Electro-hydraulic actuator with mechanical servo position feedback
First Claim
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1. An electro-hydraulic actuator comprising:
- a single stage servomechanism;
a current versus load generator, said current versus load generator being capable of energizing said single stage servomechanism with an input force, said input force controlling said single stage servomechanism to regulate a regulated servo pressure controlled by said electro-hydraulic actuator, wherein said load generator includes a solenoid creating said input force;
a control orifice;
a flapper valve pivotably connected to said load generator and operatively engaged with said control orifice for regulating a hydraulic fluid, wherein said flapper valve is spring-biased; and
a mechanical feedback device producing a mechanical feedback force for offsetting said input force of the load generator, wherein said mechanical feedback force provides closed loop control of said electro-hydraulic actuator, wherein said mechanical feedback device includes a roller assembly producing said mechanical feedback force, and a lever assembly, said lever assembly being operatively connected to said roller assembly to transfer said mechanical feedback force to said load generator and operatively connected to said cam follower engaged with the sloped cam surface.
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Abstract
A method and apparatus for an electro-hydraulic actuator (1) having mechanical feedback provide closed loop control with a high degree of accuracy. The electro-hydraulic actuator (1) includes a current versus load generator (10), a single-stage servomechanism (20, 21, 22, 23), and a device (24, 25, 40, 41) for providing a mechanical feedback force for offsetting an input force (Fsol) of the current versus load generator (10).
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Citations
11 Claims
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1. An electro-hydraulic actuator comprising:
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a single stage servomechanism;
a current versus load generator, said current versus load generator being capable of energizing said single stage servomechanism with an input force, said input force controlling said single stage servomechanism to regulate a regulated servo pressure controlled by said electro-hydraulic actuator, wherein said load generator includes a solenoid creating said input force;
a control orifice;
a flapper valve pivotably connected to said load generator and operatively engaged with said control orifice for regulating a hydraulic fluid, wherein said flapper valve is spring-biased; and
a mechanical feedback device producing a mechanical feedback force for offsetting said input force of the load generator, wherein said mechanical feedback force provides closed loop control of said electro-hydraulic actuator, wherein said mechanical feedback device includes a roller assembly producing said mechanical feedback force, and a lever assembly, said lever assembly being operatively connected to said roller assembly to transfer said mechanical feedback force to said load generator and operatively connected to said cam follower engaged with the sloped cam surface. - View Dependent Claims (2)
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3. An electro-hydraulic actuator comprising:
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a single stage servomechanism, wherein said single stage servomechanism includes a power piston including a sloped cam surface; and
a cam follower, said cam follower operatively engaged with said sloped cam surface of said power piston;
a current versus load generator, said current versus load generator being capable of energizing said single stage servomechanism with an input force, said input force controlling said single stage servomechanism to regulate a regulated servo pressure controlled by said electro-hydraulic actuator; and
a mechanical feedback device producing a mechanical feedback force for offsetting said input force of the load generator, wherein said mechanical feedback force provides closed loop control of said electro-hydraulic actuator through said cam follower, wherein said mechanical feedback device includes a roller assembly producing said mechanical feedback force, and a lever assembly, said lever assembly being operatively connected to said roller assembly to transfer said mechanical feedback force to said load generator and operatively connected to said cam follower engaged with the sloped cam surface. - View Dependent Claims (4, 5, 6)
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7. An electro-hydraulic actuator comprising:
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a single stage servomechanism, wherein said single stage servomechanism includes a power piston including a sloped cam surface;
a cam follower, said cam follower operatively engaged with said sloped cam surface of said power piston;
a current versus load generator, said current versus load generator being capable of energizing said single stage servomechanism with an input force, said input force controlling said single stage servomechanism to regulated a regulated servo pressure controlled by said electro-hydraulic actuator;
a mechanical feedback device producing a mechanical feedback force for offsetting said input force of the load generator, wherein said mechanical feedback force provides closed loop control of said electro-hydraulic actuator through said cam follower, wherein said mechanical feedback device includes a roller assembly producing said mechanical feedback force, and a lever assembly, said lever assembly being operatively connected to said roller assembly to transfer said mechanical feedback force to said load generator;
a control orifice; and
a flapper valve pivotably connected to said load generator and operatively engaged with said control orifice. - View Dependent Claims (8, 9, 10, 11)
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Specification