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Modular propeller blade pitch actuation system

  • US 4,750,862 A
  • Filed: 11/28/1986
  • Issued: 06/14/1988
  • Est. Priority Date: 11/28/1986
  • Status: Expired due to Fees
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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