Abstract: A replaceable filter cartridge assembly for a liquid filter and a liquid filter in which such a filter cartridge is installed. The filter cartridge 10 is provided with a support element 15, and a seat 20 for a sealing membrane 19 is provided on the support element 15. The sealing membrane seals the inlet 22 of the housing via a sealing edge 21 that acts as a return flow barrier over the inlet. The sealing membrane 19 also has a radial sealing surface 23 to provide a seal between the support element 15 and the outlet port 24 of the filter. This permits the filter cartridge to be manufactured in a particularly cost-effective manner and assures simple mounting within the housing. Since only the filter cartridge, which can be pushed onto the support element 15, needs to be exchanged, very little material has to be disposed of when the filter is replaced, which further increases the cost-effectiveness of the filter in use.

Abstract: An apparatus and method for circulating coolant liquid between machine tools and a coolant filtering unit through an overhead return line. A small stream of clean coolant is diverted to a flush tank and the tank is pressurized, e.g., with compressed air. Periodic release of the pressurized liquid from the flush tank through the overhead return line flushes deposited chips and other sediments from the return line.

Abstract: An oil quality measurement device for an oil circuit (1), which includes an oil condition sensor (2) and an analysis circuit (3). The oil condition sensor (2) is constructed as a capacitive or impedance spectroscopic sensor (4) and attached to the filter element (14) in such a way that, when the filter element (14) is replaced, the oil condition sensor (2) is also automatically replaced.

Abstract: An intake system (3) for an internal combustion engine (1) including an engine block (2), as well as an exhaust manifold (7) leading from the engine block (2), the intake system (3) including an intake tract (5) leading to the engine block (2), and having an air filter (4) and a throttle member is arranged in the intake tract (5). The intake system (3) also includes a secondary air system (8) which includes a turbine (10) and a compressor (11). The turbine (10) is subjected to the pressure difference before and after the throttle member in order to drive the compressor (11) which conveys air into the exhaust manifold (7) through a secondary air line (15) to oxidize the exhaust gases at least in the cold start phase of the internal combustion engine. To reduce the number of components and the space required, the compressor (11) and/or the turbine (10) is integrated into a housing (26) of the air filter (4).

Abstract: A free-jet centrifuge which, in contrast to prior art centrifuges which are braked by bearing friction, includes a device for braking the rotor when the oil pressure falls below a predetermined value. The rotor is mounted in a slide bearing (12), which simultaneously forms the centrifuge oil inlet (23), and also is provided with a roller bearing (19), which minimize bearing friction and enables the rotor to attain the highest possible rotational speeds. Friction partners (15a, 15b) are disposed on the centrifuge housing (10) and rotor (11) and are pressed against one another by a spring (20) when the oil pressure drops below operating pressure, to stop the rotor in order to minimize run-on of the centrifuge and the noise and bearing wear associated with run-on.

Abstract: A liquid filter for removing contaminants from liquids such as lubricating oil, water or fuel, comprising a filter housing (10), a filter element (15), a support body (16) and a slide valve (17), which, when closed, prevents liquid from flowing from an unfiltered liquid area or from a filtered liquid area to a filter outlet (24). When the filter housing is opened, the slide valve moves axially and opens the filter outlet (24) so that the filter housing can empty. The slide valve (17) is detachably snapped together with the support body (16), which in turn is connected to a housing cover (12). This enables the slide valve to be detached from the support body, and reduces the level of maintenance required by the liquid filter.

Abstract: A filter cartridge which has an insertable center tube including an upper part (13) and a lower part (14) which can be coupled together in the cartridge by a snap fastener (21). The snap fastener (21) is configured such that it can be made without undercuts by simple injection molding dies. Therefore the filter cartridge with the center tube according to the invention is very economical.

Abstract: A control valve assembly comprising at least two control valves which may be used, for example, to throttle the air intake of an internal combustion engine. The assembly is provided with a centrally arranged, force-transmitting shaft (32). The control valves are formed by blades (15) in frames (16) produced by an assembly injection molding process. The control valve blades (15) can be molded onto the force-transmitting shaft (32). The resulting assembly can be mounted or installed as a unit. Alternatively, instead of using a single continuous shaft, shaft projections can be injection molded on the valve blades, which terminate in lugs which engage in a rotationally secure manner in sockets in an adjacent valve assembly so that the two assemblies rotate together as a unit. The resulting control valve assembly is easy to install and advantageously takes up only a little space.

Abstract: A liquid filter mainly intended for oil or fuel in internal combustion engines, in which the filter comprises a replaceable filter cartridge (17). The filter cartridge is housed in a housing having an essentially central symmetry comprising a housing base and a cover which is designed to be screwed on. In order to avoid leakage residual liquid when the filter housing is opened, especially if the liquid filter is mounted horizontally, a drain screw (22) is actuated before the housing is opened, and in order to achieve the highest possible degree of drainage, the drain screw is moved to the lowest possible position by rotating a threaded member (11) by at most 360°. Upon rotation of the threaded member, a sealing ring (13) ensures tightness in the base (10) of the housing in an area “a”. After all the liquid has drained out of the housing through the drain opening (23), the filter housing can then be opened to enable replacement of the filter cartridge without danger of leakage.

Abstract: A liquid circuit for filtering a liquid, comprising a liquid storage vessel (10), a liquid pump (17), a consumer or user device (14), a filter element (23) and a controller (24). A heated liquid can be supplied at least partly to the filter element (23). The liquid circuit may be used in liquid systems in which a liquid, such as water, oil or fuel, is filtered and at least part of the liquid is returned to the storage vessel (10). The liquid is pumped in the liquid circuit from the storage vessel (10) by the pump (17) through lines (11, 13, 15, 16), filtered by filter element (23) and supplied to the consumer device (14). Excess liquid not required by the consumer device (14) is returned through liquid return line (15) to the controller (24) which directs the liquid either to the filter element (23) or the storage vessel (10), depending on the liquid temperature.

Abstract: A resonator for noise damping in a sound-conducting tubular channel (2) is provided with an actively controllable sound generator (4) which is arranged in a resonator chamber (12) to generate interference noise (16) to be superimposed on the tubular channel noise. The resonator chamber (12) is connected via a sound-transmitting opening in a tube wall (3) of the tubular channel (2) to the inside of the tubular channel. A measurement signal from a sound sensor (8) arranged in the tubular channel (2), containing information about the sound spectrum in the channel, is connected amplified, to the sound generator (4) with the same frequency and with inverse phase position. To amplify the active suppression of the sound level by the resonator with a resonator of the smallest possible overall size, the sound-transmitting opening in the tube wall is constructed as a peripheral annular gap in the tube wall.

Abstract: A filter element including an annular support body, a filter medium, which is preferably a filter paper folded in a zigzag shape, positioned on the annular support body, and end disks, which are positioned on the axial end faces of the filter medium and glued or welded to the filter medium. The filter element is characterized in that a seal carrier is provided on the support body in the vicinity of one or both end disks, and a seal, particularly an elastomer seal, is affixed to the seal carrier in an interlocking manner. The seal carrier is designed to be radially elastic. The filter of the invention is particularly suitable for filtering liquids.

Abstract: A method of making an air filter insert for cleaning the combustion air of an internal combustion engine. The method includes producing the filter insert (21) from a pleated filter medium (33) which is formed into a hollow cylinder, in which at least one end plate (33, 34) made of thermoplastic elastomer or thermoplastic polyurethane is disposed on the axial end faces of the filter medium (33). The at least one end plate (33, 34) is bonded to the cylindrical filter medium (33) by heating the filter medium or the end plate (33, 34) with a high-temperature heating element and fusing the filter medium (33) and the end plate (33, 34) to form a welded joint.

Abstract: An intake device (1) for an internal combustion engine including a main body (2) and cover element (3; 20) which are securely connected to one another. Main body (2) and cover element (3) form intake pipes (4, 5, 6, 7) of in intake manifold. The cover element (3; 20) includes a plurality of individual shells (14, 15, 16, 17; 24, 25, 26, 27), which are connected to one another. Each individual shell (14, 15, 16, 17; 24, 25, 26, 27) forms a wall section of a respective intake pipe (4, 5, 6, 7) of the intake device (1). A flexible connection element (22) is arranged between two successively adjacent individual shells (25, 26) to compensate for tolerances between the cover element (3) and the main body (2).

Abstract: An insert filter 10 for cleaning a gas stream, particularly for the intake air of an internal combustion engine or an air-conditioning unit, which includes a filter frame 11, a filter element 12 placed in the filter frame 11, and a shaft cover 13 and which is placed in the shaft 14 of a duct system 15 that guides the gas stream such that an unfiltered side 16 is separated from a clean side 17 by the filter element 12 and the filter frame 11. The shaft cover 13 closes a shaft opening 24 through which the insert filter 10 is inserted in the shaft 14. The filter frame 11 is connected to the shaft cover 13 so that the filter frame 11 can be removed from the shaft 14 without any need for additional removal aids by simply pulling on the shaft cover 13.

Abstract: A filter cartridge (16), especially for installation in an air filter of an internal combustion engine having a housing (10) with an inlet (12) for untreated air and an outlet (13) for clean air, the filter cartridge preferably being made of a pleated filter medium, and being provided with sealing elements on end plates (18, 19) arranged at the axial end faces of the filter cartridge. A support body (17) is provided on the inner wall of the filter cartridge with support surfaces (23) for axially and radially positioning the filter cartridge. A seal element (26) extending axially along the support body is also provided in the area of the support body.

Abstract: A flap mechanism includes elements for compensating tolerances and shrinkage of the flap. The compensating elements include a flap edge which is applied to the flap by assembly injection molding after the flap has cooled, thereby decreasing any gap produced between the flap and a surrounding frame by shrinkage of the flap. In addition the flap has a flap shaft which can be journaled in the frame through a conical region on the shaft such that axial shrinkage of the shaft to produce a mounting which is free of play. This construction makes it unnecessary to use additional sealing elements at the mounting locations of the flap, and the flap is also prevented from vibrating in its mounting which, in a worst case scenario, could lead to destruction of the flap.

Abstract: A duct system, especially an intake manifold for an internal combustion engine, having flap valves (13) for selective opening and closing of at least some of the ducts. The valves should be continuously adjustable in position in order to produce a swirl in the combustion airflow. To achieve this a high degree of angular precision is required in the positioning of the valves. Intake manifold manufacturing tolerances need to be compensated during assembly of the valves. Valve adjusting mechanisms are provided on the axles of the valves or in the mechanical connections of the valve gear pertaining to the valve drive mechanism.

Abstract: An air filtration system for purifying an air stream, such as the intake air for an internal combustion engine, including a system plate (10), an unfiltered air zone (13), a filter housing (12) containing a filter element (16), and a filtered air zone (19). The filter element hermetically seals and separates the unfiltered air zone (13) from the filtered air zone. The unfiltered air zone (13) is configured by a first half shell (11), which is connected to the system plate (10) in a fixed, hermetically sealed manner. The filter housing (12) is also connected to the system plate in a fixed and sealed manner. The permanent, air-tight connection of the first half shell to the system plate allows the air filtration system to be manufactured in a simpler, more rapid and more cost effective manner by obviating the need for seals and connecting elements, as well as the need to assemble such parts.

Abstract: A shift drum (10), especially for use in an intake manifold arrangement for a multi-cylinder internal combustion engine, having an induction distributor, long individual suction pipes (27) that are arranged adjacent one another, and short individual suction pipes (28) that are situated interiorly. The shift drum (10) is arranged in a longitudinal bore (26) which intersects at least the short individual suction pipes (28). Shift drum (10) is further provided with radial seals (13) which seal the individual pipes (27, 28) from each other. Separate seals (12) are provided which are fixed in position on the shift drum (10) for sealing off long individual suction pipes (27) from short individual suction pipes (28) in a closed position.