Technical features. Types of combined bearings

Transcription

1 OMBINE BEARINGS

2 Tecnical features Types of combine bearings Naella combine neele bearings type RAX an erivatives are esigne to support simultaneously bot a raial an an axial loa. Tey comprise a neele trust bearing (or roller trust bearing) an neele cage retaine in a coon outer ring. Te tecnical caracteristics of te trust bearing an te neele cage are set out in te appropriate sections. Tese bearings form one integral unit permitting easy storage, anling an fitting. Teir ig raial an axial loa capacities an small space requirement enable cost effective solutions to be acieve. alculations for combine bearings are carrie out taking te axial component an te raial component separately witout transforming te axial loa into an equivalent raial loa. Te operation of te trust bearing an te neele cage inepenent of one anoter preclues any interaction armful to precise axial an raial rotation. Axial expansion of te saft, for example, will ave no effect on te accuracy of te raial component. Te bearings can be use witout inner rings or trust plates, if te saft journals serving as raceways are of sufficient arness an possess a suitable surface finis. Harness of HR will ensure tat te full capacity of tese bearings is attaine. Lower arness figures will entail a reuction in te static an ynamic capacities (bot axial an raial) as sown in te tables of imensions (see Tecnical Section). TYPES OF BEARINGS Stanar combine bearings RAX700 RAX400 RAX500 RAXF700 RAXPZ400 RAXZ

3 Tecnical features Types of combine bearings ombine bearings type RAX 700 an RAXF 700 ombine bearings type RAX 700 possess a onepiece outer ring forme from tin seet steel accurately controlle an arene by suitable eat treatment. Te sape of tis outer ring prevents weakness in te area between te axial component an te raial component, even after te latter as been tigtly fitte into a ousing. Tis type of combine bearing is inexpensive an occupies little space, tus proviing a very economical solution. Because tey are easy to use an can be fitte rapily, tey are often employe in preference to an arrangement wit two separate neele bearings. lose-en combine bearings type RAXF 700 ensure perfect sealing at te en of a saft an o not require te use of blin ousings or en caps. Stanar combine bearings type RAX 400 an RAX 500 ombine neele bearings type RAX 400 an RAX 500 comprise a trust plate an an outer ring macine separately an joine by a strong metal insert. Tis arrangement prevents localise stresses an weakness in te area between te two components, tus eliminating te risk of amage uring mounting or operation. Altoug combine bearings type RAX 700 soul be consiere first on grouns of economy, combine bearings wit tick outer ring type RAX 400 or RAX 500 soul be use wen operating conitions require iger limit loas or greater rotational accuracy. Moreover, tey can be supplie in macine-tool quality type RAXN. Bearings Separate trust plates Wit neele trust bearing Wit roller trust bearing Tin outer ring Tick outer ring Tick outer ring open RAX 700 loseen RAXF 700 P tick or tin Witout retaine trust Plate RAX 400 P tick or tin Wit retaine trust plate RAXPZ 400 Witout retaine trust plate RAX 500 P tick or tin Inner rings (1) JR JR JR (1) lnner rings wit oil ole type JR...JS1 on request. Wit retaine trust plate RAXZ 500 Macine-tool quality combine bearings types RAXN 400, RAXN 500, an erivatives Te combine bearings in te RAXN 400 an RAXN 500 are manufacture to te same imensions as te RAX 400 an RAX 500 in iger precision wit respect to out-of- rounness an tickness of te rings an axial run-out of te trust bearing. Tese bearings, wic are also available wit retaine trust plate RAXNPZ 400 an RAXNZ 500, are particularly recoene for use in rilling macine spinles. Wit neele trust bearing Witout trust plate Wit retaine trust plate Wit roller trust bearing Witout trust plate Wit retaine trust plate Bearings RAXN 400 RAXNPZ 400 RAXN 500 RAXNZ 500 Separate trust plates PN PN Stanar combine bearings type RAXPZ 400 an RAXZ 500 Tese bearings ave an incorporate trust plate retaine by a steel ring set on te trust plate. Tey are better protecte against te introuction of ust an metal particles an are terefore recoene for spinles of rilling macines. Inner ring IM IM IM

4 Tecnical features Types of combine bearings TOLERANES OF OMBINE BEARINGS ombine bearings types RAX 700 an RAXF 700 Because types RAX 700 an RAXF 700 ave an outer ring forme from tin seet steel, te raial component of tese bearings can only be inspecte using a ring-gauge aving sufficient tickness to witstan eformation an wit a bore groun wit great accuracy. Te iameters of te ring-gauge an te "GO" an "NO- GO" plug-gauges are ientical to tose given on page 58 in te inspection table for cage neele buses type L aving ientical inner an outer iameters. Tickness tolerance of te axial component 1 : ± 0,1 Stanar combine bearings type RAX 400, RAX 500 an erivatives iameter uner te neeles F w : tolerance F6 (ISO Stanar 1206). Outer iameter Out-of-rounness lnner rings JR Tickness 1 : + 0,05/ - 0,06 Axial run-out max: 0,01 Tolerance Intermal 60 Tin trust plates Normal tolerance class accoring to ISO Stanar 1206 (see table on page 219). Intermal > 60 Tick trust plates Tickness ± 0,030 (1) ± 0,050 (2) ± 0,050 Max axial 0,020 (1) 0,025 (2) 0,005 run-out (1) Uner minimum loa of 150 N - (2) Uner minimum loa of 250 N Macine-tool quality combine bearings types RAXN 400, RAXN 500 an erivatives iameter uner te neeles FW: tolerance F6 (ISO Stanar 1206). ISO Stanar 1206 (see table on page 219). Out-of-rounness: Precision class 5 accoring to ISO Stanar 492 (IN 620) (see table on page 219). lnner rings IM an IM 20600: inner iameter : 0/-0,010 outer iameter F: 0/ -0,005 wit B: 01/ -0,130 up to = 40 0/ -0,160 for > 40 out-of-rounness: Tickness 1 : 0/ -0,012 Axial run-out: 0,005 Tickness : selecte to obtain tolerance 8 on total tickness ( + 1 ) Axial run-out: 0,005. RAIAL PLAY ombine bearings types RAX 700, RAXF 700 Te fit of a combine bearing wit tin outer ring in te ousing etermines, to a large extent, te imension uner te neeles an consequently te raial play uring operation. Te recoene saft an ousing tolerances give a raial play wose limits are suitable tor most normal applications. To obtain a closer clearance, it is possible to matc te saft iameters wit te iameters uner te neeles of te bearings, after te latter ave been fitte into teir ousings. Te possible ifferences in te stiffness of ousings an te variations of clamping force resulting from te tolerance buil up o not permit to establis a range of imensions uner te neeles for every application. However, for ousings of very tick steel, taking into account te probable restraining force, te variations of te imensions uner te neeles after installation will be witin te tolerances given below: + 15/ + 50 μm up to F w / + 60 μm up to F w = 25 a F w = / + 65 μm up to F w = 45 Outer iameter : Normal tolerance class accoring to 158

5 Tecnical features Types of combine bearings Te limits of raial play soul also take into account te tolerance of te saft use irectly as a raceway or of te outer iameter of te inner ring after it as been fitte on to te saft. Were an inner ring is use on a saft of recoene tolerance k5 (or m5), te minimum play may be sligtly lower an te maximum play sligtly iger tan for te case of an assembly witout inner ring on a saft wit tolerance 5. Nominal imension above a 6 a 10 a 18 a 30 a 50 F w to a 10 a 18 a 30 a 50 a 80 Tolerance of iameter uner te neeles F5 μm +13/ / / / /+43 Stanar combine bearings type RAX 400, 500 an erivatives Te raial play of tese bearings wen use witout inner rings is te ifference between te iameter uner te neeles, wic is kept witin tolerance F6, an te iameter of te saft wic is macine to te recoene tolerances. Tis type of combine bearing witout inner ring can be supplie aving a iameter uner te neeles selecte in te lower alf of tolerance F6 (suffix TB) or in te upper alf (suffix T) accoring to te table below. Nominal imension above a 6 a 10 a 18 a 30 a 50 F w to a 10 a 18 a 30 a 50 a 80 Normal F6 μm +13/ / / / /+49 Tolerance of iameter uner te neeles TB μm +13/ / / / /+40 T μm + 17/ / / / /+49 Te raial play prior to installation of stanar combine bearings wit inner ring is in conformance wit te normal group of ISO Stanar Te closely controlle play provie by tis stanar can be provie on request. Macine-tool quality combine bearings types RAXN 400, 500 an erivatives Te raial play prior to installation of macine-tool quality combine bearings results from tolerance F5 on te iameter uner te neeles, possibly in selection TB or T, an tolerances k5 on te iameter of te saft. Te raial play prior to installation of macine-tool quality combine bearings results from tolerance F5 on te iameter uner te neeles an tolerance 0/ on te outer iameter F w of inner ring IM or IM SHAFT AN HOUSING TOLERANES ombine bearings RAX, RAXF 700 RAX, RAXPZ, RAXZ 400 an 500 RAXN, RAXNPZ RAXNZ 400 an 500 Quota Fw per cuscinetti senza anello interno Saft Housing imension for bearings wit inner ring Rotation Oscillation Rotation Oscillation 5 (6) 5 k5 j5 (j6) j5 k5 k5 (k6) k5 k5 m5 (m6) m5 m5 Steel or castiron H6 (H7) K6 K6 imension Non-ferrous metal (1) or tin castings in steel M6 (M7) 1) lf a ousing of non-ferrous metal reaces temperatures consierably iger (or lower) tan 20, account soul be taken of te ifference in expansion (or contraction) of te outer race of te bearing an suitable ajustments to te fits soul be mae. Te cylinrical tolerance efine as te ifference in raii of two coaxial cyliners (ISO Stanar 1101) soul normally be less tan a quarter of te manufacturing tolerance. However, for ig precision or ig spee applications, it is avisable to restrict tis tolerance to te one-eigt of te manufacturing tolerance. M6 M6 159

6 Tecnical features Types of combine bearings SUPPORTING FAES- RAEWAYS Te bearing souler must be a flat face at rigt angles to te ousing axis, oterwise axial precision will be affecte an te smoot running caracteristics of te trust bearing will be iminise. Similarly, te saft souler, on wic te neeles of te trust bearing rotate or on wic te trust plate is supporte, must be flat an square to te axis. Te eviation from true parallelism between te two supporting faces must be no more tan: a combine bearing wit trust plate. a combine bearing witout trust plate. In te case of an assembly were neiter trust plate nor inner ring is use, te saft journal on wic te neele rotate must ave sufficient arness, i.e HR to ensure maximum loa capacities are attaine. lf te saft souler is use irectly as a raceway for te neeles of te trust bearing or, if it supports a tin trust plate (tickness 0.8 or 1.5 ), it must be rigi an continuous trougout te area of circulation of te neeles boune by imensions E b an E a. A tick trust plate can be supporte on a smaller saft souler or on one tat is iscontinuous (as in te case of splines), provie te eflection of te plate oes not affect te smoot running or require accuracy of te trust bearing. TYPIAL ARRANGEMENTS USING OMBINE BEARINGS RAX an RAXF 700: see page 162. RAX 400 (or 500) an RAXPZ 400 (or RAXZ 500): see page 163. RAXN 400 (or 500) an RAXNPZ 400 (or RAXNZ 500): te typical applications for tese macine-tool quality combine bearings use witout inner ring an wit or witout tick trust plate are ientical to tose for te corresponing stanar combine bearings (see page 163). Te special inner rings ( or 20600) esigne for macine-tool quality combine bearings are of sufficient wit to permit centring of te trust plate an tus eliminate te nee for a saft souler. min=ea L-2 Fw (8) INSTALLATION Te bearing must be correctly aligne wit te ousing. lt is wise to use a small press fitte wit a manrel aving a supporting face square to te axis an covering te wole area boune by imensions E b an E a. Tis meto prevents te trust component from unergoing sock loa wic migt amage te bearing. Wen RAX or RAXF 700 bearings are place in position uring installation care must be taken to ensure tat te force exerte by te press oes not excee te axial limit loa sown in te table of imensions. Te fitting of inner rings on safts manufacture to te recoene tolerances is usually sufficient to rener te use of retaining rings unnecessary. However, if it is necessary to employ a ring to support an ajacent pinion, tis ring must ave an outer iameter sligtly smaller tan imension Fw to enable it to pass smootly into te bearing wen te saft is introuce. 160

7 Tecnical features Types of combine bearings LUBRIATION Wen te applie axial loas are relatively ig an te application allows te use of oil as te esire meto of lubrication, bearing types RAX 500 soul be given consieration. ombine bearings wit a ust cap may use oil lubrication, altoug teir esign makes tem better suite for use wit grease lubrication. ombine bearings are typically sippe protecte wit a corrosion preventive compoun tat is not a lubricant. Te bearings may be use in oil or grease lubricate applications, witout removal of te corrosionpreventive compoun. However, it may be avisable to remove te corrosion-preventive compoun before packing te bearings (wit a suitable grease) to obtain optimum grease performance an to minimize te possibility of confusing grease bearings wit bearings containing corrosion preventive. LOA RATINGS alculations for combine bearings are carrie out taking te axial component an te raial component separately witout transforming te axial loa into an equivalent raial loa. For te meaning of te Loa Ratings in te tables of combine bearings RAX 400, RAX 500 an erivatives, see te Tecnical Section. ombine bearings type RAX700 an RAXF700 as a limitation for te maximum axial permissible loa, bot axial an raial, because are mae in tin outer ring. Limit loas are in te table on page

8 Metos of installation for combine bearings RAX an RAXF 700 a a+1 1 Ea min r -2 Fw (1) amfer: 0,5 to 1 up to RAX (or RAXF) 720 0,7 to 1,5 from RAX (or RAXF) 725 RAX RAXF r max Ea min Fw Fw Ea Fw (10) 1 max +-2 B Fw (10) -0.2 max +-2 B 162

9 Metos of installation for combine bearings RAX 400 an 500, RAXPZ 400 an RAXZ 500 a+0.5 min Ea min r: 0.5 max Fw a+0.5 min Ea min Fw a+0.5 min Fw a+0.5 min Ea min Fw (10) B a+0.5 min Fw (10) B a+0.5 min Fw a+0.5 min Fw (10) B 163

10 ombine bearings RAX RAXF 700 a E a E b F w a E a E b L F w Saft RAX 700 esignations RAXF 700 Fw RAX 700 RAXF 700 a Eb Ea 1 L Raial Loa ratings kn Axial yn. Stat. o yn. Stat. o 5 RAX RAX 712 RAXF RAX 714 RAXF RAX 715 RAXF RAX 718 RAXF RAX 720 RAXF RAX 725 RAXF RAX 730 RAXF RAX RAX 740 RAXF RAX

11 1 1 L a E a E b F w a E a E b F w RAX 700 RAXF 700 Limit Loas kn Weigt Inspection Spee Trust plate Saft rating Housing GO pluggaugegauges NO-GO plug- RAX RAXF Inner ring Raial Axial min -1 Kg Kg Tin Tick JR 8x12x12.5 P P JR 10x14x12 P P JR 12x15x12.5 P P JR 15x18x16.5 P P JR 15x20x16 P P JR 20x25x20.5 P P JR 25x30x20.5 P P JR 30x35x20.5 P P JR 35x40x20.5 P P JR 40x45x20.5 P P

12 ombine bearings RAX 400 RAX 500 Macine-tool quality combine bearings RAXN 400, RAXN rs a E a E b F w a E a E b 1 2 r s F w RAX RAXN 400 RAX RAXN 500 Saft RAX 400 esignations RAX 500 Fw RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX RAX a Eb Ea 1 2 rs min 166

13 1 2 rs 1 2 r s a E a E b F w a E a E b F w RAX RAXN 400 RAX RAXN 500 Raial Loa Ratings kn Axial yn. Stat. o yn. Stat. o Spee Rating min -1 Weigt kg Inner ring Tin Trust plate JR 7x10x16 P P JR 7x10x16 P P JR 9x12x16 P P JR 9x12x16 P P JR 12x15x16 P P JR 12x15x16 P P JR 14x17x17 P P JR 14x17x17 P P JR 17x20x20 P P JR 17x20x20 P P JR 20x25x20 P P JR 20x25x20 P P JR 25x30x20 P P JR 25x30x20 P P JR 30x35x20 P P JR 30x35x20 P P JR 35x40x20 P P JR 35x40x20 P P JR 40x45x20 P P JR 40x45x20 P P JR 45x50x25 P P JR 45x50x25 P P JR 55x60x25 P P JR 55x60x25 P P JR 60x70x25 P P JR 60x70x25 P P Tick Saft

14 ombine bearings wit incorporate trust plate RAXPZ 400 RAXZ 500 Macine-tool quality combine bearings RAXNPZ 400, RAXNZ a w F w r s a w 1 2 r s F w RAXPZ400 - RAXNPZ 400 RAXZ RAXNZ 500 Saft RAXPZ 400 esignations RAXZ 500 Fw RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ RAXPZ RAXZ a a 1 2 rs min 168

15 1 2 r s 1 2 r s a w F w a w F w RAXPZ400 - RAXNPZ 400 RAXZ RAXNZ 500 Loa Ratings kn Spee rating min -1 Weigt kg Raial Axial yn. Stat. o yn. Stat. o Saft

16 Trust plates for stanar combine bearings P tin an tick 1 1 P tin P tick Saft P Tin esignations F Tick 1 Weigt g P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P RAX 700 RAXF 700 For combine bearings RAX 400 RAX 500 RAX 410 RAX 510 RAX, RAXF 712 RAX 412 RAX 512 RAX, RAXF 714 RAX, RAXF 715 RAX 415 RAX 515 RAX, RAXF 718 RAX 417 RAX 517 RAX, RAXF 720 RAX 420 RAX 520 RAX, RAXF725 RAX425 RAX 525 RAX, RAXF 730 RAX 430 RAX 530 RAX, RAXF 735 RAX 435 RAX 535 RAX, RAXF 740 RAX 440 RAX 540 RAX, RAXF 745 RAX 445 RAX 545 RAX 450 RAX 550 RAX 460 RAX 560 RAX 470 RAX

17 Inner rings for stanar combine bearings JR stanar B r F JR Saft JR esignations JR F B r Weigt g RAX 700 RAXF 700 For combine bearings RAX 400 RAXPZ 400 RAX 500 RAXZ JR 7x10x RAX 410 RAX JR 8x12x12, RAX JR 9x12x RAX 412 RAX JR 10x14x RAX JR 12x15x12, RAX 715 JR 12x15x RAX 415 RAX JR 15x18x16, RAX JR 14x17x RAX 417 RAX JR 15x RAX 720 JR 17x20x RAX 420 RAX JR 20x25x RAX 425 RAX 525 JR 20x25x20, RAX JR 25x30x RAX 430 RAX 530 JR 25x30x20, RAX JR 30x35x RAX 435 RAX 535 JR 30x35x20, RAX JR 35x40x RAX 440 RAX 540 JR 35x40x20, RAX JR 40x45x RAX 445 RAX 545 JR 40x45x20, RAX JR 45x50x RAX 450 RAX JR 55x60x RAX 460 RAX JR 60x70x RAX 470 RAX

18 Trust plates for macine-tool quality combine bearings PN for RAXN 400 an RAXN On saft entre On inner ring PN Stanar esignations PN PN Supplementary 1 Weigt kg PN PN 2, PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN PN

19 Inner ring for macine-tool quality combine bearings IM an IM for RAXN 400 an RAXN 500 B r F IM Saft IM esignations IM F B Weigt kg IM IM IM IM IM IM IM IM IM IM IM IM IM IM IM IM IM IM

20 Bearing assemblies ombine bearings, trust plates, inner rings macine-tool quality RAXN, RAXNPZ 400, RAXN, RAXNZ 500 a a a a ombine bearings an separate trust plates ombine bearings wit retaine trust plates Inner rings a IM RAXN PN RAXNPZ 420 IM RAXN PN IM RAXN PN IM RAXNZ 520 RAXN PN IM IM RAXN PN RAXNPZ 425 IM RAXN PN IM RAXN PN IM RAXNZ 525 RAXN PN IM IM RAXN PN RAXNPZ 430 IM RAXN PN IM RAXN PN IM RAXNZ 530 RAXN PN IM IM RAXN PN RAXNPZ 435 IM RAXN PN IM RAXN PN IM RAXNZ 535 RAXN PN IM

21 Bearing assemblies ombine bearings, trust plates, inner rings macine-tool quality RAXN, RAXNPZ 400, RAXN, RAXNZ 500 a a a a ombine bearings an separate trust plates ombine bearings wit retaine trust plates Inner rings a IM RAXN PN RAXNPZ 440 IM RAXN PN RAXNZ 540 IM IM RAXN PN RAXNPZ 445 IM RAXN PN RAXNZ 545 IM IM RAXN PN RAXNPZ 450 IM RAXN PN RAXNZ 550 IM IM RAXN PN RAXNPZ 460 IM RAXN PN RAXNZ 560 IM IM RAXN PN RAXNPZ 470 IM RAXN PN RAXNZ 570 IM