ISO/TS 31657-2:2020

TECHNICAL ISO/TS
SPECIFICATION 31657-2
First edition
2020-06
Plain bearings — Hydrodynamic plain
journal bearings under steady-state
conditions —
Part 2:
Functions for calculation of multi-
lobed journal bearings
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Functions for calculation of multi-lobed journal bearings . 1
4.1 General . 1
4.2 Two-lobe bearings . 4
4.3 Three-lobe bearings .20
4.4 Four-lobe bearings.32
Annex A (informative) Characteristic curves for four-lobe bearings .50
Bibliography .67
Foreword
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This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 8,
Calculation methods for plain bearings and their applications.
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iv © ISO 2020 – All rights reserved

TECHNICAL SPECIFICATION ISO/TS 31657-2:2020(E)
Plain bearings — Hydrodynamic plain journal bearings
under steady-state conditions —
Part 2:
Functions for calculation of multi-lobed journal bearings
1 Scope
This document specifies the characteristic values for selected two-, three- and four-lobe bearings.
The functions plotted and listed in table form below are required for the operationally safe design
of hydrodynamic multi-lobed journal bearings according to ISO/TS 31657-1. They are based on the
presumptions and boundary conditions indicated there and only apply to stationary operating states.
The symbols used are explained in ISO/TS 31657-1; calculation examples are also included there.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Functions for calculation of multi-lobed journal bearings
4.1 General
The characteristic values for two-, three- and four-lobe bearings with relative lubrication pocket widths
*
of b = 0,8 are shown in table form below. The characteristic values were calculated for the geometrical
P
parameters summarised in Figure 1 (angular spans of segment sliding surface, Ω, angular coordinates
* *
of lubricant pocket centrelines, ϕ , gap ratios, h , bearing width ratios B ) in the operating range
P,1 0,max
* *
0,02 ≤ h ≤ 1. The profile factors,K , associated with the indicated gap ratios, h , can be
min P 0,max
calculated for these bearing types as follows:
*
Kh=        for Z = 2
P 0,max
*
Kh=⋅21−    for Z = 3
P 0,max
*
h −
0,max
K =   for Z = 4
P
1−
The following (dimensionless) characteristic values are indicated in Tables 1 to 43:
a) Static characteristic values
Sommerfeld number:
F⋅ψ
eff
So=
BD⋅⋅ηω⋅
eff
Relative eccentricity:
e
ε =
C
R,eff
Attitude angle, β, in °.
Product of maximum lubricant film pressure parameter and Sommerfeld number:
p ⋅ψ
max eff
*
pS⋅=o
max
ηω⋅
eff
Minimum relative lubricant film thickness:
h
min
*
h =
min
C
R,eff
Friction force parameter:
f
*
F =⋅So
f
ψ
eff
Lubricant flow rate parameter due to hydrodynamic pressure build-up:
Q
*
Q =
Q
Lubricant flow rate parameter due to supply pressure:
Q
p
*
Q =
p
*
PQ⋅
en 0
Lubricant flow rate parameter at the exit of the lubrication gap:
Q
*
Q =
Q
Non-dimensional difference between maximum lubricant temperature and lubricant temperature
in the lubricant pockets:
ρψ⋅⋅c
p eff
*
ΔΔT = ⋅ T
max max
pf⋅
2 © ISO 2020 – All rights reserved

b) Dynamic characteristic values
Non-dimensional lubricant film stiffness coefficients:
ψ
eff
*
c = ⋅c     (i, k = 1, 2)
ik, ik,
2⋅⋅Bηω⋅
eff
Non-dimensional lubricant film damping coefficients:
ψ
eff
*
d = ⋅⋅ω d   (i, k = 1, 2)
ik, ik,
2⋅⋅Bηω⋅
eff
For some selected four-lobe bearings (Ω = 70°, ϕ = 315°), these characteristic values are shown
P,1
*
graphically as a function of the Sommerfeld number So, the gap ratio h and the bearing width ratio
0,max
*
B in Annex A, Figures A.1 to A.16.
Figure 1 — Geometrical parameters of selected multi-lobed journal bearings
4.2 Two-lobe bearings
Characteristic values for two-lobe bearings are listed in Tables 1 to 15.
4 © ISO 2020 – All rights reserved

*
Table 1 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 180°, h = 3, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,327 1,000 1,780 0,959 36,868 1,619 1,25 0,364 –0,107 0,174 0,019 0,541 0,168 0,168 0,093
0,014 0,203 15,82 0,364 0,935 1,790 0,971 37,474 1,604 1,35 0,373 –0,106 0,181 0,023 0,548 0,171 0,171 0,099
0,029 0,406 15,38 0,422 0,856 1,822 1,007 39,301 1,560 1,50 0,401 –0,105 0,201 0,035 0,576 0,182 0,182 0,116
0,048 0,607 14,65 0,510 0,768 1,878 1,065 42,339 1,488 1,71 0,455 –0,100 0,241 0,058 0,623 0,202 0,202 0,150
0,073 0,805 13,63 0,639 0,675 1,962 1,145 46,566 1,388 1,99 0,542 –0,089 0,306 0,099 0,699 0,235 0,235 0,206
0,108 1,001 12,36 0,834 0,579 2,083 1,243 52,000 1,265 2,35 0,684 –0,067 0,415 0,174 0,815 0,289 0,289 0,297
0,159 1,195 10,84 1,139 0,485 2,255 1,357 58,643 1,118 2,88 0,916 –0,020 0,599 0,314 0,994 0,376 0,377 0,450
0,241 1,387 9,11 1,645 0,392 2,504 1,482 66,479 0,953 3,64 1,323 0,084 0,932 0,597 1,285 0,525 0,525 0,721
0,384 1,577 7,17 2,569 0,303 2,884 1,616 75,476 0,769 4,80 2,120 0,326 1,599 1,240 1,810 0,801 0,801 1,249
0,677 1,768 5,05 4,546 0,217 3,522 1,755 85,736 0,567 6,73 4,010 1,012 3,194 3,029 2,907 1,371 1,371 2,459
1,478 1,959 2,79 10,341 0,133 4,839 1,898 97,153 0,350 10,97 10,662 3,665 8,585 10,316 6,159 2,978 2,978 6,332
3,840 2,100 1,14 29,250 0,071 7,487 2,003 106,265 0,177 20,77 40,455 15,265 29,531 46,571 17,323 7,373 7,374 20,278
18,558 2,200 0,18 183,912 0,022 16,491 2,079 113,058 0,049 65,04 514,115 142,002 242,523 642,042 124,068 32,520 32,518 154,507
45,130 2,220 0,06 569,417 0,010 26,225 2,095 114,450 0,023 142,08 2 504,109 425,818 779,476 3 114,672 443,694 115,503 115,503 554,368

6 © ISO 2020 – All rights reserved
*
Table 2 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 180°, h = 5, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,342 1,000 1,507 1,787 152,625 1,670 1,25 0,284 –0,038 0,110 0,022 0,315 0,081 0,081 0,039
0,011 0,301 7,29 0,370 0,951 1,518 1,801 154,870 1,650 1,33 0,292 –0,038 0,114 0,024 0,321 0,083 0,083 0,041
0,023 0,602 7,02 0,418 0,883 1,551 1,841 161,614 1,598 1,46 0,315 –0,036 0,125 0,031 0,339 0,089 0,089 0,048
0,038 0,902 6,57 0,493 0,800 1,610 1,905 172,838 1,510 1,64 0,359 –0,033 0,147 0,044 0,373 0,099 0,099 0,062
0,058 1,202 5,93 0,609 0,706 1,703 1,994 188,597 1,388 1,88 0,434 –0,026 0,185 0,069 0,427 0,116 0,116 0,085
0,088 1,500 5,14 0,793 0,604 1,841 2,104 208,778 1,235 2,25 0,564 –0,012 0,252 0,116 0,519 0,145 0,145 0,125
0,134 1,798 4,21 1,106 0,496 2,051 2,234 233,495 1,050 2,78 0,805 0,021 0,373 0,212 0,674 0,194 0,194 0,199
0,218 2,095 3,15 1,701 0,384 2,386 2,380 262,650 0,836 3,69 1,311 0,097 0,623 0,435 0,977 0,287 0,287 0,350
0,321 2,293 2,40 2,463 0,307 2,742 2,486 284,578 0,676 4,64 2,042 0,218 0,968 0,784 1,367 0,401 0,402 0,554
0,517 2,491 1,62 3,996 0,228 3,319 2,597 308,482 0,504 6,29 3,737 0,505 1,725 1,650 2,183 0,611 0,611 0,992
1,004 2,690 0,86 8,151 0,146 4,446 2,713 334,471 0,319 9,97 9,508 1,410 3,958 4,721 4,513 1,177 1,177 2,276
3,915 2,900 0,18 40,203 0,052 8,632 2,842 364,011 0,109 28,23 85,684 10,417 24,374 47,054 24,886 4,356 4,355 13,687
8,457 2,950 0,07 107,659 0,027 12,809 2,873 371,364 0,056 54,49 334,928 30,443 71,696 186,580 74,182 9,627 9,627 41,342
14,689 2,970 0,03 224,879 0,017 17,027 2,886 374,341 0,035 89,35 926,933 61,807 152,876 517,668 164,982 19,973 19,972 92,317

*
Table 3 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 240°, h = 3, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,327 1,000 1,780 0,959 36,868 1,619 1,25 0,135 –0,307 –0,025 0,249 0,351 –0,278 –0,278 0,283
0,024 0,300 65,76 0,343 0,948 1,800 0,986 38,272 1,585 1,30 0,144 –0,316 –0,024 0,259 0,360 –0,279 –0,279 0,296
0,053 0,600 64,93 0,388 0,863 1,862 1,065 42,498 1,483 1,39 0,176 –0,345 –0,021 0,296 0,394 –0,286 –0,285 0,339
0,096 0,900 63,58 0,501 0,756 1,983 1,191 49,575 1,320 1,55 0,239 –0,401 –0,010 0,380 0,458 –0,297 –0,297 0,435
0,195 1,255 61,44 0,833 0,612 2,255 1,387 61,648 1,055 2,00 0,395 –0,528 0,031 0,646 0,603 –0,316 –0,316 0,697
0,337 1,488 59,74 1,406 0,502 2,590 1,535 71,722 0,844 2,77 0,602 –0,683 0,128 1,168 0,780 –0,327 –0,326 1,148
0,647 1,698 58,00 2,889 0,331 3,159 1,675 82,206 0,632 4,44 0,968 –0,912 0,463 2,796 1,054 –0,296 –0,296 2,322
1,449 1,860 56,29 7,683 0,182 4,165 1,784 91,126 0,455 9,19 1,578 –1,003 1,986 9,830 1,400 0,010 0,010 6,279
4,655 1,931 53,56 34,941 0,068 6,408 1,816 94,911 0,372 29,85 3,188 2,998 14,895 75,236 1,592 2,566 2,567 30,672
11,520 1,879 50,12 119,413 0,030 9,298 1,747 90,997 0,431 76,95 7,878 21,587 63,226 403,924 1,955 9,260 9,259 113,638
26,368 1,811 46,94 379,970 0,014 13,580 1,670 86,161 0,509 179,60 19,622 83,789 224,646 1 939,293 3,095 25,234 25,233 393,073

8 © ISO 2020 – All rights reserved
*
Table 4 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 240°, h = 5, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,342 1,000 1,507 1,787 152,625 1,669 1,25 0,119 –0,206 –0,057 0,188 0,178 –0,160 –0,160 0,175
0,013 0,300 59,79 0,356 0,988 1,517 1,801 154,887 1,650 1,27 0,121 –0,209 –0,058 0,193 0,181 –0,162 –0,162 0,180
0,028 0,600 59,61 0,387 0,951 1,548 1,839 161,674 1,597 1,34 0,130 –0,220 –0,060 0,209 0,189 –0,167 –0,167 0,193
0,046 0,900 59,33 0,442 0,890 1,604 1,902 172,982 1,508 1,44 0,148 –0,240 –0,065 0,240 0,203 –0,176 –0,176 0,218
0,074 1,231 58,89 0,549 0,792 1,703 1,998 190,702 1,371 1,64 0,179 –0,279 –0,073 0,305 0,230 –0,194 –0,194 0,269
0,111 1,518 58,43 0,717 0,683 1,837 2,102 210,507 1,220 1,95 0,225 –0,335 –0,083 0,413 0,268 –0,218 –0,218 0,350
0,171 1,797 57,95 1,021 0,556 2,037 2,219 233,701 1,046 2,47 0,300 –0,428 –0,097 0,630 0,324 –0,255 –0,255 0,499
0,281 2,070 57,47 1,659 0,416 2,354 2,348 260,142 0,851 3,45 0,433 –0,601 –0,115 1,150 0,415 –0,318 –0,318 0,815
0,546 2,341 57,09 3,440 0,264 2,940 2,489 290,060 0,633 5,87 0,710 –1,003 –0,110 2,946 0,588 –0,441 –0,441 1,731
1,816 2,625 56,97 15,037 0,101 4,646 2,652 325,394 0,380 17,84 1,631 –2,658 0,683 21,407 1,044 –0,742 –0,742 8,014
3,419 2,702 57,02 34,428 0,058 6,004 2,699 335,693 0,306 34,13 2,381 –4,050 3,505 65,596 1,325 –0,735 –0,735 19,502
13,503 2,757 56,80 224,496 0,017 10,618 2,731 343,151 0,252 136,17 5,394 6,815 53,808 863,057 1,707 2,358 2,358 132,080

*
Table 5 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 1, B* = 0,5
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,000 1,000 2,614 0,000 3,008 1,000 2,00 0,000 –0,262 0,671 0,000 0,523 0,000 0,000 1,342
0,090 0,236 64,91 0,192 0,764 2,430 0,175 3,394 0,796 2,71 0,160 –0,171 0,469 0,163 0,372 0,174 0,174 0,923
0,163 0,361 56,42 0,373 0,639 2,471 0,245 3,784 0,706 3,34 0,292 –0,210 0,674 0,345 0,510 0,339 0,338 1,309
0,260 0,467 50,13 0,643 0,533 2,607 0,291 4,131 0,639 3,93 0,438 –0,204 0,976 0,690 0,599 0,501 0,501 1,868
0,401 0,562 44,64 1,081 0,438 2,833 0,323 4,403 0,588 4,66 0,650 –0,180 1,473 1,332 0,730 0,740 0,740 2,783
0,626 0,649 39,58 1,849 0,351 3,168 0,342 4,584 0,548 5,68 0,983 –0,107 2,338 2,622 0,926 1,120 1,120 4,383
1,011 0,729 34,71 3,317 0,271 3,649 0,351 4,663 0,520 7,20 1,570 0,093 4,007 5,477 1,241 1,791 1,793 7,460
1,783 0,805 29,68 6,656 0,195 4,392 0,350 4,633 0,502 9,89 2,748 0,706 7,804 13,213 1,799 3,154 3,155 14,473
3,709 0,877 24,15 16,512 0,123 5,714 0,335 4,477 0,497 15,89 5,805 3,052 19,273 41,921 3,039 6,768 6,767 35,742
11,175 0,943 17,40 66,166 0,057 8,914 0,303 4,174 0,511 36,26 18,352 19,280 80,457 252,403 6,810 21,690 21,697 148,293
30,369 0,974 12,58 238,937 0,026 13,981 0,273 3,946 0,534 85,56 53,612 93,221 315,937 1 384,251 14,455 64,581 64,585 574,742
59,033 0,985 9,96 568,507 0,015 19,196 0,255 3,837 0,550 155,16 109,469 267,165 805,560 4 501,754 23,051 130,675 130,663 1 433,334

10 © ISO 2020 – All rights reserved
*
Table 6 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 3, B* = 0,5
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,219 1,000 1,737 0,864 50,725 1,052 1,16 0,017 –0,121 0,059 0,244 0,062 –0,107 –0,107 0,330
0,029 0,300 81,39 0,264 0,934 1,758 0,884 52,595 1,030 1,30 0,020 –0,121 0,067 0,259 0,066 –0,102 –0,102 0,346
0,065 0,574 79,98 0,352 0,825 1,819 0,935 57,521 0,972 1,54 0,031 –0,121 0,093 0,310 0,075 –0,088 –0,087 0,394
0,138 0,861 76,57 0,600 0,646 1,967 1,014 65,671 0,879 2,09 0,059 –0,105 0,182 0,481 0,095 –0,040 –0,040 0,549
0,228 1,001 72,54 0,976 0,510 2,132 1,054 70,214 0,825 2,83 0,101 –0,068 0,328 0,784 0,113 0,030 0,030 0,797
0,343 1,066 67,95 1,538 0,404 2,320 1,064 71,688 0,804 3,75 0,160 –0,010 0,551 1,309 0,133 0,121 0,121 1,184
0,505 1,092 62,75 2,424 0,318 2,554 1,052 71,111 0,804 5,03 0,246 0,084 0,904 2,271 0,159 0,240 0,241 1,814
0,756 1,097 56,85 3,974 0,243 2,874 1,026 69,181 0,819 6,99 0,385 0,250 1,532 4,237 0,198 0,418 0,418 2,959
1,208 1,090 50,03 7,147 0,174 3,365 0,989 66,289 0,845 10,42 0,642 0,617 2,852 9,028 0,266 0,735 0,736 5,382
2,202 1,074 41,86 15,349 0,110 4,232 0,940 62,611 0,882 17,84 1,239 1,686 6,465 24,638 0,409 1,478 1,479 12,023
5,666 1,047 30,73 52,233 0,051 6,345 0,876 58,047 0,935 42,44 3,428 7,798 24,121 128,756 0,772 4,047 4,046 43,158
13,560 1,028 22,43 166,704 0,024 9,519 0,837 55,380 0,971 98,25 8,914 30,395 85,418 623,960 1,465 10,802 10,799 150,032
24,443 1,019 17,86 371,567 0,014 12,657 0,819 54,246 0,987 175,92 17,061 74,399 204,567 1 848,538 2,327 21,727 21,726 361,019

*
Table 7 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 5, B* = 0,5
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,247 1,000 1,450 1,650 213,796 1,082 1,13 0,017 –0,082 0,023 0,209 0,027 –0,055 –0,055 0,212
0,016 0,250 77,97 0,282 0,941 1,459 1,658 215,843 1,072 1,25 0,018 –0,082 0,025 0,215 0,027 –0,055 –0,055 0,217
0,033 0,470 77,67 0,329 0,874 1,481 1,675 221,018 1,052 1,39 0,019 –0,082 0,031 0,233 0,028 –0,053 –0,053 0,230
0,075 0,854 76,43 0,487 0,718 1,569 1,726 237,424 0,990 1,79 0,026 –0,081 0,057 0,315 0,032 –0,044 –0,044 0,289
0,133 1,118 74,44 0,768 0,567 1,701 1,775 253,621 0,928 2,43 0,039 –0,071 0,115 0,489 0,037 –0,024 –0,024 0,405
0,217 1,270 71,65 1,238 0,438 1,871 1,803 263,800 0,887 3,41 0,060 –0,047 0,222 0,826 0,045 0,011 0,011 0,609
0,338 1,335 68,02 2,019 0,333 2,085 1,806 266,737 0,873 4,79 0,096 0,005 0,409 1,485 0,054 0,063 0,064 0,953
0,524 1,341 63,43 3,385 0,246 2,370 1,790 263,798 0,879 7,04 0,157 0,102 0,755 2,844 0,069 0,147 0,148 1,591
0,846 1,306 57,59 6,119 0,172 2,790 1,758 256,513 0,901 10,80 0,270 0,320 1,476 6,156 0,094 0,293 0,293 2,916
1,534 1,240 49,80 13,089 0,107 3,517 1,714 246,007 0,936 18,85 0,524 0,962 3,420 17,016 0,139 0,603 0,603 6,416
3,824 1,144 38,09 43,390 0,049 5,237 1,659 232,808 0,981 46,29 1,454 4,265 12,856 86,361 0,272 1,777 1,777 23,268
8,906 1,081 28,45 136,265 0,023 7,783 1,627 225,087 1,009 105,72 3,721 15,807 45,042 407,129 0,523 4,864 4,863 81,056
16,009 1,051 22,64 305,473 0,014 10,294 1,613 221,714 1,022 184,85 6,936 40,897 106,192 1 241,172 0,729 8,678 8,678 184,187

12 © ISO 2020 – All rights reserved
*
Table 8 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 1, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,000 1,000 2,614 0,000 2,419 1,500 2,00 0,000 –0,397 1,303 0,000 0,793 0,000 0,000 2,604
0,067 0,100 76,62 0,136 0,900 2,503 0,106 2,480 1,370 2,20 0,100 –0,209 0,696 0,112 0,427 0,101 0,101 1,392
0,162 0,225 63,62 0,343 0,775 2,442 0,217 2,685 1,219 2,70 0,252 –0,253 0,871 0,293 0,551 0,273 0,273 1,744
0,290 0,348 54,89 0,648 0,652 2,488 0,299 2,963 1,088 3,38 0,472 –0,332 1,207 0,579 0,794 0,558 0,557 2,425
0,457 0,457 48,98 1,091 0,543 2,635 0,355 3,240 0,985 4,09 0,721 –0,361 1,696 1,103 0,999 0,870 0,871 3,406
0,692 0,555 43,88 1,780 0,445 2,882 0,390 3,475 0,903 4,90 1,042 –0,331 2,442 2,074 1,199 1,247 1,248 4,895
1,051 0,645 39,18 2,936 0,355 3,251 0,410 3,655 0,838 6,02 1,540 –0,234 3,707 3,955 1,496 1,835 1,835 7,407
1,653 0,729 34,54 5,096 0,271 3,797 0,415 3,765 0,788 7,80 2,399 0,043 6,097 8,041 1,966 2,855 2,854 12,140
2,787 0,807 29,76 9,707 0,193 4,637 0,406 3,793 0,755 10,96 4,080 0,888 11,320 18,552 2,781 4,861 4,862 22,404
5,384 0,879 24,49 22,147 0,121 6,098 0,382 3,723 0,742 18,01 8,162 4,039 26,083 54,894 4,462 9,790 9,792 51,020
14,772 0,945 17,77 80,430 0,055 9,630 0,335 3,530 0,761 42,36 24,424 25,423 102,609 311,066 9,486 29,552 29,548 194,465
37,137 0,975 12,88 268,936 0,025 15,046 0,295 3,368 0,797 98,40 67,256 120,183 382,518 1 634,706 18,574 81,019 81,010 695,146
70,430 0,986 10,12 636,223 0,014 20,696 0,272 3,286 0,823 176,24 135,182 347,197 971,881 5 376,094 28,396 158,436 158,420 1 696,999

*
Table 9 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 3, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,327 1,000 1,780 0,959 36,868 1,619 1,25 0,019 –0,174 0,107 0,364 0,093 –0,168 –0,168 0,541
0,045 0,300 83,10 0,392 0,942 1,802 0,984 38,266 1,584 1,40 0,025 –0,175 0,117 0,382 0,099 –0,161 –0,160 0,560
0,117 0,638 80,98 0,557 0,808 1,892 1,067 43,136 1,466 1,73 0,046 –0,171 0,165 0,470 0,118 –0,127 –0,126 0,650
0,227 0,900 77,18 0,909 0,632 2,059 1,158 49,062 1,323 2,37 0,091 –0,143 0,291 0,703 0,146 –0,047 –0,046 0,872
0,353 1,026 73,00 1,404 0,499 2,241 1,197 52,183 1,245 3,20 0,148 –0,089 0,483 1,096 0,170 0,055 0,055 1,206
0,510 1,086 68,38 2,114 0,396 2,450 1,198 53,198 1,212 4,30 0,228 –0,007 0,769 1,762 0,195 0,181 0,181 1,718
0,721 1,110 63,23 3,198 0,311 2,709 1,176 52,773 1,210 5,78 0,341 0,119 1,214 2,965 0,228 0,338 0,338 2,533
1,042 1,114 57,40 5,043 0,236 3,065 1,137 51,373 1,230 8,14 0,522 0,341 2,001 5,377 0,280 0,576 0,576 4,004
1,594 1,105 50,69 8,665 0,168 3,600 1,084 49,245 1,268 12,06 0,845 0,828 3,608 11,141 0,363 0,969 0,968 6,955
2,789 1,085 42,46 17,882 0,106 4,546 1,018 46,449 1,326 20,82 1,590 2,224 8,015 29,830 0,542 1,900 1,900 15,036
6,710 1,053 31,31 57,534 0,049 6,779 0,936 43,014 1,409 48,78 4,258 9,513 28,983 147,989 1,032 5,266 5,266 52,508
15,486 1,030 22,73 180,447 0,023 10,111 0,887 40,957 1,467 108,79 10,525 37,762 98,999 719,051 1,718 12,433 12,433 169,558
27,571 1,020 18,00 406,280 0,013 13,447 0,867 40,095 1,493 194,71 20,214 89,574 239,540 2 124,936 2,831 26,132 26,132 419,399

14 © ISO 2020 – All rights reserved
*
Table 10 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 5, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,342 1,000 1,507 1,787 152,625 1,669 1,25 0,022 –0,110 0,038 0,284 0,039 –0,081 –0,081 0,315
0,029 0,300 78,47 0,399 0,929 1,520 1,799 154,807 1,651 1,40 0,023 –0,110 0,043 0,295 0,039 –0,080 –0,080 0,325
0,049 0,488 78,16 0,453 0,872 1,543 1,817 158,387 1,622 1,54 0,025 –0,110 0,049 0,315 0,041 –0,077 –0,077 0,341
0,108 0,877 76,80 0,656 0,714 1,642 1,879 171,063 1,520 2,02 0,035 –0,107 0,084 0,419 0,046 –0,063 –0,063 0,419
0,187 1,139 74,73 0,998 0,562 1,788 1,934 183,227 1,421 2,79 0,052 –0,094 0,157 0,629 0,054 –0,035 –0,035 0,569
0,294 1,289 71,93 1,548 0,433 1,974 1,962 190,823 1,356 3,86 0,079 –0,061 0,286 1,033 0,063 0,009 0,009 0,815
0,444 1,355 68,35 2,439 0,327 2,209 1,961 193,200 1,330 5,54 0,124 0,003 0,513 1,803 0,076 0,079 0,079 1,245
0,667 1,361 63,83 3,967 0,241 2,519 1,935 191,147 1,338 8,08 0,198 0,129 0,922 3,404 0,093 0,182 0,181 2,001
1,044 1,324 58,10 6,949 0,168 2,971 1,891 185,766 1,371 12,44 0,335 0,400 1,772 7,225 0,123 0,361 0,361 3,568
1,825 1,254 50,39 14,389 0,104 3,743 1,834 177,889 1,425 21,58 0,641 1,169 4,049 19,502 0,180 0,749 0,749 7,686
4,371 1,151 38,56 46,618 0,047 5,555 1,766 167,848 1,499 51,14 1,733 5,058 14,976 97,311 0,343 2,180 2,180 27,196
9,686 1,085 28,94 141,384 0,023 8,110 1,730 162,095 1,544 112,02 4,175 18,270 49,367 439,551 0,591 5,339 5,339 86,992
17,351 1,053 22,89 321,176 0,013 10,739 1,715 159,494 1,565 196,95 7,771 47,131 117,285 1 358,273 0,819 9,579 9,579 199,359

*
Table 11 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 1, B* = 1
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,000 1,000 2,614 0,000 2,108 2,000 2,00 0,000 –0,489 1,949 0,000 0,978 0,000 0,000 3,900
0,099 0,100 75,43 0,202 0,900 2,504 0,122 2,158 1,834 2,21 0,135 –0,259 1,039 0,163 0,528 0,138 0,138 2,084
0,229 0,217 62,56 0,479 0,783 2,451 0,237 2,311 1,651 2,70 0,323 –0,309 1,262 0,399 0,671 0,349 0,348 2,558
0,402 0,338 53,64 0,882 0,662 2,502 0,324 2,531 1,483 3,38 0,597 –0,405 1,685 0,766 0,957 0,704 0,704 3,465
0,624 0,448 47,91 1,451 0,552 2,656 0,382 2,764 1,344 4,23 0,941 –0,501 2,314 1,367 1,318 1,190 1,191 4,826
0,933 0,549 43,19 2,317 0,451 2,919 0,419 2,983 1,228 5,11 1,335 –0,472 3,215 2,548 1,563 1,664 1,665 6,733
1,391 0,642 38,78 3,732 0,358 3,315 0,438 3,166 1,134 6,40 1,936 –0,360 4,718 4,788 1,913 2,386 2,385 9,890
2,118 0,727 34,46 6,227 0,273 3,890 0,440 3,295 1,061 8,35 2,935 –0,048 7,439 9,440 2,463 3,590 3,592 15,533
3,466 0,807 29,85 11,452 0,193 4,788 0,427 3,361 1,010 11,89 4,896 0,934 13,394 21,341 3,419 5,955 5,959 27,630
6,450 0,880 24,68 25,040 0,120 6,339 0,397 3,345 0,988 19,73 9,558 4,626 29,934 61,882 5,316 11,559 11,552 60,213
16,854 0,946 17,96 86,518 0,054 10,043 0,343 3,220 1,011 46,31 27,847 29,359 114,765 343,527 10,933 33,673 33,682 219,295
40,350 0,975 13,08 277,380 0,025 15,534 0,300 3,102 1,058 104,69 74,270 131,880 413,357 1 726,357 21,118 90,642 90,640 754,679

16 © ISO 2020 – All rights reserved
*
Table 12 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 3, B* = 1
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,393 1,000 1,808 0,986 29,398 2,196 1,31 0,019 –0,207 0,147 0,440 0,114 –0,211 –0,211 0,698
0,079 0,400 83,67 0,512 0,918 1,850 1,035 31,411 2,112 1,55 0,031 –0,207 0,166 0,476 0,126 –0,193 –0,193 0,735
0,159 0,675 81,48 0,697 0,796 1,942 1,118 35,083 1,961 1,90 0,057 –0,201 0,221 0,572 0,149 –0,148 –0,148 0,839
0,292 0,921 77,45 1,104 0,623 2,120 1,209 39,751 1,771 2,63 0,112 –0,165 0,367 0,837 0,181 –0,048 –0,048 1,097
0,439 1,039 73,23 1,651 0,494 2,311 1,243 42,157 1,667 3,55 0,180 –0,101 0,584 1,272 0,208 0,075 0,075 1,483
0,618 1,096 68,61 2,420 0,392 2,531 1,240 42,954 1,621 4,75 0,270 –0,006 0,900 2,010 0,235 0,220 0,220 2,057
0,857 1,120 63,47 3,584 0,307 2,806 1,212 42,658 1,617 6,43 0,399 0,140 1,399 3,339 0,273 0,404 0,404 2,985
1,214 1,123 57,68 5,540 0,232 3,179 1,166 41,559 1,642 9,06 0,602 0,398 2,268 6,003 0,329 0,667 0,667 4,610
1,821 1,112 51,00 9,343 0,165 3,739 1,108 39,856 1,692 13,43 0,970 0,942 4,065 12,275 0,430 1,134 1,135 7,956
3,101 1,090 42,82 18,828 0,104 4,711 1,035 37,631 1,770 22,61 1,784 2,518 8,837 32,377 0,619 2,137 2,137 16,629
7,286 1,056 31,54 59,890 0,048 7,014 0,947 34,862 1,885 52,36 4,684 10,704 31,510 159,850 1,140 5,743 5,743 56,670
16,347 1,032 22,96 184,394 0,023 10,374 0,896 33,221 1,965 114,02 11,300 41,323 105,004 757,441 1,843 13,157 13,156 177,370
29,280 1,020 18,04 424,328 0,013 13,865 0,875 32,501 2,003 206,19 21,870 98,747 258,299 2 287,242 3,066 28,191 28,188 448,341

*
Table 13 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 270°, h = 5, B* = 1
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,393 1,000 1,542 1,820 119,959 2,263 1,32 0,024 –0,126 0,050 0,327 0,046 –0,098 –0,098 0,383
0,028 0,250 78,87 0,443 0,944 1,551 1,826 121,181 2,248 1,47 0,025 –0,126 0,053 0,335 0,047 –0,097 –0,097 0,390
0,060 0,500 78,46 0,519 0,871 1,581 1,851 124,833 2,198 1,67 0,028 –0,126 0,063 0,362 0,049 –0,093 –0,093 0,413
0,130 0,891 77,02 0,744 0,711 1,687 1,917 135,296 2,053 2,22 0,040 –0,122 0,102 0,476 0,055 –0,075 –0,075 0,503
0,220 1,151 74,89 1,110 0,559 1,841 1,972 145,155 1,916 3,06 0,059 –0,106 0,182 0,705 0,064 –0,042 –0,042 0,668
0,339 1,300 72,08 1,689 0,430 2,036 1,999 151,327 1,826 4,26 0,090 –0,069 0,323 1,142 0,074 0,009 0,009 0,942
0,504 1,365 68,51 2,615 0,324 2,280 1,995 153,279 1,790 6,05 0,139 0,004 0,569 1,976 0,088 0,085 0,085 1,403
0,746 1,370 64,05 4,187 0,238 2,602 1,965 151,680 1,800 8,79 0,220 0,142 1,012 3,680 0,108 0,200 0,200 2,229
1,153 1,333 58,31 7,273 0,165 3,072 1,917 147,414 1,845 13,48 0,371 0,444 1,939 7,793 0,141 0,400 0,400 3,935
1,985 1,261 50,62 14,933 0,102 3,867 1,856 141,074 1,920 23,18 0,704 1,291 4,395 20,907 0,203 0,826 0,826 8,372
4,632 1,155 38,81 47,788 0,047 5,703 1,785 132,986 2,023 53,77 1,855 5,535 15,862 102,663 0,368 2,295 2,295 28,511
10,243 1,086 29,00 146,773 0,022 8,344 1,748 128,281 2,086 118,11 4,483 19,982 52,802 469,566 0,635 5,700 5,699 92,269
18,128 1,054 22,97 331,415 0,013 11,001 1,735 126,220 2,115 205,49 8,279 50,526 124,315 1 429,759 0,882 10,240 10,240 210,308

18 © ISO 2020 – All rights reserved
*
Table 14 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 300°, h = 3, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,327 1,000 1,780 0,959 36,868 1,619 1,25 0,077 –0,008 0,274 0,307 0,060 0,110 0,110 0,574
0,034 0,100 5,49 0,402 0,909 1,789 0,959 36,910 1,618 1,44 0,078 –0,008 0,280 0,320 0,060 0,111 0,111 0,587
0,070 0,200 4,88 0,502 0,817 1,814 0,959 37,039 1,614 1,70 0,084 –0,006 0,300 0,362 0,063 0,119 0,119 0,629
0,111 0,300 3,87 0,637 0,727 1,859 0,959 37,271 1,608 2,00 0,094 –0,002 0,337 0,441 0,069 0,133 0,133 0,706
0,160 0,400 2,54 0,824 0,638 1,926 0,961 37,627 1,598 2,42 0,110 0,005 0,395 0,571 0,077 0,154 0,154 0,828
0,224 0,500 0,91 1,091 0,551 2,018 0,966 38,136 1,585 2,94 0,134 0,017 0,486 0,785 0,089 0,186 0,186 1,016
0,308 0,600 –1,02 1,484 0,467 2,145 0,974 38,841 1,565 3,66 0,170 0,037 0,626 1,139 0,105 0,232 0,232 1,307
0,428 0,700 –3,21 2,090 0,386 2,317 0,988 39,790 1,539 4,65 0,224 0,074 0,852 1,749 0,129 0,303 0,303 1,769
0,607 0,800 –5,73 3,069 0,310 2,554 1,010 41,051 1,503 6,12 0,308 0,145 1,228 2,877 0,162 0,410 0,411 2,535
0,888 0,900 –8,56 4,762 0,239 2,888 1,043 42,700 1,457 8,43 0,451 0,288 1,911 5,124 0,214 0,595 0,595 3,918
1,350 0,998 –11,72 7,856 0,176 3,361 1,087 44,795 1,399 12,07 0,694 0,607 3,210 10,009 0,289 0,896 0,896 6,472
2,631 1,130 –16,56 17,936 0,104 4,406 1,168 48,536 1,299 21,96 1,419 1,906 7,765 30,624 0,469 1,783 1,783 15,171
7,308 1,285 –23,06 67,104 0,044 6,991 1,292 54,532 1,153 56,62 4,372 10,394 32,820 186,614 0,983 5,371 5,371 60,692
12,599 1,348 –25,95 139,209 0,027 9,068 1,351 57,517 1,084 94,34 7,940 25,512 72,379 509,488 1,407 9,489 9,490 128,999
24,421 1,412 –28,88 345,973 0,015 12,528 1,413 60,817 1,014 176,27 16,364 75,092 192,153 1 771,931 2,149 18,968 18,968 328,203

*
Table 15 — Characteristic values of a two-lobe bearing with Ω = 150°, φ = 300°, h = 5, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°]
F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,342 1,000 1,507 1,787 152,625 1,670 1,25 0,057 0,022 0,170 0,250 0,037 0,079 0,079 0,316
0,035 0,200 –21,77 0,439 0,873 1,522 1,791 153,289 1,663 1,53 0,059 0,023 0,178 0,268 0,038 0,081 0,081 0,331
0,075 0,400 –22,49 0,586 0,745 1,569 1,801 155,324 1,645 1,94 0,065 0,028 0,202 0,331 0,041 0,090 0,090 0,378
0,125 0,600 –23,67 0,815 0,618 1,654 1,819 158,856 1,615 2,53 0,077 0,039 0,251 0,460 0,046 0,106 0,106 0,472
0,196 0,800 –25,32 1,188 0,496 1,786 1,847 164,090 1,571 3,37 0,097 0,061 0,338 0,715 0,054 0,131 0,131 0,637
0,251 0,915 –26,45 1,511 0,430 1,889 1,868 167,965 1,539 4,05 0,115 0,081 0,418 0,964 0,061 0,153 0,153 0,788
0,399 1,122 –28,87 2,460 0,320 2,146 1,918 176,763 1,465 5,88 0,166 0,149 0,665 1,810 0,078 0,216 0,216 1,250
0,696 1,353 –32,07 4,663 0,214 2,590 1,993 189,679 1,360 9,52 0,275 0,335 1,275 4,255 0,109 0,351 0,352 2,370
1,515 1,631 –36,51 12,134 0,116 3,527 2,112 210,062 1,200 19,27 0,599 1,122 3,517 15,724 0,179 0,733 0,733 6,315
2,509 1,782 –39,15 23,260 0,075 4,396 2,188 223,469 1,098 31,15 1,025 2,438 7,137 38,099 0,257 1,262 1,262 12,644
4,858 1,950 –42,16 55,921 0,042 5,948 2,281 240,241 0,974 58,12 2,065 6,958 18,375 127,242 0,393 2,477 2,477 31,393
12,768 2,139 –45,60 212,468 0,017 9,439 2,391 261,315 0,822 150,04 5,946 29,964 77,574 765,144 0,811 7,717 7,717 133,800

4.3 Three-lobe bearings
Characteristic values for three-lobe bearings are listed in Tables 16 to 26.
20 © ISO 2020 – All rights reserved

*
Table 16 — Characteristic values of a three-lobe bearing with Ω = 100°, φ = 240°, h = 3, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,001 0,000 90,00 0,273 1,000 1,842 0,924 38,144 2,472 0,90 0,174 –0,094 0,094 0,173 0,216 0,000 0,000 0,216
0,039 0,200 23,80 0,386 0,837 1,868 0,927 38,548 2,464 1,19 0,219 –0,073 0,125 0,162 0,251 0,025 0,025 0,208
0,080 0,400 18,73 0,554 0,691 1,949 0,932 39,747 2,441 1,57 0,301 –0,053 0,179 0,195 0,309 0,056 0,056 0,234
0,133 0,600 14,43 0,816 0,559 2,092 0,939 41,713 2,404 2,07 0,443 –0,023 0,274 0,291 0,404 0,098 0,098 0,305
0,211 0,800 10,68 1,260 0,438 2,325 0,948 44,413 2,355 2,84 0,709 0,034 0,453 0,506 0,570 0,166 0,166 0,452
0,348 1,000 7,35 2,108 0,325 2,708 0,956 47,817 2,293 4,03 1,282 0,170 0,833 1,025 0,891 0,294 0,294 0,767
0,356 1,008 7,22 2,157 0,321 2,728 0,957 47,967 2,290 4,10 1,318 0,182 0,856 1,062 0,904 0,296 0,296 0,781
0,471 1,106 5,73 2,919 0,269 3,017 0,961 49,898 2,255 4,98 1,894 0,330 1,225 1,619 1,193 0,407 0,407 1,079
0,651 1,203 4,32 4,159 0,217 3,422 0,965 51,968 2,217 6,26 2,934 0,614 1,869 2,673 1,659 0,567 0,567 1,572
0,962 1,302 2,99 6,435 0,166 4,036 0,968 54,242 2,176 8,47 5,115 1,175 3,135 4,925 2,581 0,893 0,893 2,553
1,608 1,401 1,77 11,586 0,115 5,093 0,971 56,678 2,131 12,49 11,078 2,659 6,268 11,255 4,748 1,559 1,559 4,894
2,267 1,450 1,22 17,341 0,089 5,998 0,973 57,943 2,107 16,20 19,121 4,553 10,024 19,899 7,213 2,224 2,223 7,576
3,590 1,500 0,71 30,066 0,063 7,519 0,974 59,274 2,082 23,28 40,819 9,168 19,024 43,378 13,057 3,542 3,542 13,928
7,425 1,550 0,29 74,583 0,034 10,870 0,975 60,645 2,055 42,84 144,496 26,295 52,530 155,346 35,128 8,145 8,145 37,879

22 © ISO 2020 – All rights reserved
*
Table 17 — Characteristic values of a three-lobe bearing with Ω = 100°, φ = 240°, h = 5, B* = 0,75
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,273 1,000 1,583 1,691 153,086 2,550 0,91 0,133 –0,047 0,047 0,133 0,115 0,000 0,000 0,115
0,027 0,200 15,76 0,360 0,856 1,603 1,692 153,715 2,544 1,16 0,165 –0,035 0,063 0,122 0,134 0,011 0,011 0,107
0,055 0,400 12,10 0,478 0,727 1,662 1,693 155,590 2,530 1,48 0,215 –0,023 0,088 0,134 0,162 0,022 0,022 0,113
0,086 0,600 9,23 0,648 0,608 1,764 1,693 158,685 2,507 1,90 0,297 –0,010 0,126 0,172 0,207 0,037 0,037 0,133
0,128 0,800 6,82 0,909 0,496 1,922 1,694 162,973 2,475 2,46 0,439 0,012 0,188 0,252 0,277 0,057 0,057 0,173
0,193 1,003 4,76 1,357 0,388 2,170 1,693 168,518 2,433 3,30 0,714 0,051 0,303 0,422 0,403 0,089 0,089 0,252
0,304 1,202 3,06 2,213 0,286 2,564 1,693 175,098 2,384 4,69 1,328 0,137 0,543 0,820 0,655 0,150 0,150 0,419
0,399 1,301 2,29 3,006 0,236 2,866 1,692 178,787 2,357 5,77 1,985 0,234 0,783 1,260 0,888 0,193 0,193 0,577
0,552 1,401 1,61 4,386 0,185 3,305 1,692 182,789 2,327 7,47 3,299 0,417 1,218 2,143 1,303 0,275 0,275 0,860
0,837 1,500 0,99 7,204 0,134 4,007 1,691 187,022 2,294 10,49 6,483 0,842 2,194 4,318 2,214 0,406 0,406 1,485
1,539 1,600 0,48 15,408 0,081 5,384 1,690 191,569 2,259 17,63 18,498 2,102 5,113 12,486 4,970 0,864 0,864 3,376
2,461 1,650 0,26 28,258 0,054 6,819 1,689 193,944 2,241 26,78 42,402 4,239 10,215 28,881 9,921 1,385 1,385 6,770
5,553 1,700 0,08 82,986 0,027 10,294 1,689 196,386 2,222 54,23 192,433 16,020 34,620 132,053 31,316 2,481 2,481 21,476
18,084 1,730 0,02 427,909 0,009 18,727 1,689 197,883 2,210 167,38 1 835,324 40,205 143,393 1 253,681 179,575 26,759 26,760 123,268

*
Table 18 — Characteristic values of a three-lobe bearing with Ω = 100°, φ = 300°, h = 1, B* = 0,5
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,000 1,000 2,595 0,000 3,629 1,500 1,33 –0,002 –0,400 0,398 0,002 0,801 –0,003 –0,003 0,797
0,055 0,205 60,88 0,148 0,795 2,521 0,097 3,849 1,375 1,71 0,045 –0,037 0,320 0,140 0,081 0,045 0,045 0,639
0,111 0,333 53,05 0,305 0,667 2,547 0,153 4,201 1,299 2,19 0,143 –0,053 0,462 0,314 0,153 0,102 0,103 0,908
0,190 0,444 47,53 0,544 0,556 2,629 0,211 4,640 1,222 2,86 0,245 –0,052 0,717 0,612 0,252 0,218 0,217 1,355
0,303 0,539 42,08 0,915 0,461 2,774 0,266 5,127 1,151 3,80 0,420 –0,048 1,154 1,132 0,398 0,428 0,428 2,147
0,483 0,627 37,06 1,557 0,373 3,013 0,320 5,682 1,083 5,06 0,718 –0,046 1,949 2,128 0,642 0,843 0,843 3,666
0,804 0,712 32,55 2,832 0,288 3,414 0,373 6,323 1,016 6,81 1,200 0,038 3,433 4,467 0,960 1,500 1,499 6,544
1,454 0,792 27,96 5,712 0,208 4,092 0,424 7,043 0,949 9,49 2,075 0,422 6,597 10,934 1,371 2,579 2,577 12,676
3,139 0,869 22,87 14,425 0,131 5,388 0,470 7,864 0,882 15,20 4,458 1,973 16,335 35,501 2,336 5,533 5,534 31,683
10,009 0,940 16,66 59,974 0,060 8,576 0,512 8,764 0,815 35,07 14,961 13,916 70,084 223,140 5,559 18,549 18,552 136,123
27,453 0,972 12,30 214,679 0,028 13,387 0,534 9,236 0,781 80,76 44,473 71,336 271,435 1 206,697 11,931 54,575 54,575 515,176
54,633 0,984 9,80 521,922 0,016 18,496 0,544 9,430 0,767 151,19 94,901 212,980 713,524 3 998,910 20,415 117,661 117,661 1 330,641

24 © ISO 2020 – All rights reserved
*
Table 19 — Characteristic values of a three-lobe bearing with Ω = 100°, φ = 300°, h = 3, B* = 0,5
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,215 1,000 1,806 0,894 52,680 1,612 0,84 0,134 –0,069 0,068 0,134 0,154 0,000 0,000 0,154
0,019 0,116 29,85 0,274 0,899 1,815 0,895 52,855 1,610 1,01 0,123 –0,080 0,060 0,156 0,145 –0,010 –0,010 0,169
0,040 0,239 32,87 0,358 0,797 1,843 0,897 53,420 1,605 1,22 0,117 –0,094 0,056 0,197 0,141 –0,019 –0,019 0,198
0,068 0,370 35,77 0,481 0,694 1,897 0,900 54,446 1,595 1,50 0,118 –0,112 0,058 0,267 0,142 –0,029 –0,029 0,246
0,106 0,510 38,36 0,675 0,589 1,986 0,904 56,016 1,581 1,91 0,127 –0,136 0,069 0,392 0,148 –0,037 –0,037 0,327
0,165 0,657 40,50 1,005 0,480 2,129 0,909 58,178 1,562 2,53 0,149 –0,170 0,100 0,632 0,162 –0,044 –0,044 0,475
0,267 0,809 42,08 1,651 0,368 2,359 0,916 60,954 1,537 3,63 0,189 –0,216 0,179 1,168 0,187 –0,044 –0,044 0,772
0,473 0,956 42,91 3,150 0,255 2,744 0,923 64,156 1,508 5,81 0,262 –0,265 0,419 2,648 0,224 –0,017 –0,017 1,489
1,027 1,081 42,25 8,049 0,145 3,493 0,929 67,313 1,478 11,64 0,422 –0,159 1,448 9,002 0,273 0,144 0,144 3,911
3,271 1,116 36,26 35,559 0,056 5,323 0,932 68,528 1,462 37,27 1,153 2,265 9,268 66,509 0,346 1,185 1,185 18,731
8,357 1,075 27,90 125,553 0,025 7,913 0,931 67,772 1,463 94,83 3,284 12,987 39,361 366,873 0,543 4,082 4,082 72,981
15,524 1,049 22,32 293,662 0,014 10,463 0,931 67,277 1,465 172,43 6,371 38,065 97,976 1 192,747 0,708 7,454 7,454 169,363

*
Table 20 — Characteristic values of a three-lobe bearing with Ω = 100°, φ = 300°, h = 5, B* = 0,5
P,1
0,max
*
* * * * * * * * * * * * * *
So ε β [°] F
pS⋅ o h Q Q Q ΔT c c c c d d d d
max f 3 max
min P 2 11 12 21 22 11 12 21 22
0,000 0,000 90,00 0,228 1,000 1,538 1,663 215,961 1,659 0,84 0,110 –0,037 0,037 0,110 0,088 0,000 0,000 0,088
0,013 0,107 20,81 0,281 0,900 1,544 1,662 216,196 1,659 1,00 0,100 –0,044 0,032 0,125 0,083 –0,005 –0,004 0,097
0,028 0,218 23,43 0,352 0,800 1,563 1,662 216,941 1,656 1,21 0,093 –0,052 0,028 0,151 0,078 –0,009 –0,009 0,111
0,047 0,334 26,26 0,453 0,699 1,598 1,662 218,261 1,651 1,49 0,090 –0,062 0,025 0,193 0,076 –0,014 –0,014 0,134
0,072 0,459 29,28 0,606 0,597 1,657 1,662 220,298 1,644 1,89 0,090 –0,076 0,025 0,267 0,075 –0,020 –0,020
...