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GEARBOX SELECTION METHOD (continued)VerificationsHigh Torque Geared MotorsGB 21.000Gearbox output support:For each gearbox the dynamic radial loads according to ISO 281 for a duration of L10 corresponding to n 2x h = 100.000are shown in the diagrams.For different durations, applicable radial loads can be obtained by multiplying the values in the diagrams by the correctionfactor kf.With regard to eventual axial loads, one must ensure that they do not exceed the maximum allowed values.Output torque: the output torque must never exceed T max.In the event that brakes are mounted on the gearbox or the motor, one must ensure that the braking torque does notexceed the maximum torque of the gearbox itself multiplied by 1,1; with regard to the real braking torque, it is alsonecessary to consider the efficiency of the gearbox.Input speed: must not exceed the maximum gearbox input speed.Thermal power: in the event that the installed power is greater than the thermal power of the gearbox,it is necessary to provide a cooling circuit or to select a larger gearbox.The power to dissipate is: P d= ( P 2- P t)x(1-ç m)where P 2is the power transmitted by the gearbox.In the event that thermal power is not exceeded, but the application is particularly heavy, it may be necessary toinstall an oil circulation and filtering system.MOTORS SELECTION METHODHydraulic DrivesKnowing the hydraulic circuit pressure, from which the Dp of the motor can be obtained, the torque T 1, the speed n 1required at the input of the gearbox, the hydraulic motor capacity must be greater or equal to:where n mis the mechanical efficiency.The necessary supply flow rate is:where n vis the volumetric efficiency of the motor.Please use the following table as a guide for hydraulic motor selection.HYDRAULIC MOTORSUse medium - heavyPressure - bar 175 - 250Type of motor radial pistonSpeed - n/min. < 500 m 0,90 v 0,96Pag. 10HT 05 / D / 107 / 0509 / E
High Torque Geared MotorsGB 21.000MOTOR MOUNTING INSTRUCTIONCircuit and Application NotesMineral Oil recommendationsThe fluid should be a good hydraulic grade, non-detergent Mineral Oil.It should contain anti-oxidant, antifoam and demulsifying additives. It should contain antiwear or EP additives.WARNING: Automatic transmission fluids and motor oils are not recommended.Temperature limitsAmbient min. -30°C (-22°F)Ambient max. + 70°C (158°F)Max. operating temperature range.Min -20°C (-4°F) +10°C (50°F)Max. + 80°C (175°F) +54°C (130°F)Note: To obtain optimum service life from both fluid and hydraulic systems components, a fluidoperating temperature of 40°C is recommended.FiltrationFull flow filtration (open circuit), or full boost flow filtration (closed circuit) to ensure system cleanliness toISO 4406/1986 code 18/15/12 (Class 7 NAS 1638) or cleaner.Start - upFill the motor crankcase with clean system fluid.Noise levelThe airborne noise level is less than 66.7 dB(A) DIN (dB (A) NFPA) through the “continuous” operating envelope.Where noise is a critical factor, installation resonances can be reduced by isolating the motor by elastomeric meansfrom the structure and the return line installation.Potential return line resonances originating from liquid borne noise can be further attenuated by providing a return lineback pressure of 2 to 5 bar.HT 05 / D / 107 / 0509 / E Pag. 11
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