Automatic transmission turbine shaft with an air bleed for a rotating clutch

A vehicle comprising:

• a power-source configured to generate a power-source torque;
• an automatic transmission assembly mounted externally to the power-source and configured to transmit the power-source torque;
• a drive wheel configured to receive the power-source torque transmitted by the automatic transmission assembly;
• wherein the automatic transmission assembly includes:
• a torque converter operatively connected to the power-source, and configured to receive and transfer the power-source torque relative to a transmission central axis;
• a turbine shaft arranged along the transmission central axis and configured to receive the power-source torque from the torque converter;
• a torque transfer system configured to receive the power-source torque from the turbine shaft and select an input-to-output speed-ratio of the automatic transmission assembly, wherein the torque transfer system includes a gear-train and a hydraulic pressure operated torque-transmitting device;
• and
• an output member operatively connected to the torque transfer system and configured to receive the power-source torque therefrom and output the power-source torque to drive a load;
• wherein the turbine shaft defines:
• a first passage configured to supply hydraulic pressure to the torque-transmitting device;
• a second passage configured to vent to atmosphere;
• and
• a third passage fluidly connecting the first passage to the second passage and thereby configured to bleed air from the torque-transmitting device;
• and
• a differential assembly operatively connected to the output member to thereby power the drive wheel via the power-source torque.