CN217935343U

CN217935343U - Hub type inner rotor motor

Info

Publication number: CN217935343U
Application number: CN202221694242.1U
Authority: CN
Inventors: 钱林弟
Original assignee: Suzhou Tongsheng New Energy Technology Co ltd
Current assignee: Suzhou Tongsheng New Energy Technology Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-11-29
Anticipated expiration: 2032-07-01

Abstract

The utility model discloses a hub type inner rotor motor, which comprises a hub shell, an inner rotor motor, a motor shaft and a planetary gear set, wherein the inner rotor motor drives the planetary gear set to rotate so as to drive the whole hub shell to rotate; the inner rotor motor is including the annular stator towards the piece that is located the outside and the rotor that is located annular stator towards the piece center, and the motor shaft has been run through at the middle part at the rotor gear place of rotor to the rotation through the motor shaft drives rotor gear's rotation in step, and rotor gear's tip extends and forms the external tooth structure to the middle part, through the switching of clutch subassembly to the motor shaft, realizes that the motor shaft switches for the drive mode of wheel hub shell. Compared with an outer rotor motor, the outer rotor is replaced by the inner rotor in a limited space, the overall production cost of the motor can be reduced by reducing the material ratio of the magnetic steel, and the motor has a strong market in the field of motors with low requirements on torque.

Description

Hub type inner rotor motor

Technical Field

The utility model belongs to the technical field of the motor, concretely relates to wheel hub type inner rotor motor.

Background

The hub type motor is used as an important component of a power system and a transmission system of the electric bicycle, and an outer rotor motor hub is generally adopted.

Because of the design structure of the outer rotor motor, the outer side of the outer rotor motor is a circular rotor, and the inner side of the outer rotor motor is a stator of an excitation coil, the outer rotor motor structure can be applied to the scene of low speed and large torque.

However, the annular magnetic steel structure arranged in the peripheral direction of the outer rotor can generate increased torque, and the used magnetic steel amount is large, so that the design cost in design can be greatly increased, the magnetic steel of the outer rotor is positioned at the outer side, and the outer rotor motor can be installed at the position where other components are compressed in the position where the size is limited, so that the improvement of output torque is limited, and the overall power can be influenced.

The utility model discloses an outer rotor motor stator towards piece, outer rotor motor stator, motor and fan in chinese patent CN201420400308.0, in the device, its stator towards piece adopts the design of single groove winding, avoid the design of sharing the groove, there is great help to line fall technology and automatic realization, at a pair of first single groove, second single groove design center has independent first tooth portion, the second tooth portion, multiplicable magnetic field return circuit, promote the magnetic field degree of consistency, reduce the magnetic leakage loss, promote effective magnetic induction area, increase the magnetic flux, output capacity promotes, promote the motor efficiency, but in the increase magnetic flux, the external diameter of the magnet steel stator that is located the outside must increase, and then receive the influence to the restriction of size, the data that increase the magnet steel stator simultaneously also greatly increased the input of equipment cost.

SUMMERY OF THE UTILITY MODEL

To the deficiency of the prior art, an object of the utility model is to provide a wheel hub type inner rotor motor has solved the above-mentioned technical problem who exists among the prior art.

The purpose of the utility model can be realized by the following technical scheme:

a hub type inner rotor motor comprises a hub shell, an inner rotor motor, a motor shaft and a planetary gear set, wherein the inner rotor motor and the planetary gear set are positioned on the inner side of the hub shell, and the inner rotor motor drives the planetary gear set to rotate so as to drive the hub shell to integrally rotate;

the inner rotor motor comprises an annular stator punching sheet positioned on the outer side and a rotor positioned in the center of the annular stator punching sheet, the rotor consists of a rotor gear and magnetic steel sheets, the magnetic steel sheets are fixedly distributed on the outer side of the rotor gear at equal intervals, a motor shaft penetrates through the middle of the rotor gear, the motor shaft synchronously drives the rotor gear to rotate, and the end part of the rotor gear extends to the middle to form an external tooth structure;

planetary gear set includes master gear, steel gear, gear shaft, the external tooth at rotor gear place drives in step rather than intermeshing's master gear rotation, the gear shaft sets up in the middle part position at master gear place with one heart and rotates along with master gear synchronous, the preceding tip at gear shaft place and steel gear intermeshing and the synchronous revolution that drives steel gear, simultaneously steel gear is fixed with the card end cover that flies, makes card end cover and wheel hub shell form the parcel wholly, and the rotation of following steel gear is along with the whole rotation of synchronous motion wheel hub shell.

Furthermore, a clutch assembly is arranged on the outer side of the card flying end cover, and the clutch assembly is synchronously sleeved at the position of the extending end part of the motor shaft; through the switching of clutch assembly to the motor shaft, realize the drive mode switching of motor shaft for the wheel hub shell.

Furthermore, the outer teeth where the rotor gear is located and the outer ring are arranged concentrically, an integrally formed structure is adopted, notches are formed in the periphery where the outer ring is located at equal intervals by taking the central shaft as the center, and the magnetic steel sheets are embedded into the positions where the notches are located.

Furthermore, the end part where the magnetic steel sheet is located extends out of the end face where the notch is located by 1-3mm.

Further, a Hall element sensor is arranged between two adjacent pairs of magnetic steel sheets.

Further, the main gear is a nylon gear.

Furthermore, the external teeth where the main gear and the rotor gear are located are meshed with each other in a helical tooth mode.

Furthermore, the gear shaft is concentrically arranged at the central position of the main gear through a first one-way bearing, and when the inner rotor motor is driven, the gear shaft on the main gear is driven to transmit in one direction through the rotor gear; when the motor shaft is driven manually, the rotation direction of the motor shaft is changed, and simultaneously, the rotor gear on the motor shaft directly acts on the card flying end cover and synchronously drives.

Furthermore, the joint where the rotor gear and the clutch assembly are located is connected by a second one-way bearing.

The utility model has the advantages that:

1. the device is characterized in that an inner rotor motor is adopted to drive a hub to integrally rotate in a limited space, a motor shaft is in a through shaft type arrangement with two end portions penetrating through, compared with a half shaft type output mode, the two end portions are uniformly stressed, meanwhile, a reduction gear instead of a planetary reduction mode is adopted, the arrangement of a bias mode can improve the service life of the whole device, the stability is better, and the output torque is favorably improved.

2. The first one-way bearing on the main gear of the device is matched with the second one-way bearing on the clutch assembly for use, so that the modes of electric drive and manual drive can be switched freely, two drive modes are not influenced mutually, and the operability is high.

3. The main gear adopted by the device is a nylon gear, the wear resistance of the nylon gear and the rotor gear can be improved when the nylon gear and the rotor gear are in meshing transmission, the generation of mechanical noise can be reduced, meanwhile, the structure is compact by the installation mode of the bevel gear of the main gear, the limited space can be saved when the same transmission ratio is generated, the integral meshing performance of the main gear can be improved, the bearing capacity is improved, the saw teeth are in full contact and stress dispersion when in meshing, and the use fatigue resistance of the gear is prolonged.

4. The Hall element sensor on the device is arranged at a gap position between two adjacent groups of magnetic steel sheets, so that the Hall element sensor can be conveniently installed, detached and replaced, the phenomenon that the Hall element sensor is installed on an external stator to influence the overall installation of the Hall element sensor is reduced, and the Hall element sensor is not influenced by the number of stator slots during installation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic view of the overall internal structure of an embodiment of the present invention;

fig. 2 is a schematic sectional structure diagram of an embodiment of the present invention;

fig. 3 is a schematic view of a portion of an inner rotor motor according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a rotor gear according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a planetary gear set embodying the present invention;

fig. 6 is a schematic structural view of the integral external hub according to the embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the embodiment of the utility model provides a hub type inner rotor motor, including wheel hub shell 1, inner rotor motor 2, motor shaft 3, planetary gear set 4 and clutch assembly 5, wherein inner rotor motor 2, planetary gear set 4 are located wheel hub shell 1 inboard to fly end cover 11 through the card and wrap up its whole wherein, inner rotor motor 2 is through the rotation that drives planetary gear set 4 simultaneously, thereby drives the whole rotation of wheel hub shell 1. Be located the outside at card flying end lid 11 place and be provided with clutch pack 5, clutch pack 5 synchronous cover locates the tip position that motor shaft 3 stretches out, through clutch pack 5 to motor shaft 3's switching, realizes that motor shaft 3 switches for the driving method of wheel hub shell 1, and then changes wheel hub shell 1 and adopt motor drive or the change of manpower drive.

As shown in fig. 3 and 4, the inner rotor motor 2 includes the annular stator punching 21 located at the outer side, and the rotor 22 located at the center of the annular stator punching 21, the rotor 22 is composed of a rotor gear 221 and magnetic steel sheets 222, the outer teeth at the position of the rotor gear 221 and the outer ring are concentrically arranged, and an integrated structure is adopted, the periphery at the position of the outer ring uses the central shaft as the center to equally space the notches 201, the magnetic steel sheets 222 are embedded in the positions of the notches 201, at the moment, the end portions at the positions of the magnetic steel sheets 222 outwards extend out of the end faces at the positions of the notches 201 by 1-3mm, gaps can be generated between two adjacent sets of the magnetic steel sheets 222 due to the arrangement, and the hall element sensors 202 are embedded in the two sets of the magnetic steel sheets 222.

The Hall piece of general inner rotor motor all puts the punching sheet inslot of peripheral survey, and comparatively stable the placing during this kind of design avoids droing, once the punching sheet groove too intensive can influence the installation of Hall position (because adjacent stator inslot can twine the turn line, twine the turn line too intensive, can extrude the installation of Hall position). This kind of hall element sensor 202 puts in magnetic steel piece 222 inboardly in this application, and does not place and be located outside stator slot, can not receive the slot number influence (comparatively intensive region is interior and not drop easily), even if the slot number is comparatively intensive also do not influence, can customize hall element sensor 202's specific mounted position as required, and convenient the change, and traditional hall position can be with the winding of the circle line on the annular stator punching piece 21, dismantle the maintenance can need wholly change it, take trouble and laboursome, do not influence the installation and change.

Meanwhile, the middle of the rotor gear 221 penetrates through the motor shaft 3, the rotor gear 221 is synchronously driven to rotate through the rotation of the motor shaft 3, and the end of the rotor gear 221 extends towards the middle to form an external tooth structure.

As shown in fig. 5, the planetary gear set 4 includes a main gear 41 (the main gear 41 is a nylon gear, which reduces the generation of gear noise during meshing transmission and improves the overall wear resistance), a steel gear 42, a gear shaft 43, the external teeth of the rotor gear 221 synchronously drive the main gear 41 meshed therewith to rotate (which can be meshed with each other in a skewed tooth manner, and has a compact structure, and can save limited space while improving the overall meshing performance and bearing capacity when generating the same transmission ratio, and the teeth are sufficiently contacted and stressed to be dispersed during meshing, so as to prolong the fatigue resistance of the gears in use), the gear shaft 43 is concentrically disposed at the middle position of the main gear 41 and synchronously rotates with the main gear 41, the front end of the gear shaft 43 is meshed with the steel gear 42 and drives the steel gear 42 to synchronously rotate (which can be meshed with each other in a skewed tooth manner), the steel gear 42 is fixed to the card flying end cover 11 (fixed by bolts at the back to improve the firmness and facilitate the disassembly and maintenance and installation), so that the card flying end cover 11 and the hub shell 1 integrally rotate with the steel gear 1.

When the clutch assembly is used, the gear shaft 43 is concentrically arranged at the central position of the main gear 41 through the first one-way bearing 401, when the inner rotor motor 2 is driven, the rotor gear 221 drives the gear shaft 43 on the main gear 41 to transmit in one direction (at this time, the transmission of the main gear 41 can synchronously drive the gear shaft 43, so that the steel gear 42 meshed with the gear shaft 43 rotates), and the second one-way bearing 111 at the joint of the rotor gear 221 and the clutch assembly 5 is in non-transmission connection, so that the rotation of the rotor gear 221 does not drive the flying end cover 11 connected with the rotor gear to transmit. When the transmission mode of the clutch assembly 5 is changed, that is, the motor shaft 3 is driven by manpower and foot, the rotation direction of the motor shaft 3 is changed, the rotor gear 221 on the motor shaft 3 directly acts on the card flying end cover 11 through the second one-way bearing 111, and synchronous transmission is realized, and at this time, after the rotor gear 221 drives the main gear 41 to rotate, the rotation of the steel gear 42 is not driven again because the first one-way bearing 401 is in one-way transmission.

As shown in fig. 6, for the overall structure schematic diagram, compared with an outer rotor motor, the outer rotor motor has the advantages that the outer rotor is replaced by the inner rotor in a limited space, the overall production cost of the motor can be reduced by reducing the material ratio of the magnetic steel, meanwhile, the reduction gear is adopted instead of a planetary reduction mode, the offset mode is arranged, the overall service life of the motor can be prolonged, and the motor has a strong market in the field of motors with low requirements on torque.

The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A hub type inner rotor motor comprises a hub shell (1), an inner rotor motor (2), a motor shaft (3) and a planetary gear set (4), and is characterized in that the inner rotor motor (2) and the planetary gear set (4) are located on the inner side of the hub shell (1), and the inner rotor motor (2) drives the planetary gear set (4) to rotate so as to drive the hub shell (1) to integrally rotate;

the inner rotor motor (2) comprises an annular stator punching sheet (21) positioned on the outer side and a rotor (22) positioned at the center of the annular stator punching sheet (21), wherein the rotor (22) consists of a rotor gear (221) and magnetic steel sheets (222), the magnetic steel sheets (222) are fixedly distributed on the outer side of the rotor gear (221) at equal intervals, a motor shaft (3) penetrates through the middle of the rotor gear (221), the rotor gear (221) is synchronously driven to rotate through the rotation of the motor shaft (3), and the end part of the rotor gear (221) extends to the middle to form an external tooth structure;

planetary gear set (4) include master gear (41), steel gear (42), gear shaft (43), the external tooth synchronous drive at rotor gear (221) place rotates rather than intermeshing's master gear (41), gear shaft (43) set up in the middle part position at master gear (41) place with one heart and along with master gear (41) synchronous revolution, the preceding tip at gear shaft (43) place and steel gear (42) intermeshing and the synchronous revolution that drives steel gear (42), simultaneously steel gear (42) are fixed with card flying end lid (11), make card flying end lid (11) and wheel hub shell (1) form the parcel wholly, along with the rotation of steel gear (42) the whole rotation of synchronous motion wheel hub shell (1).

2. The hub type inner rotor motor according to claim 1, wherein a clutch assembly (5) is disposed at an outer side of the free end cover (11), and the clutch assembly (5) is synchronously sleeved at an end position where the motor shaft (3) extends; the driving mode switching of the motor shaft (3) relative to the hub shell (1) is realized through the switching of the clutch component (5) to the motor shaft (3).

3. The hub type inner rotor motor according to claim 1, wherein the outer teeth of the rotor gear (221) are concentric with the outer ring, and are formed as an integral structure, and the outer circumference of the outer ring has notches (201) at equal intervals around the central axis, and the magnetic steel sheet (222) is embedded in the notches (201).

4. A hub type inner rotor motor according to claim 3, wherein the end of the magnetic steel sheet (222) is extended out of the end face of the notch (201) by 1-3mm.

5. The hub type inner rotor motor according to claim 4, wherein a Hall element sensor (202) is disposed between two adjacent pairs of the magnetic steel sheets (222).

6. A hub inner rotor motor according to claim 1, wherein the main gear (41) is a nylon gear.

7. A hub inner rotor motor according to claim 6, wherein the outer teeth of the main gear (41) and the rotor gear (221) are in helical engagement with each other.

8. A hub type inner rotor motor according to claim 1, wherein the gear shaft (43) is concentrically arranged at the center position of the main gear (41) through a first one-way bearing (401), and when the inner rotor motor (2) is driven, the gear shaft (43) on the main gear (41) is driven to transmit in one direction through the rotor gear (221); when the motor shaft (3) is driven by manpower, the rotation direction of the motor shaft (3) is changed, and simultaneously, a rotor gear (221) on the motor shaft (3) directly acts on the card flying end cover (11) and is synchronously driven.

9. A hub inner rotor motor according to claim 8, wherein the connection of the rotor gear (221) and the clutch assembly (5) is by a second one-way bearing (111).