CN220830372U

CN220830372U - Centrally-mounted motor with harmonic reducer

Info

Publication number: CN220830372U
Application number: CN202322045077.8U
Authority: CN
Inventors: 侯茜
Original assignee: Pixel Intelligent Technology Suzhou Co ltd
Current assignee: Pixel Intelligent Technology Suzhou Co ltd
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2024-04-23
Anticipated expiration: 2033-08-01

Abstract

The utility model relates to the field of centrally-mounted motors of electric bicycles, in particular to a centrally-mounted motor with a harmonic reducer, which comprises a motor, the harmonic reducer, a motor main body and a core wheel assembly; the motor body is in a shell shape; the motor is connected with the motor main body through a connecting part, wherein the connecting part is positioned outside the motor and the motor main body; the harmonic reducer is for receiving kinetic energy of the motor and for imparting kinetic energy to the core assembly. Because the position of the connecting part is positioned outside the motor and the motor main body, the mutual separation of the motor and the harmonic reducer can be realized only by taking down the connecting part, thereby improving the dismounting efficiency of dismounting the motor and the harmonic reducer.

Description

Centrally-mounted motor with harmonic reducer

Technical Field

The utility model relates to the field of centrally-mounted motors of electric bicycles, in particular to a centrally-mounted motor with a harmonic reducer.

Background

In the prior art, a title intelligent central harmonic speed reduction motor is provided, and the patent document with the application number 202080000082.3 is filed; in this prior art, a harmonic speed reducer is specifically employed as a speed reducer for adjusting the rotational speed of a motor.

In the prior art, the motor and the harmonic reducer are connected by bolts, wherein the bolts are positioned in a shell of the motor and a shell for accommodating the harmonic reducer, and meanwhile, a detachable controller, a motor rotor, a stator and other structures are arranged on the motor.

Disclosure of utility model

In order to solve the technical problem of low disassembly and assembly efficiency of a motor and a harmonic reducer in the prior art, the utility model provides a centrally-mounted motor with the harmonic reducer.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

According to one aspect of the present utility model, there is provided a center motor having a harmonic reducer, comprising a motor, a harmonic reducer, a motor body, and a core assembly;

The motor main body is in a shell shape;

The harmonic speed reducer and the core wheel assembly are respectively arranged in a motor main body, the motor is positioned outside the motor main body, the harmonic speed reducer is positioned between the motor and the core wheel assembly, the motor and the motor main body are connected through a connecting part, and the connecting part is positioned outside the motor and the motor main body;

The harmonic reducer is for receiving kinetic energy of the motor and for imparting kinetic energy to the core assembly.

Further, a first annular flange is arranged on the shell of the motor;

the motor main body is provided with a second annular flange;

The connecting component is specifically a quick-release hoop, and the quick-release hoop is buckled on the first flange and the second flange in a surrounding state.

Further, a motor shaft of the motor is coaxially connected with a harmonic generator of the harmonic reducer;

The core wheel assembly comprises a driving bevel gear, a driven bevel gear and a central shaft, wherein the driven bevel gear is sleeved on the central shaft, and the driving bevel gear is meshed with the driven bevel gear;

the driving bevel gear is connected with the flexible gear through a first one-way clutch assembly, the driving bevel gear is provided with a cylindrical section and a bevel gear section, the cylindrical section and the bevel gear section are coaxially arranged, the first one-way clutch assembly is sleeved on the cylindrical section, and the first one-way clutch assembly is coaxially connected with the flexible gear of the harmonic reducer.

Further, the first one-way clutch assembly comprises a lock nut, a pressing block, an output bracket, a base, a first one-way clutch and a base sleeve;

the base is constrained between the output support and the base sleeve;

The output support is provided with a positioning plate and a positioning sleeve, the positioning sleeve and the positioning plate are integrally manufactured, two ends of the positioning sleeve are respectively a head end and a tail end, the positioning plate is positioned between the head end and the tail end, the head end is provided with external threads, the head end is arranged to penetrate through the flexible wheel, the head end is connected with the locking nut, the pressing block is arranged between the flexible wheel and the locking nut, and the pressing block is sleeved at the head end;

The positioning plate is provided with a first positioning hole, the pressing block is provided with a second positioning hole, and the first positioning hole is connected with the second positioning hole through a positioning pin;

the base sleeve is provided with an installation cavity and an installation through hole, the installation cavity and the installation through hole are coaxial and communicated, and the first one-way clutch is arranged in the installation cavity;

The base is annular, the base is sleeved on the base sleeve, and a bearing is arranged between the base and the base sleeve;

The tail ends of the positioning sleeves are respectively inserted into the base and the mounting cavity, wherein the first one-way clutch is positioned between the base sleeve and the positioning sleeve;

The driving bevel gear is inserted into the base sleeve and the positioning sleeve, wherein a clamping groove is formed in the cylindrical section of the driving bevel gear, and the driving bevel gear is fixed in the installation cavity through the clamping groove and the clamping spring.

Further, the core wheel assembly further comprises an excessive clutch sleeve, a supporting sleeve and a second one-way clutch;

The excessive clutch sleeve is sleeved on the center shaft, the supporting sleeve is sleeved on the center shaft and the excessive clutch sleeve respectively, and the excessive clutch sleeve is positioned between the supporting sleeve and the center shaft;

the second one-way clutch is arranged between the excessive clutch sleeve and the supporting sleeve.

Further, the motor main body is provided with a first mounting port and a second mounting port, and the diameter of the first mounting port is larger than that of the second mounting port;

an annular flange is arranged on the inner wall of the motor main body positioned at the second mounting port;

The diameter of the central shaft, the diameter of the excessive clutch sleeve, the diameter of the supporting sleeve and the diameter of the driven bevel gear are respectively smaller than the diameter of the first mounting opening, wherein the central shaft penetrates through the annular flange, and the central shaft and the annular flange are configured to be in clearance fit;

The diameter of the excess clutch sleeve, the diameter of the support sleeve and the diameter of the driven bevel gear are respectively larger than the diameter of the annular flange.

Further, the core wheel assembly further comprises an output wheel and a locking ring;

The output wheel is in a sleeve shape and is at least provided with a positioning cavity and a positioning through hole, wherein the positioning cavity and the positioning through hole are coaxial and communicated, and the diameter of the positioning cavity is larger than that of the positioning through hole;

One end of the supporting sleeve is inserted into the positioning cavity, and one end of the driven bevel gear is sleeved at one end of the output wheel;

the diameter of the output wheel is smaller than that of the first mounting opening;

The locking ring is connected with the motor main body located at the first mounting opening, wherein the locking ring is provided with external threads, and the motor main body is provided with internal threads.

Further, the support sleeve is provided with a first pin hole, the driven bevel gear is provided with a second pin hole, and the output wheel is provided with a third pin hole;

at least one of the first pin bore, the second pin bore, and the third pin bore is provided with internal threads;

The first pin hole, the second pin hole and the third pin hole are adjusted to be coaxial and communicated, and the first pin hole, the second pin hole and the third pin hole are inserted by the same set screw, wherein the set screw is in threaded connection with one of the first pin hole, the second pin hole and the third pin hole.

Further, one end of the driven bevel gear facing the output wheel is a positioning end, and a positioning protrusion is arranged on the positioning end;

a boss is arranged on the circumferential outer surface of the output wheel, and a rotation stopping groove is arranged at one end of the boss facing the driven bevel gear;

The positioning protrusion is clamped into the rotation stopping groove.

The technical scheme has the following advantages or beneficial effects:

According to the centrally-mounted motor with the harmonic reducer, the connecting part is positioned outside the motor and the motor main body, so that the motor and the harmonic reducer can be separated from each other only by taking down the connecting part, and the dismounting efficiency of dismounting the motor and the harmonic reducer is improved.

Drawings

Fig. 1 is a schematic structural diagram of a center motor with a harmonic reducer according to embodiment 1 of the present utility model;

fig. 2 is a partial enlarged view of a portion a in fig. 1;

fig. 3 is a schematic structural view of a connecting member according to embodiment 1 of the present utility model;

Fig. 4 is a schematic structural diagram of a harmonic reducer according to embodiment 1 of the present utility model;

FIG. 5 is a schematic structural view of a core assembly according to embodiment 1 of the present utility model;

Fig. 6 is a partial enlarged view of a portion B in fig. 5;

fig. 7 is a schematic structural diagram of a center motor with a harmonic reducer according to embodiment 1 of the present utility model;

fig. 8 is a schematic structural view of a motor, a motor main body and a connecting member provided in embodiment 1 of the present utility model;

fig. 9 is a schematic structural view of a first one-way clutch assembly according to embodiment 1 of the present utility model.

Detailed Description

Example 1:

In the present embodiment, referring to fig. 1, there is provided a center motor having a harmonic reducer, including a motor 1, a harmonic reducer 2, a motor main body 3, and a core wheel assembly 4;

The motor body 3 is in a shell shape;

The harmonic reducer 2 and the core wheel assembly 4 are respectively arranged in the motor main body 3, the motor 1 is positioned outside the motor main body 3, the harmonic reducer 2 is positioned between the motor 1 and the core wheel assembly 4, the motor 1 and the motor main body 3 are connected through the connecting part 5, and the connecting part 5 is positioned outside the motor 1 and the motor main body 3;

The harmonic reducer 2 is for receiving kinetic energy of the motor 1 and for applying kinetic energy to the core assembly 4.

The structure of the harmonic reducer 2 is common knowledge known to those skilled in the art, and referring to fig. 4, it specifically includes a steel wheel 203, a flexspline 202 and a harmonic generator 201; the steel wheel 203 is made of rigid materials, and the steel wheel 203 is circular and is provided with an annular gear; the flexible gear 202 is made of a deformable material, and the flexible gear 202 is provided with an outer gear ring; the number of teeth of the inner gear ring of the steel wheel 203 is more than that of the outer gear ring of the flexible wheel 202, and at the same time, a part of teeth of the flexible wheel 202 are meshed with a part of teeth of the steel wheel 203; the harmonic generator 201 is elliptical, and a shaft hole for installing a motor shaft is formed in the harmonic generator 201; when the flexible gear 202 is sleeved on the harmonic generator 201, the flexible gear 202 is elliptical.

The motor shaft of the motor 1 is coaxially connected with the shaft hole of the harmonic generator 201, when the motor shaft rotates, the harmonic generator 201 rotates, the tooth number difference between the flexible wheel 202 and the steel wheel 203 forms a speed reducing structure, and therefore the flexible wheel 202 after speed reduction outputs kinetic energy to the core wheel assembly 4.

The core assembly 4 in this embodiment may adopt the structure of the core assembly in the prior art, for example: in the patent document named intelligent central harmonic speed reducing motor, the application number is 202080000082.3, namely a first bevel gear, a second bevel gear, a middle shaft, a first isolator, a second isolator and the like.

The core wheel assembly 4 of the present embodiment provides a preferred structure, a specific preferred structure is described later, and is not mentioned here.

In this embodiment, preferably, referring to fig. 1 or fig. 2 or fig. 8, a first flange 101 having a ring shape is provided on the housing of the motor 1;

The motor body 3 is provided with a second annular flange 301;

The connection member 5 is specifically a quick-release hoop, which is provided to be snap-fitted around the first flange 101 and the second flange 301.

When the motor 1 is covered on the motor main body 3 and the harmonic reducer 2, a motor shaft of the motor 1 is inserted into a shaft hole of the harmonic generator 201 of the harmonic reducer 2, so that the connection between the motor 1 and the demon reducer is formed; simultaneously, the first flange 101 and the second flange 301 are contacted with each other to form a convex structure for being buckled by the quick-release hoop; before the quick-release hoops are buckled on the first flange 101 and the second flange 301, the quick-release hoops are adjusted to be loose, so that the area of the inner outline of the quick-release hoops is increased, and the current quick-release hoops can be sleeved on the first flange 101 and the second flange 301; after the quick-release hoop is sleeved on the first flange 101 and the second flange 301, the quick-release hoop is adjusted to be in a locking shape, so that the area of the inner outline of the quick-release hoop is reduced, the current quick-release hoop can clamp the first flange 101 and the second flange 301, and the connection between the motor 1 and the motor main body 3 is formed.

In addition, in the present embodiment, a bolt (not shown in the drawings) may also be employed as the connection member 5; specifically, the first flange 101 is provided with a connection through hole, the second flange 301 is provided with a threaded through hole, and when the first flange 101 and the second flange 301 are in contact with each other and the connection through hole and the threaded through hole are adjusted to be communicated, a bolt is used to penetrate the connection through hole and then connect with the threaded through hole.

In the prior art (named as intelligent centrally-mounted harmonic speed reducer motor, patent document with application number 202080000082.3), a motor and a harmonic speed reducer are connected through bolts, and the structures such as a controller, a motor rotor and a stator are required to be removed firstly, and then the bolts can be separated from the motor and the harmonic speed reducer, so that the disassembly and assembly efficiency between the motor and the harmonic speed reducer is low.

In this embodiment, the connecting component 5 is located outside the motor 1 and the motor main body 3, so that the motor 1 and the harmonic reducer 2 can be separated from each other only by removing the connecting component 5, and compared with the prior art, at least the step of removing the controller, the motor rotor, the stator and other structures is saved, thereby improving the disassembly and assembly efficiency of disassembling the motor 1 and the harmonic reducer 2.

Further, referring to fig. 1 or fig. 5 or fig. 7, in the present embodiment, a center motor having a harmonic reducer 2, a motor shaft of a motor 1 and a harmonic generator 201 of the harmonic reducer 2 are coaxially connected;

The core wheel assembly 4 comprises a driving bevel gear 401, a driven bevel gear 402 and a middle shaft 403, wherein the driven bevel gear 402 is sleeved on the middle shaft 403, and the driving bevel gear 401 is meshed with the driven bevel gear 402;

The driving bevel gear 401 and the flexible gear 202 are connected through the first one-way clutch assembly 6, wherein the driving bevel gear 401 is provided with a cylindrical section 001 and a bevel gear section 002, the cylindrical section 001 and the bevel gear section 002 are coaxially arranged, the first one-way clutch assembly 6 is sleeved on the cylindrical section 001, and the first one-way clutch assembly 6 is coaxially connected with the flexible gear 202 of the harmonic reducer 2.

Wherein, the kinetic energy of the motor 1 is transmitted to the driving bevel gear 401 through the harmonic reducer 2, the driving bevel gear 401 is meshed with the driven bevel gear 402, and thus the driving bevel gear 401 is transmitted to the driven bevel gear 402 after receiving the kinetic energy; because the axial lead of the driving bevel gear 401 and the axial lead of the bevel gear are arranged vertically to each other, the driving bevel gear 401 and the driven bevel gear 402 form a turning transmission structure;

The driven bevel gear 402 is sleeved on the middle shaft 403, and the driven bevel gear 402 can drive the middle shaft 403 to rotate.

The first one-way clutch assembly 6 is disposed between the harmonic reducer 2 and the driving bevel gear 401, the first one-way clutch assembly 6 functioning as a one-way transmission structure between the harmonic reducer 2 and the driving bevel gear 401; the flexspline 202 of the harmonics generator 201 drives the driving bevel gear 401 in a single direction through a first single clutch assembly; for example, when the rotation direction of the motor shaft of the motor 1 is clockwise, the motor shaft drives the first one-way clutch assembly 6 to rotate through the harmonics generator 201 so that the first one-way clutch assembly 6 drives the driving bevel gear 401 to rotate in the clockwise direction, whereas when the rotation direction of the motor shaft of the motor 1 is counterclockwise, the motor shaft drives the first one-way clutch assembly to rotate through the harmonics generator 201, but since the first one-way clutch assembly cannot rotate in the counterclockwise direction at this time, the driving bevel gear 401 cannot rotate in the counterclockwise direction.

It should be understood that the provision of a one-way clutch in a mid-motor of the prior art is common knowledge to those skilled in the art; the position of the first one-way clutch assembly 6 in this embodiment is different from that of the one-way clutch in the prior art; in the prior art (patent document named intelligent central harmonic speed reduction motor, application number 202080000082.3), the first one-way clutch assembly 6 is sleeved on the middle shaft 403, but in the embodiment, the first one-way clutch assembly 6 is arranged at the harmonic speed reducer 2, and a significant distance is reserved between the first one-way clutch assembly 6 and the middle shaft 403.

Further, referring to fig. 9, the mid-motor with the harmonic reducer 2 of the present embodiment, the first one-way clutch assembly 6 includes a lock nut 601, a pressing block 602, an output bracket 603, a base 604, a first one-way clutch 605 and a base sleeve 606;

The base 604 is constrained between the output support 603 and the base 606;

The output bracket 603 is provided with a positioning plate 003 and a positioning sleeve 004, the positioning sleeve 004 and the positioning plate 003 are integrally manufactured, two ends of the positioning sleeve 004 are respectively a head end 005 and a tail end 006, the positioning plate 003 is positioned between the head end 005 and the tail end 006, the head end 005 is provided with external threads, the head end 005 is arranged to penetrate through the flexible wheel 202, the head end 005 is connected with the locking nut 601, a pressing block 602 is arranged between the flexible wheel 202 and the locking nut 601, and the pressing block 602 is sleeved on the head end 005;

The positioning plate 003 is provided with a first positioning hole 007, the pressing block 602 is provided with a second positioning hole 008, and the first positioning hole 007 is connected with the second positioning hole 008 through a positioning pin;

The base sleeve 606 is provided with a mounting cavity 009 and a mounting through hole 010, the mounting cavity 009 and the mounting through hole 010 are coaxial and communicated, and the first one-way clutch 605 is arranged in the mounting cavity 009;

The base 604 is annular, the base 604 is sleeved on the base sleeve 606, and a bearing is arranged between the base 604 and the base sleeve 606;

The distal end 006 of the positioning sleeve 004 is inserted into the base 604 and the mounting cavity 009, respectively, wherein the first one-way clutch 605 is located between the base sleeve 606 and the positioning sleeve 004;

The driving bevel gear 401 is inserted into the base sleeve 606 and the positioning sleeve 004, wherein the cylindrical section 001 of the driving bevel gear 401 is provided with a clamping groove, and the driving bevel gear 401 is fixed in the mounting cavity 009 through the clamping groove and the clamping spring.

Wherein the first one-way clutch 605, the base sleeve 606, the base 604 are configured in a coaxial connection structure, the bearing is positioned between the base 604 and the base sleeve 606, and the first one-way clutch 605 is positioned in the base sleeve 606; the base 604 is integrally provided in the motor main body 3; preferably, the base 604 is screwed with the motor body 3, wherein the base 604 is provided with external threads and the inner wall of the motor body 3 is provided with internal threads; by adopting the above-described connection method, the entire structure of the output bracket 603, the first one-way clutch 605, the base sleeve 606, the base 604, and the bearing can be connected to or disconnected from the motor main body 3 at the same time, and the efficiency of attaching and detaching the output bracket 603, the first one-way clutch 605, the base sleeve 606, the base 604, and the bearing to and from the motor main body 3 can be improved.

The head end 005 of the positioning sleeve 004 of the output support 603 penetrates through the flexible gear 202, the output support 603 is coaxially connected with the flexible gear 202 through the pressing block 602 and the locking nut 601, wherein a third positioning hole for penetrating through a positioning pin is formed in the flexible gear 202, the first positioning hole 007 of the positioning plate 003, the second positioning hole 008 of the pressing block 602 and the third positioning hole of the flexible gear 202 are respectively connected through the positioning pin, the flexible gear 202 is prevented from rotating relative to the output support 603, and in addition, the pressing block 602 is locked relative to the output support 603 through the locking nut 601, so that the flexible gear 202 and the output support 603 are prevented from being separated along the axial direction of the positioning sleeve 004.

The cylindrical section 001 of the driving bevel gear 401 is inserted into the mounting through hole 010 of the base sleeve 606 and reaches the mounting cavity 009 of the base sleeve 606, and the driving bevel gear 401 and the base sleeve 606 are prevented from being separated from each other by clamping the clamping springs in the clamping grooves of the cylindrical section 001.

In this embodiment, two bearings are provided between the base 606 and the base 604; specifically, a positioning clamping groove is formed in the middle of the outer circumference of the base sleeve 606, and the positioning clamping groove is clamped by the positioning clamping spring, so that the two end faces of the positioning clamping spring respectively form a limiting position for limiting the position of one bearing, namely, the two bearings are respectively located on two sides of the positioning clamping spring, and the two bearings are respectively blocked by the positioning clamping spring.

Further, referring to fig. 5 or 7, the center motor with the harmonic reducer 2 of the present embodiment, the core wheel assembly 4 further includes an overrunning clutch housing 404, a supporting housing 405, and a second one-way clutch 406;

The excessive clutch sleeve 404 is sleeved on the middle shaft 403, and the supporting sleeve 405 is sleeved on the middle shaft 403 and the excessive clutch sleeve 404 respectively, wherein the excessive clutch sleeve 404 is positioned between the supporting sleeve 405 and the middle shaft 403;

A second one-way clutch 406 is provided between the excess clutch sleeve 404 and the support sleeve 405.

Wherein, the excessive clutch sleeve 404 is sleeved on the middle shaft 403, and the excessive clutch sleeve 404 and the middle shaft 403 are preferably matched by adopting a spline, so that the assembly difficulty between the excessive clutch sleeve 404 and the middle shaft 403 is reduced;

The inner surface of the supporting sleeve 405 forms interference connection with the outer surface of the second one-way clutch 406, meanwhile, the supporting sleeve 405 is sleeved on the excessive clutch sleeve 404, and the excessive clutch sleeve 404 is inserted into the second one-way clutch 406, so that the outer surface of the excessive clutch sleeve 404 forms interference connection with the inner surface of the second one-way clutch 406;

The driven bevel gear 402 is sleeved on the supporting sleeve 405, and the driven bevel gear 402 and the supporting sleeve 405 form clearance fit and form detachable connection through a set screw 018;

When the driven bevel gear 402 is driven in the clockwise direction, the driven bevel gear 402 drives the supporting sleeve 405 to rotate in the instantaneous direction, the supporting sleeve 405 drives the excessive clutch sleeve 404 to rotate in the clockwise direction through the second one-way clutch 406, and the excessive clutch drives the middle shaft 403 to rotate in the clockwise direction, so that the kinetic energy of the motor 1 is formed to drive the middle shaft 403 to rotate; conversely, when the driven bevel gear 402 is driven in the counterclockwise direction, the excessive clutch sleeve 404 and the bottom bracket 403 are prevented from rotating in the counterclockwise direction due to the presence of the second one-way clutch 406, although the driven bevel gear 402 drives the support sleeve 405 to rotate in the counterclockwise direction and the support sleeve 405 drives the second one-way clutch 406 to rotate in the counterclockwise direction.

It should be understood that the position of the second one-way clutch 406 in the present embodiment is different from that of the second one-way clutch in the related art (patent document named intelligent center harmonic reduction motor, patent document 202080000082.3); the second one-way clutch 406 of the present embodiment is located between the support sleeve 405 and the overrunning sleeve 404, while the second one-way clutch of the prior art described above is located between the torsion sleeve and the second bevel gear.

Further, referring to fig. 8, the center motor with the harmonic reducer 2 of the present embodiment, the motor main body 3 is provided with a first mounting port 011 and a second mounting port 012, the diameter of the first mounting port 011 is larger than the diameter of the second mounting port 012;

An annular flange 302 is provided on the inner wall of the motor body 3 located at the second mounting port 012;

The diameter of the central shaft 403, the diameter of the excess clutch sleeve 404, the diameter of the support sleeve 405 and the diameter of the driven bevel gear 402 are respectively smaller than the diameter of the first mounting opening 011, wherein the central shaft 403 penetrates the annular flange 302, and the central shaft 403 and the annular flange 302 are configured as a clearance fit;

The diameter of the overrunning clutch sleeve 404, the diameter of the support sleeve 405 and the diameter of the driven bevel gear 402 are each greater than the diameter of the annular flange 302.

In this embodiment, two ends of the central shaft 403 are defined as a head end 013 and a tail end 014, respectively; a clamping groove is formed in the head end 013 of the middle shaft 403, after the head end 013 of the middle shaft 403 penetrates through the annular flange 302 along the direction from the first mounting port 011 to the second mounting port 012, the clamping groove at the head end 013 is exposed out of the motor main body 3, and therefore the middle shaft 403 can be prevented from being separated from the motor main body 3 along the direction from the second mounting port 012 to the first mounting port 011 by arranging a clamping spring in the clamping groove at the head end 013;

In this embodiment, the above-mentioned structures such as the excessive clutch sleeve 404, the supporting sleeve 405, the driven bevel gear 402, and the second one-way clutch 406 are respectively disposed on the center shaft 403, and meanwhile, the diameters of the center shaft 403, the excessive clutch sleeve 404, the supporting sleeve 405, and the driven bevel gear 402 are respectively smaller than the diameters of the first mounting openings 011, so that when the center shaft 403 is removed along the direction from the second mounting opening 012 to the first mounting opening 011, the structures such as the excessive clutch sleeve 405 and the driven bevel gear 402 are simultaneously removed from the motor main body 3, thereby improving the assembly and disassembly efficiency of the structures such as the center shaft 403, the excessive clutch sleeve 404, the supporting sleeve 405, the driven bevel gear 402, and the second one-way clutch 406 relative to the motor main body 3.

Further, referring to fig. 5 to 7, the center motor with the harmonic reducer 2 of the present embodiment, the core wheel assembly 4 further includes an output wheel 407 and a locking ring 408;

the output wheel 407 is in a sleeve shape, and the output wheel 407 is at least provided with a positioning cavity 016 and a positioning through hole 017, wherein the positioning cavity 016 and the positioning through hole 017 are coaxial and communicated, and the diameter of the positioning cavity 016 is larger than that of the positioning through hole 017;

One end of the supporting sleeve 405 is inserted into the positioning cavity 016, and one end of the driven bevel gear 402 is sleeved on one end of the output wheel 407;

The diameter of the output wheel 407 is smaller than the diameter of the first mounting port 011;

The locking ring 408 is connected to the motor body 3 at the first mounting opening 011, wherein the locking ring 408 is provided with external threads and the motor body 3 is provided with internal threads.

The output wheel 407 is used for installing a dental disc 7, the dental disc 7 is located outside the motor main body 3, and the dental disc 7 is coaxially connected with the output wheel 407.

The output wheel 407 is inserted into the motor main body 3, and a bearing is arranged between the outer circumference of the output wheel 407 and the motor main body 3, so that the output wheel 407 and the motor main body 3 form a coaxial rotatable connection mode; the output wheel 407 is sleeved on the middle shaft 403, the middle shaft 403 penetrates through the positioning through hole 017, and a needle bearing is arranged between the output wheel 407 and the middle shaft 403, so that the output wheel 407 and the middle shaft 403 form a coaxial rotatable connection mode through the needle bearing;

The locking ring 408 is used to restrict the output wheel 407 to the motor body 3, so that the output wheel 407 forms a rotatable and non-separable connection with the motor body 3; specifically, an external thread is provided on the outer circumference of the locking ring 408, a spigot is provided on the inner circumference of the locking ring 408, and correspondingly, an internal thread is provided on the inner wall of the first mounting opening 011 of the motor main body 3; when the locking ring 408 is sleeved on the output wheel 407, the spigot of the locking ring 408 contacts the output wheel 407 along the axial line direction of the center shaft 403, and meanwhile, the external thread of the locking ring 408 is connected with the internal thread of the motor main body 3, so that the locking ring 408 and the motor main body 3 form a detachable connection mode, and the locking ring 408 blocks the output wheel 407, thereby preventing the output wheel 407 from being separated from the motor main body 3 along the direction from the second mounting port 012 to the first mounting port 011.

It should be appreciated that after locking the locking ring 408 relative to the motor body 3, the aforementioned structures of the center shaft 403, the excessive clutch sleeve 404, the support sleeve 405, the driven bevel gear 402, the second one-way clutch 406, etc. are blocked by the output wheel 407, respectively, so that the structures of the center shaft 403, the excessive clutch sleeve 404, the support sleeve 405, the driven bevel gear 402, the second one-way clutch 406, etc. cannot be disengaged from the motor body 3; on the contrary, after the locking ring 408 is removed from the motor main body 3, and after the snap spring at the head end 013 of the middle shaft 403 is removed, the middle shaft 403, the excessive clutch sleeve 404, the supporting sleeve 405, the driven bevel gear 402, the second one-way clutch 406, the output wheel 407 and other structures can be simultaneously removed from the motor main body 3 at the first mounting opening 011, thereby improving the dismounting efficiency.

Further, referring to fig. 5 or 6, in the mid-motor with the harmonic reducer 2 of the present embodiment, the supporting sleeve 405 is provided with a first pin hole, the driven bevel gear 402 is provided with a second pin hole, and the output wheel 407 is provided with a third pin hole;

The first pin bore, the second pin bore, and the third pin bore are adjusted to be coaxial and in communication, the first pin bore, the second pin bore, and the third pin bore being interposed by a common set screw 018, wherein the set screw 018 is in threaded connection with one of the first pin bore, the second pin bore, and the third pin bore.

Wherein an internal thread may be provided at the first pin hole of the support sleeve 405 and/or an internal thread may be provided at the second pin hole of the driven bevel gear and/or an internal thread may be provided in the third pin hole of the output wheel, as long as the set screw 018 is connected with the internal thread of one of the pin holes, and the set screw 018 is inserted into the first pin hole, the second pin hole and the third pin hole, respectively.

Wherein, when the driven bevel gear 402, the supporting sleeve 405 and the output wheel 407 are respectively located outside the motor body 3, they can be respectively inserted into the first pin hole, the second pin hole and the third pin hole by the set screw 018, so that the driven bevel gear 402, the supporting sleeve 405 and the output wheel 407 form a temporary assembly; the temporarily assembled driven bevel gear 402, the supporting sleeve 405 and the output wheel 407 are assembled with the components such as the central shaft 403 and the like respectively, so that the central shaft 403, the driven bevel gear 402, the supporting sleeve 405 and the output wheel 407 and the like are kept in an integrally assembled state in the process of being assembled into the motor main body 3, and the central shaft 403, the driven bevel gear 402, the supporting sleeve 405 and the output wheel 407 and the like are kept in an integrally assembled state in the process of being taken out to the outside of the motor main body 3, which is beneficial to improving the assembly and disassembly efficiency of the centrally-mounted motor with the harmonic reducer 2 in the embodiment.

Further, referring to fig. 6, in the mid-motor with the harmonic reducer 2 of the present embodiment, one end of the driven bevel gear 402 facing the output wheel 407 is a positioning end, and a positioning protrusion 019 is provided on the positioning end;

The outer circumferential surface of the output wheel 407 is provided with a boss, and one end of the boss facing the driven bevel gear 402 is provided with a rotation stopping groove 020;

the positioning protrusion 019 is locked into the rotation stopping groove 020.

The positioning protrusion 019 is caught in the rotation stopping groove 020 so that the movement directions of the output wheel 407 and the driven bevel gear 402 in the circumferential direction are configured to be identical, i.e., when the driven bevel gear 402 rotates in the clockwise direction, the output wheel 407 also rotates in the clockwise direction, and when the output wheel 407 rotates in the clockwise direction, the driven bevel gear 402 also rotates in the clockwise direction, so that the movement directions of the two are configured to be identical.

It should be understood that, when the mid-motor with the harmonic reducer 2 of the present embodiment is actually disposed on the electric bicycle, the driving paths of the driving crankset 7 are two, namely, a first driving path formed by the motor 1 through the harmonic reducer 2, the first one-way clutch 605, the driving bevel gear 401, the driven bevel gear 402, the excessive clutch sleeve 404, the second one-way clutch 406, the supporting sleeve 405 and the output wheel 407, and a second driving path formed by the middle shaft 403 through the second one-way clutch 406, the output wheel 407, the driven bevel gear 402, the second one-way clutch 406 and the supporting sleeve 405;

When the dental tray 7 is driven to rotate through the first transmission path, the first one-way clutch 605 is kept in an engaged state, and the second one-way clutch 406 is kept in a disengaged state, so that the kinetic energy of the motor 1 can be output to the dental tray 7 through the first transmission path;

While driving the dial 7 to rotate through the second transmission path, the second one-way clutch 406 is kept in an engaged state, and the first one-way clutch 605 is kept in a disengaged state, so that kinetic energy from the center shaft 403 can be transmitted to the dial 7 through the second transmission path;

When the dental tray 7 is simultaneously driven to rotate through the first transmission path and the second transmission path, the first one-way clutch 605 and the second one-way clutch 406 are respectively maintained in an engaged state, so that the kinetic energy of the motor 1 can be transmitted to the dental tray 7 through the first transmission path, and the kinetic energy from the center shaft 403 can be transmitted to the dental tray 7 through the second transmission path.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims

1. The middle motor with the harmonic reducer is characterized by comprising a motor, the harmonic reducer, a motor main body and a core wheel assembly;

The motor main body is in a shell shape;

The harmonic reducer comprises a steel wheel and a flexible wheel, wherein the steel wheel is provided with an inner gear ring, the flexible wheel is provided with an outer gear ring, and a part of teeth of the flexible wheel are meshed with a part of teeth of the steel wheel;

2. The center motor with a harmonic reducer according to claim 1, wherein a first flange having a ring shape is provided on a housing of the motor;

the motor main body is provided with a second annular flange;

3. The center motor with a harmonic reducer according to claim 2, wherein a motor shaft of the motor and a harmonic generator of the harmonic reducer are coaxially connected;

4. The mid-motor with harmonic reducer of claim 3, wherein the first one-way clutch assembly comprises a lock nut, a press block, an output carrier, a base, a first one-way clutch, and a base sleeve;

the base is constrained between the output support and the base sleeve;

5. The center motor with harmonic reducer of claim 3, wherein the core assembly further comprises an overrunning clutch sleeve, a support sleeve, and a second one-way clutch;

6. The center motor with a harmonic reducer according to claim 5, wherein the motor main body is provided with a first mounting port and a second mounting port, the diameter of the first mounting port being larger than the diameter of the second mounting port;

7. The center motor with harmonic reducer of claim 6, wherein the core assembly further comprises an output wheel and a locking ring;

8. The center motor with a harmonic reducer according to claim 7, wherein the supporting sleeve is provided with a first pin hole, the driven bevel gear is provided with a second pin hole, and the output wheel is provided with a third pin hole;

9. The center motor with a harmonic reducer according to claim 7, wherein an end of the driven bevel gear facing the output wheel is a positioning end, and a positioning protrusion is arranged on the positioning end;

The positioning protrusion is clamped into the rotation stopping groove.