gearbox
gearbox — noun
- gearboxsingular
- gearboxesplural
1. the sealed metal case in a vehicle or machine that contains the gear system and
the sealed metal case in a vehicle or machine that contains the gear system and transfers the engine’s power to the wheels or other moving parts
The mechanic Jabari removed the gearbox to check the damaged gears inside the old truck.
collocation: remove / check / replace the gearbox
A loud grinding noise from the gearbox told Vikram that the car needed immediate repairs.
When the gearbox failed on the highway, Emma called a tow truck for help.
The gearbox sends engine power to the wheels through a carefully matched set of gears.
Femi learned in driving school how the gearbox changes the wheels’ speed and force.
- transmission
broader term — the transmission includes the gearbox plus other parts such as the clutch and torque converter; in everyday speech the two words are sometimes used interchangeably
- gear case
more technical and less common in ordinary driving conversation; used mainly in repair manuals and industrial settings
用法筆記
Frequently used in the context of cars, trucks, and motorcycles, but also applies to industrial machinery that uses gears to change speed or direction.
常見錯誤
❗ 'The gearbox in my car is broken, so I need a new engine.' ✅ 'The gearbox in my car is broken, so I need a new gearbox.' — the gearbox and the engine are two separate parts; a gearbox problem does not mean the engine needs replacing.
❗ 'The mechanic changed the gearbox oil and the transmission fluid as two separate jobs.' ✅ 'The mechanic changed the gearbox oil as part of the transmission service.' — on most vehicles the gearbox is a major component inside the transmission system; they are not unrelated parts.