Device and arrangement having a filtering element for separating oil from the crankcase emissions of an internal combustion engine

A device for purifying a gas issuing from a crankcase of an internal combustion engine, comprising a filtering element arrangement that comprises:

• a filtering element which has an annular filtering medium that extends longitudinally around a central axis between a first axial face and a second axial face, the filtering medium having an internal face defining an inner space;
• a rotor element configured for rotating the filtering element, engaged in the inner space against a plurality of contact surfaces of the filtering element in an assembled state between the rotor element and the filtering element, the rotor element having a one-piece sleeve which extends longitudinally around the central axis in the assembled state and has an external face on which are formed N notches each defined between two longitudinal edges, the sleeve being suitable for insertion into the inner space;
• wherein the filtering element comprises a first flange covering the first axial face, the first flange comprising an anchoring part which extends longitudinally into the inner space around the sleeve, towards a second flange of the filtering element, first contact surfaces among said plurality of contact surfaces being spaced apart and formed by the anchoring part that provides N engagement means projecting radially inwardly for engaging the N notches in a fitted manner, N being an integer greater than or equal to two, the second flange comprising at least one retaining member engaged with the anchoring part and making it possible to render the first flange and the second flange integral in rotation
• and wherein the device further comprises:
• a rotational drive shaft which defines an axis of rotation and has an anchoring end for fixing the rotor element with the same alignment along the axis of rotation which coincides with the central axis of the filtering medium;
• a housing which has an inlet to admit untreated gases, an outlet to evacuate treated gases, and a passage for the drive shaft aligned with the axis of rotation, the anchoring end extending into the inner space being surrounded by a connecting portion of the rotor element;
• and
• two opposite abutment means formed respectively on the drive shaft and the rotor element, enabling the filtering element to be locked axially relative to the drive shaft when the rotor element is fixed to the anchoring end.