JP3840734B2 - Drum washing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drum type washing machine for washing, rinsing, and dewatering laundry in a drum that is rotatably arranged around a substantially horizontal rotation axis.
[0002]
[Prior art]
Conventionally, this type of drum-type washing machine is configured as shown in FIGS. Hereinafter, the configuration will be described.
[0003]
As shown in FIG. 6, the rotating drum 1 is provided with a large number of water passage holes 2 on the entire outer periphery thereof, and is rotatably disposed in the outer tub 3. One end of the rotary shaft 4 is fixed in a substantially horizontal direction at the rotation center of the rotary drum 1, and a drum pulley 5 is fixed to the other end of the rotary shaft 4. The drive motor 6 is connected to the drum pulley 5 by a belt 7 and rotationally drives the drum 1.
[0004]
The outer tub 3 is suspended from the body 8 by a spring body 9 so as to be swingable, and the vibration-proof damper 10 reduces vibration at the time of dehydration start and supports vibration-proof so that vibration at the time of steady dehydration is not transmitted to the body 8. In addition, a weight 11 for reducing vibration during dehydration is provided. The substantially cylindrical packing member 12 connects the opening 14 of the outer tub 3 corresponding to the front opening 13 of the rotating drum 1 and the body front opening 15. A window 16 is provided in the body front opening 15 so as to be opened and closed.
[0005]
The heater 17 heats the washing water in the outer tub 3. The control device 18 controls operations of the drive motor 6 and the heater 17 and sequentially controls a series of processes such as washing, rinsing, and dehydration.
[0006]
The rotating shaft 4 fixed to the rotating drum 1 is supported by a bearing 19 and hermetically seals the outer tub 3 and the bearing 19 with an oil seal 20. The bearing case 21 accommodates the bearing 19 and the oil seal 20, is accommodated in the rear recess 3-a of the outer tub 3, and is fixed from the outer periphery by screws 22. The rear of the spring body 9 is hooked on a hook portion 21-b of the bearing case 21.
[0007]
In the above configuration, the operation will be described. When the window 16 is opened and the laundry is put into the rotary drum 1 and the operation is started, the rotary drum 1 is driven by the drive motor 6 at the first rotational speed N1 (about 53 rpm) in the washing process. ), The laundry in the rotary drum 1 is lifted and dropped onto the water surface. Thus, the washing process proceeds. In the rinsing process, the same operation as in the washing process is performed.
[0008]
In the dehydration process, the rotary drum 1 is rotationally driven at the second rotation speed N2 (about 1000 rpm), and the laundry is centrifugally dehydrated. At this time, if the laundry in the rotating drum 1 is shifted, that is, if an imbalance occurs, the rotating bodies such as the rotating drum 1 and the outer tub 3 vibrate (oscillate). The vibration of the rocking body is attenuated and is not transmitted to the body 8 by the vibration isolating mechanism of the vibration isolating damper 10 during steady dehydration. Further, the opening 14 of the outer tub 3 and the front opening 15 of the body 8 are connected by a substantially cylindrical packing member 12, but the substantially cylindrical packing member 12 bends due to the swinging of the swinging body. Thus, vibration is not transmitted to the body 8 through the substantially cylindrical packing member 12.
[0009]
[Problems to be solved by the invention]
In such a conventional configuration, since the bearing case 21 is fixed to the outer tub 3 only by the screw 22 at the outer peripheral portion, when the rocking body such as the outer tub 3 vibrates (oscillates), the oil seal 20 is caused by the vibration. There was a problem that the adhesiveness between the outer tub 3 and the outer tub 3 was lost, causing water leakage. Further, since the outer tub 3 is fixed only at the outer peripheral portion, there is a problem that the outer tub 3 and the drum 1 are misaligned, and the drum 1 and the packing member 12 are in contact with each other and wear. Further, when the oscillating body vibrates, there is a problem that a force is generated in the peeling direction between the bearing case 21 and the outer tub 3 and the outer tub 3 is deformed, or a substantially central portion vibrates and abnormal noise is generated. .
[0010]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to prevent water leakage, abnormal noise, and stress rupture of a mounting portion by fixing a bearing case to an outer tank with high accuracy and robustness.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a rotating drum having a rotating shaft in a substantially horizontal direction, an outer tub enclosing the rotating drum, a drive motor for rotating the rotating drum during washing and dehydration, and the outer drum. A body that accommodates the tank in a swingable manner, a bearing that pivotally supports the rotating shaft of the rotary drum, a bearing case that is provided behind the outer tank and has the bearing at a substantially central portion, the outer tank, and the bearing; An oil seal provided between the outer tub and the bearing, and a substantially donut-shaped outer tub reinforcing plate is fixed to a substantially central portion of the rear surface of the outer tub. The oil seal is configured to be in close contact with the rear surface of the outer tank by being fixed to the outer tank reinforcing plate at a substantially central portion, and the outer tank reinforcing plate is an inner periphery that is a substantially donut-shaped disk. And upper and lower from the inner periphery To consist and extending the flange portion, is attached by spot welding and the inner peripheral portion and the flange portion to the outer tub, the interval in the horizontal direction of the spot welding is larger than the distance apart of the flange portion of the disc It is a thing.
[0012]
As a result, the bearing case is securely fixed to the rear surface of the outer tub, the adhesion between the oil seal and the outer tub is improved, and water leakage can be prevented. In addition, by fixing the bearing case to the substantially central portion of the outer tank with the outer tank reinforcing plate, it is possible to prevent the misalignment between the outer tank and the rotating drum, thereby reducing the rotating torque of the rotating drum and preventing the packing member from being worn. I can plan. Furthermore, deformation of the outer tub and generation of vibration noise can be prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention includes a rotating drum having a rotating shaft in a substantially horizontal direction, an outer tub enclosing the rotating drum, a drive motor for rotating the rotating drum during washing and dehydration, A body that accommodates the outer tub in a swingable manner, a bearing that pivotally supports the rotating shaft of the rotary drum, a bearing case that is provided behind the outer tub and that has the bearing in a substantially central portion, the outer tub, and the bearing An oil seal that is provided between the outer tank and the bearing, and a substantially donut-shaped outer tank reinforcing plate is fixed to a substantially central portion of the rear surface of the outer tank. The oil seal is configured to be in close contact with the rear surface of the outer tub by being fixed to the outer tub reinforcing plate at a substantially central portion thereof , and the outer tub reinforcing plate is a substantially donut-shaped disk. Peripheral part and vertical direction from the inner peripheral part It consists of a extending the collar portion, is attached by spot welding and the inner peripheral portion and the flange portion to the outer tub, the interval in the horizontal direction of the spot welding, because of the greater than the distance apart of the flange portion of the disc , Oirushi - improved adhesion between Le and the outer tub can be prevented water leakage and can antiwear reduction and packing member of the rotary torque can be prevented misalignment between outer tub rotating drum, also, Separation of the bearing case and the outer tub in the vertical direction when the rocking body vibrates can be prevented by fixing the collar portion , and further, vibration is generated in the spot portion of the collar portion with respect to vibration in the horizontal direction of the rocking body. By dispersing the stress at the time, the strength of the mounting portion of the outer tank reinforcing plate can be improved.
[0014]
【Example】
An embodiment of the present invention will be described below with reference to FIGS. In addition, the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
[0015]
As shown in FIG. 1, the first motor (drive motor) 26 rotates or rotates the rotary drum 1 at a first rotation speed N1 (for example, 53 rpm) to perform washing or rinsing. The motor (drive motor) 27 dehydrates the rotary drum 1 by rotating it at a second rotation speed N2 (for example, 1000 rpm). The first motor 26 and the second motor 27 are constituted by induction motors, and are connected to a driven pulley 30 via belts 28 and 29, respectively.
[0016]
The driven pulley 30 has two types of reduction ratios. The first motor 26 is connected to a driven pulley 30a having a large reduction ratio via a belt 28, and the second motor 27 is reduced via a belt 29. It is connected to a driven pulley 30b having a small ratio, and is fixed to the other end of the rotating shaft 4 having one end fixed to the rotation center of the rotating drum 1. The control device 31 controls operations of the heater 17, the first motor 26, the second motor 27, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration.
[0017]
As shown in FIGS. 2 and 3, a substantially X-shaped bearing case 21 that accommodates a bearing 19 and an oil seal 20 that seals the bearing 19 forward in a substantially central portion is provided in the outer tub 3. A plurality of screws are fixed to a substantially doughnut-shaped outer tank reinforcing plate 23 fixed to a substantially central part, and a peripheral part is housed in the rear recess 3-x of the outer tank 3 and fixed by screws 22 from the outer peripheral direction. ing.
[0018]
To explain the operation in the above configuration, the window 16 is opened, the laundry is put into the rotary drum 1, the power switch (not shown) is turned on, and then the start switch (not shown) provided in the control device 31 is turned on. When the operation is started by operating, the water supply valve 40 operates to supply water, and when a predetermined water level is detected by a water level detection means (not shown), the water supply is stopped and the first motor 26 is driven. In the washing process, since the laundry contains water, the revolving drum 1 is rotationally driven by the first motor 26 at the first rotation speed N1 while supplying water, and the laundry in the revolving drum 1 is lifted to the surface of the water. Fall down.
[0019]
At this time, the heater 17 is energized and heated while controlling the washing water in the outer tub 3 at a substantially constant temperature. When the washing process ends, the drain pump 41 operates to drain the washing water in the outer tub 3. Thereafter, in the dewatering process via the rinsing process, the rotary drum 1 is rotationally driven at the second rotational speed N2, and the laundry is dewatered by centrifugation.
[0020]
When the rotating drum 1 is rotated at the second rotation speed N2 during the dehydration process, if the laundry in the rotating drum 1 is in an unbalanced state, the swinging body mainly composed of the outer tub 3 vibrates (swings). However, the vibration causes the rear surface portion of the outer tub 3 and the bearing case 21 to vibrate. The oil seal of the bearing case 21 is secured by the outer tub reinforcing plate 23 fixed to the substantially central portion of the outer tub 3. 20 and the rear surface of the outer tub 3 are in close contact with each other and can prevent water leakage.
[0021]
Further, by fixing the bearing case 21 at the substantially central portion with the outer tank reinforcing plate 23, it is possible to prevent the misalignment between the outer tank 3 and the rotary drum 1, and the first motor 26 and the second motor 26. The rotational torque of the motor 27 is reduced. Furthermore, wear of the packing member 12 can be prevented without contacting the substantially cylindrical packing member 12 fixed to the front and the rotary drum 1.
[0022]
Further, the outer tank reinforcing plate 23 is provided with a flange portion 23-b extending downward and upward of a substantially donut-shaped disk, and the inner peripheral portion 23-a and the flange portion 23-b are connected to those shown in FIGS. In this way, by fixing to the rear surface of the outer tub 3, it is possible to prevent the outer tub 3 and the bearing case 21 from being separated when the oscillating body vibrates.
[0023]
The outer tank reinforcing plate 23 is spot-welded to the outer tank 3 so that the spot position (n) of the collar part is positioned outside the spot position (m) of the inner peripheral part. As a result, the spot of the collar 23-b takes the force to peel off the outer tank reinforcing plate 24 when the oscillator vibrates in the left-right direction, and the strength of the mounting portion of the outer tank reinforcing plate 23 to the outer tank 3 is increased. Further improve.
[0024]
Further, as shown in FIG. 2, by forming a substantially annular stepped portion 3-c outside the fixed position of the outer tank reinforcing plate 23 on the rear surface of the outer tank 3, the vibration propagation on the rear surface of the outer tank 3 is It can be relaxed by the stepped portion 3-c, and the strength of the mounting portion of the outer tank reinforcing plate 24 can be improved and vibration noise can be prevented. Further, the vibration isolator 25 is interposed between the bearing case 21 and the rear surface of the outer tub 3, so that the vibration of the rear surface of the outer tub 3 is mitigated and vibration noise can be prevented.
[0025]
【The invention's effect】
As described above, according to the first aspect of the present invention, the rotating drum having the rotating shaft in the substantially horizontal direction, the outer tub enclosing the rotating drum, and the rotating drum rotating during washing and dewatering. A drive motor that allows the outer tub to be swingably housed, a bearing that pivotally supports a rotating shaft of a rotating drum, a bearing case that is provided behind the outer tub and has the bearing in a substantially central portion, An oil seal provided between the outer tub and the bearing for air-tightening the outer tub and the bearing, and a substantially donut-shaped outer tub reinforcing plate fixed to a substantially central portion of the rear surface of the outer tub The bearing case is fixed to the outer tank reinforcing plate at a substantially central portion thereof so that the oil seal is in close contact with the rear surface of the outer tank, and the outer tank reinforcing plate is substantially donut-shaped. The inner periphery of the disc, and It consists of a flange portion extending in the vertical direction from the peripheral portion, and the inner peripheral portion and the flange portion are attached to the outer tank by spot welding, and the interval in the horizontal direction of this spot welding is the disc interval. The oil seal and the rear surface of the outer tub can be securely adhered to each other when the swinging body vibrates to prevent water leakage, and the rotational torque of the outer tub and the rotating drum can be reduced and the packing member Wear can be prevented, and the vertical separation between the bearing case and the outer tub can be prevented by fixing the collar portion, and the stress applied to the spot portion can be dispersed against left and right vibrations. Reinforcement of the tank rear surface can be ensured by spot welding, which is relatively easy to process, and water leakage and noise can be prevented.
[Brief description of the drawings]
1 is a cross-sectional view of a drum type washing machine according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the drum type washing machine. FIG. 3 is an exploded perspective view of a rear surface of an outer tub of the drum type washing machine. FIG. 4 is a diagram showing an outer tub mounting structure of an outer tub reinforcing plate of the drum type washing machine. FIG. 5 is a plan view of an outer tub reinforcing plate of the drum type washing machine. FIG. 6 is a cross section of a conventional drum type washing machine. FIG. 7 is an exploded perspective view of the outer tub portion of the drum type washing machine.
DESCRIPTION OF SYMBOLS 1 Rotating drum 3 Outer tank 3c Stepping part 3x Recessed part 4 Rotating shaft 8 Body 19 Bearing 20 Oil seal 21 Bearing case 21a Inner peripheral part 21b Outer peripheral part 23 Outer tank reinforcing plate 23a Inner peripheral part 23b Brim part 25 Anti-vibration material 26 1 motor (drive motor)
27 Second motor (drive motor)

Claims (1)

A rotating drum having a rotating shaft in a substantially horizontal direction, an outer tub enclosing the rotating drum, a drive motor for rotating the rotating drum at the time of washing and dehydration, and a body for swingably housing the outer tub, A bearing that supports the rotating shaft of the rotating drum, a bearing case that is provided behind the outer tub and that has the bearing at a substantially central portion, and the outer tub and the bearing that are provided between the outer tub and the bearing. A substantially donut-shaped outer tank reinforcing plate is fixed to the substantially central portion of the rear surface of the outer tank, and the bearing case is fixed to the outer tank reinforcing plate at the substantially central portion. By doing so, the oil seal is configured to be in close contact with the rear surface of the outer tub , and the outer tub reinforcing plate includes an inner peripheral portion that is a substantially donut-shaped disk, and a vertical direction from the inner peripheral portion. An extended collar part, Attached by spot welding the peripheral portion and the flange portion to the outer tub, you Keru intervals in the horizontal direction of the spot welding, drum type washing machine is larger than the interval in the disc apart at the flange portion.

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