US 9,284,042 B2Granted

System for controlling pitch variation of the blades of a propeller, a propeller, and an aircraft

AssigneeAirbus Helicopters

InventorsGérard Couderc, Mathilde Chouteau, Romuald Biest

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Abstract

A system (10) having a control plate (15) for controlling the pitch of the blades (5) of a propeller, a power block (20), and a directional control valve (30) for feeding said power block (20) with fluid. The power block (20) is sealed and includes at least a body in which at least one piston (22) that is secured to a piston rod (25) projecting from said body (21) is movable in translation, a repeater rod (50) connecting said piston rod (25) to said control plate (15). The control valve (30) is sealed and comprises a stationary manifold (35) and a movable manifold (40) that is movable in rotation, said stationary manifold (35) being controlled by a control lever (31) connected by repeater means (32) to said repeater rod (50). A respective pipe (60) connects each chamber (23, 24) of said power block (20) to said movable manifold (40).

Claims18

Dependent claims

A system for controlling pitch variation of blades of a propeller, the system comprising a control plate suitable for modifying the pitch of the blades, a power block suitable for moving the control plate in translation, and a directional control valve suitable for feeding the power block with fluid, wherein:

the power block is sealed, the power block including at least an outside body in which at least one piston moves in translation in a longitudinal direction, each piston separating a first chamber from a second chamber, each piston being secured to a piston rod that projects from the body, the body including fastener means for fastening to a hub of a propeller, and a repeater rod connecting the piston rod to the control plate;
the control valve is sealed, the control valve comprising a stationary manifold and a movable manifold that is movable in rotation, the control valve including a fastener system for fastening the movable manifold to the hub, the stationary manifold being controlled by a control lever connected by decoupling and position-repeater means to the repeater rod, the decoupling and position-repeater means including a cage co-operating with the repeater rod via at least one rolling bearing means, the cage being constrained to move in translation with the control lever;
and
the system including one pipe per chamber connecting each chamber of the power block to the movable manifold.

1 more element

A system for controlling pitch variation of blades of a propeller, the system comprising:

a control plate configured to modify blade pitch;
a sealed power block configured to move the control plate in translation, the sealed power block having an outer body configured to fasten to a propeller hub;
a sealed directional control valve configured to supply the sealed power block with fluid, the sealed directional control valve having a stationary manifold and a movable manifold, the movable manifold being configured to rotate, the sealed directional control valve being further configured to couple to a propeller hub;
a piston arranged to move within the outer body, the piston dividing the outer body into a first chamber and a second chamber;
a piston rod coupled to the piston and projecting from the outer body;
a repeater rod connecting the piston rod to the control plate;
a control lever configured to control the stationary manifold;
a repeater connecting the control lever to the repeater rod, wherein the repeater includes a cage co-operating with the repeater rod by at least one rolling bearing, the cage being constrained to move in translation with the control lever;
a first pipe connecting the first chamber to the movable manifold;
and
a second pipe connecting the second chamber to the movable manifold.

8 more elements

Dependencies are inferred from the claim text.