Planetary transmission unit with little play, with casing, hollow gear, sunwheel inside hollow gear, engaged planetary gears and carrier for them

摘要

The planetary transmission unit has a casing (2), a hollow gear (6), a concentric sunwheel (41) inside the hollow gear and several planetary gears (42-44) engaged with both. The planetary gears are on a carrier (45). The hollow gear has an annular disk region (61) fixed to the casing, a thin-walled cylindrical body region (63) and internal teeth.