jackshaft

American  

[jak-shaft, -shahft] / ˈdʒækˌʃæft, -ˌʃɑft /

noun

Machinery.

1. Also called countershaft.  a short shaft, connected by belting, gears, etc., that transmits motion from a motor or engine to a machine or machines being driven (main shaft ).

2. a shaft on which an idle wheel or fairlead turns.

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jackshaft British  

/ ˈdʒækˌʃɑːft /

noun

1. a short length of shafting that transmits power from an engine or motor to a machine

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Etymology

Origin of jackshaft

First recorded in 1895–1900; jack ¹ + shaft

Example Sentences

The connection to the outdrive is accomplished with a long jackshaft.

From Time Magazine Archive

With either power plant, the engine is separated from the sterndrive by a jackshaft, thus allowing the iron to be placed farther forward.

From Time Magazine Archive

Just as important, no clumsy jackshaft is needed.

From Time Magazine Archive

The jackshaft places the engine in the center of the boat away from the transom, improving performance and clearing the stern area for fishing.

From Time Magazine Archive

These little internal-gear sprockets were hung on double-shrouded pinions secured to each end of the jackshaft.

From The 1893 Duryea Automobile In the Museum of History and Technology by Berkebile, Donald H.