Patent ID: 8795123

Claim:
An epicyclic gear train ( 6 ), for an aircraft ( 1 ) capable of hovering, comprising: a sun gear ( 7 ) rotating about a first axis (A) and having external teeth ( 8 ); a fixed ring gear ( 9 ) having internal teeth ( 10 ) and positioned coaxially with said first axis (A) and radially outwards with respect to said sun gear ( 7 ); a number of planet gears ( 11 ), which have respective external teeth ( 12 ), are interposed between and mesh with the teeth ( 8 , 10 ) of said sun gear ( 7 ) and said ring gear ( 9 ), and rotate about respective second axes (B), in turn revolving about said first axis (A); and lubricant feed means ( 16 ) comprising a number of nozzles ( 17 ) arranged about said first axis (A) and said sun gear ( 7 ) to produce a flow (F) of said lubricant; the gear train being characterized in that said flow is an annular flow; and wherein said feed means ( 16 ) comprises a distributor ( 18 ) extending about said first axis (A) and having said nozzles ( 17 ), said distributor ( 18 ) comprising two substantially C-shaped conduits ( 19 ) located on diametrically-opposite sides of said first axis (A) with their respective concavities facing.