Patent ID: 7115156

Claim:
A filter system for filtering a flow of intake air for a combustion engine, said filter system comprising: a tubular housing having an inlet arranged in the housing for introducing unfiltered air to be cleaned by filtration, an outlet arranged in the housing for discharging clean filtered air, and an opening for changing the filter; a cover for closing the filter changing opening; and a filter arrangement between the inlet and the outlet such that air from the inlet must pass in a direction of flow through the filter arrangement to reach the outlet; wherein said filter arrangement comprises at least one prefilter, one main filter and one secondary filter arranged in axial succession in the direction of flow in the housing, and wherein the prefilter comprises at least two parallel cyclone separators, the main filter is an annular filter element, and the secondary filter is also an annular filter element, and wherein the main filter has a first end disk in the direction of flow which is closed and carries a handle, and the secondary filter has a second end disk in the direction of flow which is closed.