Rigid hydraulic control shaft and a control system for varying the pitch of a propeller
AssigneeEurocopter
InventorJean-Jacques Ferrier
Life of this patent
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Abstract
A rigid hydraulic control shaft for conveying a fluid from a hydraulic valve to a hydraulic chamber of a propeller comprises a main segment. The main segment has a hollow rigid outer tube and a solid rigid inner bar. The inner bar has an outer periphery and at least one longitudinal groove disposed along the outer periphery. The outer periphery is configured to move in rotation and translation with an inner periphery of the outer tube. The main segment is configured to move in rotation and in translation with a piston disposed adjacent to the hydraulic chamber.
Claims14
A rigid hydraulic control shaft for conveying a fluid from a hydraulic valve to a hydraulic chamber of a propeller, the control shaft comprising:
- a main segment having a hollow rigid outer tube and a solid rigid inner bar, the inner bar having an outer periphery and at least one longitudinal groove disposed along the outer periphery, wherein the outer periphery is configured to move in rotation and translation with an inner periphery of the outer tube, and the main segment is configured to move in rotation and in translation with a piston disposed adjacent to the hydraulic chamber.
A control system configured to vary a pitch of at least one blade of a propeller, the system comprising:
- a piston fastened to a projection of the at least one blade and configured to move in rotation with the blade about a longitudinal axis of the propeller;
- a hydraulic chamber adjacent to the piston, a pressure in the hydraulic chamber configured to move the piston in translation along the longitudinal axis;
- a hydraulic valve configured to adjust the pressure in the hydraulic chamber;
- and
- a rigid hydraulic control shaft configured to convey a fluid from the hydraulic valve to the hydraulic chamber and configured to move in translation and rotation with the piston, the control shaft having a main segment having a hollow rigid outer tube and a solid rigid inner bar, the inner bar having an outer periphery and at least one longitudinal groove disposed along the outer periphery, the outer periphery configured to move in rotation and translation with an inner periphery of the outer tube.
Dependencies are inferred from the claim text.