초록 ▼

A plurality of propeller blades are mounted to an axially elongated tubular propeller hub (H1). Each blade is rotatable in position about a radial axis. An electromechanical linear actuator (A1) is housed within the hub for rotating the blades to change their pitch. The actuator includes a rod membe

A plurality of propeller blades are mounted to an axially elongated tubular propeller hub (H1). Each blade is rotatable in position about a radial axis. An electromechanical linear actuator (A1) is housed within the hub for rotating the blades to change their pitch. The actuator includes a rod member (R1) fixed in position relative to the hub, a casing (C1) which can extend and retract relative to the rod member, a rotary electric motor (M1), and a planetary screw drive (SD1). The screw drive (SD1) drivingly interconnects the electric motor (M1) with the casing (C1) for causing the casing to move axially in response to operation of the motor. The actuator (A1) is connected to the propeller (P1) by a linkage (L1) so that movement of the casing causes the propellers to change their pitch. A second actuator (A2) may be housed within the hub (H1) and connected to the first actuator (A1) for providing redundancy in the event of failure of the first actuator.

대표청구항 ▼

An adjustable pitch propeller, comprising: an axially elongated tubular hub having a center axis; a plurality of propeller blades mounted on said hub, each for rotation in position about a radial axis; an electromechanical linear actuator housed within said hub, said actuator having a longitudinal a

An adjustable pitch propeller, comprising: an axially elongated tubular hub having a center axis; a plurality of propeller blades mounted on said hub, each for rotation in position about a radial axis; an electromechanical linear actuator housed within said hub, said actuator having a longitudinal axis coinciding with the axis of the hub, said actuator including: a rod member which is fixed in position relative to said hub, a casing which is extendible and retractable axially relative to said rod member, a rotary electric motor within said casing, said motor including a rotor, and, planetary screw drive transmission means within said casing drivingly interconnecting said rotor and said casing, for causing said casing to move axially relative to said rod member in response to operation of said motor; mechanical drive means interconnecting said casing and said propellers, for causing the propellers to rotate in position in response to axial movement of said casing; and compression spring means for maintaining an axial loading on the planetary screw drive transmission means in an amount sufficient to prevent slippage within the planetary screw drive transmission.