Driving unit including a liquid cooled electric motor and a planetary gear

摘要

The invention concerns a driving unit including a liquid cooled electric motor (1) and a planetary gear (3). One of the three main elements of the planetary gear, namely the element used as the reaction element, drives the positive displacement pump of the cooling circuit. Preferably, this element is the ring gear with an inner toothing (23) and said ring gear itself constitutes the pump rotor. The liquid circuit passes into a hollow shaft (11) of the motor rotor and through a radiator (31) incorporated in the common casing (5) containing the motor and the gear. Such a driving unit can be applied to driving a machine or a vehicle.