JPH0292396A - Vibration proofing device for washing machine - Google Patents

Abstract

PURPOSE:To prevent vibration proofing performance from varying with season while holding said performance for a long period by forming an air damper in an air chamber formed of a slide body and a carrier and a seal member of a material of ultrahigh M.W. polyethylene or the like having antiwear property. CONSTITUTION:Suspension rods 28 are swingably suspended at four corners of an outer box and provided on the lower portion vibration preventing devices 30 respectively. When large vibrations are generated in a water receiving tank 22 during dehydrating running, slide bodies 31 are moved vertically relative to the suspension rods 28. Then, while the vibrations of slide body 31 and said tank 22 are buffered by a compression spring 34, the vibrations are attenuated by the action of an air damper in an air chamber 33 formed of the slide body 31 and a carrier 32. Thus, the vibration preventing performance is not varied with season. Also, since a seal member 35 is formed of a material like ultrahigh M.W. polyethylene having antiwear property, the antiwear property of the seal member 35 can be improved to hold the vibration preventing performance satisfactorily for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a vibration isolating device for a washing machine that prevents vibration of a tub body swingably supported on a hanging rod.

(Prior Art) As an example of a vibration isolating device for this type of washing machine, one shown in FIG. 3 is provided. In FIG. 3, reference numeral 1 denotes a sliding body consisting of an upper closure body 2 and a resilient rubber buffer tube 3, which is inserted into a hanging rod 4 so as to be movable up and down, and is attached to a support piece (not shown) of the tank body. 5 is supported. Reference numeral 6 denotes a spring receiver provided at the lower end of the hanging rod 4, and a compression coil spring 7 is interposed between the spring receiver 6 and the upper closing body 2 of the sliding body 1. As a result, vibrations of the tank body during dewatering etc. are buffered by the compression coil spring 7, and the vibrations are also absorbed by the sliding body 1.
When it moves up and down, it is damped by the sliding resistance between the cylindrical part 6a formed on the outer circumference of the spring receiver 6 and the buffer tube 3. However, in this case, since the buffer tube 3 is made of rubber, it is difficult to achieve precision in its inner diameter dimension, and the tightness between the spring receiver 6 and the cylindrical portion 6a tends to vary, making the sliding resistance unstable. There was a drawback that the anti-vibration performance became unstable. Furthermore, since the hardness of rubber changes depending on the temperature, it becomes soft in the summer and has low sliding resistance, and becomes hard and has high sliding resistance in the winter, so the anti-vibration performance has been unstable depending on the season. Furthermore, since the rubber buffer tube 3 is easily worn out, there is a problem in that the vibration damping performance deteriorates.

As a solution to these problems, a device shown in FIG. 4 has been proposed. In FIG. 4, 8 is a sliding body made of synthetic resin, 9 is a rubber backing provided at the lower end of the hanging rod 4, and an air chamber 10 is formed by these. A lip 9a formed on the outer circumference of the rubber backing 9 is provided so as to be in contact with the inner circumferential surface of the cylindrical portion 8a of the sliding body 8, and a felt 11 impregnated with oil is provided on the rubber backing 9. There is. In this case, the vibration of the tank body is attenuated by the air damper action of the air chamber 10, and unlike the case shown in FIG. 2, the vibration damping performance does not change depending on the season.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional configuration, when the sliding body 8 moves up and down, the oil impregnated in the felt 11 may scatter to the inner peripheral surface of the upper part of the sliding body 8, or oil lip 9
If the oil is used for a long period of time, the rubber backing 9 will wear out and the anti-vibration performance will deteriorate. There was a problem that it deteriorated.

Therefore, an object of the present invention is to provide a vibration isolating device for a washing machine that can prevent vibration isolating performance from changing depending on the season, can maintain good vibration isolating performance over a long period of time, and can be realized with a simple configuration. It is on offer.

[Structure of the Invention] (Means for Solving the Problems) The vibration isolating device for a washing machine of the present invention has a cylindrical shape with a closed upper part, and has a sliding rod that is inserted through the upper wall into a hanging rod to support a tub. A movable body is provided, and a receiver is provided on the hanging rod at a position capable of closing the lower opening of the slider and forms an air chamber in the closed state, and the receiver and the upper wall of the slider are connected to each other. a compression coil spring interposed between the seal members, the seal member being provided in the receiver so as to be in contact with the inner circumferential surface of the sliding body and made of a wear-resistant material such as ultra-high molecular weight polyethylene; It is characterized in that it includes an elastic body disposed on the outer circumference of the receiver and pressing the seal member against the inner circumferential surface of the sliding body.

(Function) According to the above-mentioned means, the vibration of the sliding body and thus the tank body is damped by the air damper action of the air chamber formed by the sliding body and the receiver. Therefore, the anti-vibration performance does not change depending on the season. Since the sealing member is made of a wear-resistant material such as ultra-high molecular weight polyethylene,
The abrasion resistance of the sealing member can be improved and vibration-proofing performance can be maintained satisfactorily for a long period of time. In addition, since the receiver, the seal member, and the elastic body are provided separately, and the seal member is simply pressed against the inner circumferential surface of the sliding body by the elastic body arranged on the outer periphery of the receiver, it is possible to Their assembly becomes easy and can be realized with a simple configuration.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

First, in Fig. 2, 21 is the outer box of the dehydrating and washing machine;
Reference numeral 2 denotes a tank body provided within this outer box 21, for example, a water receiving tank 22, and a rotary tank 23 is rotatably supported within this water receiving tank 22. Inside the rotating tank 23, a cylindrical body 24 is disposed in the upper half, and a container-shaped stirring body 2 is disposed in the lower half.
5 are arranged. The stirring body 25 and the rotating tank 23 are each driven as appropriate by a drive motor 26 attached to the outer bottom of the water receiving tank 22 via a rotation transmission mechanism 27 consisting of a clutch mechanism, a speed reduction mechanism, etc. ing.

Now, reference numeral 28 denotes, for example, four hanging rods provided inside the outer box 21, and these are swingably suspended from the four corners of the outer box 21, respectively. 29 is a hanging rod 2 attached to the outer periphery of the lower part of the water receiving tank 22.
As shown in FIG. 1, this support piece protrudes in correspondence with the support piece 8, and has a V-spherical receiving surface 29a formed on its lower surface, and a transparent support piece formed on this receiving surface 29a. The lower part of the hanging rod 28 passes through the hole 29b and projects downward. Here, 30 is a vibration isolator located at the lower part of the hanging rod 28, which will be described in detail below.

In FIG. 1, numeral 31 is a cylindrical sliding body with a closed upper part, and the upper surface of the upper part 931a is formed into a V-spherical shape, and the through hole 31 formed in the upper wall 31a
A hanging rod 28 is inserted through b, so that the hanging rod 28 is vertically movable.

The water receiving tank 22 is supported by the sliding body 31 by placing the support piece 29 on the upper wall 31a. Reference numeral 32 denotes a receiver, which is provided at the lower end of the hanging rod 28 in a locking manner and positioned so as to close the lower opening of the sliding body 31. An air chamber 33 is formed by the receiver 32 and the sliding body 31. The receiver 32 also has a concentric protrusion 32a and a spring receiver step 32b.
and a receiving part 32c are formed. Reference numeral 34 denotes a compression coil spring, which is interposed between the receiver 32 and the upper wall 31a of the sliding body 31 with the hanging rod 28 inserted therein, and is housed in the air chamber 33.

Reference numeral 35 denotes a ring-shaped sealing member made of a wear-resistant material such as ultra-high molecular weight polyethylene;
It is inserted through the convex part 32a and placed on the spring receiving stage part 32b, and the outer peripheral part 35a is provided so as to be in contact with the inner peripheral surface of the sliding body 31.

Here, the outer diameter dimension of the seal member 35 is set larger than the inner diameter dimension of the sliding body 31, and the seal member 35
has sufficient tightening allowance. 36 is an elastic body, for example, an O-ring, which is attached to the receiving part 32c on the outer circumference of the receiving member 32.
The sealing member 35 is pressed against the inner circumferential surface of the sliding body 31. In addition, 37 is the seal member 3
5 and the compression coil spring 34.

Next, the operation of the above configuration will be explained. Water receiver during dehydration operation, etc.)! When a large vibration occurs in 22, the sliding body 31 moves in the vertical direction with respect to the hanging rod 28 due to the vibration. At this time, the vibrations of the sliding body 31 and the water receiving tank 22 are damped by the compression coil spring 34, and the vibrations are attenuated by the air damper action of the air chamber 33 formed by the sliding body 31 and the receiver 32. Therefore, the anti-vibration performance does not deteriorate depending on the season. In addition, the seal member 35
Since the seal member 35 is made of a wear-resistant material such as ultra-high molecular weight polyethylene, the wear resistance of the seal member 35 can be improved.
Good anti-vibration performance can be maintained over a long period of time, increasing reliability. Further, the receiver 32 is provided with a seal member 35 and an O-ring 36 separately, and the seal member 35 is attached to the inner peripheral surface of the sliding body 31 by the O-ring 36 disposed on the receiving step 32c on the outer periphery of the receiver 32. Since the structure is simply pressed, it is easy to manufacture each part and assemble them.
This can be achieved with a simple configuration.

In the above embodiment, the outer diameter of the seal member 35 is set larger than the inner diameter of the sliding body 31 and has a sufficient tightening margin, so that it does not deform due to repeated vertical movements of the sliding body 31. However, since the O-ring 36 presses the sealing member 35 against the inner circumferential surface of the sliding body 31, the airtightness between the sealing member 35 and the inner circumferential surface of the sliding body 31 is improved. , it is possible to stabilize the anti-vibration performance. In particular, even when the inner diameter of the sliding body 31 changes due to a draw taper, for example, the sealing member 35 is pressed against the inner peripheral surface of the sliding body 31 by the O-ring 36. It is possible to maintain airtightness between 35 and the inner circumferential surface of the sliding body 31, and stabilize the vibration damping performance.

[Effects of the Invention] As is clear from the above description, the present invention includes a sliding body that has a cylindrical shape with a closed upper part and is inserted through the upper wall into a hanging rod to support the tank body, and the hanging rod a compressor, which is provided at a position where the lower opening of the sliding body can be closed and forms an air chamber in the closed state, and which is interposed between the bracket and the upper wall of the sliding body a coil spring, and a sealing member provided in the receiver so as to be in contact with the inner circumferential surface of the sliding body and made of a wear-resistant material such as ultra-high molecular weight polyethylene; Since the structure includes an elastic body disposed on the outer circumference and pressing the sealing member against the inner circumferential surface of the sliding body, it is possible to prevent the vibration-proofing performance from changing depending on the season, and
It has the excellent effect of being able to maintain good anti-vibration performance over a long period of time and realizing it with a simple configuration.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional view of a vibration isolator, and FIG. 2 is a vertical cross-sectional view of the entire vibration isolator. Further, FIGS. 3 and 4 are views corresponding to FIG. 1, respectively, showing different conventional configurations. In the drawing, 22 is a water tank (tank body), 28 is a hanging rod, 30 is a vibration isolator, 31 is a sliding body, 32 is a receiver, 33 is an air chamber,
34 is a compression coil spring, 35 is a sealing member, and 36 is an O-ring (elastic body). Applicant: Toshiba Corporation

Claims (1)

[Claims] 1. A sliding body which has a cylindrical shape with a closed upper part and is inserted through the upper wall into a hanging rod to support the tank body; a receiver that forms an air chamber in the closed state; a compression coil spring interposed between the receiver and the upper wall of the sliding body; a sealing member formed of a wear-resistant material such as ultra-high molecular weight polyethylene; and an elastic body disposed on the outer periphery of the receiver and pressing the sealing member against the inner periphery of the sliding body. An anti-vibration device for washing machines.