Daimler Chrysler Ag

Borgwarner Inc.

Daimler-benz Ag

Mercedes-benz Aktiengesellschaft

Thorsten Sternal

Pierre Bonny

Holger Nuhn

Thomas Huelsberg

Gerd Tiefenbacher

Thomas Hulsberg

Ralf Puenjer

Hildwin Kuzi

Wilfried Bien

Michael Halves

Olav Reinhardt

Dirk Riewert

Alfred Riggers

Thomas H&uuml;lsberg

Jan Peter Elfeldt

Hans-J&ouml;rg Kaifel

Norbert Kreutzig

In the method according to the invention for connecting a sheet metal component () to a component () consisting of cast metal, the sheet metal component () and the component () are welded to one another by means of a pulse-welding method. In particular, a sheet metal pipe () can thereby be welded to the port () of a housing () consisting of cast metal. This advantage may be utilized for an exhaust system with an exhaust manifold () and an exhaust assembly, such as a turbocharger ().

Method for connecting a sheet metal component, such as a pipe, to a cast metal component, such as a housing port, in particular for an exhaust system

The invention relates to a process and apparatus for the forming of a hollow body. The process includes providing a forming mold comprising an upper mold and a lower mold which form a mold cavity having a cross-sectional contour in a closed state of the forming mold. The upper mold includes a roller. The hollow body is placed between the upper mold and the lower mold in an area of the mold cavity. The hollow body is preprofiled by moving at least one of the upper mold and the lower mold into the closed state at which time the roller comes into frictional contact with a surface of the hollow body running at an acute angle with respect to a direction of the movement of the at least one upper mold and lower mold. The preprofiled hollow body is then formed into a final shape corresponding to the cross-sectional contour of the forming mold by applying a hydraulic internal pressure into the preprofiled hollow body and expanding the hollow body while the upper mild and the lower mold are in the closed state. By way of the present invention, a hollow body can be reliably formed while significantly reducing the stress on the hollow body.

Method and device for forming a hollow body

An apparatus and method of attaching an exhaust manifold to an engine's cylinder head utilizing an oversized hole in the manifold, a stud fastener extending through the oversized hole, a spacer element around the stud fastener, and a nut adapted to be tightened to engage the spacer element and the flange wherein a flat gasket is compressed to a desired extent which is not so excessive that it inhibits sliding movement caused by thermal growth of the manifold.

Fastening an exhaust manifold to an engine cylinder head

A method for manufacturing an air-gap-insulated exhaust manifold, including exhaust-conducting inner tube sections and an outer shell divided into an upper shell and a lower shell, with the inner tube sections, of which at least one is designed as a curved tube, being plugged into one another. The inner tube sections plugged into one another are inserted as an assembled component into the lower shell, centered relative to the outer shell that is formed later, with the upper shell then being placed on the lower shell and pressed against the latter. Then the upper and lower shells and the inner tube sections are welded to the outer shell at those points at which they pass through the outer shell. In order in simple fashion always to ensure a sliding fit on the inner tube sections as well as the formation of a uniform air gap insulation of the inner tube sections following completion of the manufacture of the exhaust manifold, it is proposed to connect the inner tube sections with each other forcewise before they are inserted into the lower shell by means of a connecting element in each case made of a heat-volatile material, with the connecting elements being dissolved under the influence of heat following the welding of the upper and lower shells with the inner tube sections.

Method for manufacturing an air-gap-insulated exhaust manifold

An exhaust manifold for conducting exhaust gas from an internal combustion engine including a collection pipe structure having branches with engine flanges at their ends for mounting to cylinder outlet ports of the engine and an outlet flange at the downstream end of the pipe structure for connection to an exhaust pipe. The collection pipe structure has in the area of the branches a cross-section with different diameters for first and second cross-sectional directions which are normal to each other so as to form a drop-like or oval cross-sectional area which, in a downstream direction, continuously changes until the two diameters are equal providing for a circular shape at the end of the collection pipe structure adjacent the outlet flange.

Exhaust manifold for conducting exhaust gas out of an internal

In a pipe coupling between first and second pipe sections having end areas received within one another, one of the end areas has radial projections which are arranged circumferentially around its outer or inner circumference and extend toward the inner or outer surface of the other end area which has a smooth cylindrical surface adjacent the projections to permit sliding and some tilting of the pipe sections relative to each other.

Slide-fit pipe coupling

Growing community of inventors

Moisburg, Germany

Thorsten Sternal