planet wheel

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planet wheel

A small planet wheel rotates around a larger sun gear inside a mechanical model.

Definition
  1. Noun:
    • A gear in an epicyclic gear train: A "planet wheel" is a specific component in a mechanical system. It is a gear that rotates around a central gear (called the sun gear) while also rotating on its own axis. It is part of a set that may include other planet wheels and an outer ring gear.
Usage
  • The term "planet wheel" is a technical, mechanical engineering term. It is used almost exclusively to describe the components of an epicyclic or planetary gear system.
  • It functions as a countable noun (e.g., , ).
Examples
  • Noun:
    • The mechanic replaced the damaged planet wheel in the automatic transmission.
    • In this model, the planet wheel meshes with both the sun gear and the ring gear.
    • The design uses four planet wheels for better load distribution.
Advanced Usage
  • "Planet gear": This is a more common and completely synonymous term for "planet wheel." In modern engineering contexts, "planet gear" is often preferred.
    • The planet gears are held in place by a carrier.
  • The system itself is called a planetary gear set or epicyclic gear train.
Variants and Related Words
  • Planet gear (n): A direct synonym for "planet wheel."
  • Sun gear (n): The central gear that the planet wheel(s) revolve around.
  • Ring gear / Annulus gear (n): The outer, internally-toothed gear that the planet wheel(s) also mesh with.
  • Planetary carrier / Carrier (n): The structure that holds the planet wheels and connects them to the output shaft.
  • Epicyclic gear train (n): The formal name for the entire gear system containing these components.
Synonyms
  • Planet gear
  • Planetary pinion (a less common term)
Related Phrases
  • Planetary gear set: The complete assembly containing sun gears, planet wheels, and a ring gear.
    • The helicopter's rotor drive uses a complex planetary gear set.
planet wheel

A small planet wheel rotates around a larger sun gear inside a mechanical model.

Noun
  1. an outer gear that revolves about a central sun gear of an epicyclic train

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