Air duct orifice for reducing low frequency noise

Abstract

An air duct orifice includes an adapter pipe inserted in and attached to an end portion of an air duct connected to an engine side; an orifice pipe protruding from an outer surface of the adapter pipe; and an orifice cover coupled to an upper opening formed on the orifice pipe. The orifice pipe is disposed in a receiving opening formed on the air duct. The orifice pipe has engaging jaws on two side surfaces, and the orifice cover has combining holes on two side surfaces. The engaging jaws are engaged with the combining holes. The side surfaces of the orifice pipe without engaging jaws and the side surfaces of the orifice cover without combining holes are spaced apart from each other to form a radiation path of noise. The air duct orifice further includes a small resonator mounted to a lower side surface of the air duct.

Dependencies are inferred from the claim text.