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Gear ratio is the speed reduction/increase between input and output shafts. It determines torque multiplication and shaft speeds.
الصيغة
Ratio = N_input / N_output = N_driven / N_driver = T_output / T_input
دليل خطوة بخطوة
- 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
أمثلة محلولة
الإدخال
Input 1800 rpm, output 600 rpm
النتيجة
Gear ratio = 3:1 (3× speed reduction, 3× torque increase)
Power unchanged
أخطاء شائعة يجب تجنبها
- ✕Confusing speed ratio with force multiplication
- ✕Neglecting friction losses in extended calculations
أسئلة شائعة
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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