Actuating assembly for a thrust reverser of an aircraft engine

An actuating assembly for an aircraft engine thrust reverser, comprising:

• a drive shaft bearing a master pinion;
• a ball screw bearing a slave pinion engaging with said master pinion;
• a nut translating over the ball screw as a result of the rotation thereof;
• an extension tube secured to said nut, the extension tube comprising, at a free end thereof, a connection member for connecting to a portion of said reverser to be actuated;
• and
• locking means for blocking a rotation of said drive shaft, capable of immobilizing said portion in a so-called “direct jet” position of the reverser,
• wherein said locking means comprise an abutment secured to said drive shaft, and a cotter movable between a locking position in which it prevents a rotation of said abutment, and an unlocking position in which it allows the rotation of said abutment,
• wherein a reduction ratio (R) between said slave pinion and said master pinion is even.