A planetary damper is disclosed that includes a planetary gear set and at least one clock spring. The planetary gear set includes multiple rotatable gear components including a sun gear, a planet gear assembly having a plurality of pinion gears rotatably mounted on a planet carrier, and a ring gear. The at least one clock spring includes an elongated substrate wound circumferentially around the planetary gear set. The clock spring has an innermost radial rung and an outermost radial rung spaced radially outwardly from the innermost radial rung. Each of the innermost radial rung and the outermost radial rung is connected to a different one of the gear components of the planetary gear set such that the clock spring damps vibrations imparted to the planetary damper. The use of the planetary damper within torque converter assembly to damp torsional vibrations is also disclosed.

A torque-transmitting device comprises a torque converter arranged at least partially within a housing of the torque-transmitting device. The torque converter has a pump impeller, a turbine wheel, and a guide wheel. The guide wheel is connected to a stator shaft. An actuator is coupled to the stator shaft and is configured to exert a torque on the guide wheel via the stator shaft.

A lock-up device includes an input rotary member into which the torque is inputted and an output rotary member rotatable relatively to the input rotary member in a predetermined torsion angular range. The output rotary member outputs the torque. The lock-up device also includes a plurality of first coil springs coupling the input rotary member and the output rotary member. The plurality of first coil springs are actuated in an entirety of the torsion angular range. The lock-up device further includes a plurality of second coil spring pairs or sets on either an outer peripheral side or an inner peripheral side of the plurality of first coil springs so as to be actuated in parallel to the plurality of first coil springs. The two or more coil springs have different magnitudes of stiffness and are actuated in series.

A damper device of a starting device includes a drive member, a driven member, outer springs that transmit torque between the drive member and the driven member, first and second inner springs that are placed inward of the outer springs and that transmit torque between the drive member and the driven member, and a dynamic damper having third springs coupled to a first intermediate member as a rotary element and a turbine runner as a mass body coupled to the third springs. The third springs of the dynamic damper are disposed so as to be located next to the outer springs of the damper device in the circumferential direction.

A torque transmission apparatus, including: a first vibration damper with a first input part arranged to receive torque from an engine, a first output part and at least one first spring engaged with the first input and output parts; and a torque converter including a cover non-rotatably connected to the first output part, an impeller with at least one first blade and an impeller shell non-rotatably connected to the cover, a turbine with at least one second blade and a turbine shell, an output hub and a planetary gear set including a first component non-rotatably connected to the turbine shell or a second component non-rotatably connected to the output hub.

A core ring for an impeller or turbine of a torque converter is provided. The core ring includes an annular base portion including a convex blade side surface portion and a concave stator side surface portion and a wrapped outer diameter portion including an outwardly extending lip protruding radially outward from the annular base portion. A method of forming a torque core ring for an impeller or turbine of a torque converter is also provided. The method includes forming a wrapped outer diameter portion including an outwardly extending protrusion protruding radially outward from an annular base portion including a convex blade side surface portion and a concave stator side surface portion. A torque converter including the core ring is also provided.

A clutch plate assembly includes a central axis, a clutch plate with a first friction surface and a radially outer depressed portion, and a friction material ring. The friction material ring is bonded to the first friction surface and extends radially outside of the first friction surface such that an outer portion of the friction material ring is axially aligned with the clutch plate radially outer depressed portion. In an example embodiment, the first friction surface is disposed at an acute angle to a plane orthogonal to the central axis. In some example embodiments, the first friction surface is conical. In an example embodiment, the radially outer depressed portion is conical and axially offset from the first friction surface. In an example embodiment, the radially outer depressed portion is manufactured by machining, stamping, or coining.

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.

An object of the present disclosure is to provide a power transmitting apparatus which can sufficiently damp the torque variation and also can further improve the fuel consumption. For achieving the object of the present disclosure above, there is provided a power transmitting apparatus of a vehicle comprising a damper mechanism including dampers having spring properties for damping torque variations of an engine and being able to arbitrarily and selectively transmit or cut off a driving power of an engine to wheels characterized in that the power transmitting apparatus further comprises a spring property switching device for arbitrarily switching spring properties of the damper mechanism; and a spring property controller for actuating the spring property switching device to switch the spring properties according to the running state of the vehicle.

A damper device that includes a first torque transmission path including a first elastic body that transmits torque between the input element and the output element; and a second torque transmission path disposed in parallel with the first torque transmission path and including first and second intermediate elements, a second elastic body that transmits the torque between the input element and the first intermediate element, a third elastic body that transmits the torque between the first intermediate element and the second intermediate element, and a fourth elastic body that transmits the torque between the second intermediate element and the output element.