An accumulator assembly for providing hydraulic fluid to an electrohydrostatic actuator, EHA, the assembly comprising: accumulator (1) for containing a supply of hydraulic fluid, the accumulator having an exit port via which hydraulic fluid can flow, in use, to the actuator; the assembly further comprising an accumulator refill arrangement fluidly connected to a supply of hydraulic fluid for refilling the accumulator via a fluid line (15) when a level of fluid in the accumulator is below a predetermined value, wherein the accumulator comprises a cylinder (10) defining a fluid chamber (11) and an accumulator piston (12) moveable within the cylinder relative to the chamber responsive to the fluid pressure, the refill arrangement including a spool (60) moveable across the fluid line between an open position, wherein fluid can flow along the fluid line from the supply (2) to the chamber, and a closed position, wherein the spool blocks the flow of fluid from the supply to the chamber and also from the chamber to the supply, and wherein the piston is linked to, and moves, a ramped surface (111) that engages the spool such that the contact force between the ramped surface and the spool varies as the piston moves relative to the chamber, whereby when the chamber is in a full state, the contact force is such as to locate the spool in the closed position and when the level of fluid is less than the predetermined value, the contact force is such as to locate the spool in the open position.
EHA ACCUMULATOR REFILLING ARRANGEMENT
EHA-AKKUMULATOR-WIEDERAUFFÜLLANORDNUNG
AGENCEMENT DE REMPLISSAGE D'ACCUMULATEUR EHA
2025-04-23
Patent
Electronic Resource
English