Robert Boschgmbh

Winfried Habel

Otto Baumann

Andre Ullrich

Hardy Schmid

Michael Weiss

Siegfried Fehrle

Andreas Schlegel

Frank Fuchs

Holger Frank

An electric power tool has a housing having an inlet opening and an outlet opening, a drive motor contained in the housing, an electronic unit for controlling and regulating the drive unit, a fan a main air conduit extending between the inlet opening and the outlet opening of the housing, the drive motor being situated in the main air conduit supplyable with cooling air, and a heat sink operative for indirectly cooling the electronic unit.

Electrical power tool

An electric motor includes carbon brushes () disposed in a holder () that are pressed by means of a spring force () in a radial direction against a jacket face of a cylindrical collector () that is fixed to an armature shaft () of the motor. The holder () for the carbon brushes () can be removed from the motor with little effort as a result of a provision of covering means () that cover a pivot bearing () of the armature shaft () to protect it against the entry of dirt on a side of the covering means () facing the holder () for the carbon brushes (), provided with one or more chamfers () in such a way that the carbon brushes () slide over the covering means () as the holder () is being pulled off and that the carbon brushes () thereby are thrust radially outward counter to the spring force ().

Electric motor with a housing for at least two carbon brushes

Growing community of inventors

Leinfelden-Echterdingen, Germany

Winfried Habel