US 5,730,769 AGranted

Air filter with scaling bead freely movable in the radial direction

AssigneeFilterwerk Mann & Hummel GmbH

InventorsGuenter Dungs, Peter Fischer, Klaus Moessinger, Guenter Thaller

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Abstract

An 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.

Claims20

Dependent claims

An air filter for cleaning combustion air for an internal combustion engine, said filter comprising a substantially cylindrical housing having an unfiltered air inlet arranged substantially tangentially on an outer jacket surface of the housing and a clean air outlet arranged substantially concentrically at one axial end face of the housing;

an extension tube arranged concentrically at the clean air outlet and extending interiorly into the filter, said extension tube having an inner wall to which a center tube extending further into the housing is attached;
and a substantially metal-free filter insert disposed surrounding the center tube, said insert having a first axial end face facing the extension tube and provided with a radial, freely moveable sealing bulge extending axially away from said first axial end face in a direction opposite the filter insert and forming a radial seal in sealing contact with a surface of the extension tube, and said insert having a second axial end face which is closed.

Dependencies are inferred from the claim text.