| 摘要 |
PCT No. PCT/EP93/03435 Sec. 371 Date Dec. 18, 1995 Sec. 102(e) Date Dec. 18, 1995 PCT Filed Dec. 7, 1993 PCT Pub. No. WO94/13389 PCT Pub. Date Jun. 23, 1994An air filter, in particular for cleaning the combustion air for internal combustion engines, having a cylindrical housing provided with an unfiltered air inlet and with a clean air outlet mounted substantially concentrically on one of the axial end faces of the housing. An extension tube, which extends into the housing, is provided at the clean air outlet; a center tube, which extends into the housing, is secured to the inner wall of the extension tube, and a metal-free filter insert is slid onto the center tube. The filter insert has a radial packing on its end face which faces the extension tube, and the opposite end face of the insert is closed. The radial packing is provided with a sealing bead which is freely movable in the radial direction. A metal-free safety cartridge optionally may be arranged inside the center tube.
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