How to Calculate Gearbox Torque

Your gearbox produces a greater torque than that which enters it. The crankshaft's flywheel, which the engine's cylinders rotate, applies a torque to the gearbox's primary gear. The gear then turns a smaller counterpart with fewer teeth, rotating it with a greater speed. The car's drive shafts then carry this increased torque from the transmission to the rotors of the wheels, giving them enough force to drive the vehicle forward.

Instructions

1

Multiply the force applied to the box's first gear by the first gear's radius. If, for instance, 2,500 Newtons act on a gear whose radius measures 0.5 meters: 2,500 x 0.5 = 1,250 Newton meters.

2

Divide the radius of the first gear by that of the second. If the second gear's radius measures 0.1 meters: 0.5 / 0.1 = 5. The gearbox's torque ratio is 5:1, and its torque multiplication factor is 5.

3

Multiply the last two steps' answers: 1,250 x 5 = 6,250 Newton meters. This is the gearbox's torque.