Quasi-open loop hydraulic ram incremental actuator with power conserving properties
An electric stepping motor, operated by command signals from a computer or a microprocessor, rotates a rotary control member of a distributor valve, for sequencing hydraulic pressure and hence flow to the cylinders of an axial piston hydraulic machine. A group of the cylinders are subjected to pressure and flow and the remaining cylinders are vented to a return line. Rotation of the rotary control valve member sequences pressurization by progressively adding a cylinder to the forward edge to the pressurized group and removing a cylinder from the trailing edge of the pressurized group. The double ended pistons of each new pressurized group function to drive a wobble plate into a new position of equilibrium and then hold it in such position until another change in the makeup of the pressurized group. These pistons also displace hydraulic fluid from the opposite cylinder head which serves as the output of a pumping element. An increment of displacement of the wobble plate occurs in direct response to each command pulse that is received by the stepping motor. Wobble plate displacement drives the rotary valve of the hydraulic power transfer unit, causing it to transfer hydraulic fluid from a first expansible chamber on one side of a piston in a hydraulic ram to a second expansible chamber on the opposite side of the piston. Reverse drive of the hydraulic power transfer unit reverses the direction of transfer of hydraulic fluid between the two expansible chambers.
- Assignee:
- Boeing Co.
- Patent Number(s):
- US 4363211
- OSTI ID:
- 6522490
- Resource Relation:
- Patent File Date: Filed date 1 Feb 1980; Other Information: PAT-APPL-117551
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ACTUATORS
CONTROL SYSTEMS
AIRCRAFT
PUMPS
HYDRAULIC EQUIPMENT
CYLINDERS
ELECTRIC MOTORS
ENERGY CONSERVATION
FLUID FLOW
OPEN-LOOP CONTROL
PISTONS
ROTATION
SIGNALS
VALVES
CONTROL
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MOTION
MOTORS
420200* - Engineering- Facilities
Equipment
& Techniques
320201 - Energy Conservation
Consumption
& Utilization- Transportation- Air & Aerospace