Abstract: A filter unit includes an air filter, which captures dust from intake air, and a cleaning unit, which automatically cleans the air filter. The cleaning unit includes a rotation brush, which removes dust from the air filter, and a dust box, which extends parallel to the rotation brush. The dust box includes a dust inlet that opens toward the rotation brush and receives dust from the rotation brush. The dust box is removable from the filter unit.

Abstract: An air filter cleaner includes a brush, which cleans an air filter. A case moves back and forth together with the brush, which is arranged on the case. A pinion moves the brush and case back and forth and is arranged in the case. A rack supports the pinion. The rack is arranged along a direction in which the brush moves back and forth and includes a side surface facing toward the case. A groove, which is arranged in the side surface of the rack, extends in the direction in which the brush moves back and forth. A flange, which extends from the case, engages with and slides in the groove. The engagement of the groove and flange restricts movement of the case in a direction perpendicular to the direction in which the brush moves back and forth.

Abstract: An air filter cleaner includes an air filter that captures dust. A brush cleans the air filter. A dust box collects dust from the brush. A rotary shaft rotates the brush. A moving mechanism moves the brush and the dust box using the rotation of the brush. A one-way clutch connects the brush and the rotary shaft.

Abstract: An air filter device including a base, air filter, and self-propelled cleaning unit. The base includes a frame defining an opening through which air is drawn. The air filter captures dust from the air passing through the opening. The air filter is fastened to the frame by a fastener and includes an filter surface. The self-propelled cleaning unit is coupled to the base, moves along the filter surface when cleaning the first air filter, and is located at a standby position on the frame of the base when in a non-cleaning state. The self-propelled cleaning unit, which includes a cleaning brush, a dust box, and a motor, lies away from the entire filter surface of the first air filter and the fastener when located at the standby position.

Abstract: A filter unit includes an air filter, which captures dust from intake air, and a cleaning unit, which automatically cleans the air filter. The cleaning unit includes a rotation brush, which removes dust from the air filter, and a dust box, which extends parallel to the rotation brush. The dust box includes a dust inlet that opens toward the rotation brush and receives dust from the rotation brush. The dust box is removable from the filter unit.