Product-catalog_2012

Introduction 12 / GFC Product Catalog 2012 Permissible shaft loads Determination of the radial forces exerted upon the actuator and/or the output In the determination of the generated radial forces, the type of transmission elements applied to the shaft end must be taken into account by allowing for the corresponding transmission elements. Based on experience, the following values can be assumed: Transmission element Remark Factor fZ Gear wheels < 17 gears 1.1 Sprocket wheels < 13 gears 1.4 Sprocket wheels < 20 gears 1.2 Y-belt pulley Influence of preload force 1.7 Flat-belt pulley Influence of preload force 2.5 The existing radial load on the gearbox shafts is calculated according to the following relationship: FR = x fz FR = Equivalent radial load in N T = Torque in Nm d0 = Mean diameter of the applied transmission element in mm fZ = Transmission elements factor >> >> T x 2000 d0 Selection example Actual: Actuator machine Electric motor – S1 with relative stall torque MK/M = 2 Working machine Screw conveyor >> Characteristics even, nearly impact-free, small masses to be accelerated of means of operation >> Torque Ta = 126 Nm >> Output speed na = 100 1/min >> Start frequency 1 start per hour >> Daily duration of operation 8 hours >> Running time per hour 25 min under load >> Ambient temperature -10°C to 30°C >> Rotation direction right Couplings >> Actuator machine elastic gear-ring coupling Gearbox >> Gearbox/gearbox (attachable design) working machine Lubrication with synthetic oil Operating position of the B3 actuator units >> >> Determination of the necessary output torque: >> according to the mechanical wear fB = 1 (according to Table 1) fH = 1 (according to Table 2) fS = 1 (according to Table 6) Tmech.req. = fB x fH x fS x Ta = 1 x 1 x 1 x 126 = 126 Nm >> according to the thermal wear fS = 1 fE = 0.8 (according to Table 3) fT = 1.2 (according to Table 4) fL = 1 (according to Table 5) Tth.req. = fE x fT x fS x Ta = 0.8 x 1.2 x 1 x 126 = 121 Nm ED = x 100 = 42% Selection of gearbox motor size: selected: SKA 63.1 x 14,5 - 90L4 n2 actual = 96,6 1/min; TM = 127,6 Nm; PM = 1,5 kW Tmech.req. = 126 Nm < TM = 127,6 Nm Tth.req. = 121Nm < TM = 127,6 Nm The conditions for the torque ratings were observed. The radial forces indicated for these product lines rule out the simulta- neous utilization of axial forces FA and apply only for unilateral loads. These values were determined considering the least-favorable force- exertion angle a and the rotation direction in the event of exertion of force in the centre of the shaft ends. In cases of applicable loads which exceed the limit values indicated in the table – or upon the occurrence of combined forces, an individual re-calculation with indication of the force-exertion angle and the rotation direction is recommended. In these cases, we kindly request that you ask for this option. Axial forces can absorb up to 50% of the permissible radial forces. >> 25 min 60