Multiple displacement hydraulic motor drive apparatus
AssigneeMoog Inc.
InventorFranklin G. Miller
Life of this patent
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Abstract
A rotary power drive is provided for delivering a substantially constant horsepower over a wide speed range in one direction of rotation comprising two or more constant displacement hydraulic motive means operatively associated with a shaft to be driven thereby, an overrunning clutch operatively interposed between at least one of such motive means and said shaft, and means for supplying hydraulic drive fluid to such motive means in different combinations over different shaft speed ranges to provide a multiple displacement hydraulic motor drive apparatus.
Claims5
Variable speed drive apparatus for a shaft, comprising a first constant displacement rotary hydraulic motor drivingly associated with said shaft, at least one additional constant displacement rotary hydraulic motor drivingly associated with said shaft, overrunning clutch means operatively interposed between each such additional motor and said shaft, and single valve means arranged to meter the flow of hydraulic drive fluid to said motors to control their speed.
Variable speed drive apparatus for a shaft, comprising a plurality of constant displacement rotary hydraulic motors drivingly associated with said shaft, a first of said motors having a relatively high constant displacement, a second of said motors having a relatively lower constant displacement and a third of said motors having a relatively lowest constant displacement, single valve means arranged to meter the flow of hydraulic drive fluid to said motors to control their speed, a first blocking valve associated with said first motor, and a second blocking valve associated with said second motor, each of said first and second blocking valves being operative to communicatively connect its corresponding one of said first and second motors to said single valve means during a low range of rotative speed of said shaft, but only said second blocking valve being so operative during an intermediate speed range, and neither of said blocking valves being so operative during a high speed range.
Dependencies are inferred from the claim text.