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power steering

noun, Automotive.
1.
an automotive steering system in which the engine's power is used to supplement the driver's effort in turning the steering wheel.
Origin
1930-1935
1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for power-steering

power steering

noun
1.
a form of steering used on vehicles, where the torque applied to the steering wheel is augmented by engine power Also called power-assisted steering
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for power-steering

power steering

system to aid the steering of an automobile by use of a hydraulic device (driven from the engine) that amplifies the turning moment, or torque, applied to the steering wheel by the driver. To reduce the torque required from the driver as cars became heavier and tires softer, gears were introduced between the steering wheel shaft and the linkage that turns the wheels. The gears multiplied the torque supplied by the driver to a much greater torque on the shaft that drives the front wheels to right or left. A disadvantage arose, however, in the higher steering ratio required; i.e., amount of turn of the steering wheel needed.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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