Tumble or swirl movement type variable aerodynamic generating device for e.g. diesel engine, has cylinder head with ducts, where one duct includes aerodynamic generating part having oval shape or in form of annular section

摘要

The device has a cylinder head (7) with intake ducts having same shape, where one duct (1`) comprises a downstream end communicating with a gas inlet valve (5) to the interior of a combustion chamber (11). The end has an annular bush (4) for the valve, and the duct has an aerodynamic generating part (10), where the part is disposed in upstream of a shoulder (104) and inserted between the bush and another shoulder (110) of the head. The part has oval shape or is in the form of annular section whose ends are bended to form an arc of circle in order to be placed in two cavities of the device.