Technical Manual - Plastorgomma Service

Drive Design
Formulae and Drive Design Examples
Formulae Calculation Example
Drive centre distance (provisional selection)
Recommendation: e > 0.5 (dpg + dpk) + 15 mm
e < 2 (dpg + dpk) Pitch length of the timing belt
L pth = 2 e + 1.57 (d pg – d pk) +
L pth see standard range pages 6 to 8
Drive centre distance from L pSt
e nom = K + K 2 –
L pst
π
K = – (dpg + dpk) 4 8
(d pg – d pk) 2
Allowance x for belt tensioning
x = 0.004 x e nom
Allowance y for belt installation
y = from table 15 page 30
8
(d pg – d pk) 2
4 e
e > 0.5 (339.57 + 80.85) + 15 = 225.21 mm
e < 2 (339.57 + 80.85) = 840.84 mm
e = 620 mm provisionally selected
Lpth (339.57 – 80.85)
= 2 x 620 + 1.57 (339.57 – 80.85) +
Lpth = 1927.05 mm
nearest standard timing belt length selected from page 8
2
4 x 620
L pSt = 1905 mm Type 750 H
enom = 311.15 + 311.152 enom = 608.5 mm
(339.57 – 80.85)
–
K = – (339.57 + 80.85)
K = 311.15
2
8
1905
4
π
8
x ≥ 2.4 mm
y ≥ 17 mm
17