Buehler Motor Gmbh

Juergen Strueber

Bernd Fruehwald

Martin Koechling

Ruediger Spitzner

A drive with an electric motor, a housing and a direction-dependent brake, which includes a driver splined to a motor shaft, a drive output coupled freely pivotable around a small angle and shape-mated with the driver, several clamping devices and a clamping ring, in which the clamping devices cooperate with the clamping ring so that the brake conveys a torque from the electric motor to the driver output and brakes a back-driving torque of the drive output. The task of the invention is to present a brake in which no static redundancy occurs, which is simple to construct and in which no abrupt blocking is possible. This task is solved according to the invention in that the clamping ring is connected radially movable to the housing, a gearbox or a part attached to the housing so that the clamping ring after overcoming a defined force can be moved at least slightly radially by a clamping device.

Drive with an electric motor, a housing and a direction-dependent brake

The invention concerns a gear motor () with a fail-safe device () consisting of a housing (), an electromotor (), a reduction gear () with at least one planetary gear (), an electromagnetic clutch () and an output gear shaft (), wherein the planetary gear () has an internal gear. The internal gear is in mesh with at least one planetary wheel () and is fixed in its operation relative to the housing (). The planetary gear comprises the electromagnetic clutch (), a magnetically conductive armature and a magnetically conductive stator () in which an electromagnetic coil () is arranged. During the application of current to the electromagnetic coil () the internal gear () is secured against turning. The task of the invention is to provide for a reliable operation of the fail-safe device in a gear motor of such kind using less construction space and less number of components thus enabling simple assembly. This task is solved in accordance with the present invention by providing an internal gear () that acts as a magnet armature, is axially displaceable and whose geometric alignment is not determined by the housing () at least during a power-on and off condition of the electromagnetic clutch ().

Growing community of inventors

Nuremberg, Germany

Juergen Strueber