Calcolatrice Trasmissione a Cinghia — Formula
## Belt Drive Speed and Belt Length
Belt drives transmit power between shafts using friction between a belt and pulleys.
### Speed Ratio
**N2 = N1 x D1 / D2** (assuming no belt slip)
### Belt Length (open drive)
**L = 2C + pi(D1 + D2)/2 + (D2 - D1)^2 / (4C)**
where C is the shaft centre distance. This approximate formula works well for standard configurations.
Belt drives transmit power between shafts using friction between a belt and pulleys.
### Speed Ratio
**N2 = N1 x D1 / D2** (assuming no belt slip)
### Belt Length (open drive)
**L = 2C + pi(D1 + D2)/2 + (D2 - D1)^2 / (4C)**
where C is the shaft centre distance. This approximate formula works well for standard configurations.
Esempio Risolto
150 mm driver at 1750 RPM driving a 300 mm pulley, centres 500 mm apart.
- Speed ratio = 300/150 = 2.0
- Driven speed = 1750 / 2.0 = 875 RPM
- Belt length = 2x500 + pi(150+300)/2 + (300-150)^2/(4x500)
- L = 1000 + 706.9 + 11.25 = 1718 mm