Rexnord-Stephan S4 Catalogue

04-2007 3P0200-XX7. Technical AppendixGear unit connection - Dimensional assignmentGear unit SI4 SP4 SK4connectionS115 SI..1. SP..1 / SP..2 SK..2S162 SI..2 / SI..3 SP..3 SK..3 / SK..4.S235 SI..4 / SI..5 SP..4 / SP..5 SK..5 / SK..6.S300 SI..6 / SI..7 SI..8 / SI..9 SP..6 / SP..7 SP..8 SK..7 / SK..8. SK..9For permissible loads at the drive shaft please contact Rexnord-Stephan.7.4.8 SI4 gear units SCA, SFA and SCP with integrated oil pumpSome types of construction of SI4 gear units offer the possibility of supplying an absolutely oil-proof version forvertical mounting positions (output shaft is down).For some applications, particularly in chemistry, pharmacy, food processing technology and wastewater treatmentand drinking water purification, it is desirable to use absolutely leak-free drives. Since radial shaft seal rings arealways wear parts and will eventually leak dependent upon the loads that occur, the regular sealing system maycause danger of oil leakage via the shaft seal.With our design, the output shaft is safely blocked from the oil supply by means of a tubing. To ensure sufficientlubrication of all relevant components, such as roller bearing and gearing, an additional oil pump (gear pump) isintegrated at the intermediate shaft of the gear unit. Using a corresponding inner tubing system, the lubricant isdistributed inside the gear unit.To ensure a sufficient flow rate, the following speed ranges must be taken into account at the output shaft.B (2-stage)C (3-stage)Version n 2min n 2max n 2min n 2max1/min 1/min 1/min 1/minSCP 30 270 10 80SCA 30 270 10 80SFA 30 270 10 80This version offers an additional advantage on top of the absolute oil-tightness. Due to the low oil level, no gearingmoves directly in oil. This results in nearly no splash losses that could lead to a heating of the gear unit.Particularly with low gear ratios, i.e. high output speeds, splash lubrications frequently lead to thermal limits due tooccurring splash losses in vertical types of construction. This tubing version allows for largely eliminating the influenceof splash losses. This, in turn, allows the drive to be used at relatively high output speeds. Expensive coolingsystems can be eliminated.7.4.9 Noise levelThis chapter discusses the noise levels (sound pressure levels) of the S4 gear unit series of size 1 to 9. designindex 6 and 7. Motor noises are not taken into account.Table 1 listed below shows sound pressure level Lp' that can be expected with high probability for standardizedconditions. Slight deviations are possible due to manufacturing tolerances.To obtain values from other conditions, correcting factors must be added according to Tables 2-4.L p = L p ' + K 1 + K 2 + K 3T44