JPH03168193A - Vibration isolator for washing machine - Google Patents

Abstract

PURPOSE:To prevent deterioration of vibration isolation performance by a method wherein the internal diameter at the upper end of a cylinder of a sliding part is larger than that at the lower end. CONSTITUTION:When water is stored in a water reservoir 12, a holder 24 is relatively positioned at the upper part of an inner case 23 of a sliding body 21. As the internal diameter at the upper end of the inner case 23 is larger than that at the lower end, an O ring 25 is not pressed so hard against the internal surface of the inner case 23 and the degree of compression deformation is small. Then, water in the water reservoir 12 is drained, a compression coil spring 27 expands causing the sliding body 21 to move upward, so that the holder 24 is relatively positioned at the lower part of the inner case 23 of the sliding body 21. At this time, as the O ring 25 is easily restored to the original shape due to a small degree of compression deformation and the diameter at the lower end of the inner case is smaller than that at the upper end, sealing performance between the O ring 25 and the internal surface of the inner case 23, that is, the sealing performance of an air chamber 26, is enhanced, and a good vibration isolating performance can be maintained.

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) An example of a vibration isolating device for this type of washing machine is shown in FIG. In FIG. 5, the sliding body 2 on which the cypress body 1 is placed and supported has a cylindrical shape with a closed top surface, and a hanging rod 3 is inserted through the upper wall portion 2a. ing. A receiver 4 that is inserted through the hanging rod 3 and provided at its lower end to prevent it from coming off,
An O-ring 5, which is a sealing member, is attached to the outer periphery.

This receiver 4 closes the lower opening of the sliding body 2 to form an air chamber 6. A compression coil spring 7 is interposed between the receiver 4 and the upper wall portion 2a of the sliding body 2. In this configuration, the vibration of the sliding body 2 and, in turn, the cypress body 1 is damped by the air damper action of the air chamber 6 formed by the sliding body 2 and the receiver 4.

(Problems to be Solved by the Invention) In the conventional configuration described above, the diameter of the upper inner surface of the sliding body 2 is smaller than the diameter of the lower inner surface.

This is because a taper for die cutting, which is necessary for manufacturing, is provided. In this structure, when water is stored in the tank body, that is, under load, the weight of the tank body 1 increases, so the sliding body 2 moves downward, and the receiver 4 is relatively located above the sliding body 2. . In this case, since the upper inner surface of the sliding body 2 has a smaller diameter than the lower inner surface and the weight of the water in the cypress body 1 acts, the O-ring 5 is strongly pressed against the inner surface of the sliding body 2 by the receiver 4. Compression deforms. After this state continues for a certain period of time, when the water is discharged from the tank body, for example to perform a dewatering operation, the weight of the tank body 1 becomes lighter, so the compression coil spring 7 expands and the sliding body 2 moves upward, and the receiver 4 is relatively located at the lower part of the sliding body 2. In this case, since the O-ring 5 has been strongly compressed and deformed and its shape is difficult to return to its original shape, and the lower mountain surface of the sliding body 2 has a larger diameter than the upper inner surface, the O-ring 5 and the sliding body 2 The sealing performance between the air chamber 6 and the inner surface, that is, the sealing performance of the air chamber 6, may deteriorate, resulting in a reduction in vibration damping performance.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vibration isolating device for a washing machine that can prevent the vibration isolating performance from deteriorating.

[Structure of the Invention] (Means for Solving the Problems) The vibration isolating device for a washing machine of the present invention includes a cylindrical portion and an end plate portion that closes the upper surface of the cylindrical portion, and is connected to a hanging rod through the end plate portion. It has a sliding body that is inserted through and supports the cypress body, and a sealing member is attached to the outer periphery of the hanging rod. A device comprising a holder for forming a chamber and a compression coil spring interposed between the holder and an end plate portion of the sliding body, wherein the cylindrical portion of the sliding body is It is characterized in that it is configured to have a larger diameter than the inner surface of the lower part.

(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. Now, when water is stored in the tank, the weight of the tank increases, so the sliding body moves downward, and the receiver is relatively located at the upper part of the cylindrical part of the sliding body. In this case, since the upper inner surface of the cylindrical portion of the sliding body is configured to have a larger diameter than the lower inner surface, the O-ring is not pressed so much against the inner surface of the cylindrical portion, and the degree of compressive deformation is reduced. After this, when water is drained from the tank, the weight of the tank becomes lighter, the compression coil spring expands, the slide moves upward, and the receiver is relatively positioned at the bottom of the cylindrical part of the slide. . At this time, as mentioned above, the degree of compressive deformation of the O-ring is small and its shape is easy to return to its original shape, and the lower inner surface of the cylindrical portion has a smaller diameter than the upper inner surface, so the O-ring and the cylindrical portion The sealing performance between the inner surface of the air chamber, that is, the sealing performance of the air chamber, is improved, and the vibration damping performance is improved. still,
In this case, since the lower inner surface of the cylindrical part of the sliding body is configured to have a smaller diameter than the upper inner surface, when the receiver is located at the lower part of the cylindrical part, the O-ring is strongly pressed against the inner surface of the cylindrical part. It can be thought of as follows.

However, in this case, since the inside of the tank is drained,
Since the weight of the water in the tank body does not act on the O-ring and only the force of the compression coil spring acts on the O-ring, the O-ring is not pressed strongly against the inner surface of the sliding body compared to the conventional case.

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

First, in FIG. 2, a tank body, for example, a water receiving tank 12, is disposed inside an outer box 11 of a washing machine for dehydrating and washing. A rotary tank 13 is rotatably supported within the water receiving tank 12. Inside the rotating tank 13, a cylindrical body 14 is fixed to the upper flat part, and a container-shaped stirring body 15 is disposed in the lower half. The stirring body 15 and the rotating tank 13 are each driven as appropriate by a drive motor 6 attached to the outer bottom of the water receiving tank 12 via a rotation transmission mechanism 17 consisting of a clutch mechanism, a speed reduction mechanism, etc. ing.

Now, at the four corners of the outer box 11, there are, for example, four hanging rods 1.
8 are each suspended in a swingable manner.

A supporting piece is provided protruding from the lower outer circumference of the water receiving tank 12 in correspondence with the hanging rod 18. This support piece 19 has
As shown in FIG. 1, the lower part of the hanging rod 18 is pushed through and protrudes downward. Here, 260 is a vibration isolating device located at the lower part of the hanging rod 18, which will be described in detail below.

In FIG. 1, the sliding body 21 includes an outer case 22 having a cylindrical shape with a closed upper surface and an inner case 23 having a cylindrical shape. This inner case 23 constitutes a cylindrical part, and is formed so that its upper inner surface has a larger diameter than its lower inner surface, and in this case, for example, the inner diameter gradually decreases from the upper part to the lower part. By inserting the upper part of the inner case 23 into the outer case 22 and engaging the engagement claw 23a formed at the upper end of the inner case 23 with the earthen wall part 22a of the outer case 22, the inner case 23 is inserted. The case 23 and the outer case 22 are integrated. The joint portion between the inner case 23 and the outer case 22 is sealed airtight by applying an adhesive or the like. Thereby, the upper wall portion 22a of the outer case 22 constitutes an end plate portion that closes the upper surface of the inner case 23. Then, the through hole 22b formed in the upper wall portion 22a of the outer case 22 is inserted into the hanging rod 1.
8 is inserted therethrough, so that the sliding body 21 is passed through the hanging rod 18 so as to be able to move up and down. The water receiving tank 12 is placed and supported on the sliding body 21 by placing one of the support pieces on the earthen wall portion 22a. Above hanging rod 18
A receiver 2 that is inserted through the
4 has a concentric convex portion 24a, a spring receiving step portion 24b, and a cylindrical support portion 24c on the outer peripheral portion. This support part 2
A sealing member such as an O-ring 25 is wound around 4c, and the O-ring 25 is attached to the outer circumference of the receiver 24. The lower opening of the sliding body 21 is closed by the receiver 24 to form an air chamber 26. A compression coil spring 27 is interposed between the receiver 24 and the upper wall portion 22a of the sliding body 21. A spring receiving member 28 is provided between the compression coil spring 27 and the O-ring 25.
is mediated. Note that a large diameter caulking portion 18 is formed at the lower end of the hanging rod 18 to prevent the receiver 24 from coming off.
A washer 29 is arranged between a and the receiver 24 to prevent the receiver 24 from coming into direct contact with the caulked portion 18a.

Next, the operation of the above configuration will be explained. Water tank 12 during operation
When a large vibration occurs in the slider 21, the vibration causes the sliding body 21 to
moves vertically with respect to the hanging rod 18. At this time,
The vibration of the sliding body 21 and the water receiver 12 is caused by the compression coil spring 27.
At the same time, the vibration is attenuated by the air damper action of the air chamber 26 formed by the sliding body 21 and the receiver 22. Now, when water is stored in the water receiver 12, the weight of the water receiver 12 becomes heavy, so the sliding body 21 moves downward, and the receiver 24 relatively moves as shown by the solid line in FIG. It is located above the inner case 23 of the sliding body 21. Here, since the upper inner surface of the inner case 23 has a larger diameter than the lower inner surface, the O-ring 25 is not pressed against the inner surface of the inner case 23 so much, and the degree of compressive deformation is reduced. After this, when water is discharged from the water tank 12 to perform a dewatering operation, for example, the weight of the water tank 12 becomes lighter, the compression coil spring 27 expands, and the sliding body 21
moves upward, and the receiver 24 is relatively located at the lower part of the inner case 23 of the sliding body 21, as shown by the two-dot chain line in FIG. At this time, the O-ring 925 has a small degree of compressive deformation and easily returns to its original shape as described above, and the lower inner surface of the inner case 23 has a smaller diameter than the upper inner surface. The sealing performance between the inner surface of the inner case 23, that is, the sealing performance of the air chamber 26 is improved.

As a result, vibration damping performance can be maintained well. In this case, since the lower inner surface of the inner case 23 is configured to have a smaller diameter than the upper inner surface, when the receiver 24 is located at the lower part of the inner case 23, the O-ring 25 is strongly pressed against the inner surface of the inner case 23. It is thought that it can be done. However, in this case,
Since the water in the water tank 12 has been drained, the ffiffi of the water stored in the water tank 12 no longer acts on the O-ring 25, and only the force of the compression coil spring 27 acts on the O-ring 25. Therefore, the O-ring 25 is not pressed strongly against the inner surface of the inner case 23 compared to the conventional case.

FIG. 3 shows a second embodiment of the present invention, and shows a first embodiment.
The differences from the embodiment will be explained below. In FIG. 3, cases 1 to 10, which replace the west case 23, have a cylindrical portion 30a with a large diameter at about one-third of the upper portion.
The cylindrical portions 30a and 30b are integrally formed so that about two-thirds of the lower portion is a cylindrical portion 30b with a small diameter. This results in
The projecting case 30 has an upper inner surface larger in diameter than a lower inner surface. Therefore, in this second embodiment as well, the same effects as in the first embodiment can be obtained.

FIG. 4 shows the third embodiment of the present invention, and shows the first embodiment.
The differences from the embodiment will be explained below. In FIG. 4, 31 is an annular film made of a wear-resistant material such as ultra-high molecular weight polyethylene, which is attached to the support 24.
is inserted into the convex portion 24a of the spring receiving step portion 2 4 b i,
: The outer peripheral part 31a of the mounted body is arranged on the outer periphery of the O-ring 25.

As a result, the film 31 is interposed between the O-ring 25 and the inner case 23.

Therefore, in this third embodiment as well, the same effects as in the first embodiment can be obtained, but in particular, O I)
Since a wear-resistant film 31 is interposed between the ring 25 and the inner case 23, wear of the ring 25 can be prevented, and the sealing performance, that is, the anti-vibration performance can be maintained for a long period of time. Can be retained.

In addition, in each of the above embodiments, the sliding body is integrated with the outer case and the inner case by engagement, but the present invention is not limited to this, and the sliding body may be integrated by, for example, adhesion.

[Effects of the Invention] As is clear from the above description, in the present invention, the cylindrical portion of the sliding body is configured such that the upper inner surface thereof has a larger diameter than the lower inner surface, so that the vibration damping performance does not deteriorate. It has the excellent effect of preventing

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a longitudinal sectional view of a vibration isolator, and FIG. 2 being a longitudinal sectional side view of a washing machine. Further, FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention, and FIG. 4 is a vertical sectional side view of main parts showing a third embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 1 showing a conventional configuration. 1 2 In the drawing, 12 is a water tank (cypress body), 18 is a hanging rod, 20 is a vibration isolator, 21 is a sliding body, 22a is an earth wall part (end plate part),
23.30 is an inner case (cylindrical part), 24 is a receiver, 25 is an O-ring (sealing part {a), 26 is an air chamber, and 27 is a compression coil spring.

Claims (1)

[Claims] 1. It has a cylindrical part and an end plate part that closes the upper surface thereof, and a sliding body is inserted through the end plate part into a hanging rod to support the tank body, and a sealing member is attached to the outer periphery part. a holder provided on the hanging rod at a position capable of closing the lower opening of the sliding body and forming an air chamber in the closed state; and an intervening device between the holder and the end plate of the sliding body. 1. A vibration isolator for a washing machine, characterized in that the cylindrical portion of the sliding body is configured such that an upper inner surface thereof has a larger diameter than a lower inner surface.