Patent ID: 7637978

Claim:
An intake duct system for receiving air and supplying the air to an air cleaner, the intake duct system comprising a cyclone duct including a cyclone module for generating torque of the air, wherein the cyclone module comprises: a central shaft; a plurality of cyclone blades that are formed outward from the central shaft; and a turbulence preventing device that is formed at a downstream side of the central shaft of the cyclone module so as to prevent turbulence of the air that has passed the cyclone blade; wherein the turbulence preventing device comprises a body that comprises: an extension shaft extending from a distal end of the central shaft; and a conical end portion formed in a conical shape at a distal end of the extension shaft and gradually narrowing with a slant angle from the distal end of the extension shaft, wherein the cyclone blade, the central shaft, the extension shaft, and the conical end portion are aligned co-axially along a central axis of the body, and wherein the turbulence preventing device further comprises at least one blade that is formed in a spiral shape in the same direction as the cyclone blade at an exterior side of the body.