Washing machine driving system

Abstract

A washing machine drive system is provided. A washing machine driving system according to one aspect of the present specification includes: a cover body; the motor fixing piece is combined with the cover body; a rotor facing the stator; an output shaft coupled to the rotor and coupled to the cover body by a bearing; a planetary gear set splined to the outer peripheral surface of the output shaft; the clutch fixing piece is combined with the motor fixing piece; a clutch movable member that is spline-coupled to the outer peripheral surface of the planetary gear set so as to be movable in the vertical direction, and that faces the clutch fixed member; the clutch fixture includes first to third coils arranged side by side in the vertical direction.

Description

Technical Field

[0001] The present specification relates to a washing machine driving system, and more particularly, to a washing machine driving system including a clutch. Background Art

[0002] The washing machine is driven in two main operation modes (washing mode, dehydration mode) having different operation conditions.

[0003] In order to simultaneously meet the above two main operating modes, the washing machine is equipped with a planetary gear set and a clutch, so that the output shaft can operate at a low speed and high torque with a gear ratio of n:1 (washing mode), or the output shaft can operate at a high speed and low torque with a gear ratio of 1:1 (spinning mode).

[0004] Here, the output shaft refers to a shaft coupled to the drum to rotate the drum. The drum may be referred to as an "inner tub".

[0005] That is, in a general washing machine, after the washing mode or the rinsing mode is finished, the motor is temporarily stopped and a drainage operation is performed. Then, after the drainage operation is finished, a dehydration initial mode is started.

[0006] However, in the dehydration initial mode, in order to initially start the wet laundry, a high torque is required, and thus the output shaft must be operated at a low speed and a high torque.

[0007] In addition, after the dehydration initial mode is completed, in order to start the dehydration mode, the output shaft must be operated at a high speed and low torque.

[0008] Therefore, the driving system of the washing machine is provided with components such as a planetary gear set and a clutch for converting the rotational force of the rotor shaft transmitted to the output shaft between the dehydration initial mode and the dehydration mode.

[0009] As an example of a prior art patent (related art) related to this specification, Korean Patent Registration No. KR10-1920812 (hereinafter referred to as "the prior art patent") discloses a structure for changing a gear ratio by moving the position of a reduction coupling unit including a planetary gear set forward and backward using a lever.

[0010] In other words, in the case of the prior art patent, in the dehydration initial mode, the reduction coupling unit moves forward according to the operation of the lever of the lever unit, thereby engaging the teeth formed on the coupling cap of the reduction coupling unit with the teeth formed on the drum, so that the washing machine operates at low speed and high torque.

[0011] Moreover, in the dehydration mode, the reduction coupling unit moves backward according to the operation of the lever of the lever unit, whereby the teeth formed on the coupling cover of the reduction coupling unit mesh with the teeth formed on the rotor housing, so that the washing machine operates at high speed and low torque.

[0012] However, according to the drive system disclosed in the above-mentioned existing patent, the pinion gear of the planetary carrier arranged in the reduction coupling unit must move in the axial direction relative to the sun gear, so the pinion gear and the sun gear can only use spur gears but not helical gears, so there is a problem of noise generation.

[0013] In addition, there is a problem that the reduction coupling unit can be moved forward and backward only when the motor is stopped, and therefore the motor must be stopped in order to switch the mode.

[0014] In addition, the sun gear provided in the planetary gear set is placed on a bearing on the output shaft, and the output shaft is supported by only one bearing.

[0015] Therefore, in the dehydration initial mode, the planetary gear set acts as a supporting point, and the output shaft is supported by the planetary gear set and the bearings, but in the dehydration mode, the rotor, the planetary gear set and the output shaft operate as a whole and the output shaft is supported by only one bearing, so there is a problem of low durability in the dehydration mode operating at high speed and low torque. Summary of the invention

[0016] Problem that the invention aims to solve

[0017] An object of the present specification is to provide a washing machine driving system that realizes a neutral mode of a clutch and can apply a reduction ratio while maintaining the rotation of a rotor.

[0018] Another problem to be solved by the present specification is to provide a driving system for a washing machine that can generate a high torque by applying a reduction ratio without stopping the rotation of a rotor.

[0019] In addition, the present invention aims to provide a washing machine driving system in which helical gears can be applied to the specific structure of a planetary gear set.

[0020] Another problem to be solved by the present specification is to provide a driving system for a washing machine that can improve space efficiency while changing the rotation speed of a sun gear and the rotation speed of a planetary carrier.

[0021] Another problem to be solved by the present specification is to provide a driving system for a washing machine that can improve space efficiency while changing the rotation speed of a planetary carrier and the rotation speed of a ring gear.

[0022] Another problem to be solved by the present specification is to provide a washing machine driving system that can stop the rotation of a ring gear spline-connected to a clutch movable element by coupling a clutch movable element to a clutch fixed element.

[0023] Another problem to be solved by the present specification is to provide a washing machine driving system that can rotate a ring gear spline-connected to the clutch movable element together with the rotor by coupling the clutch movable element to the rotor.

[0024] Another problem to be solved by the present specification is to provide a washing machine driving system which can maintain the position of the clutch movable member even if the supply of current is stopped after the clutch movable member moves in the vertical direction, thereby reducing power consumption.

[0025] In addition, the problem to be solved by this specification is to provide a driving system for a washing machine which can improve space efficiency and reduce volume.

[0026] Another problem to be solved by the present specification is to provide a washing machine driving system which can maintain the position of a clutch movable element even when the supply of current to the first to third coils is stopped by forming three stable points.

[0027] Means used to solve problems

[0028] In order to solve the above-mentioned problems, according to one aspect of the present specification, a washing machine drive system includes: a cover body; a motor fixing part, which is combined with the above-mentioned cover body; a rotor, which faces the above-mentioned motor fixing part; an output shaft, which is combined with the above-mentioned cover body bearing; a planetary gear set, which is combined with the above-mentioned rotor and is spline-connected to the outer circumference of the above-mentioned output shaft; a clutch fixing part, which is combined with the above-mentioned motor fixing part; and a clutch movable part, which is spline-connected to the outer circumference of the above-mentioned planetary gear set in a manner that can move in the vertical direction and faces the above-mentioned clutch fixing part.

[0029] In this case, the clutch fixing part may include a first coil, a second coil and a third coil arranged side by side in a vertical direction; when the first coil is supplied with current, the clutch movable part is fixed to the rotor and transmits the rotational force of the rotor to the output shaft at a 1:1 ratio; when the third coil is supplied with current, the clutch movable part is fixed to the clutch fixing part and reduces the rotational force of the rotor at a gear ratio of n:1 and transmits it to the output shaft; when the second coil is supplied with current, the clutch movable part is released from the rotor or the clutch fixing part.

[0030] Thereby, a neutral mode of the clutch is achieved, so that the reduction ratio can be applied while maintaining the rotation of the rotor.

[0031] In addition, the dehydration initial mode is entered by applying the reduction ratio without stopping the rotation of the rotor, so high torque can be generated.

[0032] In addition, the above-mentioned planetary gear set may include: a sun gear, which is combined with the above-mentioned rotor; a plurality of pinion gears, which are combined with the outer peripheral surface of the above-mentioned sun gear and are arranged to be separated in the circumferential direction; a ring gear, whose inner peripheral surface is combined with the above-mentioned plurality of pinion gears, and the outer peripheral surface is spline-connected with the above-mentioned clutch movable part; a planetary carrier, which is combined with the above-mentioned plurality of pinion gears and is spline-connected with the outer peripheral surface of the above-mentioned output shaft.

[0033] Therefore, since there is no need for the pinion gear to move relative to the sun gear axis direction, the helical gear can be applied to the specific structure of the planetary gear set.

[0034] In addition, a sun gear bearing disposed between the planetary carrier and the sun gear may be further included.

[0035] Thus, the rotation speed of the sun gear and the rotation speed of the planetary carrier can be made different and the space efficiency can be improved.

[0036] In addition, the sun gear bearing may overlap with the first coil and the second coil in a direction perpendicular to the output shaft.

[0037] Thereby, the size of the driving system of the washing machine can be reduced.

[0038] In addition, a ring gear bearing disposed between the planetary carrier and the ring gear may be further included.

[0039] This allows the rotation speed of the planetary carrier and the rotation speed of the ring gear to be different from each other and improves space efficiency.

[0040] Furthermore, a vertical center region of the plurality of pinion gears is disposed between the first coil and the second coil in a direction perpendicular to the output shaft.

[0041] In addition, the plurality of pinions may overlap with the first coil and the second coil in a direction perpendicular to the output shaft, and may not overlap with the third coil in a direction perpendicular to the output shaft.

[0042] Furthermore, a top surface of the ring gear overlaps with the third coil in a direction perpendicular to the output shaft, and a bottom surface of the ring gear is arranged below the first coil in a direction perpendicular to the output shaft.

[0043] Thus, the size of the driving system of the washing machine can be reduced.

[0044] In addition, the clutch movable part includes a first clutch portion formed on its top surface, and the clutch fixed part includes a second clutch portion formed on a surface facing the top surface of the clutch movable part; when the third coil is supplied with current, the first clutch portion engages with the second clutch portion.

[0045] Thus, by coupling the clutch movable element to the clutch fixed element, the rotation of the ring gear spline-coupled to the clutch movable element can be stopped.

[0046] In addition, the clutch movable member includes a third clutch portion formed on its bottom surface; the rotor includes a fourth clutch portion formed on a surface facing the bottom surface of the clutch movable member; when the first coil is supplied with current, the third clutch portion can engage with the fourth clutch portion.

[0047] Thus, by coupling the clutch movable element to the rotor, the ring gear spline-coupled to the clutch movable element can be rotated together with the rotor.

[0048] In addition, the clutch movable member may include a clutch engaging portion and a clutch magnet, wherein the clutch engaging portion is spline-connected to the planetary gear set, and the clutch magnet is disposed at the clutch engaging portion and faces the clutch fixed member.

[0049] In this case, when the supply of current is stopped after the first coil is supplied with current, the clutch movable part is kept coupled with the rotor; when the supply of current is stopped after the third coil is supplied with current, the clutch movable part is kept coupled with the clutch fixed part; and when the supply of current is stopped after the second coil is supplied with current, the clutch movable part is released from the rotor or the clutch fixed part.

[0050] Thus, even if the supply of current is stopped after the clutch movable element moves in the vertical direction, the position of the clutch movable element is maintained, so that power consumption can be reduced.

[0051] In addition, a vertical length of the clutch magnet is 1.8 to 2.2 times a vertical length of each of the first coil, the second coil, and the third coil.

[0052] In addition, the clutch fixing member includes a fixing member coupling portion, a first core, a second core, and a third core. The fixing member coupling portion is coupled to the motor fixing member. The first core, the second core, and the third core are arranged on the fixing member coupling portion and arranged side by side in a vertical direction.

[0053] In this case, the first coil is configured on the first core, the second coil is configured on the second core, and the third coil is configured on the third core; the first core, the second core and the third core are respectively formed into the same shape, and the first coil, the second coil and the third coil are respectively formed into the same shape.

[0054] In addition, the fixing member coupling portion may include a circumferential portion extending inwardly along the circumferential direction on the top surface; a second clutch portion is disposed on the bottom surface of the circumferential portion; and the second clutch portion overlaps with the clutch movable member in the vertical direction.

[0055] This can improve the space efficiency of the washing machine driving system.

[0056] In addition, the clutch movable member may include a clutch engaging portion spline-coupled to the planetary gear set, and a clutch magnet disposed at the clutch engaging portion and facing the clutch fixed member.

[0057] In this case, when the first coil is supplied with current, the clutch magnet overlaps with the first coil, the second coil, the first core and the second core in the horizontal direction; when the second coil is supplied with current, the clutch magnet overlaps with the second coil, the first core, the second core and the third core in the horizontal direction; when the third coil is supplied with current, the clutch magnet overlaps with the second coil, the third coil, the second core and the third core in the horizontal direction.

[0058] In addition, when the first coil is supplied with current, the vertical center area of ​​the clutch magnet overlaps with the upper end area of ​​the first coil in the horizontal direction; when the second coil is supplied with current, the vertical center area of ​​the clutch magnet overlaps with the vertical center area of ​​the second coil in the horizontal direction; when the third coil is supplied with current, the vertical center area of ​​the clutch magnet overlaps with the lower end area of ​​the third coil in the horizontal direction.

[0059] Thus, three stable points are formed, and even when the supply of current to the first to third coils is stopped, the position of the clutch movable element can be maintained.

[0060] In addition, the clutch movable element and the clutch fixed element are arranged between the planetary gear set and the motor fixed element in a direction perpendicular to the output shaft.

[0061] In addition, the above-mentioned rotor may include a rotor housing and a rotor magnet, the rotor housing includes a disc portion and a cylindrical portion, the disc portion shares a center with the above-mentioned output shaft, the cylindrical portion extends upward radially outward of the disc portion, and the rotor magnet is arranged in the cylindrical portion and faces the motor fixing part.

[0062] In this case, the rotor magnet may overlap the second coil and the third coil in a direction perpendicular to the output shaft, and may not overlap the first coil in a direction perpendicular to the output shaft.

[0063] This can improve the space efficiency of the rotor and the motor fixture.

[0064] Technical Effects

[0065] According to the present specification, a washing machine driving system can be provided which realizes a neutral mode of a clutch and can apply a reduction ratio while maintaining the rotation of a rotor.

[0066] In addition, the present invention can provide a washing machine driving system that can apply a speed reduction ratio without stopping the rotation of a rotor so that high torque can be generated.

[0067] In addition, through the present specification, a washing machine driving system can be provided, which can apply helical gears to the specific structure of the planetary gear set.

[0068] In addition, the present specification can provide a washing machine driving system that can improve space efficiency while changing the rotation speed of the sun gear and the rotation speed of the planetary carrier.

[0069] In addition, the present specification can provide a washing machine driving system that can improve space efficiency while changing the rotation speed of the planet carrier and the rotation speed of the ring gear.

[0070] In addition, the present specification can provide a washing machine driving system that can stop the rotation of a ring gear spline-connected to the clutch movable member by combining the clutch movable member with the clutch fixed member.

[0071] In addition, according to the present specification, a washing machine driving system can be provided, which can rotate a ring gear spline-connected to the clutch movable member together with the rotor by coupling the clutch movable member to the rotor.

[0072] In addition, the present specification can provide a washing machine driving system that can maintain the position of the clutch movable part even if the supply of current is stopped after the clutch movable part moves in the vertical direction, thereby reducing power consumption.

[0073] In addition, the present specification can provide a washing machine driving system that can improve space efficiency and reduce volume.

[0074] In addition, according to the present specification, a washing machine driving system can be provided which can maintain the position of the clutch movable element even when the supply of current to the first coil to the third coil is stopped by forming three stable points. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 and Figure 2 is a perspective view of a washing tub and a driving system of a washing machine according to an embodiment of the present specification.

[0076] Figure 3 is a perspective view of a washing machine driving system according to an embodiment of the present specification.

[0077] Figure 4 1 is an exploded perspective view of a washing machine driving system according to an embodiment of the present specification.

[0078] Figure 5 is a cross-sectional perspective view of a washing machine driving system according to an embodiment of the present specification.

[0079] Figure 6 1 is a cross-sectional perspective view of a clutch movable member, a clutch fixed member, and a portion of a rotor of a washing machine driving system according to an embodiment of the present specification.

[0080] Figure 7 FIG. 1 is a diagram of a planetary gear set of a washing machine driving system according to an embodiment of the present specification, with an upper planet carrier removed.

[0081] Figure 8 is a cross-sectional view of a partial structure of a washing machine driving system according to an embodiment of the present specification.

[0082] Fig. 9 FIG. 1 is an enlarged view of a clutch movable member and a clutch fixed member region in a cross section of a washing machine driving system according to an embodiment of the present specification.

[0083] Figures 10 to 12 1 is an operation diagram of a clutch movable part in a washing machine driving system according to an embodiment of the present specification.

[0084] Fig.13 is a graph showing the z-axis force at the position of the movable member of the clutch of the washing machine driving system according to one embodiment of the present specification.

[0085] Figures 14 to 16 1 is a diagram showing the magnetic flux density distribution of the clutch stator at the position of the clutch movable member of the washing machine driving system according to one embodiment of the present specification.

[0086] Fig.17 and Fig.18 is a graph showing the z-axis force applied to the clutch magnet in the position of the clutch magnet of the washing machine driving system according to an embodiment of the present specification. DETAILED DESCRIPTION

[0087] Hereinafter, embodiments disclosed in the present disclosure will be described in detail with reference to the accompanying drawings, but the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and repeated description thereof will be omitted.

[0088] When describing the embodiments disclosed in this specification, when one component is referred to as being “connected” or “coupled” to another component, it can be understood that one component is directly connected or coupled to another component, but other components may be present in between.

[0089] In addition, when describing the embodiments disclosed in this specification, if it is determined that the specific description of the relevant known technology may obscure the main idea of ​​the embodiments disclosed in this specification, the detailed description will be omitted. In addition, the drawings are only for easy understanding of the embodiments disclosed in this specification, and it should be understood that the technical ideas disclosed in this specification are not limited by the drawings and include all changes, equivalents and substitutes included in the ideas and technical scope of this specification.

[0090] On the other hand, the term “discloser” can be replaced by terms such as “document”, “specification”, and “description”.

[0091] Figure 1 and Figure 2 is a perspective view of a washing tub and a driving system of a washing machine according to an embodiment of the present specification.

[0092] Reference Figure 1 and Figure 2 According to an embodiment of the present specification, a washing machine may include an inner tub 10, a pulsator 20 and a washing machine driving system 100, but it may also be implemented by excluding some of these structures, and additional structures are not excluded.

[0093] A washing machine according to an embodiment of the present specification may be a top loading type in which the rotation center of the inner drum 10 is designed to be perpendicular to the bottom surface and laundry can be put in from the top, or a front loading type in which the rotation center of the inner drum 10 is designed to be parallel to the bottom surface or gradually tilted downward toward the rear end and laundry can be put in from the front.

[0094] The inner tub 10 may be in the shape of a cylinder with an open top or front. A pulsator 20 may be disposed on the bottom surface of the inner tub 10. The inner tub 10 may be formed of a plastic material. The pulsator 20 may be connected to an output shaft 110 of a washing machine drive system 100. The washing machine drive system 100 is combined with the inner tub 10 to rotate the pulsator 20.

[0095] Figure 3 is a perspective view of a washing machine driving system according to an embodiment of the present specification. Figure 4 1 is an exploded perspective view of a washing machine driving system according to an embodiment of the present specification. Figure 5 is a cross-sectional perspective view of a washing machine driving system according to an embodiment of the present specification. Figure 6 1 is a cross-sectional perspective view of a clutch movable member, a clutch fixed member, and a portion of a rotor of a washing machine driving system according to an embodiment of the present specification. Figure 7 FIG. 1 is a diagram of a planetary gear set of a washing machine driving system according to an embodiment of the present specification, with an upper planet carrier removed.

[0096] Figure 8 is a cross-sectional view of a partial structure of a washing machine driving system according to an embodiment of the present specification. Fig. 9 FIG. 1 is an enlarged view of a clutch movable member and a clutch fixed member region in a cross section of a washing machine driving system according to an embodiment of the present specification.

[0097] Reference Figures 3 to 9 According to an embodiment of the present specification, a washing machine driving system 100 may include an output shaft 110, a cover 120, a first bearing 130, a second bearing 140, a motor fixing member 150, a rotor 160, a planetary gear set 170, and a clutch 180, but it may also be implemented by excluding some of these structures, and additional structures other than these structures are not excluded.

[0098] The output shaft 110 can extend in the axial direction. The output shaft 110 can be combined with the impeller 20. The output shaft 110 can be rotatably combined with the cover body 120. The output shaft 110 can be combined with the bearing of the cover body 120. The output shaft 110 can be combined with the planetary gear set 170. The output shaft 110 can be spline-connected to the planet carrier 179 of the planetary gear set 170. Here, spline refers to a groove or groove cut on a shaft or a bore, and a spline connection refers to a connection that can be disturbed in the axial direction and can rotate together. The output shaft 110 can rotate at the same speed as the planet carrier 179 of the planetary gear set 170. In one embodiment of the present specification, the axial direction can be interpreted as Figure 4 and Figure 5 The vertical direction of the reference.

[0099] The upper region of the output shaft 110 may be combined with the pulsator 20. The central region of the output shaft 110 may be bearing-coupled with the cover 120. A first bearing 130 and a second bearing 140 may be disposed between the central region of the output shaft 110 and the cover 120.

[0100] The lower region of the output shaft 110 may be disposed in the rotor 160. The lower region of the output shaft 110 may be coupled to the planetary gear set 170. The diameter of the lower region of the output shaft 110 may be formed to be smaller than the diameter of the central region. The axial length of the lower region of the output shaft 110 may be formed to be shorter than the axial length of the central region of the output shaft 110.

[0101] The output shaft 110 may include a first spline portion 112 formed on the outer circumferential surface. The first spline portion 112 may protrude outward from the outer circumferential surface of the output shaft 110. The first spline portion 112 may be disposed in a lower region of the output shaft 110. The first spline portion 112 may be spline-coupled to a second spline portion 1792 of the planetary carrier 179 of the planetary gear set 170.

[0102] The output shaft 110 is rotatably coupled to the cover 120. The upper portion of the cover 120 may be provided with a pulsator 20. The cover 120 may be coupled to the inner tub 10. The lower portion of the cover 120 may be provided with a motor fixture 150, a rotor 160, a planetary gear set 170, and a clutch 180. The cover 120 may be coupled to the motor fixture 150. The cover 120 may be formed of a plastic material.

[0103] The first bearing 130 may be disposed between the output shaft 110 and the cover 120. The first bearing 130 may bearing-couple the output shaft 110 to the cover 120. The first bearing 130 may rotatably couple the output shaft 110 to the cover 120. The first bearing 130 may extend in a circumferential direction. The first bearing 130 may be disposed above the second bearing 140.

[0104] The second bearing 140 may be disposed between the output shaft 110 and the cover 120. The second bearing 140 may be bearing-coupled between the output shaft 110 and the cover 120. The second bearing 140 may be rotatably coupled to the output shaft 110 to the cover 120. The second bearing 140 may extend in the circumferential direction. The second bearing 140 may be disposed below the first bearing 130. The second bearing 140 may be disposed above the planetary gear set 170. The second bearing 140 may be disposed above the planet carrier 179 of the planetary gear set 170. The second bearing 140 may be disposed radially inward of the motor fixing member 150. The second bearing 140 may be disposed radially inward of the clutch fixing members 182, 184, 185, 186.

[0105] The motor fixing member 150 may be combined with the cover 120. The motor fixing member 150 may be arranged on the inner side of the rotor 160. The motor fixing member 150 may face the rotor 160. The motor fixing member 150 may be arranged above the clutch 180. The motor fixing member 150 may be arranged above the clutch fixing members 182, 184, 185, 186. The clutch fixing members 182, 184, 185, 186 may be combined with the motor fixing member 150.

[0106] The motor fixing part 150 may include a motor coupling part 152. The motor coupling part 152 may be coupled to the cover body 120. The motor coupling part 152 may be arranged below the cover body 120. A fixing part coupling part 182 may be coupled to the motor coupling part 152. The motor coupling part 152 may be arranged above the fixing part coupling part 182. The motor coupling part 152 may extend in the circumferential direction. The outer peripheral surface of the motor coupling part 152 may be arranged with a motor stator 154.

[0107] The motor fixture 150 may include a motor stator 154. The motor stator 154 may be configured on the radially outer side of the motor coupling portion 152. The motor stator 154 may be coupled to the motor coupling portion 152. The motor stator 154 may be configured on the radially inner side of the rotor 160. The motor stator 154 may face the rotor magnet 162. The motor stator 154 may include a plurality of motor stator units spaced apart in the circumferential direction. The motor stator unit may include a motor stator core formed on the outer peripheral surface of the motor coupling portion 152, a motor coil wound on the motor stator core, and a yoke portion coupled to the motor stator core. The motor stator 154 may rotate the rotor magnet 162 through electromagnetic interaction.

[0108] The rotor 160 may face the motor fixture 150. The rotor 160 may be coupled with the planetary gear set 170. The rotor 160 may be coupled with the sun gear 172 of the planetary gear set 170. Thus, the rotor 160 may provide a rotational force to the output shaft 110.

[0109] The rotor 160 may include a rotor magnet 162. The rotor magnet 162 may be disposed on a rotor housing 164. The rotor magnet 162 may be disposed on an inner circumferential surface of a cylindrical portion 1642 of the rotor housing 164. The rotor magnet 162 may face the motor mount 150. The rotor magnet 162 may face the motor stator 154 of the motor mount 150. When current is supplied to the motor stator 154 of the motor mount 150, the rotor magnet 162 may rotate in one direction or the other direction by electromagnetic interaction.

[0110] The rotor magnet 162 may overlap the second coil 1864 and the third coil 1862 in a direction perpendicular to or horizontal to the output shaft 110. The rotor magnet 162 may not overlap the first coil 1866 in a direction perpendicular to or horizontal to the output shaft 110. Thus, the space efficiency of the rotor 160 and the motor fixture 150 may be improved.

[0111] The rotor magnet 162 may include a plurality of rotor magnet units spaced apart in the circumferential direction, and the plurality of rotor magnet units may face the plurality of motor stator units, respectively.

[0112] The rotor 160 may include a rotor housing 164. The rotor housing 164 may include a disk portion 1644 sharing a center with the output shaft 110, and a cylindrical portion 1642 extending upward from the radially outer side of the disk portion 1644. The inner circumferential surface of the cylindrical portion 1642 may be configured with a rotor magnet 162. The disk portion 1644 may be combined with the planetary gear set 170. The disk portion 1644 may be combined with the sun gear 172 of the planetary gear set 170. A fourth clutch portion 1646 may be formed on the disk portion 1644. The fourth clutch portion 1646 may be formed on the top surface of the disk portion 1644. The fourth clutch portion 1646 may face the third clutch portion 1888 of the clutch movable members 188 and 189. The fourth clutch portion 1646 may mesh with the third clutch portion 1888 of the clutch movable members 188 and 189. The fourth clutch portion 1646 may extend in the circumferential direction. The fourth clutch portion 1646 may be formed of a plurality of protrusions spaced apart from each other in the circumferential direction.

[0113] The motor fixture 150 and the rotor 160 may be referred to as a “motor”.

[0114] The planetary gear set 170 may be spline-coupled to the outer circumferential surface of the output shaft 110. The planetary gear set 170 may be combined with the rotor 160. The planetary gear set 170 may rotate integrally with the rotor 160. The planetary gear set 170 may transmit the rotational force of the rotor 160 to the output shaft 110.

[0115] Specifically, as the clutch movable members 188 and 189 move in the vertical direction, the planetary gear set 170 can transmit the rotational force of the rotor 160 to the output shaft 110 at a gear ratio of 1:1 or n:1. For example, when the clutch movable members 188 and 189 move upward and are fixed to the clutch fixed members 182, 184, 185, and 186, a part of the structure of the planetary gear set 170 spline-connected with the clutch movable members 188 and 189 is fixed, so the rotational force of the rotor 160 can be transmitted at a gear ratio of n:1 of the output shaft 110. On the contrary, when the clutch movable members 188 and 189 move downward and are fixed to the rotor 160, the clutch movable members 188 and 189 and the planetary gear set 170 rotate together with the rotor 160 as a whole, so the rotational force of the rotor 160 can be transmitted to the output shaft 110 at a gear ratio of 1:1. As a result, the washing mode and the dehydration mode can be realized without stopping between the end of washing and the start of dehydration.

[0116] The planetary gear set 170 may include a sun gear 172 , a plurality of pinion gears 174 , a ring gear 176 , a connecting portion 178 , and a planet carrier 179 .

[0117] The sun gear 172 may be coupled to the rotor 160. The sun gear 172 may be coupled to the rotor housing 164 of the rotor 160. The lower region of the sun gear 172 may be coupled to the radially inner region of the rotor housing 164. The sun gear 172 may be coupled to a plurality of pinion gears 174. The upper region of the sun gear 172 may be coupled to a plurality of pinion gears 174. The outer peripheral surface of the sun gear 172 may be coupled to a plurality of pinion gears 174. The sun gear 172 may be coupled to the planet carrier 179 bearing via a sun gear bearing 173. A first gear 1722 may be formed on the outer peripheral surface of the sun gear 172. Although in one embodiment of the present specification, the case where the first gear 1722 is a spur gear is used as an example for explanation, differently from this, the first gear 1722 may also be changed to a helical gear.

[0118] The plurality of pinion gears 174 may be spaced apart from each other in the circumferential direction. The outer circumferential surfaces of the plurality of pinion gears 174 may be respectively coupled to the outer circumferential surface of the sun gear 172. The outer circumferential surfaces of the plurality of pinion gears 174 may be formed with a second gear 1742. Although in one embodiment of the present specification, the second gear 1742 is described as a spur gear as an example, the second gear 1742 may be changed to a helical gear.

[0119] Although the example in the present specification is that the number of the plurality of pinion gears 174 is three, the present invention is not limited thereto, and the number of the plurality of pinion gears 174 may be changed in various ways.

[0120] A connection portion 178 may be formed inside each of the plurality of pinion gears 174 . The plurality of pinion gears 174 may be connected to the planet carrier 179 via the connection portion 178 .

[0121] The inner circumference of the ring gear 176 may be coupled to a plurality of pinions 174. The inner circumference of the ring gear 176 may be formed with a third gear 1762. Although the third gear 1762 is a spur gear as an example in one embodiment of the present specification, the third gear 1762 may be a helical gear.

[0122] The outer peripheral surface of the ring gear 176 may be spline-coupled to the clutch movable members 188 and 189. The outer peripheral surface of the ring gear 176 may be formed with a third spline portion 1764. The third spline portion 1764 of the ring gear 176 may be spline-coupled to the fourth spline portion 1884 of the clutch movable members 188 and 189.

[0123] The planet carrier 179 may be coupled to the plurality of pinion gears 174. The planet carrier 179 may be coupled to the plurality of pinion gears 174 via a connection portion 178. The planet carrier 179 may be disposed above the plurality of pinion gears 174.

[0124] The planet carrier 179 may be spline-coupled to the outer circumference of the output shaft 110 . A second spline portion 1792 may be formed on the inner circumference of the planet carrier 179 . The second spline portion 1792 may be spline-coupled to the first spline portion 112 of the output shaft 110 .

[0125] The planet carrier 179 can be coupled to the sun gear 172 through the sun gear bearing 173. The planet carrier 179 can be coupled to the ring gear 176 through the ring gear bearing 177. Thus, the rotation speed of the planet carrier 179 can be different from the rotation speed of the ring gear 176, and the rotation speed of the planet carrier 179 can be different from the rotation speed of the sun gear 172, and the rotational force of the rotor 160 can be reduced at a gear ratio of n:1 and transmitted to the output shaft 110.

[0126] The ring gear bearing 177 may include a first ring gear bearing 1772 and a second ring gear bearing 1774 spaced apart in a vertical direction. The first ring gear bearing 1772 may be disposed above the plurality of pinion gears 174 , and the second ring gear bearing 1774 may be disposed below the plurality of pinion gears 174 .

[0127] The sun gear bearing 173 may overlap the first coil 1866 and the second coil 1864 in a direction perpendicular to the output shaft 110 or in a horizontal direction. The sun gear bearing 173 may include a first sun gear bearing 1732 and a second sun gear bearing 1734 spaced apart in a vertical direction. The vertical center area of ​​the plurality of pinions 174 is arranged between the first coil 1866 and the second coil 1864 in a direction perpendicular to the output shaft 110 or in a horizontal direction. The plurality of pinions 174 may overlap the first coil 1866 and the second coil 1864 in a direction perpendicular to the output shaft 110 or in a horizontal direction. The plurality of pinions 174 may not overlap the third coil 1862 in a direction perpendicular to the output shaft 110 or in a horizontal direction. The top surface of the ring gear 176 may overlap the third coil 1862 in a direction perpendicular to the output shaft 110 or in a horizontal direction. The bottom surface of the ring gear 176 may be arranged below the first coil 1866 in a direction perpendicular to the output shaft 110 or in a horizontal direction. Thus, the size of the washing machine driving system 100 can be reduced.

[0128] The clutch 180 may be disposed between the motors 150, 160 and the planetary gear set 170. A portion of the clutch 180 may be spline-connected to the planetary gear set 170, and another portion may be coupled to the motor mount 150. The clutch 180 may fix or release a portion of the structure of the planetary gear set 170. Thus, the clutch 180 may enable the planetary gear set 170 to transmit the rotational force of the rotor 160 to the output shaft 110 at a 1:1 ratio, or reduce the speed at a gear ratio of n:1 and transmit it to the output shaft 110. The clutch 180 may include clutch mounts 182, 184, 185, 186 and clutch movables 188, 189.

[0129] The clutch fixing members 182, 184, 185, 186 may be combined with the motor fixing member 150. The clutch fixing members 182, 184, 185, 186 may be combined with the motor combining portion 152. The clutch fixing members 182, 184, 185, 186 may be combined with the bottom surface of the motor combining portion 152. The clutch fixing members 182, 184, 185, 186 are arranged between the planetary gear set 170 and the motor fixing member 150 in a direction perpendicular to the output shaft 110 or in a horizontal direction. The clutch fixing members 182, 184, 185, 186 may include a fixing member combining portion 182, a clutch stator 184, an insulator 185, and a coil 186.

[0130] The fixing member combination part 182 can be combined with the bottom surface of the motor combination part 152. The fixing member combination part 182 can be combined with a clutch stator 184, an insulator 185, and a coil 186. The fixing member combination part 182 can be formed of a plastic material. The fixing member combination part 182 can include a circumferential part 1822 extending circumferentially inwardly on the top surface, and a second clutch part 1824 formed on the bottom surface of the circumferential part 1822.

[0131] The circumferential portion 1822 may extend in the circumferential direction. The circumferential portion 1822 may extend upward on the top surface and the inner circumferential surface of the fixed member coupling portion 182 and extend radially inward. The bottom surface of the circumferential portion 1822 may face the clutch movable members 188 and 189 .

[0132] The second clutch portion 1824 may overlap with the clutch movable members 188, 189 in the vertical direction. The second clutch portion 1824 may face the first clutch portion 1886 of the clutch movable members 188, 189. The second clutch portion 1824 may mesh with the first clutch portion 1886 of the clutch movable members 188, 189. The second clutch portion 1824 may be formed of a plurality of protrusions spaced apart from each other in the circumferential direction.

[0133] The clutch stator 184 may be combined with the fixing member coupling portion 182. The clutch stator 184 may be formed of a metal material. An insulator 185 and a coil 186 may be configured in the clutch stator 184. The clutch stator 184 may include a first core 1846, a second core 1844, and a third core 1842 arranged side by side in a vertical direction. The first core 1846, the second core 1844, and the third core 1842 may be formed in the same shape. The first core 1846 may be configured with a first insulator 1856 and a first coil 1866, the second core 1844 may be configured with a second insulator 1854 and a second coil 1864, and the third core 1842 may be configured with a third insulator 1852 and a third coil 1862.

[0134] The insulator 185 may be disposed on the clutch stator 184. The insulator 185 may include a first insulator 1856, a second insulator 1854, and a third insulator 1852 disposed side by side in a vertical direction. The first insulator 1856 may be disposed on the first core 1846, the second insulator 1854 may be disposed on the second core 1844, and the third insulator 1852 may be disposed on the third core 1842.

[0135] The coil 186 may be arranged on the clutch stator 184. The coil 186 may be arranged on the radial inner side of the insulator 185. The coil 186 may include a first coil 1866, a second coil 1864, and a third coil 1862. The first coil 1866, the second coil 1864, and the third coil 1862 may be arranged side by side in the vertical direction. The first coil 1866, the second coil 1864, and the third coil 1862 may be spaced at equal intervals in the vertical direction. The first coil 1866 may be arranged on the first core 1846. The second coil 1864 may be arranged on the second core 1844. The third coil 1862 may be arranged on the third core 1842. The first coil 1866, the second coil 1864, and the third coil 1862 are respectively formed in the same shape.

[0136] When current is supplied to the first coil 1866, the clutch movable members 188 and 189 may move downward. In this case, the third clutch portion 1888 of the clutch movable members 188 and 189 may be engaged with the fourth clutch portion 1646 of the rotor 160 and the clutch movable members 188 and 189 may be fixed to the rotor 160. Since the planetary gear set 170 spline-connected to the clutch movable members 188 and 189 rotates integrally with the rotor 160, the rotational force of the rotor 160 is transmitted to the output shaft 110 at a 1:1 ratio, thereby realizing the dehydration mode.

[0137] When current is supplied to the third coil 1862, the clutch movable members 188 and 189 may move upward. In this case, the first clutch portion 1886 of the clutch movable members 188 and 189 meshes with the second clutch portion 1824 of the clutch fixed members 182, 184, 185, 186 and the clutch movable members 188 and 189 are fixed to the clutch fixed members 182, 184, 185, 186. Since the ring gear 176 of the planetary gear set 170 spline-connected to the clutch movable members 188 and 189 is fixed, the rotational force of the rotor 160 is decelerated at a gear ratio of n:1 and transmitted to the output shaft 110, thereby realizing the washing mode.

[0138] When current is supplied to the second coil 1864, the coupling between the clutch movable members 188 and 189 and the rotor 160 or the clutch fixed members 182, 184, 185, and 186 is released. Thus, the neutral mode of the clutch 180 is realized, so the reduction ratio can be applied while the rotation of the rotor 160 is maintained. In addition, the dehydration initial mode is entered by applying the reduction ratio without stopping the rotation of the rotor 160, so that high torque can be generated.

[0139] The clutch movable members 188 and 189 may be spline-connected to the outer circumference of the planetary gear set 170. Thus, the clutch movable members 188 and 189 may move in the vertical direction in the state of being coupled to the planetary gear set 170. The clutch movable members 188 and 189 may face the clutch fixed members 182, 184, 185, and 186. The clutch movable members 188 and 189 may be arranged between the planetary gear set 170 and the motor fixed member 150 in the direction perpendicular to the output shaft 110 or in the horizontal direction. The clutch movable members 188 and 189 may include a clutch coupling portion 1882, a first clutch portion 1886, a third clutch portion 1888, a fourth spline portion 1884, and a clutch magnet 189.

[0140] The clutch engaging portion 1882 may extend in the circumferential direction. The cross section of the clutch engaging portion 1882 may be formed as The clutch engaging portion 1882 may be spline-coupled to the planetary gear set 170. The clutch engaging portion 1882 may be spline-coupled to the ring gear 176 of the planetary gear set 170. The clutch engaging portion 1882 may face the clutch fixing members 182, 184, 185, 186. The top surface of the clutch engaging portion 1882 may face the second clutch portion 1824. The bottom surface of the clutch engaging portion 1882 may face the fourth clutch portion 1646.

[0141] The first clutch portion 1886 may be formed on the top surface of the clutch movable members 188 and 189. The first clutch portion 1886 may be formed on the top surface of the clutch coupling portion 1882. The first clutch portion 1886 may be formed as a plurality of convex shapes spaced apart in the circumferential direction. The first clutch portion 1886 may face the second clutch portion 1824. The first clutch portion 1886 may be engaged with the second clutch portion 1824. Specifically, when current is supplied to the third coil 1862 and the clutch movable members 188 and 189 move upward, the first clutch portion 1886 is engaged with the second clutch portion 1824 and the clutch movable members 188 and 189 may be fixed to the clutch fixed members 182, 184, 185, 186. As a result, the clutch movable elements 188 and 189 are coupled to the clutch stators 182 , 184 , 185 , and 186 , and the rotation of the ring gear 176 spline-coupled to the clutch movable elements 188 and 189 can be stopped.

[0142] The third clutch portion 1888 may be formed on the bottom surface of the clutch movable members 188 and 189. The third clutch portion 1888 may be formed on the bottom surface of the clutch coupling portion 1882. The third clutch portion 188 may be formed as a plurality of convex shapes spaced apart in the circumferential direction. The third clutch portion 1888 may face the fourth clutch portion 1646. The third clutch portion 1888 may be engaged with the fourth clutch portion 1646. Specifically, when current is supplied to the first coil 1866 and the clutch movable members 188 and 189 move downward, the third clutch portion 1888 is engaged with the fourth clutch portion 1646 and the clutch movable members 188 and 189 may be fixed to the rotor 160. Thus, the ring gear 176 spline-connected to the clutch movable members 188 and 189 can be rotated together with the rotor 160.

[0143] The fourth spline portion 1884 may be formed on the inner circumferential surface of the clutch coupling portion 1882. The fourth spline portion 1884 may be spline-coupled to the planetary gear set 170. The fourth spline portion 1884 may be spline-coupled to the third spline portion 1764 of the ring gear 176.

[0144] The clutch magnet 189 may be arranged at the clutch coupling portion 1882. The clutch magnet 189 may be arranged at a groove formed at the outer peripheral surface of the clutch coupling portion 1882. The clutch magnet 189 may extend in the circumferential direction. The clutch magnet 189 may face the clutch fixing members 182, 184, 185, 186. The clutch magnet 189 may face the first coil 1866, the second coil 1864, and the third coil 1862. The clutch magnet 189 may move in a vertical direction according to electromagnetic interaction with the first coil 1866, the second coil 1864, and the third coil 1862. The clutch magnet 189 may include a plurality of magnetic poles arranged in a vertical direction. The vertical length of the clutch magnet 189 may be between 1.5 and 2.5 times the vertical length of each of the first coil 1866, the second coil 1864, and the third coil 1862. Preferably, the vertical length of the clutch magnet 189 is between 1.8 and 2.2 times the vertical length of each of the first coil 1866, the second coil 1864, and the third coil 1862. More preferably, the vertical length of the clutch magnet 189 is twice the vertical length of each of the first coil 1866, the second coil 1864, and the third coil 1862. In this way, the efficiency of the clutch 180 can be improved while the positions of the three stable points are stably determined. Here, it can be understood that Figure 5 , Figure 6 , Figures 8 to 12 As a reference, the vertical length of the clutch magnet 189 refers to the length in the up-down direction.

[0145] When current is supplied to the first coil 1866, the clutch magnet 189 may overlap with the first coil 1866, the second coil 1864, the first core 1846, and the second core 1844 in the horizontal direction. When current is supplied to the first coil 1866, the vertical center area of ​​the clutch magnet 189 may overlap with the upper end area of ​​the first coil 1866 in the horizontal direction. Here, the upper end area of ​​the first coil 1866 may be interpreted as the area adjacent to the upper end or top surface in the first coil 1866. In this specification, overlapping in the horizontal direction may be understood as overlapping in the horizontal direction. Figure 5 , Figure 6 , Figures 8 to 12 Overlap in the left and right directions.

[0146] When current is supplied to the second coil 1864, the clutch magnet 189 overlaps the second coil 1864 and the first core 1846, the second core 1844, and the third core 1842 in the horizontal direction. When current is supplied to the second coil 1864, the vertical center area of ​​the clutch magnet 189 overlaps the vertical center area of ​​the second coil 1864 in the horizontal direction.

[0147] When current is supplied to the third coil 1862, the clutch magnet 189 overlaps the second coil 1864, the third coil 1862, the second core 1844, and the third core 1842 in the horizontal direction. When current is supplied to the third coil 1862, the vertical center area of ​​the clutch magnet 189 overlaps the lower end area of ​​the third coil 1862 in the horizontal direction. Here, the lower end area of ​​the third coil 1862 can be interpreted as an area adjacent to the lower end or bottom surface in the third coil 1862.

[0148] Thus, three stable points are formed, and even when the supply of current to the first coil 1866, the second coil 1864, and the third coil 1862 is stopped, the positions of the clutch movable members 188 and 189 can be maintained. Here, the three stable points can be understood as Figures 13 to 15 The center area of ​​the reference clutch magnet 189 is located at the -k, 0, k position.

[0149] Specifically, when the current is supplied to the first coil 1866 and then the current supply is stopped, the clutch movable parts 188 and 189 can be kept connected to the rotor 160. When the current is supplied to the third coil 1862 and then the current supply is stopped, the clutch movable parts 188 and 189 can be kept connected to the clutch fixed parts 182, 184, 185, and 186. When the current is supplied to the second coil 1864 and then the current supply is stopped, the clutch movable parts 188 and 189 can be kept disconnected from the rotor 160 or the clutch fixed parts 182, 184, 185, and 186.

[0150] Thus, even if the supply of current is stopped after the clutch movable members 188 and 189 move in the vertical direction, the positions of the clutch movable members 188 and 189 can be maintained, so that power consumption can be reduced.

[0151] Figures 10 to 12 1 is an operation diagram of a clutch movable part in a washing machine driving system according to an embodiment of the present specification.

[0152] Reference Fig.10 When current is supplied to the first coil 1866, the clutch movable members 188 and 189 move downward according to the electromagnetic interaction between the first coil 1866 and the clutch magnet 189. In this case, the third clutch portion 1888 of the clutch movable members 188 and 189 meshes with the fourth clutch portion 1646 of the rotor 160. Since the ring gear 174 spline-connected to the clutch movable members 188 and 189 rotates together with the rotor 160, the clutch 180 transmits the rotational force of the rotor 160 to the output shaft 110 at a 1:1 ratio to achieve the dehydration mode.

[0153] Reference Fig.11 When current is supplied to the second coil 1864, the clutch movable members 188 and 189 move to the area adjacent to the second coil 1864 through the electromagnetic interaction between the second coil 1864 and the clutch magnet 189. In this case, the clutch movable members 188 and 189 are released from the rotor 160 and the clutch fixing members 182, 184, 185, and 186, and the neutral mode is realized, so that the washing mode can be switched to the dehydration mode or the dehydration mode can be switched to the washing mode even when the rotor 160 is rotating.

[0154] Reference Fig.12 When current is supplied to the third coil 1862, the clutch movable members 188 and 189 move upward by electromagnetic interaction between the third coil 1862 and the clutch magnet 189. In this case, the first clutch portion 1886 of the clutch movable members 188 and 189 meshes with the second clutch portion 1824 of the clutch fixed members 182, 184, 185, and 186. Since the ring gear 174 spline-connected to the clutch movable members 188 and 189 is fixed, the planetary gear set 170 reduces the rotational force of the rotor 160 at a gear ratio of n:1 and transmits it to the output shaft 110 to realize the washing mode.

[0155] Fig.13 1 is a graph showing the z-axis force of the position of the movable member of the clutch of the washing machine driving system according to one embodiment of the present specification. Figures 14 to 16 1 is a diagram showing the magnetic flux density distribution of the clutch stator at the position of the clutch movable member of the washing machine driving system according to one embodiment of the present specification.

[0156] Reference Fig.13 and Fig.14 It can be known that when the vertical center area of ​​the clutch magnet 189 is configured at the -k position, the z-axis force applied to the clutch magnet 189 by the magnetic flux density of the first core 1846, the second core 1844, the third core 1842 and the clutch magnet 189 is 0.

[0157] Reference Fig.13 and Fig.15 It can be known that when the vertical center area of ​​the clutch magnet 189 is configured at position 0, the z-axis force applied to the clutch magnet 189 by the magnetic flux density of the first core 1846, the second core 1844, the third core 1842 and the clutch magnet 189 is 0.

[0158] Reference Fig.13 and Fig.16It can be known that when the vertical center area of ​​the clutch magnet 189 is configured at the +k position, the z-axis force applied to the clutch magnet 189 by the magnetic flux density of the first core 1846, the second core 1844, the third core 1842 and the clutch magnet 189 is 0.

[0159] Fig.17 and Fig.18 is a graph showing the z-axis force applied to the clutch magnet in the position of the clutch magnet of the washing machine driving system according to one embodiment of the present specification.

[0160] Reference Fig.14 and Fig.17 , when switching from mode 1 to mode 2, the second coil 1864 is supplied with current. Specifically, when current is supplied to the second coil 1864 in the dehydration mode where the clutch magnet 189 is located on the left side in the z-axis direction (the lower side in the vertical direction), a force to the right side in the z-axis direction is applied to the clutch magnet 189. In this case, since the position of the clutch magnet 189 moves toward the center of the z-axis direction (the center in the vertical direction), the neutral mode can be achieved. In particular, when the position of the central area in the z-axis direction (the central area in the vertical direction) of the clutch magnet 189 is at position 0, the z-axis force applied to the clutch magnet 189 becomes 0, so it does not immediately switch to the washing mode but can be located at a stable point.

[0161] Reference Fig.15 and Fig.17 When switching from mode 2 to mode 1, current is supplied to the first coil 1866. Specifically, when current is supplied to the first coil 1866 in the neutral mode where the clutch magnet 189 is located in the center of the z-axis direction (the center of the vertical direction), a force to the left of the z-axis direction is applied to the clutch magnet 189. In this case, since the position of the clutch magnet 189 moves to the left of the z-axis direction (vertically downward), the dehydration mode can be achieved.

[0162] Reference Fig.15 and Fig.18 , when switching from mode 2 to mode 3, current is supplied to the third coil 1862. Specifically, when current is supplied to the third coil 1862 in the neutral mode where the clutch magnet 189 is located in the center of the z-axis direction (the center of the vertical direction), a force to the right of the z-axis direction is applied to the clutch magnet 189. In this case, since the position of the clutch magnet 189 moves to the right of the z-axis direction (the upper part of the vertical direction), the washing mode can be realized.

[0163] Reference Fig.16 and Fig.18, when switching from mode 3 to mode 2, current is supplied to the second coil 1864. Specifically, when current is supplied to the second coil 1864 in the washing mode where the clutch magnet 189 is located on the right side in the z-axis direction (above in the vertical direction), a force toward the left side in the z-axis direction is applied to the clutch magnet 189. In this case, since the position of the clutch magnet 189 moves to the left side in the z-axis direction (below in the vertical direction), the neutral mode can be achieved. In particular, when the position of the central area in the z-axis direction (central area in the vertical direction) of the clutch magnet 189 is at position 0, the z-axis force applied to the clutch magnet 189 becomes 0, so it will not be immediately switched to the dehydration mode but can be located at a stable point.

[0164] That is, three stable points can be formed by the size and configuration of the specific structure of the clutch 180 according to an embodiment of the present specification, thereby maintaining the position of the clutch movable parts 188 and 189 even when the supply of current to the first coil 1866, the second coil 1864, and the third coil 1862 is terminated.

[0165] Certain embodiments or other embodiments of the present specification described herein are not exclusive or mutually distinct. The individual structures or functions of any certain embodiments or other embodiments of the present specification described herein may be used or combined.

[0166] For example, the structure A described in a specific embodiment and / or the drawings can be combined with the structure B described in other embodiments and / or the drawings. That is, even if the combination between the structures is not directly described, it means that they can be combined unless the case where they cannot be combined is described.

[0167] The above detailed description should not be interpreted as limiting in any aspect, but should be regarded as exemplary. The scope of this specification should be determined by reasonable interpretation of the attached claims, and all changes within the equivalent scope of this specification are included in the scope of this specification.

Claims

1. A washing machine driving system, comprising: Cover body; a motor fixing member, which is combined with the cover; a rotor facing the motor fixture; an output shaft, which is combined with the cover bearing; A planetary gear set combined with the rotor and spline-connected to the outer peripheral surface of the output shaft; a clutch fixing member combined with the motor fixing member; and a clutch movable member, which is spline-connected to the outer peripheral surface of the planetary gear set in a manner movable in a vertical direction and faces the clutch fixed member; The clutch fixing member includes a first coil, a second coil and a third coil arranged side by side in a vertical direction; When the first coil is supplied with current, the clutch movable element is fixed to the rotor and transmits the rotational force of the rotor to the output shaft at a ratio of 1:1; When the third coil is supplied with current, the clutch movable member is fixed to the clutch fixed member to reduce the rotational force of the rotor at a gear ratio of n:1 and transmit it to the output shaft; When the second coil is supplied with current, the clutch movable element is released from the rotor or the clutch fixed element.

2. The washing machine driving system according to claim 1, wherein: The planetary gear set comprises: a sun gear coupled to the rotor; A plurality of pinion gears coupled to the outer peripheral surface of the sun gear and spaced apart in the circumferential direction; a ring gear, the inner peripheral surface of which is coupled to the plurality of pinion gears, and the outer peripheral surface of which is spline-connected to the clutch movable member; and A planet carrier is combined with the plurality of pinion gears and is spline-connected to the outer circumferential surface of the output shaft.

3. The washing machine driving system according to claim 2, wherein: Also included is a sun gear bearing disposed between the planet carrier and the sun gear.

4. The washing machine driving system according to claim 3, wherein: The sun gear bearing overlaps the first coil and the second coil in a direction perpendicular to the output shaft.

5. The driving system of the washing machine according to claim 2, wherein: Also included is a ring gear bearing, which is arranged between the planet carrier and the ring gear.

6. The driving system of the washing machine according to claim 2, wherein: A vertical center area of ​​the plurality of pinion gears is arranged between the first coil and the second coil in a direction perpendicular to the output shaft.

7. The driving system of the washing machine according to claim 2, wherein: The plurality of pinions overlap with the first coil and the second coil in a direction perpendicular to the output shaft, and do not overlap with the third coil in a direction perpendicular to the output shaft.

8. The driving system of the washing machine according to claim 2, wherein: The top surface of the gear ring overlaps with the third coil in a direction perpendicular to the output shaft; The bottom surface of the ring gear is arranged below the first coil in a direction perpendicular to the output shaft.

9. The washing machine driving system according to claim 1, wherein: The clutch movable member includes a first clutch portion formed on a top surface thereof; The clutch fixing member includes a second clutch portion formed on a surface facing the top surface of the clutch movable member; When current is supplied to the third coil, the first clutch component and the second clutch component mesh with each other.

10. The driving system of the washing machine according to claim 1, wherein: The clutch movable member includes a third clutch portion formed on a bottom surface thereof; The rotor includes a fourth clutch portion formed on a surface facing a bottom surface of the clutch movable member; When current is supplied to the first coil, the third clutch component and the fourth clutch component mesh with each other.

11. The driving system of the washing machine according to claim 1, wherein: The clutch movable member includes a clutch engaging portion and a clutch magnet, the clutch engaging portion is spline-connected with the planetary gear set, and the clutch magnet is arranged on the clutch engaging portion and faces the clutch fixed member; When the first coil is supplied with current and then the supply of current is stopped, the clutch movable element is kept engaged with the rotor; When the current supply to the third coil is stopped after the current is supplied to the third coil, the clutch movable member is kept engaged with the clutch fixed member; When the current is supplied to the second coil and then the supply of the current is stopped, the clutch movable element and the rotor or the clutch fixed element are kept released from the connection.

12. The washing machine driving system according to claim 11, wherein: The vertical length of the clutch magnet is 1.8 to 2.2 times the vertical length of each of the first coil, the second coil, and the third coil.

13. The driving system of the washing machine according to claim 1, wherein: The clutch fixing member includes a fixing member coupling portion, a first core, a second core, and a third core, wherein the fixing member coupling portion is coupled to the motor fixing member, and the first core, the second core, and the third core are disposed on the fixing member coupling portion and arranged side by side in a vertical direction; The first coil is arranged on the first core, the second coil is arranged on the second core, and the third coil is arranged on the third core; The first core, the second core, and the third core are formed in the same shape, and the first coil, the second coil, and the third coil are formed in the same shape.

14. The washing machine driving system according to claim 13, wherein: The fixing member coupling portion includes a circumferential portion extending circumferentially inwardly on the top surface; A second clutch portion is disposed on the bottom surface of the circumferential portion; The second clutch portion overlaps the clutch movable element in a vertical direction.

15. The driving system of the washing machine according to claim 13, wherein: The clutch movable member includes a clutch engaging portion and a clutch magnet, the clutch engaging portion is spline-connected with the planetary gear set, and the clutch magnet is arranged on the clutch engaging portion and faces the clutch fixed member; When the first coil is supplied with current, the clutch magnet overlaps the first coil, the second coil, the first core, and the second core in a horizontal direction; When the second coil is supplied with current, the clutch magnet overlaps the second coil, the first core, the second core, and the third core in the horizontal direction; When the third coil is supplied with current, the clutch magnet overlaps the second coil, the third coil, the second core, and the third core in a horizontal direction.

16. The driving system of the washing machine according to claim 13, wherein: The clutch movable member includes a clutch engaging portion and a clutch magnet, the clutch engaging portion is spline-connected with the planetary gear set, and the clutch magnet is arranged on the clutch engaging portion and faces the clutch fixed member; When the first coil is supplied with current, the vertical center area of ​​the clutch magnet overlaps with the upper end area of ​​the first coil in the horizontal direction; When the second coil is supplied with current, the vertical center area of ​​the clutch magnet overlaps with the vertical center area of ​​the second coil in the horizontal direction; When the third coil is supplied with current, a vertical center region of the clutch magnet overlaps with a lower end region of the third coil in a horizontal direction.

17. The driving system of the washing machine according to claim 1, wherein: The clutch movable element and the clutch fixed element are arranged between the planetary gear set and the motor fixed element in a direction perpendicular to the output shaft.

18. The driving system of the washing machine according to claim 1, wherein: The rotor includes a rotor housing and a rotor magnet, the rotor housing includes a disc portion and a cylindrical portion, the disc portion shares a center with the output shaft, the cylindrical portion extends upwardly outside the radial direction of the disc portion, and the rotor magnet is arranged on the cylindrical portion and faces the motor fixing member; The rotor magnet overlaps the second coil and the third coil in a direction perpendicular to the output shaft, and does not overlap the first coil in a direction perpendicular to the output shaft.

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