CN213661364U

CN213661364U - Power assembly of external rotor direct current brushless motor

Info

Publication number: CN213661364U
Application number: CN202022373049.5U
Authority: CN
Inventors: 郭忠明; 张冬燕; 胡艳兰
Original assignee: Nichibo Motor Shenzhen Co ltd
Current assignee: Nichibo Motor Shenzhen Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-07-09
Anticipated expiration: 2030-10-22

Abstract

The utility model discloses an outer rotor DC brushless motor power assembly, which comprises a motor module and a gearbox, wherein the motor module comprises a shaft sleeve, and a control circuit board, a bearing piece, a stator winding and a rotor magnetic pole which are arranged on the shaft sleeve, the inner side of the shaft sleeve is used for installing the bearing piece, the control circuit board and the stator winding can be fixed on the outer side of the shaft sleeve, and the stator winding can partly accomodate the axle sleeve, control circuit board is used for supplying power to the stator winding, the rotor magnetic pole includes the motor shaft with bearing spare sliding fit, make the rotor magnetic pole correspond the radial outside of stator winding and can rotate the setting, the axle sleeve is used for restricting the motor shaft along axial displacement, make the rotor magnetic pole set up the first side at the bearing spare along the axial, the gearbox includes box and tooth axle subassembly, the box can be loaded and unloaded to be fixed at the axle sleeve, make tooth axle subassembly correspond first side setting at the second side of bearing spare and be connected with the motor shaft transmission along the axial. The motor and the gearbox are arranged oppositely through the shaft sleeve, so that the reliability of the power assembly can be improved, and the miniaturization is convenient to realize.

Description

Power assembly of external rotor direct current brushless motor

Technical Field

The utility model relates to an artificial intelligence technical field especially relates to an external rotor direct current brushless motor power assembly.

Background

Before the external rotor brushless direct current motor power assembly is connected to the artificial intelligent operating system, generally, a motor module needs to be assembled first, and then a power output end of the motor module is connected with a gearbox to form the power assembly so as to obtain a large output torque. When an existing outer rotor direct current brushless motor power assembly is assembled, a motor module and a gearbox need to be pre-installed respectively, then the pre-installed motor module and the pre-installed gearbox are located and installed respectively, the assembly is easily limited by field installation space, and the assembly is particularly not beneficial to maintenance. Therefore, the motor assembly is not flexible enough to be installed, and the requirement of quick installation is difficult to achieve. More importantly, once the motor module moves relative to the gearbox, the power assembly is unstable in operation and poor in reliability, and the volume of the power assembly is difficult to achieve miniaturization due to the fact that the power assembly is inconvenient to install.

Disclosure of Invention

In order to solve the relatively poor technical problem of outer rotor DC brushless motor power assembly reliability among the prior art, the utility model provides an outer rotor DC brushless motor power assembly can improve outer rotor DC brushless motor power assembly's operating stability, does benefit to the miniaturization that realizes power assembly again, also can reach the installation flexibility that improves outer rotor DC brushless motor power assembly, the purpose that the staff of being convenient for used.

The utility model discloses a following technical scheme realizes:

an outer rotor brushless DC motor power assembly comprises a motor module and a gearbox, wherein the motor module comprises a shaft sleeve, and a control circuit board, a bearing piece, a stator winding and a rotor magnetic pole which are arranged on the shaft sleeve, the inner side of the shaft sleeve is used for installing the bearing piece, the control circuit board and the stator winding can be fixed on the outer side of the shaft sleeve, the stator winding can partially accommodate the shaft sleeve, the control circuit board is used for supplying power to the stator winding, the rotor magnetic pole comprises a motor shaft which is in sliding fit with the bearing piece, so that the rotor magnetic pole can be rotatably arranged corresponding to the radial outer side of the stator winding, the shaft sleeve is used for limiting the motor shaft to axially move, so that the rotor magnetic pole is axially arranged on the first side of the bearing piece, the gearbox comprises a box body and a gear shaft component, and the box body can be detachably fixed on the shaft sleeve, so that the gear shaft assembly is arranged on the second side of the bearing piece along the axial direction corresponding to the first side and is in transmission connection with the motor shaft.

Preferably, outer rotor brushless DC motor power assembly still includes the jump ring meson, the motor shaft is including forming the joint groove of motor shaft outer cylinder, the jump ring meson can load and unload in the joint inslot, the axle sleeve is including being the body that the ring form extended setting, the inboard formation of body is used for accomodating the bearing cavity of bearing spare, the body court the terminal surface of second side can with the jump ring meson offsets, the body court the terminal surface of first side can with the rotor magnetic pole offsets to form the restriction the spacing portion that the motor shaft removed.

Preferably, the axle sleeve still include with the ring flange that the body outside links to each other, control circuit board includes the via hole, the ring flange orientation first side is equipped with the installation department, control circuit board passes through the installation department can load and unload to be fixed on the axle sleeve, just the axle sleeve passes the via hole.

Preferably, the flange plate faces the second side and is provided with a second installation part, and the box body is detachably fixed on the shaft sleeve through the second installation part and partially accommodates the flange plate.

Preferably, the box is cylindric setting, the box is including setting up the inner gear ring at the drum inboard, the gear shaft subassembly includes sun gear, a plurality of planetary gear and pivot support, the sun gear is installed on the motor shaft, in order to be synchronous to the motor shaft is rotatory, a plurality of planetary gear with the pivot support links to each other, in order to drive the pivot support is rotatory.

Preferably, the ring flange is the ring form and follows the axial extension setting, the second installation department is for forming a plurality of screw holes of ring flange periphery, the box still include with the go-between that interior ring gear links to each other, the go-between corresponds a plurality ofly the screw hole is equipped with the connecting hole that supplies threaded connection spare to pass, so that the ring flange can spiro union and at least partial embedding the box.

Preferably, the pinion subassembly still includes the second bearing piece, the box still include with the collar that the inner tooth ring links to each other, the collar is used for the card to go into the second bearing piece, the second bearing piece is used for supporting the pivot of pivot support.

Preferably, the number of the threaded holes is at least three, the threaded holes are uniformly distributed around the circumferential surface of the flange plate, and the connecting hole is arranged in a counter bore manner.

Preferably, the outer rotor dc brushless motor power assembly further includes a spacer, the spacer is mounted on the motor shaft and can be slidably connected to the clamp spring meson, and is used for adjusting a mounting gap between the clamp spring meson and the shaft sleeve.

Preferably, the body is integral with the flange.

The beneficial effects of the utility model reside in that:

the utility model provides an external rotor DC brushless motor power assembly, the axle sleeve inboard of motor module is used for installing the bearing spare, and the bearing spare links to each other with the motor shaft of rotor magnetic pole for do rotary motion to the motor shaft and support. The control circuit board and the stator winding can be fixed on the outer side of the shaft sleeve, the shaft sleeve can partially accommodate the bearing piece, the stator winding can partially accommodate the shaft sleeve after radially surrounding the shaft sleeve, and the axial installation size of the motor module is reduced. Meanwhile, the rotor magnetic poles are arranged corresponding to the radial outer sides of the stator windings to form a mounting structure partially surrounding the stator windings, the shaft sleeves and the bearing pieces, and therefore the miniaturization of the motor module is facilitated. The control circuit board is fixed on the outer side of the shaft sleeve and used for supplying power to the stator winding so as to control the starting, the stopping, the speed regulation and the like of the motor. The motor shaft is in sliding fit with the bearing piece, so that the rotor magnetic pole can be rotatably arranged corresponding to the stator winding and is used for cutting magnetic lines of force, and the rotor magnetic pole converts electric energy into output kinetic energy of the motor shaft. The shaft sleeve is used for limiting the axial movement of the motor shaft and preventing power loss. The shaft sleeve enables the rotor magnetic pole to be arranged on a first side of the bearing piece along the axial direction, so that the motor module is formed on a driving side of the first side and a driven side of the other side by taking the bearing piece as a fulcrum. The axial installation space of the motor module can be further optimized by avoiding arranging the opposite bearings at the driving side at intervals. In order to ensure the stable power output of the power module, the driven side is provided with a gearbox as a second side corresponding to the first side, and the gearbox body of the gearbox can be detachably fixed on the shaft sleeve, so that the gear shaft assembly corresponds to the driven side along the axial direction and is in transmission connection with the motor shaft. When the motor module is electrified, the rotor magnetic pole drives the gear shaft assembly to rotate through the motor shaft, and the rotor magnetic pole and the gear shaft assembly are respectively arranged on two sides of the bearing piece, so that better dynamic balance can be achieved, and the power assembly can be conveniently installed in a narrow space.

Drawings

Fig. 1 is a schematic perspective view of an external rotor dc brushless motor power assembly according to the present invention;

fig. 2 is a schematic diagram of the internal structure of the power assembly of the external rotor dc brushless motor according to the present invention;

fig. 3 is an exploded schematic view of the outer rotor dc brushless motor power assembly of the present invention.

Description of the reference symbols

10. A motor module; 11. a shaft sleeve; 110. a threaded hole; 111. a body; 112. a bearing cavity; 113. a limiting part; 114. a flange plate; 115. an installation part; 116. a second mounting portion; 12. a control circuit board; 121. a via hole; 13. a bearing member; 14. a stator winding; 15. a rotor magnetic pole; 151. a motor shaft; 152. a clamping groove; 20. a gearbox; 21. a box body; 210. connecting holes; 211. an inner gear ring; 212. a connecting ring; 213. a mounting ring; 22. a pinion assembly; 221. a sun gear; 222. a planetary gear; 223. a rotating shaft bracket; 224. a second bearing member; 30. a clamp spring meson; 40. a gasket; 50. a threaded connection.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 to 3, the present invention discloses an outer rotor dc brushless motor power assembly, which includes a motor module 10 and a transmission case 20, the motor module 10 includes a shaft sleeve 11 and a control circuit board 12 disposed on the shaft sleeve 11, a bearing member 13, a stator winding 14 and a rotor magnetic pole 15, the inner side of the shaft sleeve 11 is used for mounting the bearing member 13, the control circuit board 12 and the stator winding 14 can be fixed on the outer side of the shaft sleeve 11, and the stator winding 14 can partially accommodate the shaft sleeve 11, the control circuit board 12 is used for supplying power to the stator winding 14, the rotor magnetic pole 15 includes a motor shaft 151 slidably engaged with the bearing member 13, so that the rotor magnetic pole 15 can be rotatably disposed corresponding to the radial outer side of the stator winding 14, the shaft sleeve 11 is used for limiting the motor shaft 151 from moving axially, so that the rotor magnetic pole 15 is disposed on the first side of the bearing member 13, the gear box 20 comprises a box body 21 and a gear shaft assembly 22, wherein the box body 21 can be detachably fixed on the shaft sleeve 11, so that the gear shaft assembly 22 is arranged on the second side of the bearing piece 13 along the axial direction corresponding to the first side and is in transmission connection with the motor shaft 151.

With continued reference to fig. 1 to 3, in particular, the inside of the bushing 11 of the motor module 10 is used for mounting the bearing member 13, where the bearing member 13 may be a sliding bearing or a rolling bearing, the number of the bearing members 13 may be one or more, and the bearing member 13 is connected to the motor shaft 151 of the rotor magnetic pole 15 for supporting the motor shaft 151 in a revolving motion. The way in which the bearing member 13 is mounted inside the sleeve 11 can be varied, for example: a bearing seat for engaging the bearing member 13 is formed by providing the sleeve 11, or a bearing cavity for accommodating the bearing member 13 is formed by providing the sleeve 11, etc., which will not be described in detail herein. The control circuit board 12 and the stator winding 14 can be fixed on the outside of the sleeve 11 by pressing the sleeve 11 into the silicon steel sheet of the stator winding 14 by riveting or by coating the outside of the sleeve 11 with anaerobic glue to fix the stator winding 14 on the sleeve 11. The sleeve 11 can partially receive the bearing member 13, and the stator winding 14 radially surrounds the sleeve 11 and can partially receive the sleeve 11, reducing the axial length of the motor module 10. Meanwhile, the rotor magnetic pole 15 is arranged corresponding to the radial outer side of the stator winding 14 to form an installation structure partially surrounding the stator winding 14, the shaft sleeve 11 and the bearing piece 13, so that the motor module 10 is convenient to miniaturize. The control circuit board 12 can be fixed on the outer side of the shaft sleeve 11 in a threaded connection mode, a bonding mode and the like, the control circuit board 12 is used for supplying power to the stator winding 14, starting and stopping of the motor can be controlled, speed regulation can be achieved, and details are not given here. Through the sliding fit of the motor shaft 151 and the bearing part 13, the rotor magnetic pole 15 can be rotatably arranged corresponding to the stator winding 14 and used for cutting magnetic lines of force, and the rotor magnetic pole 15 converts electric energy into output kinetic energy of the motor shaft 151. The sleeve 11 serves to restrict the axial movement of the motor shaft 151, preventing power loss. The sleeve 11 has the rotor magnetic pole 15 disposed on a first side of the bearing member 13 in the axial direction, so that the motor module 10 is formed on a driving side of the first side and a driven side of the other side with the bearing member 13 as a fulcrum. This has the advantage that the spacing of the opposing bearings on the active side can be avoided, further optimizing the axial installation space of the electric machine module 10.

It should be particularly noted that, in order to ensure smooth power output of the motor module 10, in the present embodiment, the driven side is provided with the gearbox 20 as the second side corresponding to the first side, and the casing 21 of the gearbox 20 can be detachably fixed on the shaft sleeve 11, where the detachable fixing manner can be a snap connection or a screw connection, etc. so that the gear shaft assembly 22 axially corresponds to the driven side and is in transmission connection with the motor shaft 151. When the motor module 10 is powered on, the rotor magnetic pole 15 drives the gear shaft assembly 22 to rotate through the motor shaft 151, and the rotor magnetic pole 15 and the gear shaft assembly 22 are respectively arranged on two sides of the bearing piece 13, so that better dynamic balance can be achieved, and the power assembly can be conveniently installed in a narrow space.

With continued reference to fig. 1 to 3, the shaft sleeve 11 serves as a carrier for accommodating the bearing element 13 and the rotor magnetic pole 15 and the transmission case 20, and has more functions as a single component, in order to achieve better manufacturability, in an alternative embodiment, the outer rotor dc brushless motor power assembly further includes a snap spring meson 30, the motor shaft 151 includes a snap groove 152 formed on an outer cylindrical surface of the motor shaft 151, the snap spring meson 30 can be assembled in the snap groove 152, the shaft sleeve 11 includes a body 111 extending in a circular ring shape, a bearing cavity 112 for accommodating the bearing element 13 is formed on an inner side of the body 111, an end surface of the body 111 facing a second side can abut against the snap spring meson 30, and an end surface of the body 111 facing the first side can abut against the rotor magnetic pole 15 to form a limiting portion 113 for limiting movement of the motor shaft 151. The clamp spring meson 30 is made of a known wear-resistant polyester material, the clamp groove 152 is used for assembling and disassembling the clamp spring meson 30, so that a first limit position located at one end of the clamp spring meson 30 and a second limit position located at one end of the rotor magnetic pole 15 are formed along the axial direction of the motor shaft 151, and the limit portion 113 of the shaft sleeve 11 is used for being abutted between the first limit position and the second limit position to limit the movement of the motor shaft 151. The shaft sleeve 11 is used for forming a gap between the two limiting positions along the axial end faces of the two sides, so that the shaft sleeve 11 can move between the two limiting positions, and installation is facilitated. It should be detailed here that the body 111 extends in a circular ring shape, which refers to a general shape of a sleeve in particular, so as to facilitate the manufacturing and forming, and in actual operation, the triangle and the quadrangle extending in a circular column shape can be regarded as a simple shape change of the embodiment of the present invention. In a preferred embodiment, the outer rotor dc brushless motor power assembly further includes a spacer 40, the spacer 40 is mounted on the motor shaft 151 and can slide with the circlip medium 30 for adjusting the mounting gap between the circlip medium 30 and the shaft sleeve 11. The gasket 40 can be a bakelite gasket and/or a graphite gasket, etc., and the flexibility of mounting and teaching the powertrain can be improved by providing the gasket 40.

With continued reference to fig. 1 to 3, in view of facilitating the manufacture of the shaft sleeve 11, so as to facilitate the shaft sleeve 11 to mount the control circuit board 12, in an alternative embodiment of the present invention, the shaft sleeve 11 further includes a flange 114 connected to the outer side of the body 111, the control circuit board 12 includes a through hole 121, the flange 114 is provided with a mounting portion 115 toward the first side, the control circuit board 12 can be detachably fixed on the shaft sleeve 11 through the mounting portion 115, and the shaft sleeve 11 passes through the through hole 121. The mounting portion 115 may be a threaded hole, a slot, or the like, and accordingly, a connection hole or a buckle is disposed on the control circuit board 12, so that the control circuit board 12 can be firmly screwed or fastened to the flange 114. Through the arrangement mode, the control circuit board 12 can be conveniently installed, the using amount of glue can be reduced, and the corresponding discharge requirement of harmful substances is met. The through hole 121 may be a through hole or a notch, and the shaft sleeve 11 passing through the through hole 121 means that the body 111 passes through the through hole 121 of the control circuit board 12 in a non-contact manner, so that the structure of the motor module 10 is compact, and the operation of the motor module 10 is stable. For the purpose of further improving the compactness, in a preferred embodiment, the flange 114 is provided with a second mounting portion 116 facing the second side, and the case 21 is detachably fixed to the boss 11 via the second mounting portion 116 and partially receives the flange 114. The second mounting portion 116 may be a threaded hole, a slot, etc. and correspondingly, the box 21 is provided with a connecting hole or a buckle, etc. so that the box 21 can be firmly screwed or fastened on the flange 114. Through the arrangement mode, the gearbox 20 can be conveniently installed, the using amount of glue can be reduced, and the corresponding discharge requirement of harmful substances is met.

With continued reference to fig. 1 to 3, in order to further facilitate the manufacture of the power assembly and to miniaturize the power assembly, in an alternative embodiment of the present invention, the box 21 is cylindrical, the box 21 includes an inner ring gear 211 disposed inside the cylinder, the gear shaft assembly 22 includes a sun gear 221, a plurality of planetary gears 222 and a rotating shaft support 223, the sun gear 221 is mounted on the motor shaft 151 to rotate synchronously with the motor shaft 151, and the plurality of planetary gears 222 are connected to the rotating shaft support 223 to drive the rotating shaft support 223 to rotate. It should be particularly clarified that the planetary transmission can effectively achieve a better output torque than a general transmission, and at the same time, the volume of the transmission 20 can be significantly reduced, so that the power assembly is more compact, and miniaturization of the power assembly is facilitated. In order to reduce the overall axial installation dimension of the power assembly, in a preferred embodiment, the flange 114 is annularly arranged and extends in the axial direction, the second installation portion 116 is a plurality of threaded holes 110 formed on the circumferential surface of the flange 114, the housing 21 further includes a connecting ring 212 connected to the internal gear ring 211, and the connecting ring 212 is provided with connecting holes 210 corresponding to the plurality of threaded holes 110 for the threaded connection members 50 to pass through, so that the flange 114 can be screwed and at least partially embedded into the housing 21. The plurality of threaded holes 110 are specifically two or more, and it should be specifically stated herein that the outer diameters of the connection ring 212 and the flange plate 114 may be clearance fit, transition fit, interference fit, or the like, and of course, the loose fit of the outer diameters of the connection ring 212 and the flange plate 114 is more convenient for installation, so that the flange plate 114 can be stably embedded into the case 21, and the purpose of reducing the overall axial length of the powertrain is achieved. The flange plate 114 and the box body 21 can be fixedly connected by the threaded connecting piece 50 penetrating through the connecting hole 210 and being screwed in the threaded hole 110, so that the installation is stable and convenient, and the use amount of glue can be reduced, so that the discharge of harmful substances is correspondingly reduced. Further, the number of the threaded holes 110 is at least three, the at least three threaded holes 110 are uniformly arranged around the circumferential surface of the flange 114, and the connecting holes 210 are countersunk. Through the arrangement mode, the power assembly can run more stably, and in addition, the counter bore can be used for accommodating the threaded connecting piece 50 and plays a better hiding and protecting role.

With continued reference to fig. 1 to 3, in view of ensuring the output stability of the powertrain, in an alternative embodiment of the present invention, the gear shaft assembly 22 further includes a second bearing 224, the housing 21 further includes a mounting ring 213 connected to the inner gear ring 211, the mounting ring 213 is used for being snapped into the second bearing 224, and the second bearing 224 is used for supporting the rotating shaft of the rotating shaft bracket 223. The second bearing member 224 may be a sliding bearing or a rolling bearing, the number of the second bearing members 224 may be one or more, and the second bearing member 224 is connected to the shaft of the shaft support 223 to support the shaft support 223 for a revolving motion. The manner in which the second bearing member 224 is mounted in the housing 21 may be varied, such as: the bearing seat for engaging the second bearing member 224 is formed by providing the mounting ring 213, or the bearing cavity for accommodating the second bearing member 224 is formed by providing the mounting ring 213, so that those skilled in the art can obtain corresponding technical means without detailed description herein after learning from the embodiments and drawings of the present invention.

With continued reference to fig. 1-3, and to further facilitate installation of the powertrain, in an alternative embodiment, the body 111 is integrally formed with the flange 114. The integral arrangement mode can be casting molding or injection molding, and the arrangement mode can be convenient for obtaining the shaft sleeve 11 through one-time molding, so that the manufacturing process is reduced and optimized, and the structure of the power assembly can be more stable.

It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. The utility model provides an outer rotor DC brushless motor power assembly which characterized in that includes:

the motor module comprises a shaft sleeve, a control circuit board, a bearing piece, a stator winding and a rotor magnetic pole, wherein the control circuit board, the bearing piece, the stator winding and the rotor magnetic pole are arranged on the shaft sleeve, the bearing piece is arranged on the inner side of the shaft sleeve, the control circuit board and the stator winding can be fixed on the outer side of the shaft sleeve, the shaft sleeve can be partially accommodated in the stator winding, the control circuit board is used for supplying power to the stator winding, the rotor magnetic pole comprises a motor shaft which is in sliding fit with the bearing piece, so that the rotor magnetic pole can be rotatably arranged corresponding to the radial outer side of the stator winding, and the shaft sleeve is used for limiting the motor shaft to axially move so that the rotor magnetic pole is axially; and the number of the first and second groups,

the gearbox comprises a gearbox body and a gear shaft assembly, wherein the gearbox body can be detachably fixed on the shaft sleeve, so that the gear shaft assembly corresponds to the first side in the axial direction and is arranged on the second side of the bearing piece, and the gear shaft assembly is in transmission connection with the motor shaft.

2. The outer rotor direct current brushless motor power assembly of claim 1, further comprising a clamp spring meson, wherein the motor shaft comprises a clamp groove formed in an outer cylindrical surface of the motor shaft, the clamp spring meson is detachably mounted in the clamp groove, the shaft sleeve comprises a body extending in a circular ring shape, a bearing cavity for accommodating the bearing piece is formed in the inner side of the body, an end face of the body facing the second side can abut against the clamp spring meson, and an end face of the body facing the first side can abut against the rotor magnetic pole to form a limiting portion for limiting movement of the motor shaft.

3. The power assembly of an external rotor brushless dc motor according to claim 2, wherein the shaft sleeve further includes a flange connected to an outer side of the body, the control circuit board includes a through hole, the flange is provided with a mounting portion toward the first side, the control circuit board is detachably fixed to the shaft sleeve through the mounting portion, and the shaft sleeve passes through the through hole.

4. The power assembly of an external rotor brushless DC motor of claim 3, wherein the flange has a second mounting portion facing the second side, and the case is detachably fixed on the shaft sleeve through the second mounting portion and partially receives the flange.

5. The assembly of claim 4, wherein the housing is cylindrical, the housing includes an inner ring gear disposed inside the cylinder, the gear shaft assembly includes a sun gear, a plurality of planetary gears and a shaft support, the sun gear is mounted on the motor shaft for rotating synchronously with the motor shaft, and the plurality of planetary gears are connected to the shaft support for rotating the shaft support.

6. The power assembly of the outer rotor brushless DC motor of claim 5, wherein the flange is annularly arranged and extends axially, the second mounting portion is a plurality of threaded holes formed in the circumferential surface of the flange, the box further comprises a connecting ring connected with the inner gear ring, and the connecting ring is provided with connecting holes for threaded connecting pieces to pass through corresponding to the plurality of threaded holes, so that the flange can be screwed and at least partially embedded into the box.

7. The outer rotor dc brushless motor powertrain of claim 5, wherein the pinion assembly further includes a second bearing, the housing further includes a mounting ring connected to the inner ring gear, the mounting ring is configured to snap into the second bearing, and the second bearing is configured to support the shaft of the shaft support.

8. The power assembly of an external rotor brushless DC motor according to claim 6, wherein the number of the threaded holes is at least three, the at least three threaded holes are uniformly arranged around the circumference of the flange, and the connecting holes are countersunk.

9. The power assembly of the outer rotor DC brushless motor of claim 2, further comprising a spacer, wherein the spacer is mounted on the motor shaft and can slide with the clamp spring adapter, so as to adjust the mounting gap between the clamp spring adapter and the shaft sleeve.

10. The external rotor dc brushless motor powertrain of any of claims 3-8, wherein the body is integral with the flange.