Tiêu chuẩn iso 14728 1 2017

© ISO 2017 Rolling bearings — Linear motion rolling bearings — Part 1 Dynamic load ratings and rating life Roulements — Roulements à mouvement linéaire — Partie 1 Charges dynamiques de base et durée n[.]

Rol ing bearing s — Linear motion

Part 1:

Roulement — Roulement à mo vement liné ire —

Partie 1: Ch rges dy amique s de b se et durée n minale

S con edition

2 17-0

COPYRIGHT PROTECTED DOCUMENT

© ISO 2017, P blshed in Sw itz rlan

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written permis ion Permis ion c n be req esed from either ISO at the ad r es below or ISO’s member bod y in the c u try of

F reword i v

Introduction v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 1

4 Symbols 7

5 Basic dynamic load rating s 8

5.1 Linear b l bearing s 8

5.1.1 Re ir culating lnear b l bearing s, sle ve type w ith rac wa y g r oo es 8

5.1.2 Re ir culating lnear b l bearing s, sle ve type w ithout r ac wa y g r oo es .9

5.1.3 Re ir culating lnear b l bearing s, lnear g uidewa y, car iag e type 9

5.1.4 Non-recir culating lnear b l bearing s, lnear g uidewa y, de p g r oo e an four-p int-contact ypes 1

5.2 Linear role bearing s 1

5.2.1 Re ir culating lnear r ole bearing s, lnear g uidewa y, car iag e type 1

5.2.2 Non-recir culating lnear r ole bearing s, lnear g uidewa y, fla V-angle an cr os ed role types 1

6 Dynamic eq i valent load 12

7 Basic rating lfe 12

Biblog raphy 14

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www iso org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www iso org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific terms an ex r s ions r lat ed to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www iso org iso/ for word html

This document was pr p r d b Te h ical C mmitt ee ISO/TC 4, R ol n bearin s , Subcommitt ee SC 8,

L ad ratin s a d lfe

This se on edition canc ls an r plac s the f irs edition (ISO 147 8-1:2 04 ), of w hich it cons itut es a

minor r vision with the folowing chang es:

— impro ement of Figur s 2, 4, 8 an 9;

— cor e tion of t erms an definitions (chang e of b l/ role guide sy st ems t o lnear b l/role

bearings);

— cor e tion of font ϕ chang ed t o φ);

— algnment with the lat es draf ing rules

A l s of part in the ISO 1472 se ies can be foun on the ISO websit e

It is oft en impractical t o es a l sh thesuita i ity of a lnear motion rol ing bearing sele t ed for a spe if ic

a plcation b t es ing The folowing proc d r s ha e pro ed t o be an a pro riat e an convenient

subs itut e for t es ing:

— l fe calculation with dynamic lo d (ISO 147 8-1);

— s atic lo d safety fact or calculation with s atic lo d (ISO 147 8- 2)

The l fe of a l near motion bearing is given b the dis anc w hich one of the rac wa smo es, in r lation

t o theothe rac wa , befor the f irs evidenc of fatigue develo sin the mat erial of one of the rac way s

or one of the rol ing element

The formulae for calculating the basic dynamic lo d ratingsar de ived from the theory of Lun be g

[7]

[8]

Rol ing bearing s — Linear motion r ol ing bearing s —

Part 1:

This document spe if ies methods of calculating the b sic dynamic lo d rating an b sic rating l fe

for l near motion rol ing bearings man factur d from cont emp rary, commonly used, high q alty,

hardened bearing st eel in ac ordanc with g ood man facturing practic an b sicaly ofconventional

design as r g rds the sha e of the rol ing contact surfac s The l fe of lnear motion rol ing bearings is

def ined an the con itionsar es a l shed for r la le l fe calculations

This document is not a plca le t o designs w he e the rol ing element o e at e dir ctly on the slde

surfac of the machine eq ipment, u les that urfac is eq iv lent in al r spe t t o the rac wa of the

l near motion rol ng bearing comp nent it r plac s

2 Normati ve r eferences

The e ar no normative r fe enc s in this document

3 Terms and definitions

F or the purp ses of this document, the t erms and definitions given in ISO 2 1 an ISO 5 9 , an the

folowing a ply

ISO an IEC maintain t erminolo ical data ases for use in s an ardization at the folowing ad r s es:

— IECEle tro edia: a aia le at ht p:/ www ele tro edia org

— ISO Onlne brow sing plat orm:a ai a le at ht p:/ www iso org o p

3.1

recir ulating lne r bal be ring, sle ve ty e, with or witho t raceway groo es

b sical y cy lin rical sle ve pro ided with a n mbe of closed lo ps of r cir ulating b l s designed t o

achieve l near rol ng motion along a hardened cy lin rical shaf

Note 1t o entry: S e Figure 1

Note 2 to entry: The raceway s in the sle ve can b designed cy lin rical as wel as st eel inserts with raceway

gro ves paralel to the a is

Figure 1 — Recir ulating l ne r bal be ring, sle ve ty e

3.2

recir ulating lne r bal (or roler) be ring, l ne r guideway, car iag e type

l near b l (or role ) bearing pro ided with a n mbe of symmetricaly ar ang ed, closed lo ps of

r cir ulating b l s (or role s) designed t o achieve lnear rol ing motion along a hardened guidewa

furnished with adeq at e rac way s

Not e 1t o entry: S e Figure 2

Figure 2 — Recir ulating l ne r bal (or roler) be ring, l ne r guideway, car iag e type

no -recir ulating l ne r bal be ring, lne r guideway, de p groo e ty e

l near bearing with b ls asrol ng element , each b l ha ing two p int of contact

Note 1t o entry: S e Figure 3

Note 2 t o entry: T e c os -sectional radi of the raceway gro ves in the two guideways are eq al an may lie

no -recir ulating l ne r bal be ring, lne r guideway, fo r-point-co tact ty e

l near bearing with b ls asrol ng element , each b l ha ing four p int of contact

Note 1t o entry: S e Figure 4

Note 2 t o entry: T e c os -sectional radi of the raceway gro ves for the four points of contact in the two

guideways are eq al an may lie b tween 0,5 D

w

an inf inity

Figure 4 — Non-recir ulating l ne r bal be ring, lne r guideway, fo r-p int-co tact ty e

no -recir ulating l ne r role be ring, l ne r guideway, flat ty e

l near bearing with ne dle role s or cy lin rical role s as rol ing element

Not e 1t o entry: S e Figure 5

Figure 5 — No -recir ulating lne r role be ring, lne r guideway, flat type

3.6

no -recir ulating l ne r role be ring, l ne r guideway, V-angle type

l near bearing with guideway s designed as p rt of a V with a 9 °angle

Not e 1t o entry: S e Figure 6

Not e 2t o entry: Ne dle roler or cylin rical rol er are used as rol ing elements

Figure 6 — No -recir ulating l ne r rol er be ring, l ne r guideway, V-angle ty e

no -recir ulating l ne r roler be ring, l ne r guideway, c os ed role ty e

l near bearing with cy lin rical role sar ang ed in a c os ed role cons ruction

Note 1t o entry: S e Figure 7

Figure 7 — No -recir ulating lne r rol e be ring, lne r guideway, c os ed roler ty e

3.8

l fe

<for an in ivid al lnear motion rol ing bearing dis anc one of the rac wa s mo es in r lation t o the

othe rac wa befor the f irs evidenc of fatigue develo s in the mat erial of one of the rac way s or one

of the rol ng element

3 9

relabiity

<for a group of a p r ntly identical lnear motion rol ing bearings o e ating un e the same con itions>

pe c ntag e of thegroupthat is ex e t ed t o at ain or ex ce d a spe if ied l fe

Note 1 to entry: T e relia ility of an in ivid al line r motion roling b aring is the pro a ility that he b aring

wil at ain or ex ce d a specif ied life

3.1

basic rating l fe

<for an in ivid al lnear motion rol ng bearing or a groupof a p r ntly identical lnear motion rol ng

bearings o e ating u de thesame con itions> lfe as ociat ed with 9 % r la i ity, with cont emp rary,

commonly used mat erial an man facturing q al ty an u de conventional o e ating conditions

3.1

basic dynamic load rating of a l ne r motion rol ing be ring

cons ant s ationary lo d that a lnear motion rol ng bearing could theor ticaly en ur for a b sic

dy amic eq ivalent load

cons ant s ationary lo d un e the influenc of w hich a lnear motion rol ng bearing would ha e the

same l fe as it would at ain u de theactual lo d con itions

3.13

directio of load

dir ction of lo d a pled for lo d rating calculation

Not e 1 t o entry: For calculation of b sic d namic lo d ratings, the direction of the lo d is def ined for al line r

motion b arings as shown by the ar ows in Figure 8

R oling b aring def ined in

Figure 8 — Direction of load

3.1

pitch diameter

< f r cir ulating l near b l bearing, sle ve ty e> diamet er of the cir le containing the c ntr s of the

b ls in contact with the rac way s, in a plane pe pendicular t o the bearing a is

3.1

nominal contact angle

angle betwe n the dir ction of lo d on the l near bearing an the nominal lne of action of the r sultant

of the for es transmitt ed b a bearing rac wa membe t o a rol ing element

Not e 1t o entry: S e Figure 9

Figure 9 — Nominal co tact angle

4 Symbols

F or the purposes of this document, the symb ls given in ISO 2 1, ISO 1 241 an Ta le 1 a ply

Table 1 — Symbols, terms and units

b

m

Rating fact or for contemporary, commonly used, high q ality, hardened b aring st eel in

ac ordance with g od man facturing practice, the value of which varies with b aring ty e

Adjustment actor for recir ulating line r b l b arings, sle ve ty e, with or without

race-way gro ves, ap lica le in the calculation of lo d ratings

F actor that depen s on the g ometry of the b aring components, the ac uracy to which the

various components are made, an on the material

1

f

s

Cor ection factor for short stroke ap lication, ap lica le for recir ulating line r b l b ar

-ings, sle ve ty e with or without gro ves,specif ied by the man facturer

1

i

Numb r of rows of b l s or rol er ap lica le in the calculation of lo d ratings

NOTE In the case of recir ulating line r b arings, sle ve ty e, it is the t otal n mb r of

< + 0° of recir ulating l

ine-ar b l b arings, sle ve ty e, with or without raceway gro ves, ap lica le in the calculation

F actor for recir ulating line r b l b arings, sle ve ty e, with or without raceway gro ves,

ap lica le in the calculation of lo d ratings

Raceway length ap lica le in the calculation of lo d ratings For recir ulating line r b ar

5 Basic d ynamic load rating s

5.1 Linear bal be r ing s

5.1.1 Recirculating lne r bal be ring s, sle ve type with rac eway g roo es

The b sic dynamic lo d rating for this bearing, in ve tical lo ding p sition, is given in F ormula (1):

5.1.2 Recirculating lne r bal be ring s, sle ve type w ithout rac eway g roo es

The b sic dynamic lo d rating for this bearing, in vertical lo ding p sition, is given in F ormula (2):

5.1.3 Recirculating lne r bal be ring s, l ne r g uideway, carr iag e type

The b sic dynamic lo d rating for this bearing is given in F ormula (3):

Thelo d-car ying a i ity of a bearing is not ne es ariy inc eased b the use of smale rac wa gro ve

radi, but it is r d c d b the use of larg er rac wa gro ve radi than those in icat ed in Ta le 3

The v lues of f

ccalculat ed with λ = 0, 9 ar given in Ta le 5

5.2 Linear rol er bear ing s

5.2.1 Recirculating lne r r oler be r ing s, lne r g uideway, carr iag e type

The b sic dynamic lo d rating for this bearing is given in F ormula (5):

6 Dynamic equi valent load

The dynamic eq iv lent lo d for a lnear motion rol ing bearing is given in F ormula (7):

= 1) w hen the dir ction of bearing lo d, F, is normal

(as shown in Figur 8) and bearing clearanc is in the normal rang e F or bearing lo d dir ctions othe

than normal an / r with ad itional t orq e lo ds, the v lues of k

Fshould be spe ified b the bearing

The con itions es a l shed for r la le l fe calculations ar asfolow s:

The lfe of r cir ulating l near b l bearings, sle ve ty e is influenc d b a pled short er s roke as

def ined a o e an can be ada t ed in F ormula ( 9):

C

Pp

Bibl og raphy

[1] ISO 2 1, R ol n bearin s — Dy namic lo d ratin s a d ratin lfe

[2] ISO 5 9 , Rol n bearin s — Voc ab lar y

[3] ISO 1 0 0-1, Rol n bearin s — Profied rai g ides fr lnear motio rol n bearin s — Part 1:

B ou dary dimens io s a d tole a c es fr s eries 1, 2 a d 3

[4 ] ISO 1 0 0- 2, R ol n bearin s — Profied rai g ides fr lnear motio rol n bearin s — Part 2 :

B ou dary dimens io s a d tole a c es fr s eries 4 a d 5

[5] ISO 1 2 5, Rol n bearin s — Sle ve t y pe lnear b l bearin s — B ou dary dimens ions a d

tole a c es

[6] ISO 1 241, R ol n bearin s — Sy mb ls fr p ys ic al q a tities

[7] Lundb r g G & P lmgren A Dy namic c ap c it y o rol n bearin s,A cta Polyt echnica, Me hanical

Engine ring S ries, R oy l Swedish A cademy of Engine ring S ienc s, Vol 1, No 3 (1 47)

[ 8] Lundb r g G & P lmgren A Dy namic c ap c it y o role bearin s , A cta Polyt ech ica, Me hanical

Engine ring S ries, R oy l Swedish A cademy of Engine ring S ienc s, Vol 2, No 4 (1 5 )

ICS  21.100.20

Pric based on 14 pag es