The Swatch Group Management Services Ag

Ernst Zysset

Viktor Arbanas

The drive assembly includes one or more motors ( ) driving at least a pair of continuously variable ratio transmission devices ( ) which each drive a driving wheel or driving axle of the vehicle. Each transmission device includes a planetary gear ( ) whose reaction element, preferably the ring gear with an inner toothing, is connected to the rotor of a pump through which a hydraulic circuit passes provided with at least an adjustable valve ( ) for adjusting the speed and/or the torque of the output shaft ( ), in particular to facilitate the attainment of an operating speed for the motor when starting. The hydraulic circuits of the two transmission devices are interconnected by hydraulic lines ( ), which assures a differential effect between the two wheels concerned. One of these lines may include an adjustable valve ( ) for limiting or blocking the differential effect.

Drive unit for a vehicle with a continuously variable transmission

The invention concerns a driving unit including a liquid cooled electric motor (,) and a planetary gear (,). 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 (,) and said ring gear itself constitutes the pump rotor. The liquid circuit passes into a hollow shaft (,) of the motor rotor and through a radiator (,) incorporated in the common casing (,) containing the motor and the gear. Such a driving unit can be applied to driving a machine or a vehicle.

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

In order to assure efficient cooling and a temperature balance between the stator and the rotor, an asynchronous electric motor is provided containing a closed cooling liquid circuit which passes successively into the stator (,) and into the shaft (,) of the rotor, over the entire length of the stator and the rotor. A pump (,) is incorporated in the rotor shaft. The liquid is injected into the pump by a stationary axial tube (,) and comes out again between the shaft and this tube. The pump includes a centrifugal pumping member (,) fixed to the bottom of the bore of the shaft, and longitudinal-blades (,) fixed to the shaft facing an external helicoid rib (,) of the injection tube. The liquid is cooled by the ambient air along the periphery of the stator.

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Macolin, Switzerland

Ernst Zysset