Axle
An axle is a shaft on which a wheel revolves or which revolves
with the wheel. (Also a solid beam that connects the two rear
wheels of the vehicle.) Axles help support the vehicle and,
in some cases, transmit torque to the drive wheels.
The axle ratio is the number of times the driveshaft rotates
to turn the axle shaft in one rotation. For example, if the
driveshaft gear has 10 teeth and the axle shaft gear has 30
teeth, the driveshaft gear must turn three times in order
to turn the axle shaft gear once. Thus the axle ratio is three-to-one
(3:1).
Source: Toyota
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