Propulsion system arrangement and method having fluid circuits for cooling and lubrication of motor and clutch

A method of cooling and lubricating a propulsion system comprising:

• applying a torque to a driveshaft of an electric motor via a disconnect clutch engaged between the electric motor and an engine;
• disengaging the disconnect clutch via varying a pressure of a fluid for actuating the disconnect clutch supplied from an actuation fluid pump;
• applying a torque to the driveshaft via energizing stator coils in the electric motor while the disconnect clutch is disengaged;
• operating a cooling and lubrication fluid pump via rotation of the driveshaft both while the disconnect clutch is engaged and while the disconnect clutch is disengaged;
• and
• supplying fluid for cooling and lubrication to the electric motor and to the disconnect clutch based on the operating the cooling and lubrication fluid pump.

A propulsion system comprising:

• an electric motor assembly including a housing, an electric motor having a driveshaft, and a disconnect clutch;
• a fluid system including a cooling and lubrication fluid circuit structured to fluidly connect to a first pump, and a clutch actuation fluid circuit structured to fluidly connect to a second pump;
• and
• the cooling and lubrication fluid circuit including a pump outgoing conduit arranged to supply cooling and lubrication fluid from the first pump into the housing, and a pump supply conduit;
• the clutch actuation fluid circuit including a pump outgoing conduit arranged to supply clutch actuation fluid from the second pump into the housing, and a pump supply conduit;
• and
• the cooling and lubrication fluid circuit is fluidly connected to the clutch actuation fluid circuit via at least one of the respective pump outgoing conduits or the respective pump supply conduits.