Abstract: A washing machine provided with a balancing device which may suppress variation in horizontal vibration of a spin basket without performing control operation. The balancing device includes a ring-shaped casing installed to be concentric with the spin basket, and a plurality of the balancing balls and a viscous fluid. A ring-shaped ball accommodation portion, a fluid accommodation portion provided at a lower inner side of the ball accommodation portion in a radial direction of the ball accommodation portion, and a communication channel are formed in the casing. The fluid accommodation portion is provided at a portion of the casing along a circumferential direction of the casing. A bottom surface of the ball accommodation portion is inclined downward such that the balancing balls gather at the opposite position facing the fluid accommodation portion when rotation of the spin basket is stopped.

Abstract: Disclosed is a ball balancer that increases a rate of balls in ball detention portions and restricts aggravation of unbalance caused by balls outside of the ball detention portions. When a rotation speed of a rotator is less than a first rotation speed, the ball detention portion allows the ball moved from a rolling face to be detained therein and to allow the ball therein to come into contact with the released ball outside thereof to prevent separation of the released ball from the rolling face. Anti-separation portions are provided to come into contact with the released balls outside of the ball detention portions to prevent separation of the released balls from the rolling face. When the rotation speed is greater than the first rotation speed, the ball detention portion allows separation of the ball therein to the rolling face by centrifugal force applied thereto.

Abstract: A washing machine provided with a balancing device which may suppress variation in horizontal vibration of a spin basket without performing control operation. The balancing device includes a ring-shaped casing installed to be concentric with the spin basket, and a plurality of the balancing balls and a viscous fluid. A ring-shaped ball accommodation portion, a fluid accommodation portion provided at a lower inner side of the ball accommodation portion in a radial direction of the ball accommodation portion, and a communication channel are formed in the casing. The fluid accommodation portion is provided at a portion of the casing along a circumferential direction of the casing. A bottom surface of the ball accommodation portion is inclined downward such that the balancing balls gather at the opposite position facing the fluid accommodation portion when rotation of the spin basket is stopped.