1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 249:1993 ISO 7649:1991 Specification for Clutch housings for reciprocating internal combustion engines Nominal dimensions and tolerances UDC 629.114.4/.5:621.838.2BSAU249:1993 This British Standard, having been prepared under the directionof the Automobile St
2、andards Policy Committee, waspublished under the authorityof the Standards Boardand comes intoeffecton 15July1993 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference AUE/13 Draft for comment 89/80163 DC ISBN 0 580 22404 X Committees responsible for this
3、British Standard The preparation of this British Standard was entrusted by the Automobile Standards Policy Committee (AUE/-) to Technical Committee AUE/13 upon which the following bodies were represented: British Railways Board Bus and Coach Council Department of Health Department of Transport Depar
4、tment of Transport (Transport Research Laboratory) Freight Transport Association Health and Safety Executive Institute of Road Transport Engineers Lloyds Register of Shipping Ministry of Defence Road Haulage Association Ltd. Society of Motor Manufacturers and Traders Ltd. Coopted members Amendments
5、issued since publication Amd. No. Date CommentsBSAU249:1993 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Nominal dimensions tolerances and spacing of clearance holes 1 Figure 1 Clutch housing 2 Figure 2 Bolt/screw spa
6、cing 3 Table 1 Clutch housing nominal dimensions and tolerances 4 Table 2 Bearing location diameters and associated splines 4 List of references Inside back coverBSAU249:1993 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Automobile Standards Poli
7、cy Committee. It is identical with ISO7649:1991 Clutch housings for reciprocating internal combustion engines Nominal dimensions and tolerances, published by the International Organization for Standardization (ISO) and in the development of which the United Kingdom played an active part. The Technic
8、al Committee has reviewed the provisions of ISO1101:1983 and SAEJ499a, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. User
9、s of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International Standard Corresponding British Standard ISO 286-2:1988 BS 4500 ISO limits and fits Section 1.2:1990 Tables
10、 of commonly used tolerance grades and limit deviations for holes and shafts (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may hav
11、e had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSAU249:1993 BSI 10-1999 1 1 Scope This International Standard specifies the nominal dimensions and tolerances which affect the interchangeability between clutch housings for spring-loaded clutches
12、 and mating parts for reciprocating internal combustion engines. All other dimensions and tolerances are left to the discretion of the component manufacturer. This International Standard applies to reciprocating internal combustion engines, with the exception of engines for aircraft and passenger ca
13、rs; it may be used for other engine applications where no specific International Standard exists. Clutch housings of size codes1 to4 inTable 1 are recommended for commercial vehicles and buses. 2 Normative references The following standards contain provisions which, through reference in this text, c
14、onstitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions
15、 of the standards indicated below. Members of IECandISO maintain registers of currently valid International Standards. ISO 286-2:1988, ISO system of limits and fits Part2: Tables of standard tolerance grades and limit deviations for holes and shafts. ISO 1101:1983, Technical drawings Geometrical tol
16、erancing Tolerancing of form, orientation, location and run-out Generalities, definitions, symbols, indications on drawings. SAE J499a, Parallel side splines for soft broached holes in fittings. 3 Nominal dimensions, tolerances and spacing of clearance holes 3.1 Nominal dimensions and tolerances for
17、 the preferred sizes of clutch housings which affect interchangeability shall be as shown inTable 1 andFigure 1 andFigure 2. The flywheel housing which mates with the clutch housing shown inFigure 1 should be in accordance with ISO7648, Flywheel housings for reciprocating internal combustion engines
18、 Nominal dimensions and tolerances. 3.2 The sizes of bearing location diameters, K, and splines shall be selected fromTable 2. 3.3 For spacing of clearance holes, seeTable 1 andFigure 2. For definitions and symbols for geometrical tolerances, see ISO1101. For size code1, in the case where24 clearanc
19、e holes are required, intermediate hole positions shall be used.BSAU249:1993 2 BSI 10-1999 Figure 1 Clutch housingBSAU249:1993 BSI 10-1999 3 Figure 2 Bolt/screw spacingBSAU249:1993 4 BSI 10-1999 Table 1 Clutch housing nominal dimensions and tolerances Table 2 Bearing location diameters and associate
20、d splines Dimensions in millimetres Size code A B C F Optional F dimension for: G H L No. of clearance holes double plate clutch when extra-heavy flywheel is used clutch shaft bearing located in pilot bore of flywheel or crank-shaft end tol. a H13 a 00 787,4 g8 883 850,9 104 80 6 13,5 16 0 647,7 g8
21、711 679,45 104 80 6 13,5 16 1/2 584,2 g8 648 619,12 104 80 6 13,5 12 1 511,18 g7 553 530,22 104 137 116 80 6 11 b 12 c 2 447,68 g7 489 466,72 104 116 80 6 11 12 3 409,58 g7 451 428,62 104 80 6 11 12 4 361,95 g7 404 381 104 80 6 11 12 5 314,32 g7 356 333,38 75 58 6 11 8 6 266,7 g7 308 285,75 75 58 6
22、11 8 a See ISO 286-2. b 13,5 mm diameter may be used for high engine torque applications. c 24 clearance holes are optional for attachment to aluminium flywheel housing of size code 1. Spline profile a K J ref. mm in 20 1 3/8 SAE 10C b 25 1 1/2 25 1 3/4 25 or 30 c 2 a The use of involute splines is
23、also permitted if agreed between manufacturer and user. b This is the shape type and size specified in SAE J499a. c If a 30 mm diameter bearing bore is used, dimension G = 80 mm, Table 1, is reduced to 78 mm.BSAU249:1993 BSI 10-1999 List of references See national foreword.BS AU 249:1993 ISO 7649:19
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