AIR FILTER ELEMENT Russian patent published in 1998 - IPC

FIELD: cleaning of air entering the internal combustion engine; ecology; cleaning the air from dust and aerosols. SUBSTANCE: device includes upper and lower end shields made from flexible material and provided with circular slots and inner circular projection in form of shaft; located between end shields is layer of corrugated filtering material and inner perforated metal cylinder; height of inner projection is equal to 0.04-0.10 of height of filter element; depth of outer slots is equal to 1.5-3.0 of depth of center slots and length of corrugations is equal to 0.90-0.96 of width of end shields. EFFECT: enhanced reliability of filter at considerable loads and low temperatures. 2 dwg