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

1984-12-27

1987-07-14

Terapane, John F.

Ordnance

Shields

Shape or composition

89 3611, 744248R, F41H 504, F16H 118

Patent

active

046794859

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 caused cracking of the outer tubular member.

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patent: 4048365 (1977-09-01), Hoover
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Copies of pp. 22 and 32 from a brochure of Sundstrand Corporation, entitled, "Sundstrand Advanced Technology Group" and published more than a year prior to the filing date of this application.

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