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Gear ratio is the speed reduction/increase between input and output shafts. It determines torque multiplication and shaft speeds.
Formel
Ratio = N_input / N_output = N_driven / N_driver = T_output / T_input
Trin-for-trin guide
- 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
Løste eksempler
Input
Input 1800 rpm, output 600 rpm
Resultat
Gear ratio = 3:1 (3× speed reduction, 3× torque increase)
Power unchanged
Almindelige fejl at undgå
- ✕Confusing speed ratio with force multiplication
- ✕Neglecting friction losses in extended calculations
Ofte stillede spørgsmål
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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