CN219295620U

CN219295620U - Middle motor using flexible speed reducer

Info

Publication number: CN219295620U
Application number: CN202320316203.6U
Authority: CN
Inventors: 陈栋; 蔡宪文; 张伟; 秦小虎; 胡明; 陆健
Original assignee: JIANGSU CHANNELON ELECTRONIC GROUP CO Ltd
Current assignee: JIANGSU CHANNELON ELECTRONIC GROUP CO Ltd
Priority date: 2023-02-25
Filing date: 2023-02-25
Publication date: 2023-07-04
Anticipated expiration: 2033-02-25

Abstract

The utility model relates to the technical field of electric bicycles, in particular to a centrally-mounted motor using a flexible speed reducer, which comprises a center shaft and a torque sensor module, wherein a flying core II is arranged on the outer side of the center shaft, a stator assembly is arranged on one side of the torque sensor module, a rotor is arranged on the outer side of the stator assembly, the other end of the rotor is connected with a driving wave exciter through a spline, a flexible rotating wheel is arranged on the outer side of the driving wave exciter, a rigid fixed wheel is arranged on the outer side of the flexible rotating wheel, a one-way bearing is connected with the other end of the flexible rotating wheel, and the flexible rotating wheel is connected with a core wheel through the one-way bearing. The utility model discloses a flexible reduction gear core component comprises three major components of drive ripples exciter, rigidity fixed pulley and flexible runner, and both ends or three terminal alternate interlock are adopted to the tooth of rigidity fixed pulley and flexible runner, need not ordinary multistage gear reduction mechanism and need install a plurality of bearings and guarantee axial pivoted concentricity and runout, only need connect with the bearing as output rigidity fixed pulley to ensure that the output is steady.

Description

Middle motor using flexible speed reducer

Technical Field

The utility model relates to the technical field of electric bicycles, in particular to a centrally-mounted motor using a flexible speed reducer.

Background

In the field of electric power-assisted bicycle, the central motor is a motor which is arranged in the middle position of a bicycle body, namely in the pedal position, of the driving motor of the electric power-assisted bicycle, the motor is connected with the bicycle body and is connected with a rear wheel through a chain to transmit power, meanwhile, pedals are arranged on two sides of the motor, and under the condition that the motor has no power supply, a rider can realize the manual riding of the bicycle through the pedals.

The self-adaptive flexible transmission device of the harmonic reducer with the publication number of CN211975810U comprises a flexible gear and a motor, wherein a wave generator is arranged in the flexible gear, a sliding sleeve is arranged in an end face flange of the flexible gear, a floating seat is arranged in the sliding sleeve, a ball head is arranged on the floating seat, an elastic piece for applying force to the floating seat towards the wave generator is arranged on one side of the floating seat, a floating table coaxial with the rotation center of the wave generator is arranged on one side of the wave generator, a floating groove matched with the ball head is arranged on the floating table, a strip-shaped boss is arranged on one side of the wave generator, a transmission disc is fixed on an output shaft of the motor, a floating disc is arranged between the transmission disc and the wave generator, a groove is arranged on one side of the transmission disc, a strip-shaped groove and a convex strip are respectively arranged on two sides of the floating disc, and the strip-shaped grooves and the convex strips are crossed and mutually perpendicular, are respectively arranged in the strip-shaped grooves and the groove, and are in clearance fit.

In summary, the following technical problems exist in the prior art: the traditional central motor generally adopts a multi-stage gear reduction mechanism or a planetary reduction mechanism, the reduction mechanism is large in size and difficult to make a large-speed-ratio design, is limited by the reduction mechanism, is mostly in an irregular three-dimensional pattern, is large in size and small in speed ratio, and the transmitted torque is mostly unable to be increased due to the limitation of the speed ratio, so that the problems that the traditional central motor reduction mechanism is complex in structure, quite high in cost and large in assembly and debugging difficulty are solved, and therefore, the central motor using the flexible speed reducer is provided.

Disclosure of Invention

The utility model aims to provide a centrally-mounted motor using a flexible speed reducer, which aims to solve the problems that the traditional centrally-mounted motor speed reducing mechanism is complex in structure, quite high in cost and relatively high in assembly and debugging difficulty in the background technology.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides an use flexible reduction gear's centrally-mounted motor, includes axis and moment sensor module, the centraxonial outside is equipped with flies the core two, fly the outside of core two and install the ratchet ring, fly one side of core two and be equipped with the deformation piece, the laminating of the outside of deformation piece has the foil gage, moment sensor module is installed to one side of foil gage, stator module's one side is installed the stator module, the rotor is installed in stator module's outside, the other end of rotor has the drive wave exciter through spline connection, flexible runner is installed in the outside of drive wave exciter, rigid fixed wheel is installed in the outside of flexible runner, the other end of flexible runner is connected with one-way bearing, and flexible runner is connected with the core through one-way bearing, the outside of core is equipped with flies the core one.

Preferably, the rigid fixed wheel is a fixed body, the motor housing III is fixed on the outer side of the rigid fixed wheel, the rigid fixed wheel is made of hard steel, the surface wear-resistant strengthening treatment is performed, the inner ring is toothed, the flexible rotating wheel is made of flexible steel, the outer ring is toothed, the outer ring of the flexible rotating wheel is meshed with the inner ring of the rigid fixed wheel, the driving wave exciter is made of hard alloy steel, the surface wear-resistant strengthening treatment is performed, the flexible rotating wheel rotates along the rigid fixed wheel through the driving wave exciter and the rotor, and two ends, three sections or multiple ends of teeth are meshed between the flexible rotating wheel and the rigid fixed wheel.

Preferably, the driving wave exciter and the rotor form an integrated structure through a spline, and the flexible rotating wheel and the unidirectional bearing form an integrated structure.

Preferably, the motor housing III is connected with the rotor through a common bearing, one side of the motor housing III is connected with the motor housing I, and the other side of the motor housing III is connected with the motor housing II.

The above description shows that, by the above technical solution of the present application, the technical problem to be solved by the present application can be necessarily solved.

Meanwhile, through the technical scheme, the utility model has at least the following beneficial effects:

compared with the common multi-stage gear reduction mechanism, the utility model has the advantages that the number of gears is large, the meshing stages are large, the manufacturing cost is high, the debugging is difficult, and the concentricity and the runout degree of axial rotation can be ensured only by installing bearings at each stage and even at the two ends of each gear.

Compared with the common multi-stage gear reduction mechanism, the flexible speed reducer has more engagement stages, the more the engagement stages are, the larger the noise is, and the noise can be greatly reduced by the primary engagement; and the flexible rotating wheel is elastic, and compared with the common multi-stage gear reduction mechanism, each stage is in rigid engagement, so that the engagement noise can be greatly reduced.

The utility model is easy to make large speed ratio transmission, and one of the speed ratio calculation formulas of the common multi-stage gear reduction mechanism is as follows: ntotal=nslave/nmaster (nmaster: number of teeth of the driving end gear, nslave: number of teeth of the driven end gear); compared with the common multi-stage gear reduction mechanism, the flexible speed reducer Ntotal=N2/(N1-N2) speed ratio calculation is easier to make a large speed ratio.

Drawings

FIG. 1 is a schematic diagram of the internal structure of a central motor according to the present utility model;

FIG. 2 is a schematic diagram of the engagement structure of two ends of a flexible rotating wheel and a rigid fixed wheel;

FIG. 3 is a schematic diagram of a three-end engagement structure of a flexible rotating wheel and a rigid fixed wheel.

In the figure: 1. a first flying core; 2. a core wheel; 3. a center shaft; 4. ratchet ring; 5. a second flying core; 6. a deformation block; 7. a strain gage; 8. a torque sensor module; 9. a stator assembly; 10. a rotor; 11. a common bearing; 12. a driving wave exciter; 13. a flexible wheel; 14. rigid fixed wheels; 15. a one-way bearing; 16. a first motor housing; 17. a motor shell II; 18. and a motor shell III.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Description of the preferred embodiments

As shown in fig. 1, 2 and 3, the present utility model provides a technical solution: the middle motor using the flexible speed reducer comprises a middle shaft 3 and a torque sensor module 8, wherein a flying core II 5 is arranged on the outer side of the middle shaft 3, a ratchet ring 4 is arranged on the outer side of the flying core II 5, a deformation block 6 is arranged on one side of the flying core II 5, a strain gauge 7 is attached to the outer side of the deformation block 6, the torque sensor module 8 is arranged on one side of the strain gauge 7, the torque sensor module 8 is used for detecting the torque in the prior art, a torque sensor for an electric bicycle with a bulletin number of CN212458735U can be referred to, a stator assembly 9 is arranged on one side of the torque sensor module 8, a rotor 10 is arranged on the outer side of the stator assembly 9, a driving wave exciter 12 is connected with the other end of the rotor 10 through a spline, a flexible rotating wheel 13 is arranged on the outer side of the driving wave exciter 12, a rigid fixed wheel 14 is arranged on the outer side of the flexible rotating wheel 13, a one-way bearing 15 is connected with the other end of the flexible rotating wheel 13, the flexible rotating wheel 13 is connected with a core wheel 2 through the one-way bearing 15, the rigid fixed wheel 14 is fixedly provided with a motor housing three 18, the outer side of the rigid fixed wheel 14 is a flexible fixed wheel, the flexible fixed wheel 14 is a gear is meshed with the outer ring of the flexible gear, the flexible gear is meshed with the flexible gear is a plurality of stages, the gear is meshed with the outer ring of the flexible gear is more than the flexible gear 13 is meshed with the flexible gear, and the gear is the outer ring is made of the flexible gear is a steel gear with more of a gear, the gear is more of a gear is a gear with more gear is a gear with a gear; and the flexible rotating wheel 13 is elastic, compared with the common multi-stage gear reduction mechanism, each stage is in rigid engagement, so that the engagement noise can be greatly reduced, the driving wave exciter 12 is made of hard alloy steel, the surface wear resistance is enhanced, the flexible rotating wheel 13 rotates along the rigid fixed wheel 14 through the driving wave exciter 12 and the rotor 10, two ends, three sections or multiple ends of teeth are engaged between the flexible rotating wheel 13 and the rigid fixed wheel 14, and one of the speed ratio calculation formulas of the common multi-stage gear reduction mechanism is as follows: total = N slave/N master: tooth number of the driving end gear, N is as follows: the number of teeth of the driven end gear; and the flexible speed reducer Ntotal=N2/(N1-N2) speed ratio is calculated as Ntotal: rigid fixed wheel 14 and flexible runner 13 transmission ratio, N1: rigid fixed gear 14 tooth number, N2: the number of teeth of the flexible rotating wheel 13. Typically the rigid fixed wheel 14 has more than 2 teeth than the flexible wheel 13; namely: N1-N2 is more than or equal to 2, and the calculation formula is as follows: total = N2/(N1-N2); this formula applies to both end and multi-end tooth occlusions of rigid stator 14 and flexible rotor 13. Under the general condition, the number of the teeth-engaged ends is 2-3, the manufacturing and debugging difficulty of multi-end teeth-engaged is increased, the mass production is not facilitated, compared with a common multi-stage gear reduction mechanism, the large speed ratio is easier to make, compared with the common multi-stage gear reduction mechanism, the number of gears is large, the number of engagement stages is large, the manufacturing cost is high, the debugging is difficult, and each stage of gears is even provided with bearings at two ends, so that the concentricity and the jumping degree of axial rotation can be guaranteed, the flexible reducer core part is composed of three large parts of a driving wave exciter 12, a rigid fixed wheel 14 and a flexible rotating wheel 13, teeth of the rigid fixed wheel 14 and the flexible rotating wheel 13 are alternatively engaged, the teeth of the rigid fixed wheel 14 and the flexible rotating wheel 13 are alternatively engaged at two ends or three ends, the common multi-stage gear reduction mechanism is not required to be provided with a plurality of bearings, only the rigid fixed wheel 14 serving as an output end needs to be connected by bearings, so that the output is stable, the rigid fixed wheel 14 rotates anticlockwise, the rigid fixed wheel 14 moves in a clockwise direction, the flexible fixed wheel 13 rotates, and rotates clockwise, and simultaneously, the teeth of the rigid fixed wheel 14 and the flexible fixed wheel 13 alternately rotate, and the core is alternately engaged, and the core 2 rotates, and is provided with a fly 1.

Example two

The scheme in the first embodiment is further described below in conjunction with a specific working manner, and the details are described below:

as shown in fig. 1, in the above-described embodiment, the driving wave exciter 12 and the rotor 10 are formed into an integral structure by a spline, the flexible runner 13 and the one-way bearing 15 are formed into an integral structure, the driving wave exciter 12 and the rotor 10 are connected into a whole by a spline, and the flexible runner 13 and the one-way bearing 15 are driven into a whole. The structure of the motor assembly is here an 'outer transmission substructure', i.e. the rotor 10 is outside the stator assembly 9, or it may be designed as an 'inner rotor structure', i.e. the rotor 10 is inside the stator assembly 9. However, the drive wave exciter 12 of the flexible decelerator can only be integrally connected to the rotor 10, either by an 'outer transmission substructure' or an 'inner rotor structure'. The motor housing III 18 is connected with the rotor 10 through the common bearing 11, one side of the motor housing III 18 is connected with the motor housing I16, the other side of the motor housing III 18 is connected with the motor housing II 17, and the motor housing I16, the motor housing II 17 and the motor housing III 18 form a shell of the middle motor so as to protect components running inside.

From the above, it can be seen that:

the utility model aims at the technical problems that: the traditional central motor generally adopts a multi-stage gear reduction mechanism or a planetary reduction mechanism, the reduction mechanism has larger volume and is difficult to make a large-speed-ratio design, and is limited by the reduction mechanism, and the traditional central motor has a large number of irregular three-dimensional patterns, has larger volume and smaller speed ratio, and the transmitted torque is limited by the speed ratio and can not be increased, so the problems of complex structure, quite high cost and large assembly and debugging difficulty of the traditional central motor reduction mechanism are solved; the technical scheme of each embodiment is adopted. Meanwhile, the implementation process of the technical scheme is as follows:

the electric bicycle rider rides forward by pedaling, pedal force drives the middle shaft 3 to rotate clockwise, at the moment, the second flying core 5 and the ratchet ring 4 are combined with each other, stress generated after combination acts on the deformation block 6, so that the deformation block 6 generates elastic deformation, a deformation signal is captured by the strain gauge 7 and is captured by the torque sensor module 8, the deformation signal is transmitted to the bicycle controller, the bicycle controller transmits the signal to the sub-assembly 9 after processing, the stator assembly 9 is electrified instantly, the rotor 10 rotates anticlockwise at the moment, the driving wave exciter 12 and the rotor 10 are connected into a whole through splines, the driving wave exciter 12 is driven to rotate anticlockwise together, and the driving wave exciter 12 drives the flexible rotating wheel 13 to rotate clockwise in the rigid fixed wheel 14. At this time, under the action of the unidirectional bearing 15, the flexible rotating wheel 13 and the core wheel 2 are combined and rotate together in a clockwise direction, and the force acting on the core wheel 2 is the forward power of the motor for the pedal, and the power is transmitted to the bicycle chain through the first flying core 1.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A center motor using a flexible decelerator, comprising: the novel flywheel comprises a middle shaft (3) and a torque sensor module (8), and is characterized in that a flywheel core II (5) is arranged on the outer side of the middle shaft (3), a ratchet ring (4) is arranged on the outer side of the flywheel core II (5), a deformation block (6) is arranged on one side of the flywheel core II (5), a strain gauge (7) is attached to the outer side of the deformation block (6), the torque sensor module (8) is arranged on one side of the strain gauge (7), a stator assembly (9) is arranged on one side of the torque sensor module (8), a rotor (10) is arranged on the outer side of the stator assembly (9), a driving wave exciter (12) is connected to the other end of the rotor (10) through a spline, a flexible rotating wheel (13) is arranged on the outer side of the driving wave exciter (12), a rigid fixed wheel (14) is arranged on the outer side of the flexible rotating wheel (13), a one-way bearing (15) is connected to the flexible rotating wheel (13), and a core wheel (2) is connected to one side of the core wheel (2) through the one-way bearing (15).

2. The middle motor using the flexible speed reducer as claimed in claim 1, wherein the rigid fixed wheel (14) is a fixed body, a motor housing III (18) is fixed on the outer side of the rigid fixed wheel (14), the rigid fixed wheel (14) is made of hard steel, the surface is subjected to wear-resistant strengthening treatment, and the inner ring is toothed.

3. The centrally-mounted motor using the flexible speed reducer according to claim 1, wherein the flexible rotating wheel (13) is made of flexible steel, the outer ring is tooth-shaped, and the outer ring of the flexible rotating wheel (13) is meshed with the inner ring of the rigid fixed wheel (14).

4. The centrally-mounted motor using the flexible speed reducer according to claim 1, wherein the driving wave exciter (12) is made of hard alloy steel, the surface is subjected to wear-resisting strengthening treatment, and the flexible rotating wheel (13) rotates along the rigid fixed wheel (14) through the driving wave exciter (12) and the rotor (10).

5. A mid-motor using a flexible decelerator according to claim 3, wherein the flexible rotating wheel (13) and the rigid fixed wheel (14) are engaged with each other by two, three or more teeth.

6. A mid-motor using a flexible decelerator according to claim 1, wherein the driving wave exciter (12) is formed in an integral structure with the rotor (10) through a spline, and the flexible rotating wheel (13) is formed in an integral structure with the one-way bearing (15).

7. A mid-motor using a flexible reducer according to claim 2, wherein the motor housing three (18) and the rotor (10) are connected by a common bearing (11), one side of the motor housing three (18) is connected with a motor housing one (16), and the other side of the motor housing three (18) is connected with a motor housing two (17).