Gm Global Technolgoy Operations, Inc.

Nathan G Rues

Gary R Valler

Shachindra Dongaonkar

Konkipudi Talupulabbai

The powertrain includes a sump and an electric motor-generator configured to convert electrical energy into mechanical energy. The electric motor-generator includes a stator and a rotor. The rotor includes a rotor shaft and is configured to rotate about a shaft axis relative to the stator. The powertrain further includes an output shaft rotatable about the shaft axis and extending through the rotor shaft along the shaft axis. The output shaft and the rotor shaft jointly define a substantially annular gap therebetween. The electric motor-generator also includes a motor housing covering the stator and the rotor. The motor housing defines a housing passageway in fluid communication with the sump and the substantially annular gap. The housing passageway includes a substantially involute shaped portion in order to facilitate flow of the cooling fluid from the sump to the substantially annular gap.

Use of an involute shaped housing surrounding shaft(s) to promote shaft annulus fluid flow

A powertrain can provide propulsive power to a vehicle and includes an electric motor/generator including a motor housing, and a final drive unit partially disposed in the motor housing. The final drive unit includes a gear case coupled to the motor housing. The final drive unit further includes a differential disposed in the gear case. The differential includes a differential housing. The final drive unit further includes a first final drive bearing disposed around the differential housing. The first final drive bearing is supported by the bearing support structure connected to the motor housing. The final drive unit further includes a second final drive bearing disposed around the differential housing. The second final drive bearing is supported by the gear case.

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Fishers, IN, United States of America

Nathan G Rues