Variable damping type damper and washing machine having the same

摘要

A variable damping type damper and a washing machine having the same comprise: a cylinder of which one side is provided with a receiving space having a certain depth and another side thereof is coupled to the cabinet or the tub; a rod of which one side is relative-movably inserted into the receiving space of the cylinder and another side thereof is coupled to the cabinet or the tub; a guide bar provided at an end portion of the rod; a variable volume frictional means expanded and contracted in itself by a difference of flow amount introduced/ exhausted into/from an inner space by being coupled to the guide bar, and adhered/detached to/from an inner circumferential surface of the receiving space of the cylinder; a volume type slider performing a relative movement with the variable volume frictional means by being slidably inserted into the guide bar, for causing fluid flow inside the variable volume frictional means; and a frictional member fixedly coupled to the volume type slider for generating a frictional force with the inner circumferential surface of the receiving space of the cylinder. According to this, steady state vibration and transient state vibration generated from a tub assembly during an entire process for washing laundry are prevented from being transmitted to a cabinet, thereby minimizing noise leaked to outside. <IMAGE>