Patent ID: 7581695

Claim:
An aircraft ( 1 ) comprising: a transmission ( 5 ) for transmitting motion from a driving member to a driven member; said transmission ( 5 ) comprising a first gear ( 8 ; 10 ) driven by said driving member and a second gear ( 10 ; 12 ) meshing with said first gear ( 8 ; 10 ) and in turn driving said driven member; each of said first and said second gears ( 8 , 10 ; 10 , 12 ) having teeth ( 16 , 17 , 18 ) shaped so that said first and second gears ( 8 , 10 ) mesh with one another at at least two pairs of respective simultaneously meshing teeth ( 16 , 17 ; 17 , 18 ); each of said teeth ( 16 , 17 , 18 ) of at least one of said first and second gears ( 8 , 10 , 12 ) has a profile ( 19 ) comprising a root portion ( 20 ) in the form of a starting theoretical involute (E) and an end portion ( 21 ) relieved with respect to said starting theoretical involute (E); a pattern (G) of the distance between the points of said end portion ( 21 ) and said starting theoretical involute (E) along an axis (A, H) of said tooth ( 16 , 17 , 18 ) comprising at least a first segment (B) and a second segment (C) sloping with respect to each other and with respect to said starting theoretical involute (E).