Double-rotor hub motor

Abstract

The invention provides a double-rotor hub motor, which comprises a hub, an outer rotor, an outer stator, an inner rotor, an inner stator and a main shaft, and is characterized in that the interior of the hub is hollow, and the hub is mounted on the main shaft through a bearing; the outer stator and the inner stator are installed in the hub, the inner stator is located in the middle of the outer stator, and the outer stator and the inner stator are both fixedly connected with the main shaft. And the outer rotor is connected with the circumferential inner wall of the hub and surrounds the periphery of the outer stator. The hub is compact in structure, the driving function and the power generation function are integrated in the hub, the battery can be charged through kinetic energy generated when a vehicle slides and brakes, the cruising ability of the vehicle is improved, the inner rotor is driven to rotate after the rotating speed of the hub is multiplied through the planetary gear set, the rotating speed of the inner rotor is increased, and the service life of the inner rotor is prolonged. The power generation efficiency of the inner rotor is improved in the low-speed state of the vehicle, when the vehicle needs power, the coil of the inner stator can be powered on so as to drive the inner rotor to rotate, torque is amplified through the planetary gear set, and the power of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle drive devices, and in particular to a dual-rotor hub motor. Background Art

[0002] Electric two-wheelers or three-wheelers are widely loved by people for short-distance travel in urban areas because of their advantages such as convenient parking and low cost of use. Due to the high reliability and small size of the wheel hub motor, it is the main motor structure form of electric two-wheelers or three-wheelers. The mileage of electric vehicles mainly depends on the battery capacity, but with the national standard's restrictions on the total weight of vehicles, the battery capacity is limited. For this reason, people began to set up kinetic energy recovery to increase the vehicle's mileage. However, the speed displayed by electric two-wheelers or three-wheelers is generally 20-30 kilometers. At this speed, the generator is directly driven, and the power generation efficiency is not high. At the same time, due to the small size of electric two-wheelers, it is inconvenient to install the generator, so the current electric two-wheelers or three-wheelers generally do not have the kinetic energy recovery function. At the same time, because the wheel hub motor directly drives the wheel hub to rotate, the torque of the motor cannot be amplified. When the vehicle is overloaded or the slope is large, it is easy to lack power, so the driver can only get off the vehicle and push it. Therefore, a dual-rotor hub motor is needed, in which the outer rotor is used to drive the wheel hub and the inner rotor is used to recover kinetic energy. The outer rotor and the inner rotor are connected to each other through a planetary gear set to increase the speed of the inner rotor and ensure the power generation efficiency. At the same time, the inner rotor can also amplify the torque through the planetary gear set to increase the power of the vehicle. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a dual-rotor hub motor, in which the outer rotor is used to drive the wheel hub, and the inner rotor is used to recover kinetic energy. The outer rotor and the inner rotor are interconnected by a planetary gear set to increase the speed of the inner rotor and ensure the power generation efficiency. At the same time, the inner rotor can also amplify the torque through the planetary gear set to increase the power of the vehicle.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention proposes a dual-rotor hub motor, comprising: a hub, an outer rotor, an outer stator, an inner rotor, an inner stator, and a main shaft, wherein the hub is hollow inside and is mounted on the main shaft via a bearing; the outer stator and the inner stator are mounted in the hub, the inner stator is located in the middle of the outer stator, and both the outer stator and the inner stator are fixedly connected to the main shaft; the outer rotor is connected to the circumferential inner wall of the hub, and the outer rotor surrounds the outer circumference of the outer stator; the inner rotor is mounted on the main shaft via a bearing, and one side of the inner rotor extends into the space between the outer stator and the inner stator; the main shaft, the hub, and the inner rotor are interconnected via a planetary gear set.

[0006] Furthermore, the wheel hub comprises a wheel rim, a first side cover, and a second side cover, and the first side cover and the second side cover are respectively installed on both sides of the wheel rim.

[0007] Furthermore, the planetary gear set includes a ring gear, planetary gears, and a sun gear. The ring gear is installed on the outside of the sun gear, and a plurality of planetary gears are installed between the sun gear and the ring gear, and the planetary gears are connected to each other through a planet carrier.

[0008] Furthermore, the ring gear is fixedly connected to the second side cover, the planet carrier is fixedly connected to the main shaft, a connecting pipe is provided on one side of the sun gear, one end of the connecting pipe is connected to the sun gear, and the other end of the connecting pipe passes through the planet carrier and is connected to the inner rotor.

[0009] Furthermore, the planetary carrier includes a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are connected to each other, the planetary gear is installed between the first connecting plate and the second connecting plate, and the first connecting plate is fixedly connected to the main shaft, and the connecting pipe passes through the middle of the second connecting plate.

[0010] Furthermore, a boss is provided on one side of the inner rotor, and 2 to 4 protrusions are provided on the boss. One end of the connecting pipe is provided with grooves corresponding to the number of protrusions. When the connecting pipe is connected to the boss, the protrusions are inserted into the grooves.

[0011] Furthermore, the second side cover is provided with a sealing cover, the second side cover and the sealing cover mutually form a closed cavity, the planetary gear set is installed in the closed cavity, and the closed cavity is filled with lubricating oil.

[0012] Furthermore, a plurality of permanent magnets are fixed on the inner wall of the outer rotor and the inner wall of the inner rotor, and a plurality of coils are wound around the outer stator and the inner stator.

[0013] Furthermore, the main shaft is hollow inside and has through holes on both sides, and the coils on the outer stator and the inner stator are connected to the outside through wires, and the wires pass through the inside of the main shaft.

[0014] Furthermore, a connection cover is provided on one side of the outer stator, a middle portion of the connection cover is connected to the main shaft, and a side surface outside the connection cover is connected to a side surface of the outer stator.

[0015] Beneficial effects of the present invention:

[0016] 1. The outer rotor, outer stator, inner rotor and inner stator are nested with each other to form a compact structure. The driving and power generation functions are integrated in the wheel hub, so that the wheel hub motor has kinetic energy recovered from the vehicle's kinetic energy. The kinetic energy during vehicle coasting and braking can be used to charge the battery, thereby improving the vehicle's endurance.

[0017] 2. The rotation speed of the wheel hub is multiplied by the planetary gear set to drive the inner rotor to rotate, thereby increasing the rotation speed of the inner rotor and improving the power generation efficiency of the inner rotor at low vehicle speeds;

[0018] 3. When the vehicle needs power, electricity can be supplied to the coil of the inner stator to drive the inner rotor to rotate, and the torque can be amplified through the planetary gear set to increase the power of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the outer side of the present invention;

[0020] Figure 2 is a schematic structural diagram of a first side cover of the present invention;

[0021] Figure 3 is a schematic structural diagram of a planetary gear set of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the connection cover of the present invention;

[0023] Figure 5 It is a schematic diagram of the internal structure of the planetary gear set of the present invention;

[0024] Figure 6 It is a schematic diagram of the layout between the rotor and the stator of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the outer stator and the inner stator of the present invention;

[0026] Figure 8 It is a schematic diagram of the connection between the sun gear and the inner rotor of the present invention;

[0027] Fig. 9 It is an exploded schematic diagram of the inner rotor and sun gear of the planet carrier of the present invention;

[0028] Fig.10 It is a schematic structural diagram of the sealing cover of the present invention;

[0029] Fig.11 It is a schematic diagram of the connection between the gear ring and the second side cover of the present invention;

[0030] Fig.12 It is a cross-sectional schematic diagram of the present invention;

[0031] In the figure: 1-wheel hub, 101-wheel rim, 102-first side cover, 103-second side cover, 104-cover, 2-outer rotor, 3-outer stator, 301-connecting cover, 4-inner rotor, 401-boss, 5-inner stator, 6-main shaft, 7-planetary gear set, 701-ring gear, 702-planetary gear, 703-sun gear, 704-planet carrier, 705-connecting pipe, 7041-first connecting plate, 7042-second connecting plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] like Figures 1 to 12 As shown, an embodiment of the present invention provides a dual-rotor hub motor, comprising: a hub 1, an outer rotor 2, an outer stator 3, an inner rotor 4, an inner stator 5, and a main shaft 6. The hub 1 is hollow inside, and the hub 1 is mounted on the main shaft 6 through a bearing; the outer stator 3 and the inner stator 5 are mounted in the hub 1, the inner stator 5 is located in the middle of the outer stator 3, and the outer stator 3 and the inner stator 5 are both fixedly connected to the main shaft 6; the outer rotor 2 is connected to the circumferential inner wall of the hub 1, and the outer rotor 2 surrounds the outer periphery of the outer stator 3; the inner rotor 4 is mounted on the main shaft 6 through a bearing, and one side of the inner rotor 4 extends into the space between the outer stator 3 and the inner stator 5; the main shaft 6, the hub 1, and the inner rotor 4 are interconnected through a planetary gear set 7.

[0036] The dual-rotor hub motor of the present invention is mainly used in electric two-wheeled vehicles or three-wheeled vehicles. When the vehicle is running normally, the electronic control energizes the coil of the outer stator 3 to generate a rotating magnetic field, and generates suction with the permanent magnet on the outer rotor 2, so that the outer rotor 2 drives the wheel hub 1 to rotate, thereby driving the wheel. At this time, although the wheel hub 1 drives the inner rotor 4 to rotate through the planetary gear set 7, the coil of the inner stator 5 is turned on and the power generation power is zero, so it will not affect the driving force of the vehicle. When the vehicle slows down or is on a downhill section, the coil of the outer stator 3 is not energized, and the coil of the inner stator 5 is connected at the same time. The inner rotor 4 rotates at a high speed driven by the wheel hub 1, and the rotation speed of the inner rotor 4 is 2 to 3 times that of the outer rotor 2 under the action of the planetary gear set 7, so that the inner rotor 4 generates an alternating magnetic field, thereby generating current in the coil of the inner stator 5, which can charge the battery of the vehicle. The kinetic energy is converted into electrical energy through the inner rotor 4 and the inner stator 5, thereby improving the energy utilization rate and the vehicle's endurance by about 10%-15%; when the vehicle needs power to accelerate or climb, current can be passed into the coil of the inner stator 5 to drive the inner rotor 4 to rotate, and the torque of the inner rotor 4 can be amplified by 2 to 3 times by the planetary gear set 7 and then transmitted to the wheel hub 1, and drive the wheel hub 1 to rotate together with the outer rotor 2, thereby improving the power of the vehicle.

[0037] Preferably, if Fig.12 As shown, the wheel hub 1 includes a wheel rim 101, a first side cover 102, and a second side cover 103. The first side cover 102 and the second side cover 103 are respectively installed on both sides of the wheel rim 101. The wheel rim 101, the first side cover 102, and the second side cover 103 form a closed space to prevent external dust from entering the wheel hub 1 and protect the smooth rotation of the bearings and gears.

[0038] Specifically, Figure 3 , Figure 5 As shown, the planetary gear set 7 includes a ring gear 701, planetary gears 702, and a sun gear 703. The ring gear 701 is installed on the outside of the sun gear 703, and multiple planetary gears 702 are installed between the sun gear 703 and the ring gear 701. The planetary gears 702 are interconnected through a planet carrier 704. The planetary gear set 7 has the function of amplifying the rotation speed and increasing the torque. It can increase the speed of the inner rotor 4 during power generation and increase the torque of the inner rotor 4 during acceleration.

[0039] In a preferred embodiment, Fig.11As shown, the ring gear 701 is fixedly connected to the second side cover 103, the planet carrier 704 is fixedly connected to the main shaft 6, and a connecting pipe 705 is provided on one side of the sun gear 703. One end of the connecting pipe 705 is connected to the sun gear 703, and the other end of the connecting pipe 705 passes through the planet carrier 704 and is connected to the inner rotor 4. When generating electricity, the second side cover 103 rotates under the inertia of the vehicle, and at the same time drives the ring gear 701 to rotate. Since the planet carrier 704 is fixedly connected to the main shaft 6, the planet carrier 704 remains stationary, so that the ring gear 701 can drive the sun gear 703 to rotate through the planet gear 702, and the speed ratio of the ring gear 701 to the sun gear 703 is equal to the gear number ratio. The number of teeth of the ring gear 701 is 2-3 times that of the sun gear 703, thereby doubling the speed of the sun gear 703, making the speed of the inner rotor 4 2-3 times that of the hub 1. Even at a low speed, the vehicle can make the inner rotor 4 rotate at a high speed, thereby improving the efficiency of power generation. When the vehicle needs power, the inner stator 5 is energized to provide the inner rotor 4 with driving force, which drives the sun gear 703 to rotate and is transmitted to the ring gear 701 through the planetary gears 702. During this process, the torque of the inner rotor 4 is amplified and drives the wheel hub 1 to rotate together with the outer rotor 2.

[0040] In a preferred embodiment, Figure 3 , Figure 5 As shown, the planetary carrier 704 includes a first connecting plate 7041 and a second connecting plate 7042, the first connecting plate 7041 and the second connecting plate 7042 are connected to each other, the planetary gear 702 is installed between the first connecting plate 7041 and the second connecting plate 7042, and the first connecting plate 7041 is fixedly connected to the main shaft 6, so that the planetary carrier 704 and the main shaft 6 are rigidly connected, and the connecting tube 705 passes through the middle of the second connecting plate 7042, so as to facilitate the connection between the sun gear 703 and the inner rotor 4, and facilitate the linkage between the sun gear 703 and the inner rotor 4.

[0041] Specifically, Figure 8 , Fig. 9 As shown, a boss 401 is provided on one side of the inner rotor 4, and 2 to 4 protrusions are provided on the boss 401. One end of the connecting tube 705 is provided with grooves corresponding to the number of protrusions. When the connecting tube 705 is connected to the boss 401, the protrusions are inserted into the grooves, which facilitates the axial assembly of the inner rotor 4 and the connecting tube 705, reduces the difficulty of processing parts, and reduces the difficulty of assembly.

[0042] In a specific embodiment, Fig.10 As shown, the second side cover 103 is provided with a sealing cover 104, and the second side cover 103 and the sealing cover 104 mutually form a closed cavity, the planetary gear set 7 is installed in the closed cavity, and the closed cavity is filled with lubricating oil, so that the planetary gear set 7 is well lubricated to ensure the smooth rotation of each component.

[0043] Specifically, multiple permanent magnets are fixed on the inner wall of the outer rotor 2 and the inner wall of the inner rotor 4, and multiple groups of coils are wound on the outer stator 3 and the inner stator 5. The coils can generate a magnetic field after being energized to drive the rotor to rotate. At the same time, the coils can cut the magnetic flux lines in the alternating magnetic field to generate current. Since the winding methods and number of turns of the coils of the generator and the drive motor are different, in order to improve efficiency, the outer stator 3 mainly adopts the coil arrangement of the motor, which can ensure that the electrical energy is effectively converted into kinetic energy, and the inner stator 5 is mainly used for power generation. Therefore, the coil arrangement of the generator is mainly adopted, which can improve the power generation efficiency. Although the coil arrangement of the generator is less efficient as a drive motor, the inner rotor 4 is only occasionally used for driving when the vehicle needs power, and does not increase the energy consumption of the vehicle.

[0044] Preferably, the main shaft 6 is hollow inside and has through holes on both sides. The coils on the outer stator 3 and the inner stator 5 are connected to the outside through wires. The wires pass through the inside of the main shaft 6 to facilitate the connection between the electric control and the outer stators 3 and 5.

[0045] In a specific embodiment, Figure 4 As shown, a connection cover 301 is provided on one side of the outer stator 3, the middle part of the connection cover 301 is connected to the main shaft 6, and the side surface outside the connection cover 301 is connected to the side surface of the outer stator 3, so that the outer stator 3 is stably connected to the main shaft 6 to ensure smooth rotation of the hub 1.

[0046] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. A dual-rotor hub motor, characterized in that: include: A wheel hub (1), an outer rotor (2), an outer stator (3), an inner rotor (4), an inner stator (5), and a main shaft (6); the wheel hub (1) is hollow inside, and the wheel hub (1) is mounted on the main shaft (6) via a bearing; the outer stator (3) and the inner stator (5) are mounted inside the wheel hub (1), the inner stator (5) is located in the middle of the outer stator (3), and the outer stator (3) and the inner stator (5) are both fixedly connected to the main shaft (6); the outer rotor (2) is connected to the inner wall of the wheel hub (1) in the circumferential direction, and the outer rotor (2) surrounds the outer circumference of the outer stator (3); the inner rotor (4) is mounted on the main shaft (6) via a bearing, and one side of the inner rotor (4) extends into the space between the outer stator (3) and the inner stator (5); the main shaft (6), the wheel hub (1), and the inner rotor (4) are connected to each other via a planetary gear set (7).

2. A dual-rotor hub motor according to claim 1, characterized in that: The wheel hub (1) comprises a wheel rim (101), a first side cover (102), and a second side cover (103); the first side cover (102) and the second side cover (103) are respectively mounted on two sides of the wheel rim (101).

3. A dual-rotor hub motor according to claim 2, characterized in that: The planetary gear set (7) comprises a ring gear (701), planetary gears (702), and a sun gear (703); the ring gear (701) is mounted on the outside of the sun gear (703); a plurality of planetary gears (702) are mounted between the sun gear (703) and the ring gear (701); and the planetary gears (702) are connected to each other via a planet carrier (704).

4. A dual-rotor hub motor according to claim 3, characterized in that: The ring gear (701) is fixedly connected to the second side cover (103), the planet carrier (704) is fixedly connected to the main shaft (6), and a connecting pipe (705) is provided on one side of the sun gear (703), one end of the connecting pipe (705) is connected to the sun gear (703), and the other end of the connecting pipe (705) passes through the planet carrier (704) and is connected to the inner rotor (4).

5. A dual-rotor hub motor according to claim 4, characterized in that: The planet carrier (704) comprises a first connecting plate (7041) and a second connecting plate (7042), wherein the first connecting plate (7041) and the second connecting plate (7042) are connected to each other, the planetary gear (702) is installed between the first connecting plate (7041) and the second connecting plate (7042), and the first connecting plate (7041) is fixedly connected to the main shaft (6), and the connecting pipe (705) passes through the middle of the second connecting plate (7042).

6. A dual-rotor hub motor according to claim 4, characterized in that: A boss (401) is provided on one side of the inner rotor (4), and two to four protrusions are provided on the boss (401). One end of the connecting pipe (705) is provided with grooves corresponding to the number of protrusions. When the connecting pipe (705) is connected to the boss (401), the protrusions are inserted into the grooves.

7. A dual-rotor hub motor according to claim 4, characterized in that: The second side cover (103) is provided with a sealing cover (104), and the second side cover (103) and the sealing cover (104) mutually surround a closed cavity, the planetary gear set (7) is installed in the closed cavity, and the closed cavity is filled with lubricating oil.

8. The dual-rotor hub motor according to claim 1, characterized in that: A plurality of permanent magnets are fixed on the inner wall of the outer rotor (2) and the inner wall of the inner rotor (4), and a plurality of groups of coils are wound around the outer stator (3) and the inner stator (5).

9. A dual-rotor hub motor according to claim 8, characterized in that: The main shaft (6) is hollow inside and has through holes on both sides. The coils on the outer stator (3) and the inner stator (5) are connected to the outside through wires, and the wires pass through the inside of the main shaft (6).

10. The dual-rotor hub motor according to claim 1, characterized in that: A connection cover (301) is provided on one side of the outer stator (3); the middle portion of the connection cover (301) is connected to the main shaft (6); and the side surface of the outer side of the connection cover (301) is connected to the side surface of the outer stator (3).

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