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 |
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\( \tau_s \;=\; \dfrac{ \tau \cdot J }{ r }\) (Shaft Torque) \( \tau \;=\; \dfrac{ \tau_s \cdot r }{ J }\) \( J \;=\; \dfrac{ \tau_s \cdot r }{ \tau }\) \( r \;=\; \dfrac{ \tau \cdot J }{ \tau_s }\) |
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| 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 | \(ft\) | \(m\) |
