JP7535684B2 - washing machine - Google Patents

Description

This disclosure relates to a washing machine.

Patent document 1 discloses a washing machine that suppresses vibration of the entire water tub.

In the washing machine of Patent Document 1, a rotating drum 101 that holds and rotates laundry is rotatably disposed in a water tub 102, and a motor 21 that drives the rotating drum 101 to rotate is provided at the bottom of the water tub 102.

A lid 30 is provided at the opening of the rotating drum 101 so that it can be opened and closed freely. The water tub 102 is held in position by a suspension 111 provided between it and the housing 23, and dampers 25, 26, and 27 provided at the bottom suppress vibration of the water tub unit 109 during spin-drying.

JP 2015-43801 A

This disclosure provides a washing machine that can effectively suppress both vibration and resonance phenomena in the water tub unit.

The washing machine of the present disclosure comprises a housing, a water tub formed into a cylindrical shape with a bottom, a rotating drum rotatably arranged within the water tub, a rotating shaft fixed to the bottom of the rotating drum, a motor that rotates and drives the rotating drum via the rotating shaft, a water tub unit including the water tub, rotating drum, rotating shaft and motor, a suspension that elastically connects an upper part of the housing to the water tub unit, and a plurality of dampers that connect a lower part of the housing to a lower part of the water tub and damp vibrations of the water tub unit. The dampers include a first damper arranged to face each other across the center of gravity of the aquarium unit when viewed from above , and a second damper arranged approximately vertically to face each other across the center of gravity of the aquarium unit , generating a damping force when an amplitude equal to or greater than a predetermined value occurs , and not generating the damping force when the amplitude is smaller than the predetermined value, and two of the first dampers and two of the second dampers are provided, and the angle α between the second damper and the vertical direction is smaller than the angle β between the first damper and the vertical direction .

The washing machine disclosed herein can effectively suppress both vibration and resonance phenomena in the water tub unit.

FIG. 1 is a cross-sectional view of a washing machine according to a first embodiment of the present invention; FIG. 1 is a cross-sectional view showing a damper in a top view of the washing machine according to the first embodiment; FIG. 1 is a cross-sectional view showing a damper in a front view of a washing machine according to a first embodiment; FIG. 1 is a schematic diagram showing the arrangement of four dampers of a washing machine according to a first embodiment; FIG. 13 is a schematic diagram showing the arrangement of four dampers of a washing machine according to a second embodiment. FIG. 13 is a schematic diagram showing the arrangement of four dampers of a washing machine according to a third embodiment. FIG. 13 is a schematic diagram showing the arrangement of four dampers of a washing machine according to a fourth embodiment.

Below, the embodiments will be described in detail with reference to the drawings. However, more detailed explanations than necessary may be omitted. For example, detailed explanations of matters that are already well known, or duplicate explanations of substantially identical configurations may be omitted. This is to avoid making the following explanation unnecessarily redundant and to make it easier for those skilled in the art to understand.

The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 4. FIG.

(1-1. Configuration)
(1-1-1. Basic configuration of washing machine)
1, the water tank 102 is formed in a cylindrical shape with a bottom and is configured to be able to store water therein. A water supply path (not shown) for supplying tap water and a drainage path 117 for draining water from inside the water tank 102 are connected to the water tank 102. Water is supplied to the water tank 102 via the water supply path when a water supply valve (not shown) is open, and water is drained via the drainage path 117 when a drainage valve (not shown) is open.

The rotating drum 101 is formed in a cylindrical shape with a bottom, and is disposed inside the water tub 102. The inner wall surface of the rotating drum 101 is provided with several protruding plates (not shown) for agitating the clothes, and water holes (not shown) that allow water to flow between the inside and outside.

A bearing case 103 having a bearing 104 supporting a rotating shaft 105 is provided at the bottom on the rear side of the water tub 102. The rotating shaft 105 is provided at the center of rotation of the rotating drum 101, and the axial direction is inclined downward from the front side to the rear side. A drum pulley 106 is provided at the bottom on the rear side of the water tub 102 of the rotating shaft 105, and a drum drive motor 108 is provided at the bottom of the water tub 102. The drum drive motor 108 is connected to the rotating shaft 105 via a belt 107 and the drum pulley 106, and drives the rotating drum 101 to rotate in the forward and reverse directions. The rotating drum 101, water tub 102, drum drive motor 108, bearing case 103, belt 107, drum pulley 106, etc., described above, constitute a water tub unit 109.

The water tub unit 109 is elastically supported within the washing machine housing 110 by multiple suspensions 111. The lower ends of the suspensions 111 are connected to the top of the water tub 102, and the upper ends of the suspensions 111 are connected to the top of the washing machine housing 110.

As shown in Figures 1 and 2, the base 114, which is the lower part of the washing machine housing 110, has four housing connection parts 113. The water tub unit 109 is connected to the base 114 by two first dampers 115 and two second dampers 116, i.e., four dampers. In this embodiment, the four water tub connection parts 112 and housing connection parts 113 are arranged downwards towards the rear side. The four dampers connect the water tub connection parts 112 and housing connection parts 113 to suppress vibration of the water tub unit 109.

In addition, mounting legs 118 are provided at the four corners of the bottom of the base 114 at the bottom of the washing machine housing 110.

(1-1-2. Damper configuration)
In this embodiment, the first damper 115 is configured with a single action specification that generates a damping force of F1 when slid in the extension direction. The second damper 116 is configured with a double action specification that generates a damping force only when slid by a predetermined value or more in the extension direction. The second damper 116 generates a damping force of F2 only when an amplitude of 10 mm or more occurs in the extension direction. Both F1 and F2 are positive values and are set so that F1<F2.

As shown in FIG. 2, the two first dampers 115 are arranged to face each other across the center of gravity G of the water tank unit 109. Similarly, the two second dampers 116 are arranged to face each other across the center of gravity G of the water tank unit 109.

In this embodiment, a virtual line that passes through the center of gravity G in the front-rear direction and divides the water tank unit 109 in the left-right direction is defined as virtual line L1. A virtual line that passes through the center of gravity G in the left-right direction and divides the water tank unit 109 in the front-rear direction is defined as virtual line L2. The first damper 115 arranged on the front side of the virtual line L2 and to the left of the virtual line L1 is defined as first damper 115a. The first damper 115 arranged on the rear side of the virtual line L2 and to the right of the virtual line L1 is defined as first damper 115b. The second damper 116 arranged on the front side of the virtual line L2 and to the right of the virtual line L1 is defined as second damper 116a. The second damper 116 arranged on the rear side of the virtual line L2 and to the left of the virtual line L1 is defined as second damper 116b.

As shown in FIG. 3, the angle between the extension direction of the first damper 115a and the vertical direction is defined as angle β1, and the angle between the extension direction of the first damper 115b and the vertical direction is defined as angle β2. The angle between the extension direction of the second damper 116a and the vertical direction is defined as angle α1, and the angle between the extension direction of the second damper 116b and the vertical direction is defined as angle α2.

As shown in FIG. 3, the second damper 116a and the first damper 115b are arranged in the direction of rotation of the rotating drum 101 during the spin-drying process (on the right side as seen from the front when the rotating drum 101 rotates to the right (clockwise, arrow A) as seen from the front). The first damper 115a and the second damper 116b are arranged in the opposite direction to the rotation of the rotating drum 101 during the spin-drying process (on the left side as seen from the front when the rotating drum 101 rotates to the right (clockwise, arrow A) as seen from the front).

In this embodiment, the distance between the second damper 116a and the virtual line L2 is shorter than the distance between the first damper 115a and the virtual line L2. Similarly, the distance between the second damper 116b and the virtual line L2 is shorter than the distance between the first damper 115b and the virtual line L2.

As a result, since the second damper 116b is not placed in a corner on the rear side of the water tub unit 109, other components including the drum drive motor 108 can be placed there. Also, since the second damper 116a is not placed in a corner on the front side of the water tub unit 109, other components including the drainage path 117 can be placed there.

(1-2. Operation)
The operation and function of the washer/dryer 1 configured as above will be described below.

(1-2-1. Washing Operation)
The washing operation will be described below.

When the washing operation is started, the washing process is executed first. In the washing process, after the water supply operation to supply water into the water tub 102 is executed, the agitation operation in which the rotating drum 101 rotates forward, stops, reverses, and stops repeatedly is executed for a predetermined time. In the agitation operation, the clothes stored in the rotating drum 101 are lifted in the direction of rotation by several protruding plates for agitating the clothes, and then dropped from the lifted height. As a result, the clothes stored in the rotating drum 101 are subjected to a beating wash action.

Then, the spin-drying process is performed. In the spin-drying process, the drain valve is opened and the water in the water tub 102 is drained to the outside via the drain path 117. The rotating drum 101 is rotated at high speed for a predetermined time with the drain valve open. As a result, the moisture contained in the clothes is dehydrated by centrifugal force and drained via the drain path 117.

Then, the rinsing process is carried out. In the rinsing process, as in the washing process, water is supplied to the water tub 102, and then an agitation operation in which the rotating drum 101 rotates forward, stops, reverses, and stops repeatedly is carried out for a predetermined period of time. This dilutes the detergent components contained in the clothes and rinses them out.

Then, the spin-drying process is performed. After the spin-drying process is completed, the washing operation ends. In the case of a drum-type washing machine equipped with a drying function, the drying process may be performed after the spin-drying process is completed. After the drying process is completed, the washing and drying operation ends.

(1-2-2. Operation of the damper during the dehydration process)
The vibration of water tub unit 109 and washing machine housing 110 during the spin-drying process will now be described.

The rotation speed of the rotating drum 101 during the spin-drying process is increased through the rotation speeds corresponding to each vibration mode described below, and is made to reach a maximum rotation speed of 1600 r/min. During the spin-drying process, if the clothes stored in the rotating drum 101 stick unevenly to the inner wall of the rotating drum 101 due to centrifugal force, an unbalanced load is generated. The unbalanced load becomes a vibration source and vibrates the rotating drum 101. The vibration of the rotating drum 101 is transmitted to the washing machine housing 110 via the suspension 111 and four dampers, and is transmitted to the installation floor surface via the installation legs 118 provided at the bottom of the washing machine housing 110.

The vibration of the water tub unit 109 causes the structure (water tub unit 109, washing machine housing 110, and the floor on which the washing machine is placed) to resonate in response to the natural frequency of the structure. The vibration modes of the spin-drying process are shown in Table 1. To suppress problems that may be caused by the resonance phenomenon that occurs in each vibration mode, it is necessary to appropriately generate the damping force of the damper in each vibration mode.

When the rotation speed of the rotating drum 101 reaches a value corresponding to the natural frequency of the water tank unit 109, the primary resonance of the water tank unit 109 occurs. Vibration mode A, which is the primary resonance of the water tank unit 109, exists when the rotation speed of the rotating drum 101 is in the range of approximately 100 to 160 r/min.

In vibration mode A, front-back and left-right vibrations of the water tub unit 109 occur as a resonance phenomenon. Vibration mode B, which is the secondary resonance of the water tub unit 109, exists in a range of rotation speeds of the rotating drum 101 of approximately 160 to 300 r/min. In vibration mode B, up-down and rotational vibrations of the water tub unit 109 occur as a resonance phenomenon, which may cause malfunctions such as the water tub unit 109 colliding with the washing machine housing 110.

In this embodiment, first damper 115 is disposed in a substantially horizontal direction, and second damper 116 is disposed in a substantially vertical direction. That is, in this embodiment, angle α is smaller than angle β. As a result, first damper 115 exerts a stronger damping force on horizontal vibrations of water tank unit 109, and second damper 116 exerts a stronger damping force on vertical vibrations of water tank unit 109. This makes it possible to suppress vibrations of water tank unit 109 and to suppress problems caused by resonance.

In vibration mode A and vibration mode B, the water tank unit 109 vibrates greatly in both the vertical and horizontal directions. The amplitude in the extension direction of the second damper 116a and the second damper 116b is greater than approximately 10 mm, causing a damping force in the second damper 116. As a result, the first damper 115 and the second damper 116 cause a damping force in the horizontal and vertical directions, so that the front-to-back and left-to-right vibrations of the water tank unit 109 and the up-to-down and rotational vibrations of the water tank unit 109 can be effectively suppressed.

When the rotation speed of the rotating drum 101 reaches a value corresponding to the natural vibration frequency of the washing machine housing 110, resonance of the washing machine housing 110 occurs. Vibration mode C, which is the resonance of the washing machine housing 110, exists when the rotation speed of the rotating drum 101 is in the range of approximately 500 to 700 r/min. In vibration mode C, the washing machine housing 110 vibrates back and forth and left and right as a resonance phenomenon. This resonance phenomenon may cause the washing machine housing 110 to shake significantly, generating abnormal noise, or causing problems such as the washing machine housing 110 colliding with objects around the washing machine.

In this embodiment, therefore, the total damping force of the damping force applied in the vertical direction by first damper 115a and the damping force applied in the vertical direction by second damper 116b is substantially equal to the total damping force applied in the vertical direction by first damper 115b and the damping force applied in the vertical direction by second damper 116a. As a result, the total damping force of the vertical damping forces applied to the left and right of washing machine housing 110 is substantially equal, so that it is possible to effectively prevent the vibration of washing machine housing 110 from being amplified by the resonance phenomenon.

When the rotation speed of the rotating drum 101 reaches a value corresponding to the natural frequency of the floor on which the washing machine is installed, resonance of the installation floor occurs. Vibration mode D, which is resonance of the installation floor, exists when the rotation speed of the rotating drum 101 is in the range of approximately 1000 to 1600 r/min. In vibration mode D, floor vibration occurs as a resonance phenomenon. In vibration mode D, although the amplitude of the vibration of the water tub unit 109 itself is small, there is a risk that the resonance phenomenon will cause a problem in which the floor on which the washing machine is installed resonates and shakes.

In this embodiment, the second damper 116, which is arranged in a substantially vertical direction, is configured with a double action specification. Therefore, the second damper 116 does not generate a damping force in vibration mode D, in which the amplitude of the water tank unit 109 in the extension direction is less than approximately 10 mm. That is, in vibration mode D, only the first damper 115 generates a damping force. Therefore, in vibration mode D, the damping force is generated mainly in the horizontal direction, and the damping force acting in the vertical direction, which may shake the installation floor, is very small. This reduces the vertical vibration transmitted to the installation floor, thereby effectively suppressing shaking of the installation floor itself and the surrounding floors.

In this way, the four dampers in this embodiment generate damping forces in the horizontal and vertical directions in vibration modes A, B, and C, and generate mainly horizontal damping forces in vibration mode D. This effectively suppresses both opposing resonance phenomena depending on the vibration mode, and reduces vibrations of the water tub unit 109 and the washing machine housing 110 from low rotation speeds to high rotation speeds.

Furthermore, in conventional washing machines, if the left-right components of the damping forces of the dampers are different, it is not possible to dampen multi-directional vibrations that combine rotational and translational motions around the center of gravity of the water tub unit, and the water tub unit ends up coming into contact with the housing. Also, if the up-down components of the damping forces of the dampers arranged in the opposite direction to the rotational direction of the rotating drum are different, the vibrations of the water tub unit are transmitted to the floor, causing the housing to shake significantly.

In the present embodiment, the first damper 115 is arranged such that the first damper 115a and the first damper 115b are substantially symmetrical with respect to the center of gravity G. That is, the distance A2 between the first damper 115a and the center of gravity G is substantially equal to the distance A1 between the first damper 115b and the center of gravity G. Similarly, the second damper 116 is arranged such that the second damper 116a and the second damper 116b are substantially symmetrical with respect to the center of gravity G. That is, the distance B2 between the second damper 116a and the center of gravity G is substantially equal to the distance B1 between the second damper 116b and the center of gravity G.

As a result, bias in the damping force is unlikely to occur in vibration modes A and B, in which the damping forces of both the first damper 115 and the second damper 116 are acting, and in vibration mode D, in which only the damping force of the first damper 115 is acting. Therefore, the translational and pitching vibration components occurring in the water tank unit 109 can be effectively suppressed.

Furthermore, in this embodiment, the first damper 115a is disposed on the front side of the virtual line L2 and to the left of the virtual line L1, and the first damper 115b is disposed on the rear side of the virtual line L2 and to the right of the virtual line L1. The second damper 116a is disposed on the front side of the virtual line L2 and to the right of the virtual line L1, and the second damper 116b is disposed on the rear side of the virtual line L2 and to the left of the virtual line L1. That is, one damper is disposed in each of the four regions separated by the virtual lines L1 and L2.

This effectively suppresses vibrations in the yawing component in addition to the translational and pitching components.

(1-3. Effects, etc.)
As described above, the washing machine in this embodiment comprises washing machine housing 110, water tub 102 formed in a cylindrical shape with a bottom, rotating drum 101 rotatably arranged within water tub 102, rotating shaft 105 fixed to the bottom of rotating drum 101, drum drive motor 108 that rotates rotating drum 101 via rotating shaft 105, water tub unit 109 including water tub 102, rotating drum 101, rotating shaft 105 and drum drive motor 108, suspension 111 that elastically connects an upper part of washing machine housing 110 to water tub unit 109, and a plurality of dampers that connect a lower part of washing machine housing 110 to a lower part of water tub 102 and damp vibrations of water tub unit 109. The damper includes a first damper 115 arranged approximately horizontally and a second damper 116 arranged approximately vertically and generating a damping force when slid a distance of a predetermined value of approximately 10 mm or more, and two first dampers 115 and two second dampers 116 are provided, and the first dampers 115 are arranged at a position farther away from the center of gravity G than the second dampers 116, and the two first dampers 115 are attached to the washing machine housing 110 so as to face each other across the center of gravity G.

This effectively damps the vibrations of the water tank unit 109, which include translational and rotational components, and also prevents the vertical vibrations of the water tank unit 109 from being transmitted to the housing.

This allows both vibrations of the water tank unit 109 and the installation floor to be suppressed.

As in this embodiment, the two second dampers 116 may be attached to the washing machine housing 110 at a position closer to the center of gravity G of the water tub unit 109 than the first damper 115.

This makes it possible to prevent vertical vibrations of the water tub unit 109 from being transmitted to the housing without placing the second damper 116 at a position that is approximately a corner of the washing machine housing 110.

This allows other components to be placed in the corners of the washing machine housing 110 while suppressing vibrations on the installation floor.

As in this embodiment, the two first dampers 115 may be attached to the water tank unit 109 at positions that are approximately point-symmetrical with respect to the center of gravity G of the water tank unit 109, and the two second dampers 116 may be attached to the water tank unit 109 at positions that are approximately point-symmetrical with respect to the center of gravity G of the water tank unit 109.

As a result, whether the damping forces of both the first damper 115 and the second damper 116 are acting or only the damping force of the first damper 115 is acting, the damping forces are less likely to be biased. Therefore, the translational and pitching vibrations occurring in the water tub unit 109 can be effectively suppressed, and the vibrations of the washing machine housing 110 can also be effectively suppressed.

As in this embodiment, the damper may be attached to the aquarium unit 109 so that one damper is positioned in one of the four regions divided by an imaginary line L1 that passes through the center of gravity of the aquarium unit 109 and bisects the aquarium unit 109 into a left side and a right side, and an imaginary line L2 that passes through the center of gravity G of the aquarium unit 109 and bisects the aquarium unit 109 into a front side and a rear side.

This ensures that the damping forces of the damper are approximately equal in the horizontal and vertical directions relative to the center of gravity of the water tank unit 109.

As a result, the translational, pitching, and yawing components of vibrations occurring in the water tub unit 109 can be effectively suppressed, and vibrations in the washing machine housing 110 can also be effectively suppressed.

As in this embodiment, a control unit that controls the spin-drying process may be provided, and a first damper 115 may be disposed in front of the center of gravity G of the water tub unit 109 and in a position opposite to the direction in which the rotating drum 101 rotates during the spin-drying process.

As a result, if an eccentric load occurs at the rear of the water tub unit 109 during the spin cycle, the vibration of the water tub unit 109, which includes translational and rotational components, can be effectively damped.

As a result, even if an eccentric load occurs behind the tub unit during the spin cycle, vibration of the washing tub can be effectively suppressed.

(Embodiment 2)
The washing machine in the second embodiment differs from that in the first embodiment in that the damper is disposed differently. Other configurations not described are substantially the same as those in the first embodiment.

The second embodiment will be explained below using Figure 5.

(2-1. Configuration)
In this embodiment, the distance C1 between the second damper 116a and the virtual line L2 is approximately the same as the distance D1 between the first damper 115a and the virtual line L2. Similarly, the distance C2 between the second damper 116b and the virtual line L2 is approximately the same as the distance D2 between the first damper 115b and the virtual line L2.

(2-2. Effects, etc.)
This allows the four dampers to be spaced apart. The second embodiment is preferably used in a washing machine equipped with a direct drive motor that does not have the belt 107 between the rotating shaft 105 and the drum drive motor 108.

(Embodiment 3)
The washing machine in the third embodiment differs from the first and second embodiments in that the damper is disposed differently. Other configurations not described are substantially the same as the first and second embodiments.

The third embodiment will be explained below with reference to Figure 6.

(3-1. Configuration)
In the washing machine of the present embodiment, first dampers 115a and 115b are disposed on the left side of the imaginary line L1, and second dampers 116a and 116b are disposed on the right side of the imaginary line L1.

(3-2. Effects, etc.)
This eliminates the need to place second damper 116b in a corner of water tub unit 109, making it possible to secure space to place other components on the right side of the washing machine.

The first dampers 115a, 115b and the second dampers 116a, 116b may be switched left and right.

(Embodiment 4)
The washing machine in the fourth embodiment differs from the first, second and third embodiments in that the damper is disposed differently. Other configurations not described are substantially the same as the first, second and third embodiments.

The fourth embodiment will be explained below using Figure 7.

(4-1. Configuration)
In the washing machine of this embodiment, the first dampers 115a and 115b are disposed on the left side of the imaginary line L1, and the second dampers 116a and 116b are disposed on the right side of the imaginary line L1. The distance between the two second dampers 116a and 116b is shorter than the distance between the two first dampers 115a and 115b.

(4-2. Effects, etc.)
This eliminates the need to place second damper 116b in a corner of water tub unit 109, making it possible to secure space to place other components on the right side of the washing machine.

The first dampers 115a, 115b and the second dampers 116a, 116b may be switched left and right.

Other Embodiments
As described above, the first to fourth embodiments have been described as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. In addition, it is also possible to combine the components described in the first to fourth embodiments to create new embodiments.

Therefore, other embodiments are given below as examples.

In the first embodiment, a washing machine that rotates the rotating drum 101 clockwise during the spin-drying process has been described. The spin-drying process may be any process that spins laundry by rotating the rotating drum 101 in one direction. Therefore, the rotation direction during spin-drying is not limited to clockwise. In a washing machine that rotates the rotating drum 101 counterclockwise during the spin-drying process, the damper may be disposed in the opposite position to that in the first embodiment.

This disclosure is applicable to devices in which vibrations occur as the rotating drum rotates. Specifically, the present invention is applicable to washing machines, washer-dryers, clothes dryers, etc.

REFERENCE SIGNS LIST 101 Rotating drum 102 Water tub 103 Bearing case 104 Bearing 105 Rotating shaft 106 Drum pulley 107 Belt 108 Drum drive motor 109 Water tub unit 110 Washing machine housing 111 Suspension 112 Water tub connection part 113 Housing connection part 114 Base part 115 First damper 115a First damper 115b First damper 116 Second damper 116a Second damper 116b Second damper 117 Drainage path 118 Installation leg

Claims (4)

A housing and
A water tank formed in a cylindrical shape with a bottom,
A rotating drum rotatably disposed within the water tank;
A rotating shaft fixed to the bottom of the rotating drum;
a motor that rotates the rotary drum via the rotary shaft;
a water tub unit including the water tub, the rotating drum, the rotating shaft, and the motor;
a suspension that elastically connects an upper portion of the housing and the water tub unit;
a plurality of dampers that connect a lower portion of the housing and a lower portion of the water tank and damp vibrations of the water tank unit;
Equipped with
The damper is
a first damper disposed to face each other across a center of gravity of the water tub unit when viewed from above;
a second damper that is disposed substantially vertically so as to face each other across the center of gravity of the water-tub unit , and that generates a damping force when an amplitude equal to or greater than a predetermined value occurs , and does not generate the damping force when an amplitude is smaller than the predetermined value ;
Including,
The first dampers and the second dampers are each provided in pairs,
An angle α between the second damper and the vertical direction is smaller than an angle β between the first damper and the vertical direction .
washing machine. In a top view, a virtual line L1 that passes through the center of gravity of the water tank unit in the front-rear direction and divides the water tank unit into left and right parts, and a virtual line L2 that passes through the center of gravity in the left-right direction and divides the water tank unit into front and rear parts are defined. In the four regions separated by the virtual line L1 and the virtual line L2,
the first damper and the second damper, which are arranged to face each other across the center of gravity, are attached to the water tub unit such that one damper is arranged in one of the four regions;
In each of the front and rear regions divided by the virtual line L2, the two second dampers arranged in each of the front and rear regions are attached to the water tank unit at a position closer to the center of gravity of the water tank unit and at a shorter distance to the virtual line L2 than the two first dampers arranged in each of the front and rear regions .
The washing machine according to claim 1. the two first dampers are attached to the water tank unit so as to be substantially symmetrical with respect to a center of gravity of the water tank unit,
The two second dampers are attached to the water tank unit so as to be substantially symmetrical with respect to the center of gravity of the water tank unit.
The washing machine according to claim 1 or 2. A control unit is provided for controlling at least the dehydration process,
the first damper is disposed at a position forward of the center of gravity of the water tub unit and at a position opposite to the direction in which the rotating drum rotates during the dehydration process;
The washing machine according to any one of claims 1 to 3 .