1、BRITISH STANDARD BS4480-2: 1974 Specification for Plain bearings: metric series Part2: Solid plastics bushes UDC 621.822.5:678.067462.3BS4480-2:1974 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee,was published underthe authority of the Executive
2、Board on 23August1974 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference MEE/119 Draft for comment72/36611 ISBN 0 580 08177 X Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standa
3、rd was prepared, consists of representatives from the following Government departments and professional and industrial organizations: Associated Offices Technical Committee Department of Trade and Industry Association of Consulting Engineers National Engineering Laboratory* Association of Hydraulic
4、Equipment Electricity Supply Industry in England and Manufacturers Ltd Wales Association of Mining Electrical and Engineering Equipment Users Association Mechanical Engineers Federation of Manufacturers of Construction British Compressed Air Society Equipment and Cranes British Electrical and Allied
5、 Manufacturers Institution of Gas Engineers Association Institution of Heating and Ventilating British Gas Corporation Engineers British Gear Manufacturers Association Institution of Mechanical Engineers* British Internal Combustion Engine Institution of Plant Engineers Manufacturers Association* In
6、stitution of Production Engineers* British Mechanical Engineering London Transport Executive Confederation Machine Tool Trades Association British Pump Manufacturers Association Ministry of Defence British Steel Corporation Ministry of Defence, Army Department British Steel Industry National Coal Bo
7、ard Crown Agents for Oversea Governments and Process Plant Association Administrations Railway Industries Association of Great Britain Department of Employment (HM Factory Royal Institute of British Architects Inspectorate) Telecommunication Engineering and Department of the Environment Manufacturin
8、g Association Department of Trade and Industry The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard. Association
9、 of Bronze and Brass Founders Ministry of Defence, Navy Department British Metal Sinterings Association Society of Motor Manufacturers and Traders British Plastics Federation Ltd Copper Development Association Individual companies Motor Cycle Association of Great Britain Amendments issued since publ
10、ication Amd. No. Date of issue CommentsBS4480-2:1974 BSI 08-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Material 1 5 Dimensions 1 6 Limits and tolerance 2 7 Ordering 2 Appendix A Guidelines to the selection of plastics pla
11、in bushes 9 Figure 1 Plain bush 7 Figure 2 Flanged bush 8 Table 1 Dimensions and tolerances of low interference bushes 3 Table 2A Dimensions and tolerances of Type1 medium interference bushes 4 Table 2B Dimensions and tolerances of Type2 medium interference bushes 5 Table 3 Dimensions and tolerances
12、 of high interference bushes 6 Table 4 Dimensions of flanged bushes 7 Table 5 Additional clearance obtained by change of journal tolerance 11 Publications referred to Inside back coverBS4480-2:1974 ii BSI 08-1999 Foreword This part of this British Standard has been prepared under the authority of th
13、e Mechanical Engineering Industry Standards Committee at the request of industry in order to provide a range of standard metric bearing sizes. The sizes specified have been based on the latest ISO agreements for plain bearings made from sintered metal. The list of standards in this metric series is
14、as follows: BS4480 Plain bearings: metric series Part1: Sintered bronze bushes; Part2: Solid plastics bushes; Part3: Solid copper alloy bushes (in course of preparation). In order that all normally used plastics materials may be covered by the standard, three separate tables of dimensions and tolera
15、nces have been included. It is intended that manufacturers shall be free to indicate to which of the tables particular types of bearings conform (seeA.4). It is hoped that the guidelines to selection given in Appendix A will provide sufficient information for users to be able to gain a general idea
16、of the range of factors which are relevant to the correct selection of plastics bushes. It is hoped that they will then be in a better position to enter into useful discussions about particular requirements with suppliers. A British Standard does not purport to include all the necessary provisions o
17、f a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to12, an inside ba
18、ck cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4480-2:1974 BSI 08-1999 1 1 Scope This part of BS4480 specifies the dimensions and tolerances for plain a
19、nd flanged plastics bearing bushes in the range3mm to60mm inside diameter. 2 References The titles of the British Standards referred to in this standard are listed on the inside back cover. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.1 bearing an elemen
20、t of a mechanism which provides support and location for a moving part with respect to other parts of the mechanism, and allows force to be transmitted between them 3.2 plain bearing a bearing with wholly sliding surfaces (i.e.with no balls or rollers) 3.3 bush a bearing in the form of a complete (3
21、60 ) tube 3.4 plain bush a bush without a flange (seeFigure 1) 3.5 flanged bush a bush with a flange at one end, so that there is a surface at right angles to the axis to provide a location and to serve as part of a light thrust bearing (see Figure 2) 3.6 journal bearing a plain bearing in which the
22、 relatively sliding surfaces are cylindrical and the motion is rotary. (The load is at right angles to the axis of rotation, i.e.radial) 3.7 journal that part of a shaft or axle which forms the inner cylinder of a journal bearing and which rotates relative to it. (It is a portion of a larger unit, e
23、.g.a crankshaft or lineshaft, and it is preferred that the term “shaft” be kept for the whole unit) 3.8 bearing bore the working surface surrounding the journal 3.9 bearing housing the member into which a bearing is fitted 3.10 bearing clearance the space between the journal and the bearing bore, de
24、fined by the difference between their diameters 3.11 bearing width the overall dimension of a bush, measured axially (including the flange, in the case of a flanged bush) 3.12 upper deviation the algebraical difference between the maximum limit of size and the corresponding basic size 3.13 lower dev
25、iation the algebraical difference between the minimum limit of size and the corresponding basic size 3.14 thermoplastic a plastics material capable of being softened by heating and hardened by cooling; these phenomena are repeatable 3.15 thermoset a plastics material which does not soften significan
26、tly on heating to temperatures below its decomposition temperature 3.16 thermosetting having the property of becoming thermoset on the application of sufficient heat (curing) 4 Material Any suitable thermosetting or thermoplastics material may be used (seealsoA.2). 5 Dimensions There are three princ
27、ipal groups of materials, each requiring different minimum interference and minimum clearance conditions. The dimensions of the bushes for each of these groups are given in Table 1 to Table 3. The additional dimensions for flanged bushes are given in Table 4.BS4480-2:1974 2 BSI 08-1999 In the case o
28、f bushes requiring medium interference (Table 2) it has been necessary to include two types to allow for different methods of manufacture and different conditions of use. It should be noted that it is intended that bearing suppliers should indicate the number of the table to which a particular type
29、of bush conforms. (SeealsoA.4 andA.5.) 6 Limits and tolerance 6.1 Diameters. The limits of tolerance on diameters are given in Table 1 to Table 3. The limits on internal diameter directly affect bearing performance and should be checked with the bearing inserted in a suitable housing or ring gauge m
30、anufactured within H5 limits. (Seealso note to Table 1.) 6.2 Width. The limits of tolerance on the width of bushes shall be 0.25mm. 6.3 Housing. The limits on housings shall be as given in the tables. 6.4 Journal diameter. The standard limits of tolerance on the journal diameter given in the tables
31、are based on BS4500 “h7” limits. (SeealsoA.5 for the effect of using other standard limits.) 6.5 Flanges. The tolerance on the thickness and diameter of flanges shall be to j s 13limits. 6.6 Concentricity. The concentricity tolerance (fullindicated movement, seeBS308-1) of the outside diameter with
32、respect to the inside diameter shall be in accordance with the following values. These values are generally in agreement with the IT9 tolerance grade related to the inside diameter of the bush. 7 Ordering When ordering plastics bearing bushes to this standard, the customer should specify the followi
33、ng particulars in the order shown. a) The number of this British Standard, i.e.BS4480-2. b) The nominal inside diameter. c) The nominal outside diameter. d) The width. e) The material and relevant table number. f) Whether plain or flanged. Inside diameter Concentricity (full indicated movement) mm 3
34、 4- 6 7- 0 12-18 20-30 32-40 42-60 mm 0.025 0.030 0.036 0.043 0.052 0.062 0.074BS 4480-2:1974 BSI 08-1999 3 Table 1 Dimensions and tolerances of low interference bushes All dimensions are in millimetres 1 2A 3A 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Inside diameter Outside diameters Limits on housi
35、ng diameter (SeeNote2) Limits on journal diameter (h7) Interference Clearance (SeeNote1) Widths Nominal Limits Nominal Limits before fitting (SeeNote3) after fitting upper deviation lower deviation upper deviation lower deviation D 1 D 2 D 3 upper deviation lower deviation upper deviation lower devi
36、ation upper deviation lower deviation max. min. max. min. 6 7 8 9 10 +0.22 +0.16 +0.19 +0.04 13 9 10 11 12 14 10 11 12 14 16 +0.12 +0.05 +0.018 0 0 0.015 0.12 0.03 0.21 0.04 4-6-10 5-8-10 6-8-12 6- 8-14 8-10-16 12 14 15 16 18 +0.27 +0.20 +0.22 +0.05 15 17 18 19 21 16 18 19 20 22 18 20 21 22 24+0.15
37、+0.07 +0.021 0 0 0.018 0.15 0.05 0.24 0.05 8-12-20 10-14-20 10-15-25 12-16-25 12-18-30 20 22 25 28 30 +0.31 +0.23 +0.24 +0.06 24 26 29 32 34 25 27 30 33 35 26 28 32 36 38+0.17 +0.09 +0.025 0 0 0.021 0.17 0.07 0.26 0.06 15-20-25-30 15-20-25-30 20-25-30-35 20-25-30-40 20-25-30-40 32 35 38 40 +0.37 +0.
38、29 +0.28 +0.08 36 39 42 45 38 41 44 46 40 45 48 50+0.21 +0.11 +0.025 0 0 0.025 0.21 0.09 0.31 0.08 20-25-30-40 25-35-45-50 25-35-45-55 30-40-50-60 42 45 48 50 +0.41 +0.34 +0.30 +0.10 47 50 53 55 48 51 55 58 52 55 58 60+0.24 +0.14 +0.030 0 0 0.025 0.24 0.11 0.33 0.10 30-40-50-60 35-45-55-65 35-50-60-
39、70 35-50-70-75 55 60 +0.53 +0.41 +0.39 +0.12 60 65 63 68 65 72 +0.29 +0.17 +0.030 0 0 0.030 0.29 0.14 0.42 0.12 40-55-70-80 50-60-70-90 NOTE 1Maximum clearances have been calculated for the wall thickness of the D 3series of outside diameters. The range of clearance for the D 1series will be reduced
40、 by a third to a quarter, the minimum clearance remaining the same. NOTE 2Limits on housing diameters (columns9 and10) may not conform exactly to H7 because of the range of bush outside diameters included in each group. NOTE 3Although it is recommended that the limits of tolerance on inside diameter
41、 be checked after fitting (see6.1), it is possible to inspect Table 1 bearings (because of their relative dimensional stability) on the basis of the limits specified before fitting.BS 4480-2:1974 4 BSI 08-1999 Table 2A Dimensions and tolerances of Type1 medium interference bushes All dimensions are
42、in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Inside diameter Outside diameters Nominal Limits after fitting Nominal Limits Limits on housing diameter (SeeNote2) Limits on journal diameter (h7) Interference Clearance (SeeNote1) Widths upper deviation lower deviation D 1 D 2 D 3 upper devi
43、ation lower deviation upper deviation lower deviation upper deviation lower deviation max. min. max. min. 3 +0.07 +0.03 5 6 +0.07 +0.05 +0.012 0 0 0.010 0.07 0.04 0.08 0.03 3-4 4 5 6 +0.11 +0.04 7 8 9 8 9 10 +0.09 +0.06 +0.015 0 0 0.012 0.09 0.04 0.12 0.04 3-4- 6 4- 5- 8 4- 6-10 7 8 9 10 +0.15 +0.05
44、 13 10 11 12 14 11 12 14 16 +0.12 +0.07 +0.018 0 0 0.015 0.12 0.05 0.17 0.05 5- 8-10 6- 8-12 6-10-14 8-10-16 12 14 15 16 18 +0.22 +0.08 15 17 18 19 21 16 18 19 20 22 18 20 21 22 24 +0.15 +0.08 +0.021 0 0 0.018 0.15 0.06 0.22 0.08 8-12-20 10-14-20 10-15-25 12-16-25 12-18-30 20 22 25 28 30 +0.36 +0.13
45、 24 26 29 32 34 25 27 30 33 35 26 28 32 36 38 +0.21 +0.10 +0.025 0 0 0.021 0.21 0.07 0.38 0.13 15-20-25-30 15-20-25-30 20-25-30-35 20-25-30-40 20-25-30-40 32 35 38 40 +0.44 +0.16 36 39 42 45 38 41 44 46 40 45 48 50 +0.26 +0.12 +0.025 0 0 0.025 0.26 0.09 0.47 0.16 20-25-30-40 25-35-45-50 25-35-45-55
46、30-40-50-60 42 45 48 50 +0.50 +0.19 47 50 53 55 48 51 55 58 52 55 58 60 +0.33 +0.15 +0.030 0 0 0.025 0.33 0.12 0.53 0.19 30-40-50-60 35-45-55-65 35-50-60-70 35-50-70-75 55 60 +0.53 +0.22 60 65 63 68 65 72 +0.41 +0.18 +0.030 0 0 0.030 0.41 0.15 0.50 0.22 35-50-70-75 40-55-70-80 NOTE 1Maximum clearanc
47、es have been calculated for the wall thickness of the D 3series of outside diameters. The range of clearance for the D 1series will be reduced by a third to a quarter, the minimum clearance remaining the same. NOTE 2Limits on housing diameters (columns9 and10) may not conform exactly to H7 because o
48、f the range of bush outside diameters included in each group.BS 4480-2:1974 BSI 08-1999 5 Table 2B Dimensions and tolerances of Type2 medium interference bushes All dimensions are in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Inside diameter Outside diameters Nominal Limits after fitting
49、Nominal Limits Limits on journal diameter (SeeNote2) Limits on journal diameter (h7) Interference Clearance (SeeNote1) Widths upper deviation lower deviation D 1 D 2 D 3 upper deviation lower deviation upper deviation lower deviation upper deviation lower deviation max. min. max. min. 3 +0.17 +0.03 5 6 +0.12 +0.05 +0.012 0 0 0.010 0.12 0.04 0.18 0.03 3-4 4 5 6 +0.21 +0.04 7 8 9 8 9 10 +0.14 +0.06 +0.015 0 0 0.012 0.14 0.04 0.22 0.04 3-4-6 4-5-8 4-6-10 7 8 9 10 +0.25 +0.05 13 10 11 12 14 11 12 14 16 +0.17 +0.07 +0.018 0 0
