The purpose of the presented invention is offering the apparatus that make strong turbulence in the air flow introduced through the intake manifold to improve the combustion efficiency at the low speed of operation and reduce the streaming resistance to the air flow at the high speed of operation.
To acquire this purpose, the turbulence generator in the intake manifold 70 of this invention is controlled by electronic control unit 50 in the standard of a certain rotate rate of the engine A or the speed of vehicle in the one or reverse direction.
This invention is composed of the step motor 10 equipped with driving gear 11 on its rotating axis, ;

the shaft 20, sliding in the direction of the axis via the remarked rack gear 21 engaged with the remarked driving gear 11 by the operation of step motor 10, with the one tip inserted in the intake manifold 70 and the other tip, shaped into the rack gear 21, projecting out of the intake manifold 70 and extending, ;
the anchor 40 installed in the intake manifold 70 to support the sliding movement of the remarked shaft 20, ;
the turbulence generator 30 possessing multiple rotating fans 32 that are prepared to be able to rotate on the shaft 20 in the front of the remarked anchor 40 and to become fold or unfold when the remarked shaft slides in the direction of the axis according to the information of the engine operation and to rotate in virtue of the inhaled air flow in the unfold state. therefore at the low speed of operation the remarked rotating fans 32 spread and start to rotate gradually by virtue of the kinetic energy of the mixture gas passing the rotating fans 32, and make turbulence.