1、BRITISH STANDARD BS 4480-8: 1984 ISO 6864:1984 Plain bearings: metric series Part 8: Specification for dimensions, tolerances and methods of checking of thin-walled flanged half bearings ISO title: Plain bearings Thin-walled flanged half bearings Dimensions, tolerances and methods of checking UDC 62
2、1.822.5BS4480-8:1984 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe authority of the BoardofBSI and comes into effect on 28September 1984 BSI 09-1999 The following BSI references relate to the work on this stan
3、dard: Committee reference MEE/119 Draft for comment 82/74097 DC ISBN 0 580 14002 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Mechanical Engineering Standards Committee (MEE/-) to Technical Committee MEE/119 upon which the following
4、 bodies were represented: Association of Bronze and Brass Founders British Internal Combustion Engine Manufacturers Association British Metal Sinterings Association British Plastics Federation Copper Development Association Department of Trade and Industry (National Engineering Laboratory) Instituti
5、on of Mechanical Engineers International Tin Research Institute London Metal Exchange Motor Cycle Association of Great Britain Plastics and Rubber Institute Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date of issue CommentsBS4480-8:1984 BSI 09-1999
6、 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Symbols 2 5 Main dimensions and tolerances 3 6 Method of checking peripheral length 14 Figure 1 Flanged half bearing 2 Figure 2 Eccentric bore 5 Figure 3
7、a Locating nick 6 Figure 3b Notch recess in the housing 6 Figure 4 Joint face bore relief 7 Figure 5 Flange reliefs 8 Figure 6 Two types of transition between radial part and flange 9 Figure 7 Position of the annular groove and oil hole in the radial part of the bore 10 Figure 8 Preferred groove for
8、ms 11 Figure 9 Groove form on the flange face 12 Figure 10 Oil hole form 13 Figure 11 Fixture for checking peripheral length 14 Table 1 Housing diameter, inside diameters, wall thicknesses, outside diameter of flange and distance between flanges 4 Table 2 Tolerances for measured nip S Nand wall thic
9、kness e T 4 Table 3 Tolerances for distances between flanges, housing width, bearing width, flange thickness and outside diameter of flange 5 Table 4 Dimensions of locating nicks and notch recesses and tolerances for the distance from the locating nick to the flange 7 Table 5 Dimensions and toleranc
10、e of relief of joint face bores 7 Table 6 Dimensions and tolerances of the relief of the flanges 8 Table 7 Minimum height (and width) of transition 9 Table 8 Dimensions and tolerances of grooves on the flange face 12 Table 9 Dimensions and tolerances of oil holes on the flange face 13 Publications r
11、eferred to Inside back coverBS4480-8:1984 ii BSI 09-1999 National foreword This Part of this British Standard which has been prepared under the direction of the Mechanical Engineering Standards Committee, is identical with ISO6864:1984 “Plain bearings Thin-walled flanged half bearings Dimensions, to
12、lerances and methods of checking”, published by the International Organization for Standardization (ISO). The standards in this metric series are as follows: Part1: Sintered bronze bushes; Part2: Solid plastics bushes; Part3: Dimensions and tolerances of solid copper alloy bushes; Part4: Dimensions,
13、 tolerances and methods of checking wrapped bushes; Part5: Dimensions, tolerances and methods of checking thin-walled half bearings; Part6: Specification for dimensions and tolerances of ring type thrust washers made from strip; Part7: Specification for dimensions and tolerances of pressed bimetalli
14、c half thrust washers; Part8: Specification for dimensions, tolerances and methods of checking of thin-walled flanged half bearings. Further Parts will be published as the corresponding International Standards become available, subject to approval by the UnitedKingdom. Terminology and conventions. T
15、he text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a d
16、ecimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words, “International Standard” appear, referring to this standard, they should be read as “British Standard”. With the exception of footnote3 to Table 3, wherever the w
17、ord “should” appears it should be read as “shall”. The Technical Committee has reviewed the provisions of ISO4383, ISO4384 and ISO6282 to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. Cross-references International Standards
18、Corresponding British Standards ISO 497:1973 BS2045:1965 Preferred numbers (Technically equivalent) ISO 3548:1978 BS4480 Plain bearings: metric series Part5:1979 Dimensions, tolerances and methods of checking thin-walled half bearings (Identical) ISO 6526:1983 Part7:1984 Dimensions and tolerances of
19、 pressed bimetallic half thrust washers (Identical)BS4480-8:1984 BSI 09-1999 iii 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 British Standard does not of itself
20、confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated
21、in the amendment table on the inside front cover.iv blankBS4480-8:1984 BSI 09-1999 1 1 Scope and field of application This International Standard lays down the main dimensions and tolerances for thin-walled flanged half bearings used in reciprocating machinery. It is not expected that all flanged ha
22、lf bearings with the main dimensions listed will be available from stock but adoption of standard sizes should lead to economies in tooling costs. The main dimensions and tolerances are fixed for a series of thin-walled flanged half bearings suitable for housings having inside diameters from40 to250
23、mm. Flanged half bearings for larger or smaller inside diameters are only rarely used. This International Standard also lays down dimensions and tolerances for characteristics features of thin-walled flanged half bearings. The introduction of such features into a particular design is a decision that
24、 shall be made by the user in the light of his knowledge of the application. Flanged half bearings are generally used in connection with half bearings without flange according to ISO3548. Alternatively to serve as a flanged half bearing, it is admittedly possible to use a prefitted assembly of a hal
25、f bearing without flange with two half thrust washers, the specifications of which should be agreed between user and manufacturer, taking acount of ISO3548 and ISO6526. NOTEAll the dimensions and tolerances are expressed in millimetres unless otherwise indicated. 2 References ISO497, Guide to the ch
26、oice of series to the use of preferred numbers and of series containing more rounded values of preferred numbers. ISO3548, Plain bearings Thin-walled half bearings Dimensions, tolerances and methods of checking. ISO4383, Plain bearings Metallic multilayer materials for thin-walled plain bearings. IS
27、O4384, Plain bearings Hardness testing of bearing materials. ISO6282, Thin-walled Plain bearings Determination of 0,01 * limit. ISO6526, Plain bearings Pressed bimetallic half thrust washers Features and tolerances. 3 Definition For the purpose of this International Standard, the following definitio
28、n is applicable: flanged bearing a combination of a radial bearing (cylindrical radial part) with an axial bearing (flanges at the ends) (seeFigure 1) BS4480-8:1984 2 BSI 09-1999 4 Symbols Figure 1 Flanged half bearing D L = housing diameter D I = inside diameter of the bearing D bs = outside diamet
29、er of the bearing D 1 = outside diameter of flange D cb = diameter of the checking block bore e T = bearing wall thickness e 1 = flange thickness Z = distance between flanges L L = housing width L 1 = overall bearing width S N or S N1 + S N2= nip F = F 1= F 2= checking load, in newtons E x = eccentr
30、icity A = locating nick width B = locating nick length N D = locating nick height H = distance between nick and flange h = height and width at transition between radial part and flange J = distance between nick and groove E = notch recess width N Z = notch recess length G = notch recess height H D =
31、 height of the joint face bore reliefBS4480-8:1984 BSI 09-1999 3 5 Main dimensions and tolerances All sharp edges should be free of burrs. If chamfers are desired, they should have an angle of45 . 5.1 Nominal dimensions The nominal dimensions of housing (inside) diameter, inside diameter and wall th
32、ickness are given in Table 1. The nominal overall width should be equal to the nominal distance between flanges plus two times the nominal wall thickness. 5.2 Tolerance for the housing Ferrous housings should be manufactured to ISO H6, but in the case of housings made from materials having a high co
33、efficient of expansion, or where other factors such as housing dimensional stability are involved, then the housing size may depart from ISOH6limits but should always be produced in accordance with a grade6tolerance. 5.3 Tolerance for nip and wall thickness The bearings that are the subject of this
34、International Standard are thin and flexible and their outside diameter cannot be measured by conventional means. The peripheral length is therefore usually measured by use of the checking method given in clause10. It is not possible to specify the actual size of peripheral length in this Internatio
35、nal Standard since it will be dependent upon the precise application (for example factors such as housing rigidity and material and operating temperatures, have to be taken into account). However for bearings that are finished by machining on joint faces, the manufacturing tolerances on peripheral l
36、ength should be in accordance with the values of the tolerance on measured nip S N , (see Figure 11) given in Table 2. The tolerance for wall thickness e Tdepends on the fact whether the bearings inside diameter is subject to a final machining operation (i.e.“as machined”) or whether the bearing ins
37、ide diameter is electroplated without further machining (i.e.“as plated”). The relevant tolerances are included in Table 2. Slight surface depressions are acceptable on the outside diameter of the bearing provided that they are not numerous. However, the measurement of the wall thickness shall not b
38、e carried out in these areas. P D = depth of the joint face bore relief e J = wall thickness at the joint face l = height of the flange relief t = depth of the flange relief G W = groove width G E = wall thickness at the back of the groove = groove side angle r 1 = radius at the back of the groove r
39、 2 = oil pocket radius G X = distance between grooves and the flange axis.BS4480-8:1984 4 BSI 09-1999 Table 1 Housing diameter, inside diameters, wall thicknesses, outside diameter of flange and distance between flanges Table 2 Tolerances for measured nip S Nand wall thickness e T Housing diameter a
40、D L Inside diameters, D I,for wall thickness, e T D 1 Z 2,0 2,5 3,0 3,5 4,0 5,0 6,0 40 42 45 48 50 53 56 60 63 36 38 41 44 46 49 52 56 59 35 37 40 43 45 48 51 55 58 52 54 57 60 62 65 68 72 79 15 16 17 18 18 19 20 22 23 17 18 19 21 21 23 24 25 27 21 22 24 25 26 28 29 31 33 67 71 75 80 85 62 66 70 75
41、80 61 65 69 74 79 83 87 91 96 105 24 25 26 28 30 28 29 31 33 35 34 36 38 41 43 90 95 100 105 110 120 84 89 94 99 104 114 83 88 93 98 103 113 110 115 120 129 134 144 31 33 34 36 38 41 37 39 41 43 45 49 45 48 50 53 55 60 125 130 140 150 160 118 123 133 143 153 117 122 132 142 152 149 154 170 180 190 4
42、2 44 47 51 54 50 52 56 60 64 62 65 70 75 80 170 180 190 200 162 172 182 192 160 170 180 190 200 210 220 230 57 60 64 67 68 72 76 80 84 89 94 99 210 220 240 250 200 210 230 240 198 208 228 238 250 260 280 290 70 73 80 83 83 87 95 99 103 108 118 123 a Based on the R 40 series of preferred numbers (ISO
43、497) Housing diameter D L Tolerance for S N (S N max S N min ) Tolerance for e T above up to “as machined” bearing “as plated” bearing 45 0,030 0,008 0,012 45 75 0,035 0,008 0,012 75 110 0,040 0,010 0,015 110 160 0,045 0,015 0,022 160 200 0,050 0,015 0,022 200 250 0,055 0,020 0,030 NOTECloser tolera
44、nces should be subject to agreement between user and manufacturer.BS4480-8:1984 BSI 09-1999 5 5.4 Tolerances for distance between flanges, housing width, bearing width, flange thickness, and outside diameter of flange Table 3 Tolerances for distance between flanges, housing width, bearing width, fla
45、nge thickness, and outside diameter of flange 5.4.1 In general, a dimensional tolerance is only fixed for the flange thickness of the pressure loaded side in order to ensure that these flanges of the upper and lower half bearing approximately have the same thickness. In this case, the position of th
46、ese flanges with respect to the locating nicks is fixed. If the upper and lower half bearings are of the same design, then generally the two flanges of one half bearing must have the same thickness within the tolerance range fixed in Table 3. In that case, the flange thicknesses result from the bear
47、ing width and the distance between flanges. Nevertheless some other tolerance may be accepted after agreement between the user and the manufacturer. 5.4.2 The flange outside diameter should be smaller than the diameter of the shoulder of the shaft. 5.5 Detailed features 5.5.1 Eccentric bore In certa
48、in applications it may be necessary to use flanged half bearings with eccentric bores, i.e.the wall thickness of the half bearing decreases uniformly from the crown to the joint faces (see Figure 2). NOTEThe eccentricity E xis characterized in a radial plane by the distance between the centre C 1of
49、the bearing outside surface and the centre C 2of the bearing bore. E Xis determined by the difference in wall thickness between the crown and the joint faces. It is subject to agreement between user and manufacturer. Housing diameter D L Tolerance for above up to Z ac L L L 1 e 1 bc D 1 75 0,02 0,07 1 75 110 0,02 0,07 110 250 0,02 0,10 1,5 a In free state. b On the pressure loaded side (see5.4.1). c The tolerances should not be added; they represent the permissibl
