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# Rotating Shafts - Torque

## Torsional moments acting on rotating shafts.

A torsional moment or torque acting on a rotating shaft can be expressed as

T = Php 33000 12 / (2 π w)

= 63057 Php / n                            (1)

where

T = torque - or moment (lb in)

Php= horsepower (hp)

n = revolution per minute (rpm)

• 1 hp (English horse power) = 745.7 W
• 1 lb in = 0.113 Nm

#### Example - Car Engine Torque vs. Power and RPM

A car combustion engine deliveres 100 hp at 5000 rpm to the shaft. The torque in the shaft can be calculated as

T = 63057 (100 hp) / (5000 rpm)

= 12611 lb in

= 143 Nm

## Related Topics

• ### Mechanics

Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.

## Related Documents

• ### Electric Motors - Torque vs. Power and Speed

Electric motor output power and torque vs. rotation speed.
• ### Flywheels - Kinetic Energy

The kinetic energy stored in flywheels - the moment of inertia.
• ### Mass Moment of Inertia

The Mass Moment of Inertia vs. mass of object, it's shape and relative point of rotation - the Radius of Gyration.
• ### Modulus of Rigidity

Shear Modulus (Modulus of Rigidity) is the elasticity coefficient for shearing or torsion force.
• ### Shafts Torsion

The torsion of solid or hollow shafts - Polar Moment of Inertia of Area.
• ### Stress in Thin-Walled Cylinders or Tubes

Hoop and longitudinal stress thin-walled tubes or cylinders.
• ### Torque - Work done and Power Transmitted

The work done and power transmitted by a constant torque.

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## Citation

• The Engineering ToolBox (2005). Rotating Shafts - Torque. [online] Available at: https://www.engineeringtoolbox.com/moment-rotating-shaft-d_952.html [Accessed Day Month Year].

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12.8.9