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Drum washing machine




Title: Drum washing machine.
Abstract: 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. ...


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USPTO Applicaton #: #20140109628
Inventors: Ui Kun Hwang


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

TECHNICAL FIELD

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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

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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.




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stats Patent Info
Application #
US 20140109628 A1
Publish Date
04/24/2014
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


Washing Machine Amper

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20140424|20140109628|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 |Dongbu-Daewoo-Electronics-Corporation