Abstract: A contamination-resistant bearing assembly includes an inner ring, an outer ring, a rolling unit, two contamination-resistant internal sleeves and two contamination-resistant external sleeves. The outer ring cooperates with the inner ring to define a bearing space where the rolling unit and the sleeves are disposed. The external sleeves are located at two opposite sides of the internal sleeves which are located at two opposite sides of the rolling unit in an axial direction. Each of the external sleeves includes a metal rigid shell and a sealing member.

Abstract: A dust-proof housing device is adapted for a bearing assembly and includes a housing body that includes two housing-half walls, each of which has a central hole defining an axis, and an inner peripheral end surrounding the central hole. A dust-proof cover has a fixing ring fitted in the inner peripheral end of at least one of the housing-half walls, and an annular flexible member secured to the fixing ring.

Abstract: A dust-proof housing device is adapted for a bearing assembly and includes a housing body that includes two housing-half walls, each of which has a central hole defining an axi s , and an inner peripheral end surrounding the central hole. A dust-proof cover has a fixing ring fitted in the inner peripheral end of at least one of the housing-half walls, and an annular flexible member secured to the fixing ring.