TIMING PULLEYS & BELTS Timing Belts and Pulleys
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1 Timing Belts and Pulleys Z e d o1 F U1 v n1 d k1 z 1 a = Centre distance (mm) M B = Acceleration torque (Nm) t B = Acceleration time (s) d = Bore (mm) r = Density (kg/dm 3 ) M = Torque (Nm) n = RPM d k = Outside diameter (mm) Peripheral Force F U = M d 0 F U = P n d 0 F U = 10 3 P v Angular Velocity w = p n 30 [ ] Belt length i 1 L B (z2 + z 1 ) + 2 a + 1 (z 2 z 1 ) a p Mass Moment of Inertia J = B r (dk 4 d 4 ) Centre Distance (approx.) for i = 1 a z B z1 t 2 Rpm n = z B1 L B F zul P = Power (kw) J = Moment of Inertia (kgm 2 ) L B = Belt length (mm) i = Ratio F zul = Allowable tensile load (N) B = Pulley width (mm) t = Pitch (mm) v = Velocity (m/s) v d 0 a Torque M = d 0 F U M = P n M = d 0 P 2 v t Belt length when i = 1 L B = 2 a + p d 0 L B = 2 a + z t Velocity d v = 0 n Acceleration Torque M B = J n 9.55 t B F U d k2 d o2 n2 z 2 = Peripheral force (N) w = Angular velocity (s -1 ) d 0 = Pitch circle diameter (mm) z = No. of teeth when i = 1 z 1 = No. of teeth of small pulley z 2 = No. of teeth of large pulley z B = No. of teeth in the belt = No. of teeth in mesh z e Power P = M n P = F U d 0 n P = F U v 10 3 Pitch Circle Diameter d 0 = z t p Centre Distance (approx.) for i 1 a L B - (p/2)(d 01 + d 02) L + B - (p/2)(d 01 + d 02 ) 2 - (d 02 + d 01 ) ( )
2 Synchronous and Breco Timing Belts and Pulleys Pulley Tooth Versions All Ondrives pulleys are supplied with normal backlash tooth gap form. SE and zero backlash are available on request. Please contact our Technical department. Flexibility The minimum number of teeth on the pulley / minimum diameter recommended for trouble free operation is based on the belt type selected. When considering drives with reverse bending (contraflexure), it is especially important to remember that the minimum number of teeth on the pulley / minimum diameter must be increased. Values are given at the end of each belt type section. Pre-tension The pre-tension F V is determined by the maximum operating peripheral force F U. The purpose of pre-tension is to allow both sides of the belt between the pulleys to run without sagging. It is important to recognise the difference between the loaded (tight) and unloaded (slack) side of a drive as when power is applied, the tension increases in the loaded (tight) side and decreases proportionately in the slack side. The pre-tension is correctly set when the unloaded (slack) side of the belt always remains taut under the maximum operating loads. Any sag or flap indicates too low a pre-tension. For two pulley drives: Pre-tension 0.5 Peripheral force F V 0.5 F U For multiple pulley and linear drives: Pre-tension 1.0 Peripheral force F V 1.0 F U Tension Member Tensile Loading F zul The timing belt is designed correctly when the tension member loading value is not exceeded. Values for each belt can be found on the product page. F u < F zul Tooth Sheer Strength The belt width (in cm) required to transmit known peripheral force F U, torque M or power P without exceeding the maximum allowable tooth shear strength is calculated using any of the following formulae and the values from the tables: b = belt width (in cm) F Uspez = specific peripheral force M spez = specific torque P spez = specific power To calculate the number of teeth in mesh, z e : z e = z 1.arc cos (z 2 -z 1 ).t 180 2pa F U 100. M P b = b = b = ze.f Uspez z1.z e.m spez z1.z e.p spez z 1 z 2 T2.5 Specific Tooth Sheer Strength t a = No. of teeth on the small pulley = No. of teeth on the large pulley = pitch in mm = centre distance in mm z e = No. of teeth in mesh (see below) z emax = 12 for T, AT, AT-G3 and Breco M , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
3 Synchronous and Breco Timing Belts and Pulleys T5 Specific Tooth Sheer Strength , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , T10 Specific Tooth Sheer Strength , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , AT5 Specific Tooth Sheer Strength , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , For designs over the quoted speed, please contact our Technical Department.
4 Synchronous and Breco Timing Belts and Pulleys AT10 Specific Tooth Sheer Strength , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , AT5-G3 Specific Tooth Sheer Strength , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , AT10-G3 Specific Tooth Sheer Strength , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , For designs over the quoted speed, please contact our Technical Department.
5 Synchronous Drive Belt Width b The synchronous drive belt width b in mm results from the power P to be transmitted, corrected by the overall service factor c o and the power rating P R corrected by the teeth in mesh factor c 1 and the length factor c 5. The following applies to standard belt width: P c o P R c 1 c 5 If P c o > P R c 1 c 5 The next larger standard width should be applied. To obtain a synchronous drive belt width as narrow as possible, the toothed pulleys should be selected as large as possible. This will result in a longer service life at a lower bending load. Overall Service Factor c o The overall service factor c o takes into consideration safety factors for special operating conditions caused by loading conditions, acceleration and fatigue. It is calculated on the basis of the following factors: c o = c 2 + c 3 + c 4 An initial selection is made using the belt graphs based on P. c o and speed of the small pulley. This is then checked against P R.c 1.c 2 P R is taken from the Power Rating Tables. Where the graph offers two possible pitches a check should be made of both. Number of Teeth in Mesh Factor c 1 Ze: 2 = 0.2, 3 = 0.4, 4 = 0.6, 5 = 0.8, 6 = 1.0 Acceleration Factor c 3 Ratio: = 0, 5-4 = 0.1, = 0.2, = 0.3, 3.50 = 0.4 Fatigue Factor c 4 Daily Period of Operation: hours = +0.2, Daily period of operation 16+ hours = +0.4, Additional Belt Deflection (e.g. by means of tensioning rolls): = +0.2, Intermittent operation = 0.2 Length Factor c 5 5M Belt Length L B : <441 = 0.0, = 0.9, = 1.0, = 1.1, >1100 = 8M Belt Length L B : <640 = 0.8, = 0.9, = 1.0, = 1.1, >1799 = 14M Belt Length L B : <1400 = 0.8, = 0.9, = 0.95, = 1.0, = 1.05, >3499 = 1.1 Load Factor c 2 The load factor considers the type of prime mover (driver) and driven machine. Values are reference only. Conveyor Systems : Belt conveyors for light materials Conveyor Systems : Belt conveyors for ore, coal, sand for heavy materials : Elevators, screw conveyors Stirrers : Mixers, liquid Stirrers : Mixers, Semi-liquid Machine Tools: Lathes Machine Tools: For drilling, grinding, milling, planing Brickworks Machinery : Milling machines Brickworks Machinery : Loam mills Textile Machinery : Bobbin winding and warping Textile Machinery : Spinning, twisting and weaving Paper Making : Agitators, calenders, drying Paper Making : Pumps, beaters, pumps, grinders Printing Machinery : Cutting, slitting, folding Printing Machinery : Rotary presses Fans / Blowers : Exhausters, radial blowers Fans / Blowers : Pit ventilators, axial blowers Pumps : Centrifugal and gear pumps Pumps : Reciprocating Generators : Generators and exciters Elevators : Elevators and hoists Centrifuges Mills : Hammer mills Mills : Ball, roller and gravel mills Electric Motors with slow starting torque (up to times the rated torque). Water and steam turbines, internal combustion engines with 8 and more cylinders Electric Motors with high Electric Motors with medium starting torque and braking starting torque ( to 2.5 times the rated torque). torque (more than 2.5 times the rated torque). Internal Internal combustion engines combustion engines up to 4 with 4-6 cylinders cylinders Pre-tension After an initial selection has been made our Technical department would be happy to advise on checking the belt tension and its correct setting. Tension Member Tensile Loading F zul The timing belt is designed correctly when the tension member loading value is not exceeded. Values for each belt can be found on the product page. F u < F zul
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7 TIMING PULLEYS & BELTS Power Rating 5M 9mm Belt Width 5M 15mm Belt Width
8 TIMING PULLEYS & BELTS 5M 25mm Belt Width 8M 20mm Belt Width Power Rating
9 TIMING PULLEYS & BELTS Power Rating 8M 30mm Belt Width 8M 30mm Belt Width 8M 50mm Belt Width
10 TIMING PULLEYS & BELTS 8M 85mm Belt Width 14M 40mm Belt Width Power Rating
11 TIMING PULLEYS & BELTS Power Rating 14M 55mm Belt Width 14M 85mm Belt Width
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