Hilti Aktiengesellschaft

Thomas Schaefer

Markus Hartmann

Konrad Artmann

Thomas Mahler

Norbert Daam

Peter Hufnagel

A power tool () is provided, especially a hammer drill and/or a chiseling hammer drill, including a percussive mechanism () with a percussive element () to generate a percussive pulse onto a tool (), the element being reversibly movable along a longitudinal axis (R) by a magnetic field in order to generate the percussive pulse, and including at least a first and a second coil device () to generate the magnetic field. Each coil device () has at least a first coil ring () with a first radius (R) and a second coil ring () with a second radius (R), whereby the first radius (R) of the first coil ring () is greater than the second radius (R) of the second coil ring (), so that a space (S) is formed, at least in certain areas, between the at least first and second coil rings (), whereby a fluid (L), especially an air stream, that serves to cool the coil device () can flow through the space.

Coil spacing

A rotor for an electrodynamic machine, in particular an electric motor, is disclosed. The rotor includes a rotor packet having a first rotor end and a second rotor end as well as a plurality of interconnected sheet metal rings. Each sheet metal ring forms a web. Further, the rotor includes a web insulation with at least one winding support element for receiving a rotor coil. In addition, the rotor includes an end sheet metal element with at least one support element, where the end sheet metal element is at least partially integrated into the winding support element.

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Obermeitingen, Germany

Thomas Schaefer