sun gear

noun

The central gear wheel of an epicyclic gear train; the central gear in planetary gear box, which spins the planet gears

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Meanings

nounsun gear (plural sun gears)

plural sun gears

  1. The central gear wheel of an epicyclic gear train; the central gear in planetary gear box, which spins the planet gears

Synonyms & antonyms

Also see
sun wheel

Origin

By analogy to a sun with planets rotating around it.

Full word history & related roots →

Translations

Dutch zonnewiel
  • zonnewielgear wheel
French planétaire intérieur, soleil
  • planétaire intérieurgear wheel
  • soleilgear wheel
Cite this entry
APA

sun gear. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/sun%20gear

MLA

“sun gear.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sun%20gear. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “sun gear,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/sun%20gear.

Source: sun gear on Wiktionary, CC BY-SA 4.0.