Bsi bs au 050 1 1 4b 1996 (2000) iso 10191 1995

BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 1 1 4b 1996 ISO 10191 1995 Incorporating Amendment No 1 to BS AU 50 1 4a 1996 (Renumbers the BS as BS AU 50 1 1 4b 1996) Tyres and wheels — Part 1 Tyres — S[.]

ISO

10191:1995

Incorpora ting

Amend ment No 1 to

BS AU5 -1.4a :19 6

(R en mbers the BS a s

BS AU5 -1-1.4b:

19 6)

ICS 4 1 0; 8 1 0.1

This British Stan ard, ha ing

b en pre ared u der the

directionof the Engine ring

SectorBo rd, was published

u derthe authority of the

Stan ards Bo rd an

comesinto fect on

1 July 1 9

© BSI 0 -2 0

ISBN 0 5 0 2 9 6 4

The prep ration of this British Stand rd was entrusted to Tech ical

Commit e AUE/4, Tyres an whe ls for motor v ehicles, upon which the

fol owing bodies were represented:

Ag ricultural Eng ine r ’ Association

Automobi e As ociation

British Industrial Truck As ociation

British Pres ure Gaug e Man facturer ’ As ociation

British Rub er Man facturer ’ As ociation

Confederation of Pas eng er Transport UK

Dep rtment of Transport

Freig ht Transport As ociation

Institute of Road Transport Eng ine r ( Inc)

Motor Cy cle Ind ustry ’s Association of Great Britain Ltd

Motor Ind ustry Resear h As ociation

National Ty re Distributor ’ As ociation

Retrea Man facturer ’ As ociation

Roa Haulag e Association Ltd

Society of Motor Man facturer and Tra er Ltd

Am endm ents is ued sinc publ cation

10 62 Ma 19 9 Indicated b a sidelne in the marg in

Pag e

Annex A ( informativ e) Hig h-spe d test — Test conditions

Ta le 7 — Bea u seating for temporary use sp re ty res 6

National foreword

This S bsection of this Part of BS AU5 has be n prep red b Tech ical

Commit e AUE/4 and super edes BS AU 5 -1-1.4:19 4, which is withdrawn It

is identical with ISO10191:19 5 Pa ss nger ca r tyres — Verifing tyre ca pa bil ite

— La bora tory te t method s, publshed b the International Org anization for

Stand ard ization ( ISO)

Other Parts of this stand ard are as fol ows:

— Pa r t 2: Whe l s a nd rims;

— Pa rt 3: Va l ve ;

— Pa r t 4: R im profil es a nd d imensions

Cros - referenc s

The Tech ical Commit e has rev iewed the prov isions of ISO42 3-1:19 9 to

which normativ e reference is ma e in the text, and has decid ed that they are

ac epta le for use in conju ction with this stand ard

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g es i an i ,

p g es1 to 7 and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be indicated in the amendment ta le on the

inside f ont cov er

1 Scope

This International Stand rd specifies test methods

for v erify ing the ca a i ities of ty res for p s eng er

car Of the test methods presented , only some ma

be required depending on the ty pe of ty re to be

tested

The tests are car ied out in a la oratory u d er

control ed conditions

It includ es a streng th test for as es ing the

ca a i ity of the ty re structure, with respect to

braking energ y , in the trea area

A secon test, the bead u seating test, as es es the

resistance of the ty re to bea unseating It a ples to

tubeles ty res only

A third test, the end urance test, as es es the

resistance of the ty re with respect to serv ice at ful

loa and mod erate spe d ov er long d istances

The fourth test, the hig h spe d test, as es es the

ca a i ity of the ty re ac ord ing to its spe d categ ory

The test method s presented in this International

Stand rd are not intend ed for g ra ation of ty re

per ormance or q ual ty lev els

This International Stand rd a ples to al

p s eng er car ty res

2 Norm ative reference

The fol owing stand ard contains prov isions which,

throug h reference in this text, constitute prov isions

of this International Stand ard At the time of

publcation, the edition indicated was v ald Al

stand ards are subject to rev ision, and p rties to

ag re ments b sed on this International Stand rd

are encourag ed to inv estig ate the pos ibi ty of

a ply ing the most recent edition of the stand rd

indicated below Member of IEC and ISO maintain

reg ister of cur ently v ald International Stand ards

ISO 42 3-1:19 9, Definiions o some terms us d in

the tyre ind ustry — Pa rt 1: Pneuma tic tyres

3 Definitions

For the purposes of this International Stand rd , the

d efinitions g iv en in ISO42 3-1 and the fol owing

d efinitions a ply

3.1

bea separation

breakdown of bond betwe n components in the bea

area

3.2

belt separation

p rting of rub er compou d betwe n belt lay er or

betwe n belts and ples

3.3

chunking

break ing awa of pieces of the trea

3.4

cord separation

cord p rting f om a jacent rub er compou ds

3.5

cracking

any p rting within the trea , sidewal or in erlner

of the ty re extending to cord material

3.6

innerlner separation

p rting of in erlner fom cord material in the

car as

3.7

o en spl c

any p rting at any ju ction of tread , sid ewal or

in erl ner that extend s to cord material

3.8

ply separation

p rting of rub er compou d betwe n a jacent ples

3.9

sidewal separation

p rting of the rub er compoun fom the cord

material in the sidewal

3.10

trea sep ration

pul ng awa of the trea f om the ty re car as

3.1

test rim

any rim on which the ty re ma be fit ed that

conforms to the dimensions of the recommended

rims for the p rticular ty re desig nation and ty pe

3.12

test drum spe d

peripheral spe d of the ste l test drum

3.13

maxim um lo d rating

ma imum loa that the ty re is rated to car y

ac ording to its spe d categ ory

4 Test equipm ent

The test eq uipment consists of items in4.1 to4.4

4.1 Test drum, cy lindrical driv en fly whe l ( drum)

hav ing a diameter of1,7m % or2m %

The sur ace of the drum shal be smo th ste l The

width of the test surace shal be equal to or exce d

the ov eral width of the test ty re

+2

0

+2

0

For the test drum the loa ing dev ice shal hav e a

ca acity of at least1 0 0kg and the ac uracy shal

be within±1 % of the ful s ale

For the test drum, the spe d ca a i ty of the

equipment shal be a equate for the req uirements of

the test method s The ac uracy of the test drum

spe d shal be within km/ h

4.2 Plung er, cy lindrical ste l plu g er ofsuficient

leng th with a hemispherical end an a diameter

of19mm±1,6mm

For the plung er eq uipment,the load ing d ev ice shal

permit g ra ual a pl cation of the for e.Indicator of

displacement and for e prov id ed shal hav e an

ac uracy within±1 % of ful s ale

For the plu g er eq uipment, the displacement spe d

shal be controled with an ac uracy within±3% of

the ful s ale

4.3 Bea unseating block, of one of the two ty pes

inFig ure 1

The bea u seating block loa ing dev ice shal

permit prog res iv e a pl cation of the for e

Ind icator of d isplacement and for e prov ided shal

hav e an ac uracy within±1% of ful s ale

The displacement spe d of the hea u seating block

shal be controled with an ac uracy within±3% of

the ful s ale

4.4 Inflation pres ure g aug es, with a ma imum

s ale v alue of at least5 0kPa with an ac uracy

within±5kPa

5.1 Streng th test

5.1.1 Preparat ion o t yre

5.1.1.1 Mou t the ty re on a test rim and inflate it to

the pres ure specified inTa le 1

Ta le 1 — Inflation pres ures for

resistanc test

5.1.1.2 Maintain the as embly at test ro m

temperature for at least3h

5.1.2 Te t pr c dure

5.1.2.1 Rea just the ty re pres ure to that specified

in5.1.1.1 and mou t the as embly on a fixture

5.1.2.2 Position the plu g er as near to the centrelne

as pos ible, av oiding penetration into the trea

g ro v es, and for e the plu g er perpend icularly into

the trea at a rate of5 mm/min±2,5mm/ min

5.1.2.3 Record the for e an penetration at the

moment of breaking ( se also5.1.2.7) at each of fiv e

test points a proximately eq ualy sp ced arou d

the ty re cir umference Check the pres ure before

mov ing to the next test point

5.1.2.4 I the ty re fai s to break before the plu g er is

stop ed on reaching the rim, then the ty re is d eemed

to hav e p s ed the test at that point

5.1.2.5 Compute the breaking energ y , W, in joules

for each test point, except those considered

b 5.1.2.4, b means of the fol owing formula:

where

5.1.2.6 Determine the breaking energ y v alue for the

ty re b computing the av erag e of the v alues

obtained

5.1.2.7 W hen an a propriate dev ice which

automaticaly ev aluates the v alue of the energ y Wis

av ai a le, the penetration can be stop ed shortly

after hav ing achiev ed the pres ribed v alue

5.1.2.8 In the case of tubeles ty res, means ma be

prov ided to ensure the retention of the inflation

pres ure for the d uration of the test

5.2 Bea unseating test

This test a pl es to tubeles ty res only

5.2.1 Prep rat ion o t yre

5.2.1.1 W ash the ty re, dry it at the bead s, and

mount it without lubrication or a hesiv e on a clean,

p inted test rim The rim contour shal be one of

those specified for the fitment of the test ty re

5.2.1.2 Mou t the ty re on a test rim and inflate it to

the pres ure specified inTa le 1

Tyr ty e

Pr s ur

kPa

T ty pe ( temporary use) 3 0

NOT In case of other tyre ty es, the ty re man facturer shal

sen a re uest to ISO for insertion in this ta le of a diferent

test pres ure, with re sons

+2

0

F is the for e, in newtons;

P is the penetration, in mi imetres

Fig ure 1 — Diag ram s of bea unseating blocks

5.2.2 Te t pr c dure

5.2.2.1 Mou t the ty re and rim as embly on a

fixture as shown inFig ure 2

5.2.2.2 Position the bead u seating block (4.3)

ag ainst the ty re sidewal at a horiz ntal distance P

as shown inTa le 2

Ta le 2 — Distanc P f om bea unseating

block ( se Fig ure 2)

5.2.2.3 Apply a for e throug h the block

tothety reouter sidewal at a rate

of5 mm/ min±2,5mm/min

5.2.2.4 Inc ease the for e u ti the bea block

u seats or u ti the pres ribed v alue is reached

5.2.2.5 Repeat the test at least four times at places

a proximately equal y sp ced arou d the ty re

cir umference

5.3 Enduranc test

5.3.1 Prep rat ion o t yre

5.3.1.1Mou t the ty re on a test rim and inflate it to

the pres ure specified inTa le 1

5.3.1.2 Maintain the ty re and rim as embly at an

ambient temperature of not les than3 °C fo at

least3h

5.3.2 Te t pr c dure

5.3.2.1 Rea just the ty re pres ure to the v alue

specified in5.3.1.1 immediately before testing

5.3.2.2 Mount the ty re and rim as embly on a test

a le so that the ty re ma be pres ed ra ialy ag ainst

the outer face of test drum

5.3.2.3 During the test the ambient temperature, at

a distance of not les than15 mm and not more

than1 m f om the ty re, shal be at least 3 °C No

prov ision shal be mad e for co lng the ty re during

the test

5.3.2.4 Cond uct the test, without inter uptions, at

not les than8 km/h test spe d with load s an test

period s not les than those shown inTa le 3

Ta le 3 — Test parameter for enduranc

5.3.2.5 Throug hout the test, the inflation pres ure

shal not be cor ected and the test load s shal be

kept constant at the v alue cor esponding to each

test period

5.4 Hig h spe d test

For those ty res not marked with a serv ice

d es ription, note should be taken of the a d itional

test conditions g iv en inAn ex A

5.4.1 Prep rat ion o t yre

5.4.1.1 Mount the ty re on a test rim, inflate it to a

pres ure related to its spe d symbol, ty re v er ion

and load ty pe, as shown inTa le 4

Fig ure 2 — Bea unseating fixture

Dimensions in milimetres

Nom inal rim

diam ete co e

Dim ension

P

T ty e tem porary

use sp r tyr s

All othe tyr s

Tes pe io

Duration

Lo d as a pe c nta e of tyr

m axim um lo d rating

Ta le 4 — Inflation pres ures for hig h spe d test

The ty re manufacturer ma request, g iv ing reasons,

the use of a d iferent test inflation pres ure In such

a case, the ty re shal be inflated to that pres ure

5.4.1.2 Maintain the ty re an rim as embly at test

ro m temperature for not les than3h

5.4.2 Te t met hod

5.4.2.1 Before or after mou ting the ty re and rim

as embly on a test a le, read just the ty re pres ure

to that specified in5.4.1

5.4.2.2 Pres the ty re and rim as embly ag ainst the

outer face of the test d rum

5.4.2.3 Ap ly a load eq ual to8 % of the ma imum

load rating of the ty re to the test a le

For ty res of spe d sy mbol V, the test load shal be

equal to7 % of the load cor esponding to their loa

index,i.e.8 % of the ma imum loa al owed

at24 km/ h

For ty res of spe d sy mbol W and Y, the test load

shal be eq ual to6 % of the load cor espond ing to

their loa ind ex, i.e 8 % of the ma imum loa

al owed at 27 km/h and3 0km/ h, respectiv ely

5.4.2.4 Throug hout the test the inflation pres ure

shal not be cor ected and the test loa shal be kept

constant

5.4.2.5 During the test, the temperature in the test

ro m shal be maintained at betwe n20°C

and3 °C, or at a hig her temperature if the ty re

man facturer ag re s

5.4.2.6 Car y the test throug h without inter uptions

as folows, in relation to the ty re spe d sy mbol an

the test drum diameter

a) For tyres ofspe d sym bol L to W

The initial test spe d is equal to the ty re’s spe d

categ ory

— les 4 km/ h on a1,7m drum, or

— les 3 km/h on a2m drum

1) Accelerate the eq uipment at a constant

rate such that the initial test spe d is

reached at the end of10min f om start-up

2) Operate the eq uipment with the test

drum spe d at the initial test spe d

for10min;

— then, at the initial test spe d plus10km/h

for at least10min;

— then, at the initial test spe d plus 20km/h

for at least10min;

— then, at the initial test spe d plus 3 km/h

for at least10min;

— an finaly , for a further 10 min, at the

initial test spe d plus

3 km/h on one or other of the d rums, or

4 km/ h on the1,7m drum only

b) For tyres of spe d sym bol Y

The test conditions on a2m d rum are the

folowing

1) Accelerate the eq uipment at a constant rate

such that a spe d of27 km/h is reached at the

end of10min fom start-up

2) Operate the equipment at27 km/h

for20min;

— then, at28 km/h for10min;

— then, at29 km/h for10min;

— and finaly , at3 0km/ h for10min

3) W hen a1,7m drum is used, red uce the

a ov e spe ds b 10k m/ h

S e d sym bol

Inflation pr s ur

kPa

Norm al

(s and rd)

Reinfor ed

(extra lo d)

NOT In case of high pres ure “emp rary use sp re” ty res, identified b a prefix T in the size designation,the ty re shal b

inflated to 4 0 kPa

6 Requirem ents

6.1 Test sam ple

Thre ty res with id entical characteristic ,e.g siz

d esig nation and serv ice d es ription or ma imum

load rating and spe d ca a i ity , shal comprise a

test sample:

a) one ty re shal be used for the measurement of

bead unseating and then of streng th;

b) a secon ty re for the endurance test;

c) a third for the hig h-spe d per ormance test

The pres ures, loa s spe ds and durations shal be

as specified for each test method

Each test sample shal conform to the requirements

specified in6.2 to6.5 as a propriate

6.2 Streng th test

6.2.1 Each test sample shal me t at least the

req uirements for minimum breaking energ y

specified inTa le 5, when tested in ac ord ance

with5.1

Ta le 5 — Minimum breaking energ y

6.2.2 For ty res with nominal section wid th les

than16 mm, the required energ y v alue shal be

reduced b 25%

6.2.3 For hig h pres ure “temporary use sp re” ty res,

identified b a prefix T in the siz d esig nation, the

energ y req uired shal be

a) 29 J for ty res with a ma imum loa rating

of4 0kg and a ov e;

b) 2 0 J for ty res with a ma imum loa rating

below4 0kg

6.3 Bead unseating resistanc ( tubeles ty res)

6.3.1 W hen tested in ac ord ance with5.2, the

a pled for e required to u seat the ty re bea at the

point of contact shal not be les , in relation to the

nominal section wid th of the ty re, than that shown

inTa le 6

Ta le 6 — Bea unseating

6.3.2 For hig h pres ure “ temporary use sp re” ty res,

identified b a prefix T in the siz d esig nation, the

for e required to u seat the ty re bea shal not be

les , in relation to the ty re loa index, than that

shown inTa le 7

Ta le 7 — Bea unseating for temporary

usespare tyres

6.4 Enduranc test

6.4.1 W hen the ty re has be n subjected to the

la oratory end urance test specified in5.3, using a

test rim and a v alv e which u d erg o no permanent

d eformation an alow no los of air, there shal be

no v isual ev id ence of trea , sidewal, ply , cord,

innerlner, belt or bea sep ration, ch n ing , open

spl ces, c acking or broken cord s

6.4.2 The ty re pres ure measured immediately after

the test shal not be les than the initial pres ure

specified in5.3.1.1

6.5 Hig h- spe d test

6.5.1 After completion of the la oratory hig h-spe d

test specified in5.4 using a test rim and a v alv e

which u d erg o no permanent d eformation an al ow

no los of air, there shal be no v isual ev id ence of

trea , sid ewal, ply , cord , in erl ner, belt or bea

sep ration, ch n ing , open spl ces, c acking or

broken cord s

6.5.2 The ty re pres ure measured immediately after

the test shal not be les than the initial pres ure

specified in5.4.1.1

Tyr ve sion

Br aking ene g

min

J

Reinfor ed/extra loa 5 5

NOT In the case of other tyre v rions or when pres ures

difer fom those recommen ed for tyre me surements in

Ta le 1, the v lue of the minimum bre king lo d E

min , in joules,

is calculated as folows:

E

min

= 7,3 ( p

1 –1 0)

where p

1

is the inflation pres ure, in kilo as als,sp cified for

the test

Nom inal se

tion, S,

width

For e

Lo d index

For e

N