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Drum washing machine

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20140109628 patent thumbnailZoom

Drum washing machine


Disclosed herein is a drum washing machine including: a cabinet; a tub fillable with wash water; a drum receiving laundry therein; a motor at the rear of a lower portion of the tub; a balancer coupled to a front surface of the tub; a plurality of springs having one end coupled to the cabinet and another end coupled to an upper surface of the tub to support the tub; and a plurality of dampers having one end coupled to the cabinet and another end coupled to a lower surface of the tub, wherein the springs include one spring coupled to one side of the cabinet and another spring coupled to an opposite side of the cabinet, the one spring having a spring constant different from that of the other spring.
Related Terms: Washing Machine Amper

Browse recent Dongbu Daewoo Electronics Corporation patents - Seoul, KR
USPTO Applicaton #: #20140109628 - Class: 68140 (USPTO) -
Textiles: Fluid Treating Apparatus > Machines >Tumbling >Cage Type Tumbler Supports, Bearings Or Drive

Inventors: Ui Kun Hwang

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The Patent Description & Claims data below is from USPTO Patent Application 20140109628, Drum washing machine.

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TECHNICAL FIELD

The present invention relates to a drum washing machine, and more particularly, to a drum washing machine capable of decreasing vibrations by using a plurality of springs having different spring constants.

BACKGROUND ART

A washing machine uses power from an electric motor as main power and performs washing, rinsing, and dehydrating processes so as to remove stains on laundry. The washing machine includes an electric motor, which is a power apparatus, a mechanical part that transfers energy to the laundry, a controlling part controlling the washing process, a water supply apparatus, a water draining apparatus, and the like.

Washing machines are classified into agitator type washing machines, pulsator type washing machines, and drum type washing machines, depending on their washing scheme. The agitator type washing machine performs washing by horizontally rotating a spiral agitator at the center of a tub. The pulsator type washing machine performs washing using a water flow generated by rotating a disk shaped pulsator. The drum type washing machine performs washing using impact generated when the laundry is lifted by a lifter in the drum and then dropped into the wash water and detergent into the drum provided with several protrusion parts and then rotating the drum around a horizontal axis.

DISCLOSURE Technical Problem

In accordance with the related art, since spring constants of springs absorbing vibrations during rotation of the drum are the same, it is difficult to effectively decrease the vibrations.

Therefore, there is a need to solve such a problem.

The present invention is conceived to solve such problems of the related art, and an aspect of the present invention is to provide a drum washing machine capable of decreasing vibrations by using a plurality of springs having different spring constants.

Technical Solution

In accordance with an aspect of the invention, a drum washing machine includes: a cabinet; a tub in the cabinet and fillable with wash water; a rotatable drum in the tub and receiving laundry therein; a motor at the rear of a lower portion of the tub and generating power; a motor pulley connected to the motor; a drum pulley connected to the drum; a belt having one side wound around the motor pulley and another side wound around the drum pulley so that the motor rotates the drum; a balancer coupled to a front surface of the tub; a plurality of springs having one end coupled to the cabinet and another end coupled to an upper surface of the tub to support the tub; and a plurality of dampers having one end coupled to the cabinet and another end coupled to a lower surface of the tub, wherein the springs include one spring coupled to one side of the cabinet and another spring coupled to an opposite side of the cabinet, the one spring having a spring constant different from that of the other spring.

The spring constant of the one spring may be larger than that of the other spring.

The one spring may have a length greater than that of the other spring.

When the drum is not rotated, the one spring and the other spring may have the same length to support the tub.

The dampers may include one damper coupled to one side of the cabinet and another damper coupled to an opposite side of the cabinet, wherein the one damper has a frictional force different from that of the other damper.

The frictional force of the one damper may be larger than that of the other damper.

Advantageous Effects

In accordance with an embodiment of the present invention, since vibrations may be decreased using one balancer, the assembling process and the manufacturing cost may be decreased.

In addition, in accordance with an embodiment of the present invention, since movement of the tub is changed to a vertical direction during the dehydration cycle by the plurality of springs having different spring constants, vibrations of the tub may be effectively absorbed by the springs.

Further, in accordance with an embodiment of the present invention, since the movement of the tub is changed to the vertical direction during the dehydration cycle by the plurality of dampers having different frictional forces, vibrations of the tub may be effectively damped by the dampers.

Furthermore, in accordance with an embodiment of the present invention, when positions at which one spring and one damper are mounted are the same as each other, and positions at which another spring and another damper are mounted are the same as each other, a vertical direction change of the movement of the tub due to a spring constant difference between the springs and a frictional force difference between the dampers may be maximized, such that a damping rate for the vibrations of the tub may be further improved.

DESCRIPTION OF DRAWINGS

The above and other aspects, features and advantages of the invention will become apparent from the following detailed description in conjunction with the accompanying drawings, in which:

FIG. 1 is a side cross-sectional view of a drum washing machine in accordance with an embodiment of the present invention;

FIG. 2 is a perspective view of the drum washing machine in accordance with one embodiment of the present invention;

FIG. 3 is a front view of the drum washing machine in accordance with an embodiment of the present invention;

FIG. 4 is a bottom perspective view of the drum washing machine in accordance with an embodiment of the present invention; and

FIG. 5 is a view illustrating an operation state of the drum washing machine in accordance with an embodiment of the present invention.

BEST MODE

Hereinafter, a drum washing machine in accordance with an embodiment of the present invention will be described with reference to the accompanying drawings. In the present description, thicknesses of lines, sizes of components, or the like, illustrated in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

Further, the following terminologies are defined in consideration of the functions in the present invention and may be construed in different ways by the intention of users and operators. Therefore, the definitions of terms used in the present description should be construed based on the contents throughout the specification.

FIG. 1 is a side cross-sectional view of a drum washing machine in accordance with an embodiment of the present invention; and FIG. 2 is a perspective view of the drum washing machine in accordance with an embodiment of the present invention. FIG. 3 is a front view of the drum washing machine in accordance with an embodiment of the present invention; FIG. 4 is a bottom perspective view of the drum washing machine in accordance with an embodiment of the present invention; and FIG. 5 is a view illustrating an operation state of the drum washing machine in accordance with an embodiment of the present invention.

As illustrated in FIGS. 1 to 5, the drum washing machine 1 includes a cabinet 10 that forms an appearance of the drum washing machine 1, a tub 20 positioned between front and rear plates (based on FIG. 1) of the cabinet 10 and fillable with wash water, a rotatable drum 30 positioned in the tub 20 and receiving laundry therein, a driving part 40 generating power to rotate the drum 30, a balancer 50 coupled to a front surface of the tub 20, springs 60 that absorb vibrations of the tub 20, and a damper 70 that dampens the vibrations of the tub 20.

The front plate of the cabinet 10 is provided with a laundry entrance hole (not illustrated) through which laundry is introduced and discharged and a door (not illustrated) opening or closing the laundry entrance hole.

The tub 20 is mounted in the cabinet 20 and has a hollow cylindrical shape that is laid laterally. The rear of the laundry entrance hole has an opening hole (not illustrated).

An upper portion of the tub 20 is provided with a water supplying apparatus (not illustrated) that supplies the wash water into the tub 20 and a detergent housing (not illustrated) that supplies a detergent. The tub 20 has the rotatable drum 30 disposed therein.

The drum 30 has a hollow cylindrical shape that is laterally laid, similar to the tub 20, and includes opening holes (not illustrated) at the rear of the laundry entrance hole. The drum 30 has holes (not illustrated) in the side thereof so that the wash water filled in the tub 20 may be introduced thereinto and discharged therefrom and has a lifter on an inner circumferential surface thereof so as to move the laundry.

The driving part 40 generates the power to rotate the drum 30. The driving part 40 includes a motor 41, a motor pulley 42, a drum pulley 43, and a belt 44.

The motor 41 is disposed at the rear of a lower portion of the tub 20 (see FIG. 1) and generates the power. The motor pulley 42 is connected to the motor 41, the drum pulley 43 is connected to the drum 30, and the belt 44 has one side wound around the motor pulley 42 and the other side wound around the drum pulley 43.

A rotational force generated by the motor 41 is transferred to the motor pulley 42. Then, the rotational force is transferred to the drum pulley 42 at the rear of the drum 30 through the belt 44, and the drum 30 is rotated. The motor pulley 42 and the drum pulley 43 have grooves in central portions thereof to prevent the belt 44 from separating from the pulleys.

When an unbalanced mass occurs during rotation of the drum 30, vibrations inevitably occur. The balancer 50 includes a body having a predetermined mass and a housing having an internal space to guide movement of the body, in order to rapidly decrease these vibrations.

The balancer 50 is coupled to the front surface of the tub 20 (see FIG. 1). The reason why the balancer 50 is coupled to the front surface of the tub 20 as described above is to correspond to the motor 41 at the rear of the tub 20. That is, since the motor 41 having a weight is at the rear of the tub 20, the balancer 50 is positioned on the front surface of the tub 20 in order to eliminate a weight unbalance due to the weight of the motor 41.

The motor 41 is biased toward the left of the tub 40 (based on FIG. 4). The balancer 50 is positioned so that the center of gravity thereof is biased toward the right, opposite to the motor 41, to correspond to the biasing toward one side. Therefore, the tub 40 is horizontally balanced by biasing the motor 41 toward the left and biasing the center of gravity of the balancer 50 toward the right.

shape that enables the center of gravity thereof to be biased toward the right. The balancer 50 may also have another shape in addition to the above-mentioned shape as long as the center of gravity thereof is biased toward the right.

The springs 60 have an upper end coupled to an upper end portion of a side plate of the cabinet 10 and a lower end coupled to an upper surface of the tub 20. Therefore, the springs 60 support the tub 20 and absorb the vibrations of the tub 20 that occur at the time of a dehydration cycle.

The number of springs 60 is plural. The same number of springs 60 are mounted on the left and right of the tub 20 to absorb the vibrations generated due to horizontal and vertical movement of the tub 20. Although one spring 60 is mounted on each of the left and right of the tub 20 in the present embodiment, the present invention is not limited thereto.

The springs 60 are coupled to the upper surface of the tub 20 at a center of gravity of the tub 20. Here, the center of gravity of the tub 20 means the center of gravity when the balancer 50 and the motor 41 are mounted on the tub 20, rather than the center of gravity of only the tub 20 itself.

The spring 60 is positioned at the center of gravity of the tub 20 so that the tub 20 is balanced in the front-to-rear direction. In accordance with the present embodiment, the lower end of the spring 60 is coupled to the tub 20 at the center of gravity of the tub 20 in the front-to-rear direction, and the upper end of the spring 60 is coupled to the cabinet 10 at the same position in the front-to-rear direction as that of the lower end of the springs 60 (see FIG. 1).

Hereinafter, a spring 60 coupled to the left (based on FIG. 3) of the tub 20 is referred to as one spring 60A, and a spring 60 coupled to the right of the tub 20 is referred to as the other spring 60B.

In the present embodiment, a spring constant of one spring 60A is different from that of the other spring 60B. Here, the spring constant is a constant indicating a proportional relationship between a force acting on the spring and a change of length of the spring. As the spring constant becomes larger, a larger force is required to extend the spring. In the present embodiment, the spring constant is adjusted by the number of windings of the spring 60.

The spring constant of one spring 60A is larger than that of the other spring 60B. Therefore, when the same force acts on one spring 60A and the other spring 60B, the other spring 60B extends further, as compared with the one spring 60A.



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stats Patent Info
Application #
US 20140109628 A1
Publish Date
04/24/2014
Document #
14008440
File Date
03/27/2012
USPTO Class
68140
Other USPTO Classes
International Class
06F37/22
Drawings
6


Washing Machine
Amper


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