Patent ID: 8402797

Claim:
A washing machine comprising: a cabinet; a tub made of plastic within the cabinet to hold water therein and having a side wall and a rear wall; a drum rotatably arranged in the tub; a shaft to transmit a driving power to the drum; a motor having a rotor and a stator, wherein the rotor is coupled to the shaft and the stator is at the rear wall of the tub; and a bearing supporting part holding a bearing to support the shaft at a central portion of the rear wall of the tub; a stator fastening part extending from the bearing supporting part in a radial direction and having a stator fastening hole to fasten the stator; a first circumferential rib extending in an axial direction directly from a front surface of the stator fastening part and spaced from the bearing supporting part; and a second circumferential rib extending in an axial direction directly from a rear surface of the stator fastening part and spaced from the bearing supporting part.