What's the difference between a shaft, an axle, a rod and a beam? - Quora: "A shaft is a rotating member, usually of circular cross section, used to transmit power or motion. It provides the axis of rotation, or oscillation, of elements such as gears, pulleys, flywheels, cranks, sprockets, and the like and controls the geometry of their motion.
An axle is a non rotating member that carries no torque and is used to support rotating wheels, pulleys, and the like. The automotive axle is not a true axle; the term is a carry-over from the horse-and-buggy era, when the wheels rotated on non rotating members.
A rod element supports tension, compression and axial torsion but not bending.
A beam element includes bending."
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