Posidyne clutch brakes consist of a clutch stack and brake stack made up of alternating friction discs and drive plates connected to a splined output shaft. The drive plates are connected to the input shaft or housing.
A centrally located air (or hydraulic) actuated piston exerts pressure on either the clutch stack or brake stack – never both.
Adjustable actuation pressure on the friction stack establishes the torque transmitted by that stack, and is independently adjustable.
Transmission fluid circulating through the unit flows through an open center hub, through the friction stack, and out to the housing.
Cooling occurs as the fluid runs back to the bottom of the unit to be recirculated.
This system, called Oil Shear Technology, prevents wear on the friction surfaces, removes heat from the engagement area, and lubricates all internal parts.