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1、INTERNATIONAL STANDARD IS0 12129-2 First edition 1995-04-01 Plain bearings - Part 2: Tolerances on form and position and surface roughness for shafts, flanges and thrust collars Paliers lisses - Partie 2: Tolkances de forme et de position et rugositk de surface des arbres, collerettes et co/lets de
2、butee Reference number IS0 12129-2:1995(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:52:03 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0
3、12129-2:1995(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 subje
4、ct 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
5、) 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 Stand
6、ard IS0 12129-2 was prepared by Technical Committee lSO/TC 123, Plain bearings, Subcommittee SC 3, Dimensions, tolerances and construction details. IS0 12129 consists of the following parts, under the general title Plain bearings: - Part I: Fits - Part 2: Tolerances on form and position and surface
7、roughness for shafts, flanges and thrust collars 0 IS0 1995 All rights reserved. Unless otherwise specrfred, no part of thus pubkation may be reproduced or utrlrzed In any form or by any means, electronrc or mechanrcal, including photocopying and mrcrofilm, without permrssron In wrrtrng from the pub
8、lisher. lnternatronal Organrzatron for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed In Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007
9、 20:52:03 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 12129-2:1995(E) Plain bearings - Part 2: Tolerances on form and position and surface roughness for shafts, flanges and thrust collars 1 Scope This part of IS0 12129 specifies toleranc
10、es on form and position as well as the surface roughness of shafts, flanges and thrust collars as used in plain bearing units. It is applicable to journal or thrust plain bearing units or to a combination of both, installed ei- ther horizontally or vertically. This part of IS0 12129 is not applicabl
11、e to crankshaft bearing units in combustion engines. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 12129. At the time of publication, the editions indicated were valid. All standards are subject to r
12、evision, and parties to agreements based on this part of IS0 12129 are encouraged to investi- gate the possibility of applying the most recent edi- tions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 7902-I :- I, Hydrodyna
13、mic plain journal bearings under steady-state conditions - Circular cylindrical bearings - Part 7: Calculation procedure. IS0 7902-2:-l), Hydrodynamic plain journal bearings under steady-state conditions - Circular cylindrical bearings - Part 2: Functions used in the calculation procedure. IS0 7902-
14、3:-l), Hydrodynamic plain journal bearings under steady-stare conditions - Circular cylindrical bearings - Part 3: Permissible operational parame- ters. IS0 12301:1992, Plain bearings - Quality control techniques and inspection of geometrical and material quality characteristics. 3 General Specifica
15、tions for use in thick-wall plain journal bearings are based on a minimum wail thickness di- ameter ratio greater than or equal to 0.11 (reference value). The reliability of a plain bearing is not only a function of the proper selection of material and fit, but de- pends in particular on the quality
16、 of the shafts, flanges and thrust collars used in the plain bearing unit. The spread of the accuracy grade is based on the minimum lubricant film thickness &, in micrometers, calculated for each particular application in accordance with parts 1 to 3 of IS0 7902. 4 Dimensions See figures 1 to 4 and
17、table 1. The illustrations show plain bearings in the horizontal position. 1) To be published. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:52:03 MDTNo reproduction or netw
18、orking permitted without license from IHS -,-,- IS0 12129-2:1995(E) Figure 1 - Shaft for journal bearings - A Figure 2 - Shaft with two flanges for journal thrust bearings, capable of carrying load on both sides - B Figure 3 - Shaft with thrust collar for journal thrust bearings, capable of carrying
19、 load on both sides - C Figure 4 - Shaft with flange or thrust collar for journal thrust bearings, capable of carrying load on one side - D Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 0
20、4/27/2007 20:52:03 MDTNo reproduction or networking permitted without license from IHS -,-,- Q IS0 Table 1 ISO 1ixzw:1995E) Feature/parameter on drawing Lubricating film thickness Roundness tolerance Cylindrical form ) Straightness tolerance Parallelism tolerance Runout tolerance Accuracy grade 5 10
21、 20 30 h,m 5b lO IO h, 20 2og h, 30 &la 30 t, mm 0,004 0,006 0,Ol 0,015 t2 mm 0,005 0,Ol 0,015 0,02 t3 mm 0,015 0,02 0.03 0.04 t4 mm 0,006 0,008 0,012 0,018 Flatness tolerance*) t, mm 0,006 I 0,008 I 0,012 T 0,018 Concentricity tolerance ts mm 3) 3) 3) 3) 0.4 0,4 0,63 0.8 Surface roughness”) R, w 4
22、elm 23 4 5 6,3 1) For reasons of measurement techniques and economrc considerations, the cylindrical form has been toleranced for charactenstics of roundness, straightness and parallelism. 2) The restnctive specification “not concave” on figures 2 to 4 shall be observed. 3) The concentricity toleran
23、ce is a function of the specific operating conditions and thus is subject to agreement. 4) The specificatron of the surface roughness shall be based on R, or I?, subject to agreement. 5 Design 6 Testing For reasons of production engineering, the curved transition on the shaft between the radial part
24、 and the axial part can also be made as an undercut. Given the great number of possible bearing seals, no details can be indicated with regard to the area of the sealing zone. The geometry and surface finish of the shafts, flanges and thrust collars shall be specified as a function of the bearing se
25、al selected. Testing of the quality characteristics shall be carried out in accordance with IS0 12301. 7 Designation Designation of the tolerances on form and position as well as of the surface roughness of a shaft with two flanges at the position of a journal thrust bearing ca- pable of carrying lo
26、ad on both sides (B) (see figure 2), accuracy grade 20: Plain bearing IS0 12129 - B20 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:52:03 MDTNo reproduction or networking pe
27、rmitted without license from IHS -,-,- IS0 12129-2:1995(E) ICS 21.100.10 Descriptors: bearings, plain bearings, shafts (rotating), flanges, bearing collars, form tolerances, tolerances of posttlon, surface propertles Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:52:03 MDTNo reproduction or networking permitted without license from IHS -,-,-
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