A type of cassette flywheel hub motor for electric bicycles

Abstract

This utility model discloses a cassette flywheel hub motor for electric bicycles, including a motor spindle fixed on the bicycle frame, a hub outer ring mounted on the motor spindle via bearings, an internal gear ring fixed inside the hub outer ring, a rotor and stator disposed inside the hub outer ring, a gear reduction mechanism, and a hub end cover fixed to the hub outer ring and having a detachable freehub assembly. The gear reduction mechanism includes a sun gear fixed to the rotor, a clutch fixed relative to the stator, and planetary gears rotatably connected to the clutch and meshing with the sun gear and the internal gear ring simultaneously. This utility model features high power, small size, low noise, and long lifespan.

Description

Technical Field

[0001] This utility model relates to the field of intelligent control technology for electric bicycles, and in particular to a cassette flywheel hub motor for electric-assisted bicycles. Background Technology

[0002] With the rapid development of society, energy shortage has gradually become a bottleneck for the continued high-speed development of society. The emergence of phenomena such as energy shortage and rising gasoline prices has accelerated people's research on new energy transportation tools. Electric bicycles, which are clean, environmentally friendly, economical, durable, time-saving, labor-saving, lightweight and fast, have emerged.

[0003] Modern electric bicycles generally retain pedals to prevent them from stopping when the power supply is lost. Therefore, most electric bicycles have a single-stage rotary flywheel installed in their rear hub motors. However, because electric bicycles are relatively heavy compared to regular bicycles, pedaling on flat surfaces is quite strenuous. Pedaling is very inconvenient when encountering inclines or uneven surfaces. Therefore, rear hub motors in electric bicycles have begun to use multi-stage rotary flywheels. Multi-stage flywheels allow for flywheel switching based on road conditions during pedaling. This allows for faster pedaling on flat surfaces, and on inclines or bumpy roads, the switching of flywheels helps maintain a consistent pedaling frequency, thus conserving energy.

[0004] While multi-stage rotary freewheels offer significant improvements, they also have certain drawbacks: because the flywheels are integrated, replacing a damaged flywheel requires replacing the entire multi-stage rotary freewheel, leading to high maintenance costs. Furthermore, the rotary freewheel connects to the rear hub motor via threads on its surface, which can become increasingly tight with prolonged riding, making disassembly extremely difficult. Currently, cassette freewheels are gradually replacing rotary freewheels in the market, and hub motors using rotary freewheels cannot be connected to commonly used cassette freewheels.

[0005] Therefore, a novel hub motor for electric bicycles has been developed. This motor not only allows for the installation of multi-stage flywheels but also facilitates easy disassembly and replacement of flywheels, making it convenient to replace damaged flywheels and thus saving maintenance costs. Furthermore, the ability of this motor to connect with commercially available flywheels is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a cassette-type flywheel hub motor for electric-assisted bicycles. The cassette-type flywheel hub motor includes a hub motor and a detachable freehub assembly. The detachable freehub assembly can install cassette-type multi-stage flywheels. Therefore, electric bicycles using this motor have the function of variable speed while pedaling. At the same time, the flywheels are easy to remove, making it convenient to replace damaged flywheels, thereby saving maintenance costs. Furthermore, this motor can be connected to flywheels commonly used in the market.

[0007] To address the aforementioned problems, this utility model provides a cassette-type flywheel hub motor for electric bicycles, comprising a hub motor and a detachable tower base assembly.

[0008] The hub motor includes a motor spindle fixed to the bicycle frame, a hub outer ring mounted on the motor spindle via bearings, a rotor and stator disposed inside the hub outer ring, a gear reduction mechanism, and a hub end cap fixed to the hub outer ring. The gear reduction mechanism includes a sun gear fixed to the rotor, a clutch fixed relative to the stator, and planetary gears rotatably connected to the clutch and meshing simultaneously with the sun gear and the internal gear ring.

[0009] An internal gear ring fixed inside the outer rim of the wheel hub.

[0010] A sun gear fixed to the rotor.

[0011] A clutch that is fixed relative to the stator.

[0012] And a planetary gear that is rotatably connected to the clutch and meshes simultaneously with the sun gear and the internal gear ring.

[0013] The rotor and stator of this invention adopt an outer rotor and inner stator structure, and the rotor is a multi-pole permanent magnet rotor.

[0014] The clutch described in this utility model is a roller-type or wedge-type one-way overrunning clutch.

[0015] The planetary gear described in this invention is a special nylon gear.

[0016] The motor outer ring of this utility model is composed of a housing and an end cover that are fixed together by screws.

[0017] The detachable tower base described in this utility model refers to a card-type fly core installed on the motor end cover; rotatable

[0018] A multi-level card sleeve is dynamically installed on the card-type flight core; the installation with the card-type flight core ensures the multi-level card...

[0019] The cassette jacket, compared to the cassette fly core, features a unidirectional rotating jack and spring, and also allows for multi-stage cassette jackets and cassette fly cores.

[0020] The core is connected to a rotatable steel ball, and a ball cup controls the axial movement of the steel ball.

[0021] As can be seen from the above technical solutions, this utility model includes a hub motor and a detachable tower base assembly. If this cassette-type flywheel hub motor is installed on electric bicycles currently on the market, the electric bicycle can shift gears while pedaling in the absence of power supply. Since the cassette flywheel plates can be disassembled, the problem of having to replace the entire flywheel when replacing a damaged flywheel is solved, realizing quick replacement of individual plates and reducing maintenance costs. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and examples:

[0023] Figure 1 This is a cross-sectional view of the hub motor structure provided by this utility model.

[0024] Figure 2 This is a cross-sectional view of the detachable tower base assembly provided by this utility model.

[0025] The components include: 1. Motor spindle; 2. Sun gear; 3. Clutch; 4. Nylon wheel; 5. Internal gear ring; 6. Hub outer ring; 7. Rotor; 8. Stator; 9. Hub end cover; 10. Detachable tower base assembly; 11. Cassette fly core; 12. Sealing ring; 13. Cassette fly plate; 14. Multi-stage cassette outer sleeve; 15. Ball cup; 16. Bearing; 17. Bearing; 18. Jack; 19. Wire spring; 20. Steel ball. Detailed Implementation

[0026] The purpose of this utility model is to provide a cassette-type flywheel hub motor for electric-assisted bicycles. The cassette-type flywheel hub motor includes a hub motor and a detachable freehub assembly. The detachable freehub assembly has a multi-stage flywheel sleeve that matches the multi-stage flywheel commonly used in the market. The installation of the multi-stage flywheel allows the electric bicycle to shift gears while pedaling, and also enables the replacement of damaged flywheels individually, saving maintenance costs and making the installation and replacement of the flywheel more convenient.

[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1As shown, the hub motor provided by this utility model, like conventional technology, also has a motor spindle (1) fixed on a bicycle frame, a hub outer ring (6) mounted on the motor spindle (1) via bearings, a rotor (7) and a stator (8) disposed inside the hub outer ring (6), a gear reduction mechanism, and a hub end cap (9) fixed to the hub outer ring (6) and having a detachable base (10). The gear reduction mechanism includes a sun gear (2) fixed to the rotor (7), a clutch (3) fixed relative to the stator (8), and a planetary gear (4) rotatably connected to the clutch (3) and meshing simultaneously with the sun gear (2) and the internal gear ring (5).

[0029] like Figure 2 As shown, the detachable tower base provided by this utility model is assembled as follows: First, the multi-stage card sleeve (14) is installed on the card fly core (11). In order to enable the multi-stage card sleeve (14) to rotate unidirectionally relative to the card fly core (11), a jack (18) and a wire spring (19) are installed on the card fly core (11) before assembly, so that the multi-stage card sleeve (14) can only rotate relative to the card fly core (11) after being installed on the card fly core (11). To achieve unidirectional rotation, steel balls (20) and ball cups (15) are installed on the card fly core (11) to fix the axial movement of the steel balls (20). Finally, bearings (16) and (17) are installed on the card fly core (11) to support the card fly core between it and the motor spindle (1) so that the multi-stage card outer sleeve (14) can rotate. At this time, the card fly core (11) is fixed to the hub end cover (9), which becomes the card fly wheel hub motor provided by this utility model.

[0030] The above-mentioned hub motor planetary gears (4) are provided with three gears, which are made of special nylon gears, making them less prone to damage and reducing transmission noise.

[0031] When in operation, the rotor (7) drives the sun gear (2) to rotate, the sun gear (2) drives the planetary gear (4) meshing with it to rotate, the planetary gear (4) then drives the internal gear ring (5) meshing with it to rotate, the internal gear ring (5) drives the outer ring of the hub (6) meshing with it to rotate, so that the vehicle moves forward.

[0032] The rotor and stator of the electric bicycle cassette flywheel hub motor of this utility model adopt an outer rotor and inner stator structure, and the rotor is a multi-pole permanent magnet rotor.

[0033] The outer ring (6) of the hub of this utility model is composed of a housing and an end cap that are locked together by screws, which facilitates internal assembly. The inner toothed ring (5) is fixed on the inner wall of the outer ring (6).

[0034] To facilitate assembly and disassembly, in this specific embodiment, the cartridge fly core (11) is connected to the hub end cover (9) with screws. Since the bearing cavity of the cartridge fly core (11) extends into the hub end cover (9), compared with the technology of directly installing it on the outside of the bearing cavity, this solution saves more distance and makes it easier to achieve the standard 135mm gap of the rear drive of the electric bicycle.

[0035] The above provides a detailed description of the cassette flywheel hub motor provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. These embodiments are merely illustrative of the technical concept and features of this utility model, intended to enable those skilled in the art to understand its content and implement it, and should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made based on the spirit and essence of the main technical solution of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cassette-type flywheel hub motor for an electric moped, characterized by: The system includes a motor spindle (1) fixed to the bicycle frame, a hub outer ring (6) mounted on the motor spindle (1) via bearings, a rotor (7) and a stator (8) located inside the hub outer ring (6), a gear reduction mechanism, and a hub end cap (9) fixed to the hub outer ring (6) and having a detachable base assembly (10). The gear reduction mechanism includes a sun gear (2) fixed to the rotor (7), a clutch (3) fixed relative to the stator (8), and planetary gears (4) rotatably connected to the clutch (3) and meshing simultaneously with the sun gear (2) and the internal gear ring (5).

2. The cassette-type flywheel hub motor for an electric moped according to claim 1, characterized in that: The hub motor has an outer rotor and inner stator structure, and the rotor is a multi-pole permanent magnet rotor.

3. The cassette-type flywheel hub motor for electric assist bicycle according to claim 1, characterized in that: There are three planetary gears (4).

4. The cassette flywheel hub motor for electric bicycles according to claim 1, characterized in that: The outer ring of the hub (6) consists of a housing and a hub end cap (9) that are fastened together by screws.

5. The cassette flywheel hub motor for electric bicycles according to claim 1, characterized in that: The planetary gear (4) is a nylon gear.

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