Aeronautics and astronautics – Aircraft control – Automatic
Patent
1986-10-17
1988-04-19
Garrett, Robert E.
Aeronautics and astronautics
Aircraft control
Automatic
244213, 92 31, 92140, 92 76, 74 99R, 74107, 74 8915, 744248R, B64C 1336
Patent
active
047384158
ABSTRACT:
A fluid-powered rotary actuator particularly well suited for use in operating an aircraft flight control surface. The body has a stationary body portion and a rotatable body portion with an elongated annular sleeve reciprocally and coaxially mounted within the body. A tie-rod coaxially projects through the sleeve from end-to-end between the stationary and rotatable body portions to maintain their relative longitudinal position against axial separation during actuator operation. To each axially outward side of the sleeve is an annular ball deflector. The axially outward portions of the sleeve and the corresponding portions of the stationary and rotatable body portions have helical ball races formed therein to transmit torque between the body portions and the sleeve to cause the rotatable body portion to rotate in response to fluid-powered linear reciprocation of the sleeve. The sleeve further includes a radially recessed intermediate portion with an intermediate ball race which connects together the ball races of the axially outward sleeve portions. A recirculation ball race is positioned radially inward from the outward sleeve ball races and serves to channel balls between the deflectors. In combination, the ball races form six endless ball circuits. A piston is mounted on each of the two mounting portions of the sleeve extending longitudinally outward from each axially outward end of the sleeve.
REFERENCES:
patent: 3162098 (1964-12-01), Lindberg
patent: 4134329 (1979-01-01), Belliere
patent: 4590816 (1986-05-01), Weyer
patent: 4691582 (1987-09-01), Weyer
Denion Thomas E.
Garrett Robert E.
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