JPH09155095A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise level by suppressing the generation of impulse force a little with the state of operating still friction as a peak at the upper and lower dead points of slider to be slid inside a cylinder at the time of dehydrating process. SOLUTION: Concerning a washing machine for which an outer tub 11 is supported by a suspension device 15, a slider 41 to be moved up and down while interposing a compression spring is provided inside a cylinder 39 where the suspension device 15 is supported by a lower supporting part provided on the side of outer tub 11, and the lower end part of hanging bar 45 passed through the inside of cylinder 39 is mounted at the slider 41. Then, the upper end part of hanging bar 45 is supported by an upper supporting part 43, which is provided on the side of main body of washing machine, so as to be freely turned, an elastic member for elastically supporting the upper end part of hanging bar 45 and a weight 55 to be moved integrally with the hanging bar 45 are provided on the side of that upper supporting part 43, and impulse force is suppressed by the hanging bar 45 and the weight 55 to be integrally moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine in which vibration and noise can be suppressed to a low level without reducing the capacity of a suspension device.

[0002]

2. Description of the Related Art Generally, in a fully automatic washing machine, a vibration generated during a dehydration operation is absorbed by a suspension device, and a vibration transmission force to an outer box serving as a washing machine main body is suppressed to a small level.

An outline of the suspension device is that a lower end of a suspension rod penetrates into a cylinder that is rotatably supported by a lower support portion on the outer tank side, and the suspension rod has a compression spring inside the cylinder that is opposed to a compression spring. A sliding body that moves up and down is installed. The air in the cylinder goes in and out through the through hole of the hanging rod.

On the other hand, the upper end portion of the hanging bar is rotatably supported by an upper support portion provided in an outer box which is the main body of the washing machine.

[0005]

The suspension device is subjected to a large vibration caused by the imbalance due to the unevenness of the laundry during the dehydration process. This vibration component has a horizontal component and a vertical component, and the movement is a combination of both.

At this time, in the conventional structure, the vibration of the horizontal component is prevented from being transmitted to the outer box by the pendulum structure of the suspension device. Also, regarding the resonance that occurs in this pendulum configuration, a rotatable upper support part,
It is suppressed by the damper effect due to the dynamic frictional resistance of the lower support part and the sliding body.

Regarding the longitudinal vibration component, the compression spring of the suspension device prevents vibration transmission to the outer box, and against the resonance at this time, the damper effect due to the dynamic frictional resistance of the sliding body which moves up and down and the suspension rod. This is suppressed by the air damper effect due to the air damping force that goes in and out through the through hole. However, in the conventional configuration, when the deviation of the laundry is large, the vibration of the outer tub becomes large, and particularly the vertical vibration component produces a loud noise. This is due to the movement of the sliding body due to the vertical vibration during the dehydration operation. That is, when vertical vibration is applied, the sliding body violently moves up and down in the piston. Therefore, at the top-bottom dead center of the sliding body, when the static friction shifts to the dynamic friction, a collision-like vibration having a peak of the state in which the static friction works is generated. One of these vibrations is transmitted to the outer box, which vibrates the outer box and causes noise. The other is transmitted again to the outer box via the cylinder, causing the outer box to vibrate and generate noise.

As a means for solving this, for example, the one described in Japanese Patent Application Laid-Open No. 2-198592 has been known. The spring member of this device has a load of the outer tank and
The spring constant of the spring member must be a certain value or more because it must operate independently even if the exciting force due to the vibration acts, and the resonance frequency cannot be reduced so much that the frequency is relatively low. It was difficult to reduce the ingredients.

Therefore, an object of the present invention is to provide a washing machine capable of suppressing the generation of vibration noise due to a collisional impact as a matter of course while reducing a relatively low frequency component.

[0010]

In order to achieve the above-mentioned object, the present invention firstly provides an outer tub and an inner tub rotatably arranged inside the outer tub, inside the main body of the washing machine. Have
A washing machine in which the outer tub is supported by a suspension device, wherein the suspension device is vertically movable in a cylinder supported by a lower support portion provided on the outer tub side and in which a compression spring is interposed. The lower end of the hanging bar penetrating the inside of the cylinder is mounted on the sliding body, and the upper end of the hanging bar is rotatably supported by the upper support part provided on the main body of the washing machine. An elastic member that elastically supports the upper end of the suspension rod and a weight that moves integrally with the suspension rod are provided on the support portion side.

Secondly, in a washing machine having an outer tub and an inner tub rotatably arranged inside the outer tub in a main body of the washing machine, the outer tub being supported by a suspension device, The suspension device is provided with a vertically movable slide body in which a compression spring is interposed in a cylinder supported by a lower support portion provided on the outer tank side.
The lower end of the hanging rod penetrating the inside of the cylinder is mounted, and the upper end of the hanging rod is rotatably supported by the upper support portion provided on the main body of the washing machine, while the cylinder is attached to the lower support portion side. An elastic member that elastically supports and a weight that moves integrally with the cylinder are provided.

Thirdly, in a washing machine in which an outer tub and an inner tub rotatably arranged inside the outer tub are provided inside a main body of the washing machine, and the outer tub is supported by a suspension device, The suspension device is provided with a vertically movable slide body in which a compression spring is interposed in a cylinder supported by a lower support portion provided on the outer tank side.
The lower end of a hanging rod penetrating the inside of the cylinder is attached, and the upper end of the hanging rod is rotatably supported by an upper support portion provided on the main body of the washing machine, while the sliding member is provided with an elastic member and a sliding member. A weight that is sandwiched by the moving body and that moves integrally with the sliding body is provided.

As a preferred embodiment, the spring constant of the elastic member is k, and the total mass of the weight, suspension rod and sliding member is m.
And the value of the resonance frequency ωn = √ (k / m) rad / s of the shock absorbing means composed of the elastic member and the weight is √2ωn <( The spring constant k and the total mass m of the elastic member are set so as to satisfy the relationship of the maximum peak frequency ω max rad / s of noise.

Alternatively, the center of gravity of the weight is made to coincide with the center of rotation of the upper support portion.

Alternatively, a weight of mass mw is installed at the center of rotation of the upper support portion of the suspension rod.

Alternatively, two weights having a sum of masses m1 and m2 of mw are arranged at opposing positions such that the distances from the center of rotation of the upper support portion are unequal distances r1 and r2, respectively, and two weights are provided. The relationship between the weight and the distance is m1 ・ r1 = m2 ・ r
Set to satisfy 2.

According to such a washing machine, the large vibration generated during the dehydration operation is suppressed by the damper effect due to the dynamic frictional resistance of the vertically moving sliding body and the air damper effect due to the air damping force coming in and out of the cylinder.

On the other hand, at the top dead center and the bottom dead center of the sliding body during the dehydration process, the collisional shock vibration that peaks at the state where static friction works is suppressed by the elastic member and the weight, and the noise level is reduced. Can be achieved.

At the same time, it is possible to efficiently reduce the noise in the low frequency region, which greatly contributes to the noise level.

Further, the increase in the moment of inertia due to the weight can be suppressed to a small level, for example, by matching the position of the center of gravity of the weight with the center of rotation, and the vibration is not amplified.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings of FIGS.

In the figure, reference numeral 1 denotes a main body of a washing machine which serves as an outer box of the automatic washing machine 3, and is supported by an installation surface 7 such as a floor by supporting legs 5 arranged at four positions. An outer tub 9 serving as a washing tub and an inner tub 11 serving as a washing / dehydrating tub are provided inside the main body 1 of the washing machine, and the outer tub 9 on the outside is suspended and supported by four suspension devices 15. There is.

A water pipe 19 to which a drain hose 17 is connected is provided at the bottom of the outer tub 9, and the water pipe 19 is provided with a drain valve 21 that can be opened and closed.

On the other hand, a balancer 23 is provided above the inner tank 11.
However, a pulsator 25 is provided at the bottom, which is the bottom, and the pulsator 25 is fixed to a first conduction shaft 27 that is a double shaft. The bottom of the inner tank 11 is coupled and supported by the flange 31 of the second transmission shaft 29 having a ring-shaped braking surface, and the driving force from the drive motor M input via the V-belt 33 switches the clutch 35. By the first,
It is transmitted to the second transmission shafts 27 and 29, respectively. Therefore, the pulsator 25 can be rotated by transmitting the driving force to the first transmission shaft 27, and the high speed rotation of the inner tank 11 can be performed by transmitting the driving force to the second transmission shaft 29. There is.

As shown in FIG. 2, the suspension device 15 includes a cylinder 39 supported by a lower support portion 37 provided in the outer tub 9, a vertically movable slide member 41 disposed in the cylinder 39, and a cylinder 39. A suspension bar 45 penetrating through the inside, the lower end of which is attached to the sliding body 41, and the upper end of which is supported by an upper support portion 53 provided in the washing machine body 1, and a compression spring provided in the cylinder 39. And 47.

The upper support portion 43 has an upward spherical seat 49.
And the suspension rod 45 penetrates the central portion. The spherical support 49 of the upper support 43 has an upper spherical support 51.
Is rotatably mounted, and a first elastic member 53 and a first weight 55 are provided on the upper surface side thereof.

The first weight 55 is made of a material having a relatively high density such as brass, and the center of gravity G is the hanging rod 45.
Is located on the central axis line X, is fitted and supported so as to move integrally with the suspension rod 45, and the center of gravity G of the first weight 55 is
It coincides with the center of rotation of the spherical seat 49.

The first elastic member 53 is made of a material such as rubber, and is sandwiched from above and below by the first weight 55 and the upper spherical support member 51 while being loosely fitted to the hanging rod 45. It is supported in a fixed state. First elastic member 5
Inside the 3, a stopper 59 is formed by the upper surface 51 a of the upper spherical support 51 and the step 57 of the suspension rod 45. The stopper 59 is the upper surface 51a of the upper spherical support 51.
The step portion 57 and the step portion 57 contact each other over the stopper distance d1 to prevent the first elastic member 53 from being compressed more than necessary, and prevent a load above a certain level such that permanent deformation remains. It is possible to select rubber with low hardness to obtain high vibration isolation performance.

The first elastic member 53 and the first weight 55 are filters for suppressing vibration, and have the following relationship. That is, when the spring constant of the first elastic member 53 is k and the total mass of the first weight 55, the suspension rod 45, and the sliding body 41 is m, the resonance frequency of the filter is ωn = √ (k /
m) The spring constant is such that the value of rad / s satisfies the relationship of √2ωn <(maximum peak frequency of noise ωmax rad / s) with respect to the steady-state rotation speed ω of the inner tank 11 serving as a dehydration tank during dehydration. K and total mass m are set. As a result, as shown in FIG. 4, the resonance frequency region can be shifted from the dotted line to the low frequency side as shown by the solid line.

On the other hand, the lower support portion 37 has a downward spherical receiving surface 61, and the suspension rod 45 penetrates the central portion thereof.
The lower spherical support 6 is attached to the spherical seat 61 of the lower support 37.
3 is rotatably mounted, and the cylinder 39 is arranged via a second elastic member 65 made of a rubber material. The second elastic member 65 is supported by being sandwiched from above and below by the lower spherical support 63 and the cylinder 39, and the stopper 67 is supported by the lower edge 63a of the lower spherical support 63 and the upper edge 39a of the cylinder 39. Has been formed. The stopper 67 prevents the second elastic member 65 from being compressed more than necessary.
As a result, the second elastic member 65 prevents the lower end edge 63a and the upper end edge 39a from abutting each other over the stopper distance d2 and preventing a load above a certain level such that permanent deformation remains.
It is possible to select rubber with low hardness to obtain high vibration isolation performance.

The cylinder 39 is opened at the lower side, and a sliding body 41, a compression spring 47, and a second weight 69 are arranged inside the cylinder 39, respectively.

The second weight 69 is made of a material having a relatively high density such as brass, and is inserted so as to come into contact with the ceiling surface of the cylinder 39 so as to move integrally with the cylinder 39, and is supported by the compression spring 47. Suspended and hanging bar 45
To have a play through.

The compression spring 47 is a coil spring, and its upper end is in contact with the second weight 69 and its lower end is in contact with the sliding body 41.

As shown in FIG. 3, the elastic member 65 and the weight 69.
It is good also as a structure which arrange | positions and on the sliding body 41 side. That is,
The upper end of the cylinder 39 is connected to the spherical seat 61 of the lower support 37.
And a compression spring 77 supported by a spring receiver 75 in the cylinder 39,
Between the sliding body 41, which is attached to the lower end portion of the hanging rod 45 and is composed of a sliding material body 71 formed of a rubber material and a second elastic body 73, and the spring receiving body 75 and the sliding body 41. The elastic body 65 and the weight 69 are provided.

The elastic body 65 is fitted and inserted in the hanging rod 45 with play, and the weight 69 is fitted and supported so as to move integrally with the sliding member main body 71. Regarding the method of determining the spring constant K and the mass mw of this embodiment, when the spring constant of the elastic body 65 is K1 and the spring constant K2 of the sliding member 41, that is, the second elastic body 73, K = K1 + K2. For example, it is exactly the same as the case of the above embodiment.

According to the washing machine constructed as described above, a large amount of washing water is put in at the time of washing, and even if a high load is generated in the outer tub 9, the first and second elastic members 73, 65 are loaded. Therefore, stable vibration damping performance can be obtained over a long period of time.

On the other hand, during the dewatering operation, the large vibration generated at the time of startup is due to the damper effect due to the frictional resistance of the sliding body 41 and the air damping force by which the air in the cylinder 39 goes in and out through the through hole of the suspension rod 45. It is suppressed by the air damper effect. On the other hand, when the dehydration enters the steady operation, the impact shock vibration generated when the static friction changes to the dynamic friction at the top dead center and the bottom dead center of the sliding body 41 causes the first and second elastic members 65, It is suppressed by 73 and the weight 69.

The experimental results are shown in FIG. According to the result of this experiment, it can be seen that the impact force can be suppressed to be small over the entire region as compared with the conventional example shown in FIG. 6 and the known example provided with the spring member shown in FIG. 7. It was also confirmed from the experimental results that the noise level can be suppressed to a low level in the known example (FIG. 9), particularly in a low frequency region as shown in FIG.

FIG. 10 shows a first support provided on the upper support portion 43 side.
9 illustrates another embodiment of the weight 55 of FIG.

That is, the first weight 55 is replaced by two upper and lower weights 5.
The upper spherical support 5 is divided into 5a and 55b, and the upper weight 55a is supported by the spherical seat 49 of the upper support 43.
No. 1 on the upper surface of the upper spherical support 51.
It is provided via the elastic body 53. The weight 55a on the upper side is
It is fitted and supported so as to move integrally with the hanging rod 45. The lower weight 55b is fitted and supported below the upper support 43 so as to move integrally with the suspension rod 45.

The sum of the mass m1 of the upper weight 55a and the mass m2 of the lower weight 55b is the mass mw of the first weight 55.
It is set to be. Further, the distance from the rotation center P satisfies the relationship of m1 · r1 = m2 · r2.

Since the other constituent elements are the same as those in FIG. 2, the same reference numerals are given and detailed description thereof will be omitted.

Therefore, according to this embodiment, in addition to the above-mentioned effect, each weight 5 is moved by the movement of the upper spherical support body 51 due to the swinging of the suspension rod 45 by the movement of the outer tub during the dehydration.
Since the horizontal exciting forces F1 and F2 generated by the accelerations of 5a and 55b have the same force but different directions by 180 degrees, the upper weight 55a and the lower weight 55b are different.
You can expect the effect of canceling each other with and. The weight may be divided into three or more.

[0044]

As described above, according to the washing machine of the present invention, due to the combination of the elastic member and the weight, the static friction acts at the top dead center and the bottom dead center of the sliding body during the dehydration operation. It is possible to suppress collisional vibration having a peak state and reduce the noise level over the entire range. In addition, it becomes possible to cancel the horizontal exciting force generated by the acceleration of the weight.

[Brief description of the drawings]

FIG. 1 is a sectional view of a washing machine according to the present invention.

FIG. 2 is an enlarged sectional view of a suspension device.

FIG. 3 is an enlarged sectional view showing another embodiment of the suspension device on the cylinder side.

FIG. 4 is an explanatory diagram in which a resonance frequency is moved to a low frequency region.

FIG. 5 is an explanatory diagram showing an experimental result of the present invention in which an impact force is transmitted from a suspension rod to an outer box.

FIG. 6 is an explanatory diagram showing an experimental result of a conventional example in which an impact force is transmitted from a suspension rod to an outer box.

FIG. 7 is an explanatory diagram showing an experimental result of a known example in which a spring member for transmitting an impact force from a suspension rod to an outer box is provided.

FIG. 8 is an explanatory diagram showing experimental results of a noise spectrum according to the present invention.

FIG. 9 is an explanatory diagram showing experimental results of a noise spectrum of a known example in which a spring member is provided.

FIG. 10 is a schematic sectional view showing another embodiment of the first weight.

[Explanation of symbols]

 1 Washing Machine Main Body 11 Outer Tub 15 Suspension Device 37 Lower Support 39 Cylinder 41 Sliding Body 43 Upper Support 45 Suspension Bar 53 Elastic Member 55 Weight

Claims (7)

[Claims] 1. A washing machine having an outer tub and an inner tub rotatably arranged inside the outer tub, wherein the outer tub is supported by a suspension device.
The suspension device is provided in a cylinder supported by a lower support portion provided on the outer tank side and provided with a vertically movable slide body in which a compression spring is interposed, and the slide body penetrates the cylinder. The lower end of the hanging rod is attached, and the upper end of the hanging rod is rotatably supported by the upper support portion provided on the main body of the washing machine, and the upper end portion of the hanging rod is elastically attached to the upper support portion side. A washing machine characterized in that an elastic member that is supported on the above and a weight that moves integrally with the hanging bar are provided. 2. A washing machine having an outer tub and an inner tub rotatably arranged inside the outer tub, wherein the outer tub is supported by a suspension device.
The suspension device is provided in a cylinder supported by a lower support portion provided on the outer tank side and provided with a vertically movable slide body in which a compression spring is interposed, and the slide body penetrates the cylinder. The lower end of the hanging rod is mounted, and the upper end of the hanging rod is rotatably supported by an upper support portion provided on the main body of the washing machine, while the lower support portion side elastically supports the cylinder. A washing machine characterized in that an elastic member and a weight that moves integrally with a cylinder are provided. 3. A washing machine having an outer tub and an inner tub rotatably arranged inside the outer tub, wherein the outer tub is supported by a suspension device,
The suspension device is provided in a cylinder supported by a lower support portion provided on the outer tank side and provided with a vertically movable slide body in which a compression spring is interposed, and the slide body penetrates the cylinder. The lower end portion of the hanging rod is attached, and the upper end portion of the hanging rod is rotatably supported by an upper support portion provided on the main body of the washing machine, while it is sandwiched by the elastic member and the sliding member. In addition, the washing machine is characterized in that it is provided with a weight that moves integrally with the sliding body. 4. When the spring constant of the elastic member is k and the total mass of the weight, the suspension rod and the sliding member is m, the resonance frequency ωn = √ (k / m) of the shock absorbing means composed of the elastic member and the weight. r
The value of ad / s is √2ωn <(maximum peak frequency of noise ωmax
The washing machine according to claim 1, wherein the spring constant k and the total mass m of the elastic member are set so as to satisfy the relationship of (rad / s). 5. The washing machine according to claim 1, wherein the center of gravity of the weight is aligned with the center of rotation of the upper support portion. 6. The washing machine according to claim 1, wherein a weight having a mass of mw is installed at a center of rotation of an upper support portion of the suspension rod. 7. The two weights having a sum of masses m1 and m2 of mw are arranged at opposing positions such that the distances from the center of rotation of the upper support portion are distances r1 and r2, respectively. The washing machine according to claim 6, wherein the relationship between the distance and the distance is set to satisfy m1 · r1 = m2 · r2.