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You get increased performance through Roots' <br /> extensive improvement program and life testing. o% 3 <br /> Here's how... + ® w", t, € <br /> 1. Exclusive gearbox design 5.Versatile mounting <br />< 1' <br /> "Figure S"gearbox actually improves oil distribu- You can mount the Universal RAlmin multiple post- <br /> tion for longer gear and bearing life with smoother tions to accommodate your specific needs.With your <br /> operation. choice of 17 frame sizes,there's a Universal RAI that ° o L x <br /> fits right into your QEM or replacement application- <br /> 2. Tager mounted timing gears <br /> 6:Rugged steel mounting feet <br /> Sion mabhined and aper f urized and dited6o alloy steel shaitally steel ears are sreci- The Universal RAI can be easily changed from <br /> + � ;s <br /> eliminating the need for unreliable timing pins. horizontal flow to vertical flow using the same mount- <br /> Ing feet.They're even interchangeable with the mount- ® Q <br /> $. Original Roots impeller design ing holes of competitive Roots-type blowers. <br /> Dynamically balanced Roots impellers are center- <br /> timed to allow either c€ockwise or counterclockwise <br /> rotation. A <br /> 4. Long-life all riction hearings , ' ° t ,t,�; Operating Principle <br /> r <br /> Oversize cylindrical roller bearings at the drive shaft _ +2 <br /> handle V-belt stress;all bearing points are engineered <br /> for long service life. <br /> U. <br /> POSITION 1 POSITION 2 <br /> * b POSITIONS POSITION4 .. <br /> $` Two"Figure S"lobe impellers, <br /> ® - mounted on parallel shafts,rotate in <br /> opposite directions.As each.impeller <br /> Q T_ passes the blower inlet,it traps a definite <br /> volume of air and carries it around the <br /> case to the blower outlel,where the air is <br /> discharged.With constant speed opera- <br /> ^, tion,the displaced volume is essentially <br /> II the same regardless of pressure,tem- <br /> tr wV( perature or barometric pressure. <br /> ��� J�.��� Timing gears control the relative po- <br /> \� ° ° °�:' ° �� —° sition of the impellers to each other and <br /> I CC/ ` -�� maintain small but definite clearances. <br /> This allows operation without lubrication <br /> ° being required inside the air casing. <br /> sVEArICAL GEAR EN6 pR1VE SHAFT ON HpITOM DRIVE SHAFT ON TOP HORIZONTAL GEAR END DRIVE SHAFT ON LEFT pftNE SHAFT ON RIGHT ' <br /> VERTICAL MOUNTING r r� HORIZONTAL MOUNTING <br /> (Horfimtal air now) _ (verCical air flow) <br /> 1 <br /> I 1 <br /> i 4 <br />