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NO-BACK BRAKE FUNCTIONALITY MONITOR

  • US 20160369877A1
  • Filed: 06/17/2015
  • Published: 12/22/2016
  • Est. Priority Date: 06/17/2015
  • Status: Abandoned Application
First Claim
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1. A no-back device for an actuator having a ball screw subject to an axially directed load, the no-back device comprising:

  • a housing arranged to receive a portion of the ball screw, wherein the ball screw is mounted for rotation in first and second opposite rotational directions relative to the housing; and

    a first brake mechanism responsive when the axial load is in a first load direction, the first brake mechanism acting between the housing and the ball screw to produce a first torque resisting rotation of the ball screw in the first rotational direction and not substantially resisting rotation of the ball screw in the second rotational direction, wherein the first brake mechanism includes a first ratchet wheel and a first pawl, the first pawl being pivotally mounted to the housing by a first pivot pin, wherein the first pawl engages the first ratchet wheel to prevent rotation of the first ratchet wheel relative to the housing when the ball screw rotates in the first rotational direction and the first pawl permits rotation of the first ratchet wheel relative to the housing when the ball screw rotates in the second rotational direction;

    wherein the first pivot pin includes a first sensor generating a signal representative of the first torque produced by the first brake mechanism.

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