A drive system comprising a rotatable input disc that receives an input rotational force and rotates about a longitudinal axis, where the input disc comprises driving features formed on its interior face. The drive system also comprises a rotatable output disc that rotates about the longitudinal axis and comprises driving features formed on its interior face, where the output disc provides an output rotational force. The drive system comprises a drive core between the interior face of the input disc and the interior face of the output disc to translate the input rotational force to the output rotational force. As the input disc is rotated by the input rotational force, engaging feature(s) of power disc(s) in the drive core engages the driving features of the input disc causing rotation of each power disc. As the power disc(s) is rotated, the engaging feature(s) of each power disc(s) engages the driving features of the output disc causing rotation of the output disc.

An epicyclic gear system includes an input sun gear configured to receive rotational input from a turbine of a turbo charger. A first set of planet gears is distributed around and meshes with the input sun gear. A carrier holds the first set of planet gears and defines a rotational axis about which the carrier rotates. A second set of planet gears is mounted to the carrier. An output sun gear is included, wherein the second set of planet gears are distributed around and mesh with the output sun. The output sun gear is configured to deliver rotational power to an internal combustion engine. The carrier is configured to selectively be driven by a variable speed drive to regulate output to the output sun over a range of input rotational speeds of the input sun gear.

A drive system comprising a rotatable input disc that receives an input rotational force and rotates about a longitudinal axis, where the input disc comprises driving features formed on its interior face. The drive system also comprises a rotatable output disc that rotates about the longitudinal axis and comprises driving features formed on its interior face, where the output disc provides an output rotational force. The drive system comprises a drive core between the interior face of the input disc and the interior face of the output disc to translate the input rotational force to the output rotational force. As the input disc is rotated by the input rotational force, engaging feature(s) of power disc(s) in the drive core engages the driving features of the input disc causing rotation of each power disc. As the power disc(s) is rotated, the engaging feature(s) of each power disc(s) engages the driving features of the output disc causing rotation of the output disc.

A drive system comprising a rotatable input disc that receives an input rotational force and rotates about a longitudinal axis, where the input disc comprises driving features formed on its interior face. The drive system also comprises a rotatable output disc that rotates about the longitudinal axis and comprises driving features formed on its interior face, where the output disc provides an output rotational force. The drive system comprises a drive core between the interior face of the input disc and the interior face of the output disc to translate the input rotational force to the output rotational force. As the input disc is rotated by the input rotational force, engaging feature(s) of power disc(s) in the drive core engages the driving features of the input disc causing rotation of each power disc. As the power disc(s) is rotated, the engaging feature(s) of each power disc(s) engages the driving features of the output disc causing rotation of the output disc.

A power transmission system for a hybrid vehicle includes planetary gear mechanisms that couple an internal combustion engine, an electric motor, and a transmission, and has a brake that engages and disengages the internal combustion engine with and from a housing. The planetary gear mechanisms have a first rotary element, a second rotary element, a third rotary element, and a fourth rotary element. Any one of the internal combustion engine, the electric motor, and the transmission is connected to a respective one of the first rotary element, the second rotary element, and the third rotary element. The fourth rotary element is configured as an inertial member for suppressing transmission of a torque fluctuation of the internal combustion engine to the transmission side.

A transmission having a variator drive capable of being placed in a continuously variable operating mode or an infinitely variable operating mode, capable of having a wide ratio range, and capable of integrating a clutching capability within the transmission. The variable transmissions can be operated in at least two different operating modes, depending on an engagement status of the clutches therein. Methods of running the variable transmissions and drivelines that incorporate such variable transmissions are provided.