Abstract: A toothed wheel gear unit for a compressor system includes a central wheel gear (5) which drives output shafts (9) connected with one or more compressors by way of pinions (7) on the output shafts (9). On at least one of the output shafts (9a) the pinion forms the sun gear of a planetary gear (15). The planet carrier (23) of the planetary gear (15) is held stationary, and the ring gear (17) of the planetary gear (15) has outer teeth (27) in engagement with the central wheel (5) and inner teeth meshing with the planet gears (21) rotatably supported on the planet-carrier (23).

Abstract: A power splitting transmission, particularly for high energy and/or for high rotational speeds. Two sun gears are connected to the shaft of a drive starting and stopping mechanism and are coupled to each other by at least three double power splitting gears which are arranged equidistantly about the circumference of the sun gears and connected thereto by a coupling. The coupling and the connection with the shaft of the drive starting and stopping mechanism together function as a membrane coupling.