Drive system of washing machine and drum washing machine having the same

Abstract

The present invention discloses a drive system for a washing machine and a drum washing machine having the same. The drive system includes: a pulsator shaft, the first end of the pulsator shaft being adapted to be connected to a pulsator; a drum shaft sleeve, the pulsator shaft being rotatable relative to the drum shaft sleeve, the first end of the drum shaft sleeve being adapted to be connected to a drum; a bracket assembly, the drum shaft sleeve being provided on the bracket assembly and rotatable relative to the bracket assembly, the bracket assembly being adapted to be connected to an outer tub; a motor, the motor being an inner rotor motor and being adapted to be connected to the outer tub; a belt drive mechanism, the belt drive mechanism including a pulley and a belt, one end of the belt being sleeved on the outer peripheral side of the output shaft of the motor, the other end of the belt being sleeved on the outer peripheral side of the pulley, the pulley being connected to the second end of the drum shaft sleeve; a gear drive mechanism; and a clutch mechanism. According to the drive system of the washing machine of the present invention, on the basis of realizing the dual-output function, it has low cost, low energy consumption, good stiffness and strength, is easy to assemble, and occupies little axial space of the washing machine.

Description

Technical Field

[0001] The present invention relates to the technical field of washing machines, and in particular, to a drive system of a washing machine and a drum washing machine having the same. Background Art

[0002] In order to improve the cleaning ability of a washing machine, generally a pulsator is provided at the bottom of the drum of the washing machine, and during washing, the drum and the pulsator rotate relative to each other at different speeds to increase the friction between the clothes, thereby improving the washing ratio. A double-power drum washing machine is disclosed in the related art, which is driven by an outer-rotor DD motor (outer-rotor linear motor). The rotor is directly fixed to the pulsator through the pulsator shaft and rotates at the same speed. The sun gear fixed on the pulsator shaft transmits power to the drum shaft through the planet gears at an equal speed ratio, realizing the differential rotation of the pulsator and the drum in the same direction. In order to reduce the compressed axial dimension and realize the installation function, this structure requires a split design of the front and rear bearing brackets. The gearbox is arranged between the front and rear bearings, and then the front and rear bearing brackets are connected together through assembly. Moreover, in the double-power drum washing machine in the related art, the rotor is generally fixed on the pulsator shaft, and the pulsator shaft is a slender shaft, which will cause problems such as insufficient rigidity. Furthermore, this design completely changes the assembly method and connection relationship of the drive system of the traditional drum washing machine, greatly changes the overall machine design, and has problems such as more parts, difficult assembly, and low utilization rate of the axial space.

[0003] In addition, compared with the traditional BLDC inner-rotor motor, the outer-rotor DD motor requires a large starting torque, has a large difference in speed during washing and dehydration, high energy consumption, and high cost. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a drive system of a washing machine, which has a low cost, low energy consumption, good stiffness and strength, a simple structure, small design changes, easy assembly, and small occupation of the axial space of the washing machine on the basis of realizing the dual-output function.

[0005] The present invention also provides a washing machine having the drive system of the above washing machine.

[0006] The drive system of a washing machine according to an embodiment of the present invention, the washing machine includes the drive system, an outer tub, a drum, and a pulsator. The drum is rotatably disposed within the outer tub, and the pulsator is rotatably disposed at the bottom of the drum. The drive system includes: a pulsator shaft, a first end of the pulsator shaft being adapted to be connected to the pulsator; a drum shaft sleeve, the drum shaft sleeve being sleeved around the outer periphery of the pulsator shaft, the pulsator shaft being rotatable relative to the drum shaft sleeve, a first end of the drum shaft sleeve being adapted to be connected to the drum; a bracket assembly, the drum shaft sleeve being disposed on the bracket assembly and rotatable relative to the bracket assembly, the bracket assembly being adapted to be connected to the outer tub; a motor, the motor being an inner rotor motor, the motor being adapted to be connected to the outer tub; a belt drive mechanism, the belt drive mechanism including a pulley and a belt, one end of the belt being sleeved around the outer peripheral side of the output shaft of the motor, the other end of the belt being sleeved around the outer peripheral side of the pulley, the pulley being connected to a second end of the drum shaft sleeve; a gear drive mechanism, a second end of the pulsator shaft being connected to the belt drive mechanism through the gear drive mechanism; a clutch mechanism, the clutch mechanism being selectively engaged with one of the gear drive mechanism and the bracket assembly. When the clutch mechanism is engaged with the gear drive mechanism, the pulsator shaft rotates synchronously with the drum shaft sleeve; when the clutch mechanism is engaged with the bracket assembly, the pulsator shaft rotates differentially with the drum shaft sleeve.

[0007] The drive system of a washing machine according to an embodiment of the present invention, by making the motor an inner rotor motor and transmitting the power of the motor to the internal gear ring through a belt and a pulley, can reduce the cost and energy consumption of the motor on the basis of ensuring the starting torque of the washing machine, thereby facilitating the reduction of the cost and energy consumption of the drive system. And compared with the traditional method of fixing the motor on the motor shaft, by connecting the pulley to the second end of the drum shaft sleeve, it is beneficial to improve the rigidity of the drive system and at the same time beneficial to reduce the axial dimension of the drive system. In addition, when the clutch mechanism is engaged with the gear drive mechanism, the pulsator shaft rotates synchronously with the drum shaft sleeve; when the clutch mechanism is engaged with the bracket assembly, the pulsator shaft rotates differentially with the drum shaft sleeve, so that the pulsator shaft and the drum shaft sleeve can be switched between two modes of synchronous rotation and differential rotation, and further the washing machine can be adapted to different materials of clothes.

[0008] In some embodiments of the present invention, the pulley has a central hole, a first spline portion is formed on the inner peripheral wall of the central hole, the second end of the drum shaft sleeve has a pulley connection portion, the pulley connection portion is fitted in the central hole, and a second spline portion that cooperates with the first spline portion is formed on the pulley connection portion.

[0009] In some embodiments of the present invention, the bracket assembly includes a bearing bracket and a rear housing connected to each other. A bearing is provided on the bearing bracket, and the bearing is sleeved on the outer periphery of the drum bushing. The rear housing is disposed on one axial side of the bearing bracket. A receiving space is defined between the bearing bracket and the rear housing, and the belt transmission mechanism, the gear transmission mechanism, and the clutch mechanism are all located in the receiving space.

[0010] Optionally, the bearing bracket is an integrally formed part.

[0011] In some alternative embodiments of the present invention, an avoidance notch is formed on the outer peripheral wall of the rear housing, and one end of the belt passes through the avoidance notch and is sleeved on the outer peripheral side of the output shaft.

[0012] In some embodiments of the present invention, the gear transmission mechanism includes: an internal gear ring, which is connected to the belt pulley and coaxially arranged. When the clutch mechanism cooperates with the internal gear ring, the agitator shaft rotates synchronously with the drum bushing; a sun gear, which is connected to the agitator shaft and coaxially arranged with the agitator shaft, and the sun gear is located inside the internal gear ring; a planet carrier assembly, which has a plurality of planet gear shafts, and the planet carrier assembly is sleeved on the outer periphery of the agitator shaft and is rotatable relative to the agitator shaft; planet gears, which are multiple and are respectively rotatably sleeved on the plurality of planet gear shafts. The multiple planet gears are located between the internal gear ring and the sun gear and are arranged around the outer periphery of the sun gear, and the planet gears are meshed with both the internal gear ring and the sun gear.

[0013] Optionally, the multiple planet gears are in a group, and each planet gear is directly meshed with the internal gear ring and the sun gear.

[0014] In some alternative embodiments of the present invention, the multiple planet gears are two mutually meshing groups, and one of the two groups of planet gears is meshed with the internal gear ring and the other group is meshed with the sun gear.

[0015] Optionally, an avoidance groove is formed on the inner peripheral wall of the second end of the drum bushing. The avoidance groove penetrates the axial end face of the second end of the drum bushing. A part of the planet carrier assembly is received in the avoidance groove, and the planet carrier assembly is spaced apart from the drum bushing.

[0016] In some alternative embodiments of the present invention, the internal gear ring is integrally injection molded on the belt pulley.

[0017] Optionally, the clutch mechanism includes: a clutch sliding sleeve, on the inner peripheral wall of which a third spline portion is formed; the planetary carrier assembly includes a planetary carrier and a cover plate connected to each other; the internal gear ring is rotatably arranged between the outer peripheral wall of the planetary carrier and the inner peripheral wall of the cover plate; an installation space is defined between the planetary carrier and the cover plate; the sun gear and a plurality of the planetary gears are both located in the installation space; on the outer peripheral wall of the cover plate, a fourth spline portion is formed for cooperating with the third spline portion, and the clutch sliding sleeve is axially slidable relative to the cover plate between a first position and a second position; an electromagnetic coil assembly, when the electromagnetic coil assembly is energized, the electromagnetic coil assembly is adapted to drive the clutch sliding sleeve to slide axially in a first direction; a clutch spring for driving the clutch sliding sleeve to slide in a second direction opposite to the first direction. When the clutch sliding sleeve slides in the first direction to the first position, the clutch sliding sleeve cooperates with the internal gear ring; when the clutch sliding sleeve slides in the second direction to the second position, the clutch sliding sleeve cooperates with the bracket assembly.

[0018] In some alternative embodiments of the present invention, the clutch spring is arranged between the bracket assembly and the clutch sliding sleeve.

[0019] Optionally, the clutch spring is arranged between the pulley and the clutch sliding sleeve.

[0020] In some alternative embodiments of the present invention, on the first axial end face of the clutch sliding sleeve, a plurality of first clutch teeth are formed circumferentially; on the internal gear ring, second clutch teeth are formed for cooperating with the plurality of first clutch teeth; on the second axial end face of the clutch sliding sleeve, a plurality of third clutch teeth are formed circumferentially; on the bracket assembly, fourth clutch teeth are formed for cooperating with the plurality of third clutch teeth.

[0021] Optionally, in the axial direction of the clutch sliding sleeve, both the first clutch teeth and the third clutch teeth are formed in a stepped shape.

[0022] The drum washing machine according to an embodiment of the present invention includes: an outer tub; a drum rotatably arranged in the outer tub; a pulsator rotatably arranged at the bottom of the drum; the above-mentioned drive system of the washing machine, the first end of the pulsator shaft is connected to the pulsator, the first end of the drum shaft sleeve is connected to the drum, the bracket assembly is connected to the outer tub, and the motor is connected to the outer tub.

[0023] The drum washing machine according to the embodiment of the present invention, by providing the above-described drive system of the washing machine, making the motor an inner rotor motor, and transmitting the power of the motor to the internal gear ring through a belt and a pulley, can, on the basis of ensuring the starting torque of the washing machine, reduce the cost and energy consumption of the motor, thereby facilitating the reduction of the cost and energy consumption of the drive system. Moreover, compared with the traditional method of fixing the motor on the motor shaft, by connecting the pulley to the second end of the drum shaft sleeve, it is beneficial to improve the rigidity of the drive system and simultaneously reduce the axial dimension of the drive system. Additionally, when the clutch mechanism cooperates with the gear transmission mechanism, the agitator shaft rotates synchronously with the drum shaft sleeve, and when the clutch mechanism cooperates with the bracket assembly, the agitator shaft rotates differentially with the drum shaft sleeve, thereby enabling the agitator shaft and the drum shaft sleeve to switch between two modes of synchronous rotation and differential rotation, so that the washing machine can adapt to clothes of different materials. Brief Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0025] Figure 1 is a schematic structural view of the drive system according to the embodiment of the present invention;

[0026] Figure 2 is an exploded view of the drive system according to the embodiment of the present invention;

[0027] Figure 3 is a schematic sectional view of the drive system according to the embodiment of the present invention;

[0028] Figure 4 is a rear view of the drive system according to the embodiment of the present invention;

[0029] Figure 5 is a schematic structural view of the drum shaft sleeve according to the embodiment of the present invention;

[0030] Figure 6 is a schematic structural view of the agitator shaft according to the embodiment of the present invention;

[0031] Figure 7 is a schematic structural view of the clutch sliding sleeve according to the embodiment of the present invention;

[0032] Figure 8 is a schematic structural view of the planet carrier according to the embodiment of the present invention;

[0033] Figure 9 is a schematic structural view of the cover plate according to the embodiment of the present invention;

[0034] Figure 10 is a schematic structural view of the internal gear ring according to the embodiment of the present invention;

[0035] Figure 11 Schematic diagram of the assembly relationship of the gear transmission assembly according to an embodiment of the present invention.

[0036] Reference numerals:

[0037] Washing machine 100;

[0038] Drive system 10;

[0039] Washboard shaft 1; Washboard connection part 11; Small oil seal connection part 12; Bushing installation part 13; First shaft shoulder 14; Second shaft shoulder 15;

[0040] Drum shaft sleeve 2; Pulley connection part 21; Second spline part 211; Drum connection part 22; Large oil seal connection part 23;

[0041] Bearing installation part 24; Small oil seal installation part 25; First bushing installation part 26; Second bushing installation part 27; Avoidance groove 28;

[0042] Bracket assembly 3; Bearing bracket 31; First bearing chamber 311; Second bearing chamber 312; Rear shell 32; Avoidance notch 321; Fourth clutch tooth 322;

[0043] Motor 4; Output shaft 41;

[0044] Belt drive mechanism 5; Pulley 51; Central hole 511; First spline part 512; Belt 52;

[0045] Gear drive mechanism 6;

[0046] Internal gear ring 61; Second clutch tooth 611; Flange 612; Second oil retaining part 615;

[0047] Sun gear 62;

[0048] Planet carrier assembly 63; Planet carrier 631; Support column 6311; Third bushing installation part 6312; First installation hole 6313; First oil retaining part 6314; Planet gear shaft 6315; Cover plate 632; Fourth spline part 6321; Second installation hole 6322; Support column through hole 6323; Fourth bushing installation part 6324;

[0049] Planet gear 64;

[0050] Clutch mechanism 7; Clutch sliding sleeve 71; Third spline part 711; First clutch tooth 712; Third clutch tooth 713; Non-magnetic tooth-shaped part 714; Magnetic conductive sleeve 715; Spring installation part 716; Electromagnetic coil assembly 72; Clutch spring 73;

[0051] First bushing 81; Second bushing 82; Third bushing 83; Fourth bushing 84; Fifth bushing 85; First bearing 86; Second bearing 87;

[0052] Large water seal 91; first sealing lip 911; small water seal 92; third sealing lip 921; adjusting washer 93; snap ring 94;

[0053] Outer tub 20;

[0054] Drum 30;

[0055] Agitator 40. Detailed implementation manners

[0056] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0057] Refer to Figures 1 - 11 to describe the drive system 10 of the washing machine 100 according to an embodiment of the present invention.

[0058] As Figures 1 - 4 shown, for the drive system 10 of the washing machine 100 according to an embodiment of the present invention, the washing machine 100 includes a drive system 10, an outer tub 20, a drum 30, and an agitator 40. The drum 30 is rotatably provided in the outer tub 20, and the agitator 40 is rotatably provided at the bottom of the drum 30, wherein the bottom of the drum 30 faces the open mouth of the drum 30. For example, as Figure 3 shown, the drum 30 has a laundry chamber therein, and an open mouth is formed at the front of the laundry chamber, and the agitator 40 is rotatably provided at the rear of the laundry chamber.

[0059] As Figures 1 - 4 shown, the drive system 10 may include an agitator shaft 1, a drum shaft sleeve 2, a bracket assembly 3, a motor 4, a belt drive mechanism 5, a gear drive mechanism 6, and a clutch mechanism 7.

[0060] Referring to Figure 3 shown, the first end of the agitator shaft 1 (for example, the front end as Figure 3 shown) is adapted to be connected to the agitator 40. The drum shaft sleeve 2 is sleeved on the outer periphery of the agitator shaft 1. The agitator shaft 1 is rotatable relative to the drum shaft sleeve 2 to drive the agitator 40 to rotate. The first end of the drum shaft sleeve 2 (for example, the rear end as Figure 3 shown) is adapted to be connected to the drum 30, and the drum shaft sleeve 2 can drive the drum 30 to rotate.

[0061] Referring to Figure 3As shown, the drum bushing 2 is provided on the bracket assembly 3 and is rotatable relative to the bracket assembly 3. The bracket assembly 3 is adapted to be connected to the outer tub 20. The motor 4 is an inner rotor motor 4, and the motor 4 is adapted to be connected to the outer tub 20. Thus, it is beneficial to reduce the cost and energy consumption of the motor 4. For example, the motor 4 is a BLDC inner rotor motor (brushless DC inner rotor motor).

[0062] As Figure 2 shown, the belt drive mechanism 5 includes a pulley 51 and a belt 52. One end of the belt 52 is sleeved on the outer peripheral side of the output shaft 41 of the motor 4, and the other end of the belt 52 is sleeved on the outer peripheral side of the pulley 51. The pulley 51 is connected to the second end of the drum bushing 2. The second end of the agitator shaft 1 is connected to the belt drive mechanism 5 through a gear drive mechanism 6. When the motor 4 operates, the belt drive mechanism 5 transmits the power of the motor 4 to the drum bushing 2, driving the drum bushing 2 to rotate; at the same time, the belt drive mechanism 5 transmits the power of the motor 4 to the gear drive mechanism 6, and then through the gear drive mechanism 6 to the agitator shaft 1, thereby driving the agitator shaft 1 to rotate.

[0063] It can be understood that the agitator shaft 1 is a slender shaft, and the diameter of the drum bushing 2 is larger than that of the agitator shaft 1. Compared with directly fixing the rotor of a traditional motor on the agitator shaft, by connecting the pulley 51 to the second end of the drum bushing 2, it is beneficial to improve the rigidity of the drive system 10, and the pulley 51 occupies less space in the length direction of the agitator shaft 1 compared to the motor 4. Thus, it is beneficial to reduce the axial dimension of the drive system 10. In addition, by transmitting the power of the motor 4 to the gear drive mechanism 6 through the belt 52 and the pulley 51, it can play a role in reducing the speed and increasing the torque, thereby ensuring the starting torque of the washing machine 100.

[0064] As Figure 1 and Figure 2As shown, the clutch mechanism 7 can be selectively engaged with either the gear transmission mechanism 6 or the bracket assembly 3. When the clutch mechanism 7 is engaged with the gear transmission mechanism 6, the agitator shaft 1 and the drum bushing 2 rotate synchronously; when the clutch mechanism 7 is engaged with the bracket assembly 3, the agitator shaft 1 and the drum bushing 2 rotate differentially. Herein, "the agitator shaft 1 and the drum bushing 2 rotate synchronously" means that the agitator shaft 1 and the drum bushing 2 rotate in the same direction and at the same angular velocity, and "the agitator shaft 1 and the drum bushing 2 rotate differentially" means that the agitator shaft 1 and the drum bushing 2 rotate at different angular velocities, and the differential rotation can be differential rotation in the same direction or differential rotation in the opposite direction. Thus, the agitator shaft 1 and the drum bushing 2 can be switched between the synchronous rotation and differential rotation modes. In the washing operation, by controlling whether the agitator shaft 1 and the drum bushing 2 rotate differentially, it is possible to control whether the drum 30 and the agitator 40 rotate differentially (i.e., switch between the dual-output and single-output washing modes), so that the washing machine 100 can adapt to different materials of clothes. For example, during washing, the washing machine 100 can be switched to the single-output washing state (the agitator shaft 1 and the drum bushing 2 rotate synchronously). At this time, the washing machine 100 has the advantage of not damaging the clothes and can wash clothes that need to be gently washed, such as cashmere or silk; when the washing machine 100 is switched to the dual-output washing state (the agitator shaft 1 and the drum bushing 2 rotate differentially), the washing machine 100 has a strong cleaning ability at this time and can wash clothes with stubborn stains or washable materials.

[0065] For the drive system 10 of the washing machine 100 according to an embodiment of the present invention, by making the motor 4 an inner rotor motor and transmitting the power of the motor 4 to the internal gear ring 61 through the belt 52 and the belt pulley 51, it is possible to reduce the cost and energy consumption of the motor 4 on the basis of ensuring the starting torque of the washing machine 100, which is beneficial to reducing the cost and energy consumption of the drive system 10. Compared with the traditional method of fixing the motor on the motor shaft, by connecting the belt pulley 51 to the second end of the drum bushing 2, it is beneficial to improve the rigidity of the drive system 10 and is beneficial to reducing the axial dimension of the drive system 10. In addition, when the clutch mechanism 7 is engaged with the gear transmission mechanism 6, the agitator shaft 1 and the drum bushing 2 rotate synchronously; when the clutch mechanism 7 is engaged with the bracket assembly 3, the agitator shaft 1 and the drum bushing 2 rotate differentially, so that the agitator shaft 1 and the drum bushing 2 can be switched between the synchronous rotation and differential rotation modes, so that the washing machine 100 can adapt to different materials of clothes.

[0066] In some embodiments of the present invention, such as Figure 2As shown, the pulley 51 has a central hole 511, and a first spline portion 512 is formed on the inner peripheral wall of the central hole 511. The second end of the drum bushing 2 has a pulley connection portion 21. The pulley connection portion 21 is fitted in the central hole 511, and a second spline portion 211 that mates with the first spline portion 512 is formed on the pulley connection portion 21. Thus, through the mating of the first spline portion 512 on the inner peripheral wall of the central hole 511 and the second spline portion 211 on the pulley connection portion 21, it is beneficial to improve the connection strength between the pulley 51 and the drum bushing 2, thereby improving the stability of the pulley 51 driving the drum bushing 2 to work.

[0067] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the bracket assembly 3 includes a bearing bracket 31 and a rear shell 32 that are connected to each other. A bearing is provided on the bearing bracket 31, and the bearing is sleeved on the outer periphery of the drum bushing 2. The rear shell 32 is provided on one axial side of the bearing bracket 31. A receiving space is defined between the bearing bracket 31 and the rear shell 32. The belt transmission mechanism 5, the gear transmission mechanism 6, and the clutch mechanism 7 are all located in the receiving space. Thus, the belt transmission mechanism 5, the gear transmission mechanism 6, and the clutch mechanism 7 are isolated from the external environment, which is beneficial to improving the working stability of the belt transmission mechanism 5, the gear transmission mechanism 6, and the clutch mechanism 7.

[0068] For example, as Figure 1 shown, the bearing bracket 31 is fixedly connected to the outer tub 20. A first bearing chamber 311 and a second bearing chamber 312 are respectively provided at the front and rear ends of its inner hole. The outer rings of the first bearing 86 and the second bearing 87 are respectively fixedly installed in the first bearing chamber 311 and the second bearing chamber 312. The drum bushing 2 is rotatably installed in the inner hole of the bearing bracket 31 through the first bearing 86 and the second bearing 87. A pulley connection portion 21 is provided at the rear end of the drum bushing 2. The pulley 51 is fixedly connected to the pulley connection portion 21 with an opening facing backward. The drum bushing 2 is a hollow structure. Combining Figure 1 and Figure 11 shown, the agitator shaft 1 is rotatably arranged in the drum bushing 2 through a first bushing 81 and a second bushing 82 press-fitted in the inner hole of the drum bushing 2.

[0069] Optionally, the bearing bracket 31 is an integrally formed part. Thus, it is beneficial to improve the support stiffness of the bearing bracket 31.

[0070] In some embodiments of the present invention, as Figure 6As shown, the drum bushing 2 is a hollow rotary structure. The outer peripheral wall of the drum bushing 2 is successively provided with a drum connection part 22, a large oil seal connection part 23, a bearing installation part 24, and a pulley connection part 21 from front to back. The inner hole of the drum bushing 2 is successively provided with a small oil seal installation part 25, a first bushing installation part 26, a second bushing installation part 27, and an avoidance groove 28 from front to back. During assembly, refer to Figure 1 As shown, the drum bushing 2 is assembled into the bearing hole from the end of the first bearing 86. The bearing installation part 24 is installed in the inner holes of the first bearing 86 and the second bearing 87, so that the drum bushing 2 is pivotally installed inside the bearing bracket 314. The front end of the drum bushing 2 is fixedly connected to the drum 30 through the drum connection part 22, and the pulley connection part 21 at the rear end is fixedly connected to the pulley 51.

[0071] Furthermore, the agitator shaft 1 is successively provided with an agitator connection part 11, a small oil seal installation part 25, a bushing installation part 13, a first shaft shoulder 14, and a second shaft shoulder 15 from front to back. The agitator shaft 1 is rotatably supported in the inner hole of the drum bushing 2 through the first bushing 81 and the second bushing 82. The agitator shaft 1 is axially limited forward by the first shaft shoulder 14 to the second bushing 82; on the side where the agitator shaft 1 penetrates out of the first bushing 81, an adjusting washer 93 is assembled to adjust the axial play between the agitator shaft 1 and the drum bushing 2, and then is axially limited backward to the first bushing 81 through a snap ring 94 arranged at the front end of the adjusting washer 93; the front end of the agitator shaft 1 is fixedly connected to the agitator 40 through the agitator connection part 11, and a sun gear 62 is fixedly connected to the rear end and is limited by the second shaft shoulder 15. Thus, the operation of the agitator shaft 1 can be stable and reliable.

[0072] Optionally, a seal is provided between the bearing bracket 31, the drum bushing 2, and the agitator shaft 1. The seal includes a large water seal 91 and a small water seal 92. The large water seal 91 is fixedly installed in the inner hole at the front end of the bearing bracket 31 and is hermetically connected to the drum bushing 2 inwardly; the small water seal 92 is fixedly installed in the inner hole at the front end of the drum bushing 2 and is hermetically connected to the agitator shaft 1 inwardly. Specifically, as Figure 1 shown, the large water seal 91 is fixed at the front end of the bearing bracket 31. The inner hole of the bearing bracket 31 is provided with a first sealing lip 911, which abuts against the large oil seal connection part 23 of the drum bushing 2; the outer ring of the small water seal 92 is fixedly connected to the small oil seal installation part 25 of the drum bushing 2, and the small water seal 92 is provided with a third sealing lip 921 inwardly, and the third sealing lip 921 abuts against the small oil seal connection part 12 of the agitator 40 shaft.

[0073] In some alternative embodiments of the present invention, as Figure 2As shown, an avoidance notch 321 is formed on the outer peripheral wall of the rear housing 32. One end of the belt 52 passes through the avoidance notch 321 and is sleeved on the outer peripheral side of the output shaft 41. Thus, by providing the avoidance notch 321, it is convenient for the two ends of the belt 52 to be connected to the output shaft 41 and the pulley 51 respectively, avoiding interference between the belt 52 and the rear housing 32. For example, the motor 4 is fixedly connected to the outer barrel 20, the motor 4 shaft is arranged parallel to the agitator shaft 1, one end of the belt 52 is sleeved on the outer peripheral side of the output shaft 41 of the motor 4, the other end is sleeved on the outer peripheral side of the pulley 51, the rear housing 32 is fixedly connected to the rear end face of the bearing bracket 31 with the opening facing forward, and is sleeved outside the belt 52 without contact. An avoidance notch 321 adapted to avoid the belt 52 is provided on one side of the rear housing 32, and the belt 52 passes through the avoidance notch 321 to be connected to the motor 4.

[0074] In some embodiments of the present invention, as Figure 2 and Figure 11 shown, the gear transmission mechanism 6 includes: an internal gear ring 61, a sun gear 62, a planet carrier assembly 63 and planet gears 64. The internal gear ring 61 is connected to the pulley 51 and coaxially arranged. When the clutch mechanism 7 cooperates with the internal gear ring 61, the agitator shaft 1 and the drum shaft sleeve 2 rotate synchronously. The sun gear 62 is connected to the agitator shaft 1 and coaxially arranged with the agitator shaft 1. The sun gear 62 is located inside the internal gear ring 61. The planet carrier assembly 63 has a plurality of planet gear shafts 6315. The planet carrier assembly 63 is sleeved on the outer periphery of the agitator shaft 1 and is rotatable relative to the agitator shaft 1. The planet gears 64 are multiple and are respectively rotatably sleeved on the plurality of planet gear shafts 6315. The multiple planet gears 64 are located between the internal gear ring 61 and the sun gear 62 and are arranged around the outer periphery of the sun gear 62. The planet gears 64 are meshed with both the internal gear ring 61 and the sun gear 62.

[0075] It should be noted that when the clutch mechanism 7 cooperates with the internal gear ring 61, the planet carrier assembly 63 is fixedly connected to the internal gear ring 61, so as to realize the same angular velocity operation of the internal gear ring 61, the planet carrier assembly 63, the planet gears 64, the sun gear 62 and the agitator shaft 1. And because the internal gear ring 61 and the drum shaft sleeve 2 are both connected to the pulley 51 and coaxially arranged, the agitator shaft 1 and the drum shaft sleeve 2 rotate synchronously; when the clutch mechanism 7 cooperates with the bracket assembly 3, the planet carrier assembly 63 is fixedly connected to the bracket assembly 3, the belt transmission mechanism 5 transmits the power of the motor 4 to the drum shaft sleeve 2, driving the drum shaft sleeve 2 to rotate; at the same time, the belt transmission mechanism 5 transmits the power of the motor 4 to cooperate with the internal gear ring 61, and then drives the planet gears 64 to rotate around the planet gear shafts 6315 through the internal gear ring 61. The planet gears 64 drive the central gear to rotate, the central gear drives the agitator shaft 1 to rotate, and the agitator shaft 1 and the drum shaft sleeve 2 rotate differentially. Thus, the structure is simple, and it is convenient for the agitator shaft 1 and the drum shaft sleeve 2 to realize synchronous rotation and differential rotation.

[0076] Optionally, as Figure 2As shown, multiple planet gears 64 are grouped together, and each planet gear 64 is directly meshed with the internal gear ring 61 and the sun gear 62. Thus, when the clutch mechanism 7 cooperates with the bracket assembly 3, the agitator shaft 1 and the drum bushing 2 can rotate with reverse differential speed.

[0077] In some alternative embodiments of the present invention, multiple planet gears 64 are two groups that mesh with each other. One group of the two groups of planet gears 64 meshes with the internal gear ring 61 and the other group meshes with the sun gear 62. Thus, when the clutch mechanism 7 cooperates with the bracket assembly 3, the agitator shaft 1 and the drum bushing 2 rotate with coaxial differential speed. For example, multiple planet gears 64 are divided into a first group of planet gears and a second group of planet gears. The first group of planet gears is arranged adjacent to the center of the internal gear ring 61 and meshes with the sun gear 62. The second group of planet gears is arranged away from the center of the internal gear ring 61 and meshes with the internal gear ring 61 and the first group of planet gears respectively.

[0078] Optionally, as Figure 6 shown, an avoidance groove 28 is formed on the inner peripheral wall of the second end of the drum bushing 2. The avoidance groove 28 penetrates the axial end face of the second end of the drum bushing 2. A part of the planet carrier assembly 63 is accommodated in the avoidance groove 28, and the planet carrier assembly 63 is spaced apart from the drum bushing 2. Thus, it is beneficial to reduce the axial dimension of the drive system 10.

[0079] In some alternative embodiments of the present invention, as Figure 1 shown, the internal gear ring 61 is integrally injection-molded on the pulley 51. Thus, the integrally injection-molded structure can not only ensure the structural and performance stability of the internal gear ring 61 and the pulley 51, but also eliminate redundant fittings and connection processes, greatly improving the assembly efficiency between the internal gear ring 61 and the pulley 51 and ensuring the connection reliability between the internal gear ring 61 and the pulley 51.

[0080] Optionally, as Figure 1 、 Figure 2 and Figure 7As shown, the clutch mechanism 7 includes a clutch sliding sleeve 71, an electromagnetic coil assembly 72, and a clutch spring 73. A third spline portion 711 is formed on the inner peripheral wall of the clutch sliding sleeve 71. The planet carrier assembly 63 includes a planet carrier 631 and a cover plate 632 that are connected to each other. The internal gear ring 61 is rotatably disposed between the outer peripheral wall of the planet carrier 631 and the inner peripheral wall of the cover plate 632. An installation space is defined between the planet carrier 631 and the cover plate 632. The sun gear 62 and multiple planet gears 64 are both located in the installation space. A fourth spline portion 6321 that mates with the third spline portion 711 is formed on the outer peripheral wall of the cover plate 632. And the clutch sliding sleeve 71 is axially slidable relative to the cover plate 632 between a first position and a second position. Thus, through the cooperation of the third spline portion 711 and the fourth spline portion 6321, on the one hand, it can guide the movement of the clutch sliding sleeve 71 relative to the cover plate 632 in the axial direction, and on the other hand, it can prevent the clutch sliding sleeve 71 from rotating relative to the cover plate 632, so that the sliding of the clutch sliding sleeve 71 between the first position and the second position in the axial direction is stable and reliable. For example, the planet carrier 631 and the cover plate 632 are fixedly connected through support columns 6311 and support column through holes 6323.

[0081] Further, when the electromagnetic coil assembly 72 is energized, the electromagnetic coil assembly 72 is adapted to drive the clutch sliding sleeve 71 to slide axially toward a first direction (for example, forward as shown in Figure 1 ), and the clutch spring 73 is used to drive the clutch sliding sleeve 71 to slide toward a second direction opposite to the first direction (for example, backward as shown in Figure 1 ). When the clutch sliding sleeve 71 slides toward the first direction to the first position, the clutch sliding sleeve 71 cooperates with the internal gear ring 61. When the clutch sliding sleeve 71 slides toward the second direction to the second position (the position of the clutch sliding sleeve 71 as shown in Figure 1 ), the clutch sliding sleeve 71 cooperates with the bracket assembly 3. Thus, the sliding of the clutch sliding sleeve 71 is stable and reliable. And when the clutch sliding sleeve 71 cooperates with the internal gear ring 61, the synchronous rotation of the wave wheel shaft 1 and the drum shaft sleeve 2 can be realized. When the clutch sliding sleeve 71 cooperates with the bracket assembly 3, the wave wheel shaft 1 and the drum shaft sleeve 2 rotate differentially.

[0082] Optionally, as shown in Figure 7As shown in the figure, the clutch sliding sleeve 71 includes a non-magnetic toothed part 714 and a magnetic conductive sleeve 715, which are radially fitted and integrally formed. The magnetic conductive sleeve 715 is arranged on the outer ring of the non-magnetic toothed part 714. A fourth spline part 6321 is fixedly arranged on the outer ring of the cover plate 632. The clutch sliding sleeve 71 is axially slidably sleeved on the outside of the fourth spline part 6321 of the cover plate 632 through a third spline part 711 fixedly arranged on the inner hole; first clutch teeth 712 and third clutch teeth 713 are respectively arranged at both ends of the non-magnetic toothed part 714; an annular flange 612 is integrally arranged on the end surface of the inner gear ring 61 facing away from the gear part, and second clutch teeth 611 evenly distributed in the circumferential direction are fixedly arranged on one side of the flange 612 facing the gear transmission mechanism 6.

[0083] Optionally, the second clutch teeth 611 and the inner gear ring 61 are integrally injection molded, and the fourth clutch teeth 322 and the rear shell 32 are integrally injection molded.

[0084] Optionally, as Figure 1 shown, the planet carrier 631 and the cover plate 632 are of a hollow structure, and a third bushing 83 and a fourth bushing 84 are respectively fixedly arranged on the inner holes, and are rotatably and loosely sleeved on the pulsator shaft 1 through the third bushing 83 and the fourth bushing 84. The sun gear 62 is arranged between the third bushing 83 and the fourth bushing 84; a third bushing mounting part 6312 integrally arranged on the planet carrier 631 is inserted into the avoidance groove 28 of the drum bushing 2 and is axially limited by the first shoulder 14. The double-end support improves the connection stiffness of the entire gear transmission mechanism 6, avoids the insufficient rigidity caused by single-sided support, can reduce the washing noise, improve the stability of the whole machine, and at the same time, the setting of the avoidance groove 28 compresses the axial dimension.

[0085] Optionally, as Figure 1 、 Figure 2 and Figure 11 shown, the planet carrier assembly 63 includes a planet carrier 631 and a cover plate 632 fixedly connected. A plurality of planet gear shafts 6315 are circumferentially distributed between the planet carrier 631 and the cover plate 632. The inner gear ring 61 is coaxially fixedly arranged on the pulley 51. The cover plate 632 is of a cup-shaped structure. The planet carrier 631 is located inside the cup-shaped structure. The inner gear ring 61 is arranged between the outer ring of the planet carrier 631 and the inner wall of the cover plate 632, and the inner peripheral wall of the inner gear ring 61 meshes with the planet gear 64 for transmission.

[0086] Furthermore, as Figure 8 and Figure 9As shown, a number of first mounting holes 6313 and second mounting holes 6322 are circumferentially distributed between the planet carrier 631 and the cover plate 632. The first mounting holes 6313 and the second mounting holes 6322 are arranged correspondingly, and a number of planet gear shafts 6315 are installed in the middle. The planet gears 64 are sleeved on the planet gear shafts 6315 and mesh with the sun gear 62 in the interior for transmission. The cover plate 632 is of a cup-shaped structure, and the planet carrier 631 is located inside the cup-shaped structure. The internal gear ring 61 is coaxially arranged between the outer ring of the planet carrier 631 and the inner wall of the cover plate 632. The internal teeth of the internal gear ring 61 mesh with the planet gears 64 for transmission.

[0087] Furthermore, as shown in Figure 8 and Figure 11 a first oil retaining portion 6314 integrally provided with an outward annular protrusion is arranged on the outer ring of the planet carrier 631, and a second oil retaining portion 615 integrally provided with an inward annular protrusion is arranged on the inner ring of the internal gear ring 61. When the assembly is completed, the gap between the first oil retaining portion 6314 and the second oil retaining portion 615 does not exceed 1 mm; the second oil retaining portion 615, the first oil retaining portion 6314, the cover plate 632 and the body of the internal gear ring 61 form a labyrinth structure to prevent the grease in the gear transmission mechanism 6 from splashing during operation.

[0088] In some alternative embodiments of the present invention, as shown in Figure 1 a clutch spring 73 is arranged between the bracket assembly 3 and the clutch sliding sleeve 71. It should be noted that when the washing machine 100 is in a non-working state, the clutch sliding sleeve 71 cooperates with the internal gear ring 61, the clutch spring 73 is compressed, and the clutch sliding sleeve 71 is located at the dehydration station. During washing, the electromagnetic coil assembly 72 is energized, and the clutch sliding sleeve 71 moves in a direction away from the internal gear ring 61 under the action of electromagnetic force and compresses the clutch spring 73, so that the clutch sliding sleeve 71 cooperates with the bracket assembly 3, the planet carrier assembly 63 is braked, the gear transmission mechanism 6 becomes a fixed-axis gear train, and the agitator shaft 1 and the drum shaft sleeve 2 rotate differentially; during dehydration, the electromagnetic coil assembly 72 is de-energized, and the clutch sliding sleeve 71 is reset under the action of the clutch spring 73, and the clutch sliding sleeve 71 enters into cooperation with the internal gear ring 61. At this time, the planet carrier assembly 63 is fixedly connected to the internal gear ring 61, and the entire gear transmission mechanism 6 rotates at the same speed, so that the agitator shaft 1 and the drum shaft sleeve 2 rotate synchronously. Thus, in the dehydration mode, the electromagnetic coil assembly 72 is not energized, so that when the power is cut off during dehydration, it is possible to avoid damage caused by the clutch sliding sleeve 71 colliding with the internal gear ring 61. For example, a spring mounting portion 716 is provided on the clutch sliding sleeve 71, and the clutch spring 73 is arranged between the spring mounting portion 716 and the rear shell 32.

[0089] Optionally, a clutch spring 73 is provided between the pulley 51 and the clutch sliding sleeve 71. It should be noted that when the washing machine 100 is in a non-operating state, the clutch sliding sleeve 71 cooperates with the bracket assembly 3, the clutch spring 73 is compressed, and the clutch sliding sleeve 71 is located at the washing station. During dehydration, the electromagnetic coil assembly 72 is energized, and the clutch sliding sleeve 71 moves in a direction away from the bracket assembly 3 under the action of electromagnetic force and compresses the clutch spring 73, so that the clutch sliding sleeve 71 cooperates with the internal gear ring 61. At this time, the planet carrier assembly 63 is fixedly connected to the internal gear ring 61, and the entire gear transmission mechanism 6 rotates at the same speed, so that the wave wheel shaft 1 and the drum shaft sleeve 2 rotate synchronously; during washing, the electromagnetic coil assembly 72 is de-energized, the clutch sliding sleeve 71 is reset under the action of the clutch spring 73, the clutch sliding sleeve 71 enters into cooperation with the bracket assembly 3, the planet carrier assembly 63 is braked, and the gear transmission mechanism 6 becomes a fixed-axis gear train, and the wave wheel shaft 1 and the drum shaft sleeve 2 rotate differentially. Thus, during washing, the electromagnetic coil assembly 72 is not energized, which can reduce the energy consumption of the washing machine 100. For example, as Figure 7 shown, a spring mounting portion 716 is provided on the clutch sliding sleeve 71, and the clutch spring 73 is disposed between the spring mounting portion 716 and the pulley 51.

[0090] In some alternative embodiments of the present invention, as Figure 7 shown, a plurality of first clutch teeth 712 arranged circumferentially are formed on the first axial end face of the clutch sliding sleeve 71, second clutch teeth 611 that cooperate with the plurality of first clutch teeth 712 are formed on the internal gear ring 61, a plurality of third clutch teeth 713 arranged circumferentially are formed on the second axial end face of the clutch sliding sleeve 71, and fourth clutch teeth 322 that cooperate with the plurality of third clutch teeth 713 are formed on the bracket assembly 3. Thus, by the engagement of the first clutch teeth 712 and the second clutch teeth 611, it is beneficial to improve the reliability when the clutch sliding sleeve 71 and the internal gear ring 61 cooperate, and by the cooperation of the third clutch teeth 713 and the fourth clutch teeth 322, it is beneficial to improve the reliability when the clutch sliding sleeve 71 and the bracket assembly 3 cooperate.

[0091] Optionally, as Figure 7 shown, in the axial direction of the clutch sliding sleeve 71, both the first clutch teeth 712 and the third clutch teeth 713 are formed in a stepped shape. Thus, on the one hand, it is beneficial to increase the cooperation area between the first clutch teeth 712 and the second clutch teeth 611, and it is beneficial to further improve the reliability when the clutch sliding sleeve 71 and the internal gear ring 61 cooperate; on the other hand, the stepped teeth are easy to engage, the total tooth height is small, and the clutch reliability and the compressed axial height can be effectively controlled. For example, both the first clutch teeth 712 and the third clutch teeth 713 are composed of a first straight tooth and a second straight tooth, the first straight tooth and the second straight tooth are perpendicular to each other, and the projections of the first clutch teeth 712 and the third clutch teeth 713 in the axial direction are both in a stepped shape.

[0092] Furthermore, asFigure 1 As shown, a fifth bushing 85 is press-fitted into the inner hole of the rear shell 32, and the planet carrier assembly 63 is pivotally mounted in the inner hole of the fifth bushing 85 through the fourth bushing mounting portion 6324. Preferably, the first bushing 81 to the fifth bushing 85 are made of oil-impregnated bearing material.

[0093] As Figures 1 - 11 As shown, the drum washing machine 100 according to an embodiment of the present invention includes: an outer tub 20, a pulsator 40, a drum 30, and the drive system 10 of the washing machine 100 described above. The drum 30 is rotatably disposed inside the outer tub 20, the pulsator 40 is rotatably disposed at the bottom of the drum 30, the first end of the pulsator shaft 1 is connected to the pulsator 40, the first end of the drum shaft sleeve 2 is connected to the drum 30, the bracket assembly 3 is connected to the outer tub 20, and the motor 4 is connected to the outer tub 20.

[0094] For the drum washing machine 100 according to an embodiment of the present invention, by providing the drive system 10 of the washing machine 100 described above, the motor 4 is an inner rotor motor, and the power of the motor 4 is transmitted to the internal gear ring 61 through the belt 52 and the belt pulley 51. Thus, on the basis of ensuring the starting torque of the washing machine 100, the cost and energy consumption of the motor 4 can be reduced, which is beneficial to reducing the cost and energy consumption of the drive system 10. And compared with the traditional method of fixing the motor on the motor shaft, by connecting the belt pulley 51 to the second end of the drum shaft sleeve 2, it is beneficial to improve the rigidity of the drive system 10 and is beneficial to reducing the axial dimension of the drive system 10. In addition, when the clutch mechanism 7 cooperates with the gear transmission mechanism 6, the pulsator shaft 1 and the drum shaft sleeve 2 rotate synchronously. When the clutch mechanism 7 cooperates with the bracket assembly 3, the pulsator shaft 1 and the drum shaft sleeve 2 rotate differentially. Thus, the pulsator shaft 1 and the drum shaft sleeve 2 can switch between two modes of synchronous rotation and differential rotation, so that the washing machine 100 can adapt to different materials of clothes.

[0095] For example, as Figure 1 As shown, when the clutch mechanism 7 fixes the planet carrier assembly 63 to the rear shell 32, the motor 4 transmits the power to the internal gear ring 61 in a speed-reducing and torque-increasing manner through the belt 52. The internal gear ring 61 transmits the power to the sun gear 62 in a speed-increasing and torque-reducing manner through the planetary gears. The sun gear 62 and the internal gear ring 61 drive the pulsator 40 and the drum 30 to rotate differentially through the drum shaft sleeve 2 and the pulsator shaft 1 respectively. When the clutch mechanism 7 fixes the internal gear ring 61 and the planet carrier assembly 63, the entire gear transmission mechanism 6 rotates at the same speed. The motor 4 transmits the power to the internal gear ring 61, and then drives the pulsator 40 and the drum 30 to rotate at the same speed through the gear transmission mechanism 6.

[0096] In some embodiments of the invention, the drum washing machine 100 can be switched between a dual-output mode and a single-output mode. It should be noted that by controlling whether the agitator 40 and the drum 30 are in a differential rotation state during washing, the purpose of switching between the single-output and dual-output washing modes can be achieved, realizing a drum washing machine 100 that can switch between the single-output and dual-output washing modes according to washing requirements, so that the drum washing machine 100 can adapt to clothes of different materials.

[0097] Specifically, the dual-output mode is as follows: Under the washing condition, the motor 4 runs at a low speed. The clutch mechanism 7 cooperates with the bracket assembly 3, and the pulley 51 drives the drum 30 to rotate at an equal speed ratio. The pulley 51 drives the agitator 40 to rotate through the gear transmission mechanism 6. The agitator shaft 1 rotates differentially with the drum bushing 2, and the speed ratio of the agitator 40 and the drum 30 is the transmission ratio of the gear transmission mechanism 6. At this time, the washing machine 100 is in the dual-output washing state, with strong washing ability, and can wash stubborn stains or clothes made of wash-resistant materials; Under the dehydration condition, the motor 4 runs at a high speed. The clutch mechanism 7 cooperates with the gear transmission mechanism 6, the agitator shaft 1 and the drum bushing 2 rotate synchronously, and the agitator 40 and the drum 30 rotate at the same high speed under the drive of the motor 4 through the pulley 51.

[0098] Specifically, the single-output mode is as follows: Under the washing condition, the motor 4 runs at a low speed. The clutch mechanism 7 cooperates with the gear transmission mechanism 6, and the agitator 40 and the drum 30 rotate at the same low speed under the drive of the motor 4 through the pulley 51. At this time, the washing machine 100 is in the single-output washing state, which has the advantage of not damaging clothes, and can wash clothes that need to be gently washed, such as cashmere or silk; Under the dehydration condition, the motor 4 runs at a high speed. The clutch mechanism 7 cooperates with the gear transmission mechanism 6, the agitator shaft 1 and the drum bushing 2 rotate synchronously, and the agitator 40 and the drum 30 rotate at the same high speed under the drive of the motor 4 through the pulley 51. At this time, when switching between washing and dehydration, the clutch mechanism 7 does not perform a station switch, and it can be realized through an electronic control program.

[0099] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0100] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A drive system for a washing machine, characterized in that, the washing machine includes the drive system, an outer tub, a drum, and a pulsator. The drum is rotatably provided within the outer tub, and the pulsator is rotatably provided at the bottom of the drum. The drive system includes: a pulsator shaft, a first end of the pulsator shaft being adapted to be connected to the pulsator; a drum bushing, the drum bushing being sleeved on the outer periphery of the pulsator shaft, the pulsator shaft being rotatable relative to the drum bushing, and a first end of the drum bushing being adapted to be connected to the drum; a bracket assembly, the drum bushing being provided on the bracket assembly and rotatable relative to the bracket assembly, the bracket assembly being adapted to be connected to the outer tub; a motor, the motor being an inner rotor motor, the motor being adapted to be connected to the outer tub; a belt drive mechanism, the belt drive mechanism including a pulley and a belt. One end of the belt is sleeved on the outer peripheral side of the output shaft of the motor, and the other end of the belt is sleeved on the outer peripheral side of the pulley. The pulley is connected to a second end of the drum bushing; a gear drive mechanism, a second end of the pulsator shaft being connected to the belt drive mechanism through the gear drive mechanism; a clutch mechanism, the clutch mechanism being selectively engaged with one of the gear drive mechanism and the bracket assembly. When the clutch mechanism is engaged with the gear drive mechanism, the pulsator shaft rotates synchronously with the drum bushing; when the clutch mechanism is engaged with the bracket assembly, the pulsator shaft rotates differentially with the drum bushing; the gear drive mechanism includes: an internal gear ring, the internal gear ring being connected to the pulley and coaxially arranged. When the clutch mechanism is engaged with the internal gear ring, the pulsator shaft rotates synchronously with the drum bushing; a sun gear, the sun gear being connected to the pulsator shaft and coaxially arranged with the pulsator shaft, the sun gear being located inside the internal gear ring; a planet carrier assembly, the planet carrier assembly being sleeved on the outer periphery of the pulsator shaft and rotatable relative to the pulsator shaft; a planet gear, the planet gear being meshed with both the internal gear ring and the sun gear; the clutch mechanism includes: a clutch sliding sleeve. The planet carrier assembly includes a planet carrier and a cover plate connected to each other. The internal gear ring is rotatably provided between the outer peripheral wall of the planet carrier and the inner peripheral wall of the cover plate. The clutch sliding sleeve is axially slidable relative to the cover plate between a first position and a second position; an electromagnetic coil assembly, when the electromagnetic coil assembly is energized, the electromagnetic coil assembly is adapted to drive the clutch sliding sleeve to slide axially in a first direction; a clutch spring for driving the clutch sliding sleeve to slide in a second direction opposite to the first direction. When the clutch sliding sleeve slides in the first direction to the first position, the clutch sliding sleeve is engaged with the internal gear ring. When the clutch sliding sleeve slides in the second direction to the second position, the clutch sliding sleeve is engaged with the bracket assembly.

2. The drive system for a washing machine according to claim 1, characterized in that, The pulley has a central hole, a first spline portion is formed on the inner peripheral wall of the central hole, the second end of the drum bushing has a pulley connection portion, the pulley connection portion is fitted in the central hole, and a second spline portion that mates with the first spline portion is formed on the pulley connection portion.

3. The drive system of the washing machine according to claim 1, wherein, the bracket assembly includes a bearing bracket and a rear shell connected to each other, a bearing is provided on the bearing bracket, and the bearing is sleeved on the outer periphery of the drum bushing, the rear shell is provided on an axial side of the bearing bracket, a receiving space is defined between the bearing bracket and the rear shell, and the belt transmission mechanism, the gear transmission mechanism, and the clutch mechanism are all located in the receiving space.

4. The drive system of the washing machine according to claim 3, wherein, the bearing bracket is an integrally formed part.

5. The drive system of the washing machine according to claim 3, wherein, an avoidance notch is formed on the outer peripheral wall of the rear shell, and one end of the belt passes through the avoidance notch and is sleeved on the outer peripheral side of the output shaft.

6. The drive system of the washing machine according to any one of claims 1-5, wherein, the planet carrier assembly has a plurality of planet gear shafts; there are a plurality of the planet gears, which are respectively rotatably sleeved on the plurality of planet gear shafts, and the plurality of planet gears are located between the internal gear ring and the sun gear and are arranged around the outer periphery of the sun gear.

7. The drive system of the washing machine according to claim 6, wherein, the plurality of planet gears are in a group, and each planet gear directly meshes with the internal gear ring and the sun gear.

8. The drive system of the washing machine according to claim 6, wherein, the plurality of planet gears are in two mutually meshing groups, one of the two groups of planet gears meshes with the internal gear ring and the other group meshes with the sun gear.

9. The drive system of the washing machine according to claim 6, wherein, an avoidance groove is formed on the inner peripheral wall of the second end of the drum bushing, the avoidance groove penetrates the axial end face of the second end of the drum bushing, a part of the planet carrier assembly is received in the avoidance groove, and the planet carrier assembly is spaced apart from the drum bushing.

10. The drive system of the washing machine according to claim 6, wherein, the internal gear ring is integrally injection-molded on the pulley.

11. The drive system of the washing machine according to claim 6, wherein, a third spline portion is formed on the inner peripheral wall of the clutch sliding sleeve, an installation space is defined between the planet carrier and the cover plate, the sun gear and the plurality of planet gears are all located in the installation space, and a fourth spline portion that mates with the third spline portion is formed on the outer peripheral wall of the cover plate.

12. The drive system of the washing machine according to claim 11, wherein, the clutch spring is provided between the bracket assembly and the clutch sliding sleeve.

13. The drive system of the washing machine according to claim 11, wherein, the clutch spring is provided between the pulley and the clutch sliding sleeve.

14. The drive system of the washing machine according to claim 11, wherein, a plurality of first clutch teeth arranged circumferentially are formed on the first axial end face of the clutch sliding sleeve, second clutch teeth cooperating with the plurality of first clutch teeth are formed on the internal gear ring, a plurality of third clutch teeth arranged circumferentially are formed on the second axial end face of the clutch sliding sleeve, and fourth clutch teeth cooperating with the plurality of third clutch teeth are formed on the bracket assembly.

15. The drive system of the washing machine according to claim 14, wherein, in the axial direction of the clutch sliding sleeve, both the first clutch teeth and the third clutch teeth are formed in a stepped shape.

16. A drum washing machine, wherein, comprising: an outer tub; a drum rotatably arranged in the outer tub; a pulsator rotatably arranged at the bottom of the drum; the drive system of the washing machine according to any one of claims 1-15, the first end of the pulsator shaft is connected to the pulsator, the first end of the drum shaft sleeve is connected to the drum, the bracket assembly is connected to the outer tub, and the motor is connected to the outer tub.

Images