OPTIBELT. TECHNICAL MANUAL optibelt DELTA CHAIN Carbon

Transcription

1 OPTIBELT TECHNICAL MANUAL optibelt DELTA CHAIN Carbon

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3 OPTIBELT TECHNICAL MANUAL optibelt DELTA CHAIN Carbon The optibelt DELTA CHAIN Carbon sets new standards in the market for high performance timing belts. Endless optibelt DELTA CHAIN Carbon high performance timing belts together with the associated ZRS DC timing belt pulleys enable slip-free synchronous power transmission of up to several hundred kilowatts. Up to 100 % higher power transmission is possible compared to high performance rubber timing belts such as optibelt OMEGA HP. The particular focus here is on drives with very high torques. In general, the overall width can be considerably reduced for power drives with small and medium centre distances. The innovative combination of materials comprising an extremely resistant polyurethane compound, an abrasion-resistant and specially treated polyamide fabric, as well as a carbon fibre cord, provides the optibelt DELTA CHAIN Carbon with unmatched strength and resistance to a wide range of chemicals, oils and fluids. This means that the optibelt DELTA CHAIN Carbon is suitable for a wide variety of applications, including uses which were previously reserved for roller chains, for example. All relevant information as well as the methods to calculate drives with optibelt DELTA CHAIN Carbon high performance timing belts are included in this manual. They are supplemented by the Optibelt product ranges and price lists for belts and pulleys, technical data sheets, the optibelt CAP software for drive design, CAD drawings of optibelt ZRS DC toothed pulleys and additional Optibelt documentation, which can be found in their current version on the Optibelt website. If you have any further questions, please take advantage of the free service provided by our application engineers. ARNTZ OPTIBELT GROUP, GERMANY 1

4 Optibelt Europa Optibelt Afrika Optibelt Amerika Optibelt-Partner sind in nahezu allen Ländern der Welt zu finden! Optibelt GmbH Optibelt Österreich GmbH Optibelt Nederland B.V. Optibelt Polska Sp. z o.o. Optibelt GmbH Optibelt Hungary Kft Optibelt (Canada) Inc. Optibelt de México Optibelt do Brasil Ltd Optibelt Indonesien Optibelt Asia Pacific Pte. Ltd. Optibelt Power Transmission (Shanghai) Co., Ltd. 2 ARNTZ OPTIBELT GROUP, GERMANY

5 Optibelt Asien Optibelt Australien Optibelt AG Optibelt (UK) Ltd. Optibelt France SAS Optibelt AG Optibelt España, S.A. Optibelt Güc Aktarma Ekipmanlari San. Ve Tic Ltd. Sti. OOO Optibelt Power Transmission Optibelt Finland Oy Optibelt Skandinaviska AB Optibelt Corporation a. Optibelt Colombia S. A. S. Optibelt Power Transmission India Pvt. Ltd. Optibelt Australia Pty Ltd. Optibelt TRANZ Corp. Optibelt Philippinen Optibelt Thailand Optibelt Vietnam ARNTZ OPTIBELT GROUP, GERMANY 3

6 TABLE OF CONTENTS Introduction...1 Sales Organisation of the Arntz Optibelt Group PRODUCT DESCRIPTION 1.1 Structure Features Dimensions and Tolerances TIMING BELT PRODUCT RANGE 2.1 The optibelt DELTA CHAIN Carbon 8MDC The optibelt DELTA CHAIN Carbon 14MDC DRIVE DESIGN 3.1 Formula Symbols Pre-Selection of the Profiles Drive Service Factors Additional Factors and Minimum Allowances Formulae and Calculation Example Belt Tension Adjustment by Frequency Measurement ARNTZ OPTIBELT GROUP, GERMANY

7 TABLE OF CONTENTS 4 POWER RATINGS 4.1 The optibelt DELTA CHAIN Carbon 8MDC The optibelt DELTA CHAIN Carbon 14MDC DESIGN HINTS 5.1 Timing Belt Pulleys / Tension Idlers Installation and Maintenance Problems Causes Remedies TOOTHED PULLEYS 6.1 Minimum Pulley Diameter and Designs Dimensions and Tolerances Taper Bush Range Toothed Pulley Range GENERAL INFORMATION 7.1 Overview of Standards Data Sheet for Calculation ARNTZ OPTIBELT GROUP, GERMANY 5

8 1 PRODUCT DESCRIPTION 1.1 STRUCTURE SUITABLE FOR BACK BEND IDLERS, SMOOTH TOP SURFACE REDUCES RUNNING NOISE OF IDLERS SPECIAL FABRIC FOR MINIMUM WEAR AND REDUCED RUNNING NOISE CARBON CORD WITH UNBEATABLE LONG-TERM STABILITY AND AN EXCEPTIONAL BREAK-PROOF TENSION CORD IN COMPARATIVE TESTS OPTIMISED TOOTH FORM FOR HIGH-STRENGTH POLYURETHANE COMPOUND TEETH The teeth and also the top layer are made of high-strength cast polyurethane or thermoset and an extremely wear-resistant fabric. Both features give the teeth outstanding shear strength. TOOTH-SIDE FABRIC The shear strength of the teeth is enhanced by a strong, coated and well-bonded fabric. Friction between the belt and the pulley is also reduced. This reduces the degree to which the friction partners heat up and minimises the running noise. TOOTH PROFILE The curved tooth profile of the optibelt DELTA CHAIN Carbon timing belt ensures that it perfectly meshes and engages with the precisely fitting grooves on the matching optibelt ZRS DC pulleys. This tooth profile is not compatible with Omega or HTD, RPP and STD profiles. Consequently, the use of optibelt DELTA CHAIN Carbon timing belts is only recommended for optibelt ZRS DC pulleys or CTD or PC pulleys with the same profile. These and all other significant curved profiles, particularly including those of the pulleys referred to above, are standardised in ISO TENSION CORD In contrast to rubber and polyurethane timing belts e.g. the optibelt ALPHA product groups, a tension cord made of carbon fibres is used. This stands out particularly with its ability to transmit extremely high forces. Carbon cord achieves unmatched length stability and outstanding breakage resistance in comparison to all other tension cords such as those made of glass, steel or aramid. optibelt DELTA CHAIN Carbon timing belts must not be bent otherwise the carbon tension cord will be damaged. TOP SURFACE The smooth top surface of the belt consists of an abrasion-resistant, thin, and thus bendable polyurethane compound. Due to the smooth top surface as opposed to a grooved structure, a back bend idler can be used without any significant increase in the noise level. 6 ARNTZ OPTIBELT GROUP, GERMANY

9 1 PRODUCT DESCRIPTION 1.2 FEATURES POWER TRANSMISSION Up to 100 % higher power transmission is possible compared to high performance rubber timing belts such as the optibelt OMEGA HP. The particular focus here is on drives with very high torques. In general, the overall width can be considerably reduced for power drives with small and medium centre distances. RESISTANCE TO CHEMICALS Due to the materials used, especially the elastomer polyurethane used in this case, the optibelt DELTA CHAIN Carbon exhibits good to very good resistance to oils, greases and a large number of aggressive chemicals when compared to rubber. Verification of the selected drive in tests is generally recommended. Simple swelling tests should be performed in advance. TEMPERATURE RESISTANCE The timing belt withstands temperatures of approx. 30 C to +80 C. Temperatures exceeding this level may result in premature failure of the belt. EFFICIENCY Timing belt drives operate synchronously with positive engagement power transmission, i.e. without speed loss, in contrast to drives with frictional power transmission. Despite the high-strength polyurethane, the belt is still flexible in the bending direction, and the specially developed tooth fabric provides almost frictionless engagement with the teeth, resulting in up to 98 % efficiency. NOISE EMISSIONS The optimised tooth shape and the coated, tooth-facing fabric minimise friction and the noise that occurs when the tooth engages with the pulley. Moreover, by reducing the belt width by up to 50 % compared to high performance rubber timing belts, the noise component caused by air displacement is also considerably reduced. This means overall that the relatively hard optibelt DELTA CHAIN Carbon is able to match, or even improve on, the noise level of rubber timing belts, especially compared to much wider standard rubber or polyurethane timing belts. Figure 1.2.1: Test bench Figure 1.2.2: Reduced width ARNTZ OPTIBELT GROUP, GERMANY 7

10 1 PRODUCT DESCRIPTION 1.3 DIMENSIONS AND TOLERANCES Table 1.3.1: Nominal dimensions and weights per metre Profile Tooth pitch Overall height Tooth height Metre weight per mm width t t h h t [kg/(m*mm)] 8MDC MDC h t h Figure 1.3.1: Profile DC LENGTH TOLERANCES The length tolerances indicated in Table refer to the centre distance. The measuring arrangement is shown in Figure Table 1.3.2: Length Tolerances Timing belt length L w Length tolerance a LTol > 786 > 1022 > 1274 > 1526 > 1784 > 2040 > 2288 > 2544 > 2800 > 3052 > 3312 < 760 < 1016 < 1272 < 1520 < 1778 < 2032 < 2282 < 2536 < 2792 < 3048 < 3304 < 3566* ± 0.30 ± 0.33 ± 0.36 ± 0.41 ± 0.43 ± 0.46 ± 0.49 ± 0.52 ± 0.54 ± 0.56 ± 0.58 ± 0.60 * For longer lengths, 0.03 mm have to be added for each increment of 250 mm. Measuring force Q [N] Figure 1.3.2: Arrangement to measure the belt length a Table 1.3.3: Measuring forces to determine the belt length Width Profile Measuring force [N] 8MDC MDC ARNTZ OPTIBELT GROUP, GERMANY

11 1 PRODUCT DESCRIPTION 1.3 DIMENSIONS AND TOLERANCES Table 1.3.4: Width tolerance Profile Width Pitch length L w 840 mm Permissible tolerance of belt width Pitch length L w > 840 mm 1680 mm Pitch length L w > 1680 mm 8MDC < 12 < 21 < 36 < 62 ± 0.4 ± 0.8 ± 0.8 ± 0.8 ± / / / / /- 1.6 ± / / /- 1.2 ± MDC < 20 < 37 < 68 < 90 < 125 ± 0.8 ± 0.8 ± /- 1.6 ± 1.6 ± 2.4 ± / /- 1.2 ± / / / / / /- 2.0 ± /- 3.2 STANDARDIZATION optibelt DELTA CHAIN Carbon timing belts and optibelt ZRS DC pulleys are standardized in ISO ARNTZ OPTIBELT GROUP, GERMANY 9

12 h t h 2 TIMING BELT PRODUCT RANGE 2.1 optibelt DELTA CHAIN Carbon 8MDC t Profile 8MDC t 8.0 h 5.9 h t 3.4 optibelt DELTA CHAIN Carbon 8MDC Profile, length Pitch length L w Number of teeth Profile, length Pitch length L w Number of teeth 8MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , MDC , Please also refer to the current product range or inquire about other dimensions. Standard widths: 12 mm, 21 mm, 36 mm, 62 mm Intermediate widths on request Example order: optibelt DELTA CHAIN Carbon MDC = pitch length L w 8MDC = profile 21 = width 10 ARNTZ OPTIBELT GROUP, GERMANY

13 h t h 2 TIMING BELT PRODUCT RANGE 2.2 optibelt DELTA CHAIN Carbon 14MDC t Profile 14MDC t 14.0 h 10.2 h t 6.0 optibelt DELTA CHAIN Carbon 14MDC Profile, length Pitch length L w Number of teeth Profile, length Pitch length L w Number of teeth PRODUCT RANGE OF optibelt DELTA CHAIN Carbon HIGH PERFORMANCE TIMING BELTS PROFILE 14MDC UNDER DEVELOPMENT Please also refer to the current product range or inquire about other dimensions. Standard widths: 20 mm, 37 mm, 68 mm, 90 mm, 125 mm Intermediate widths on request Example order: optibelt DELTA CHAIN Carbon MDC = pitch length L w 14MDC = profile 37 = width ARNTZ OPTIBELT GROUP, GERMANY 11

14 3 DRIVE DESIGN 3.1 FORMULA SYMBOLS Table 3.1.1: Formula symbols Formula symbols Explanation Unit a Drive centre distance a nom Drive centre distance, calculated with a standard belt length Base drive service factor c 0 c 1 c 2 c 3 c 6 c 7 Tooth meshing factor Total drive service factor Speed ratio correction factor Fatigue allowance Length factor d a Outside diameter of timing belt pulley d w Pitch diameter of timing belt pulley d wg d wk Pitch diameter of large timing belt pulley Pitch diameter of small timing belt pulley d w1 Pitch diameter of driving pulley d w2 Pitch diameter of driven pulley E a Belt deflection for a given span length F Test force [N] f Frequency [Hz] i Speed ratio L Span length L wst Standard pitch length of the timing belt L wth Calculated pitch length of the timing belt n 1 Speed of the driving pulley [min -1 ] Formula symbols Explanation Unit n 2 Speed of the driven timing belt pulley [min -1 ] P Power to be transmitted from timing belt drive [kw] P B Design power [kw] P N Rated power [kw] P Ü Power transmitted from a standard belt width [P N c 1 c 7 ] [kw] F a Minimum static shaft loading [N] F n perm Maximum permitted circumferential force [N] F n3 Circumferential force to be effectively transmitted [N] F n Circumferential force to be effectively [N] transmitted incl. actual centrifugal force t Tooth pitch v Belt speed (velocity) [m/s] x z e z g z k z R z 1 z 2 Minimum allowance of the drive centre distance a nom for installation of the timing belt Number of meshed teeth of the small driving pulley Number of teeth of the large driving pulley Number of teeth of the small driving pulley Number of teeth of the timing belt Number of teeth of the driving pulley Number of teeth of the driven pulley Figure 3.1.1: Example of a drive geometry: Belts and pulleys 12 ARNTZ OPTIBELT GROUP, GERMANY

15 3 DRIVE DESIGN 3.2 PRE-SELECTION OF THE PROFILES Graph 3.2.1: Pre-selection of profiles 8MDC and 14MDC See also optibelt CAP drive calculation, software at Speed of small timing belt pulley n k [min -1 ] optibelt DELTA CHAIN Carbon 8MDC optibelt DELTA CHAIN Carbon 14MDC Speed of small timing belt pulley n k [min -1 ] Design power P B = P c 2 [kw] ARNTZ OPTIBELT GROUP, GERMANY 13

16 3 DRIVE DESIGN 3.3 DRIVE SERVICE FACTORS TOTAL DRIVE SERVICE FACTOR c 2 The total drive service factor c 2 is composed of the base drive service factor c 0 and two further allowances c 3 and c 6. c 2 = c 0 + c 3 + c 6 [ ] c 2 M A M N, c 2 M Br M N [ ] at drive with M A [Nm], M N [Nm] and M Br [Nm] c 2 M Br M N i [ ] at driven side with M N [Nm], M Br [Nm] and i [ ] The total drive service factor c 2 should also consider a high starting load M A and a high braking load M Br at the drive or a high braking load at the driven side in proportion to the rated load M N of the driving machine. With frequent switching operations and high starting or braking loads, which thus become the main load, while the power transmission itself recedes into the background, an additional safety allowance must be added to the maximum determined quotient. Table 3.3.1: Base drive service factor c 0 c 0 Uniform run Electric motor Fast-moving turbine Piston machine with high number of cylinders Irregular operation Hydraulic motor Slow-moving turbine Piston machine with low number of cylinders Load type and examples of driving machines Type of base load and examples of a driven machine Light drives, joint-free and uniform running Measuring instruments Film cameras Office equipment Belt conveyors (light goods) Medium drives, temporary operation with small to medium impact loading Mixing machines Food processors Printing machines Textile machines Packaging machines Belt conveyors (heavy goods) Heavy drives, operation with medium to strong temporary impact load Machine tools Wood processing machines Eccentric drives Conveying systems (heavy goods) Very heavy drives, operation with strong permanent impact load Mills Calenders Extruders Piston pumps and compressors Lifting gear Base drive service factor c 0 for daily operating time up to 16 h above 16 h up to 16 h above 16 h ARNTZ OPTIBELT GROUP, GERMANY

17 3 DRIVE DESIGN 3.4 ADDITIONAL FACTORS AND MINIMUM ALLOWANCES BASE DRIVE SERVICE FACTOR c 0 The base drive service factor c 0 takes into account the daily operating time and the type of driver and driven units. As it is not possible to summarise any thinkable combination of driver, driven unit and operating conditions in one table, the base drive service factors are to be considered as guide values. The assignment of the driven unit depends on the type of load that is present in each case. For slowly operating drives with a speed of 100 min -1, a base drive service factor of at least 2 is recommended. SPEED RATIO CORRECTION FACTOR c 3 For the speed step-up ratios, the value that corresponds to the speed ratio is added to the base drive service factor c 0. Table 3.4.4: Tooth meshing factor c 1 Number of meshed teeth Tooth meshing factor c 1 Table 3.4.1: Speed ratio correction factor Speed ratio i Speed ratio correction factor c < < < < Minimum allowance x for tensioning timing belts x = a nom Table 3.4.2: Fatigue allowance c 6 Drive conditions Use of tension or idler pulleys Operating time h Only rare or occasional operation Fatigue allowance c Table 3.4.5: Minimum allowance y for installation of timing belt pulleys without flange Drive centre distances 1000 > > > > Minimum allowance y Table 3.4.3: Length factor c 7 Profile 8MDC Profile 14MDC Pitch length c 7 Pitch length c > > > > > > > > > > > > > Table 3.4.6: Minimum allowance y for installation of timing belt pulleys with flanges Profile 8MDC 14MDC Flange on one Flange on both timing belt pulley timing belt pulleys ARNTZ OPTIBELT GROUP, GERMANY 15

18 3 DRIVE DESIGN 3.5 FORMULAE AND CALCULATION EXAMPLE PRIME MOVER Electric motor 50 Hz star-delta connection P = 11 kw n 1 = 1450 min -1 DRIVE CONDITIONS Operational hours per day: 12 hours Number of starts: Twice per day Environmental influences: Ambient temperature, no influence of oil, water and dust Drive centre distance: 400 mm to 450 mm Maximum pulley diameter: 200 mm DRIVEN MACHINE Paper machine n 2 = 920 min -1 ± 2 % Type of load: Constant FORMULAS TOTAL DRIVE SERVICE FACTOR c 2 = c 0 + c 3 + c 6 c 0 from Table c 3 from Table c 6 from Table CALCULATION EXAMPLE c 2 = = 1.6 c 0 = 1.6 c 3 = 0 c 6 = 0 DESIGN POWER P B = P c 2 P B = = 17.6 kw TIMING BELT PROFILE from Graph optibelt DELTA CHAIN Carbon Profile 8MDC RECALCULATION OF SPEED n i = 1 z = 2 = d w i = n 2 z 1 d w1 920 = NUMBER OF TEETH ON THE TIMING BELT PULLEYS z 1, d w1 Standard timing belt pulleys, see 6.4 z 2 = z 1 i Please observe minimum diameter! Minimum number of teeth, see Table z 1 = 36 d w1 = mm z 2 = = z 2 = 56 d w2 = mm Requirement z 22 minimum number of teeth for profile 8MDC met RECALCULATION OF SPEED i = z 2 z 1 n 2 = n 1 i i = 56 = n 2 = = 932 min Required: 920 min -1 ± 2 % met RECOMMENDED DRIVE CENTRE DISTANCE Recommendation a > 0.5 (d w1 + d w2 ) + 15 mm a > 0.5 ( ) + 15 mm = mm a < 2.0 (d w1 + d w2 ) a < 2.0 ( ) a = 425 mm selected provisionally = mm See also optibelt CAP drive calculation, software at 16 ARNTZ OPTIBELT GROUP, GERMANY

19 3 DRIVE DESIGN 3.5 FORMULAE AND CALCULATION EXAMPLE FORMULAS PITCH LENGTH π L wth 2a + (d wg + d wk ) + (d wg d wk ) a L wst see timing belt range in Chapter 2 CALCULATION EXAMPLE π ( )2 L wth ( ) L wth mm (selected from Subchapter 2.1) L wst = 1200 mm NOMINAL DRIVE CENTRE DISTANCE a nom = K + K 2 (d wg d wk ) 2 8 L wst π K = (d wg + d wk ) 4 8 ( a nom = )2 8 a nom = mm 1200 π K = ( ) = 208 mm 4 8 MINIMUM ALLOWANCE FOR TENSIONING x = a nom x 1.66 mm MINIMUM ALLOWANCE FOR INSTALLATION y = from Table NUMBER OF MESHED TEETH ON THE SMALL PULLEY z e = z k 6 3 ( d wg d wk a nom ) Round down value y = 33 mm Flange on both timing belt pulleys ( 415 ) 36 z e = 3 = z e = 17 BELT LENGTH CORRECTION FACTOR c 7 from Table c 7 = 1.0 TOOTH MESHING FACTOR c 1 from Table c 1 = 1.0 BELT WIDTH OVER RATED POWER Required: P Ü P B P Ü = transferable rated power of a standard belt width P Ü = P N c 1 c 7 P N (profile, b) = P N width factor (see Chapter 4) kw > 17.6 kw Requirement met P Ü = = kw P N (8MDC, b = 21 mm) = = kw Result: 1 pc. optibelt DELTA CHAIN Carbon timing belt MDC 21 1 pc. optibelt ZRS DC timing belt pulley 36 8MDC 21 1 pc. optibelt ZRS DC timing belt pulley 56 8MDC 21 ARNTZ OPTIBELT GROUP, GERMANY 17

20 3 DRIVE DESIGN 3.6 BELT TENSION ADJUSTMENT BY FREQUENCY MEASUREMENT TENSION FOR optibelt DELTA CHAIN Carbon TIMING BELT The correct level of belt tension is of crucial importance for trouble-free transmission of power, and for achieving an acceptable belt service life. Often, tension which is either too high or too low results in early timing belt failure. A belt which is over-tensioned sometimes causes bearing failure in the driver or driven unit. Adjustment of the specified static span force, e.g. using the thumbprint method, is not a suitable means of tensioning drives correctly in order to fully exploit them economically. Instead of this, adjustment of the static span force through frequency measurement, e.g. using instruments from the optibelt TT series, is recommended. The default value for the frequency measurement can be determined using the following formulas. FORMULA SYMBOLS ß [ ] Arc of contact f [Hz] Frequency m k [kg/m] Weight per metre L Span length n k [1/min] Speed of small pulley P N [kw] Rated power F a F u t F T v z k [N] Static drive centre force [N] Circumferential force Pitch [N] Static span force [m/s] Circumferential speed Number of teeth of small pulley f F T f DRIVE CENTRE FORCE, STATIC SPAN FORCE, STATIC CIRCUMFERENTIAL FORCE FREQUENCY F a = P N sin β 2 t z k n k F T = F a 2 sin β 2 F U = P N 1000 V f = F T m k L 2 18 ARNTZ OPTIBELT GROUP, GERMANY

21 4 POWER RATINGS 4.1 optibelt DELTA CHAIN Carbon profile 8MDC Table 4.1.1: Rated power for profile 8MDC width 12 mm Rated power P N [kw] Speed of small timing belt pulley n k [min -1 ] Number of teeth on the small pulley z k Pitch diameter of the small timing belt pulley d wk Further power values for other belt widths can be derived from multiplication with the width correction factors. Permitted rated circumferential force F N perm with n k 100 min -1 and z k 40 Width F N perm [N] Width correction factor Width Factor ARNTZ OPTIBELT GROUP, GERMANY 19

22 4 POWER RATINGS 4.2 optibelt DELTA CHAIN Carbon profile 14MDC Table 4.2.1: Rated power for profile 14MDC width 20 mm Rated power P N [kw] Speed of small timing belt pulley n k [min -1 ] Number of teeth on the small pulley z k Pitch diameter of the small timing belt pulley d wk POWER VALUES optibelt DELTA CHAIN Carbon PROFILE 14MDC UNDER DEVELOPMENT Further power values for other belt widths can be derived from multiplication with the width correction factors. Permitted rated circumferential force F N perm with n k 100 min -1 and z k 40 Width F N perm [N] Width correction factor Width Factor 20 ARNTZ OPTIBELT GROUP, GERMANY

23 5 DESIGN HINTS 5.1 TIMING BELT PULLEYS / TENSION IDLERS FLANGES To guide Optibelt timing belts, timing belt pulleys should be equipped with flanges on one or both sides. For drive centre distances a > 8 d w, the timing belt pulleys are to be equipped with flanges on both sides. We recommend the use of standard timing belt pulleys. If this is not possible for design reasons, corresponding special timing belt pulley designs can be used. Small pulley with flanges on both sides Flanges on alternate side Both pulleys with flanges on both sides MAXIMUM TIMING BELT WIDTH The maximum timing belt width should not be larger than the diameter of the smallest timing belt pulley present in the drive. TENSION IDLERS Idlers are toothed or flat faced pulleys that do not transmit power within a drive system. Because they create additional bending stresses within the belt, they should be used according to the following guidelines: Diameter of the idlers the smallest permitted pulley according to the profile Width of the idlers the timing belt pulleys present in the drive Always arrange idlers in the empty span Inside idlers: 40 teeth always use timing belt pulley, > 40 teeth flat faced pulley possible As outside idlers, flat faced pulleys are to be used in general, as they run on the top surface of the belt Flat faced pulleys must not be of spherical shape The idlers must be attached in such a way that as many teeth as possible are meshed The arc of contact at the idler must be kept as low as possible Minimum span width 2 belt width Figure 5.1.1: Arrangement of the inside tension idler Figure 5.1.2: Arrangement of the outside tension idler ARNTZ OPTIBELT GROUP, GERMANY 21

24 5 DESIGN HINTS 5.2 INSTALLATION AND MAINTENANCE SAFETY INFORMATION Geometrically correct designing and power rating of drives with Optibelt timing belts ensures high operating reliability and an optimum lifetime. Practice has shown that premature failure can very often be traced to faulty installation or maintenance. To prevent this, we recommend that you observe the following instructions: TIMING BELT PULLEYS The teeth must be manufactured according to standard and also be clean. ALIGNMENT Shafts and pulleys should be correctly aligned prior to belt installation. Maximum deviations of shaft parallelism: Belt width Angular misalignment 25 > > > 100 ± 1 ± 0.5 ± 0.25 ± 0.15 correct incorrect TIMING BELT SETS Timing belts which run in pairs or groups on one drive must always be ordered as a set. This guarantees that all belts originate from the same batch and are identical in length. INSTALLATION Prior to installation, the drive centre distance must be reduced to enable the timing belt to be fitted easily. If this is not possible, the timing belt must be installed together with one or both timing belt pulleys. Forcing belts over the pulley flanges must be avoided as the damage this causes to the high-quality low-stretch tension members is often not visible. If taper bushes are used, the studs used should be checked after an operating time of 0.5 to 1 hour with the aid of a torque spanner. TENSION The tension must correspond to the guidelines in Chapter 3.6. Further inspections after installation are not necessary. TENSION IDLERS Tension idlers are to be avoided. If this is not possible, refer to the recommendations in Subchapter 5.1 of this manual. MAINTENANCE Optibelt timing belts are maintenance-free if used under normal ambient conditions. If there is clearly visible wear on belts and/or pulleys, they should be replaced; see instructions in Subchapters 5.3 and ARNTZ OPTIBELT GROUP, GERMANY

25 5 DESIGN HINTS 5.3 PROBLEMS CAUSES REMEDIES Problem Cause Remedy Heavy wear on the loaded tooth faces of the belt Excessive wear at base of tooth on belt Belt undertensioned Incorrect pulley profile Pitch error Excessive belt tension Drive under-dimensioned Faulty timing belt pulleys Correct the tension Check profile and replace, if necessary Use wider belts with higher transmission power Reduce tension Enlarge timing belts or pulleys Replace timing belt pulleys Unusual wear on belt edges Improper drive centre parallelism Faulty flanges Change of drive centre distance Re-align the shafts Replace the flanges Reinforce bearing or housing Belt teeth shearing off Excessive lateral belt movement Detachment of flanges Overloading Too few teeth in mesh Ambient temperature above 80 C Improper drive centre parallelism Timing belt pulleys are not aligned Impact loading with too high belt tension Timing belt pulleys not in line Very high lateral pressure of the timing belt Incorrect flange installation Increase diameter of small pulley or select wider belt Use wider belts or larger pulleys For ambient temperature above 80 C re-design with optibelt OMEGA HP EPDM 40 C / +140 C Re-align the shafts Align the pulleys Reduce belt tension Re-align the timing belt pulleys Re-align the shafts Install flanges correctly Apparent belt stretch Incorrect storage Correct the belt tension, reinforce and secure bearing support Excessive operating noise Abnormal wear of timing belt pulleys Incorrect shaft alignment Belt tension too high Pulley diameter too small Overloading of timing belt Belt width too wide with high speed Unsuitable material Incorrect tooth meshing Insufficient surface hardness Re-align the shafts Reduce the tension Increase pulley diameter Increase belt width or tooth meshing Reduce belt width by selecting larger belt types Use stronger material Replace timing belt pulleys Use harder material or harden surface Cracks on belt top surface Softening of the belt top surface Ambient temperatures below 30 C Influence of incompatible media Re-design with optibelt OMEGA HP EPDM 40 C / +140 C Provide heating for drive unit Shield from the media or use a suitable belt quality ARNTZ OPTIBELT GROUP, GERMANY 23

26 6 TOOTHED PULLEYS 6.1 MINIMUM PULLEY DIAMETER AND DESIGNS Do not use less than the recommended minimum number of teeth for pulleys, see Table A pulley diameter that is smaller than the minimum pulley diameter may lead to a reduced operational reliability and an unsatisfactory operating time. Table 6.1.1: Minimum number of teeth and minimum diameter Profile Minimum number of teeth Minimum diameter 8MDC MDC OB type EB type ZB type OBN type EBN type ZBN type MATERIALS Steel, grey cast iron, aluminium; further materials on request For speeds > 30 m/s, do not use cast pulleys beyond this speed! BORES All timing belt pulleys are pilot bored. On request they can be finish bored according to DIN H7. EXPLANATION OF THE ABBREVIATIONS OB without flanges EB one flange ZB two flanges OBN without flanges, with hub EBN one flange, with hub ZBN two flanges, with hub 24 ARNTZ OPTIBELT GROUP, GERMANY

27 6 TOOTHED PULLEYS 6.2 DIMENSIONS AND TOLERANCES PERMISSIBLE DEVIATION OF THE TOOTH SPACINGS The permissible deviations in the tooth spacing between two consecutive teeth, and of the sum of deviations within a 90 arc, are indicated in the following table. These tolerances represent the spacing between the corresponding points on the right and left surfaces of consecutive teeth. Table 6.2.1: Permissible deviation of the tooth spacings Outside diameter d a > > > > > 500 Permissible deviation of the tooth spacing between two consecutive teeth Sum within a 90 arc Table 6.2.2: Permissible deviation of the outside diameter Table 6.2.3: Pulley width Profile Pulley width designation 8MDC MDC For belt width *b f = pulley width between the flanges Smallest pulley width with flanges b f * without flanges b NOTE The minimum width b for pulleys without flanges can be reduced, if the straight running of the drive can be adjusted. However, this must not be below the minimum width indicated for pulleys with flanges b f. Outside diameter d a > > > > > 500 Permissible deviation Table 6.2.4: Side wobble tolerance Outside diameter d a Maximum total variation > mm per 10 mm outside diameter > mm mm per mm outside diameter above mm The optibelt DELTA CHAIN Carbon high performance timing belts feature outstanding longitudinal stiffness due to the tension cord made of carbon fibres. Especially for drives with short drive centre distances or span lengths, and/or large belt widths, a reduction may be required in the permissible deviation specified for the outside diameter and the running tolerances. Tension force fluctuations and additional loads on bearings, shafts and the belt can be minimised in this way. Table 6.2.5: Run-out tolerance Outside diameter d a Maximum total variation > mm per 10 mm outside diameter, however not larger than the outside diameter tolerance ARNTZ OPTIBELT GROUP, GERMANY 25

28 6 TOOTHED PULLEYS 6.2 DIMENSIONS AND TOLERANCES Table 6.2.6: Static balancing Steel pulleys machined on all sides must not be balanced if the circumferential speed is less than 30 m/s. Grey cast iron pulleys for medium speeds should be statically balanced as follows: Profile Number of teeth Static balancing [N] 8MDC 14MDC 130 > > Timing belt pulleys that are used for a circumferential speed of more than 30 m/s must be dynamically balanced up to Nm. PARALLELISM The teeth should be parallel to the centre of the bore with a maximum deviation of mm per millimetre of width. CONICITY The conicity must not be higher than mm per millimetre of head width and must not exceed the permissible outside diameter tolerance. 26 ARNTZ OPTIBELT GROUP, GERMANY

29 6 TOOTHED PULLEYS 6.3 TAPER BUSH RANGE optibelt TB taper bushes Taper bushes with metric bores and keyways to DIN 6885 part 1 Taper bush Material: EN-GJL-200 DIN EN Bore diameter d Hexagonal socket screws [in] 1 / 4 x 1 / 2 1 / 4 x 1 / 2 3 / 8 x 5 / 8 3 / 8 x 5 / 8 3 / 8 x 5 / 8 3 / 8 x 5 / 8 3 / 8 x 5 / 8 7 / 16 x 7 / 8 1 / 2 x 1 5 / 8 x 1 / 4 5 / 8 x 1 / 4 1 / 2 x 1 / 2 1 / 2 x 1 / 2 5 / 8 x 1 3 / 4 3 / 4 x 2 7 / 8 x 2 1 / 4 Torque [Nm] Bush length Weight at d 2 min [kg] Over 3525: Cap head screw with hexagonal socket This bore has shallow keyways. Shallow keyways for taper bushes Bore diameter d 2 Keyway width b Keyway depth t 2 Bore diameter d 2 Keyway width b Keyway depth t Taper bushes with inch bores and keyway to British Standard BS 46 part 1 Taper bush Material: EN-GJL-200 DIN EN Bore diameter d 2 [in] 3 /8* 3 /8* 1 /2 5 /8* 1 /2* 1 /2 1 /2 5 /8* 3 /4 1 /4 1 /4 1 /2 1 /2 1 3 /4* 2 1 /4* 3* 1 /2 1 /2 5 /8 3 /4 5 /8* 5 /8 5 /8 3 /4 7 /8 1 3 /8 1 3 /8 1 5 /8 1 5 /8 1 7 /8* 2 3 /8* 3 1 /4* 5 /8 5 /8 3 /4 7 /8 3 /4* 3 /4 3 /4 7 /8 1 1 /2 1 /2 1 3 /4 1 3 /4 2* 2 1 /2* 3 1 /2* 3 /4 3 /4 7 /8 1 7 /8* 7 /8 7 /8* 1 1 /8 1 5 /8 1 5 /8 1 7 /8 1 7 /8 2 1 /8* 2 3 /4* 3 3 /4* 7 /8 7 /8 1 1 /8 1* /8 1 /4 1 3 /4* 1 3 /4* /4* 2 7 /8* 4* /8 1 /4 1 /8 1 /8 1 /8 1 /4 1 3 /8 1 7 /8 1 7 /8 2 1 /8 2 1 /8 2 3 /8* 3* 4 1 /4* 1 /8 * 1 /4 1 /4 1 /4 1 /4 1 3 /8 1 / /4 2 1 /4 2 1 /2* 3 1 /4* 4 1 /2* 1 3 /8 1 3 /8 1 3 /8 1 /2 1 5 /8 2 1 /8* 2 1 /8* 2 3 /8 2 3 /8 2 5 /8* 3 3 /8* 4 3 /4* 1 /2 1 /2 1 5 /8 1 3 /4 2 1 /4 2 1 /4 2 1 /2 2 1 /2 2 3 /4* 3 1 /2* 5 * 1 5 /8 1 5 /8 * 1 3 /4 1 7 /8 2 3 /8 2 3 /8 2 5 /8 2 5 /8 2 7 /8* 3 3 /4* 1 7 / /2 2 1 /2 2 3 /4 2 3 /4 3* 4* /8 2 5 /8 2 5 /8* 2 7 /8 2 7 /8 3 1 /8* 4 1 /4 * 2 1 /4 2 3 /4 2 3 /4* /4* 4 1 /2 * 2 3 /8 2 7 /8 2 7 /8 3 1 /8 3 1 /8 3 3 /8* 2 1 / /4 3 1 /4 3 1 /2* 3 3 /8 3 3 /8 3 3 /4 * 3 1 /2 3 1 /2 4 * Hexagon socket screws [in] 1 / 4 x 1 / 2 1 / 4 x 1 / 2 3 / 8 x 5 / 8 3 / 8 x 5 / 8 3 / 8 x 5 / 8 3 / 8 x 5 / 8 3 / 8 x 5 / 8 7 / 16 x 7 / 8 1 / 2 x 1 5 / 8 x 1 / 4 5 / 8 x 1 / 4 1 / 2 x 1 / 2 1 / 2 x 1 / 2 5 / 8 x 1 3 / 4 3 / 4 x 2 7 / 8 x 2 1 / 4 Torque [Nm] Bush length Weight at d 2 min [kg] Over 3525: Cap head screw with hexagonal socket * Non-stock items This bore has a shallow keyway. ARNTZ OPTIBELT GROUP, GERMANY 27

30 6 TOOTHED PULLEYS 6.4 TOOTHED PULLEY RANGE optibelt ZRS DC toothed pulleys profile 8MDC for optibelt TB taper bushes b1 b1 B=b1 B=b1 B=b1 B=b1 B=b1 b1 b1 DB d w D Da dd D da DB dd da DB dd D da dd Di da Di dd D da Di dd D da Di dd D da Di dd D B=N Z B=N Z Z N Z Type 2F Type 2 Type 3F Type 6F Type 6 Type 7 Type 8 Type 9 Type 10 Designation Number of teeth Design Material d w Z N d a Z D B N 6 Z b 1 8MDC for belt width 12 8MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB F ST MDC 12 TB GG MDC 12 TB GG MDC 12 TB GG 229, MDC for belt width 21 8MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB F ST MDC 21 TB GG MDC 21 TB GG Z B N 7 Z N Z N 8 D Z D i Z B=N 9 N Z Taper bush Z B=N Z Weight of bush approx. [kg] 28 ARNTZ OPTIBELT GROUP, GERMANY

31 6 TOOTHED PULLEYS 6.4 TOOTHED PULLEY RANGE optibelt ZRS DC toothed pulleys profile 8MDC for optibelt TB taper bushes Designation Number of teeth Design Material d w d a D B 8MDC 21 TB GG b 1 B N D D i N Taper bush Weight of bush approx. [kg] 8MDC 21 TB GG MDC 21 TB GG MDC for belt width 36 8MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB F ST MDC 36 TB GG MDC 36 TB GG MDC 36 TB GG 229, MDC 36 TB GG MDC 36 TB GG MDC 36 TB GG MDC 36 TB GG MDC for belt width 62 8MDC 62 TB F ST MDC 62 TB F ST MDC 62 TB F ST MDC 62 TB F ST MDC 62 TB F ST MDC 62 TB F ST MDC 62 TB F ST MDC 62 TB GG MDC 62 TB GG MDC 62 TB GG 229, MDC 62 TB GG MDC 62 TB GG MDC 62 TB GG MDC 62 TB GG Taper bush Bore d 2 from... to GG: Grey cast iron ST: Steel We reserve the right to alter specifications without notice. Bore diameter d 2 see Subchapter 6.3. ARNTZ OPTIBELT GROUP, GERMANY 29

32 6 TOOTHED PULLEYS 6.4 TOOTHED PULLEY RANGE optibelt ZRS DC toothed pulleys profile 8MDC for cylindrical bore b1 d B d w D d a Z B=N Type 1F Designation Number of teeth Design Material d w d a D B 8MDC for belt width 12 b 1 B S D Weight approx. [kg] 8MDC F ST MDC for belt width 21 8MDC F ST MDC for belt width 36 8MDC F ST MDC for belt width 62 8MDC F ST MDC F ST MDC F ST MDC F ST MDC F ST ST: Steel We reserve the right to alter specifications without notice. 30 ARNTZ OPTIBELT GROUP, GERMANY

33 6 TOOTHED PULLEYS 6.4 TOOTHED PULLEY RANGE optibelt ZRS DC toothed pulleys profile 14MDC for optibelt TB taper bushes RANGE OF optibelt ZRS DC TOOTHED PULLEYS WITH PROFILE 14MDC UNDER DEVELOPMENT ARNTZ OPTIBELT GROUP, GERMANY 31

34 6 TOOTHED PULLEYS 6.4 TOOTHED PULLEY RANGE optibelt ZRS DC toothed pulleys with profile 14MDC for optibelt TB taper bushes RANGE OF optibelt ZRS DC TOOTHED PULLEYS WITH PROFILE 14MDC UNDER DEVELOPMENT 32 ARNTZ OPTIBELT GROUP, GERMANY

35 6 TOOTHED PULLEYS 6.4 TOOTHED PULLEY RANGE optibelt ZRS DC toothed pulleys with profile 14MDC for cylindrical bore RANGE OF optibelt ZRS DC TOOTHED PULLEYS WITH PROFILE 14MDC UNDER DEVELOPMENT ARNTZ OPTIBELT GROUP, GERMANY 33

36 7. GENERAL INFORMATION 7.1 OVERVIEW OF STANDARDS Federal Republic of Germany DIN 109 Sheet 1 Drive Elements; Circumferential Speeds DIN 109 Sheet 2 Drive Elements; Centre Distances for V-Belt Drives DIN 111 Pulleys for Flat Transmission Belts; Dimensions, Nominal Torques DIN 111 Sheet 2 Pulleys for Flat Transmission Belts; Classification for Electrical Machines DIN 2211 Sheet 1 Grooved Pulleys for Narrow V-Belts; Dimensions, Materials DIN 2211 Sheet 2 Grooved Pulleys for Narrow V-Belts; Inspections of Grooves DIN 2211 Sheet 3 Grooved Pulleys for Narrow V-Belts; Classification for Electrical Machines DIN 2215 Endless V-Belts, Classical Profiles; Minimum Datum Diameter of the Pulleys, Internal and Datum Belt Length DIN 2216 Open-Ended V-Belts; Dimensions DIN 2217 Sheet 1 V-Belt Pulleys for Classical Profiles; Dimensions, Materials DIN 2217 Sheet 2 V-Belt Pulleys for Classical Profiles; Inspections of Grooves DIN 2218 Endless V-Belts, Classic Profiles for Mechanical Engineering; Calculation of Drives, Performance Data DIN 7716 Rubber Products; Requirements for Storage, Cleaning and Maintenance DIN 7719 Part 1 Endless Wide V-Belts for Industrial Speed Changers; Belts and Groove Profiles for Corresponding Pulleys DIN 7719 Part 2 Endless Wide V-Belts for Industrial Speed Changers; Measurement of Centre Distance Variations DIN 7721 Part 1 Synchronous Belt Drives, Metric Pitch; Synchronous Belts DIN 7721 Part 2 Synchronous Belt Drives, Metric Pitch; Tooth Space Profile of Synchronous Pulleys DIN 7722 Endless Hexagonal Belts for Agricultural Machines and Groove Profiles of Corresponding Pulleys DlN 7753 Part 1 Endless Narrow V-Belts for Mechanical Engineering; Dimensions DIN 7753 Part 2 Endless Narrow V-Belts for Mechanical Engineering; Drive Calculation, Performance Data DIN 7753 Part 3 Endless Narrow V-Belts for the Automotive Industry; Dimensions DIN 7753 Part 4 Endless Narrow V-Belts for the Automotive Industry; Fatigue Testing DIN 7867 V-Ribbed Belts and Pulleys DIN/ISO 5290 Grooved Pulleys for Joined Narrow V-Belts; Groove Profiles 9J; 15J; 20J; 25J DIN Articles from Synthetics for Use in Underground Mines, Paragraph 5.4 V-Belts DIN EN Fire Hazard Testing ISO 2790 ISO 3410 ISO 4183 ISO 4184 ISO 5256 ISO 5287 ISO 5288 ISO 5289 ISO 5290 ISO 5291 ISO 5292 ISO 5295 ISO ISO ISO/DIS 8419 ISO 9010 ISO 9011 ISO 9563 ISO 9980 ISO 9981 ISO 9982 ISO ISO ISO ISO ISO Narrow V-Belt Drives for the Automotive Industry; Dimensions Endless Speed Changer Belts and Pulleys for Agricultural Machinery Grooved Pulleys for Classical V-Belts and Narrow V-Belts Classical V-Belts and Narrow V-Belts; Lengths Synchronous Belt Drives; Belt Tooth Pitch Code Part 1 MXL; XL; L; H; XH; XXH Part 2 MXL; XXL Metric Dimensions Narrow V-Belt Drives for the Automotive Industry; Fatigue Test Vocabulary from Timing Belt Drives Endless Double Profile V-Belts and Pulleys for Agricultural Machinery Grooved Pulleys for Joined Narrow V-Belts; Profiles: 9J; 15J; 20J; 25J Grooved Pulleys for Joined Classical V-Belts; Profiles: AJ; BJ; CJ; DJ Industrial V-Belt Drives; Calculations of the Performance Data and Centre Distance Timing Belts; Calculations of the Performance Data and Centre Distance "Inch Pitch" Dynamic Test to Determine Pitch Zone Location with V-Belts Dynamic Test to Determine Pitch Zone Location with V-Ribbed Belts Belt Drives; Joined Narrow V-Belts; Lengths in Effective System; 9N/J, 15N/J, 25N/J Synchronous Belt Drives Automotive Belts Synchronous Belt Drives Automotive Pulleys Antistatic Endless Synchronous Belts; Electrical Conductibility; Characteristics and Testing Method Belt Drives; V-Belt Pulleys, Geometric Inspection of Grooves Belt Drives Pulleys and V-Ribbed Belts for the Automotive Industry; PK Profile Belt Drives; Pulleys and V-Ribbed Belts for Industrial Requirements; Geometric Data PH, PJ, PK, PL, PM Belt Drives V-Ribbed Belts for the Automotive Industry, Fatigue Testing Synchronous Belt Drives Automotive Belts Physical Characteristics Synchronous Belt Drives Metric Pitch, Curvilinear Profile Systems G, H, R and S, Belts and Pulleys Synchronous Belt Drives Metric Pitch, Trapezoidal Profile Systems T and AT, Belts and Pulleys Synchronous belt drives -- Imperial pitch trapezoidal profile system -- Belts and pulleys ISO lnternational Organization for Standardization USA ISO 22 Widths of Flat Transmission Belts and Corresponding Pulleys ISO 63 Flat Belt Drives; Lengths ISO 99 Diameter of the Belt Pulleys for Flat Belts ISO 100 Bulging Height of the Belt Pulleys for Flat Belts ISO 155 Belt Pulleys; Limiting Values for Adjustment of Centre Distances ISO 254 Quality, Finish and Balance of Belt Pulleys ISO 255 Pulleys for Classical V-Belts and Narrow V-Belts; Geometric Testing of Grooves ISO 1081 Vocabulary from V-Belts, V-Ribbed Belts and Pulleys ISO 1604 Endless Speed Changer Belts and Pulleys for Mechanical Engineering ISO 1813 Electrical Conductivity of V-Belts, Kraftbands, V-Ribbed Belts, Wide V-Belts and Double Profile V-Belts ISO 2230 Please Consult DIN 7716 RMA/ARPM IP-20 Classical V-Belts and Sheaves (A; B; C; D; Cross Profiles) RMA/ARPM IP-21 Double (Hexagonal) Belts (AA; BB; CC; DD Cross Profiles) RMA/ARPM IP-22 Narrow Multiple V-Belts (3V; 5V; and 8V Cross Profiles) RMA/ARPM IP-23 Single V-Belts (2L; 3L; 4L; and 5L Cross Profiles) RMA/ARPM IP-24 Synchronous Belts (MXL; XL; L; H; XH; and XXH Belt Profiles) RMA/ARPM IP-25 Variable Speed V-Belts (12 Cross Profiles) RMA/ARPM IP-26 V-Ribbed Belts (PH; PJ; PK; PL; and PM Cross Profiles) RMA/ARPM IP-27 Curvilinear Toothed Synchronous Belts (8M 14M Pitches) ASAE S V-Belt Drives for Agricultural Machines SAE J636b V-Belts and Pulleys SAE J637 Automotive V-Belt Drives 34 ARNTZ OPTIBELT GROUP, GERMANY

37 7. GENERAL INFORMATION 7.2 DATA SHEET FOR CALCULATION / CHECKING OF TIMING BELT DRIVES.. Company: Street address/p.o. Box number: Town or city/post code: Contact person: Department: Phone: Date: Fax: For test For pilot production For series production New drive Existing drive Requirement Pieces/year Currently fitted with: pitch length profile width manufacturer PRIME MOVER Type (e.g. electric motor, diesel engine 3 cylinders) Size of the starting torque (e.g. MA = 1.8 MN) Type of start (e.g. star delta) Daily operating time hours Number of starts per hour per day Change in the direction of rotation per minute per hour Power: P normal kw P maximum kw or max. torque Nm at n 1 min -1 Speed of driver pulley n 1 min -1 Shaft layout: horizontal vertical inclined <) Maximum allowed static shaft loading S a max N Pitch diameter or number of teeth on the pulley: d w1 mm z 1 mm d w1 min mm z 1 min mm d w1 max mm z 1 max mm Maximum pulley face width mm DRIVEN MACHINE Type (e. g. lathe, compressor) Start: under load no load Type of load: steady pulsating shock Required power: P normal kw P maximal kw or max. torque Nm at n 2 min -1 Driven speed n 2 min -1 n 2 min min -1 n 2 max min -1 Maximum allowed shaft loading S a max N Pitch diameter or number of teeth on the pulley: d w2 mm z 2 mm d w2 min mm z 2 min mm d w2 max mm z 2 max mm Maximum pulley face width mm Speed ratio i i min i max Drive centre distance a mm a min mm a max mm Tension/guide idler pulley:_ inside idler in drive slack side outside idler in drive tigth side d w mm pulley moveable (e.g. spring loaded) d a mm flat pulley fixed Operating conditions Ambient temperature C/F minimum C/F max. Influence of oil (e.g. oil mist, drops) water (e.g. spray water) acid (type, concentration, temperature) dust (type) Special drives: e.g. for drives with inside or outside tensioning/idler pulleys, three or more multi-pulley drives or for drives with contra-rotating pulleys drawings are necessary. Please use the other side of this page for these drawings. ARNTZ OPTIBELT GROUP, GERMANY 35

38 NOTES 36 ARNTZ OPTIBELT GROUP, GERMANY

39 NOTES Owner of any and all copyrights and intellectual property rights as well as other rights of use and exploitation: Arntz Optibelt Group, Höxter, Germany. Any use, exploitation, reproduction, and any transfer to third parties by any means shall require the prior written approval of the Arntz Optibelt Group, Höxter, Germany. Any infringement will be prosecuted under the copyright act law. The products on offer provided by Optibelt are exclusively oriented towards specialised trade and not towards the consumer. Optibelt recommends that its products are to be exclusively used in accordance with the information provided in Optibelt documentation. The use of Optibelt products in aeroplanes or aviation systems, products and/or applications is not permitted. If in doubt, consult Optibelt before using any Optibelt products. Optibelt does not accept any liability for the use of Optibelt products in systems, products and/or applications for which they were not designed and/or manufactured. This is particularly, but not exclusively, the case if Optibelt products are to be used outside of any specific agreement with Optibelt in circumstances which are unusual or which present a particular risk to health, safety or the environment, or which require a more demanding use. Errors and omissions excepted. Optibelt does not accept any liability for the correctness or completeness of the information supplied by Optibelt or for the suitability of the information for use by the recipient of the information. Optibelt does not therefore, as far as permitted by law, accept liability for damage resulting outside of any specific agreement with Optibelt from the use of the information or the assumption that the information is correct and complete. The general terms and conditions of sale of Optibelt GmbH, Höxter, Germany, in particular the agreements relating to retention of title, including in their longer and extended form, shall apply exclusively. These terms and conditions can be obtained free of charge by visiting Optibelt shall not accept any of the customer's own terms and conditions that are contrary to or deviate from these terms and conditions, even if Optibelt does not explicitly object to them or unconditionally renders performance or accepts the performance by the customer irrespective of the customer's conflicting or differing terms of business. Print: 0616 ARNTZ OPTIBELT GROUP, GERMANY 37

40 Optibelt GmbH Corveyer Allee Höxter GERMANY T F E info@optibelt.com