CN211266665U

CN211266665U - In-wheel motor

Info

Publication number: CN211266665U
Application number: CN201921824531.7U
Authority: CN
Inventors: 武君
Original assignee: Shenzhen Geniusmart Technologies Co Ltd
Current assignee: Shenzhen dousuo Technology Co.,Ltd.
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-08-14
Anticipated expiration: 2029-10-28

Abstract

The utility model provides a wheel hub motor, cup joints in epaxial wheel hub and sets up motor and the reduction gear in wheel hub including the shaft, rotate, the motor is including rotating the ground cover and locating epaxial rotor and the ring cover the stator of rotor, reduction gear connects rotor and wheel hub, the reduction ratio of reduction gear is greater than 1, the stator is fixed to be set up in wheel hub and rotate along with the wheel hub is synchronous, the utility model discloses wheel hub motor's stator is fixed in wheel hub and encircles the rotor setting, and relative static between stator and the built-in power supply, circuit connection are simple reliable, and whole wheel hub motor is built-in power supply driven integrated structure, and does not have any electrical connection with the outside, can direct mount on the frame of current vehicle, and the dismouting, change are all very convenient, and the security of assembly back vehicle is more secure.

Description

In-wheel motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a bicycle wheel hub motor.

Background

Most of the existing bicycle hub motors are of an outer rotor structure, stators of the motors are fixed, and rotors of the motors rotate relative to the stators and drive hubs to rotate. The power supply equipment of the hub motor is generally fixedly arranged outside a hub, a coil is arranged on a motor stator, the motor stator is relatively fixed with a wheel shaft, and the motor is connected with external power supply equipment through a lead by forming a hole on the wheel shaft. If the power supply equipment is integrated into the hub, the power supply equipment needs to be fixed relative to the stator by adopting the structure, and the idea is difficult to realize due to the limited internal space of the hub; or the addition of carbon brushes and slip rings to set the power supply equipment in relative rotation with the stator can reduce the reliability of the system.

SUMMERY OF THE UTILITY MODEL

In view of the above, a simple and reliable hub motor with an inner rotor structure is provided.

The wheel hub motor comprises a wheel shaft, a wheel hub which is rotatably sleeved on the wheel shaft, and a motor and a speed reducer which are arranged in the wheel hub, wherein the motor comprises a rotor which is rotatably sleeved on the wheel shaft and a stator which is sleeved on the rotor in a ring mode, the speed reducer is in transmission connection with the rotor and the wheel hub, the reduction ratio of the speed reducer is larger than 1, and the stator is fixedly arranged in the wheel hub and synchronously rotates along with the wheel hub.

Preferably, the motor further comprises a power supply device which is fixed in the hub and synchronously rotates along with the hub, and the power supply device is connected with the stator of the motor.

Preferably, the power supply device is sleeved on the motor and the speed reducer.

Preferably, the speed reducer is a planetary gear, a sun gear of the planetary gear is fixedly connected with a rotor of the motor, and an outer gear ring of the planetary gear is fixedly connected with the hub.

Preferably, the planetary gear is arranged coaxially with the motor and is located at one side of the motor in the axial direction.

Preferably, both ends of the axle protrude out of the hub.

Preferably, the stator and the rotor form a gap of 0.2-1 mm in the radial direction.

Compared with the prior art, the utility model discloses in wheel hub is fixed in to wheel hub and around the rotor setting, relative static between stator and the built-in power supply, circuit connection is simple reliable, and whole wheel hub motor is built-in power supply and driven integrated structure, and is connected with outside no electric, can directly install on the frame of current vehicle, and dismouting, change are all very convenient, and the security of assembly back vehicle is more secure.

Drawings

Fig. 1 is a partial cross-sectional view of an embodiment of the hub motor of the present invention.

Fig. 2 is an exploded view of the in-wheel motor shown in fig. 1.

Fig. 3 is a schematic structural view of an electric wheel formed by the in-wheel motor shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. One or more embodiments of the present invention are illustrated in the accompanying drawings to provide a more accurate and thorough understanding of the disclosed embodiments. It should be understood, however, that the present invention may be embodied in many different forms and is not limited to the embodiments described below.

Fig. 1-2 show a specific embodiment of the in-wheel motor of the present invention, the in-wheel motor includes a fixed wheel axle 10, a wheel hub 20 rotatably sleeved on the wheel axle 10, a driving motor 30, a speed reducer 40, and a power supply device 50. The hub 20 is a hollow cylindrical structure, and the wheel axle 10 is arranged in the center of the hub 20. The driving motor 30, the speed reducer 40 and the power supply device 50 are all fixedly arranged in the hub 20, and the whole hub motor is of an integrated structure. Wherein, the power supply device 50 supplies power to the motor 30 to rotate, the reducer 40 is connected with the motor 30 and the hub 20 in a transmission way, and drives the hub 20 to rotate at a relatively low speed. Referring to fig. 3, the electric wheel is formed by sleeving a tire 60 on the hub 20 of the hub motor of the present invention, and can be widely applied to various vehicles, such as electric bicycles, tricycles, automobiles, etc.

In this embodiment, taking the wheel of the electric bicycle as an example, the wheel axle 10 is a long round rod, and both ends of the round rod extend out of the hub 20. When the wheel is installed, only the two extending ends of the wheel shaft 10 are fixedly connected with the frame of the bicycle, no electrical connection is needed, and the wheel is simple, quick, safe and reliable. In the illustrated construction, the hub 20 is drivingly connected to a sprocket 70 of the bicycle, such that the bicycle can be driven by the motor 30, or by human power, to form an electric power assisted bicycle. In other embodiments, depending on the specific application, the wheel axle 10 may extend beyond the wheel hub 20 at only one end to be connected to a vehicle frame, and the like, and is not limited to this embodiment.

The hub 20 includes a housing 22, and an end cap 24. The housing 22 and the end cap 24 together form a cylindrical space for accommodating the motor 30, the reducer 40, and the power supply device 50. In this embodiment, the motor 30, the speed reducer 40, and the power supply device 50 are fixed in the base 22 and coaxially disposed. The end cap 24 is fixedly connected to the seat body 22 (by screws or rivets, etc.) and seals the seat body 22, so as to prevent external dust and water from entering the hub 20 and affecting electrical safety. Preferably, a control module is fixedly arranged in the hub 20, and the control module is connected with the motor 30 and is used for controlling the running speed of the motor 30, so as to control the wheel to realize speed increase, speed reduction, cruise at a constant speed, braking and the like.

The motor 30 is accommodated in the hub 20 and sleeved on the wheel axle 10, and may be a brushless direct current motor (BLDC), an asynchronous motor, a reluctance motor, or the like. In this embodiment, the driving motor 30 is an inner rotor motor, and includes a rotor 32 sleeved on the wheel axle 10 and a stator 34 sleeved on the rotor 32. A shaft hole 33 is formed in the center of the rotor 32 for passing through the wheel axle 10, the diameter of the shaft hole 33 is larger than the outer diameter of the wheel axle 10, and a bearing 36 is arranged between the wheel axle 10 and the rotor 32 for supporting the rotor 32 to rotate relative to the wheel axle 10. The outer wall surface of the rotor 32 is provided with a plurality of magnets 38, and the magnets 38 form alternating N poles and S poles along the circumferential direction of the rotor 32. The stator 34 is fixed in the hub 20, in this embodiment, the stator 34 is fixed in the seat 22 of the hub 20, and a gap of 0.2-1 mm is formed between the stator 34 and the rotor 32 in the radial direction. The stator 34 includes a plurality of coils 39, and the stator coil 39 is energized to generate a changing magnetic field to interact with the magnetic field formed by the magnet 38 of the rotor 32, so as to drive the rotor 32 to rotate around the wheel axle 10.

The speed reducer 40 is accommodated in the hub 20 and sleeved on the wheel axle 10, and is coaxially disposed with the motor 30 and located at one axial side of the motor 30. The reducer 40 is preferably a planetary gear with a reduction ratio greater than 1. The sun gear 42 of the planetary gear 40 is fixedly connected with the rotor 32 of the motor 30 through screws and the like and rotates synchronously with the rotor 32, and the outer gear ring 44 is fixedly connected with the base 22 of the hub 20 through tight fit and the like. After the rotation of the rotor 32 of the motor 30 is greatly reduced by the planetary gear 40, the hub 20 and the components fixed in the hub 20, including the stator 34 of the motor 30, the power supply device 50, the control module, etc., are driven to rotate at a relatively low speed with respect to the wheel axle 10. Since the rotational speed of the hub 20 is lower than the rotational speed of the rotor 32, a speed difference is formed between the stator 34 and the rotor 32, which rotate synchronously with the hub 20, and relative rotation is maintained therebetween.

The power supply device 50 is a battery with an annular structure, and is accommodated in the hub 20 and sleeved on the motor 30 and the speed reducer 40. In this embodiment, the battery 50 is fixed in the seat 22 of the hub 20. The battery 50 is preferably a rechargeable battery, and may be connected to an external power source to recharge the battery 50. Preferably, the battery 50 is connected to a battery management unit, which has automatic constant current, constant voltage, pulse activated charging conversion function; overcurrent, overvoltage and undervoltage automatic protection functions; battery power, output current, battery aging measurement functions, and the like.

The battery 50 is electrically connected to the stator coil 39 of the motor 30, a control module, and the like as a power source of the entire in-wheel motor. When the vehicle is started, the control module generates a signal to start the motor 30, the stator coil 39 of the motor 30 is electrified to generate an alternating magnetic field, and the alternating magnetic field interacts with the magnetic field of the rotor 32 to push the rotor 32 to rotate at a speed V1 quickly relative to the wheel axle 10. After the rotation of the rotor 32 of the motor 30 is decelerated by the decelerator 40, the driving hub 20 rotates relative to the wheel axle 10 at a relatively low speed V2 to drive the vehicle to travel. During rotation of the hub 20, the battery 50, stator 34, control module, etc. rotate synchronously with the hub 20 at speed V2 with respect to the hub 10, and at the same time rotate with respect to the rotor 32 of the motor 30 at speed scalar sum (V1+ V2), with the V1 and V2 directions being substantially opposite.

The utility model discloses in-wheel motor is after the start-up, except that shaft 10 whole in-wheel motor, including battery 50, motor 30, reduction gear 40, control module etc, wholly use shaft 10 to rotate as the center, battery 50, motor 30's stator 34, control module etc. rotates along with hub 20 is synchronous, consequently there is not relative motion between battery 50 and each electronic components, so battery 50 can conveniently be connected with motor 30's stator coil 39, realize the current commutation through the circuit, need not the brush, electrically conductive sliding ring structure, simplify in-wheel motor's structure, guarantee electrical safety.

The utility model discloses in-wheel motor's motor 30, reduction gear 40, battery 50 and control module place in all in-wheel hub 20 along with in-wheel hub 20 rotates around shaft 10, whole in-wheel motor is built-in power supply and driven integral structure, does not have any electrical connection with the outside. The stator 34 of the internal driving motor 30 of the hub motor is fixed in the hub 20 and arranged around the rotor 32, the stator 34 and the built-in power supply 50 are relatively static, and the circuit connection is simple and reliable. The utility model discloses wheel hub motor sheathes in the tire and constitutes electric wheel promptly, can be connected with the frame through shaft 10, so the utility model discloses wheel hub motor only needs simple mechanical connection can install to the frame of vehicle on, need not to consider electrical connection's problem for the dismouting of wheel, change are all very convenient, and the security of vehicle after the assembly is more secure moreover.

It should be noted that the present invention is not limited to the above embodiments, and other changes can be made by those skilled in the art according to the spirit of the present invention, and all the changes made according to the spirit of the present invention should be included in the scope of the present invention.

Claims

1. The hub motor comprises a wheel shaft, a wheel hub which is rotatably sleeved on the wheel shaft, and a motor and a speed reducer which are arranged in the wheel hub, and is characterized in that the motor comprises a rotor which is rotatably sleeved on the wheel shaft and a stator which is sleeved on the rotor in a ring mode, the speed reducer is in transmission connection with the rotor and the wheel hub, the reduction ratio of the speed reducer is larger than 1, and the stator is fixedly arranged in the wheel hub and synchronously rotates along with the wheel hub.

2. The in-wheel motor according to claim 1, further comprising a power supply unit fixed in the hub and rotating synchronously with the hub, the power supply unit being connected to the stator of the motor.

3. The in-wheel motor according to claim 2, wherein said power supply means loops around said motor and reducer.

4. The in-wheel motor according to claim 1, wherein the speed reducer is a planetary gear, a sun gear of the planetary gear is fixedly connected with a rotor of the motor, and an outer ring gear of the planetary gear is fixedly connected with the hub.

5. The in-wheel motor according to claim 4, wherein the planetary gear is disposed coaxially with the motor and on one side of the motor in the axial direction.

6. The in-wheel motor according to claim 1, wherein both ends of the wheel shaft protrude beyond the wheel hub.

7. The in-wheel motor according to claim 1, wherein the stator and the rotor form a gap of 0.2-1 mm in the radial direction.