CN115580078A

CN115580078A - Integrated brushless speed reduction type hub motor

Info

Publication number: CN115580078A
Application number: CN202211145793.7A
Authority: CN
Inventors: 贾然
Original assignee: Shanghai Fangcang Intelligent Technology Co ltd
Current assignee: Shanghai Fangcang Intelligent Technology Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-01-06

Abstract

The invention provides an integrated brushless deceleration type hub motor, which comprises: the inner stator is provided with a central hole which is axially communicated; the outer rotor is sleeved outside the inner stator, a first shaft hole is formed in the center of the end part of the first end of the outer rotor, and the outer rotor can rotate around the axis of the outer rotor; the speed reducer comprises a sun gear shaft, a planetary gear and an inner gear ring, wherein the first end of the sun gear shaft is fixed in the first shaft hole, the planetary gear is in meshing transmission with the inner gear ring and the sun gear on the sun gear shaft, the inner gear ring, the sun gear and the planetary gear are all positioned in the central hole of the inner stator, and the end surfaces of the two ends of the planetary gear and the sun gear are respectively positioned on the inner sides of the end surfaces of the two ends of the inner stator; the flange is positioned at the second end of the outer rotor, a planetary gear supporting shaft is arranged on the flange, and the planetary gear is arranged on the planetary gear supporting shaft; and one end of the hub is provided with a concave part, the inner stator, the outer rotor, the speed reducer and the flange are positioned in the concave part of the hub, and the flange is fixedly connected with the hub. The hub motor is compact in structure and small in axial size.

Description

Integrated brushless speed-reducing hub motor

Technical Field

The invention relates to the technical field of hub motors, in particular to an integrated brushless deceleration type hub motor.

Background

The wheel hub motor technology is also called wheel built-in motor technology, and its most important feature is that the power, transmission and brake devices are all integrated into the wheel hub, so that the mechanical part of the electric vehicle is greatly simplified. The hub motor technology is not a new thing, and as early as 1900, electric automobiles with hub motors equipped on front wheels are manufactured, and in the 70 s of the 20 th century, the technology is applied to the fields of mine transport vehicles and the like.

The existing hub motor is generally of an inner rotor type, the inner rotor motor of the hub motor of the inner rotor type is thick in thickness, large in installation size, small in power and small in torque under the same size, and a speed reducer needs to be externally connected to achieve the large torque, so that the occupied size and space are larger, and the dead weight is increased by a large amount; therefore, the conventional inner rotor type hub motor is not suitable for occasions with high torque requirements and narrow installation space; if the wheel hub motor is installed on a narrow space in an indirect transmission mode, a part of energy is consumed, and therefore the transmission efficiency of the wheel hub motor is reduced. Therefore, how to provide an integrated hub motor which has a compact structure and a small axial size and is suitable for being installed in a narrow space is an urgent technical problem to be solved.

Disclosure of Invention

In view of the above, the present invention provides an integrated brushless deceleration type hub motor to solve one or more problems in the prior art.

According to one aspect of the invention, the invention discloses an integrated brushless deceleration type hub motor, which comprises:

the inner stator is provided with a central hole which is penetrated along the axial direction of the inner stator;

the outer rotor is sleeved outside the inner stator, a first shaft hole is formed in the center of the first end part of the outer rotor, and the outer rotor can rotate around the axis of the outer rotor;

the speed reducer comprises a sun gear shaft, a planetary gear and an inner gear ring, wherein a first end of the sun gear shaft is fixed in a first shaft hole of the outer rotor so that the sun gear shaft and the outer rotor rotate synchronously, the planetary gear is in meshing transmission with the inner gear ring and the sun gear on the sun gear shaft, the inner gear ring, the sun gear and the planetary gear are all positioned in a central hole of the inner stator, the inner gear ring is fixed on the inner stator, and end surfaces of two ends of the planetary gear and the sun gear are respectively positioned on the inner sides of end surfaces of two ends of the inner stator;

the flange is positioned at the second end of the outer rotor, a planetary gear supporting shaft is arranged on the flange, and the planetary gear is supported on the planetary gear supporting shaft;

the hub comprises a hub, one end of the hub is provided with a concave part, the inner stator, the outer rotor, the speed reducer and the flange are all positioned in the concave part of the hub, and the flange is fixedly connected with the hub.

In some embodiments of the invention, there is a first bearing between the inner stator and the outer rotor; and/or

And a second bearing is arranged between the inner stator and the flange.

In some embodiments of the present invention, the first end of the outer rotor has an end wall, the center of the end wall has a first shaft segment extending toward the second end of the outer rotor, and the first shaft hole is located at the center of the first shaft segment.

In some embodiments of the present invention, the first bearing is located between the first shaft section and the inner stator.

In some embodiments of the present invention, the flange has a second shaft section extending toward the inner stator at a center thereof, and the second bearing is located between the second shaft section and the inner stator.

In some embodiments of the invention, the flange has a second axial bore in the centre thereof, the second end of the sun gear shaft being located in the second axial bore, and a third bearing being provided between the second end of the sun gear shaft and the flange.

In some embodiments of the present invention, the in-wheel motor further includes an outer housing, and the inner stator, the outer rotor, and the speed reducer are enclosed within the outer housing.

In some embodiments of the present invention, the in-wheel motor further comprises a driver fixed to the outer housing, the driver being located between the first end of the outer rotor and the outer housing.

In some embodiments of the present invention, the in-wheel motor further includes an encoder, the encoder is located between the outer rotor and the outer housing, and the encoder is fixed on the outer rotor or the sun gear shaft.

In some embodiments of the present invention, the number of the planetary gears is 3, and the 3 planetary gears are spaced and uniformly distributed along the circumference of the flange.

The integrated brushless speed reduction type hub motor disclosed by the embodiment of the invention adopts an outer rotor structure, the sun gear, the planetary gear and the inner gear ring of the speed reducer are all positioned in the central hole of the inner stator, and the end surfaces of the two ends of the planetary gear and the sun gear are respectively positioned on the inner sides of the end surfaces of the two ends of the inner stator. In addition, the output of the outer rotor of the hub motor is directly output to the hub through a planetary reducer formed by combining the sun gear and the planetary gear, so that the hub is driven to rotate, the power density of the output of the motor is improved, and high-efficiency energy output is realized.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to what has been particularly described hereinabove, and that the above and other objects that can be achieved with the present invention will be more clearly understood from the following detailed description.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For purposes of illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary apparatus actually manufactured according to the present invention. In the drawings:

fig. 1 is a front sectional view of an integrated brushless deceleration type hub motor according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an integrated brushless deceleration type hub motor according to an embodiment of the present invention.

Reference numerals are as follows: inner stator 110 outer rotor 120 sun gear shaft 210 planet gear 220 ring 230 flange 300 hub 400 recess 410 first bearing 510 second bearing 520 third bearing 530 end wall 121 first shaft segment 122 protruding ring 111 front plate 610 rear plate 620 cylinder 630 driver 710 encoder 720

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.

It should be emphasized that the term "comprises/comprising/comprises/having" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar components, or the same or similar steps.

Fig. 1 is a front cross-sectional view of a hub-motor integrated brushless speed-reducing hub motor according to an embodiment of the present invention, which includes at least an inner stator 110, an outer rotor 120, a speed reducer, a flange 300 and a hub 400, as shown in fig. 1. Referring to fig. 1, the inner stator 110 has a center hole penetrating along an axial direction thereof; the outer rotor 120 is sleeved outside the inner stator 110, a first end center of the outer rotor 120 is provided with a first shaft hole, and the outer rotor 120 can rotate around the axis thereof; the speed reducer comprises a sun gear shaft 210, a planetary gear 220 and an inner gear ring 230, wherein a first end of the sun gear shaft 210 is fixed in a first axial hole of the outer rotor 120, so that the sun gear shaft 210 and the outer rotor 120 rotate synchronously, the planetary gear 220 is in meshing transmission with the inner gear ring 230 and the sun gear on the sun gear shaft 210, the inner gear ring 230, the sun gear and the planetary gear 220 are all positioned in a central hole of the inner stator 110, the inner gear ring 230 is fixed on the inner stator 110, and end surfaces of two ends of the planetary gear 220 and the sun gear are respectively positioned on the inner sides of end surfaces of two ends of the inner stator 110; the flange 300 is located at the second end of the outer rotor 120, a planetary gear supporting shaft is arranged on the flange 300, and the planetary gear 220 is supported on the planetary gear supporting shaft; a hub 400, one end of the hub 400 having a recess 410, the inner stator 110, the outer rotor 120, the reducer and the flange 300 all being located in the recess 410 of the hub 400, and the flange 300 being fixedly connected to the hub 400.

Specifically, the outer rotor 120 has a hollow portion, and the inner stator 110 is located in the hollow portion of the outer rotor 120, i.e., the outer rotor 120 is sleeved outside the inner rotor, and the outer rotor 120 is rotatable about its own axis; the outer rotor 120 is coaxially disposed with the inner stator 110, and in this case, it can also be understood that the outer rotor 120 rotates around the central axis of the inner stator 110. Referring to fig. 1 and 2, the left end of the sun gear shaft 210 is disposed in the first shaft hole of the outer rotor 120, and the first shaft hole of the outer rotor 120 is disposed at the left end of the outer rotor 120, so that the left end of the sun gear shaft 210 is fixedly connected to the first shaft hole of the outer rotor 120, and the sun gear shaft 210 extends rightward from the left end of the outer rotor 120, and passes through the central hole of the inner stator 110, until it extends to the right side of the right end of the inner stator 110. The planetary gear 220 positioned in the central hole of the inner stator 110 is positioned close to the right end of the inner stator 110, and at this time, the sun gear is specifically positioned at a position corresponding to the planetary gear 220; in addition, in order to ensure stable operation of the planetary gear 220, the ring gear 230 is fixed on the hole wall of the center hole of the inner stator. The planetary gear 220 is positioned between the inner gear ring 230 and the sun gear, and the planetary gear 220 is in meshing transmission with the inner gear ring 230 and the sun gear; wherein the inner gear ring 230 and the inner stator 110 may be an integral structure, and at this time, gear teeth are correspondingly provided on a hole wall of a central hole of the inner stator 110 to serve as a fixed inner gear ring 230; in addition, the inner gear ring 230 and the stator may be a separate structure, and the inner gear ring 230 may be detachably fixed in the central hole of the inner stator 110.

In the above embodiment, the end surfaces of the planetary gear 220 and the sun gear are respectively located at the inner sides of the end surfaces of the inner stator 110, it can also be understood that the sun gear and the planetary gear 220 are integrally integrated in the central hole of the inner stator 110, and this arrangement preferably reduces the axial dimension of the in-wheel motor, so that the in-wheel motor is more flattened. Since the inner stator 110 is entirely located within the hollow portion of the outer rotor 120, the sun gear and the planetary gear 220 may also be considered to be both integrated within the hollow portion of the outer rotor 120; in the embodiment shown in fig. 1, the right end surface of the outer rotor 120 is not flush with the right end surface of the inner stator 110, i.e., the right end surface of the outer rotor 120 is located at the left side of the right end surface of the inner stator, and this is set so that a certain gap is reserved between the right end surface of the outer rotor 120 and the flange 300 to reduce the friction force when the outer rotor 120 rotates. The second end of the outer rotor 120 is the right end of the hub motor shown in fig. 1, and at this time, the left end of the flange 300 is provided with a planetary gear support shaft, which is arranged at a position of the flange 300 corresponding to the planetary gear 220, and the planetary gear support shaft is fixedly connected with the flange 300, and the planetary gear 220 can rotate around the axis of the planetary gear support shaft, and because the inner gear ring 230 is fixed on the inner stator 110, the planetary gear 220 can also perform a revolving motion around the sun gear shaft 210, and further the revolving motion of the planetary gear 220 drives the flange 300 to rotate around the central axis of the flange 300. The flange 300 is used as an output end of the speed reducer, and the flange 300 is further fixedly connected with the hub 400, so that the hub 400 and the flange 300 can move synchronously. In this embodiment, the flange 300 is used to further output the output power of the reducer to the hub 400, and at the same time, the planetary gear supporting shaft on the flange 300 limits the position of the planetary gear 220. In this embodiment, the flange for connecting with the hub is provided with the planetary gear support shaft for supporting the planetary gear, and the planet carrier of the planetary reducer can be considered as being of an integral structure with the flange, and this arrangement optimizes the number of components of the speed-reducing hub motor, thereby also reducing the axial size of the hub motor.

As can be seen from fig. 1, the hub 400 is located at the right end of the flange 300, the left end of the hub 400 has a recess 410, the inner stator 110, the outer rotor 120, the speed reducer and the flange 300 are all located in the recess 410, and the flange 300 and the hub 400 can be detachably connected by screws or bolts. When the outer rotor 120 drives the flange 300 to rotate through the speed reducer, the flange 300 is fixedly connected with the hub 400, and the hub 400 and the flange 300 can rotate synchronously. The integrated speed-reducing hub motor overcomes the defect of small volume, high power and low density of the existing motor because a planetary reducer is integrated in the central hole of the inner stator 110 of the motor, and can output a very high rotating speed or torque on the premise of extremely small installation space. In addition, the outer circumference of the hub 400 is further coated with a PU material. In this embodiment, the output of the reducer is transmitted to the hub 400 through the flange 300, and the narrowest installation of the single-sided flange 300 is realized, so that the axial size of the hub motor is reduced.

In some embodiments of the present invention, the inner stator 110 and the outer rotor 120 have a first bearing 510 therebetween; and/or a second bearing 520 is provided between the inner stator 110 and the flange 300. The bearings are provided between the inner stator 110 and the outer rotor 120 and between the inner stator 110 and the flange 300, not only reducing the frictional force between the outer rotor 120 and the inner stator 110 and between the inner stator 110 and the flange 300, but also further improving the concentricity of the inner stator 110, the outer rotor 120 and the flange 300.

Specifically, a first end of the outer rotor 120 has an end wall 121, a center of the end wall 121 has a first shaft segment 122 extending toward a second end of the outer rotor 120, and the first shaft hole is located at a center of the first shaft segment 122. Referring to fig. 1, the end wall 121 is located at the left end of the outer rotor 120, and the outer rotor 120 is in a barrel-shaped structure with an open right end, and the first shaft segment 122 is located in the hollow portion of the outer rotor 120. The left end of the sun gear shaft 210 and the first shaft hole can be in interference fit, and at this time, the sun gear shaft 210 and the outer rotor 120 rotate synchronously.

Further, the first bearing 510 is sleeved on the first shaft section 122, i.e., the first bearing 510 is located between the first shaft section 122 and the inner stator 110. Specifically, both ends of the inner stator 110 may respectively have a protruding ring 111, an inner aperture of the protruding ring 111 is larger than a diameter of the first shaft section 122, and the first bearing 510 is located between the first shaft section 122 and the protruding ring 111 on the left side of the inner stator 110; illustratively, the first bearing 510 is axially positioned in the form of a shoulder, a segment retainer, or an end retainer, among others. It should be understood that the specific positioning manner, the installation position, etc. of the first bearing 510 in this embodiment are only an example, and in other embodiments, the positioning manner, the installation position, etc. of the first bearing 510 may also be changed according to the specific structures of the inner stator 110 and the outer rotor 120; it should be noted that the first bearing 510 should achieve rotational support of the outer rotor 120 to achieve an effect of reducing a frictional force between the outer rotor 120 and the inner stator 110.

Further, the center of the flange 300 has a second shaft section extending toward the inner stator 110, and the second bearing 520 is located between the second shaft section and the inner stator 110. Since the flange 300 is located at the right end of the outer rotor 120, the inner stator 110 and the reducer, the second shaft section is located at the left side of the flange 300, and particularly, at the center portion of the left side of the flange 300. In the case that the inner stator 110 has a male ring 111 at the right end for mounting the second bearing 520, the second bearing 520 is located between the second shaft section and the male ring 111 at the right side of the inner stator 110, i.e., the second bearing 520 is nested on the second shaft section. Correspondingly, the axial positioning manner of the second bearing 520 may specifically be a shaft shoulder, an end retainer ring, or the like. The second bearing 520 is similar to the first bearing 510 in that the positioning manner, the installation position, etc. may be changed according to the specific structures of the flange 300 and the inner stator 110, but it should be noted that the second bearing 520 should serve as a support when the flange 300 rotates to serve to reduce the friction between the flange 300 and the inner stator 110.

In the case of the flange 300 having a second shaft section on the left side, further, the second shaft section has a second shaft hole therein, and the second end of the sun gear shaft 210 is located in the second shaft hole. The second end of the sun gear shaft 210 refers to the right end of the sun gear shaft 210 shown in fig. 1, and the right end of the sun gear shaft 210 is inserted into the second axial hole. Since the left end of the sun gear shaft 210 and the outer rotor 120 rotate synchronously and the flange 300 serves as an output end of the reducer, it is ensured that no rotational interference exists between the flange 300 and the sun gear shaft 210, and therefore a third bearing 530 is further disposed between the second end of the sun gear shaft 210 and the flange 300. The third bearing 530 is used for enabling the sun gear shaft 210 and the flange 300 to stably perform relative rotation movement, and meanwhile, the third bearing 530 plays a role in improving concentricity between the sun gear shaft 210 and the flange 300 and reducing rotation friction force between the sun gear shaft 210 and the flange 300, so that the service life of the in-wheel motor is further prolonged.

In an embodiment, the in-wheel motor further includes an outer housing for enclosing the inner stator 110, the outer rotor 120 and the reducer. The inner stator 110 includes a silicon steel magnetic pole, which generates strong magnetism after being energized, so that the outer rotor 120 is rotated, and the silicon steel magnetic pole is fixed on the outer case at this time. Referring to fig. 1, the outer housing includes a cylinder 630, and a front plate 610 and a rear plate 620 located at two ends of the cylinder 630, the front plate 610, the rear plate 620, and the cylinder 630 are detachably connected by screws or bolts, the cylinder 630 is sleeved outside the outer rotor 120, and in order to enable the inner stator 110 and the outer rotor 120 to better dissipate heat, a gap is formed between the outer rotor 120 and a wall of the cylinder 630, and an inner diameter of the cylinder 630 is greater than an outer diameter of the outer rotor 120. In this embodiment, the front plate 610 and the rear plate 620 of the outer housing are detachably connected to the cylinder 630, so as to facilitate installation and maintenance of the motor and the speed reducer inside the outer housing.

Further, the flange 300 may also be encapsulated in the outer shell, and at this time, a bolt through hole may be correspondingly reserved in the middle of the front plate 610 of the outer shell for the connection between the flange 300 and the hub 400, and at this time, the connection bolt between the hub 400 and the flange 300 passes through the bolt through hole. The outer rotor 120, the inner stator 110, the reducer and the flange 300 are all encapsulated in the outer shell, so that external impurities are prevented from entering the inner part of the outer shell to damage internal components, the components in the outer shell are protected to a certain extent, and the service life of the hub motor is indirectly prolonged.

In one embodiment, the hub motor further comprises a driver 710, the driver is fixed on the outer housing, and the driver 710 is located between the first end of the outer rotor 120 and the outer housing. The PCB of the driver 710 is integrated with the parts such as the mcu, mos tube, encoder 720IC, and external interface. The driver 710 is specifically located between the left end wall of the outer rotor 120 and the rear plate 620 of the outer housing, and the driver 710 may also be fixed to the rear plate 620 of the outer housing. For example, a plurality of studs are disposed on the rear plate 620 of the outer casing, and at this time, the driver 710 and the studs are connected into a whole through screws, so that the driver and the rear plate 620 of the outer casing are fixed. In the invention, the hub motor is integrated with the speed reducer, so that the heat productivity of the hub motor can be reduced as small as possible on the premise of meeting the output power density, and the driver 710 is arranged in the outer shell, so that the working stability of the driver 710 is not influenced by the heat productivity of the motor. In the integrated hub motor adopted in the prior art, on the premise of ensuring the output power density, the heat productivity of the integrated hub motor is generally large, and in order to reduce the failure rate of the driver 710, the driver 710 is generally installed by a stator and a rotor far away from the motor, so that the high integration level of the existing integrated hub motor is difficult to achieve.

Further, the in-wheel motor further includes an encoder 720, the encoder 720 is located between the outer rotor 120 and the outer housing, and the encoder 720 is fixed on the outer rotor 120 or the sun gear shaft. For example, the encoder 720 may be a magnetic encoder 720, and the magnetic encoder 720 is specifically fixed at the left end of the sun gear shaft 210, and since the sun gear shaft 210 and the outer rotor 120 rotate synchronously, the magnetic encoder 720 rotates synchronously with both the sun gear shaft 210 and the outer rotor 120. Illustratively, the magnetic encoder sensor IC is integrated on the PCB board of the driver 710, and the magnetic encoder 720, which is now rotating synchronously with the sun gear shaft 210, transmits the changing magnetic field signal further to the magnetic encoder sensor IC. It should be understood that in practical use, an encoder with a certain precision can be adopted according to actual needs, and the encoder can also be an absolute encoder or an incremental encoder.

In one embodiment, the number of the planetary gears 220 is 3, and the 3 planetary gears 220 are spaced and uniformly distributed along the circumference of the flange 300. Since the planetary gears 220 are supported on the planetary gear supporting shafts on the flange 300, at this time, at least three planetary gear supporting shafts are correspondingly arranged on the flange 300, and the three planetary gear supporting shafts are uniformly distributed at intervals in the circumferential direction of the flange 300, and at this time, the included angle between any two planetary gears 220 is 120 degrees. It should be understood that the limitation of 3 planetary gears 220 in this embodiment is only a preferred example, and in other embodiments, the number of planetary gears 220 may be more; and the plurality of planetary gears 220 may be non-uniformly arranged in the circumferential direction of the sun gear shaft 210; for example, when the number of the planetary gears 220 is three, the included angle between each adjacent two planetary gears 220 may also be 120 °, 100 °, 140 °, and the like, respectively. It should be noted that, when the plurality of planetary gears 220 are uniformly arranged along the circumferential direction of the sun gear shaft 210 or the flange 300, the force uniformity of each planetary gear 220 during the revolution can be ensured at this time.

In the above embodiment, since the planetary gear supporting shafts are all disposed on the flange 300, the flange 300 can be regarded as the planet carrier of the speed reducer, and the speed reducer adopts a transmission mode that the sun gear is input, the ring gear is fixed, and the planet carrier is output. When the planetary gear supporting shafts are located on the flange 300, it can be considered that the planet carrier of the planetary gear reducer is integrated with the flange 300, in addition, the planetary gear reducer may also include a separate planet carrier, and at this time, the planet carrier also has the same number of planetary gear supporting shafts as the number of the planetary gears 220, and in order to make the flange 300 and the planet carrier rotate synchronously, the flange 300 and the planet carrier may be further connected. It can be understood that the present application, which provides the planetary gear support shafts directly on the flange 300, eliminates the planet carrier member, thereby further reducing the axial size of the in-wheel motor and reducing the cost.

The integrated brushless speed reduction type hub motor in the embodiment of the invention realizes modular design, the hub motor with the modular design is convenient to disassemble and is suitable for driving wheels with different sizes, the driving wheels with different sizes can be obtained by replacing hubs of the hub motor with the modular design, and the hub motor with the modular design can obtain different speed reduction ratios by selecting speed reducers with different parameters. The hub motor integrates the encoder and the driver, the number of connecting wires is reduced, wiring complexity is reduced, the hub motor is integrally connected with the outside through the CAN bus, debugging of equipment is facilitated, the phenomenon that the hub motor or the equipment is damaged due to wiring errors is avoided, the reliability of motor operation is improved, and safety in the operation process of the equipment is improved. Through the embodiment, the integrated brushless deceleration type hub motor disclosed by the invention has the advantages of small axial size, compact structure, high integration level, high power density, high energy output efficiency, light weight and suitability for occasions with narrow installation space.

It should also be noted that the exemplary embodiments noted in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed at the same time.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated brushless speed-reducing hub motor, comprising:

the speed reducer comprises a sun gear shaft, a planetary gear and an inner gear ring, wherein the first end of the sun gear shaft is fixed in a first shaft hole of the outer rotor so as to enable the sun gear shaft and the outer rotor to rotate synchronously, the planetary gear is in meshing transmission with the inner gear ring and the sun gear on the sun gear shaft, the inner gear ring, the sun gear and the planetary gear are all positioned in a central hole of the inner stator, the inner gear ring is fixed on the inner stator, and the end surfaces of the two ends of the planetary gear and the sun gear are respectively positioned on the inner sides of the end surfaces of the two ends of the inner stator;

2. The integrated brushless speed-reduction hub motor of claim 1, wherein the inner stator and the outer rotor have a first bearing therebetween; and/or

And a second bearing is arranged between the inner stator and the flange.

3. The integrated brushless speed-reduced hub motor of claim 2, wherein the first end of the outer rotor has an end wall, the center of the end wall has a first shaft segment extending toward the second end of the outer rotor, and the first shaft hole is located at the center of the first shaft segment.

4. The integrated brushless speed-reduced hub electric machine of claim 3, wherein the first bearing is located between the first shaft segment and the inner stator.

5. The integrated brushless speed-reduced hub motor of claim 2, wherein the center of the flange has a second shaft segment extending toward the inner stator, and the second bearing is located between the second shaft segment and the inner stator.

6. The integrated brushless speed-reducing in-wheel motor according to claim 1, wherein the flange has a second axial hole in the center, the second end of the sun gear shaft is located in the second axial hole, and a third bearing is provided between the second end of the sun gear shaft and the flange.

7. The integrated brushless speed-reducing hub motor according to any one of claims 1 to 6, further comprising an outer housing, wherein the inner stator, the outer rotor and the speed reducer are enclosed within the outer housing.

8. The integrated brushless speed-reducing hub motor of claim 7, further comprising a driver secured to the outer housing and positioned between the first end of the outer rotor and the outer housing.

9. The integrated brushless speed reducing in-wheel motor according to claim 7, further comprising an encoder located between the outer rotor and the outer housing, the encoder being fixed to the outer rotor or to the sun gear shaft.

10. The integrated brushless speed-reducing hub motor according to claim 1, wherein the number of the planetary gears is 3, and the 3 planetary gears are spaced and uniformly distributed along the circumferential direction of the flange.