WIKTIONARY

differential gear

Noun

∙ An arrangement of bevel gears permitting the rotation of two shafts at two different speeds whilst supplying the same torque; used on the drive axles or between the driven wheels of automobiles to aid cornering.

BABYLON ENGLISH
differential gear
gear that permits a different speed for two adjacent axles, differential

WORDNET 2.0
differential gear
Noun
1. a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
(synonym) differential
(hypernym) bevel gear, pinion and crown wheel, pinion and ring gear

ENGLISH WIKIPEDIA - THE FREE ENCYCLOPEDIA
Differential (mechanical device)
A differential is a particular type of simple planetary gear train that has the property that the angular velocity of its carrier is the average of the angular velocities of its sun and annular gears. This is accomplished by packaging the gear train so it has a fixed carrier train ratio R = -1, which means the gears corresponding to the sun and annular gears are the same size. This can be done by engaging the planet gears of two identical and coaxial epicyclic gear trains to form a spur gear differential. Another approach is to use bevel gears for the sun and annular gears and a bevel gear as the planet, which is known as a bevel gear differential.
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