg joints according to claim 3, characterized in that, The housing of the three-phase brushless generator (4) is provided with a support plate (42), and the support plate (42) is connected and arranged inside the outer shell (31).

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

6. The electromagnetic wearable high-output energy harvester for leg joints according to claim 1, wherein First tooth-shaped grooves (241) and second tooth-shaped grooves (251) that are frictionally engaged with the synchronous belt (26) are respectively provided on the hubs of the large pulley (24) and the small pulley (25).

7. An electromagnetic wearable high-output energy harvester for leg joints according to claim 4, characterized in that Rolling bearings are respectively arranged at the rotational mating positions of the stepped planetary gear (27) and the planetary shaft (211), at the rotational mating position of the support frame (32) and the stepped portion (223) of the shaft gear (22), and at the rotational mating position of the shaft gear (22) and the limiting hole (213) of the planetary carrier (21).

8. An electromagnetic wearable high-output energy harvester for leg joints according to claim 4, characterized in that, A flange bearing is arranged in a mating manner between the drive shaft (212) of the planetary carrier (21) and the first mounting hole (311) of the outer shell (31).

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