CN212627618U - Light electric bicycle has geared hub motor - Google Patents
Light electric bicycle has geared hub motor Download PDFInfo
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- CN212627618U CN212627618U CN202021384268.7U CN202021384268U CN212627618U CN 212627618 U CN212627618 U CN 212627618U CN 202021384268 U CN202021384268 U CN 202021384268U CN 212627618 U CN212627618 U CN 212627618U
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Abstract
The invention discloses a light electric bicycle motor with a gear hub, which comprises a main shaft, a hub, an end cover, a motor and a planetary gear reduction mechanism, wherein the motor is an axial magnetic field motor with a single-rotor single-stator fixed shaft structure and comprises a rotor assembly and a stator assembly, a rotor disc in the rotor assembly is in rolling connection with the main shaft through a bearing unit which comprises an angular contact bearing and is provided with axially parallel rolling bodies, the stator assembly comprises a plurality of stator cores made of silicon steel materials, a stator yoke disc made of the silicon steel materials and a stator frame, the stator cores are connected with the stator yoke disc or the stator yoke disc and the stator frame in a tenon-and-mortise structure, the stator yoke disc is sleeved with the stator frame, and the stator frame is fixedly connected with the main. The motor has low cost, high efficiency and wide high-efficiency interval, and can greatly improve the continuous mileage of the electric bicycle.
Description
Technical Field
The invention relates to the technical field of hub motors of electric bicycles, in particular to a hub motor with a gear in an axial magnetic field.
Background
The existing electric bicycle motors mainly comprise two types, one type is a middle motor arranged at the middle shaft part of the bicycle, and the other type is a hub motor integrated with a hub, wherein the hub motor is divided into a low-speed hub motor and a geared hub motor with a planetary gear speed reducing mechanism. Because the electric bicycle with the low-speed hub motor has hysteresis resistance, the riding function of the bicycle is seriously weakened, the hub motor with the gear is provided with a driving motor, a planetary gear reduction mechanism and a one-way clutch in the inner space of a hub and an end cover, and the electric bicycle is more suitable for light electric bicycles with good riding function and sliding capability, such as Chinese patents CN03127256.8 and CN201510104597.9 of an outer rotor motor with a through shaft structure, and U.S. patent US20050176542A1 of an inner rotor motor with a half shaft structure. The driving motors of the two hub motors are direct-current permanent magnet motors with radial magnetic fields, the high-efficiency interval is deviated to the high-power section, the driving motors usually run in the low-efficiency interval when the vehicle normally runs, and the running mileage is short.
The driving motor of the electric bicycle requires frequent starting/stopping, accelerating/decelerating, requires high torque during low speed or climbing, requires low torque during normal flat driving, has a large speed change range, and can keep stable performance during driving under various different road conditions. For example, the disc type coreless direct current motor disclosed in ZL 201620995774.7 has a double-rotor structure, and the axial magnetic field motor with the coreless structure consumes more rare earth permanent magnets, which is obviously insufficient in economy.
The axial magnetic field motor with the iron core has small magnetic leakage, high electromagnetic density and wide high-efficiency interval, and the electrical performance of the axial magnetic field motor is embodied on the hub motor and has obvious advantages.
Disclosure of Invention
The invention aims to provide a light electric bicycle motor with a gear hub, which is used for applying an axial magnetic field motor with high efficiency and wide high-efficiency range to the field of electric bicycles with low cost under the existing production technical conditions and meeting the requirement of people on the increase of the driving mileage.
The technical idea is as follows: the driving motor is an axial magnetic field motor with a single-rotor single-stator structure and an iron core, is in a fixed-shaft structure type, and reduces the space occupation inside the hub; the planetary gear speed reducing mechanism is adopted for reducing speed, so that the axial magnetic field motor has the characteristics of high speed and low torque, the using amount of permanent magnets is greatly reduced, the magnetic pulling force is greatly reduced, and the cost of the motor is greatly reduced; the stator core of the independent module is adopted, the existing production conditions of high-efficiency punching and winding equipment are overcome, the existing mature high-speed continuous die punching process and the existing laser welding process are utilized to manufacture the stator core, the core and the groove sleeve can be made of the core material, the automation of coil winding is realized, and the recent cost of the hub motor is controlled at the level of the existing gear hub motor.
Therefore, the invention provides the following scheme:
the invention discloses a light electric bicycle motor with a gear hub, which comprises a main shaft, a hub, an end cover, a motor and a planetary gear reduction mechanism, wherein the motor drives the hub to rotate after being reduced by the planetary gear reduction mechanism; the stator assembly comprises a plurality of stator cores, a stator yoke disc and a stator frame, wherein the stator cores are formed by overlapping and connecting a plurality of silicon steel material sheets with different widths into a whole along the radial direction, at least one first mortise is arranged on two radial overlapped surfaces, perpendicular to the rotating surface of the rotor assembly, of one side, far away from the rotor assembly, of the stator cores, the stator yoke disc is formed by overlapping a plurality of silicon steel material disc sheets along the axial direction, a plurality of circumferentially arrayed second mortises are arranged on the stator yoke disc, the stator frame is provided with a radial tray, a first connecting hole is formed in the radial tray, or a third mortise corresponding to the second mortises is arranged on the radial tray; the stator core is located the solid part of first tongue-and-groove interval inserts the second tongue-and-groove with the third tongue-and-groove with the stator yoke dish with the stator frame forms mortise and tenon structure and connects, perhaps the stator core is located the solid part of first tongue-and-groove interval inserts the second tongue-and-tenon groove with the stator yoke dish becomes mortise and tenon structure and connects the back, the stator frame pass through first connecting hole with the stator yoke dish is connected, the stator frame with main shaft fixed connection.
Preferably, the stator assembly further comprises a coil sleeved on the stator core, and the coil and the stator core are insulated and isolated through an insulated coil framework or insulating materials coated on the stator core.
Preferably, the radial tray is arranged at one end, far away from the rotor disc, of the stator frame, the first mortise is a 'U' -shaped groove, the second mortise and the third mortise are open grooves, the entity part of the stator core between the first mortises is inserted into the second mortise and the third mortise from the openings, and the groove edges of the second mortise and the third mortise are clamped in the first mortise.
Preferably, the radial tray is arranged at one end of the stator frame close to the rotor disc, the stator yoke disc is further provided with a second connecting hole corresponding to the first connecting hole, the stator yoke disc is sleeved on the stator frame, and the stator yoke disc and the stator frame are riveted or bolted through the first connecting hole and the second connecting hole; the first tongue-and-groove is "U" shape groove, the second tongue-and-groove is the open slot, stator core the interval entity part of first tongue-and-groove inserts from the opening the second tongue-and-groove, the centre gripping has in the first tongue-and-groove the groove limit of second tongue-and-groove.
Preferably, the radial tray is arranged at one end of the stator frame close to the rotor disc, the stator yoke disc is further provided with a second connecting hole corresponding to the first connecting hole, the stator yoke disc is sleeved on the stator frame, and the stator yoke disc and the stator frame are riveted or bolted through the first connecting hole and the second connecting hole; the first mortise is an L-shaped slot, and the solid part of the first mortise interval of the stator core is inserted into the second mortise and then fixedly connected with the stator yoke disc through welding or riveting.
Preferably, the axial magnetic field hub motor with a single-rotor single-stator structure has the structure that the magnetic pulling force and the overturning force borne by the rotor disc are supported by the bearing unit, and the bearing unit is a double-row angular contact ball bearing, or a series combination of a deep groove ball bearing and a single-row angular contact ball bearing, or a series combination of two single-row angular contact ball bearings.
Preferably, the bearing unit is a series combination of a deep groove ball bearing and a single-row angular contact ball bearing, the single-row angular contact ball bearing is positioned on one side of the stator core, and the diameter of the outer ring of the single-row angular contact ball bearing is larger than that of the outer ring of the deep groove ball bearing, or the diameters of the outer rings of the deep groove ball bearing and the single-row angular contact ball bearing are the same, and a gasket is arranged between the outer rings of the two bearings.
Preferably, in the series combination of two single-row angular contact ball bearings, the two single-row angular contact ball bearings are arranged in the same direction, an elastic washer is arranged between inner rings of the two bearings, and the magnetic pulling force applied to the rotor disc is shared by the two single-row angular contact ball bearings through the elastic washer.
Preferably, the rotor disc and/or the stator yoke disc are provided with a vent, and cold air is introduced into the motor through the vent by an air pressure difference generated by rotation of the rotor disc, and hot air is discharged out of the motor.
Compared with the prior art, the invention has the following technical effects:
the invention applies the axial magnetic field motor, especially the axial magnetic field motor with single stator and single rotor structure to the hub motor of the electric bicycle, the permanent magnet consumption is reduced by 20 percent compared with the traditional radial magnetic field motor, the iron core material consumption is reduced by 40 percent, the high efficiency interval is advanced and the width is greatly increased, the continuous mileage of the electric bicycle is greatly improved, and the low-cost batch production can be carried out under the existing preparation technical conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a hub motor with gears for a light electric bicycle according to an embodiment;
FIG. 2 is a 3D exploded view of the geared hub motor of the light electric bicycle of the present embodiment;
FIG. 3 is a schematic view of the connection of a stator core, a stator yoke disc and a stator frame;
FIG. 4 is a schematic view of the connection of a stator core, an alternative stator yoke disk and an alternative stator frame;
FIG. 5 is a schematic view of a stator assembly of the electric machine;
FIG. 6 is a schematic view of a bearing unit;
FIG. 7 is another schematic structural view of the bearing unit;
FIG. 8 is another schematic structural view of the bearing unit;
fig. 9 is a power-efficiency curve diagram of a model 48V350W gear hub motor of the light electric bicycle.
Description of reference numerals: 1, a main shaft; 2, a hub; 3, end cover; 4a rotor disk; 5 a permanent magnet; 6 a stator core; 7 a stator yoke disk; 8, a stator frame; 9 pole shoes; 10 a first mortise; 12 rolling bodies; 13 air gap; 14 coils; 15 a coil bobbin; 16 a second mortise; 17 a radial tray; 18 a third mortise; 19 a first connection hole; 20 a second connection hole; 21 double row angular contact ball bearings; 22 deep groove ball bearings; 23 single-row angular contact ball bearings; 24 a gasket; 25 an elastic washer; 26, a vent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-8, the present embodiment provides a light electric bicycle with a gear hub motor, which includes a main shaft 1, a hub 2, an end cover 3, a motor and a planetary gear reduction mechanism, wherein the motor drives the hub 2 to rotate after being reduced by the planetary gear reduction mechanism; the motor is an axial magnetic field motor with a single-rotor single-stator fixed-shaft structure, and comprises a rotor assembly and a stator assembly, wherein the rotor assembly comprises a rotor disc 4 and a plurality of permanent magnets 5 arranged on the rotor disc 4, and the rotor disc 4 is rotationally connected with the main shaft 1 through a bearing unit which comprises an angular contact bearing and is provided with axially parallel rolling bodies 12; the stator assembly comprises a plurality of stator cores 6, a stator yoke disc 7 and a stator frame 8, wherein the stator cores 6 are a plurality of thin sheets of silicon steel materials with different widths, which are overlapped and welded into a whole along the radial direction, the welding surface of the stator cores at least comprises the end surface of one end far away from the rotor disc 4, as shown in figure 4, one end of the stator core 6 close to the rotor disc 4 is provided with a pole shoe 9, one side of the stator core 6 far away from the rotor disc 4 is at least provided with a first mortise 10 on two radial overlapped surfaces vertical to the rotating surface of the rotor disc 4, the stator yoke disc 7 is formed by overlapping a plurality of circular thin sheets of the silicon steel materials along the axial direction, the stator yoke disc 7 is provided with a plurality of second mortises 16 in a circumferential array, the stator frame 8 is provided with a radial tray 17, the radial tray 17 is provided with a first connecting hole 19, or the radial tray 17 is provided with a third mortise 18 corresponding to the, the stator assembly further comprises a coil 14 sleeved on the stator core 6, the axial height of the coil 14 is smaller than the axial length of the stator core 6, and the coil 14 and the stator core 6 are insulated and blocked through an insulated coil framework 15 or an insulating layer is coated on the stator core for insulation and blocking; the solid part of the stator core 6 located between the first mortise 10 is inserted into the second mortise 16 and the third mortise 18 to form mortise-tenon joint structure connection with the stator yoke disc 7 and the stator frame 8, or the solid part of the stator core 6 located between the first mortise 10 is inserted into the second mortise 16 to form mortise-tenon joint structure connection with the stator yoke disc 7, the stator yoke disc 7 is connected with the stator frame 8 through the first connection hole 19, and the stator frame 8 is fixedly connected with the main shaft 1.
According to the invention, the space in the hub is utilized compactly and reasonably, the hub motor has a stable structure with the characteristic of a through shaft, and the disc type rotor disc 4 has a special pumping effect, so that circulating airflow can be generated in the space of the hub, and the cooling of the motor is facilitated.
The axial magnetic field motor needs to overcome the axial magnetic pulling force between the rotor assembly and the stator assembly, and also needs to overcome the overturning force generated by the axial magnetic pulling force because the axial magnetic pulling force is not theoretically uniform in the circumferential direction. The rated power of the hub motor is less than 400W, and the axial magnetic field motor has the characteristics of high speed and low torque due to the speed reduction of the planetary gear speed reducing mechanism, the magnetic pulling force is limited and controllable, and the technical scheme that the rotor disc 4 is rotationally connected to the main shaft 1 by the bearing unit of the angular contact ball bearing and the two parallel rolling bodies 12' is proved by experiments; in this embodiment, a plurality of stator cores 6 are arranged coaxially and circumferentially to form an annular magnetic pole plane composed of a plurality of stator core magnetic poles, and the annular magnetic pole plane corresponds to the magnetic pole surfaces of a plurality of permanent magnets 5, and the permanent magnet flux thereof passes through "N pole to air gap 13 of permanent magnet 5, stator core 6 to stator yoke disk 7, adjacent stator core 6 to air gap 13, and S pole of adjacent permanent magnet 5" to form a closed magnetic circuit.
The stator assembly is characterized in that the stator assembly is connected in a mortise and tenon structure, the solid part between the first mortise 10 of the stator core 6 is a tenon in the mortise and tenon structure, the groove side surface of the first mortise 10 is an axially positioned tenon shoulder of the stator core 6, and the coil 14 is sleeved between the pole shoe 9 and the first mortise 10.
Those skilled in the art should adopt appropriate structural forms to ensure the reliability of the stator assembly according to the magnitude of the magnetic pulling force and the electromagnetic torque of the axial magnetic field motor, and the structural forms of the stator core 6, the stator yoke disk 7 and the stator frame 8 and the connection modes among the three, which can be selected according to the following three embodiments of the present embodiment but are not limited to these three embodiments.
The first embodiment is as follows:
first tongue-and-groove 10 is stator core 6 in "U" shape groove, and is connected with the stator frame 8 that has cup jointed stator yoke dish 7 with the mortise and tenon joint structure:
as shown in fig. 3, the radial pallet 17 is disposed at an end of the stator frame 8 away from the rotor disc 4, the first mortise 10 is a "U" shaped slot, both the second mortise 16 and the third mortise 18 are open slots, the slot shapes of the second mortise 16 and the third mortise 18 correspond to the solid portion of the first mortise 10, the slot width of the first mortise 10 is consistent with the sum of the axial lengths of the stator yoke disc 7 and the stator frame 8, the solid portion of the first mortise 10 of the stator core 6 is inserted into the second mortise 16 and the third mortise 18 from the open slots, and the slot edges of the second mortise 16 and the third mortise 18 are clamped in the first mortise 10.
In this embodiment, the magnetic pulling force and the electromagnetic torque of the motor are directly applied to the stator frame 8 by the stator core 6, and the stator yoke disc 7 can be axially stacked in the most economical way.
Example two:
the stator core 6 with the U-shaped slot in the first mortise 10 is connected with the stator yoke disc 7 by a mortise-tenon structure:
as shown in fig. 4, the radial tray 17 is disposed at one end of the stator frame 8 close to the rotor disc 4, the near-axis side of the stator yoke disc 7 is further provided with a second connection hole 20 corresponding to the first connection hole 19, and the stator yoke disc 7 and the stator frame 8 are riveted or bolted through the first connection hole 19 and the second connection hole 20; the first mortise 10 is a U-shaped groove, the second mortise 16 is an open groove, the groove shape of the second mortise 16 of the stator yoke disc 7 is corresponding consistent with the solid part between the first mortise 10, the groove width of the first mortise 10 is consistent with the axial length of the stator yoke disc 7, the stator yoke disc 7 is sleeved on the stator frame 8, the solid part between the first mortise 10 of the stator core 6 sleeved with the coil 14 is inserted into the second mortise 16 from the open position, and the groove edge of the second mortise 16 is clamped in the first mortise 10.
In this embodiment, the magnetic pulling force and the electromagnetic torque of the motor are transmitted from the stator yoke disk 7 to the stator frame 8, and for this purpose, the number of laminated stator yoke disks can be increased appropriately to increase the strength thereof.
Example three:
the stator core 6 with the first mortise 10 as the L-shaped slot is connected with the stator yoke disc 7 by a mortise-tenon structure:
the radial tray 17 is arranged at one end of the stator frame 8 close to the rotor disc 4, the first mortise 10 is an L-shaped slot, the near-axis side of the stator yoke disc 7 is also provided with a second connecting hole 20 corresponding to the first connecting hole 19, and a solid part between the first mortises 10 of the stator core 6 is inserted into the second mortises 16 and then fixed with the stator yoke disc 7 by welding.
The specific form of the bearing unit can be selected by those skilled in the art according to actual needs, as long as the bearing unit comprises an angular contact ball bearing capable of bearing axial magnetic pull force, and the bearing unit has axially juxtaposed rolling bodies 12 bearing overturning moment. For example, the bearing unit may be a double row angular contact ball bearing 21, as shown in fig. 7; or a series combination of a deep groove ball bearing 22 and a single row angular contact ball bearing 23, as shown in fig. 1 and 6; or a series combination of two single row angular contact ball bearings 23 as shown in fig. 8.
In the series combination of the deep groove ball bearing 22 and the single-row angular contact ball bearing 23, the single-row angular contact ball bearing 23 is positioned on one side of the stator core 6, the diameter of the outer ring of the single-row angular contact ball bearing 23 is larger than that of the outer ring of the deep groove ball bearing 22, and magnetic pulling force acts on a bearing stop of the single-row angular contact ball bearing 23, as shown in fig. 6; the deep groove ball bearing 22 and the single-row angular contact ball bearing 23 have the same outer ring diameter, a gasket 24 is arranged between the outer rings, and magnetic pulling force is transmitted to a bearing stop of the deep groove ball bearing 22 through the gasket 24.
When the magnetic tension is large, the bearing unit selects the series combination of the two single-row angular contact ball bearings 23, the two single-row angular contact ball bearings 23 are arranged in the same direction, and the elastic washer 25 is arranged between the inner rings of the two single-row angular contact ball bearings 23, as shown in fig. 8, the elastic washer 25 adopts a waveform lamination, and the magnetic tension causes the elastic washer 25 to generate compression deformation and be shared by the two single-row angular contact ball bearings 23; when the diameters of the outer rings of the two single-row angular contact ball bearings 23 are different, magnetic pull force acts on the bearing stops of the two single-row angular contact ball bearings 23 respectively, and when the diameters of the outer rings of the two single-row angular contact ball bearings 23 are the same, a gasket 24 is arranged between the outer rings of the two single-row angular contact ball bearings.
The rotor disc 4 and/or the stator yoke disc 7 of the present embodiment are provided with the ventilation opening 25, because the rotor disc 4 and the stator core 6 rotate relatively, the air in the air gap 13 is driven to flow along with the rotor disc 4, the flow rate of the air at the edge of the rotor disc 4 is greater than that of the air at the inner side, so that the outer side air pressure is less than the inner side air pressure, a "pumping effect" is formed, the cold air enters the air gap 13 from the ventilation opening 25, and the hot air is discharged from the motor, thereby improving the heat.
As shown in figure 2, the geared hub motor prototype with the structure of the embodiment is designed to have a rated voltage of 48V and a rated power of 350W, an axial magnetic field motor no-load rotation speed of 1988rpm/min and a hub 2 no-load rotation speed of 280rpm/min, the axial magnetic field direct current motor is in a 12-slot 16-pole fractional-slot synchronous direct current motor type, and the inner diameter and the outer diameter of an axial magnetic field stator core consisting of a stator core 7 and a stator yoke disc 9 are respectively equal to
And
by using
The number of the parallel branches of the concentrated winding is 4, and the magnetic pole position sensor is a Hall position sensor.
The test result of the prototype is shown in figure 9, the maximum efficiency is close to 86%, the efficiency in the power range of 125W-515W is more than 80%, and the efficiency curve chart shows that the invention is particularly suitable for light electric bicycles with low power. The bicycle running test of a 20-inch 1.75-inch wide tire sample uses a 48V14Ah lithium battery as a power source, and the continuous mileage reaches 95Km according to the average speed per hour of 24Km/h on a flat road surface of wind three to four grades, which is improved by nearly 50 percent compared with the electric bicycle which is arranged on the market and adopts a radial magnetic field geared hub motor, thereby realizing the purpose of the invention.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, the specific embodiment and the application range may be changed, and the light electric bicycle with the geared hub motor of the present invention can also be realized. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The utility model provides a light-duty electric bicycle has gear hub motor, includes main shaft, wheel hub, end cover, motor and planetary gear reduction gears, the motor passes through drive after planetary gear reduction gears slows down wheel hub rotates characterized by: the motor is an axial magnetic field motor with a single-rotor single-stator fixed-shaft structure, and comprises a rotor assembly and a stator assembly, wherein the rotor assembly comprises a rotor disc and a plurality of permanent magnets arranged on the rotor disc, and the rotor disc is rotationally connected with the main shaft through a bearing unit which comprises an angular contact bearing and is provided with axially parallel rolling bodies; the stator assembly comprises a plurality of stator cores, a stator yoke disc and a stator frame, wherein the stator cores are formed by overlapping and connecting a plurality of silicon steel material sheets with different widths into a whole along the radial direction, at least one first mortise is arranged on two radial overlapped surfaces, perpendicular to the rotating surface of the rotor assembly, of one side, far away from the rotor assembly, of the stator cores, the stator yoke disc is formed by overlapping a plurality of silicon steel material disc sheets along the axial direction, a plurality of circumferentially arrayed second mortises are arranged on the stator yoke disc, the stator frame is provided with a radial tray, a first connecting hole is formed in the radial tray, or a third mortise corresponding to the second mortises is arranged on the radial tray; the stator core is located the solid part of first tongue-and-groove interval inserts the second tongue-and-groove with the third tongue-and-groove with the stator yoke dish with the stator frame forms mortise and tenon structure and connects, perhaps the stator core is located the solid part of first tongue-and-groove interval inserts the second tongue-and-tenon groove with the stator yoke dish becomes mortise and tenon structure and connects the back, the stator frame pass through first connecting hole with the stator yoke dish is connected, the stator frame with main shaft fixed connection.
2. The lightweight electric bicycle hub motor of claim 1, wherein the stator assembly further comprises a coil disposed around the stator core, and the coil and the stator core are insulated by an insulating coil frame or an insulating coating.
3. The lightweight electric bicycle geared hub motor of claim 1, wherein the radial tray is disposed at an end of the stator frame away from the rotor disc, the first mortise is a "U" shaped slot, the second and third mortises are open slots, the solid portion of the stator core between the first mortises is inserted into the second and third mortises from the opening, and the slot edges of the second and third mortises are clamped in the first mortise.
4. The lightweight electric bicycle geared hub motor of claim 1, wherein the radial tray is disposed at an end of the stator frame near the rotor disc, the stator yoke disc is provided with a second coupling hole corresponding to the first coupling hole, and the stator yoke disc and the stator frame are riveted or bolted through the first coupling hole and the second coupling hole; the first tongue-and-groove is "U" shape groove, the second tongue-and-groove is the open slot, stator core the interval entity part of first tongue-and-groove inserts from the opening the second tongue-and-groove, the centre gripping has in the first tongue-and-groove the groove limit of second tongue-and-groove.
5. The lightweight electric bicycle geared hub motor of claim 1, wherein the radial tray is disposed at an end of the stator frame near the rotor disc, the stator yoke disc is further provided with a second coupling hole corresponding to the first coupling hole, and the stator yoke disc and the stator frame are riveted or bolted through the first coupling hole and the second coupling hole; the first mortise is an L-shaped slot, and the solid part of the first mortise interval of the stator core is inserted into the second mortise and then fixedly connected with the stator yoke disc through welding or riveting.
6. The light-duty electric bicycle geared hub motor of claim 1, wherein the bearing unit is a double row angular contact ball bearing, or a series combination of a deep groove ball bearing and a single row angular contact ball bearing, or a series combination of two single row angular contact ball bearings.
7. The lightweight electric bicycle hub motor of claim 6, wherein the bearing unit is a series combination of a deep groove ball bearing and a single row angular contact ball bearing, the single row angular contact ball bearing being located on the stator core side and having an outer ring diameter larger than that of the deep groove ball bearing, or the deep groove ball bearing and the single row angular contact ball bearing having the same outer ring diameter and a washer disposed between the outer rings of the two bearings.
8. The light electric bicycle geared hub motor of claim 6, wherein the bearing unit is a series combination of two single-row angular contact ball bearings, the two single-row angular contact ball bearings are arranged in the same direction, an elastic washer is disposed between inner rings of the two bearings, and a magnetic pulling force applied to the rotor disc is shared by the two single-row angular contact ball bearings through the elastic washer.
9. The lightweight electric bicycle motor with gear hub of claim 1, wherein the rotor disc and/or the stator yoke disc is provided with a ventilation opening, and cold air is introduced into the motor through the ventilation opening by an air pressure difference generated by the rotation of the rotor disc, and hot air is discharged out of the motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020211302383 | 2020-06-18 | ||
| CN202021130238 | 2020-06-18 |
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| CN212627618U true CN212627618U (en) | 2021-02-26 |
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| CN202021384268.7U Active CN212627618U (en) | 2020-06-18 | 2020-07-15 | Light electric bicycle has geared hub motor |
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| CN (1) | CN212627618U (en) |
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