Air filter for internal-combustion engine of motor vehicle, has filter mat folded such that acoustically effective diagonal reflection surface and acoustically effective Helmholtz volumes are formed on raw-air side and/or pure-air side

摘要

The filter has a housing (14) provided with an air inlet (20) and an air outlet, and a filter element (16) e.g. filter mat, arranged in the housing. A raw-air side (22) is connected with the air inlet, and a pure-air side connected with the air outlet. The air sides are separated from each other, and the filter mat is folded such that an acoustically effective diagonal reflection surface (28) and acoustically effective Helmholtz volumes (26) are formed on the raw-air side and/or the pure-air side.