Mechanical Powerflow from the Torque Converter to the Turbine Shaft - Engine Running: Notes

The mechanical power flow in the Hydra-matic 9T45/50/60/65 transmission begins at the point of connection between the torque converter and the engine flywheel. When the engine is running, the torque converter cover (pump) is forced to rotate at engine speed. As the torque converter rotates it multiplies engine torque and transmits it to the turbine shaft (547). The turbine shaft provides the primary link to the mechanical operation of the transmission.

The Hydra-matic 9T45/50/60/65 automatic transmission requires a constant supply of pressurized fluid to cool and lubricate all of the components throughout the unit. It also requires a holding force to be applied to the clutches during the various gear range operations. The automatic transmission fluid pump assembly (315), and the control valve solenoid body assembly (8) provide for the pressurization and distribution of fluid throughout the transmission.

1. Power from the Engine 

Torque from the engine is transferred to the transmission through the engine flywheel which is bolted to the torque converter assembly (14).

2. Power to Drive the Fluid Pump 

The drive sprocket (304) is splined (keyed) to the torque converter hub. The drive link (305) is driven by the drive sprocket (304) and in turn drives the driven sprocket (302). The fluid pump drive shaft is splined to the driven sprocket, therefore when the engine is running, the transmission fluid pump is operating.

3. Fluid Coupling Drives the Turbine 

Transmission fluid inside the torque converter assembly (14) creates a fluid coupling which in turn drives the torque converter turbine.

4. Turbine Shaft Driven 

As the torque converter turbine rotates, the turbine shaft (547), which is splined to the torque converter turbine, is also forced to rotate at turbine speed.