US Patent 10539103 Air intake device for internal combustion engine

An intake device for an internal combustion engine, the intake device includes: a housing constituting an intake passage; a valve element including a valve portion arranged to open and close a part of the intake passage, and thereby to strengthen an intake air flow; and a receiving portion which is formed on a bottom wall of an aeration passage of the housing, and which is recessed in an arc shape along a movement trajectory of the valve portion, the valve portion including an outer side surface which confronts a bottom surface of the receiving portion, which has an arc shape, and which includes a seal portion that has a raised shape, and that extends along an edge portion on an upstream side of an intake direction.