Control of shifting transmission for constant and variable frequency systems

摘要

A transmission for providing mechanical power from an input includes a transmission assembly having an arm configured and adapted to be connected to a mechanical input for rotation at an input speed. A first planet is rotatably mounted to a first end of the arm. A trim ring operatively contacts the first planet for mutual rotation therewith. A brake is operatively connected to the trim ring for controlling rotation of the trim ring. A second planet is rotatably mounted to a second end of the arm. The second planet operatively contacts the first planet for mutual rotation therewith. An output ring operatively contacts the second planet for mutual rotation therewith to rotate at an output speed based on an input speed of the arm and a trim speed of the trim ring.

主权项

1. A transmission for providing mechanical power from an input comprising:
a transmission assembly including an arm configured and adapted to be connected to a mechanical input for rotation at an input speed; a first planet rotatably mounted to a first end of the arm; a trim ring operatively contacting the first planet for mutual rotation therewith; a brake operatively connected to the trim ring for controlling rotation of the trim ring; a second planet rotatably mounted to a second end of the arm, wherein the second planet operatively contacts the first planet for mutual rotation therewith; and an output ring operatively contacting the second planet for mutual rotation therewith to rotate at an output speed based on an input speed of the arm and a trim speed of the trim ring, wherein the brake is configured and adapted to shift the transmission assembly from a first condition in which the trim ring is held stationary relative to the arm, and a second condition in which the trim ring and arm rotate together, further comprising an overrunning clutch operatively connecting the arm to the trim ring to allow relative rotation of the arm and trim ring in the first condition and when shifting between the first and second conditions, and to allow common rotation of the arm and trim ring in the second condition, preventing rotation speed of the trim ring exceeding input rotation speed of the arm.