A brushless motor electric bicycle drive system

Abstract

This invention proposes a brushless motor electric bicycle drive system, including an outer ring, a panel, and a motor. The outer ring is used to mount the tire, and the panel is detachably connected to the side of the outer ring via a connector. The motor is built into the interior of the outer ring, and fixing rods are fixedly connected to both sides of the motor, with gaskets fitted onto the fixing rods. The advantages of this invention are: Normal waterproofing; the first sealing ring compensates for assembly gaps through rubber elastic deformation, blocking most liquid water penetration; when residual water vapor contacts the magnetic fluid layer, the gradient magnetic field generated by the permanent magnet causes the magnetic fluid to form a dynamic sealing barrier. High-pressure protection: when the external water pressure is >50kPa, the viscosity of the magnetic fluid increases by 10^3 times under the action of the magnetic field, forming non-Newtonian fluid characteristics; the magnetic fluid molecular chains are oriented along the magnetic field direction, greatly reducing the permeability coefficient. This system has an excellent waterproof pass rate, effectively preventing water ingress and rusting of the outer ring and motor interior, and preventing motor malfunctions.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, and in particular to a brushless motor electric bicycle drive system. Background Technology

[0002] Existing electric bicycle hub motors have the following defects:

[0003] Single-seal structures are prone to failure: Traditional rubber seals are prone to gaps under frequent vibration (the sealing failure rate of rubber seals reaches 34% after aging);

[0004] High-pressure infiltration problem: When the wheels are wading through water, the external water pressure can break through the single-layer seal (tests show that the probability of water ingress reaches 78% when the water depth is 30cm). Utility Model Content

[0005] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0006] Therefore, one objective of this utility model is to propose a brushless motor electric bicycle drive system to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0007] To achieve the above objectives, one embodiment of the present invention provides a brushless motor electric bicycle drive system, including an outer ring, a panel, and a motor. The outer ring is used to mount a tire, and the panel is detachably connected to the side of the outer ring via a connector. The motor is built into the interior of the outer ring, and fixing rods are fixedly connected to both sides of the motor.

[0008] A washer is fitted onto the fixing rod, and a fastener is threaded onto the fixing rod;

[0009] The fixing rod is movably connected to both the panel and the outer ring, and the joint between the outer ring and the panel is filled with a first sealing ring.

[0010] The joint between the outer ring and the panel is filled with a magnetic fluid sealing layer, which is mainly installed on the surface of the outer ring.

[0011] The sealing layer is injected with magnetic fluid, and a ring of permanent magnets is embedded on the surface of the panel at the position corresponding to the sealing layer.

[0012] Preferably, as described in any of the above embodiments, the outer ring has several holes at its edge for mounting the wheel hub and tire, and the panel is made of stainless steel.

[0013] The above-mentioned technical solution is adopted: This drive system is mainly used in electric bicycles. This drive system mainly consists of two parts: the first part is the outer ring and its associated parts.

[0014] The second part is the motor and its accessories, including the panel, fixing rod, gasket, and fastener structure. This part can be separated and disassembled from the outer ring.

[0015] The rotor is installed inside the outer ring, and the motor can be regarded as the stator. When energized, it drives the outer ring to rotate at high speed. The fixing rods on both sides of the motor are installed at the rear wheel of the frame by fasteners.

[0016] Preferably, from any of the above solutions, the motor is brushless.

[0017] Preferably, in any of the above embodiments, the fastener is a washered nut, and the fixing rod is inserted into a self-sealing bearing.

[0018] The above technical solution employs a permanent magnet with moderate magnetic force that acts only on the sealing layer and does not interfere with the operation of the motor.

[0019] Two-stage synergistic sealing structure:

[0020] First seal: The joint between the panel and the outer ring is filled with a rubber first sealing ring, with the compression rate controlled at 25%-30%;

[0021] The second seal: A magnetic fluid sealing layer is set on the outer ring surface, corresponding to the permanent magnet embedded in the panel to form a magnetic barrier. The magnetic fluid is Fe3O4-based nano magnetic fluid (saturation magnetization > 450mT).

[0022] Normal waterproof:

[0023] The first sealing ring compensates for assembly gaps through the elastic deformation of rubber, blocking most of the liquid water from penetrating.

[0024] When residual water vapor comes into contact with the magnetofluid layer, the gradient magnetic field generated by the permanent magnet causes the magnetofluid to form a dynamic sealing barrier.

[0025] High-voltage protection:

[0026] When the external water pressure is greater than 50 kPa, the viscosity of the magnetofluid increases by 10^3 times under the action of the magnetic field, forming non-Newtonian fluid characteristics.

[0027] The molecular chains of the magnetic fluid are oriented along the direction of the magnetic field, which greatly reduces the permeability coefficient.

[0028] It has an excellent waterproof pass rate, effectively preventing water from entering the outer ring and inside the motor, causing rust and motor failure.

[0029] Preferably, in any of the above solutions, the connector is a hexagonal socket screw, and the first sealing ring is made of rubber.

[0030] Preferably, in any of the above solutions, the first sealing ring is on the outside and the magnetohydrodynamic sealing layer is on the inside.

[0031] Preferably, in any of the above schemes, the magnetic fluid in the sealing layer is a Fe3O4-based magnetic fluid.

[0032] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0033] This brushless motor-driven electric bicycle drive system, through the coordinated arrangement of a first sealing ring, a magnetofluid sealing layer, and a permanent magnet, is normally waterproof. The first sealing ring compensates for assembly gaps through rubber elastic deformation, blocking most liquid water penetration. When residual water vapor comes into contact with the magnetofluid layer, the gradient magnetic field generated by the permanent magnet causes the magnetofluid to form a dynamic sealing barrier. High-pressure protection: When the external water pressure is >50kPa, the viscosity of the magnetofluid increases by 10^3 times under the influence of the magnetic field, forming non-Newtonian fluid characteristics; the molecular chains of the magnetofluid align oriented along the direction of the magnetic field, greatly reducing the permeability coefficient. This system has an excellent waterproof pass rate, effectively preventing water ingress and rusting of the outer ring and inside the motor, as well as motor malfunctions.

[0034] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0036] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0037] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0038] Figure 3 This is a side view of the structure of this utility model;

[0039] Figure 4 This is a schematic diagram of the structure of the first sealing ring of this utility model.

[0040] In the diagram: 1-outer ring, 2-panel, 3-motor, 4-fixing rod, 5-gasket, 6-fastener, 7-connector, 8-first sealing ring, 9-magnetic fluid sealing layer, 10-permanent magnet. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] like Figure 1-4 As shown, this brushless motor electric bicycle drive system includes an outer ring 1, a panel 2, and a motor 3. The outer ring 1 is used to mount the tire. The panel 2 is detachably connected to the side of the outer ring 1 via a connector 7. The motor 3 is built into the inside of the outer ring 1. Fixing rods 4 are fixedly connected to both sides of the motor 3.

[0044] A washer 5 is fitted onto the fixing rod 4, and a fastener 6 is threaded onto the fixing rod 4.

[0045] The fixing rod 4 is movably connected to both the panel 2 and the outer ring 1, and the joint between the outer ring 1 and the panel 2 is filled with a first sealing ring 8.

[0046] A magnetic fluid sealing layer 9 is filled at the joint between the outer ring 1 and the panel 2. The magnetic fluid sealing layer 9 is mainly installed on the surface of the outer ring 1.

[0047] Magnetic fluid is injected into the sealing layer 9, and a ring of permanent magnets 10 is embedded on the surface of the panel 2 at the position corresponding to the sealing layer 9.

[0048] Example 1: Several holes are provided at the edge of the outer ring 1 for mounting the hub and tire. The panel 2 is made of stainless steel. This drive system is mainly used in electric bicycles. This drive system is mainly divided into two parts: the first part is the outer ring 1 and its auxiliary parts.

[0049] The second part is the motor 3 and its accessories, including the panel 2, fixing rod 4, gasket 5, fastener 6 structure, which can be separated and disassembled from the outer ring 1 as a whole.

[0050] The outer ring 1 has a rotor installed inside, and the motor 3 can be regarded as the stator. When energized, it drives the outer ring 1 to rotate at high speed. The fixing rods 4 on both sides of the motor 3 are installed at the rear wheel of the frame by fasteners 6.

[0051] Example 2: Motor 3 is brushless. Fastener 6 is specifically a washered nut, and fixing rod 4 is inserted into a self-sealing bearing. The permanent magnet 10 has moderate magnetic force, acting only on the sealing layer 9, and does not interfere with the operation of motor 3. Connector 7 is specifically an internal hex screw, and the first sealing ring 8 is made of rubber. The first sealing ring 8 is on the outside, and the magnetic fluid sealing layer 9 is on the inside. The magnetic fluid in the sealing layer 9 is specifically an Fe3O4-based magnetic fluid.

[0052] The working principle of this utility model is as follows:

[0053] Standard assembly:

[0054] After assembling the outer ring 1 with the tire, install the stainless steel panel 2 using hex screws.

[0055] The first sealing ring 8 is compressed to 72% of its original thickness, and the magnetic fluid layer 9 is injected with Fe3O4 magnetic fluid to a thickness of 0.3 mm;

[0056] Apply a torque of 35 N·m to tighten the nut with a washer, thus fixing the fixing rod 4 to the rear wheel of the frame.

[0057] High voltage test:

[0058] Simulated 8MPa high-pressure water jet impact:

[0059] The first sealing ring 8 blocks 99.2% of liquid water;

[0060] The viscosity of the magnetofluid layer 9 increases to 1200 Pa·s under the action of a magnetic field, and the water permeation rate is only 0.028 mL / min.

[0061] Compared with the prior art, the present invention has the following advantages:

[0062] This brushless motor-driven electric bicycle system, through the coordinated arrangement of a first sealing ring 8, a magnetic fluid sealing layer 9, and a permanent magnet 10, is normally waterproof. The first sealing ring 8 compensates for assembly gaps through rubber elastic deformation, blocking most liquid water penetration. When residual water vapor comes into contact with the magnetic fluid layer 9, the gradient magnetic field generated by the permanent magnet 10 causes the magnetic fluid to form a dynamic sealing barrier. High-pressure protection: When the external water pressure is >50kPa, the viscosity of the magnetic fluid increases by 10^3 times under the action of the magnetic field, forming non-Newtonian fluid characteristics; the magnetic fluid molecular chains are oriented along the direction of the magnetic field, greatly reducing the permeability coefficient. This system has an excellent waterproof qualification rate, effectively preventing water ingress and rusting of the outer ring 1 and the inside of the motor 3, and preventing motor 3 malfunctions.

Claims

1. A brushless motor electric bicycle drive system, characterized in that, It includes an outer ring (1), a panel (2), and a motor (3). The outer ring (1) is used to install a tire. The panel (2) is detachably connected to the side of the outer ring (1) via a connector (7). The motor (3) is built into the interior of the outer ring (1). Fixing rods (4) are fixedly connected to both sides of the motor (3). A washer (5) is fitted onto the fixing rod (4), and a fastener (6) is threaded onto the fixing rod (4); The fixing rod (4) is movably connected to the panel (2) and the outer ring (1), and the joint between the outer ring (1) and the panel (2) is filled with a first sealing ring (8); The joint between the outer ring (1) and the panel (2) is filled with a magnetic fluid sealing layer (9), which is mainly installed on the surface of the outer ring (1). The sealing layer (9) is injected with magnetic fluid, and a ring of permanent magnets (10) is embedded on the surface of the panel (2) at the position corresponding to the sealing layer (9).

2. The brushless motor electric bicycle drive system as described in claim 1, characterized in that: The outer ring (1) has several holes at its edge for mounting the hub and tire, and the panel (2) is made of stainless steel.

3. The brushless motor electric bicycle drive system as described in claim 2, characterized in that: The motor (3) is brushless.

4. The brushless motor electric bicycle drive system as described in claim 3, characterized in that: The fastener (6) is specifically a washer nut, and the fixing rod (4) is inserted into a self-sealing bearing.

5. The brushless motor electric bicycle drive system as described in claim 4, characterized in that: The connector (7) is specifically an internal hexagon screw, and the first sealing ring (8) is made of rubber.

6. The brushless motor electric bicycle drive system as described in claim 5, characterized in that: The first sealing ring (8) is on the outside and the magnetohydrodynamic sealing layer (9) is on the inside.

7. The brushless motor electric bicycle drive system as described in claim 6, characterized in that: The magnetic fluid in the sealing layer (9) is specifically an Fe3O4-based magnetic fluid.

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