Abstract: An adapter system to connect a main shaft (9) of an electric motor to a device to be driven, in particular to a pinion of a gearing, is disclosed. The system comprises an adapter shaft (10) with a pinion attachment (11) on a first end, for rotationally stable connection to the pinion. A housing (20) is provided with devices (21, 22) to serve as bearings for the adapter shaft (10) and with a first flange (23) for attaching the housing to the gearing and with a second flange (24) for attaching it to the motor, such that the motor is substantially firmly connected to the gearing by way of the housing (20). A coupling element (40) can be connected to the motor shaft (9) in a rotationally stable manner.

Abstract: The invention is a compact gear drive with a maximum transmission range for a constant crown gear diameter and constant axial displacement. A pinion is mounted on a bearing remote from the crown gear. The pinion is constructed as a hollow shaft and is fictionally connected to a drive shaft of a driving motor.