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1、BRITISH STANDARD BS ISO 22977:2005 Road vehicles M12 1,25 spark-plugs with flat seating and 14 mm bi-hexagon and their cylinder head housing ICS 43.060.50 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 22977:2005 This British Stand
2、ard was published under the authority of the Standards Policy and Strategy Committee on 16 January 2006 BSI 16 January 2006 ISBN 0 580 46874 7 National foreword This British Standard reproduces verbatim ISO 22977:2005 and implements it as the UK national standard. The UK participation in its prepara
3、tion was entrusted to Technical Committee MCE/9, Ignition equipment for spark ignition engines, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international pub
4、lications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the n
5、ecessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the i
6、nterpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to
7、 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number
8、ISO 22977:2005(E) INTERNATIONAL STANDARD ISO 22977 First edition 2005-07-15 Road vehicles M12 x 1,25 spark-plugs with flat seating and 14 mm bi-hexagon and their cylinder head housing Vhicules routiers Bougies dallumage M12 x 1,25 sige plat et bi- hexagonal de 14 mm et leur logement dans la culasse
9、BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Foreword ISO (the International Organization for Standardizat
10、ion) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be r
11、epresented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Interna- tional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standar
12、ds are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Intern
13、a- tional Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22977
14、was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 1, Ignition equipment. BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+
15、00:00 2006, Uncontrolled Copy, (c) BSI 1 Road vehicles M12 x 1,25 spark-plugs with flat seating and 14 mm bi-hexagon and their cylinder head housing 1 Scope This International Standard specifies characteristics of M12 1,25 spark-plugs with flat seating and 14 mm bi-hexagon and of their cylinder head
16、 housings, for use with spark-ignition engines. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer- ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
17、ny amendments) applies. ISO 68-1, ISO general purpose screw threads Basic profile Part 1: Metric screw threads ISO 261, ISO general purpose metric screw threads General plan ISO 965-1, ISO general-purpose metric screw threads Tolerances Part 1: Principles and basic data ISO 965-3, ISO general purpos
18、e metric screw threads Tolerances Part 3: Deviations for constructional screw threads ISO 4095, Aerospace Bihexagonal drives Wrenching configuration Metric series ISO 14508, Road vehicles Spark-plugs Terminals 3 Terminals The spark-plug terminal may be either the solid post or the threaded type as d
19、escribed in ISO 14508. A spark- plug with threaded terminal on which a nut is applied shall respect the dimensions specified for spark-plugs with solid post terminals (see Figures 1 and 2). 4 Dimensions and threads 4.1 Spark-plug reach The spark-plug reach shall be according to Table 1 (see Figures
20、1 to 4). BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 Table 1 Spark plug reach Dimensions in millimetres A Ea Type of reach Tolerance of A+E 0,2 B max. Y + 0,3 0,8 Normal 12,7 21 11,7 Long 0 27 Extended long 19 1,5 6 3
21、1 18 Extra long 0 34,5 Extended extra long 26,5 1,5 6 38,5 25,5 a It is intended to specify E more definitively in future revisions of this International Standard. 4.2 Gasket When the spark-plugs have been tightened with a torque of 25 Nm, on threads that are clean, smooth and dry, the gaskets shall
22、 be 1 mm to 1,6 mm thick. If the gasket thicknesses are different, a corresponding adjustment to dimensions A, B and Y shall be made. Non-captive gaskets may be used in special cases. 4.3 Threads for spark-plugs and cylinder heads 4.3.1 General The threads of M12 1,25 spark-plugs and the correspondi
23、ng tapped holes in the cylinder head shall conform to ISO 68-1, ISO 261, ISO 965-1 and ISO 965-3. Their limiting dimensions and their tolerance classes are specified in 4.3.2 and 4.3.3, respectively. 4.3.2 Limiting dimensions The limiting dimensions are given in Table 2. Table 2 Limiting dimensions
24、Dimensions in millimetres Dimension Plug thread (on finished plug) Tapped hole in cylinder head max. 11,937 Not specified Major diameter min. 11,725 12,000 max. 11,125 11,368 Pitch diameter min. 10,993 11,188 max. 10,404 10,912 Minor diameter min. 10,181a 10,647 a With a root radius W 0,125 mm (0,1
25、P). BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 4.3.3 Tolerance classes The thread tolerance classes of finished M12 1,25 spark-plugs and of the corresponding tapped holes in the cylinder head are as follows: 6e for s
26、park-plugs (see Note 1); 6H for tapped holes in the cylinder head. NOTE 1 In order that spark-plugs complying with this International Standard can be fitted in existing cylinder heads also in extreme cases, the value for the maximum truncation of the minor diameter of the spark-plug base has been sl
27、ightly reduced with respect to the ISO value. This maximum value of the minor diameter is calculated from a distance of H16 for the maximum truncation instead of the value given by the formula in ISO 965-1:1980, Clause 11, according to the formula given below: Minor diameter, maximum = d1 es 2(H/4 H
28、/6) = (10,647 0,063 0,180) mm = (10,647 0,243 = 10,404) mm The value for the basic profile remains the same as for the ISO thread (10,647 0,063 = 10,584) mm. NOTE 2 The initial clearance e = 0,063 mm between the pitch diameters of the thread and of the tapped hole is intended to prevent the possibil
29、ity of seizure, as a result of combustion deposits on the bare threads, when removing the spark-plugs. This clearance is also intended to enable spark-plugs with threads in accordance with this International Standard to be fitted in existing tapped holes. 5 Other dimensions of spark-plugs and their
30、cylinder head housings The other dimensions shall be as indicated in Figures 1 to 5. Dimensions 52,5 mm on spark-plugs with solid post terminal and 49,5 mm on spark-plugs with threaded terminal shall be measured when the spark-plugs have been tightened according to 4.2. The non-ribbed insulator desi
31、gn is preferred because it provides superior protection to flashover between the spark-plug insulator and the cover. 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 any poi
32、nt when the gasket is tightened to maximum compression. Details not specified are left to the manufacturers choice. BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 Dimensions in millimetres Key 1 solid post terminal ISO 1
33、4508 2 captive gasket 3 pitch diameter 4 bi-hexagon according to ISO 4095 a Dimension after spark-plug has been tightened with a torque of 25 Nm. b Optional. c Dimension “B“ is the maximum protrusion of any part of the spark-plug into the combustion chamber. Figure 1 Spark-plug with solid post termi
34、nal (preferred design with non-ribbed insulator) Dimensions in millimetres Key a The number and shape of ribs are optional. Figure 2 Spark-plug with solid post terminal (traditional design with ribbed insulator) BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00
35、:00 2006, Uncontrolled Copy, (c) BSI 5 Dimensions in millimetres Key 1 threaded terminal ISO 14508 2 captive gasket 3 pitch diameter 4 bi-hexagon according to ISO 4095 a Dimension after spark-plug has been tightened with a torque of 25 Nm. b Optional. c Dimension “B“ is the maximum protrusion of any
36、 part of the spark-plug into the combustion chamber. Figure 3 Spark-plug with threaded terminal (preferred design with non-ribbed insulator) Dimensions in millimetres Key a The number and shape of ribs are optional. Figure 4 Spark-plug with threaded terminal (traditional design with ribbed insulator
37、) BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 Dimensions in millimetres Key a 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 pr
38、oject into the combustion chamber at any point when the gasket is tightened to maximum compression. Figure 5 Cylinder head housing 6 Installation tightening torque The installation torque values apply to new spark-plugs without lubricant on the threads. If threads are lubri- cated, the torque value
39、shall be reduced by approximately one-third to avoid overstressing. Spark-plugs shall be tightened with a torque of 15 Nm to 25 Nm. NOTE Engine manufacturers may specify a different torque for the first spark-plug installation. BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26
40、 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 7 Bibliography 1 ISO 11565, Road vehicles Spark-plugs Test methods and requirements BS ISO 22977:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 14:17:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 22977:2005 BSI 389 Chiswick Hig
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