39
4.4 ZRL-V drive design
Drive design of
optibelt
ZRL-V
joined endless timing belts for conveyor systems,
z
emax
= 6, v
≤≤≤≤≤
2 m/s
Timing belt and pulley designation
Quantity, type, width, section, pitch length, tension cord,
special construction if applicable
2 Optibelt ZRL-V timing belts 50 T10/5360-V PAZ/PAR
4 Optibelt ZRS pulleys
66 T10/40-2 Type 6F
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
=
= 41.4 mm
b
th
=
= 41.3 mm
selected b
St
= 50 mm see page 27
Pulley width B = 66 mm, face width b
1
= 56 mm
c
2vorh
= 1.6
= 1.94
1177 · 10
47.41 · 6
S
Bn3
· 10
S
spec
· z
e
M
B
· 10
M
spec
· z
e
74.9 · 10
3.02 · 6
b
St
b
th
50
41.3
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 · 2478 + 40 · 10 = 5356 mm
z
R
=
= 536
L
wnom
= 536 · 10 = 5360 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 41;
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
=
· 10 = 2480 mm
A tensioning pulley is necessary with fixed centres,
see page 44
Flanges on both pulleys
y
1
(ZRL)
≤
25 mm
x (ZRL)
≤
3.5 + 0.002 · 2480 8.5 mm x (ZRL)
≤
9 mm
a
min
≤
2455 mm
2489 mm
≤
a
max
z
R
– z
1
2
5356
10
536 – 40
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 36
Summary of Contents for ZRL
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