Patent ID: 8506664

Claim:
A filter pipeline for an internal combustion engine, the filter pipeline comprising: an air intake system having at least one pipe section conducting air flow into an internal combustion engine; a tubular body installed in said air intake system and connected to said at least one pipe section; an elongated flexible filter bag closed at one end, an opposing end of said filter bag having a rim surrounding an opening into an interior of said filter bag, said filter bag arranged within said tubular body and extending in a longitudinal direction of said tubular body, wherein said filter bag is made of a flexible material that is removably and replaceably attached in the area of said filter bag rim to said tubular body, wherein said filter bag and an inner wall of said tubular body are shaped such that in a circumferential direction of said filter pipeline different spacings are provided between said filter bag and said inner wall of said tubular body, wherein said inner wall of said tubular body has inwardly projecting ribs, said ribs providing said different spacings, and wherein said ribs radially space said filter bag away from said inner wall of the tubular body forming airflow spaces between said filter bag and said tubular body.