This air intake apparatus includes an air intake apparatus main body including a plurality of pieces bonded to each other along a split plane and an external gas passage formed inside the air intake apparatus main body by bonding the plurality of pieces to each other and including an external gas receiving port that directly receives external gas from a cylinder head and an external gas introduction port that introduces the external gas into a surge tank.

An intake manifold 10 includes: a surge tank 11 that is connected on an upstream side thereof to a throttle valve 13; multiple branch pipes 12 that are arranged side by side in a longitudinal direction of the surge tank 11 and respectively connected to cylinders; and a PCV chamber 15 that is provided upstream of a central part in the longitudinal direction of the surge tank 11. The intake manifold includes: a blowby gas introduction port 16g that is designed to introduce blowby gas into the PCV chamber 15; and a blowby gas exhaust port 16f that is designed to discharge the blowby gas from the PCV chamber 15 into the surge tank 11, and the blowby gas exhaust port 16f is located at a position higher than the blowby gas introduction port 16g.

An air intake passage (30) has a third passage (37) that connects an intercooler (36) and a bottom portion of a surge tank (38) such that the intercooler (36) is positioned below the surge tank (38). A pair of wall portions (71, 72) configured to catch moisture is formed in a section from an upstream end portion of the third passage (37) to a connected portion between said third passage (37) and the surge tank (38).

An air delivery system for an engine includes a first air filter, a second air filter, a first conduit, a second conduit, an air box, and a third conduit. Each of the first air filter and the first conduit, and each of the second air filter and the second conduit are disposed at a first angle with respect to a lateral axis of the air box. The first angle is adapted to limit restriction to flow of intake air from each of the first air filter and the second air filter toward the air box. The third conduit is disposed at a second angle with respect to a longitudinal axis of the air box. The second angle is adapted to limit restriction to the flow of intake air from the air box to the engine.

An intake duct for an internal combustion engine includes a tubular side wall. The side wall includes a first split body and a second split body that are separate from each other in a peripheral direction of the side wall. The first split body includes a rib that divides an inside of the side wall into passages and extends in an extending direction of the side wall. A distal end of the rib in a protruding direction of the rib is spaced apart from an inner surface of the second split body. A portion of the second split body opposed to the distal end is provided with a breathable part that allows air to flow between the inside and an outside of the side wall.

Methods and systems are provided for regulating airflow through a charge air cooler integrated in an intake assembly. In one example, an engine intake assembly comprises a plenum having an integrated charge air cooler (CAC), a first header seal positioned around a circumference of a first CAC header, and a first rotatably movable seal positioned in a bypass passage of the plenum. The first movable seal interfaces via sliding contact with the first header seal and adjusting a position of the first movable seal may vary the amount of airflow through the bypass passage.

An engine includes a plurality of cylinders, a gas chamber, and a heat shielding member. The plurality of cylinders are provided along a crankshaft. The gas chamber extends from a first end portion toward a second end portion in a direction of an axial line of the crankshaft and distributes gas into the plurality of cylinders. The heat shielding member is provided in the gas chamber. The heat shielding member extends from the first end portion toward the second end portion and shields heat radiated from an inner wall surface of the gas chamber.

An air intake apparatus includes an air intake apparatus body including an intake passage and a detection bore, a sensor holding portion holding a sensor, a pipe member constituted by an elastic member and including a first end and a second end, the first end being connected to the detection bore and the second end being connected to the sensor holding portion, the sensor holding portion including a fitting portion which includes an inner peripheral portion contactable with an outer peripheral portion of the second end, the sensor and the pipe member being fixed to the sensor holding portion by a contact of the outer peripheral portion of the second end with the inner peripheral portion of the fitting portion in a state where an insertion portion of the sensor is inserted to be positioned within the second end of the pipe member to widen the second end.

There is provided an internal combustion engine in which respective combustion states of cylinders can be uniformized with a simple configuration. A central axis (CL1) of a connecting part (7) of one of air supply ports (5) inclines with a predetermined inclination angle in a direction away from an air supply inlet (3) with respect to a y direction orthogonal to an x direction in which an air supply manifold 1 extends, and an inclination angle of the connecting part (7) of the one of the air supply ports (5) is larger than an inclination angle of the connecting part (7) of other air supply ports (5) located on a side closer to the air supply inlet (3) than the one of the air supply ports (5).

An air supply device for an internal combustion engine may include at least one air chamber and at least two intake pipes, which are connected to the at least one air chamber. The intake pipes may each be designed to supply air to respective cylinders of the internal combustion engine, and they each may have intake pipe end portion assigned to a corresponding inlet opening. Via the inlet openings, air can move from an air chamber interior of the at least one air chamber into respective intake pipe interiors of the at least two intake pipes and also via the intake pipe interiors to the cylinders. The intake pipe end portions may end in the air chamber interior and overlap in at least one direction, which is oriented perpendicularly to at least one center axis of at least one of the intake pipe end portions at a common overlapping region.