Patent ID: 8790431

Claim:
Air filter for an internal combustion engine comprising air filter housing ( 100 ), a preseparator ( 120 ), a filter element having a first flow face on one axial end of the filter element and a second flow face on an opposing axial end of the filter element, the filter element in the form of a multiple bellows filter comprising at least an outwardly positioned filter bellows and a filter bellows that is radially inwardly positioned thereto, the outwardly positioned filter bellows and the inwardly positioned filter bellows each extending from the inlet flow face to the outlet flow face; wherein one of the flow faces of the filter element is an inflow face; an annular ring-shaped flow opening extending through the second flow face into the interior of the filter element, the annular flow opening extending into an annular ring-shaped flow passage formed by an radially inner surface of the outwardly positioned filter bellows and a radially outer surface of the radially inwardly positioned filter bellows; a second flow opening extending through the first flow face and opening into a second flow passage formed by the radially inner circumferential surface of the inwardly positioned filter bellows; a third flow opening formed at the first flow face and opening into a third flow passage formed an adjacent wall of the filter housing and an outer circumference on the radial exterior of the outwardly positioned filter element; wherein the air filter housing ( 100 ) has a receptacle ( 101 ) for the filter element and comprises an unfiltered gas chamber area, wherein the unfiltered gas chamber area ( 102 ) is delimited relative to the air filter by the air filter housing ( 100 ) and relative to the filter element to be inserted by a wall surface or inflow face at the unfiltered gas side, wherein the preseparator ( 120 ) has an air outflow configuration ( 121 ), wherein the air outflow configuration corresponds with an inflow face of the filter element to be inserted, wherein the preseparator ( 120 ) comprises a cyclone arrangement ( 130 ) with a plurality of individual cyclones ( 140 ) each having an outflow path ( 148 ), wherein the outflow paths ( 148 ) are distributed relative to and oriented toward the inflow face of the filter element, wherein individual cyclones of the cyclone arrangement are positioned on the housing and aligned in a direction to direct their outflow paths directly towards and into a respective flow opening in the inflow face; wherein the receptacle ( 101 ) of the air filter housing ( 100 ) is designed to receive the filter element in the form of a multiple bellows filer.