Nexen RPS12 User Manual

Contents

Nexen RPS12 User Manual Manual pdf 11 page image

11FORM NO. L-21235-G-0413ROLLER PINION INSTALLATIONNote: There are two pinion mounting styles, shaftor flange mount. Refer to the following section thatapplies to your situation. In either case it is critical tominimize radial variance. It will effect pinion preloadand positional accuracy throughout the run.Shaft Mounted Pinion InstallationNOTES:• Refer to product drawings for shaft details.• Refer to GENERAL DESIGN GUIDELINES andFigures 1 and 2 for Roller Pinion mountingrequirements.• The pinion should be mounted as close to a shaftsupporting bearing as possible to minimize shaftdeflection and obtain optimal performance.• The shaft the pinion is mounted on must meetminimum shaft insertion requirements as shownin the RPS Selection Guide drawings for properpinion support and maximum torque transmission.1. Clean the shaft the pinion will be mounted on and verifythat variance is less than ±0.013 mm [±0.0005 in] asshown in Figure 11.2. Inspect the shaft, pinion bore and the inner and outercoupling halves to ensure they are clean and have nodefects.3. Put oil that does not contain any pressure additives onthe shaft, the tapered part of the coupling and bolts asshown in Figure 11. Do not lubricate the bore of thepinion coupling or shaft where the coupling contactsit or the torque transmission capacity of the couplingwill be reduced.apply oil to these areas<0.013 mm[<0.0005 in]<0.030 mm[<0.001 in]Figure 11Figure 12 Coupling Installation DetailsAlign the outer couplingslots between the innercoupling slotsCoupling bolts Outer Coupling HalfInner Coupling Half12345Threaded holes forcoupling removalTightening Order4. Insert the outer coupling half into the roller pinion boreuntil it bottoms in the roller pinon.5. Insert the inner coupling half into the outer couplinghalf (previously inserted into the pinion) while ensuringthat the inner and outer coupling half slots are notaligned as shown in Figure 12. For RPS32 andbelow you will also have to simultaneously ensure thecoupling bolt through holes align with the pinion boltholes. On RPS40 and larger the coupling bolts threadinto the other half of the coupling, not the pinion bodyso misalignment is not possible. The threaded holesin the outer coupling end are for coupling removal.NOTE: Ensure that the slots in the two componentsthat make up the coupling are not aligned as shownin Figure 12.6. Insert the shaft into the pinion and coupling bore.7. Insert the coupling fasteners into the through holes.Only use the provided coupling fasteners.8. Locate the pinion on the shaft and lightly tighten thefasteners to take clearance out of all the couplingparts but still allow the pinion to be moved axially onthe shaft. Position the pinion and coupling assemblyon the shaft so that the gap between rack face andpinion roller bearing shoulders is even on both sides.As the coupling fasteners are tightened the pinionwill be drawn slightly in the coupling direction so it isrecommended that the pinion and coupling assemblybe offset axially away from the coupling side 3 - 5 mm[0.1 - 0.2 in] initially so when the coupling fastenersare fully torqued the pinion ends up centered on therack.9. Equally tighten the coupling fasteners with 25% ofthe recommended tightening torque listed in Table3. Start tightening at the top fastener and alternateback and forth across the face in a star pattern asshown in Figure 12. (The number of bolts will varywith RPS size.) Repeat this procedure with 50% andthen full torque. An additional 1 or 2 repetitions atfull torque are recommended to ensure all fastenershave reached their target torque values. Progressivetightening of non-adjacent coupling fasteners isimportant to prevent any misalignment of componentswhile installing the coupling.