CN218301139U - Hub motor with axial magnetic flux built-in planetary reducer - Google Patents
Hub motor with axial magnetic flux built-in planetary reducer Download PDFInfo
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- CN218301139U CN218301139U CN202222586502.XU CN202222586502U CN218301139U CN 218301139 U CN218301139 U CN 218301139U CN 202222586502 U CN202222586502 U CN 202222586502U CN 218301139 U CN218301139 U CN 218301139U
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Abstract
The utility model provides an in-wheel motor of built-in planetary reducer of axial magnetic flux for solve the too big problem of in-wheel motor axial dimensions of built-in planetary reducer. Specifically, the hub motor comprises a first end cover, a second end cover and a planetary reduction mechanism clamped between the first end cover and the second end cover; the planetary speed reducing mechanism comprises a sun wheel, a plurality of planet wheels and an outer gear ring, wherein an axial flux motor is arranged in the sun wheel, the axial flux motor is of a double-stator single-rotor structure, a central rotor of the axial flux motor is fixed in the sun wheel, and stators on two sides of the axial flux motor are respectively fixed on a first end cover and a second end cover; the first end cover is provided with a first bearing and a second bearing, and is in running fit with the outer gear ring through the first bearing and is in running fit with the sun wheel through the second bearing; and the second end cover is provided with a third bearing and a fourth bearing, and is in running fit with the outer gear ring through the third bearing and in running fit with the sun wheel through the fourth bearing.
Description
Technical Field
The utility model relates to a wheel hub motor's technical field especially relates to a wheel hub motor of built-in planetary reducer of axial magnetic flux.
Background
Axial flux machines (also known as "disc machines") have a flux path that is different from that of a conventional radial machine, and the air gap is planar and has a field direction parallel to the machine axis. The core technical advantage of an axial flux machine is that the rotor is located on the side of the stator (rather than inside the stator) in a configuration such that the rotor has a larger diameter size, while torque = force x radius, thus enabling higher torque output with the same force.
According to the number of stators and rotors, relative positions and main magnetic circuit classification, the basic topological structure of the axial flux motor can be divided into 4 types, namely a single-stator single-rotor structure, a double-stator single-rotor structure, a single-stator double-rotor structure and a multi-disc structure, and 2 structural topologies of a double-stator single-rotor structure and a single-stator double-rotor structure are commonly used in the hub motor. As shown in fig. 1, an existing common hub motor with a planetary reduction mechanism is shown, and the planetary reduction mechanism, the hub and the motor main body of the hub motor are axially arranged, so that the axial size of the whole machine is large, and accordingly, the required installation space is also large, which limits the application range of the hub motor with reduction, and is not favorable for popularization and application of the hub motor with reduction.
Therefore, an improvement of an in-wheel motor incorporating a planetary reduction gear is required.
SUMMERY OF THE UTILITY MODEL
The utility model provides an in-wheel motor of built-in planetary reducer of axial magnetic flux for solve the too big problem of this type of in-wheel motor axial dimension.
The technical scheme of the utility model as follows:
a hub motor with a built-in planetary reducer for axial magnetic flux comprises a first end cover, a second end cover and a planetary reduction mechanism clamped between the first end cover and the second end cover; the planetary speed reducing mechanism comprises a sun wheel, a plurality of planet wheels and an outer gear ring, wherein an axial flux motor is arranged in the sun wheel, the axial flux motor is of a double-stator single-rotor structure, a central rotor of the axial flux motor is fixed in the sun wheel, and stators on two sides of the axial flux motor are respectively fixed on the first end cover and the second end cover;
the first end cover is provided with a first bearing and a second bearing, and is in running fit with the outer gear ring through the first bearing and is in running fit with the sun wheel through the second bearing; the second end cover is provided with a third bearing and a fourth bearing, and is in rotating fit with the outer gear ring through the third bearing and is in rotating fit with the sun wheel through the fourth bearing;
a center shaft in running fit with the planet wheel is arranged in the center hole of the planet wheel, and two ends of the center shaft are respectively inserted into the first end cover and the second end cover.
Optionally, the rotor of the axial flux motor is a center hub, and a first magnet and a second magnet are respectively disposed on two sides of the center hub.
Optionally, the center hub body and the sun gear are one piece.
Optionally, the stator of the axial flux motor is a stator winding, and includes a first stator winding embedded in the inner side surface of the first end cap and a second stator winding embedded in the inner side surface of the second end cap.
Optionally, the periphery of the first end cover is provided with a first annular clamping groove, the periphery of the second end cover is provided with a second annular clamping groove, the inner ring of the first bearing is clamped in the first annular clamping groove, and the inner ring of the third bearing is clamped in the second annular clamping groove.
Optionally, a first annular protrusion is convexly arranged on the inner side surface of the first end cover, a second annular protrusion is convexly arranged on the inner side surface of the second end cover, the inner ring of the second bearing is clamped outside the first annular protrusion, and the inner ring of the fourth bearing is clamped outside the second annular protrusion.
Optionally, the first end cover and the second end cover are provided with a first jack and a second jack corresponding to each planet gear, and two ends of a middle shaft of each planet gear are respectively inserted into the first jack and the second jack.
Optionally, a first clamping portion is disposed in the center of the first end cover, a second clamping portion is disposed in the center of the second end cover, and the first end cover and the second end cover are connected together by clamping of the first clamping portion and the second clamping portion.
Optionally, the front end of the first engaging portion has a prism arranged along the axial direction thereof, the front end of the second engaging portion is concavely provided with a groove corresponding to the prism, and the first engaging portion and the second engaging portion are engaged by engaging the prism with the groove.
Optionally, the first clamping portion and the second clamping portion are locked by bolts.
The utility model provides a hub motor, which comprises a first end cover, a second end cover and a planetary reduction mechanism clamped between the first end cover and the second end cover; the planetary speed reducing mechanism comprises a sun gear, a plurality of planet gears and an outer gear ring, wherein an axial flux motor is arranged in the sun gear, the axial flux motor is of a double-stator single-rotor structure, a central rotor of the axial flux motor is fixed in the sun gear, and stators on two sides of the axial flux motor are respectively fixed on a first end cover and a second end cover. The first end cover is provided with a first bearing and a second bearing, and is in rotating fit with the outer gear ring through the first bearing and is in rotating fit with the sun wheel through the second bearing; and the second end cover is provided with a third bearing and a fourth bearing, and is in running fit with the outer gear ring through the third bearing and is in running fit with the sun wheel through the fourth bearing. Therefore, the axial magnetic motor is equivalently integrated on the sun gear of the planetary reduction mechanism, and the motor part and the planetary reduction mechanism part are matched in the radial direction, so that the flattening, the compacting and the light weight of the hub motor are facilitated, and the oversize of the axial size of the hub motor is avoided; meanwhile, the first end cover and the second end cover on two sides of the planetary speed reducing mechanism are connected with the planetary speed reducing mechanism through the axial flux motor, and can support an outer gear ring of the planetary speed reducing mechanism, so that the structural strength of the hub motor is guaranteed. And, the stator part of axial flux motor directly laminates with the end cover, is favorable to the stator heat dissipation. And a center shaft which is in running fit with the center hole of the planet wheel is arranged in the center hole of the planet wheel, and two ends of the center shaft are respectively inserted into the first end cover and the second end cover, so that the first end cover and the second end cover are used as planet carriers for supporting the planet wheel, and the whole motor is more compact.
Drawings
Fig. 1 is a schematic structural diagram of a conventional hub motor with a planetary reduction mechanism;
fig. 2 is an exploded view of an embodiment of the present invention.
Fig. 3 is a schematic structural view of a center hub according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of the first end cap according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a second end cap according to an embodiment of the present invention.
Fig. 6 is a partial sectional view of an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2-6, the present invention provides an in-wheel motor of an axial flux built-in planetary reducer, which comprises a first end cap 10, a second end cap 20, and a planetary reduction mechanism sandwiched between the first end cap 10 and the second end cap 20. The planetary reduction mechanism includes a sun gear 30a, a plurality of planetary gears 33, and an outer ring gear 32, and the planetary gears 33 are located between the sun gear 30a and the outer ring gear 32, and mesh with the outer ring gear 32 and the sun gear 30 a.
A center hub 30 is provided in the sun gear 30a, and a first magnet 31 and a second magnet are provided on both sides of the center hub 30. The first stator winding 13 and the second stator winding 23 corresponding to the first magnet 31 and the second magnet are arranged on the inner side surfaces of the first end cover 10 and the second end cover 20, so that the hub body 30, the first end cover 10 and the second end cover 20 are combined to form an axial flux motor, the axial flux motor is embedded in the sun wheel 30a and forms radial fit with a planetary speed reducing mechanism, the axial size of the hub motor can be smaller, and the hub motor is flat, compact and light.
In the present embodiment, a first bearing 11 and a second bearing 12 are concentrically arranged on the first end cap 10, a third bearing 21 and a fourth bearing 22 are concentrically arranged on the second end cap 20, the first end cap 10 is rotationally engaged with the outer ring gear 32 and the sun gear 30a of the planetary reduction mechanism respectively through the first bearing 11 and the second bearing 12, and the second end cap 20 is rotationally engaged with the outer ring gear 32 and the sun gear 30a of the planetary reduction mechanism respectively through the first bearing 11 and the second bearing 12. Specifically, a first annular groove is formed in the periphery of the first end cap 10, a first annular protrusion 10a is convexly arranged on the inner side surface of the first end cap 10, the inner ring of the first bearing 11 is clamped in the first annular groove, the inner ring of the second bearing 12 is clamped outside the first annular protrusion 10a, and the outer ring of the first bearing 11 is embedded in the left inner ring groove of the outer gear ring 32, so that the first end cap 10 and the planetary reduction gear are rotatably matched. Similarly, be provided with second annular clamping groove in the periphery of second end cap 20, be equipped with the protruding 20a of second annular in the medial surface of second end cap 20, the inner circle card of second bearing 12 is established in second annular clamping groove, the inner circle card of second bearing 12 is established outside second annular protruding 20a, and the outer lane of second bearing 12 inlays and establishes in the right side inner ring clamping groove of outer ring gear 32 simultaneously, from this to realize second end cap 20 and planetary reduction mechanism's normal running fit. In addition, the first end cap 10 and the second end cap 20 can also play a good supporting role for the outer gear ring 32 of the planetary reduction mechanism, and the structural strength of the in-wheel motor is ensured.
In this embodiment, the first end cap 10 and the second end cap 20 are provided with a first insertion hole 10d and a second insertion hole 20d corresponding to each planetary gear 33, so that two ends of the central axis of each planetary gear 33 are respectively inserted into the first insertion hole 10d and the second insertion hole 20 d. A needle bearing is arranged in a central hole of the planet wheel 33, and a middle shaft is inserted in the needle bearing and is in running fit with the planet wheel 33. Therefore, the first end cap 10 and the second end cap 20 can not only support the outer ring gear 32, but also fix the planet gears 33 as a planet carrier, thereby simplifying the structure of the in-wheel motor.
In the present embodiment, the center hub 30 and the sun gear 30a are an integral component, so as to reduce the number of structural components of the hub motor and facilitate the assembly of the motor.
In the present embodiment, a first engaging portion 10b is provided at the center of the first end cap 10, a second engaging portion 20b is provided at the center of the second end cap 20, and accordingly, a relief hole is provided at the center of the center hub 30. When assembling, the first and second end caps 10 and 20 can be connected by engaging the first and second engaging portions 10b and 20 b.
Preferably, the front end of the first engaging portion 10b is provided with a prism 10c arranged along the axial direction thereof, and the front end of the second engaging portion 20b is concavely provided with a groove 20c corresponding to the prism 10c, so that the first engaging portion 10b and the second engaging portion 20b can be engaged by engaging the prism 10c with the groove 20c, and the radial locking of the first end cap 10 and the second end cap 20 is completed.
Preferably, a bolt 2525 is disposed in the second engaging portion 20b, and the bolt 2525 is used to lock the second engaging portion 20b and the first engaging portion 10b together, so as to complete the axial locking of the first end cap 10 and the second end cap 20. The radial locking is matched, so that the first end cap 10 and the second end cap 20 can be effectively connected together.
In the present embodiment, an electromagnetic brake 40 is disposed between the first end cap 10 and the center hub 30 for braking the hub motor. An encoder 50 is disposed between the first end cap 10 and the center hub 30, and the encoder 50 can feed back the position and speed information of the motor to the motor driver, so that the driver can accurately control the motor.
In the present embodiment, the first and second fixed shafts 14 and 24 are provided on the first and second end caps 10 and 20, and a tire 34 is wrapped around the outer ring gear 32. In use, the first and second stationary axles 14, 24 are placed on the target device such that the first and second end caps 10, 20 are stationary relative to the target device; then, when the first stator winding 13 and the second stator winding 23 are electrified, a sinusoidal magnetic field is generated on the first stator winding 13 and the second stator winding 23, and the sinusoidal magnetic field interacts with the fixed magnetic fields of the first magnet 31 and the second magnet on the center hub body 30, so that the center hub body 30 rotates; the center hub 30 rotates the sun gear 30a, and the sun gear 30a rotates via the planet gears 33, and the outer ring gear 32 is driven by the planet gears 33, so that the tire 34 rotates.
It should be noted that the fixing shaft may be provided on the first end cap 10 and/or the second end cap 20 according to the requirement, and the fixing shaft is not limited to be provided on both the first end cap 10 and the second end cap 20.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The hub motor of the axial magnetic flux built-in planetary reducer is characterized by comprising a first end cover, a second end cover and a planetary reduction mechanism clamped between the first end cover and the second end cover; the planetary speed reducing mechanism comprises a sun gear, a plurality of planet gears and an outer gear ring, wherein an axial flux motor is arranged in the sun gear, the axial flux motor is of a double-stator single-rotor structure, a central rotor of the axial flux motor is fixed in the sun gear, and stators on two sides of the axial flux motor are respectively fixed on the first end cover and the second end cover;
the first end cover is provided with a first bearing and a second bearing, and is in rotating fit with the outer gear ring through the first bearing and is in rotating fit with the sun wheel through the second bearing; the second end cover is provided with a third bearing and a fourth bearing, and is in rotating fit with the outer gear ring through the third bearing and is in rotating fit with the sun wheel through the fourth bearing;
a middle shaft in running fit with the planet wheel center hole is arranged in the planet wheel center hole, and two ends of the middle shaft are respectively inserted into the first end cover and the second end cover.
2. The hub motor of an axial-flux built-in planetary reducer according to claim 1, wherein the rotor of the axial-flux motor is a center hub, and a first magnet and a second magnet are respectively disposed on two sides of the center hub.
3. The in-wheel motor of an axial flux built-in planetary reducer of claim 2, wherein the center hub body and the sun gear are an integral piece.
4. The in-wheel motor of the axial magnetic flux built-in planetary reducer according to claim 2 or 3, wherein the stator of the axial magnetic flux motor is a stator winding, and comprises a first stator winding embedded in an inner side surface of the first end cover and a second stator winding embedded in an inner side surface of the second end cover.
5. The hub motor of the axial-flux built-in planetary reducer according to claim 1, wherein a first annular groove is formed in an outer periphery of the first end cover, a second annular groove is formed in an outer periphery of the second end cover, an inner ring of the first bearing is clamped in the first annular groove, and an inner ring of the third bearing is clamped in the second annular groove.
6. The hub motor of the axial-flux built-in planetary reducer as claimed in claim 4, wherein a first annular protrusion is protruded from an inner side surface of the first end cover, a second annular protrusion is protruded from an inner side surface of the second end cover, an inner ring of the second bearing is engaged with the first annular protrusion, and an inner ring of the fourth bearing is engaged with the second annular protrusion.
7. The in-wheel motor of an axial magnetic flux built-in planetary reducer according to claim 1, wherein the first end cover and the second end cover are provided with a first jack and a second jack corresponding to each planetary gear, and two ends of a center shaft of each planetary gear are respectively inserted into the first jack and the second jack.
8. The in-wheel motor of an axial magnetic flux built-in planetary reducer according to claim 1, wherein a first engaging portion is provided at a center of the first end cover, a second engaging portion is provided at a center of the second end cover, and the first end cover and the second end cover are firmly connected together by engagement of the first engaging portion and the second engaging portion.
9. The hub motor of the axial-flux built-in planetary reducer according to claim 8, wherein a prism is axially arranged at a front end of the first engaging portion, a groove corresponding to the prism is concavely arranged at a front end of the second engaging portion, and the first engaging portion and the second engaging portion are engaged by engagement of the prism and the groove.
10. The in-wheel motor of an axial flux built-in planetary reducer according to claim 9, wherein the first engaging portion and the second engaging portion are locked by a bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222586502.XU CN218301139U (en) | 2022-09-29 | 2022-09-29 | Hub motor with axial magnetic flux built-in planetary reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222586502.XU CN218301139U (en) | 2022-09-29 | 2022-09-29 | Hub motor with axial magnetic flux built-in planetary reducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218301139U true CN218301139U (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222586502.XU Active CN218301139U (en) | 2022-09-29 | 2022-09-29 | Hub motor with axial magnetic flux built-in planetary reducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218301139U (en) |
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- 2022-09-29 CN CN202222586502.XU patent/CN218301139U/en active Active
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