2 Basics of drive design .1 Gear Drive Geometry, Important Parameters and Formulas
3.6 technical Data Sheet
3.6 Technical data sheet
Power drives can be designed with the information in the technical Data Sheets of the product groups optibelt ALPHA tOrQuE, ALPHA POWEr and ALPHA FLEX timing belts, further data in this technical manual and the current Optibelt product range list. In Subchapter 3.5, this is done generally and uses an optibelt ALPHA tOrQuE timing belt with the AT10 profile of the ST standard design.
the relevant up-to-date technical Data Sheets are available on the website www.optibelt.com. there, you can download the optibelt CAP software for drive design of power drives free of charge and obtain further current information about services and products.
We would be pleased to offer advice about technical characteristics and drive design as well as special requirements.Further information can be found in OPTIBELT documentation. © OPTIBELT GmbH 09/2015.Subject to technical modification and change, errors and omissions excepted.
Timing belt pulleys, inside and outside idlers No. of teeth: zmin = 15 Pitch-Ø : dw min = 47.75 mm Plane, cylindrical idlers, Ø Inside idler: dmin = 42 mm
Length tolerance: See table Width tolerance, b ≤ 50 mm: ± 0.5 mm Thickness tolerance: ± 0.3 mm
Specific nominal power transmittable per tooth Speed,
20 0.025 1300 1.002 3800 1.952
402 0.048 1400 1.056 4000 2.003
60 0.072 1500 1.108 4500 2.119
803 0.094 16007 1.158 5000 2.220
100 0.116 1700 1.207 5500 2.308
2004 0.220 1800 1.253 6000 2.383
300 0.314 1900 1.299 6500 2.447
4005 0.401 2000 1.343 7000 2.500
500 0.482 2200 1.427 7500 2.545
600 0.559 2400 1.506 8000 2.580
700 0.631 2600 1.581 8500 2.606
8006 0.700 2800 1.652 9000 2.625
900 0.766 3000 1.718 9500 2.636
1000 0.828 32008 1.782 10000 2.640 1100 0.889 3400 1.842 vmax = 60 m/s
1 FN spez [N/mm] I 7.500 2 7.273 3 7.073 4 6.590 5 6.012 6 5.250 7 4.343 8 3.341
Technical Data Sheet
optibelt ALPHA TORQUE AT10 - ST
PU Timing Belt, Cast Polyurethane, Endless
Length tolerances, shown as centre distance tolerances Length transmittable per tooth [W/mm]
zk Number of teeth, small pulley zeB Number of teeth in mesh, small
pulley, limited to zeB max
zeB max 12, maximum allowable no.of teeth b Belt width [mm]
Nominal power PN
PN = PN spez· zk · zeB· b / 103 [kW]
Nominal torque MN
MN = PN · 9.55 · 103 / nk [Nm]
Nominal tensile force FN
FN = FN spez · zeB · b [N]
nk Speed, small pulley [1/min]
FN spez Specific nominal tensile force transmittable per tooth [N/mm]
t Tooth pitch [mm]
Cord tensile forces, belt weight
Belt width1 b [mm] 10 12 16 20 25 32 50 75 100
Breaking strength FBr[N] 4760 5700 8560 10500 14300 18100 29500 45600 62000 Allowabletensileforce2Fzul[N] 1190 1425 2140 2625 3575 4525 7375 11400 15500 Weight per metre [kg/m] 0.065 0.078 0.104 0.130 0.163 0.208 0.325 0.488 0.650
1 Other and intermediate widths possible 2 Allowable tensile force Fzul equivalent to 25% breaking strength FBr of the cords I
5
Construction
Polyurethane: Thermoset, 84 +/-4 Shore A, transparent Tension cord: Steel, Ø 0.9 mm
4 linear drives
4.1 general
4.1 general
Chapters 1.1 to 1.3 contain, for example, the applications, characteristics, production processes and structures of all product groups of the polyure-thane timing belts. these are summarised in this chapter for linear drives and the pertaining product group optibelt ALPHA LInEAr.
the product group optibelt ALPHA LInEAr includes an elastomer of 92 Shore A hard polyurethane in its standard version and is consequently able to reliably transmit the power without an additional fabric layer on the tooth side – see Figure 4.1.1. The optibelt ALPHA LINEAR timing belt can optionally be provided with a thin fabric on the tooth side for friction or noise minimisation, see Figure 4.1.2. Fabric on the top surface is likewise possible. Compared to the open-ended timing belts of rubber with a glass fi bre tension cord, the optibelt ALPHA LINEAR timing belt is basical-ly more stable in shape and more accurate in positioning.
The basic features or benefi ts of the timing belts of polyurethane are:
• High-strength steel or aramid tension cord
• Low tooth deformation
• High abrasive strength
• Large lengths can be implemented
• High ozone and UV resistance
• Good to very good resistance to oils, greases and a large number of aggressive chemicals
• Optional PU with EU Declaration of Compliance / FDA, see www.optibelt.com
the product group optibelt ALPHA LInEAr extends the application spec-trum to drives with very long drive centre distances:
• Standard length on rolls for pitch smaller than 14 mm: 100 m
• Standard length on rolls for pitch from 14 mm: 50 m
• Clearly larger lengths than standard length possible on reel, e.g. 300 m in 8M profi le and width 10 mm
Simple open-ended optibelt ALPHA LInEAr timing belts are used in linear drives with a high positioning and repetition accuracy.
The major single infl uencing factors for the total repetition and positioning accuracy are:
• Tension cord elongation
• Tooth deformation
• Tooth gap clearance
Further infl uencing factors are e.g. the length variations of the belt, the precision of shafts and pulleys, the overall rigidity and the bearing clear-ances of the linear unit.
Figure 4.1.2: optibelt ALPHA LINEAR with polyamide fabric PAZ on the tooth side
Figure 4.1.1: optibelt ALPHA LINEAR
Table 4.1.1: Product group and applications
4 linear drives
4.1 general
optibelt alPha linear extruded, open-ended Length of the roll 50 m, 100 m Intermediate lengths in indexing steps Imperial profi le
5m, 8m, S8m, 14m, 14mL, 14mLP F2, F2.5, F3, FL3
Standard colour white
Standard hardness 92 Shore A Standard tension
cord 1 steel
aramid PA tooth side, PAz + optional PA top surface, PAr + optional Special hardness 65, 85, 98 Shore A Special colour e.g. black, blue, on request
ac-cording to rAL no.
minimum quantity for special hard-ness, colour
from 200 metres with max.
production width Special tension cord 1
see Chapter 1.6 highly fl exible steel stainless steel Without sleeve nose t10, optional Pu (FDA):
Hardness, colour 85 Shore A, blue, optionally transparent the use of high-strength steel or aramid tension cords
with a low elasticity in combination with bending fl exi-bility keeps the major portion of the overall deviation low.
Timing belts with the ATL profi le for AT pulleys with standard tooth system are equipped with tension cords that are especially reinforced for the linear technology and a negative length tolerance. this combination ena-bles an even more rigid timing belt system with an above-average positioning accuracy compared to tim-ing belts in technical standard design.
the abrasion-resistant polyurethane with an already high standard hardness of 92 Shore A features a high stability in shape that decreases with a lower hardness and increases with a higher hardness. If applied as a tooth bar, the special hardness 98 Shore A can be used, which is not suitable for the circulation of the timing belt pulleys.
timing belt pulleys with reduced tooth gaps for a limited tooth gap clearance or even tooth gaps which correspond in size and contour to the belt tooth, also called zero gap, increase the accuracy even further, if required; see also Subchapter 4.6.
the open-ended polyurethane timing belts of the product group ALPHA LInEAr can be provided on the tooth side and/or on the top surface during production with a polyamide fabric to minimise the noise develop-ment and reduce the force losses of the supporting span side in the case of long drive centre distances.
the features of the PA fabric are described in Subchap-ter 6.1.
For the linear drives, basically the AT and HTD profi les are used which exhibit a higher shape rigidity than the smaller trapezoidal T profi les or imperial profi le.
Open-ended, extruded polyurethane timing belts have the following features:
• High tensile forces with low elongation
• High positioning accuracy
• S+Z tensile reinforcements in parallel to the edges
• Design e.g. with highly fl exible and/or reinforced tension cords possible
• Base belt without sleeve nose depending on profi le, e.g. profi le T10
• PAZ/PAR, polyamide fabric on tooth system and/or belt top surface possible
• Roll length 50 m or 100 m, intermediate lengths available on request
Table 4.1.2: Product groups, lengths, profi les and features
Figure 4.1.3: Extruded and moulded polyurethane with tensile reinforcements parallel to the edges
1 Aramid and special cords for each profi le on request