1、BRITISH STANDARD BS4185-11: 1983 Machine tool components Part 11: Recommendations for accuracy grades of gears UDC 621.9:621.833.1-187BS4185-11:1983 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe authority of t
2、he BoardofBSI and comes into effecton 31March1983 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for comment82/72788 DC ISBN 0 580 13253 6 Cooperating organizations The Mechanical Engineering Standards Committee, under whose direction th
3、is British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee Department of Trade (Marine Division) Association of Consulting Engineers Department of Transport Association of Hydraulic Equipment Electricity Supply Industry in England and Man
4、ufacturers Wales Association of Mining Electrical and Energy Industries Council Mechanical Engineers Engineering Equipment Users Association British Compressed Air Society Federation of Manufacturers of Construction British Constructional Steelworks Association Equipment and Cranes British Electrica
5、l and Allied Manufacturers Health and Safety Executive Association (BEAMA) Institution of Gas Engineers British Gas Corporation Institution of Mechanical Engineers* British Gear Manufacturers Association Institution of Plant Engineers British Internal Combustion Engine Institution of Production Engi
6、neers* Manufacturers Association Lloyds Register of Shipping British Pump Manufacturers Association London Transport Executive British Steel Corporation Machine Tool Industry Research Association* British Steel Industry Ministry of Defence* British Valve Manufacturers Association National Coal Board
7、 Chartered Institution of Building Services Oil Companies Materials Association Crown Agents for Oversea Governments and Process Plant Association Administrations Railway Industry Association of Great Britain Department of Industry (Mechanical Society of Motor Manufacturers and Traders Engineering)*
8、 Limited Department of Industry (National Engineering Telecommunication Engineering and Laboratory) Manufacturing Association (TEMA) Department of the Environment (PSA)* Water-tube Boilermakers Association The organizations marked with an asterisk in the above list, together with the following, were
9、 directly represented on the Technical Committee entrusted with the preparation of this British Standard: Ball and Roller Bearing Manufacturers University of Aston in Birmingham Association University of Manchester Institute of Science Federation of British Engineers Tool and Technology Manufacturer
10、s Amendments issued since publication Amd. No. Date of issue CommentsBS4185-11:1983 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Grades of accuracy of gears 1 4 General 1 Table 1 Recommended grades of accuracy for straight spur and
11、single helical gears for machine tools 1 Publications referred to Inside back coverBS4185-11:1983 ii BSI 08-1999 Foreword This British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee and is based on a draft prepared by the Machine Tool Industry Resear
12、ch Association. The standard provides detailed guidance for designers when choosing appropriate grades of accuracy, selected from BS436-2, of gears for application to the various gearing and transmission requirements of machine tools. Recommended grades also comply with ISO1328:1975, published by th
13、e International Organization for Standardization (ISO). The recommendations are based upon those for straight spur and single helical gears contained in the “Manual for machine tool gearing” 1)published by the American Gear Manufacturers Association. In deciding upon the accuracy required in a set o
14、f gears, it should be kept in mind that the greater the accuracy, the higher the cost. The optimum is, therefore, the lowest degree of accuracy which will fulfil the requirements of the application. In general, the higher the speed at which a pair of gears has to run, the higher the required accurac
15、y, so that noise and dynamic loading will not be excessive. There are, however, applications where a precise control of motion is required so that the gears require a high degree of accuracy regardless of the speed at which they operate. A British Standard does not purport to include all the necessa
16、ry 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, pagesi andii, pages1 and
17、 2, 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. 1) Available from the American Gear Manufacturers Association,1901 North Fort Myer Drive,
18、Arlington, Virginia,22209.BS4185-11:1983 BSI 08-1999 1 1 Scope This British Standard gives recommended grades of accuracy, selected from BS436-2, for straight spur and single helical gears used in machine tools. NOTEThe titles of the publications referred to in this standard are listed on the inside
19、 back cover. 2 Definitions For the purposes of this British Standard, the definitions given in BS2519-1 apply. 3 Grades of accuracy of gears Recommended grades are given in Table 1. 4 General 4.1 The accuracy of mounting the gear in service should be compatible with the grade of gear specified. For
20、example, radial and axial run-out should not be worsened by more than one grade by the effect of mounting. NOTE 1Where possible, the grade(s) selected for gears in power trains should be verified during development by frequency analysis of noise. This should identify noisy gears which need to be up-
21、rated and, equally significant, quiet gears whose quality could perhaps be relaxed. NOTE 2Gearboxes which are independent of the main structure of the machine tool, with the obvious exception of a final drive such as a belt or a flexible coupling, can be treated externally to control noise and thus
22、lower grades of gear may be tolerated. 4.2 Power trains of grade6 and better should be given tip relief corresponding to the combined effect of tooth deflection under load and cumulative error. In the case of coarser grades, tip relief should correspond to cumulative error (which will normally be fa
23、r greater than tooth deflection under load). 4.3 For power train gears of grade6 and better, shaft diameter, rim thickness and bearing spacing should be based on detailed analysis or practical tests to confirm the design. 4.4 Grades1 to3 are usually reserved for master gears. 4.5 References in techn
24、ical literature should refer to the grade designation used in this standard. Where applicable, the relationship with other accuracy designations, such as a manufacturers own, used should be explained. Table 1 Recommended grades of accuracy for straight spur and single helical gears for machine tools
25、 Application Pitch line velocity of gear Grade of gear taken from BS436-2 Spur gear power drives m/s 0 to4 4 to10 10 to20 over20 8 to10 6 to8 4 to6 4 Single helical gear power drives 0 to4 4 to10 10 to20 over20 9 to11 7 to9 5 to7 5 Spindle drive gears Spur gears Single helical gears 6 7 Feed drives
26、(seenote1) (Drives of machine structures holding workpieces or tools) 7 Hand motion to machine structures 8 to10 High precision indexing (seenote2) 3 Hand indexing of medium accuracy 6 Non-driving gears used for trips, etc. 10 Rack driving gears (Feed drives and accurate indexing, etc. are excluded.
27、) 10 Change gears (seenote3) 6 to8 NOTE 1In the case of anti-backlash trains, particularly pre-set backlash elimination, an accuracy grade better than7 may be needed. NOTE 2Grades1 and2 may be necessary, but only after detailed analysis of the overall system accuracy. NOTE 3If the gear is part of a
28、power drive, the grade is determined by the appropriate category listed above.2 blankBS4185-11:1983 BSI 08-1999 Publications referred to BS436, Spur and helical gears. BS436-2, Basic rack form, modules and accuracy(1 to50 metric module). BS2519, Glossary for gears. BS2519-1, Geometrical definitions.
29、 ISO1328, Parallel involute gears ISO system of accuracy 2) . Manual for machine tool gearing 3) . 2) Referred to in the foreword only. 3) Published by the American Gear Manufacturers Association.BS4185-11: 1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indep
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