Technical Manual for Ribbed Belt Drives

Drive DesignFormulae and Drive Design MethodFormulaeCalculation ExampleRecalculation of speed of driven machineD r pactual =93 + 2 · 3.5d = 0.769e2 + 2 b er actual =d=123 + 2 · 3.5pnn24402 actual = = 3173 min -1n 2 actual = 10.769r actualRequired:3100 ± 100 min -1(Calculated speed meetsrequirement)d e1 + 2 b eC nom ≈ 380 – ≈ 367.65 mmDrive centre distance (suggested)Empfehlung: c > 0.7 (D e + d e )c < 2 (D e + d e )c = 380 mm suggestedEffective length of Ribbed BeltL eth ≈ 2 c + 1.57 (D e + d e ) + (D e – d e ) 24 cActual:β πα x πL eth = 2 c · sin + (D e + d e ) + (D e + d e )2 2180°(123 – 93) 2L eth ≈ 2 · 380 + 1.57 · (123 + 93) +4 · 380Nearest standard length from page 7 selectedL es = 1075 mm≈ 1099.7 mmDrive centre distanceCalculated from L es and L ethL es – L eth(when L es > L eth ) C nom ≈ C +2L es – L eth(when L es < L eth ) C nom ≈ C –2actual: πL es – (D e + d e )2C nom = +4[L es – (D e + d e )π24]2–(D e – d e ) 281099.7 – 10752Minimum allowances x/y above and belod drivecentre distance C nomx/y from table 3 page 11x ≥ 20 mm / y ≥ 25 mmBelt speedd pk · n k (d bk + 2 · h b ) · n k(93 + 2 · 3.5) · 3173v = = v = = 16.61 m/s19100 191001910016