1、BRITISH STANDARD BS 5186:1975 Specification for Shaft centre heights UDC 621.824BS5186:1975 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee,was published underthe authority of theExecutive Board on 28February1975 BSI 12-1999 The following BSI refe
2、rences relate to the work on this standard: Committee reference MEE/12 Draft for comment 67/25657 ISBN 0 580 08781 6 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the fo
3、llowing Government departments and professional and industrial organizations: Associated Offices Technical Committee Association of Consulting Engineers Association of Hydraulic Equipment Manufacturers Ltd. Association of Mining Electrical and Mechanical Engineers British Compressed Air Society Brit
4、ish Electrical and Allied Manufacturers Association British Gas Corporation British Gear Manufacturers Association* British Internal Combustion Engine Manufacturers Association British Mechanical Engineering Confederation British Pump Manufacturers Association* British Steel Corporation British Stee
5、l Industry Crown Agents for Oversea Governments and Administration Department of Employment (HM Factory Inspectorate) Department of the Environment Department of Industry Mechanical Engineering Department of Industry National Engineering Laboratory Department of Trade Electricity Supply Industry in
6、England and Wales Engineering Equipment Users Association* Federation of Manufacturers of Construction Equipment and Cranes Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers Institution of Plant Engineers Institution of Production Engin
7、eers London Transport Executive Machine Tool Trades Association Ministry of Defence* National Coal Board Process Plant Association Railway Industry Association of Great Britain Royal Institute of British Architects Society of Motor Manufacturers and Traders Telecommunication Engineering and Manufact
8、uring Association The Government Department and industrial organizations marked with an asterisk in the above list were directly represented on the committee entrusted with the preparation of this British Standard. Amendments issued since publication Amd. No. Date of issue CommentsBS5186:1975 BSI 12
9、-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Reference 1 3 Definition 1 4 Dimensions 1 5 Tolerances 1 6 Erection procedure 1 Figure 1 Illustration of shaft centre heights 1 Figure 2 Driving and driven machines showing relationship ofinsulatingliners and
10、 shims 3 Table 1 Shaft centre heights for driving and driven machines 2 Table 2 Tolerances on shaft heights 4 Table 3 Maximum parallelism error 4 Publications referred to Inside back coverBS5186:1975 ii BSI 12-1999 Foreword This British Standard has been prepared under the authority of the Mechanica
11、l Engineering Industry Standards Committee and forms one of a series of standards for elements of driving and driven machines. Others in the series include BS4235, “Metric keys and keyways”, BS4506, “Shaft ends” and BS4823, “Guide to the selection of fitment bores for cylindrical shaft ends”; all ar
12、e based on corresponding ISO Recommendations. This specification is technically in accordance with the metric section of ISO496, “Driving and driven machines Shaft heights”. The text has been edited to comply more closely with English usage. A British Standard does not purport to include all the nec
13、essary provisions of 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, pages i and ii, page
14、s1 to 4, 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 in the amendment table on the inside front cover.BS5186:1975 BSI 12-1999 1 1 Scope This British Standard relates to shaft centre height
15、s of25mm and above for driving and driven machines. It specifies four series of shaft centre heights. 2 Reference The title of the British Standard referred to in this standard is given on the inside back cover. 3 Definition For the purposes of this British Standard the following definition applies:
16、 shaft centre height the distance, measured on the machine ready for delivery, between the centre-line of the shaft and the base plane of the machine itself. It does not include metallic shims and/or packing pieces used for assembly, but when a non-metallic non-conducting packing piece is supplied w
17、ith the machine, the thickness of that packing piece shall be included in the shaft centre height. SeeFigure 1 andFigure 2. 4 Dimensions 4.1 Nominal shaft centre heights shall conform to the dimensions given inTable 1. Selection shall preferably be made from series1, which is the first choice, but i
18、f these values are not suitable for the particular application, selection should be attempted from series2, series3 and series4 in that order. 4.2 The values in the four series correspond respectively, with some rounding, to the values of the preferred number series R5, R10, R20 and R40 as given in
19、BS2045. 5 Tolerances 5.1 Shaft centre height. The tolerances on shaft centre height given inTable 2 relate to directly coupled machines. They apply at all points along the length of the shaft. 5.1.2 Tolerances to suit special circumstances, e.g.to take account of variation in centre height due to th
20、ermal expansion during operation or when, during assembly, allowance has to be made in the alignment for deflection of the shaft, should be the subject of special agreement between the supplier and the purchaser. 5.2 Parallelism tolerance. This shall be as given inTable 3. The parallelism tolerance
21、is the permissible difference in height above the base plane of two points on the axis of the shaft. These points should normally be at the two ends of the shaft, but where this is impracticable, any two convenient points may be taken and the resulting measured value shall be increased in the ratio
22、of the shaft length to the distance apart of the two points. If finer tolerances on parallelism than those stated are required they should be the subject of agreement between the manufacturer and the user. 6 Erection procedure The following principles should be adopted in erecting the machines: a) h
23、eight variations within the tolerances should be adjusted with shims or packing pieces on assembly; b) if several machines are to be coupled and the tolerance on shaft centre height is negative for each, the heights should be adjusted on assembly by means of shims or packing pieces, at least up to t
24、he nominal dimension; c) in all other cases, the machine with the greatest positive height deviation should be erected first and the other machines should have their shaft centre heights adjusted to suit by means of shims or packing pieces. Figure 1 Illustration of shaft centre heightsBS5186:1975 2
25、BSI 12-1999 Table 1 Shaft centre heights for driving and driven machines All dimensions are in millimetres. Series (See4.1) Series (See4.1) 1 2 3 4 1 2 3 4 25 40 63 100 160 25 32 40 50 63 80 100 125 160 200 25 28 32 36 40 45 50 56 63 71 80 90 100 112 125 140 160 180 200 225 a 25 26 28 30 32 34 36 38
26、 40 42 45 48 50 53 56 60 63 67 71 75 80 85 90 95 100 106 112 118 125 132 140 150 160 170 180 190 200 212 225 a 250 400 630 1000 1600 b 250 315 400 500 630 800 1000 1250 1600 b 250 280 315 355 400 450 500 560 630 710 800 900 1000 1120 1250 1400 1600 b 236 250 265 280 300 315 335 355 375 400 425 450 4
27、75 500 530 560 600 630 670 710 750 800 850 900 950 1000 1060 1120 1180 1250 1320 1400 1500 1600 b a Deviation from the series of preferred numbers which contains the number 224. b For heights above 1 600 mm, use preferred numbers.BS5186:1975 BSI 12-1999 3 Figure 2 Driving and driven machines showing
28、 relationship of insulating liners and shimsBS5186:1975 4 BSI 12-1999 Table 2 Tolerances on shaft height Table 3 Maximum parallelism error Nominal shaft centre height a Tolerance Electrical machines, driven machines, speed reducers, driving mechanisms for ships propeller shafts Driving machines othe
29、r than electric motors and driving mechanisms for ships propeller shafts From Up to and including mm mm mm mm 25 50 0 0.4 +0.4 0 50 250 0 0.5 +0.5 0 250 630 0 1.0 +1.0 0 630 1000 0 1.5 +1.5 0 1000 0 2.0 +2.0 0 NOTEIntermediate machines, e.g.speed changers, are to be regarded as driven machines. a Th
30、e stepping applies to machines with the feet at the base of the machine. In the case of machines where the feet are not at the lowest point, for example raised nearer to the centre line, the tolerance to be selected from the table is that which corresponds to the centre height of the frame, i.e.with
31、 the feet at the lowest point. Shaft centre height “h” a Maximum allowable parallelism error for shaft length “l” mm mm From to 2.5h l 2.5hu lu 4h l 4h 25 50 250 630 1000 50 250 630 1000 0.2 0.25 0.5 0.75 1.0 0.3 0.4 0.75 1.0 1.5 0.4 0.5 1.0 1.5 2.0 a The stepping applies to machines with the feet a
32、t the base of the machine. In the case of machines where the feet are not at the lowest point, for example raised nearer to the centre line, the tolerance to be selected from the table is that which corresponds to the centre height of the frame, i.e.with the feet at the lowest point.BS5186:1975 BSI
33、12-1999 Publications referred to This standard makes reference to the following British Standard: BS 2045, Preferred numbers. BS 5186:1975 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It prese
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