Catalog vòng bi NTN
Ball and Roller BearingsFor New Technology NetworkRcorporationCAT. NO.2202-@/E Technical Data A- 5Deep Groove Ball Bearings B- 5Miniature and Extra Small Bearings B- 29Angular Contact Ball Bearings B- 41Self-Aligning Ball Bearings B- 77Cylindrical Roller Bearings B- 89Tapered Roller Bearings B-131Spherical Roller Bearings B-229Thrust Bearings B-265Locknuts, Lockwashers & Lockplates C- 1Catalog List & Appendix Table D- 1 WarrantyNTN warrants, to the original purchaser only, that the delivered product which is the subject of this sale (a)will conform to drawings and specifications mutually established in writing as applicable to the contract, and (b)be free from defects in material or fabrication. The duration of this warranty is one year from date of delivery.If the buyer discovers within this period a failure of the product to conform to drawings or specifications, or adefect in material or fabrication, it must promptly notify NTN in writing. In no event shall such notification bereceived by NTN later than 13 months from the date of delivery. Within a reasonable time after suchnotification, NTN will, at its option, (a) correct any failure of the product to conform to drawings, specificationsor any defect in material or workmanship, with either replacement or repair of the product, or (b) refund, in partor in whole, the purchase price. Such replacement and repair, excluding charges for labor, is at NTN'sexpense. All warranty service will be performed at service centers designated by NTN. These remedies arethe purchaser's exclusive remedies for breach of warranty. NTN does not warrant (a) any product, components or parts not manufactured by NTN, (b) defects causedby failure to provide a suitable installation environment for the product, (c) damage caused by use of theproduct for purposes other than those for which it was designed, (d) damage caused by disasters such as fire,flood, wind, and lightning, (e) damage caused by unauthorized attachments or modification, (f) damage duringshipment, or (g) any other abuse or misuse by the purchaser.THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE.In no case shall NTN be liable for any special, incidental, or consequential damages based upon breach ofwarranty, breach of contract, negligence, strict tort, or any other legal theory,and in no case shall total liabilityof NTN exceed the purchase price of the part upon which such liability is based. Such damages include, butare not limited to, loss of profits, loss of savings or revenue, loss of use of the product or any associatedequipment, cost of capital, cost of any substitute equipment, facilities or services, downtime, the claims of thirdparties including customers, and injury to property. Some states do not allow limits on warranties, or onremedies for breach in certain transactions. In such states, the limits in this paragraph and in paragraph (2)shall apply to the extent allowable under case law and statutes in such states.Any action for breach of warranty or any other legal theory must be commenced within 15 months followingdelivery of the goods.Unless modified in a writing signed by both parties, this agreement is understood to be the complete andexclusive agreement between the parties, superceding all prior agreements, oral or written, and all othercommunications between the parties relating to the subject matter of this agreement. No employee of NTN orany other party is authorized to make any warranty in addition to those made in this agreement.This agreement allocates the risks of product failure between NTN and the purchaser. This allocation isrecognized by both parties and is reflected in the price of the goods. The purchaser acknowledges that it hasread this agreement, understands it, and is bound by its terms.©NTN Corporation. 2001Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does notassume any liability to any company or person for errors or omissions. Ball and Roller BearingsNTN A-2TECHNICAL DATA CONTENTS1. Classification and Characteristicsof Rolling Bearings……………………A-51.1 Rolling bearing construction ………………A-51.2 Classification of rolling bearings …………A-51.3 Characteristics of rolling bearings ………A-92. Bearing Selection……………………A-102.1 Bearing selection flow chart ……………A-102.2 Type and character is tics ………………A-122.3 Selection of bearing arrangement ………A-133. Load Rating and Life………………A-153.1 Bearing life…………………………………A-153.2 Basic rated life and basic dynamic load rating …………………………………A-153.3 Machine applications and requisite life …A-163.4 Adjusted life rating factor…………………A-163.5 Basic static load rating……………………A-173.6 Allowable static equivalent load …………A-184. Bearing Load Calculation…………A-194.1 Loads acting on shafts……………………A-194.2 Bearing load distribution …………………A-214.3 Mean load …………………………………A-224.4 Equivalent load ……………………………A-234.5 Allowable axial load for cylindricalroller bearings ……………………………A-254.6 Bearing rated life andload calculation examples ………………A-265. Boundary Dimensions andBearing Number Codes……………A-285.1 Boundary dimensions ……………………A-285.2 Bearing numbers …………………………A-296. Bearing Tolerances…………………A-336.1 Dimensional accuracy andrunning accuracy …………………………A-336.2 Chamfer measurements and toleranceor allowable values of tapered hole ……A-446.3 Bearing tolerance measurementmethods ……………………………………A-467. Bearing Fits……………………………A-477.1 Interference ………………………………A-477.2 The necessity of a proper fit ……………A-477.3 Fit selection ………………………………A-478. Bearing Internal Clearanceand Preload……………………………A-568.1 Bearing internal clearance ………………A-568.2 Internal clearance selection ……………A-568.3 Preload ……………………………………A-64 A-39. Allowable Speed………………………A-6810. Friction andTemperature Rise……………………A-6910.1 Friction ……………………………………A-6910.2 Temperature rise…………………………A-6911. Lubrication……………………………A-7011.1 Lubrication of rolling bearings …………A-7011.2 Lubrication methods andcharacteristics ……………………………A-7011.3 Grease lubrication ………………………A-7011.4 Solid grease(For bearings with solid grease) ………A-7411.5 Oil lubrication ……………………………A-7412. External bearingsealing devices………………………A-7813. Bearing Materials……………………A-8113.1 Raceway androlling element materials ………………A-8113.2 Cage materials……………………………A-8214. Shaft and Housing Design………A-8314.1 Fixing of bearings ………………………A-8314.2 Bearing fitting dimensions………………A-8414.3 Shaft and housing accuracy ……………A-8514.4 Allowable bearing misalignment ………A-8515. Bearing Handling……………………A-8615.1 Bearing storage …………………………A-8615.2 Installation ………………………………A-8615.3 Internal clearance adjustment …………A-8815.4 Post installation running test……………A-9015.5 Bearing disassembly ……………………A-9016. Bearing Damage andCorrective Measures………………A-9317. Technical data………………………A-9517.1 Deep groove ball bearing radial internalclearances and axial internal clearances……………………………………………A-9517.2 Angular contact ball bearing axial load andaxial displacement ………………………A-9517.3 Tapered roller bearing axial load andaxial displacement ………………………A-9717.4 Fitting surface pressure…………………A-9817.5 Necessary press fit and pullout force …A-99 ●Classification and Characteristics of Rolling Bearings1.1 Rolling bearing constructionMost rolling bearings consist of rings with raceway (aninner ring and an outer ring), rolling elements (either ballsor rollers) and a rolling element retainer. The retainerseparates the rolling elements at regular intervals holdsthem in place within the inner and outer raceways, andallows them to rotate freely. See Figs. 1.1 - 1.8.Rolling elements come in two general shapes: ball orrollers. Rollers come in four basic styles: cylindrical,needle, tapered, and spherical.Balls geometrically contact the raceway surfaces of theinner and outer rings at "points", while the contact surfaceof rollers is a "line" contact.Theoretically, rolling bearings are so constructed as toallow the rolling elements to rotate orbitally while alsorotating on their own axes at the same time.While the rolling elements and the bearing rings takeany load applied to the bearings (at the contact pointbetween the rolling elements and raceway surfaces), theretainer takes no direct load. It only serves to hold therolling units at equal distances from each other andprevent them from falling out.1.2 Classification of rolling bearingsRolling bearings fall into two main classifications: ballbearings and roller bearings. Ball bearings are classifiedaccording to their bearing ring configurations: deepgroove, angular contact and thrust types. Roller bearingson the other hand are classified according to the shape ofthe rollers: cylindrical, needle, taper and spherical.Rolling bearings can be further classified according tothe direction in which the load is applied; radial bearingscarry radial loads and thrust bearings carry axial loads.Other classification methods include: 1) number ofrolling rows (single, multiple, or 4-row), 2) separable andnon-separable, in which either the inner ring or the outerring can be detached, 3) thrust bearings which can carryaxial loads in only one direction, and double directionthrust bearings which can carry loads in both directions.There are also bearings designed for specialapplications, such as: railway car journal roller bearings(RCT bearings), ball screw support bearings, turntablebearings, as well as rectilinear motion bearings (linearball bearings, linear roller bearings and linear flat rollerbearings).A-5OuterringInner ringCageBallDeep groove ball bearingFig 1.1BallCageOuterringInnerringAngular contact ball bearingFig. 1.2Inner ringOuter ringCageRollerCylindrical roller bearingFig. 1.3Outer ringRollerCageNeedle roller bearingFig. 1.4Outer ringRollerCageInner ringTapered roller bearingFig. 1.5OuterringInnerringRollerCageSpherical roller bearingFig. 1.6Inner ringOuter ringBallCageThrust ball bearingFig. 1.7Outer ringInner ringRollerCageThrust roller bearingFig. 1.81. Classification and Characteristics of Rolling Bearings ●Classification and Characteristics of Rolling BearingsA-6High-speed duplex angular contactball bearings (for axial loads)Insert ball bearingsRolling bearingsBall bearingsRoller bearingsRadial ball bearingsThrust ball bearingsRadial roller bearingsThrust roller bearingsSingle row deep groove ball bearingsSingle row angular contact ball bearingsDuplex angular contact ball bearingsDouble row angular contact ball bearingsFour-point contact ball bearingsSelf-aligning ball bearingsSingle direction thrust ball bearingswith flat back faceDouble direction angular contactthrust ball bearingsSingle row cylindrical roller bearingsDouble row cylindrical roller bearingsNeedle roller bearingsSingle row tapered roller bearingsDouble row tapered roller bearingsSpherical roller bearingsCylindrical roller thrust bearingsNeedle roller thrust bearingsTapered roller thrust bearingsSpherical roller thrust bearings ●Classification and Characteristics of Rolling BearingsA-7;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;Ultra thin wall type ball bearingsSpecialapplicationbearingsTurntable bearingsClearance adjusting needle rollerbearingsComplex bearingsBall screw support bearingsConnecting rod cage-equippedneedle rollersYoke type track rollersStud type track rollersRailway car journal roller bearings(RCT bearings)Ultra-clean vacuum bearingsLinearmotionbearingsLinear motion bearings are not listed in this catalogRubber molded bearingsSL-type cylindrical roller bearingsCrossed roller thrust bearingsSpecial application bearings are not listed in this catalog.Fig. 1.9 Classification of rolling bearings ●Classification and Characteristics of Rolling BearingsA-8Snap ringCageRivetBallInner ringracewayOuter ringracewayBearing chamferShieldInner ringside faceInner ringOuter ringWidthBearing borediameterPitch circlediameterBearing outside diameterOuter ring,front faceInner ring,back faceEffectiveload centerInner ring,front faceOuter ring,back faceContact angleFig. 1.10 Diagram of representative bearing partsDeep groove ball bearing Angular contact ball bearingInner ringwith ribRoller inscribed circle diameterOuter ring with 2 ribsL-shaped loose ribCylindrical rollerCone front face ribContact angleCup small insidediameter (SID)Cup, back faceCone, front faceCup, front faceCone, back faceEffective load centerCone back face ribTapered rollerStandoutBearing widthCylindrical roller bearing Tapered roller bearingLock washerLocknutSleeveTapered bore ofinner ringInner ringSpherical rollerOuter ringShaft washerHousing washerBallBearing bore diameterBearing outside diameterBearingheightSpherical roller bearing Single-direction thrust ball bearing [...]... exceptionally low rotational speed (nr/min x d p mm less than 10,000) For bearings used under special operating conditions, please consult NTN Engineering 3.4.1 Life adjustment factor for reliability a1 The values for the reliability adjustment factor a1 (for a reliability factor higher than 90%) can be found in Table 3.2 As the operating temperature of the bearing increases, the hardness of the bearing... pure radial loads, and for thrust bearings it refers to pure axial loads The basic dynamic load ratings given in the bearing tables of this catalog are for bearings constructed of NTN standard bearing materials, using standard manufacturing techniques Please consult NTN Engineering for basic load ratings of bearings constructed of special materials or using special manufacturing techniques 3,000 1,500... the bearing life correspondingly decreases The operating temperature adjustment values are shown in Fig 3.2 Table 3.2 Reliability adjustment factor values a1 Ln Reliability factor a1 90 L10 1.00 95 L5 0.62 96 L4 0.53 97 L3 0.44 98 L2 0.33 99 L1 0.21 Life adjustment value a3 Reliability % 1.0 0.8 0.6 0.4 0.2 100 150 200 250 300 Operating temperature ˚C 3.4.2 Life adjustment factor for material a2 The... steel bearings M: plated bearings 5S: ceramic rolling element bearings HL: HL (high lubrication) roller bearings TS2: dimension stabilized bearing for high temperature use (to 160°C) TS3: TS4: dimension stabilized bearing for high temperature use (to 200°C) dimension stabilized bearing for high temperature use (to 250°C) Basic numbers Bearing series code Dimension series code 1 Width/height series Diameter... generating equipment 24 hour continuous operation, non-interruptable A-16 ●Load Rating and Life where, Lna : Adjusted life rating in millions of revolutions (106)(adjusted for reliability, material and operating conditions) a1 : Reliability adjustment factor a2 : Material adjustment factor a3 : Operating condition adjustment factor insufficient oil film formation can be caused, for example, by the lubricating... rating life, h fh : Life factor fn : Speed factor n : Rotational speed, r/ min A group of seemingly identical bearings when subjected to identical load and operating conditions will exhibit a wide diversity in their durability This "life" disparity can be accounted for by the difference in the fatigue of the bearing material itself This disparity is considered statistically when calculating bearing life,... fatigue 1 L＝ ………（3.6） 1 1 1 1/e （ e ＋ e＋ … e） L2 Ln L1 3.4 Adjusted life rating factor The basic bearing life rating (90% reliability factor) can be calculated through the formulas mentioned earlier in Section 5.2 However, in some applications a bearing life factor of over 90% reliability may be required To meet these requirements, bearing life can be lengthened by the use of specially improved bearing... this regard, the life is adjusted by the use of an a2 factor Fig 3.2 Life adjustment value for operating temperature 3.5 Basic static load rating The basic dynamic load ratings listed in the catalog are based on NTN' s standard material and process, therefore, the adjustment factor a2 =1 When special materials or processes are used the adjustment factor can be larger than 1 When stationary rolling bearings... load increases, and if this increase in load exceeds certain limits, the subsequent smooth operation of the bearings is impaired NTN bearings can generally be used up to 120˚C If bearings are operated at a higher temperature, the bearing must be specially heat treated (stabilized) so that inadmissible dimensional change does not occur due to changes in the micro-structure This special heat treatment... diameters of 300mm or more), large axial loads being on the bearing under low speed consult conditions, or forces bearing applied, please consult with NTN Engineering For cylindrical roller bearings subjected to high axial use Type HT, Please consult NTN Engineering A-25 k Fa max 0.040 0.4Fr 0.065 0.4Fr 0.050 0.4Fr 0.080 0.4Fr 0.100 0.022 0.034 0.044 0.4Fr 0.2Fr 0.2Fr 0.2Fr ●Bearing Load Calculation . terms. NTN Corporation. 2001Although care has been taken to assure the accuracy of the data compiled in this catalog, NTN does notassume any liability. legal theory,and in no case shall total liabilityof NTN exceed the purchase price of the part upon which such liability is based. Such damages include, butare