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US 8,783,291 B2Granted
Servo valve
AssigneeLiebherr-Aerospace Lindenberg GmbH
InventorsFranz Weixler, Florian Lau
Life of this patent
Estimating the term…
Abstract
The present invention relates to a two-stage electrohydraulic servo valve with a first stage, which operates as pilot stage and includes a movable nozzle tube, and a second stage which operates as power stage, wherein the nozzle tube of the pilot stage is guided by means of a torsion element and the oil supply of the movable nozzle tube is integrated in the torsion element.
Claims18
A two-stage electrohydraulic servo valve with a first stage (1), which operates as pilot stage and includes a movable nozzle tube (10), and a second stage (2) which operates as power stage, wherein
- the first stage (1) additionally comprises an integral a torsion element (11), with the nozzle tube (10) of the pilot stage (1) mounted upon and guided by the integral torsion element (11) and an oil supply of the movable nozzle tube (10) integrated in the torsion element (11),
- a base plate (17), with opposite ends of the integral torsion element (11) affixed to the same base plate (17), and
- the second stage (2) comprises a control piston or slide (3) reciprocally mounted therein and a return spring (6) engaging the control piston or slide (3) and firmly connected with the nozzle tube (10) to generate an increasingly reverse torque on the nozzle tube (10) until the nozzle tube (10) swivels back into vertical neutral position.
Dependencies are inferred from the claim text.