Abstract: Transmission systems are disclosed which include a dual sunwheel system having an output sunwheel (70) and a control sunwheel (80). A planet cage is arranged around the dual sunwheel system and includes a planet gear (62) in mesh with the sunwheel (70) and a planet gear (64) in mesh with the sunwheel (80). The planet gears (62) and (64) are coupled to one another. The drive ratio of the transmission is controlled by controlling the cage (18) or the control sunwheel (70). The speed of rotation of the input, output and control sunwheel (70) are sensed by sensors (90) and control signals are generated to control a control device to thereby control the rotation of the input cage or the control sunwheel to thereby set the drive ratio of the transmission. The control devices include a motor (323), one or more magnetic powder clutches (110, 120, 640), a variable centroid system (662), and a mechanical pitch transfer gear system (950).

Abstract: Transmission systems are disclosed which include a dual sunwheel system having an output sunwheel (70) and a control sunwheel (80). A planet cage (18) is arranged around the dual sunwheel system and includes a planet gear (62) in mesh with the sunwheel (70) and a planet gear (64) in mesh with the sunwheel (80). The planet gears (62, 64) are coupled to one another. The drive ratio of the transmission is controlled by controlling the cage (18) or the control sunwheel (70). The speed of rotation of the input (22), output (20) and control sunwheel (70) are sensed by sensors (90) and control signals are generated to control a control device to thereby control the rotation of planet cage (18) or the control sunwheel (80) to thereby set the drive ratio of the transmission. The control devices can include a motor, one or more magnetic powder clutches, a variable centroid system and a mechanical pitch transfer gear system.

Abstract: Transmission systems are disclosed which include a dual sunwheel system having an output sunwheel (70) and a control sunwheel (80). A planet cage (18) is arranged around the dual sunwheel system and includes a planet gear (62) in mesh with the sunwheel (70) and a planet gear (64) in mesh with the sunwheel (80). The planet gears (62, 64) are coupled to one another. The drive ratio of the transmission is controlled by controlling the cage (18) or the control sunwheel (70). The speed of rotation of the input (22), output (20) and control sunwheel (70) are sensed by sensors (90) and control signals are generated to control a control device to thereby control the rotation of planet cage (18) or the control sunwheel (80) to thereby set the drive ratio of the transmission. The control devices can include a motor, one or more magnetic powder clutches, a variable centroid system and a mechanical pitch transfer gear system.