1、BSI Standards PublicationBS ISO 6623:2013Internal combustion engines Piston rings Scraper ringsmade of cast ironBS ISO 6623:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6623:2013. Itsupersedes BS ISO 6623:2004 which is withdrawn.The UK participation in
2、its preparation was entrusted to TechnicalCommittee MCE/14/-/10, RIC engines - Cylinders, pistons and rings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users a
3、re responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 72527 2ICS 43.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theSt
4、andards Policy and Strategy Committee on 31 July 2013.Amendments issued since publicationDate Text affectedBS ISO 6623:2013 ISO 2013Internal combustion engines Piston rings Scraper rings made of cast ironMoteurs combustion interne Segments de piston Segments racleurs mixtes en fonte mouleINTERNATION
5、AL STANDARDISO6623Third edition2013-07-15Reference numberISO 6623:2013(E)BS ISO 6623:2013ISO 6623:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any for
6、m 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 copyright officeCase postale 56 C
7、H-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6623:2013ISO 6623:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Overview . 14 Ring types and designatio
8、n examples 14.1 Types N, NM, E, and EM scraper rings General features 14.2 Type N . 24.3 Type NM 34.4 Type E . 44.5 Type EM 55 Common features . 65.1 Type N, NM, E, and EM rings Inside chamfered edges (KI) . 65.2 Type NM and EM rings with a partly cylindrical machined (LM) or lapped (LP) peripheral
9、surface at the bottom running edge 75.3 Type N, NM, E, and EM rings (chromium plated/spray coated) . 75.4 Napier or scraper ring with reduced undercut or step (mini Napier/stepped) RU 86 Force factors 87 Dimensions 10Bibliography .26BS ISO 6623:2013ISO 6623:2013(E)ForewordISO (the International Orga
10、nization 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 in a subject for which a technical committee has been establis
11、hed 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 Commission (IEC) on all matters of electrotechnical standardization
12、.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 should be noted. This document was drafted in accordance with th
13、e editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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. Details of any patent righ
14、ts 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/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee resp
15、onsible 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)IntroductionISO 6623 is one of a number of series of International
16、 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 662716(see Bibliography for details). ISO 2013 All rights reserved vBS ISO 6623:2013BS ISO 6623:2013Internal combustion eng
17、ines Piston rings Scraper rings made of cast iron1 ScopeThis 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 and including 200 mm, used in reciprocating internal combustion engines for r
18、oad vehicles and other applications.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the refer
19、enced document (including any amendments) applies.ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications3 OverviewThe scraper ring types are specified in Tables 1 and 2 and Figures 1 to 5. Their common features and the dimensions of those features are specified in Tables
20、 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 between the following two radial wall thicknesses: radial wall thickness “regular”; ra
21、dial 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 in mind the conditions under which it will be required to operate.It is also essentia
22、l that the designer refer to the specifications and requirements of ISO 6621-34and ISO 6621-4 before completing his/her selection.4 Ring types and designation examples4.1 Types N, NM, E, and EM scraper rings General featuresThe general features of types N, NM, E, and EM scraper rings are shown in Fi
23、gure 1.NOTE See Tables 8 and 9 for dimensions and forces.INTERNATIONAL STANDARD ISO 6623:2013(E) ISO 2013 All rights reserved 1BS ISO 6623:2013ISO 6623:2013(E)Keya See 4.2, 4.3, 4.4, and 4.5 and Figures 2, 3, 4, and 5 for detail X of N, NM, E, and EM, respectively.Figure 1 Types N, NM, E, and EM4.2
24、Type N4.2.1 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 h1 1,5 mm.Key1 reference plane2 top side identification markaWhen the ring is closed, this edge shall be in contact with the cylinder
25、 bore.bSee 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 r2dimensionsDimensions in millimetresd1r2max.30 d1 175 0,3175 d1 200 0,74.2.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6623, be
26、ing a cast iron Napier ring with a straight-faced peripheral surface (N), of nominal diameter d1= 90 mm (90), of radial wall thickness “regular”, of nominal ring width h1= 2,5 mm (2,5), made of non-heat-treated grey cast iron subclass 12 (MC12), and with chamfered internal edges (KI):Piston ring ISO
27、 6623 N - 90 2,5 - MC12/K INOTE Parameters in parentheses are used in the ISO ring designation.4.3 Type NM4.3.1 Napier ring (undercut step), taper facedThe general features of type NM Napier rings with an undercut step, taper faced, shall be in accordance with Figures 1 and 3, except for rings h1 1,
28、5 mm.Key1 reference plane2 top side identification markaSee Table 1.Figure 3 Type NM (Detail X of Figure 1) ISO 2013 All rights reserved 3BS ISO 6623:2013ISO 6623:2013(E)Table 2 TaperDimensions in minutesCodeUncoated rings and chromium-plated or spray-coated rings with peripheral surface groundTaper
29、 ToleranceaM2 30 +600M3 60M4 90aFor chromium-plated rings with a tapered peripheral surface that is not ground, the tolerance shall be increased by 10 (e.g. M3 60070=+).4.3.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6623, being a cast iron Napier ring wi
30、th a 90 taper-faced peripheral surface (NM4), of nominal diameter d1= 90 mm (90), of radial wall thickness “regular”, of ring width h1= 2,5 mm (2,5), made of heat-treated grey cast iron subclass 21 (MC21), and phosphated on all sides (PO):Piston ring ISO 6623 NM4 - 90 2,5 - MC21/PONOTE Parameters in
31、 parentheses are used in the ISO ring designation.4.4 Type E4.4.1 Scraper ring (stepped)The general features of type E stepped scraper rings shall be in accordance with Figures 1 and 4.Key1 reference plane2 top side identification markaWhen the ring is closed, this edge shall be in contact with the
32、cylinder bore.bSee 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 DesignationEXAMPLE 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
33、), of nominal diameter d1= 90 mm (90), of nominal ring width h1= 2,5 mm (2,5), of radial wall thickness “regular”, made of non-heat-treated grey cast 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
34、,5 - MC12/SC2FNOTE Parameters in parentheses are used in the ISO ring designation.4.5 Type EM4.5.1 Scraper ring (stepped), taper facedThe general features of type EM scraper rings, stepped and taper faced, shall be in accordance with Figures 1 and 5.Key1 reference plane2 top side identification mark
35、aSee Table 1.bSee Table 2.Figure 5 Type EM (Detail X of Figure 1)4.5.2 DesignationEXAMPLE 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 (EM2), of nominal diameter d1= 90 mm (90), of nominal ring width
36、 h1= 2,5 mm (2,5), of radial wall thickness “regular”, made of heat-treated grey cast iron subclass 22 (MC22), and with inside chamfered edges (KI):Piston ring ISO 6623 EM2 - 90 2,5 - MC22/KINOTE Parameters in parentheses are used in the ISO ring designation. ISO 2013 All rights reserved 5BS ISO 662
37、3:2013ISO 6623:2013(E)5 Common features5.1 Type N, NM, E, and EM rings Inside chamfered edges (KI)Dimensions in millimetresa) For nominal KI 0,3 b) For nominal KI 0,3Key1 top side identification markFigure 6 Inside chamfered edges (KI)Table 3 KI dimensionsDimensions in millimetresd1KI30 d1 50 0,2 ma
38、x.50 d1 125 0,3 0,15a125 d1 175 0,4 0,15175 d1 200 0,6 0,2aKI = 0,2 max. for rings 50 d1 60 and h1 1,56 ISO 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 edgea) Feature
39、: machined = Code: LM b) Feature: lapped = Code: LPFigure 7 NM and EM rings with partly cylindrical peripheral surfaceTable 4 Axial dimensions of cylindrical part of peripheral surface h24Dimensions in millimetresh1h24amax.h24aeach side of the gap up to 30 max.1,2 0,4 0,61,5 0,5 0,81,75 0,6 1,02,0 0
40、,7 1,22,5 0,9 1,43 h1 4 1,1 1,8aPartly cylindrical peripheral surface shall be visible.5.3 Type N, NM, E, and EM rings (chromium plated/spray coated)5.3.1 Chromium-plated NM and EM ringsa) NM rings b) EM ringsFigure 8 Plating thickness5.3.2 Spray-coated (inlaid design) N, NM, E, and EM ringsNOTE Not
41、 recommended for rings h1 1,5 mm. ISO 2013 All rights reserved 7BS ISO 6623:2013ISO 6623:2013(E)a) N rings b) NM rings c) E rings d) EM ringsFigure 9 Coating thicknessTable 5 Plating/coating thicknessDimensions in millimetresCodeThickness min.Chromium plating Spray coatingCRF 0,005CR1 SC1F 0,05CR2 S
42、C2F 0,1 SC3F 0,15 SC4F 0,25.4 Napier or scraper ring with reduced undercut or step (mini Napier/stepped) RUA Napier or scraper ring with reduced undercut (mini Napier/stepped) rings Code RU has the following undercut dimensions: a2and h2is 0,5 times the value given in Tables 8 and 9. Ftand Fdis 1,08
43、5 times the Ftand Fdgiven in Tables 8 and 9.5.4.1 DesignationEXAMPLE 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 d1= 90 mm (90), of nominal ring w
44、idth h1= 2,5 mm (2,5), of radial wall thickness “regular”, 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/KINOTE Parameters in parentheses are used in the ISO ring designation.6 Force factorsThe tangential and d
45、iametral forces given in Tables 8 and 9 shall be corrected when additional features and/or materials other than grey cast iron with a modulus of elasticity of 100 GN/m2are being used.For general features, the multiplier factors given in Tables 6 and 7 and the force correction factors according to IS
46、O 6621-4 shall be used.NOTE The factors in Table 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 KId1mmFactor30 d1 50 150 d1 200 0,97Table 7 Force correction fact
47、ors for N, NM, E, and EM rings chromium plated (fully faced type) and spray coated (inlaid type)d1mmFactorCRF CR1 CR2 SC1F SC2F SC3F SC4F30 d1 50 1 0,84 0,77 0,89 0,85 50 d1 75 1 0,91 0,85 0,92 0,90 0,87 0,8675 d1 100 1 0,94 0,92 0,94 0,92 0,90 0,87100 d1 125 1 0,97 0,94 0,94 0,93 0,91 0,89125 d1 15
48、0 1 0,98 0,96 0,95 0,93 0,91 0,90150 d1 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 DimensionsTable 8 Dimensions for Type N, NM, E, and EM scraper rings (radial wall thickness “regular”)Nominal Radial wall Ring width Closed gapaAxial width of step
49、 d1 a1 h1 s1 h2 mm mm mm mm mm (Tolerance 0,15) Tolerance Column Tolerance Tolerance for h1 shown in Column 1 2 3 4 5 1 2 3 4 5 30 1,25 0,15 Within a ring: 0,15 1,2 1,5 1,75 2 2,5 0,01 0,03 For phosphated PO surface: 0,005 0,03 0,15 + 0,2 0 0,35 0,4 0,45 0,5 0,6 31 1,30 32 1,35 33 1,40 34 1,40 35 1,45 36 1,50 37 1,55 38 1,60 39 1,65 40 1,65 41 1,70 42 1,75 43 1,8
