Mag Ias Gmbh

Borealis Ag

Witzenmann Gmbh

Matthias Weber

Leo Schreiber

Wolfgang Hafner

Jürgen Reingen

Marc Seckner

Bert Balmer

Emanuel Groβ

Jochen Senger

Marius Kunkis

Andreas Kämpfe

Abdelkarim Oulad Abdellah

Peter Clymans

Hans Kuhn

Nikolaos Vavizos

Harald Betke

Maarten Brussee

Marc Jordens

Emanuel Gross

Piet Van Dooren

Peter Rittershofer

Andreas Grützmacher

Daniel Rothfuß

Markus Poschmann

Michael Marx

Leo Dr Schreiber

The invention relates to an expansion joint () for joining two adjacent parts of a pipe. The expansion joint () comprises an expansion bellows (), an expanded wall () and an inner sleeve assembly (). The expanded wall () comprises a first wall part () and a second wall part (), wherein the first wall part () and the second wall part () are spaced apart from each other axially by an axial gap. The expansion bellows () is connected to the first wall part () and to the second wall part () such that the axial gap between the first wall part () and the second wall part () is closed and such that the first wall part () and the second wall part () are connected flexibly. The expanded wall () and the inner sleeve assembly () limit at least one sealed chamber () between each other, and the at least one sealed chamber () is filled by a first gas.

Expansion joint

For friction reduction in sliding bearing, it is known to structure the sliding surface () by ECM by introducing a plurality of microscopic small indentations (). According to the invention it is proposed in particular in the same process step to smoothen also the intermediary spaces () between the indentations (), thus to remove the tips of the surface profile.

Sliding surface

In order to reduce friction of a crank shaft during operation by a large amount with low complexity through structuring sliding bearing surfaces () of the crank shaft through controlled introduction of microscopically small indentations () it is proposed for the center bearings and the crank bearings to only structure highly loaded portions of the bearing surface in circumferential direction and also in axial direction since this is already difficult to achieve in view of the operating gap towards the tool that only has a size of a few &#x3bc;m.

Structuring of sliding surface portions

Growing community of inventors

Bretten, Germany

Matthias Weber