An intake duct for an internal combustion engine includes a plurality of segments coupled together into a tubular shape. The segments include at least a first segment and a second segment. The first segment is formed from a material harder than the second segment. The first segment includes a groove that extends in the extending direction in a portion coupled to the second segment and projections that project from one of two inner surfaces of the groove. The second segment is formed from a material that allows for elastic deformation. The second segment includes a rib. The rib extends in the extending direction and has a projection width that is less than the opening width of the groove. The rib is fitted into the groove so that the projections locally compress the rib in the width direction of the groove.

A cover covering an engine and an intake duct for introducing fresh air outside an engine room into a combustion chamber of the engine are provided in the engine room. The cover includes a top face cover portion covering the engine from above, and a side face cover portion covering the engine from the lateral side. The intake duct is disposed so as to be continuous to a side edge of the side face cover portion such that the intake duct covers the engine from the lateral side together with the side face cover portion.

An intake system of an engine including an intake manifold, which includes an intake air introducing pipe and a plurality of independent intake pipes, is provided. Each of the independent intake pipes has an arc shape surrounding the intake air introducing pipe from outside with a space. A first independent intake pipe is curved more in the cylinder lined-up direction than a second. From the side in the cylinder lined-up direction, the arc shape of the second independent intake pipe is more distant from the intake air introducing pipe. To a first member constituting part of the intake air introducing pipe, a second member is joined to form the arc shape of the first independent intake pipe. A third member disposed radially outward from the first member is joined to the second member to form the arc shape of the second independent intake pipe.

A flow control member for a vehicle includes a body, a plurality of mounting tabs, and a panel member. The body has an outer surface and an inner surface. An air passage through the body is defined by the inner surface. A plurality of mounting tabs extends outwardly from the outer surface of the body. Each of the mounting tabs is configured to receive a fastener to connect the flow control member to an intake passage of the vehicle. A panel member is disposed in the air passage. The panel member defines a plurality of openings therethrough.

An intake system of an engine including an intake manifold, which includes an intake air introducing pipe and a plurality of independent intake pipes, is provided. Each of the independent intake pipes has an arc shape surrounding the intake air introducing pipe from outside with a space. A first independent intake pipe is curved more in the cylinder lined-up direction than a second. From the side in the cylinder lined-up direction, the arc shape of the second independent intake pipe is more distant from the intake air introducing pipe. To a first member constituting part of the intake air introducing pipe, a second member is joined to form the arc shape of the first independent intake pipe. A third member disposed radially outward from the first member is joined to the second member to form the arc shape of the second independent intake pipe.

A resonator includes: an inner pipe having first openings penetrated into an outer peripheral surface thereof from an inner peripheral surface thereof and second openings spaced apart from the first opening; a first cover adapted to allow a first resonant space to be formed between the outer peripheral surface of the inner pipe and the inner peripheral surface thereof, the first resonant space communicating with the internal space of the inner pipe through the first openings; and a second cover adapted to allow a second resonant space to be formed between the outer peripheral surface of the inner pipe and the inner peripheral surface thereof, the second resonant space communicating with the internal space of the inner pipe through the second openings.

Piston engine updraft and downdraft air intake systems, having a heat exchanger core and first and second intercooler flange structures having the same pattern of bolt apertures. The updraft air intake system has an air inlet component with an air inlet flange bolted to and having the same pattern of bolt apertures as the first intercooler flange structure, with the assembly configured to be mounted over the engine intake manifold with the air inlet component below the heat exchanger core. The downdraft air intake system has an air distribution tray with distribution channels, and an air passage closure tray that mates with the air distribution tray to form air conduits with outlet ports configured to be connected to cylinder air intake ports, and an air tray distribution flange bolted to and having the same pattern of bolt apertures as the second intercooler flange structure.

In an air intake apparatus, a first joining position between an intermediate piece and a first piece in a vicinity of a base of a protrusion of the intermediate piece opposite to an intake port is misaligned along an intake air flow direction with respect to a second joining position between the intermediate piece and a second piece in the vicinity of the base of the protrusion of the intermediate piece.

In an air intake apparatus, a first joining position between an intermediate piece and a first piece in a vicinity of a base of a protrusion of the intermediate piece opposite to an intake port is misaligned along an intake air flow direction with respect to a second joining position between the intermediate piece and a second piece in the vicinity of the base of the protrusion of the intermediate piece.

A first piece forms a part of a surge tank. A second piece forms the surge tank together with the first piece. The first piece includes an introduction hole through which blow-by gas is introduced. The first piece includes a first flange fixed to the second piece. The second piece includes a second flange fixed to the first flange. A cover is located inside the surge tank. The cover defines, together with an inner surface of the surge tank, a gas passage extending from the introduction hole into the branch pipe. A part of the cover is sandwiched between the first flange and the second flange.