Abstract: The invention relates to a honeycomb structure, made from a porous ceramic material, said structure being characterized in that the porous ceramic material which forms it comprises: from 50 to 95% by weight of silicon carbide SiC; from 5 to 50% by weight of at least one ceramic oxide phase, said structure additionally being characterized by a porosity greater than 10%, by a specific surface area greater than 0.5 m2/g and by a pore size distribution of at least bimodal type. The invention also relates to the process for obtaining such a structure and also to the catalytic support or filter obtained from such a structure, after deposition of a catalyst.

Abstract: For diesel internal combustion engines, an improved filter unit comprising a casing the interior of which is separated by a filtering baffle into two separate chambers to which a fuel inlet conduit and a fuel outlet conduit are connected respectively, with said unit there being associated a device for determining the degree of clogging of the filtering baffle; said device is located inside said casing and is positioned to be sensitive to the difference between the fuel pressure in said chambers.

Abstract: The invention relates to a de-oiler system for an aeroengine including a casing defining a volume containing a rotary shaft and a mixture of air and oil for processing. The system comprises: a hollow rotary tube; a de-oiler structure fastened to said tube and constrained to rotate with said tube, said de-oiler structure having an inlet first face communicating with said volume and an outlet second face connected to the passage formed in said hollow tube; and transmission means between said hollow tube and said shaft for communicating to said hollow tube a speed of rotation V about its axis in such a manner that said speed of rotation V is greater than the speed of rotation v of said rotary shaft.

Abstract: A filter for a vehicle engine air intake; the filter has an undulated filtering element, and a rigid peripheral frame surrounding and supporting the filtering element, and having a C-shaped annular seat housing the peripheral edge of the filtering element; the peripheral edge of the filtering element is secured inside the annular seat by a layer of glue completely filling the annular seat; and the peripheral frame is made of composite material, and formed by gluing together a flat top annular border, made from a single sheet of material, and an S-shaped bottom annular border, also made from a single sheet of material.

Abstract: A highly porous substrate is provided using an extrusion system. More particularly, the present invention enables the production of a highly porous substrate. Depending on the particular mixture, the present invention enables substrate porosities of about 60% to about 90%, and enables advantages at other porosities, as well. The extrusion system enables the use of a wide variety of fibers and additives, and is adaptable to a wide variety of operating environments and applications. Fibers, which have an aspect ratio greater than 1, are selected according to substrate requirements, and are typically mixed with binders, pore-formers, extrusion aids, and fluid to form a homogeneous extrudable mass. The homogeneous mass is extruded into a green substrate. The more volatile material is preferentially removed from the green substrate, which allows the fibers to form interconnected networks.

Abstract: Disclosed is a filter element (3) comprising a cylindrical, porous, longitudinally penetrated filter material core (5) and a frame (6) that tightly surrounds one end of the core in a radial direction and is provided with scaling and holding means via which the filter element (3) can be removably and tightly inserted into a filter housing (1, 2).

Abstract: A honeycomb structure includes a first end face and a second end face substantially parallel to each other, a peripheral face interconnecting the first end face and the second end face, a ceramic block including plural through cells with partition walls inbetween, the cells extending from the first end face to the second end face, and a coating layer forming the peripheral face of the honeycomb structure. The thickness of the coating layer at the second end face is greater than at the first end face.

Abstract: An exhaust system includes a particulate filter (PF) that is disposed downstream from an engine. The PF filters particulates within an exhaust from the engine. A heating element heats particulate matter in the PF. A catalyst substrate or a flow converter is disposed upstream from said heating element. The catalyst substrate oxidizes the exhaust prior to reception by the heating element. The flow converter converts turbulent exhaust flow to laminar exhaust flow prior to reception by the heating element.

Abstract: A system for removing matter from a filtering device includes a flow receiving device having a plurality of blocking portions. Each of the plurality of blocking portions is configured to substantially block a flow directed by a corresponding at least one of a plurality of filter passages of the filtering device. The system further includes a positioning assembly configured to assist in positioning the flow receiving device within the filtering device and relative to a filter media of the filtering device.

Abstract: A method for testing integrity of a plugged honeycomb structure includes forming a condenser at a first end of the honeycomb structure, passing a vaporous stream into a second end of the honeycomb structure, wherein a column of the vaporous stream emerges at the first end of the honeycomb structure from cells in the honeycomb structure that are defective, and observing the first end of the honeycomb structure for condensation spots formed by contact between the column of the vaporous stream emerging at the first end of the honeycomb structure and the condenser. An apparatus for accomplishing the method is also disclosed.

Abstract: A highly durable engine grass screen assembly is disclosed. The assembly includes a grass screen for covering an air intake port of the engine, a grass screen stiffening mechanism for supporting the grass screen, a washer mechanism for compressing the screen such that the screen is pre-stressed during manufacture and such that the screen remains in compression during engine operation. The assembly can include one or more stud mechanisms which are securable to either an engine flywheel assembly or an engine fan assembly. The washer mechanism, the grass screen and the grass screen stiffening mechanism are engaged in a secured fashion to one or more stud mechanisms. A method of assembling and positioning a grass screen assembly in an engine is also disclosed.

Abstract: A filter element formed from at least one flat layer of permeable filter medium alternating with at least one pleated layer in such a way that the resulting channels have an open, especially triangular, cross section, a first group of channels being tightly sealed at one end and a second group of channels being tightly sealed at the other end such that a fluid to be filtered flowing through the filter element from an incident flow side formed by one end face to a discharge side formed by the opposite end face, must pass through one of the layers, and at least one group of channels is filled with adsorbent particles and closed by a gas-permeable fabric disposed over the corresponding end face of the filter element, the fabric pores being smaller than the adsorbent particles.

Abstract: A hybrid vehicle with an internal-combustion engine and an electric motor has a tank ventilation system that includes a fuel tank and a suction pipe leading from a filtering device, which can be regenerated, to the intake path of the internal-combustion engine. A control device is configured to actuate different valve devices for flushing the filtering device, so that ambient air can be fed to the internal-combustion engine through the filtering device and the suction pipe. In addition, the control device is configured such that, during purely electric operation of the hybrid vehicle, it connects the internal-combustion engine as a function of the loading condition of the filtering device or of the flushing gas concentration.

Abstract: A method for rigidifying a fiber-based paper substrate for use in the exhaust system of a combustion device. In the method, a green ceramic fiber-based paper substrate is impregnated with an impregnating dispersion. The impregnated substrate is then dried, calcined and fired to form a rigidified substrate that is suitable for use in the exhaust system of a combustion device. This rigidification process is performed at least once and, preferably, two or more times. The green paper substrate comprises two or more sheets of green ceramic fiber-based paper, with at least one creased sheet and another sheet being a laminated together to form a plurality of tubular channels. The rigidified substrate comprises refractory ceramic fibers in the form of a ceramic fiber-based paper and agglomerates of ceramic particles.

Abstract: A cyclonic separating apparatus includes a first cyclonic separating unit including at least one first cyclone, a second cyclonic separating unit located downstream of the first cyclonic separating unit and including at least one second clone, and a third cyclonic separating unit located downstream of the second cyclonic separating unit and including at least one third cyclone. The separation efficiency of the second cyclonic separating unit is substantially the same as the separation efficiency of either the first cyclonic separating unit or the third separating unit, providing an apparatus which achieves a higher separation efficiency than known separation apparatus.

Abstract: An air cleaner (40) includes a housing (48) and an access cover. The internal volume of the housing (48) can be reached through an opening (70) in a side wall of the housing. A filter element (50) having fluted filter media is removable and replaceable from the air cleaner (40). The housing is constructed and arranged to cam the element (50) into sealing engagement with the housing (48). The access cover includes structure to help support and ensure proper seating of the filter element within the housing. A method of installing the filter element in the air cleaner includes sliding a portion of the filter element against a slide surface in the housing. A method of servicing an air cleaner includes tilting the filter element against a tilt surface in the housing to release a seal between the filter element and the housing. The filter element can have a handle to assist in servicing of the air cleaner.

Abstract: A filter element arrangement is provided which includes a media pack comprising Z-filter media, a preform and an overmold sealing a portion of the interface between the preform and the media pack, and also forming an air cleaner seal for the filter element. The overmold preferably comprises molded, foamed, polyurethane. A variety of media pack shapes can be used.

Abstract: Unless an abnormality exists in piping introducing a pressure from front and rear of DPF 22 into a differential pressure sensor 45, pulsations of pressure propagation through an exhaust passage 21 is offset in a detection value of a pressure difference of the differential pressure sensor 45, and an amplitude of the detection value of the DPF pressure difference resulting from pulsation of the pressure becomes small. If a crack exists in one of the piping 3a and 3b, the influence of a pulsation of the pressure appears in the DPF pressure difference and the amplitude of the detection value of the DPF pressure difference becomes large. The amplitude of the detection value of the DPF pressure difference is compared with the reference value and is detected as being abnormal when it is large, utilizing the phenomenon described above.

Abstract: A filter element comprising a spirally wound filter through which a fluid to be filtered flows axially and which is provided with a mounting ring on the circumference of the wound filter secured to the wound filter by a welded, adhesive, extruded or fused joint. The mounting ring is provided with a circumferential profiled seal which engages a housing in which the filter element is installed to provide a seal between an unfiltered fluid side of the filter element and a filtered fluid side of the filter element.

Abstract: A dust separation device for separating contaminants from a fluid. The device may include at least one spiral fin disposed in an inlet tube for directing at least a portion of the contaminants in a spiral flow, and a deflector for deflecting at least a portion of the contaminants into a into a collection chamber. A fuel system for an internal combustion engine and a method of separating contaminants from a fluid are also provided.

Abstract: An exhaust aftertreatment filter has a pre-stressed layer bonded to the filter body at the outer periphery and compressively axially pre-stressed in an opposite axial direction to separational axial tensile stress to counteract the latter during regenerative heating, to minimize separational fracture and cracking.

Abstract: An air cleaner for a motor vehicle. The air cleaner includes a housing having side walls and a bottom wail defining a chamber. A filter is received within the chamber and cooperates with the housing to define a collection chamber. A primary inlet defines a primary passage into the collection chamber, and a secondary inlet defines a passage bypassing the collection chamber. The secondary inlet also includes a conduit, having an end abutting the filter. The air cleaner further includes a door positioned with respect to the secondary inlet so as to generally obstruct the secondary inlet when the door is in a closed position. The door is pivotable about weakened regions to an open position if the airflow through the primary passage is lower than a critical level.

Abstract: In a honeycomb filter in which a plurality of cells are formed by porous partition walls, and a predetermined cell whose one end portion is plugged, and a remaining cell whose other end portion is plugged are alternately arranged in such a manner as to form checked patterns in the opposite end portions. In a section of the filter, a sectional area of the predetermined cell is different from that of the remaining cell, a value of a ratio of a channel hydraulic diameter of the cell having a large sectional area to that of the cell having a small sectional area is 1.2 or more, at least a sectional shape of the cell having the large sectional area is a quadrangular shape whose portion corresponding to at least one corner portion is circular, and a value of a ratio of minimum thickness of a portion (intersection portion) in which the partition walls cross one another to a thickness of each partition wall 2 is 0.7 or more and less than 1.3.

Abstract: A ceramic filter assembly that resists cracking. The ceramic filter assembly is formed by integrating a plurality of columnar honeycomb filters made of a porous ceramic sintered material with a ceramic sealing material layer and formed to have a substantially elliptical cross sectional shape. The honeycomb filters includes square columnar honeycomb filters in which the ratio between the lengths of their long sides and short sides is between 1.1 and 3.0. The honeycomb filters are arranged so that the long sides and the short sides are respectively parallel to the major axis and the minor axis of the assembly.

Abstract: Internal combustion engine exhaust filter devices and the like are regenerated by placement in a reclamation or burn-off furnace, raising the temperature to at least about 800° F. to 900° F. and conducting relatively low volumes of low pressure air through the filter media to combust entrapped particulates and other materials residing on the filter media. The reclamation furnace includes an afterburner for combusting materials discharged from the filter devices into the furnace chamber so that complete combustion of materials is accomplished before discharge from the furnace. The flow of combustion air for the filter devices is controlled by manifolding and valving connected to a source and the oxygen content of combustion air may be enhanced by a separate source of oxygen injected into the combustion air flow stream.

Abstract: This structure comprises first and second filtering elements (15A, 15B) which are respectively provided with a first and a second face (24A, 24B) arranged opposite each other and a seal (17) connecting said faces (24A, 24B). The first face (24A) comprises at least a first region (35A) that does not adhere, or only slightly adheres to said seal (17), opposite a first region (33B) that strongly adheres to said seal (17) of the second face (24B). The first region (35A) that does not adhere or only slightly adheres is delimited by at least a portion of the edge (37) common to the first face (24A) and a discharge face (23). The first region (35A) that does not adhere or only slightly adheres comprises a side (41A) that diverges towards the discharge face (23) and which extends up to said common edge (37). Application to particle filters for engine exhaust gases.

Abstract: A honeycomb structural body is constituted with a ceramic block comprising a plurality of through-holes arranged in a longitudinal direction and separated from each other through partition walls, either end portions of which through-holes being sealed. The ceramic block constituting the honeycomb structural body is made of a composite material consisting of ceramic particles and crystalline silicon and having an excellent thermal conductivity, so that the honeycomb structural body is excellent in the thermal diffusibility but also excellent in the resistance to thermal shock because the storing of thermal stress is less and no crack is caused even if a temperature distribution is caused at a relatively low temperature or cool-heat cycle is repeated over a long period of time.

Abstract: A catalytic purification device including a substrate permeable to exhaust gases, is optionally impregnated with catalytic materials, and is provided with an upstream face and an opposing downstream face; and an envelope containing the permeable substrate and defining an enclosure provided with an inlet line and an outlet line, between which the permeable substrate is arranged, the upstream face of the permeable substrate projecting along the extension of the inlet line, and the axis of the inlet line defining, with the upstream face (14A), an angle smaller than 20°. The envelope includes a deflector arranged at the outlet of the inlet line, the deflector being inclined towards the upstream face and used to orient the exhaust gases escaping from the inlet line towards the permeable substrate. The envelope also includes elements for creating turbulence in the flow along the upstream face.

Abstract: An air dryer for an air braking system of a vehicle, the air dryer comprising a mounting (20), and a removal e desiccant canister (10) screw-threaded to said mounting (20) about a spin axis (25) and having a peripheral sealing ring (13,14), wherein the mounting includes an upstanding protrusion (28) radially spaced from said axis (25) and adapted to engage an annular recess (17) of said canister (10) within said ring, said protrusion (28) being hollow, and the interior of said protrusion (28) being connected to a vent for air under pressure in the system.

Abstract: There is provided a honeycomb filter obtained by bonding, into one piece, a plurality of honeycomb segments comprising partition walls having filtering function, and a number of through-holes divided from each other by the partition walls and extending in an axial direction. Predetermined through-holes are plugged at one end face of the filter, and the remaining through-holes are plugged at the other end face of the filter. The honeycomb filter is characterized in that the honeycomb segment disposed in a peripheral portion of the honeycomb filter has a lower average bulk density than that of the honeycomb segment disposed in a central portion.

Abstract: The present air cleaner for an engine of a vehicle, includes: a cleaner case; and a filter assembly disposed in the cleaner case. The filter assembly includes a cylindrical cleaner element, an element supporting member supporting a lower end of the cleaner element and an inner circumferential surface of the cleaner element so that the cleaner element is kept in a predetermined cylindrical shape, and a plate-shaped top cover detachably fastened on an upper surface of the element supporting member so as to press an upper end of the cleaner element downward.

Abstract: A ceramic wall-flow filter for filtering particulate matter from gases and methods for manufacturing such wall-flow filters are disclosed. The filter includes an array of porous ceramic walls defining a pattern of end-plugged inlet and outlet cells, and heat absorbing elements disposed within at least some of the outlet cells such that a bulk heat capacity of the outlet cells is greater than a bulk capacity of the inlet cells. The heat absorbing elements increase a bulk heat capacity of the filter without substantially interfering with a flow of gas through the porous ceramic walls by allowing thinner walls. According to the method, during the step of extruding or thereafter, heat absorbing elements are formed within at least some of the outlet cells such that a heat capacity of the outlet cells is greater than the inlet cells.

Abstract: An inlet conduit for an engine air induction system is provided, the inlet conduit having a plurality of openings located about a portion of the inlet conduit, the plurality of openings being disposed in a cavity of the inlet conduit; a hydrocarbon vapor-adsorbent member disposed in the cavity, the hydrocarbon vapor-adsorbent member covering the plurality of openings; and a covering member secured to the inlet conduit, the covering member being configured to cover and seal the hydrocarbon vapor-adsorbent member within the cavity, the covering member having an interior surface and an exterior surface, the interior surface facing the hydrocarbon vapor-adsorbent member while the exterior surface is flush with an exterior surface of the inlet conduit when the covering member is secured to the inlet conduit and wherein hydrocarbon vapors present in the air induction system after engine shut-down are substantially retained in the hydrocarbon vapor-adsorbent member until air flows through the air induction system af

Abstract: An integral honeycomb filter assembly is produced by adhering ceramic seal layer outer surfaces of a plurality of honeycomb filters. Each of the plurality of honeycomb filters has a plurality of cells defined by a cell wall, and purifies fluid including particulates with the cell wall. A ratio L/S between a filter length L in a flow direction of a processed fluid and a filter cross-section S in a direction perpendicular to the flow direction for each honeycomb filter is 0.06 to 0.75 mm/mm2. A ratio L/S between a filter length L in a flow direction of a processed fluid and a filter cross-section S in a direction perpendicular to the flow direction for the integral honeycomb filter assembly is 0.06 to 0.75 mm/mm2.

Abstract: A filter device, in particular for an exhaust-gas system of an internal combustion engine, includes a filter structure having at least one filter wall. Filtered-out particles are deposited on its upstream surface. It is provided that the upstream-lying surface of the filter wall is at least regionally uneven.

Abstract: The invention relates to a method of modifying a layer having photocatalytic and anti-fouling properties which is based on titanium dioxide (TiO2) and which can absorb photons in the UV region and, in particular, in the UVA region, in order to render same capable of absorbing photons in the visible spectrum, said TiO2-based layer being applied to a substrate either directly or with the insertion of at least one functional sub-layer. The invention is characterised in that the TiO2-based layer is subjected to a heat treatment in an atmosphere comprising nitrogen or nitrogen and at least one reducing gas for a sufficient period of time in order to obtain the desired visible photon absorption property, said substrate and, if necessary, said sub-layer(s) having been selected for their ability to withstand the heat treatment.

Abstract: A method and system for preventing or minimizing false back pressure faults caused by a new particulate filter in an engine exhaust system. When a new particulate filter is placed in an engine exhaust system, the normal back pressure threshold for the fault detection system is increased by a new filter offset amount. Back pressure faults at the normal level are not recorded for a limited period of engine operation and only records back pressure faults that exceed the normal back pressure threshold by the value of the new filter offset.

Abstract: Broadly speaking, the present disclosure relates to devices and methods for use with motorized vehicles. Motorized vehicles often have air intake openings in communication with at least one air filter. Air intake openings may have intake profiles of a selected shape. One aspect of the present disclosure relates to a device that comprises at least a first plug, but preferably first and second plugs each having an associated plug profile which is congruent with, and enlarged relative to, it associated intake profile. One or more plugs may comprise a body formed from a resilient material such that it is formable into a compressed state for insertion into an air intake opening and operative to return towards an uncompressed state to seal the intake opening against intrusion of contaminants. Other aspects of the present invention include a connector assembly joining first and second plugs and a method.

Abstract: With respect to the object of providing a filter element with a sufficiently high filtration capacity and easy deformability, a filter element, comprising a first component (1), a second component (2) and a pleated filter medium (3) interposed between the components (1, 2), the components (1, 2) being disposed at a distance due to the filter medium (3), is characterized in that the filter element (3) is made of a non-woven fabric and pleated such that a distance between the components (1, 2) can be reversibly reduced, at least in some regions, when a force is applied.

Abstract: An air-filter device for a motor vehicle, having a casing and a filtering body separating the clean and dirty compartment, and also having a supporting body for the filtering body and a compression body designed to co-operate mechanically with the supporting body, these bodies being mounted in the manner of sliding drawers in an intermediate mounting compartment; the contact surfaces in mutual sliding bearing of the support and compression bodies are inclined in such a way that the forced stress position leading to a compression of the seal of the filtering body is achieved by displacement of the compression body in the direction of extraction and in that the control device, bringing about this displacement, stresses the supporting body and/or the casing in order to achieve the displacement of the compression body in a forced stress position, at least at the end of displacement.

Abstract: An air cleaner for a portable engine, includes an air cleaner case attached to an upper part of an engine body of the engine. Preferably, the air cleaner case is supported on an upper wall of a shroud covering the engine. Preferably, the air cleaner case is formed integrally with the shroud. Preferably, the air cleaner further includes an air intake structure divided into a plurality of intake passages having inlets displaced relative to each other with respect to an air flow direction in which an intake air flows.

Abstract: The invention relates to a monolith retainer for a fuel canister. The retainer has a head portion for retaining a monolith within a chamber of the fuel canister and a plurality of resiliently biased leg members, which extend from the head portion along a length of the monolith being retained. The legs are resiliently biased toward the inner wall of the chamber such that, when the monolith resides within the chamber, contact feet of the resiliently biased leg members abut against the monolith. A support ridge is also provided for preventing the monolith from traveling too far into the canister.

Abstract: An air cleaner device for exchanging an element without permitting dust and dirt collected between the element and an air guide member in a clean side to fall and for smoothly permitting intake air to be supplied to the engine. An air cleaner device includes a cylindrical element with an air guide member including a guide sleeve formed into a diameter smaller than an inner diameter between element inner walls of the element which are served for inserting the air guide member from one end of the element and flange portions which are formed on the guide sleeve to be brought into contact with one end surface of the element. A cleaner case houses the element and the air guide member and an air intake duct portion which is mounted on a lower portion of the cleaner case and is arranged below the air guide member.

Abstract: The membrane air dryer includes a housing with an air inlet adjacent a first end of the housing, an air outlet adjacent a second end of the housing, a sweep air inlet and a sweep air outlet. A membrane separator has surfaces extending between and connected to the air inlet and the air outlet. A first sweep air passage in the housing extends between the first and second ends of the membrane along and including surfaces of the membrane. The first sweep air passage has an inlet adjacent the air outlet and an outlet adjacent the air inlet and connected to the sweep air outlet. The sweep air inlet and outlet is adjacent the air inlet. A second sweep air passage in the housing extends between the first and second ends of the membrane. The second sweep air passage has an inlet that is connected to the sweep air inlet and is adjacent the air inlet and has an outlet that is adjacent the air outlet and in fluid communication with the inlet of the first sweep air passage.

Abstract: In order to calculate an estimation of the quantity of accumulated particulates in a filter (32), a first estimation calculation unit (100) that outputs first estimation data (XA) calculated from the filter before and after differential pressure, and a second estimation calculation unit (110) that outputs second estimation data (XB) based on the engine operation status. Of the first and second estimation data (XA, XB), the estimation data having the higher dependability, as viewed from the engine speed at that time, is selected, whether or not to regenerate the filter is determined and with the differential between the first and second estimation (XA, XB) also taken into consideration, when the differential is larger than a prescribed value, even if the engine speed is high, the first estimation data XA is not selected since there is a risk that the dependability of the estimation value is low due to cracking of the accumulated particulates.

Abstract: An air filter assembly for a motorcycle includes a housing at least partially defining an air intake passageway. The housing includes an opening a curved surface adjacent to the opening. An air filter is formed to be substantially planar in an unrestrained condition and deformed against the curved surface to conform to the curved surface. A retention mechanism retains the air filter against the curved surface.

Abstract: A multiple retainer bridge device is provided for securing a utility member (e.g., a magnet or bracket) to posts on a housing member (e.g., a filter housing). When assembled, the utility member is staked onto the posts. A single retainer member prevents the utility member from sliding off of the posts. The retainer member has at least two ends. Each end has a recess, and each recess has a securing portion and a receptacle portion. The securing portion is fixed to the posts by, for example, sonic welding. Flash created by the fixing process is confined within the receptacle portion of the recesses.

Abstract: An elongate spike configuration of air filter for an automotive vehicle includes a cowl arranged to extend parallel to the ram air flow about the vehicle and resulting from movement of the vehicle at speed. The cowl is rotational and is power driven in rotation during operation of the vehicle such as to smooth ram air flow, reducing turbulence and excessive ram air pressure so as to improve running smoothness of the vehicle engine.

Abstract: An air cleaner arrangement or assembly is provided. The air cleaner arrangement includes a serviceable filter cartridge. The air cleaner assembly also includes an arrangement for positioning the filter cartridge into a preferred, sealing, orientation and for securing the filter cartridge in that location. Preferred serviceable filter cartridges are provided, as well as methods of assembly and use.

Abstract: A dust filter of an evaporated fuel treatment device is taught that preferably include a filtration member for filtering air introduced to an atmosphere introduction path, and a casing receiving the filtration member therein. The dust filter being disposed on the atmosphere introduction path of the evaporated fuel treatment device. The filtration member has an arcuate shape in cross section, and wherein the filtration member is arranged and structured such that air flows in a radial direction thereof, so as to be filtered.