JPH0810489A - Vibration preventing device of washing machine - Google Patents

Abstract

PURPOSE:To certainly absorb vibration by a coil spring by making a rubber member smoothly slidable along a hanging and guide rod over a long period of time by bringing the grease stored in an annular recessed groove into contact with the hanging and guide rod. CONSTITUTION:A coil spring 33 is externally fitted to the lower part of the hanging and guide rod 30 of a water tank 2 and a spring receiver 34 is attached to the lower end of the hanging and guide rod 30. The coil spring 33 is received by the spring receiver 34. A rubber member 31 receiving the load of the water tank 2 is externally fitted to the hanging and guide rod 30 by a through hole 31c above the coil spring 33 so as to be slidable along the hanging and guide rod 30. An annular recessed groove 3a storing grease is formed to the inner surface of the through hole 31c and a spring cap 32 is interposed between the rubber member 31 and the coil spring 33. The rubber member 31 is clamped corresponding to the displacement content of the rubber member 31 by the spring cap 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration preventing device for a washing machine.

[0002]

2. Description of the Related Art Generally, a fully automatic washing machine has a housing in which a water tub having a washing and dehydrating tub built therein is accommodated, and the water tub is prevented from being transmitted to the housing by a vibration preventing device. Held in. An example of such a vibration prevention device is disclosed in Japanese Patent Laid-Open No. Sho 56-1889.
There is one disclosed in Japanese Patent No.

This anti-vibration device comprises a plurality of suspension / guide rods suspended from the housing. A coil spring is installed on the lower portion of the suspension / guide rod, and a spring receiver is provided at the lower end of the suspension / guide rod. The coil spring mounted on the suspension and guide rod is received by a spring receiver. Further, on the coil spring, a rubber body is externally fitted to the hanging and guiding rod so as to come into contact with the coil spring and to be slidable along the hanging and guiding rod. The rubber body can receive the load of the water tank in the housing. Therefore, when the water tank vibrates during washing or dehydration, the rubber body receiving the load of the water tank slides along the hanging / guide rod and the coil spring elastically deforms. That is, the vibration is absorbed by the elastic deformation of the coil spring.

By the way, when the coil spring absorbs the vibration, when the coil spring is completely expandable and contractible,
Vibration does not subside easily. Therefore, as shown in FIG. 4, the vibration preventing device is provided with a fastener 320 that is externally fitted to the rubber body 31 from below. As a result, when the rubber body 31 slides downward, the rubber body 31 is locked by the fastener 32.
It is squeezed in the axial direction by 0, and the hanging and guiding rod 30
Tighten. As a result, the frictional force between the rubber body 31 and the suspension / guide rod 30 is increased, and the vibration is damped.

[0005]

However, in the above-mentioned conventional vibration preventive device, the rubber body 31 is damaged due to aging or the like.
There is a drawback that the rubber body 31 does not properly suspend and tighten the guide rod 30 in proportion to the load applied to the.
This problem is detailed below.

As described above, this vibration preventing device absorbs vibrations by the coil springs and damps the vibrations by the rubber body 31. The rubber body 31 tightens the suspension / guide rod 30 by the applied load, but at the same time, it needs to slide smoothly along the suspension / guide rod 30. Therefore, grease is filled between the through hole of the rubber body 31 and the hanging / guide rod 30.

However, in the conventional anti-vibration device, when a slight vibration occurs in the water tank when a small amount of laundry is dehydrated, the rubber body 31 also finely moves up and down along the suspension / guide rod 30, The grease between the through hole and the suspension / guide rod 30 comes out (see FIG. 4: G shows the removed grease). In this way, the rubber body 31 and the hanging / guide rod 30
In a so-called oil-depleted state in which the grease has come out from the contact portion with the rubber body 31, the rubber body 31 cannot be slid smoothly along the suspension / guide rod 30. And in some cases,
When the rubber body 31 is fastened to the suspension / guide rod 30, it is fixed to the suspension / guide rod 30, and the vibration generated in the water tank during washing or the like is not transmitted to the coil spring.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vibration preventing device for a washing machine which allows a rubber body to smoothly slide along a guide rod for a long period of time and reliably absorbs vibration generated during washing or the like. Is.

[0009]

The invention according to claim 1 for achieving the above object is a vibration preventive device for preventing vibration generated in a water tank from being transmitted to an outer housing in a washing machine. A long guide rod, a through hole through which the guide rod is inserted, a rubber body that slides and displaces along the guide rod when a load is applied from a water tank, and a rubber body that displaces along the guide rod. A coil spring to be expanded and contracted, a lubricant interposed between the guide rod and the rubber body, and the rubber body is tightened according to the displacement content of the rubber body to reduce the sliding resistance between the rubber body and the guide rod. The rubber body is provided with a recess for storing a lubricant on the inner surface of the through hole through which the guide rod is inserted.

According to a second aspect of the present invention, the concave portion includes an annular concave groove extending in the inner peripheral direction of the through hole. The invention according to claim 3 is characterized in that the concave portion includes a concave groove extending in the axial direction of the through hole. The invention according to claim 4 is characterized in that the recess includes a large number of fine recesses.

According to a fifth aspect of the present invention, the guide rod is characterized in that it penetrates through the rubber body and extends upward, and the upper end thereof is attached to the housing and also serves as a water tank suspension rod. .

[0012]

According to the first aspect of the invention, when the lubricant is filled between the through hole of the rubber body and the guide rod, the lubricant is stored in the recess formed in the inner surface of the through hole. And is interposed between the non-formed portion of the recess and the guide rod.
In this state, when a small amount of laundry is dewatered, if the rubber body finely moves up and down along the guide rod due to slight vibration in the water tank, the lubrication between the non-formation part of the recess and the guide rod will occur. Although the material will come out, the lubricant stored in the recess contacts the guide rod, so that the oil will not run out and there will always be a stable sliding resistance between the rubber body and the guide rod. When the rubber body is obtained and is tightened by the tightening means, it is not fixed to the guide rod.

In addition, even if the lubricant in the recess comes out, when the water is stored in the water tank and the coil spring is fully compressed, the rubber body slides along the guide rod accordingly. Due to the sliding of the rubber body at this time, the lubricant adhering to the guide rod invades between the rubber body and the guide rod, so that the lubricant is stored again in the recess,
A stable sliding resistance can be obtained between the rubber body and the guide rod for a long period of time.

According to the present invention, when the rubber body is tightened, the inner surface of the through hole of the rubber body, which is in contact with the guide rod having no recess, tightens the guide rod. The damping effect is similar to that of the above-mentioned prior art. The inventions of claims 2 to 4 are the same as the above claim 1.
The configuration of the described recess is limited. According to the invention of claim 2, in the annular groove extending in the inner circumferential direction of the through hole, in the invention of claim 3, the groove extending in the axial direction of the through hole, and in accordance with the invention of claim 4, The lubricant is stored in each of the many fine recesses. Therefore, even in these cases, the rubber body comes into contact with the guide rod with the lubricant interposed, and a stable sliding resistance is always obtained between the rubber body and the guide rod.

According to the fifth aspect of the present invention, since the guide rod also serves as the water tank suspension rod, the guide rod does not require a separate structure for holding the water tank.
The structure of the washing machine is simplified.

[0016]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 2 is a cross-sectional view showing a schematic configuration of a fully automatic washing machine equipped with a vibration prevention device according to an embodiment of the present invention. This washing machine has a housing 1 which is rectangular in plan. On the upper surface of the housing 1, a laundry entry port 5 covered with a lid 4 that can be opened and closed is provided. A water tank 2 containing a washing and dehydrating tank 20 is housed in the housing 1. In a space below the water tank 2, a motor 6 and a clutch 7 connected to the motor 6 by a belt 9 are arranged. The clutch 7 selectively transmits the rotational force of the motor 6 to the pulsator 8 installed at the bottom of the washing / dehydrating tub 20 or the washing / dehydrating tub 20 itself.

The water tank 2 is held by the vibration preventing device 3 so that the vibration generated in the water tank 2 is not transmitted to the housing 1. Water tank 2 included in this vibration prevention device 3
The hanging and guiding rods 30 are respectively hung from the four corners of the inner surface of the upper portion of the housing 1. These four vibration preventing devices 3 have the same structure, and the vibration preventing device 3 corresponding to one of the hanging / guide rods 30 is shown in FIG.
FIG. Hereinafter, description will be made with reference to FIG.

The suspending and guiding rod 30 is, for example, a slender stainless steel rod, and the lower end portion 3 of the suspending and guiding rod 30 is used.
0a is bent in a substantially L shape. A vibration absorber 35 is supported on the lower end portion 30a. The vibration absorbing device 35 is provided with a spring receiver 34, a coil spring 33, and a spring cap 32 which are fitted to the suspension / guide rod 30 in order from below. Specifically, the lower end portion 30
The spring receiver 34 is fitted and mounted on a. The spring receiver 3
4 is provided with a groove 34a on the upper surface thereof.
The lower end of the coil spring 33 is fitted in a. A spring cap 32 is fitted on the upper end of the coil spring 33. The spring cap 32 has a bottomed cylindrical main body 32a.
And a holding piece 32b annularly protruding from the peripheral edge of the upper end of the main body 32a. The holding piece 32
The b is composed of a protruding piece 32c connected to the upper end of the main body 32a and protruding obliquely downward, an upright piece 32d and a horizontal piece 32e connected to the tip end of the protruding piece 32c, and a holding piece 32b. The upper end of the coil spring 33 is interposed between the main body 32a and the main body 32a. At the center of the bottom wall of the main body portion 32a, there is provided a hole portion having a diameter substantially equal to the outer diameter of the suspending and guiding rod 30, and the main body portion 32a is also used for suspending and guiding by the hole portion. It is fitted onto the rod 30.

The rubber body 31 receives the load of the water tank 20. The rubber body 31 is provided in the vicinity of the center of the tubular body 31a having a through hole 31c having a diameter substantially corresponding to the outer diameter of the hanging / guide rod 30, and near the center of the tubular body 31a. The spring cap 3
Flange portion 31b adapted to the shape of the second holding piece 32b
It is composed of The tubular body 31a has a through hole 3
The mounting plate 2 is fitted into the hanging / guide rod 30 by 1c and protrudes from the lower side surface of the water tank 2.
5, the base end of the upper surface of the flange 31b is in contact with the peripheral edge of the hole 26 on the lower surface of the mounting plate 25. On the outer surface of the cylindrical body 31a, below the flange portion 31b, the main body portion 32a of the spring cap 32 is provided.
The lower surface of the flange portion 31b is in contact with the upper surfaces of the protruding piece 32c and the horizontal piece 32e. Figure 1
(a) is an enlarged sectional view of the rubber body 31. As shown in FIG. 1 (a), a plurality (three in the figure) of annular recessed grooves 3a extending in the inner circumferential direction of the through hole 31c are provided on the inner surface of the through hole 31c of the tubular body 31a. And this allows
Through-hole 31c of cylindrical body 31a and hanging / guide rod 30
The grease filled in between is stored in the annular groove 3a formed on the inner surface of the through hole 3c, and the grease between the non-forming portion of the annular groove 3a and the hanging / guide rod 30 is also stored. Will be intervened in.

Therefore, in this vibration preventing device 3, when the water tub 2 vibrates during washing or dehydration, the vibration causes the mounting plate 25.
Is transmitted to the rubber body 31 via the, and in response to the vibration, the rubber body 31 slides downward along the suspending and guiding rod 30, and at the same time, the coil spring 33 is elastically deformed to absorb the vibration. Therefore, the vibration is not transmitted to the housing 1.

By the way, if a large load is applied to the water tank 20 rapidly with a large amount of displacement, the water tank 20 has a large vertical amplitude. Therefore, in the vibration prevention device 3, the inner surface of the main body portion 32a of the spring cap 32 is formed in a tapered shape that decreases downward, and the tubular body 3 of the rubber body 31 is formed.
The area below the flange portion 31b in 1a is also the main body portion 3
It is formed in a tapered shape corresponding to 2a. Therefore,
When the above-mentioned load is applied to the water tank 20 and thereby the rubber body 31 is rapidly and largely displaced downward along the suspending and guiding rod 30, the rubber body 31 is deeply fitted into the spring cap 32. When tightened, the sliding resistance between the rubber body 31 and the hanging / guide rod 30 increases, and a large vertical amplitude of the water tank 20 is suppressed.

In the vibration preventing device 3 as described above, when the small amount of laundry is dehydrated, a slight vibration is generated in the water tank 2, and the rubber body 31 is finely moved up and down along the hanging / guide rod 30. Then, the grease between the non-formation portion of the annular groove 3a and the hanging / guide rod 30 comes out, but the grease stored in the annular groove 3a is suspended in the hanging / guide rod 30. Therefore, a proper sliding resistance is always obtained between the rubber body 31 and the hanging / guide rod 30, and when the rubber body 31 tightens the hanging / guide rod 30, It does not stick to the hanging / guide rod 30.

FIG. 1B shows a rubber body 31 according to the second embodiment.
FIG. 1 (c) is a plan view of FIG. In this embodiment, instead of forming the annular groove 3a on the inner surface of the through hole 31c of the rubber body 31, the through hole 31 is formed.
A plurality of (four in the figure) concave grooves 3b extending in the axial direction of c are provided. FIG. 1D is an enlarged cross-sectional view of the rubber body 31 according to the third embodiment. In this embodiment, a large number of concave portions 3c are provided on the inner surface of the through hole 31c of the rubber body 31. Also in these examples, since the grease stored in the concave groove 3b or the concave portion 3c contacts the suspending and guiding rod 30, the rubber body 31 is not fixed to the suspending and guiding rod 30. .

The recess formed on the inner surface of the through hole 31c of the rubber body 31 may be a combination of the recesses described in the above embodiments. That is, the through hole 31c
On the inner surface of the annular groove 3a and the groove 3b or the recess 3c.
It is also possible to form a groove formed by combining and a groove formed by combining the concave groove 3b and the concave portion 3c. Further, the concave groove formed on the inner surface of the through hole 31c is not limited to the above-mentioned groove, and may be another groove.

Further, in the above-described embodiment, the guide rod 30 also serves as a suspension rod for holding the water tank 2 in the housing 1. However, for example, it is separate from the suspension rod for holding the water tank 2. A guide rod protruding from the bottom wall of the housing may be provided, and a vibration preventing device may be provided corresponding to the guide rod.

[0026]

According to the first to fourth aspects of the present invention, since the rubber body is not fixed to the guide rod, the vibration generated in the water tank during washing or the like is transmitted to the coil spring and reliably. It is not absorbed and transmitted to the housing. According to the invention of claim 5, the guide rod eliminates the need for another structure for holding the water tank in the housing.
The structure of the washing machine is simplified.

[Brief description of drawings]

1A and 1B are enlarged cross-sectional views of a rubber body according to an embodiment of the present invention, in which FIG. 1A is an enlarged cross-sectional view of a first embodiment, and FIG.
An enlarged sectional view of the embodiment, (c) is a plan view thereof, and (d) is an enlarged sectional view of the third embodiment.

FIG. 2 is a cross-sectional view showing an overall schematic configuration of a fully automatic washing machine including a vibration prevention device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts of the vibration prevention device according to the first example of the present invention.

FIG. 4 is a cross-sectional view showing a state where grease leaks when a conventional rubber body is used.

[Explanation of symbols]

 1 Housing 2 Water Tank 3 Vibration Prevention Device 30 Guide Rod 31 Rubber Body 31c Through Hole 33 Coil Spring 34 Spring Bearing

Claims (5)

[Claims] 1. A washing machine, comprising: a vibration preventive device for preventing vibration generated in a water tank from being transmitted to an outer housing, the water tank having a longitudinal guide rod and a through hole through which the guide rod is inserted. A rubber body that slides and displaces along the guide rod when a load is applied from the coil body, a coil spring that expands and contracts by the rubber body that displaces along the guide rod, and is interposed between the guide rod and the rubber body. A lubricant and a tightening unit that changes the sliding resistance between the rubber body and the guide rod by tightening the rubber body according to the displacement content of the rubber body, and the guide rod is inserted into the rubber body. An anti-vibration device for a washing machine, characterized in that a recess for storing a lubricant is formed on the inner surface of the formed through hole. 2. The vibration preventing device for a washing machine according to claim 1, wherein the recess includes an annular recess extending in the inner circumferential direction of the through hole. 3. The vibration preventive apparatus for a washing machine according to claim 1, wherein the recess includes a recess groove extending in the axial direction of the through hole. 4. The vibration preventing device for a washing machine according to claim 1, wherein the recess includes a large number of fine recesses. 5. The guide rod is characterized in that it penetrates through a rubber body and extends upward, and the upper end thereof is attached to a housing and also serves as a water tank suspension rod.
The vibration prevention device for a washing machine according to any one of 1.