epicyclic gear

a system of gears that has a central gear wheel around which others rotate, often within an outer ring

Japanese Meaning

中心の歯車の周囲を回転する他の歯車を備え、しばしば外枠内に配置される歯車系統。惑星歯車機構とも呼ばれる。

The engineer inspected the epicyclic gear for signs of wear before reinstalling the transmission.

エンジニアはトランスミッションを再取り付けする前に、摩耗の兆候がないか遊星歯車を点検した。

Sense（1）

a system of gears that has a central gear wheel around which others rotate, often within an outer ring

epicyclic gears

（ plural ）