Planetary gear system for a gas turbine engine
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United States of America Patent
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Aug 15, 1989
Grant Date -
N/A
app pub date -
Jan 7, 1987
filing date -
Jan 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A planetary gear transmission for use in gas turbine engines is provided which includes a gear case housing fixed to the engine housing, and a ring gear is fixed to the interior of the gear case housing in a cavity defined therein. A first stage planetary gear assembly is provided in the housing, including a first sun gear coupled to an output shaft of the engine, and a first planetary gear carrier is rotatably mounted in the housing. First planetary pinion gears are supported by the first carrier gears and mesh with the first sun gear and with the ring gear. A second stage planetary gear assembly is provided within the housing and comprises a second sun gear coupled to the first planetary carrier. The second stage planetary gear assembly includes a second planetary carrier coupled to a propeller shaft. The second carrier supports planetary pinion gears which mesh with the ring gear and the second gun gear. The first or second planetary gear carriers are exchangeable for a similar carrier with a planetary pinion gear arrangement effective to provide reverse rotation of the propeller shaft.
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