CR Seals handbook - SKF

1 CR Seals handbookCR Seals handbookIndustrial shaft sealsDESIGNED FOR REAL LIFE This all-new CR Seals handbook from S F om-bines o r bes ideas and insi h s from he as and he resen e ho e i be omes o r firs and las so r e for informa ion on radial shaf Seals The mos ob io s han e in he handbook s ar s wi h i s i le The CR Seals handbook referen es CR Chi a o Rawhide hro ho o des ribe he S F ind s rial shaf seal offerin Fo nded in as Chi a o Rawhide CR Seals has one of he lon es his ories in he seal ind s r For he las ears CR Seals has been se in er-forman e and ser i e life s andards for ind s rial and a omo i e shaf Seals CR Seals has also been ar of S F sin e a s an d rin whi h we e de elo ed new ma erials man fa rin ro esses and desi ns o rea e some of he mos rob s Seals on he marke This CR Seals handbook in l des a ran e of ra i- al knowled e and insi h s abo e er hin from seal ins alla ion s ora e and handlin o om le seal a li a ion en ineerin and ro bleshoo in on e s Alon wi h seal sele ion ides and f ll rod lis in s b shaf si e his handbook also hi hli h s ke CR Seals es and e hnolo ies in l din S F a e S F Ed e and S F Fle Seals l ima el Seals are a ore S F e hnolo as he on rib e o o r ision of a world of reliable ro a- ion and hel s differen ia e o r osi ion as he ndis ed leader of he bearin ind s r ForewordTable of contents CR Seals handbook is or of CR In rod ion

2 CR Seals differen ia ors Seal en ineerin Seal sele ion Ro ar shaf seal lis in s rod line lis in s A endi Seal re es form SKF sealing history Chi a o Rawhide is fo nded in Chi a o rod s in l de bel in la -in ro es and o her rawhide lea her ar i les Chi a o Rawhide in rod es lea her ears CR lea her rod s firs a eared in he Ford odel T Chi a o Rawhide a en s he erfe Oil Seal made of lea her Chi a o Rawhide be ins sellin i s rod s o re la emen marke s CR a en s he firs a e seal - S F a ires Chi a o Rawhide a ro e h ol seal and E onomos and forms a lobal seal b siness ni wi h o era ions in E ro e Asia and Nor h Ameri a The a isi ions hel es ablish S F as a sealin e hnolo leader for ro ar h dra li and fl id handlin a li a ions A le a of ro en e hnolo a work From rawhide leather to advanced polymersS F sealin e hnolo ies ha e e ol ed from some of he mos s essf l and rob s ind s rial sealin sol ions e er desi ned O r sealin linea e s re hes ba k o he s in he Chi a o s o k ards ha a e rise o Chi a o Rawhide CR In CR a en ed i s firs -e er erfe Oil Seal ade of

3 Rawhide lea her ha seal domina ed a omo i e and ind s rial e i men desi ns in o he s In he s CR in rod ed he S F a e seal li desi n idel re o ni ed as one of he mos rob s s andard seal desi ns e er de elo ed he S F a e li seal has been a work in ro a in e i men in e er ind s r for de ades Toda S F sealin desi n and ma erials on in e o lead he ind s r wi h lobal sealin sol ions like he S F Ed e Seals S SA and S F Fle hea ind s rial Seals all of whi h are made from S F-de elo ed ni rile r bber N R for-m la ions and hi hl en ineered fl orina ed F om o nds SKF Wave seal h S F for Seals Because no one knows how they work with bearings better than a leadin bearin man fa - rer ha also man fa res Seals S F has a ni e ers e - i e on he in er la of he ele-men s in ro a in e i men Thanks o o r ad an ed sealin e hnolo ies desi ns and de el-o men ro esses CR Seals o - erform he om e i ion on he es ben h and in he a li a ion h risk n lanned down ime and hi h warran os s wi h a s b- ar seal Tr s o r ime and o r bo om line o he rob s reliabili of CR Seals from S F Deep seal knowledge.

4 Proprie ar ools and dedi a ed es ing a in s died bearin desi n and er-forman e for o er a en r S F is ni el alified o re ommend he o im m sealin sol ion for a i en a li a ion e e de elo ed a dee nders andin of how em era res s eeds res-s res l bri an s shaf s rfa es and o her ondi ions im a seal life and erforman e This knowled e ba ked b ears of R D in sealin ma erials desi n and ribolo in ind s rial a o-mo i e and aeros a e a li a ions oes in o e er sealin sol ion and re om-menda ion we offer O r in-ho se sim la ion ools in l de he S F Seal Desi ner whi h hel s s e lore he non-linear beha ior of seal-in ma erials o hel redi sealin erforman e nder ario s ondi ions S F en ineers also a l non-linear Fini e Elemen s Anal sis FEA o sim -la e o era in ondi ions b sin dif-feren seal eome ries o iden if he ri i al desi n areas On e a seal and has been desi ned and de elo ed i nder oes an e ensi e series of erforman e rials a one of o r seal es in labs S F o era es a lobal ne work of dedi a ed seal es in fa ili ies ha erform ho sands of anal ses ann all meas rin seal er-forman e fa ors s h as d rabili on aminan e l sion sal fo orro-sion old fra re m ra e hemi al om a ibili and more 34%Fatigue Lubrication36%PoorLubrication14%Contamin ation16%Poor Fitting re a re bearing ail resSeal rela ed ail resSven Wingquist.

5 Inventor of the double-row self-aligning ball bearing he r e os s o a poor seal As he har a ri h shows Seals a o n for s a sli er of o al earbo os s failin Seals are res onsible for mos s omer om lain s ha is nre resen ed b he har is he os l down ime and los b siness ha seal fail res also a se For OE s sele in a hea er seal om onen arries bi risks in erms of s omer sa isfa ion C s omers ha r o sa e a few dollars wi h an inferior seal o ld wind os in hemsel es m h more la er sho ld he seal fail rema rel In ei her ase is he risk of a sin he end- ser so m h hassle and los ro-d i i reall wor h he minimal sa -in s Ins ead ins all onfiden e wi h CR Seals and re ommend he world s mos rob s s andard sealin sol ions n Sealsn Gearin n earin sn a hinin and assembl n o sin n L bri an n Shaf Cos o gear ni par s ar -rela ed o plain sSeal os s s seal-rela ed iss esSeals a o n for s a in fra ion of o al ear ni os s b are res onsible for he ma ori of ar -rela ed fail res CR SealsPrimary seal functionsRo a in shaf s need a bearin arran emen for smoo h effe i e o era ion In rn bearin arran emen s need a sealin sol ion for ro e ion and o a hie e ma im m ser- i e life As i Seals he o enin be ween om onen s a seal-in sol ion m s erform one or more rimar seal f n ions Radial shaft Seals A work in e er ma or ind s r S F radial shaf Seals s - or rea er ime in e er hin from me al mills o wind rbines S a e and S dge or oil appli a ionsThe lassi S F a e Seals fea re li s

6 Molded in a sin soidal wa e a ern on o a ase wi h a me al OD The are known as a r s ed rob s sol ion sed in e er ind s r S F Ed e Seals mee ISO and DIN s andards and fea re a r bber OD s e iall desi ned seal li s and remi m om o nds ha resis hemi al a a k o h S F a e and S F Ed e Seals o erform all om e i ors in heir lassifi a- ion and are one of he mos rob s Seals on he marke Seals or grease appli a ionsFor de ades s omers ha e r s ed o r series rease Seals o di er on amina ion awa from ri i al bearin s Seals are desi ned o wi hs and a rease r e when he li is oin in oward he air side S le Seals or hea ind s rial appli a ionsThis ran e in l des hea -d me -al- ased Seals as well as all r bber Seals S F Fle Seals an be s om made i kl o ir all an shaf and bore si e o er in mm Casse e sealsS F S o Seals for oil a li a ions fea re a m l i-li seal an in e ra ed wear slee e and hi h- erforman e elas omeri ma erials O r ad an ed S F a e li e hnolo is sed for all S F S o Seals Re ain he l bri an Separa e wo di eren edia l de on a inan sSeal nder press re ial shaft Seals Desi ned o seal a iall a ains a o n erfa e er endi lar o he shaf or in a ial shaf Seals from S F in l de hi h erforman e rimar Seals l s os -effe i e -rin Seals -ring Seals -rin Seals from S F offer an eas - o-ins all sol ion for ro a in shaf a li a ions in l din se as a se ondar seal in hi hl on amina ed en ironmen s e al a ed Seals Ori inall desi ned for he low s eeds and se ere ondi ions ha affe off-road and ra

7 Ked ehi les S F me al fa e Seals ha e ro en e all s i able for a li a ions e osed o sand soil m d wa er and more ial e l der Seals The CT a ial seal is a s li seal ha an be lam ed o a ho sin The sealin li r ns on a ro a in fa e and e l des on aminan s The an be o an si e from in mm o o er in mm ear sleeves O er ime ar i les ra ed ndernea h a shaf sealin li form wear roo es on he shaf leadin o seal fail re and shaf dama e S F wear slee es an hel re en he rob-lem or orre i wi ho re-ma hinin he shaf S Speedi-Slee e S andard and oldS F S eedi-Slee e is a hin-walled shaf slee e o in mm ha is ressed in o osi ion o er he shaf o ro ide an e ellen seal-in s rfa e one ha is s erior o wha an i all be a hie ed on a shaf DS ear slee es Desi ned for hea ind s rial a li a- ions LDSL wear slee es a ommo-da e shaf dimensions o er in mm and are sed on ori inal e i men or o re air he sealin s rfa e of worn or dama ed shaf s CR Seals differen ia ors Rotary oil Seals must pump to protectTo kee on aminan s and mois- re from dama in a bearin or shaf a ro ar shaf seal m s form a barrier be ween he oil s l and he o side en iron-men o erform as effe - i el as ossible a seal m s also be able o m oil awa from he air side and oward he oil side This m ra e de ends on he seal li desi n and seal li ma erial and CR Seals is a lobal leader in m ra e ow p p ra e works As fig re indi a es he a roa h an le from he oil side of he seal li is s ee er han he air side

8 This differen e rea es a on a ress re r e biased oward he oil side whi h affe s he mana emen of he hin film of oil be ween he li and he shaf hen he shaf is in mo ion i wears s rfa e fea- res on o he r bber in a s e ifi a ern These s rfa e fea res or as eri ies beha e m h like he skin on he ba k of o r hand ndis rbed he ores and wrinkles on o r hand are fairl niform and ndis or ed la e a fin er on o r skin and he ores and wrin-kles nearb will s re h as a rea ion o he shear s ress and orien hemsel es oward he dire ion of he for es Similarl as a shaf ro a es and wears he seal li he s rfa e as eri ies nder he seal li will form in o a a ern ha orrela es wi h he ress re r e ind ed b he seal li This deforma ion is biased oward he oil side s like he ress re r e from he li As he arrows in fig re indi a e he ro a ion of he shaf ind es a h drod -nami m in me hanism ha hel s ad a en fl id mole les flow ba k oward he oil side a a s r risin ra e There are o her wa s o in rease he m ra e of a seal in l din addin h drod nami fea res like he S F a e or a heli al a ern on he li ig ig Oil sideAir sideAir sideOil sideSeal li Ro a in shaf Oil sideAir side ndistorted seal li surfa e stru ture at rest otational fri tion distorts seal li surfa e, reating torsional shear stress and forming a attern of surfa e features all as erities verall effe t of this att