JPH0824474A - Full automatic washing machine - Google Patents

Abstract

PURPOSE:To provide a vibration isolating device for full automatic washing machine in which the vertical vibration at dehydration start can be significantly reduced to provide a smooth starting, and the vibration and noise at steady operation can be also significantly reduced. CONSTITUTION:A suspension has a suspended bar 25, a spring support cylinder 28 mounted on the lower end of the suspended bar 25, and a cylindrical spring presser 26 inserted through the suspended bar 26 to cover the spring support cylinder 28. A friction member 30 is provided in the outer circumference of a slider 29 capable of sliding between the upper stopper 28a and lower stopper 28b provided on the spring support cylinder 28, and the friction member 30 is fitted to the inner wall of the spring presser 26 in such a manner as to be capable of sliding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a household automatic washing machine having a vibration isolator.

[0002]

2. Description of the Related Art Conventionally, a fully automatic washing machine of this type has a structure as shown in FIG. That is, the speed reducer 2 is fixed to the lower part of the outer tub 1 for receiving water at the time of dehydration,
The speed reducer 2 is connected by a belt to a motor 3 fixed to the lower portion of the outer tub 1. The drive shaft of the speed reducer 2 has a double structure, and a washing tub 4 located inside the outer tub 1 and also serving as a dehydration tub is fixed to the outer shaft. The inner shaft has
The stirring blade 5 located at the bottom of the washing tub 4 is fixed.
The outer tub 1 is vibration-supported from four corners of the main body 7 of the washing machine via the suspension 6.

The suspension 6 has a structure shown in FIG. A spherical receiving surface 10 is formed on the lower surface of the support piece 9 provided on the lower outer peripheral surface of the outer tub 1, and the lower portion of the suspension rod 8 is inserted through the through hole 11 formed in the receiving surface 10. Receiving surface 10
Projecting below. A spring receiver 12 is inserted and supported at a lower end portion of the suspension rod 8, a compression spring 13 is supported on the spring receiver 12, and a damper 14 is placed and supported on the compression spring 13.

The damper 14 has a flange 15a on its outer periphery.
Cylinder portion 15 having a large diameter and a receiving portion 16 having a large diameter at the upper end portion
a piston portion 16 having a, and a cylinder portion 15
The lower half of the inner peripheral surface of the piston is formed into a taper portion 15b having a smaller diameter toward the bottom, and the lower half of the piston portion 16 is also tapered corresponding to the taper portion 15b of the cylinder portion 15.
It is formed in b. A plurality of circular plate-shaped damper members 17 as shown in FIG. 7 are accommodated in the tapered portion 15b of the cylinder portion 15 in a stacked state. The damper member 17 is formed of a soft material such as felt, and the outer dimensions at the time of forming the damper member 17 are set to be slightly smaller than the inner diameter dimension of the upper portion of the cylinder portion 15 and larger than the minimum inner diameter dimension of the tapered portion 15b. The damper member 17 is impregnated with lubricating oil as a lubricant. The damper 14 is vertically movably inserted through the lower portion of the suspension rod 8 to mount and support the flange 15a of the cylinder portion 15 on the compression spring 13 and the receiving portion 16a of the piston portion 16 to form an outer tank. Supports 1. The damper member 17 in the cylinder portion 15 is reduced in diameter by being inserted into the taper portion 15b having a small diameter to tighten the suspension rod 8 and receive through the piston portion 16 the outer tub 1, the washing tub 4, and the motor. The suspension rod 8 is compressed by the weight of 3 or the like and is tightened to make frictional sliding contact with the suspension rod 8.

With the above structure, water supply, washing, drainage,
Centrifugal dehydration is performed automatically.

[0006]

Generally, in a fully automatic washing machine, when the spin-drying tub 4 is rotated and centrifugally spin-dried, a large vibration is generated due to the cloth imbalance W caused by the deviation of the clothes. In particular, the vibration amplitude becomes maximum at the time of starting and passing through the resonance point. In order to suppress this resonance vibration, in the above-described conventional structure, the damper 14 moves up and down, so that a frictional force acts between the damper member 17 and the suspension rod 8, and this becomes a damper force, which causes vibration. Is being attenuated. Further, in the conventional structure, as the amount of laundry increases, the damper member 17 is more strongly compressed and the pressure contact force to the suspension bar 8 becomes larger, so that a larger damper force is obtained and the vibration is greatly damped. Become. However, when the friction damping amount is increased, the amplitude at the resonance point is reduced, but on the other hand, the vibration is easily transmitted to the main body 7 of the washing machine, and the vibration of the main body 7 during steady operation, vibration noise, and sliding noise are generated. The noise such as becomes loud. On the contrary, if the frictional damping amount is small, the vibration and the noise during the steady operation are small, but the amplitude at the resonance point at the time of starting is large.

[0007] Therefore, the present invention is to solve the problems that the above-mentioned conventional structure has, and particularly to reduce the vibration at the time of starting and when passing through the resonance point, and at the same time reduce the vibration and noise during the steady operation. The first purpose is to obtain a fully automatic washing machine.

A second object of the present invention is to obtain a fully automatic washing machine which absorbs the shock when passing through the resonance point and enables a smooth dehydration start.

A third object of the present invention is to obtain a fully automatic washing machine in which a damping force is uniformly generated regardless of the amount of laundry and abnormal vibration is not generated particularly when the load is light.

[0010]

[Means for Solving the Problems] A first means for achieving the first object is an outer tub which is located outside a washing tub which also serves as a dehydrating tub and which receives water at the time of dehydration. Suspensions elastically supporting the outer tub from the four corners of the main body of the washing machine are provided. Each of the suspensions includes a suspension rod, a spring support cylinder attached to the lower end of the suspension rod, and upper and lower portions of the spring support cylinder. A slider (having a shape surrounding the spring support cylinder) slidably mounted between the provided stoppers (projections protruding outward at the end of the spring support cylinder) and the outer circumference of the slider. Friction material attached to the part,
It is composed of a tubular spring retainer that is inserted through the suspension rod and covers the spring support barrel, and a compression spring interposed between the spring support barrel and the spring retainer, and has both an upper stopper and a lower stopper of the spring support barrel. A damping force generating spring is provided between the sliders.

A second problem solving means for achieving the second object is that a hemispherical vibration isolator is formed between the slider and both the upper stopper and the lower stopper of the spring support cylinder, and the recess is in contact with each stopper. Thus, a plurality of grooves are radially provided on the surfaces of the upper stopper and the lower stopper, which come into contact with the vibration isolator.

A third problem solving means for achieving the third object is to straighten the spring restraint (make the inner diameter constant).
It is molded into.

[0013]

The first problem solving means operates as follows.
Until the dehydration tub begins to rotate and passes through the resonance point in the dehydration process, the dynamic amount of the outer tub is large, and accordingly, the spring restraint and the relative displacement of the suspension rod become large. At this time, by setting the distance between the stopper and the slider smaller than this displacement amount, the stopper suppresses the movement of the slider, and as a result, a damping force acts between the spring retainer and the friction material to reduce the vibration at the resonance point. ing. Further, since the damping force generating spring does not generate any damping force at all, there is no abnormal vibration when passing through the resonance point. Further, in a steady state, the sliding amount of the spring supporting cylinder is small and the dynamic amount of the outer tank is small. Along with this, the spring restraint and the relative displacement of the suspension rod are also small, and at this time, the distance between the stopper and the slider is larger than this displacement amount, so that the stopper cannot restrain the movement of the slider. As a result, the damper force does not act, the vibration is not transmitted to the main body of the washing machine, and the vibration and noise in the steady state can be suppressed to be small.

Further, according to the second means for solving the problems, the dynamic amount of the outer tank is large until the dehydration tank starts rotating and passes the resonance point in the dehydration process, and accordingly, the spring restraint and the suspension bar are relatively moved. Displacement becomes large. At this time, by setting the gap between the stopper and slider to be smaller than this displacement,
The stopper suppresses the movement of the slider, and as a result, a damping force acts between the spring retainer and the friction material to reduce the vibration at the resonance point. Further, the shock when the slider collides with the stopper is damped by the damping force generated when the hemispherical vibration isolator is deformed and the air in the recess is exhausted from the groove provided in the stopper. In addition, since the damping material acts as a spring and no damping force is generated in the suspension, there is no abnormal vibration when passing through the resonance point. Further, in a steady state, the sliding amount of the spring supporting cylinder is small and the dynamic amount of the outer tank is small. Along with this, the spring restraint and the relative displacement of the suspension rod are also small, and at this time, the distance between the stopper and the slider is larger than this displacement amount, so that the stopper cannot restrain the movement of the slider. As a result, the damper force does not act, the vibration is not transmitted to the main body of the washing machine, and the vibration and noise in the steady state can be suppressed to be small.

According to the third means, since the spring retainer is formed straight, the damping force due to the friction generated by the friction material and the spring retainer is constant even if the position of the spring support cylinder changes depending on the amount of laundry. Become.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. An outer tub 18 for receiving water at the time of dehydration is provided outside the washing tub 21 which also serves as a dehydration tub. A speed reducer 19 is fixed to the lower portion of the outer tub 18. The speed reducer 19 is connected by a belt to a motor 20 fixed to the lower portion of the outer tub 18. The drive shaft of the speed reducer 19 has a double structure, and a washing tub 21 located inside the outer tub 18 and also serving as a dehydration tub is fixed to the outer shaft. The inner shaft has a stirring blade 2 located inside the washing tub 21.
2 is fixed. The outer tub 18 is vibration-isolated from four corners of the main body 24 of the washing machine via suspensions 23a to 23d. As shown in FIG. 2, each of the suspensions 23a to 23d includes a suspension rod 25 and a cylindrical spring retainer 2 as shown in FIG.
6, a compression spring 27 and a spring support cylinder 28, and an upper stopper 28a and a lower stopper 28b on the upper and lower parts of the spring support cylinder 28, respectively. Reference numeral 29 is a slider provided between the upper stopper 28a and the lower stopper 28b of the spring support cylinder 28, and the friction material 30 is attached to the outer periphery thereof. The friction material 30 is slidably fitted to the inner wall of the cylindrical portion of the spring retainer 26. Reference numeral 31 is a damping force generating spring mounted between the slider 29 and both the upper stopper 28a and the lower stopper 28b. The amount of movement D of the friction material 30
Assuming that the distance between the upper stopper 28a and the lower stopper 28b is D'and the thickness of the slider 29 is d, the movement amount D is
D = D'-d, and the relative displacement of the spring retainer 26 and the suspension rod 25 until the dehydration tub 21 starts rotating and passes the resonance point in the dehydration process is D1, and the spring retainer 26 and the suspension rod in the steady state are When the relative displacement of 25 is D2, D2 <D <D1 is set.

The operation of this embodiment will be described below. Dehydration tank 2
During the centrifugal dehydration process in which 1 rotates, when the cloth imbalance W occurs due to the deviation of clothes or the like, the outer tub 18 and the dehydration tub 21 vibrate violently. Enter the dehydration process and dehydration tank 2
Until 1 starts rotating and passes the resonance point, the amount of jerk of the outer tub 18 is large, and accordingly, the relative displacement between the spring retainer 26 and the suspension rod 25 becomes large. At this time, the upper stopper 2
The distance D between the lower stopper 28b and the lower stopper 28b is set to be smaller than the displacement amount D1 so that the upper stopper 28a and the lower stopper 28b suppress the movement of the slider 29. As a result, the spring stopper 26 and the friction member 30 are separated from each other. A damper force is generated to suppress the vertical vibration of the outer tub 18 and reduce the vibration at the resonance point. Further, by the damping force generating spring 31, D>
Since the damping force does not occur even under the condition of D1, there is no abnormal vibration when passing through the resonance point.

Further, in the steady state, the amount of jerk of the outer tub 18 is small and the amount of sliding of the spring support cylinder 28 is small. Accordingly, the relative displacement between the spring retainer 26 and the suspension rod 25 is small,
At this time, since the distance D between the upper stopper 28a and the lower stopper 28b is larger than the displacement amount D2, the upper stopper 28a and the lower stopper 28b cannot suppress the movement of the slider 29. As a result, the damper force is not generated, the vibration is not transmitted to the main body 24 of the washing machine, and the vibration and noise in the steady state can be suppressed to be small.

Next, a second embodiment of the present invention will be described with reference to FIG. Each of the suspensions 23a to 23d is provided with a suspension rod 25, a cylindrical spring retainer 26, a compression spring 27 and a spring support cylinder 28, and an upper stopper 28a and a lower stopper 28b on the upper and lower parts of the spring support cylinder 28, respectively. There is. 29 is an upper stopper 2 of the spring support cylinder 28.
A friction member 30 is attached to the outer periphery of a slider provided between the lower portion 8a and the lower stopper 28b. The friction material 30 is slidably fitted to the inner wall of the cylindrical portion of the spring retainer 26. 32 is an upper stopper 28a and a lower stopper 2
A hemispherical vibration isolator attached between both 8b and the slider 29 so that the concave portions are in contact with the surfaces of the upper stopper 28a and the lower stopper 28b. Reference numeral 33 is a groove radially provided on the surfaces of the upper stopper 28a and the lower stopper 28b. The movement amount D of the friction material 30 is determined by the distance D ′ between the upper stopper 28a and the lower stopper 28b, and the slider 2
Assuming that the thickness of 9 is d, the movement amount D is D = D'-d, and the relative displacement between the spring retainer 26 and the suspension rod 25 until the dehydration tub 21 starts rotating and passes the resonance point in the dehydration process. Is D1, and the relative displacement of the spring restraint 26 and the suspension rod 25 in the steady state is D2, the setting is such that D2 <D <D1. The other structure is similar to that of the first embodiment.

The operation of this embodiment will be described below. Dehydration tank 2
During the centrifugal dehydration process in which 1 rotates, when the cloth imbalance W occurs due to the deviation of clothes or the like, the outer tub 18 and the dehydration tub 21 vibrate violently. Enter the dehydration process and dehydration tank 2
Until 1 starts rotating and passes the resonance point, the amount of jerk of the outer tub 18 is large, and accordingly, the relative displacement between the spring retainer 26 and the suspension rod 25 becomes large. At this time, the upper stopper 2
The distance D between the lower stopper 28b and the lower stopper 28b is set to be smaller than the displacement amount D1 so that the upper stopper 28a and the lower stopper 28b suppress the movement of the slider 29. As a result, the spring stopper 26 and the friction member 30 are separated from each other. A damper force is generated to suppress the vertical vibration of the outer tub 18 and reduce the vibration at the resonance point. Further, when the slider 29 collides with the upper stopper 28a and the lower stopper 28b,
The vibration damping material 32 formed in a hemispherical shape is deformed and buffered by the damping force generated when the air in the recess is exhausted from the grooves provided on the surfaces of the upper stopper 28a and the lower stopper 28b. Further, since the damping material 32 acts as a spring, no damping force is generated in the suspensions 23a to 23d, so that there is no abnormal vibration when passing through the resonance point.

Further, in the steady state, the amount of jerk of the outer tub 18 is small and the amount of sliding of the spring support cylinder 28 is small. Accordingly, the relative displacement between the spring retainer 26 and the suspension rod 25 is small,
At this time, since the distance D between the upper stopper 28a and the lower stopper 28b is larger than the displacement amount D2, the upper stopper 28a and the lower stopper 28b cannot suppress the movement of the slider 29. As a result, the damper force is not generated, the vibration is not transmitted to the main body 24 of the washing machine, and the vibration and noise in the steady state can be suppressed to be small.

Next, a third embodiment of the present invention will be described with reference to FIG. Each of the suspensions 23a to 23d has a suspension rod 25, a cylindrical spring retainer 26 formed straight, that is, d1 = d2, a compression spring 27 and a spring support cylinder 28, and upper stoppers 28a on the upper and lower portions of the spring support cylinder 28. , Lower stoppers 28b are provided. Two
Reference numeral 9 denotes a slider provided between the upper stopper 28a and the lower stopper 28b of the spring support cylinder 28, and the friction material 30 is attached to the outer periphery thereof. The friction material 30 is slidably fitted to the inner wall of the cylindrical portion of the spring retainer 26. 31 is
It is a damping force generation spring attached between the slider 29 and both the upper stopper 28a and the lower stopper 28b.
Assuming that the distance D between the upper stopper 28a and the lower stopper 28b is D'and the thickness of the slider 29 is d, the moving amount D of the friction material 30 is D = D'-d, and the moving amount D is released during the dehydration process. Assuming that the relative displacement between the spring retainer 26 and the suspension rod 25 until the water tank 21 starts rotating and passes through the resonance point is D1, and the relative displacement between the spring retainer 26 and the suspension rod 25 in the steady state is D2, D2 <D <D1. Is set to. The other structure is similar to that of the first embodiment.

The operation of this embodiment will be described below. Since the spring retainer 26 is formed straight, even if the position of the spring support cylinder 28 changes depending on the amount of laundry, the damping force due to the friction generated by the friction material 30 and the spring retainer 26 becomes constant.

[0024]

As described above, according to the first means, the friction material is attached to the slider slidably mounted between the stoppers provided on the upper and lower portions of the spring support cylinder, and the friction material is attached between the stopper and the slider. By interposing a spring between them,
It is possible to reduce vibration when passing through the resonance point and also reduce vibration and noise during steady operation.

The second means is to attach a friction material to a slider slidably mounted between stoppers provided on the upper and lower portions of the spring support cylinder, and form a hemispherical shape between the stopper and the slider. By interposing the molded anti-vibration material, it is possible to absorb the shock when passing through the resonance point and enable a smooth dehydration start.

The third means is that the spring restraint is formed straight so that the damping force is uniformly generated, and the occurrence of abnormal vibration, especially at light load, can be eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view of a fully automatic washing machine showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the same.

FIG. 3 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 5 is a side sectional view showing a conventional automatic washing machine.

FIG. 6 is an enlarged cross-sectional view of the vibration isolation portion.

FIG. 7 is a perspective view of a damper member provided in the vibration isolation portion.

[Explanation of symbols]

 18 Outer tub 21 Washing tub 23a, 23b, 23c, 23d Suspension 24 Main body of washing machine 25 Suspension bar 26 Spring retainer 27 Compression spring 28 Spring support cylinder 28a Upper stopper 28b Lower stopper 29 Slider 30 Friction material 31 Damping force generating spring 32 Protection Swing material

Claims (3)

[Claims] 1. An outer tub enclosing a washing tub, and a suspension for suspending and supporting the outer tub from four corners of a main body of a washing machine. Each suspension is provided with a suspension rod and a lower portion of the suspension rod. The spring support cylinder is provided, a tubular spring retainer that is inserted through the suspension rod and covers the spring support barrel, and a compression spring interposed between the spring support barrel and the spring retainer are provided. The cylinder has outer projections on both ends, and a slider surrounding the outer circumference of the spring support cylinder is slidably mounted between the both projections. A friction material is arranged on the outer circumference of the slider. A fully automatic washing machine in which a damping force generating spring is provided between both the upper and lower convex portions of the support cylinder and the slider. 2. A vibration damping material having a hemispherical shape and having a space inside is inserted between the respective convex portions of the spring support cylinder such that the concave portions of the vibration damping material face the convex portions, respectively. 2. The fully automatic washing machine according to claim 1, wherein grooves are radially provided on the surfaces of the upper end convex portion and the lower end convex portion of the spring supporting cylinder which the concave portion of the vibration isolator faces. 3. The fully automatic washing machine according to claim 1, wherein the cylindrical spring retainer has the same inner diameter from the upper end to the lower end.