Abstract: A rotary valve includes: a valve chamber in which at least three ports including at least a first port, a second port, and a third port are disposed in a circumferential direction; at least three external flow paths communicating with the three ports, respectively; and a valve rotor accommodated in the valve chamber so as to be rotatable and configured to switch a flow of a fluid between the ports by a rotation operation. The first port extends in the circumferential direction of a wall portion of the valve chamber. A first buffer portion is formed between the first port and the external flow path corresponding to the first port. The first buffer portion covers the entire first port and serves as a space having a circumferential width larger than a circumferential width of a valve flow path.

Abstract: A rotary valve includes: a valve chamber in which at least three ports including at least a first port, a second port, and a third port are disposed in a circumferential direction; at least three external flow paths communicating with the three ports, respectively; and a valve rotor accommodated in the valve chamber so as to be rotatable and configured to switch a flow of a fluid between the ports by a rotation operation. The first port extends in the circumferential direction of a wall portion of the valve chamber. A first buffer portion is formed between the first port and the external flow path corresponding to the first port. The first buffer portion covers the entire first port and serves as a space having a circumferential width larger than a circumferential width of a valve flow path.

Abstract: An air intake apparatus of an internal combustion engine includes an intake passage, an intake air flow control valve, a housing portion configured to house the intake air flow control valve, a swirl opening arranged at a first side of the intake air flow control valve to generate swirl, and a tumble opening arranged at a second side of the intake air flow control valve to generate tumble. The swirl opening is provided at one of the intake air flow control valve and a portion between the intake passage and the intake air flow control valve, the tumble opening being provided at the other of the intake air flow control valve and the portion between the inner surface of the intake passage and the intake air flow control valve. The intake air flow control valve rotates to achieve a switching between a swirl state and a tumble state.

Abstract: A mounting structure of an air intake apparatus includes an air intake apparatus including a first mounting portion made of resin and a second mounting portion made of resin, a first collar member made of metal positioned within a first mounting bore at the first mounting portion, a second collar member made of metal positioned within a second mounting bore at the second mounting portion, and a large diameter annular portion made of metal provided between the first and second collar members, the first collar member, the large diameter annular portion and the second collar member being fastened while making contact with one another in a state where the first mounting portion and the second mounting portion are fastened together relative to the cylinder head by a fastening member inserted to be positioned within the first collar member, the large diameter annular portion and the second collar member.

Abstract: A mounting structure of an air intake apparatus includes an air intake apparatus including a first mounting portion made of resin and a second mounting portion made of resin, a first collar member made of metal positioned within a first mounting bore at the first mounting portion, a second collar member made of metal positioned within a second mounting bore at the second mounting portion, and a large diameter annular portion made of metal provided between the first and second collar members, the first collar member, the large diameter annular portion and the second collar member being fastened while making contact with one another in a state where the first mounting portion and the second mounting portion are fastened together relative to the cylinder head by a fastening member inserted to be positioned within the first collar member, the large diameter annular portion and the second collar member.