A low-noise geared motor

Abstract

A low-noise geared motor includes a motor and a gearbox. The motor has a motor shaft. The gearbox includes a gearbox housing mounted on the motor, motor teeth mounted on the motor shaft, a first planetary assembly, a second planetary assembly, a bearing housed within the gearbox housing, and an output shaft. An internal gear ring is provided on the inner sidewall of the gearbox housing. The first planetary assembly includes a first planetary disk, multiple first connecting shafts, multiple first planetary teeth located at the bottom of the first planetary disk and meshing with the internal gear ring, and a sun tooth located at the center of the top surface of the first planetary disk. The second planetary assembly includes a second planetary disk, multiple second connecting shafts, and multiple second planetary teeth located at the bottom of the second planetary disk and meshing with the internal gear ring. The output shaft is mounted on the bearing, and its end is fixed to the center of the top surface of the second planetary disk. All gears are helical, and the axial force generated by the helical teeth is directed towards one side of the motor. Compared with the prior art, the geared motor of this invention has low operating noise.

Description

Technical Field

[0001] This utility model belongs to the field of geared motor technology, specifically relating to a low-noise geared motor. Background Technology

[0002] As a core component of most household appliances, the noise control of the gear transmission structure of geared motors directly affects the user experience and reliability of these appliances. In existing geared motors, the gearbox gears mostly use spur gears for power transmission. This is mainly because spur gears are simple to manufacture, have low production costs, and generate no axial force. For example, the planetary gear reducer and gearbox of the geared motor disclosed in authorization announcement number CN221120796 U are typical designs of this type. However, because the meshing method of spur gears is single-tooth alternating meshing, the contact form is line contact, resulting in a large impact force at the moment of meshing and high operating noise. This leads to significant noise during appliance use, affecting the user experience. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a low-noise geared motor.

[0004] To achieve the above objectives, this utility model discloses a low-noise geared motor, including a motor and a gearbox, wherein the first end of the motor is provided with a motor shaft;

[0005] The gearbox includes a gearbox housing, motor teeth, a first planetary assembly, a second planetary assembly, bearings, and an output shaft;

[0006] The gearbox housing is installed at the first end of the motor, and the inner sidewall of the gearbox housing is provided with an inner gear ring.

[0007] The motor teeth are mounted on the motor shaft;

[0008] The first planetary assembly includes a first planetary disk, a plurality of first connecting shafts, a plurality of first planetary teeth, and a sun tooth; the plurality of first connecting shafts are circumferentially spaced at the bottom of the first planetary disk; each first planetary tooth is rotatably connected to a first connecting shaft and meshes with an internal gear ring;

[0009] The second planetary assembly includes a second planetary disk, a plurality of second connecting shafts, and a plurality of second planetary teeth; the plurality of second connecting shafts are circumferentially spaced at the bottom of the second planetary disk, and each second planetary tooth is rotatably connected to a second connecting shaft and meshes with an internal gear ring;

[0010] The sun tooth is mounted at the center of the top surface of the first planetary disk for meshing with all the second planetary teeth;

[0011] The bearing is installed inside the gearbox housing, and the output shaft is installed on the bearing with its end fixed to the center of the top surface of the second planetary disk.

[0012] The motor teeth, the first planetary teeth, the sun teeth, and the second planetary teeth are all helical teeth.

[0013] The axial force of the motor teeth on the first planetary teeth and the axial force of the sun teeth on the second planetary teeth are both directed toward one side of the motor.

[0014] In one embodiment, a first annular gasket is provided at the bottom of the inner cavity of the gearbox housing, and the bottom of all the first planetary teeth contacts the first annular gasket; a second annular gasket is provided on each second planetary disk, and the bottom of all the second planetary teeth contacts the second annular gasket.

[0015] In another embodiment, each first planetary tooth has a first protrusion at its bottom, the first protrusion contacting a first annular gasket; and / or each second planetary tooth has a second protrusion at its bottom, the second protrusion contacting a second annular gasket.

[0016] In another embodiment, the width of the first protrusion and / or the second protrusion gradually decreases toward the side away from the corresponding planetary tooth.

[0017] In another embodiment, the cross-sectional shape of the first protrusion and / or the second protrusion is trapezoidal.

[0018] In another embodiment, the top surfaces of the first and second annular gaskets are smooth surfaces.

[0019] In another embodiment, the first planetary disk is detachably connected to the first connecting shaft; and / or the second planetary disk is detachably connected to the second connecting shaft.

[0020] In another embodiment, the first connecting shaft and / or the second connecting shaft are interference-fitted onto the corresponding planetary disk.

[0021] In another embodiment, the gearbox housing includes a housing and an end cap. The end cap is connected to the first end of the motor. The end cap has a threaded hole on its periphery. The housing is fitted over the end cap. The housing has a through hole on its periphery opposite to the threaded hole. A bolt passes through the through hole and connects to the threaded hole.

[0022] In another embodiment, the bearing is a deep groove ball bearing.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] The motor teeth, first planetary teeth, sun teeth, and second planetary teeth are all helical teeth. When the gears mesh, the transition from the tooth tip to the tooth root is gradual, which extends the single tooth bearing time. The simultaneous meshing of multiple teeth reduces the impact force and vibration amplitude during gear meshing and reduces gear operating noise.

[0025] The output shaft is connected to a bearing inside the gearbox, which makes the installation of the output shaft more reliable and the operation more stable.

[0026] By directing the axial force of the motor teeth on the first planetary teeth and the axial force of the sun teeth on the second planetary teeth towards the motor side, the axial force of the helical teeth can be prevented from acting on the bearings during gearbox operation, thus avoiding damage to the bearings and improving the service life of the bearings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the low-noise geared motor in the embodiment;

[0028] Figure 2 for Figure 1 A three-dimensional exploded view of the low-noise geared motor;

[0029] Figure 3 for Figure 1 A three-dimensional exploded view of the first planetary component;

[0030] Motor 100; Motor shaft 110;

[0031] Gearbox 200; housing 210; shell 211; internal gear ring 212; through hole 213; end cover 214; threaded hole 215; bolt 216; motor gear 220; first planetary assembly 230; first planetary disk 231; first connecting shaft 232; first planetary gear 233; first protrusion 2331; sun gear 234; second planetary assembly 240; second planetary disk 241; second connecting shaft 242; second planetary gear 243; second protrusion 2431; bearing 250; output shaft 260; first annular washer 270; second annular washer 280. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] A low-noise geared motor 100, see Figures 1-2The system includes a motor 100 and a gearbox 200. A motor shaft 110 extends from the top of the motor 100. The gearbox 200 includes a gearbox housing 210, motor teeth 220, a first planetary assembly 230, a second planetary assembly 240, a bearing 250, and an output shaft 260. The gearbox housing 210 is mounted on the top of the motor 100, and an internal gear ring 212 is provided on the inner sidewall of the gearbox housing 210. The motor teeth 220 are mounted on the motor shaft 110. The first planetary assembly 230 includes a first planetary disk 231, a plurality of first connecting shafts 232, a plurality of first planetary teeth 233, and a sun tooth 234. In this embodiment, there are three first connecting shafts 232 and three first planetary teeth 233. The three first connecting shafts 232 are circumferentially spaced at the bottom of the first planetary disk 231; each first planetary tooth 233 is rotatably connected to a first connecting shaft 232 and meshes with the internal gear ring 212. The second planetary assembly 240 includes a second planetary disk 241, multiple second connecting shafts 242, and multiple second planetary teeth 243. There are also three second connecting shafts 242 and three second planetary teeth 243. The three second connecting shafts 242 are circumferentially spaced at the bottom of the second planetary disk 241. Each second planetary tooth 243 is rotatably connected to one of the second connecting shafts 242 and meshes with the internal gear ring 212. The sun tooth 234 is mounted at the center of the top surface of the first planetary disk 231 for meshing with all the second planetary teeth 243. A bearing 250 is mounted inside the gearbox housing 210, and the output shaft 260 is mounted on the bearing 250 with its end fixed to the center of the top surface of the second planetary disk 241. The bearing 250 makes the installation of the output shaft 260 more reliable and its operation smoother.

[0034] During operation, the motor shaft 110 of the motor 100 drives the motor gear 220 to rotate. Under the action of the motor gear 220 and the internal gear ring 212, the three first planetary teeth 233 rotate, causing the first planetary disk 231 and the sun tooth 234 to rotate synchronously. Subsequently, under the action of the sun tooth 234 and the internal gear ring 212, the three second planetary teeth 243 rotate, causing the second planetary disk 241 to rotate, which ultimately drives the output shaft 260 to rotate.

[0035] In this embodiment, the motor tooth 220, the first planetary tooth 233, the sun tooth 234, and the second planetary tooth 243 are all helical teeth. When the gears mesh, they gradually transition from the tooth tip to the tooth root, extending the single tooth bearing time. The simultaneous meshing of multiple teeth reduces the impact force and vibration amplitude during gear meshing, and reduces the gear running noise.

[0036] The axial force of the motor tooth 220 on the first planetary tooth 233 and the axial force of the sun tooth 234 on the second planetary tooth 243 are both directed towards the motor 100. This avoids the axial force of the helical teeth acting on the bearing 250 during the operation of the gearbox 200, which would cause damage to the bearing 250 and improve the service life of the bearing 250.

[0037] Preferably, in this embodiment, the bearing 250 is a deep groove ball bearing 250. Since the deep groove ball bearing 250 cannot withstand axial force, the above-described structural design provides the best effect for the deep groove ball bearing 250.

[0038] It is understandable that the central axis of the outer casing 210, the motor gear 220, the sun gear 234, the central axis of the multiple first planetary gears 233, and the central axis of the multiple second planetary gears 243 are coaxial.

[0039] In this embodiment, a first annular gasket 270 is provided at the bottom of the inner cavity of the gearbox housing 210, and the bottom of all the first planetary teeth 233 contacts the first annular gasket 270. A second annular gasket 280 is provided on each second planetary disk 241, and the bottom of all the second planetary teeth 243 contacts the second annular gasket 280.

[0040] Since the axial force of the helical gear transmission is directed toward the motor 100, it will press against the corresponding annular gasket. Therefore, the annular gasket can be placed in the corresponding position without the need for a special installation structure.

[0041] In this embodiment, see Figure 3 Each first planetary tooth 233 has a first protrusion 2331 at its bottom, which contacts the first annular gasket 270. In this way, the first planetary tooth 233 does not need to contact the first annular gasket 270 with its entire bottom surface. The contact area is smaller, which reduces the running resistance of the first planetary tooth 233 and the annular gasket, improves the smoothness of the operation of the first planetary tooth 233, and also reduces the operating noise.

[0042] The width of the first protrusion 2331 gradually decreases towards the side away from the first planetary tooth 233, and its cross-sectional shape is trapezoidal.

[0043] Similarly, each second planetary tooth 243 has a second protrusion 2431 at its bottom, which contacts the second annular gasket 280. The width of the second protrusion 2431 gradually decreases towards the side away from the second planetary tooth 243, and its cross-sectional shape is trapezoidal.

[0044] In this embodiment, the top surfaces of the first annular gasket 270 and the second annular gasket 280 are smooth surfaces, which further improves the smoothness of the operation of the planetary gear and the gasket, and at the same time further reduces the operating noise.

[0045] In this embodiment, the first planetary disk 231 is detachably connected to the first connecting shaft 232, and the second planetary disk 241 is detachably connected to the second connecting shaft 242. This facilitates the replacement and maintenance of the planetary components and avoids the problem in the prior art where the planetary disk and the corresponding connecting shaft are injection molded, and the connection position between the planetary disk and the connecting shaft is prone to quality defects after injection molding.

[0046] Specifically, the first connecting shaft 232 and the second connecting shaft 242 are interference-fitted onto the corresponding planetary disks.

[0047] In this embodiment, the gearbox housing 210 includes a housing 211 and an end cover 214. The end cover 214 is connected to the first end of the motor 100. The end cover 214 has a threaded hole 215 on its periphery. The housing 211 is fitted over the end cover 214. The housing 211 has a through hole 213 on its periphery opposite to the threaded hole 215. A bolt 216 passes through the through hole 213 and is connected to the threaded hole 215.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A low-noise geared motor, characterized in that: Includes a motor and a gearbox, wherein the first end of the motor is provided with a motor shaft; The gearbox includes a gearbox housing, motor teeth, a first planetary assembly, a second planetary assembly, bearings, and an output shaft; The gearbox housing is installed at the first end of the motor, and the inner sidewall of the gearbox housing is provided with an inner gear ring. The motor teeth are mounted on the motor shaft; The first planetary assembly includes a first planetary disk, a plurality of first connecting shafts, a plurality of first planetary teeth, and a sun tooth; the plurality of first connecting shafts are circumferentially spaced at the bottom of the first planetary disk; each first planetary tooth is rotatably connected to a first connecting shaft and meshes with an internal gear ring; The second planetary assembly includes a second planetary disk, a plurality of second connecting shafts, and a plurality of second planetary teeth; the plurality of second connecting shafts are circumferentially spaced at the bottom of the second planetary disk, and each second planetary tooth is rotatably connected to a second connecting shaft and meshes with an internal gear ring; The sun tooth is mounted at the center of the top surface of the first planetary disk for meshing with all the second planetary teeth; The bearing is installed inside the gearbox housing, and the output shaft is installed on the bearing with its end fixed to the center of the top surface of the second planetary disk. The motor teeth, the first planetary teeth, the sun teeth, and the second planetary teeth are all helical teeth. The axial force of the motor teeth on the first planetary teeth and the axial force of the sun teeth on the second planetary teeth are both directed toward one side of the motor.

2. The low-noise geared motor according to claim 1, characterized in that: The bottom of the inner cavity of the gearbox housing is provided with a first annular gasket, and the bottom of all the first planetary teeth is in contact with the first annular gasket; each second planetary disk is provided with a second annular gasket, and the bottom of all the second planetary teeth is in contact with the second annular gasket.

3. The low-noise geared motor according to claim 2, characterized in that: Each first planetary tooth has a first protrusion at its bottom, which contacts a first annular gasket; and / or each second planetary tooth has a second protrusion at its bottom, which contacts a second annular gasket.

4. The low-noise geared motor according to claim 3, characterized in that: The width of the first protrusion and / or the second protrusion gradually decreases toward the side away from the corresponding planetary tooth.

5. The low-noise geared motor according to claim 4, characterized in that: The cross-sectional shape of the first protrusion and / or the second protrusion is trapezoidal.

6. The low-noise geared motor according to claim 2, characterized in that: The top surfaces of the first and second annular gaskets are smooth surfaces.

7. The low-noise geared motor according to claim 1, characterized in that: The first planetary disk is detachably connected to the first connecting shaft; and / or the second planetary disk is detachably connected to the second connecting shaft.

8. The low-noise geared motor according to claim 7, characterized in that: The first connecting shaft and / or the second connecting shaft are interference-fitted into the corresponding planetary disk.

9. The low-noise geared motor according to claim 1, characterized in that: The gearbox housing includes a housing and an end cap. The end cap is connected to the first end of the motor. The end cap has a threaded hole on its periphery. The housing is fitted over the end cap. The housing has a through hole on its periphery opposite to the threaded hole. Bolts pass through the through hole and connect to the threaded hole.

10. The low-noise geared motor according to claim 1, characterized in that: The bearing is a deep groove ball bearing.

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