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US 10,619,654 B2Granted
Fail-fixed hydraulic actuator
AssigneeHamilton Sundstrand Corporation
InventorTodd Haugsjaahabink
Life of this patent
Estimating the term…
Abstract
A method of operating a fail-fixed hydraulic actuator system is provided. The method includes providing an actuator in an initial position, electromechanically operating a valve assembly to hydraulically drive actuator movement and halting the hydraulic driving of the actuator movement by the valve assembly.
Claims18
A method of operating a fail-fixed hydraulic actuator system, the method comprising:
- providing an actuator in an initial position;
- electromechanically operating a valve assembly to hydraulically drive actuator movement relative to the initial position;
- and
- halting the hydraulic driving of the actuator movement by the valve assembly,
- wherein:
- the actuator comprises:
- a ramp toward which a lever configured to execute the halting is elastically biased;
- a body defining cavities on opposite sides of the ramp;
- and
- piping fluidly communicative with the cavities, and
- the valve assembly increases pressure in the cavities via the piping to hydraulically drive the actuator movement.
8 more elements
A fail-fixed hydraulic actuator system, comprising:
- an actuator disposable in an initial position;
- a valve assembly configured to hydraulically drive actuator movement relative to the initial position;
- a stepper motor assembly that initiates an hydraulic driving of the actuator movement by electromechanical operation of the valve assembly;
- and
- a lever that halts the hydraulic driving of the actuator movement by the valve assembly,
- wherein:
- the actuator comprises a ramp toward which the lever is elastically biased, a body defining cavities on opposite sides of the ramp and piping fluidly communicative with the cavities, and
- the valve assembly increases pressure in the cavities via the piping to hydraulically drive the actuator movement.
5 more elements
A fail-fixed hydraulic actuator system, comprising:
- a housing;
- a valve comprising a spool movable relative to the housing in accordance with a valve state and a sleeve movable relative to the spool;
- an actuator comprising a ramp, a body defining first and second cavities at first and second sides of the ramp, respectively, and first and second piping by which the first and second cavities are fluidly communicative with the spool, respectively, such that the actuator is hydraulically driven to move from an initial position upon a first movement of the spool relative to the housing until a second movement of the sleeve relative to the spool;
- a cam disposed to assume various positions to change the valve state;
- a stepper motor assembly that electromechanically controls the cam to occupy and move between the various positions to change the valve state and to thereby drive the first movement of the spool;
- and
- a lever that is elastically biased toward the ramp and which drives the second movement of the sleeve responsive to actuator movement.
4 more elements
Dependencies are inferred from the claim text.