Double-rotor hub motor

Abstract

The double-rotor hub motor comprises a hub, an outer rotor, an outer stator, an inner rotor, an inner stator and a main shaft, the interior of the hub is hollow, the hub is installed 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 inner rotor is located in the middle of the inner stator. The outer stator and the inner stator are both fixedly connected with the main shaft. The two outer rotors are connected with the inner wall in the circumferential direction of the hub, and the outer rotors surround 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 electrified to drive the inner rotor to rotate, the torque is amplified through the planetary gear set, and the vehicle power is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric vehicle drive device technical field especially relates to a double rotor wheel hub motor. BACKGROUND

[0002] Electric two-wheel or three-wheel car is widely loved by people when passing in the city short distance because of its convenient parking, low use cost and other advantages. Since the wheel hub motor is high in reliability and small in size, it is the main motor structure form of electric two-wheel or three-wheel car, and the range of electric car mainly depends on the battery capacity, but with the limitation of national standard to the total weight of vehicle, the capacity of battery is limited, therefore people begin to set up kinetic energy recovery to improve the driving range of vehicle, however the display speed of electric two-wheel or three-wheel car is generally 20-30 kilometers, the generator is directly driven at this speed, and the power generation efficiency is not high, at the same time, since the volume of electric two-wheel car is relatively small, it is not convenient to install the generator, so that the kinetic energy recovery function is not generally provided on the current electric two-wheel or three-wheel car, and since the wheel hub motor directly drives the wheel hub to rotate, the torque of motor cannot be enlarged, so that the vehicle is easy to be insufficient in power when heavy or on a large slope, so that the driver can only push the vehicle. Therefore, a double rotor wheel hub motor is needed, the outer rotor is used for driving the wheel hub, the inner rotor is used for kinetic energy recovery, the outer rotor and the inner rotor are connected with each other through the planetary gear set, the speed of the inner rotor is improved, the power generation efficiency is ensured, and the torque of the inner rotor can be enlarged through the planetary gear set, so that the power of vehicle is improved. SUMMARY

[0003] In order to solve the above problems, the utility model provides a double rotor wheel hub motor, its outer rotor is used for driving the wheel hub, and the inner rotor is used for kinetic energy recovery, the outer rotor and the inner rotor are connected with each other through the planetary gear set, the speed of the inner rotor is improved, the power generation efficiency is ensured, and the torque of the inner rotor can be enlarged through the planetary gear set, so that the power of vehicle is improved.

[0004] The utility model discloses a double rotor wheel hub motor through the following technical scheme realizes:

[0005] The utility model provides a double rotor wheel hub motor, it includes: wheel hub, outer rotor, outer stator, inner rotor, inner stator, main shaft, the wheel hub is hollow in the inside, and wheel hub is installed on the main shaft through the bearing, the outer stator and inner stator are installed in the wheel hub, and the inner stator is located in the middle part of outer stator, and the outer stator and inner stator are fixedly connected with the main shaft, the outer rotor is connected with the inner wall of wheel hub periphery, and the outer rotor is surrounded in the outer periphery of outer stator, the inner rotor is installed on the main shaft through the bearing, and one side of inner rotor extends into the space between outer stator and inner stator, the main shaft, wheel hub, inner rotor are connected with each other through the planetary gear set.

[0006] Further, the 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 arranged on two sides of the wheel rim.

[0007] Further, the planetary gear set comprises a ring gear, a plurality of planetary gears and a sun gear, the ring gear is arranged outside the sun gear, the plurality of planetary gears are arranged between the sun gear and the ring gear, and the planetary gears are connected with each other through a planet carrier.

[0008] Further, the ring gear is fixedly connected with the second side cover, the planet carrier is fixedly connected with the main shaft, one side of the sun gear is provided with a connecting pipe, one end of the connecting pipe is connected with the sun gear, and the other end of the connecting pipe is connected with the inner rotor after penetrating through the planet carrier.

[0009] Further, the planet carrier comprises a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are connected with each other, the planetary gears are arranged between the first connecting plate and the second connecting plate, and the first connecting plate is fixedly connected with the main shaft, and the connecting pipe penetrates through the middle part of the second connecting plate.

[0010] Further, one side of the inner rotor is provided with a boss, 2-4 protrusions are arranged on the boss, one end of the connecting pipe is provided with a groove corresponding to the number of the protrusions, and the protrusions are inserted into the groove when the connecting pipe is connected with the boss.

[0011] Further, the second side cover is provided with a cover, and the second side cover and the cover surround a sealed cavity, the planetary gear set is arranged in the sealed cavity, and lubricating oil is injected into the sealed cavity.

[0012] Further, a plurality of permanent magnets are fixedly arranged on the inner wall of the outer rotor and the inner wall of the inner rotor, and a plurality of coils are wound on the outer stator and the inner stator.

[0013] Further, the main shaft is hollow and is provided with through holes on two sides, the coils on the outer stator and the inner stator are connected with the outside through wires, and the wires penetrate through the inside of the main shaft.

[0014] Further, the outer stator is provided with a connecting cover on one side, the middle part of the connecting cover is connected with the main shaft, and the side surface of the outer side of the connecting cover is connected with the side surface of the outer stator.

[0015] The utility model discloses beneficial effect:

[0016] 1. By embedding the outer rotor, the outer stator, the inner rotor and the inner stator with each other, the structure is compact, the driving and power generation functions are integrated in the hub, the kinetic energy recovery of the hub motor can utilize the kinetic energy of the vehicle sliding and braking to charge the battery, and the endurance of the vehicle is improved.

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

[0018] 3. When the vehicle needs power, the coil of the inner stator can be electrified to drive the inner rotor to rotate, and the torque is amplified by the planetary gear set to improve the power of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of the first side cover of the utility model;

[0020] Figure 2 It is a structure schematic view of the first side cover of the utility model;

[0021] Figure 3 It is a structure schematic view of the planetary gear set of the utility model;

[0022] Figure 4 It is a structure schematic view of the connecting cover of the utility model;

[0023] Figure 5 It is a structure schematic view of the planetary gear set inside the utility model;

[0024] Figure 6 It is a layout schematic view between the rotor and the stator of the utility model;

[0025] Figure 7 It is a structure schematic view of the outer stator and the inner stator of the utility model;

[0026] Figure 8 It is a connecting schematic view of the sun gear and the inner rotor of the utility model;

[0027] Figure 9 It is an exploded schematic view of the planet carrier inner rotor and the sun gear of the utility model;

[0028] Figure 10 It is a structure schematic view of the sealing cover of the utility model;

[0029] Figure 11 It is a schematic view of the gear ring and the second side cover connection of the utility model;

[0030] Figure 12 It is a sectional view schematic view of the utility model;

[0031] In the figure: 1 - hub, 101 - 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 - planet 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 application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

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

[0034] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0035] For example, Figures 1 to 12As shown in the utility model one embodiment provides a kind of double rotor wheel hub motor, comprising: wheel hub 1, outer rotor 2, outer stator 3, inner rotor 4, inner stator 5, main shaft 6, wheel hub 1 inside hollow, and wheel hub 1 is installed on main shaft 6 by bearing;Outer stator 3 and inner stator 5 are installed in wheel hub 1, and inner stator 5 is located in the middle of outer stator 3, and outer stator 3 and inner stator 5 are fixedly connected with main shaft 6;Outer rotor 2 is connected with the circumferential inner wall of wheel hub 1, and outer rotor 2 is surrounded in the outer periphery of outer stator 3;Inner rotor 4 is installed on main shaft 6 by bearing, and one side of inner rotor 4 extends into the space between outer stator 3 and inner stator 5;Main shaft 6, wheel hub 1, inner rotor 4 are connected with each other by planetary gear set 7.

[0036] The double rotor wheel hub motor of the utility model is mainly applied to electric two-wheeled vehicle or three-wheeled vehicle, when the vehicle is normally driven, the coil of outer stator 3 is electrified by electric control, a rotating magnetic field is generated, and the attraction force between the permanent magnet on outer rotor 2 is generated, so that outer rotor 2 drives wheel hub 1 to rotate, thereby driving the vehicle wheel, at this time, although wheel hub 1 drives inner rotor 4 to rotate by planetary gear set 7, the coil of inner stator 5 is on, and the power generation is zero, so it will not affect the driving force of the vehicle. When the vehicle is decelerated or on the downhill section, the coil of outer stator 3 is not electrified, and the coil of inner stator 5 is connected at the same time, inner rotor 4 rotates at high speed under the drive of wheel hub 1, and the speed of inner rotor 4 is 2 to 3 times of that of outer rotor 2 under the action of planetary gear set 7, so that inner rotor 4 generates alternating magnetic field, thereby generating current on the coil of inner stator 5, which can charge the battery of the vehicle, and the kinetic energy is converted into electric energy by inner rotor 4 and inner stator 5, which improves the utilization rate of energy, and the endurance of the vehicle can be improved by about 10%-15%.

[0037] Preferably, as shown in the utility model, Figure 12 Wheel hub 1 includes rim 101, first side cover 102, second side cover 103, first side cover 102 and second side cover 103 are installed on both sides of rim 101 respectively, and a closed space is formed by rim 101, first side cover 102 and second side cover 103, which avoids external dust from entering wheel hub 1 and protects the smooth rotation of bearings and gears.

[0038] Specifically, as shown in the utility model, Figure 3 , Figure 5As shown, the planetary gear set 7 includes a ring gear 701, planetary gears 702, and a sun gear 703, the ring gear 701 is mounted outside the sun gear 703, the 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 through a planet carrier 704, the planetary gear set 7 has the effect of amplifying the rotational speed and increasing the torque, which can improve 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, as shown in Figure 11 As shown, the ring gear 701 is fixedly connected with the second side cover 103, the planet carrier 704 is fixedly connected with the main shaft 6, and the sun gear 703 is provided with a connecting pipe 705, one end of the connecting pipe 705 is connected with the sun gear 703, and the other end of the connecting pipe 705 is connected with the inner rotor 4 after penetrating through the planet carrier 704. During power generation, the second side cover 103 rotates under the driving of the inertia of the vehicle, and simultaneously drives the ring gear 701 to rotate. Since the planet carrier 704 is fixedly connected with 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 planetary gears 702. The rotational speed ratio of the ring gear 701 to the sun gear 703 is equal to the tooth number ratio, and the tooth number ratio of the ring gear 701 to the sun gear 703 is 2-3 times, thereby multiplying the rotational speed of the sun gear 703, so that the rotational speed of the inner rotor 4 is 2-3 times of the hub 1. Even if the vehicle is at low speed, the inner rotor 4 can also rotate at high speed, and the efficiency of power generation is improved. When the vehicle needs power, the inner rotor 4 is powered to have driving force, which drives the sun gear 703 to rotate, and the driving force is transmitted to the ring gear 701 through the planetary gears 702. In this process, the torque of the inner rotor 4 is amplified, and the hub 1 is driven to rotate together with the outer rotor 2.

[0040] In a preferred embodiment, as shown in Figure 3 、 Figure 5 As shown, the planet 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 gears 702 are mounted between the first connecting plate 7041 and the second connecting plate 7042, and the first connecting plate 7041 is fixedly connected with the main shaft 6, so that the planet carrier 704 is rigidly connected with the main shaft 6. The connecting pipe 705 penetrates through the middle of the second connecting plate 7042, which facilitates the connection between the sun gear 703 and the inner rotor 4 and the linkage between the sun gear 703 and the inner rotor 4.

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

[0042] In one specific embodiment, as shown in the drawings, Figure 10 As shown, the second side cover 103 is provided with a cover 104, the second side cover 103 and the cover 104 surround each other to 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 and ensures smooth rotation of each part.

[0043] Specifically, 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, a plurality of coils are wound on the outer stator 3 and the inner stator 5, the coils can generate a magnetic field after being energized, driving the rotor to rotate, and at the same time, the coils can cut the magnetic induction lines to generate current in the alternating magnetic field. Since the winding method and the number of turns of the coils of the generator and the driving motor are different, in order to improve the efficiency, the outer stator 3 mainly adopts the coil arrangement of the motor, which can ensure that the electric energy is effectively converted into kinetic energy, and the inner stator 5 is mainly used for power generation, so the coil arrangement of the generator is mainly used, which can improve the power generation efficiency. Although the coil arrangement of the generator is used as a driving motor with low efficiency, 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 both sides are provided with through holes, and 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, which facilitates the connection of the electric control with the outer stator 3 and 5.

[0045] In one specific embodiment, as shown in the drawings, Figure 4 As shown, the outer stator 3 side is provided with a connecting cover 301, the middle part of the connecting cover 301 is connected with the main shaft 6, and the side surface of the outer side of the connecting cover 301 is connected with the side surface of the outer stator 3, so that the outer stator 3 is stably connected with the main shaft 6, ensuring smooth rotation of the hub 1.

[0046] Of course, the present application also has other various embodiments, and based on the present embodiment, other embodiments obtained by those skilled in the art without any creative labor belong to the scope of protection of the present application.

Claims

1. A dual rotor wheel hub motor characterized by, It includes: 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 fixedly connected with the main shaft (6); the outer rotor (2) is connected with the circumferential inner wall of the hub (1), the outer rotor (2) is surrounded outside 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 connected with each other through a planetary gear set (7).

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

3. A dual rotor wheel motor according to claim 2, characterized in that The planetary gear set (7) includes a ring gear (701), a planetary gear (702) and a sun gear (703), the ring gear (701) is mounted outside 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 with each other through a planet carrier (704).

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

5. A dual rotor wheel motor according to claim 4, characterized in that The planet 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 with each other, the planetary gears (702) are mounted between the first connecting plate (7041) and the second connecting plate (7042), and the first connecting plate (7041) is fixedly connected with the main shaft (6), and the connecting pipe (705) penetrates through the middle of the second connecting plate (7042).

6. A dual rotor wheel motor according to claim 4, characterized in that One side of the inner rotor (4) is provided with a boss (401), the boss (401) is provided with 2 to 4 protrusions, one end of the connecting pipe (705) is provided with a groove corresponding to the number of protrusions, and the protrusions are inserted into the grooves when the connecting pipe (705) is connected with the boss (401).

7. A dual rotor wheel motor according to claim 4, characterized in that The second side cover (103) is provided with a cover (104), the second side cover (103) and the cover (104) surround each other to form a sealed cavity, the planetary gear set (7) is mounted in the sealed cavity, and lubricating oil is injected into the sealed cavity.

8. A dual rotor wheel 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 coils are wound on the outer stator (3) and the inner stator (5).

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

10. A dual rotor wheel motor according to claim 1, characterized in that, One side of the outer stator (3) is provided with a connecting cover (301), the middle part of the connecting cover (301) is connected with the main shaft (6), and the side surface of the outer side of the connecting cover (301) is connected with the side surface of the outer stator (3).

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