The invention relates to a hydrokinetic. torque coupling device, comprising an impeller wheel (2) able to hydrokinetically drive a turbine wheel (3) into rotation, with the turbine wheel (3) being able to be axially moved between an engaged position and a disengaged position, characterized in that the radially external periphery of the turbine wheel (3) comprises a seal (18) able to come to rest onto a matching sealing surface (22) positioned radially outside the turbine wheel (3), onto the impeller wheel (2) or onto a part (5) rotationally coupled to the impeller wheel (2) in the disengaged position.

A friction clutch selectively and directly couples a rotatable drive and driven members. The friction clutch includes first and second clutch members movable toward and away from each other along an axis between disengaged, partially engaged, and fully engaged positions. The first and second clutch members are independently coupled to the drive and driven members. The friction clutch further includes first and second friction materials positioned between the first and second clutch members. The first and second friction materials are each independently coupled to one of the first and second clutch members and are each independently engageable with an engagement surface of the other one of the first and second clutch members. The first friction material engages the respective engagement surface in the partially engaged position and the second friction material engages the respective engagement surface in the fully engaged position.

A hydrokinetic torque coupling device for coupling together a driving shaft and a driven shaft. The torque coupling device includes a casing rotatable about a rotational axis and having a casing cover shell and an impeller shell, an impeller coaxial aligned with the rotational axis, a turbine-piston coaxially aligned with and drivable by the impeller and including a turbine-piston shell, a stator situated between the impeller and the turbine-piston, a torsional vibration damper configured to operatively connect the turbine-piston shell to an output hub having radially outer gear teeth, a rotatable damper hub drivenly connected to the torsional vibration damper and having radially inner gear teeth, a carrier configured to connect to a stationary stator shaft, and a planet gear rotatably supported by the carrier and meshing with the radially inner gear teeth of the damper hub and the radially outer gear teeth of the output hub.

A hydrokinetic torque coupling device for coupling together driving and driven shafts, comprises a casing, impeller and turbine wheels, a torsional vibration damper, a turbine hub non-rotatably connected to the turbine wheel, and first and second vibration absorbers. Each of the first and second vibration absorbers is one of a dynamic absorber and a pendulum oscillator. The turbine hub is non-rotatably coupled to a driven member of the torsional vibration damper. The first vibration absorber is mounted to the turbine hub and the second vibration absorber is mounted to one of the turbine hub and the casing. The first vibration absorber and the second vibration absorber are tuned to address different orders of vibrations. The dynamic absorber includes an inertial member and a connecting plate coupled to the inertial member. The pendulum oscillator includes a support member and flyweights configured to oscillate relative to the support member.

A torque converter includes a front cover, an output shaft member, a piston, a clutch, an impeller, and a turbine. The piston is supported by the output shaft member. The piston slides on the output shaft member in an axial direction. The piston extends in a radial direction. The clutch is disposed between the front cover and the piston. The impeller includes an impeller shell and an impeller blade. The impeller shell is fixed to the front cover. The impeller blade is attached to the impeller shell. The turbine includes a turbine shell, a turbine blade and a connecting portion. The turbine shell is disposed in opposition to the impeller. The turbine blade is attached to the turbine shell. The connecting portion connects the piston and the turbine shell so as to make the piston and the turbine shell unitarily rotatable.

In a fluid transmission device in which a core is fixed to inner ends of a plurality of blades so as to form, together with a bowl-shaped shell and the blades, an impeller, the core including a plurality of latching holes with which a projecting piece projectingly provided at the inner end of the blade is latched and including a balance weight chip welded to the core, the balance weight chip includes a projecting piece-avoiding hole through which a portion, projecting from the latching hole, of the projecting piece extends, the balance weight chip being welded to the core with a whole of the balance weight chip in intimate contact with the core.

A drive assembly for a torque converter is provided. The drive assembly includes a turbine including a turbine shell and a plurality of turbine blades; and a spring retainer riveted to the turbine shell by at least one rivet. A torque converter for a motor vehicle drive train is also provided that includes the drive assembly and an impeller, with the turbine shell being axially slidable against the impeller to operate as a piston of a lock-up clutch of the torque converter. Further, a method of forming a drive assembly for a torque converter is provided that includes riveting a spring retainer to a turbine shell.

A lock-up device for a torque converter is disposed between a front cover coupled to an engine-side member and a torque converter body and directly transmits a torque from the front cover to a turbine of the torque converter. The lock-up device includes a clutch portion to transmit the torque from the front cover to an output side. The lock-up device includes an intermediate member in a power transmission path between the clutch portion and the turbine. An input-side damper mechanism mounted between the clutch portion and the intermediate member attenuates variation in rotational speed. An output-side damper mechanism mounted between the intermediate member and the turbine generates a hysteresis torque larger than a hysteresis torque of the input-side damper mechanism and attenuates variation in rotational speed. The lock-up device also includes a dynamic damper device coupled to the intermediate member and that attenuates variation in rotational speed.

A lock-up device includes a clutch portion, an intermediate member, a driven plate, a damper portion and a dynamic damper device. The clutch portion is a portion into which a torque is inputted from a front cover. The intermediate member is a member into which the torque is inputted from the clutch portion. The driven plate is rotatable relatively to the intermediate member and is coupled to a turbine hub. The damper portion elastically couples the intermediate member and the driven plate in a rotational direction. The dynamic damper device is mounted to an outer peripheral part of the driven plate and attenuates fluctuation in a rotational speed.

A spring assembly for absorbing and attenuating a torsional vibration includes an outer coil spring and an inner coil spring. The inner coil spring is disposed in an interior of the outer coil spring. The inner coil spring has a shorter free length than the outer coil spring. The inner coil spring is chamfered on end surfaces of both ends thereof. The inner coil spring has an outer diameter set to be smaller at least at an endmost winding on each of the ends thereof than at other windings thereof.