CN219678259U - Outer rotor gear motor for garden tool - Google Patents

Abstract

The utility model discloses an outer rotor gear motor for a gardening tool, which comprises a stator assembly and a rotor assembly, wherein the rotor assembly is arranged on the outer side of the stator assembly in a surrounding manner and penetrates through the stator assembly; the reduction gearbox assembly is arranged in front of the stator assembly and is in transmission connection with the rotor assembly, the reduction gearbox assembly comprises a reduction shell body which is a hollow cavity, and the reduction shell body is fixedly arranged in front of the stator assembly; a planetary gear transmission mechanism disposed in the reduction housing and connected to the rotor assembly; the speed reducing shaft is in transmission connection with the planetary gear transmission mechanism and penetrates through the speed reducing shell; and at least one speed reducing shaft bearing arranged at the front end in the speed reducing shell. According to the utility model, the star gear transmission mechanism is arranged, so that the output torque is effectively increased, and the stability of the motor is improved.

Description

Outer rotor gear motor for garden tool

Technical Field

The utility model relates to the technical field of motors, in particular to an outer rotor gear motor for a gardening tool.

Background

As the demand for products powered by dc batteries increases in the market place, so does the demand for dc permanent magnet brushless motors. Lithium-ion direct-current garden tools are increasingly popular with consumers as a convenient electric tool; as a power core of the gardening tool, the most used direct current permanent magnet brushless motor is generally adopted in the market at present in a direct drive mode. When a direct-current permanent magnet brushless motor in a direct-drive mode needs to output a large moment, the motor heats seriously due to the fact that the current of the motor needs to be increased, so that the insulation service life of the motor and the service life of components are influenced, the magnetic performance of magnetic steel is influenced due to the fact that the overlarge current also influences the performance of the motor, and finally the service life of the motor is reduced; meanwhile, the load of the garden tool is constantly changed, a large moment is required to be output at a low speed under some working conditions, and the fluctuation of stator current causes torque fluctuation, so that the motor cannot stably run, the performance of the motor is influenced, and meanwhile, the motor generates vibration and noise, and the mechanical life of the motor is influenced; the outer rotor speed reducing motor for the gardening tool is used for solving the problem of how to output larger moment by a direct current brushless motor.

Disclosure of Invention

The utility model aims to provide an outer rotor gear motor for a gardening tool, so as to solve the problem of how to output larger moment by a direct current brushless motor.

The external rotor speed reducing motor for the garden tool can be realized by the following technical scheme:

the utility model relates to an outer rotor gear motor for a gardening tool, which comprises a stator assembly and a rotor assembly, wherein the rotor assembly is arranged on the outer side of the stator assembly in a surrounding manner and penetrates through the stator assembly; the reduction gearbox assembly is arranged in front of the stator assembly and is in transmission connection with the rotor assembly, the reduction gearbox assembly comprises a reduction shell body which is a hollow cavity, and the reduction shell body is fixedly arranged in front of the stator assembly; a planetary gear transmission mechanism disposed in the reduction housing and connected to the rotor assembly; the speed reducing shaft is in transmission connection with the planetary gear transmission mechanism and penetrates through the speed reducing shell; and at least one speed reducing shaft bearing arranged at the front end in the speed reducing shell.

In one embodiment, the planetary gear transmission mechanism comprises a motor gear, a primary planetary gear, an external gear, a secondary planetary gear and a secondary planet carrier; the motor gear is in transmission connection with a motor shaft of the rotor assembly; the primary planetary gear is respectively connected with the motor gear and the external gear in a meshed manner; the secondary planetary gear is in meshed connection with the external gear; the second-level planet carrier is in meshed connection with the second-level planet gear, and the speed reducing shaft is in meshed connection with the second-level planet carrier.

In one embodiment, a retainer ring is arranged at the front end of the speed reducing shaft.

In one embodiment, the stator assembly includes a bracket, a hall plate, a stator core, and a stator winding mechanism; the bracket is a supporting main body; the Hall plate and the stator iron core are sequentially and fixedly arranged on the bracket; the stator winding mechanism is fixedly arranged in the stator core.

In one embodiment, a through hole is formed in the center of the bracket in a penetrating manner, and the motor shaft penetrates through the bracket through the through hole.

In one embodiment, the stator winding mechanism comprises an insulating frame and a plurality of coils, wherein the insulating frame is fixedly arranged on the stator core; the plurality of coils are uniformly distributed on the insulating frame.

In one embodiment, the rotor assembly comprises a motor shaft, a magnetic steel assembly, a rotor housing, a rotor bracket and a fan; the motor shaft penetrates through the bracket, the Hall plate and the stator core in sequence through the through hole; the magnetic steel component and the rotor shell respectively encircle the stator iron core and the stator winding mechanism, and the magnetic steel component is fixedly arranged on the inner wall of the rotor shell; the rotor bracket is fixedly connected with the rotor shell; the rear end of the motor shaft is respectively and sequentially fixedly connected with the rotor bracket and the fan.

In one embodiment, two motor bearings are fixedly arranged in the bracket, and the motor shaft is movably arranged between the two motor bearings respectively.

In one embodiment, the magnetic steel assembly comprises a magnetic steel fixing frame and a plurality of magnetic steels; the magnetic steels are uniformly and equidistantly arranged between the fixing frame and the rotor shell according to the matching sequence of the N pole and the S pole.

In one embodiment, a fan housing is provided at the rear end of the reduction gearbox assembly, the fan housing enclosing the stator assembly and the rotor assembly.

Compared with the prior art, the outer rotor gear motor for the gardening tool has the beneficial effects that:

the outer rotor gear motor for the garden tool has the advantage of outputting large torque after being decelerated by the planetary gear transmission mechanism, avoids the influence of torque alternation on the mechanical life of mechanical parts such as a bearing, a motor shaft and the like during direct driving, and also avoids the influence of current mutation on the life of an insulating material; the abrupt change of current is avoided, so that the service time of the battery is prolonged, and the service life of the battery is prolonged;

the outer rotor motor structure for the outer rotor gear motor for the gardening tool has the characteristics of small volume and high power; meanwhile, the rotor component is integrated with the fan, which is favorable for the heat dissipation of the motor, so that the motor has the characteristics of compact structure and lower cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of an external rotor gear motor for a gardening tool according to the present utility model;

FIG. 2 is a schematic cross-sectional view of an outer rotor gear motor for a garden tool, shown in FIG. 1;

FIG. 3 is a schematic diagram of an explosion structure of the outer rotor gear motor for a gardening tool according to the present utility model shown in FIG. 1, including a stator assembly, a rotor assembly and a reduction gearbox assembly;

FIG. 4 is a schematic view of an exploded structure of a stator assembly in the outer rotor gear motor for a gardening tool according to the present utility model shown in FIG. 3;

FIG. 5 is a schematic view of an exploded construction of a rotor assembly in the outer rotor gear motor for a garden tool of the present utility model shown in FIG. 3;

fig. 6 is an exploded view of a reduction gearbox assembly in an outer rotor gear motor for a garden tool according to the present utility model shown in fig. 3.

The figures indicate: 10, a stator assembly; 11, a bracket; 111, through holes; 12, hall plate; 13, stator core; 14, stator winding mechanism; 141, an insulating frame; 142, a coil; 20, a rotor assembly; 21, a motor shaft; 211, motor bearings; 22, a magnetic steel assembly; 221, a magnetic steel fixing frame; 222, magnetic steel; 23, a rotor housing; 24, a rotor support; 25, a fan; 30, a reduction gearbox assembly; 31, a speed reduction housing; 32, a planetary gear transmission mechanism; 321, motor gears; 322, primary planet gears; 323, an external gear; 324, a secondary planetary gear; 325, a secondary planet carrier; 33, a deceleration shaft; 331, a retainer ring; 34, a speed reducing shaft bearing; 40, a fan housing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 3, an outer rotor gear motor for a gardening tool of the present utility model mainly includes a stator assembly 10, a rotor assembly 20, a reduction gearbox assembly 30 and a fan housing 40; the rotor assembly 20 is arranged around the outer side of the stator assembly 10 and penetrates through the stator assembly 10, and can rotate relative to the stator assembly 10; the reduction gearbox assembly 30 is arranged above the stator assembly 10 and is in transmission connection with the rotor assembly 20; the wind housing 40 is provided at the rear end of the reduction gearbox assembly 30, which encloses the stator assembly 10 and the rotor assembly 20.

Referring to fig. 2-4, in the present embodiment, the stator assembly 10 includes a bracket 11, a hall plate 12, a stator core 13, and a stator winding mechanism 14; the bracket 11 is a supporting main body; the Hall plate 12 and the stator iron core 13 are sequentially and fixedly arranged on the bracket 11; the stator winding mechanism 14 is fixedly provided in the stator core 13. In this embodiment, a through hole 111 is formed through the center of the bracket 11, and the motor shaft 21 of the rotor assembly 20 penetrates the bracket 11 through the through hole 111; the stator winding mechanism 14 comprises an insulating frame 141 and a plurality of coils 142, wherein the insulating frame 141 is fixedly arranged on the stator core 13 and is formed by combining two subframes; the plurality of coils 142 are uniformly distributed on the insulating frame 141.

Referring to fig. 2, 3 and 5, in the present embodiment, the rotor assembly 20 includes a motor shaft 21, a magnetic steel assembly 22, a rotor housing 23, a rotor bracket 24 and a fan 25; the motor shaft 21 penetrates through the bracket 11, the Hall plate 12 and the stator core 13 in sequence through the through hole 111; the magnetic steel component 22 and the rotor shell 23 respectively encircle the stator core 13 and the stator winding mechanism 14, and the magnetic steel component 22 is fixedly arranged on the inner wall of the rotor shell 23; the rotor bracket 24 is fixedly connected with the rotor shell 23; the rear end of the motor shaft 21 is fixedly connected with the rotor bracket 24 and the fan 25 in sequence. In this embodiment, two motor bearings 211 are fixedly disposed in the bracket 11, and the motor shaft 21 is movably disposed between the two motor bearings 211, respectively, and is capable of rotating on the two motor bearings 211; the magnetic steel assembly 22 comprises a magnetic steel fixing frame 221 and a plurality of magnetic steels 222, and the magnetic steels 222 are uniformly and equidistantly arranged between the fixing frame 221 and the rotor shell 23 according to the matching sequence of N poles and S poles.

Referring to fig. 1, 2, 3 and 6, the reduction gearbox assembly 30 includes a reduction housing 31, a planetary gear mechanism 32, a reduction shaft 33 and at least one reduction shaft bearing 34; the speed reduction housing 31 is a hollow cavity, and is fixedly arranged in front of the bracket 11, specifically, the speed reduction housing 31 is fixedly arranged at the front end of the bracket 11 through a plurality of screw structures; the planetary gear transmission mechanism 32 is arranged in the reduction housing 31 and connected with the motor shaft 21, and realizes reduction transmission and simultaneously outputs increased moment through the action of the planetary gear transmission mechanism 32; the speed reducing shaft 33 is in transmission connection with the planetary gear transmission mechanism 32 and penetrates through the speed reducing shell 31; at least one of the speed reducing shaft bearings 34 is provided at a front end within the speed reducing housing 31, and the speed reducing shaft 33 is movably provided on at least one of the speed reducing shaft bearings 34, which is rotatable in at least one of the speed reducing shaft bearings 34; in the present embodiment, two of the reduction shaft bearings 34 are provided at the front end of the reduction housing 31.

Referring to fig. 6, in the present embodiment, the planetary gear transmission mechanism 32 includes a motor gear 321, a primary planetary gear 322, an external gear 323, a secondary planetary gear 324, and a secondary planetary carrier 325; the motor gear 321 is in transmission connection with the motor shaft 21, and rotates along with the rotation of the motor shaft 21; the primary planetary gear 322 is respectively meshed with the motor gear 321 and the external gear 323; the secondary planet gears 324 are engaged with the external gear 323; the secondary planet carrier 325 is in meshed connection with the secondary planet gear 324, and the speed reducing shaft 33 is in meshed connection with the secondary planet carrier 325; when the motor shaft 21 rotates, the reduction shaft 33 is driven to rotate through the transmission of the motor gear 321, the primary planetary gear 322, the external gear 323, the secondary planetary gear 324 and the secondary planetary carrier 325 in sequence, and meanwhile, the torque with larger output is effectively increased. In this embodiment, a retainer ring 331 is disposed at the front end of the speed reduction shaft 33, and the retainer ring 331 is disposed in front of the speed reduction housing 31, so as to prevent foreign matters from entering the speed reduction housing 31 through the connection portion between the speed reduction shaft 33 and the speed reduction housing 31.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The outer rotor speed reducing motor for the gardening tool is characterized by comprising a stator assembly and a rotor assembly, wherein the rotor assembly is arranged on the outer side of the stator assembly in a surrounding mode and penetrates through the stator assembly; the reduction gearbox assembly is arranged in front of the stator assembly and is in transmission connection with the rotor assembly, the reduction gearbox assembly comprises a reduction shell body which is a hollow cavity, and the reduction shell body is fixedly arranged in front of the stator assembly; a planetary gear transmission mechanism disposed in the reduction housing and connected to the rotor assembly; the speed reducing shaft is in transmission connection with the planetary gear transmission mechanism and penetrates through the speed reducing shell; and at least one speed reducing shaft bearing arranged at the front end in the speed reducing shell.

2. The external rotor speed reducing motor for a garden tool, as recited in claim 1, wherein said planetary gear transmission mechanism comprises a motor gear, a primary planetary gear, an external gear, a secondary planetary gear, and a secondary planetary carrier; the motor gear is in transmission connection with a motor shaft of the rotor assembly; the primary planetary gear is respectively connected with the motor gear and the external gear in a meshed manner; the secondary planetary gear is in meshed connection with the external gear; the second-level planet carrier is in meshed connection with the second-level planet gear, and the speed reducing shaft is in meshed connection with the second-level planet carrier.

3. The external rotor gear motor for a garden tool as claimed in claim 2, wherein a retainer ring is provided at the front end of the speed reducing shaft.

4. The external rotor gear motor for a garden tool, as recited in claim 2, wherein the stator assembly comprises a bracket, a hall plate, a stator core, and a stator winding mechanism; the bracket is a supporting main body; the Hall plate and the stator iron core are sequentially and fixedly arranged on the bracket; the stator winding mechanism is fixedly arranged in the stator core.

5. The external rotor speed reducing motor for a garden tool, as set forth in claim 4, wherein a through hole is provided through a center position of the bracket, and the motor shaft penetrates through the bracket through the through hole.

6. The external rotor speed reducing motor for a garden tool, as set forth in claim 4, wherein said stator winding mechanism comprises an insulating frame and a plurality of coils, said insulating frame being fixedly provided on said stator core; the plurality of coils are uniformly distributed on the insulating frame.

7. The external rotor gear motor for a garden tool, as recited in claim 5, wherein the rotor assembly comprises a motor shaft, a magnetic steel assembly, a rotor housing, a rotor bracket, and a fan; the motor shaft penetrates through the bracket, the Hall plate and the stator core in sequence through the through hole; the magnetic steel component and the rotor shell respectively encircle the stator iron core and the stator winding mechanism, and the magnetic steel component is fixedly arranged on the inner wall of the rotor shell; the rotor bracket is fixedly connected with the rotor shell; the rear end of the motor shaft is respectively and sequentially fixedly connected with the rotor bracket and the fan.

8. The external rotor speed reducing motor for garden tool as set forth in claim 7, wherein two motor bearings are fixedly provided in the bracket, and the motor shaft is movably provided between the two motor bearings, respectively.

9. The external rotor gear motor for a garden tool, as recited in claim 7, wherein the magnetic steel assembly comprises a magnetic steel fixing frame and a plurality of magnetic steels; the magnetic steels are uniformly and equidistantly arranged between the fixing frame and the rotor shell according to the matching sequence of the N pole and the S pole.

10. An outer rotor gear motor for a garden tool, as claimed in any one of claims 1-9, wherein the rear end of the reduction box assembly is provided with a fan housing, which encloses the stator assembly and the rotor assembly.