timing belt drives selection cross+morse table 1 service factors f1 driven machine load `soft starts the machines listed below are representative examples only select the class whose load characteristics most closely approximate those of the machine being used for drives with heavy pulsating or high shock loads consult cross+morse electric motor ac star delta start dc shunt wound internal combustion engines and other prime moves fitted with centrifugal clutches dry or fluid couplings or electronic soft start start devices operating hours per day under 10 1.0 10-16 1.2 over 16 1.4 under 10 1.2 types of driver power transmission solutions `heavy starts te l electric motor ac direct-on-line start dc series and compound wound hydraulic motors internal combustion engines with mechanical drive prime movers not fitted with soft start devices operating hours per day 10-16 1.6 over 16 1.8 +44 121 360 0155 load type smooth typical machinery business equipment light domestic machinery tac
|
power rating tables classical timing belts power ratings kw for 3/8 wide xl series belts 1/5 pitch number of teeth small pulley 100 200 300 400 500 600 800 1000 1200 1400 1500 1600 1750 2000 2400 2800 3000 3200 3500 4000 4500 5000 6000 7000 8000 9000 10000 10 .004 .008 .012 .016 .020 .025 .034 .042 .050 .059 .062 .070 .076 .087 11 .004 .009 .014 .018 .023 .027 .036 .046 .055 .064 .070 .076 .081 .095 .112 .132 .140 .151 .165 12 .005 .010 .015 .020 .025 .030 .040 .050 .060 .071 .075 .084 .090 .102 .123 .144 .155 .165 .180 .205 .231 .257 14 .006 .011 .017 .023 .029 .035 .048 .060 .071 .084 .090 .096 .104 .119 .142 .167 .180 .190 .210 .240 .269 .297 15 .006 .012 .019 .025 .031 .037 .050 .065 .077 .090 .096 .102 .112 .130 .155 .180 .192 .200 .225 .288 .310 .380 .441 16 .007 .013 .020 .027 .033 .040 .054 .069 .081 .096 .102 .111 .120 .136 .165 .192 .205 .220 .239 .272 .306 .340 .405 .468 18 .007 .015 .022 .029 .037 .046 .063 .077 .091 .109 .115 .123 .134 .155 .184 .215 .230 .247 .268 .305
|
high power metric timing belts cross+morse high power rpp plus and rpp gold belts the improved design rpp plus and rpp gold belts can transmit higher torques whilst still operating on standard htd pulleys replacing a standard metric belt with the equivalent rpp plus belt can enable up to 100 more torque transmission whilst the power transmission solutions equivalent rpp gold belt provides up to 200 more both are available in 8mm and 14mm pitch 8mm pitch rpp plus high power belts type 8h belt no length teeth mm 288 320 352 384 408 480 536 544 560 600 632 640 680 720 800 840 880 920 960 1040 36 40 44 48 51 60 67 68 70 75 79 80 85 90 100 105 110 115 120 130 20mm wide belt cat no 288-8h20 320-8h20 352-8h20 384-8h20 408-8h20 480-8h20 536-8h20 544-8h20 560-8h20 600-8h20 632-8h20 640-8h20 680-8h20 720-8h20 800-8h20 840-8h20 880-8h20 920-8h20 960-8h20 1040-8h20 wt kg 0.033 0.036 0.040 0.043 0.046 0.054 0.061 0.061 0.063 0.068 0.071 0.072 0.077 0.081 0.090 0.095 0.099 0.104 0.108 0.118 30mm wid
|
plain bore pulleys 8m belts cross+morse catalogue no no teeth z pulley type pitch circle diameter dp 56.02 61.12 66.21 71.30 76.39 81.49 86.58 91.67 96.77 101.86 112.05 122.23 142.60 162.97 183.35 203.72 229.18 285.21 366.69 427.81 488.92 56.02 61.12 66.21 71.30 76.39 81.49 86.58 91.67 96.77 101.86 112.05 122.23 142.60 162.97 183.35 203.72 229.18 285.21 366.69 427.81 488.92 min bore d max bore d outside flange diameter diameter do a pulley width f bore rim approx hub length diameter diameter weight l n kg m 116 137 158 180 204 254 336 400 460 116 137 158 180 204 254 336 400 460 116 137 158 180 204 254 336 400 460 137 158 180 204 254 336 400 460 pulley types the pulley types referred tosolutions power transmission in tables are as drawings below suffix `f indicates pulley has flanges pulley below dividing line in tables are manufactured in cast iron pulleys 112 teeth 80 teeth on 8m-85 and above incorporate lightening holes in design 8mm
|
taper bore pulleys for htd size 5m 8m belts catalogue no no teeth z pulley type pitch circle dia dp taper bush ref max bore d outside flange diameter diameter do a pulley width f bore hub rim approx length diameter diameter weight l m n kg 5mm pitch pulleys for 15mm wide belt ref 5m15 34-5m-15 36-5m-15 38-5m-15 40-5m-15 44-5m-15 48-5m-15 56-5m-15 64-5m-15 72-5m-15 80-5m-15 90-5m-15 112-5m-15 136-5m-15 22-8m-20 24-8m-20 26-8m-20 28-8m-20 30-8m-20 32-8m-20 34-8m-20 36-8m-20 38-8m-20 40-8m-20 44-8m-20 48-8m-20 56-8m-20 64-8m-20 72-8m-20 80-8m-20 90-8m-20 22-8m-30 24-8m-30 26-8m-30 28-8m-30 30-8m-30 32-8m-30 34-8m-30 36-8m-30 38-8m-30 40-8m-30 44-8m-30 48-8m-30 56-8m-30 64-8m-30 72-8m-30 80-8m-30 90-8m-30 112-8m-30 144-8m-30 34 36 38 40 44 48 56 64 72 80 90 112 136 22 24 26 28 30 32 34 36 38 40 44 48 56 64 72 80 90 22 24 26 28 30 32 34 36 38 40 44 48 56 64 72 80 90 112 144 9f 9f 9f 9f 9f 8f 8f 8f 8 8 8 8 7 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 8f 8f 8f 11f 11f 11 11 5f 5f 5f 5f 9f 9f 9f 9f 9f 9f
|
green belt selection procedure a green belt used for linear application can be selected either by consideration of the loads and accelerative forces applied to the belt or by the power applied to the driving pulley and the speed of rotation in order to select the green belt it is first necessary to compile together dependant on method of selection the following relevant design parameters a b c d e f g h i j is drive horizontal or vertical the mass of all moving parts to be moved by the belt maximum belt velocity maximum rate of acceleration frictional forces due to load being moved desired pulley diameters pulley centres/total length of movement required driving motor power driving pulley speed r.p.m any width constrictions cross+morse for vertical drives corrected value fp m mb mc a 9.807m ff n power transmission if significantly changed recheck belt width section 6 solutions the belt can then be specified by type width x length e.g u5m 20e x 1500 1500mm length belt te l terms
|
classical series timing belts cross+morse double sided classical belts construction of these belts same as standard classical belts but with teeth on both sides of the belt both faces of belt have nylon facing for wear resistance these belts enable driving of pulleys by both sides of belt power transmission solutions xl series double sided belts 1/5 pitch belt length code 120xl 130xl 140xl 150xl 156xl 160xl 170xl 180xl 182xl 190xl 198xl 200xl 202xl 210xl 212xl 214xl 220xl 228xl 230xl 234xl pitch length mm 304.80 330.20 355.60 381.00 396.24 406.40 431.80 457.20 462.28 482.60 502.92 508.00 513.08 533.40 538.48 543.56 558.80 579.12 584.20 594.36 no teeth n 60 65 70 75 78 80 85 90 91 95 99 100 101 105 106 107 110 114 115 117 1 te l /4 wide belt wt kg 4.4 4.8 5.1 5.5 5.7 5.9 6.2 6.6 6.7 7.0 7.3 7.3 7.4 7.7 7.8 7.9 8.1 8.4 8.4 8.6 3 /8 wide belt wt kg 6.5 7.0 7.6 8.2 8.5 8.7 9.3 9.8 10.0 10.4 10.9 11.0 11.1 11.5 11.7 11.8 12.1 12.5 12.6 12.9 cat no 120xl025dd 130xl025dd 140xl025dd 150xl0
|
taper bore pulleys for `l series timing belts catalogue no 3 8 cross+morse no teeth z pulley type pitch circle diameter dp 54.57 57.61 60.64 63.67 66.70 69.73 72.77 75.80 78.83 81.86 84.89 90.96 97.02 109.15 121.28 145.53 181.91 218.30 254.68 291.06 363.83 54.57 57.61 60.64 63.67 66.70 69.73 72.77 75.80 78.83 81.86 84.89 90.96 97.02 109.15 121.28 145.53 181.91 218.30 254.68 291.06 363.83 54.57 57.61 60.64 63.67 66.70 69.73 72.77 75.80 78.83 81.86 84.89 90.96 97.02 109.15 121.28 145.53 181.91 218.30 254.68 291.06 363.83 taper bush size max bore d outside flange diameter diameter do a pulley width f bore rim hub approx length diameter diameter weight l n m kg 120 166 202 236 270 343 120 166 202 236 270 343 38 38 45 45 48 52 52 54 60 60 65 71 75 86 96 120 166 202 236 270 343 pulley power transmission solutions types pulley types referred to in tables are as drawings below the suffix `f indicates pulley has flanges pulleys below dividing line in tables
|
standard stock polyurethane belts cross+morse standard belts are available in a number of stock widths as indicated below for metric belts an individual belt reference number is obtained by prefixing the catalogue reference shown in tables by its width in mm for example a 280mm long belt of t5 construction with 12mm width has reference power transmission solutions 12t5-280 belt width construction length for imperial pitch belts the references are as rubber belts but prefixed `u e.g u150xl037 other pitches belt lengths and widths can supplied to order contact cross+morse for further information te l +44 121 360 0155 2.5mm pitch belts ref t 2 5 cat ref t2.5-120 t2.5-145 t2.5-160 t2.5-177 t2.5-200 t2.5-230 t2.5-245 t2.5-265 t2.5-285 t2.5 290 t2.5-305 t2.5-317 t2.5-330 t2.2-380 t2.5-420 t2.5-480 t2.5-500 t2.5-600 t2.5-620 t2.5-650 t2.5-680 t2.5-780 t2.5-880 t2.5-915 t2.5-950 t2.5-1185 length mm 120 145 160 177.5 200 230 245 265 285 290 305 317.5 330 380 420 480 500 600 620 650 680 780
|
pulleys for metric polyurethane at 5 belts at series timing pulleys designed to complete the power transmission package for the enhanced power `at series belts are the cross pilot bore stock pulleys for at5 and at10 belt drives the `at series belts provide increased power capacity in a polyurethane belt by increasing the belt tooth size and also the tension members the increased tooth width of at series belts increases both the strength and stiffness of the tooth improving meshing with the pulley s also the longer flat surface of the teeth enables better transmission of radial loads cross+morse higher strength tension members improvepower transmission solutions pitch accuracy along with increasing the tensile strength of the belt which combined with the stronger teeth enables increase in power transmitted by approx 50 over the `t series belts the `at belt design provides improved accuracy in linear drives with reduced backlash when using standard pulleys the longer tooth reduces po
|
timing belt trouble shooting guide cross+morse when a timing belt drive is correctly designed and installed with proper consideration given to design factors for service conditions premature failure should not occur if problems are encountered the table below may help identify the cause and suitable corrective action in addition to problems shown less apparent causes of drive failure may exist such power transmission solutions as excessive reverse bending sub-minimum diameter idler etc and for complete assurance in determining cause of failure and correct remedy it is always advisable to consult a drive specialist te l causes of premature belt failure mode of failure abnormal wear of the belt a on the side of the tooth probable causes belt excessively taut excessive overloading incorrect contour or diameter of pulley b on the bottom of the tooth c at the tooth root d on the side of the belt excessive installation tension incorrect diameter of pulley incorrect contour or diameter of p
|
