KR20130002829A - A continuous damping device for vibration mitigation of a wasihing machine - Google Patents

Abstract

PURPOSE: A washing machine and a continuous damping device for vibration reduction of the washing machine are provided to minimize the impact caused by transition of a discontinuous damping force in a two step damping device. CONSTITUTION: A body(100) flows corresponding to an axis direction. A support rod(400) is penetrated into the body. The support rod is fixed to a cabinet. A pair of first repulsive members(230a,230b) are fixed on an upper side and a lower side of a buffer space(123) in the body. A second repulsive member(210) receives a repulsive force of a different direction from a pair of first repulsive members.

Description

Technical Field [0001] The present invention relates to a continuous damping device for vibration reduction of a washing machine and a washing machine using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a continuous damping device for vibration reduction of a washing machine, and more particularly to a continuously damping device for continuously absorbing vibrations generated from an outer tub of a washing machine, by preventing sudden transition from low damping to high damping The present invention relates to a continuous damping device for vibration reduction of a washing machine and a washing machine using the same, which prevents generation of noise due to a discontinuous change in damping force.

Generally, a washing machine is a device for washing and dewatering a certain amount of laundry to be washed.

Such a washing machine has a method of charging laundry from the upper part of the case and a drum method of charging the laundry from the side.

In the case of the former, the washing machine has an inner tub connected to a rotating motor at a lower end thereof in the case, and an laundry tub is inserted and stored from the upper part. An outer tub surrounding the inner tub is installed on the outer side of the inner tub.

Generally, a support bar of a certain length is provided on the side of the outer tub of the washing machine. The upper end of the support rod is fixed to the upper end of the case and the lower end passes through the vibration member connected to the outer circumference of the outer tub. The lower end of the penetrating support rod and the vibrating member are elastically supported by a spring.

Accordingly, when vibration is generated in the outer tub, the vibration is transmitted to the vibration member, and the vibration member is lifted along the support bar, thereby absorbing the overall balance and vibration.

However, since the conventional vibration member absorbs the vibration by using the spring itself, there is a problem that the vibration member can not be sequentially operated according to various levels of vibration.

That is, although the outer tub is absorbed by the spring and the vibration member at a plurality of positions on the outer circumference thereof, the outer tub moves upward and downward even when minute vibration is generated without considering the level of vibration, .

Accordingly, in recent years, as described above, the vibration generated in the outer tub is sequentially absorbed according to the level of the vibration, and in the process of absorbing the vibration, the noise of the suspension device is reduced to the utmost, do.

However, in the above-described sequential suspension device, there is a discontinuous change point of the damping force in the process of shifting the damping force from high damping to low damping, resulting in a noise due to the impact sound.

In addition, due to the discontinuous change in the damping force, an impulse noise is generated, which is similar to the case where a structural noise is generated in a tub or a cabinet.

It is another object of the present invention to provide a vibration reduction device for a washing machine capable of minimizing impact and noise generated when vibration generated in a tub of a washing machine is absorbed, And to provide a continuous damping device.

In order to achieve the above-mentioned object, the present invention will be realized by an embodiment having the following constitution as a preferred embodiment.

According to an embodiment of the present invention, there is provided a washing machine comprising: a body connected to a tub of a washing machine and having a buffer space formed therein; A support rod penetrating the body so that the body can flow along the axial direction; A pair of first resilience members fixedly installed above and below the buffer space of the body; A second repulsion member disposed in the buffer space and having a damping effect with a first repulsion member and a repulsive force; And a friction member which is in close contact with the outer circumference of the second repulsive member and the support rod to form a frictional force. The present invention also provides a continuous damping device for vibration reduction of a washing machine.

Here, the first and second repulsive members may be formed of a first magnetic body and a second magnetic body, and may have a repulsive force by opposing each other with the same polarity. Preferably, the magnetic bodies are formed of permanent magnets .

Particularly, since the second magnetic bodies are disposed between the pair of first magnetic bodies at a predetermined interval, the repulsive forces of the first and second magnetic bodies at the upper and lower portions change according to the separation distance. Thus, The buffering effect can be achieved by the repulsive force varying according to the separation distance.

In other words, when the distance between the poles of the same magnetic body is spaced apart from each other, the repulsive force is further increased. When the distance between the magnetic poles is narrowed, the magnetic force becomes larger as inversely proportional to the square of the separation distance. . Therefore, when the vertical vibration is generated, when the distance between the upper and lower first magnetic bodies is narrowed, a larger repulsive force is obtained, so that a continuous buffering effect without discontinuity can be achieved.

The body is formed of a cylindrical cylinder, and the first magnetic body is formed in a ring shape so as to penetrate the support rod, and the second magnetic body is annularly formed so as to be closely fixed to the outer circumference of the support rod with the friction member therebetween. .

And the second magnetic body exists between the upper first magnetic body and the lower first magnetic body in the buffer space. Further, the annular second magnetic body may further include a second magnetic body accommodating portion formed in a cylindrical shape on its outer periphery, and a noise absorbing pad having a predetermined thickness may be further formed on the upper end surface and the lower end surface of the accommodating portion.

The maximum repulsive force of the first magnetic body and the second magnetic body is greater than the frictional force of the friction member, thereby preventing the first magnetic body and the second magnetic body from being damaged in the damping process. As a result, the repulsive force at the most recent contact point of the first magnetic body and the second magnetic body reaches the maximum value, so that the repulsive force at the most recent contact point is preferably larger than the static frictional force caused by the friction member.

According to another embodiment of the present invention, there is provided a washing machine comprising: a body connected to a tub of a washing machine and having a buffer space formed therein; An air cap covering an upper portion of the body; A support rod penetrating the body and the air cap to allow the body to flow along the axial direction; An elastic member externally supporting the support rod and elastically supporting the body; A pair of first resilience members fixedly installed above and below the buffer space of the body; A second repulsion member disposed in the buffer space and having a damping effect with a first repulsion member and a repulsive force; And a friction member which is in close contact with the outer circumference of the second rebound member and the support rod to form a frictional force.

Further, the present invention can be applied not only to a washing machine but also to a general suspension device (shock absorber) for absorbing vibrations. The present invention includes a body having a buffer space formed therein; A pair of first magnetic bodies fixedly installed at upper and lower portions in the buffer space; A second magnetic body disposed between the first magnetic bodies inside the buffer space and having a damping effect with a repulsive force continuously changing in accordance with a distance from the first magnetic body; A support rod fixedly supported by the second magnetic body and allowing the body to flow in an axial direction; And a friction member which is in close contact with a fixed portion between the second magnetic body and the support rod and has a frictional force, thereby continuously reducing the vibration.

According to another embodiment of the present invention, there is provided a shock damping device for a vibration damping continuous damping structure, comprising a bumper member for mitigating an impact upon collision of a first magnetic body and a second magnetic body in a continuous damping structure.

The bumper member may be fixed to the upper and lower portions of the buffer space, or may be installed in the second magnetic body.

In addition, the bumper member may further include a noise absorbing pad at a collision portion between the first magnetic body and the second magnetic body.

According to another embodiment of the present invention, a cabinet; An outer tub and an inner tub having an upper opening; A rotating device for rotating the inner tub; And a suspension connected to the outer tub to reduce vibrations, the suspension comprising: a body having a buffer space therein; An air cap covering an upper portion of the body; A support rod penetrating the body and the air cap; An elastic member externally supporting the support rod and elastically supporting the body; A first magnetic body fixedly installed above and below the buffer space of the body; A second magnetic body disposed in the buffer space and having a damping effect with the first magnetic body and a repulsive force; And a friction member which is in close contact with the outer circumference of the second magnetic body and the support rod to form a frictional force, and has a continuous damping structure with a repulsive force change according to a distance of the magnetic body.

INDUSTRIAL APPLICABILITY As described above, the present invention can achieve the following effects according to the above-described problem solving means and the construction and operation to be described later.

The present invention minimizes the impact due to sudden discontinuous damping force transients in a two-stage damping device that sequentially absorbs vibrations generated in the tub of a washing machine, and removes noise caused thereby, thereby achieving a continuous damping structure have.

The present invention can prevent the rebounding member or the magnetic body in the buffer space from colliding with each other and being damaged in the continuous damping process including the buffer bumper member.

Accordingly, the present invention can improve the durability of the washing machine by eliminating the noise caused by the two-stage damping in the washing machine suspension device, thereby improving the comfort of use and preventing the breakage of the magnetic body having the continuous damping function in the buffer space.

1 is a sectional view showing an example of a washing machine to which a suspension device is applied;
2 is a graph showing generation of an impact sound due to damping force discontinuity in a conventional suspension device.
3 is a cross-sectional view of a continuous damping device for vibration reduction of a washing machine according to the present invention.
4 is a cross-sectional detail view illustrating a continuous damping operation utilizing a magnetic body of a cushioning space in an embodiment of the present invention;
5 is a detailed cross-sectional view illustrating a cushioning space according to another embodiment of the present invention;
6 to 8 are cross-sectional detail views illustrating a bumper member installed in accordance with various embodiments of the present invention;

Hereinafter, preferred embodiments of a continuous damping device for vibration reduction of a washing machine and a washing machine using the same according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as being limited to ordinary or dictionary terms, and the inventor should appropriately define the concept of the term to describe its invention in the best way The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Prior to the description of the present invention, the occurrence of a damping force discontinuity change according to a two-stage damping process in a conventional washing machine will be described with reference to FIG. 1 and FIG.

1 is a sectional view showing an example in which a suspension device is applied in a washing machine. The washing machine 1 includes an outer tub 30 and an inner tub 20 which form a washing tub in a cabinet 10, And a rotating device 40, which is a motor for rotating the tub, is provided.

The suspension device (2) for buffering the vibration of the washing machine can be employed in the washing machine (1) for inputting the laundry through the upper part. The washing machine 1 has an inner tub 20 whose upper end is opened and whose lower end center is connected to a rotating device 40 such as a motor and rotated by the operation of the rotating device 40, And an outer tub 30 surrounding the outer side of the outer tub 20. The rotating device 40 is positioned below the outer tub 30 and the axis of the rotating device 40 penetrates the lower end of the outer tub 30 and is connected to the bottom center of the inner tub 20.

Here, the inner tub 20 is a container in which laundry is loaded and loaded from the upper part to perform washing and dehydration.

Generally, the suspension device 2 of the washing machine is connected to a plurality of parts of the outer tub 30, absorbs vibration generated due to rotation of the inner tub 20, absorbs vibration, And has a function of reducing noise.

Accordingly, the configuration of the suspension device 2 is realized by the two-stage damping action by the first friction member and the second friction member, in which the support rod 400 is frictionally different from the body of the suspension device.

FIG. 2 is a graph showing generation of an impact sound due to damping force discontinuity in a conventional suspension device. When a sudden transition from low damping to high damping occurs in the two-step damping process, Noise is generated.

As shown in FIG. 2, in the suspension system of the conventional two-stage damping structure, the second damping section corresponding to the frictional force of the second friction member in the first damping section corresponding to the frictional force of the first friction member is a damping force discontinuity point And noise is generated due to the impact sound due to the discontinuous change in the damping force.

Therefore, in the present invention, the damping force discontinuity point is minimized in the two-stage damping structure to prevent noise from being generated due to an impact.

Hereinafter, a continuous damping device for vibration reduction of a washing machine and a washing machine using the same according to the present invention will be described with reference to the accompanying drawings.

3 and 4, a continuous damping device for vibration reduction of a washing machine according to the present invention is connected to the tubs 20 and 30 of a washing machine 1, and a buffer space 123 is formed therein A body 100; A support rod 400 penetrating the body to allow the body to flow along the axial direction; A pair of first resilience members (230a, 230b) fixedly installed above and below the cushioning space of the body; A second bounce member 210 disposed in the buffer space and having a damping effect with a first bounce member and a repulsive force; And a friction member (310) which is in close contact with the outer circumference of the second rebound member and the support rod to form a frictional force.

The body 100 is connected to a plurality of positions of the outer tub 30 of the washing machine and the supporting rod 400 penetrates the body 100 and has one end fixed to the upper end of the case 10 of the washing machine 1 And the other end is projected to the lower end of the apparatus body 100.

The body 100 has a first through hole 121 and a second through hole 122 through which the support rod 400 penetrates. The first through hole 121 is formed in the body 100 And an air cap 110 covering the upper part of the buffer space 123. The second through hole 122 is formed to penetrate the support rod 400 at the bottom of the buffer space of the body 100. The outer circumference 120 of the buffer space formed by a cylindrical case is formed on the outer circumference of the buffer space 123 inside the body.

In the cushioning space 123, a two-step damping operation is implemented. The first damping operation allows continuous damping by the first and second reaction members (magnetic bodies) included therein. In the second damping operation, So that damping by the friction member 310 can be realized naturally in the continuous damping by the magnetic body.

The air cap 110 has a shape gradually becoming narrower along the upper end to the lower end and covers the upper part of the cushioning space 123. On the lower surface of the air cap 110 which is the upper surface of the cushioning space, The first magnetic body 230a as a repulsive member is annularly fixed. On the bottom surface of the buffer space, a second magnetic body 230b, which is a second repulsive member, is also annularly fixed.

The outer diameter of the buffer space 120 is smaller than the diameter of the lower end of the air cap 110 so that a tuck is formed between the lower end of the air cap 110 and the upper end of the buffer space outer circumference 120. In addition, the air cap 110 and the outer circumference 120 of the buffer space may be integrated with each other or may be detachably installed. In the latter case, the air cap 110 and the buffer space outer circumference 120 may be coupled to each other in the same manner as a screw connection. Molon, other hook coupling schemes, etc. may be employed.

A disk-shaped support plate 410 is installed at an end or an end of the support rod 400 disposed through the first and second through holes 121 and 122 of the body 100.

An elastic member 500 such as a spring having a certain elastic force is provided between the lower edge of the air cap 110 and the upper end of the support plate 410. The elastic member 500 is supported by the support rod 400, As shown in Fig. Therefore, the elastic member 500 can elastically support the body 100, which can be moved along the support rod 400, with respect to the support plate 410.

A pair of first bounce members 230a and 230b fixedly installed on the upper and lower portions of the buffer space 123; A second bounce member 210 disposed in the buffer space and having a damping effect with a first bounce member and a repulsive force is provided in a cylindrical shape.

The first repulsive members 230a and 230b and the second repulsive member 210 are formed of a first magnetic body and a second magnetic body, and are spaced apart from each other by a predetermined distance. The second magnetic body 210 is located between the upper first magnetic body 230a and the lower first magnetic body 230b in the buffer space, so that the second magnetic body 210 can smoothly and continuously perform the damping function with a buffer function corresponding to the upper and lower repulsive forces .

Particularly, the first and second magnetic bodies 230a and 230b and the second magnetic body 210 may be made of an electromagnet or a magnetized object, preferably a permanent magnet. The repulsive members are formed of the permanent magnets, so that the continuous damping function can be faithfully performed after the magnetic reluctance is installed.

For example, if the upper first magnetic body 230a has the N pole downward, the upper surface of the corresponding second magnetic body 210 should also have an N pole, and the lower surface of the second magnetic body 210 has an S pole The lower first magnetic body 230b corresponding to the lower first magnetic body 230b should have the S pole upward.

3, the body 100 is formed of a cylindrical cylinder. Therefore, the first magnetic bodies 230a and 230b are annularly formed to penetrate the support rod 400, and the second magnetic body 210, Is formed in an annular shape so as to be closely fixed to the outer periphery of the support rod (400) with the friction member (310) interposed therebetween.

The friction member 310 is in close contact with the outer circumference of the second magnetic body 210, which is the second bounce member, and the support rod 400 to form a frictional force. The friction member 310 is typically made of nonwoven fabric or the like. Since the inner circumference of the friction member 310 is pressed and inserted between the second magnetic body 210 and the support rod 400 so as to be in close contact with the outer circumference of the support rod 400, .

The inner diameter of the annular first magnetic body 210 is formed to be slightly larger than the outer diameter of the support rod 400. The second magnetic body 210 is fitted to the support rod 400 by sandwiching and pressing the friction member 310 made of a material such as a nonwoven fabric or a pallet so that the thickness and material of the friction member 310 and the support rod The second damping function between the second magnetic body 210 and the support rod 400 is realized.

According to another embodiment of the present invention, as shown in FIG. 5, a cylindrical second magnetic body accommodating portion 220 may be further included in the outer periphery of the annular second magnetic body 210. The second magnetic body accommodating part 220 firmly fixes the second magnetic body 210 on the outer periphery of the support rod 400, and can perform a secondary damping function smoothly.

5 and 8, the second magnetic body accommodating part 310 has a hollow shape, and the second magnetic body accommodating part 310 has the second magnetic body 210 inserted therein, It may be cylindrical in shape to be fixed.

Although not shown in the drawing, the second magnetic body accommodating portion 310 includes a plurality of fixing protrusions, which are partially inserted into the first magnetic body 210 to fix the first magnetic body 210, And the fixing protrusions may have a sharp end.

Although not shown in FIG. 5, a sound absorbing pad having a predetermined thickness may be further formed on the outer circumferential surface, the upper surface, and the lower surface of the receiving portion 220 in FIG. A noise may be generated when the second magnetic body 210 is twisted in the second damping step according to the repulsive force of the second magnetic body 210 and collides with the outer circumference 120 of the buffer space. .

In the present invention, the first magnetic bodies 230a and 230b and the second magnetic body 210 may strike during the primary damping action in the buffer space 123. If the magnetic body is formed of a permanent magnet, it may be broken or broken . Therefore, in the present invention, the maximum repulsive force of the first and second magnetic bodies 230a and 230b and the second magnetic body 210 is greater than the frictional force of the friction member 310.

That is, since the repulsive force at the nearest point of the first magnetic body 230a, 230b and the second magnetic body 210 usually has the maximum repulsive force value, the repulsive force of the first magnetic body 230a, So that the magnetic body and the second magnetic body are connected by the second damping without colliding with each other.

The repulsive force of the first magnetic body 230a and the second magnetic body 210 has a maximum value when the repulsive force of the first magnetic body 230a and the second magnetic body 210 are normally closest to each other according to a physical law inversely proportional to the square of the separation distance. However, since the magnetic bodies may collide with each other if they have a maximum value in a state where they are actually in contact with each other, the maximum repulsive force is calculated by assuming a minimum separation distance of a predetermined distance in order to prevent this.

Preferably, an unspecified vibration force due to the up-and-down vibration is applied, and the repulsive force may not necessarily be applied in the normal direction but may be distorted. Therefore, the repulsive force maximum value should be calculated while maintaining a certain distance. Thereby naturally transitioning to a secondary damping phase (high damping phase due to frictional force) at the nearest distance of separation having the maximum repulsive force.

As a result, the maximum value of the repulsive force is calculated based on the error range and the stable range through various experiments to calculate the value at the closest distance between the first magnetic body and the second magnetic body.

6 to 8, another embodiment of the present invention may further include a bumper member for mitigating an impact upon collision of the first magnetic body and the second magnetic body in the buffer space. The bumper member is preferably formed of a cushioning member capable of absorbing impact and preventing noise. Accordingly, when the first magnetic body and the second magnetic body are made of permanent magnets, the risk of breakage at the time of collision can be prevented, and the durability can be improved.

As shown in FIG. 6, the bumper members 235a and 235b may be fixedly installed at the upper and lower portions of the buffer space. Preferably, the bumper members 235a and 235b may be fixed to the first and second magnetic bodies 230a, and 230b. That is, the bumper members 235a and 235b may be formed in an annular shape having a diameter corresponding to the outer diameter and the inner diameter of the first magnetic body, respectively, and may be provided on the inner and outer diameters of the first magnetic body, respectively.

7, the bumper member 215 is installed on the second magnetic body 210, preferably on the end of the second magnetic body 210 so as not to block the section where the magnetic force is formed . At this time, the bumper members 215 are annularly installed on the upper and lower sides of the second magnetic body 210 to prevent direct bumping against the first magnetic bodies 230a and 230b, thereby improving the durability and preventing the generation of noise.

Furthermore, although not shown in the drawings, the bumper member may further include a noise absorbing pad at a collision portion between the first magnetic body and the second magnetic body so as to prevent noise generated in the collision.

The noise absorbing pad as described above may be formed of a nonwoven fabric or a pallet member to have a slight buffer effect, but the main function is to absorb the noise due to the collision.

As shown in FIG. 8, the bumper members 225 are installed on the upper and lower end surfaces of the second magnetic body accommodating portion 220, respectively, to prevent the first magnetic body and the second magnetic body from colliding with each other, thereby improving durability. Accordingly, the bumper member 225 should be formed in an annular shape having a larger diameter than the outer periphery of the supporting rod, like the receiving portion 220.

The present invention provides a suspension for vibration reduction of a washing machine through a continuous damping device for vibration reduction of the washing machine. Accordingly, the washing machine suspension device realized by the continuous damping device of the present invention includes the support rod 400 and the elastic member 500 for elastically supporting the body 100. That is, it is preferable that the continuous damping apparatus for washing machine of the present invention is utilized in a suspension apparatus having a two-stage damping function.

However, the continuous damping device of the present invention as well as the suspension of the washing machine may be utilized in all fields of the shock absorber having the two-stage damping structure.

That is, a body 100 having a buffer space formed therein; A pair of first magnetic bodies 230a and 230b fixedly installed at upper and lower portions of the buffer space; A second magnetic body (210) disposed between the first magnetic bodies in the buffer space and having a damping effect with a repulsive force continuously changing in accordance with a distance from the first magnetic body; And a support rod (400) fixedly supported by the second magnetic body and allowing the body to move in the axial direction. The first and second damping forces So as to minimize the discontinuity of the signal.

In the first damping step of the present invention, a low damping interval is naturally formed by the repulsive force according to the distance between the first magnetic body and the second magnetic body, and when the repulsive force is maximized at the nearest distance, The friction member 310 moves to a second damping stage through the frictional force of the friction member 310 closely attached to the fixed portion between the magnetic body 210 and the support rod 400. [ Thus, sudden transition from the first damping stage to the second damping stage is prevented, thereby minimizing the generation of impact noise.

The configuration for minimizing the discontinuity point to the secondary damping step through the progressive primary damping operation using the repulsive force of the present invention for all suspension devices having the two-stage damping structure uses a damping function To be used for all suspension devices.

Referring to the washing machine 1 shown in FIG. 1, it can be confirmed that the damping device of the present invention can be utilized in the washing machine 1. That is, the washing machine employing the damping device of the present invention comprises a cabinet 10; An outer tub 30 and an inner tub 20 having an upper opening; A rotary device (40) for rotating the inner tub; And a suspension device (2) connected to the outer tub to reduce vibrations, wherein the suspension device comprises a washing machine having a continuous damping structure with a repulsive force change according to a separation distance of a magnetic body by the continuous damping device .

The pair of first magnetic bodies 230a and 230b and the second magnetic body 210 according to the present invention are installed in the buffer space 123 inside the body 100 and the friction members 310, Is formed between the outer circumferential surface of the support rod 400 and the second magnetic body 210 by a nonwoven fabric or a felt.

The first damping step according to the repulsive force by the magnetic force of the present invention is such that the second magnetic bodies 210 are spaced apart from each other by a predetermined distance between the pair of first magnetic bodies 230a and 230b in the buffer space 123 The repulsive forces of the first and second magnetic bodies 230a and 230b and the second magnetic body 210 on the upper and lower sides are changed according to the separation distance. By thus facing the same polarity, the buffering effect can be achieved by the repulsive force varying according to the separation distance.

In other words, when the distance between the poles of the same magnetic body is spaced apart from each other, the repulsive force is further increased. When the distance between the magnetic poles is narrowed, the magnetic force becomes larger as inversely proportional to the square of the separation distance. . Therefore, when the distance between the upper and lower first magnetic bodies 230a and 230b is narrowed when the vertical vibration is generated, a greater repulsive force is applied to the first and second magnetic bodies 230a and 230b, A continuous damping effect without a discontinuity point can be achieved by the damping section (low damping).

The maximum value of the repulsive force in the primary damping step by the magnetic force (repulsive force) can be formed to be larger than the frictional force value of the friction member 310 in the secondary damping step. Therefore, A repulsive force is generated when two permanent magnets (first and second magnetic bodies) are brought close to each other during piston movement in a first damping step when the first and second permanent magnets are moved up and down along the support rod 400. [ So that the damping force smoothly changes continuously and moves naturally by the second damping step (high damping).

Accordingly, the discontinuity of the damping step is minimized in the two-stage damping structure, and shock noise can be prevented. That is, the continuous damping structure using the magnetic material (permanent magnet) of the present invention eliminates the discontinuity of the damping force, so that the free stroke of the first damping section by the magnetic force in the two-stage damping structure .

That is, in the two-stage damping structure using the friction member having different friction coefficients according to the related art, friction members are installed at two places in the body 100, Step damping structure. However, according to the present invention, in the first damping step, a low damping period does not act on the support rod 400 at all, but a smooth continuous buffering effect is exerted through the magnetic force acting in the buffer space 123 Since the high damping period is provided by the friction member 310 only in the second damping step, the free stroke, which is the first damping section due to the magnetic force of the elastic member 500 during up-down vibration, .

At the same time, the frictional force along the friction member 310 can be adjusted according to the repulsive force maximum value of the magnetic body, so that the secondary damping force can be raised, thereby improving the vibration performance in the transient passage and in the normal maintenance interval .

The present invention also uses the three annular magnetic bodies (permanent magnets) to arrange the same poles so as to face each other, thereby generating a repulsive force gradually increasing in the close movement, so that the support rod (piston) And has a low damping effect during a movement within a free stroke (primary damping interval) within a predetermined range. However, since the repulsive force is gradually increased when the support rod 400 is moved beyond the primary damping force, the transition from low damping to high damping is continuous, . As a result, it is possible to prevent the occurrence of shock noise due to a sudden damping force transition in the two-stage damping structure.

Furthermore, according to the present invention, the free stroke, which is the first damping section, is maximized according to the design of the repulsive force, and the frictional force by the friction member is increased in the second damping section to increase the high damping force high damping can be increased to improve transient vibration and normal vibration characteristics at the same time.

The vibration absorption process of the continuous damping device in the suspension for washing machine of the present invention will be described with reference to the above configuration.

First, referring to FIG. 1, when the rotary device 40 is operated, the inner tub 20, to which the lower end center is axially connected, is rotated at a constant rotation speed. The generated vibration is transmitted to the outer tub 30 surrounding the inner tub 20 and the vibration transmitted to the outer tub 30 is transmitted to the body 100 connected to a plurality of portions of the outer tub 30 . Accordingly, the body 100 can be moved up and down.

Referring to FIG. 3, when the body 100 flows downward, the first magnetic body 230a 230b installed inside the body 100 and the second magnetic body 210 spaced therebetween are narrowed A repulsive force is generated. Such a repulsive force gradually and continuously changes in accordance with the upward and downward movement of the first magnetic bodies 230a and 230b according to the external vibration, so that the primary damping transmitted from the outside can be easily absorbed.

Further, when the body 100 further flows downward or upward and reaches the closest contact of the first magnetic body and the second magnetic body to reach a level equal to or greater than the maximum value of the repulsive force, the gap between the second magnetic body 210 and the support rod 400 A frictional force is generated between the friction member 310 and the outer periphery of the support rod 400. Thus, a higher damping can be absorbed by the second friction member 220.

Accordingly, since the present invention transitions from a progressive continuous first damping step to a second damping step naturally, the discontinuity of the damping force can be minimized.

Accordingly, the vibration generated in the outer tub 30 can be sequentially relaxed, so that the rotation of the inner tub 20 can be substantially performed in a stable state. Furthermore, in the conventional two-stage damping structure, it is possible to prevent the impact noise due to abrupt transition of the damping force, and to improve the durability.

The bumper members 215, 225, 235a, and 235b shown in FIGS. 6 to 8 can move up and down along the support rod 400, The upper and lower ends of the first and second magnetic bodies 230a and 230b and the second magnetic body 210 inside the space 123 may collide with each other to break or break. Therefore, in order to solve this problem, the present invention provides a bumper member 215, 225 (hereinafter, referred to as " bumper member ") capable of relieving an impact at the upper and lower portions of the buffer space, the upper surface and lower surface of the second magnetic body, , 235a, and 235b may be additionally provided.

Further, though not shown, a noise may be generated due to an impact at a portion where the bumper member hits, so that a noise absorbing pad can be additionally provided. Such a noise absorbing pad may be a felt of a certain thickness having a sound absorbing function.

Accordingly, the bumper member and the noise absorbing pad absorb the impact amount generated in the collision between the first magnetic body and the second magnetic body, and absorb the noise generated during the collision. The buffer space 123 is isolated from the outside As a result, it is possible to prevent the impact transmitted to other structures of the present invention by preventing the noise and the impact force in the space from being lowered, thereby extending the service life.

The embodiments described above are intended for a person skilled in the art (hereinafter referred to as "a person skilled in the art") to easily implement a continuous damping device for vibration reduction of a washing machine and a washing machine using the same However, the present invention is not limited to the above-described embodiments and the accompanying drawings, and thus the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes, substitutions, and alterations can be made hereto without departing from the spirit of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are also included in the scope of the present invention.

1: Washing machine 2: Suspension of washing machine
10: Cabinet 20: Inner tub
30: outer tub 40: rotating device (motor)
100: Body 110: Air cap
120: buffer space outer circumference 121: first through hole
122: second through hole 123: buffer space
200: magnetic body 210: second magnetic body
230a: upper first magnetic body 230b: lower second magnetic body
220: second magnetic body accommodating portion 235a: upper first bumper
235b: lower first bumper 215: second bumper
225: second bumper 310: friction member
400: support rod 410: support plate
500: elastic member

Claims (20)

A body connected to the tub of the washing machine and having a buffer space therein;
A support rod fixed to the cabinet of the washing machine and penetrating the body so that the body can flow along the axial direction;
A pair of first resilience members fixedly installed above and below the buffer space of the body;
A second repulsion member which is disposed in the cushioning space and to which a repulsive force is applied from the pair of first reaction members in different directions; And
And a frictional member interposed between the second rebound member and the support rod to form a frictional force therebetween. The method according to claim 1,
Wherein the first and second repulsive members comprise:
Wherein the first magnetic body and the second magnetic body are opposed to each other with the same polarity, so that the repulsive force is applied. 3. The method of claim 2,
The body is formed of a cylindrical cylinder,
Wherein the first magnetic body is formed so that the support rod passes through the annular shape. The method of claim 3,
And the second magnetic body comprises:
Wherein the support rod is annularly formed so as to be tightly fixed to the outer periphery of the support rod with a friction member interposed therebetween. 5. The method of claim 4,
And a second magnetic body accommodating portion formed in a cylindrical shape on the outer periphery of the annular second magnetic body. 6. The method of claim 5,
And a noise absorbing pad is further formed on the upper end surface and the lower end surface of the receiving portion. 3. The method of claim 2,
Wherein the maximum repulsive force of the first magnetic body and the second magnetic body is greater than the frictional force of the friction member. 3. The method of claim 2,
Wherein a repulsive force at a recent contact point between the first magnetic body and the second magnetic body is greater than a static frictional force caused by the friction member. 3. The method of claim 2,
Wherein the first magnetic body and the second magnetic body are formed of permanent magnets. A body connected to the tub of the washing machine and having a buffer space therein;
An air cap covering an upper portion of the body;
A support rod installed through the body and the air cap so that the body can flow along the axial direction and fixedly supported by the cabinet of the washing machine;
An elastic member externally supporting the support rod and elastically supporting the body;
A pair of first magnetic bodies fixedly installed above and below the buffer space of the body;
A second magnetic body disposed in the buffer space and being repulsive from the pair of first magnetic bodies in different directions; And
And a friction member interposed between the second magnetic body and the outer circumferential surface of the support rod to form a frictional force. A body having a buffer space formed therein;
A pair of first magnetic bodies fixedly installed at upper and lower portions in the buffer space;
A second magnetic body disposed between the first magnetic bodies inside the buffer space and subjected to a repulsive force continuously changing in accordance with a distance from the first magnetic body;
A support rod fixedly supported by the second magnetic body and allowing the body to flow in an axial direction; And
And a friction member interposed between the second magnetic body and the outer circumferential surface of the support rod and having frictional force, thereby continuously reducing the vibration. 12. The method of claim 11,
The body is formed of a cylindrical cylinder,
The first magnetic body is fixedly installed so as to penetrate the support rod in an annular shape,
Wherein the second magnetic body is formed in an annular shape so as to be tightly fixed to the outer periphery of the support rod with a friction member interposed therebetween. 12. The method of claim 11,
The magnetic body may include:
And is formed of a permanent magnet,
Wherein a repulsive force at a nearest point of the first magnetic body and the second magnetic body is greater than a static frictional force by the friction member. A body having a buffer space formed therein; A pair of first magnetic members fixedly installed at upper and lower portions of the buffer space; A second magnetic body disposed in the buffer space and having a first damping effect with a repulsive force of the first magnetic body; And a friction member having a secondary damping effect by being brought into close contact with the second magnetic body to form a frictional force,
And a bumper member for relieving an impact when the first magnetic body and the second magnetic body collide with each other. 15. The method of claim 14,
The bumper member
Wherein the vibration damping structure is fixed to upper and lower portions of the buffer space. 15. The method of claim 14,
The bumper member
Wherein the second magnetic body is provided on the second magnetic body. 15. The method of claim 14,
And further includes a second magnetic body accommodating portion on the outer periphery of the second magnetic body. 18. The method of claim 17,
The bumper member
And the upper and lower surfaces of the receiving portion are fixed to the upper surface and the lower surface of the receiving portion. 15. The method of claim 14,
The bumper member
Further comprising a noise absorbing pad at a collision portion between the first magnetic body and the second magnetic body. Cabinet; An outer tub and an inner tub having an upper opening; A rotating device for rotating the inner tub; And a suspension connected to the outer tub to reduce vibrations, the washing machine comprising:
The suspension device includes:
A body having a buffer space formed therein; An air cap covering an upper portion of the body; A support rod installed through the body and the air cap and fixedly supported by the cabinet; An elastic member externally supporting the support rod and elastically supporting the body; A pair of first magnetic bodies fixedly installed above and below the buffer space of the body; A second magnetic body disposed in the buffer space and having a damping effect with the first magnetic body and a repulsive force; And a friction member which is in close contact with the outer periphery of the second magnetic body and the support rod to form a frictional force, and has a continuous damping structure due to a repulsive force change according to the distance of the magnetic body.

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