Flexible pipe element for exhaust gas system of passenger car, has film made of three layers and formed as hollow cylinder between flexible inner tube and flexible, gas-tight cladding part, where exhaust gas flows via inner tube

• Main Authors: WEIS, MATTHIAS, MUENKER, KARL-HEINZ, SCHENK, KARSTEN, HAUK, STEFAN, GERHARD, ANDREAS, BAUMHOFF, DIETMAR, SELTER, OLIVER
• Format: Patent
• Language: English; German
• Published: 19.03.2009
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; ENGINEERING ELEMENTS AND UNITS; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PIPES; STEAM ENGINES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; WEAPONS

The pipe element has a film made of three layers (13-15), where the radially interior layer (13) has lubricating properties under high temperatures. The film is formed as a hollow cylinder between a flexible inner tube (11) and a flexible, gas-tight cladding part. Exhaust gas flows via the tube, and the cladding part is a metallic bellow (12) with corrugations. The properties are provided by knitted elements made of stainless steel fibers and graphite fibers, aluminum oxide based precursor coated fibers, preceramic polymer in firm, gel-like or foam-like texture and metallic-textile composites. Es wird ein flexibles Leitungselement mit kombinierter Wärmeisolation und Schwingungsdämpfung beschrieben. Zur Erzielung der zusätzlichen Eigenschaften wird eine dafür vorgesehene, vorzugsweise aus mehreren Lagen aufgebaute Schicht mit der Gestalt eines Hohlzylinders zwischen einem die Abgase führenden, flexiblen Innenteil und einem flexiblen, gasdichten Mantelteil angeordnet.