DAMPER OF WASHING MACHINE FOR REDUCING VIBRATION AND NOISE BY CHANGING WAVE FORM OF TRANSMISSION FORCE WITH DAMPING ACTION OF AIR CHAMBER

摘要

PURPOSE: A damper of a washing machine is provided to act high damping force by damping vibration of a tub with friction force of friction rings formed at a slider and an air chamber for excessive vibration with large displacement and to secure low damping force by acting only friction ring of the air chamber for normal vibration with small displacement. CONSTITUTION: A damper of a washing machine comprises a cylinder(102); a cylindrical air chamber(110) separated from the cylinder and composed of an air leakage hole(115) formed at one plate and at least one air passage(117,156) and air cut-off valve(118,155) formed at the other plate; a ring-shaped fixing member(120) mounted on the outer peripheral surface of the cylindrical air chamber; a first friction ring(121) fastened on the outer peripheral surface of the fixing member and contacted to the inside of the cylinder; a guide bar(130) having one end attached to the other plate of the air chamber and separated from the inner surface of the cylinder and the other end to which a piston(180) is extended; a slider(150) for covering the outer peripheral surface of the guide bar to slide by transmitted force and having at least one air passage and air cut-off valve; and a second friction ring(161) fixed on the outer peripheral surface of the slider and contacted to the inner surface of the cylinder.