Transmission Powerflow

Transmission Powerflow

The TCM controls the hydraulic valve body by activating specific electrical solenoids and pressure regulators. The component locations within a transmission in relation to activation of shift components (multi plate clutches and brakes, band brakes, freewheels) control and direct the powerflow through the planetary gearset(s) providing various output ratios.

By design, each transmission manages powerflow uniquely with a common goal of providing progressive output ratios.

Visual explanation of a Planetary Gear Set power flow schematics
At first glance the representation of a transmissions internal components is confusing. Understanding the powerflow through the transmission is explained by a powerflow schematic. Powerflow schematics are simple line drawings of the upper half of the transmission showing engine drive torque input, torque converter powerflow, clutches, brakes freewheels and the planetary gearset(s) to output. The illustrations below will help in understanding the schematics.