BS-AU-264-1995 ISO-2345-1994.pdf
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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 264:1995 ISO 2345:1994 Road vehicles M18 1,5 spark-plugs with conical seating and their cylinder head housing ICS 43.060.50 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:43 GMT+00:00 2006, Uncontrolled Copy, (c) B
2、SI BS AU 264:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1995 BSI 11-1999 The following BSI references relate to the work on this standard: Committe
3、e reference MCE/9 Draft for comment 93/715401 DC ISBN 0 580 24944 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee MCE/9, Ignition equipment for spark ignition engines, upon which the following bodies were represented: S
4、ociety of Motor Manufacturers and Traders Ltd. Coopted members Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 264:1995 BSI 11-1999i Contents Page
5、Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Requirements1 Figure 1 M18 1,5 spark-plugs with conical seating3 Figure 2 Housing of spark-plug in cylinder head4 Table 11 List of referencesInside back cover Licensed Copy: London South Bank University, Lon
6、don South Bank University, Sat Dec 09 02:08:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 264:1995 ii BSI 11-1999 National foreword This British Standard has been prepared by Technical Committee MCE/9. It is identical with ISO 2345:1994 Road vehicles M18 1,5 spark-plugs with conical seating an
7、d their cylinder head housing, published by the International Organization for Standardization (ISO). A British Standard 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 Standar
8、d does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard ISO 68:1973 ISO 261:1973 ISO 965-1:1980 ISO 965-3:1980 BS 3643 ISO metric screw threads Part 1:1981 Principles and basic data (Technically equivalent) Summary of pages
9、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 have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Li
10、censed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:08:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 264:1995 BSI 11-19991 1 Scope This International Standard specifies the main characteristics of M18 1,5 spark-plugs with conical seating and their cylinder he
11、ad housing, for use with spark-ignition engines. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
12、revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 68:1973, ISO general
13、 purpose screw threads Basic profile. ISO 261:1973, ISO general purpose metric screw threads General plan. ISO 965-1:1980, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data. ISO 965-3:1980, ISO general purpose metric screw threads Tolerances Part 3: Deviations for
14、 constructional threads. 3 Requirements 3.1 Terminals The spark-plug terminal may be either the solid post or the threaded type. A spark-plug with threaded terminal on which a nut is applied shall respect the dimensions specified for spark-plugs with solid post terminal. See Figure 1. 3.2 Dimensions
15、 and threads See Figure 1 and Figure 2. 3.2.1 Length dimensions The length dimensions are measured from a gauging plane defined by diameter 19 mm on the seating. Dimension 10,9 mm 0,3 mm may be increased for certain spark-plug types. 3.2.2 Dimensions of spark-plug housing in cylinder head The length
16、 dimensions Z and 9 mm max. in the cylinder head are measured from a gauging plane defined by diameter 19 mm on the seating. The Z length of the spark-plug housing in the cylinder head shall be sufficient to ensure that the end of the spark-plug thread does not project into the combustion chamber at
17、 any point when the spark-plug is tightened to the maximum torque specified in 3.4. 3.2.3 Threads 3.2.3.1 Spark-plug and cylinder head The threads of M18 1,5 spark-plugs and the corresponding tapped holes in the cylinder head shall conform to ISO 68, ISO 261, ISO 965-1 and ISO 965-3. Their limiting
18、dimensions and their tolerance classes shall be as specified in 3.2.3.1.1 and 3.2.3.1.2 respectively. 3.2.3.1.1 Limiting dimensions The limiting dimensions shall be as given in Table 1. Table 1 3.2.3.1.2 Tolerance classes The tolerance classes of thread M18 1,5 of finished spark-plugs and of the cor
19、responding tapped holes in the cylinder head shall be as follows: 6e for spark-plugs (see note 1); 6H for tapped holes in the cylinder head. NOTE 1In order that spark-plugs complying with this International Standard can be fitted in existing heads also in extreme cases, the value for the maximum tru
20、ncation of the minor diameter of the spark-plug base has been slightly reduced with respect to the ISO value. This maximum value of the minor diameter is calculated from a distance of H/6 for the maximum truncation instead of the value given by the formula in ISO 965-1:1980, clause 11, according to
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