Energy conversion and recovery device of electric moped

Abstract

The utility model belongs to the field of electric mopeds, and discloses an electric moped energy conversion and recovery device which comprises a hub, and a permanent magnet, a planetary gear assembly and a coil assembly are arranged in the hub. The permanent magnets comprise N-pole magnets and S-pole magnets, and the permanent magnets form a space magnetic field with magnetic induction lines distributed in the axial direction in the hub; the planetary gear assembly comprises a gear shaft, a fixed gear ring, a planetary gear and a planetary gear support, the two ends of the gear shaft are connected with inner rings of the permanent magnets through bearings respectively, the fixed gear ring is fixedly connected with the hub shell, the planetary gear is installed on the planetary gear support, and the planetary gear support is fixedly connected with one of the permanent magnets closer in position; the coil assembly is fixedly arranged on the gear shaft in a sleeving mode, the coil assembly cuts magnetic induction lines after rotating along with the gear shaft, induction current is generated, and the generated induction current is output through the cable. The problems that an existing power generation hub is low in energy conversion efficiency, and less convertible energy is obtained by the internal structure of the hub are solved.

Description

Technical Field

[0001] The utility model belongs to the field of electric power-assisted vehicles, and in particular relates to an energy conversion and recovery device for electric power-assisted vehicles. Background Art

[0002] As a product between bicycles and electric bicycles, electric-assisted bicycles are equipped with a power system centered on sensors and motors. They have the lightness and portability of traditional bicycles while also having the power advantages of electric bicycles.

[0003] Although an electric-assisted bicycle can still be ridden as a normal bicycle after the battery is exhausted, the power system of the entire vehicle will greatly increase the riding resistance without power. Therefore, how to increase the cruising range of electric-assisted bicycles has become a problem that needs to be solved urgently.

[0004] At present, the electric assisted bicycles on the market mainly achieve energy conversion through the power hub. When the electric assisted bicycle brakes and slows down, the rotor inside the hub rotates under the action of inertia, thereby converting potential energy into electrical energy, and then outputting and storing the electrical energy, thereby improving the endurance.

[0005] However, the existing solutions have low energy conversion efficiency, low power generation, and limited amount of electricity that can be stored and reused. The reasons are as follows: 1) Most solutions convert the potential energy generated during riding into electrical energy, but potential energy is only a very small part of the energy generated during riding, and more is the kinetic energy generated by the wheels when the acceleration changes little. Therefore, less energy can be converted in the initial stage. 2) The internal structure of the hub is simple, and as a general generator, its energy conversion efficiency is not high. Utility Model Content

[0006] The utility model aims to provide an energy conversion and recovery device for an electric assisted bicycle, so as to solve the problems of low energy conversion efficiency of the existing power generating hub and little convertible energy obtained by the internal structure of the hub.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] An energy conversion and recovery device for an electric power-assisted bicycle comprises a hub for modular replacement, wherein the hub is fixedly connected to a front fork or a rear cross fork of an electric power-assisted bicycle frame via shafts extending from both ends, and a permanent magnet, a planetary gear assembly and a coil assembly are arranged inside the hub;

[0009] The permanent magnet includes an N-pole magnet and an S-pole magnet, and the N-pole magnet and the S-pole magnet are respectively fixedly connected to the shafts at both ends of the hub, and the permanent magnet forms a spatial magnetic field inside the hub with magnetic flux lines distributed along the axial direction;

[0010] The planetary gear assembly includes a gear shaft, a fixed gear ring, a planetary gear and a planetary gear bracket, the two ends of the gear shaft are respectively connected to the inner rings of the N-pole magnet and the S-pole magnet through bearings, the fixed gear ring is fixedly connected to the shell of the hub, the planetary gear is installed on the planetary gear bracket, the outer side of the planetary gear is meshed with the fixed gear ring, and the inner side is meshed with the gear shaft, and the planetary gear bracket is fixedly connected to one of the permanent magnets that is closer in position;

[0011] The coil assembly is fixedly sleeved on the gear shaft. The coil assembly follows the rotation of the gear shaft to cut the magnetic flux lines, generate induced current, and output the generated induced current through a cable.

[0012] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0013] Preferably, the shell of the hub includes an end cover and a cavity, the cavity is a hollow cylinder with one end open, and the end cover cooperates with the opening of the cylinder, and spoke holes are arranged on the circumference of the cavity and fixedly connected to the wheel of the electric power-assisted bicycle based on the spoke holes;

[0014] The permanent magnet, the planetary gear assembly and the coil assembly are arranged inside the cavity, and the shafts extending from both ends are respectively connected to the end cover and the end surface of one side of the cavity that is not opened through bearings.

[0015] Preferably, the fixed gear ring is fixedly connected to the shell of the hub by a plurality of screws evenly distributed radially.

[0016] Preferably, the planetary gear is connected to the planetary gear support via a bearing.

[0017] Preferably, at least three planetary gears are provided, and at least three planetary gears are evenly distributed on the circumference of the gear shaft.

[0018] Preferably, the planetary gear bracket is fixed to one of the shafts extending from both ends that is closer to the other and one of the permanent magnets that is closer to the other by a plurality of long screws.

[0019] Preferably, the coil assembly includes a coil and a coil bracket, the coil bracket is fixedly connected to the gear shaft via a flat key, the coil bracket is a plate-like structure, and one end face of the plate-like structure is provided with an equal number of multiple outer circular bosses and multiple inner circular bosses, the multiple outer circular bosses are distributed in a circular ring shape on the periphery of the plate-like structure, the multiple inner circular bosses are distributed in a circular ring shape on the inner periphery of the plate-like structure, and the outer circular bosses and the inner circular bosses are staggered, and the coil is radially wound through the outer circular bosses and the inner circular bosses.

[0020] Preferably, the diameter of the outer circular boss is larger than that of the inner circular boss.

[0021] Preferably, the coil is wound radially with one or more turns.

[0022] Preferably, one of the shafts extending from both ends that is close to the coil assembly is a hollow shaft, the interior of the hollow shaft is used to avoid the cable, one end of the cable is connected to the coil through a conductive slip ring, and the other end of the cable passes through the interior of the hollow shaft to pass through the hub and is connected to an external power storage device or power-consuming device.

[0023] The utility model provides an energy conversion and recovery device for an electric assisted bicycle, which has the following beneficial effects compared with the existing devices:

[0024] 1. The utility model can realize the modification of bicycle wheels. The wheel hub can be replaced to realize riding and power generation, thus meeting the modification needs of cyclists.

[0025] 2. The utility model is different from similar existing products in that most existing hub power generation devices use the acceleration or kinetic potential energy generated during riding to convert it into electrical energy for storage. This part of energy is generated for a short time during riding, and the energy that can be converted is limited. However, the power generation hub of the utility model can convert energy as long as the wheel rotates, thereby improving the utilization rate of energy.

[0026] 3. The utility model transmits power through a planetary gear set. The fixed gear ring is connected to the hub shell and rotates at a low speed with the wheel. The surrounding planetary gears rotate fixedly, so that the central gear shaft rotates at a high speed and drives the coaxial coil assembly to rotate at a high speed, thereby quickly cutting the magnetic flux lines to improve the power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an exploded view of an energy conversion and recovery device for an electric assisted bicycle of the utility model;

[0028] Figure 2 This is a cross-sectional view of an energy conversion and recovery device for an electric assisted bicycle according to the utility model;

[0029] Figure 3It is a structural schematic diagram of the coil assembly of the utility model.

[0030] In the diagram: 1. end cover; 2. cavity; 3. outlet shaft; 4. fixed shaft; 5. N-pole magnet; 6. S-pole magnet; 7. coil; 8. coil bracket; 9. gear shaft; 10. fixed gear ring; 11. planetary gear; 12. planetary gear bracket; 13. screw; 14. long screw. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that when a component is referred to as being “connected” to another component, it may be directly connected to the other component or there may be a central component; when a component is referred to as being “fixed” to another component, it may be directly fixed to the other component or there may be a central component.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides an energy conversion and recovery device for an electric assisted bicycle, which mainly includes a hub for modular replacement. The hub as a whole is a module of the electric assisted bicycle, and the hub of the front wheel or rear wheel of the electric assisted bicycle can be replaced to meet the modification needs of the rider and relieve the anxiety of electricity consumption.

[0035] The hub includes a shell, a permanent magnet, a planetary gear assembly, a coil assembly, and shafts extending from both ends.

[0036] The shell of the hub includes an end cover 1 and a cavity 2. The cavity 2 is a hollow cylinder with one end open, and the end cover 1 matches the opening of the cylinder. Spoke holes are arranged on the circumference of the cavity 2 and are fixedly connected to the wheel of the electric assisted bicycle based on the spoke holes. The permanent magnet, the planetary gear assembly and the coil assembly are arranged inside the cavity 2. The shafts extending from both ends are respectively connected to the end cover 1 and the unopened end face of the cavity 2 through bearings. For the convenience of description, in this embodiment, the shaft connected to the end cover 1 is called the outlet shaft 3, and the other shaft is called the fixed shaft 4.

[0037] The end cap 1 and the cavity 2 of the hub are fixed by screws, and the spoke holes arranged on the cavity 2 of the hub are arranged according to the wheel standard of the electric power-assisted bicycle, so as to be used for weaving the wheel. The spokes connected to the spoke holes are fixedly connected to the wheel, and the outlet shaft 3 and the fixed shaft 4 are fixedly connected to the front fork or the rear cross fork of the frame.

[0038] In this embodiment, since both the outlet shaft 3 and the fixed shaft 4 need to be fixedly connected to other components, in order to facilitate connection, the outlet shaft 3 and the fixed shaft 4 each include a connecting shaft and a disc extending perpendicular to the axial direction, wherein the connecting shaft is connected to the shell of the hub through a bearing, and the disc is used to connect to the internal components of the hub.

[0039] The permanent magnet includes an N-pole magnet 5 and an S-pole magnet 6, and the N-pole magnet 5 and the S-pole magnet 6 are respectively fixedly connected to the shafts at both ends of the hub. In this embodiment, the N-pole magnet 5 is close to the outlet shaft 3 and the S-pole magnet 6 is close to the fixed shaft 4. It is easy to understand that in other embodiments, the positions of the N-pole magnet 5 and the S-pole magnet 6 can be exchanged.

[0040] Specifically, in this embodiment, the circular surface of the cylindrical N-pole magnet 5 is in contact with the circular disk of the outlet shaft 3, and the two are fixedly connected by screws, and the circular surface of the cylindrical S-pole magnet 6 is in contact with the circular disk of the fixed shaft 4, and the two are fixedly connected by screws. Therefore, the permanent magnet forms a spatial magnetic field inside the hub with magnetic flux lines distributed along the axial direction.

[0041] The planetary gear assembly includes a gear shaft 9, a fixed gear ring 10, a planetary gear 11 and a planetary gear bracket 12. The two ends of the gear shaft 9 are connected to the inner rings of the N-pole magnet 5 and the S-pole magnet 6 respectively through bearings. The fixed gear ring 10 is fixedly connected to the shell of the hub. In order to facilitate the reasonable use of the space inside the hub, the fixed gear ring 10 is installed in the hub near the center along the axial direction in this embodiment, and the remaining components (except the planetary gear) are basically symmetrically designed along the fixed gear ring, that is, the overall design of the hub in this embodiment is basically symmetrical to ensure that the center of the rider is not offset. In addition, the fixed gear ring 10 is fixedly connected to the cavity 2 in the shell of the hub by a plurality of (for example, 6, 8, etc.) screws 13 evenly distributed in the radial direction.

[0042] The planetary gear 11 is mounted on the planetary gear bracket 12 through a bearing, and in order to obtain a stable rotational force transmission, in this embodiment, at least three (for example, three, four, etc.) planetary gears 11 are provided, and at least three planetary gears 11 are evenly distributed around the gear shaft 9. The outer side of the planetary gear 11 is meshed with the inner surface gear of the fixed gear ring 10, and the inner side of the planetary gear 11 is meshed with the outer surface gear of the gear shaft 9. Therefore, when the hub rotates, the fixed gear ring 10 is driven to rotate at a low speed, and the rotation is amplified at the gear shaft 9 to form a high-speed rotation after being transmitted by the three planetary gears 11. In addition, in this embodiment, the planetary gear 11 is preferably made of nylon to reduce the overall mass of the device and reduce the resistance during riding.

[0043] The planetary gear bracket 12 is fixedly connected to one of the permanent magnets that is closer in position. In order to improve the fixing effect, the planetary gear bracket 12 is fixed to one of the shafts extending from both ends that is closer in position (the fixed shaft 4 in this embodiment) and one of the permanent magnets that is closer in position (the S pole magnet 6 in this embodiment) by multiple (for example, 3, 4, etc.) long screws 14, wherein the long screws 14 are preferably evenly distributed around the gear shaft 9.

[0044] The coil assembly is fixedly sleeved on the gear shaft 9. The coil assembly follows the gear shaft 9 to rotate and cuts the magnetic flux lines, generates an induced current, and outputs the generated induced current through a cable (not shown in the figure). Since the magnetic field direction formed by the permanent magnet in this embodiment is an axial space magnetic field, the traditional circularly wound coil cannot cut the magnetic flux lines and generate an induced current during the rotation process. Only radially wound coils can generate induced current when rotating, so the radially wound coil is used in this embodiment.

[0045] like Figure 3 As shown, a radially wound coil is provided in this embodiment. It should be noted that the three-dimensional model of the coil assembly in the figure is only for illustrating the winding method. In actual production, the winding density of the coil can be increased as long as the wire coil is radially wound to the greatest extent.

[0046] The coil assembly includes a coil 7 and a coil support 8, and the coil support 8 is fixedly connected to the gear shaft 9 through a flat key and rotates at high speed with the gear shaft 9. The coil support 8 is a plate-like structure, and one end surface of the plate-like structure is provided with an equal number of outer circular bosses and multiple inner circular bosses (for example, 10, 12, etc., theoretically, the more the number, the more the coil tends to be wound radially, but factors such as winding space should also be considered at the same time), the multiple outer circular bosses are distributed in a circular ring shape on the periphery of the plate-like structure, and the multiple inner circular bosses are distributed in a circular ring shape on the inner periphery of the plate-like structure, and the two are distributed concentrically, and the outer circular bosses and the inner circular bosses are staggered, and the coil 7 is wound radially through the outer circular bosses and the inner circular bosses.

[0047] Due to the annular distribution, the circumference of the outer circle must be greater than the circumference of the inner circle. Therefore, in this embodiment, the diameter of the outer circular boss is larger than that of the inner circular boss, so that the coil 7 can be wound one or more circles in the radial direction.

[0048] In order to extract the induced current generated by the coil assembly, in this embodiment, one of the shafts extending from both ends and close to the coil assembly (the wire output shaft 3 in this embodiment) is set as a hollow shaft, and the interior of the hollow shaft is used to avoid the cable. One end of the cable is connected to the coil 7 through a conductive slip ring, and the other end of the cable passes through the hub through the interior of the hollow shaft and is connected to an external power storage device or power-consuming device.

[0049] It is easy to understand that in addition to the above-mentioned main components, in order to improve the overall performance of the device, some conventional small components, such as retaining springs, can also be introduced to prevent the components connected to the shaft from moving axially. For example, retaining springs are used between the N-pole magnet 5 and the coil bracket 8, and between the coil bracket 8 and the fixed gear ring 10 to prevent the components from moving axially.

[0050] The utility model discloses an energy conversion and recovery device for an electric assisted bicycle. When the user is riding, the hub rotates with the wheel and drives the fixed gear ring 10 to rotate together. The outlet shaft 3 and the fixed shaft 4 are both fixed to the frame, so they do not rotate with the wheel, and are fixed together with the N-pole magnet 5, S-pole magnet 6 and the planetary gear bracket 12 inside the hub. The fixed gear ring 10 rotates at a low speed, and the rotation speed is amplified to the gear shaft 9 through the planetary gear 11. The high-speed rotating gear shaft 9 drives the coil 7 and the coil bracket 8 to rotate together. The radially wound coil 7 cuts the magnetic flux lines at a high speed in the axial magnetic field formed by the N-pole magnet 5 and the S-pole magnet 6, generates an induced current, and outputs it through the cable to achieve energy conversion and recovery.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. An energy conversion and recovery device for an electric power-assisted bicycle, comprising a hub for modular replacement, wherein the hub is fixedly connected to a front fork or a rear cross fork of an electric power-assisted bicycle frame through shafts extending from both ends, characterized in that: The hub is provided with a permanent magnet, a planetary gear assembly and a coil assembly inside; The permanent magnet includes an N-pole magnet and an S-pole magnet, and the N-pole magnet and the S-pole magnet are respectively fixedly connected to the shafts at both ends of the hub, and the permanent magnet forms a spatial magnetic field inside the hub with magnetic flux lines distributed along the axial direction; The planetary gear assembly includes a gear shaft, a fixed gear ring, a planetary gear and a planetary gear bracket, the two ends of the gear shaft are respectively connected to the inner rings of the N-pole magnet and the S-pole magnet through bearings, the fixed gear ring is fixedly connected to the shell of the hub, the planetary gear is installed on the planetary gear bracket, the outer side of the planetary gear is meshed with the fixed gear ring, and the inner side is meshed with the gear shaft, and the planetary gear bracket is fixedly connected to one of the permanent magnets that is closer in position; The coil assembly is fixedly sleeved on the gear shaft. The coil assembly follows the rotation of the gear shaft to cut the magnetic flux lines, generate induced current, and output the generated induced current through a cable.

2. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 1, characterized in that: The shell of the hub includes an end cover and a cavity, wherein the cavity is a hollow cylinder with one end open, and the end cover cooperates with the opening of the cylinder, and spoke holes are arranged on the circumference of the cavity and fixedly connected to the wheel of the electric power-assisted bicycle based on the spoke holes; The permanent magnet, the planetary gear assembly and the coil assembly are arranged inside the cavity, and the shafts extending from both ends are respectively connected to the end cover and the end surface of one side of the cavity that is not opened through bearings.

3. The energy conversion and recovery device for an electric power-assisted vehicle according to claim 1, characterized in that: The fixed gear ring is fixedly connected to the shell of the hub through a plurality of screws evenly distributed in the radial direction.

4. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 1, characterized in that: The planetary gear is connected to the planetary gear support through a bearing.

5. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 1, characterized in that: There are at least three planetary gears, and the at least three planetary gears are evenly distributed on the circumference of the gear shaft.

6. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 1, characterized in that: The planetary gear support is fixed to one of the shafts extending from both ends and one of the permanent magnets, whichever is closer, by a plurality of long screws.

7. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 1, characterized in that: The coil assembly includes a coil and a coil bracket, the coil bracket is fixedly connected to the gear shaft through a flat key, the coil bracket is a plate-like structure, and one end face of the plate-like structure is provided with a plurality of outer circular bosses and a plurality of inner circular bosses of equal number, the plurality of outer circular bosses are distributed in a circular ring shape on the periphery of the plate-like structure, the plurality of inner circular bosses are distributed in a circular ring shape on the inner periphery of the plate-like structure, and the outer circular bosses and the inner circular bosses are staggered, and the coil is radially wound through the outer circular bosses and the inner circular bosses.

8. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 7, characterized in that: The diameter of the outer circular boss is larger than that of the inner circular boss.

9. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 7, characterized in that: The coil is wound with one or more turns in the radial direction.

10. The energy conversion and recovery device for an electric power-assisted bicycle according to claim 7, characterized in that: Among the shafts extending from both ends, one shaft close to the coil assembly is a hollow shaft, the interior of the hollow shaft is used to avoid the cable, one end of the cable is connected to the coil through a conductive slip ring, and the other end of the cable passes through the interior of the hollow shaft and out of the hub to be connected to an external power storage device or power consumption device.

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