Planetary gear transmission
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Sep 15, 2015
filing date -
Sep 15, 2014
priority date (Note) -
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Abstract
A planetary gear transmission has a gearbox, multiple stages of planetary gears, and an output shaft. Except for the last stage, each planetary gear stage shares a common first internal gear ring. Each stage has a sun gear, a planet carrier, and multiple planet gears. The sun gear of each stage, except for the first stage is integrally formed with or fixed to the planet carrier of an immediately preceding stage. The last stage of the transmission has a second internal gear ring. The planet gears of the last stage mesh with the second internal gear ring. The second internal gear ring includes a support portion, and the output shaft passes through and is rotatably supported by the support portion.
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