Intake manifold having a swirl system for an internal combustion engine

摘要

An intake manifold (3) having a swirl system (14) for an internal combustion engine (1) provided with a number of cylinders (2); for each cylinder (2), the intake manifold (3) comprises an intake pipe (9) which is adapted to connect the intake manifold (3) to the cylinder (2) and comprises in turn two channels (10); for each intake pipe (9), the swirl system (14) comprises a choke valve (15) which is arranged within a channel (10) of the intake pipe (9) and is adapted to vary the air introduction section through the channel (10); each choke valve (15) presents a shaft (20) which is arranged through the channel (10) of the intake pipe (9), is rotationally mounted about a central rotation axis (21), and presents a first end (26) which extends externally to the channel (10); a butterfly valve plate (22) supported by the shaft (20); and a lever (27) fitted onto the shaft (20) at the first end (26) to transmit the rotation motion to the shaft (20) itself.