ISO 7902-2:1998

Hydrodynamic plain journal bearings under steady-state conditions — Circular cylindrical bearings — Part 2: Functions used in the calculation procedure

Paliers lisses hydrodynamiques radiaux fonctionnant en régime stabilisé — Paliers circulaires cylindriques — Partie 2: Fonctions utilisées pour le calcul

Hidrodinamični radialni drsni ležaji za neprekinjeno obratovanje - Valjasti ležaji - 2. del: Funkcije, uporabljene za dimenzioniranje

General Information

• Status: Withdrawn
• Publication Date: 29-Apr-1998
• Withdrawal Date: 29-Apr-1998
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISO/TC 123/SC 8 - Calculation methods for plain bearings and their applications
• Drafting Committee: ISO/TC 123/SC 8 - Calculation methods for plain bearings and their applications
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 05-Jun-2020
• Ref Project: SIST ISO 7902-2:2002 - Hydrodynamic plain journal bearings under steady-state conditions -- Circular cylindrical bearings -- Part 2: Functions used in the calculation procedure

Relations

• Revised: ISO 7902-2:2020 - Hydrodynamic plain journal bearings under steady-state conditions — Circular cylindrical bearings — Part 2: Functions used in the calculation procedure
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL
- STANDARD
First edition
1998-05-01
Hydrodynamic plain journal bearings under
steady-state conditions - Circular
cylindrical bearings -
Part 2:
Functions used in the calculation procedure
Paliers lisses hydrodynamiques radiaux fonctionnant en rkgime stabilisk -
Paliers circulaires cylindriques -
Partie 2: Fonctions utiliskes pour le calcul
Reference number
IS0 7902-2: 1998(E)

---------------------- Page: 1 ----------------------
IS0 7902-2: 1998(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 7902-2 was prepared by Technical Committees
lSO/TC 123, Plain bearings, Subcommittee SC 4, Methods of calculation of
plain bearings.
IS0 7902 consists of the following parts, under the general title
Hydrodynamic plain journal bearings under steady-state conditions -
Circular cylindrical bearings:
- Par? 1: Calculation procedure
- Part 2: Functions used in the calculation procedure
- Part 3: Permissible operational parameters
Annex A of this part of IS0 7902 is for information only.
0 IS0 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central @ iso.ch
c=ch; a=400net; p=iso; o=isocs; s=central
x.400
Printed in Switzerland
ii

---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD @ IS0
IS0 7902-2: 1998(E)
Hydrodynamic plain journal bearings under steady-state
- Circular cylindrical bearings -
conditions
Part 2:
Functions used in the calculation procedure
1 scope
This part of IS0 7902 specifies the values of the basic functions used in the calculation procedure for oil-lubricated
circular cylindrical hydrodynamic bearings under conditions of full lubrication.
The values are given for the assumptions and boundary conditions given in IS0 7902-l. The values necessary for
the calculation may be determined from the tables of bearing characteristics, the graphs and from the equations.
The descriptions of the symbols used and calculation examples are given in IS0 7902-I.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
IS0 7902. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of IS0 7902 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid
International Standards.
IS0 3448: 1992, Industrial liquid lubricants - IS0 viscosity classification.
IS0 7902-I : 1998, Hydrodynamic plain journal bearings under steady-state conditions - Circular cylindrical
bearings - Part 1: Calculation procedure.
3 Tables of basic bearing characteristics
Tables 1 to 30 give
- the attitude angle, p,
- The Sommerfeld number, So,
- the specific coefficient of friction, taking account of the unloaded area of lubricant film, j”/y,
- the specific coefficient of friction in the loaded area of the lubricant film, f/y,
- The coefficient of lubricant flow rate, parameter Q&due to generation of the internal pressure, as a function of
angular span, L2, relative eccentricity E and relative bearing width B/D,
for various values of E, L2 and B/D.
1

---------------------- Page: 3 ----------------------
IS0 7902-2: 1998(E) @ IS0
Table 5 - Values of the basic characteristics for
Values of the basic characteristics for
Table 1 -
fl = 360” and B/D = 0,5
Q = 360” and B/D = I,5
so
E
B Q;
4,968 4 0,0477 75,8188 0,7788
72,5236 0,4273 7,5992 02
02
3,6035 2,6582 0,0935 61,7628 0,2026
62,6588 I,0005 W
084
I,9724 2,2272 I,6695 OJ361 47,9703 0,4995 8,0837 1 5,8561 1 0,0703
51,9692 05
W3
4,6824 I,3653 I,0736 0,1759 32,9653 I,74 3,2267 2,3698 0,0938
38,1601 03
03
lo,1382 0,921 8 0,7604 ~ 0,1939 23,5037 5,1579 I,5768 I,2604 0,1054
27,961 03
a9
I I
13,8256 0,7906 0,6678 0,198 0,925 20,317l 7,9168 1,205 1 0,992 1 0,1082
0,925 24,6184
0,95 19,8007 22,044 0,6173 0,5359 0,201 0,95 16,5292 14,1757 0,8449 0,7198 0,1107
0,2036 0,975 II,7164
0,975 13,597 1 48,8429 0,404 0,3586 36,438 0,487 0,415 OJl28
I I
Table 6
Table 2 - Values of the basic characteristics for - Values of the basic characteristics for
i2= 360” and B/D = 1.25 a = 360” and B/D = 0,25
h
E so E so
flw
f 'M Q,’ .m Q’
I
0,0444
73,3427 0,341 9,4978 6,201 6 02 75,8522 0,0209 153,245 99,5571 0,0123
02
3,2457 0,0876 61,4843 0,056 61,5567
62,6533 0,8155 4,3808 0,4 41,8879 0,0246
0,4
1,671 5 2,5837 I,9257 0,1287 47,4076 0,146 27,1065
51,3901 016 18,7058 0,0368
03
I,1285 0,1679
37,2474 4,2107 I,4855 018 31,2896 0,6053 8,8577 6,396 1 0,049 2
03
0,794 9 0,186O 21,531 5 2,2037
27,2701 9,462 1 0,9678 019 3,4356 2,6972 0,0553
03
0,925 13,0839 0,8197 0,690 0 0,190l 0,925 18,5306 3,6707 2,399 4
23,958 6 I,9424 0,0568
0,95 19,3045 21,1271 0,6332 0,5484 0,1936 0‘95 15,078 713466 1,493 1 I,2546 0,0582
0,975 13,3154 47,5332 0,4097 0,3631 0,1959 0,975 IO,7792 22,6665 0,7149 0,5632 0,0595
Table 3 - Values of the basic characteristics for Table 7 - Values of the basic characteristics for
0 = 360” and B/D = 1 52 = 180°C and B/D q 1,5
E so E so
B B f 'Iti
Q’
74,208 0,2492 12,958 8,4489 0,039 4 66,6767 0,3781 8,571 8 4,5565 0,0385
02 02
62,5744 0,611 5,7868 4,2721 0,0785 54,2395 0,871 1 4,0972 2,4424 0,0628
0,4 Of4
50,4545 I,3182 3,2102 2,3761 0,1164 44,2171 I,7528 2,4496 1,6803 0,0755
08 016
0,1533
36,0278 3,5955 1,691 5 I,2766 32,582 4,3531 I,4182 I,1391 0,075
03 03
8,5203 I,0457 0,8537
26,3685 0,1708 24,256 9,6987 0,916 1 0,796 0,0675
Or9 03
23,0726 12,0342 0,8682 0,7275 0,1748 0,925 21,5177 13,4451
0,925 0,7846 0,6782 0,0632
19,799 0,659 9 0,5696
0,95 18,6392 0,1783 0,95 18,6557 20,5259 0,6423 0,5495 0,0589
12,9388 45,5721 0,4193 0,371 0,1808 0,975
0,975 12,6652 47,2761 0,4059 0,3701 0,050l
I
Table 4 - Values of the basic characteristics for Table 8 - Values of the basic characteristics for
D q 360” and B/D = 0,75 Q = 180” and B/D = I,25
E so E so
B f 'I* B f 'Iti
Q,’ Q’
0,1584 13,237;
75,022 20,390: 0,3255 67,7085 0,3106 10,415E 5,5146 0,0369
02 02
62,2584 0,3993 8,7606 6,183
0,065 55,2027 0,7326 4,8431 2,8666 0,061 5
014 0,4
49,355 4 0,9155 4,5167 3,3161 0,0972 44,3642
0,6 0,6 1,531 2 2,7744 1,893 1 0,0748
34,5144 2,7848 2,1067 I,5712 0,1292 32,449 1 3,981 9
03 03 I,5296 I,2248 0,0747
25,1887 7,1614 I,1979 0,9696 0,1447 24,0337 9,227 9
03 03 0,9643 0,822 0,0682
0,925 21,8823 10,461 1 0,9627 0,801 0,1483 0,925 21,247
12,8584 0,8106 0,7075 0,0642
0,95 17,739 3 17,7363 0,711 9 0,611 4 0,151 6 0,95 18,433 19,947 1 0,6549 0,0601
0,5589
0,975 12,4264 42,3829 0,4384 0,3869 0,153 0,975 12,3471 46,7535 0,4066 0,3706 0,0507

---------------------- Page: 4 ----------------------
0 IS0
IS0 7902-2: 1998(E)
Table 13 - Values of the basic characteristics for
Table 9 - Values of the basic characteristics for
i2 = 180” and B/D = 1 Q = 150” and B/D = 1,5
E
Q; Q’
f ‘I@
61,7703
69,0182 0,2328 13,868 7,3068 ON0338 02 0,3058 10,574 4,7678 0,3288
02
3,6873 0,0575 47,9337 0,738 4,7933
56,4093 0,560-i 6,2861 0,4 2,489 0,0445
Of4
I,2448 3,3652 2,2797 0,0729 39,8508 I,5547 2,7181 1,659 9
44,589 05 0,0521
03
32,3681 3,4514 I,7312 1,379 9 0,0735 30,2152 4,061 6 I,4905 I,1082 0,0501
03
03
23,7701 8,4037 1,039 0,906 1 0,0679 23,4459 9,2073 0,961 8 0,771 2 0,0437
03
03
II,9405 0,8574 0,7446 0,064 0,925 20,432 13,0508 0,794 9 0,6551 0,0403
0,925 20,898 1
18,1351 18,5775 0,691 0,589 4 0,0601 0,95 17,262 20,569 9 0,6301 0,525 0,0365
0,95
0,975 11,901 7 45,771 0,4094 0,3754 0,051 3 0,975 12,396 46,5565 0,4083 0,35 0,0325
Values of the basic characteristics for Table 14 - Values of the basic characteristics for
Table 10 -
Q = 150” and BID = I,25
fl= 180” and B/D = 0,75
E SO
Q;
I I
70,5349 0,151 3 0,0289
02
0,0513
57,8558 0,381
084
0,066
45,0124 0,8883
05
2,6987 0,0698
32,3128
018
23,3367 7,1375 0,0649
03
0,925 20,4384 IO,4252 0,061 7
0,95 17,5793 16,7465 0,058 0,95 17,1592 19,8337 0,6474 0,5425 0,0375
0,975 II,2948 43,5128 0,051 3 0,975 12,2987 45,3826 0,4154 0,3705 0,0334
- Values of the basic characteristics for Table 15 - Values of the basic characteristics for
Table 11
0 = 150” and B/D = 1
s1= 180” and B/D = 0,5
E so
E
B 1 so 1 f'/ti 1 f/ll/ 1 Q; P f 'I$ fl*
Q’
I
72,293 9 0,0747 43,011 7 22,402E 0,021 3 64,1708 0,2022 15,945 s 7,1228
02 02 0,0268
58,1928 0,2002 17,289 7 9,961 0,0394 50,1904 0,509 9 6,8759 3,51 0,0434
0,4 014
45,697 1 0,49 8,2284 5,451 8 0,0522 41,1351 I,1434 3,631 8 2,1757 0,0526
08 Q6
31,5756 I,7222 3,2498 2,5502 0,0573 30,2445 3,2967 I,7897 I,3189 0,051 1
03 018
22,246 5,1676 I,5666 I,3352 0,0547 22,9634 8,0787 I,0677 0,8862 0,045
03 03
0,925 19,751 4 7,8436 I,2104 1,039 0,053 0,925 20,115 1 I,5986 0,871 9 0,7488 0,041 9
0,95 16,5935 13,852 0,862 0,741 9 0,0508 0,95 16,9465 18,7837 0,6741 0,5636 0,0383
0,975 10,769 1 38,055 0,4601 0,412 0,0451 0,975 12,1844 43,3026 0,4294 0,376 0,0339
Table 12 - Values of the basic characteristics for Table 16 - Values of the basic characteristics for
52 = 180” and B/D = 0,25 Q = 150” and B/D = 0,75
E so E so
f 'I$ fl* B
B f 'I* f/v I Q’
I I
I,
169,077 87,621 0,011 65,961 1 0,1367
73,936 4 0,019 02 23,553 10,449 c 0,0238
02
0,0537 64,0354 36,513 0,0214 51,9963 0,3561
59,6743 0,4 9,7827 4,9274 0,04
0,4
45,5631 0,1465 27,0145 16,989 0,0295 42,1174 0,8372 4,891 8 2,8877
0,6 0,05
05
0,6054 8,8522 6,0472 0,0339 30,6367 2,6068
30,5214 03 2,211 I,6154 0,0497
03
21,4482 2,172 5 3,4821 2,7036 0,0334 22,6695 6,9438 I,2114
03 I,0008 0,0443
02
19,5175 3,461 7 2,543 2,011 9 0,0332 0,925 19,8534 IO,1662 0,9704
0,925 0,8155 0,041 5
0,95 14,9385 7,3485 I,4916 I,2603 0,0321 0,95 16,681 2 16,940 9 0,7302 0,608
0,0382
0,975 9,461 7 23,4266 0,6837 0,5668 0,029 9 0,975 II,9044 40,5953 0,4488
0,3809 0,0337

---------------------- Page: 5 ----------------------
ISO 7902-2: 1998(E)
@ IS0
Table 21 - Values of the basic characteristics for
Table I7 - Values of the basic characteristics for
Sz = 120” and B/D = 1
LI = 150” and B/D = 0,5
E fw
f 'I* Q,’
45,4882 20,028: 0,0184
67,982 1 0,0706
02
0,1899 18,2097 9,021 1 0,0323
0,4 54,2896
43,0078 0,4775 8,4291 4,9152 0,041 2
05
Of0431
30,3047 I,6927 3,2951 2,3785
03
22,1859 5,0335 I,6018 1,293 0,0402
03
1,022 0,0385
0,925 19,66 7,5834 1,246
0,8946 0,7383 0,0361 0,95 16,1452 18,0536 086894 0,541 8 0,0225
0,95 16,3781 13,2552
0,501 2 0,4245 0,031 7 0,975 12,4702 39,7924 0,4606 0,3896 0,0197
0,975 II,4673 34,9703
Table 22 - Values of the basic characteristics for
Table 18 - Values of the basic characteristics for
Q = 120” and BID = 0,75
52 = 150°C and B/D = 0,25
\
/
E E so
f 'I* Q
1 f'/+ 1 .fllc/ 1 Q’ 1
I I B I so
75,891 2 0,0099 61,3045 0,1102 29,1962 10,540: 0,0175
02
31,701 1 0,0185 45,8179 0,301 II,5302 4,8583 0,0277
0,4 0,4
15,6846 0,0248 37,1249 0,7471 5,4372 2,7565 0,0328
03 05
6,3433 0,0269 27,9978 2,4401 2,3336 I,5185 0,031 8
0,s W3
2,611 2 0,0259 0,9 21,1836 6,6561 I,2454 0,9561 0,0273
03
I,9114 0,0251 0,925
0,925 18,901 5 9,7602 0,9969 0,7665 0,0255
I,2701 0,0244 0,95 15,9688 16,4057
0,95 0,744 0,5905 0,0229
0,631 5 0,0221 0,975
0,975 12,3551 37,1528 0,4849 0,401 0,0202
Table 23
Table 19 - Values of the basic characteristics for - Values of the basic characteristics for
0 = 120” and B/D = 1,5 Q = 120” and B/D q 0,5
E E so
B B
Q’ 1 f'M 1 fl+ 1 Q'
14,682: 5,3943 0,0195 63,7072 0,061 1
56,6763 0,2196 02 52,602 18,817 3 0,0144
02
0,5536 6,3258 2,7433 0,0284 48,3597 0,171 3 20,155f
42,0362 Ot4 8,3305 0,0238
0,4
34,5662 I,2672 3,2692 I,7133 0,0335 39,0125 0,4446 9,021 4 0,0295
W3 08 4,4692
27,0973 3,6108 I,6323 I,0858 0,0308 27,961 I,6413 3,3776 2,1664 0,029 7
03 03
21,2301 8,7261 0,988 9 0,768 0,0254 20,901 3 4,956 1 I,6148 I,2272 0,0263
03 03
0,925 19,1732 12,2582 0,8264 0,6673 0,0235 0,925 18,9454 7,4106 I,2659 0,9624 0,025
0,95 16,2459 19,7605 0,642 0,5148 0,0209 0,95 15,6856 13,2503 0,8878 0,691 3 0,0227
0,975 12,5263 42,6121 0,4375 0,3537 0,0181 0,975 1 I,9048 31,9505 0,5481 0,4365 0,019 9
Table 20 - Values of the basic characteristics for Table 24 - Values of the basic characteristics for
fl= 120°C and B/D = I,25 J2 = 120” and B/D = 0,25
E so E so
f 'I* .fw Q 3’ B f 'M m
b I I Q’
58,2103 0,1848 17,438: 6,371 7 0,019 1 02 66,2399 0,0169 190,0235 67,3268 0,0082
02
42,953 0,4869 7,1767 3,091 1 0,0287 0,4 51,432 0,0507 67,7051 27,357 0,0148
Ot4
35,0689 I,1449 3,6023 I,8732 0,0338 06 41,1596 0,1387 28,511 7 13,7269 0,019
W3
27,2067 3,3665 I,7382 I,1514 0,031 3 W3 28,6466 0,5892 9,0777 5,6831 0,0199
03
21,2163 8,3078 I,0304 0,7984 0,0263 03 20,7885 2,1244 3,5523 2,5177 0,0185
019
0,925 19,068 1 II,7869 0,8526 0,691 1 0,0243 0,925 17,9741 3,5485 2,4728 I,8782 0,0176
0,95 I,,1962 19,0952 0,6594 0,5305
0,0223 0,95 14,8377 7,0378 1,551 2 I,1951 0,0165
0,975 12,497 1 41,1775 0,4488
0,3751 0,0189 0,975 II,0159 20,7702 0,7739 0,6091 0,0153

---------------------- Page: 6 ----------------------
@ IS0
IS0 7902-2: 1998(E)
Table 25 Table 28 - Values of the basic characteristics for
- Values of the basic characteristics for
L! = 90” and B/D = 0,75
$2 = 90” and B/D = I,5
& so & so
B
B f ‘Iti .flll/ Q; f ‘Iti I ?r----T
I Q’
02 53,3402 0,1176 27,355 7,6276 0,011 4 56,944 4 0,0724 44,3583 12,206t 0,010 9
02
Of4 37,1665 0,3301 IO,5034 3,54 0,0159 40,2697 0,2094 16,4973 5,433 2 0,0163
Or4
I,9758 0,0174
016 28,9167 0,8642 4,6881 053 30,87 0,5746 6,9886 2,8638 0,0185
I,9746 I,1041 0,0151
03 23,2037 2,881 7 24,1523 2,0933 2,6649 I,4568 0,0171
03
0,0125
03 18,831 5 7,6366 1,089 0,7487 18,9534 6,0576 1,336 0,9064 0,0143
02
17,1845 II,0261 0,8865 0,6235 0,011 5 0,925
0,925 17,1651 9,0204 I,0531 0,7373 0,0132
0,95 14,8237
15,3757 0,7759 0,578 0,011 7
0,975 II,44 36,0784
0,488 0,3878 0,0103
- Values of the basic characteristics for Table 29
Table 26 - Values of the basic characteristics for
LZ = 90” and B/D = I,25 fl = 90” and B/D = 0,5
-
.
so &
&
B f '/I(/ fl$ B f 'Iti 1 f/$
Q,’ Q,’
30,061 7 8,3605
02 54,1165 0,1069 0,011 5 02 59,758 73,56 20,031 t 0,0096
37,6101 0,3074 11,266 3,786 0,0161 42,7063
0,4 26,0987 8,4393 0,015l
09
29,1984 0,8OC8 5,05 2,1145 0,0178 32,766 10,686 4,2761 0,0176
05 03
23,3782 2,719 2,0844 I,1605 0,0158 24,8677 3,7338 2,0008 0,0168
03 Or8
18,857 7,3176 I,1304 0,7752 0,013l 19,1302 I,7054 I,1418 0,0143
o,g 03
0,925 17,2396 IO,5982 0,9172 0,6451 0,0121 0,925 17,1373 I,2942 0,8704 0,0132
0,95 14,908 17,5885 0,6942 0,519 0,011 0,95 14,7154 0,9136 0,6752 0,011 8
,
0,975 11,511 7 39,9392 0,451 3 0,3601 0,009 9 0,975 11,271 1 0,5438 ~ I 0,4308 0,0103
Table 27 - Values of the basic characteristics for Table 30 - Values of the basic characteristics for
0 = 90” and B/D = 1 0 = 90” and B/D = 0,25
.
* I
E so
P .f Iti f/II/ Q,’
55,8145 0,089 3 35,979 9,9463 0,011 2 62,8374 0,0137 234,859 63,203 0,006l
02 02
38,6932 0,266 13,010 4,335 0,0163 46,171 9 0,0435 79,0197 24,894 0,0103
0,4 Of4
2
...

SLOVENSKI STANDARD
SIST ISO 7902-2:2002
01-marec-2002
+LGURGLQDPLþQLUDGLDOQLGUVQLOHåDML]DQHSUHNLQMHQRREUDWRYDQMH9DOMDVWLOHåDML
GHO)XQNFLMHXSRUDEOMHQH]DGLPHQ]LRQLUDQMH
Hydrodynamic plain journal bearings under steady-state conditions -- Circular cylindrical
bearings -- Part 2: Functions used in the calculation procedure
Paliers lisses hydrodynamiques radiaux fonctionnant en régime stabilisé -- Paliers
circulaires cylindriques -- Partie 2: Fonctions utilisées pour le calcul
Ta slovenski standard je istoveten z: ISO 7902-2:1998
ICS:
21.100.10 Drsni ležaji Plain bearings
SIST ISO 7902-2:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 7902-2:2002

---------------------- Page: 2 ----------------------

SIST ISO 7902-2:2002
INTERNATIONAL
- STANDARD
First edition
1998-05-01
Hydrodynamic plain journal bearings under
steady-state conditions - Circular
cylindrical bearings -
Part 2:
Functions used in the calculation procedure
Paliers lisses hydrodynamiques radiaux fonctionnant en rkgime stabilisk -
Paliers circulaires cylindriques -
Partie 2: Fonctions utiliskes pour le calcul
Reference number
IS0 7902-2: 1998(E)

---------------------- Page: 3 ----------------------

SIST ISO 7902-2:2002
IS0 7902-2: 1998(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 7902-2 was prepared by Technical Committees
lSO/TC 123, Plain bearings, Subcommittee SC 4, Methods of calculation of
plain bearings.
IS0 7902 consists of the following parts, under the general title
Hydrodynamic plain journal bearings under steady-state conditions -
Circular cylindrical bearings:
- Par? 1: Calculation procedure
- Part 2: Functions used in the calculation procedure
- Part 3: Permissible operational parameters
Annex A of this part of IS0 7902 is for information only.
0 IS0 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central @ iso.ch
c=ch; a=400net; p=iso; o=isocs; s=central
x.400
Printed in Switzerland
ii

---------------------- Page: 4 ----------------------

SIST ISO 7902-2:2002
INTERNATIONAL STANDARD @ IS0
IS0 7902-2: 1998(E)
Hydrodynamic plain journal bearings under steady-state
- Circular cylindrical bearings -
conditions
Part 2:
Functions used in the calculation procedure
1 scope
This part of IS0 7902 specifies the values of the basic functions used in the calculation procedure for oil-lubricated
circular cylindrical hydrodynamic bearings under conditions of full lubrication.
The values are given for the assumptions and boundary conditions given in IS0 7902-l. The values necessary for
the calculation may be determined from the tables of bearing characteristics, the graphs and from the equations.
The descriptions of the symbols used and calculation examples are given in IS0 7902-I.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
IS0 7902. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of IS0 7902 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid
International Standards.
IS0 3448: 1992, Industrial liquid lubricants - IS0 viscosity classification.
IS0 7902-I : 1998, Hydrodynamic plain journal bearings under steady-state conditions - Circular cylindrical
bearings - Part 1: Calculation procedure.
3 Tables of basic bearing characteristics
Tables 1 to 30 give
- the attitude angle, p,
- The Sommerfeld number, So,
- the specific coefficient of friction, taking account of the unloaded area of lubricant film, j”/y,
- the specific coefficient of friction in the loaded area of the lubricant film, f/y,
- The coefficient of lubricant flow rate, parameter Q&due to generation of the internal pressure, as a function of
angular span, L2, relative eccentricity E and relative bearing width B/D,
for various values of E, L2 and B/D.
1

---------------------- Page: 5 ----------------------

SIST ISO 7902-2:2002
IS0 7902-2: 1998(E) @ IS0
Table 5 - Values of the basic characteristics for
Values of the basic characteristics for
Table 1 -
fl = 360” and B/D = 0,5
Q = 360” and B/D = I,5
so
E
B Q;
4,968 4 0,0477 75,8188 0,7788
72,5236 0,4273 7,5992 02
02
3,6035 2,6582 0,0935 61,7628 0,2026
62,6588 I,0005 W
084
I,9724 2,2272 I,6695 OJ361 47,9703 0,4995 8,0837 1 5,8561 1 0,0703
51,9692 05
W3
4,6824 I,3653 I,0736 0,1759 32,9653 I,74 3,2267 2,3698 0,0938
38,1601 03
03
lo,1382 0,921 8 0,7604 ~ 0,1939 23,5037 5,1579 I,5768 I,2604 0,1054
27,961 03
a9
I I
13,8256 0,7906 0,6678 0,198 0,925 20,317l 7,9168 1,205 1 0,992 1 0,1082
0,925 24,6184
0,95 19,8007 22,044 0,6173 0,5359 0,201 0,95 16,5292 14,1757 0,8449 0,7198 0,1107
0,2036 0,975 II,7164
0,975 13,597 1 48,8429 0,404 0,3586 36,438 0,487 0,415 OJl28
I I
Table 6
Table 2 - Values of the basic characteristics for - Values of the basic characteristics for
i2= 360” and B/D = 1.25 a = 360” and B/D = 0,25
h
E so E so
flw
f 'M Q,’ .m Q’
I
0,0444
73,3427 0,341 9,4978 6,201 6 02 75,8522 0,0209 153,245 99,5571 0,0123
02
3,2457 0,0876 61,4843 0,056 61,5567
62,6533 0,8155 4,3808 0,4 41,8879 0,0246
0,4
1,671 5 2,5837 I,9257 0,1287 47,4076 0,146 27,1065
51,3901 016 18,7058 0,0368
03
I,1285 0,1679
37,2474 4,2107 I,4855 018 31,2896 0,6053 8,8577 6,396 1 0,049 2
03
0,794 9 0,186O 21,531 5 2,2037
27,2701 9,462 1 0,9678 019 3,4356 2,6972 0,0553
03
0,925 13,0839 0,8197 0,690 0 0,190l 0,925 18,5306 3,6707 2,399 4
23,958 6 I,9424 0,0568
0,95 19,3045 21,1271 0,6332 0,5484 0,1936 0‘95 15,078 713466 1,493 1 I,2546 0,0582
0,975 13,3154 47,5332 0,4097 0,3631 0,1959 0,975 IO,7792 22,6665 0,7149 0,5632 0,0595
Table 3 - Values of the basic characteristics for Table 7 - Values of the basic characteristics for
0 = 360” and B/D = 1 52 = 180°C and B/D q 1,5
E so E so
B B f 'Iti
Q’
74,208 0,2492 12,958 8,4489 0,039 4 66,6767 0,3781 8,571 8 4,5565 0,0385
02 02
62,5744 0,611 5,7868 4,2721 0,0785 54,2395 0,871 1 4,0972 2,4424 0,0628
0,4 Of4
50,4545 I,3182 3,2102 2,3761 0,1164 44,2171 I,7528 2,4496 1,6803 0,0755
08 016
0,1533
36,0278 3,5955 1,691 5 I,2766 32,582 4,3531 I,4182 I,1391 0,075
03 03
8,5203 I,0457 0,8537
26,3685 0,1708 24,256 9,6987 0,916 1 0,796 0,0675
Or9 03
23,0726 12,0342 0,8682 0,7275 0,1748 0,925 21,5177 13,4451
0,925 0,7846 0,6782 0,0632
19,799 0,659 9 0,5696
0,95 18,6392 0,1783 0,95 18,6557 20,5259 0,6423 0,5495 0,0589
12,9388 45,5721 0,4193 0,371 0,1808 0,975
0,975 12,6652 47,2761 0,4059 0,3701 0,050l
I
Table 4 - Values of the basic characteristics for Table 8 - Values of the basic characteristics for
D q 360” and B/D = 0,75 Q = 180” and B/D = I,25
E so E so
B f 'I* B f 'Iti
Q,’ Q’
0,1584 13,237;
75,022 20,390: 0,3255 67,7085 0,3106 10,415E 5,5146 0,0369
02 02
62,2584 0,3993 8,7606 6,183
0,065 55,2027 0,7326 4,8431 2,8666 0,061 5
014 0,4
49,355 4 0,9155 4,5167 3,3161 0,0972 44,3642
0,6 0,6 1,531 2 2,7744 1,893 1 0,0748
34,5144 2,7848 2,1067 I,5712 0,1292 32,449 1 3,981 9
03 03 I,5296 I,2248 0,0747
25,1887 7,1614 I,1979 0,9696 0,1447 24,0337 9,227 9
03 03 0,9643 0,822 0,0682
0,925 21,8823 10,461 1 0,9627 0,801 0,1483 0,925 21,247
12,8584 0,8106 0,7075 0,0642
0,95 17,739 3 17,7363 0,711 9 0,611 4 0,151 6 0,95 18,433 19,947 1 0,6549 0,0601
0,5589
0,975 12,4264 42,3829 0,4384 0,3869 0,153 0,975 12,3471 46,7535 0,4066 0,3706 0,0507

---------------------- Page: 6 ----------------------

SIST ISO 7902-2:2002
0 IS0
IS0 7902-2: 1998(E)
Table 13 - Values of the basic characteristics for
Table 9 - Values of the basic characteristics for
i2 = 180” and B/D = 1 Q = 150” and B/D = 1,5
E
Q; Q’
f ‘I@
61,7703
69,0182 0,2328 13,868 7,3068 ON0338 02 0,3058 10,574 4,7678 0,3288
02
3,6873 0,0575 47,9337 0,738 4,7933
56,4093 0,560-i 6,2861 0,4 2,489 0,0445
Of4
I,2448 3,3652 2,2797 0,0729 39,8508 I,5547 2,7181 1,659 9
44,589 05 0,0521
03
32,3681 3,4514 I,7312 1,379 9 0,0735 30,2152 4,061 6 I,4905 I,1082 0,0501
03
03
23,7701 8,4037 1,039 0,906 1 0,0679 23,4459 9,2073 0,961 8 0,771 2 0,0437
03
03
II,9405 0,8574 0,7446 0,064 0,925 20,432 13,0508 0,794 9 0,6551 0,0403
0,925 20,898 1
18,1351 18,5775 0,691 0,589 4 0,0601 0,95 17,262 20,569 9 0,6301 0,525 0,0365
0,95
0,975 11,901 7 45,771 0,4094 0,3754 0,051 3 0,975 12,396 46,5565 0,4083 0,35 0,0325
Values of the basic characteristics for Table 14 - Values of the basic characteristics for
Table 10 -
Q = 150” and BID = I,25
fl= 180” and B/D = 0,75
E SO
Q;
I I
70,5349 0,151 3 0,0289
02
0,0513
57,8558 0,381
084
0,066
45,0124 0,8883
05
2,6987 0,0698
32,3128
018
23,3367 7,1375 0,0649
03
0,925 20,4384 IO,4252 0,061 7
0,95 17,5793 16,7465 0,058 0,95 17,1592 19,8337 0,6474 0,5425 0,0375
0,975 II,2948 43,5128 0,051 3 0,975 12,2987 45,3826 0,4154 0,3705 0,0334
- Values of the basic characteristics for Table 15 - Values of the basic characteristics for
Table 11
0 = 150” and B/D = 1
s1= 180” and B/D = 0,5
E so
E
B 1 so 1 f'/ti 1 f/ll/ 1 Q; P f 'I$ fl*
Q’
I
72,293 9 0,0747 43,011 7 22,402E 0,021 3 64,1708 0,2022 15,945 s 7,1228
02 02 0,0268
58,1928 0,2002 17,289 7 9,961 0,0394 50,1904 0,509 9 6,8759 3,51 0,0434
0,4 014
45,697 1 0,49 8,2284 5,451 8 0,0522 41,1351 I,1434 3,631 8 2,1757 0,0526
08 Q6
31,5756 I,7222 3,2498 2,5502 0,0573 30,2445 3,2967 I,7897 I,3189 0,051 1
03 018
22,246 5,1676 I,5666 I,3352 0,0547 22,9634 8,0787 I,0677 0,8862 0,045
03 03
0,925 19,751 4 7,8436 I,2104 1,039 0,053 0,925 20,115 1 I,5986 0,871 9 0,7488 0,041 9
0,95 16,5935 13,852 0,862 0,741 9 0,0508 0,95 16,9465 18,7837 0,6741 0,5636 0,0383
0,975 10,769 1 38,055 0,4601 0,412 0,0451 0,975 12,1844 43,3026 0,4294 0,376 0,0339
Table 12 - Values of the basic characteristics for Table 16 - Values of the basic characteristics for
52 = 180” and B/D = 0,25 Q = 150” and B/D = 0,75
E so E so
f 'I$ fl* B
B f 'I* f/v I Q’
I I
I,
169,077 87,621 0,011 65,961 1 0,1367
73,936 4 0,019 02 23,553 10,449 c 0,0238
02
0,0537 64,0354 36,513 0,0214 51,9963 0,3561
59,6743 0,4 9,7827 4,9274 0,04
0,4
45,5631 0,1465 27,0145 16,989 0,0295 42,1174 0,8372 4,891 8 2,8877
0,6 0,05
05
0,6054 8,8522 6,0472 0,0339 30,6367 2,6068
30,5214 03 2,211 I,6154 0,0497
03
21,4482 2,172 5 3,4821 2,7036 0,0334 22,6695 6,9438 I,2114
03 I,0008 0,0443
02
19,5175 3,461 7 2,543 2,011 9 0,0332 0,925 19,8534 IO,1662 0,9704
0,925 0,8155 0,041 5
0,95 14,9385 7,3485 I,4916 I,2603 0,0321 0,95 16,681 2 16,940 9 0,7302 0,608
0,0382
0,975 9,461 7 23,4266 0,6837 0,5668 0,029 9 0,975 II,9044 40,5953 0,4488
0,3809 0,0337

---------------------- Page: 7 ----------------------

SIST ISO 7902-2:2002
ISO 7902-2: 1998(E)
@ IS0
Table 21 - Values of the basic characteristics for
Table I7 - Values of the basic characteristics for
Sz = 120” and B/D = 1
LI = 150” and B/D = 0,5
E fw
f 'I* Q,’
45,4882 20,028: 0,0184
67,982 1 0,0706
02
0,1899 18,2097 9,021 1 0,0323
0,4 54,2896
43,0078 0,4775 8,4291 4,9152 0,041 2
05
Of0431
30,3047 I,6927 3,2951 2,3785
03
22,1859 5,0335 I,6018 1,293 0,0402
03
1,022 0,0385
0,925 19,66 7,5834 1,246
0,8946 0,7383 0,0361 0,95 16,1452 18,0536 086894 0,541 8 0,0225
0,95 16,3781 13,2552
0,501 2 0,4245 0,031 7 0,975 12,4702 39,7924 0,4606 0,3896 0,0197
0,975 II,4673 34,9703
Table 22 - Values of the basic characteristics for
Table 18 - Values of the basic characteristics for
Q = 120” and BID = 0,75
52 = 150°C and B/D = 0,25
\
/
E E so
f 'I* Q
1 f'/+ 1 .fllc/ 1 Q’ 1
I I B I so
75,891 2 0,0099 61,3045 0,1102 29,1962 10,540: 0,0175
02
31,701 1 0,0185 45,8179 0,301 II,5302 4,8583 0,0277
0,4 0,4
15,6846 0,0248 37,1249 0,7471 5,4372 2,7565 0,0328
03 05
6,3433 0,0269 27,9978 2,4401 2,3336 I,5185 0,031 8
0,s W3
2,611 2 0,0259 0,9 21,1836 6,6561 I,2454 0,9561 0,0273
03
I,9114 0,0251 0,925
0,925 18,901 5 9,7602 0,9969 0,7665 0,0255
I,2701 0,0244 0,95 15,9688 16,4057
0,95 0,744 0,5905 0,0229
0,631 5 0,0221 0,975
0,975 12,3551 37,1528 0,4849 0,401 0,0202
Table 23
Table 19 - Values of the basic characteristics for - Values of the basic characteristics for
0 = 120” and B/D = 1,5 Q = 120” and B/D q 0,5
E E so
B B
Q’ 1 f'M 1 fl+ 1 Q'
14,682: 5,3943 0,0195 63,7072 0,061 1
56,6763 0,2196 02 52,602 18,817 3 0,0144
02
0,5536 6,3258 2,7433 0,0284 48,3597 0,171 3 20,155f
42,0362 Ot4 8,3305 0,0238
0,4
34,5662 I,2672 3,2692 I,7133 0,0335 39,0125 0,4446 9,021 4 0,0295
W3 08 4,4692
27,0973 3,6108 I,6323 I,0858 0,0308 27,961 I,6413 3,3776 2,1664 0,029 7
03 03
21,2301 8,7261 0,988 9 0,768 0,0254 20,901 3 4,956 1 I,6148 I,2272 0,0263
03 03
0,925 19,1732 12,2582 0,8264 0,6673 0,0235 0,925 18,9454 7,4106 I,2659 0,9624 0,025
0,95 16,2459 19,7605 0,642 0,5148 0,0209 0,95 15,6856 13,2503 0,8878 0,691 3 0,0227
0,975 12,5263 42,6121 0,4375 0,3537 0,0181 0,975 1 I,9048 31,9505 0,5481 0,4365 0,019 9
Table 20 - Values of the basic characteristics for Table 24 - Values of the basic characteristics for
fl= 120°C and B/D = I,25 J2 = 120” and B/D = 0,25
E so E so
f 'I* .fw Q 3’ B f 'M m
b I I Q’
58,2103 0,1848 17,438: 6,371 7 0,019 1 02 66,2399 0,0169 190,0235 67,3268 0,0082
02
42,953 0,4869 7,1767 3,091 1 0,0287 0,4 51,432 0,0507 67,7051 27,357 0,0148
Ot4
35,0689 I,1449 3,6023 I,8732 0,0338 06 41,1596 0,1387 28,511 7 13,7269 0,019
W3
27,2067 3,3665 I,7382 I,1514 0,031 3 W3 28,6466 0,5892 9,0777 5,6831 0,0199
03
21,2163 8,3078 I,0304 0,7984 0,0263 03 20,7885 2,1244 3,5523 2,5177 0,0185
019
0,925 19,068 1 II,7869 0,8526 0,691 1 0,0243 0,925 17,9741 3,5485 2,4728 I,8782 0,0176
0,95 I,,1962 19,0952 0,6594 0,5305
0,0223 0,95 14,8377 7,0378 1,551 2 I,1951 0,0165
0,975 12,497 1 41,1775 0,4488
0,3751 0,0189 0,975 II,0159 20,7702 0,7739 0,6091 0,0153

---------------------- Page: 8 ----------------------

SIST ISO 7902-2:2002
@ IS0
IS0 7902-2: 1998(E)
Table 25 Table 28 - Values of the basic characteristics for
- Values of the basic characteristics for
L! = 90” and B/D = 0,75
$2 = 90” and B/D = I,5
& so & so
B
B f ‘Iti .flll/ Q; f ‘Iti I ?r----T
I Q’
02 53,3402 0,1176 27,355 7,6276 0,011 4 56,944 4 0,0724 44,3583 12,206t 0,010 9
02
Of4 37,1665 0,3301 IO,5034 3,54 0,0159 40,2697 0,2094 16,4973 5,433 2 0,0163
Or4
I,9758 0,0174
016 28,9167 0,8642 4,6881 053 30,87 0,5746 6,9886 2,8638 0,0185
I,9746 I,1041 0,0151
03 23,2037 2,881 7 24,1523 2,0933 2,6649 I,4568 0,0171
03
0,0125
03 18,831 5 7,6366 1,089 0,7487 18,9534 6,0576 1,336 0,9064 0,0143
02
17,1845 II,0261 0,8865 0,6235 0,011 5 0,925
0,925 17,1651 9,0204 I,0531 0,7373 0,0132
0,95 14,8237
15,3757 0,7759 0,578 0,011 7
0,975 II,44 36,0784
0,488 0,3878 0,0103
- Values of the basic characteristics for Table 29
Table 26 - Values of the basic characteristics for
LZ = 90” and B/D = I,25 fl = 90” and B/D = 0,5
-
.
so &
&
B f '/I(/ fl$ B f 'Iti 1 f/$
Q,’ Q,’
30,061 7 8,3605
02 54,1165 0,1069 0,011 5 02 59,758 73,56 20,031 t 0,0096
37,6101 0,3074 11,266 3,786 0,0161 42,7063
0,4 26,0987 8,4393 0,015l
09
29,1984 0,8OC8 5,05 2,1145 0,0178 32,766 10,686 4,2761 0,0176
05 03
23,3782 2,719 2,0844 I,1605 0,0158 24,8677 3,7338 2,0008 0,0168
03 Or8
18,857 7,3176 I,1304 0,7752 0,013l 19,1302 I,7054 I,1418 0,0143
o,g 03
0,925 17,2396 IO,5982 0,9172 0,6451 0,0121 0,925 17,1373 I,2942 0,8704 0,0132
0,95 14,908 17,5885 0,6942 0,519 0,011 0,95 14,7154 0,9136 0,6752 0,011 8
,
0,975 11,511 7 39,9392 0,451 3 0,3601 0,009 9 0,975 11,271 1 0,5438 ~ I 0,4308 0,0103
Table 27 - Values of the basic characteristics for Table 30 - Values of the basic characteristics for
0 = 90” and B/D = 1 0 = 90” and B/D = 0,25
.
* I
E so
P .f Iti f/II/ Q,’
55,8145 0,089 3 35,979 9,9463 0,011 2 62,8374 0,0137 234,859 63,203 0,006l
02 02
38,6932 0,266 13,010 4,335 0,0163 46,171 9 0,0435 79,0197 24,894 0,0103
0,4 Of4
29,8006 0,7105 5,6762 2,3567 0,0183 35,8747 0,1276 30,9565 11,918 0,0129
03 05
25,6536 2,4774 2,274 I,2576 0,0165 26,2754 0,5626 9,484 4,901 4 0,013
0,8 03
19,043 6,803 I,2062 0,8233 0,0138 19,4224 2,0827 3,6103 2,286 0,011 4
03 03
0,6735 0,925
0,925 17,2021 10,011 5 0,9626 0,0126 17,2907 3,434 2,545l I,6958 0,0108
0,5377 14,5522
0,95 14,9196 16,8158 0,7206 0,011 5 0,95 6,8003 I,5989 I,1093 0,009 9
II,4801 38,4785 0,4645 0,369 9 0,0103 0,975 10,663 20,2802 0,7873 0,5875 0,0087
0,975
5

---------------------- Page: 9 ----------------------

SIST ISO 7902-2:2002
IS0 7902-2: 1998(E) @ IS0
4 Graphs of basic bearing characteristics
Figures 1 to 50 graphically represent the functions p, So, f’ly, f@and Qi.
I I, I I I I
’ ’ I I 1 1 1
I- I I 1 I I
1 L 11
a
...