1、BRITISH STANDARD BS2519-2: 1976 ISO701:1976 Glossary for Gears Part2: Notation ISO title: International gear notation Symbols for geometrical data UDC003.62:621.833:531.7BS2519-2:1976 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, wa
2、s published underthe authority of the Executive Board on 30November1976 BSI09-1999 First published as BS2519 November1954 First revision as Part2 November1976 The following BSI references relate to the work on this standard: Committee reference MEE/17 Draft for approval75/76099 ISBN0 580 09069 8 Coo
3、perating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial organizations: Associated Offices Technical Committee Engi
4、neering Equipment Users Association* Association of Consulting Engineers* Federation of Manufacturers of Construction Association of Hydraulic Equipment Equipment and Cranes Manufacturers Ltd. Health and Safety Executive, HM Factory Association of Mining Electrical and Inspectorate Mechanical Engine
5、ers Institution of Gas Engineers British Compressed Air Society Institution of Heating and Ventilating British Electrical and Allied Manufacturers Engineers Association Institution of Mechanical Engineers* British Gas Corporation Institution of Plant Engineers British Gear Manufacturers Association*
6、 Institution of Production Engineers* British Internal Combustion Engine London Transport Executive Manufacturers Association Machine Tool Trades Association* British Mechanical Engineering Confederation Ministry of Defence* British Pump Manufacturers Association National Coal Board* British Steel C
7、orporation Process Plant Association British Steel Industry Railway Industry Association of Great Britain Crown Agents for Oversea Governments and Royal Institute of British Architects Administrations Society of Motor Manufacturers and Traders Department of the Environment Ltd.* Department of Indust
8、ry Telecommunication Engineering and Department of Industry National Manufacturing Association Engineering Laboratory* Water Tube Boilermakers Association Department of Trade Electricity Supply Industry in England and Wales The Government department and scientific and industrial organizations marked
9、 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: British Horological Institute North East Coast Institution of Engineers and British Railways Board Shipbuilders Electronic Engineering
10、 Association Precision Gear Association (BEAMA) Institute of British Foundrymen Individual experts Milling Cutter and Reamer Association Navy and Vickers Gearing Research Association Amendments issued since publication Amd. No. Date of issue CommentsBS2519-2:1976 BSI 09-1999 i Contents Page Cooperat
11、ing organizations Inside front cover Foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Principal symbols and additional suffixes or signs 2 Annex Recapitulative index of letters and signs used in thisInternationalStandard 4 Table 1 Principal symbols 2 Table 2 Additional suffixes or s
12、igns 3 Table 3 Basic italic letters 4 Table 4 Suffixes and signs 5BS2519-2:1976 ii BSI 09-1999 Foreword This Part of this British Standard has been prepared under the authority of the Mechanical Engineering Standards Committee. It is identical with ISO701 “International gear notation Symbols for geo
13、metrical data” and is complementary to the British Standards for gears and allied subjects. For the purposes of this British Standard the text of ISO701 should be modified as follows. Terminology. The words “British Standard” should replace “InternationalStandard” wherever they appear. A British Sta
14、ndard 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 confer immunity from legal obligations. Summary of pages This document comprises a front cover
15、, an inside front cover, pagesi andii, pages1 to5 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.BS2519-2:1976 BSI 09-1999 1 0 Introduction This International Stan
16、dard aims to unify the symbols used in different countries for the international notation of gears with regard to the principal geometrical data defined in ISO/R1122, Glossary of gears Geometrical definitions. These symbols have been chosen after detailed comparative study, taking into account the n
17、ecessity of retaining a certain number of letters for standardization of other notations at a later date, such as those dealing with gear accuracy. Consequently it is important to bring national standards into line with this International Standard, so that in future a real international language of
18、notations will facilitate the exchange of documents between one country and another; to use for geometrical data only combinations of letters or signs appearing in the alphabetical annex, in order to avoid any risk of confusion with notations to be determined later with regard to other gear data. 1
19、Scope and field of application This International Standard specifies symbols for geometrical data for use in gear notation. It consists essentially of two parts: on the one hand, the principal symbol, composed either of a single basic letter, or of a basic letter and suffix or sign which are general
20、ly inseparable for the given term (seeTable 1); on the other hand, additional suffixes or signs which may be added if necessary to the principal symbols, in order to imply a particular qualification of the given term (seeTable 2). The Annex gives lists classified in alphabetical order according to t
21、he Roman and Greek alphabets, on the one hand of the basic letter symbols, and on the other hand of the suffixes and signs which have been used in the establishment of this International Standard and a combination of which may possibly be used for the notation of any other term of geometrical data n
22、ot explicitly mentioned in this International Standard.BS2519-2:1976 2 BSI 09-1999 2 Principal symbols and additional suffixes or signs Table 1 Principal symbols a No. Term Symbol No. Term Symbol 1 2 3 4 5 6 7 8 9 10 11 12 13 14 b 15 16 17 18 b 19 20 21 22 23 24 c 25 c 26 27 28 29 30 Centre distance
23、 Shaft angle Linear speed Angular speed Number of revolutions Gear ratio Transmission ratio Number of teeth Facewidth Cone distance Radius Diameter Reference diameter Pitch diameter Tip diameter Root diameter Reference cone angle Pitch angle Tip angle Root angle Tooth depth Addendum Dedendum Addendu
24、m angle Dedendum angle Helix angle Lead angle Lead Involute (=tg ) Profile radius a v n u i z b R r d d d d a d f a f h h a h f a f p 2 inv 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 Pressure angle Pitch Module Diametral pitch Angular pitch of crown gear T
25、ooth thickness Spacewidth Tooth thickness half-angle Spacewidth half-angle Chord Chordal height Constant chord Constant chord height Base tangent length (e.g.:W 3for3 teeth) Bottom clearance Circumferential backlash Normal backlash Addendum modification coefficient Centre distance modification coeff
26、icient Length of approach path Length of recess path Length of path of contact Overlap length Transverse angle of transmission Overlap angle Total angle of transmission Transverse contact ratio Overlap ratio Contact ratio p m P s e W c j 1 j n x y g f g a g g a To be completed if necessary by additi
27、onal suffixes or signs from Table 2. b The apostrophe may, if desired, be replaced by the suffix w. c Lower-case theta may be written or . s h a s c h cBS2519-2:1976 BSI 09-1999 3 Table 2 Additional suffixes or signs No. Term Suffix or sign Suffixes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
28、 21 22 23 Tip Root Transverse Normal Axial Radial Tangential Mean Base On any cone or cylinder On back cone (or virtual cylindrical gear) External Internal Right hand; right Left hand; left Of approach Of recess Of transverse contact Overlap Total of contact Relating to the tool Relating to the pini
29、on Relating to the wheel a f t n x r t m b y v e i R L f a 0 1 2 Other signs 24 25 a 26 Reference Working Coefficient (of a dimension other than addendum or centre distance modification) (no sign) (apostrophe) * (asterisk) a The apostrophe may, if desired, be replaced by the suffix w.BS2519-2:1976 4
30、 BSI 09-1999 Annex Recapitulative index of letters and signs used in this InternationalStandard Table 3 Basic italic letters ROMAN ALPHABET GREEK ALPHABET Symbol Term Symbol Term Lower-case Lower-case a b c d e g h i j m n p Centre distance Facewidth Bottom clearance Diameter Spacewidth Length (of p
31、ath of contact, overlap, etc.) Tooth depth either addendum or dedendum Transmission ratio Backlash Module Number of revolutions Pitch Pressure angle Helix angle Lead angle Cone angle Ratio (contact, overlap, etc.) Spacewidth half-angle Angle (addendum or dedendum) a Profile radius Angular pitch of c
32、rown gear Angle (transmission, overlap, etc.) Tooth thickness half-angle Angular speed r Radius Capital s Tooth thickness Shaft angle a Lower-case theta may be written or . u v x y z inv Gear ratio Linear speed Addendum modification coefficient Centre distance modification coefficient Number of teet
33、h Involute Capitals P R W Diametral pitch Cone distance Base tangent lengthBS2519-2:1976 BSI 09-1999 5 Table 4 Suffixes and signs ROMAN ALPHABET GREEK ALPHABET Suffix or sign Term Suffix or sign Term Lower-case Lower-case a b c Tip; of recess Base Relating to constant chord Of transverse contact Ove
34、rlap Total of contact e External FIGURES f i m Root; of approach Internal Mean 0 1 2 Relating to the tool Relating to the pinion Relating to the wheel n Normal VARIOUS SIGNS r t v (w) Radial Transverse; tangential On back cone (or virtual cylindrical gear) Working a * (asterisk) (apostrophe) Coeffic
35、ient (of a dimension other than addendum or centre distance modification) Relating to the chord (e.g.) Working x Axial NEITHER SUFFIX NOR SIGN y On any cone or cylinder (no sign) Reference z Of a helix ( z =lead) Capitals L R Left hand, left Right hand, right a This suffix may, if desired, replace t
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