CN214274368U

CN214274368U - Motor with built-in gear difference planetary gear box

Info

Publication number: CN214274368U
Application number: CN202120087220.8U
Authority: CN
Inventors: 张国华; 李雪华; 张凯; 张建文
Original assignee: Shenzhen Hengdrive Electric Co ltd
Current assignee: Shenzhen Hengdrive Motor Co ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-09-24
Anticipated expiration: 2031-01-13

Abstract

An electric machine with an internal differential planetary gear gearbox, comprising: set up motor stator subassembly and motor rotor subassembly in the motor casing, motor rotor subassembly includes: the motor comprises a motor shaft, a sun gear, a first planet gear, a second planet gear, a first inner gear ring and a second inner gear ring; the sun wheel is arranged on a motor shaft, the motor shaft drives the sun wheel to rotate, the sun wheel is meshed with a first planet wheel arranged on a planet carrier to drive the first planet wheel to rotate, the first planet wheel is meshed with a first inner gear ring, the planet carrier is driven to rotate due to the fact that the first inner gear ring is fixed, meanwhile, the first planet wheel and a second planet wheel are fixed together, the second planet wheel is meshed with a second inner gear ring, under the rotation of the first planet wheel and the planet carrier, the second inner gear ring rotates, and an output shaft of a speed reducing motor arranged on a boss of the second inner gear ring rotates. Compared with the traditional speed reducing mechanism, the device has the advantages of few stages, large speed reducing ratio, stable transmission, small volume, low noise and simple assembly.

Description

Motor with built-in gear difference planetary gear box

Technical Field

The utility model relates to the technical field of motors, concretely relates to motor of built-in poor planet wheel gear case of tooth.

Background

The existing gear box structure is composed of three parts, namely a rigid gear, a flexible gear and a wave generator, wherein a moving deformation wave is generated in a flexible gear component under the action of the wave generator and is meshed with the teeth of the rigid gear, so that the aim of transmission is fulfilled.

Taking a double wave harmonic gear as an example, the tooth difference between the flexible gear and the rigid gear is 2, the process of transmitting force and motion is shown in the figure. When the rotation angle of the wave generator is 0 degree, the teeth of the flexible gears at the two ends of the long shaft are just completely engaged with the teeth of the rigid gear, the teeth of the flexible gears at the short shaft are completely engaged, and the gear teeth of the flexible gears in other areas between the long shaft and the short shaft are in a transition state of engagement and engagement. When the rigid wheel is fixed, the wave generator is input, and the flexible wheel is output, the wave generator rotates clockwise, the flexible wheel generates elastic deformation under the action of the wave generator, and the position of the meshing teeth of the flexible wheel and the rigid wheel also rotates clockwise. After the wave generator was rotated 180 ° in the clockwise direction, the flexspline rotated only 1 tooth in the counterclockwise direction. After the wave generator rotates 360 °, the flexspline moves 2 teeth in the counterclockwise direction because the rigid spline has 2 more teeth than the flexspline. By analogy, the gear teeth are meshed in and out through the continuous elastic deformation of the flexible gear, and the harmonic gear generates output torque and rotary motion.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the application provides a gear difference planetary gear box with a new structure, which is internally arranged in a motor, so that the whole transmission of a speed reducing motor is more stable, the structure is simple and compact, the efficiency is high, the noise is low, and the cost is low.

An electric machine with an internal differential planetary gear gearbox, comprising: set up motor stator subassembly and motor rotor subassembly in the motor casing, motor rotor subassembly includes: the motor comprises a motor shaft, a sun gear, a rotatable planet carrier and an inner gear ring, wherein the planet gear comprises a first planet gear and a second planet gear, the first planet gear and the second planet gear are connected into a whole, and the inner gear ring comprises a first inner gear ring and a second inner gear ring; the sun wheel is installed on a motor shaft, the motor shaft drives the sun wheel to rotate, the sun wheel is meshed with a first planet wheel installed on a planet carrier to drive the first planet wheel to rotate, the first planet wheel is meshed with a first inner gear ring, the planet carrier is driven to rotate due to the fact that the first inner gear ring is fixed, meanwhile, the first planet wheel and a second planet wheel are fixed together, the second planet wheel is meshed with a second inner gear ring, under the rotation of the first planet wheel and the planet carrier, the second inner gear ring rotates, and an output shaft of a speed reducing motor arranged on a boss of the second inner gear ring rotates.

In some embodiments, the first ring gear is opposite to the second ring gear, and the first planet gears and the second planet gears are arranged in the first ring gear and the second ring gear.

In some embodiments, the first and second planet gears each comprise 3 gears or 4 gears.

In some embodiments, the first planet gear and the second planet gear are coupled together by injection molding, riveting, or welding.

In some embodiments, a counterbore is arranged inside the second inner gear ring, and the counterbore plays the role of a bearing or serves as a bearing chamber of a motor shaft.

In some embodiments, a bearing, a circlip and a gasket sleeved on the output shaft of the speed reducing motor are further arranged on the boss of the second inner gear ring.

According to the embodiment, the gear difference planetary gear gearbox comprises the sun gear, the planetary gears, the inner gear ring, the planetary carrier and the like, the motor shaft drives the sun gear to rotate, the sun gear drives the planetary gears to rotate, the planetary gears are meshed with the inner gear ring, and the effect of the gearbox is achieved through transmission of the two-stage gears. Compared with the existing harmonic gear box, the harmonic gear box has the advantages of lower cost, simpler structure and more stable transmission; the gear transmission mechanism has the advantages of few stages, large reduction ratio, stable transmission, small volume and low noise.

Drawings

FIG. 1 is a side view of an electric machine with a built-in differential planetary gearbox according to an embodiment;

FIG. 2 is a cross-sectional view of FIG. 1;

fig. 3 is an exploded view of an electric machine with a built-in differential planetary gear gearbox according to an embodiment.

Reference numerals:

1. motor shaft, 2, motor casing, 3, motor stator subassembly, 4, sun gear, 5, first ring gear (fixed), 6, bearing, 7, circlip, 8, packing ring, 9, second ring gear (rotatable), 10, second planet wheel, 11, first planet wheel, 12, planet carrier, 13, motor lid, 14, gear motor output shaft.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Referring to fig. 1-3, the present application provides an electric machine with a built-in differential planetary gear gearbox, comprising: set up motor stator subassembly 3 and the motor rotor subassembly in the motor casing, motor stator subassembly 3 front end is provided with motor lid 13, and the motor rotor subassembly includes: the planetary gear set comprises a motor shaft 1, a sun gear 4, a first planet gear 11, a second planet gear 10, a fixed first inner gear ring 5, a rotatable second inner gear ring 9 and a rotatable planet carrier 12. The first planet wheel 11 and the second planet wheel 10 are connected into a whole, the first inner gear ring 5 and the second inner gear ring 9 are opposite in position, and the first planet wheel 11 and the second planet wheel 10 are arranged in the first inner gear ring 5 and the second inner gear ring 9.

The sun gear 4 is installed on the motor shaft 1, the motor shaft 1 drives the sun gear 4 to rotate, the sun gear 4 is meshed with the first planet gear 11 installed on the planet carrier 12 to drive the first planet gear 11 to rotate, and the first planet gear 11 is meshed with the first inner gear ring 5. The first inner gear ring 5 is fixed to drive the planet carrier 12 to rotate, and meanwhile, the first planet wheel 11 and the second planet wheel 10 are fixed together, the second planet wheel 10 is meshed with the second inner gear ring 9, the second inner gear ring 9 is driven to rotate under the rotation of the first planet wheel 11 and the planet carrier 12, and therefore the output shaft 14 of the speed reduction motor arranged on the boss of the second inner gear ring 8 rotates.

It should be pointed out that two planet wheels (first planet wheel 11 and second planet wheel 10) of this application share a set of planet carrier 12, and sun gear 4 and planet wheel adopt the mode of differential tooth transmission to reduce speed and transmit torsion, and shell 2 is as the support shell of reducing gear box and motor simultaneously, reduce cost, simplified structure.

In some embodiments, the first planet 11 and the second planet 10 each comprise 3 gears or 4 gears. The first planet wheel 11 and the second planet wheel 10 are connected together by injection moulding, riveting or welding.

In some embodiments, second ring gear 9 is provided with a counterbore on the inside, which acts as a bearing or as a bearing chamber for motor shaft 1.

In some embodiments, a bearing 6, a circlip 8 and a gasket 7 which are sleeved on the output shaft 14 of the speed reducing motor are further arranged on the boss of the second inner gear ring 9.

It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.

Claims

1. An electric machine with a built-in differential planet gear gearbox, comprising: set up motor stator subassembly and motor rotor subassembly in the motor casing, motor rotor subassembly includes: the motor comprises a motor shaft, a sun gear, a rotatable planet carrier and an inner gear ring, wherein the planet gear comprises a first planet gear and a second planet gear, the first planet gear and the second planet gear are connected into a whole, and the inner gear ring comprises a first inner gear ring and a second inner gear ring; the sun wheel is installed on a motor shaft, the motor shaft drives the sun wheel to rotate, the sun wheel is meshed with a first planet wheel installed on a planet carrier to drive the first planet wheel to rotate, the first planet wheel is meshed with a first inner gear ring, the planet carrier is driven to rotate due to the fact that the first inner gear ring is fixed, meanwhile, the first planet wheel and a second planet wheel are fixed together, the second planet wheel is meshed with a second inner gear ring, under the rotation of the first planet wheel and the planet carrier, the second inner gear ring rotates, and an output shaft of a speed reducing motor arranged on a boss of the second inner gear ring rotates.

2. The electric machine of claim 1, wherein the first ring gear is located opposite the second ring gear, and the first planet gears and the second planet gears are disposed within the first ring gear and the second ring gear.

3. The electric machine of claim 2, wherein the first and second planets each comprise 3 gears or 4 gears.

4. The electric machine of claim 2, wherein the first planet gear and the second planet gear are coupled together by injection molding, riveting, or welding.

5. The motor according to any one of claims 1 to 4, wherein a counterbore is provided inside the second ring gear, the counterbore functioning as a bearing or as a bearing chamber of a motor shaft.

6. The motor according to any one of claims 1 to 4, wherein a bearing, a circlip and a gasket sleeved on the output shaft of the speed reducing motor are further arranged on the boss of the second inner gear ring.