JP6139263B2 - Washing machine - Google Patents

Description

  Embodiments described herein relate generally to a washing machine.

  Conventionally, in a washing machine, especially a drum type washing machine, a water tank is located inside the outer box, and a drum that is a rotating tub is located inside the water tank, and this drum is driven to rotate by a motor outside the water tank. It has come to be. The water tank is elastically supported by a suspension on the bottom plate portion of the outer box, and the suspension is provided with a damper that attenuates the vibration of the water tank accompanying the vibration of the drum (see, for example, Patent Document 1). ).

JP-A-2005-245577

  FIG. 8 shows a change in the rotation of the drum during the dehydration process, and (b) shows a change in the resonance of the water tank. As shown in FIG. 8 (a), during the dehydration process, the drum is rotated at a constant low speed (laundry application control) so that the laundry is first applied evenly to the inner peripheral surface of the drum. Then, after slightly increasing the rotation speed, rotate the water at a constant speed (drainage) to discharge the water accumulated in the water tank, further increase the rotation speed, and then collect the water again in the water tank. Rotate at a constant speed (drainage) to discharge water, increase the rotation speed, rotate at a constant speed, increase the rotation speed, and rotate at high speed.

  When the rotational speed of the drum is sequentially increased in this way, as shown in FIG. 8B, resonance in the horizontal direction, the front-rear direction, and the vertical direction appears mainly in the water tank as shown in FIG. The resonance of these water tanks varies depending on the characteristics of the vibration system components of the product. For example, the resonance in the horizontal direction is 180 [rpm], the resonance in the front and rear direction is 200 [rpm], and the resonance in the vertical direction is 220 [rpm]. In general, it appears at different rotational speeds.

On the other hand, a suspension having a conventional damper is installed so that the axial direction of the shaft is substantially vertical in order to support a heavy water tank. The damping force of the damper works in the direction in which the shaft reciprocates. The shaft moves most greatly at the time of resonance in the vertical direction, so that the effect is more exhibited at the time of resonance in the vertical direction.
However, the aquarium vibrates in the lateral direction as it swings in the lateral direction such as left and right and front and rear due to the uneven load caused by the uneven distribution of the laundry contained in the drum. On the other hand, the suspension cannot function as effectively as the vertical direction.

  Therefore, a washing machine is provided that can appropriately obtain a damping effect as needed not only in the vertical vibrations of the water tank but also mainly in the horizontal direction.

The washing machine of the present embodiment includes an outer box, a water tank located inside the outer box, a rotating tub located inside the water tank and driven to rotate, and the water tank elastically supported inside the outer box. And a suspension having a main damper for damping mainly vibrations in the vertical direction of the water tank, a cylinder, a relative position for damping vibrations mainly in the horizontal direction of the water tank relative to the cylinder, and a position of the water tank. mainly the lateral relationship position weakening was not or damping force damping vibration of the provided with an auxiliary damper having a relative position changeable piston, the relation position between the cylinder and the piston of the auxiliary damper, mainly horizontal the water tank by changing to the relationship position mainly weakening the transverse not attenuated or damping force vibrations of the tub and relationships position for damping vibrations of the direction, before Characterized in that a changing means for switching the switching on and off of the vibration damping effect in the auxiliary damper.

Cross-sectional view of the damping function state of the auxiliary damper portion showing the first embodiment Cross section of the damping function stop state of the auxiliary damper Longitudinal side view of the entire washing machine with a part broken away Longitudinal cross section of suspension unit Schematic cross-sectional plan view of the entire washing machine FIG. 1 equivalent diagram showing the second embodiment 2 equivalent diagram The figure which shows the change (a) of the rotation of the drum in a dehydration process, and the change (b) of the resonance of a water tank

Hereinafter, an embodiment applied to a drum-type washing / drying machine will be described with reference to FIGS.
First, FIG. 3 shows the overall structure of the drum type washing and drying machine, and the outer box 1 is an outer shell. The outer box 1 has a substantially rectangular parallelepiped shape, and a laundry doorway 2 is formed at the center of the front portion (right side in FIG. 3) of which the outer box 1 is inclined. A door 3 for opening and closing is provided pivotally on the outer box 1. In addition, an operation panel 4 is provided at the upper part of the front surface of the outer box 1, and a control device 5 for operation control is provided on the back side (inside the outer box 1).

A water tank 6 is disposed inside the outer box 1. This water tank 6 has a horizontal cylindrical shape whose axial direction is front and rear (right and left in FIG. 3), and it is lifted forward by a pair of left and right suspensions (only one is shown) on a bottom plate 1a in the outer box 1. It is elastically supported in an inclined shape. The detailed structure of the suspension 7 will be described later.
A motor 8 is attached to the back of the water tank 6. In this case, the motor 8 is, for example, a direct current brushless motor, and is an outer rotor type. A rotating shaft (not shown) attached to the central portion of the rotor 8 a is placed inside the water tank 6 through the bearing housing 9. It is inserted.

  A drum 10 is disposed inside the water tank 6. This drum 10 also has a horizontal cylindrical shape in which the axial direction is front and rear, and by attaching it to the tip of the rotating shaft of the motor 8 at the center of the rear part, the drum 10 is concentric with the water tank 6 and rises forward. I support it. As a result, the drum 10 is rotated by the motor 8, and therefore the drum 10 is a rotating tank, and the motor 8 functions as a rotating tank driving device that rotates the drum 10. .

  A large number of small holes 11 are formed in the circumferential side portion (body portion) of the drum 10 over the entire area. The drum 10 and the water tub 6 both have openings 12 and 13 on the front surface, and the opening 13 of the water tub 6 and the laundry entrance / exit 2 are connected by an annular bellows 14. . As a result, the laundry entrance 2 is connected to the inside of the drum 10 through the bellows 14, the opening 13 of the water tub 6, and the opening 12 of the drum 10.

  A drain hose 16 is connected to the rear part of the bottom, which is the lowest part of the water tank 6, via a drain valve 15. A drying unit 17 is disposed above and in front of the back of the water tank 6. The drying unit 17 includes a dehumidifier 18, a blower 19, and a heater 20. The air is sucked and dehumidified in the drum 10, and then heated and circulated back into the drum 10. As a result, the laundry is dried.

  Here, the detailed structure of the suspension 7 will be described. As shown in FIG. 4, the suspension 7 roughly includes a main damper 21 and a spring 22, and the main damper 21 includes a shaft 23 and a cylinder 24. The cylinder 24 mainly closes the outer cylinder 24a and the inner cylinder 24b, caps 24c and 24d that close the openings at both ends in the axial direction (upper and lower) of the outer cylinder 24a, and the openings at both ends in the same axial direction of the inner cylinder 24b. Seals 24e and 24f.

  A piston valve 25 is attached to the lower end portion of the shaft 23, and the lower portion of the shaft 23 is inserted into the inner cylinder 24 b of the cylinder 24 together with the piston valve 25 so as to be movable in the axial direction. The portion is located above the cylinder 24 through the seal 24e, the bearing 26, and the cap 24c. The piston valve 25 has an outer peripheral surface that is in close contact with the inner peripheral surface of the inner cylinder 24b, and has a plurality of orifice holes 25a that are opened in the axial direction near the outer peripheral surface.

The inner cylinder 24b of the cylinder 24 is also filled with oil 27, which is a viscous fluid, both above and below the piston valve 25. That is, the main damper 21 of this embodiment is an oil damper, and the oil 27 is The orifice hole 25a is also filled.
A spring seat 28 is attached to a portion near the upper end of the shaft 23 located above the cylinder 24, and the spring (compression coil spring) 22 is interposed between the spring seat 28 and the upper end of the cylinder 24. I am letting.
As described above, the suspension 7 is assembled.

  An attachment member 29 is provided at the lower end portion of the cylinder 24. The attachment member 29 is attached to an attachment plate 30 provided on the bottom plate 1a of the outer box 1 via vibration-proof cushions 31 and 32 as shown in FIG. By fastening with the nut 33, the cylinder 24 is attached to the attachment plate 30, and as a result, attached to the bottom plate 1a of the outer box 1.

On the other hand, the shaft 23 has a mounting portion 23a at its upper end, and this mounting portion 23a is attached to a mounting plate 34 provided in the water tank 6 via vibration-proof cushions 35 and 36 as shown in FIG. By fastening with a nut 37, the shaft 23 is attached to the attachment plate 34 and eventually attached to the water tank 6.
In this way, the water tank 6 is mounted on the bottom plate 1a of the outer box 1 with the suspension 7 interposed therebetween, and the water tank 6 is elastically supported mainly in the vertical direction by the suspension 7.

  On the other hand, between the upper part of the front part of the water tank 6 and the front side of the top plate part 1b of the outer box 1 and the rear side thereof, as shown in FIG. 5 as well as FIG. The springs 38 and 39 made of tension coil springs are stretched. In short, the springs 38 and 39 are stretched in a V shape (see FIG. 3), and the water tank 6 is supported in the direction of support by the suspension 7 by the springs 38 and 39. For example, the water tank 6 is elastically supported mainly in the front-rear direction and the water tank 6 is prevented from falling.

  An auxiliary damper 40 is installed mainly in the left-right direction (see arrows in FIG. 5) between the upper part of the rear part of the water tank 6 and the upper part of the side plate part (right side plate part as an example) 1c of the outer box 1. An auxiliary damper 41 is installed mainly in the front-rear direction (see the arrow in FIG. 5) between the upper part of the rear part of the water tank 6 and the upper part of the rear plate part 1d of the outer box 1 (the auxiliary damper 40 is It may be installed between the upper part of the left side plate part 1e of the outer box 1). As described above, the water tank 6 is supported in an upwardly inclined shape, and for this reason, the space in the outer box 1 on the upper side of the rear part of the water tank 6 is widened. Auxiliary dampers 40 and 41 are disposed on the side.

  The auxiliary dampers 40 and 41 have the same structure, and are smaller than the main damper 21 as shown in FIG. FIG. 1 shows the structure of these auxiliary dampers 40 and 41, and the cylinder 42 is mainly used. The cylinder 42 has a stepped cylindrical shape (two-stage cylindrical shape) having a cylindrical large-diameter portion 42a and a cylindrical small-diameter portion 42b that are concentrically connected in the axial direction and integrated. The piston 44 attached to the tip of the shaft 43 is inserted so as to be movable together with the vicinity of the shaft 43.

  The piston 44 has an outer diameter equivalent to the inner diameter of the small-diameter portion 42b of the cylinder 42. When the piston 44 is located in the small-diameter portion 42b and moves within the small-diameter portion 42b, the outer peripheral surface is the inner diameter of the small-diameter portion 42b. When the inner surface of the large-diameter portion 42a moves within the large-diameter portion 42a, the outer peripheral surface is not in close contact (separated) and does not rub against the inner surface of the large-diameter portion 42a. Is. Note that the tip of the piston 44 (the side opposite to the shaft 43 side) is provided with a tapered taper 44a, which hinders the movement of the piston 44 from the large diameter portion 42a of the cylinder 42 to the small diameter portion 42b. To be done without.

In addition, these auxiliary dampers 40 and 41 have a rod 45 projecting concentrically outside the small diameter portion 42 b of the cylinder 42, and a ball joint 46 at the tip of the rod 45. . An attachment member 47 is fitted and connected to the ball joint 46, and the attachment member 47 is attached to the upper part of the rear portion of the water tank 6 by a plurality of screws 48.
A mounting base 49 is attached to the end of the shaft 43 protruding from the large-diameter portion 42a of the cylinder 42. The mounting base 49 is attached to the auxiliary damper 40 via springs 50 made up of a plurality of tension coil springs. Is attached to the upper part of the side plate part (right plate part as an example) 1c of the outer box 1, and the auxiliary damper 41 is attached to the upper part of the rear plate part 1d of the outer box 1.

FIG. 1 also shows a piston moving device 51 for moving the mounting base 49, and hence the piston 44 of the auxiliary dampers 40, 41, between the large diameter portion 42a and the small diameter portion 42b of the cylinder 42. The moving device 51 includes a stepping motor 52 as a drive source, an elliptical cam 53 is attached to the output shaft 52 a of the stepping motor 52, and the outer peripheral surface of the cam 53 is brought into contact with the mounting base 49.
1 shows a state in which the outer circumferential surface of the cam 53 farthest from the output shaft 52a of the stepping motor 52 is in contact with the mounting base 49. At this time, the pistons 44 of the auxiliary dampers 40 and 41 are in contact with each other. Is located in the small diameter portion 42 b of the cylinder 42.

  On the other hand, FIG. 2 shows a state in which the outer peripheral surface in the minor axis direction of the cam 53 is in contact with the mounting base 49 by operating the stepping motor 52 and rotating the cam 53. The spring 50 contracts and the mounting base 49 is moved to the outer case 1 side (anti-water tank 6 side) with the shaft 43 and the piston 44 of the auxiliary dampers 40 and 41, whereby the piston 44 is moved from within the small diameter portion 42 b of the cylinder 42. It has moved into the large diameter portion 42a.

  Furthermore, when the stepping motor 52 is operated and the cam 53 is rotated from that state, the outer circumferential surface of the cam 53 farthest from the output shaft 52 a of the stepping motor 52 comes into contact with the mounting base 49. The mounting base 49 is moved to the water tank 6 side (opposite outer box 1 side) with the shaft 43 and the piston 44 of the auxiliary dampers 40 and 41 while extending the spring 50, whereby the piston 44 is moved to the large diameter portion of the cylinder 42. It moves from within 42a into the small diameter portion 42b.

Next, the function and effect of the drum type washing and drying machine having the above configuration will be described.
In the drum-type washing / drying machine having the above-described configuration, when the control device 5 starts operation based on the operation of the operation panel 4, washing, dehydration, and drying processes are typically performed.
Among them, the washing process is performed by the drum 10 being rotated at low speed alternately in both forward and reverse directions by the motor 8 after a predetermined level of water is supplied from a water supply valve (not shown) into the water tank 6. Thus, the laundry previously stored in the drum 10 is lifted and then dropped (tumbling) is repeatedly stirred and washed.

In the washing process, there are a washing operation for washing with water containing a detergent and a rinsing operation for washing with fresh water. In any of these operations, the above-described operation is performed, and the drain valve 15 is turned on after the completion of these operations. A draining operation is performed in which the water in the water tank 6 is released and discharged to the outside through the drainage hose 16.
Next, the dehydration process is performed by rotating the drum 10 at a high speed in one direction by the motor 8 with the drain valve 15 being opened, so that the laundry after washing in the drum 10 has a small hole. 11 is centrifuged and dehydrated.

  The drying process is performed by rotating the drum 10 alternately in the forward and reverse directions by the motor 8 at the same time and simultaneously operating the drying unit 17. In the drying unit 17, as described above, 6 is repeatedly circulated by the blower 19, dehumidified by the dehumidifier 18, then heated by the heater 20, and returned to the water tank 6, thereby repeating the dehydration in the drum 10. The laundry is dried.

  During the operation of the drum type washing and drying machine, when the drum 10 is rotated, the drum 10 vibrates, and particularly, the drum 10 vibrates greatly at the time of dehydration in which the rotation speed is gradually increased. Further, in that case, if the laundry in the drum 10 is unevenly distributed, the drum 10 vibrates more greatly due to the uneven load. When the drum 10 vibrates in this way, the water tank 6 that accommodates the drum 10 and is integrated with the drum 10 also vibrates.

With respect to the vibration of the drum 10 and the water tank 6, particularly the vibration in the vertical direction, the shaft 23 of the suspension 7 reciprocates vertically in the axial direction while extending and contracting the spring 22 integrally with the water tank 6. As the shaft 23 reciprocates, the piston valve 25 reciprocates up and down in the oil 27 within the cylinder 24, whereby the oil 27 passes through the orifice hole 25 a of the piston valve 25. Here, due to the viscosity of the oil 27, a damping force is generated in the suspension 7, and the vibration of the water tank 6 mainly in the vertical direction is attenuated.
In particular, in the dehydration process, as shown in FIG. 8, as the rotational speed of the drum 10 is increased, resonance in the horizontal direction, the front-rear direction, and the vertical direction of the water tank 6 appears in order.

  On the other hand, for the auxiliary dampers 40 and 41, as described above, when the stepping motor 52 that is the driving source of the piston moving device 51 is operated, the mounting base 49 is moved via the cam 53, and accordingly, the auxiliary dampers are moved. The pistons 40 and 41 are moved from the small diameter portion 42b of the cylinder 42 to the large diameter portion 42a, or from the large diameter portion 42a to the small diameter portion 42b. When the pistons 44 of the auxiliary dampers 40 and 41 are moved and positioned in the small-diameter portion 42b of the cylinder 42 (FIG. 1), the piston 44 has an outer peripheral surface closely contacting the inner peripheral surface of the small-diameter portion 42b as described above. It comes to rub.

  On the other hand, when the pistons 44 of the auxiliary dampers 40 and 41 are located in the large diameter portion 42a of the cylinder 42 (FIG. 2), the piston 44 has an outer peripheral surface closely in contact with the inner peripheral surface of the large diameter portion 42a as described above. It does not rub (separate).

  Therefore, when the resonance of the water tank 6 occurs mainly in the left-right direction in the lateral direction, the piston 44 of the auxiliary damper 40 is moved into the small diameter portion 42 b of the cylinder 42. Then, the piston 44 of the auxiliary damper 40 comes to rub against the inner peripheral surface of the small-diameter portion 42b of the cylinder 42 as described above, and in this state, the cylinder 42 mainly moves in the left-right direction of the water tank 6. Since the vibration is caused in the axial direction of the cylinder 42 with the vibration, the piston 44 of the auxiliary damper 40 is rubbed against the inner peripheral surface of the small-diameter portion 42b of the cylinder 42 with respect to this vibration. The vibration of the water tank 6 is attenuated. That is, the auxiliary damper 40 is a friction damper.

  Accordingly, at this time, the relative position between the cylinder 42 and the piston 44 of the auxiliary damper 40 is a relative position that attenuates vibrations in the lateral direction of the water tank 6, in particular, mainly in the left-right direction. It is mainly provided at a position to attenuate the vibration in the left-right direction.

  If the left and right resonance region of the water tank 6 is passed, the piston 44 of the auxiliary damper 40 is returned from the small diameter portion 42b of the cylinder 42 into the large diameter portion 42a. Then, the piston 44 of the auxiliary damper 40 has its outer peripheral surface not in close contact with the inner peripheral surface of the large-diameter portion 42a and does not rub in the large-diameter portion 42a. The Accordingly, at this time, the relative position between the cylinder 42 and the piston 44 of the auxiliary damper 40 is a relative position that does not attenuate the vibration of the water tank 6 mainly in the left-right direction, and the piston moving device 51 for the auxiliary damper 40 is The auxiliary damper 40 functions as a changing means for changing the relative position between the cylinder 42 and the piston 44.

  Next, when resonance of the water tank 6 occurs mainly in the front-rear direction, the piston 44 of the auxiliary damper 41 is moved into the small diameter portion 42 b of the cylinder 42. Then, the piston 44 of the auxiliary damper 41 comes to rub against the inner peripheral surface of the small-diameter portion 42b of the cylinder 42 as described above, and in this state, the cylinder 42 mainly moves in the front-rear direction of the water tank 6. Since the vibration is caused in the axial direction of the cylinder 42 in response to the vibration, the piston 44 of the auxiliary damper 41 is mainly subjected to the friction force against the inner peripheral surface of the small-diameter portion 42b of the cylinder 42 with respect to this vibration. The vibration of the water tank 6 is attenuated. That is, the auxiliary damper 41 is also a friction damper.

  Accordingly, at this time, the relative position between the cylinder 42 and the piston 44 of the auxiliary damper 41 is a relative position that attenuates vibrations in the lateral direction of the water tank 6, particularly mainly in the front-rear direction. It is mainly provided at a position where vibrations in the front-rear direction are attenuated.

  After passing the resonance region in the front-rear direction of the water tank 6, the piston 44 of the auxiliary damper 41 is returned from the small-diameter portion 42b of the cylinder 42 into the large-diameter portion 42a. Then, the piston 44 of the auxiliary damper 41 has its outer peripheral surface not in close contact with the inner peripheral surface of the large-diameter portion 42a and does not rub in the large-diameter portion 42a. The Accordingly, at this time, the relative position between the cylinder 42 and the piston 44 of the auxiliary damper 41 is a relative position where the vibration in the water tank 6 mainly in the front-rear direction is not attenuated, and the piston moving device 51 for the auxiliary damper 41 is The auxiliary damper 41 functions as changing means for changing the relational position between the cylinder 42 and the piston 44.

The relative positions of the cylinders 42 and the pistons 44 of the auxiliary dampers 40 and 41 are relative. Instead of moving the pistons 44 by moving the cylinders 42 stationary as described above, the pistons 44 are stationary. In this case, the cylinder 42 may be moved.
Further, when the resonance of the water tank 6 occurs mainly in the vertical direction, the suspension 7 attenuates the vibration of the water tank 6 mainly in the vertical direction by the above-described operation, and attenuates the amplitude of the water tank 6.

  After that, when the drum 10 reaches an area where the drum 10 rotates at high speed, the pistons 44 of the auxiliary dampers 40 and 41 are both held in the large diameter portion 42a of the cylinder 42, and the water tank 6 is mainly used when the drum 10 rotates at high speed. The vibrations in the left and right and front and rear directions are prevented from being transmitted to the outer case 1, and as a result, the vibrations are not transmitted to the floor of the house where the washing machine is installed.

As described above, in the present embodiment, in the washing / drying machine (washing machine) including the suspension 7 having the main damper 21 that mainly attenuates the vibration in the vertical direction of the water tank 6, the cylinder 42 and the water tank with respect to the cylinder 42 are provided. Auxiliary dampers 40 and 41 having pistons 44 whose relative positions can be changed are provided at a relative position where the vibration of 6 mainly attenuates lateral vibration and a relative position where the vibration of water tank 6 mainly does not attenuate lateral vibration. , 41 is provided with a piston moving device 51 as changing means for changing the relative position between the cylinder 42 and the piston 44.
Thereby, not only the vibration of the water tank 6 mainly in the vertical direction but also the vibration effect in the horizontal direction can be appropriately obtained as necessary.

  The auxiliary dampers 40 and 41 have a large-diameter portion 42a and a small-diameter portion 42b in the cylinder 42, and the piston 44 rubs against the small-diameter portion 42b to dampen mainly vibrations in the lateral direction. In the diameter portion 42a, the piston 44 is not rubbed so as not to attenuate mainly the vibration in the lateral direction of the water tank 6, so that the vibration damping effect in the auxiliary dampers 40 and 41 can be easily and appropriately switched.

  Further, the auxiliary dampers 40 and 41 are respectively present at positions where the horizontal vibration of the water tank 6 is attenuated in the horizontal direction and positions where the vibration in the front and rear direction is attenuated. In addition, it is possible to obtain a reliable damping effect with respect to the lateral vibration and the longitudinal vibration of the water tank 6.

  Further, the auxiliary dampers 40 and 41 attenuate the resonance of the water tank 6 in accordance with the resonance generation directions of the water tank 6 mainly in the left-right direction and the front-rear direction. An effective damping effect can be obtained with respect to resonance in each direction. In addition, when two or more resonances of the water tank 6 appear at the same time, not in the order of directions, it is preferable to increase the damping forces of the auxiliary dampers 40 and 41 in both directions at the same time.

  The auxiliary dampers 40 and 41 do not attenuate vibrations mainly in the lateral direction of the water tank 6 when the drum (rotating tank) 10 rotates at high speed, and thereby the water tank 6 when the drum 10 rotates at high speed. Thus, vibrations in the left and right and front and rear directions can be prevented from being transmitted to the outer case 1, and as a result, the vibrations can be prevented from being transmitted to the floor surface of the house where the washing machine is installed.

In contrast, FIGS. 6 and 7 show the second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.
In the second embodiment, a piston moving device 61 is used in place of the piston moving device 51 of the first embodiment. The piston moving device 61 includes a stepping motor 62 as a drive source. A small gear 63 is attached to an output shaft 62 a of the stepping motor 62, and a large gear 64 is engaged with the small gear 63. The large gear 64 is attached to one end of the screw shaft 65, and the screw shaft 65 passes through the mounting base 49 and is screwed into a nut 66 attached to the mounting base 49.

Further, in this case, a cylindrical shape surrounding the stepping motor 62, the small gear 63, the large gear 64, and the like is provided between the mounting base 49 and the outer box 1 in place of the plurality of springs 50 of the first embodiment. The bellows 67 is installed.
In this configuration, when the stepping motor 62 is operated, the small gear 63 is rotated, and the large gear 64 meshed with the step gear 63 is also rotated together with the screw shaft 65. By the rotation of the screw shaft 65, the nut 66 screwed together is moved from the mounting base 49 to the outer case 1 side and the water tank 6 side together with the shaft 43 and the piston 44.

  In this way, the pistons 44 of the auxiliary dampers 40 and 41 are moved from the small diameter portion 42b of the cylinder 42 to the large diameter portion 42a, or from the large diameter portion 42a to the small diameter portion 42b. In the same way as in the first embodiment, the damping against the vibration in the front-rear direction and the switching effect thereof can be obtained, and the piston moving device 61 determines the relative position between the cylinder 42 and the piston 44 of the auxiliary dampers 40 and 41. It functions as a changing means for changing in the same manner as the piston moving device 51 of the first embodiment.

  The washing machine described above is not limited to the above embodiment. In particular, in the above embodiment, the piston 44 does not rub at the large diameter portion 42a of the cylinder 42 of the auxiliary dampers 40 and 41. Is substantially weaker than the small-diameter portion 42b, and the construction of the auxiliary dampers 40, 41 has been described in the front-rear and left-right directions, but is not limited to this, as long as the vibration of the water tank 6 can be effectively damped. The installation direction and the number of installations are not limited.

In addition, the washing machine as a whole is not limited to the drum type, and can be similarly applied to a vertical washing machine having a water tank and a rotating tank in the vertical axis shape, and has no drying function. But it ’s okay.
In addition, although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is an outer box, 6 is a water tank, 7 is a suspension, 8 is a motor (rotary tank drive device), 10 is a drum (rotary tank), 21 is a main damper, 40 and 41 are auxiliary dampers, 42 is a cylinder, 42a is a large diameter part, 42b is a small diameter part, 44 is a piston, 51 and 61 are piston moving apparatuses (change means).

Claims (5)

An outer box,
A water tank located inside the outer box,
A rotating tub located inside the aquarium and driven to rotate;
In the washing machine comprising the suspension having a main damper that elastically supports the water tank inside the outer box and attenuates mainly vibrations in the vertical direction of the water tank,
A cylinder and a piston whose relative position can be changed to a relative position that attenuates mainly vibrations in the lateral direction of the water tank and a relative position that does not attenuate the vibrations in the horizontal direction of the water tank or weakens the damping force with respect to the cylinder. While providing an auxiliary damper,
The relational position between the cylinder and the piston of the auxiliary damper is changed to a relational position that attenuates mainly the lateral vibration of the water tank and a relational position that mainly does not attenuate the lateral vibration of the water tank or weakens the damping force. Accordingly, there is provided a changing means for switching on / off of the vibration damping effect in the auxiliary damper .   The auxiliary damper has a large-diameter portion and a small-diameter portion in the cylinder, and the piston rubs against the small-diameter portion to dampen vibrations mainly in the lateral direction of the water tank. 2. The washing machine according to claim 1, wherein weakening does not attenuate mainly vibrations in the lateral direction of the water tank or weakens the damping force.   The washing machine according to claim 1 or 2, wherein the auxiliary damper is present at a position that attenuates vibrations in a plurality of different directions among vibrations mainly in the lateral direction of the water tank.   4. The washing machine according to claim 3, wherein the auxiliary damper attenuates the vibration of the water tank for each direction in which the resonance of the water tank occurs.   The washing machine according to any one of claims 1 to 4, wherein the auxiliary damper does not attenuate vibrations mainly in the lateral direction of the water tank or weakens the damping force when the rotating tank rotates at high speed.

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