Abstract: An acoustic damping material includes a binder matrix which includes a bitumen component or a polymer component, and a filler component that includes at least one solid particulate cellulose-containing filler. The acoustic damping material is suitable for use in damping of undesired vibrations and noise in mechanical structures and components of manufactured articles. The acoustic damping material may be applied to damping of vibrations and noise in transportation vehicles and white goods, to a vibration and noise damping element including a damping layer composed of the acoustic damping material, to a method for applying a vibration and noise damping element to a noise emitting surface of a substrate, and to a vibration damped system comprising a substrate and the vibration and noise damping element bonded to a noise emitting surface of the substrate.

Abstract: An exhaust gas flap drive for an internal combustion engine, including a driveshaft which has a central axis m, an exhaust gas flap shaft, which is indirectly connected to the driveshaft and has a central axis k, and a coupling element, which is designed as a spring. The coupling element has a first end portion which is rotationally fixed to the driveshaft, and the driveshaft has a receiving area in which the end portion is mounted. The coupling element additionally has a second end portion which is rotationally fixed to the exhaust gas flap shaft via a coupling element, and the receiving area is designed as a groove which is provided on the end face of the driveshaft. The groove has a groove base and two groove flanks which delimit a width b of the groove. The width b decreases towards the groove base, and/or the coupling element has a form-fitting connection with the second end portion in a direction of the central axis k.

Abstract: A flange plate for a manifold of an exhaust-gas system for internal combustion engines, which flange plate can be fixed via at least one holding device to an exhaust-gas outlet connecting piece of the internal combustion engine by a first outer layer, formed as a mounting layer, which can be placed at least partially directly or indirectly against the exhaust-gas outlet connecting piece via a seal, and the flange plate can be applied to the holding device by a second outer layer, formed as a holding layer, in order to generate a holding force F, acting at a right angle to the mounting layer, for sealingly placing the mounting layer against the exhaust-gas outlet connecting piece, and the flange plate having at least a first intermediate layer which is arranged, relative to the holding force F, between the mounting layer and the holding layer.

Abstract: An exhaust gas flap drive for an internal combustion engine, including a driveshaft which has a central axis m, an exhaust gas flap shaft, which is indirectly connected to the driveshaft and has a central axis k, and a coupling element, which is designed as a spring. The coupling element has a first end portion which is rotationally fixed to the driveshaft, and the driveshaft has a receiving area in which the end portion is mounted. The coupling element additionally has a second end portion which is rotationally fixed to the exhaust gas flap shaft via a coupling element, and the receiving area is designed as a groove which is provided on the end face of the driveshaft. The groove has a groove base and two groove flanks which delimit a width b of the groove. The width b decreases towards the groove base, and/or the coupling element has a form-fitting connection with the second end portion in a direction of the central axis k.

Abstract: A flange plate for a manifold of an exhaust-gas system for internal combustion engines, which flange plate can be fixed via at least one holding device to an exhaust-gas outlet connecting piece of the internal combustion engine by a first outer layer, formed as a mounting layer, which can be placed at least partially directly or indirectly against the exhaust-gas outlet connecting piece via a seal, and the flange plate can be applied to the holding device by a second outer layer, formed as a holding layer, in order to generate a holding force F, acting at a right angle to the mounting layer, for sealingly placing the mounting layer against the exhaust-gas outlet connecting piece, and the flange plate having at least a first intermediate layer which is arranged, relative to the holding force F, between the mounting layer and the holding layer.

Abstract: The invention relates to a method for the reduction of the natural vibration (resonance) of a component (2). According to the invention a vibration behavior of component (2) is determined, wherein to each of the positions having vibration amplitudes, which exceed a preset threshold value, an attenuation element (1) is locally mounted, which is formed as a multilayered adhesive element including a support layer (1.1) and a self-adhesive damping mass. Moreover the invention relates to an attenuation element (1) for the reduction of the natural vibrations of a component (2). According to the invention the attenuation element (1) is formed as a multilayered adhesive element of a support layer (1.1) and a self-adhesive damping mass (1.2), wherein the support layer (1.1) is formed of a bend-resistant material and the damping mass (1.2) preferably is formed of butyl rubber.

Abstract: A multipart gas pipe flange for connecting to a counter-flange of an internal combustion engine, having at least one flange plate designed as an outer flange, and having a flange inner part that can be received in said flange plate and is used for attaching a gas pipe which is connected downstream of the inner part in the flow direction and which is fluidically connected. The flange plate has at least one recess for the flange inner part, said recess having at least one inner surface and an inner diameter Di, and a mounting surface which can be placed at least indirectly on the counter-flange. The flange inner part has an outer surface which corresponds to the inner surface and which has an outer diameter Da.

Abstract: The invention relates to a method for the reduction of the natural vibration (resonance) of a component (2). According to the invention a vibration behavior of component (2) is determined, wherein to each of the positions having vibration amplitudes, which exceed a preset threshold value, an attenuation element (1) is locally mounted, which is formed as a multilayered adhesive element including a support layer (1.1) and a self-adhesive damping mass. Moreover the invention relates to an attenuation element (1) for the reduction of the natural vibrations of a component (2). According to the invention the attenuation element (1) is formed as a multilayered adhesive element of a support layer (1.1) and a self-adhesive damping mass (1.2), wherein the support layer (1.1) is formed of a bend-resistant material and the damping mass (1.2) preferably is formed of butyl rubber.

Abstract: An exhaust system composed of a plurality of components for an internal combustion engine for connecting to a manifold, the exhaust system includes at least one first section, which is provided indirectly or directly after the manifold in the flow direction, and a second section, which is directly adjacent thereto in the flow direction, wherein the two sections are connected to each other by a mechanical decoupling element. The resonant oscillations in the range above 600 Hz are to be attenuated in the exhaust system by more than 15 dB and, at the same time, the exhaust system is to be sufficiently rigid and self-supporting and designed to be lastingly gas-tight. For this purpose, a single-walled arid self-supporting acoustic insulating element is integrated in the exhaust system in the flow direction upstream of, or in, the first section.

Abstract: An exhaust system composed of a plurality of components for an internal combustion engine for connecting to a manifold, the exhaust system includes at least one, first section, which is provided indirectly or directly after the manifold in the flow direction, arid a second section, which is directly adjacent thereto in the flow direction, wherein the two sections are connected to each other by a mechanical decoupling element. The resonant oscillations in the range above 600 Hz are to be attenuated in the exhaust system by more than 15 dB and, at the same time, the exhaust system is to be sufficiently rigid and self-supporting and designed to be lastingly gas-tight. For this purpose, a single-walled arid self-supporting acoustic insulating element is integrated in the exhaust system in the flow direction upstream of, or in, the first section.

Abstract: The object of the invention is to customize the properties of the drive assembly of motor vehicles comprising an intake system, an exhaust system, and/or an internal combustion engine. For this purpose, the mechanical properties of a serial drive assembly, the engine parameters efficiency and rotational torque, and the acoustics of the serial intake and/or exhaust system are stored in a database in an initial step. Furthermore, the construction features of the serial drive assembly that can be customized are stored in the database with their variation parameters and limitations. After varying at least one construction feature, the modifications of the engine parameters resulting therefrom are calculated and stored as a parameter difference. Likewise, the resulting changes of the acoustic features are calculated and stored as sound difference. Thereafter, the original values of the serial drive assembly are overwritten with the difference values and reproduced acoustically.

Abstract: Ceramic support bodies for the after-treatment of exhaust gases of internal combustion engines is provided. On a jacket of the support body heat-resistant elevations are subsequently applied that fix the bed against movement.

Abstract: An internal combustion engine is provided, on an intake side of which intake manifold pipes are provided and on an exhaust side, exhaust manifold pipes. The intake manifold pipes and the exhaust manifold pipes are connected gas-tight via an acoustically permeable membrane.

Abstract: The object of the invention is to customize the properties of the drive assembly of motor vehicles comprising an intake system, an exhaust system, and/or an internal combustion engine. For this purpose, the mechanical properties of a serial drive assembly, the engine parameters efficiency and rotational torque, and the acoustics of the serial intake and/or exhaust system are stored in a database in an initial step. Furthermore, the construction features of the serial drive assembly that can be customized are stored in the database with their variation parameters and limitations. After varying at least one construction feature, the modifications of the engine parameters resulting therefrom are calculated and stored as a parameter difference. Likewise, the resulting changes of the acoustic features are calculated and stored as sound difference. Thereafter, the original values of the serial drive assembly are overwritten with the difference values and reproduced acoustically.

Abstract: A muffler with variable acoustic properties. A pressure cell with a diaphragm, a spring, a piston, a piston rod, a closing element on the piston rod, and a pressure connection line are integrated into a housing. The diaphragm is thermally insulated against the piston rod. Another layer of thermal insulation is provided between the closing element and the pressure cell.

Abstract: A muffler with variable acoustic properties. A pressure cell with a diaphragm, a spring, a piston, a piston rod, a closing element on the piston rod, and a pressure connection line are integrated into a housing. The diaphragm is thermally insulated against the piston rod. Another layer of thermal insulation is provided between the closing element and the pressure cell.

Abstract: The device for producing an overtone-rich, sporty exhaust sound of the exhaust system of a four-cylinder engine includes exhaust pipes with four manifold pipes, at least one front pipe and a tail pipe. The length and/or cross-section of at least one exhaust pipe differ from the length and/or cross-section of the other exhaust pipes. At least some of the exhaust pipes lead into a first, second and/or third collecting point.

Abstract: The device for producing an overtone-rich, sporty exhaust sound of the exhaust system of a four-cylinder engine includes exhaust pipes with four manifold pipes, at least one front pipe and a tail pipe. The length and/or cross-section of at least one exhaust pipe differ from the length and/or cross-section of the other exhaust pipes. At least some of the exhaust pipes lead into a first, second and/or third collecting point.

Abstract: The device for producing an overtone-rich, sporty exhaust sound of the exhaust system of a four-cylinder engine includes exhaust pipes with four manifold pipes, at least one front pipe and a tail pipe. The length and/or cross-section of at least one exhaust pipe differ from the length and/or cross-section of the other exhaust pipes. At least some of the exhaust pipes lead into a first, second and/or third collecting point.

Abstract: A muffler having a movable valve disk, with the help of which at least one of the tubes in the muffler housing can be opened and closed. The actuation organ for the valve disk is a corrugated tube, the fixed end of which is placed into an opening in the housing and the interior of which is connected to the atmosphere. As a result, the total pressure loss of the muffler is available as an actuation force.