Abstract: An air intake filter for internal combustion engines has a flat, replaceable filter insert 20, through which the air flows transversely in operation, and which has a gasket 22 disposed on the periphery for sealing at the face side against a ledge 15 of the filter housing 11. The insert can be inserted into the filter housing through a narrow side, the sealing pressure being produced by a cover 50 which has two sliding wedges 51 and 53. To bring it about that, when the sealing pressure is applied, the gasket 22 will not be shifted laterally with respect to the ledge 15 of the filter housing 11, the cover, which is in the form of a substantially open frame, replaceably accommodates the filter insert. The cover is provided with cams 40 and 41 which serve to fix the frame 30 in an extended position during the replacement of the filter insert.

Abstract: An intake air filter for an internal combustion engine is disclosed which includes a housing having a raw air inlet for unfiltered air and a clean air outlet for filtered air and first and second annular filter inserts disposed concentrically one inside the other within the housing through which air flows radially from the outside to the inside, the first filter insert being an outer filter insert, and the second filter insert being a safety cartridge disposed within the first filter insert, the second filter insert being closed at one end with a cover plate; the other end of the second filter insert facing the air outlet, and the second filter insert being secured to the housing by a screw thread adjacent the air outlet.

Abstract: A liquid filter for cleaning the lubricating oil of an internal combustion engine which comprises a vertically upstanding filter housing 10 closed at the top by a removable cover 12. In this filter housing there is a filter insert 18 which is removable for maintenance and separates a dirty liquid chamber 41 from a filtrate chamber 42 in the filter housing. When the cover 12 is opened and the filter insert 18 is removed, the liquid drains out through a drain passagway 17. This drain passageway 17 is provided with a shut-off device 25 which shuts off the drain passageway 17 when the filter insert 18 is installed, and which opens this drain passageway 17 when the filter insert 18 is loosened. The shut-off device 25 is a compact unit which can be mounted and inspected outside the filter housing 10, and can be used for filter housings of various sizes.

Abstract: A pressure regulating valve, especially for regulating the vacuum in the crankcase of an internal combustion engine, which includes a pan-shaped housing having a bottom part, a housing cover, and a diaphragm 14 arranged between the housing and housing cover. A hollow cylindrical part 26 is arranged adjacent the diaphragm and encloses an intermediate valve member which is held in its rest position by a compression spring 24. The diaphragm is moved by a further compression spring 25 into an upper, rest position. If a vacuum in the intake manifold exceeds a certain limit value, the first valve opening between the valve seat 17 and the valve plate 18 closes against the force of the spring 24, so that blow-by gases aspirated from the crankcase are carried through the valve opening 20. If the intake manifold vacuum increases further, the diaphragm 14 moves toward the valve opening 20 and, at a maximum permissible vacuum, closes this valve opening as well.

Abstract: A pressure regulating valve for venting the crankcase of an internal combustion engine in which the pressure regulating valve is combined with a motor oil filler tube and with an oil dip stick. This combination is distinguished by the fact that it is especially compact, and centrally connects all of the components relating to oil supply and monitoring in an internal combustion engine. This combination is further characterized in that only one connecting opening is needed on the engine block for adding oil, for returning oil from the pressure regulating valve to the oil pan, and for accommodating the oil dip stick.

Abstract: An air filter for an internal combustion engine having a housing 10 with an air inlet 11 on the raw air side and an air outlet 12 on the clean air side. The air outlet has a tubular projection 27 extending into the housing 10 on which a filter insert 15 can be removably fastened. Air passes through the filter insert 15 radially from the outside in. To seal the filter insert 15 on the tubular projection 27, a radial gasket 23 is provided which has an attachment portion clamped by an inwardly extended flange on an end plate 19 of the filter insert, and which has a seal portion with a sealing area arranged adjacent the attachment portion.

Abstract: A soot filter has sets of three to five filter tubes disposed in a circle and axially parallel to one another, through which exhaust flows radially from the outside in during operation, composed of refractory ceramic yarn wound spool-wise to form hollow cylinders. To permit an electrical burn-off of the deposited soot with a relatively low expenditure of energy, the clearance A of all adjacent filter tubes 30 from one another amounts to 2 to 4% of the average filter tube diameter D. In each interstice 36 formed by at least three filter tubes 30 an elongated electrical heating element 37 is disposed which can be turned on if the exhaust gas stream is interrupted by shutting down the internal combustion engine or by diverting the exhaust gas stream away from a set of filter tubes.

Abstract: An air intake filter containing a filter insert within a canister. The canister includes a raw air inlet and an opening for the introduction of the filter insert, the filter insert having a sealing surface parallel to the plane of the opening to seal the clean-air side. This sealing surface is applied to another sealing surface on an adapter with a sealing ring interposed therebetween, and the canister is fastened to the adapter. To prevent any shearing movement on the sealing ring when the canister is attached to the adapter, a guide is provided on the adapter and is engaged by a sliding shoe disposed on the canister. Furthermore, a spacer is situated on the canister and assures that the canister cannot be laid against the adapter unless the two sealing surfaces are correctly positioned with respect to one another.

Abstract: An air intake filter for internal combustion engines has a flat, replaceable filter insert through which air passes transversely in operation, and which can be inserted from one side into a filter housing. The filter insert has a gasket arranged on its periphery for sealing an end face of the filter insert against a lip on the filter housing. Sealing pressure is exerted by ledges on lateral portions of the filter housing which slant toward the filter insert in the direction of insertion. To prevent the gasket from being displaced laterally with respect to the lip on the filter housing when the sealing pressure is applied, the filter insert is received in a substantially open-faced frame.

Abstract: The invention relates to a process for the discontinuous burning off of carbon deposited on the heat-resistant exhaust gas filter of an internal combustion engine, particularly a diesel internal combustion engine. At least one metal must be present during this process. The problem of ensuring the combustion of the carbon at the minimum temperature and of achieving a long filter life, is solved in a particularly advantageous manner through the use of an organic complexing agent able to form a complex with the metal and/or an organo-metallic complex compound of the metal with the organic complexing agent.The invention also relates to an apparatus for performing the inventive process. For this purpose, the exhaust gas filter preferably has at least two, at least temporarily separately operable filter units.

Abstract: A oil-fill opening 12 for introducing lubricating oil into an internal combustion engine provided with a cap 15 which has a bayonet lock. On the outside of the wall of the oil-fill opening there is an oil separator 22 through which the blow-by gases from the crankcase are conveyed to the intake manifold and/or to the clean-air side of the air filter. Oil collected in the oil separator 22 is returned through a return port 23, 24 between the oil separator 22 and the oil-fill opening 12. To prevent oil from getting into the oil separator when oil is poured into the oil-fill opening 12 and backing up therein so that under certain circumstances it reaches the clean-air side of the air filter, a shutter 25 in the form of a rotary slide valve, which covers the return port 23, 24 between the oil separator 22 and the oil-fill opening 12 when the cap 15 is removed, is provided within the oil-fill opening.

Abstract: A process is described for producing filter elements which contain a cross-wound yarn as the filter material, wherein twisted yarn of fine individual fibers is roughened to enhance its filtering action. The yarn may be heat-resistant and the filter element may be used as a soot filter in the exhaust gas stream of an internal combustion engine. Before the yarn is wound up, fiber tufts are broken up by pulling the yarn under tension over a moving roughening surface, the direction of movement of the roughening surface differing by an angle alpha from the direction of movement of the yarn in the area of contact between the yarn and the roughening surface, and the angle alpha being selected in relation to the twist of the yarn, particularly so that the threads of the yarn in contact with the roughening surface are oriented transversely to the direction of movement of the roughening surface. The process produces a roughened yarn which provides the required high filter performance for a soot filter.

Abstract: A housing, such as an air filter housing, with a plastic attachment tab is provided with a releasable, one-piece, U-shaped attachment clip engaging in a through aperture in the attachment tab and having sleeves formed in the vicinity of the through aperture on the inside of each leg of the U-shaped clip, and at least one resilient tongue on each leg of the clip pressing against the attachment tab.

Abstract: A soot collector, e.g., for collection of soot from the exhaust gases of a diesel-powered internal combustion engine, having a fluid metering device which makes possible exact metering of a specified quantity of a soot remover by a controlled flow of compressed air onto the filter medium of the soot collector for regeneration of the filter medium, and which works reliably and can be manufactured economically. The fluid metering device of the soot collector includes a reservoir, a metering tank arranged in the vicinity of the reservoir bottom, a line which bypasses the metering tank, and a fluid inlet opening in the metering tank which can be closed in response to a flow of compressed air through the metering tank.

Abstract: A device for the indication of dirt accumulation on an air intake filter by measuring the negative pressure in the clean air space of the filter, the device having a spring-biased diaphragm piston driving a pointer shaft by means of a bell crank with a gear segment, the pointer shaft carrying two diametrically oppositely arranged pointers with vertical and horizontal length portions moving in axial and radial portions of a pointer gap defined between the housing cover and an indicator dial carried by the cover. A ratchet mechanism serves to retain the pointer readout by blocking return movements of the indicator mechanism, the ratchet mechanism being releasable by means of a reset button on the cover of the device. The device is calibrated by means of an adjustable bell crank spring.

Abstract: The invention relates to a means and a method for removing soot in an exhaust gas filter of an internal combustion engine, more especially a diesel engine, by reducing the ignition temperature during the operation of the internal combustion engine. For this purpose, the ignition is brought about by the addition of at least one oxidizing agent. A plurality of particles of at least one combustible substance may also be caused to flow or burn, and the particles may be passed through the exhaust gas stream to the filter, so that the soot layer is ignited.

Abstract: An oil-separating air filter assembly having a separator element arranged in a closed filter cartridge, the lower axial end cover of which has a female thread by means of which the filter cartridge can be screwed against the upper end face of a separator head. The latter carries a centrally located threaded sleeve and a standpipe forming part of the air outlet channel, the accumulated oil being drained through an annular gap between the sleeve and the standpipe. The air inlet channel is arranged radially outside the center of the separator head, having an annular channel portion in the separator head facing a plurality of inlet passages in the end cover of the filter cartridge.

Abstract: A dual-element disposable filter cartridge for air intake filters of machines operating in a dusty environment, the filter cartridge having a second pleated filter element arranged concentrically inside a first pleated filter element, the filtering paper of the second filter element, in comparison to the filtering paper of the first filter element, having a fractional effective surface area, a lesser density and a heavier gauge with wider and longer flow passages or pores which, due to the higher air flow speed therethrough, trap dust particles which, in the new state of the filter cartridge, pass through the outer filter element.

Abstract: An intake air temperature control device for mixture-compressing internal combustion engines having an inlet flapper proportioning the flows of cold and preheated raw air into a duct junction and into raw air mixing duct, the flapper-adjusting wax thermostat being arranged inside a thermostat chamber into which branch flows of cold and preheated raw air are admitted through two calibrated branch inlets. A narrow annular gap through which the combined branch flows must pass assures an integrated response of the thermostat to changing temperatures and air intake speeds. A lost-motion drive connection and a biasing member produce a full-load correction of the adjusted temperature. The flapper drive members may have valve edges which cooperate with the calibrated branch inlets to open and close the latter.

Abstract: A safety device for the clamping screws of pressurized fluid receptacles comprising an internally faceted socket recess in the head of the clamping screw and a threaded axial bore in its shaft. Into the latter is screwed a bleed screw the head of which occupies the socket of the clamping screw. The need to unscrew the bleed screw to gain access to the socket of the clamping screw prevents the inadvertent unscrewing of the clamping screw under pressure by alerting the operator to the presence of pressure, as the bleed screw opens a bleed channel and thereby creates a small fluid leak. The bleed channel extends alongside the threaded axial bore in the clamping screw and is normally closed by the head of the bleed screw.