An intake device of an internal combustion engine, includes: a plurality of intake ports which have outer walls and partition walls and are adjacent to each other via the partition walls; a valve body which is provided in each of the intake ports, and switches a flow path of the intake port by rotation around a rotation shaft; a holding member which is installed on each of the outer walls and the partition walls; and a rolling bearing which is mounted on at least one of the holding members, and supports the valve body to be freely rotatable, wherein the holding member includes a wall surface between the rolling bearing and the valve body in a direction in which the rotation shaft extends.

An intake manifold includes a passage wall portion having a first member passage wall portion provided at a first member, a second member passage wall portion provided at a second member, and an inner joint portion including a division point at which an inner joint portion is divided from an outer peripheral joint portion, the inner joint portion at which the first member passage wall portion and the second member passage wall portion are joined with each other. At least a part of the inner joint portion except for the division point is arranged at a height position closer to a middle part of a gas passage than the division point in a first direction in which the first member and the second member are opposed with each other.

An intake system of a vehicle includes: an intake manifold having a plurality of runners for supplying intake gas to a multiple-cylinder engine; a surge tank cover coupled to the intake manifold to define a surge tank communicating with the plurality of runners via the intake manifold; an intake air inlet formed on the intake manifold as a passage through which intake air flows into the surge tank; an intake outlet formed on the intake manifold as a passage through which intake air sequentially passing through the intake air inlet, the surge tank, and the plurality of runners, and is discharged to the engine as the intake gas; a gas inlet which is a passage formed on the intake manifold and selectively receiving recirculation exhaust gas; and a gas chamber formed on the intake manifold so that the recirculation exhaust gas flows in through the gas inlet.

An intake system of a vehicle includes: an intake manifold having a plurality of runners for supplying intake gas to a multiple-cylinder engine; a surge tank cover coupled to the intake manifold to define a surge tank communicating with the plurality of runners via the intake manifold; an intake air inlet formed on the intake manifold as a passage through which intake air flows into the surge tank; an intake outlet formed on the intake manifold as a passage through which intake air sequentially passing through the intake air inlet, the surge tank, and the plurality of runners, and is discharged to the engine as the intake gas; a gas inlet which is a passage formed on the intake manifold and selectively receiving recirculation exhaust gas; and a gas chamber formed on the intake manifold so that the recirculation exhaust gas flows in through the gas inlet.

An intake manifold includes a passage wall portion having a first member passage wall portion provided at a first member, a second member passage wall portion provided at a second member, and an inner joint portion including a division point at which an inner joint portion is divided from an outer peripheral joint portion, the inner joint portion at which the first member passage wall portion and the second member passage wall portion are joined with each other. At least a part of the inner joint portion except for the division point is arranged at a height position closer to a middle part of a gas passage than the division point in a first direction in which the first member and the second member are opposed with each other.

An air intake device includes: a valve body which includes a rotating shaft; a bearing member which rotatably supports the rotating shaft of the valve body; and an air intake port which includes a concave portion on which the bearing member is disposed, wherein the bearing member includes a positioning portion for positioning the bearing member with respect to the concave portion of the air intake port, facing surfaces which extend from the positioning portion along the concave portion of the air intake port and face each other in an inward radial direction of the rotating shaft with respect to the concave portion, with a gap therebetween, and protruding portions which protrude toward the concave portion of the air intake port from the facing surfaces and seal the gap.

An air intake device includes: an air intake port; and a valve that includes an elastically deformable seal portion disposed in Ha side end portion, and switches between flow paths of the air intake port by being turned around a turning shaft, wherein the side end portion of the valve is provided with a curved side end portion that extends from one end portion side to the other end portion side along an extension direction of the turning shaft while being curved.

An intake device of an internal combustion engine, includes: a plurality of intake ports which have outer walls and partition walls and are adjacent to each other via the partition walls; a valve body which is provided in each of the intake ports, and switches a flow path of the intake port by rotation around a rotation shaft; a holding member which is installed on each of the outer walls and the partition walls; and a rolling bearing which is mounted on at least one of the holding members, and supports the valve body to be freely rotatable, wherein the holding member includes a wall surface between the rolling bearing and the valve body in a direction in which the rotation shaft extends.

In this air intake apparatus, a plurality of respective air intake ports include sealing surfaces that include inner wall surfaces with which valve bodies come into contact at the closed positions of the valve bodies, and the rotation angles of valve bodies located on a side relatively close to a drive source from their open positions to their closed positions are larger than the rotation angles of valve bodies located on a side relatively opposite to the drive source when a plurality of valve bodies are rotated from their open positions to their closed positions.

The present air intake control valve includes a valve body and a seal portion being elastically deformable to seal between an inner wall surface of an air intake port and the valve body. The seal portion is formed in a bending configuration including a first hinge portion and a second hinge portion each serving as a supporting point upon elastic deformation of the seal portion. One of the first hinge portion and the second hinge portion is arranged at an upstream side of the air intake port and the other of the first hinge portion and the second hinge portion is arranged at a downstream side in a state where the valve body is at a closed position.