Shaft Torque

Shaft torque is the rotational force exerted on or transmitted by a rotating shaft.  It is a measure of the twisting force applied to cause rotation or the force the shaft itself delivers to drive a load.  Torque is essential in mechanical systems where shafts transfer power from one component to another, such as in engines, gearboxes, and rotating machinery.  Shaft torque is a factor in determining the performance of rotating equipment such as motors, turbines, and automotive engines.  Higher torque allows a system to drive heavier loads or operate at lower speeds while maintaining power.

 

Shaft Torque Formula
\( \tau_s \;=\;  \tau \; J \;/\; r  \)     (Shaft Torque) \( \tau \;=\;  \tau_s \; r \;/\; J  \) \( J \;=\;  \tau_s \; r \;/\; \tau  \) \( r \;=\;  \tau \; J \;/\; \tau_s  \)
Symbol	English	Metric
\( \tau_s \)  (Greek symbol tau) = Shaft Torque	\(lbf-ft\)	\(N-m\)
\( \tau \)  (Greek symbol tau) = Shear Stress	\(lbf \;/\; in^2\)	\(Pa\)
\( J \) = Polar Momentum of Inertia	\(in^4\)	\(mm^4\)
\( r \) = Radius	\(ft\)	\(m\)