CN106972692A - An external rotor brushless geared motor with a transmission mechanism built in a stator - Google Patents

Abstract

An outer rotor brushless gear motor with a transmission mechanism internally arranged in a stator comprises: the stator assembly comprises a stator inner cavity, an inner gear ring arranged in the stator inner cavity and an iron core arranged outside the stator inner cavity; a rotor assembly, which comprises an inner space defined by the rotor assembly, wherein a sun wheel is arranged at the axial center of the inner space, and the periphery of the inner space is provided with a magnet corresponding to the iron core; and the gear transmission assembly comprises a planet wheel and a planet carrier which are arranged in the inner cavity of the stator and matched with the sun wheel for use. The residual space in the center of the front cover of the motor is utilized, and the planetary gear train transmission assembly is arranged in the motor. Under the condition of not influencing the volume of the motor, the parts are reduced, the weight of the motor is reduced, the torque force of the motor is increased by multiple times through the conversion of the planetary gear train transmission assembly, the torque and the load capacity of the motor are increased, the effective utilization rate of the motor is fully exerted, the gravity center of the motor is more stable, and the motion inertia is smaller.

Description

An external rotor brushless geared motor with a transmission mechanism built in a stator

technical field

The invention belongs to the field of motors, in particular to an outer rotor brushless deceleration motor with a transmission mechanism built in a stator.

Background technique

The geared motor refers to the integration of the reducer and the motor. The outer rotor brushless geared motor consists of an outer rotor brushless DC motor and a gear reducer.

The structure of the traditional outer rotor brushless geared motor is that the gearbox is placed outside the motor, and the mounting surface of the motor front cover is docked with the gearbox connecting plate, and the combination works as a whole. The total height and volume of the overall motor are relatively large, and the weight is relatively heavy. Therefore, the distance between the center of gravity of the geared motor and the installation surface increases, which increases the power loss of the motor during use, increases the overall moving inertia of the motor, and increases the requirements for installation space. Due to structural factors, the use of motors is greatly limited. After a motor of the same size reaches a certain load capacity, it will no longer be able to increase the torque and its own load capacity, and the performance utilization of the motor has not been fully utilized.

However, the center of the motor front cover of the outer rotor brushless DC motor is empty, and its internal space has not been effectively utilized. The load of a single motor is relatively small, and the application field is limited.

Contents of the invention

The purpose of the present invention is to solve the defects of the prior art, and the purpose is to provide a motor that makes full use of the internal space of the motor, reduces the volume of the motor, reduces the weight, reduces the overall motion inertia of the motor, has strong load capacity, high effective utilization of motor performance, energy saving, environmental protection, and easy operation. Reliable, long-life transmission gear built-in external rotor brushless geared motor.

In order to achieve the above purpose, the following technical solutions are provided:

An external rotor brushless geared motor with a transmission mechanism built in a stator, comprising:

A stator assembly, the stator assembly includes a stator inner cavity, an inner ring gear arranged inside the stator inner cavity, and an iron core outside the stator inner cavity;

A rotor assembly, the rotor assembly includes an internal space defined by the rotor assembly, a sun gear is provided at the axial center of the internal space, and magnets corresponding to the iron core are arranged on the periphery of the internal space;

A gear transmission assembly, the gear transmission assembly includes a planetary gear and a planetary carrier placed inside the inner cavity of the stator and used in conjunction with the sun gear.

Further, the stator assembly includes: a motor front cover, an inner ring gear, an iron core and a first bearing, the motor front cover includes a cover body and a first ring body, and the cover body and the first ring body The center of the cover is provided with a first shaft hole, the first bearing is provided in the first shaft hole, and a stator inner cavity is provided on one side of the cover. The inner ring gear is arranged on the inner wall of the inner cavity of the stator close to the side of the cover, the inner ring gear is fixed in the inner cavity of the stator by a pin, and the iron core is arranged on the outer wall of the inner cavity of the stator.

Further, the iron core is fixed to the outer wall of the inner cavity of the stator by locking screws.

Further, the rotor assembly includes: a motor back cover, a combination shaft, a casing, a magnet, a sun gear and a second bearing, the motor back cover includes a second ring body and a third ring body, and the third ring body The body diameter is larger than the diameter of the second ring body, the second ring body and the third ring body are connected by a plurality of second beam bodies, and one end surface of the third ring body is provided with a plurality of protrusions around the circumference, so The casing is connected to the periphery of the third ring body, the casing and the motor back cover jointly define an internal space, and a plurality of the magnets are arranged on the inner wall of the casing and connected with the protrusions, so There is a gap between the magnet and the iron core, a second shaft hole is set in the center of the combined shaft, the second bearing is arranged in the second shaft hole, and one end of the combined shaft is a flange and fixed On one side of the second ring body, the other end of the combination shaft is a stepped shaft passing through the second ring body, and the sun gear is sleeved on the end of the stepped shaft away from the flange.

Further, the gear transmission assembly includes: a planetary carrier, a wheel shaft, a planetary wheel, a needle roller and cage assembly, and a planetary carrier flange. The planetary carrier is disc-shaped, and a circular The boss, the circular boss is arranged in the first bearing and cooperates with the first bearing, an output shaft is arranged in the center of the other end surface of the planet carrier, and the output shaft is arranged away from the end of the planet carrier A step, the output shaft extends out of the motor through the second bearing, the second bearing cooperates with the step of the output shaft, and a plurality of mounting holes are arrayed in a ring around the output shaft, the wheel shaft One end is set in the installation hole, the planetary gear is sleeved on the wheel shaft, the other end of the wheel shaft is connected to the flange of the planetary carrier, and the outer ring of the planetary wheel meshes with the inner ring gear , the inner ring of the planetary gear meshes with the sun gear sheathed on the stepped shaft.

Further, the needle roller and cage assembly is arranged between the planetary wheel and the axle.

Further, the gear transmission assembly further includes a shaft clamp and a gasket, the shaft clamp and the gasket are fitted on the circular boss, and the gasket is located on a side away from the planet carrier.

Further, the geared motor also includes a first sealing assembly, the first sealing assembly includes a baffle and a sealing cover, and the baffle is fixed on the end of the circular boss opposite to the planet carrier by screws, A circular groove is arranged on the sealing cover to accommodate the baffle, the side wall of the sealing cover is provided with threads, and the end of the first shaft hole away from the inner cavity of the stator is provided with threads to cooperate with the threads of the sealing cover. tight.

Further, the geared motor also includes a second sealing assembly, the second sealing assembly includes a bearing seat, a third bearing and a first oil seal, the bearing seat is arranged on the other end face of the planet carrier flange, the A stepped hole is set in the center of the bearing seat, the first oil seal is set in the stepped hole close to the larger diameter side of the planet carrier flange, and the third bearing is set in the stepped hole away from the planet carrier On the side with a smaller flange diameter, the stepped shaft passes through the third bearing and cooperates with the third bearing.

Further, the geared motor also includes a third sealing assembly, the third sealing assembly includes a retaining ring and a second oil seal, the retaining ring is sleeved at the place where the output shaft passes through the second shaft hole, the The second oil seal is sleeved on the outer side of the retaining ring on the output shaft, and the outer ring of the second oil seal is matched with the second shaft hole.

Beneficial effects of the present invention:

1. Small size, light weight, improve the effective utilization of motor power;

In the present invention, the planetary gear train transmission assembly is arranged in the front cover of the motor to make full use of the internal space of the front cover of the motor; at the same time, the gearbox structure is omitted, the height of the motor is greatly reduced, and the volume of the motor is reduced; the number of parts is reduced, and the weight is reduced . Due to the reduction in weight and volume, the effective power of the motor is fully utilized.

2. Compact structure, small moving inertia and large load, which improves the operation reliability of the motor;

In the present invention, the sun gear is pressed on the back cover of the motor, the inner ring gear is fixed on the inner wall of the inner cavity of the stator, the output shaft of the planetary carrier is precisely connected with the back cover of the motor through bearings, and the output shaft of the planetary carrier is not only used as the output of the transmission component of the planetary gear train Shaft, at the same time as the motor rotor shaft. This structural design reduces parts, high space utilization, and compact structure; more importantly, the weight is reduced and the center of gravity is stable, so that the overall moving inertia of the motor is reduced and the power is strengthened. Due to the characteristics of gear transmission, the load capacity is increased. Motor power utilization is improved.

3. Increase working reliability and prolong life;

Needle rollers and cage assemblies are installed between the planetary wheel and the wheel shaft, which improves the precision of mechanical transmission, enhances the transmission precision of the planetary wheel, makes the transmission of the gear smoother, the reliability of the operation is higher, and the service life is longer.

4. Use locking screws to fix the connection between the stator core and the motor front cover, which is more reliable; the traditional structure: use glue to bond the stator core and the motor front cover together, and the glue will fail due to the long-term high-temperature operation of the motor , causing the stator to loosen, affecting the operational reliability and life of the motor. The present invention mainly solves this technical defect.

5. The mechanical structure of the motor transmission is lubricated with lubricating oil to reduce mechanical wear and improve the service life and reliability of the motor. The traditional structure is lubricated with grease. After the motor runs for a period of time, the grease deteriorates and fails, and the lubrication between the various mechanical structures is lost, and the mechanical wear is intensified. The invention mainly solves this technical defect by adopting an oil seal and lubricating oil for lubrication. Since the kinematic viscosity of the lubricating oil is lower than that of the lubricating grease, the mechanical loss is greatly reduced and the effective power utilization rate of the motor is improved.

6. The motor front cover and the motor rear cover are designed with ventilation holes to improve the effective power utilization of the motor.

The transmission structure adopts a closed front motor and rear cover design. This design adopts the ventilation hole design, mainly because it improves the heat dissipation capacity of the motor. Under high-speed operation, it can fully contact the external medium, improve the heat expansion speed of the motor, and reduce the heat loss of the motor.

7. The back cover of the rotor motor and the combined shaft are designed separately, different materials can be used, and the superior characteristics of different materials can be cleverly used to ensure that the weight and strength of the motor are in the best state. The transmission structure adopts the integrated design of shaft and end cover, using aluminum alloy or alloy steel, due to the influence of material strength. The motor often breaks the shaft. In order to solve this technical defect, the present invention uses alloy steel design for the shaft, adopts split type, makes full use of the high-strength characteristics of alloy steel and the advantages of light weight of aluminum alloy, solves the phenomenon of broken shaft of the motor, and improves the reliability of the motor operation.

Description of drawings

Fig. 1 is an exploded view of the structure of the present invention;

Figure 2 is an exploded view of the structure of the stator assembly of the present invention;

Fig. 3 is an exploded view of the structure of the rotor assembly of the present invention;

Fig. 4 is an exploded view of the structure of the gear transmission assembly of the present invention.

The corresponding components of each serial number are as follows:

stator assembly 1;

Motor front cover 11;

Cover 111;

the first shaft hole 1111;

stator cavity 1112;

the first ring body 112;

the first beam body 113;

Ring gear 12;

Core 13;

first bearing 14;

rotor assembly 2;

Motor rear cover 21;

the second ring body 211;

The third ring body 212;

raised 2121;

Second beam body 213

combined shaft 22;

Second shaft hole 221

Chassis 23;

magnet 24;

Sun wheel 25

second bearing 26;

gear transmission assembly 3;

Planet carrier 31;

Circular boss 311;

output shaft 312;

steps 3121;

Mounting hole 313;

Axle 32;

Planetary gear 33;

Needle roller and cage assembly 34;

Planet carrier flange 35;

Shaft card 36;

Gasket 37;

a first sealing assembly 4;

Baffle 41;

sealing cover 42;

sealing ring 43;

second sealing assembly 5;

bearing seat 51;

third bearing 52;

The first oil seal 53;

third sealing assembly 6;

retaining ring 61;

The second oil seal 62.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the fit described in this application is shaft-hole fit, and the described specific embodiments are only used to explain the present invention, and are not intended to limit the present invention.

On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below.

As shown in Figures 1-4, an external rotor brushless geared motor with a transmission mechanism built in a stator, including: a stator assembly 1, the stator assembly 1 includes a stator inner cavity 1112 and a stator inner cavity 1112; The inner ring gear 12 and the iron core 13 outside the stator cavity 1112, the stator cavity 1112 is a sleeve-shaped structure;

A rotor assembly 2, the rotor assembly 2 includes an internal space defined by the rotor assembly 2, a sun gear 25 is provided at the axial center of the internal space, and magnets 24 corresponding to the iron core 13 are arranged on the peripheral side of the internal space;

A gear transmission assembly 3 , the gear transmission assembly 3 includes a planetary gear 33 and a planetary carrier 31 placed inside the inner cavity 1112 of the stator and used in conjunction with the sun gear 25 .

The stator assembly 1 includes: a motor front cover 11, an inner ring gear 12, an iron core 13 and a first bearing 14. The motor front cover 11 includes a cover body 111 and a first ring body 112. The cover body 111 It is connected with the first ring body 112 through a plurality of first beams 113, a first shaft hole 1111 is set in the center of the cover body 111, and the first bearing 14 is set in the first shaft hole 1111, so One side of the cover body 111 is provided with a stator inner cavity 1112, the inner ring gear 12 is arranged on the inner wall of the stator inner cavity 1112 close to the side of the cover body 111, and the inner ring gear 12 is fixed on the stator inner cavity 1112 with a pin Inside, the iron core 13 is fixed on the outer wall of the inner cavity 1112 of the stator by locking screws.

The rotor assembly 2 includes: a motor rear cover 21, a combined shaft 22, a casing 23, a magnet 24, a sun gear 25 and a second bearing 26, and the motor rear cover 21 includes a second ring body 211 and a third ring body 212, the diameter of the third ring body 212 is larger than the diameter of the second ring body 211, the second ring body 211 and the third ring body 212 are connected by a plurality of second beam bodies 213, and the third ring body One end surface of the body 212 is provided with a plurality of protrusions 2121 around the circumference, the casing 23 is connected with the periphery of the third ring body 212, the casing 23 and the motor rear cover 21 jointly define an inner space, and a plurality of The magnet 24 is arranged on the inner wall of the casing 23 and connected with the protrusion 2121, there is a gap between the magnet 24 and the iron core 13, and a second shaft hole 221 is arranged in the center of the combined shaft 22, The second bearing 26 is disposed in the second shaft hole 221, one end of the combined shaft 22 is a flange and is fixed on one side of the second ring body 211, and the other end of the combined shaft 22 is a stepped shaft. Through the second ring body 211 , the sun gear 25 is sheathed on the end of the stepped shaft away from the flange, and the sun gear 25 cooperates with the gear transmission assembly 3 .

The gear transmission assembly 3 includes: a planetary carrier 31, a wheel shaft 32, a planetary wheel 33, a needle roller and cage assembly 34, and a planetary carrier flange 35. The planetary carrier 31 is disc-shaped, and one end surface of the planetary carrier 31 A circular boss 311 is arranged on it, and the circular boss 311 is arranged in the first bearing 14 and cooperates with the first bearing 14. An output shaft 312 is arranged in the center of the other end surface of the planet carrier 31, The output shaft 312 is provided with a step 3121 away from the end of the planet carrier 31, and the output shaft 312 extends out of the motor through the second bearing 26, and the step 3121 between the second bearing 26 and the output shaft 312 Cooperate, with the output shaft 312 as the center, a plurality of mounting holes 313 are arrayed in a circular array, one end of the wheel shaft 32 is arranged in the mounting hole 313, the planetary gear 33 is sleeved on the wheel shaft 32, and the planetary gear 33 and the wheel shaft 32 is provided with the needle roller and cage assembly 34, the other end of the wheel shaft 32 is connected to one end face of the planet carrier flange 35, the outer ring of the planet wheel 33 is connected to the ring gear 12, the inner ring of the planetary gear 33 meshes with the sun gear 25 sleeved on the stepped shaft, and the outer ring of the planetary gear 33 is outside the virtual ring gear formed by a plurality of planetary gears 33 in an annular array. The inner ring of the planetary gear 33 is the inner side of the virtual ring gear formed by a plurality of planetary gears 33 in an annular array. The gear transmission assembly 3 also includes a shaft clamp 36 and a gasket 37, and the shaft clamp 36 and the gasket 37 are sleeved on the On the circular boss 311, the gasket 37 is located on the side away from the planet carrier 31, and the gear transmission assembly 3 is lubricated with lubricating oil.

The geared motor also includes a first sealing assembly 4, a second sealing assembly 5 and a third sealing assembly 6, the first sealing assembly 4 includes but not limited to a baffle 41 and a sealing cover 42, and the baffle 41 adopts screws Fixed on the end of the circular boss 311 opposite to the planet carrier 31 to fix the first bearing 14, the sealing cover 42 is provided with a circular groove to accommodate the baffle 41, the sealing cover The side wall of 42 is provided with threads, and the end of the first shaft hole 1111 away from the inner cavity of the stator 1112 is provided with threads to cooperate with the threads of the sealing cover 42 to be tightened, and the sealing cover 42 is screwed to the first shaft hole 1111 A sealing ring 43 can be arranged on the inner side of the connection, and the sealing cover 42 presses the sealing ring 43 tightly. The second sealing assembly 5 includes but not limited to a bearing seat 51, a third bearing 52 and a first oil seal 53. The bearing seat 51 is arranged on the other end surface of the planet carrier flange 35, and the center of the bearing seat 51 is arranged A stepped hole, the first oil seal 53 is arranged in the stepped hole close to the larger diameter side of the planet carrier flange 35, the third bearing 52 is arranged in the stepped hole away from the planet carrier method The side of the flange 35 with a smaller diameter, the stepped shaft passes through the third bearing 52 and cooperates with the third bearing 52 . The third sealing assembly 6 includes but is not limited to a retaining ring 61 and a second oil seal 62 , the retaining ring 61 is sleeved at the place where the output shaft 312 passes through the second shaft hole 221 , and the second oil seal 62 It is sleeved on the outer side of the retaining ring 61 on the output shaft 312, and the outer ring of the second oil seal 62 is matched with the second shaft hole 221. The structure of the above-mentioned sealing components is only one embodiment of the present invention. The setting position of the sealing ring 43 is not limited, and it can be set at any position to achieve sealing, such as the outside of the shaft hole. Any sealing form or deformation of the sealing form should be within the protection scope of the present invention. The above-mentioned sealing assembly can be effectively waterproof, moisture-proof and dust-proof.

The beneficial effect of the present invention is that the remaining space in the center of the motor front cover is fully utilized, and the planetary gear train transmission assembly is built into the motor. This structural design reduces the parts and weight of the motor without affecting the volume of the motor itself, increases the torque of the motor several times through the conversion of the planetary gear train transmission components, increases the torque and load capacity of the motor, and improves the effective utilization of the motor. Give full play to make the center of gravity of the motor more stable and the moment of inertia smaller.

Claims (10)

1. An outer rotor brushless geared motor with a transmission mechanism built into the stator, characterized in that it includes: A stator assembly (1), the stator assembly (1) includes a stator inner cavity (1112), an inner ring gear (12) arranged inside the stator inner cavity (1112) and an iron core outside the stator inner cavity (1112) (13); A rotor assembly (2), the rotor assembly (2) includes an internal space defined by the rotor assembly (2), a sun gear (25) is provided at the axial center of the internal space, and the inner space is provided with The corresponding magnet (24) of iron core (13); A gear transmission assembly (3), the gear transmission assembly (3) includes a planetary gear (33) and a planetary carrier (31) placed inside the inner cavity of the stator (1112) and used in conjunction with the sun gear (25). 2. The external rotor brushless geared motor with the transmission mechanism built in the stator according to claim 1, characterized in that, the stator assembly (1) includes: a motor front cover (11), an inner ring gear (12), an iron Core (13) and first bearing (14), described motor front cover (11) comprises a cover body (111) and a first ring body (112), and described cover body (111) and first ring body ( 112) are connected by a plurality of first beams (113), the center of the cover (111) is provided with a first shaft hole (1111), and the first bearing (14) is arranged in the first shaft hole (1111), a stator inner cavity (1112) is arranged on one side of the cover (111), and the inner ring gear (12) is arranged on the inner wall of the stator inner cavity (1112) close to the side of the cover (111) , the inner ring gear (12) is fixed in the inner cavity of the stator (1112) with a pin, and the iron core is arranged on the outer wall of the inner cavity of the stator (1112). 3. The outer-rotor brushless geared motor with the transmission mechanism built in the stator according to claim 2, characterized in that the iron core (13) is fixed to the outer wall of the inner cavity (1112) of the stator by locking screws. 4. The outer rotor brushless geared motor with the transmission mechanism built in the stator according to claim 3, characterized in that, the rotor assembly (2) includes: motor rear cover (21), combined shaft (22), casing (23), magnet (24), sun gear (25) and second bearing (26), described motor back cover (21) comprises a second ring body (211) and the 3rd ring body (212), described The diameter of the third ring body (212) is larger than the diameter of the second ring body (211), and the second ring body (211) and the third ring body (212) are connected by a plurality of second beam bodies (213) , one end surface of the third ring body (212) is provided with a plurality of protrusions (2121) around the circumference, the casing (23) is connected with the periphery of the third ring body (212), and the casing (23) An inner space is jointly defined with the motor rear cover (21), and a plurality of the magnets (24) are arranged on the inner wall of the casing (23) and connected with the protrusion (2121), and the magnets (24) There is a gap between the iron core (13), a second shaft hole (221) is set in the center of the combined shaft (22), and the second bearing (26) is set in the second shaft hole (221 ), one end of the combination shaft (22) is a flange and is fixed on one side of the second ring body (211), and the other end of the combination shaft (22) is a stepped shaft passing through the second ring body ( 211), the sun gear (25) is sheathed on the end of the stepped shaft away from the flange. 5. The outer-rotor brushless geared motor with the transmission mechanism built in the stator according to claim 4, characterized in that, the gear transmission assembly (3) includes: a planetary carrier (31), a wheel shaft (32), a planetary wheel ( 33), needle roller and cage assembly (34) and planet carrier flange (35), the planet carrier (31) is disc-shaped, and a circular boss ( 311), the circular boss (311) is arranged in the first bearing (14) and cooperates with the first bearing (14), and an output shaft is arranged in the center of the other end surface of the planet carrier (31) (312), the output shaft (312) is provided with a step (3121) away from the end of the planet carrier (31), and the output shaft (312) extends out of the motor through the second bearing (26), so The second bearing (26) cooperates with the step (3121) of the output shaft (312), and a plurality of mounting holes (313) are arrayed in a circular array with the output shaft (312) as the center, and one end of the wheel shaft (32) is provided In the mounting hole (313), the planetary wheel (33) is sheathed on the wheel shaft (32), and the other end of the wheel shaft (32) is connected to one end face of the planet carrier flange (35), The outer ring of the planetary gear (33) meshes with the inner ring gear (12), and the inner ring of the planetary wheel (33) meshes with the sun gear (25) sleeved on the stepped shaft. 6. The outer rotor brushless geared motor with the transmission mechanism built in the stator according to claim 5, characterized in that the needle roller and the cage are arranged between the planetary wheel (33) and the wheel shaft (32) Components (34). 7. The outer rotor brushless geared motor with the transmission mechanism built in the stator according to claim 5, characterized in that, the gear transmission assembly (3) also includes a shaft clamp (36) and a gasket (37), the A shaft clamp (36) and a spacer (37) are threaded on the circular boss (311), and the spacer (37) is located on a side away from the planet carrier (31). 8. The outer rotor brushless geared motor with the transmission mechanism built in the stator according to claim 5, characterized in that, the geared motor also includes a first sealing assembly (4), and the first sealing assembly (4) includes A baffle (41) and a sealing cover (42), the baffle (41) is fixed on the end of the circular boss (311) opposite to the planet carrier (31) by screws, the sealing cover (42 ) is provided with a circular groove to accommodate the baffle (41), the side wall of the sealing cover (42) is provided with threads, and the end of the first shaft hole (1111) away from the inner cavity of the stator (1112) is provided with threads Tighten with the screw thread of the sealing cover (42). 9. The outer rotor brushless geared motor with the transmission mechanism built in the stator according to claim 5, characterized in that, the geared motor also includes a second sealing assembly (5), and the second sealing assembly (5) includes The bearing seat (51), the third bearing (52) and the first oil seal (53), the bearing seat (51) is arranged on the other end face of the planet carrier flange (35), and the center of the bearing seat (51) A stepped hole is set, the first oil seal (53) is set in the stepped hole close to the larger diameter side of the planet carrier flange (35), and the third bearing (52) is set in the stepped hole On the side away from the smaller diameter side of the planet carrier flange (35), the stepped shaft passes through the third bearing (52) and cooperates with the third bearing (52). 10. The outer rotor brushless geared motor with the transmission mechanism built in the stator according to claim 5, characterized in that, the geared motor also includes a third sealing assembly (6), and the third sealing assembly (6) includes A retaining ring (61) and a second oil seal (62), the retaining ring (61) is sleeved at the place where the output shaft (312) passes through the second shaft hole (221), and the second oil seal (62 ) is sleeved on the outer side of the upper retaining ring (61) of the output shaft (312), and the outer ring of the second oil seal (62) is matched with the second shaft hole (221).