Patent ID: 7856957

Claim:
An intake manifold ( 3 ) with a swirl system ( 14 ) for an internal combustion engine ( 1 ) provided with a number of cylinders ( 2 ); the intake manifold ( 3 ) comprises, for each cylinder ( 2 ), an intake pipe ( 9 ), which is adapted to connect the intake manifold ( 3 ) to the cylinder ( 2 ) and comprises, in turn, two reciprocally parallel channels ( 10 ); the swirl system ( 14 ) comprises: for each intake pipe ( 9 ), a choking valve ( 15 ), which is arranged inside a channel ( 10 ) of the intake pipe ( 9 ) and is adapted to vary the air introduction section through the channel ( 10 ); and a single actuator device ( 16 ), which simultaneously and synchronically displaces all the choking valves ( 15 ) and is provided with a motor ( 17 ) and with a mechanical transmission system ( 18 ) which transmits the motion from the motor ( 17 ) to all the chocking valves ( 15 ); the intake manifold ( 3 ) is characterized in that: each choking valve ( 15 ) comprises an actuating lever ( 22 ) angularly integral with a pivotally mounted shaft ( 19 ) of the choking valve ( 15 ) itself; the mechanical transmission system ( 18 ) comprises a number of stiff connecting rods ( 24 ) which are reciprocally independent and separated, each of which reciprocally connects two actuating levers ( 22 ) of two adjacent choking valves ( 15 ); and the mechanical transmission system ( 18 ) comprises two stroke ends ( 33 ) which are arranged at opposite ends of the mechanical transmission system ( 18 ) and define the respective limit positions corresponding to the closing and maximum opening positions of the choking valves ( 15 ).