Robert Boschgmbh

Salzgitter Ag

Birgit Reichert

Uwe Knappenberger

Volker Flaxa

Camilo Carrillo

Klaus Freier

Fabian Lange

Karsten Kirchhoff

Armin Ploeger

Matthias Roepke

Sebastian Bruns

Sebastian Stein

Jeihad Zeadan

Markus Minnermann

Ivo Grahlmann

Christian Dillmann

The invention relates to a heat sink () for an electric machine, which heat sink has at least one cooling channel (), which adjoins an interior () surrounded by the heat sink (). The heat sink () is characterized in that the heat sink () is designed as a single-piece plate () bent into a closed ring, in the case of which plate two opposite abutting surfaces () are connected to each other in a fluid-tight manner in the region of a joint (), wherein a plurality of closed channels () extend in the plate (), which channels extend at an angle to the circumferential direction of the ring in such a way that adjacent channels () lead into each other in the region of the joint () and thus form a continuous, spiral channel, which extends in a plurality of spiral turns from an axially front end () to an axially rear end () of the annular heat sink (). In particular, the plate () of the heat sink () can be economically extruded and then brought into a shape suitable for the heat sink () by means of bending and axial offsetting. The heat sink () can be produced in a simple and economical manner and enables efficient cooling of an electric machine while requiring a minimal installation space.

Heat sink for an electric machine and method for producing said heat sink

The production of a cold-rolled strip or sheet of steel with good deforming properties, which is subjected to recrystallizing annealing and, if appropriate, a dressing operation after hot rolling, coiling and cold rolling and has a bake-hardening potential after a subsequent deformation and for a subsequent temperature treatment, succeeds because the recrystallizing annealing is carried out in a bell-type furnace while coiled and because the strip or sheet is subjected to cooling at a cooling rate of &gE;1&deg; C./s after the recrystallizing annealing from a temperature T of 200&deg; C.&lE;T&lE;A . It is consequently possible to obtain properties of bell-annealed steels and nevertheless attain a bake-hardening effect, in particular for C contents of &gE;0.02%.

Process for producing a cold-rolled strip or sheet of steel and strip or sheet which can be produced by the process

Growing community of inventors

Braunschweig, Germany

Birgit Reichert