ring gear

ring gear

One of the gears in a planetary gear system. The teeth are on the inside of the ring gear, and the planetary gears mounted on pins fastened to the spider-like output shaft mesh with and ride between the inside the ring gear and the outside of the sun gear. The ring gear can be either rigidly mounted in the gear housing, or it can be driven by the input shaft, depending upon the gear ratio of the system. If the ring gear is rigidly mounted, the sun gear is driven by the input shaft.

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Industry/Domain: Aviation
Category: Aeronautics
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