Vibration damper and lock-up clutch for hydrokinetic torque-coupling device, and method for making the same

A hydrokinetic torque-coupling device for coupling a driving shaft and a driven shaft together, comprising:

• a casing rotatable about a rotational axis and having a locking surface;
• a torque converter including an impeller wheel rotatable about the rotational axis and a turbine wheel disposed in the casing coaxially with the rotational axis, the turbine wheel disposed axially opposite to the impeller wheel and hydro-dynamically rotationally drivable by the impeller wheel;
• and
• a locking piston axially moveable along the rotational axis to and from the locking surface of the casing, the locking piston having an engagement surface configured to selectively frictionally engage the locking surface of the casing to position the hydrokinetic torque-coupling device into and out of a lockup mode in which the locking piston is mechanically frictionally locked to the casing so as to be non-rotatable relative to the casing;
• the locking piston including a torsional vibration damper comprising
• a torque input member including a radially oriented first side plate and at least one supporting member mounted thereto;
• and
• a unitary radially elastic output member pivotable relative to and elastically coupled to the torque input member;
• the radially elastic output member including an annular output hub coaxial with the rotational axis and rotatable relative the torque input member, and at least one elastic blade integral with the output hub and configured to elastically and radially engage the at least one supporting member and to elastically bend in the radial direction upon rotation of the first side plate with respect to the radially elastic output member;
• the at least one elastic blade having a proximal end non-moveably connected to the output hub, a free distal end and a curved raceway portion disposed between the proximal and free distal ends of the at least one elastic blade for bearing the at least one supporting member;
• the annular output hub of the radially elastic output member being adapted to directly and non-rotatably engage the driven shaft;
• the first side plate of the torque input member of the torsional vibration damper non-rotatably engaging the turbine wheel;
• the torque input member axially moveable relative to both the impeller wheel and turbine wheel to and from the locking surface of the casing.