JP3110561B2 - Anti-vibration damper device for drum type washing machine - 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 damper for a drum type washing machine for washing and centrifugally dewatering a laundry by a drum which is driven to rotate about a horizontal axis.

[0002]

2. Description of the Related Art A conventional drum-type washing machine and a vibration-damping damper are configured as shown in FIGS. In the figure, reference numeral 1 denotes a drum having a large number of water passage holes 2 provided on an outer peripheral portion.
Reference numeral 3 denotes a water tank that contains the drum 1 and stores washing water. Reference numeral 4 denotes a motor for rotating and driving the drum 1, reference numeral 5 denotes a horizontal shaft having one end fixed to the rotation center of the drum 1, reference numeral 6 denotes a drum pulley provided at the other end of the horizontal shaft 5, and reference numeral 7 denotes a belt connecting the motor 4 and the drum pulley 6. is there. Reference numeral 8 denotes a spring body for suspending the water tank 3 from the main body 9, and reference numeral 10 denotes a weight provided in the water tank 3 for reducing vibration during dehydration. Numeral 11 denotes an anti-vibration damper for attenuating the vibration of the water tank 3. More specifically, as shown in FIG. 7, a cylinder 12, a piston 14 having a sliding member 13, a piston rod 15, a water tank 3 and a main body 9 are provided. Has attachment members 16 and 17 to be attached to the.

In the above configuration, the drum 1 is rotated at a low speed by the motor 4 during the washing process, and the laundry in the drum 1 is lifted and dropped on the water surface for washing. The rinsing step is performed in the same manner as the washing step. In the dehydration step, the drum 1 is rotated at a high speed to dehydrate the clothes.
At this time, when the clothes in the drum 1 are shifted, that is, imbalance occurs, the drum 1 and the water tank 3 vibrate. In particular, a large vibration caused by resonance at the time of starting dehydration is used by the vibration damper 11 having a very large buffering force. Thus, the vibration amplitude at the time of resonance is reduced.

[0004]

In the above-mentioned conventional drum type washing machine, when the clothes in the drum 1 are deviated during dehydration, the water tub 3 vibrates greatly. In particular, the water tank 3 vibrates extremely greatly due to resonance at the time of starting dehydration. The shock absorbing capacity of the conventional vibration damper 11 needs to be very large in order to prevent excessive vibration of the water tank 3 and suppress it to a predetermined vibration or less even with respect to a possible maximum imbalance of clothes.
Therefore, the vibration of the water tub 3 is very easily transmitted to the main body 9 via the vibration damper 11, and further, the large vibration is transmitted to the floor on which the washing machine is installed. As a result, the floor surface vibrates greatly, and in a wooden house, the whole house starts to vibrate and gives a user uncomfortable feeling.

[0005] Therefore, the present invention provides an anti-vibration damper having a variable shock absorbing capacity, which enables the water tank to be operated when dehydration is started and dehydration is stopped.
A first object is to surely suppress the amplitude and minimize the transmission of vibration to the floor surface during a predetermined spin-dry rotation.

[0006] A second object is to minimize the vibration transmitted to the floor surface at the time of predetermined spinning, and to reduce noise.
It is to eliminate the occurrence .

[0007] The third object is to ensure that a certain spinning speed is achieved.
It is to minimize the vibration transmitted to the floor .

A fourth object is to provide a highly reliable vibration damper.
It is to provide .

[0009]

In order to achieve the first object, a vibration-damping device for a drum-type washing machine according to the present invention comprises a drum provided with a water passage hole on the outer periphery, and a washing water containing the drum. , A motor that rotationally drives the drum, a main body that houses the water tub, a spring body that suspends the water tub from the main body, and an anti-vibration damper that is attached between the water tub and the main body to suppress vibration of the water tub. The anti-vibration damper includes a cylinder that forms an oil chamber, a buffer device that generates a buffering force including a piston and a piston rod, and a piston rod that is slidably held and mounted on the piston rod.
Engage or disengage the lock pin with the
Switch rod to locked or unlocked state
A rod holding device, and the rod holding device
Lock the piston rod in the resonance speed range at the start of the stroke.
Lock to the holding device, and then the final
In the area where the water rotation speed has been reached, the piston rod is
Unlock the holding device and then stop dehydration.
Holds the piston rod in the resonance rotation speed range during operation
Locks against the device and retains the piston rod.
The slidable range for the holding device is the dehydration stop of the drum.
The amplitude is set to be equal to or less than the amplitude of the water tank in the resonance rotation speed region at the time of the transition .

According to another aspect of the present invention, there is provided an anti-vibration damper device for a drum type washing machine, comprising: a rod holding device;
Restricts the sliding position when the piston rod slides
A bias spring is provided.

[0011] The third anti-vibration damper device for a drum-type washing machine the present invention in order to achieve the purpose of, the Soviet Union the lock pin
Driven by a solenoid, the solenoid plunger and
The lock pin is fastened by a joint made of resin material
Things.

According to another aspect of the present invention, there is provided an anti-vibration damper for a drum type washing machine, comprising: a rod holding device;
A pair of bearings sandwich the notch of the piston rod
A pair of bearings and a notch in the piston rod
The distance between the parts should be greater than the slidable range of the piston rod.
It is a thing.

[0013]

According to the first aspect of the present invention, there is provided a drum-type washing machine having a new prevention device.
At the time of dehydration stop transition, the rotation of the drum becomes smaller,
When the number is reached, the vibration amplitude of the tank increases again,
Reduces vibration transmitted to the floor at a constant spin rate
The piston rod by the rod holding device.
In a locked state. However, the water tank when dehydration is stopped
Piston to prevent excessive vibration of the
Engage the lock pin with the notch of the rod and
Must be locked. By the way, Piston Ro
The slidable range of the pad is the water when the spinning of the drum is stopped.
Lock pin must be piston
The rod passes over the notch of the rod,
The ston rod can be locked. to this
To prevent excessive vibration of the water tank when stopping dehydration
And excessive vibration of the water tank at the next start of dehydration
Movement can be reliably prevented.

In the vibration damper device for a drum type washing machine according to the second aspect of the present invention, the vibration is transmitted to the floor at a predetermined rotation speed.
To reduce vibration, the piston is
It has a lock de an unlocked state. At this time, the piston
The rod is slidable.
The stone gradually falls, and finally exceeds the slidable range
When the piston rod hits the bottom and generates loud noise
In addition, the vibration transmitted to the floor surface becomes very large. But
However, in this configuration, when the piston rod is unlocked,
Always keep the piston rod in a fixed position with ias spring
I'm putting a little force on it. Therefore, piston piston
No longer hits the bottom when unlocking the pad
And vibration transmitted to the floor can be greatly reduced.

The third vibration damping device for a drum type washing machine according to the present invention transmits to the floor surface at a predetermined spinning speed.
Plunger by solenoid to reduce vibration
Drive the lock pin through the joint
Is unlocked. At this time, joint
Is made of resin material, the magnetic force of the solenoid is
Blocked and lock pin and piston rod are sucked
There is no. For this reason, always securely unlock the piston rod.
It is possible to switch to the locked state,
And ensure that vibrations transmitted to the floor are minimized.
You.

The fourth vibration-damping device for a drum type washing machine according to the present invention is arranged so that the piston rod can slide freely.
Rod holding device requires piston rod bearing material
Between the bearing material and the notch in the piston rod.
The distance is longer than the slidable range of the piston rod.
Notch when the piston rod is free to slide.
Does not reach the bearing material. Because of this, the piston
Notched part of rod shaves or damages bearing material
And a highly reliable vibration damper can be realized.

[0017]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2, reference numeral 18 denotes a main body of a drum-type washing machine; 19, a clothes input lid provided on the front surface of the main body 18 so as to be openable and closable; and 20, a drum 21 rotatably driven around a horizontal axis. A water tank for storing, 21a is a water passage hole provided on the outer periphery of the drum 21, 22 is a horizontal shaft which penetrates the water tank 20, and has one end fixed to the rotation center of the drum 21, 23 is a drum pulley provided at the other end of the horizontal shaft 22, 24 Is a motor for driving the drum pulley 23, 25 is a belt connecting the motor 24 and the drum pulley 23, 26 is a spring body for suspending the water tank 20 on the main body 18, 27 is attached between the water tank 20 and the main body 18 to attenuate vibration. This is a vibration damper, and in the present embodiment, the buffer capacity is arbitrarily variable between a large state and a small state. 28 is a water tank 2
A weight for suppressing the vibration of 0, 29 is a heater for heating the washing water, and 30 is a control device, which controls the motor 24, the vibration damper 27, the heater 29 and other operations. Reference numeral 31 denotes a vibration detection device provided in the water tank 20, and in this embodiment, the vibration amplitude is detected by using an acceleration sensor.

As shown in detail in FIG. 3, the vibration damper 27 is composed of a cylinder, a piston and a piston rod, which generates a buffering force, a sliding mechanism for slidably mounting the piston rod, and a dewatering device. It comprises a rod holding device that locks the piston rod at the start of the stroke and locks the piston rod after passing through the resonance state. In the shock absorber, a piston rod 35 is inserted from one end side of a cylinder 32 forming an oil chamber through an oil seal 33 and a rod guide 34, and a distal end of the piston rod 35 is provided on an inner peripheral surface of the cylinder 32. The sliding piston 36 is fixed, and the inside of the cylinder 32 is defined as two oil chambers. The piston 36 has a buffering oil passage 37. An attachment member 38 for attaching to the water tank 20 is fixed to one end of the cylinder 32.

The rod holding device 40 slidably holds the other end of the piston rod 35,
A mounting portion 39 is provided for mounting the device. An E-ring 41 is attached to the end of the piston rod 35 inserted into the rod holding device 40, and a notched portion 42 having a tapered shape is formed in the piston rod 35 closer to the middle than the E-ring 41. ing.

A solenoid 43 is attached to the side of the rod holding device 40, and a lock pin 46 is attached to a plunger 44 of the solenoid 43 via a joint 45 made of a resin material. The lock pin 46 is engageable with the notch 42 of the piston rod 35, and the tip is tapered. The lock pin 46 is engaged with the notch 42 by an urging spring 47, and normally the piston rod 35 is locked, and the solenoid 43 is unlocked by energizing the solenoid 43.

With the above configuration, a lock mechanism for locking and unlocking the piston rod 35 and the rod holding device 40 is configured. The rod holding device 4
In the sliding portion of the piston rod 35, a notch 42
A pair of bearing members 48a, 48b is provided sandwiching this, and constitutes a sliding mechanism for sliding the piston rod 35 extremely lightly.

A lock pin bearing 49 made of a resin material is provided on the lock pin sliding portion of the rod holding device 40. Further, on both sides of the E-ring 41, bias springs 5 for restricting the sliding position of the piston rod 35 when the piston rod 35 slides are provided.
0a and 50b are provided.

The relationship among the vibration detecting device 31, the control device 30, and each part is as shown in the block diagram of FIG.

The slidable range L of the piston rod 35 in the unlocked state is equal to or larger than the water tank amplitude Lt when the drum 21 is in a constant dehydration state. Further, the slidable range L of the piston rod 35 is set to be equal to or less than the water tank amplitude Ls when the drum 21 is shifted to the stop of dehydration. A pair of bearing members 4
The distance S between 8a, 48b and the notch 42 of the piston rod 35 is set to be equal to or more than the slidable range L of the piston rod 35.

Next, the operation of this embodiment will be described. When the washing is started, a predetermined amount of water is supplied to the water tub 20, and the heater 29 is energized until the temperature reaches a predetermined temperature. At this time, the drum 21 is driven to rotate at a low speed by the motor 24, and the clothes in the drum 21 are lifted and dropped on the water surface for washing. After the washing process, the washing water is drained and rinsed a predetermined number of times, and the rinsing process ends. In the dehydration process, the drum 21
Is driven at high speed by a motor 24 to perform centrifugal dehydration of clothes. At the start of dehydration, the anti-vibration damper 2 is controlled by the
7 is in a locked state, and the buffer capacity is large. That is, in this embodiment, as shown in FIG. 5A, the solenoid 43 is not energized, the lock pin 46 is engaged with the notch 42 of the piston rod 35 by the biasing spring 47, and the vibration damper 27 is large. Operate as an oil damper with frictional force. In this state, the resonance frequency of the water tank 20 is allowed to pass, so that excessive vibration of the water tank 20 at the time of resonance can be prevented. Thereafter, when a predetermined rotation speed of about 400 rpm is reached, the output of the vibration detecting device 31, that is, the vibration of the water tank, is detected, and the final spinning rotation speed is determined based on the vibration amplitude of the water tank 20 at this time.

The solenoid 43 shown in FIG.
And the anti-vibration damper 27 is unlocked. When the final dehydration rotation speed in the dehydration steady state is reached, the slidable range L of the piston rod 35 is equal to or larger than the water tank amplitude Lt at the predetermined dehydration rotation speed of the drum 21. Vibration is caused by a weak resistance force, and it is possible to greatly reduce vibration transmitted to the floor surface via the vibration damper 27.

At the time of the dehydration stop transition, that is, when the dehydration process is completed and the energization of the motor 24 is stopped, the rotation of the drum 21 gradually decreases. When the rotation of the solenoid 43 is stopped when the predetermined rotational speed of about 400 rpm is reached,
The lock pin 46 is moved by the urging spring 47 to the piston rod 3.
Energized to 5. At this time, there is a situation where the positional relationship between the notch 42 of the piston rod 35 and the lock pin 46 does not match. In this case, the anti-vibration damper 27 cannot be locked. However, when the rotation speed of the drum 21 further decreases and approaches the resonance state, and the vibration amplitude of the water tank 20 increases, the slidable range L of the piston rod 35 is changed to the water tank amplitude L at the time of shifting to the dehydration stop.
Since the length is not more than s, the positional relationship between the notch 42 of the piston rod 35 and the lock pin 46 always coincides with each other, and the engagement with the notch 42 of the piston rod 35 can be achieved. Accordingly, the vibration damper 27 can be reliably locked, and excessive vibration of the water tank 20 in the resonance state at the time of shifting to the dehydration stop can be prevented.

Further, since the anti-vibration damper 27 is already in the locked state at the time of the next dehydration start, excessive vibration of the water tank 20 at the time of the dehydration start can be surely prevented.

When the vibration damper 27 is locked, the notch 42 of the piston rod 35 and the tip of the lock pin 46 are tapered, so that the width of the notch 42 of the piston rod 35 is large. Lock pin 4
6 has a smaller tip dimension. For this reason, the lock pin 46
Can be easily engaged with the notch portion 42 of the piston rod 35, excessive vibration of the water tank at the time of shifting to dehydration stop can be prevented, and excessive vibration of the water tank 20 at the next activation of dehydration can be prevented. Can also be reliably prevented.

In the locked state after the engagement of the lock pin 46, the lock pin 46 can be fitted into the notch portion 42 of the piston rod 35 without a gap, and the play between the lock pin 46 and the piston rod 35 can be prevented. This makes it possible to eliminate the generation of noise.

At a predetermined spinning speed, the piston rod 35 is unlocked by the rod holding device 40 in order to reduce the vibration transmitted to the floor. At this time, the piston rod 35 is slidable, and the piston 36 gradually falls due to vibration during dehydration, and finally exceeds the slidable range, and the piston rod 35 hits the bottom, generating loud noise. At the same time, the vibration transmitted to the floor becomes very large. However, the rod holding device 40
Are provided with bias springs 50a and 50b for limiting the sliding position of the piston rod 35 when the piston rod 35 is slidable. When the piston rod 35 is unlocked, the bias springs 50a and 50b are provided.
A small force is applied by a and 50b so that the piston rod 35 is always at a fixed position. Therefore, the bottom contact at the time of unlocking the piston rod 35 is eliminated, and noise and vibration transmitted to the floor can be greatly reduced.

In order to reduce vibration transmitted to the floor at a predetermined spinning speed, the lock pin 4 is connected to the lock pin 4 via the plunger 44 and the joint 45 by the solenoid 43.
6 is driven to bring the piston rod 35 into an unlocked state. At this time, since the joint 45 is formed of a resin material, the magnetic force of the solenoid 43 is cut off and the lock pin 46 and the piston rod 35 are not attracted.
For this reason, the piston rod 35 can always be reliably brought into the unlocked state, and the vibration transmitted to the floor at the predetermined spinning speed can be reliably minimized.

In order to make the piston rod 35 slidable, the rod holding device 40 is provided with a piston rod 35.
Bearing members 48a and 48b are required. Bearing material 4
Since the distance S between the notches 8a and 48b and the notches 42 of the piston rod 35 is set to be equal to or more than the slidable range L of the piston rod 35, the notches 42 are used as the bearing members 48a and 48b when the piston rod 35 can slide. Never reach. For this reason, the notch 42 of the piston rod 35 does not cut or damage the bearing members 48a, 48b, and a highly reliable vibration damper can be realized.

Further, when the piston rod 35 is locked, the lock pin 46 receives a large vertical force through the piston rod 35. At this time, since the lock pin bearing material 49 made of a resin material is provided on the sliding portion of the lock pin 46, even if there is a slight gap between the lock pin 46 and the lock pin bearing material 49, it is generated. The noise can be kept extremely low.

[0035]

As described above, according to the present invention, in the drum type washing machine, the slidable range of the piston rod of the vibration damper is set to be equal to or smaller than the amplitude of the water tank when the dehydration stop of the drum is shifted.
The water tank amplitude when dehydration starts and when dehydration stops.
Therefore, it is possible to realize a structure for surely suppressing the pressure.

Further, the present invention provides a vibration damper having a rod holding member.
The holding device controls the sliding position of the piston rod when it slides.
By providing a bias spring to limit
The number of vibrations transmitted to the floor is minimized,
Can be eliminated.

Further, according to the present invention, a lock pin
The solenoid is driven by a solenoid, and the solenoid plunger
And the lock pin are fastened with a joint made of resin material.
This ensures that the floor surface is
The vibration transmitted to the fin can be minimized.

Further, according to the present invention, the rod holding device of the vibration damper is provided with a pair of bearing members sandwiching the notch portion of the piston rod, and the distance between the pair of bearing members and the notch portion of the piston rod is the piston. By making the rod slidable or higher, a highly reliable configuration is realized. The notch of the piston rod of the vibration damper and the tip of the lock pin are tapered so that the amplitude of the water tank at the start of dehydration and at the transition to dehydration stop is reliably suppressed, and the generation of noise is eliminated.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a drum type washing machine according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the drum type washing machine.

FIG. 3 is a detailed cross-sectional view of a main part of an anti-vibration damper of the drum type washing machine.

FIG. 4 is a block diagram showing a control configuration of the drum type washing machine.

FIGS. 5 (a) and 5 (b) are cross-sectional views of main parts showing an operating state of a vibration damper of the drum type washing machine.

FIG. 6 is a side sectional view showing a drum type washing machine in a conventional example.

FIG. 7 is a sectional view of an anti-vibration damper of the drum type washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 18 Main body 20 Water tank 21 Drum 27 Vibration damper 30 Control device 31 Vibration detection device 35 Piston rod 36 Piston 40 Rod holding device 42 Notch 43 Solenoid 44 Plunger 45 Joint 46 Lock pin 48a, b Bearing material 49 Lock pin bearing material 50a, b bias spring

Continued on the front page (72) Katsuaki Yoshida 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. ) Inventor Rue Fuse 2601 Komakawa, Matsubara, Asaba-cho, Iwata-gun, Shizuoka Prefecture Inside the Asa Plant, Showa Seisakusho Co., Ltd. 56) References JP-A-57-208333 (JP, A) JP-A-4-77881 (JP, A) JP-A-62-838 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 37/20-37/24 F16F 9/00-15/00

Claims (4)

(57) [Claims] 1. A drum having a water passage hole on an outer periphery thereof, a water tank containing the drum and storing washing water, a motor for rotating and driving the drum, a main body containing the water tank, and suspending the water tank from the main body. A spring body, and a vibration damper attached between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper generates a buffering force including a cylinder, a piston, and a piston rod forming an oil chamber. If, when holding said piston rod slidably together, the piston
Engage or disengage the lock pin with the notch on the rod.
To lock or unlock the piston rod.
A rod holding device for switching to
In the resonance speed range at the start of the dehydration process, the piston
Lock the rod to the rod holding device, and then
In the region where the final spinning speed has reached, the piston rod
To the rod holding device, and then
The piston rod should be
The piston rod is locked against the rod holding device,
The slidable range of the rod holding device is
Of the water tank in the resonance rotation speed region at the time of dehydration stop
Anti-vibration damper for drum type washing machine as below . 2. A drum having an outer periphery provided with water holes, a water tank containing the drum and storing washing water, a motor for rotating the drum, a main body containing the water tank, and suspending the water tank from the main body. A spring body, and a vibration damper attached between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper includes a cylinder forming an oil chamber and a piston at one end.
That generates a buffering force consisting of a piston rod provided with
The device and the other end of the piston rod are slidably held
In the resonance speed range at the start of the spin-drying process.
Lock the ton rod and then final dehydration during dehydration
Unlock the piston rod in the area where the rotation speed has been reached.
A piston rod holding device, and the other end of the piston rod
And two bias bars in the axial direction with the other end interposed therebetween.
Are provided between the rod holding device and the two
The other end of the piston rod is locked by a bias spring.
An anti-vibration damper for a drum-type washing machine which is held at a fixed position in an axial direction in a pad holding device . 3. A drum having an outer periphery provided with water holes, a water tank containing the drum and storing washing water, a motor for driving the drum to rotate, a main body containing the water tank, and suspending the water tank from the main body. A spring body, and a vibration damper attached between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper generates a buffering force including a cylinder, a piston, and a piston rod forming an oil chamber. And holding the piston rod slidably and engaging the lock pin with a notch provided in the piston rod at the start of the dehydration process to lock the piston rod,
A rod holding device for unlocking the piston rod after passing through the resonance state, wherein the lock pin is
Driven by the solenoid, and the plunger and lock of the solenoid
Kupin is an anti-vibration damper for drum type washing machines fastened by a joint made of resin material . 4. A drum provided with a water passage hole on the outer periphery, a water tank containing the drum and storing washing water, a motor for rotating the drum, a main body containing the water tank, and suspending the water tank from the main body. A spring body, and a vibration damper attached between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper generates a buffering force including a cylinder, a piston, and a piston rod forming an oil chamber. And slidably hold the piston rod, and the piston
By engaging the lock pin with the notch in the rod
The piston rod is locked and passed the resonance state
After that, hold the rod to unlock the piston rod
A piston rod.
A pair of bearing materials is provided with the notch of
Distance between the pair of bearing material and the notch of the piston rod
Is an anti-vibration damper for a drum type washing machine with a piston rod slidable range or more .