1、BRITISH STANDARDBS EN 3781:2008Aerospace series Grooves for spiral wound retaining rings Design standardICS 49.030.99g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42
2、g43g55g3g47g36g58BS EN 3781:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 62747 7National forewordThis British Standard is the UK implementation of EN 3781:2008.The UK participation in its preparatio
3、n was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible fo
4、r its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3781March 2008ICS 49.030.99English VersionAerospace series - Grooves for spiral woun
5、d retaining rings -Design standardSrie arospatiale - Gorges pour anneaux darrt spirals -Norme de conceptionLuft- und Raumfahrt - Nuten fr Spiralsicherungsringe -KonstruktionsnormThis European Standard was approved by CEN on 22 December 2007.CEN members are bound to comply with the CEN/CENELEC Intern
6、al Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.
7、This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are
8、the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerlan
9、d and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3781:2
10、008: E2 Contents Page Foreword3 Introduction .4 1 Scope 4 2 Normative references 5 3 Fitting and removal5 4 Clearance for installation and removal .5 5 Required characteristics.6 6 Designation 12 7 Indication on drawings12 BS EN 3781:20083 Foreword This document (EN 3781:2008) has been prepared by t
11、he Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AS
12、D, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. Attentio
13、n is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
14、 following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia
15、, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3781:20084 Introduction The retaining rings consist of two turns of flat spring steel strip formed in a continuous helix and are concentric with no projecting ears or lugs. There are two types of these rings, in-springing for use o
16、n external grooves (see Figure 1) and out-springing for use on internal grooves (see Figure 2). Figure 1 Figure 2 1 Scope This standard defines the groove dimensions for retaining rings. It is applicable for rings as per MA4016 for use on external grooves and rings as per MA4017 for use on internal
17、grooves. BS EN 3781:20085 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
18、MA4016:1987, Ring, retaining External, spiral wound, heavy and medium duty, cres, metric. 1) MA4017:1987, Ring, retaining Internal, spiral wound, heavy and medium duty, cres, metric. 1) 3 Fitting and removal 3.1 General These retaining rings may be fitted or removed without the use of circlip pliers
19、 or other special tools. 3.2 Fitting A ring is fitted into its appropriate groove by separating the coils, inserting one end of the ring into the groove and, keeping the coils separated, spiralling each turn of the ring into the groove. 3.3 Removal A ring may be removed by inserting a small screw-dr
20、iver, or similar tool, into the notch or slot provided at the coil ends and prising until that coil end is free of the groove, and then spiralling each coil out until the complete ring is free of the groove. 4 Clearance for installation and removal Since the radial walls of all retaining rings are u
21、niform, with no projecting ears or lugs, the total clearance required for installation or removal equals the radial wall of the ring, plus a radial clearance of at least 0,5 mm. Key 1 This free space (min. 0,5 mm) shall be adequate to permit easy installation and removal of the ring. 2 Radial width
22、of ring. Figure 3 1) Published by: Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096 - USA. BS EN 3781:20086 5 Required characteristics 5.1 External grooves for spiral wound retaining rings as per MA4016 Dimensions are in millimetres. See Figures 4 and 5 and Tables 1 and
23、2. Key 1 Sharp-edged Figure 4 Table 1 Basic shaft diameter A Groove runout tolerance E from to 0,05 18 28 0,15 29 55 0,20 56 80 0,25 82 150 0,30 155 280 Recommendation: Key 1 Max. chamfer or max. radius Maximum allowable chamfer or radius of retained part max. chamfer or max. radius = 0,375 (V M) V
24、= nom. radial width = 0,5 (V max. + V min.) M = nom. depth = 0,5 (A B) Figure 5 BS EN 3781:20087 Table 2 B C RDRing dimensions aV Diameter code Basic shaft diameter A max. max. min. Max. chamfer or max. radius a, bE018 18 16,92 E019 19 17,87 E020 20 18,77 E021 21 19,72 1,73 1,52 0,40 E022 22 20,62 E
25、023 23 21,57 E024 24 22,52 1,98 1,78 0,45 E025 25 23,42 0,13 E026 26 24,42 0,0701,24 0,04 2,24 2,03 0,50 E027 27 25,35 E028 28 26,30 E029 29 27,27 E030 30 28,25 E031 31 29,17 E032 32 30,10 2,69 2,49 0,65 E034 34 31,90 0,75 E035 35 32,80 E036 36 33,75 0,100E037 37 34,67 E038 38 35,65 1,45 0,05 3,07 2
26、,87 0,70 E040 40 37,55 E042 42 39,45 0,75 E045 45 42,25 E046 46 43,15 3,33 3,12 0,70 E047 47 44,31 1,00 E048 48 45,05 E050 50 47,05 1,80 0,05 4,09 3,89 0,95 E052 52 50,15 E053 53 51,15 E054 54 52,15 3,33 3,12 0,85 E055 55 53,15 E056 56 54,15 E058 58 56,01 E059 59 57,01 E060 60 58,01 0,95 E061 61 58,
27、91 3,58 3,38 0,90 E062 62 59,91 E063 63 60,91 E064 64 61,91 E065 65 62,81 E066 66 63,79 E067 67 64,71 3,84 3,63 1,00 E068 68 65,71 0,15 1,47 0,05 0,25 4,09 3,89 1,05 continued BS EN 3781:20088 Table 2 (concluded) B C RDRing dimensions a V Diameter code Basic shaft diameter A max. max. min. Max. cham
28、fer or max. radius a, bE069 69 66,71 E070 70 67,71 E071 71 68,71 4,09 3,89 1,05 E072 72 69,65 E075 75 72,61 1,47 0,05 E078 78 75,55 4,37 4,11 1,15 E080 80 77,51 1,25 E082 82 79,45 4,62 4,37 1,20 E085 85 82,35 E088 88 85,31 4,88 4,62 1,30 E090 90 87,21 E095 95 92,15 5,13 4,88 1,35 E100 100 97,01 5,38
29、 5,13 1,40 E105 105 101,85 5,64 5,38 1,50 E110 110 106,69 5,89 5,64 1,55 E115 115 111,55 1,80 0,06 6,15 5,89 1,60 E120 120 116,45 E125 125 121,45 E130 130 126,35 0,15E135 135 131,27 E140 140 136,25 1,70 E145 145 141,17 E150 150 146,17 0,17 2,07 0,06 6,45 6,20 1,65 E155 155 150,60 E160 160 155,60 E16
30、5 165 160,60 2,15 E170 170 165,40 E175 175 170,40 2,10 E180 180 175,20 E185 185 180,20 E190 190 185,20 E195 195 190,00 E200 200 195,00 8,037,722,05 E210 210 204,60 2,55 E220 220 214,40 E230 230 224,40 E240 240 234,20 2,50 E250 250 243,80 2,40 E260 260 253,60 E270 270 263,40 2,35 E280 280 273,20 0,20
31、 2,48 0,070,25 9,639,322,30 aDimensions do not form a part of designation. bRecommendation only, see Figure 5. BS EN 3781:20089 5.2 Internal grooves for spiral wound retaining rings as per MA4017 Dimensions are in millimetres. See Figures 6 and 7 and Tables 3 and 4. Key 1 Sharp-edged Figure 6 Table
32、3 Nominal bore diameter F Groove runout tolerance K from to 0,05 20 28 0,15 29 55 0,20 56 80 0,25 82 150 0,30 155 280 Recommendation: Key 1 Max. chamfer or max. radius Maximum allowable chamfer or radius of retained part max. chamfer or max. radius = 0,375 (W N) W = nom. radial width = 0,5 (W max. +
33、 W min.) N = nom. depth = 0,5 (G F) Figure 7 BS EN 3781:200810 Table 4 G H RJRing dimensions aW Diameter code Nominal bore diameter F max. max. min. Max. chamfer or max. radius a, bY020 20 21,23 Y021 21 22,28 1,04 0,04 Y022 22 23,38 1,98 1,78 0,45 Y023 23 24,43 Y024 24 25,48 0,55 Y025 25 26,68 0,13Y
34、026 26 27,78 1,24 0,042,24 2,03 0,50 Y027 27 28,88 Y028 28 29,88 00,07+0,65 Y029 29 30,95 Y030 30 32,00 Y031 31 33,05 Y032 32 34,00 2,692,490,60 Y034 34 36,20 Y035 35 37,30 Y036 36 38,40 Y037 37 39,40 0,70Y038 38 40,50 1,45 0,053,07 2,87 0,65 Y040 40 42,50 00,10+Y042 42 44,60 0,75 Y045 45 47,70 Y046
35、 46 48,80 3,333,120,70 Y047 47 49,90 Y048 48 51,00 0,95 Y050 50 53,20 0,10 1,80 0,054,09 3,89 Y052 52 53,80 Y053 53 54,80 0,123,33 3,12 0,90Y055 55 56,85 Y056 56 57,85 Y058 58 59,85 Y059 59 60,93 Y060 60 61,99 3,58 3,38 0,95 Y061 61 63,09 Y062 62 64,09 Y063 63 65,09 Y064 64 66,19 Y065 65 67,19 Y066
36、66 68,19 Y067 67 69,25 3,843,631,00 Y068 68 70,29 Y069 69 71,29 Y070 70 72,29 Y071 71 73,29 4,09 3,88 1,05 Y072 72 74,39 0,15 1,47 0,05 0,254,39 4,11 1,15 continued BS EN 3781:200811 Table 4 (concluded) G H RJRing dimensions a W Diameter code Nominal bore diameter F max. max. min. Max. chamfer or ma
37、x. radius a, b Y075 75 77,39 1,47 0,05Y078 78 80,45 4,39 4,11 1,15 Y080 80 82,49 1,25 Y082 82 84,55 4,62 4,37 1,20 Y085 85 87,65 Y088 88 90,69 4,88 4,62 1,30 Y090 90 92,79 Y092 92 94,85 Y095 95 97,85 5,134,881,35 Y098 98 100,99 Y100 100 102,99 5,38 5,13 1,40 Y102 102 105,15 Y105 105 108,15 5,64 5,38
38、 1,50 Y108 108 111,31 Y110 110 113,31 5,89 5,64 1,55 Y112 112 115,45 Y115 115 118,45 1,80 0,066,15 5,89 1,60 Y120 120 123,55 Y125 125 128,55 Y130 130 133,65 0,15 Y135 135 138,62 Y140 140 143,72 1,70 Y145 145 148,82 Y150 150 153,82 0,18 2,07 0,06 6,45 6,20 1,65 Y155 155 159,40 Y160 160 164,40 Y165 16
39、5 169,40 2,15 Y170 170 174,60 Y175 175 179,60 2,10 Y180 180 184,88 Y185 185 189,88 Y190 190 194,88 2,05 Y195 195 200,14 Y200 200 205,14 8,03 7,72 2,00 Y210 210 215,40 2,55 Y220 220 225,64 2,50 Y230 230 235,90 Y240 240 245,90 2,45 Y250 250 256,16 2,40 Y260 260 266,40 Y270 270 276,40 2,35 Y280 280 286
40、,66 0,20 2,48 0,07 0,259,639,322,30 aDimensions do not form a part of designation. bRecommendation only, see Figure 7. BS EN 3781:200812 6 Designation EXAMPLE Description block GROOVE Identity block EN3781E050 Number of this standard Diameter code (see Table 2 or Table 4) 7 Indication on drawings EX
41、AMPLE Key 1 Groove EN3781E050 Figure 8 Alternatively the groove may be fully dimensioned on the drawing. BS EN 3781:2008blankBS EN 3781:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It prese
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