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US 8,997,473 B2Granted
Electro-hydraulic actuator
AssigneeParker-Hannifin Corporation
InventorsMatthew Olson, James Prazak
Life of this patent
Estimating the term…
Abstract
An electro-hydraulic actuator (EHA) includes a hydraulic circuit having a plurality of pressure compensated flow control valves for limiting the maximum flow rate through the fluid conduits regardless of the loads imparted on the actuator. In one embodiment of the EHA, a plurality of combination manual override/thermal expansion valves that simplify the manufacture of the EHA.
Claims18
An electro-hydraulic actuator having:
- a hydraulic pump;
- an electric motor operatively connected to the hydraulic pump and operable for driving the pump;
- an actuator movable in response to fluid flow from the pump, the actuator including a piston movable in a cylinder and defining a piston side chamber and a rod side chamber;
- a housing for the pump, electric motor and actuator and including a reservoir, the housing including a manifold with fluid conduits for connecting the reservoir, the pump and the piston side and rod side chambers of the actuator;
- a plurality of pressure compensated flow control valves adapted to limit the maximum flow rate through the fluid conduits regardless of loads imparted on the actuator;
- and
- a plurality of combination manual release, thermal expansion valves received in the manifold and positioned in the fluid conduits.
4 more elements
An electro-hydraulic actuator having:
- a hydraulic pump;
- an electric motor operatively connected to the hydraulic pump and operable for driving the pump;
- an actuator movable in response to fluid flow from the pump, the actuator including a piston movable in a cylinder and defining a piston side chamber and a rod side chamber;
- a housing for the pump, electric motor and actuator and including a reservoir, the housing including a manifold with fluid conduits for connecting the reservoir, the pump and the piston side and rod side chambers of the actuator;
- a plurality of pressure compensated flow control valves adapted to limit the maximum flow rate through the fluid conduits regardless of loads imparted on the actuator;
- and
- a plurality of manual release valves adapted to provide a fluid connection between the actuator and the reservoir when the manual release valves are manually actuated;
- and
- wherein the plurality of manual release valves are fluidly connected directly to the actuator.
6 more elements
An electro-hydraulic actuator having:
- a hydraulic pump;
- an electric motor operatively connected to the hydraulic pump and operable for driving the pump;
- an actuator movable in response to fluid flow from the pump, the actuator including a piston movable in a cylinder and defining a piston side chamber and a rod side chamber;
- a housing for the pump, electric motor and actuator and including a reservoir, the housing including a manifold with fluid conduits for connecting the reservoir, the pump and the piston side and rod side chambers of the actuator;
- a plurality of pressure compensated flow control valves adapted to limit the maximum flow rate through the fluid conduits regardless of loads imparted on the actuator;
- and
- a filter for filtering fluid as the fluid returns to the reservoir from only the piston side chamber of the actuator.
4 more elements
An electro-hydraulic actuator having:
- a hydraulic pump;
- an electric motor operatively connected to the hydraulic pump and operable for driving the pump;
- an actuator movable in response to fluid flow from the pump, the actuator including a piston movable in a cylinder and defining a piston side chamber and a rod side chamber;
- a housing for the pump, electric motor and actuator and including a reservoir, the housing including a manifold with fluid conduits for connecting the reservoir, the pump and the piston side and rod side chambers of the actuator;
- and
- a plurality of combination manual release, thermal expansion valves received in the manifold.
3 more elements
Dependencies are inferred from the claim text.