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GEARED MOTOR UNITS - General Information (continued)TorqueHigh Torque Geared MotorsGB 21.000T ISO= limit torque: Transmittable torque of gearbox, with continuous operation, calculated in accordance toISO DP 6336 for gears and safety factor 1.This torque corresponds to a life duration equal to 50x10 6 cycles of the most stressed element(theoretically considered unlimited by the ISO DP 6336; horizontal curve in the Wöhler fatigue diagram).This torque does not represent a duration but it is useful for a quick selection of a maximum size of thegearbox.T cont= continuous torque: Transmittable torque of gearbox with continuous operation, that guarantees a durationof "h" hours, with a gearbox output rotation speed of "n 2".T contis expressed as a function of the product n 2x h .T eq= equivalent torque: T eqrepresents the value of a constant torque which determines the same duration inhours of the torque induced by the work cycle.Known as T 21...T 2nthe torque transmitted by the gearbox at the output speed n 2ìfor a time durationin hours of h ì, the equivalent torque is:whereT max= maximum torque: Value of maximum torque that the gearbox can transmit for short period of time.T max= 1,25 x T contwhen n 2x h = 50.000In application with high number of cycles and a torque near the maximum, one must take into account anopportune safety factor. In this case it is recommended that our Tech. Dpt. be contacted.T imp= impulsive torque: Value of static torque or an istantaneous peak load that the gearbox can withstand:T imp= ( from 1,25 to 1,9 ) x T contwhen n 2x h = 50.000Each coefficient is given in the life time table.Efficiencyn m= mechanical efficiency: ratio between the output power and input power.Normally it is considered to be equal to 0,97 - 0,98 per reduction stage that makes up the gearbox;it depends upon various factors, of which speed, torque, ratio, working position and lubrication.Pag. 8HT 05 / D / 107 / 0509 / E
High Torque Geared MotorsGB 21.000GEARBOX SELECTION METHODSelectionOnce established the selection criteria, which can be defined using an ISO or AGMA safety factor, based upon theclass according to the F.E.M. standard or by expressing a minimum life duration, the equivalent output torque T eqis determined as well as the required duration and the reduction ratio. Using these criteria the gearbox is selected.- safety factor ISO / AGMA: the gearbox must guarantee the requested theoretical lifetime.- F.E.M. class: the gearbox must guarantee that the requested theoretical lifetime correspond to that indicated bythe F.E.M. class as a function of the max and T eq.- Life duration: the gearbox must have a life duration greater than that required as a function of T eq .For example, table on page 17 shows the continuous torques as a function of gearbox size and the reduction ratio.The start-up torque must not exceed the gearbox maximum torque.The number of start-up per hour and the hours of operation per day must be carefully considered.If the output speed is constantly less than 1 n/min., there may be problems with the lubrication of the outputstage, which could reduce the calculated theoretical life. Contact our Tech. Dpt. for a proper selection.DURATION REQUIRED BY THE FEM CLASSESclassduration withT eq
Page 1: HYDRAULIC COMPONENTSHYDROSTATIC TRA
Page 4 and 5: GEARED MOTOR UNITS - General Inform
Page 10 and 11: GEARBOX SELECTION METHOD (continued
Page 12 and 13: MOTOR MOUNTING INSTRUCTION (continu
Page 14 and 15: GEARBOX MOUNTING INSTRUCTION (conti
Page 16 and 17: High Torque Geared MotorsGB 21.000M
Page 18 and 19: High Torque Geared MotorsGB 21.000O
Page 20 and 21: High Torque Geared MotorsGB 21.000G
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