F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
138/84.1
F16J 10/02 (2006.01) B64C 13/40 (2006.01) F15B 15/14 (2006.01) F41H 5/04 (2006.01)
Patent
CA 1158527
BALLISTIC TOLERANT HYDRAULIC CONTROL ACTUATOR AND METHOD OF FABRICATING SAME ABSTRACT OF THE DISCLOSURE A ballistic tolerant control actuator in which a piston or other movable member is positioned within a structural hybrid cylindrical housing so as to form at least one chamber therewith to receive hydraulic actuating fluid, and wherein the hybrid housing comprises a structural outer wall of sufficient wall thickness "t" to withstand, without fatigue, the load requirements of the actuator. The housing also includes a central sleeve snugly fitted within the outer wall and fabricated of a material having low tensile strength in opposition to a load imparted radially inwardly thereagainst and high compressive load carrying capability with respect to loads imparted radially outwardly thereagainst, and being of selected wall thickness so that when the outer wall is impacted and/or penetrated by a projectile of diameter D, the ultimate tensile strength of the outer wall and the acoustic impedance ratio between the outer wall and central sleeve will cause impact induced stress waves from the outer wall to pass into the central sleeve with sufficient intensity to locally disintegrate and clear the central member in the vicinity of the projectile impact, and so that the petals formed in the outer wall and projecting inwardly into the space cleared in the central sleeve will not project farther radially inwardly than the petals which would be formed in the most critical case by a projectile whose diameter D -2- produced the ratio t/D = 1/3, so that the petals do not project radially inwardly beyond the central sleeve. The housing also includes an inner wall snugly fitted within the central sleeve and presenting a hard wear surface for the piston member and a chemical barrier area for the central sleeve, and that is of selected fracture toughness and residual strength such that the portion thereof adjacent the cleared central sleeve portion will be cleared therewith and so that any petals ballistically formed therein will be easily cleared by piston motion.
379423
Degnan William G.
Selleck Robert A.
Swabey Ogilvy Renault
United Technologies Corporation
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