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US 11,592,072 B2Granted
Dynamic load damping apparatus
AssigneeThe Boeing Company
InventorJustin Christenson
Life of this patent
Estimating the term…
Abstract
A dynamic load damping apparatus is employed in a hydraulic steering system control circuit of an aircraft. The dynamic load damping apparatus is positioned in the hydraulic steering system control circuit in parallel with a control valve of the control circuit that functions as the hydraulic fluid source of the control circuit and an actuator that controls movements of a nose gear of the aircraft. The dynamic load damping apparatus dampens loads transmitted to the hydraulic actuator that controls the steering movements of the nose gear on the aircraft.
Claims20
A dynamic load damping apparatus comprising:
- a housing;
- a sleeve disposed in the housing, the sleeve having an interior bore that extends between a first end of the sleeve and a second end of the sleeve, the first end of the sleeve and the second end of the sleeve being at opposite ends of the sleeve;
- a spool valve disposed in the interior bore of the sleeve, the spool valve having a first land at a first end of the spool valve, the first land being adjacent to the first end of the sleeve, the spool valve having a second land at a second end of the spool valve, the second land being adjacent to the second end of the sleeve;
- wherein the spool valve has a third land at an intermediate portion of the spool valve between the first land and the second land;
- a first restricted conduit extends across the first land;
- a second restricted conduit extends across the second land;
- and,
- wherein the third land and the interior bore of the sleeve define an annular restricted passageway extending across the third land to provide fluid communication from one side of the third land to another side of the third land when the spool valve is centered inside of the interior bore of the sleeve.
5 more elements
A dynamic load damping apparatus comprising:
- a housing;
- a sleeve disposed in the housing, the sleeve having an interior bore that extends between a first end of the sleeve and a second end of the sleeve, the first end of the sleeve and the second end of the sleeve being at opposite ends of the sleeve, the interior bore having a first portion adjacent to the first end of the sleeve, the first portion of the interior bore having a first interior diameter dimension, the interior bore having a second portion adjacent to the second end of the sleeve, the second portion of the interior bore having a second interior diameter dimension, the interior bore having a third portion, the third portion of the interior bore being between the first portion of the interior bore and the second portion of the interior bore, the third portion of the interior bore having a third interior diameter dimension, the third interior diameter dimension being larger than the first interior diameter dimension and the second interior diameter dimension, the third portion of the interior bore is closed to outside of the sleeve;
- a spool valve disposed in the interior bore of the sleeve, the spool valve having a first land at a first end of the spool valve, the first land being adjacent to the first end of the sleeve and disposed in the first portion of the interior bore of the sleeve, the spool valve having a second land at a second end of the spool valve, the second land being adjacent to the second end of the sleeve and disposed in the second portion of the interior bore of the sleeve;
- a first restricted conduit extends across the first land;
- and,
- a second restricted conduit extends across the second land.
3 more elements
A method of damping dynamic loads in a hydraulic actuator, the method comprising:
- positioning a spool valve into an interior bore of a sleeve between a first end of the interior bore of the sleeve and a second end of the interior bore of the sleeve, the interior bore of the sleeve having a first portion adjacent to the first end of the sleeve and a second portion adjacent to the second end of the sleeve;
- positioning a first land at a first end of the spool valve adjacent to the first end of the sleeve within the first portion of the interior bore of the sleeve;
- positioning a second land at a second end of the spool valve adjacent to the second end of the sleeve within the second portion of the interior bore of the sleeve;
- communicating the first portion of the interior bore of the sleeve with an interior bore of an actuator on a first side of a piston within the interior bore of the actuator;
- communicating the second portion of the interior bore of the sleeve with the interior bore of the actuator on a second side of the piston within the interior bore of the actuator;
- extending a first restricted conduit across the first land of the spool valve;
- extending a second restricted conduit across the second land of the spool valve;
- communicating the first portion of the interior bore of the sleeve with the actuator through a first actuator conduit, the first actuator conduit having a cross-section area that is larger than a cross-section area of the first restricted conduit;
- communicating the second portion of the interior bore of the sleeve with the actuator through a second actuator conduit, the second actuator conduit having a cross-section area that is larger than a cross-section area of the second restricted conduit;
- and,
- positioning a third land at an intermediate portion of the spool valve between the first land and the second land, wherein the third land and the interior bore of the sleeve define an annular restricted passageway extending across the third land to provide fluid communication from one side of the third land to another side of the third land when the spool valve is centered inside of the interior bore of the sleeve.
8 more elements
Dependencies are inferred from the claim text.