1、BRITISH STANDARD BS ISO 12129-2:1995 Implementation of ISO 12129-2:1995 Plain bearings Part 2: Tolerances on form and position and surface roughness for shafts, flanges and thrust collarsBSISO 12129-2:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard,
2、 was published underthe authority of the Standards Board and comes intoeffect on 15 September 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference MCE/12 Draft for comment 92/86195 DC ISBN 0 580 24687 6 Committees responsible for this British Standar
3、d The preparation of this British Standard was entrusted to Technical Committee MCE/12, Plain bearings, upon which the following bodies were represented: Association of Bronze and Brass Founders British Plastics Federation Copper Development Association Institution of Diesel and Gas Turbine Engineer
4、s Institution of Mechanical Engineers Society of Motor Manufacturers and Traders Ltd. Amendments issued since publication Amd. No. Date CommentsBSISO 12129-2:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iii Text of ISO 12129-2 1BSISO 12129-
5、2:1995 ii BSI 01-2000 National foreword This British Standard reproduces verbatim ISO12129-2:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Engineering Sector Board whose Technical Committee MCE/12 has the responsibility to: aid enqu
6、irers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards,
7、as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W44AL A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Britis
8、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had
9、amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO 12129-2:1995(E) ii BSI 01-2000 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 General 1 4 Dimensions 1 5 Design 3 6 Testing 3 7 Designation 3 Figure 1 Shaft for journal bearings A 1
10、Figure 2 Shaft with two flanges for journal thrust bearings, capable of carrying load on both sides B 1 Figure 3 Shaft with thrust collar for journal thrust bearings, capable of carrying load on both sides C 2 Figure 4 Shaft with flange or thrust collar for journal thrust bearings, capable of carryi
11、ng load on one side D 2 Table 1 2ISO 12129-2:1995(E) BSI 01-2000 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technic
12、al 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. ISO collaborates closely wi
13、th 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 least75% of th
14、e member bodies casting a vote. International Standard ISO12129-2 was prepared by Technical Committee ISO/TC123, Plain bearings, Subcommittee SC3, Dimensions, tolerances and construction details. ISO12129 consists of the following parts, under the general title Plain bearings: Part 1: Fits; Part 2:
15、Tolerances on form and position and surface roughness for shafts, flanges and thrust collars.iv blankISO 12129-2:1995(E) BSI 01-2000 1 1 Scope This part of ISO12129 specifies tolerances on form and position as well as the surface roughness of shafts, flanges and thrust collars as used in plain beari
16、ng units. It is applicable to journal or thrust plain bearing units or to a combination of both, installed either horizontally or vertically. This part of ISO12129 is not applicable to crankshaft bearing units in combustion engines. 2 Normative references The following standards contain provisions w
17、hich, through reference in this text, constitute provisions of this part of ISO12129. 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 ISO12129 are encouraged to investigate the possibility of applyi
18、ng the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 7902-1:, Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings Part 1: Calculation procedure 1) . ISO 7902
19、-2:, Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings Part 2: Functions used in the calculation procedure 1) . ISO 7902-3:, Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings Part 3: Permissible operational p
20、arameters 1) . ISO 12301:1992, Plain bearings Quality control techniques and inspection of geometrical and material quality characteristics. 3 General Specifications for use in thick-wall plain journal bearings are based on a minimum wall thickness diameter ratio greater than or equal to0,11 (refere
21、nce value). The reliability of a plain bearing is not only a function of the proper selection of material and fit, but depends in particular on the quality 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 fil
22、m thickness h 0 , in micrometers, calculated for each particular application in accordance with parts1to3of ISO7902. 4 Dimensions See Figure 1 toFigure 4 andTable 1. The illustrations show plain bearings in the horizontal position. 1) To be published. Figure 1 Shaft for journal bearings A Figure 2 S
23、haft with two flanges for journal thrust bearings, capable of carrying load on both sides BISO 12129-2:1995(E) 2 BSI 01-2000 Table 1 Figure 3 Shaft with thrust collar for journal thrust bearings, capable of carrying load on both sides C Figure 4 Shaft with flange or thrust collar for journal thrust
24、bearings, capable of carrying load on one side D Feature/parameter on drawing Accuracy grade 5 10 20 30 Lubricating film thickness h 04m 5 u h 0 10 10 u h 0 20 20 u h 0 30 h 0W 30 Roundness tolerance t 1mm 0,004 0,006 0,01 0,015 Cylindrical form a Straightness tolerance t 2mm 0,005 0,01 0,015 0,02 P
25、arallelism tolerance t 3mm 0,015 0,02 0,03 0,04 Runout tolerance t 4mm 0,006 0,008 0,012 0,018 Flatness tolerance b t 5mm 0,006 0,008 0,012 0,018 Concentricity tolerance t 6mm c c c c Surface roughness d R a4m 0,4 0,4 0,63 0,8 R z4m 2,5 4 5 6,3 a For reasons of measurement techniques and economic co
26、nsiderations, the cylindrical form has been toleranced for characteristics of roundness, straightness and parallelism. b The restrictive specification “not concave” on Figure 2 to Figure 4 shall be observed. c The concentricity tolerance is a function of the specific operating conditions and thus is
27、 subject to agreement. d The specification of the surface roughness shall be based on R aor R z , subject to agreement.ISO 12129-2:1995(E) BSI 01-2000 3 5 Design For reasons of production engineering, the curved transition on the shaft between the radial part and the axial part can also be made as a
28、n 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 seal selected. 6 Testing Testing of the qua
29、lity characteristics shall be carried out in accordance with ISO12301. 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 capable of carrying load on both sides (B) (seeFigure 2)
30、, accuracy grade20: Plain bearing ISO12129 B20BS ISO 12129-2:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It
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