Abstract: The intake air filter according to the invention is for cleaning intake air for internal combustion engines, in particular in vehicles. To this end, the intake air filter comprises an openable housing (10) with an inlet (14) and an outlet (15). Disposed between the inlet (14) and the outlet (15) is an annular, closed main filter element (17) and an annular, closed secondary element (31). The secondary element (31) is connected to the outlet (15), whereby no contamination can pass through to the outlet (15) when the main filter element (17) is replaced. A centering device (29, 30, 40, 41, 42) is provided on the end face opposite the outlet (15) between the secondary element (31) and the main filter element (17), said centering device being used to fix the position of the secondary element (31) within the main filter element (17). This prevents relative movements between the main filter element (17) and the secondary element (31).

Abstract: A filter pipeline for an air intake system of an internal combustion engine has a tubular body and a filter element arranged in the tubular body. The filter element is a filter bag of a flexible material that has an opening and is attachable in the area of the opening to the tubular body. The filter bag and an inner wall of the tubular body are shaped such that in a circumferential direction of the pipeline different spacings are provided between the filter bag and the inner wall of the tubular body.

Abstract: The invention relates to a plastic hollow part (1) and to a method for the manufacture of a plastic hollow part, wherein plastic material is introduced into a molding tool by means of a blowing or injection molding process, forming a hollow connection contour (10) and the plastic is formed into a hollow part (1), wherein a support ring (4) is molded into the area of the connection contour (10).

Abstract: A method and system of determining fiber diameter distribution of a fibrous media is disclosed. The method includes providing at least one digital image representative of the fibrous media, pre-processing the images, binarizing the images, generating virtual lines on the image, solving for fiber fringe points on each of generated line, solving for fiber center points as a mean of the fringe points, generating and growing measurement circles about the fiber center points, repositioning circles and center points to avoid fiber intersections, resizing the repositioned measurement circles to intersect the opposing fringes, and calculating fiber diameters and fiber spacing.

Abstract: An air filter element (10) has a substantially planar configuration and comprises at least two pleated filter media (12, 12?), said pleated filter media (12, 12?) being arranged side by side and attached to each other in a permanent way by a connecting member (16) connecting facing longitudinal edges (14, 14?) of said filter media (12, 12?).

Abstract: The invention relates to a liquid separator, particularly an oil separator for compressed air systems. The liquid separator comprises a housing (15), which can be detachably connected by means of a bayonet-type connector (11) to a counterpart (12).

Abstract: In a method for manufacturing a filter end disc (7), for example for a fluid filter (14) of a motor vehicle, a first plastic molding material (M1) and a second plastic molding material (M2) are injected in succession into a tool mold (1) in a monosandwich method or co-injection method in such a way that the second plastic molding material (M2) is substantially surrounded by the first plastic molding material (M1). To manufacture a fluid filter, the filter end disc (7) is further irradiated by a radiation beam (L) having pre-determined beam characteristics for melting the first plastic molding material (M1), and a filter material (15) is applied to the at least partially melted first plastic molding material (M1). A filter end disc (7), in particular for a fluid filter (14) of a motor vehicle, said disc being manufactured according to a monosandwich method or co-injection method, comprises a first outer plastic molding material (M1) and a second inner plastic molding material (M2).

Abstract: An air filter insert with a folded filter medium is provided along a side edge with a sealing element which is composed of a first contact section which extends in axial direction and a second contact section which extends in radial direction, the two contact sections being applied directly to the side edge of the filter medium.

Abstract: An active intake manifold system includes at least one flap cartridge assembly having a unitary cartridge housing including one or more flap valve housings. A flap valve is rotatable in the aperture of the flap valve housing between an open state and a closed state. A shaft is provided extending through the mounting ear apertures of the flap valves so that the flap valves change state in unison. A plurality of air intake runners provides air flow communication between the outlets of the flap valve housings and the cylinder intake valves of the engine. Each intake runner includes a main runner portion that then splits into a plurality of tracts of differing lengths with each tract tuned to a different predetermined engine speed and having a length and volume selected to optimize engine performance at the predetermined speed. The flap valves may be automatically operated by an actuator under control of an engine control system.

Abstract: A filter element has a first filter layer that has an active carbon layer, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer, wherein the first filter layer is folded to a first bellows. At least one second filter layer having an active carbon layer, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer is provided. The at least one second filter layer is folded to a second bellows. The first and second bellows are folded identically. The at least one second filter layer is arranged on the first filter layer in a positive-locking way by fold alignment of the first and second bellows to form a composite of filter layers.

Abstract: An air intake device for an engine comprises an intake manifold (1) equipped with a series of intake pipes (4) respectively associated with an inlet duct (5) of the cylinder head (3), each of the inlet ducts being subdivided into an upper duct segment (50) and a lower duct segment (51) by a partition (6), and the intake manifold (1) being equipped with a series of flaps (7) mounted about a common rotation shaft (8). The partition (6) of each of the inlet ducts (5) extends into the associated intake pipe (4), and each of the flaps (7) is rotatably moveable between an open position and a sealing position in which each flap (7) essentially seals the lower segment (51) of the associated inlet duct (5).

Abstract: Anti-noise device for an internal combustion engine (9) equipped with a turbocompressor (10) for supercharging includes a turbine (11) placed in the exhaust gas flow and driven by these gases with the turbocompressor (10) connected by a shaft (13) to a compressor (14) mounted in the air intake conduit (3) of the engine (9). The anti-noise device includes a hinged flap (4) mounted within the air intake conduit (3) of the engine (9), upstream from the compressor (14) and capable of closing this conduit (3) under the action of a gaseous reflux coming towards it.

Abstract: A filter for filtering a fluid has a filter housing and a filter element arranged in the filter housing. A cyclone preseparator is arranged upstream of the filter element, wherein a fluid to be cleaned is guided through the preseparator to the filter element. The cyclone preseparator has at least two cyclone cells that have a different diameter, respectively.

Abstract: A tunable sound transmission device for transmitting an engine rumble sound into an interior of a motor vehicle includes a transmission line having a first end in acoustic communication with an air intake tract of an engine. A flexible membrane is positioned to sealably close off a portion of the transmission line thereby dividing the transmission line into two portions that are airflow isolated from each other. A receptacle is arranged at the second end of the transmission line and a user changeable sound characterization device is replaceably installed into the receptacle. The sound characterization device is configured and adapted to provide an intended frequency dependent sound attenuation characteristic and an overall sound dampening level for the transmitted engine sound.

Abstract: A sealing arrangement is provided in which a seal flange includes a seal flange body having an integrated electrically conductive seal integrated onto an outer circumferential edge of the seal flange body. The seal flange with integrated seal is installable to seal between two confronting mounting flange faces. The seal is operative to conduct electric charge between said seal flange body and said mounting flanges.

Abstract: The invention relates to a combination filter arrangement (1) having a hollow cylindrical filter element (2) for filtering a first fluid medium, having a temperature compensation medium separated by means of cylindrical separating wall (5), as a second fluid medium in an area between the separating wall (5) and an outer housing (9) of the combination filter arrangement (1). The first fluid medium is made of a urea-water mixture, or comprises a urea-water additive having a higher freezing temperature than the first and the second fluid medium, and at least the separating wall (5) has an elasticity such that the volume expansion by freezing the urea-water additive can be absorbed.

Abstract: A resonator for an air intake system of a motor vehicle has a housing and at least one resonator chamber enclosed by the housing. At least one air intake opening for fresh air is provided in the housing and opens into the resonator chamber. At least one air exhaust opening for fresh air is provided in the housing and opens into the resonator chamber. The at least one air exhaust opening is also an intake opening of an auxiliary device, especially an air compressor.

Abstract: A separation cone (30) is mounted into the interior chamber of a centrifugal separator rotor (10), which comprises a cover (14) releasably connected to a base (16), in order to provide a frusto-conical wall subdividing the chamber into upper and lower regions. This slows the passage of fluid from the upper to the lower region, which takes place via openings (24) and/or via a gap between the inner rim (32) of the cone (30) and the axial inlet tube (12). The separation cone (30) is connected to the cover (14) by a releasable snap fit arrangement, such as by deflectable tabs (38) around the periphery of the separation cone (30) engaging into a groove (15) around the interior surface adjacent a lower edge of the cover (14). This allows there to be a predetermined sequence of servicing operations and ensures that the separation cone (30) will reliably stay with the cover (14) when the cover is removed.

Abstract: A filter has a housing with cylindrical wall having a first end face and a second end face. The housing has an end wall that closes of the first end face. A filter insert is arranged in the housing. A lid is attached to the cylindrical wall and closes off the second end face. The housing has two layers of different plastic materials, wherein the different plastic materials have different ductility and in particular different hardness. The cylindrical wall has elements that provide a positive-locking connection of the two layers in the axial direction of the housing.

Abstract: A tuned acoustic attenuation device includes a housing defining a chamber within with air inlet and outlet channels opening into the chamber. An acoustic chamber or chambers are arranged on an exterior wall of or alternately within the housing and positioned to extend in a substantially lateral parallel relationship to the inlet or outlet channel and are configured as quarter wave tuners. The acoustic chambers may be realized within the housing by adapting housing stiffening support ribs of the housing. The acoustic attenuation characteristics of individual acoustic chambers cooperate to broaden the sound attenuation bandwidth or increase the attenuation at selected noise frequencies.