Abstract: The inner barrel of the drum washing machine depends on the two deep groove ball bearings support on the outer barrel, and the inner barrel is driven by the motor. During the washing stage, the inner barrel rotating at a low speed, the load from the low was brought to a higher position, and then at a certain angle was thrown out of the beat, to remove the stain; in the spin stage, the inner barrel rotates at a high speed, load and water separation under the action of centrifugal force. As the core component of the transmission, the bearing has been in a rotating state throughout the whole process of washing. In this paper, the service life of the bearing is calculated through the force analysis of the related components, which provides the basis for the selection of bearing.

Key words: Bearing, Force analysis, Fatigue life, Type selection