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Gear ratio is the speed reduction/increase between input and output shafts. It determines torque multiplication and shaft speeds.
공식
Ratio = N_input / N_output = N_driven / N_driver = T_output / T_input
단계별 가이드
- 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
풀어진 예시
입력
Input 1800 rpm, output 600 rpm
결과
Gear ratio = 3:1 (3× speed reduction, 3× torque increase)
Power unchanged
피해야 할 일반적인 실수
- ✕Confusing speed ratio with force multiplication
- ✕Neglecting friction losses in extended calculations
자주 묻는 질문
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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