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Valve actuator differential worm planetary gear drive

  • US 4,896,562 A
  • Filed: 03/24/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 03/24/1988
  • Status: Expired due to Term
First Claim
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1. A valve actuator for controlling reciprocating motion of an elongated stem connected to the valve, comprising:

  • an elongated stem having helically-wound screw threads thereabout;

    a tubular-shaped drive sleeve having an internal bore therethrough with helically-wound threads engaging the threads of said stem;

    first and second, bi-directional, drive force input means to transmit an input force adjacent a said drive sleeve;

    first and second worms operatively connected to said first and second input means to receive rotational forces therefrom and transmit rotational forces;

    first and second axially spaced cylindrical gears, each have a bore therethrough, concentrically and rotationally mounted on said sleeve adjacent each said first and second worms and connected to receive a force transmitted from said first and second worms, respectively;

    a tubular-shaped sun gear of a first pre-determined diameter concentrically rotating with said first cylindrical gear about said drive sleeve;

    a tubular-shaped ring gear of a second, larger, predetermined diameter, adjacent said sun gear and concentrically rotating with said second cylindrical gear about said drive sleeve; and

    a plurality of right cylindrically-shaped planet gears operationally connected between said sun gear and said ring gear, each said planet gear fixedly held by a carrier arm connected to said drive sleeve whereby a rotational force transmitted by said first input device is transmitted to said ring gear and through said planet gears and then to said drive sleeve which moves said stem, and a rotational force transmitted by said second input device is transmitted to said sun gear and through said planet gears and then to said drive sleeve which moves said stem,

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