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.

A lockup device (63) includes a lockup clutch (64) for establishing connection between a rotating body (44) of a torque converter (41) and a transmission shaft (55), a lockup control valve (70) that controls supply/discharge of pressurized oil from a hydraulic pump (69) to/from the lockup clutch (64), and a lockup oil passage (75) that introduces pressurized oil from the lockup control valve (70) to the lockup clutch (64). The lockup control valve (70) is arranged on an outer side face (18B) of an intermediate casing (18) in a position of radially overlapping the transmission shaft (55) in a radial direction of the transmission shaft (55). Further, a casing side oil passage (76) constituting the lockup oil passage (75) is formed as a linear oil passage that linearly extends in the radial direction of the transmission shaft (55) between the lockup control valve (70) and the transmission shaft side oil passage (77).

A torque converter comprises a cover configured to receive an input torque and an impeller having an impeller shell non-rotatably connected to the cover. A piston is disposed axially between the cover and the impeller. The piston is configured to axially displace to selectively engage a clutch and a seal plate is disposed axially between the piston and the cover. The seal plate is sealed to the cover. A first chamber is formed at least in part by the cover, the seal plate, and the piston. A second chamber is formed at least in part by the piston and the impeller shell.

A torque converter comprising a stator including a base and an impeller including: an impeller shell; and, a hydrostatic thrust bearing. The hydrostatic thrust bearing comprising: a first bearing surface facing the stator; a recess geometry arranged for maintaining at least one hydrostatic pressure region for preventing the first bearing surface from contacting the stator; and, a fluid pathway between the stator and the impeller.

A hydraulic power transmission includes a pump impeller, a turbine impeller, a cover member, a lock-up clutch, an output member, a plurality of primary springs, a plurality of secondary springs, an intermediate member, a first dynamic vibration absorber, and a second dynamic vibration absorber. The intermediate member holds the output member and connects the primary springs and the secondary springs. The first dynamic vibration absorber is attached to the intermediate member and has a first frequency. The first dynamic vibration absorber includes a first mass body and a first damper member. The second dynamic vibration absorber is attached to the intermediate member and has a second frequency different from the first frequency. The second dynamic vibration absorber includes a second mass body and a second damper member.

A device includes a front cover, a torque converter main body, a lock-up device, and a dynamic damper. The dynamic damper is fixed to an output plate of the lock-up device. The dynamic damper has a base plate, an inertial body that includes inertia rings and lid members, and an elastic unit. The base plate is fixed to the output plate. The inertial body can rotate relative to the base plate. The elastic unit can generate a variable hysteresis torque according to a relative rotation angle difference between the base plate and the inertial body, and couples the base plate and the inertial body elastically in a rotation direction.

A torque transmitting device comprising a torque input element (17a, 17b) and a torque output element (8) able to pivot about an axis (X) with respect to one another, at least one elastic leaf (22), rotationally coupled to the torque output element (8) or to the torque input element (17a, 17b) respectively, the elastic leaf (22) being able to be elastically and radially held torest on a supporting member (18) carried by the torque input element (17a, 17b) or the torque output element (8) respectively, the elastic leaf (22) being able to bend upon rotation of the torque input element (17a, 17b) with respect to the torque input element (8).

A hydrokinetic torque coupling device includes a casing having opposite sidewalls and an outer wall extending between and connecting the opposite sidewalls, an impeller coaxial aligned with the rotational axis, a piston engagement member extending substantially radially inward from and non-moveable relative to the outer wall of the casing, and a turbine-piston coaxially aligned with and hydrodynamically drivable by the impeller. The turbine-piston includes a turbine-piston shell having a turbine-piston flange with an engagement surface that is movable axially toward and away from an engagement surface of the piston engagement member to position the hydrokinetic torque coupling device into and out of a lockup mode in which the turbine-piston is mechanically locked to and non-rotatable relative to the piston engagement member.

A hydrokinetic torque coupling device features a casing (12) including an impeller shell (18), a casing shell (20), and an intermediate casing component (22) connecting the impeller and casing shells. The intermediate casing component (22) includes a casing wall portion and a piston engagement portion (26) extending inward from and being non-rotatable relative to the casing wall portion. The device further features an impeller (30) including the impeller shell (20). The turbine-piston (32) is coaxially aligned with and hydrodynamically drivable by the impeller (30), and includes a turbine-piston shell (35) having a turbine-piston flange (38) with an engagement surface that is movable axially toward and away from an engagement surface of the piston engagement portion to position the hydrokinetic torque coupling device respectively into and out of a lockup mode.

A torque converter having a shell formed by a front cover assembly and a rear cover. The front cover assembly further includes a front cover and a front boss, with the front boss being fixedly mounted to the front cover. The torque converter further including an impeller, a turbine located within the shell, a lock-up clutch and a piston. The piston being axially moveable relative to the front cover assembly along a central axis of the torque converter. A leaf spring, positioned between the piston and the front cover assembly, connects the piston to the front cover assembly.