JP2639083B2 - Washing machine anti-vibration device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for a washing machine used in ordinary households.

2. Description of the Related Art A conventional configuration will be described with reference to FIGS. Reference numeral 1 denotes a main body in which a washing tub 2 is suspended and supported by a support rod 3 via a suspension 4. Reference numeral 5 denotes a support fixed to or integrated with the lower portion of the side wall of the washing tub 2. The washing tub 2 is elastically supported on the upper portion of the suspension 4 by the support 5. Numeral 6 denotes a water tank, which performs a washing operation of clothes therein and rotates at a high speed to perform a dehydrating operation. At this time, the clothes are rarely evenly distributed in the water tank 6, and the dehydration is performed while maintaining an uneven distribution, and the unevenness of the clothes causes the imbalance of the rotating object, causing the vibration to occur. Was causing it to occur.

Now, the structure supported by the vibration isolating system such as the support rod 3 and the suspension 4 is called a vibration system, and one that is inevitably constituted by the vibration system and the vibration isolating system is a natural frequency. If, during dehydration, the frequency generated in the vibration system and the natural frequency match, the amplitude of the vibration system becomes extremely large, for example, jumping up and down, colliding with the outer tub 1, or This is a state called a normal resonance point where the rotating shaft is damaged at the critical speed. In order to prevent this, the amplitude must be suppressed by a damping mechanism.

As shown in FIG. 4, a rubber cap 7 having a seal portion on the outer periphery and a rubber cap 7 having a seal portion at an outer periphery thereof, and a support rod 3 penetrating at the center portion are used as a conventional damping method as shown in FIG. Formed by a slider 8 having a cylindrical portion that comes into contact with the inner periphery of a cap 7 made of aluminum. The resistance when air inside the slider 8 flows into and out of the slider 8 due to the vibration of the water tank 6, and between the cap 7 and the slider 8. The damping effect is exhibited by the contact friction force.

Problems to be Solved by the Invention However, the damping device configured as described above mainly obtains a damping force by friction between the cap 7 and the slider 8, and a stable damping force cannot be obtained if the precision of both parts is not very good. Could not be obtained. In particular, in the case of frictional force, there is a considerable difference between the magnitudes of the static frictional force and the dynamic frictional force, and the static frictional force is generally extremely large. Therefore, as shown in FIG. 5, the relative velocity becomes 0 at the top dead center A and the bottom dead center B of the vibration of the cap 7 with respect to the slider 8, and at that time a sudden static friction force acts to cause noise. . Further, even if a small amount of oil or the like adheres between the cap 7 and the slider 8 during the assembly, there is a problem that the damping force is greatly reduced and the vibration system jumps up and down. Furthermore, a characteristic squeaky sound is likely to be generated at the time of frictional contact, which increases the noise value.

In view of the above problems, an object of the present invention is to solve a noise problem peculiar to frictional contact due to viscosity of a fluid.

Means for Solving the Problems In order to achieve the above object, the present invention provides a support rod for suspending and supporting a washing tub from an upper portion of a main body via a suspension, and a cap provided at a lower end portion of the support rod. A slider having a substantially cylindrical body having a lower end portion of the support rod including the cap, wherein the slider is slidable with a gap between the outer periphery of the cap and the upper end of the slider. A bellows-like slider seal having combined elasticity is provided at an upper portion, and a slider lid is provided at a lower portion, and a fluid such as oil is sealed inside.

With the above configuration, the damping force is obtained by the viscous resistance of the oil.There is no large difference between the static friction force and the dynamic friction force unlike the friction force, and strict parts accuracy is not required. . Also, because it is through oil,
Stable performance can be obtained without generating squeak noise or the like generated at the time of frictional contact. Furthermore, the oil inside the slider is completely sealed, and the bellows-like slider seal does not hinder the sliding of the slider.

Embodiment An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 3 denotes a support rod for suspending and supporting the vibration system.
And a slider 8 penetrating the support rod 3 at the center and having a cylindrical portion having a gap x with the outer periphery of the cap 7. Reference numeral 4 denotes a suspension, which is arranged between the upper surface of the cap 7 and the slider 8. Oil 9 is sealed inside the slider 8, and a slider lid 10 fitted to the inner peripheral surface of the lower portion of the slider 8 is fixed to the lower portion of the slider 8 by liquid-tight ultrasonic welding. The slider lid 10 may be fixed in a liquid-tight manner so that oil does not leak to the lower part, and may be fixed by any method other than ultrasonic welding, for example, adhesion, screwing, heat welding, or the like.

A slider seal 11 made of an elastic material such as rubber having a bellows portion is fitted in a liquid-tight manner at the upper end of the slider 8. The upper end is tightly fitted to the support rod 3 to prevent oil 9 from leaking from the upper end.

Next, the operation of the configuration of this embodiment will be described. The enclosed oil 9 flows in and out of the gap x when the cap 7 is vertically vibrated, and obtains a damping force due to the viscosity at that time.

Generally, the damping force due to the viscosity of the oil is proportional to the speed of the cap 7, so that the time change of the damping force becomes a smooth sine curve as shown in FIG. 2, and there is no sudden increase in the damping force. Also, the oil inside is under the slider lid 9
Therefore, since the upper portion is sealed in a liquid-tight manner by the slider seal 11, there is no leakage to the outside. Further, the slider seal 11 follows the vertical vibration of the slider by the bellows portion, so that the seal portion does not wear.

Effect of the Invention As described above, in the present invention, since the damping force is generated by the viscosity of the oil, a large difference between the static friction force and the dynamic friction force peculiar to the friction force, and no squeak noise of the frictional contact are generated, and the noise is reduced. And a small damping device can be realized. Further, it is not necessary to strictly set the component accuracy and the surface condition of the friction contact portion, and the structure is such that oil leakage or the like is hardly generated, so that a stable damping force can be obtained.

[Brief description of the drawings]

1 is a longitudinal sectional view of a damping device showing an embodiment of the present invention, FIG. 2 is a graph showing a temporal change of the damping force, FIG. 3 is a longitudinal sectional view showing a vibration system of a conventional washing machine, FIG. 4 is a longitudinal sectional view of the damping device, and FIG. 5 is a graph showing a temporal change of the damping force. DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Washing tub, 3 ... Support rod, 4 ... Suspension, 7 ... Cap, 8 ... Slider, 9
... oil, 10 ... slider lid, 11 ... slider seal.

Claims (1)

(57) [Claims] 1. A support rod for suspending and supporting a laundry receiving tub from an upper part of a main body via a suspension via a suspension, a cap provided at a lower end of the support rod, and a lower end of a support rod including the cap. With a substantially cylindrical slider,
The slider is slidable with a gap between the outer periphery of the cap and has a bellows-shaped slider seal having an upper end at an upper end and an elastic bellows fitted to the support rod at an upper part, and a slider lid at a lower part. And a vibration isolator in which fluid such as oil is sealed inside.