Britis h In us try Res earc h As s ociatio National ’&E Da uton’ As sociatio Retread M anutktu rers’ Ass ociatio Roa Haula e Ass ociatio L td... Wke kand rim Part 3.
Trang 1v r e s and wheels
Part 1 ' mes
Sect ion 4 Ag ri c u l tu ra l t ract or an d ma c h i n e tyres
4.5a
Subsection
4.5a : 1996
1996
ICs 4 04 50; 8.16.3
Trang 2ES1 ßS*AU*SO:PTL :SUBSEC*4-5A 96 Lb24bb9 05b4110 454
Se o d edi o n Septemb er 19 6 No
B S AU 60:Part 1 : Su bse c ti on 4.5.a : 1 9
D a Textafec ted
The p rep arati o n ofthi Britis h S adr w as e ntru sted to Tec hnic al Commite
AW4, QE I a d whe ls for moto vehicles , up o n which the folowing bdi s were
represented
Agr icult ud Egier’ Ass ociatio
Automo ie Ass ociatio
BriWin us triai ? hi c k As s ociatio
BiihPre ssu re Gaug e Ma ufacturem’ As sociatio
British Rubb er Man facturen’
As o itin
C onfderation ofPas s enger ?ka s p ort UK
D epartment ofPansp o rt
F‘rei t n-ansp O rt Ass ociatio
I n stitu te ofRoad Ba nsp rt Eng i nee rs (in )
Motor Cycle in ustr ’s Ass ociatio ofGre t Britain LM
Britis h In us try Res earc h As s ociatio
National ’&E Da uton’ As sociatio
Retread M anutktu rers’ Ass ociatio
Roa Haula e Ass ociatio L td
S ciety ofMotorMa ufacturer a d W e mLt d
The folowin B S I re fe re n ce s
re l ate to the work o ti
s a n da r d
Commi e re fe re n ce AUE14
D f for c o mment 9 4 /7 0 3 3 5 1 DC
- ISBN O 0 80 2605 8 5
Trang 3Co ntents
page
Spe ification
% p
Nonn tive re fe rences
D en itio ns
lw des ignaiion
Ma king
% dimens ions
Qre dimens ions
Meth d ofme asu re ment oftr dimens ions
'&re a d rim c o o rdi nati o n
A ( no rmati v e) 'Qre dimens ions
B (normative) Ap ro ed rmwi d th
6
7
T bl es
4 C oefic ients fo r dculation ofap p ro v ed rim widths 5
B.l
7
C.l Ap ro ed rim con tou rs - '9 ' se ries tra tor tyr s for spe ial dtiv tio
Ap ro ed rim width for tyr s with a pa t rto 90 to 70, inc lus ive
C.2 Ap ro ed rim co tom - '7 ' series lyres
C.3 Ap ro ed r imcon tou rs -' 70 ' se ries tyres
8
8
Trang 4Na ti on a l foreword
This S bs ec tio n ofB S A 5 has b ee n p rep ared b Te h ical Cornmite AW4 a d
sup erse de s B S AU 5 : p r 1 : Subdon4.5 : 19 2, which is with rawn I is identic al
w ithI 0 7 6 -1 : 19 6 Ty-es and rim s (metric series) for aqrictdtud tmctors and
ma h in s -P art 1
:
Tyw desi gn ti on, di mensw ns, murking and tyre /m m
co ord.in a tio n , pub lis hed by t he I n t~rn ation al w o nfor Stand ankalio n ( N)
BS AU 50 is pub lis hed in fo r Parts :
Part I lprfZ5
Part 2 Wke kand
rim
Part 3 valves
P ari 4 Rimpro i e and dimenswns
IS 7 6 spe ifies req irements for metric seies tyrs a d rims fo agric ultural
tracto s an d m achina an d I 0 86 4 spe ifies req irements fo agric ultural tra tor
drive- whe l tye
Cros -re fe re n c e s
Pb ia in r efr r ed t o
I 07 6 -2 : 19 6
I 0 4 5 3: 1994
C or esp onding Brit ish Sta nda r d
B S AU 5 1/e a n d w heel s
Part1Fy w s
Sec tio n 4 Agri culCUd tmctor a d mu chin e tyr s
S bs ec tio n 4.6 : 19 6 Sp&&at.io for ser vice de criptio
and ladW ingsfor metric seies ty a
(Identic al)
Part 4 Rimp o i esand dimen ion
Sec tio n 4 Ag icult uml t m~t or d muchim rim
S bs ec tio n 4.la : 19 5 Spsci f ati on for pìy-rating ma*d
seies rims
(dentc i
The Te h ical Commite h s reviewed the provis ions ofI 0 42231, to which
noirn tive re ferenc e is ma e in the text,a d h s dec ided th t they a e ac c eptable for
use i n c onju c tion with thi stand rd
Complanc with a Brit ish Standar d does n ot ofit elf con fe r immu ity
from l e g a l o l i g a ti on s
Trang 5
-Tyre s and rims (metric s erie s ) f or agr icultur al tr actor s and
This p a rt of IS078 6 7 establsh s th siz e d sig at io ,
th dime sio al c a lc ulatio an d th markin s of th
met r ic series of tyres p rimarily inte d d for use o
aaric ultural tra ctor s an mac hin s Ty re an r im c o-
-rn o;dinatio is also given
m
-=
It ap le s to b ias-b elt ed, diago nal an radial tyres
mounte d o 5" tapere rims, as spe cifie d in IS0 4 51-3
Only establsh d rim dia met ers and w idths within th
This p a rt of IS07 6 also ap le s to difer ent co n-
c ep t s an ty pes of t y r es an d rims; in this case, h w -
e er, ap p rop riat e rim/se tio r a tios KI an c eficie ts
K2,a an b wi b esta b lish d an ad e d
-=
i e
rn
*
ran e s in t ab les 1an 2 are r ec mme d d
D ime sions of e xistin rims are spe cifie d in IS0 4 51-3
NO TE 1 Co e (ply ratin ) mark d seri es o f tyr es an rim s
for ag ric l tural tractors an mach ines are sp cifie in
IS04 51-1, I S0 4 51-2 an IS0 4 2 5 1- 5 Serv ic e descrip-
tion (load inde - sp e symbol) m arki n g of the e istin
seri es of ag ric l tural tractor-d riv -wheel tyres is g iv n in
IS0 8664
2 No rma t ive references
The folow in st andards c ont ain p rovisio s w hic ,
t hr ou h r ef er en e in this te t, c nstitute p rovisio s of
t his p art of IS07 6 At th time o f p ub lic at io , th
e itio s in ica t ed wer e vald A ll standards are sub jec t
to re visio n, an pa rties to agre me rs base d o n this
p art of IS0 78 6 7 are e c ourage to inv estiga t e th
p s ibi ty of ap p ly in th most r ec nt e itio s of th
stan ards in ica te b low Memb r s of IEC an IS0
maint ain r egister s o f c r r ently va lid Int ernat io a l Stan-
dards
IS04223-1:1989, Definitio s ofsome terms us d in
the tyre industry - Part1: Pneumatic tyre
IS0 42 5 1 -3: 1994, Tyre (ply ratin marked s rie ) and
rims for agric lturaltractors and mac ine - Part 3:
Rims
IS078 6 7- 2 : 1996, Tyre and rims (metric s rie ) for
agric ltura/tractors and mac ine - Part 2: Service
de criptio andload ratin s
3 Definitio ns
For th p urp oses of this p a rt of IS07 6 , th d f ini-
tio s giv en in IS0 4223-1 and th folow in d f init io
ap ly
3.1 a ric ltural f y r e for spe i al cultiv atio w ork
Tyre f or use o w he ls (usua lly t r a ct or drive wh els)
o n agric ultural mac hin s e ngage d o surf ac e w or k or
lnear c lt iv a t io an th transp r t o n ro ads an trac ks
of th to ls r eq ir ed for suc h work
4 Tyre designation
Th e d sig at io of th t y r e shal b sh w n o its
sid w a llan shal inc lu e th folow in markin s to b e
sh w n c lose toeac ot he
- size an c nstruct io (se 4.11;
- servic e d scriptio (se 4 2)
Trang 6Ri m width cod
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0 0
7.0
8.0 0
9.0
1 0
1 o
12.0
1 0
14.0
1 0
1 0
1 0
20.00
21.o
23.00
25.00
27 00
4 1 S iz e an d co nstructio n
Me surin rim width, R,
mm
63 ,5
, 762
8 ,9
1 0.6
14.3
12 7
19.7
1 2.4
17 8
20 2
2 28,6
25 4
2 7 9,4
3 4.8
3 3 0,2
3 5,6
31
40 4
4 57 ,2
5 8
5 3.4
5 4,2
63 5
6 5.8
The c harac t eristic s shall b in ica te as f olow s:
Nominal
rim diameter
4.1.1 No minal s cti on width
Th e n minal se t io width shal b ex p res e in mi i-
metr es an shal e d in O
4.1.2 Nomina l a pe t rat io
The n mina l asp ec t r a t io shal b e ex p res e as a p er-
ce ntag an shal b a multiple o f 5
4.1.3 Tyre con stru cti on code
Th e tyre c nstruct io c od shal b e as folow s:
- "B" for bias-b elted c onstruc t io ;
- "D" for diago nal/bias c onstruc t io ;
- "R" for radial c nstruct io
NOTE 2 Oth r c od s wi b establi sh ed for n w c n ce ts
(constru tions) of tyr es
4.1.4 No mina l r im diameter cod
For tyres mo nt ed o n 5 " tapere rims, th rim diam-
et er shal b e ex p res e b y a c od f or me with 1 or
2 digits Th e co de shal b as given in ta ble 1
Fo r t y r es re uirin n w c onc ep t rims, for sa f ety
re aso ns e spe cialy c onc ernin mo nt in , th c od
n mb er shal b e e qual to th n minal rim dia meter
ex pres e in an int egra l n mb er of mi imetres, ¡e
f or me b y 3 or 4 digit s
4.1.5 Ri m widt h code
For t y r es mo nt ed o 5 " tapere rims, th r im width
shal b e ex p res e b y a cod e, as given in t a ble 2
For tyres req irin n w c onc ep t rims, ot her c od
n mb ers wi b e establsh d
4.2 S e rvice descriptio n
Th e servic e d sc pt io shallb in ica te as f olow s:
Lo ad in e x Spe d sy mb l
Th c ara cte stics are sp cif ie an d ex p lain d in
IS07 6 -
Table 1- Nomina l r im diameter cod
Nomina l r im diametew Nomina l r im diamet er, Dr
4
6
8
( 9)
1
12
( 3)
14
(1 5)
1
( 7)
1
(1 9 )
2 0
2
2
26
28
3
3 2
3 4
3
3
40
4
4
46
48
5
52
5
1 o
1 2
20
2 9
2 54
30 5
3 3 0
3 5
31
4 0 6
432
457
48
50 8
5 9
6 O
660
711
7 62
8 3
86 4
9 4
965
1 1
1 067
1 1
1 6
121
1 2 7 0
1 21
1 37 2
I 1 Va lue s in par enth s s ar e not e omme d d
I
Tabl e 2 - Ri m width cod
Trang 74.3 Other se rvic c ha ra ct e r¡s t ¡cs
4.3.1 In th case of tu eles ty res, th markin
"TUBE LE SS" shal b sh wn o th t y r e
4.3.2 In th case of a pref er red dir ect io of r ota t io
of th ty re, an a r row shall b use to in ica t e t ha t di-
rect io
4.3.3 Sp ec ific in ic atio s, if req ire , may b e ad e d
to in icate oth r c ha rac t eri t ic s
4.4 T yre clas ifc tionand nome clature
(optional)
A tyre c la ssif ic at io c od - use o f whic is op t io a l
-may d sc rib e th p rima ry field o f a p p lic at io f or th
t y r e
NO TE 3 N om enclatu re an a clas ification c d a re u d r
study
Tyre s me t in th siz e an c nstru tio req ir eme ts
an servic e d sc ptio of this pa rt o f IS0 7 6 shal
b e ma rk d o th sid w a ll as sh w n in th ex amp le
b low
E XAMP LE
A tyre havin
a)
a size an c nstr uct io o
n minal se t io width 4 0 mm,
n minal asp ec t ratio 7 ,
radial c onstruc t io ,
n mina l rim diamet er c od 3 8 ;
bì servic e d scriptio of:
- basic loa d 2 9 0 kg (load in e 14 5)
- ref er en e sp e 4 km/h (sp ee sy mb lA8)
shal b e marke d:
/4 O/tO R 3 145 A I
Inad itio n, oth r servic e C haracte ristics suc h as t ub e-
les shal b mark d:
I T UB L S I
B S AU 60 : Part 1 : Subs ectio n 4.5a : 1996
6 Tyre d i m en sion s
6.1 Calc lation of"de ign tyre" dime nsions
6 1 1 Theoretical rim widt h, Rt h
Th th oretical rim w idth, R, is eq ual to th p rod c t
of th n mina l se tio w idth, S , an th rim/se tio
ratio , KI:
Ra = K~SN
Fo r f a ctor K I,se e table 3
6.1.2 Measuring rim widt h, R,
Th e mea surin r im w idth, R, is th width of t he
stan ardiz e d r im n arest o th t he r et ic l rim w idth,
Rt h (se t a ble 2 and an e A )
6.1.3 De i g n tyr e s cti on width, S
Th e d sig tyre se tio w idt h, S, is a n minal sec t io
w idth, S , t r a nsf err ed from th t he r et ica l r im, i+to ,,
th mea surin rim w idth, R,:
s = SN + K2(Rm - &,
ro n e to th n arest wh le n mb er
For f a ctor K2,se e table 3
6 1.1 De i g n t yr e s ction height, H
Th e d sig tyre se tio h ig t, H, is e qual to th pro -
d ct o f t he n minal se tio w idth, SN, an th no minal
aspe ct ratio, H/Sdivid d b 100:
ro n e to th n arest wh le n mb er
6.1.5 De i gn tyre overal diameter, Do
Th e d sig tyre o ve ral diamet er, Do, is th sum of t he
n minal rim diameter, D, p lus twic th d sig tyre
se t io h ig t, H:
Do=D,+2H
For th se tyres usin a rim diamet er c od f orme b 1
or 2 digits, se e t able 1 for th valu of D, in mi -
met r es, to b e use d
Trang 8BSI BS*AU*SO:PTL :SUBSEC*4-5A 96
U
1624669 0564336 972 =
BS AU 60 : Part 1: Subs ectio n 4 6a :1996
6 2 Calculation of "minimum o veral ty r e
dime sions"
6.2.1 Minimum ov ral widt h, Wmin
The minimum overall w idth, Wmi n, is eq ual to th pro d-
u t o f d sig tyr e se tio width, s, an th ap ro -
p at e c ef f icie t , c (se t ab le 3):
Wm l n = s
6.2.2 Minimum ov ral diameter, Do, ¡
Th e minimum overall diamet er, Do, , , in , is e qual toth
n minal rim diameter,
Dr,
p lus twic th pr od ct of
d sig tyre se tio h ig t, H,
an th a p p rop riat e
c ef f icie t, d (se t ab le 3):
(b ias-b elt ed, dia go a lbia s an radial c nst r uctio ) with
n minal aspe ct ratio H/S b 5 0 mo nt ed o 5 " tapere
rims, th c eficie ts for th c a lc ulatio of ty r e di-
me sio s shal b e as given in t able 3
Table 3 - Coeficie ts fo r c lc lation of tym
dime sions
I Bia s-belt edl B
I 0.8I 0,4 I 1,0811.0 IO.9 l 0,97 1
D iago nal I D 0.8I0.4 11 ,O8 I 1 O7 [ 0,9 I 0,9
IRad ial
I
R I0,8 I0.4 I 1 ,O I 1 ,o4 I 0,9 I 0 ,9 7 I
I
1) F ig r e is ba e on re gula r s r v ic tyre T he u e r s ould re-
c og iz e th t d ep tr ea s a d corre sp n in in r ea e o ve rall
I diameters ma be u e for c r tain sp e cia liz e d ty r es
For t y r es H S < 5 and /or difere t c onc ept yr es an
rims, ot her c eficie ts wi b d f in d
6 3 Calculatio n of "maximum o veral ty r e
dimen sions in servic "
This c alc ulat io is f or use b vehic le manuf ac t urers in
d sig in for tyre cle aran e
6 3 1 Ma ximum overal widt h in s rvice, W,
The maximum overall width in se rvice , Wmax, is e qual
to th prod ct of h d sig tyre se t io w idth, S, an
th a p p rop riat e c ef f icie t, u (se table 3):
w, = su
It inc lu es prot ectiv e ribs, lett erin , emb el shme ts,
manuf ac turin t oleranc es an grow th d ue to se rvice
6.3.2 Ma ximum overal diameter ins rvice, Do,
Th ma ximum overall diameter in servic e, DO,mx, is
e qual to th n minal rim diameter, D, p lus twic th
prod ct of th d sig tyr e se tio h ig t , H, an th
ap ro priate c ef f icie t ,b (se t a ble 3):
Do.ma ,
=
Dr+
mb
It inc lu es ma nuf ac turin toleranc es, th difere t
t y pes o f t r ea d pat t r ns (se fo tn te to ta ble 3) an
gr ow th d e to servic e
6 4 Coeficie ts for calculatio n of ty r e
d i m en sion s
For al ty pes o f ty r es (for t r a ctor drive, tract or st ee
impleme t an garde n tr actor w he ls) o f al str uct ures
7 T yre dimensions
For th relevant dime sio s of t y r es (metric series)
for t r a ctio w he ls an ste r i g w he ls o f agric l-
tur a l tract or s an mac ine s, an for agric ultural im-
pleme t s, se an e A
8 Methodo f measurement of tyre
Bef ore b ein me asure d, th tyre shal b mo nte o n
its measurin rim, inflate with air or nit r og n to th
rec mme d d pre ssure , an a llow ed to st and f or a
minimum o f 2 h at n rmal ro m t emp ra ture, a f t er
wh ic th inf lat io pr es ur e shal b readjust ed to th
original valu
9 Tyre and rim coordination
9 1 Approv d r imwidt hs
For al t y pes o f t y r es (for t r a ctor drive, t r a ctor steer,
impleme t an garde n t r a ctor w he ls) of al str uct ures
(b ia s-b elt ed, diago nal/bias an radial c nstr uct io )
mo nte o n 5" tapere rims, th c eficie ts fo r th
c alc ulat io o f ap ro ve d rimw idths shal b e as given in
ta ble 4 Th e value s shal b e rou d d to th ne are st
stan ardiz e d rim fr om th fir st c lumn of t ab le 2
Trang 9B SI BS%AU*5 :PTL :SUBSEC*4.5A 9b m Lb24bb9 05b4LL7 809 m
B S AU 50 : P a r t 1 : Su bse c ti on 4 6a :1996
Table 4 - co eficie ts for calc lation of ap p ro ed
rim widths
For minimum and max imum approve rim width fo r
sta d rdize nominal ty r e sections, s e a n x B
Aspe t r atio, H I S %
9 to 7
Ri m width
ma ximum
1) Fo r tyres with HS= 9 an HS6 6 5 an lor diferent co
-c ep t tyre an d ri m s, o t her coe ff icie nt s may b de fine d
For approve rim co nto urs for ra g s o f e istin t yres ,
see a n x C
Trang 108
8
9 6
104
1 2
12 0
12 8
1 6
-1 8
176
1 4
1 2
2 0 0
2 0 8
216
2 2 4
232
2 4 0
256
27 2
288
30 4
32 0
3 6
3 2
3 8
38 4
40
4 6
43 2
4 8
4 4
4 0
49
52 0
54 4
5 8
-Anne x A
(norma tiv e)
7 5
-8
9
9
1 5
1 3
12 0
12 8
-173
18 0
188
1 5
20
2 1 0
218
2 2 5
2 4 0
25
2 7 0
285
30 0
31 5
3 0
34 5
3 0
37 5
3 0
4 0 5
4 2 0
43 5
4 0
465
48
510
5 3
5 3
-Nomina l
s ctio
w idth
S
mm
1 O0
1 0
120
1 0
14 0
1 5
1 0
170
1 0
1 9
2 0 0
21o
2 2 0
230
2 0
2 50
2 60
27 0
2 8 0
2 90
30 0
3 20
34 0
3 60
38 0
40
4 0
4 4 0
460
4 0
50 0
52 0
54 0
5 0
580
6 00
620
6 0
68
71O
75 0
8 0
85 0
900
Me as urin
rim w idth
c d
3.0
3.5
4.0
4.0
4.5
4.5
5.00
5.5
5.5
6.00
6.00
7.0
7.0
7.0
8.0
8.0
8.0
9.0
9.0
9.0
9.0
1 0
1 o
1 o0
12.0
1 0
1 0
14.0
14.0
1 0
1.0
16.0
17.0
1 0
1 0
1 0
20.0
20.0
21.o 0
23.0
23.0
25.0
27 00
2 0
Section
w idth
S
9 8
1 0
12
129
141
148
1 0
171
17 8
1 0
1 7
214
21
22 8
24 4
25
258
27 5
282
289
2 95
3 9
34 3
3 7
38 0
404
418
41
4 55
4 7 9
503
5 6
54 0
5 4
57 7
51
6 25
,64 5
6 76
716
7 4
7 98
852
8 6
lyre d sig dime sions, mm
Section h ig t, H, at no mina l a pe t r atio HlS(Y )
9
90
9
1 8
1 7
126
1 5
1 4
1 3
1 2
171
180
1 9
1 8
207
216
2 25
2 34
2 3
2 52
26
2 0
2 8 8
30 6
3 24
-8
8
9 4
1 2
1 1
1 9
128
16
145
1 3
1 2
170
179
1 7
1 6
204
21
2 1
2 30
2 38
24 7
255
27 2
2 8 9
30 6
-70
-84
9
9
1 5
1 2
1 9
-175
i82
1 9
1 9 6
20
21o
2 4
2 38
252
2 66
2 8 0
294
30 8
32 2
3 6
3 5 0
3 64
37 8
3 2
4 0 6
4 0
434
4 55
4 7 6
49 7
52 5
5 0
-6 5
-8
9
9
104
1 1
-176
1 2
1 9
1 5
2 0 8
2 1
234
2 4 7
2 60
27 3
286
299
3 2
3 25
3 3 8
31
3 64
37 7
3 90
4 0 3
4 2 3
4 2
462
4 8 8
52 0
5 3
-17 4
180
1 2
2 0 4
216
2 2 8
2 4 0
252
264
2 6
2 8 8
30 0
3 2
32 4
3 6
34
3 0
37 2
3 90
40
4 2 6
4 50
48
5 O
54 0
-176
1 7
1 8
20
22 0
23
24 2
25
2 8 4
2 5
28
297
308
3 9
3 0
34 1
3 8
37 4
31
413
4 4 0
468
4 95
-5
-80
8
-180
1 0
200
21o
22 0
230
24 0
2 50
2 60
2 7 0
2 80
290
300
3 O
32 5
34 0
3 5
37 5
4 0 0
4 2 5
4 50
-NOT - These vl ues s e rv as a g ide lin for de s ig of tyre dime nsio ns , metric seri es, for tyres mo unte d o '5 ta e re d dr opce tr e r ims
(co de des ig ate ci)