JPH08215476A - Vibration control device for fully automatic washing machine - Google Patents

Abstract

PURPOSE: To reduce vibrations at the time of a start and resonance point transit and reduce noises at the time of a stationary operation. CONSTITUTION: An outer tub 18 located outside a washing tub concurrently serving as a spin-drying tub and receiving water at the time of spin-drying is elastically supported by suspensions 24 from four corners of a washing machine main body 23. A spring support plate 27 having a friction material 29 on the outer periphery is fitted at the lower section of the hanging rod 25 of the suspension 24, the spring support plate 27 is covered by a cylindrical spring presser 26 inserted with the hanging rod 25, a compression spring 28 is provided between the spring support plate 27 and the spring presser 26, and a spring presser cover 30 provided with vent holes 30a at least at three positions is fitted to the spring presser 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device used in a home fully automatic washing machine.

[0002]

2. Description of the Related Art Conventionally, a fully automatic washing machine of this type has a structure as shown in FIG. The configuration will be described below.

As shown in the figure, an outer tub 1 receives water at the time of dehydration, and a washing tub 2 which also functions as a dehydration tub is rotatably arranged inside. A speed reducer 4, which is connected to the motor 3 by a belt, is fixed to the lower portion of the outer tub 1. Reducer 4
The drive shaft has a double structure in which the washing tub 4 is fixed to the outer shaft, and the stirring blade 5 located inside the washing tub 4 is fixed to the inner shaft. Further, the outer tub 1 is vibration-supported by a suspension 8 from four corners of the washing machine body 6 via support pieces 7 integrally provided on the outer tub 1.

Next, the structure of the suspension 8 will be described with reference to FIG. The support piece 7 is provided on the outer peripheral surface of the bottom portion of the outer tank 1 and supports the suspension 8. The lower surface of the support piece 7 is a spherical receiving surface 9. The suspension rod 10 constituting the suspension 8 is inserted through a through hole 11 formed in the receiving surface 9 and projects downward. A spring bearing 12 is provided at the lower end of the hanging rod 10, a compression spring 13 is placed on the spring bearing 12, and a damper 14 is placed and supported on the compression spring 13.

The damper 14 has a flange 15a on its outer periphery.
Cylinder portion 15 having a large diameter and a receiving portion 16 having a large diameter at the upper end portion
and a piston portion 16 having a. A lower half portion of the inner peripheral surface of the cylinder portion 15 is formed as a tapered portion 15b having a diameter decreasing toward the bottom portion. On the other hand, the lower half portion of the piston portion 16 also forms a tapered portion 16b corresponding to the tapered portion 15b of the cylinder portion 15. Further, a plurality of disk-shaped damper members 17 as shown in FIG. 9 are stacked and housed in the tapered portion 15b.

The damper member 17 is formed of a soft material such as felt, and the outer diameter of the damper member 17 is slightly smaller than the inner diameter of the upper portion of the cylinder portion 15 and the taper portion 1 is formed.
It is set larger than the minimum inner diameter of 5b. Further, the damper member 17 is impregnated with lubricating oil as a lubricant.

The damper 14 is vertically movably inserted through the lower portion of the suspension rod 10, and the flange 1 of the cylinder portion 15 is inserted.
5a is placed and supported on the compression spring 13. At the same time, the receiving portion 16a of the piston portion 16 supports the outer tub 1. At this time, the damper member 17 provided in the cylinder portion 15 acts to tighten the suspension rod 10 by reducing the diameter by being inserted into the taper portion 15b having a small diameter. At the same time, it is compressed by the weight of the outer tub 1, the washing tub 2, the motor 3 and the like received through the piston portion 16 and acts to tighten the suspension rod 10. That is, the damper member 17 is in frictional sliding contact with the suspension rod 10.

With the above construction, water supply, washing, drainage,
Perform centrifugal dehydration automatically. Generally, in a fully-automatic washing machine, when the washing process is completed and the dehydration process of rotating the washing tub 4 is started, the clothes, which are laundry, are biased, which causes the washing tub 2 and the outside Large vibration is generated in the tank 1. This vibration becomes maximum especially at the time of starting and when passing through the resonance point. In order to suppress the vibration due to this resonance, the damper 1
The vertical movement of 4 is used as a damper force.

That is, the vertical movement of the damper 14 causes a frictional force to act between the damper member 17 and the suspension rod 10, which serves as a damper force to damp the above-mentioned vibration. Further, the greater the amount of laundry, the more the damper member 17 is compressed, and the larger the pressure contact force with the hanging bar 10, the greater the damper force can be obtained, and the greater the amount of vibration damping.

[0010]

However, with such a configuration, it is possible to suppress the vibration at the resonance point of the dehydration start-up and reduce the amplitude of the vibration, but on the other hand, at the time of steady operation, the damper member 17 is used. Since the amount of attenuation due to friction with the suspension rod 10 is large, there is a problem that high-frequency vibration is generated and noise is increased.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to reduce the vibration at the time of starting and at the time of passing through the resonance point, and to reduce the noise at the time of steady operation.

[0012]

In order to achieve the first object, the present invention provides an outer tub located outside a washing tub which also serves as a dehydrating tub to receive water for dehydration, and an outer tub. Each of the suspensions includes a suspension elastically supported from four corners of the main body of the washing machine. Each suspension includes a suspension rod, a spring support plate having a friction material on an outer periphery attached to a lower portion of the suspension rod, and a spring support inserted through the suspension rod. A tubular spring retainer for covering the plate, a compression spring interposed between the spring support plate and the spring retainer, and a spring retainer lid provided with at least three air holes attached to the tubular spring retainer. The first problem-solving means is configured as follows.

In addition to the first means for solving the above problems,
A second problem solving means is to provide a soft material that allows air to pass through, and the soft material is attached so as to cover the hole of the spring restraining lid.

Further, the spring restraining lid of the first problem solving means has a third problem solving means in which, instead of the hole through which air passes, an elastic film is provided in the central portion.

[0015]

According to the first means for solving the above problems, the present invention provides:
The air passing through the spring restraint lid that has holes through which air passes at least at three places increases the damper effect by generating a damper force when the dehydration process starts and when the resonance passes, and high-frequency vibration does not occur during normal dehydration. It is possible to suppress the vibration at the time of starting the process and the resonance passing, and to suppress the noise during the steady state of the dehydration process, and it is excellent in durability at low cost.
Can be made compact.

Further, according to the second means for solving the problems, the air passing through the spring restraining lid having the holes through which air passes at least at three places and the air flowing through the soft material exerts a larger damper force at the time of starting the dehydration process and at the time of resonance passage. It is generated to enhance the damper effect and does not generate high frequency vibration during steady dehydration, so it suppresses vibration during startup of the dehydration process and resonance.
It is possible to suppress noise during the steady state of the dehydration process, and it is excellent in durability and can be made compact.

According to the third means for solving the problems, the spring restraining lid provided with the elastic film in the central portion thereof generates a larger damper force at the time of starting the dehydration process and at the time of resonance passage to enhance the damper effect, Since high-frequency vibrations are not generated when the dehydration process is stationary, it is possible to suppress vibrations when the dehydration process is started and when passing through resonance, and to suppress noise when the dehydration process is stationary, and to have excellent durability and a compact size.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

As shown in FIG. 3, the outer tub 18 is located outside a washing tub (hereinafter referred to as a washing tub) 19 that also serves as a dehydrating tub and receives water used for dehydration. A speed reducer 21 connected to the motor 20 by a belt is fixed to the lower portion of the outer tub 18. The drive shaft of the speed reducer 21 has a double structure,
A washing tub 19 is fixed to the outer shaft, and a stirring blade 22 provided inside the washing tub 19 is fixed to the inner shaft. In addition, the outer tub 18 includes the suspension 24 from the four corners of the washing machine main body 23.
It is supported through vibration isolation.

The suspension 24 is constructed as shown in FIG. The hanging rod 25 is provided from the washing machine main body 23 via a support piece 18a provided in the outer tub 18. The lower portion of the hanging rod 25 and the lower portion of the support piece 18a have a cylindrical spring retainer 2
6 is provided. The spring support plate 27 is provided at a lower portion of the suspension rod 25, and a compression spring 28 is interposed between the spring support plate 27 and the spring retainer 26.

A friction material 29 is provided on the outer circumference of the spring support plate 27. In this embodiment, the friction material 29 is composed of a rubber body molded into an annular flat plate and a ring-shaped spring body provided inside the rubber body. By appropriately selecting and combining the diameter, thickness, surface condition, kind of spring body, etc. of the rubber body, the frictional force of the friction material 29 on the spring retainer 26 can be freely set. The spring restraining lid 30 is attached to the cylindrical spring restraining member 26, and as shown in FIG.
There are some places.

The operation of the above configuration will be described. When the washing process is finished and the dehydration process is started, the outer tub 18 and the washing tub 19 vibrate violently as described in the conventional example. In this embodiment, the suspension 24 absorbs vibrations when resonance occurs at the time of starting the dehydration process, and also suppresses noise during dehydration steady state in which dehydration progresses to some extent.

Until the washing tub 19 starts rotating and passes the resonance point in the dehydration process, the outer tub 18 vibrates greatly due to the whirling motion of the washing tub 19. Therefore, the amount of relative displacement between the spring retainer 26 and the suspension rod 25, which constitute the suspension 24 that receives the vibration of the outer tub 18, also increases. At this time, the damper force f can be expressed as in (Equation 1), where x is the displacement amount of the spring support plate 27.

[0024]

[Equation 1]

Here, c is the damping coefficient due to air, and g is the frictional force due to the friction material. The first term of (Equation 1) represents a damper force that depends on the speed. In the present embodiment, the first term is a damper force generated when air passes through the hole 30a of the spring restraining lid 30, and the second term is the spring support. Friction material 29 provided on the outer periphery of the plate 27
It is a damper force due to a frictional force generated between the cylindrical spring retainer 26 and the cylindrical spring retainer 26.

Here, in the case of the present embodiment, the spin-drying speed is about 1000 rpm, and the frequency of the basic vibration due to the imbalance of clothes is about 1/60, which is about 17 Hz. Also, the frequency range of concern for noise during the dehydration process is approximately 50 Hz.
That is all. Here, regarding the damper force by the air in the first term of (Equation 1), even if the damper force at the frequency of the basic vibration is set high, the damper force in the high frequency range that is annoying due to noise is unlikely to occur. On the other hand, the damper force due to the frictional force of the second term is, as is generally known, when the damper force at the frequency of the basic vibration is set to be high, the damper force in the high frequency range is generated due to noise. It's easy to do.

In this embodiment, the spring restraining lid 30 is provided with 121 holes 30a so that the spring restraining member 26 can be used in the dehydration process.
The spring support plate 27 slides in the interior of the
The air inside 6 repeatedly compresses and expands, whereby the air passes through the hole 30a, and the damper force due to the air can be set high, and the damper force due to friction can be set low accordingly.

As a result of experiments, the number of the holes 30a of the spring restraint lid 30 is not effective even if the diameter of the holes 30a is changed in two places, and at least three holes are required. . That is, according to the present embodiment, the outer tub 18 can be supported with a large damper force at the time of starting the dehydration process and at the time of resonance passage, and the noise can be suppressed to be small during the steady state of the dehydration process.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the soft material 31 is made of felt and is made of felt, and is attached so as to cover the hole 30a provided in the spring restraining lid 30 through which air passes.

In the above structure, the spring restraining lid 30 is provided with the soft material 31, so that the spring restraining lid 30 is provided.
A large damper force can be generated when the air passes through the hole 30a. Therefore, the outer tub 18 can be supported by the large damper force larger than that in the first embodiment when the dehydration process is started and when the resonance is passed, and the noise can be suppressed to a low level during the stationary process of the dehydration process.

Next, a third embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the spring retainer lid 32 is attached to a cylindrical spring retainer 26.
A rubber film 32a, which is an elastic body, is provided at the center of the.

In the above structure, the spring retainer 2 is used during the dehydration process.
When the spring support plate 27 slides in the inside of 6, the spring retainer 26
The air inside will be repeatedly compressed and expanded. The air inside the spring retainer 26 is repeatedly compressed and expanded, whereby the rubber film 32a at the center of the spring retainer lid 32 is deformed and a damper force is generated. Therefore, at the time of starting the dehydration process and when passing through resonance, the outer tub 18 can be supported with a large damper force larger than that of the first or second embodiment.
Noise can be suppressed to a low level during the steady state of the dehydration process.

[0035]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the outer tub, which is located outside the washing tub also serving as the dehydrating tub and receives the water during the dehydration, and the suspension which elastically supports the outer tub from the four corners of the main body of the washing machine. Each of the suspensions includes a suspension rod, a spring support plate having a friction material on the outer periphery attached to the lower portion of the suspension rod, a tubular spring retainer that is inserted into the suspension rod and covers the spring support plate, Since the compression spring is interposed between the spring support plate and the spring retainer, and the spring retainer lid is provided in the tubular spring retainer and has at least three holes through which the air passes, the dehydration process is started. At the same time, it is possible to suppress vibration when passing through resonance, suppress noise during a steady state of the dehydration process, and have low cost, excellent durability, and compactness.

Further, since a soft material through which air passes is provided, and the soft material is attached so as to cover the holes of the spring restraining lid, the air passing through the spring restraining lid and the soft material having at least three holes through which air passes is provided. As a result, when starting the dehydration process and when passing through resonance, a larger damper force is generated to enhance the damper effect, and high-frequency vibration is not generated during the normal dehydration process. It can suppress noise during regular periods, has excellent durability, and can be made compact.

Further, since the spring restraining lid is provided with an elastic film at the center instead of the hole through which air passes, the spring restraining lid having the elastic film at the center resonates at the start of the dehydration process. When passing through, a larger damper force is generated to enhance the damper effect, and high-frequency vibration is not generated during the normal dehydration process.Therefore, it is possible to suppress the vibration during startup of the dehydration process and noise during the normal dehydration process. And can be made compact.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a vibration isolation device for a fully automatic washing machine according to a first embodiment of the present invention.

FIG. 2 is a top view of a spring restraining lid of the vibration isolator of the fully automatic washing machine.

FIG. 3 is a cross-sectional view of a fully automatic washing machine equipped with the same vibration isolation device.

FIG. 4 is a partially cutaway sectional view of a vibration isolation device for a fully automatic washing machine according to a second embodiment of the present invention.

FIG. 5 is a partially cutaway sectional view of a vibration isolation device for a fully automatic washing machine according to a third embodiment of the present invention.

FIG. 6 is a top view of the spring restraining lid of the vibration isolator of the fully automatic washing machine.

FIG. 7 is a sectional view of a fully automatic washing machine equipped with a conventional vibration isolation device.

FIG. 8 is an enlarged sectional view of a conventional anti-vibration device for a fully automatic washing machine.

FIG. 9 is a perspective view of a damper member of the vibration isolator of the fully automatic washing machine.

[Explanation of symbols]

 18 Outer tub 19 Washing tub 24 Suspension 23 Washing machine body 25 Suspension bar 26 Spring retainer 27 Spring support plate 28 Compression spring 29 Friction material 30 Spring retainer lid 30a hole

Claims (3)

[Claims] 1. An outer tub which is located outside a washing tub which also serves as a dehydrating tub and receives water at the time of dehydration, and a suspension which elastically supports the outer tub from the four corners of the main body of the washing machine. A suspension rod, a spring support plate attached to the lower portion of the suspension rod and having a friction material on the outer circumference, a cylindrical spring retainer inserted through the suspension rod and covering the spring support plate, and the spring support plate and the spring retainer. An anti-vibration device for a fully-automatic washing machine, which comprises a compression spring interposed between and a spring restraining lid provided with at least three holes through which air is attached to the cylindrical spring restrainer. 2. A vibration isolator for a fully automatic washing machine according to claim 1, further comprising a soft material through which air is passed, the soft material being attached so as to cover the hole of the spring restraining lid. 3. The spring restraining lid is replaced with a hole through which air passes,
The anti-vibration device for a fully automatic washing machine according to claim 1, wherein an elastic film is provided at the center.