Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1993-04-12
1995-09-26
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91410, 91416, 91437, 92136, 475 83, 475332, F15B 910
Patent
active
054526434
ABSTRACT:
A hydraulic power drive unit (36) including a linear hydraulic piston cylinder unit (64) with a set of longitudinally spaced gear teeth (84) in the form of a rack. A pinion gear (86) is operatively engaged and driven by the rack (84). A differential which may include a carrier (102), planet gears (108, 110) and sun gears (120, 122) may be driven by the pinion gear (86) to selectively transfer drive power to two separate rotary drive outputs (38, 40). A switching valve (160) may be provided which is responsive to a reversal of hydraulic supply pressure. Operation of the switching valve (160) may be limited by mechanical interference between an inhibit dog (181) and a cam surface (196) on the carrier (102). The carrier (102) may also include a separate cam surface (140) positioned for actuation of separate electrical switches (146, 148) in order to monitor position of the drive outputs (38, 40).
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Stewart, H. L., "Piston-Type Rotary Actuator" in Fluid Power, (Indiana, Bobbs-Merrill Educational Publishing) pp. 318-323.
Renzelmann Michael E.
Smith Mark H.
Bellamy Glenn D.
Lopez F. Daniel
The Boeing Company
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