STOW LOCK PAWL FOR A RAT ACTUATOR

• Main Author: BANNON, David G
• Format: Patent
• Language: English; French; German
• Published: 07.04.2021
• Subjects: AIRCRAFT; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSIONTRANSMISSIONS IN AIRCRAFT; AVIATION; BLASTING; COSMONAUTICS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FLYING SUITS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; PARACHUTES; PERFORMING OPERATIONS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TRANSPORTING; WEAPONS

An actuator (24) for a ram air turbine system (10) includes a piston rod (42) that is cylindrical in shape and centered about a centerline (A), and stow lock pawls (48) supported by the piston rod (42) and able to move radially. Each of the stow lock pawls (48) has a crown (74) with a crown radius (r2). The actuator (24) further includes a lock bolt (52) extending along the centerline (A) radially within the piston rod (42) and configured to be axially movable within the piston rod (42) between a stowed position and a deployed position. The actuator (24) further includes rollers (57) radially outward from the centerline (A) configured to be guided by the lock bolt (52) and a cylinder (36) having a mating surface (68) with a mating radius (r2). The cylinder (36) is positioned radially outward from the piston rod (42) and configured to be axially movable between the stowed position and the deployed position. A ratio of the crown radius (r2) of the stow lock pawls (48) to the mating radius (r1) of the cylinder (36) is less than 0.98.