planetary gear train – Ravigneaux gear set Interaction of the components of the planetary gear train. Ring gear, 2 sun wheels and planet carrier with 3 narrow and 3 wide planetary wheels are easily recognised through the Plexiglas screen. description ordernumber 1162 see also: multi-disk clutch assembly of differential gear with crownwheel four-speed transmission, suited for the technology lab electrical rack- and pinion steering