ers ▁Category : M embers ▁of ▁the ▁Order ▁of ▁the ▁British ▁Empire <0x0A> </s> ▁The ▁R avig ne aux ▁g ear set ▁is ▁a ▁double ▁planet ary ▁g ear ▁set , ▁invent ed ▁by ▁Pol ▁R avig ne aux , ▁who ▁file d ▁a ▁pat ent ▁application ▁on ▁July ▁ 2 8 , ▁ 1 9 4 9 , ▁in ▁Neu illy - sur - Se ine ▁France . ▁ ▁This ▁planet ary ▁g ear ▁set , ▁commonly ▁used ▁in ▁automatic ▁transm issions , ▁is ▁constructed ▁from ▁two ▁g ear ▁pairs , ▁ring - plan et ▁and ▁planet - plan et . ▁▁ ▁The ▁R avig ne aux ▁set ▁has ▁two ▁sun ▁g ears , ▁a ▁large ▁sun ▁and ▁a ▁small ▁sun , ▁and ▁a ▁single ▁planet ▁car rier , ▁holding ▁two ▁sets ▁of ▁planet ary ▁g ears , ▁inner ▁plan ets ▁and ▁outer ▁plan ets . ▁The ▁car rier ▁is ▁one ▁sub - assembly ▁but ▁has ▁two ▁rad ii ▁to ▁couple ▁with ▁the ▁inner ▁and ▁outer ▁plan ets , ▁respectively . ▁The ▁two ▁sets ▁of ▁planet ▁g ears ▁rotate ▁independently ▁of ▁the ▁car rier ▁but ▁co - rotate ▁with ▁a ▁fixed ▁g ear ▁ratio ▁with ▁respect ▁to ▁each ▁other . ▁The ▁inner ▁plan ets ▁couple ▁with ▁the ▁small ▁sun ▁g ear ▁and ▁co - rotate ▁at ▁a ▁fixed ▁g ear ▁ratio ▁with ▁respect ▁to ▁it . ▁The ▁outer ▁plan ets ▁couple ▁with ▁the ▁large ▁sun ▁g ear ▁and ▁co - rot ates ▁with ▁a ▁fixed ▁g ear ▁ratio ▁with ▁respect ▁to ▁it