The Design of Rolling Bearing Mountings
The Design of Rolling Bearing Mountings The Design of Rolling Bearing Mountings
22: Flywheel bearing arrangement of a car body press35 FAG
23 Vertical wood milling spindleOperating dataInput power 4 kW; nominal speed 12,000 min –1 .Maximum load on the work end bearing:radial – maximum cutting load of 0.9 kN,axial – shaft weight and spring preload of 0.2 kN.Maximum load on the drive end bearing:radial – maximum belt pull of 0.4 kN,axial – spring preload of 0.5 kN.Bearing selectionSince a simple bearing arrangement is required thebearing is not oil-lubricated as is normally the case forsuch high-speed applications. Experience has shownthat grease lubrication is effective if deep groove ballbearings of increased precision with textile laminatedphenolic resin cages are used. Where very high speedshave to be accommodated, angular contact ball bearingswith a small contact angle (spindle bearings) areoften provided. These bearings are interchangeablewith deep groove ball bearings and can, therefore, beemployed without modifying the spindle design.The work end features a deep groove ball bearing FAG6210TB.P63 and the drive end a deep groove ballbearing FAG 6208TB.P63. Two Belleville springwashers preload the bearings to 500 N. Clearance-freeoperation and high rigidity of the spindle system is,therefore, ensured. In addition to this, the spring preloadensures that both bearings are loaded under alloperating conditions, thus avoiding ball skiddingwhich may occur in unloaded bearings at high speeds,which in turn may cause roughening of the surfaces(increased running noise).As a rule, the bearings have to be relubricated every sixmonths, and for high speeds even more often.Non-rubbing labyrinth seals are used instead of rubbing-typeseals in order to avoid generation of additionalheat.Machining tolerancesSeat Diameter Cylindricity Axial runouttolerance tolerance tolerance of the(DIN ISO 1101) abutment shoulderShaft js5 IT2/2 IT2Housing JS6 IT3/2 IT3(work end)Housing H6 IT3/2 IT3(drive end)Work endBearing dimensioningThe size of the bearings is dictated by the shaft diameter,which in turn is based on the anticipated vibrations.The bearing sizes thus determined allow a sufficientbearing life to be achieved so that a contaminationfactor V = 0.5...0.3 can be assumed if great care wastaken to ensure cleanliness during mounting andmaintenance (relubrication). With this very good toutmost cleanliness the bearings even can be failsafe.Lubrication, sealingGrease lubrication with FAG rolling bearing greaseArcanol L74V. The bearings are packed with grease andreplenished at the required intervals. In view of thehigh speeds the grease quantities should not, however,be too large (careful regulation) so that a temperaturerise due to working of the grease is avoided.23: Vertical milling cutter spindleDrive endFAG 36
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- Page 14 and 15: PulleyDrum5: Drum mounting of a dom
- Page 16 and 17: 6: Rotor bearing arrangement of a v
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- Page 21 and 22: 9-18 Work spindles of machine tools
- Page 23 and 24: 10 NC-lathe main spindleOperating d
- Page 26 and 27: 13 High-speed motor milling spindle
- Page 28 and 29: 15 Vertical high-speed milling spin
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- Page 32 and 33: 19 Rotary table of a vertical lathe
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- Page 42 and 43: 27 Spur gear transmission for a rev
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- Page 67 and 68: 45Axle box roller bearingsof series
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- Page 73 and 74: 50Axle box roller bearingsaccording
- Page 75 and 76: 52Universal quill drivefor threepha
- Page 77 and 78: 54 Spur gear transmission for the u
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- Page 81 and 82: 56- 57 Spherical roller bearings as
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22: Flywheel bearing arrangement <strong>of</strong> a car body press35 FAG
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