Drum washing machine

Abstract

A drum washing machine provided with a dynamic absorber capable of reducing the vibration of a low frequency band, the drum washing machine including a body, a drum rotatably installed at an inside the body, a tub installed to vibrate while surrounding the drum, and a dynamic absorber installed at the tub to directly reduce vibration delivered to the tub, wherein the dynamic absorber includes a mass body and an elastic member configured to elastically support the mass body for the mass body to move toward a direction of the vibration of the tub to reduce the vibration of the tub.

What is claimed is: 
     
         1 . A drum washing machine, comprising:
 a body;   a drum rotatably installed at an inside the body;   a tub installed to vibrate while surrounding the drum; and   a dynamic absorber installed at the tub to directly reduce vibration delivered to the tub,   wherein the dynamic absorber comprises:   a mass body; and   an elastic member configured to elastically support the mass body to move toward a direction of the vibration of the tub to reduce the vibration of the tub.   
     
     
         2 . The drum washing machine of  claim 1 , further comprising:
 a fixation bracket installed at the tub and configured to fix the elastic member,   wherein the fixation bracket comprises:   a first fixation bracket installed at one side of a rear side of the tub; and   a second fixation bracket installed while laterally opposing the first fixation bracket.   
     
     
         3 . The drum washing machine of  claim 2 , wherein the elastic member comprises:
 a first elastic member configured to connect between the first fixation bracket and the mass body; and   a second elastic member configured to connect between the second fixation bracket and the mass body.   
     
     
         4 . The drum washing machine of  claim 1 , wherein further comprises:
 a friction reducing part configured to minimize friction of the mass body that is moved by the elastic member.   
     
     
         5 . The drum washing machine of  claim 4 , wherein the friction reducing part comprises:
 a first slide rail formed at the tub;   a second slide rail installed at a bottom surface of the mass body to correspond to the first slide rail; and   a plurality of balls provided in between the first slide rail and the second slide rail.   
     
     
         6 . The drum washing machine of  claim 2 , wherein the mass body comprises a through-hole formed at a center thereof, and
 wherein the drum washing machine further comprises:   a shaft configured to pass through the through-hole of the mass body and connect in between the first fixation bracket and the second fixation bracket, and   a plurality of spherical members provided in between the shaft and the through-hole, so that the mass body slidably moves through the shaft and the plurality of spherical member.   
     
     
         7 . The drum washing machine of  claim 6 , wherein the mass body is elastically supported at one side and the other side thereof by the elastic member,
 wherein the elastic member is installed at an outer circumferential surface of the shaft, and comprises a first elastic member connectively installed at the first fixation bracket and a second elastic member connectively installed at the second fixation bracket.   
     
     
         8 . The drum washing machine of  claim 2 , wherein at least one of the first fixation bracket and the second fixation bracket comprises a hinge apparatus, and
 one side of the mass body is rotatably fixed by the hinge apparatus, and the other side of the mass body is movably installed so as to be moved in a direction toward left and right sides of the tub by the elastic member.   
     
     
         9 . The drum washing machine of  claim 1 , wherein the dynamic absorber further comprises:
 a casing to form an exterior of the dynamic absorber, fixed to the tub and being provided with the mass body at an inside thereof;   a plurality of elastic members fixed to the casing and the mass body to support the mass body; and   a friction reducing part configured to reduce friction of the mass body that is moved by the elastic member,   wherein the friction reducing part comprises oil provided at an inside the casing.   
     
     
         10 . A drum washing machine, comprising:
 a body;   a drum rotatably installed at an inside the body;   a tub installed to vibrate while surrounding the drum; and   a dynamic absorber installed at the rub to directly reduce the vibration delivered to the tub,   wherein the dynamic absorber comprises:   a mass body;   an elastic member to elastically support the mass body;   a fixation bracket installed at the tub and configured to fix the elastic member; and   a friction reducing part provided to minimize friction of the mass body that is moved by the elastic member.   
     
     
         11 . The drum washing machine of  claim 10 , wherein the dynamic absorber is movably installed at a rear side of the tub so as to be moved to a left and a right side of the tub to reduce a left-to-right vibration of the tub. 
     
     
         12 . The drum washing machine of  claim 10 , wherein the fixation bracket comprises a first fixation bracket installed at a rear side of the tub and a second fixation bracket installed while opposing the first fixation bracket. 
     
     
         13 . The drum washing machine of  claim 12 , wherein the elastic member comprises:
 a first elastic member configured to connect between the first fixation bracket and the mass body, and   a second elastic member configured to connect between the second fixation bracket and the mass body,   wherein the mass body is movably installed to move in a direction toward left and right sides of the tub by the plurality of elastic members.   
     
     
         14 . The drum washing machine of  claim 10 , wherein the friction reducing part comprises:
 a first slide rail formed at the tub;   a second slide rail installed at a bottom surface of the mass body to correspond to the first slide rail; and   a plurality of balls provided in between the first slide rail and the second slide rail.   
     
     
         15 . The drum washing machine of  claim 12 , wherein the mass body further comprises a through-hole formed at a center thereof, and
 wherein the drum washing machine further comprises:   a shaft configured to pass through the through-hole of the mass body and connect in between the first fixation bracket and the second fixation bracket, and   a plurality of spherical members provided in between the shaft and the through-hole, so that the mass body moves in a direction toward the left and the right side of the tub through the shaft and the plurality of spherical members.   
     
     
         16 . The drum washing machine of  claim 15 , wherein the mass body is elastically supported at one side and the other side thereof by the elastic member,
 wherein the elastic member is installed at an outer circumferential surface of the shaft, and comprises a first elastic member connectively installed at the first fixation bracket and a second elastic member connectively installed at the second fixation bracket.   
     
     
         17 . The drum washing machine of  claim 10 , wherein the fixation bracket comprises a plurality of elastic members configured to elastically support the mass body. 
     
     
         18 . The drum washing machine of  claim 1 , wherein the dynamic absorber further comprises:
 a casing to form an exterior of the dynamic absorber, fixed to the tub and being provided with the mass body having a disc-shape at an inside thereof; and   a plurality of elastic members fixed to the casing and the mass body to support the mass body.   
     
     
         19 . The drum washing machine of  claim 18 , wherein the casing is provided with a hollow core formed therein and has an open upper surface thereof, and wherein the dynamic absorber further comprises a panel coupled to the open upper surface of the casing to close the casing. 
     
     
         20 . The drum washing machine of  claim 19 , wherein the panel is formed with a transparent material. 
     
     
         21 . The drum washing machine of  claim 1 , wherein the mass body is elastically supported by a plurality of elastic members that are provided at a bottom surface of the mass body and includes at least one rubber column having a cylindrical shape. 
     
     
         22 . The drum washing machine of  claim 1 , wherein the dynamic absorber further comprises a hinge apparatus including at least one hinge link unit which includes a first hinge link rotatably connected to the tub and a second hinge link rotatably connected to the first hinge link and the mass body. 
     
     
         23 . The drum washing machine of  claim 1 , wherein the mass body includes a hole formed in the center of the mass body, and the elastic member is installed at the hole, wherein the elastic member includes a circular part formed in a shape of a ring and a supporting part connected in between the circular part and the mass body. 
     
     
         24 . The drum washing machine of  claim 1 , wherein the elastic member includes at least one of a spring or a rubber. 
     
     
         25 . The drum washing machine of  claim 1 , wherein the mass body is provided at a central portion of an upper surface thereof with a supportive protrusion connected to the elastic member and the elastic member includes at least one rubber band connectively installed to the supportive protrusion, and wherein the elastic member is connectively installed at the fixation bracket which is fixed to the tub, and the fixation bracket is provided at a predetermined height to allow the mass body to be suspended. 
     
     
         26 . The drum washing machine of  claim 1 , wherein the mass body is elastically supported by the plurality of elastic members that are provided at a bottom surface of the mass body, and the mass body includes at least one elastic member column. 
     
     
         27 . A drum washing machine, comprising:
 a body;   a drum rotatably installed at an inside the body;   a tub installed in a way to vibrate while surrounding the drum; and   a dynamic absorber installed at the tub to directly reduce vibration delivered to the tub,   wherein the dynamic absorber comprises:   a mass body provided with a hinge axis connecting part connectively formed thereto;   an elastic member configured to movably and rotatably support the mass body;   a fixation bracket installed at a predetermined position at an upper surface of the tub to fix the elastic member; and   a hinge apparatus installed at a predetermined distance from the fixation bracket to rotatably support the mass body,   wherein the hinge apparatus comprises:   a hinge bracket fixed to the tub;   a hinge groove having a hollow core and formed at an inside the hinge bracket; and   a hinge axis corresponding to the hinge groove, formed on the hinge axis connecting part and coupled to the hinge groove to fix the hinge axis connecting part to the hinge groove.