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Gear ratio is the speed reduction/increase between input and output shafts. It determines torque multiplication and shaft speeds.
Formule
Ratio = N_input / N_output = N_driven / N_driver = T_output / T_input
Guide étape par étape
- 1Ratio = N_input / N_output = N_driven / N_driver = T_output / T_input
- 2Spur gears: ratio = number of teeth on driven / number on driver
- 3Power is conserved: P = T × ω
Exemples résolus
Entrée
Input 1800 rpm, output 600 rpm
Résultat
Gear ratio = 3:1 (3× speed reduction, 3× torque increase)
Power unchanged
Erreurs courantes à éviter
- ✕Confusing speed ratio with force multiplication
- ✕Neglecting friction losses in extended calculations
Questions fréquentes
Can any two gears mesh together?
No, they must have same pressure angle and pitch. Teeth must fit smoothly without interference.
How is efficiency handled?
Mechanical power loss (5-10%) converts to heat; P_out = P_in × η.
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