JP2990909B2 - Washing machine anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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.

[0002]

2. Description of the Related Art In recent years, a washing machine which is provided with a mechanism for preventing vibration and can perform dewatering gently is mainly used.

[0003] A conventional dehydration washing machine is, as shown in FIG.
A washing tub and a dewatering tub 2 (hereinafter referred to as a dewatering tub) are provided inside a water tub 1 for storing water during washing. Many small holes 4 are provided. The water tank 1 is provided with a bearing box 5 and a motor 6. The motor 6 drives the driving force via a belt 7 and a pulley 8 so as to rotate only the pulsator 3 during washing and only the dewatering tank during dehydration. 5 Reference numeral 9 denotes a slider which is engaged with and supported by a support fitting 11 via a support rod 10, and at the same time, supports the water tank 1 via a spherical seat 12. Reference numeral 13 denotes a suspension provided inside the slider 9 and formed by a coil spring having an equal pitch. Reference numeral 14 denotes a balancer provided above the dewatering tank. If clothes are placed unevenly in the dewatering tub 2 during dehydration, the rotating objects become unbalanced, causing vibration.

A structure supported by a vibration isolating system such as a support rod 10 and a suspension 13 is called a vibration system. The vibration isolation system and the vibration system have a natural frequency. As the washing machine becomes larger and the washing weight increases as recently, when the frequency generated in the vibration system at the time of dehydration matches the natural frequency,
The amplitude of the vibration system becomes extremely large. For example, the water tank may vibrate up and down greatly, the rotating shaft may be damaged, and the whole product may move due to the impact force.

As an apparatus for suppressing such an amplitude, FIG.
There are the following. As shown in the figure, reference numeral 9 denotes a slider, and a through hole 9a is provided in the upper center in a slightly larger size than the diameter of the support rod 10, and the support rod 10 penetrates. A rubber cap 15 is provided below the support rod 10, and has a seal portion 15a on the outer periphery and a substantially annular spring 16 on the inner periphery.
Is in contact with the inner wall of the cylindrical part. The cap 15 is the support 1
0a. Reference numeral 13 denotes a suspension disposed between the inner surface of the slider 9 and the cap 15. Reference numeral 17 denotes a metal fitting for reinforcing the cap 15.

Next, the operation principle of the vibration isolator will be described. The vibration is transmitted to the slider 9 via the spherical seat 12 by the vibration of the water tank 1, and the slider 9 moves up and down. At this time, the air compressed by the cap 15 is supplied to the support rod 10 and the through hole 9.
The damping force is obtained by the resistance of the air leaking from the gap a and flowing in and out, thereby acting as a damper and performing vibration isolation together with the suspension 13.

[0007]

In such a conventional vibration damping device for a washing machine, the damping force can be obtained stably. However, if the gap between the through hole 9a and the support rod 10 is too large, the vibration penetrates during vibration. The hole 9a and the support rod 10 collided and made a loud noise.

An object of the present invention is to solve the above-mentioned problems, and to provide a stable damping force without generating a rattling sound to perform vibration isolation.

[0009]

According to the present invention, in order to achieve the above object, a water tub having a washing function in a washing machine main body is suspended and supported by a support bar via a suspension, and the support bar is penetrated and a cylindrical slider covers said suspension is provided, wherein held in the lower end of the support rod provided with a cap sliding in the slider airtight of the cap
A through hole larger than the diameter of the support rod is provided at the approximate center,
A support portion at the lower end of the support rod facing the cap.
And an air passage is provided between the support portion and the cap to allow a space formed by the slider and the support bar to communicate with the outside with a relatively small cross-sectional area.

[0010]

According to the present invention, the slider and the support rod can be neatly fitted to each other by the above-described structure, and another air passage having a stable flow area is provided. You can gain power.

[0011]

1 and 2 show an embodiment of the present invention.
This will be described with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and the description is omitted.

In FIG. 1, reference numeral 10 denotes a support rod for suspending and supporting a vibration system. The support rod 10 has a cap 15 at its lower end, and frictionally slides in an airtight manner with the inner wall of the slider 9 and a seal portion 15a. In contact. A suspension 13 is provided between the inner surface of the slider 9 and the cap 15. The free length of the suspension is set to such a length that the cap 15 slightly enters the lower end of the slider 9 when no load is applied. The support rod 10 penetrates through the through hole 9a provided in the large diameter, and the slider 9
Are fitted with almost no gap.

FIG. 2 is a perspective view of a support portion 10a of the support rod 10,
FIG. 3 is a perspective view of the support rod 10 and a state in which the support rod 10 has penetrated the cap 15. The support portion 10a is provided with an air groove 18 for an air passage, and the through hole 15b provided in the cap 15 is set slightly larger than the support rod 10. The air groove 18 for the air passage connects the space formed by the support rod 10, the cap 15, and the slider 9 to the outside, and its cross-sectional area has a resistance of an appropriate strength to the air flowing therethrough. The size is given.

The operation of the above configuration will be described. Aquarium 1
Vibration is transmitted to the slider 9 via the spherical seat 12 by the vibration of, and this moves up and down. At this time, the air compressed by the cap 15 leaks from the air groove 18 through the gap between the support rod 10 and the through hole 15b, obtains a damping force by the resistance of the air flowing in and out, and acts as a damper. Perform vibration isolation together.

As described above, according to the vibration damping device for a washing machine according to the embodiment of the present invention, the through hole 9a is set to have a large diameter of the support rod 10 and the air groove 18 is provided in the support portion 10a. A stable damping force can be obtained while preventing sound.

The position of the air groove 18 depends on the position of the cap 15.
It is sufficient if it is always lower than the lower side, and the cross-sectional shape may be any shape. However, it is necessary to be careful that if the cross-sectional area is too small, the slider 9 will act as an air spring and cause abnormal vibration without air inside.

Further, instead of providing the air groove, the same effect can be obtained by making the cross-sectional area of the support rod portion of the support portion smaller than the diameter of the through hole provided on the slider.

[0018]

As is apparent from the above description, according to the present invention, a water tub having a washing function is provided in a washing machine body.
Hanging support with a support rod through the pension, the support rod
Cylindrical slider penetrating through and covering the suspension
And the slider held at the lower end of the support rod
A cap that slides airtight inside is provided.
A through hole larger than the diameter of the support rod is provided in the center,
At the lower end of the support rod, a support part facing the cap
The slider and the cap between the support and the cap.
Relatively small gap between the space formed by the
Since the air passage communicating with the area is provided, it is possible to obtain a stable damping force without generating a rattling sound and perform vibration isolation. Therefore, even if the washing capacity is increased, it is possible to prevent the collision noise and the movement of the product during driving.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vibration isolator according to one embodiment of the present invention.

FIG. 2 is a perspective view of a support portion of the vibration isolator.

FIG. 3 is a perspective view of a main part of the vibration isolator.

FIG. 4 is a longitudinal sectional view of a conventional washing machine.

FIG. 5 is a longitudinal sectional view of a conventional vibration isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water tank 9 Slider 10 Support rod 13 Suspension 15 Cap 18 Air groove

Continuation of the front page (56) References JP-A-50-32779 (JP, A) JP-A-49-134964 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06F 37 / 20-37/24 F16F 15/06

Claims (1)

(57) [Claims] 1. A water tank having a washing function is suspended and supported by a support rod through a suspension in a washing machine body, and a cylindrical slider is provided through which the support rod penetrates and covers the suspension. the lower end is held in providing a cap sliding in the slider airtight of the cap
A through hole larger than the diameter of the support rod is provided at the approximate center,
A support portion at the lower end of the support rod facing the cap.
A vibration isolator for a washing machine having an air passage between a supporting portion and a cap, and a space formed by the slider and the supporting rod and the outside communicating with a relatively small cross-sectional area.