Witzenmann Gmbh Metallschlauch-fabrik Pforzheim

Witzenmann Gmbh

Nbb Nachrichtentechnik Gmbh & Co., Kg

Nbb Machrichtentechnik Gmbh & Co. Kg

Fabian Elsasser

Tom Krawietz

Thomas Burchard

Wolfgang Bredow

Thomas Haug

Michael Pluschke

Rolf Fazler

Raymond Mohrbach

Thomas Kunzmann

Dieter Wustenberg

Sebastian Reuss

A filter for a fluid-conducting pipe, in particular for a gas-conducting pipe of an internal combustion engine. The filter includes a self-supporting areal filter element and is fixable along a circumferencedirectly or indirectly in the pipe and, in so doing, covers a free cross section of the pipe. Here, the circumferenceof the filter elementcircumscribes a central filter plane. Furthermore, the filter elementor at least one layer thereof is comprised of a plastically deformable material and is provided with at least one undulationor bead, which does not intersect the circumference, in such a way that the filter elementintersects the filter plane, or a planeparallel thereto, at least four times within the circumference

Filter for a fluid-conducting pipe

A flexible conveying element, in particular for the exhaust systems of automotive combustion engines, having a helically or annularly corrugated metal hose which is installed coaxially in the metal bellows. The outside diameter of the metal hose is smaller than the inside diameter of the bellows and the ends of the hose are situated inside the end fittings of the bellows. The metal hose has an interlocked profile and the bellows and the hose are in an at least indirect contact with each other in at least one additional zone between the two end fittings.

Flexible conveying element

A tube element especially for exhaust systems and exhaust recirculation systems of combustion engines in vehicles which includes at least one helically or annularly corrugated bellows provided with cylindrical end fittings on each end of the bellows; a flexible hose made of metal and situated on an interior surface of the bellows; and a braiding hose made of metal wire which coaxially encloses an exterior surface of the bellows. The braiding hose being placed on the cylindrical end fittings together with the flexible hose so that the flexible hose and the braiding hose are connected firmly and at least indirectly. The braiding hose is installed in a state of pre-setting so that the braiding hose has a reduced radial cross-section which in frictional contact with the exterior surface of the bellows.

Tube element with one metal bellows

To reduce turbulence in a fluid flow, especially exhaust gas from automotive internal combustion engines, within a flexible conduit element, a bellows (1, 40, 42) has an internal hose (6) located therein made of woven or knit metal wire. The hose is engaged against the internal corrugations of the bellows (1) and/or a connecting pipe (41) between adjacent bellows (40, 42) to guide the exhaust gases, and dampen vibrations and oscillations, which may become resonant with the corrugations of the bellows, and thereby decrease noise level during the gas flow. The hose (6) is engaged against the inner corrugations (3) of the bellows by, for example, first axially compressing the hose to result in permanent deformation of the wires to a diameter larger than the clear inner diameter of the bellows; by then forcing the hose into the bellows, the hose will resiliently compress and engage against the bellows. The hose, at least at one point remote from an attachment stub (4) has the wires thereof circumferentially connected so that, upon axial compression, the hose will bulge in barrel shape. More than one connection (17, 18, 20-22) of the wires may be used. The frictional engagement force may be enhanced and controlled by additional internal force spreading elements, such as springs and the like, or by formation of pimples or small bulges embossed on the outside of the hose.

Flexible fluid conduit element with a metal bellows

Manual control appliance with a control lever

Manual controller with control lever

Growing community of inventors

Straubenhardt, Germany

Fabian Elsasser