Bsi bs au 050 1 6 7 1998 (iso 13327 1998)

User s of Br itish Stand ar ds a re resp nsible for their corr ect a pl ica tion.. Amendment s is ued sinc p blcation í±Đ đãạ áơ ịơã-á Íơ¿ẳ¿đ ẳ- ì²-ơãơôơã±... ISO col la ora tes cl osely

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50- 1- 6.7:1998

ISO

ICS 4 1 0; 8 1 0.1

í±Đ đãạ áơ ịơã-á Íơ¿ẳ¿đ ẳ- ì²-ơãơôơã±

ú ụ ụ À ụ À ú

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T is British Stand rd, ha ing

be n prep r d u de the

dire ctionof the Enginee ring

Se cto Board,was publshed

u de the autho ity of the

Stand rds Board and c me s

into efet on

15 N ovembe 19 8

â BSI 0 -19 9

ISBN 0 5 0 3 6 1 9

This Br iti sh Stand ar d r eprod ces v er ba tim ISO1 3 7:1 9 an i mpl ements it

as the UK national stan a rd

The UK p r ti cip tion i n its pr ep r ation w as entrusted to Tech i cal Comm it e

AUE/4, Ty r es and w he ls for motor v ehicl es, w hich ha s the r esp nsi bii ty to:

— ai d en u ir er s to u d er stan the te t;

— present to the resp nsible interna tional/ Eur op a n commi tte any

enquiri es on the i nter pr etati on, or pr op sal s for chang e, an ke p the UK

inter ests informed;

— monitor r el ated i nter national an Euro e n d ev elo ments an

promulg a te them in the UK

A l ist oforg a nizations re r esented on thi s commit e ca n b o tai ned on

r eq est to its secr etar y

Cros - re e enc s

The Br i tish Standar d s whi ch impl ement intern ational or Euro e n

publcations refer red to in this d ocument ma b fou d in the BSI Stand ar ds

Catal og ue u d er the secti on entitled “ Inter nati onal Stand ar ds Cor resp nd en ce

Ind ex”, or b using the “ Find ” faci ty ofthe BSI Stand ard s Electr oni c

Catal og ue

A Bri tish Stan a rd d oes n ot pur por t to includ e al l the neces ary pr ov i sions of

a contr act User s of Br itish Stand ar ds a re resp nsible for their corr ect

a pl ica tion

Com planc wit h a Brit ish Stan ard does not ofit self c onf r imm unity

f om leg al o lg ations

S mmary of pag es

This docum ent comprises a font cov er , an i nside font cov er , p g es i an i,

the ISO title p g e, p g es i to i v , p g es 1 to 8, an insid e b ck cov er an

a ba ck cov er

This sta ndar d has b en upda ted (se co y r ig ht d ate) and ma y hav e had

amen ments incorp r ated Thi s wil l b i ndicated in the amend ment ta l e on

the i nsi de font cov er

Amendment s is ued sinc p blcation

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â BSI 0 -19 9 i

Pag e

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blank

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â BSI 0 -19 9

Contents

Pag e

An e B ( i nfor ma ti v e) Me sur ement methods ofmoment of

i ner ti a for dr um a nd ty r e a ssembl y — Deceler ation method 7

Fig ure 1 — Fr ee-b d y diag r am of ty re/ d rum sy stem,

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â BSI 0 -19 9 i ii

Foreword

ISO (the Interna tional Or g ani zation for Stan a rd ization) i s a world wide

fed er ation of nati onal stand ard s b di es ( ISO memb r b d i es) The work of

pre ar i ng Interna ti onal Stand ar ds i s normally car r ied out throug h ISO tech i ca l

commit e s Ea ch memb r b d y i nter ested in a subject for which a tech i cal

comm it e has b en esta bli shed ha s the rig ht to b r epresented on tha t

commit e Inter national or g anizati ons, g ov er nmenta l a nd non-g ov ernmental,

i n laison wi th ISO, also take p r t in the work ISO col la ora tes cl osely wi th the

Inter nati ona l Electr otechnical Commi ssi on ( IEC) on a ll mater s of

electr otech i cal stan a rd i zation

Draft Internationa l Stan a rd s ad opted by the tech i ca l commit e s ar e

cir cu lated to the memb r b d ies for v oti ng Publcati on a s an Inter national

Stand ar d r eq ir es a pr ov al b a t l east 7 % of the memb r b d ies castin a v ote

Inter nati onal Stand ar d ISO1 3 7 was pre a red by Technical Commit e

ISO/ TC3 ,Tyre s, rims and valve , S bcommi tte SC1 ,Cyc le, mo e d ,

motorc ycle tyr s a d rims

An e A forms an integ r al p r t of thi s Inter national Stand ar d An e B an

An e C a re for information only

Desc ipto s:Roa vehicle , motocycle , tyr s, pneumatic tyr s, te ts,la oato y te ts, physical

te ts, rl ng te ts

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â BSI 0 -19 9 1

Thi s Inter national Stand ar d sp ci fies methods for

me sur in r ol l in g resistance, u nder contr oll ed

la oratory condi tions, for new pneumatic ty res

d esig ned pr im ar ily for use on motor cy cl es The

r el ationshi p b twe n v alues o tai ned an the fuel

econ omy ofthe v ehicl e is u d eter mined , an such

v alues are not inten ed to b used to ind icate lev el s

of p r for man ce or q al i ty

Thi s Inter nati onal Standar d is a pli ca l e to a ll

motor cy cl e ty res

I ena bl es comp r isons to b mad e b twe n the

r ol ling r esista nce ofnew ty r es when they a re

fr ee-r ol ling str aig ht ahea d, in a p sition

p r pen icu lar to the dr um outer sur face, an in

ste d y -sta te cond iti ons

In me sur ing ty r e roll i g resistance, it i s neces ar y

to me sur e sma ll for es i n the pr esence of much

lar g er for ces I is, ther efor e, es enti al that

equipment an i nstr umentati on of a pr opri ate

ac ura cy b used

The fol lowi ng stand ard contains pr ov i si ons which,

thr oug h r efer ence in thi s te t, constitute pr ov i sions

of this Inter nati onal Standar d At the time of

publcati on, the ed ition i nd icated was v al i d Al

stan a rd s ar e subject to r ev i sion an p r ti es to

ag r eements ba sed on thi s Inter national Stand ar d

ar e encour ag ed to i nv esti g ate the p s i bi lity of

a pl y i ng the most recent ed ition ofthe stand ard

in i cated b l ow Memb r s ofIEC an ISOmaintain

r eg i ster of curr entl y v a li d Internationa l Stand ar ds

ISO 4 2 -1:1 8 , Deinitions ofsome te rms us d in

the ty re ind ustry — Part 1: Pne umatic t yr s

For the pu rp ses ofthis Inter national Stand ar d, the

d efi nitions g i v en i n ISO4 2 -1 a nd the fol lowi ng

d efi nitions a ply

3.1

roling r sist anc

F

r

los ofener g y ( or ener g y consumed) p r u i t of

d istance

NOTE T e SI u it cnventionaly usd fo the ol ng rsistanc

is the newton m etr pe r metre (Nãm/ m)

this is eq i v alent to the dr ag for ce in newtons ( N)

3.2

roling r sist anc coe fic ient

C

r

r atio ofthe r ol ling resistance, in newtons, to the lo d

on th e ty re, i n newtons

NOTE T is quantity is dimensionle s

3.3

capped inflat ion

proces of infla ti ng the ty r e an al lowi ng the

i nfla ti on pr es ur e to bu d up, as the ty re i s wa rmed

up while r un ing

3.4

r g ulated inflation

proces of inflatin the ty re to the r equ ir ed pr es ur e

i nde en ent ofits temp r ature, an ma intai ni ng

this infl ation pres ur e whil e the ty r e ru s u nder

l oad

NOTE T is is mot c m only done b using a r gulated

pr sur s ur e atac hed to the tyr thro ugh a r tating u ion

3.5

parasitic los

l os of ener g y ( or ener g y consumed) p r u it

d istance ex clud ing ty r e l os es, an at ri buta l e to

a rody na mic los , b ar i ng ficti on an other sour ces

ofsy stematic l os w hich ma y b in er ent i n the

3.6

skim r ading

ty pe of p r asiti c los mea sur em ent, in which the

ty re is ke t r ol ling ,withou t sli pp g e, wh e r ed uci ng

the ty r e loa d to a l ev el a t whi ch energ y l os w ithin

the ty r e itsel f i sv ir tual l zer o

3.7

m ac hin e r ading

ty pe of p r asiti c los me surement, inv olv i ng los es

ofthe test machi ne, e clusi v e of l os es i n the

r otatin spi ndl e whi ch ca rr ies the ty r e a nd r im

4 T est methods

The folowi ng al ter nati v e me sur ement methods

ar e g i v en in this Internationa l Stan a rd :

a) For e method : the re ction for ce at the ty r e

spind l e

b) Torque method : the tor que input to the test

d rum

c) Power method: the p w er input to the test

d rum

d ) Decelera tion method: the deceler ation of the

test dr um an ty r e a ssembly

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â BSI 0 -19 9

5.1 Drum spec ific ation s

5.1.1Diameter

The test dy nam ometer shal ha v e a cy lindr ical

fly whe l ( dr um) w i th a d iameter of b twe n 1,5m

an 3m i nclu si v e ( refer ence d r um

d iameter : 1,7 m) I t shoul d b noted tha t the

r esults a re di ffer ent; se 9.3 for d r um d ia meter

cor recti on for compa risons, i f neces a ry

5.1.2Surfac

The su rface of the d r um shal b smo th ste l or

tex tur ed an shal l b ke t cl ean ( se cla useA 6)

5.1.3Width

The w id th of the dr um test su rface shal l e ce d th e

wid th of the test ty re tre d

5.2 Tes rim

The ty re shal b mou ted on a test r im, as sp cified

in An e A

5.3 Lo d, al gnm ent, con trol an

in strument ation ac uracy

Me surement of these p r ameter s shal l b

sufici ently ac ur ate an pr ecise to prov id e the

r eq ir ed test da ta The sp ci fic an r esp cti v e

v alues a re show n i nAn e A

5.4 The m al environ men t

5.4.1Re erenc conditions

The r efer ence ambi ent temp r atur e, a s me su red

on the rotati onal ax is ofthe ty re,1m aw ay fr om the

plan e touchin the ne r est ty re sid ewall , shal

5.4.2Alternativ conditions

Ifthe r efer en ce temp r atur e cannot b o tained , the

r ol ling resistance me sur ement shall b cor rected to

stand ard temp r atur e cond itions in a ccor da nce

with9.2

5.4.3Drum surfac temperature

Car e should b ta ken to ensur e that the

temp r atur e of the test d rum sura ce is

a pr oxi mately the same as the a mbi ent

temp r atur e a t the b g in in of the test

6 T est conditions

The test consists of a measurement ofr oli ng

r esista nce in whi ch the ty r e is infla ted a nd the

infla tion pr es ur e a ll owed to buid up (i “ ca pp d

ai r ”)

6.1 Tes spe ds

The v alu e shal l b o tai ned at a dr um v eloci ty of

8 km/ h for ty res mar ked wi th a sp ed sy mb l

a ov e “L”;

5 km/ h for ty res mar ked with a sp ed sy mb l

“ L” an b low

6.2 Tes lo d

The standar d test lo d sha ll b computed fom

6 % ofthe ma x imu m lo d ca pa ci ty of the ty r e

for l ig ht a nd stand ar d lo d v er sions;

8 % ofthe ma x imu m lo d ca pa ci ty of the ty r e

for r ei nfor ced v er sion

I shal b ke t withi n the tolera nce sp ci fied in

6.3 Tes infl ation pr s ur

The infl ati on pr es ure shal l b

2 0 kPa for lg ht a nd stand ar d lo d v er sions;

2 0 kPa for r ei nfor ced v er sion

The infl ati on pres ure shal l b ca p d wi th the

ac u racy sp cifi ed i nA.4.1

6.4 Durat ion an d velocity

When the deceler ation method is sel ected , the

fol low in r eq i rements a ply :

a) for d r ati on, ỷ t, the time incr ements shal not

e ce d0,5s;

b) any v ari ati on ofthe test dr um v elocity shal l not

e ce d1km/ h

7.1 G ene al

The choice of an i nd iv id ual method is l eft to the

tester For e ch method, the test measurements

shal l b conv er ted to a r oll i g resistance for ce actin

at the ty r e/ d r um i nter fa ce

The test pr oced r e ste s d es r ib d in7.2 to7.7 shal l

b foll owed in the sequence g i v en

To ensu re r ep a ta bil ity of me sur ements, a n i ni ti al

br ea k-i n an d co li ng p r iod is r equir ed pri or to the

star t of the test S ch a br ea k- n should b car ried

ou t on a test d r um ofat le st1,5m d i ameter for a

p r iod ofat l east 1h, a t a minimum v eloci ty

of8 km/ h, w i th the lo d an i nfla tion pr es ur e

g i v en in6.2 an 6.3 r esp cti v ely

7.3 The mal con ition ing

Pl ace the infl ated ty re in the therma l env i ronment

ofthe test location for at lea st3h

7.4 Pr s ur adjust men t

After ther mal cond itioni ng , the inflation pr es ur e

shal l b a djusted to the test pres u re, an

v er ified1 mi n after the adjustment w as ma de

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â BSI 0 -19 9 3

7.5 Warm- up

The ty r e shal b r un at constant test v eloci ty u ti

r eachin a sta i lised stea dy -state v a lue of r oll ing

r esi stance A wa rm-up p r iod ofat l eas t3 mi n at

the test sp ed i s r eq i red

7.6 Measur ment and r cordin g

The folowin shal l b me sur ed an r ecor ded

( se Fi g ure 1):

a) test v elocity ,U

n

;

b) loa d on the ty r e normal to the d ru m sur face,

L

m

;

c) t est infl ati on pr es ure:

1) i nitial, a s defined in7.4,

2) fi na for ca p d inflation;

d ) the d ri v ing torque on the dr iv e shaft, T

t , the

ty re spind le for ce, F

t , the input p wer , VI A, or

the d eceler ation of the test d rum/ ty re/ whe l

as embly ,ỷ V/ ỷt, d ep nd in on the method ;

e) distan ce, r

L ( se 8.2.1);

f) ambient temp r ature, t

amb

;

g ) test d rum rad i us, R ;

h) test method chosen;

i ) test ri m ( d esig nati on and mater ia l)

7.7 Measur ment of parasitic l os es

Deter mi ne p r asi ti c los es b one ofthe pr oced ures

g iv n in 7.7.1 to 7.7.3

7.7.1S kim rea ing

a) R ed uce the l oa d to mainta in the ty re at the test

v eloci ty wi thout sl ip a g e to, for ex ampl e, 5 N

b) R ecord the spindl e for e, F

p , i nput torque, T

p ,

or the p wer, whi chev er a pl ies

c) Recor d the lo d on the ty r e normal to the d rum

sur face,L

p

NOTE T e measur d v lue include s the bearing and

ae od namic lo s s o f the whe l,the tyr , and the drum los s

which ar als to be c nsideed

7.7.2Machine rea in

a) R emov e the ty re fr om the dr um sur face

b) At the test v el ocity ,U

n , r ecor d the i nput

tor que,T

p , the p wer , or the test dr um

d ecel er ati on, w hichev er a pl i es

NOTE T e measur d v lue include the drum lo ss to be

cnside ed

Fig ur 1 — Fr e- body diag ram oft yr /drum sys em, as umin no bearin g an d windag e los es

ú ụ ụ À ụ À ú

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â BSI 0 -19 9

7.7.3De elerat ion method

a) Remov e the ty r e fr om the test sur fa ce

b) Record the d eceler ation ofthe test

d rum,ỷ V

o /ỷ t and that of the u l oa ded

ty re,ỷ V

po

/ ỷ t

NOTE T e measure d v lue include the bearing a nd

ae od na mic lo s s of the whe l, the tyr , and the drum lo s s

which ar a ls to be c nside e d

8.1 S btraction of parasit ic los es

The p r asi tic los es shal l b subtr acted as shown

in8.1.1,8.1.2 or 8.1.3

8.1.1Skim rea ing

S btr act the skim re d ing fr om the test

me sur ement

8.1.2Machine rea ing

S btr act the ma chi ne re din fr om the test

me sur ement

NOTE When the machine r a ing method is us d to dete mine

pa rasitic los s fo the to que o powe method,the rsulting

r l ng r sistanc include aeod namic lo se s o f the tyr and

whe l as wel as the tyr-spindle friction

8.1.3Parasitic losses fo the de eleration

method

Cal culate the p ra si tic l os es F

pl

i n newtons as

w her e

I

D

i s the test d ru m i ner tia in r ota tion, in

kil og ram metr es sq a red;

R i s the test d rum surace ra dius, in metr es;

V

vo

is the test d rum ang ul ar v el oci ty , wi thout

ty re, in ra dians p r second ;

ỷ t

o

is the time inc ement chosen for the

me surement of the p r asiti c los es withou t

ty re, in second s;

I is the ty r e an w he l i nerti a i n r otation, i n

kil og ram metr es sq ared;

R

r

i s the ty r e r ol lin r ad iu s, in metr es;

V

po

is the ty r e ang ul ar v el ocity , u loa ded ty re, in

r adians p r secon

8.2 Roll ing r sis anc calc ulation

The net v al ues of d ri v in torque, spindl e for e,

p wer or deceler ation ar e to b conv er ted to roli ng

r esistance,F

r , ex pr es ed in newton s, usin the

a pr opri ate method, a ssh ow n in 8.2.1 to 8.2.4

8.2.1Fo c method at ty re spindle

The roll i g r esi sta nce, F

r , in newtons, is cal cula ted

w ith the eq a ti on:

F

r

= F

t [ 1 + (r

L /R )]

w her e

F

t

i s the ty r e spind l e for e, in newtons;

r

L

i s the d istance fr om the ty r e ax is to the dr um

outer sur face u nder stea dy -state cond i ti ons, in

metres;

R is the test dr um r ad iu s, in metres

8.2.2To que method at drum axis

The roll i ng r esi sta nce, F

w ith the eq a ti on

w her e

Tis the i npu t torqu e, i n newton metr es;

R is the test dr um r ad iu s, in metres

8.2.3Power method at d rum axis

w her e

Vis the electr ical p tential a pl ied to the

ma chi ne dr iv e, in v olts;

A is the electr ic curr ent d ra wn by the machi ne

d riv e, in a mp res;

U

n

i s th e test d rum v el oci ty , i n kiometr es p r

hour

8.2.4De eleration method

w her e

I

D

is the test d rum inerti a in r otati on, in

kil og r am metr es sq a red;

R i s the test dr um sur face r ad iu s, in metr es;

ỷ t

v

i s the ti me i nc ement chosen for

me surement, in secon s;

V

v

i s the test dr um ang ular v eloci ty, lo ded ty r e,

i n r adi ans p r second ;

I i s the ty r e an whe l inerti a in r otation, in

kil og r am metr es sq a red;

F

r T

R

-=

F

r

3,6VìA

U

n

=

Tiêu đề	Tyres and Wheels Part 1: Tyres — Section 6: Motorcycle Tyres — Subsection 6.7 Method of Test for Measuring Rolling Resistance
Trường học	British Standards Institution
Chuyên ngành	Standards
Thể loại	British Standard
Năm xuất bản	1998
Thành phố	London

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Số trang	19
Dung lượng	1 MB