KR20200140699A - Damper and washing machine having the same - Google Patents

Abstract

A washing machine comprises: a case; a tub provided in the case and having a dehydrating tub rotatably mounted therein; and a damper installed between the case and the tub to attenuate vibration of the tub. The damper comprises: a plunger having one end supported by the case; a rod having one end supported by the tub and the other end movably inserted into the plunger; a housing provided to cover the outer circumferential surfaces of portions of the plunger and the rod, and including a friction material provided between the housing and the plunger to contact the outer circumferential surface of the plunger; and a switching device for switching between a first state in which the rod and the housing are combined so that the friction material can move along with the housing in the plunger while contacting the outer circumferential surface of the plunger, and a second state in which the rod and the housing are separated and only the rod can move in the plunger. Therefore, vibration can be suppressed with a simple configuration.

Description

Damper and washing machine having the same {DAMPER AND WASHING MACHINE HAVING THE SAME}

The present invention relates to a damper and a washing machine having the same.

Conventionally, it has been proposed to increase the damping force of the damper in the resonance frequency band of the low rotational speed of the tub (water tank), which is the initial stage of the washing machine spin-drying process, and to decrease the damping force of the damper when the tub (water tank) rotates high.

For example, the washing machine described in Patent Document 1 attenuates vibration by friction between a damper cylinder, a shaft inserted from one end of the damper cylinder and reciprocating in the longitudinal direction of the damper cylinder, and provided on the shaft and friction with the inner wall of the damper cylinder. And a friction member movable in a direction perpendicular to the longitudinal direction of the damper cylinder (refer to Japanese Patent Laid-Open No. 2006-29585).

It is preferable that the damping device for suppressing the vibration of the washing machine tank has a simple configuration. In addition, it is preferable that the attenuation device for suppressing vibration of at least one member of the two members moving relatively as well as the washing machine has a simple configuration.

An object of the present invention is to provide a damping device and a washing machine capable of suppressing vibration with a simple configuration.

A washing machine according to an embodiment of the present invention includes a case, a water tank provided inside the case and provided with a dewatering tank rotatably mounted therein, and a damper installed between the case and the water tank to attenuate the vibration of the water tank ( damper), wherein the damper includes a plunger whose one end is supported by the case, a rod whose one end is supported by the water tank, and the other end is movably inserted into the plunger, the outer peripheral surface of the plunger and part of the rod And a housing including a friction material provided between the plunger and contacting an outer circumferential surface of the plunger, and the rod is coupled to the housing so that the friction material is in contact with the outer circumferential surface of the plunger, And a switching device having a first state in which the inside of the plunger is movable, and a second state in which the rod is separated from the housing so that only the rod is movable inside the plunger.

The switching device may include a coupling member coupled to the rod to couple the housing and the rod, and a driving member for moving the coupling member so that the coupling member is coupled to the rod or separated from the rod.

The coupling member may include a rectangular parallelepiped-shaped portion, a protruding portion protruding from the rectangular parallelepiped-shaped portion, and a plurality of protruding portions protruding from the rectangular parallelepiped portion toward the rod.

The driving member has a case fixed to the housing, one end is accommodated in the case and fixed to the protrusion, and the other end is provided so as to protrude out of the case to move the coupling member, and the other end of the operating rod A support member to be installed, and one end supported by the case and the other end may include a coil spring supported by the support member.

When a voltage is applied to the driving member and thrust is generated in the actuating rod, the coupling member is moved in a direction toward the rod by the actuating rod, and the plurality of protrusions are coupled to the rod, so that the housing and the rod Can be combined.

When the damper is expanded and contracted while the housing and the rod are coupled, the rod and the housing are moved together with respect to the plunger, so that the damping force of the damper is increased by the frictional force generated between the friction material and the outer circumferential surface of the plunger. I can.

When the application of voltage to the driving member is stopped, the actuating rod is moved in a direction opposite to the direction toward the rod by the elastic force of the coil spring, and the plurality of protrusions are separated from the rod and the The housing and the rod can be separated.

When the damper is expanded and contracted while the housing and the rod are separated, only the rod is moved relative to the plunger to generate a friction force between the plunger and the rod, and the friction force generated between the plunger and the rod is the friction material. Since it is smaller than the frictional force generated between the outer circumferential surface of the plunger and the damper, the damping force of the damper may be smaller than when the housing and the rod are coupled.

The plunger may include a cylindrical pipe into which the rod is inserted, and a base provided on one side of the pipe and supported by the water tank.

The rod may include a rod-shaped portion inserted into the plunger, and a base provided on one side of the rod-shaped portion and supported by the case.

The rod-shaped portion may include a plurality of concave portions formed on the outer circumferential surface of the rod-shaped portion, and coupled by fitting the plurality of protrusions.

The housing may include a receiving member that surrounds an outer circumferential surface of a portion of the plunger and the rod to receive the friction material, and a regulating member provided at one end of the receiving member to regulate movement of the friction material.

The receiving member is provided to have an inner diameter smaller than the outer diameter of the friction member and the regulating member is mounted so that the friction member has an inner diameter smaller than the inner diameter of the first cylindrical portion and the first cylindrical portion to be accommodated by being sandwiched between the plunger. A third provided to have an inner diameter smaller than an inner diameter of the second cylindrical portion and larger than an outer diameter of the rod, and a second cylindrical portion for inhibiting the friction material from moving in the opposite direction of the regulating member, and a third configured to allow the rod to slide. It may include a cylindrical portion.

The rod may include a protrusion provided to protrude from the outer circumferential surface of the rod and to be caught on the third cylindrical portion when the damper is stretched to limit movement of the rod.

When the protrusion is retracted, the damper is elongated to prevent damage from hitting the plunger base when the damper is contracted, so that when the protrusion is hung on the third cylindrical portion, the end of the rod is It may be provided in a position that can be located closer to the base of the plunger than the end of the housing.

In addition, the damper according to an embodiment of the present invention is a plunger whose one end is supported by one of the two relatively moving members, one end is supported by the other member of the two members, and the other end is the A rod that is movably inserted into the plunger, a housing including a friction material provided between the plunger and an outer peripheral surface of a portion of the rod and provided between the plunger and contacting the outer peripheral surface of the plunger, and the rod are coupled to the housing A first state in which the friction material is allowed to move inside the plunger together with the housing while the friction material is in contact with the outer circumferential surface of the plunger, and a second state in which the rod is separated from the housing so that only the rod is movable inside the plunger It includes a switching device having a state.

The switching device may include a coupling member coupled to the rod to couple the housing and the rod, and a driving member for moving the coupling member so that the coupling member is coupled to the rod or separated from the rod.

The coupling member includes a rectangular parallelepiped-shaped portion in the shape of a rectangular parallelepiped, a protruding portion protruding from the rectangular parallelepiped-shaped portion, and a plurality of protrusions which are coupled to or separated from the rod by protruding from the rectangular parallelepiped portion toward the rod. I can.

The driving member has a case fixed to the housing, one end is accommodated in the case and fixed to the protrusion, and the other end is provided so as to protrude out of the case to move the coupling member, and the other end of the operating rod A support member to be installed, and one end supported by the case and the other end may include a coil spring supported by the support member.

In addition, the damper according to an embodiment of the present invention is a plunger whose one end is supported by one member of the two relatively moving members, one end is supported by the other member of the two members, and the other end is inside the plunger. A rod that is movably inserted, the plunger, and a housing including a friction material provided between the plunger and a friction material contacting the outer peripheral surface of the plunger and provided to surround the outer circumferential surface of a portion of the rod, and the rod are coupled to or coupled to the housing. And a switching device for switching a state to be separated so that a damping force caused by frictional force generated when the rod moves inside the plunger is switched.

According to the present invention, it is possible to provide a damping device and a washing machine capable of suppressing vibration with a simple configuration.

1 is a diagram showing an example of a schematic configuration of a washing machine according to the present embodiment.
2 is a diagram illustrating an example of a schematic configuration of a damper.
3 is a diagram showing an example of a combined state.
4 is a diagram showing an example of a state in which the damper is stretched in the case of a coupled state.
5 is a view showing an example of a state in which the damper is contracted in the coupled state.
6 is a view showing an example of a state in which the damper is stretched in the case of a release state.
7 is a view showing an example of a state in which the damper is contracted in the case of a release state.
8 is a diagram showing an example of the relationship between the rotational speed of the motor and the water tank vibration.
9 is a view for explaining the position of the protrusion provided on the rod-shaped portion of the rod.

The embodiments described in the present specification and the configurations shown in the drawings are only preferred examples of the disclosed invention, and there may be various modifications that may replace the embodiments and drawings of the present specification at the time of filing of the present application.

In addition, the same reference numerals or reference numerals shown in each drawing of the present specification indicate parts or components that substantially perform the same function.

In addition, terms used in the present specification are used to describe the embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features It does not preclude the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof.

In addition, terms including ordinal numbers such as “first” and “second” used in the present specification may be used to describe various elements, but the elements are not limited by the terms, and the terms are It is used only for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Meanwhile, the terms “front”, “rear”, “upper”, “lower”, “front”, “rear”, “top” and “lower” used in the following description are defined based on the drawings, and this The shape and position of each component are not limited by terms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an example of a schematic configuration of a washing machine 1 according to the present embodiment. 1 is a cross-sectional view of the washing machine 1 viewed from the right direction. The left side of Fig. 1 is the front side of the washing machine 1, the right side of Fig. 1 is the rear side of the washing machine 1, the upper side of Fig. 1 is the upper side of the washing machine 1, and the lower side of Fig. 1 is the washing machine 1 It is the lower side.

Washing machine 1 according to an embodiment of the present invention is an example of a water tank 10, a rotating body rotatably mounted inside the water tank 10, a dewatering tank 20, a water tank 10, and a dewatering tank ( A case 30 is provided to accommodate 20).

The rotating shaft 21 of the dewatering tank 20 extends in the front-rear direction, and when the washing machine 1 is viewed from the front side, the rotating direction of the dewatering tank 20 is left rotation (counterclockwise rotation).

The case 30 has a substantially rectangular parallelepiped shape and includes a steel frame 30a forming a skeleton, and an iron plate 30b having a lower rigidity than the frame 30a. An opening for inserting laundry is formed on the front surface of the case 30, and a door 31 is installed in the case 30 to open and close the opening.

In addition, the washing machine 1 includes a motor 40 and a transmission unit 50 that transmits the rotational force of the motor 40 to the rotational shaft 21 of the dewatering tank 20, and * that controls the driving of the motor 40. ?* It is equipped with the control device 60.

The motor 40 may be exemplified as a three-phase brushless motor having a rotation angle detector 41 such as a resolver for detecting the rotation angle of the motor 40 and a rotary encoder.

The transmission unit 50 is composed of a pulley mounted on the rotating shaft 21 or a belt that is hung between the pulleys.

The control device 60 is an arithmetic logic operation circuit composed of a CPU, ROM, RAM, backup RAM, and the like. The control device 60 may include at least one processor. An output signal from the rotation angle detector 41 of the motor 40 is input to the control device 60. Then, the control device 60 sets a target current required to supply the motor 40 based on an output signal from the rotation angle detector 41 or the like, and performs feedback control based on the set target current.

In addition, the washing machine 1 is provided with a spring 70 provided between the frame 30a of the case 30 and the water tank 10. It can be illustrated that a plurality of springs 70 are provided.

In addition, the washing machine 1 is provided with a damper 100 as an example of a damping device that is installed between the frame 30a of the case 30 and the water tank 10 to attenuate the vibration of the water tank 10. For example, the washing machine 1 may have four dampers 100 connected between each of the four corners of the bottom of the water tank 10 and the frame 30a of the bottom of the case 30. Further, the washing machine 1 includes, for example, two dampers 100 connected between each of the front and rear sides of the upper portion of the water tank 10 and the frame 30a of the upper left of the case 30, and the water tank ( 10) It may be exemplified that the case 30 has two dampers 100 connected between each of the front side and the rear side of the upper right portion and the frame 30a of the upper right portion of the case 30. Among the eight dampers 100, any one damper 100 may not be provided, and another damper 100 may be provided in addition to the eight dampers 100.

2 is a diagram showing an example of a schematic configuration of the damper 100.

The damper 100 is an example of a supported member having one end supported on the case 30, and a rod-shaped rod having one end supported by the water tank 10 and the other end inserted into the inside of the plunger 110 It has a rod 120 as an example of a shape member. In addition, the damper 100 has a housing 130 covering a part of the plunger 110 and the rod 120. In addition, the damper 100 has a first state in which the rod 120 and the housing 130 are integrated so that the housing 130 is movable with respect to the plunger 110 together with the rod 120, and the rod 120 A switching device 140 is provided as an example of switching means for switching the housing 130 to the separated second state. One end of the plunger 110 may be supported by the water tank 10, and one end of the rod 120 may be supported by the case 30.

The plunger 110 has a cylindrical pipe 111 and a base 112 holding the pipe 111. The base 112 has a pin hole 111a into which a pin (not shown) for connecting the plunger 110 to the water tank 10 is inserted. The pin hole 111a may be illustrated in a cylindrical shape.

The rod 120 has a rod-shaped rod-shaped portion 121 and a base 122 for holding the rod-shaped portion 121.

The rod-shaped portion 121 may be a cylindrical or cylindrical one. The outer diameter of the rod-shaped portion 121 is less than the inner diameter of the pipe 111 of the plunger 110, and the end of the rod-shaped portion 121 on the opposite side to the base 122 is inserted into the pipe 111 of the plunger 110 . The damper 100 expands and contracts by sliding the rod-shaped portion 121 in the pipe 111 of the plunger 110.

Hereinafter, the direction of the center line of the rod-shaped portion 121, that is, the direction of movement of the rod-shaped portion 121 with respect to the plunger 110, the stretching direction of the damper 100 is simply referred to as a "expansion direction". In addition, in the stretching direction, the water tank 10 side is sometimes referred to as "one side" and the case 30 side is referred to as "the other side".

In the rod-shaped portion 121, a concave groove portion 121a is formed at an end portion on the side of the base 122 from the outer peripheral surface. It can be illustrated that the groove portion 121a is formed in a spiral shape. However, the shape of the groove portion 121a is not limited to a spiral. The groove portion 121a may extend in a direction orthogonal to the stretching direction. In some cases, it can be illustrated that a plurality (eg, five) are formed in the stretching direction. In addition, each concave portion 121a may be formed over the entire circumference of the outer circumferential surface of the rod-shaped portion 121, and may be formed in two places at 180° intervals in the circumferential direction.

Further, in the central portion of the rod-shaped portion 121, a protrusion 121b protruding from the outer peripheral surface is provided at a portion on one side of the groove portion 121a. The position and size of the protrusion 121b will be described later.

A pin hole 122a into which a pin (not shown) for connecting the rod 120 to the case 30 is inserted is formed in the base 122. The pin hole 122a may be illustrated in a cylindrical shape.

The housing 130 is an example of a contact body disposed around the pipe 111 so as to contact the outer circumferential surface of the pipe 111 of the plunger 110, and a friction material 131 and a receiving member 133 accommodating the friction material 131 ) And a regulating member 132 that regulates the movement of the friction material 131.

The friction material 131 is a cylindrical member. When the rod 120 is coupled to the housing 130 by the switching device 140, the rod 120 is in contact with the outer circumferential surface of the plunger 110 while the rod 120 is connected to the plunger 110 together with the housing 130. You can move inside. When separated from the rod 120 and the housing 130 by the switching device 140, only the rod 120 can move the inside of the plunger 110.

The material of the friction material 131 is not particularly limited as long as it is a material having excellent wear resistance. For example, the material of the friction material 131 may be a urethane resin or urethane rubber. In addition, the friction material 131 may be made of nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), ethylene propylene rubber (EPDM), styrene butadiene rubber (SBR), and natural rubber (NR). . In addition, the material of the friction material 131 may be a thermosetting resin or a thermoplastic resin. It does not specifically limit as a thermosetting resin, For example, a phenol resin and an epoxy resin can be illustrated. In addition, the thermoplastic resin is not particularly limited, and examples thereof include polyamide resin, polyimide resin, and polycarbonate resin. In addition, the material of the friction material 131 may be metal. Examples of metals include copper and brass.

The receiving member 133 includes a first cylindrical portion 136, a second cylindrical portion 137, and a third cylindrical portion 138, which are three cylindrical portions having different inner diameters and outer diameters, respectively, from one side to the other side in the stretching direction. It is a shape arranged sequentially.

The length of the first cylindrical portion 136 in the stretching direction is longer than that of the friction material 131 in the stretching direction. The diameter of the inner peripheral surface of the first cylindrical portion 136 is smaller than the diameter of the outer peripheral surface of the friction material 131. Further, the first cylindrical portion 136 has a friction material 131 sandwiched between the plunger 110 and the pipe 111. The inner circumferential surface of the friction material 131 is in constant contact with the outer circumferential surface of the pipe 111 and the outer circumferential surface of the friction material 131 always contacts the inner circumferential surface of the first cylindrical portion 136, and the inner circumferential surface of the friction material 131 and the outer circumferential surface of the pipe 111 and The diameter of the inner circumferential surface of the first cylindrical portion 136 and the thickness of the friction member 131 are set so that friction occurs between the outer peripheral surface of the friction member 131 and the inner peripheral surface of the first cylindrical portion 136.

The inner diameter of the second cylindrical upper portion 137 is smaller than the outer diameter of the friction material 131. One end surface of the second cylindrical portion 137 in the stretching direction suppresses the movement of the friction member 131 to the other side. The inner diameter of the second cylindrical upper portion 137 is larger than the outer diameter of the pipe 111 of the plunger 110. The housing 130 is movable relative to the pipe 111.

The inner diameter of the third cylindrical portion 138 is smaller than the inner diameter of the second cylindrical portion 137 and larger than the outer diameter of the rod-shaped portion 121 of the rod 120. The rod-shaped portion 121 of the rod 120 is slidable within the third cylindrical portion 138.

Here, the distance from the center line of the protrusion 121b of the rod-shaped portion 121 of the rod 120 is smaller than the inner circumferential radius of the second cylindrical portion 137 and larger than the inner circumferential radius of the third cylindrical portion 138 . For this reason, while the protrusion 121b of the rod-shaped portion 121 hits one end of the third cylindrical portion 138, movement of the rod 120 to the other side of the housing 130 is suppressed.

The third cylindrical upper portion 138 is formed with a mounting portion 138a on which the switching device 140 is mounted. The mounting portion 138a is provided with a cylindrical portion for slidably supporting the coupling member 150 to be described later of the switching device 140.

The regulating member 132 is mounted on the first cylindrical portion 136 to close an opening at one end of the first cylindrical portion 136 of the receiving member 133. The regulation member 132 may be exemplified that it is fixed to the first cylindrical portion 136 using a fastening member such as a screw. In addition, the regulating member 132 may be fitted into the first cylindrical portion 136 by force fitting. In addition, the regulating member 132 may have a sealing function to suppress the intrusion of foreign substances such as dust into the housing 130.

The switching device 140 has a coupling member 150 having a protrusion 151a coupled to a concave portion 121a formed on the rod 120 and a driving member 160 for moving the coupling member 150. The coupling member 150 may be coupled to the rod 120 so that the housing 130 and the rod 120 are coupled or separated. The driving member 160 may move the coupling member 150 so that the coupling member 150 is coupled to the rod 120 or separated from the rod 120.

The coupling member 150 has a rectangular parallelepiped portion 151 having a rectangular parallelepiped shape and a protrusion 152 protruding from the rectangular parallelepiped portion 151, and moves in a direction orthogonal to the stretching direction.

The rectangular parallelepiped portion 151 has a plurality of protrusions 151a protruding from the side of the rod 120 toward the rod 120 at regular intervals (three in the present embodiment). The protrusion 151a extends in a direction perpendicular to the paper of FIG. 2.

In the rectangular parallelepiped portion 151, the protruding portion 152 is formed on a surface opposite to the surface on which the protruding portion 151a is formed so as to extend in a direction orthogonal to the stretching direction. Hereinafter, the "direction orthogonal to the stretching direction" may be simply referred to as "orthogonal direction".

The driving member 160 may be exemplified as a solenoid actuator that converts electrical energy into mechanical motion using electromagnetic force.

The driving member 160 includes a coil (not shown), a core 161 and an operating rod 162 guided to the core 161. Further, the driving member 160 includes a case 163 accommodating the coil, the core 161 and the operating rod 162, and a coil spring 164 disposed around the case 163.

The operating rod 162 has an end on the side of the coupling member 150 accommodated in the case 163, and an end on the opposite side of the coupling member 150 protrudes from the case 163. In addition, a support member 165 for supporting the end of the coil spring 164 is installed at the end of the operating rod 162 protruding from the case 163. In addition, an end of the operation rod 162 on the coupling member 150 side is fixed to the protrusion 152 of the coupling member 150.

The case 163 is fixed to the housing 130. The case 163 may be exemplified that it is fixed to the third cylindrical portion 138 of the housing 130 by using a fastening member such as bolts or screws. In addition, the case 163 supports the end of the coil spring 164.

The support member 165 may be a disk-shaped member.

3 is a diagram showing an example of a combined state.

In the switching device 140 configured as described above, a voltage is applied to the driving member 160, and current flows through the coil of the driving member 160 through a lead wire (not shown), so that a direction perpendicular to the operating rod 162 Of thrust occurs. Then, the operation rod 162 moves toward the rod 120, and the coupling member 150 fixed to the operation rod 162 moves toward the rod 120. Accordingly, the protrusion 151a of the coupling member 150 is fitted into the concave portion 121a formed in the rod 120. Hereinafter, a state in which the protrusion portion 151a is fitted into the concave portion 121a may be referred to as a “coupled state”. The coupled state is an example of the first state described above.

When the application of voltage to the driving member 160 is stopped, thrust is not generated in the actuating rod 162 so that the actuating rod 162 moves in the opposite direction to the rod 120 by the elastic force of the coil spring 164, and is coupled. The member 150 moves in a direction opposite to the rod 120. For this reason, the protrusion 151a of the coupling member 150 is removed from the concave portion 121a formed in the rod 120 so that the protrusion 151a is not fitted in the concave portion 121a. Hereinafter, a state in which the protrusion portion 151a is not fitted in the concave portion 121a may be referred to as a "release state". 2 shows an example of the canceled state. The release state is an example of the second state described above.

The application of voltage to the driving member 160 is controlled by the control device 60. The control device 60 applies a voltage to the driving member 160 when the rotational speed N of the motor 40 is within a predetermined rotational speed range Nt. Meanwhile, the control device 60 does not apply a voltage to the driving member 160 when the rotational speed N of the motor 40 is outside the predetermined rotational speed range Nt. The control device 60 is an example of determining the rotation speed N of the motor 40 based on the rotation angle of the motor 40 detected by the rotation angle detector 41 such as a resolver mounted on the motor 40 can do. Further, the control device 60 may grasp the rotational speed N of the motor 40 based on the target value of the current supplied to the motor 40.

FIG. 4 is a diagram illustrating an example of a state in which the damper 100 is stretched when in a coupled state, and FIG. 5 is a diagram illustrating an example of a state in which the damper 100 is contracted in a coupled state. FIG. 6 is a view showing an example of a state in which the damper 100 is stretched when in a released state, and FIG. 7 is a diagram illustrating an example of a state in which the damper 100 is contracted in the released state.

In the washing machine 1 configured as described above, the control device 60 applies a voltage to the driving member 160 when the rotation speed N of the motor 40 is within a predetermined rotation speed range Nt. The protrusion 151a of the coupling member 150 of 140 is fitted into the concave portion 121a formed in the rod 120 and is in a coupled state. As shown in FIGS. 4 to 5, in the coupled state, the rod 120 and the housing 130 are integrated to move relative to the plunger 110. That is, while the friction material 131 of the housing 130 and the outer peripheral surface of the plunger 110 are in contact with each other, the housing 130 and the plunger 110 move relatively. Accordingly, a damping force resulting from the frictional force generated between the friction material 131 and the plunger 110 is generated in the damper 100.

The frictional force generated between the friction material 131 and the plunger 110 varies in response to the force that the friction material 131 presses against the outer peripheral surface of the plunger 110 by the first cylindrical portion 136 of the housing 130. In addition, the frictional force varies according to the thickness of the friction material 131, that is, the difference between the outer circumferential radius and the inner circumferential radius of the friction material 131, and the difference between the outer circumferential diameter of the friction material 131 and the inner circumferential diameter of the first cylindrical portion 136. . In addition, the frictional force varies according to the material of the friction material 131. Accordingly, the damping force by the damper 100 varies depending on the difference between the thickness or material of the friction material 131, the outer circumferential diameter of the friction material 131 and the inner circumferential diameter of the first cylindrical portion 136.

In addition, the predetermined rotational speed range Nt is a range including the rotational speed N of the motor 40 at which resonance occurs in the washing machine 1, and may be, for example, 100rpm to 300rpm.

On the other hand, the control device 60 does not apply a voltage to the driving member 160 when the rotational speed N of the motor 40 is outside the predetermined rotational speed range Nt, so the coupling member of the switching device 140 ( The protrusion portion 151a of 150) is in a released state that is not fitted into the groove portion 121a formed in the rod 120. As shown in FIGS. 6 to 7, in the released state, the rod 120 and the housing 130 are not integrated and separated, so that the rod 120 moves relative to the plunger 110, and the housing 130 It does not move with respect to the plunger 110. For this reason, a damping force resulting from the frictional force generated between the friction material 131 and the plunger 110 is not generated in the damper 100. In addition, since the frictional force generated between the plunger 110 and the rod 120 is very small compared to the frictional force generated between the friction material 131 and the plunger 110, the damping force outside the predetermined rotational speed range Nt is small.

8 is a diagram showing an example of the relationship between the rotational speed N of the motor 40 and the vibration of the water tank 10. The solid line represents the vibration of the water tank 10 of the washing machine 1 according to the present embodiment, and the dotted line represents the vibration of the water tank 10 of the washing machine according to the comparative configuration. The washing machine according to the comparative configuration does not include the damper 100 compared to the washing machine 1 according to the present embodiment.

As shown in Fig. 8, when the rotational speed N of the motor 40 is outside the predetermined rotational speed range Nt, the damper 100 is caused by the frictional force generated between the friction material 131 and the plunger 110. Since the damping force is not generated, the vibration of the washing machine 1 according to the present embodiment and the vibration of the washing machine according to the comparative configuration are approximately the same. On the other hand, when the rotational speed (N) of the motor 40 is within the predetermined rotational speed range (Nt), a damping force resulting from the frictional force generated between the friction material 131 and the plunger 110 is generated in the damper 100. The vibration of the washing machine 1 according to the embodiment is smaller than that of the washing machine according to the comparative configuration.

In addition, according to the washing machine 1 according to the present embodiment, for example, a washing machine in which a damping force due to frictional force generated from the friction material 131 is generated outside a predetermined rotational speed range Nt (hereinafter, “a washing machine according to another comparative configuration Compared with "may be referred to as "), the vibration of the water tank 10 outside the predetermined rotational speed range Nt becomes difficult to be transmitted to the case 30. Accordingly, vibrations outside the predetermined rotational speed range Nt of the case 30 are smaller in the washing machine 1 according to the present embodiment than in the washing machine according to other comparative configurations.

And, if the vibration of the washing machine 1 according to the present embodiment is smaller than the vibration of the washing machine according to the comparative configuration or the washing machine according to another comparative configuration, the case 30 of the washing machine 1 or the floor on which the washing machine 1 is installed The vibration of is also smaller. In addition, noise due to vibration is also reduced.

Therefore, according to the washing machine 1 according to the present embodiment, interference between the water tank 10 and the iron plate 30b of the case 30 is suppressed by the vibration of the water tank 10 and the case 30. In addition, even if vibration occurs, since the distance between the water tank 10 and the iron plate 30b of the case 30 is not smaller than that of a washing machine according to a comparative configuration or a washing machine according to another comparative configuration, the size of the case 30 is the same. In this, the size of the tank 10 can be increased. As a result, according to the washing machine 1 according to the present embodiment, it is possible to increase the washing capacity without increasing the size of the outer shape formed by using the outer surface of the case 30.

Further, according to the damper 100 according to the present embodiment, the above-described effect can be exhibited without complicating the configuration. That is, in the damper 100, a friction material 131 is provided inside the housing 130 covering the periphery of the plunger 110 or the rod 120 to generate a friction force between the outer circumferential surface of the plunger 110 Configuration. Therefore, the configuration of the damper 100 is, for example, a simple configuration compared to a configuration in which a member having a friction material mounted thereon is further provided in the plunger 110 or the rod 120. In addition, for example, it is a simpler configuration compared to a configuration in which a member having a friction material mounted between the housing 130 and the plunger 110 or the rod 120 is provided separately from the housing 130.

In addition, according to the damper 100 according to the present embodiment, when the size of the friction material 131 is the same, the friction material 131 and the plunger 110 are changed by changing the inner circumferential diameter of the first cylindrical portion 136 of the housing 130. ) It is possible to change the frictional force between the outer circumferential surfaces, and further, the damping force of the damper 100. Therefore, when it is desired to change the damping force according to the model of the washing machine, for example, it can be changed only by changing the inner circumferential diameter of the first cylindrical portion 136 of the housing 130 without changing the size of the friction material 131. .

In addition, in the damper 100 according to the present embodiment, the rod 120 and the friction material are coupled with the protrusion 151a of the coupling member 150 from the outside to the concave portion 121a formed on the outer circumferential surface of the rod 120 The housing 130 with 131 is integrated. Further, moving the coupling member 150 to couple the protrusion 151a to the concave portion 121a is made in a direction orthogonal to the stretching direction. Therefore, for example, in order to integrate the rod 120 and the member having the friction material 131 (the housing 130 in the damper 100), the structure is simpler than the configuration in which the member having the friction material 131 is rotated. .

In addition, moving the coupling member 150 is a direction orthogonal to the stretching direction. In addition, generating a friction force between the friction material 131 and the outer circumferential surface of the plunger 110 is the force of pressing the friction material 131 to the plunger 110, and the inner circumferential surface of the first cylindrical portion 136 of the housing 130 The drive member 160 is not created to determine by the diameter. That is, the driving member 160 only needs to generate a force capable of causing the coupling or release of the protrusion 151a of the coupling member 150 to the concave portion 121a formed on the outer peripheral surface of the rod 120. For example, instead of integrating the rod 120 and the housing 130 using the coupling member 150, a friction material is pushed on the outer circumferential surface of the rod 120, and the friction force generated between the friction material and the outer circumferential surface of the rod 120 A configuration in which the rod 120 and the housing 130 are integrated (hereinafter referred to as “second comparison configuration”) may be considered. In the case of the second comparative configuration, in order to generate the friction force required to move and integrate the friction material in a perpendicular direction using the driving member 160, it is necessary to increase the electromagnetic force of the driving member 160. (161) It is necessary to enlarge. Accordingly, according to the damper 100 according to the present embodiment, it becomes possible to use a small solenoid actuator as the driving member 160. Since this solenoid actuator has good responsiveness and can instantly switch between the engaged state and the disengaged state, it becomes possible to change the damping force with high accuracy in accordance with the rotational speed N of the motor 40. In addition, in the case of the second comparative configuration, if it is desired to change the damping force according to the model of the washing machine, it is necessary to change the electromagnetic force of the driving member 160, and if the damping force is to be increased, the driving member 160 must be increased. In contrast, according to the damper 100 according to the present embodiment, it is possible to change the damping force only by changing the inner peripheral surface diameter of the first cylindrical portion 136 of the housing 130.

In addition, when a voltage is applied to the driving member 160 in order to be engaged, the position of the protrusion portion 151a of the coupling member 150 and the position of the concave portion 121a of the rod 120 do not match, so that the protrusion portion 151a ) Is in contact with the outer circumferential surface of the rod 120, since the washing machine 1 vibrates when a voltage is applied to the driving member 160, the rod 120 moves with respect to the coupling member 150 to move the protrusion 151a. ) And the groove portion (121a) is coupled. Therefore, according to the damper 100 according to the present embodiment, a high-accuracy coupling state can be achieved at a desired timing. The moving direction of the coupling member 150 may not be a direction orthogonal to the stretching direction. For example, the moving direction of the coupling member 150 may be a stretch direction and a direction inclined to a direction orthogonal to the stretch direction.

In addition, since the damper 100 according to the present embodiment is configured to generate a damping force by using the friction force by the friction material 131, for example, whether or not the damping force is generated using MR fluid (magnetic viscous fluid) is determined. It is a smaller configuration than the damper to change. That is, while the damper using the MR fluid is enlarged to the extent necessary to fill the MR fluid, according to the damper 100 according to the present embodiment, it is not necessary to fill a fluid such as MR fluid, and thus can be made compact. In addition, in a damper that generates a damping force using MR fluid, design changes such as changing the amount of the MR fluid are required when changing the damping force according to the model of the washing machine. On the other hand, according to the damper 100 according to the present embodiment, since the damping force can be changed only by changing the inner circumferential diameter of the first cylindrical portion 136 of the housing 130, it is possible to simply change the damping force.

Further, as described above, according to the damper 100 according to the present embodiment, it is possible to reduce the vibration of the water tank 10 even with a simple configuration. This is not only to provide a damper 100 between the lower portion of the water tank 10 and the bottom of the case 30, but also the damper 100 between the upper portion of the water tank 10 and the left and right ends of the case 30. This is also because the water tank 10 is in an engaged state even at a rotational speed N that resonates in the left-right direction of the water tank 10.

9 is a view for explaining the position of the protrusion 121b provided on the rod-shaped portion 121 of the rod 120 *?*.

The protrusion 121b provided on the rod 120 is an example of the support end supported by the water tank 10, and the distance in the extension direction from the center of the hole of the pin hole 122a formed in the base 122 to the end of one side of the housing 130 (Lh) is provided at a position smaller than the distance Lr from the center of the hole of the pin hole 122a to the tip end of the rod 120.

This is due to the following reasons. That is, in a state in which the rod 120 and the housing 130 are integrated and the end of one side of the housing 130 hits the base 112 of the plunger 110, the switching device 140 may be damaged. That is, in the case of the coupled state, when the damper 100 strokes largely due to resonance and the end of one side of the housing 130 hits the base 112 of the plunger 110, the impact force upon hitting the switch device ( 140) and can be damaged. According to the damper 100 according to the present embodiment, since the protrusion 121b provided on the rod 120 is provided at a position where the distance Lh is smaller than the distance Lr, when the damper 100 is contracted, the rod 120 ) Hits the base 112 of the plunger 110. Accordingly, damage to the switching device 140 by hitting the base 112 of the plunger 110 at one end of the housing 130 is suppressed.

That is, when the damper 100 is retracted, the protrusion 121b is the damper 100 is elongated to prevent damage from the end of the housing 130 hitting the base 112 of the plunger 110, and the protrusion 121b When) is hung on the third cylindrical portion 138, the end of the rod 120 may be positioned closer to the base 112 of the plunger 110 than the end of the housing 130.

In the above-described embodiment, the damper 100 is applied to the washing machine 1 so that one end of the plunger 110 supports the member on either side of the case 30 or the water tank 10, and the one end of the rod 120 is Although provided so as to support the member on the other side of the case 30 or the water tank 10, it is not particularly limited to this type. The damper 100 may be provided between any two relatively moving members. That is, one end of the plunger 110 supports one of the two members that move relatively, and one end of the rod 120 supports the other member of the two members, and the other end is inside the plunger 110. It can also be arranged to be inserted.

1 ... washing machine
10 ... fish tank
20 ... dewatering tank
30 ... case
100 ... damper
110 ... plunger
120 ... load
121a ... concave
121b ... protrusion
130 ... housing
131 ... friction material
140 ... switching device
150 ... coupling member
151a ... protrusion
160 ... drive member

Claims (20)

case;
A water tank provided inside the case and provided with a dewatering tank rotatably mounted therein; And
Includes; a damper installed between the case and the water tank to attenuate the vibration of the water tank,
The damper,
A plunger having one end supported by the case;
A rod having one end supported by the water tank and the other end movably inserted into the plunger;
A housing provided to surround an outer peripheral surface of the plunger and a portion of the rod, and including a friction material provided between the plunger and contacting the outer peripheral surface of the plunger; And
A first state in which the rod is coupled to the housing so that the friction material can move inside the plunger together with the housing while the friction material is in contact with the outer circumferential surface of the plunger, and the rod is separated from the housing so that only the rod is inside the plunger. A switching device having a second state to enable movement of the device;
Washing machine comprising a. The method of claim 1,
The switching device is a washing machine comprising a coupling member coupled to the rod to couple the housing and the rod, and a driving member to move the coupling member so that the coupling member is coupled to the rod or separated from the rod. The method of claim 2,
The coupling member is a washing machine comprising a rectangular parallelepiped-shaped portion having a rectangular parallelepiped shape, a protruding portion protruding from the rectangular parallelepiped-shaped portion, and a plurality of protruding portions protruding from the rectangular parallelepiped-shaped portion toward the rod. The method of claim 3,
The driving member has a case fixed to the housing, one end is accommodated in the case and fixed to the protrusion, and the other end is provided so as to protrude out of the case to move the coupling member, and the other end of the operating rod A washing machine comprising a supporting member to be installed, and a coil spring having one end supported by the case and the other end supported by the supporting member. The method of claim 4,
When a voltage is applied to the driving member and thrust is generated in the actuating rod, the coupling member is moved in a direction toward the rod by the actuating rod, and the plurality of protrusions are coupled to the rod, so that the housing and the rod Washing machine to ensure that it is combined. The method of claim 5,
When the damper is expanded and contracted in a state in which the housing and the rod are coupled, the rod and the housing are moved together with respect to the plunger, so that the damping force of the damper is increased by the frictional force generated between the friction material and the outer circumferential surface of the plunger. washer. The method of claim 6,
When the application of voltage to the driving member is stopped, the actuating rod is moved in a direction opposite to the direction toward the rod by the elastic force of the coil spring, and the plurality of protrusions are separated from the rod and the A washing machine in which the housing and the rod are separated. The method of claim 7,
When the damper is expanded and contracted while the housing and the rod are separated, only the rod is moved relative to the plunger to generate a friction force between the plunger and the rod, and the friction force generated between the plunger and the rod is the friction material. And the frictional force generated between the plunger and the outer circumferential surface of the plunger, so that the damping force of the damper is smaller than when the housing and the rod are coupled. The method of claim 1,
The plunger is a washing machine comprising a cylindrical pipe into which the rod is inserted, and a base provided on one side of the pipe and supported by the water tank. The method of claim 3,
The rod is a washing machine including a rod-shaped portion inserted into the plunger, and a base provided on one side of the rod-shaped portion and supported by the case. The method of claim 10,
The rod-shaped portion is formed to be concave on the outer circumferential surface of the rod-shaped portion, the washing machine comprising a plurality of grooves to which the plurality of protrusions are fitted and coupled. The method of claim 1,
The housing is a washing machine comprising a receiving member that surrounds an outer circumferential surface of a portion of the plunger and the rod to receive the friction material, and a regulating member provided at one end of the receiving member to regulate movement of the friction material. The method of claim 12,
The receiving member is provided to have an inner diameter smaller than the outer diameter of the friction member and the regulating member is mounted so that the friction member has an inner diameter smaller than the inner diameter of the first cylindrical portion and the first cylindrical portion to be accommodated by being sandwiched between the plunger. A third provided to have an inner diameter smaller than an inner diameter of the second cylindrical portion and larger than an outer diameter of the rod, and a second cylindrical portion for inhibiting the friction material from moving in the opposite direction of the regulating member, and a third configured to allow the rod to slide. Washing machine comprising a cylindrical portion. The method of claim 13,
The rod is provided to protrude from the outer circumferential surface of the rod, and when the damper is stretched, the washing machine comprises a protruding portion that is caught on the third cylindrical portion and restricts movement of the rod. The method of claim 14,
When the protrusion is retracted, the damper is elongated to prevent damage from hitting the plunger base when the damper is contracted, so that when the protrusion is hung on the third cylindrical portion, the end of the rod is A washing machine provided at a position that can be positioned closer to the base of the plunger than the end of the housing. A plunger whose one end is supported by one of the two relatively moving members;
A rod having one end supported by the other member of the two members and the other end movably inserted into the plunger;
A housing provided to surround an outer peripheral surface of the plunger and a portion of the rod, and including a friction material provided between the plunger and contacting the outer peripheral surface of the plunger; And
A first state in which the rod is coupled to the housing so that the friction material can move inside the plunger together with the housing while the friction material is in contact with the outer circumferential surface of the plunger, and the rod is separated from the housing so that only the rod is inside the plunger. A switching device having a second state to enable movement of the device;
A damper comprising a. The method of claim 16,
The switching device includes a coupling member coupled to the rod to allow the housing and the rod to be coupled, and a driving member for moving the coupling member so that the coupling member is coupled to the rod or separated from the rod. The method of claim 17,
The coupling member includes a rectangular parallelepiped-shaped portion, a protruding portion protruding from the rectangular parallelepiped-shaped portion, and a plurality of protrusions protruding from the rectangular parallelepiped portion toward the rod to be coupled to or separated from the rod. Damper. The method of claim 18,
The driving member has a case fixed to the housing, one end is accommodated in the case and fixed to the protrusion, and the other end is provided so as to protrude out of the case to move the coupling member, and the other end of the operating rod A damper comprising a supporting member to be installed, and a coil spring having one end supported by the case and the other end supported by the supporting member. A plunger whose one end is supported by a member of one of the two relatively moving members;
A rod having one end supported by the other member of the two members and the other end movably inserted into the plunger;
A housing provided to surround an outer peripheral surface of the plunger and a portion of the rod, and including a friction material provided between the plunger and contacting the outer peripheral surface of the plunger; And
A switching device for switching a state such that the rod is coupled to the housing or disconnected from the housing so that a damping force due to frictional force generated when the rod moves inside the plunger is switched;
A damper comprising a.

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