Abstract: An exhaust gas aftertreatment device, including a bent exhaust pipe, a mixing pipe having a closed end at the exhaust pipe bend and a bell-shaped widened portion in at least partial contact with the exhaust pipe at its opposite end, and a nozzle connected to a receptacle in the mixing pipe closed end for injecting an additive into the exhaust gases, with a mixing zone in the exhaust pipe between the urea nozzle and the exhaust pipe outlet in which the exhaust gases flow around the mixing pipe symmetrically and form a double eddy in the mixing pipe.

Abstract: A process for producing exhaust gas manifolds is provided, which have a flange for fastening to the cylinder head of an internal combustion engine, manifold pipes for leading off the exhaust gases flowing from the cylinders, and a pipe connector, wherein the pipe connector has openings for the manifold pipes. In accordance with the invention, the pipe connector is designed with reinforced openings. Then the ends of the manifold pipes are introduced into the openings and expanded. In this process, the pipe ends undergo plastic deformation, and the pipes are connected gas-tight.

Abstract: A shell muffler for an internal combustion engine that is formed of a first shell and at least one second shell, which shells are connected at their respective edge regions BS so as to form the shell muffler, each edge region BS having a box-like inner contour KSi, which has four corner regions (E1)-(E4) and a width (B) and a length (L), and an outer contour KSa, and each shell being produced from a shell blank R, which is formed by deforming a sheet metal strip using a deep drawing tool having the shape of the shell, the blank R, after deforming, having an edge region BR with an outer contour KR, said edge region being removed at least partially after the blank H has been cut to size so as to form the outer contour KSa of the edge region BS of the shell, In addition to the box-like basic shape G, the inner contour KSi of the edge region BS of the shell has at least one corner region (E1-E4) which is expanded beyond the width B and the length L of the box-like basic shape (G) and is thus adapted at least part

Abstract: The invention relates to a method for mixing an exhaust gas flow with a fluid in an exhaust gas pipe 40 of an exhaust gas system 4, in which the fluid is injected by means of an injection device 5 into the exhaust gas pipe 40. The exhaust gas flow is guided in the exhaust gas pipe 40 in the area of the injection device 5 in a direction of flow S parallel to the exhaust gas pipe 40. The fluid is injected directly onto a deflection element 6 which is arranged in the exhaust gas pipe 40 in a central direction of injection E which deviates from the direction of flow S by an angle se, wherein by means of at least one sheet metal part 60 which is provided on the deflection element 6 and which is raised at least partially at an angle sv with reference to the direction of flow S, the exhaust gas flow is diverted with reference to the direction of flow S from its direction of flow S into a central direction of distribution V.

Abstract: An exhaust gas system 1 for an internal combustion piston engine, having an exhaust manifold 2 having a plurality of manifold tubes Z1-Z4 and an exhaust gas fitting 2.1, and an exhaust gas line element 3 having an exhaust gas pipe fitting 3.1 that can be connected to the exhaust gas fitting 2.1 by the exhaust gas pipe fitting 3.1. The exhaust gas manifold 2 and at least the exhaust gas pipe fitting 3.1 of the exhaust gas line element 3 each have a partition 2.2, 3.2, each forming two separate exhaust gas channels A2a, A2b, A3a, A3b each having a flow axis S2, S3, and comprising an end face 2.2s, 3.2s running transverse to the flow axis S2 in the area of the fitting 2.1, 3.1, wherein the edge segment R1, the edge segment R2, and/or the core segment K of the exhaust manifold 2 at least partially contact the exhaust gas pipe fitting 3.1 in the axial direction when the internal combustion piston engine is in the warm state.

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: A valve flap device for an exhaust system of a motor vehicle, having at least one tubular valve housing with a flow cross section running perpendicular to a central axis and being formed by the inner geometry and a shaft which can turn about a valve axis with a valve flap mounted on the shaft, being mounted in the valve housing to close the flow cross section. The valve flap device can be made with low material input and at the same time with low fabrication expense at low costs. For this, the valve housing is made from a tubular blank of sheet metal with a tube diameter that is calibrated to the flow cross section at least partially by mechanical, plastic forming.

Abstract: A housing for a flue gas unit is provided that includes a closed jacket and two end walls as well as an insert with inlet pipe an outlet pipe and retaining walls, wherein one of the pipes exits from the housing jacket radially. The housing jacket is cut out around the one pipe, the cutout is closed by a concave closing panel adapted to the shape of the cutout, and the closing panel has an opening for the radial pipe end.

Abstract: A manifold for mounting on the cylinder head of internal combustion engines includes a manifold housing, a pipe connecting flange, and, for each cylinder, an individual flange with a fastener. To make handling easier, adjacent individual flanges are joined by an expansion arch.

Abstract: The subject matter of the invention is apparatuses for the aftertreatment of the exhaust gases of diesel engines. The apparatus comprises a pipe (2), through which the exhaust gases flow, a nozzle for injecting an additive into the pipe (2), and a mixing section (3) which is arranged behind the nozzle. A mixing pipe (20) is inserted into the pipe (2) adjacently to the nozzle. Said mixing pipe (20) is provided with large-area perforations (22) on the circumference, is seated in the pipe (2) with a radial spacing, has a closure cover (25) at its end with a receptacle (26) for the nozzle and, at its other end, has a funnel-shaped widened portion (23) which bears against the pipe (2) at least in regions.

Abstract: A device for fastening an exhaust manifold to an internal combustion engine is provided. The device includes two parts. A first part that has first elongated holes for a screw fastening to the engine and openings for a screw fastening of a second bracket part. The second bracket part is fork-shaped, angular, and has on the angle branch facing the first bracket part second elongated holes and on the other angle branch, third elongated holes. The longitudinal axes of at least two of the elongated holes are oriented perpendicular to one another.

Abstract: The invention relates to a method for mixing an exhaust gas flow with a fluid in an exhaust gas pipe 40 of an exhaust gas system 4, in which the fluid is injected by means of an injection device 5 into the exhaust gas pipe 40. The exhaust gas flow is guided in the exhaust gas pipe 40 in the area of the injection device 5 in a direction of flow S parallel to the exhaust gas pipe 40. The fluid is injected directly onto a deflection element 6 which is arranged in the exhaust gas pipe 40 in a central direction of injection E which deviates from the direction of flow S by an angle se, wherein by means of at least one sheet metal part 60 which is provided on the deflection element 6 and which is raised at least partially at an angle sv with reference to the direction of flow S, the exhaust gas flow is diverted with reference to the direction of flow S from its direction of flow S into a central direction of distribution V.

Abstract: A method for monitoring functional components of a motor vehicle is provided. To this end, microphones, pulsation sensors, strain gauges and a speed sensor are positioned on or next to one of the functional components to be monitored. The electrical signals of the microphones, pulsation sensors, strain gauges, and speed sensor are measured, analyzed by means of Fourier analysis and compared with an acoustic signature.

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: An exhaust system is disclosed that has pipes and a housing, through which exhaust fumes of an internal combustion engine flow. The exhaust fumes generate a condensate, at least in part and/or in certain areas. To prevent the corrosion of sheet metal by the condensate, a sacrificial anode, which can be made of zinc and/or magnesium, is provided at least in one of the areas where the condensate collects.

Abstract: An air gap-insulated exhaust manifold for internal combustion engines. The manifold includes a flange with openings for fastening elements and further openings, which align with the cylinder exhaust ports of the internal combustion engine. A gas-tight outer shell is connected to the flange. An inner shell is provided with openings, which align with the cylinder exhaust ports of the internal combustion engine. The outer shell has a trough-shaped lower part and a hood-shaped upper part, which is welded gas-tight to the lower part. The inner shell has a trough-shaped lower part and a hood-shaped upper part. The outer shell is connected to the flange in a gas-tight manner. The inner shell is firmly attached to the outer shell at only one place.

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: A housing for an exhaust gas catalyst in motor vehicles with an internal combustion engine has a first seamless housing part deep-drawn of sheet metal, wherein the first housing part has at least one inlet cone, at least one first pipe connector, and at least one first cylindrical housing mantle. A second seamless housing part deep-drawn of sheet metal has at least one outlet cone, at least one second pipe connector, and at least one second cylindrical housing mantle. The first and second housing mantles are connected to one another by a gas-tight peripheral connecting seam.