Planetary transmission with planetary helical gears mounted on flexpin shafts

摘要

A planetary transmission unit 10, for a wind turbine, comprises, a sun gear, a ring gear and a pair of planet gears 11 mounted on a flexpin shaft 12 by means of bearings 13. Each of the planet gears 11 has helical teeth 14 and each pair of gears 11 has teeth with opposite helix angle to form chevron type teeth. The bearings 13 may be double row cylindrical tapered roller bearings and they may be integral with the planet gears 11. The sun gear and ring gear are of an unitary type.