The Design of Rolling Bearing Mountings
The Design of Rolling Bearing Mountings The Design of Rolling Bearing Mountings
82 Mast guidance bearings of a fork lift truckThe fork lift carriage must run smoothly in order tohandle the live loads efficiently. This requirement issatisfied by mast guide rollers and chain returnsheaves.Mast guide rollers (HMFR) and chain sheaves (KR) ofmodern fork lift trucks are largely fitted with doublerowangular contact ball bearings.Bearing selection, bearing designMast guide rollersFAG HMFR30x75x20.75 are preferably used for forkcarrier and lifting frame. They can accommodate radialloads, thrust loads and the moments resulting fromthese. The mast guide rollers feature thick-walled outerrings and can, therefore, accommodate even high,shock-type loads.The profile and dimensions of the outer ring are largelydictated by the standardized U-beam dimensions.Chain sheavesChain sheaves FAG KR30x75x28/27 are attached tothe hydraulically actuated upper section of the mastand serve to deflect the pull chain.Due to their relatively thick-walled outer ring, thebearings can accommodate high radial loads made upof the deadweight of the fork lift carriage, includingfork and live load. The outer ring profile is dictated bythe pull chain used; lateral guidance is provided by thetwo lips. The distance between the two ball rows, togetherwith the contact angle, provides for a wide spreadso that the return sheaves can also accommodate tiltingforces and axial guiding forces.Roller mounting is simple; they are simply placed onthe pin; axial preloading by a screw is not required.Chain return sheaves are axially locked.Machining tolerancesThe inner rings of der mast guide rollers and returnsheaves carry point load, thus a loose fit is satisfactory.The pin is machined to j6.Lubrication, sealingThe bearings are lubricated for life with a lithium soapbase grease (EP additives).Sealing is provided by single- or double-lip RSR seals.Mast guide rollerChain sheave82: Mast guide roller and chain return sheave for a fork lift truck117 FAG
83 Head pulley of a belt conveyorOne head pulley is not sufficient for very long belts,steeply inclined belts or heavily loaded belts. In suchcases several head pulleys are mounted in tandem. Inthis application, two head pulleys are arranged at thedrive station. Three identical driving motors are used:the first pulley is driven from both ends, the secondone from one end only.With an index of dynamic stressing f L ≈ 4 the bearingsare adequately dimensioned compared to field-provenbearing arrangements. Often the bearing life is limitedby wear on rolling elements and raceways and is generallyshorter than the nominal rating life (approx.50,000 h), calculated with the index of dynamic stressingf L . Improved cleanliness during mounting and operation,and a suitable lubricant, reduce wear, thus increasingthe bearing life. These influences are takeninto account in the adjusted rating life calculation bythe factor a 23 .Machining tolerancesOperating dataPower consumption 3 x 430 kW; belt width2,300 mm; belt speed 5.2 m/s; conveying capacity7,500 m 3 /h; pulley diameter 1,730 mm.Bearing selection, dimensioningThe shaft of the head pulley is supported on plummerblocks. The shaft diameter is dictated by strength considerations,thus determining the bearing bore andhousing size. Spherical roller bearings FAG23264K.MB are mounted. The one-piece plummerblock housings FAG BND3264K are made of caststeel GS-45. One of the plummer blocks acts as thelocating bearing, the other one as the floating bearing.To simplify mounting and dismounting hydraulicsleeves are used.The bearing inner rings carry circumferential load.They are fitted on the shaft with adapter sleeves FAGH3264HG.Shaft to h8 and cylindricity tolerance (DIN ISO1101) IT5/2; housing bore to H7.Lubrication, sealingGrease lubrication with a lithium soap base grease ofpenetration class 2 with EP additives (FAG rolling bearinggrease Arcanol L135V or L186V).The housing covers and rings on the shaft form nonrubbinglabyrinth seals. These multiple labyrinths arefilled with the same grease as the bearings and preventpenetration of foreign matter. In very dusty environmentsrelubrication at short intervals is required.Grease is injected into the bearing until some of thespent grease escapes from the labyrinths.FAG 118
- 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
- Page 79 and 80: 55 Bevel gear transmission for city
- Page 81 and 82: 56- 57 Spherical roller bearings as
- Page 83 and 84: 60 Spade-type rudderDesignThe slewi
- Page 85 and 86: 61-62 Ship shaft bearings and stern
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- Page 91 and 92: 65 RefinersWood chips from the wood
- Page 93 and 94: 66 Suction rollsSuction rolls are f
- Page 95 and 96: 68 Dryer rollsThe remaining water i
- Page 97 and 98: 69 Guide rollsGuide rolls guide, as
- Page 99 and 100: 70 Calender thermo rollsThe paper p
- Page 101 and 102: 71 Anti-deflection rollsAnti-deflec
- Page 103 and 104: 73 Run wheel of a material ropewayO
- Page 105 and 106: 74 Rope return sheaves of a passeng
- Page 107 and 108: 75 Rope sheave (underground mining)
- Page 109 and 110: 76 Rope sheave of a pulley blockIn
- Page 111 and 112: 77 Crane pillar mounting with a sph
- Page 113 and 114: 79 Roller track assemblyThe radial
- Page 115 and 116: 80 Crane run wheelOperating dataWhe
- Page 117: 81 Crane hookThe load suspended fro
- Page 121 and 122: Internal bearings for the tension/8
- Page 123 and 124: Belt conveyor idlersMany industries
- Page 125 and 126: 87 Bucket wheel shaft of a bucket w
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- Page 129 and 130: 91 Vibrating road rollerThe vibrati
- Page 131 and 132: 92 Double toggle jaw crusherDouble
- Page 133 and 134: 94 Double-shaft hammer crusherDoubl
- Page 135 and 136: 95 Ball tube millTube mills are mos
- Page 137 and 138: 96 Support roller of a rotary kilnR
- Page 139 and 140: Vibrating machinesVibrating screens
- Page 141 and 142: 98 Two-bearing screen with straight
- Page 143 and 144: 99 Four-bearing screenThe vibration
- Page 145 and 146: 101-103 Large capacity convertersCo
- Page 147 and 148: 104Roll bearings of afour-high cold
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- Page 161 and 162: 112 Plane sifterSifters are used in
- Page 163 and 164: Printing pressesPrinting quality is
- Page 165 and 166: 114 Blanket cylinder of a sheet-fed
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83 Head pulley <strong>of</strong> a belt conveyorOne head pulley is not sufficient for very long belts,steeply inclined belts or heavily loaded belts. In suchcases several head pulleys are mounted in tandem. Inthis application, two head pulleys are arranged at thedrive station. Three identical driving motors are used:the first pulley is driven from both ends, the secondone from one end only.With an index <strong>of</strong> dynamic stressing f L ≈ 4 the bearingsare adequately dimensioned compared to field-provenbearing arrangements. Often the bearing life is limitedby wear on rolling elements and raceways and is generallyshorter than the nominal rating life (approx.50,000 h), calculated with the index <strong>of</strong> dynamic stressingf L . Improved cleanliness during mounting and operation,and a suitable lubricant, reduce wear, thus increasingthe bearing life. <strong>The</strong>se influences are takeninto account in the adjusted rating life calculation bythe factor a 23 .Machining tolerancesOperating dataPower consumption 3 x 430 kW; belt width2,300 mm; belt speed 5.2 m/s; conveying capacity7,500 m 3 /h; pulley diameter 1,730 mm.<strong>Bearing</strong> selection, dimensioning<strong>The</strong> shaft <strong>of</strong> the head pulley is supported on plummerblocks. <strong>The</strong> shaft diameter is dictated by strength considerations,thus determining the bearing bore andhousing size. Spherical roller bearings FAG23264K.MB are mounted. <strong>The</strong> one-piece plummerblock housings FAG BND3264K are made <strong>of</strong> caststeel GS-45. One <strong>of</strong> the plummer blocks acts as thelocating bearing, the other one as the floating bearing.To simplify mounting and dismounting hydraulicsleeves are used.<strong>The</strong> bearing inner rings carry circumferential load.<strong>The</strong>y are fitted on the shaft with adapter sleeves FAGH3264HG.Shaft to h8 and cylindricity tolerance (DIN ISO1101) IT5/2; housing bore to H7.Lubrication, sealingGrease lubrication with a lithium soap base grease <strong>of</strong>penetration class 2 with EP additives (FAG rolling bearinggrease Arcanol L135V or L186V).<strong>The</strong> housing covers and rings on the shaft form nonrubbinglabyrinth seals. <strong>The</strong>se multiple labyrinths arefilled with the same grease as the bearings and preventpenetration <strong>of</strong> foreign matter. In very dusty environmentsrelubrication at short intervals is required.Grease is injected into the bearing until some <strong>of</strong> thespent grease escapes from the labyrinths.FAG 118
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