Abstract: The separator comprises an outer body of a generally cylindrical shape, having a flat bottom, with an upper tangential gas inlet and an axial gas outlet, in addition to a cylindrical collecting area and a lower storage area for the separated phase. A recessed inner body with rotational symmetry is movably mounted vertically in the outer body, and cooperates with the opening of the upper tangential gas inlet and/or with the start of the axial gas outlet, in such a way as to make the cross section of the gas passage variable according to the height position of the inner body. Application to oil-gas separation, in particular for recovering oil particles contained in the recycled crankcase gases of an internal combustion engine of a motor vehicle.

Abstract: This cyclone device performs diphasic gas-oil separation to remove oil from the recirculated crank cases of an internal combustion engine. Mounted such that it can move vertically inside the cyclone is a body (7) exhibiting symmetry of revolution, particularly one of cylindro-conical overall shape. The body (7) delimits, with the walls of the cylindrical collecting zone (2) and/or of the conical zone (3) for recuperating the liquid oil, an annular gap (13) such that the passage cross section can vary according to the self-adjusting heightwise position of the body (7), as a function of the gas flow rate. The speed of the gases thus remains constant for variable gas flow rates.

Abstract: The invention relates to an oil separator (1) for an internal combustion engine, for at least partially separating the oil from the gases exiting the crankcase of an internal combustion engine, which separator comprises a casing (10) containing therein: an inlet chamber (2) for the oil-laden gases; an outlet chamber (3) for the cleaned gases; at least one intermediate suction chamber (41, 42, 43); and an oil recovery chamber (5) with an opening (50) for returning the separated oil to the engine. The communication interface (53) between the oil recovery chamber (5) and the gas outlet chamber (3) is sized (Ll) in such a way that the pressures in each of the chambers (3, 5) are substantially equal during the use of the separator regardless of the gas flow rate inside said separator (1). The invention can be used in the field of motor vehicles.

Abstract: This cyclone device performs diphasic gas-oil separation to remove oil from the recirculated crank cases of an internal combustion engine. Mounted such that it can move vertically inside the cyclone is a body (7) exhibiting symmetry of revolution, particularly one of cylindro-conical overall shape. The body (7) delimits, with the walls of the cylindrical collecting zone (2) and/or of the conical zone (3) for recuperating the liquid oil, an annular gap (13) such that the passage cross section can vary according to the self-adjusting heightwise position of the body (7), as a function of the gas flow rate. The speed of the gases thus remains constant for variable gas flow rates.