Dana Corporation

Roland V Lanier

Edward Allen Covington

James Michael Glazewski

David William Ager

Gary U Hovis

Walter A Zemaitis

Air filter elements with primary filter medias have foam pre-cleaners with an increased surface area provided by an upstream face which has peaks and valleys. In one embodiment, the peaks and valleys are defined by parallel ribs. If the filter element is a panel-type filter element having a pleated primary filter media, then, in accordance with one embodiment, the pre-cleaner is secured to the primary filter media by adhesive deposits on the peaks of the primary filter media. If the filter element is annular, the pre-cleaner is also annular and is slid axially over a perforated sleeve or screen on the primary filter media and held thereon by friction. By having the upstream surface of the foam pre-cleaner configured in peaks and valleys, the surface area of the upstream surface is increased substantially, which improves the capacity, efficiency and life of the filter element.

Air filter elements with foam pre-cleaners

An arrangement for an air filter includes in one embodiment an air filter housing having a removable portion and a base portion with the base portion having an annular shoulder and the removable portion having a conical diffuser. A frustoconical filter element having a hollow core and annular seals at opposite ends is mounted in the housing. The annular seals have radially facing sealing surfaces which seal with the annular shoulder and with the diffuser. In another embodiment, the conical diffuser is mounted on a stanchion which is unitary with the base portion of the air filter housing. The frustoconical filter element is mounted on the base by receiving the stanchion and diffusion cone therethrough. The removable portion of the housing is then placed over the filter element and clamped to the base portion.

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Belmont, NC, United States of America

Roland V Lanier