Patent ID: 7971456
Filing Date: 2011-07-05
Classification: B29C,B29L,D06F

Abstract:
1. A tub assembly of a washing machine comprising: a front tub having an entrance formed in a front portion thereof for introducing laundry; a rear tub having a front portion vibration-welded to a rear portion of the front tub by a vibration-welding device and having a rear portion with a bearing housing provided therein; a drum provided within the front tub and the rear tub when the front tub and the rear tub are vibration-weldedly fastened; and a rotation shaft having a side connected to the drum and the other side passing through the rear portion of the rear tub, the rotation shaft comprising two support parts to be rotatably supported by two bearings provided within the bearing housing and an interference-proof part provided between the support parts and having an outer diameter smaller than an outer diameter of the support parts, wherein the interference-proof part is located to face one of the bearings to form a radial gap along a circumferential direction of the rotation shaft between the interference-proof part and one of the bearings when the front tub and the rear tub are vibration-weldedly fastened in order to prevent contact between the rotation shaft and the bearings.