Patent ID: 8201675

Claim:
A torque converter, comprising: a torus; a forward stator; a reverse stator separate from the forward stator and separately rotatable with respect to the forward stator; a clutch assembly including: a reverse clutch with a piston plate, the reverse clutch controllably connecting the reverse stator and a drive hub; a forward clutch including the piston plate, the forward clutch controllably connecting a turbine and the drive hub; and, a cavity partially formed by the piston plate; and, a channel to supply fluid to the cavity and to vent fluid from the cavity, wherein the piston plate is displaceable in response to fluid pressure in the cavity to control operation of the reverse and forward clutches and wherein for a first force on the piston plate due to fluid pressure in the cavity substantially equal to a second force on the piston plate due to fluid pressure in the torus, the piston plate is displaceable such that both the forward clutch and the reverse clutch are disengaged.