CN112072849A

CN112072849A - Coaxial speed reducing motor

Info

Publication number: CN112072849A
Application number: CN202011028443.3A
Authority: CN
Inventors: 林中尉
Original assignee: Nanjing Amtf Electronic Co ltd
Current assignee: Nanjing Amtf Electronic Co ltd
Priority date: 2020-09-26
Filing date: 2020-09-26
Publication date: 2020-12-11

Abstract

The patent provides a coaxial gear motor, its simple structure is reliable, and axial dimension is short, specially adapted to the higher occasion of axial dimension requirement, and it has great drive ratio, and transmission efficiency is high. The motor comprises a motor consisting of a rotor and a stator, a fly-planetary gear reducer consisting of a sun gear, a planet gear and a planet carrier, wherein the axis of a first sun gear fixed on a shell is superposed with the axis of a second sun gear rotating relative to the shell; each group of planet wheels comprises a first planet wheel and a second planet wheel which are respectively meshed with the first sun wheel and the second sun wheel, and the first planet wheel and the second planet wheel are coaxially fixed and rotatably arranged on the planet carrier; the axis of a motor for rotating the rotor, the axis of a second sun gear serving as an output gear and the axis for rotating the planet carrier are coaxial; in the axial direction of the motor, the rotor is positioned on one side of the planet wheel; the carrier has an extension ring extending to a rotor side in the motor axial direction, and the rotor is fixed to the extension ring.

Description

Coaxial speed reducing motor

Technical Field

The patent relates to a gear motor, specifically speaking, a gear motor that motor and reduction gear are coaxial.

Background

The motor generally belongs to the power part of high-speed rotation, and when using, most of the circumstances need to use the reduction gear to reduce the rotational speed of motor, increase the moment of torsion to the application needs of adaptation. The general speed reducer is a parallel shaft speed reducer or a speed reducer with an internal gear, wherein the speed reducer has a simple structure and low cost, but has a large volume, and the speed reducer has a small volume and high cost of the internal gear and is difficult to machine. Therefore, a speed reducing motor with simple structure, small volume and good manufacturability is needed.

Disclosure of Invention

The coaxial speed reducing motor is simple and reliable in structure, short in axial dimension, particularly suitable for occasions with high requirements on the axial dimension, compact in structure, small in size, light in weight, high in transmission ratio, few in transmission links (only two-stage gear meshing), high in transmission efficiency and low in cost.

In order to achieve the above object, the coaxial speed reduction motor described in this patent has a housing, a stator fixed on the housing, a rotor, a sun gear, a planet gear, and a planet carrier rotatably disposed on the housing, wherein the rotor and the stator form a motor, and the sun gear, the planet gear, and the planet carrier form a planetary gear reducer, which has two sun gears with coincident axes, that is, a first sun gear fixed on the housing and a second sun gear rotating relative to the housing; the planetary gears are at least one group, each group of planetary gears comprises a first planetary gear and a second planetary gear which are respectively meshed with the first sun gear and the second sun gear, and the first planetary gear and the second planetary gear are coaxially fixed and rotatably arranged on the planetary carrier; the axis of a motor for rotating the rotor, the axis of a second sun gear serving as an output gear and the axis for rotating the planet carrier are coaxial; in the axial direction of the motor, the rotor is positioned on one side of the planet wheel; the carrier has an extension ring extending to a rotor side in the motor axial direction, and the rotor is fixed to the extension ring.

In the coaxial speed reduction motor, the first planet wheel and the second planet wheel are combined into a whole, and the coaxial speed reduction motor is an integral gear.

In the above coaxial reduction motor, the first planetary gear and the second planetary gear are two gears having different gear parameters.

The planetary wheel sets of the coaxial speed reducing motor are provided with a plurality of groups, and the planetary wheel sets of each group are uniformly distributed on the same circumference.

In the above coaxial gear motor, the motor is an inner rotor motor, and the stator is located at the outer periphery of the rotor.

In the above coaxial gear motor, the motor is an outer rotor motor, and the rotor is located at the outer peripheral part of the stator.

In the above coaxial speed reduction motor, the motor is a disk motor, and the stator is located on one side of the rotor in the axial direction of the motor.

The beneficial effect of this patent: the speed reducer in this patent comprises two sun gears and a planet carrier and at least one planetary gear set, and the planet carrier has along the extension ring of motor axial extension, and electric motor rotor installs on the extension ring of planet carrier, and motor stator fixes on the casing. The extension ring may be considered to be part of the planet carrier.

The first sun gear far away from the motor is fixed (fixedly connected to the shell), and the second sun gear close to the motor rotor is an output gear of the speed reducer. Because the rotor is directly fixed on the planet carrier, the structure is simple and reliable, the axial size is short, and the planetary gear set is particularly suitable for occasions with higher requirements on the axial size. The speed reducer has no internal gear, so the cost is low and the precision is high.

The reducer with the structure has the advantages of compact structure, realization of great transmission ratio transmission, few transmission links (only two-stage gear engagement), high transmission efficiency and low cost, and compared with the traditional parallel shaft gear reducer, the reducer has small volume and light weight, and compared with a planetary gear train reducer consisting of a sun gear, a planet gear and an inner gear ring, the reducer is low in cost and small in process difficulty because the inner gear ring is not used.

Drawings

FIG. 1 is a schematic diagram of a coaxial gear motor driven by an inner rotor motor;

FIG. 2 is a schematic diagram of an outer rotor motor driven coaxial gear motor;

fig. 3 is a schematic diagram of a disc motor driven coaxial gear motor.

In the figure, a housing 100, a motor 1, a stator 11, a rotor 12,

the speed reducer 2, the first sun gear 21, the second sun gear 22, the first planet gear 23, the second planet gear 24, the planet carrier 25, the planet gear shaft 26 and the extension ring 27.

Detailed Description

Example 1:

referring to fig. 1, the coaxial speed-reducing motor includes a motor 1 mainly composed of a housing 100, a stator 11 fixed on the housing, and a rotor 12, and a planetary gear reducer 2 mainly composed of a first sun gear 21, a second sun gear 22, a first planetary gear 23, a second planetary gear 24, and a planet carrier 25. The housing 100 is common to the motor and the reducer, and can also be considered as a component of the reducer.

The first planet wheel 23 and the second planet wheel 24 are respectively meshed with the first sun wheel 21 and the second sun wheel 22, are coaxially fixed and are rotatably arranged on a planet wheel shaft 26 through bearings to form a planet wheel set. The planetary gear shaft 26 is fixed to the carrier 25. The first sun gear 21 fixed to the housing 100 and the second sun gear 22 rotated relative to the housing by a bearing are axially overlapped.

The axis of the rotor rotation is the motor axis, and the motor axis, the second sun gear axis and the planet carrier rotation axis are all coaxial. The rotor 12 is located on one side of the planet wheels in the direction of the motor axis. The carrier 25 has an extension ring 27 extending to the rotor inner circumferential portion toward the rotor side in the motor axial direction, and the extension ring 27 may be regarded as a part of the carrier 25. The inner periphery of the rotor 12 is connected to an extension ring 27.

In the coaxial reduction motor, the first planet wheel 23 and the second planet wheel 24 can be an integral gear which is combined into a whole, or can be two gears with different gear parameters. The planetary wheel set can have a plurality of groups, and each group of planetary wheel set is uniformly distributed on the same circumference.

The stator 11 in the motor 1 is located at the outer peripheral portion of the rotor 12, and the motor 1 is an inner rotor motor. The outer circumference of the stator 11 is fixedly coupled to the housing 100.

Example 2:

the main difference between example 2 and example 1 is that: the motor in embodiment 2 is an external rotor motor, the rotor 12 of the motor is located at the outer periphery of the stator 11, and the end of the stator 11 far away from the planet wheel is fixedly connected with the housing 100; of course, since the stator 11 is inside the rotor 12, the extension ring 27 in embodiment 2 is located between the stator and the rotor.

Example 3:

the main difference between example 3 and example 1 is that: the motor in embodiment 3 is a disc motor, and the rotor 12 is located between the stator 11 and the planet wheel in the motor axial direction; the periphery of the stator 11 or/and the end far away from the planet wheels are fixedly connected with the shell 100; the extension ring 27 in embodiment 3 is located at both the inner peripheral portions of the stator and the rotor.

With the above embodiments 1, 2 or 3, the extension ring 27 (or the planet carrier 25) is rotatably disposed on the housing 100 through a bearing, and when the rotor 12 rotates, the extension ring and the planet carrier 25 are driven to rotate together around the motor axis. Since the first sun gear 21 is fixed to the housing 100 and cannot rotate, the first planet gear 23 rotates around the planet gear shaft 26, and since the second planet gear 24 is fixed coaxially with the first planet gear 23, the second planet gear 24 also rotates synchronously with the first planet gear 23, and the second sun gear 22 meshed with the second planet gear 24 rotates, so that power output is realized.

The type and the structural form of the motor do not affect the protection scope of the patent claims;

the number of the planetary wheel sets of the reducer is at least one set, and can also be multiple sets, which does not affect the protection scope of the claims of the patent;

the positioning structure of the two sun gears does not affect the protection scope of the claims of the patent.

Claims

1. Coaxial gear motor has the casing, fixes stator, rotor, sun gear, planet wheel on the casing, rotates the planet carrier that sets up on the casing, and the motor is constituteed to rotor and stator, and sun gear, planet wheel and planet carrier constitute planetary gear reducer, characterized by: the sun gear comprises two sun gears with coincident axes, namely a first sun gear fixed on the shell and a second sun gear rotating relative to the shell; the planetary gears are at least one group, each group of planetary gears comprises a first planetary gear and a second planetary gear which are respectively meshed with the first sun gear and the second sun gear, and the first planetary gear and the second planetary gear are coaxially fixed and rotatably arranged on the planetary carrier; the axis of a motor for rotating the rotor, the axis of a second sun gear serving as an output gear and the axis for rotating the planet carrier are coaxial; in the axial direction of the motor, the rotor is positioned on one side of the planet wheel; the carrier has an extension ring extending to a rotor side in the motor axial direction, and the rotor is fixed to the extension ring.

2. The coaxial gear motor according to claim 1, wherein: the first planet wheel and the second planet wheel are combined into a whole, and the whole gear is formed.

3. The coaxial gear motor according to claim 1, wherein: the first planet gear and the second planet gear are two gears having different gear parameters.

4. The coaxial gear motor according to claim 1, wherein: the planetary wheel sets are provided with a plurality of groups, and the planetary wheel sets of each group are uniformly distributed on the same circumference.

5. The coaxial gear motor according to claim 1, wherein: the motor is an inner rotor motor, and the stator is positioned on the periphery of the rotor.

6. The coaxial gear motor according to claim 1, wherein: the motor is an outer rotor motor, and the rotor is positioned on the periphery of the stator.

7. The coaxial gear motor according to claim 1, wherein: the motor is a disc motor, and the stator is positioned on one side of the rotor in the axial direction of the motor.