Rexnord-Stephan S4 Catalogue

04-2007 3P0200-XX2. Product Description2.3 General technical data2.3.1 Motor output and output torqueThe motor output and torque values listed in the selection tables refer to normal operating conditions and the standardtype of construction or to comparable types of construction of the respective type of gear unit. The decisivefactor is that the drive stage does not completely run in the oil bath.2.3.2 Output speedsThe output speeds listed in the selection tables are guide values and can be calculated using the specified motorspeed n 1 (for rated operation) and the respectively valid exact gear ratio i ex . However, the actual output speeddepends on the effective motor load and the local supply conditions and, therefore, may deviate slightly.2.3.3 Service FactorThe Service Factor SF listed in the selection tables is calculated using the maximum permissible torque of thegear unit and the output torque permitted by the installed motor output. Service Factor are not standardized and,therefore, may differ dependent upon the manufacturer. For Rexnord-Stephan S4 geared motors, a gear unit withan application factor of SF = 1 already offers an enduring dimensioning and, therefore, ensure highest reliability. Incase of doubt, we would gladly provide you with more information in a personal consultation.2.3.4 WeightsThe weights specified are guide values for further dimensioning. Due to the variation in gear ratios and differenttypes of construction (oil quantity), the exact weights may deviate slightly.2.4 General construction design and dimensioning2.4.1 The gear unitGear wheelsCastingsBearingsShaftsLubricationSealsEfficiencyCarburized and hardened helical and ground or rotary-beveled spur gears. Bevel gearwheels with helical gearing, lapped bearing surfacesGG-20 cast iron as standardSufficiently dimensioned roller bearings so that input and output shaft can absorb significantexternal loadsOutput shafts made of quenched and tempered steelSplash lubrication with gear unit oil or grease for designs with oil-feed tubing, the lubricationis carried out via integrated pump. Roller bearing at the output shaft end is lubricated for lifewith grease.Radial shaft seals, with dust lip at the output sideThe efficiency of a gear unit is primarily determined by splash losses, bearing and gearingfriction. On an average across all sizes, the efficiency measures approx. 99 % for standard(or similar) types of construction for each gear stage.S12