Rotating Shafts - Torque
Torsional moments acting on rotating shafts.
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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
Torque vs. Power and Revolutions Calculator
Power (hp)
Revolution speed (rpm)
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