Power plants – Pressure fluid source and motor – Pulsator
Patent
1983-09-26
1986-07-29
Hershkovitz, Abraham
Power plants
Pressure fluid source and motor
Pulsator
91519, 92 52, 92108, 92113, 92152, F15B 700
Patent
active
046024816
ABSTRACT:
The actuator (12) comprises three main parts, an outer casing (20), a movable piston (28) and a fixed piston (36). A stepped outer portion (50, 52, 54) of the movable piston (28) cooperates with a stepped cavity (40, 42, 44) in the casing (20) to define a plurality of concentric, variable diameter fluid chambers (1, 2, 3) bounded at their ends by radial surfaces on the movable piston (20) and within the casing cavity. The movable piston (20) and the fixed piston (36) define a plurality of axially spaced apart variable diameter fluid chambers (1', 2', 3') which are bound on their ends by radial surfaces on the fixed piston (36) and radial surfaces within the cavity formed in the movable piston (20). One set of the chambers (1, 2, 3) is connected to supply pressure (P.sub.S) and the second set of chambers (1', 2', 3') is connected to return pressure (P.sub.R). Seal receiving grooves are formed in outer surface portions of the fixed and movable pistons (28, 36). Seal rings (S.sub.R) within these grooves seal against mating internal surfaces of the stepped cavities.
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Hydraulic System Analysis, by George R. Keller, published 1969, pp. 121-136.
Barnard Delbert J.
Hershkovitz Abraham
The Boeing Company
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