# US 2013/0152530 A1 · Filtering device, in particular diesel particulate filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0152530 A1 - Document ID: US20130152530A1 - Status: Published application - Kind: A1 - Application number: 13/716,715 - Filed: 2012-12-17 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: Mann+Hummel GmbH - Inventors: Arndt-Udo Rolle; Frank Ehlen; Kathrin Lichtenwalter; Jochen Linhart; Nadine Dietsch - Web page: https://patentgrep.com/patent/US20130152530A1 ## CPC - B01D 46/528: {using wound sheets (B01D46/527 takes precedence)} - B01D 35/005: {Filters specially adapted for use in internal-combustion engine lubrication or fuel systems} - B01D 37/025: {additives incorporated in the filter} - B01D 39/20: of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires (porous ceramic material {C04B38/00} ; sintering metals C22C1/04; {making porous sintered metal bodies B22F3/10, honeycomb filters B01D46/2418, materials used for filtering exhaust gases of an internal combustion engine F01N3/022, ceramic honeycomb structures C04B38/0006}) - F01N 3/0222: {the structure being monolithic, e.g. honeycombs} - B01D 27/06: with corrugated, folded or wound material - B01D 2201/0415: Details of supporting structures - B01D 2239/0695: Wound layers - F01N 2330/06: Ceramic, e.g. monoliths - F01N 2330/32: characterised by the shape, form or number of corrugations of plates, sheets or foils - Y02T 10/12: Improving ICE efficiencies - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A filtering device features a ceramic filter body for filtering a fluid flow, the filter body consisting of a wavy layer and a flat layer and the wavy and flat layer being wound in a spiral-shaped manner. The wave length of the waves increases from the inside to the outside with increasing distance to the longitudinal axis of the filter body such that the wave troughs and the wave peaks of at least two radially adjacent windings each lie on a common radial plane. ## Claims ### Claim 1 A diesel particulate filter, comprising: a ceramic spirally wound filter body for filtering a fluid flow, the ceramic filter body including a wavy layer of filter material having a porosity and forming wave troughs and wave peaks; and a flat layer of filter material having a porosity; and wherein the wavy layer and the flat layer are overlaid onto each other and spirally wound so that waves of the wave troughs and or peaks of the wavy layer form flow channels on the side facing the flat layer and/or facing away from it; wherein the wavy length in the wavy layer increases from the inside to the outside with increasing distance to the longitudinal axis of the filter body in such a way that the wave troughs and wave peaks of at least radially adjacent windings lie each on a common radial plane. ### Claim 2 (depends on 1) The diesel particulate filter according to claim 1, wherein the wave troughs and wave peaks of all adjacent spirally wound windings lie each on a common radial plane. ### Claim 3 (depends on 1) The diesel particulate filter according to claim 1, wherein the porosity of the filter material of at least one filter web changes from the inside to the outside. ### Claim 4 (depends on 3) The diesel particulate filter according to claim 3, wherein the porosity of the filter material of at least one of the layers decreases in a direction from a radial inside to a radial outside of the filter body. ### Claim 5 (depends on 1) The diesel particulate filter according to claim 1, wherein the flat layer has a porosity that differs, at least sectionwise, from the wavy layer. ### Claim 6 (depends on 1) The diesel particulate filter according to claim 1, wherein the porosity of the flat layer is lower than the porosity of the the wavy layer. ### Claim 7 (depends on 1) The diesel particulate filter according to claim 1, wherein the ratio of wave length to wave height is at least in the inner area of the spirally wound filter body smaller than two. ### Claim 8 (depends on 1) The diesel particulate filter according to claim 1, wherein the wavy layer has a sinusoidal wave form. ### Claim 9 (depends on 1) The diesel particulate filter according to claim 1, wherein the flat layer is reinforced in the peripheral area. ### Claim 10 (depends on 1) The diesel particulate filter according to claim 1, wherein the radial height of all windings is constant. ### Claim 11 (depends on 4) The diesel particulate filter according to claim 4, wherein the wave troughs and wave peaks of all adjacent spirally wound windings lie each on a common radial plane; wherein the porosity of the flat layer is lower than the porosity of the the wavy layer; wherein the ratio of wave length to wave height is at least in an inner area of the spirally wound filter body less than two; and wherein the wavy layer has a sinusoidal wave form.