Patent ID: 9593755
Date: 2017-03-14
CPC Classifications: F16F,F16H

Claim:
1. A hydrokinetic torque coupling device for coupling together a driving shaft and a driven shaft, the torque coupling device comprising: an impeller rotatable about a rotational axis and comprising an impeller shell; a casing comprising the impeller shell and a casing shell fixedly connected thereto so as to be non-rotatable relative to the impeller shell, the casing having a first engagement surface; a turbine-piston hydrodynamically drivable by the impeller and comprising a turbine-piston shell having a second engagement surface facing the first engagement surface, the turbine-piston being axially displaceable relative to the impeller between a hydrodynamic transmission mode in which the first and second engagement surfaces are spaced from and not frictionally engaged with one another, and a lockup mode in which the first and second engagement surfaces are frictionally engaged with one another to mechanically lock the turbine-piston with the casing so as to be non-rotatable relative to the casing; and a biasing device configured to exert an axial load against the turbine-piston to urge the turbine-piston axially away from the lockup mode and towards the hydrodynamic transmission mode, wherein the axial load exerted by the biasing device decreases as the turbine-piston moves axially towards the lockup mode and increases as the turbine-piston moves axially away from the lockup mode.