1、BSI Standards PublicationBS ISO 6624-4:2016Internal combustion engines Piston ringsPart 4: Half keystone rings made of steelBS ISO 6624-4:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6624-4:2016.It supersedes BS ISO 6624-4:2003 which is withdrawn.The UK
2、 participation in 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
3、 contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 74657 4ICS 43.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the
4、authority of theStandards Policy and Strategy Committee on 31 March 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 6624-4:2016 ISO 2016Internal combustion engines Piston rings Part 4: Half keystone rings made of steelMoteurs combustion interne Segments de pisto
5、n Partie 4: Segments semi-trapzodaux en acierINTERNATIONAL STANDARDISO6624-4Second edition2016-02-15Reference numberISO 6624-4:2016(E)BS ISO 6624-4:2016ISO 6624-4:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwis
6、e specified, no part of this publication may be reproduced 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 belo
7、w or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 6624-4:2016ISO 6624-4:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 1
8、3 Overview . 14 Ring types and designation examples 14.1 Type HK Straight faced half keystone ring 7 14.1.1 General features 14.1.2 Designation . 24.2 Type HKB Barrel faced half keystone ring 7 24.2.1 General features 24.2.2 Designation . 44.3 Type HKBA Asymmetrical Barrel faced half keystone ring 7
9、 (not recommended for nitrided rings of code NT) 44.3.1 General features 44.3.2 Designation . 65 Common features . 65.1 Type HK, HKB and HKBA Half keystone rings 65.1.1 Nitrided rings (not recommended for HKBA rings with Nitrided code NT) 65.1.2 PVD rings 65.1.3 Chromium plated or spray coated rings
10、 75.2 Type HK, HKB and HKBA rings Outside and inside rounded edges . 75.3 Type HK, HKB and HKBA rings (fully faced and inlaid) Plating/coating thickness . 85.4 Type HK, HKB and HKBA rings Nitrided case depth . 96 Force factors .107 Dimensions and forces 10Annex A (normative) Calculation of measureme
11、nt width h3of half keystone rings .19Bibliography .20 ISO 2016 All rights reserved iiiContents PageBS ISO 6624-4:2016ISO 6624-4:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing In
12、ternational 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, in liaison
13、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/IEC Directiv
14、es, 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 (see www.iso.org/directives). Attention is drawn to the possibility that some
15、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 declarati
16、ons received (see www.iso.org/patents). Any 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 meaning of ISO specific terms and expressions related to conformity assessment, as well as information about
17、 ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 34, Propulsion, powertrain and powertrain fluids.This second edition canc
18、els and replaces the first edition (ISO 6624-4:2003), which has been technically revised.ISO 6624 consists of the following parts, under the general title Internal combustion engines Piston rings: Part 1: Keystone rings made of cast iron Part 2: Half keystone rings made of cast iron Part 3: Keystone
19、 rings made of steel Part 4: Half keystone rings made of steeliv ISO 2016 All rights reservedBS ISO 6624-4:2016ISO 6624-4:2016(E)IntroductionISO 6624 is one of a number of series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6621,2
20、345ISO 6622,6,7ISO 6623,8ISO 6625,9ISO 6626,101112and ISO 6627.13 ISO 2016 All rights reserved vBS ISO 6624-4:2016BS ISO 6624-4:2016Internal combustion engines Piston rings Part 4: Half keystone rings made of steel1 ScopeThis part of ISO 6624 specifies the essential dimensional features of half keys
21、tone rings made of steel, types HK, HKB and HKBA, having nominal diameters from 50 mm up to, and including, 160 mm, used in reciprocating internal combustion piston engines for road vehicles and other applications.2 Normative referencesThe following documents, in whole or in part, are normatively re
22、ferenced 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 referenced document (including any amendments) applies.ISO 6621-4, Internal combustion engines Piston rings Part 4: General spe
23、cifications3 OverviewThe half keystone ring types are specified in Tables 1 and 2 and Figures 1, 2 and 3. Their common features and the dimensions of those features are specified in Tables 3 to 6 and Figures 4 to 10. Table 7 gives the force factors for the different ring types, while Table 8 gives t
24、he dimensions and forces of half keystone rings.The common features and dimensional tables presented in this part of ISO 6624 constitute a broad range of variables and, in selecting a particular ring type, the designer shall bear in mind the conditions under which it will be required to operate.It i
25、s also essential that the designer refer to the specifications and requirements of ISO 6621-34and ISO 6621-4 before completing selection.4 Ring types and designation examplesNOTE For the angle of half keystone rings, the same definition and measurement apply as for keystone rings (see ISO 66212).4.1
26、 Type HK Straight faced half keystone ring 74.1.1 General featuresFigure 1 shows the general features of piston ring type HK.See Table 7 for dimensions and forces.h3values are calculated based on Annex A.INTERNATIONAL STANDARD ISO 6624-4:2016(E) ISO 2016 All rights reserved 1BS ISO 6624-4:2016ISO 66
27、24-4:2016(E)12Key1 reference plane (ring is positioned flat against datum A)2 top side identification markaNominal.bt = 0,006 h1.Figure 1 Type HK4.1.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 66244, being a 7 half keystone ring made of steel with a strai
28、ght faced peripheral surface (HK), of nominal diameter d1= 60 mm (60), of nominal ring width h1= 1,2 mm (1,2), made of CrSi alloyed steel subclass 62 (MC62), and having a chromium plated peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in parenthesis are used in the ISO ring d
29、esignation:Piston ring ISO 6624-4 HK - 60 1,2 - MC62/CR24.2 Type HKB Barrel faced half keystone ring 74.2.1 General featuresFigure 2 shows the general features of piston ring type HKB.See Table 7 for dimensions and forces.h3values are calculated based on Annex A.2 ISO 2016 All rights reservedBS ISO
30、6624-4:2016ISO 6624-4:2016(E)a12Key1 reference plane (ring is positioned flat against datum A)2 top side identification markaNominal.Figure 2 Type HKB ISO 2016 All rights reserved 3BS ISO 6624-4:2016ISO 6624-4:2016(E)Table 1 Symmetrical barrel dimensions and gauge width (h8)Dimensions in millimetres
31、h1h25h26h26tol. h27t2, t3h8a1,2 0,30 0,60 0,20 0,90 0,002.0,012 0,601,5 0,35 0,75 0,25 1,150,003.0,0150,801,75 0,35 0,85 0,30 1,35 1,002,0 0,40 1,00 0,30 1,60 1,202,5 0,45 1,25 0,40 2,05 1,603,0 0,50 1,50 0,50 2,500,005.0,0202,003,5 0,55 1,75 0,50 2,95 2,40aGauge width (h8) only informative; may be
32、used only if agreed between manufacturer and customer.4.2.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 66244, being a half keystone ring made of steel with a barrel faced peripheral surface (HKB), of nominal diameter d1= 60 mm (60), of nominal ring width h
33、1= 1,5 mm (1,5), made of martensitic steel 11 %Cr (min.) subclass 65 (MC65), and nitrided on the peripheral surface and side faces (NT) to a depth of 0,050 mm min. on the peripheral surface (050), with an associated side face depth of 0,015 mm min. Parameters in parenthesis are used in the ISO ring
34、designation:Piston ring ISO 6624-4 HKB - 60 1,5 - MC65/NT0504.3 Type HKBA Asymmetrical Barrel faced half keystone ring 7 (not recommended for nitrided rings of code NT)4.3.1 General featuresSee Table 7 for dimensions and forces.h3values are calculated based on Annex A.4 ISO 2016 All rights reservedB
35、S ISO 6624-4:2016ISO 6624-4:2016(E)12aKey1 reference plane (ring is positioned flat against datum A)2 top side identification markaNominal.Figure 3 Type HKBATable 2 Asymmetrical barrel dimensionsDimensions in millimetresh1h25ah26h26tol. h27t2bt3b1,75 0,35 0,55 0,20 1,35 0.0,007 0,008.0,0252,0 0,40 0
36、,60 1,50 0,009.0,0302,5 0,45 0,70 0,25 1,80 0.0,008 0,011.0,0353,0 0,55 0,80 2,10 0,012.0,0383,5 0,60 0,90 0,30 2,40 0.0,009 0,012.0,040ah25may be lowered for rings with reduced edge dimensions.bt2and/or t3may be varied as agreed between manufacturer and customer. ISO 2016 All rights reserved 5BS IS
37、O 6624-4:2016ISO 6624-4:2016(E)4.3.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 66244, being a half keystone ring made of steel with an asymmetrical barrel faced peripheral surface (HKBA), of nominal diameter d1= 80 mm (80), of nominal ring width h1= 2,0 m
38、m (2,0), made of martensitic steel 11 %Cr min. subclass 65 (MC65), and PVD on the peripheral surface (PC) to a depth of 0,010 mm min. on the peripheral surface (010). Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-4 HKBA - 80 2,0 - MC65/PC0105 Common features5.1
39、Type HK, HKB and HKBA Half keystone rings5.1.1 Nitrided rings (not recommended for HKBA rings with Nitrided code NT)1 1a) Type HK b) Type HKBKey1 top side identification markFigure 4 Nitrided rings5.1.2 PVD rings1 1a) Type HKB b) Type HKBAKey1 top side identification markFigure 5 PVD rings6 ISO 2016
40、 All rights reservedBS ISO 6624-4:2016ISO 6624-4:2016(E)5.1.3 Chromium plated or spray coated rings5.1.3.1 Fully faced1 11a) Type HK b) Type HKB c) Type HKBAKey1 top side identification markFigure 6 Fully faced rings5.1.3.2 Inlaid (not recommended for chromium plated rings)1 1 1a) Type HK b) Type HK
41、B c) Type HKBAKey1 top side identification markFigure 7 Inlaid rings5.2 Type HK, HKB and HKBA rings Outside and inside rounded edgesFigure 8 Outside and inside rounded edges ISO 2016 All rights reserved 7BS ISO 6624-4:2016ISO 6624-4:2016(E)Table 3 hxand hydimensionsDimensions in millimetresh1hxmax.h
42、ymax.1,2 0,25 0,31,50,3 0,351,752,00,3 0,42,53,03,55.3 Type HK, HKB and HKBA rings (fully faced and inlaid) Plating/coating thicknessa) Fully faced b) InlaidFigure 9 Plating/coating thicknessTable 4 Chromium plating/spray coating thicknessDimensions in millimetresChromium platingcodeSpray coatingcod
43、eThicknessmin.CRF 0,005CR1 SC1 0,05CR2 SC2 0,10CR3aSC3a0,15CR4aSC4a0,20aNot recommended for rings h1 1,5.Table 5 PVD coating thicknessDimensions in millimetresCode Peripheral surface min.PC001 0,001PC003 0,003PC005 0,005anot typical for Diamond Like Carbon coatings (DLC)8 ISO 2016 All rights reserve
44、dBS ISO 6624-4:2016ISO 6624-4:2016(E)Code Peripheral surface min.PC010a0,010PC020a0,020PC030a0,030PC040a0,040PC050a0,050anot typical for Diamond Like Carbon coatings (DLC)5.4 Type HK, HKB and HKBA rings Nitrided case depthKey1 top side identification markFigure 10 Nitrided case depthTable 6 Nitrided
45、 case depth of peripheral surface and bottom side faceDimensions in millimetresCodeNitrided case depth min.Peripheral surface Bottom side faceNB030 0,03 0,010NB050 0,05 0,015NB070 0,07 0,020NB090 0,09 0,020NB110 0,11 0,030NB130 0,13 0,030NOTE Nitrided case depth on top side face and on inside surfac
46、e not specified.Table 7 Nitrided case depth of peripheral surface and side faces (not recommended for HKBA rings)Dimensions in millimetresCodeNitrided case depth min.Peripheral surface Side facesNT030 0,03 0,010NT050 0,05 0,015NT070 0,07 0,020NT090 0,09 0,020NT110 0,11 0,030NOTE Nitrided case depth
47、on inside surface not specified.Table 5 (continued) ISO 2016 All rights reserved 9BS ISO 6624-4:2016ISO 6624-4:2016(E)CodeNitrided case depth min.Peripheral surface Side facesNT130 0,13 0,030NOTE Nitrided case depth on inside surface not specified.6 Force factorsThe tangential and diametral forces g
48、iven in Table 9 shall be corrected when additional features are being used.For common features, multiplier correction factors given in Table 8 shall be used. The force correction factors for the ratio m/(d1 a1), specified in ISO 6621-4, shall be used.Table 8 Force correction factors for chromium pla
49、ted, spray coated, PVD coated and nitrided HK, HKB and HKBA ringsd1mmFactorCRF / PC001 PC030CR1 / PC040CR2/SC1 CR3/SC2 CR4/SC3 SC4NB030NB130 NT030NT13050 d1 75 1 0,87 0,81 0,75 0,69 0,64 1,0375 d1 100 1 0,91 0,86 0,82 0,78 0,74 1,03100 d1 125 1 0,93 0,89 0,86 0,82 0,79 1,03125 d1 160 1 0,94 0,91 0,89 0,86 0,83 1,037 Dimensions and forcesSee Table 9.Table 7 (continued)10 ISO 20
