1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Internal combustion engines Piston ringsPart 3: Keystone rings made of steelBS ISO 6624-3:2017 ISO 2017Internal combustion engines Piston rings Part 3:Keystone rings made of steelMoteurs combustion interne Segments de p
2、iston Partie 3: Segments trapzodaux en acierINTERNATIONALSTANDARDISO6624-3Second edition2017-04Reference numberISO 6624-3:2017(E)National forewordThis British Standard is the UK implementation of ISO 6624-3:2017. The UK participation in its preparation was entrusted to Technical Committee MCE/14/-/1
3、0, 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 contract. Users are responsible for its correct application. The British Stan
4、dards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 89502 9ICS 43.060.10Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2017.Am
5、endments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 6624-3:2017 ISO 2017Internal combustion engines Piston rings Part 3: Keystone rings made of steelMoteurs combustion interne Segments de piston Partie 3: Segments trapzodaux en acierINTERNATIONAL STANDARDISO6624-3Sec
6、ond edition2017-04Reference numberISO 6624-3:2017(E)BS ISO 6624-3:2017ISO 6624-3:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise i
7、n 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 copyright officeCh. de B
8、landonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 6624-3:2017ISO 6624-3:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative reference . 13 Terms and definitions . 14 Overview . 15 Ring types and designation examples 15
9、.1 Type T Straight faced keystone ring 6 . 15.1.1 General features 15.1.2 Designation . 25.2 Type TB Symmetrical barrel faced keystone ring 6 . 25.2.1 General features 25.2.2 Designation . 45.3 Type TBA Asymmetrical barrel faced keystone ring 6 45.3.1 General features 45.3.2 Designation . 55.4 Type
10、TM Taper faced keystone ring 6 55.4.1 General features 55.4.2 Designation . 75.5 Type K Straight faced keystone ring 15 75.5.1 General features 75.5.2 Designation . 75.6 Type KB Symmetrical barrel faced keystone ring 15 . 85.6.1 General features 85.6.2 Designation . 85.7 Type KBA Asymmetrical barrel
11、 faced keystone ring 15 95.7.1 General features 95.7.2 Designation . 95.8 Type KM Taper faced keystone ring 15 . 105.8.1 General features.105.8.2 Designation 106 Common features 106.1 Type T, TB, TBA, TM, K, KB, KBA, KM rings Outside and inside rounded edges .106.2 Type T, TB, TBA, TM, K, KB, KBA, K
12、M rings (positive twist type) Internal bevel top side 116.3 Type TM or KM rings with partly cylindrical machined (LM) or lapped (LP) peripheral surface . 126.4 Type T, TB, TBA, TM, K, KB, KBA, KM rings Plating or coating configuration .126.4.1 Chromium plated or spray coated rings .126.4.2 Nitrided
13、surface .146.4.3 PVD rings . 157 Force factors .15Bibliography .23 ISO 2017 All rights reserved iiiContents PageBS ISO 6624-3:2017ISO 6624-3:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
14、 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 represented on that committee. International organizations, governmental and non-governmental
15、, 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.The procedures used to develop this document and those intended for its further maintenance are described in the ISO
16、/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 the editorial rules of the ISO/IEC Directives, Part 2. www .iso .org/ directivesAttention is drawn to the possibility t
17、hat 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 rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent
18、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.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity
19、assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
20、Propulsion, powertrain and powertrain fluids.This second edition cancels and replaces the first edition (ISO 6624-3:2001), which has been technically revised. The main changes compared to the previous edition are as follows: PVD rings were included; and updates were made regarding technology improve
21、ments.A list of all the parts in the ISO 6624 series can be found on the ISO website.iv ISO 2017 All rights reservedBS ISO 6624-3:2017ISO 6624-3:2017(E)IntroductionISO 6624 is one of a number of series of International Standards dealing with piston rings for reciprocating internal combustion engines
22、. Others are ISO 66212.3,4,5, ISO 66226,7, ISO 66238, ISO 66259, ISO 662610,11, 12and ISO 662713.The common features and dimensional tables presented in this document constitute a broad range of variables and, in selecting a particular ring type, the designer must bear in mind the conditions under w
23、hich it will be required to operate.It is also essential that the designer refers to the specifications and requirements of ISO 6621-34and ISO 6621-4 before completing a selection. ISO 2017 All rights reserved vBS ISO 6624-3:2017BS ISO 6624-3:2017Internal combustion engines Piston rings Part 3: Keys
24、tone rings made of steel1 ScopeThis document specifies the essential dimensional features of keystone rings made of steel, types T, TB, TBA, TM, K, KB, KBA and KM, having diameters from 70 mm up to and including 160 mm, used in reciprocating internal combustion piston engines.2 Normative referenceTh
25、e following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
26、ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications3 Terms and definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :
27、/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp4 OverviewThe keystone ring types are specified in Tables 1 to 3 and Figures 1 to 8. Their common features and the dimensions of those features are specified in Tables 4 to 9 and Figures 9 to 15. Tables
28、 11 and 12 give the force factors for the different types of rings, while Table 13 and Table 14 give the dimensions and forces of keystone rings 6 and 15, respectively.5 Ring types and designation examples5.1 Type T Straight faced keystone ring 65.1.1 General featuresSee Table 13 for dimensions and
29、forces.INTERNATIONAL STANDARD ISO 6624-3:2017(E) ISO 2017 All rights reserved 1BS ISO 6624-3:2017ISO 6624-3:2017(E)Dimensions in millimetresKey1 reference planeaDue to manufacturing processing, side angle tolerances are not cumulative.bNominal.Figure 1 Type T5.1.2 DesignationEXAMPLE Designation of a
30、 piston ring complying with the requirements of ISO 6624-3, being a steel, 6 keystone ring with straight-faced peripheral surface (T), of nominal diameter d1= 90 mm (90) and nominal ring width h1= 2,5 mm (2,5), made of CrSi alloyed steel, subclass 62 (MC 62), and having a fully faced chromium plated
31、 peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-3 T - 90 x 2,5-MC 62/CR25.2 Type TB Symmetrical barrel faced keystone ring 65.2.1 General featuresSee Table 13 for dimensions and forces.2 ISO 2017 All ri
32、ghts reservedBS ISO 6624-3:2017ISO 6624-3:2017(E)Dimensions in millimetresKey1 reference planeaDue to manufacturing processing, side angle tolerances are not cumulative.bNominal.Figure 2 Type TBTable 1 Symmetrical barrel dimensionsDimensions in millimetresh1h25h26h27t2, t3h8aTolerance 2,0 0,40 1,00
33、0,30 1,600,003.0,0151,22,5 0,45 1,25 0,40 2,05 1,63,0 0,50 1,500,502,500,005.0,0202,03,5 0,55 1,75 2,95 2,44,0 0,60 2,00 0,60 3,40 0,005.0,023 2,8aGauge width h8, informative only, shall be used only if agreed between the manufacturer and customer. ISO 2017 All rights reserved 3BS ISO 6624-3:2017ISO
34、 6624-3:2017(E)5.2.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-3, being a steel, 6 keystone ring with barrel faced peripheral surface (TB), of nominal diameter d1= 90 mm (90) and nominal ring width h1= 2,5 mm (2,5), made of martensitic steel (11 % Cr
35、 min.), subclass 65 (MC 65), nitrided on the peripheral surface and side faces (NT) to a depth of 0,070 mm min. on the peripheral surface (070), and with an associated side face depth of a minimum of 0,020 mm. Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-3 TB -
36、 90 x 2,5-MC 65/NT0705.3 Type TBA Asymmetrical barrel faced keystone ring 65.3.1 General featuresSee Table 13 for dimensions and forces.Dimensions in millimetresKey1 reference plane2 top side identification markaDue to manufacturing processing, side angle tolerances are not cumulative.bNominal.Figur
37、e 3 Type TBA4 ISO 2017 All rights reservedBS ISO 6624-3:2017ISO 6624-3:2017(E)Table 2 Asymmetrical barrel dimensionsDimensions in millimetresh1h25ah26h27t2bt3bTolerance2,00 0,40 0,60 0,20 1,50 0.0,007 0,009.0,0302,50 0,45 0,700,251,800.0,0080,011.0,0353,00 0,55 0,80 2,10 0,012.0,0383,50 0,60 0,900,3
38、02,400.0,0090,012.0,0404,00 0,65 0,95 2,80 0,013.0,045ah25may be lowered for rings with reduced edge dimensions.bt2or t3or both may be varied as agreed between the manufacturer and customer.5.3.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-3, being a s
39、teel, 6 keystone ring with asymmetrical barrel faced peripheral surface (TBA), of nominal diameter d1= 90 mm (90) and nominal ring width h1= 2,5 mm (2,5), made of martensitic steel (17 % Cr min.), subclass 66 (MC 66), nitrided on the peripheral surface and side faces (NT) to a minimum depth of 0,070
40、 mm on the peripheral surface (070), and with an associated side face depth of a minimum of 0,020 mm. Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-3 TBA - 90 x 2,5-MC 66/NT0705.4 Type TM Taper faced keystone ring 65.4.1 General featuresSee Table 13 for dimensio
41、ns and forces. ISO 2017 All rights reserved 5BS ISO 6624-3:2017ISO 6624-3:2017(E)Dimensions in millimetresKey1 reference plane2 top side identification markaDue to manufacturing processing, side angle tolerances are not cumulative.bNominal.Figure 4 Type TMTable 3 TaperDimensions in minutesCode Taper
42、 ToleranceaInternal twist feature designsToleranceaM1b10050+060+M2M3M4M5306090120060+070+aFor chromium plated rings with a tapered peripheral surface that is not ground, the tolerance shall be increased by 10 (e.g. M3 = 60 tolerance: 070+; M3 with internal features = 60 tolerance: 080+).bM1 not for
43、rings with partly cylindrical peripheral surface.6 ISO 2017 All rights reservedBS ISO 6624-3:2017ISO 6624-3:2017(E)5.4.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-3, being a steel, 6 keystone ring with 10 taper faced peripheral surface (TM1), of nomi
44、nal diameter d1= 90 mm (90) and nominal ring width h1= 2,5 mm (2,5), made of martensitic steel (11 % CR min.), subclass 65 (MC 65), and having a fully faced chromium plated peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in parenthesis are used in the ISO ring designation:Pis
45、ton ring ISO 6624-3 - TM1 x 2,5-MC 65/CR25.5 Type K Straight faced keystone ring 155.5.1 General featuresSee Table 14 for dimensions and forces.Dimensions in millimetresKey1 reference planeaDue to manufacturing processing, side angle tolerances are not cumulative.bNominal.Figure 5 Type K5.5.2 Design
46、ationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-3, being a steel, 15 keystone ring with straight-faced peripheral surface (K), of nominal diameter d1= 90 mm (90) and nominal ring width h1= 2,5 mm (2,5), made of CrMoV alloyed steel, subclass 61 (MC 61), and havin
47、g a fully faced chromium plated peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-3 K - 90 x 2,5-MC 61/CR2 ISO 2017 All rights reserved 7BS ISO 6624-3:2017ISO 6624-3:2017(E)5.6 Type KB Symmetrical barrel f
48、aced keystone ring 155.6.1 General featuresSee Table 1 for symmetrical barrel dimensions. See Table 14 for dimensions and forces.Dimensions in millimetresKey1 reference planeaDue to manufacturing processing, side angle tolerances are not cumulative.bNominal.Figure 6 Type KB5.6.2 DesignationEXAMPLE D
49、esignation of a piston ring complying with the requirements of ISO 6624-3, being a steel, 15 keystone ring with barrel faced peripheral surface (KB), of nominal diameter d1= 90 mm (90) and nominal ring width h1= 2,5 mm (2,5), made of martensitic steel (17 % Cr min.), subclass 66 (MC 66), nitrided on the peripheral surface and side faces (NT), to a minimum depth of 0,090 mm on the peripheral surface
