Gear box

6-2-185

A casing containing gears that can be engaged in various ratios to change the speed of a driven shaft relative to that of a driving shaft, usually in order to maintain the engine speed within limits of efficient operation.

The gearbox may also be used to reverse the sense of rotation of the driven shaft.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

English