JPH0659359B2 - Anti-vibration device for washing machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for a washing machine used in general households.

Structure of conventional example and its problems In a so-called one-tub type washing machine, a dehydration and washing tub (hereinafter referred to as a water tub) rotates at high speed during dewatering. When the frequency matches the resonance frequency, a resonance phenomenon occurs and the amplitude (whirling) becomes extremely large, resulting in a so-called critical speed state. At this time, if the vibration system is provided with a damping structure, the amplitude will be slightly increased, and the vibration will quickly pass through the resonance point.

A conventional structure will be described with reference to FIGS. 1 and 2. Reference numeral 1 is a main body of a washing machine, inside which a selective receiving tank 2 is suspended by a supporting rod 11 via a suspension 4 for vibration-proof support. 5 is a support fixed to the lower part of the side habit of the tip receiving tub 2, and the washing receiving tub 2 is a suspension 4 using this support 5.
Is elastically supported on the upper part of. 6 is an aquarium having a balancer 6a on the upper part thereof, which is used for washing clothes inside by a pulsator (not shown) driven by the driving device 3 at the time of washing, and by the driving device 2 for dehydrating the clothes after washing. It is rotated at high speed to perform dehydration. The clothes are rarely evenly distributed inside the water tank 6 during the dehydration, and the dehydration action is performed in most cases with the uneven distribution. The non-uniformity of the clothes causes imbalance of the water tank 6 and causes vibration during dehydration. It should be noted that this imbalance is suppressed by the action of the balancer 6a during the stable operation after the start of dehydration.

Now, a structure supported by an anti-vibration system such as the support rod 11 and the suspension 4 is referred to as a vibrating system, and a natural frequency is an inevitable component of the vibrating system and the vibrating system. When the vibration generated by the vibration system matches the natural frequency at the time of dehydration activation, the amplitude of the vibration system becomes extremely large, and for example, the laundry receiving tub 2 jumps up or collides with the washing machine main body 1. It is in a state called a resonance point. In order to prevent this, the damping mechanism must suppress the amplitude. During the stable operation after passing the resonance point, the imbalance of the clothes is suppressed by the action of the balancer 6a, and the vibration of the water tub 6 and the laundry receiving tub 2 is small.

There are a method using an air damper and a method using frictional force that are used as ordinary damping methods. For example, in the former method using an air damper, as shown in FIG.
1 and a slider 8 having a cylindrical portion that is in contact with the rubber cap 7 having a seal portion on the outer periphery at the inner periphery and the air inside the slider 8 is exposed to the outside by vibration of the water tank 6. It has a damping effect when flowing in and out. The damping performance is very stable and the damping effect is great, but the cap 7 and the slider 8 require strict dimensional accuracy, and a special surface treatment is required, which is extremely expensive. there were.

As a method using frictional force, for example, as shown in FIG.
As shown in the drawing, a slider 8a having an inverted truncated cone shape having a downwardly sloping sloped portion and a groove is provided, and a damping member 9 having a shape contacting the inverted truncated cone of the slider 8a is provided below the slider 8a. The weight of the system causes a component force P such that the slider 8a presses the support rod 11,
The friction between the slider 8a and the slider 8a attenuates it. This method has the advantage of low cost, but due to the friction between the slider 8a and the damper 9, the component force P does not act stably, the damping performance is unstable, and a large damping force is generated. There was a drawback that it could not be obtained.

OBJECT OF THE INVENTION The present invention eliminates such conventional drawbacks, and aims to reduce the cost and obtain stable damping performance by simplifying the damping structure. is there.

In order to achieve the above-mentioned object, the present invention provides a support in a washing tub that is vibration-isolated and supported through a supporting rod in a main body of a washing machine.
On the upper surface of this support, elastic ribs which are opposed to each other with an opening penetrating the support rod interposed therebetween are integrally provided, and the distance between the ribs is gradually reduced toward the upper side. In the minimum part, the diameter is set smaller than the diameter of the supporting rod, and the length of the long side of the rib is formed so as to become smaller toward the top. Can be shown.

Description of Embodiments An embodiment of the present invention will be described below with reference to the drawings. In addition,
The same numbers are given to the same components as the conventional example.

In FIG. 5, the support 5 is integrally formed on the outside of the laundry receiving tub 2.
Is provided, and the support rod 11 is penetrated through the opening 10 of the support 5. A spring retainer 12 is inserted into the lower end of the support rod 11, and a compression type suspension 4 is positioned above the spring retainer 12.

On the other hand, a slider 13 is arranged between the support 5 and the suspension 4.

As shown in FIG. 6 (c), the opening 10 of the support 5 has a rectangular shape whose long side is the radial direction of the laundry receiving tub 2, and the long side of the opening 10 extends along both sides of the opening 10. Elastic ribs 16 which face each other across the opening are provided integrally. The distance x between the ribs 16 gradually decreases upward as shown in FIG. 6 (c), and is set to about ½ of the diameter of the support rod 11 at the minimum tip portion. Further, the length y of the long side portion of the rib 16 is made smaller toward the upper portion as shown in FIG. 6 (a). The shape of the long side of the rib is such that when a force is applied to the long side of the rib 16 through the support rod 11 in a direction perpendicular to the long side, the internal stress of the rib 16 acts so as to be distributed almost evenly over the entire rib. The rib 16 becomes an elastic leaf spring. Assuming that this configuration is implemented, the long side of the opening 10 is 18 mm, the short side is 6 mm,
The thickness of the rib 16 is 2 mm and its height (from the support 5 to the rib 1
There is one in which the length up to the tip of 6) is 18 mm.

In the above configuration, the small vibration during dehydration is
As shown in the figure, since the tip of the rib 16 elastically presses the support rod 11, when the support 5 and the support rod 11 are relatively displaced by the vibration of the washing tub 2, this damping force is supported. It is obtained by the dynamic friction between the rod 11 and the tip of the rib 16. Further, when there is a large vibration at the time of passing through the resonance point during dehydration, it is displaced in all directions, but as shown in one state at that time in FIG. 8, for example, the support rod 11 is attached to the support body 5. On the other hand, when the rib 16 is displaced in the vertical direction (arrow direction), the entire surface of the rib 16 comes into contact with the support rod 11 and a large dynamic friction is obtained. Therefore, the damping force increases as the vibration amplitude increases. The damping force when the supporting rod 11 is displaced in the long side direction of the rib 16 is obtained by the dynamic friction between the tip end of the rib 16 and the supporting rod 11.

EFFECTS OF THE INVENTION As described above, according to the present invention, by virtue of the rib having a specific configuration, a small vibration (swing in a radial direction and a circumferential direction with respect to a washing tub) during stable dehydration after passing through a resonance point
On the other hand, since the distance between the ribs is set smaller than the diameter of the support rod, a small damping force is obtained due to the dynamic friction generated by the close contact between the tip of the rib and the support rod. With respect to large vibrations (mainly swinging in the circumferential direction of the washing tub), since the support rods are pressed against both ribs, dynamic friction between the ribs and the support rod causes the ribs to be elastic. It plays a role and can obtain a relatively large damping force. Therefore, the vibration is effectively damped when passing through the resonance point during dehydration, and when the vibration is stable after passing through the resonance point, the damping force is small and the vibration transmission to the washing machine body is small, so that stable dehydration or washing can be performed. Further, since it is a simple one that only considers the structure of the ribs, the cost of the damping mechanism can be reduced and the assembling performance can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a conventional dewatering washing machine, FIGS. 2 and 3 are sectional views of a conventional damping device, FIG. 4 is a perspective view of the same, and FIG. 5 is an embodiment of the present invention. 6A is a longitudinal sectional view of the support, FIG. 6B is a sectional view taken along line AA in FIG. 6A, and FIG. 6C is B in FIG.
7B and FIG. 7 are sectional views for explaining the operation of the apparatus. 1 ... Washing machine main body, 2 ... Washing tank, 4 ... Suspension, 5 ... Support, 11 ... Support rod, 12 ... Spring restraint, 13 ... Slider.

Claims (1)

[Claims] 1. A support is provided in a washing tub which is vibration-isolated and supported through a support rod in a main body of a washing machine, and a support is provided on an upper surface of the support.
Elastic ribs that are opposed to each other are sandwiched between rectangular openings having the long sides extending in the radial direction of the laundry receiving tub, and the opposing ribs increase the distance between the ribs. A vibration damping device for a washing machine, in which the length of the long side portion of the rib is made smaller toward the upper portion while the diameter of the rib is set smaller than the diameter of the supporting rod at the minimum portion.