Patent ID: 8979964
Filing Date: 2015-03-17
Classification: B01D,F02M

Abstract:
1. Filter element for an air filter of an internal combustion engine, wherein the filter element comprises: a first filter bellows with filter folds extending substantially in an axial expansion direction of the filter element and a first fold depth that extends in a plane substantially orthogonal thereto in the radial expansion direction; a second filter bellows with filter folds extending substantially in an axial expansion direction of the filter element and a second fold depth that extends in a plane substantially orthogonal thereto in the radial expansion direction; wherein the second filter bellows is arranged radially inwardly relative to the first filter bellows; wherein a depth of the second filter folds is deeper than a depth of the corresponding first filter folds; a conical annular flow passage is formed between a radially outer surface of the second filter bellows and a facing radially inner surface of the first filter bellows; wherein the conical annular flow passage extends from a first axial end of the first and second filter bellows to an opposing second axial end of the first and second filter bellows; wherein the radially outer surface of the second filter bellows and the facing radially inner surface of the first filter bellows are spaced radially apart, the radial spacing forming the conical annular flow passage therebetween; wherein the conical annular flow passage widens radially in the axial expansion direction from the second axial end to the first axial end; wherein the first filter bellows at a first axial end is provided with a shell that is shape-preserving relative to an outer edge of the first filter bellows.