US-20260128629-A1 - MINIATURE INTEGRATED HIGH-REDUCTION-RATIO POWER DEVICE INTEGRATED WITHIN MINIATURE OUTER ROTOR

US20260128629A1US 20260128629 A1US20260128629 A1US 20260128629A1US-20260128629-A1

Abstract

A miniature high-reduction-ratio power device integrated within an outer rotor is provided, which includes a motor rotor, a rotor permanent magnet, a stator winding, a stator core, an internal fixing casing and an end cover. A primary sun gear is connected with a rotor output shaft of the motor rotor. Multiple primary planetary gears are meshed outside the primary sun gear, and a primary planetary gear carrier is connected with the primary planetary gears. A secondary sun gear is connected with the primary planetary gear carrier. Multiple secondary planetary gears are meshed outside the secondary sun gear, and the secondary planetary carrier is connected with the secondary planetary gears. A tertiary sun gear is connected with the secondary planetary carrier. Multiple tertiary planetary gears are meshed outside the tertiary sun gear, and a tertiary planetary carrier is connected with the multiple tertiary planetary gears.

Inventors

Hongxing Wu
Weiming SHEN
Hui You
Peng Gao
JiaXin FAN
Xianping Liu
Yue Wu
Wei Shen

Assignees

Fuyao University of Science and Technology

Dates

Publication Date: 20260507
Application Date: 20251007
Priority Date: 20241106

Claims (5)

1 . A miniature high-reduction-ratio power device integrated within an outer rotor, comprising a motor rotor ( 1 ), a rotor permanent magnet ( 2 ), a stator winding ( 3 ), a stator core ( 4 ), an internal fixing casing ( 5 ), an end cover ( 20 ) and a straight end cover opening ( 9 ); wherein the internal fixing casing ( 5 ) is fixedly connected with the end cover ( 20 ), the motor rotor ( 1 ) is rotatably connected with the internal fixing casing ( 5 ), the motor rotor ( 1 ) is provided with a rotor output shaft ( 7 ), a primary sun gear ( 12 ) is fixedly connected with the rotor output shaft ( 7 ) through a first D-shaped shaft hole, a plurality of primary planetary gears ( 10 ) are meshed outside the primary sun gear ( 12 ) in an encircling manner, and a primary planetary gear carrier ( 13 ) is rotatably connected with the plurality of primary planetary gears ( 10 ), a secondary sun gear ( 17 ) is fixedly connected with an output shaft of the primary planetary gear carrier ( 13 ) through a second D-shaped shaft hole, a plurality of secondary planetary gears ( 11 ) are meshed outside the secondary sun gear ( 17 ) in an encircling manner, a secondary planetary gear carrier ( 15 ) is rotatably connected with the plurality of secondary planetary gears ( 11 ), a tertiary sun gear ( 18 ) is fixedly connected with an output shaft of the secondary planetary gear carrier ( 15 ) through a third D-shaped shaft hole, and a plurality of tertiary planetary gears ( 19 ) are meshed outside the tertiary sun gear ( 18 ) in an encircling manner, a tertiary planetary carrier ( 16 ) is rotatably connected with the plurality of tertiary planetary gears ( 19 ), and the tertiary planetary carrier ( 16 ) is provided with a planetary reducer output shaft ( 21 ).
2 . The miniature high-reduction-ratio power device integrated within the outer rotor according to claim 1 , wherein the motor rotor ( 1 ) is provided with a bearing chamber ( 6 ), the bearing chamber ( 6 ) is provided with a first bearing ( 8 ), and the motor rotor ( 1 ) is rotatably connected with the internal fixing casing ( 5 ) by means of the first bearing ( 8 ).
3 . The miniature high-reduction-ratio power device integrated within the outer rotor according to claim 1 , wherein second bearings ( 14 ) are disposed respectively between the plurality of primary planetary gears ( 10 ) and the primary planetary gear carrier ( 13 ), between the plurality of secondary planetary gears ( 11 ) and the secondary planetary gear carrier ( 15 ) and between the plurality of tertiary planetary gears ( 19 ) and the tertiary planetary gear carrier ( 16 ).
4 . The miniature high-reduction-ratio power device integrated within the outer rotor according to claim 1 , wherein a third bearing ( 22 ) is disposed between the planetary reducer output shaft ( 21 ) and the end cover ( 20 ).
5 . The miniature high-reduction-ratio power device integrated within the outer rotor according to claim 1 , wherein an inner wall of the internal fixing casing ( 5 ) is provided with inner ring teeth ( 23 ), and the plurality of first planetary gears ( 10 ), the plurality of second planetary gears ( 11 ) and the plurality of tertiary planetary gears ( 19 ) are all meshed with the inner ring teeth ( 23 ).

Description

CROSS-REFERENCE TO RELATED APPLICATION This patent application claims the benefit and priority of Chinese Patent Application No. 202411573301.3, entitled “MINIATURE INTEGRATED HIGH-REDUCTION-RATIO POWER DEVICE INTEGRATED WITHIN MINIATURE OUTER ROTOR” filed on Nov. 6, 2024, the disclosure of which is incorporated by reference herein in its entirety as part of the present application. TECHNICAL FIELD The present disclosure relates to the technical field of mechanical engineering automation, and in particular to a miniature high-reduction-ratio power device integrated within an outer rotor. BACKGROUND The device including a motor and a reducer has a very wide application range, for example, these devices are all popular in the fields such as industrial automatic production lines, robotics, automotive transmission systems, and household appliances. By using the reducer, the speed and the output torque of the motor can be effectively adjusted to allow the machine to operate under a wider range of conditions and improve efficiency and performance. Such devices may be divided into two main portions: the motor and the reducer. The conventional device including a motor and reducer is typically a structure in which the motor and the reducer are connected in series, the reducer is mounted on an outer side of the motor, and this traditional structure is an elongated structure and is not conducive to high-integration scenarios, and especially in a scenario where a robot joint and a volume are restrained. Therefore, the present disclosure provides a miniature high-reduction-ratio power device integrated within an outer rotor to solve such a problem. SUMMARY The embodiments aim to provide a miniature high-reduction-ratio power device integrated within an outer rotor, in order to solve a problem that the conventional device including the motor and the reducer is typically a structure in which the motor and the reducer are connected in series, and the reducer is mounted on an outer side of the motor, which is not conducive to high-integration scenarios. To achieve the above objective, the present disclosure provides the following technical solutions. A basic technical solution of the present disclosure is as follows. A miniature high-reduction-ratio power device integrated within an outer rotor includes a motor rotor, a rotor permanent magnet, a stator winding, a stator core, an internal fixing casing, an end cover and a straight end cover opening. The internal fixing casing is fixedly connected with the end cover. The motor rotor is rotatably connected with the internal fixing casing. The motor rotor is provided with a rotor output shaft. a primary sun gear is fixedly connected with the rotor output shaft through a first D-shaped shaft hole. Multiple primary planetary gears are meshed outside the primary sun gear in an encircling manner. A primary planetary gear carrier is rotatably connected with the multiple primary planetary gears. A secondary sun gear is fixedly connected with an output shaft of the primary planetary gear carrier through a second D-shaped shaft hole. Multiple secondary planetary gears are meshed outside the secondary sun gear in an encircling manner. A secondary planetary gear carrier is rotatably connected with the multiple secondary planetary gears. a tertiary sun gear is fixedly connected with an output shaft of the secondary planetary gear carrier through a third D-shaped shaft hole. Multiple tertiary planetary gears are meshed outside the tertiary sun gear in an encircling manner. A tertiary planetary carrier is rotatably connected with the multiple tertiary planetary gears. The tertiary planetary carrier is provided with a planetary reducer output shaft. The principle of the basic technical solution is as follows. A rotor shaft permanent magnet drives the motor rotor to rotate, the rotor output shaft drives the primary sun gear to rotate, the primary sun gear drives the primary planetary gears to revolve while the primary planetary gear performs a circumferential movement about the axis of the primary sun gear, and thus the primary planetary gear carrier drives the secondary sun gear to rotate, so as to achieve the purpose of primary speed reduction. The secondary sun gear drives the secondary planetary gears to revolve while the secondary planetary gear performs a circumferential movement about the axis of the secondary sun gear, and thus the secondary planetary gear carrier drives the tertiary sun gear to rotate, so as to achieve the purpose of secondary speed reduction. The tertiary sun gear drives the tertiary planetary gears to revolve while the tertiary planetary gear performs a circumferential movement about the axis of the tertiary sun gear, and thus the tertiary planetary carrier drives the planetary reducer output shaft to rotate, so as to achieve the purpose of tertiary speed reduction. The basic technical solution has the following beneficial effects. By means of the cooperation of th