1、BSI Standards Publication BS ISO 6623:2013 Internal combustion engines Piston rings Scraper rings made of cast ironBS ISO 6623:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6623:2013. It supersedes BS ISO 6623:2004 which is withdrawn. The UK participat
2、ion in its preparation was entrusted to Technical Committee MCE/14/-/10, RIC engines - Cylinders, pistons and rings. 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 contr
3、act. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 72527 2 ICS 43.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the
4、 authority of the Standards Policy and Strategy Committee on 31 July 2013. Amendments issued since publication Date Text affectedBS ISO 6623:2013 ISO 2013 Internal combustion engines Piston rings Scraper rings made of cast iron Moteurs combustion interne Segments de piston Segments racleurs mixtes e
5、n fonte moule INTERNATIONAL STANDARD ISO 6623 Third edition 2013-07-15 Reference number ISO 6623:2013(E)BS ISO 6623:2013ISO 6623:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
6、 or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO
7、 copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 6623:2013ISO 6623:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative referenc
8、es 1 3 Overview . 1 4 Ring types and designation examples 1 4.1 Types N, NM, E, and EM scraper rings General features 1 4.2 Type N . 2 4.3 Type NM 3 4.4 Type E . 4 4.5 Type EM 5 5 Common features . 6 5.1 Type N, NM, E, and EM rings Inside chamfered edges (KI) . 6 5.2 Type NM and EM rings with a part
9、ly cylindrical machined (LM) or lapped (LP) peripheral surface at the bottom running edge 7 5.3 Type N, NM, E, and EM rings (chromium plated/spray coated) . 7 5.4 Napier or scraper ring with reduced undercut or step (mini Napier/stepped) RU 8 6 Force factors 8 7 Dimensions 10 Bibliography .26BS ISO
10、6623:2013ISO 6623:2013(E) Foreword ISO (the International Organization for Standardization) 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
11、in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commi
12、ssion (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents s
13、hould be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives 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 ident
14、ifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patents Any trade name used in this document is information given for the convenience o
15、f users and does not constitute an endorsement. The committee responsible for this document is ISO/TC 22, Road vehicles. This third edition cancels and replaces the second edition (ISO 6623:2004), of which it constitutes a minor revision.iv ISO 2013 All rights reservedBS ISO 6623:2013ISO 6623:2013(E
16、) Introduction ISO 6623 is one of a number of series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6621, 2 3 4 5ISO 6622, 6 7ISO 6624, 8 9 10 11ISO 6625, 12ISO 6626, 13 14 15and ISO 6627 16(see Bibliography for details). ISO 2013 A
17、ll rights reserved vBS ISO 6623:2013BS ISO 6623:2013Internal combustion engines Piston rings Scraper rings made of cast iron 1 Scope This International Standard specifies the essential dimensional features of scraper rings made of cast iron, types N, NM, E, and EM, having diameters from 30 mm up to
18、and including 200 mm, used in reciprocating internal combustion engines for road vehicles and other applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the
19、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications 3 Overview The scraper ring types are specified in Tables 1 and 2 and Figures 1 to 5.
20、Their common features and the dimensions of those features are specified in Tables 3 to 5 and Figures 6 to 9. Tables 6 and 7 give the force factors for the different ring types, while Tables 8 and 9 give the dimensions and forces of the scraper rings. Tables 8 and 9, respectively, offer a choice bet
21、ween the following two radial wall thicknesses: radial wall thickness “regular”; radial wall thickness “D/22”. The common features and dimensional tables presented in this International Standard constitute a broad range of variables and the designer, in selecting a particular ring type, shall bear i
22、n mind the conditions under which it will be required to operate. It is also essential that the designer refer to the specifications and requirements of ISO 6621-3 4and ISO 6621-4 before completing his/her selection. 4 Ring types and designation examples 4.1 Types N, NM, E, and EM scraper rings Gene
23、ral features The general features of types N, NM, E, and EM scraper rings are shown in Figure 1. NOTE See Tables 8 and 9 for dimensions and forces. INTERNATIONAL ST ANDARD ISO 6623:2013(E) ISO 2013 All rights reserved 1BS ISO 6623:2013ISO 6623:2013(E) Key a See 4.2, 4.3, 4.4, and 4.5 and Figures 2,
24、3, 4, and 5 for detail X of N, NM, E, and EM, respectively. Figure 1 Types N, NM, E, and EM 4.2 Type N 4.2.1 Napier ring (undercut step) The general features of type N Napier rings with an undercut step shall be in accordance with Figures 1 and 2, except for rings h 1 1,5 mm. Key 1 reference plane 2
25、 top side identification mark a When the ring is closed, this edge shall be in contact with the cylinder bore. b See Table 1. Figure 2 Type N (Detail X of Figure 1)2 ISO 2013 All rights reservedBS ISO 6623:2013ISO 6623:2013(E) Table 1 r 2dimensions Dimensions in millimetres d 1 r 2max. 30 d 1 175 0,
26、3 175 d 1 200 0,7 4.2.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6623, being a cast iron Napier ring with a straight-faced peripheral surface (N), of nominal diameter d 1= 90 mm (90), of radial wall thickness “regular”, of nominal ring width h 1= 2,5 mm
27、 (2,5), made of non-heat-treated grey cast iron subclass 12 (MC12), and with chamfered internal edges (KI):Piston ring ISO 6623 N - 90 2,5 - MC12/K I NOTE Parameters in parentheses are used in the ISO ring designation. 4.3 Type NM 4.3.1 Napier ring (undercut step), taper faced The general features o
28、f type NM Napier rings with an undercut step, taper faced, shall be in accordance with Figures 1 and 3, except for rings h 1 1,5 mm. Key 1 reference plane 2 top side identification mark a See Table 1. Figure 3 Type NM (Detail X of Figure 1) ISO 2013 All rights reserved 3BS ISO 6623:2013ISO 6623:2013
29、(E) Table 2 Taper Dimensions in minutes Code Uncoated rings and chromium-plated or spray-coated rings with peripheral surface ground Taper Tolerance a M2 30 +60 0 M3 60 M4 90 aFor chromium-plated rings with a tapered peripheral surface that is not ground, the tolerance shall be increased by 10 (e.g.
30、 ). 4.3.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6623, being a cast iron Napier ring with a 90 taper-faced peripheral surface (NM4), of nominal diameter d 1= 90 mm (90), of radial wall thickness “regular”, of ring width h 1= 2,5 mm (2,5), made of heat
31、-treated grey cast iron subclass 21 (MC21), and phosphated on all sides (PO):Piston ring ISO 6623 NM4 - 90 2,5 - MC21/PO NOTE Parameters in parentheses are used in the ISO ring designation. 4.4 Type E 4.4.1 Scraper ring (stepped) The general features of type E stepped scraper rings shall be in accor
32、dance with Figures 1 and 4. Key 1 reference plane 2 top side identification mark a When the ring is closed, this edge shall be in contact with the cylinder bore. b See Table 1. Figure 4 Type E (Detail X of Figure 1)4 ISO 2013 All rights reservedBS ISO 6623:2013ISO 6623:2013(E) 4.4.2 Designation EXAM
33、PLE Designation of a piston ring complying with the requirements of ISO 6623, being a cast iron scraper ring with a straight-faced peripheral surface (E), of nominal diameter d 1= 90 mm (90), of nominal ring width h 1= 2,5 mm (2,5), of radial wall thickness “regular”, made of non-heat-treated grey c
34、ast iron subclass 12 (MC12), and with an inlaid spray coating on the peripheral surface, and minimum thickness 0,1 mm (SC2F):Piston ring ISO 6623 E - 90 2,5 - MC12/SC2F NOTE Parameters in parentheses are used in the ISO ring designation. 4.5 Type EM 4.5.1 Scraper ring (stepped), taper faced The gene
35、ral features of type EM scraper rings, stepped and taper faced, shall be in accordance with Figures 1 and 5. Key 1 reference plane 2 top side identification mark a See Table 1. b See Table 2. Figure 5 Type EM (Detail X of Figure 1) 4.5.2 Designation EXAMPLE Designation of a piston ring complying wit
36、h the requirements of ISO 6623, being a cast iron scraper ring with a 30 taper-faced peripheral surface (EM2), of nominal diameter d 1= 90 mm (90), of nominal ring width h 1= 2,5 mm (2,5), of radial wall thickness “regular”, made of heat-treated grey cast iron subclass 22 (MC22), and with inside cha
37、mfered edges (KI):Piston ring ISO 6623 EM2 - 90 2,5 - MC22/KI NOTE Parameters in parentheses are used in the ISO ring designation. ISO 2013 All rights reserved 5BS ISO 6623:2013ISO 6623:2013(E) 5 Common features 5.1 Type N, NM, E, and EM rings Inside chamfered edges (KI) Dimensions in millimetres a)
38、 For nominal KI 0,3 b) For nominal KI 0,3 Key 1 top side identification mark Figure 6 Inside chamfered edges (KI) Table 3 KI dimensions Dimensions in millimetres d 1 KI 30 d 1 50 0,2 max. 50 d 1 125 0,3 0,15 a 125 d 1 175 0,4 0,15 175 d 1 200 0,6 0,2 aKI = 0,2 max. for rings 50 d 1 60 and h 1 1,56 I
39、SO 2013 All rights reservedBS ISO 6623:2013ISO 6623:2013(E) 5.2 Type NM and EM rings with a partly cylindrical machined (LM) or lapped (LP) pe- ripheral surface at the bottom running edge a) Feature: machined = Code: LM b) Feature: lapped = Code: LP Figure 7 NM and EM rings with partly cylindrical p
40、eripheral surface Table 4 Axial dimensions of cylindrical part of peripheral surface h 24 Dimensions in millimetres h 1 h 24 amax. h 24 aeach side of the gap up to 30 max. 1,2 0,4 0,6 1,5 0,5 0,8 1,75 0,6 1,0 2,0 0,7 1,2 2,5 0,9 1,4 3 h 1 4 1,1 1,8 aPartly cylindrical peripheral surface shall be vis
41、ible. 5.3 Type N, NM, E, and EM rings (chromium plated/spray coated) 5.3.1 Chromium-plated NM and EM rings a) NM rings b) EM rings Figure 8 Plating thickness 5.3.2 Spray-coated (inlaid design) N, NM, E, and EM rings NOTE Not recommended for rings h 1 1,5 mm. ISO 2013 All rights reserved 7BS ISO 6623
42、:2013ISO 6623:2013(E) a) N rings b) NM rings c) E rings d) EM rings Figure 9 Coating thickness Table 5 Plating/coating thickness Dimensions in millimetres Code Thickness min. Chromium plating Spray coating CRF 0,005 CR1 SC1F 0,05 CR2 SC2F 0,1 SC3F 0,15 SC4F 0,2 5.4 Napier or scraper ring with reduce
43、d undercut or step (mini Napier/stepped) RU A Napier or scraper ring with reduced undercut (mini Napier/stepped) rings Code RU has the following undercut dimensions: a 2and h 2is 0,5 times the value given in Tables 8 and 9. F tand F dis 1,085 times the F tand F dgiven in Tables 8 and 9. 5.4.1 Design
44、ation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6623, being a cast iron scraper ring with a 30 taper-faced peripheral surface and a reduced undercut (EM2RU), of nominal diameter d 1= 90 mm (90), of nominal ring width h 1= 2,5 mm (2,5), of radial wall thickness “regu
45、lar”, made of heat-treated grey cast iron subclass 22 (MC22), and with inside chamfered edges (KI):Piston ring ISO 6623 EM2RU - 90 2,5 - MC22/KI NOTE Parameters in parentheses are used in the ISO ring designation. 6 Force factors The tangential and diametral forces given in Tables 8 and 9 shall be c
46、orrected when additional features and/or materials other than grey cast iron with a modulus of elasticity of 100 GN/m 2are being used. For general features, the multiplier factors given in Tables 6 and 7 and the force correction factors according to ISO 6621-4 shall be used. NOTE The factors in Tabl
47、e 7 have been calculated with mean coating thickness.8 ISO 2013 All rights reservedBS ISO 6623:2013ISO 6623:2013(E) Table 6 Force correction factors for N, NM, E, and EM rings with feature KI d 1mm Factor 30 d 1 50 1 50 d 1 200 0,97 Table 7 Force correction factors for N, NM, E, and EM rings chromiu
48、m plated (fully faced type) and spray coated (inlaid type) d 1mm Factor CRF CR1 CR2 SC1F SC2F SC3F SC4F 30 d 1 50 1 0,84 0,77 0,89 0,85 50 d 1 75 1 0,91 0,85 0,92 0,90 0,87 0,86 75 d 1 100 1 0,94 0,92 0,94 0,92 0,90 0,87 100 d 1 125 1 0,97 0,94 0,94 0,93 0,91 0,89 125 d 1 150 1 0,98 0,96 0,95 0,93 0,91 0,90 150 d 1 200 1 1 0,97 0,95 0,94 0,93 0,91 ISO 2013 All rights reserved 9BS ISO 6623:2013ISO 6623:2013(E) 7 Dimensions Table 8 Dimensions for Type N, NM, E, and EM scraper rings (radial wall thickness “regular”) Nominal Radial wall Ring width Closed gap aAxial width of step d a h s h
