Optibelt ZRP - Page 37

36
4.3 ZRL-M Drive Design
Drive design of open-ended optibelt ZRL-M timing belting for linear drive
systems, z
emax
= 12
Timing belt and pulley designation
Quantity, type, width, section, pitch length, tension cord,
special construction if applicable
1 Optibelt ZRL-M timing belt 16 T5/6680 St
2 Optibelt ZRS pulleys 27 T5/42-2 Type 6F
2 Optibelt CP clamp plates CP-16 T5
Formulae Example
Timing belt and pulley width
Theoretical and standard belt width b
th
and b
st
b
th
=
Alternative:
b
th
=
b
St
from belt range on pages 30 to 31, b
St
≥ b
th
Can this belt width be accomodated?
Actual service factor c
2vorh
c
2vorh
= c
2
b
th
= = 15.0 mm
b
th
= = 15.0 mm
selected b
St
= 16 mm see page 31
Pulley width B = 27 mm, face width b
1
= 21 mm
c
2vorh
= 2.0 = 2.13
429 · 10
23.88 · 12
S
Bn3
· 10
S
spez
· z
e
M
B
· 10
M
spez
· z
e
14.4 · 10
0.80 · 12
b
St
b
th
16
15.0
Order example
Theoretical and actual pitch lengths L
wth
, L
wnom
L
wth
= 2 · a + z
1
· t for i = 1
z
R
=
L
wnom
= z
R
· t
L
wth
= 2 · 3236 + 42 · 5 = 6682 mm
z
R
= = 1336
L
wnom
= 1336 · 5 = 6680 mm
Actual centre distance a
nom
a
nom
= · t for i = 1
Centre distance allowances to be provided
a
nom
see Table 5.1, page 43;
installation: allowance y (ZRL)
tensioning: allowance x (ZRL)
y (ZRL) = y
1,2,3
(ZRL) depending on flanges
x (ZRL)
Allowances acceptable?
a
min
≤ a
nom
– y a
nom
+ x ≤ a
max
a
nom
= · 5 = 3235 mm
A tensioning pulley is necessary with fixed centres,
see page 45
Flanges on both pulleys y
1
(ZRL) ≥ 18 mm
x (ZRL) ≥ 1.5 + 0.002 · 3235 8.0 mm x (ZRL) ≥ 8mm
a
min
≤ 3217 mm 3243 mm ≤ a
max
z
R
– z
1
2
6682
5
1336 – 42
2
L
wth
t
Pitch length and drive centres with allowances
Calculation and setting of tension,
see page 40
Values for x
v
, F
v
, e
v
and S
a
see page 40