CN112728020A

CN112728020A - Motor with novel tooth difference planet wheel gear box

Info

Publication number: CN112728020A
Application number: CN202110056386.8A
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 Electric Co ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-04-30

Abstract

A motor with a novel gear-difference planetary gear box, the motor rotor assembly includes: a motor shaft, a sun gear, intermeshing long and short planetary gears, a rotatable planet carrier and a first ring gear, a second Ring gear; the sun gear is installed on the motor shaft, the motor shaft drives the sun gear to rotate, the sun gear meshes with the long planetary gear and the short planetary gear respectively, and drives the rotation of the long planetary gear and the short planetary gear. The ring gear is meshed. Since the first inner gear is fixed, it drives the rotation of the planet carrier. Since the long planetary gear and the short planetary gear are respectively meshed with the first inner ring gear, the long planetary gear and the second inner gear are meshed. Under the rotation of the second inner gear, the output shaft of the deceleration motor arranged on the boss of the second inner gear rotates. Compared with the traditional deceleration mechanism, the device has fewer stages, larger deceleration ratio, stable transmission, small volume, low noise and simple assembly.

Description

Motor with novel tooth difference planet wheel gear box

Technical Field

The invention relates to the technical field of motors, in particular to a motor with a novel gear difference planetary gear box.

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.

Disclosure of Invention

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 a novel differential gear 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;

the planet gears comprise a long planet gear and a short planet gear, the long planet gear and the short planet gear are both arranged on a planet carrier, the short planet gear is only meshed with a first inner gear ring, the long planet gear is meshed with the first inner gear ring and a second inner gear ring, and the inner gear rings comprise a first inner gear ring and a second inner gear ring;

the number of teeth of the first inner gear ring and the second inner gear ring is different by one or two teeth;

the sun wheel is installed on a motor shaft, the motor shaft drives the sun wheel to rotate, the sun wheel is respectively meshed with the long planet wheel and the short planet wheel to drive the long planet wheel and the short planet wheel to rotate, the long planet wheel is meshed with the first inner gear ring, the first inner gear ring is fixed to drive the planet carrier to rotate, the long planet wheel and the short planet wheel are respectively meshed with the first inner gear ring and the long planet wheel is meshed with the second inner gear ring, and under the rotation of the long planet wheel, the second inner gear ring rotates, and the output shaft of the speed reducing motor arranged on the boss of the second inner gear ring rotates.

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

In some embodiments, the long planet is 1 gear and the short planet comprises 2 gears or 3 gears.

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 embodiment of an electric machine with a differential planetary gearbox;

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

fig. 3 is an exploded view of an embodiment of an electric machine with a differential planetary gear gearbox.

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, long planet wheel, 11, short 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 following detailed description and 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, an electric machine with a novel differential planetary gear box includes: set up motor stator subassembly 3 and the motor rotor subassembly in the motor casing, this motor rotor subassembly includes: the motor comprises a motor shaft 1, a sun gear 4, a rotatable planet gear, a rotatable planet carrier 12 and an inner gear ring;

the planet gears comprise a short planet gear 11 and a long planet gear 10, the long planet gear 10 and the short planet gear 11 are respectively meshed with an inner gear ring and a sun gear, the long planet gear 10 and the short planet gear 11 are both arranged on a planet carrier 12, and the inner gear ring comprises a first inner gear ring 5 and a second inner gear ring 9;

the sun gear 4 is mounted on a motor shaft 1, the motor shaft 1 drives the sun gear 4 to rotate, the sun gear 4 is respectively meshed with the long planet gears 10 and the short planet gears 11, and the sun gear 4 rotates to drive the long planet gears 10 and the short planet gears 11 to rotate; the long planet wheel 10 is meshed with the first inner gear ring 5, and the rotation of the long planet wheel 10 and the short planet wheel 11 drives the planet carrier 12 to rotate because the first inner gear ring 5 is fixed; because the long planet wheel 10 and the short planet wheel 11 are respectively meshed with the first inner gear ring 5, and the long planet wheel 10 is meshed with the second inner gear ring 9, the second inner gear ring 9 rotates under the rotation of the long planet wheel 10, and the output shaft 14 of the speed reducing motor arranged on the boss of the second inner gear ring 9 rotates.

It should be pointed out that two planet wheels (long planet wheel 10 and short planet wheel 11) of this application share one 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, 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.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. A motor with a novel gear-difference planetary gear box, characterized in that it comprises: a motor stator assembly and a motor rotor assembly arranged in the motor housing, and the motor rotor assembly includes: a motor shaft, a sun gear, a Rotating planetary gear, rotatable planet carrier and ring gear;

The planetary gear includes a long planetary gear and a short planetary gear, the long planetary gear and the short planetary gear are both mounted on the planet carrier, the short planetary gear only meshes with the first ring gear, and the long planetary gear is connected with the first ring gear. The inner gear is meshed with the second inner gear, and the inner gear includes the first inner gear and the second inner gear;

The number of teeth of the first ring gear and the second ring gear differ by one or two teeth;

The sun gear is installed on the motor shaft, the motor shaft drives the sun gear to rotate, the sun gear meshes with the long planetary gear and the short planetary gear respectively, and drives the rotation of the long planetary gear and the short planetary gear. It meshes with the first inner gear, and because the first inner gear is fixed, it drives the rotation of the planet carrier. Since the long planetary gear and the short planetary gear mesh with the first inner gear respectively, the long planetary gear meshes with the second inner gear, Under the rotation of the long planetary gear, the second ring gear rotates, and the output shaft of the reduction motor provided on the boss of the second ring gear rotates.

2 . The motor of claim 1 , wherein the first ring gear and the second ring gear are positioned opposite to each other, and the long planetary gear and the short planetary gear are arranged in the first ring gear and the second ring gear. 3 . .

3 . The motor according to claim 2 , wherein the long planetary gear is one gear, and the short planetary gear comprises two gears or three gears. 4 .

4. The motor according to any one of claims 1 to 3, wherein a counterbore is provided on the inner side of the second ring gear, and the counterbore functions as a bearing or as a bearing chamber of the motor shaft.

5. The motor according to any one of claims 1 to 3, wherein the boss of the second ring gear is further provided with a bearing, an elastic retaining ring and a washer sleeved on the output shaft of the deceleration motor.