Bearings for Mining Machinery

Transcription

1 eaings fo Mining Machiney Tough beaings offe longe sevice life unde demanding mining conditions though NSK s wealth of outstanding technologies. Choose NSK

2 NSK beaings offe mine opeatos longe sevice life unde the most challenging opeating conditions to maximize uptime and educe maintenance costs fo impoved poductivity at mining sites. Duability and eliability ae of paamount impotance fo mining machiney opeating in emote locations such as mountains and desets, whee failue of a single component can impact the entie mining opeation. NSK has applied state-of-the-at technology to exceed the life and limiting speed of conventional beaings. Ou supeio beaings offe highe limiting speed and longe opeating life, theeby educing maintenance costs fo mine opeatos. 1 2

3 NSK beaings suppot mining machiney fo the challenging task of aising efficiency and poductivity of opeations unde hash envionments. CA seies beaings ae double-ow self-aligning spheical olle beaings with a machined bass cage that have a high load capacity, supeio duability, and ae esistant to wea. The CA seies ae especially suitable fo applications that opeate unde heavy o shock load conditions. CA Seies Spheical Rolle eaings CA-VS seies beaings ae CA seies beaings that have been optimized fo hash vibating applications, including vibating sceens and feedes. CA-VS Seies Spheical Rolle eaings Jaw Cushe Wok mateial is cushed between two opposing jaw plates. One plate opens and shuts, cushing aw mateial against the stationay jaw plate. Cone Cushe Mateial is fed into the cushe cavity and pocessed by the eccentic otating action of the inne cone against the oute cone. Wok can be educed to a diamete anging fom 50 mm to 100 mm. Vibating Sceen The vibating sceen consists of a case with a shaft and housing installed inside, with spings suppoting the case. The swing and otation of the shaft is poduced by the attached unbalanced weight, which geneates vibation. This vibation sifts the mateial set on the sceen on the top of the case. Impact Cushe As indicated by its name, this machine cushes oe though impact, and steadily educes the size of the cushed paticles though shap, epeated impact with a apidly spinning hamme, steel plate, o stick. NSKHPS seies beaings ae double-ow self-aligning spheical olle beaings capable of caying heavy adial loads with modeate axial loads in eithe diection. The spheical pofile of the olles, the inne ing aceway, and the oute ing aceway, enable a self-aligning function that allows full capacity loading. The NSKHPS seies offes high pefomance standad-size beaings with longe opeating life and highe limiting speeds than conventional beaings. NSKHPS Spheical Rolle eaings Field & Application Infomation Supeio eaings fo the Mining Industy NSK R&D Capabilities A Poduct Line that Matches Specific Applications EM and EW seies beaings ae cylindical olle beaings capable of caying paticulaly lage adial loads and ae suitable fo highspeed applications. The EW seies featues a pessed steel cage and the EM seies featues a one-piece machined bass cage. oth cages offe high-load capacity fo standad-size beaings, in addition to excellent functionality and longe opeating life. EW/EM Seies Cylindical Rolle eaings Fou Coe Technologies Japan Copoate R&D Cente Hi-TF beaings wee developed with innovative mateials and heat teatment technology fo inceased duability unde hash conditions. They combine long sevice life with good esistance to wea and seizue even unde contaminated lubication to achieve outstanding cost pefomance. Hi-TF eaings Full-complement double-ow cylindical olle beaings featuing a thin-section pofile and boad width specially designed fo cane ope sheaves. Othe applications include machiney opeated at low-speed unde a high load. These non-sepaable beaings can withstand heavy shock loads and moment loads, and have sufficient axial load capacity fo use in sheaves. Full-Complement Cylindical Rolle eaings fo Sheaves Tibology Mateial Engineeing Mechatonics eaing poducts supplied to the maket by NSK embody advances in the field of tibology the science of lubication, including enhanced gease fomulations and solid lubicants, and the impovement of suface-pocessing methods fo meeting the demands fo high-speed pefomance, quiet otation, the capability to sustain heavy loads and duability. NSK must always econcile the demands of poduct functionality and duability with those of cost and poductivity. To this end, mateial design, heat teatment pocessing, and analytical evaluation ae eflected in NSK beaing poducts. Mechatonics is based on the fusion of mechanical elements and electonics. It is a field of advanced technologies that include high-pefomance sensing technology, mounting technology fo applications equiing high tempeatues, high densities, and high eliability, which ae also eflected in NSK beaing poducts. Analysis Technology Optimum designs fo beaing poducts ae developed using advanced analysis technology by making full use of compute simulations though cutting-edge 3D inteactive gaphical vitual envionments. Plumme blocks ae beaing housings that povide high igidity and sealing capability fo lage machiney and heavy load applications. Plumme blocks ae available in a wide ange of types and models fo vaious applications. The two global-standad types of plumme blocks, N and SD, ae available fom NSK fo lage-scale heavy-load applications. Plumme locks 3 4

4 Supe Long-Life Spheical Rolle eaings fo Vibating Equipment CA-VS3, CA-VS4 Seies The CA-VS3 seies and CA-VS4 seies with machined bass cages boast enhanced pefomance by inheiting featues of the conventional CA-VS seies of spheical olle beaing and by adopting the advanced technologies of NSK s high-pefomance poducts. New Featues Featues Highly esistant to heavy o shock loads. Long sevice life fo vibating applications. eaings ae expected to educe maintenance costs and enhance pefomance fo a vaiety of equipment. NSKHPS spheical olle beaings satisfy these equiements by fully utilizing NSK s expeience and expetise to delive longe life and highe limiting speed. Featues Compaed to the conventional EA Seies: Oute Ring High-tempeatue opeability (dimensional stability) and lubication goove and holes Cage Flange High limiting speed Rolles Inceased size and numbe Cage High-stength pessed steel with special suface teatment Excellent self-aligning ability. Peventive measue against shaft deflection. Full Complement Cylindical Rolle eaings fo Cane Sheaves This cylindical olle beaing incopoates seals to pevent the enty of foeign matte. Featues Compaed to the conventional CA-VS seies : eaing life Maximum 2 times eaing life Maximum 2 times o Twofold Inceased dynamic load ating to maximum of 25% Inne Ring High-tempeatue opeability (dimensional stability) Impoved seal: Contact seal inceases esistance to enty of foeign matte o wate. High load capacity: Lage adial load and axial load capacity compaed to conventional sheave beaings. Coosion esistance: Phosphate suface teatment impoves esistance to ust. Easie gease eplenishment: Sealed beaing includes inne ing holes to facilitate gease eplenishment. Fewe mounted components: With snap ings fo the oute ing, fewe components ae equied aound the beaing, making fo a moe cost-effective sheave. Dynamic load ating Maximum 25% highe Easy to install CA-VS3 (4) seies beaings ae available with inne ing boe dimensions anging fom 40 mm to 190 mm NSKHPS Spheical Rolle eaings Limiting speed Maximum 20% highe NSKHPS beaings ae available with inne boe dimensions anging fom 40 mm to 130 mm Catalog No. E1259 Catalog No. E1206 Hi-TF eaings eaings manufactued fom NSK s Hi-TF mateial have been specifically designed fo outstanding toughness unde hash opeating conditions, supassing even NSK s ealie TF beaings. Hi-TF beaings incopoating this new mateial and a new heat-teatment technology povide long sevice life unde contaminated lubication conditions with supeio esistance to wea, seizue, and heat. Hi-TF beaings ae capable of handling the foeseeable needs of the futue as well as meeting today s equiements. eaing life atio EW/EM Seies Cylindical Rolle eaings The EW and EM seies of high-load capacity, standad-size cylindical olle beaings delive outstanding pefomance acoss a wide ange of applications. High-load capacity is achieved by using moe olles than conventional beaings based on an innovative NSK concept. We also offe standad-size cylindical olle beaings fo today s needs that povide longe sevice life and low-noise and low-vibation pefomance though an optimally designed one-piece cage with high igidity and low wea. This cage featue is incopoated in the EW seies as a pessed steel cage and in the EM seies as a one-piece machined bass cage. EW Seies (pessed cage) Seies offes beaing inne boe dimensions anging fom 25 mm to 65 mm Featues Hi-TF Compaed to the NSK s conventional type: Appoximately twice the beaing life 30% to 40% less noise and vibations Cage stength inceased 1.5 to 2 times 10% to 25% highe limiting speed Achieves longe beaing life even unde hash conditions with excellent esistance to wea, seizue, and heat eaing life compaison TF Opeating life unde hash lubication conditions Rolle cage guide face Catalog No. E1238 Cabuized steel beaing Geneal steel beaing Pesent catalog life Cumulative failue pobability, % EM Seies (machined cage) Compaed to the NSK s conventional type: Appoximately twice the beaing life 50% to 60% less noise and vibations Enhanced cage stength Seies offes beaing inne boe dimensions anging fom 25 mm to 200 mm High pecision cage Advantages of a olle-guided cage Touble-fee packing of gease Impoved oil flow Geate accuacy of the olle guidance achieved though special pocket pofiling Lage pocket cone adii elieve stess concentations on the cage eaing life unde bounday-lubication conditions Catalog No. E1237 Test conditions Pmax = MPa Oil bath, = 0.3 n = min 1 Hi-TF Cabuized steel beaing SUJ Numbe of epetition of stess, cycles Catalog No. E Featues Featues

5 Supe Long-Life Spheical Rolle eaings fo Vibating Equipment CA-VS3, CA-VS4 Seies Example CAM E4 -VS3 eaing seies symbols (eaing type+width seies+diamete seies) eaing boe (oe numbe) Cage type symbol CAM: High load capacity machined bass cage eaings fo vibating equipment Special accuacy fo vibating equipment Special intenal cleaance fo vibating equipment Oute ing with oil goove and oil hole (Extenal featues symbol) D d Dimensional toleance and adial cleaance NSK s -VS3, VS4 specifications stabilize the load distibution by contolling the intenal cleaance and the dimensional toleance of the beaing. VS3,VS4 seies has succeeded to U15 specification (special toleance fo vibating equipment) that has been adopted to spheical olle beaing CA-VS seies. Howeve to claify the simplification of the suffix and the diffeence between new seies and conventional seies, suffix U15 is omitted. Numbe symbols (3 and 4) of VS3 and VS4 mean beaing intenal cleaance C3U15 and C4U15 The dimensional toleance beaing is set at 1/2 elative to the oute diamete toleance and the intenal diamete toleance. The adial intenal cleaance is set at 2/3 elative to the standad. eaing numbes Nominal (mm) oe diamete Toleance (µm) Nominal (mm) Outside diamete Toleance (µm) Radial cleaance (Cylindical boe) VS3 (µm) VS4 (µm) 50 to to to to to to to to to to to to to to to to to to to to 340 Dimension table oe diamete d ounday dimensions (mm) asic load atings (kn) Limiting speeds (min -1 ) Outside diamete D Width Chamfe dimension (min.) C C 0 Gease Oil CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS3 eaing numbes 22308CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS CAME4-VS4 C W d 0H Dimensions of oil gooves and holes Nominal oute ing width C ove incl. Oil goove width W Unit: mm Hole diamete d 0H

6 NSKHPS Spheical Rolle eaings φd φ d φd φd φ φ Da a a da Dynamic equivalent load P=XF +YF a F a /F e F a /F >e X Y X Y 1 Y Y 2 Static equivalent load P 0 =F +Y 0 F a The values fo e, Y 2, Y 3 and Y 0 ae given in the table below. Table 1 Dimensions of oil gooves and holes Unit: mm Nominal oute ing width C ove incl Oil goove width W Hole diamete d 0H C W d0h Table 2 Numbe of oil holes Nominal oute ing diamete (mm) ove incl Numbe of holes Cylindical boe Tapeed boe ounday dimensions (mm) asic load atings (N) Limiting speeds (min -1 ) eaing numbes d D (min.) C C 0 Gease Oil Cylindical boe Tapeed boe ( 1 ) EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE EAE EAKE4 Abutment and fillet dimensions (mm) Constant Axial load factos Mass d a D a a (kg) (min.) (max.) (max.) (min.) (max.) e Y2 Y 3 Y 0 appox Note ( 1 ) The suffix K indicates that the beaing has a tapeed boe (tape 1:12). Remaks 1. The maximum opeating tempeatue of standad NSKHPS spheical olle beaings is 200 C. 2. The suffix E4 indicates that the beaing has an oil goove and holes. (The numbes and dimensions of oil gooves and holes ae shown in Tables 1 and 2.) 9 10

7 EW Cylindical Rolle eaings a a b D d F w F w F w D a d b d b d c D a d b d d NU NJ NUP ounday dimensions (mm) asic load atings (N) Limiting speeds (min -1 ) 1 d D (min.) (min.) F w C C 0 Gease Oil eaing numbes Abutment and fillet dimensions (mm) Pemissible axial d NU NJ NUP a d b d c d d D a a b movement S (min.) (min.) (max.) (min.) (min.) (max.) (max.) (max.) (mm) NU205EW NJ NUP NU305EW NJ NUP NU206EW NJ NUP NU306EW NJ NUP NU207EW NJ NUP NU307EW NJ NUP NU208EW NJ NUP NU308EW NJ NUP NU209EW NJ NUP NU309EW NJ NUP NU210EW NJ NUP NU310EW NJ NUP NU211EW NJ NUP NU311EW NJ NUP NU212EW NJ NUP NU213EW NJ NUP

8 EM Cylindical Rolle eaings a a b D d F w F w F w D a d b d b d c D a d b d a d d NU NJ NUP ounday dimensions (mm) asic load atings (N) Limiting speeds (min -1 ) 1 d D min. min. F w C C o Gease Oil eaing numbes Abutment and fillet dimensions (mm) Pemissible NU NJ NUP axial d a d b d c d d D a a b movement S min. min. max. min. min. max. max. max. (mm) NU205EM NJ NUP NU305EM NJ NUP NU206EM NJ NUP NU306EM NJ NUP NU207EM NJ NUP NU307EM NJ NUP NU208EM NJ NUP NU308EM NJ NUP NU209EM NJ NUP NU309EM NJ NUP NU210EM NJ NUP NU310EM NJ NUP NU211EM NJ NUP NU311EM NJ NUP NU212EM NJ NUP NU312EM NJ NUP NU213EM NJ NUP NU313EM NJ NUP NU214EM NJ NUP NU314EM NJ NUP NU215EM NJ NUP NU315EM NJ NUP NU216EM NJ NUP NU316EM NJ NUP NU217EM NJ NUP NU317EM NJ NUP NU218EM NJ NUP NU318EM NJ NUP NU219EM NJ NUP NU319EM NJ NUP NU220EM NJ NUP NU320EM NJ NUP NU221EM NJ NUP NU321EM NJ NUP NU222EM NJ NUP NU2222EM NJ NUP NU322EM NJ NUP The following ae also available: 1. N and NF type beaings 2. Cages with an outside diamete of less than 650 mm (Please contact NSK fo details.) 14

9 EM Cylindical Rolle eaings a a b D d F w F w F w D a d b d b d c D a d b d a d d NU NJ NUP ounday dimensions (mm) asic load atings (N) Limiting speeds (min -1 ) 1 d D min. min. F w C C o Gease Oil The following ae also available: 1. N and NF type beaings 2. Cages with an outside diamete of less than 650 mm (Please contact NSK fo details.) eaing numbes Abutment and fillet dimensions (mm) Pemissible NU NJ NUP axial d a d b d c d d D a a b movement S min. min. max. min. min. max. max. max. (mm) NU224EM NJ NUP NU2224EM NJ NUP NU324EM NJ NUP NU2324EM NJ NUP NU226EM NJ NUP NU2226EM NJ NUP NU326EM NJ NUP NU2326EM NJ NUP NU228EM NJ NUP NU2228EM NJ NUP NU328EM NJ NUP NU2328EM NJ NUP NU230EM NJ NUP NU2230EM NJ NUP NU330EM NJ NUP NU2330EM NJ NUP NU232EM NJ NUP NU2232EM NJ NUP NU332EM NJ NUP NU2332EM NJ NUP NU234EM NJ NUP NU2234EM NJ NUP NU334EM NJ NUP NU2334EM NJ NUP NU236EM NJ NUP NU2236EM NJ NUP NU336EM NJ NUP NU2336EM NJ NUP NU238EM NJ NUP NU2238EM NJ NUP NU338EM NJ NUP NU2338EM NJ NUP NU240EM NJ NUP NU2240EM NJ NUP NU340EM NJ NUP NU2340EM NJ NUP

10 Full-Complement Cylindical Rolle eaings fo Cane Sheaves Recommended fitting and beaing intenal cleaance 30 C S +0.4 C1 0 f CX D d D 2 Dx da 4-d0H When a cane sheave and wheel ae used with an oute ing otating load, beaing fitting and adial intenal cleaance ae as follows: Oute ing otating Load conditions Heavy load with thin housing Nomal load o heavy load Light load o fluctuating load Toleance ange class of shaft g6 o h6 g6 o h6 g6 o h6 Toleance ange class of housing P7 N7 M7 Recommended intenal cleaance C3 C3 CN Handling pecautions e sue to push on the end face of the oute ing when mounting the beaing into a sheave. When mounting the beaing on a shaft, push on the end face of the inne ing. ounday dimensions (mm) asic load atings (N) Snap ing dimensions (mm) Oil hole (mm) Abutment dimensions (mm) Mass (kg) eaing numbes d D C C x (min.) (min.) C C 0 C 1 S D 2 f d 0H d a (min.) D x (min.) appox. RS-5008DSNR RS-5009DSNR RS-5010DSNR RS-5011DSNR RS-5012DSNR RS-5013DSNR RS-5014DSNR RS-5015DSNR RS-5016DSNR RS-5017DSNR RS-5018DSNR RS-5019DSNR RS-5020DSNR Note 1. eaings No. DS indicates seal is included. 2. Shield type can be povided upon equest. Please contact NSK fo details. 3. Fo specification highe than RS-5022, please contact NSK. 4. Gease is factoy-packed into the beaing. NSK ecommends lithium gease fo eplenishing. 5. eaing without snap ing goove, o without snap ings ae also available upon equest. 6. Seal is made of nitile ubbe. The uppe limit of opeating tempeatue is 100 C

11 Radial Cleaance in Spheical Rolle eaings with Tapeed oes eaing Maintenance and Inspection eaings with tapeed boes ae diectly mounted onto tapeed shafts o onto cylindical shafts with adaptes o withdawal sleeves (Fig. 1). Lage beaings ae often mounted using hydaulic pessue. Fig. 2 shows a beaing mounting utilizing a sleeve and hydaulic nut. Anothe mounting method is to dill holes in the sleeve which ae used to feed oil unde pessue to seat the beaing. As the beaing expands adially, the sleeve is inseted axially with adjusting bolts. The beaing should be mounted with a suitable intefeence fit by checking esidual cleaance while measuing thei adialcleaance eduction and efeing to the amount of axial movement listed in Table 1. Radial cleaance must be measued using cleaance Fig. 1 Mounting with adapte Oil Fig. 2 Mounting with hydaulic nut c Fig. 3 Cleaance measuement of spheical olle beaing c gauges. As shown in Fig 3, adial cleaance fo both ows of olles must be measued simultaneously, and those two values should be kept oughly the same. When a lage beaing is mounted on a shaft, the oute ing may be defomed into an oval shape by its own weight. If adial cleaance is measued at the lowest pat of the defomed beaing, the measued value may be geate than the tue value. If an incoect adial intenal cleaance is obtained in this manne and the value in Table 1 ae used, then the intefeence fit may become too tight and the tue esidual cleaance may become too small. In this case, as shown in Fig. 4, one half of the total cleaance at points a and b (which ae on a hoizontal line passing though the beaing cente) and c (which is the lowest position of the beaing) may be used as the esidual cleaance. c Fig. 4 Measuing cleaance in lage spheical olle beaing c Maintenance eaings and opeating conditions must be peiodically inspected and maintained to maximize beaing life to pevent mechanical failue, ensue eliable opeation, aise poductivity, and enhance cost pefomance. Maintenance should be pefomed egulaly accoding to wok standads that may vay accoding to machine opeating conditions. Opeating conditions should be monitoed, lubicant eplenished o changed, and the machine peiodically disassembled and ovehauled. 1. Inspection unde opeating conditions Review lubicant popeties, check opeating tempeatues, and inspect fo any vibations and beaing noise to detemine beaing eplacement peiods and eplenishment intevals of the lubicant. 2. Inspection of the beaing e sue to thooughly examine the beaings duing peiodic machine inspections and pat eplacement. Check the aceway fo any damage and confim if the beaing can be eused o should be eplaced. Table 1 eaing iegulaity causes and measues Inspection points Items to be checked while the machine is unning should include beaing noise, vibations, tempeatue, and lubicant condition. 1. eaing noise Sound detection instuments can be used duing opeation to ascetain the volume and chaacteistics of beaing otation noise though sound pattens that ae eadily distinguishable, which can eveal the pesence of beaing damage such as slight flaking. Thee typical noise conditions ae descibed in Table eaing vibation eaing iegulaities can be analyzed by pefoming a quantitative analysis of vibation amplitude and fequency using a fequency spectum analyze. Measued data vaies depending on the opeating conditions of the beaing and the location of the vibation pick-up. Theefoe, this method equies the detemination of evaluation standads fo each measued machine. Iegulaities Possible causes Measues Loud metallic sound Abnomal load Incoect mounting Insufficient o impope lubicant Impove the fit, intenal cleaance, peload, o position of housing shoulde. Impove machining accuacy, alignment accuacy o mounting accuacy of shaft and housing, o use the coect mounting method. Replenish the lubicant o select anothe lubicant. Table 1 Radial Cleaance in Spheical Rolle eaings with Tapeed oes (Unit: mm) eaing boe diamete Reduction in Minimum pemissible Cleaance in beaings with tapeed boes Axial movement d adical cleaance esidual cleaance CN C3 C4 Tape 1:12 Tape 1:30 CN C3 C4 ove incl. min. max. min. max. min. max. min. max. min. max. min. max Noise Loud egula sound Iegula sound Contact of otating pats Flaws, coosion, o scatches on aceways caused by foeign paticles inelling Flaking on aceway Excessive cleaance Contamination by foeign paticles Flaws o flaking on balls Excessively small cleaance Excessive amount of lubicant Insufficient o impope lubicant Modify the labyinth seal. Replace o clean the beaing, impove sealing conditions, o use clean lubicant. Replace the beaing and use cae when handling. Replace the beaing. Impove the fit, cleaance, o peload. Replace o clean the beaing, impove the seals, and use clean lubicant. Replace the beaing. Impove the fit, cleaance, o peload. Reduce amount of lubicant and select stiffe gease. Replenish lubicant o select a pope one. Abnomal tempeatue ise Abnomal load Incoect mounting Ceep on fitted suface, o excessive seal fiction inelling Impove the fit, intenal cleaance, peload, o position of housing shoulde. Impove machining accuacy, alignment accuacy o mounting accuacy of shaft and housing, o use the coect mounting method. Coect the seals, eplace the beaing, and coect the fitting o mounting. Replace the beaing, and use cae when handling beaings. Vibation (Axial unout) Leakage o discoloation of lubicant Flaking Incoect mounting Penetation of foeign paticles Too much lubicant, o contamination by foeign paticles o wea debis Replace the beaing. Coect the squaeness between the shaft and housing shoulde o side of space. Replace o clean the beaing components and impove sealing. Reduce the amount of lubicant. Select a stiffe gease. Replace the beaing o lubicant. Clean the housing and adjacent pats

12 eaing Damage and Measues Flaking Cacks Damage condition Possible causes Measues Damage condition Possible causes Measues Flaking occus when fagments of beaing mateial chip off fom the smooth suface of the aceway o olling elements due to olling fatigue, theeby ceating egions having ough and coase textue. Excessive load Incoect mounting (misalignment) Moment load Enty of foeign matte, wate penetation Poo lubication, impope lubicant Unsuitable beaing cleaance Impope pecision fo shaft o housing, unevenness in housing igidity, lage shaft bending Pogession fom ust, coosion pits, smeaing, dens (binelling) Reconfim the beaing application and check the load conditions Impove the mounting method Impove the sealing mechanism, pevent ust duing non-unning Use a lubicant with a pope viscosity, impove the lubication method Check the pecision of shaft and housing Check the beaing intenal cleaance Cacks in the aceway ing and olling elements. Continued use unde this condition leads to lage cacks o factues. Excessive intefeence Excessive load, shock load Pogession of flaking Heat geneation and fetting caused by contact between mounting pats and aceway ing Heat geneation due to ceep Impope tape angle of tapeed shaft Impope cylindicality of shaft Intefeence with beaing chamfe due to a shaft cone adius that is lage than beaing chamfe dimension Coect the intefeence Check the load conditions Impove the mounting method Use an appopiate shaft shape Pat: Inne ing of an angula contact ball beaing Symptom: Flaking occus aound half of the cicumfeence of the aceway suface Cause: Incoect lubication due to enty of cutting coolant into beaing Pat: Inne ing of an angula contact ball beaing Symptom: Flaking occus diagonally along aceway Cause: Impope alignment between shaft and housing duing mounting Pat: Oute ing of a double-ow cylindical olle beaing Symptom: Themal cacks occu on the oute ing side face Cause: Abnomal heat geneation due to contact sliding between mating pat and face of oute ing Pat: Inne ing of a spheical olle beaing Symptom: Axial cacks occu on aceway suface Cause: Lage fitting stess due to tempeatue diffeence between shaft and inne ing Pat: Inne ing of a spheical olle beaing Symptom: Flaking of only one aceway ove its entie cicumfeence Cause: Excessive axial load Pat: Inne ing of a spheical olle beaing Symptom: Flaking of only one ow of aceway Cause: Incoect lubication Pat: Coss section of a factued inne ing in a spheical olle beaing Symptom: Oigin is diectly beneath the aceway suface Pat: Rolle of a spheical olle beaing Symptom: Axial cacks occus on olling suface 21 22

13 eaing Damage and Measues Smeaing Seizue Damage condition Possible causes Measues Damage condition Possible causes Measues Smeaing is suface damage which occus fom a collection of small seizues between beaing components caused by oil film uptue and/o sliding. Suface oughening occus along with melting. High speed and light load Sudden acceleation/deceleation Impope lubicant Enty of wate Impove the peload Impove the beaing cleaance Use a lubicant with good oil film fomation ability Impove the lubication method Impove the sealing mechanism When sudden oveheating occus duing otation, the beaing becomes discoloed, and the aceway ings, olling elements, and cage soften, melt, and defom as damage accumulates. Incoect lubication Excessive load (excessive peload) Excessive otational speed Excessively small intenal cleaance Enty of wate and foeign matte Poo pecision of shaft and housing, excessive shaft bending Investigate the lubicant and lubication method Reinvestigate the suitability of the beaing type selected Investigate the peload, beaing cleaance, and fitting Impove the sealing mechanism Check the pecision of the shaft and housing Impove the mounting method Pat: Inne ing of a spheical olle beaing Pat: Convex olles of a spheical olle beaing Pat: Inne ing of a cylindical olle beaing Symptom: Smeaing occus cicumfeentially on aceway suface Cause: Rolle slipping due to excessive gease filling Pat: Oute ing of a cylindical olle beaing Symptom: Smeaing occus cicumfeentially on aceway suface Cause: Rolle slipping due to excessive gease filling Symptom: Discoloation and melting of aceway; won paticles fom the cage wee olled and attached to the aceway Cause: Insufficient lubication Symptom: Discoloation and melting of olle olling suface, adhesion of abasion fagments fom cage Cause: Insufficient lubication Fetting Damage condition Wea occus due to epeated sliding between two sufaces (boe, shaft, olle, etc.) Fetting occus at fitting suface and also at contact aeas between aceway and olling elements. Fetting coosion is anothe tem used to descibe the eddish bown o black wea debis. Possible causes Incoect lubication Vibation with a small amplitude Insufficient intefeence Measues Use a pope lubicant Apply peload Check the intefeence fit Apply a film of lubicant to the fitting suface Pat: Inne ing of a spheical olle beaing Symptom: Patial smeaing occus cicumfeentially on aceway suface Cause: Incoect lubication Pat: Convex olles of a spheical olle beaing Symptom: Smeaing occus at the cente of the olling suface Cause: Incoect lubication Pat: Inne ing of a deep goove ball beaing Symptom: Fetting occus on the boe suface Cause: Vibation Pat: Inne ing of an angula contact ball beaing Symptom: Notable fetting occus ove entie cicumfeence of boe suface Cause: Insufficient intefeence fit 23 24

14 eaing Damage and Measues Wea Ceep Damage condition Possible causes Measues Damage Condition Possible causes Measues Wea is suface deteioation due to sliding fiction at the suface of the aceway, olling elements, olle end faces, ib face, cage pockets, etc. Enty of foeign matte Pogession fom ust and electical coosion Incoect lubication Sliding due to iegula motion of olling elements Impove the sealing mechanism Clean the housing Filte the lubication oil thooughly Check the lubicant and lubication method Pevent misalignment Ceep is a phenomenon in beaings whee elative slipping occus at the fitting sufaces and theeby ceates a cleaance at the fitting suface. Ceep causes a shiny appeaance, occasionally with scoing o wea. Insufficient intefeence o loose fit Insufficient sleeve tightening Check the intefeence, and pevent otation Coect the sleeve tightening Investigate the shaft and housing pecision Peload in the axial diection Pevent axial movement of ing Apply adhesive to the fitting suface Apply a film of lubicant to the fitting suface Pat: Inne ing of a cylindical olle beaing Pat: Oute ing of a spheical olle beaing Pat: Inne ing of a spheical olle beaing Pat: Oute ing of a spheical olle beaing Symptom: Many pits occus due to electical coosion; wave-shaped wea on aceway suface Cause: Electical coosion Symptom: Wea having a wavy o concave-and-convex textue on loaded side of aceway suface Cause: Enty of foeign matte unde epeated vibation while stationay Symptom: Ceep accompanied by scoing of boe suface Cause: Insufficient intefeence Symptom: Ceep occus ove entie cicumfeence of outside suface Cause: Loose fit between oute ing and housing Refeence catalog Please efe to the following catalogs fo details of each poduct. Pat: Inne ing of a double-ow tapeed olle beaing Symptom: Fetting wea of aceway and stepped wea on the ib face Cause: Fetting pogession due to excessive load while stationay Pat: Tapeed olles of a double-ow tapeed olle beaing Symptom: Stepped wea on the olle end face Cause: Fetting pogession due to excessive load while stationay NSKHPS Spheical Rolle eaings (CAT. No. E1259) Cylindical Rolle eaings EW Seies (CAT. No. E1238) Cylindical Rolle eaings EM Seies (CAT. No. E1237) Lage Hi-TF eaings (CAT. No. E1202) Full Complement Cylindical Rolle eaings fo Cane Sheaves (CAT. No. E1206) Rolling eaings (CAT. No. E1102) Lage-Size Rolling eaings (CAT. No. E125) Needle Rolle eaings (CAT. No. E1419) Handling Instuctions fo eaings (CAT. No. E9010) Handling Instuctions fo Spheical Rolle eaings (CAT. No. E9003) New eaing Docto (CAT. No. E7005) 25 26

15 CAT. No. E1265a 2011 C-8 Pinted in Japan NSK Ltd. 2005