Ballistic tolerant dual load path ballscrew and ballscrew actuat

Details Ballistic tolerant dual load path ballscrew and ballscrew actuat Ballistic tolerant dual load path ballscrew and ballscrew actuat

1985-12-06

1987-12-29

Terapane, John F.

Ordnance

Shields

Shape or composition

89 3611, 744248R, 428911, F41H 500, F16H 120, B64D 700

Patent

active

047152621

ABSTRACT:
Ballscrew actuators are well known for use as a primary flight control actuator for operating a flight control surface. The operation of the ballscrew actuator is critical to the success of an aircraft mission; however, when the actuator is subject to ballistic fire, a projectile hit which is not totally destructive can still render the actuator inoperable. Increasing the potential for operability of the ballscrew actuator after a projectile hit which is not totally destructive will increase the number of successful returns from aircraft missions.
The ballistic tolerant dual load path ballscrew actuator has a selectively-driven ballnut and a ballscrew drivingly connected to the ballnut. The ballscrew has an outer tubular member with an external helical ball groove providing a primary load path. An inner tubular member fits closely within and is fixed to the outer tubular member to provide a secondary load path upon cracking of the outer tubular member by a projectile passing through the outer tubular member. The inner tubular member is formed of ballistic tolerant composite material to maintain its structural integrity when contacted by a projectile which has passed through and cause cracking of the outer tubular member. In one embodiment, the inner tubular member has an outer energy absorbing layer of a ceramic material. In another embodiment, the inner tubular member is preloaded in tension to prevent propagation of a circumferential crack in the outer tubular member and is constructed of wound fibers providing ballistic tolerance and strength in torsion and tension.

REFERENCES:
patent: 3038352 (1962-06-01), Murphy
patent: 3722355 (1973-03-01), King
patent: 3974313 (1976-08-01), James
patent: 4161125 (1979-07-01), Degnan
patent: 4292882 (1981-10-01), Clausen
patent: 4300439 (1981-11-01), Degnan et al.
patent: 4449446 (1984-05-01), Degnan et al.
patent: 4608912 (1986-09-01), Navarette

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