Optibelt ZRL, Technical Manual

Page: 36 / 98

35
Formulae Example
4.3 ZRL-M drive design
Drive design of open-ended
optibelt ZRL-M
timing belting for linear drive
systems, Z
emax
= 12
z
enom
= = 21
21
≥
z
emax
z
e
= z
emax
= 12
Number of teeth z
enom
in mesh
z
enom
= for i = 1, rounded down if necessary
Number of teeth in mesh z
e
considered z
emax
= 12
z
enom
≥
z
emax
z
e
= z
emax
z
enom
< z
emax
z
e
= z
enom
z
k
2
42
2
→
→
→
Belt section and number of teeth on pulleys
Section selection using permissible circumferential force
with maximum section width – see Table 4.3, page 41,
z
emax
= 12 S
zul
(section, b
max
)
≥
S
Bn3
Alternative:
Section selection using the torque/speed graph for
z
emax
= 12, p. 32, 33 with theoretical number of teeth z
1
z
1
= z
1
= z
2
= z
k
for i = 1
If z
1
°
z
2
, calculate the drive layout as for ZRM/ZRP pages 22 and 23
Section T5 S
zul
(T5, b
max
= 25 mm) = 720 N
≥
429 N
Section T see page 29
z
1
= = 41.7
d
w1th
·
π
t
66.4 ·
π
5
Selection of number of teeth z
1
and z
2
from the
standard pulley range, pages 50 to 82, pulley material
and fitting see Table 5.3, page 44
Are clearance diameters and permissible bore sizes acceptable?
Clearance diameter incl. space to fit belt > D
B
(or d
a
) + 2 · h
s
Alternative: design torque M
B
M
B
= c
2
· M
Ab
M
Ab
=
Effective belt speed v
eff
v
eff
=
T5 standard pulleys see page 79
z
1
= z
2
= 42 d
w1
= d
w2
= 66.85 mm
Diameter over flanges D
B
= 71 mm, bore d from 8 to 24 mm
Clearance diam. > 71 + 2 · 2.2 75.4 mm
≤
90 mm, h
s
see page 5
M
B
= 2.0 · 7.2 = 14.4 Nm M
Ab
= = 7.2 Nm
v
eff
= = 3.33
Nm
cm
Timing belt and pulley width
Transmissible circumferential force S
spec
see
Table 4.3, page 41 per tooth in mesh and 10
mm belt width
S
spec
= S
spec
(section)
Alternative:
Transmissible torque M
spec
see Table 4.3,
page 41 per tooth in mesh and 10 mm belt
width
M
spec
= M
spec
(section, z
k
)
S
spec
= S
spec
(T 5) = 23.88
M
spec
= M
spec
(T5, z
1
= 42) = 0.80 linearly interpolated
N
cm
S
n3
· d
d
2000
d
w1
· n
1
19100
66.85 · 950
19100
214.5 · 66.85
2000
m
s