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Driveshaft
mechanical component for transmitting torque and rotation / From Wikipedia, the free encyclopedia
A driveshaft, drive shaft, driving shaft, propeller shaft, or Cardan shaft is a part of a machine that takes power from the engine or motor to a place where useful work can be done.
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Most engines or motors create power as torque by making something rotate. This can be from an internal combustion engine (as in a car), water driving a water wheel, or gas or water going through a turbine. This rotating power is called torque. The load that is turned creates torsion and shear stress. Drive shafts need to be strong enough to take this stress. A light drive shaft will more efficiently move the power to the load, so there needs to be a balance between strength and weight.