Abstract: In a vacuum cleaner beater brush structure, a beater brush roller is provided with a helical brush strip and a beater strip. A sprocket comprises a support flange and a gear pulley, the gear pulley comprising a carrier having brush tufts and beater bars, a step, a toothed array for engaging with the timing belt, the circular rib for preventing inflow of air containing dirt toward rotating portions of the structure, and an axle for supporting rotation of the structure and integrally formed therewith. A support pulley comprises a circular rib for preventing inflow of air containing dirt toward the rotating portion and an axle adapted for supporting rotation of the structure and integrally formed therewith. A pair of bearing mounts are coupled with the pulleys. The bearing mount comprises a rectangular supporter, a bearing housing portion for receiving an oil-filled sleeve bearing adapted to rotatably support the axle, and openings for allowing air containing dirt to flow therethrough.