System of contra-rotating propellers driven by a planetary gear train providing a balanced distribution of torque between the two propellers
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United States of America Patent
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Nov 4, 2014
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app pub date -
Dec 17, 2009
filing date -
Dec 19, 2008
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Abstract
A system of contra-rotating propellers for an aircraft turbomachine, including: a free power turbine including a first rotor; first and second propellers; and a mechanical transmission system including a planetary gear train fitted with a sun gear driven by the rotor, at least one planet gear driving the first propeller, and a ring driving the second propeller. The free power turbine also includes a second rotor that is contra-rotating relative to the first rotor, and rotating the ring.
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