Torque converter clutch with reduced back pressure

A torque converter comprising:

• a housing including an impeller shell and a cover;
• a first hub, fixed to the cover, comprising:
• a body;
• a pedestal positioned radially outward relative to the body and having an outer circumferential surface and a groove disposed therein;
• and,
• a first seal disposed in the groove;
• a torque converter clutch including:
• a piston plate rotationally sealed to the first hub via the first seal;
• and
• a clutch plate;
• a second seal for sealing the piston plate to a balancing plate;
• a third seal for sealing the piston plate to the cover;
• the balancing plate rotationally fixed to the piston plate and fixed to the first hub;
• and;
• a turbine including a turbine shell fixed to a second hub arranged for sealing to a transmission input shaft,
• wherein:
• the first seal is at a first radial distance relative to the axis of rotation;
• the second seal is at a second radial distance relative to the axis of rotation;
• the third seal is at a third radial distance relative to the axis of rotation;
• wherein the first radial distance is less than the second and third radial distances;
• and
• wherein the second and third radial distances are same or equal.

A torque converter comprising:

• an axis of rotation;
• a first fluid pathway arranged for flowing hydraulic fluid from a transmission input shaft through a first bore in a first hub to an apply chamber;
• a second fluid pathway arranged for flowing hydraulic fluid from between the transmission input shaft and a second hub through a second bore in the first hub into a balancing chamber;
• a third fluid pathway arranged for flowing hydraulic fluid between a third hub and a stator shaft into a fluid coupling chamber;
• a fourth fluid pathway arranged for flowing hydraulic fluid between the second hub and the stator shaft into the fluid coupling chamber;
• a piston plate;
• a first seal at a first radial distance relative the axis of rotation for sealing the first hub to the piston plate;
• a second seal at a second radial distance relative the axis of rotation for sealing the piston plate to a balancing plate;
• a third seal at a third radial distance relative the axis of rotation for sealing the piston plate to the cover;
• the first radial distance is at most equal to the second and third radial distances, where the second and third radial distances are same or equal.