Mechanical Powerflow from the Torque Converter to the Turbine Shaft - Engine Running
The mechanical power flow in the VT40 transmission begins at the point of connection between the torque converter and the engine flywheel. When the engine is running, the torque converter is forced to rotate at engine speed. As the torque converter rotates it multiplies engine torque and transmits it to the forward clutch (302). The forward clutch assembly, which is connected to the variable drive pulley assembly, provides the primary link to the mechanical operation of the transmission. The VT40 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 variable drive and driven pulleys during the various ratio range operations. The automatic transmission fluid pump (156), the control valve solenoid body (66) and control valve body (67) 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 (16).
2. Power to Drive the Fluid Pump
The drive sprocket (150) is splined to the torque converter cover. The driven sprocket (192), splined to the fluid pump shaft (174), is connected to the drive sprocket by the drive link assembly (151). Therefore, when the engine is running, the fluid pump shaft also rotates.
3. Fluid Coupling Drives the Turbine
Transmission fluid inside the torque converter assembly (16) creates a fluid coupling which in turn drives the torque converter turbine.
4. Forward Clutch and Turbine Shaft Driven
As the torque converter turbine rotates, the turbine shaft of the forward clutch (106), which is splined to the torque converter turbine, is also forced to rotate at turbine speed.