power train
Noun
Meaning
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed
Source: WordNetSynonyms
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Examples
A trailer can virtually double the loading capacity of a sturdy truck-another good reason for beefing up the power train.
the fool got his tie caught in the geartrain
That required reduction gearing, but building reduction gearing that could operate at high rpm and at high power was difficult, since a slight misalignment would shake the power train to pieces.
Sharing little in common with the rest of the line beyond power train, the sporty siblings caught auto enthusiasts' attention and established BMW as an international brand.