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Minimum number of teeth and minimum diameter
Drive without reverse bending
• Timing pulley z
min
= 15
• Idler running on belt teeth d
min
= 120 mm
Drive with reverse bending and double sided belt
• Timing pulley z
min
= 25
• Idler running on belt back d
min
= 120 mm
rpm
[min
-1
]
M
spez
[Ncm/cm]
P
spez
[W/cm]
rpm
[min
-1
]
M
spez
[Ncm/cm]
P
spez
[W/cm]
rpm
[min
-1
]
M
spez
[Ncm/cm]
P
spez
[W/cm]
0
1200
3400
20
1300
3600
40
1400
3800
60
1440
4000
80
1500
4500
100
1600
5000
200
1700
5500
300
1800
6000
400
1900
6500
500
2000
7000
600
2200
7500
700
2400
8000
800
2600
8500
900
2800
9000
1000
3000
9500
1100
3200
10000
Tooth shear strength
Other widths are available on request
ELA-flexSD
™
Technical data
Belt width [mm]
Allowable tensile load [N]
Weight [kg/m]
25
32
50
75
100
150
4000 5100 7900 11900 15800 23700
0,18 0,23 0,37 0,55 0,73 1,1
Belt characteristics
• Truly endless polyurethane timing belt with steel
tension cords according to DIN 7721 T1
• Metric pitch 20 mm
• Ideal for dr ives where high belt flexibi lity is
requested
• Transmissible power up to 100 kW
• Rpm up to 6.000 [1/min]
• Maximum width:
150 [mm]
• Width tolerance:
±1,0 [mm]
• Thickness tolerance:
±0,2 [mm]
Flexibility
33,263 0,000
32,181 0,674
31,242 1,309
30,424 1,911
29,714 2,489
29,097 3,047
26,579 5,566
24,777 7,783
23,393 9,798
22,269 11,659
21,320 13,395
20,502 15,028
19,783 16,572
19,140 18,038
18,561 19,435
18,029 20,766
11,510 40,978
11,173 42,117
10,851 43,178
10,546 44,170
9,842 46,377
9,209 48,213
8,639 49,753
8,114 50,976
7,630 51,931
17,542 22,042
17,093 23,268
16,673 24,442
16,511 24,896
16,278 25,568
15,909 26,654
15,562 27,702
15,234 28,714
14,922 29,689
14,623 30,624
14,069 32,411
13,563 34,086
13,092 35,643
12,659 37,116
12,252 38,487
11,870 39,773
T20
The total power “P” and the total torque
“M” transmitted by the belt, are calcula-
ted with the following formulas:
P [Kw] = P
spez
•
z
e
•
z
k
•
b / 1000
M [Nm] = M
spez
•
z
e
•
z
k
•
b / 100
Z
e
=
P
= power in Kw
M
= torque in Nm
P
spez
= specific power
M
spez
= specific torque
z
e
= number of teeth in mesh of
the small pulley
z
emax
= 12
z
k
= number of teeth of the small
pulley
b
= belt width in cm
A
= centre distance [mm]
( )
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⋅π⋅
− ⋅
⋅
⋅
A 2
z z t
arccos
180
Z
k
g
k
ELA-flex SD
™
67