US Patent No. 9,181,992

TORQUE CONVERTER FOR MOTOR VEHICLE


Patent No. 9,181,992
Issue Date November 10, 2015
Title Torque Converter For Motor Vehicle
Inventorship Ulrich Bertram, Bergheim (DE)
Assignee FORD GLOBAL TECHNOLOGIES, LLC, Dearborn, MI (US)

Claim of US Patent No. 9,181,992

1. A torque converter assembly, comprising:
an engine output shaft;
a turbine including a turbine frictional element rotatably fixed thereto;
a transmission input shaft;
a converter housing rotationally fixed to the output shaft and including a housing frictional element;
a lock-up clutch including a disc-shaped member rotationally fixed to and axially slidable on the input shaft;
a first hydraulic fluid filled cavity applying pressure to a first side of the disc to axially move the member along the input
shaft toward engaging the housing frictional element to mechanically couple the input shaft to the output shaft;

a second hydraulic fluid filled cavity applying pressure to an opposed second side of the disc to axially move the member
along the input shaft toward engaging the turbine frictional element to mechanically couple the input shaft to the turbine;

wherein the torque converter includes two external connections for hydraulic fluid, a first connection for hydraulic fluid
that is under a converter charging pressure (CC) and a second connection for hydraulic fluid that is under a converter discharging
pressure (CDC);

wherein the lock-up clutch is configured to decouple the input shaft from both the output shaft and the turbine when the CC
is substantially equal to the CDC;

wherein the lock-up clutch is configured to couple the transmission input shaft to the engine output shaft if the CC is lower
than the CDC;

wherein the lock-up clutch is configured to couple the transmission input shaft to the turbine when the CC is higher than
the CDC; and

wherein the lock-up clutch is configured to decouple the transmission input shaft when the CC is substantially equal to the
CDC.