Modular propeller blade pitch actuation system
First Claim
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1. Apparatus for changing the pitch of a propeller blade mounted to a hub, said apparatus comprising:
- a housing removably disposed within said hub,driving means disposed with said housing for providing a high-torque rotational output to set the pitch of said propeller blade, said driving means comprising;
means for providing a rotational input,an hydraulic pump for impelling fluid, said pump attaching to and driven by said means for providing a rotational input,a high-speed hydraulic motor driven by said fluid impelled by said hydraulic pump, said motor providing a low-torque rotational output, andharmonic drive means attaching to and driven by said hydraulic motor for amplifying said low-torque rotational output to provide said high-torque rotational output, anda valve disposed within said housing communicating with said fluid impelled by said pump for controlling a flow of said fluid to said hydraulic motor thereby controlling said high-torque rotational output, andactuator means disposed within said housing and attaching to said valve for controlling the position of the valve to control said high-torque rotational output, and attaching to said high-torque rotational output for nulling the position of said valve.
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Abstract
A modular, easily replaceable, pitch actuation system is removably secured within the hub of an aircraft. The modular system houses a driving system which provides a rotational output to set the pitch of propeller blades mounted to the hub, and a pitch changing system that controls the driving system. The driving system includes a high-speed, low-torque hydraulic motor that drives an harmonic drive to amplify the torque of the motor. The pitch changing system includes an actuator which positions a valve that controls the hydraulic motor, and a nulling gear which repositions the valve and acts as a pitch lock.
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Citations
4 Claims
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1. Apparatus for changing the pitch of a propeller blade mounted to a hub, said apparatus comprising:
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a housing removably disposed within said hub, driving means disposed with said housing for providing a high-torque rotational output to set the pitch of said propeller blade, said driving means comprising; means for providing a rotational input, an hydraulic pump for impelling fluid, said pump attaching to and driven by said means for providing a rotational input, a high-speed hydraulic motor driven by said fluid impelled by said hydraulic pump, said motor providing a low-torque rotational output, and harmonic drive means attaching to and driven by said hydraulic motor for amplifying said low-torque rotational output to provide said high-torque rotational output, and a valve disposed within said housing communicating with said fluid impelled by said pump for controlling a flow of said fluid to said hydraulic motor thereby controlling said high-torque rotational output, and actuator means disposed within said housing and attaching to said valve for controlling the position of the valve to control said high-torque rotational output, and attaching to said high-torque rotational output for nulling the position of said valve. - View Dependent Claims (2, 3, 4)
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Specification