1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 2: Boundary dimensions, tolerances and characteristics of inch series bearingsICS 21.100.20Rol
2、ling bearings Instrument precision bearings BRITISH STANDARDBS ISO 1224-2:2007BS ISO 1224-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580 56532 8Amendments issued since publicationAmd. No. Date Commen
3、tscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of ISO 1224-2:2007. Together with BS ISO 1224-1:2007 it supersedes BS 3469:1985 which is with
4、drawn.The UK participation in its preparation was entrusted to Technical Committee MCE/7, Rolling bearings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a Reference number
5、ISO 1224-2:2007(E)INTERNATIONAL STANDARD ISO1224-2First edition2007-06-15Rolling bearings Instrument precision bearings Part 2: Boundary dimensions, tolerances and characteristics of inch series bearings Roulements Roulements de prcision pour instruments Partie 2: Dimensions dencombrement, tolrances
6、 et caractristiques, sries inch BS ISO 1224-2:2007ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols . 2 5 Characteristics 4 6 Bearing types 4 7 Boundary dimensions 4 8 Tolerances . 6 8.1 Tolerance class 5A . 6 8.2 Tolerance class 4A . 7 8.3 C
7、hamfer dimension limits 8 9 Radial internal clearance . 9 10 Bore and outside diameter classification 9 11 Torque test conditions . 9 11.1 General. 9 11.2 Test conditions . 9 11.3 Correlation of test results on different types of test equipment . 10 12 Limitations of bearing yield rates . 10 Annex A
8、 (informative) Imperial unit information. 12 BS ISO 1224-2:2007iv 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 technical
9、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 with
10、the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft Interna
11、tional 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. Attention is drawn to the possibility that some of the elements of this document may b
12、e the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1224-2 was prepared by Technical Committee ISO/TC 4, Rolling bearings. This first edition of ISO 1224-2, together with ISO 1224-1, cancels and replaces ISO 1224:1984, which has been t
13、echnically revised. ISO 1224 consists of the following parts, under the general title Rolling bearings Instrument precision bearings: Part 1: Boundary dimensions, tolerances and characteristics of metric series bearings Part 2: Boundary dimensions, tolerances and characteristics of inch series beari
14、ngs BS ISO 1224-2:20071Rolling bearings Instrument precision bearings Part 2: Boundary dimensions, tolerances and characteristics of inch series bearings 1 Scope This part of ISO 1224 specifies the characteristics that define instrument precision rolling bearings, inch series, their types, boundary
15、dimensions, tolerances and internal clearance, classifications used for selective assembly, torque definitions and test condition, and limitations of bearing yield rates. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer
16、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 15, Rolling bearings Radial bearings Boundary dimensions, general plan ISO 582, Rolling bearings Chamfer dimensions Maximum values ISO 1132-1, Rolling
17、bearings Tolerances Part 1: Terms and definitions ISO 5593:1997, Rolling bearings Vocabulary ISO 15241, Rolling bearings Symbols for quantities 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1132-1, ISO 5593 and the following apply. 3.1 perpendicula
18、rity of inner ring bore with respect to the face basically cylindrical surface total variation of the relative position, in a radial direction parallel with the plane tangential to the reference face of the inner ring, of points on the same generatrix of the bore at a distance from the side faces of
19、 the ring equal to 1,2 times the largest axial single chamfer dimension 3.2 axial runout of outer ring flange back face of assembled bearing radial groove ball bearing difference between the largest and the smallest of the axial distances between the back face of the outer ring flange, in different
20、angular positions of this ring, at a radial distance from the outer ring axis equal to half the mean diameter of the flange back face, and a point in a fixed position relative to the inner ring NOTE For a measurement to be valid, the inner and outer ring raceways shall be in contact with all the bal
21、ls. BS ISO 1224-2:20072 3.3 torque quality torque quality of an instrument ball bearing is a function of average and maximum torques NOTE Maximum torque is most frequently specified for slow speed (near zero) applications and for limited arcs of travel. Where considerable rotation is involved, avera
22、ge torque may be the criterion. 3.4 maximum torque maximum value of torque recorded during any test cycle 3.5 average torque arithmetic mean value of the torque readings obtained during the test cycle 3.6 test load specified axial load coincident with the axis of rotation of the bearing 4 Symbols Fo
23、r the purposes of this document, the symbols given in ISO 15241 and the following apply. The symbols (except those for tolerances) shown in Figure 1 and the values given in the Tables 1 to 7 denote nominal dimensions unless specified otherwise. B inner ring width C outer ring width C1outer ring flan
24、ge width D outside diameter of bearing D1outside diameter of outer ring flange d bore diameter Kearadial runout of outer ring of assembled bearing Kiaradial runout of inner ring of assembled bearing r chamfer dimension (except where r1is applicable) rs minsmallest single chamfer dimension of r rs ma
25、xlargest single chamfer dimension of r r1chamfer dimension of front face of angular contact ball bearing inner and outer rings r1s minsmallest single chamfer dimension of r1r1s maxlargest single chamfer dimension of r1SDperpendicularity of outer ring outside surface with respect to the face1)BS ISO
26、1224-2:20073Sdperpendicularity of inner ring face with respect to the bore1)Sdrperpendicularity of inner ring bore with respect to the face1)Seaaxial runout of outer ring of assembled bearing1)Sea1axial runout of outer ring flange back face of assembled bearing1)Siaaxial runout of inner ring of asse
27、mbled bearing1)VBsvariation of inner ring width VCsvariation of outer ring width VC1svariation of outer ring flange width VDmpvariation of mean outside diameter VDspvariation of outside diameter in a single plane Vdmpvariation of mean bore diameter Vdspvariation of bore diameter in a single plane Bs
28、deviation of a single inner ring width Csdeviation of a single outer ring width C1sdeviation of a single outer ring flange width Dmpdeviation of mean outside diameter in a single plane Dsdeviation of a single outside diameter D1sdeviation of a single outside diameter of outer ring flange dmpdeviatio
29、n of mean bore diameter in a single plane dsdeviation of a single bore diameter 1) For angular contact ball bearings, the back face of a ring is the reference face. BS ISO 1224-2:20074 a) Single-row deep groove ball bearings b) Angular contact ball bearings aBroken corner. Figure 1 Instrument precis
30、ion bearing 5 Characteristics Satisfactory performance of instrument precision bearings necessitates that they be produced to special tolerances, as given in Clause 8. In addition, these bearings shall be particularly free from foreign matter and meet one or more specific requirements in the followi
31、ng categories: a) low or uniform torque or both, either at starting or in rotation (this requirement does not apply to bearings with seals); b) smooth running or vibration limitations; c) limitations of bearing yield rates. Due to the many specialized requirements that exist in instrument applicatio
32、ns, specification of these categories should be established only after full agreement between the manufacturer and the customer. 6 Bearing types Single row deep groove ball bearings meet the majority of the requirements and may be open or capped, with or without flanged outer ring. However, for spec
33、ific applications, angular contact ball bearings, non-separable or with separable inner ring, may be required. 7 Boundary dimensions Boundary dimensions for inch series instrument precision bearings are given in Table 1. BS ISO 1224-2:20075Table 1 Inch series bearings Dimensions in millimetres Flang
34、ed bearings d D B and C rs minar1s minaD1C1Applicable types of bearing 0,635 2,54 0,792 0,08 0,08 open 1,016 3,175 1,191 0,08 0,08 open 1,191 3,967 1,588 0,08 0,08 5,16 0,33 open 1,191 3,967 2,38 0,08 0,08 5,16 0,79 capped 1,397 4,762 1,984 0,08 0,08 5,94 0,58 open 1,397 4,762 2,779 0,08 0,08 5,94 0
35、,79 capped 1,984 6,35 2,38 0,08 0,08 7,52 0,58 open 1,984 6,35 3,571 0,08 0,08 7,52 0,79 capped 2,38 4,762 1,588 0,08 0,08 5,94 0,46 open 2,38 4,762 2,38 0,08 0,08 5,94 0,79 capped 2,38 7,938 2,779 0,13 0,08 9,12 0,58 open 2,38 7,938 3,571 0,13 0,08 9,12 0,79 capped 3,175 6,35 2,38 0,08 0,08 7,52 0,
36、58 open 3,175 6,35 2,779 0,08 0,08 7,52 0,79 capped 3,175 7,938 2,779 0,08 0,08 9,12 0,58 open 3,175 7,938 3,571 0,08 0,08 9,12 0,79 capped 3,175 9,525 2,779 0,13 0,08 10,72 0,58 open 3,175 9,525 3,571 0,13 0,08 10,72 0,79 capped 3,175 9,525 3,967 0,3 0,15 11,18 0,76 open, capped3,175 12,7 4,366 0,3
37、 0,15 open, capped3,967 7,938 2,779 0,08 0,08 9,12 0,58 open 3,967 7,938 3,175 0,08 0,08 9,12 0,91 capped 4,762 7,938 2,779 0,08 0,08 9,12 0,58 open 4,762 7,938 3,175 0,08 0,08 9,12 0,91 capped 4,762 9,525 3,175 0,08 0,08 10,72 0,58 open 4,762 9,525 3,175 0,08 0,08 10,72 0,79 capped 4,762 12,7 3,967
38、 0,3 0,15 open 4,762 12,7 4,978 0,3 0,15 14,35 1,07 openb, capped5,555 7,938 2,779 0,08 0,08 open 6,35 9,525 3,175 0,08 0,08 10,72 0,58 open 6,35 9,525 3,175 0,08 0,08 10,72 0,91 capped 6,35 12,7 3,175 0,13 0,08 13,89 0,58 open 6,35 12,7 4,762 0,13 0,08 13,89 1,14 capped 6,35 15,875 4,978 0,3 0,15 1
39、7,53 1,07 open, capped6,35 19,05 5,558 0,41 0,2 open 6,35 19,05 7,142 0,41 0,2 capped 7,938 12,7 3,967 0,13 0,08 13,89 0,79 open, capped9,525 15,875 3,967 0,25 0,13 17,53 1,07 open 9,525 15,875 4,978 0,25 0,13 17,53 1,07 capped 9,525 22,225 5,558 0,41 0,2 open 9,525 22,225 7,142 0,41 0,2 24,61 1,57
40、openb, cappedaMaximum chamfer dimensions are given in Table 6. bOpen bearing with flange only. BS ISO 1224-2:20076 8 Tolerances 8.1 Tolerance class 5A See Tables 2 and 3. Table 2 Inner ring Tolerance values in micrometres d dmpdsVdspVdmpBsbVBsKiaSdrcSiamm u high low high low max. max. high low max.
41、max. high low 0,6 a10 0 5 0 5 3 3 0 25 5 3,5 7 7 aThis diameter is included in the group. bThe tolerance for the total width of the inner rings of a matched pair or a matched stack is 0 to 200 m times the number of bearings in the mounting. cPerpendicularity of inner ring face with respect to the bo
42、re (Sd) is ( )ddr1 s max22,4SS d B r= where Sdris obtained from Table 2 and d1is the mean diameter of inner ring face. Table 3 Outer ring Tolerance values in micrometres D DmpDsVDspand VDmpCsb VCsKeaSDSeaSea1C1sVC1sD1smm open capped open capped u high low high low high low max. max. high low max. ma
43、x. max. max. max. high low max. high low2 a18 0 5 0 5 +1 6 3 5 0 25 5 5 8 8 10 0 50 5 0 2518 30 0 6 0 6 +1 7 3 5 0 25 5 6 8 8 10 0 50 5 0 25aThis diameter is included in the group. bThe tolerance for the total width of the outer rings of a matched pair or a matched stack is 0 to 200 m times the numb
44、er of bearings in the mounting. BS ISO 1224-2:200778.2 Tolerance class 4A See Tables 4 and 5. Table 4 Inner ring Tolerance values in micrometres d dmpdsVdspVdmpBsbVBsKiaSdrcSiamm u high low high low max. max. high low max. max. max. max. 0,6 a10 0 5 0 5 2,5 2,5 0 25 2,5 2,5 3 3 aThis diameter is inc
45、luded in the group. bThe tolerance for the total width of the inner rings of a matched pair or a matched stack is 0 to 200 m times the number of bearings in the mounting. cPerpendicularity of inner ring face with respect to the bore (Sd) is ( )ddr1 s max22,4SS d B r= where Sdris obtained from Table
46、4 and d1is the mean diameter of inner ring face. Table 5 Outer ring Tolerance values in micrometres D DmpDsVDspand VDmpCsb VCsKeaSDSeaSea1C1sVC1sD1smm open capped open capped u high low high low high low max. max. high low max. max. max. max. max. high low max. low max.2 a18 0 5 0 5 +1 6 2,5 5 0 25
47、2,5 3,5 4 5 8 0 50 2,5 0 2518 30 0 5 0 5 +1 6 2,5 5 0 25 2,5 4 4 5 8 0 50 2,5 0 25aThis diameter is included in the group. bThe tolerance for the total width of the outer rings of a matched pair or a matched stack is 0 to 200 m times the number of bearings in the mounting.BS ISO 1224-2:20078 8.3 Cha
48、mfer dimension limits The maximum chamfer dimensions corresponding to the minimum chamfer dimensions given in Table 1 are specified in Table 6. Table 6 Maximum chamfer dimensions Dimensions in millimetres rs maxr1s maxd D B and C Radial direction Axial directionRadial direction Axial direction0,635
49、2,54 0,792 0,18 0,18 0,18 0,18 1,016 3,175 1,191 0,18 0,18 0,18 0,18 1,191 3,967 1,588 0,23 0,23 0,18 0,18 1,191 3,967 2,38 0,23 0,3 0,23 0,3 1,397 4,762 1,984 0,23 0,23 0,23 0,23 1,397 4,762 2,779 0,23 0,3 0,23 0,3 1,984 6,35 2,38 0,23 0,3 0,23 0,3 1,984 6,35 3,571 0,23 0,3 0,23 0,3 2,38 4,762 1,588 0,2 0,2 0,2 0,2 2,38 4,762 2,38 0,2 0,3 0,2 0,3 2,38 7,938 2,779 0,3 0,61 0,25 0,25 2,38
