1、BSI Standards Publication BS ISO 6624-2:2016 Internal combustion engines Piston rings Part 2: Half keystone rings made of cast ironBS ISO 6624-2:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6624-2:2016. It supersedes BS ISO 6624-2:2003 which is withdr
2、awn. The UK participation 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
3、 provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 74656 7 ICS 43.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard w
4、as published under the authority of the Standards Policy and Strategy Committee on 29 February 2016. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 6624-2:2016 ISO 2016 Internal combustion engines Piston rings Part 2: Half keystone rings made of cast iron Moteurs c
5、ombustion interne Segments de piston Partie 2: Segments demi-trapzodaux fabriqus en fonte moule INTERNATIONAL STANDARD ISO 6624-2 Second edition 2016-02-15 Reference number ISO 6624-2:2016(E)BS ISO 6624-2:2016ISO 6624-2:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Pu
6、blished in Switzerland All rights reserved. Unless otherwise 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. Perm
7、ission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 6624-2:2016ISO 6624-2:2
8、016(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 Overview . 1 4 Ring types and designation examples 1 4.1 Type HK Straight faced half keystone ring 7 1 4.1.1 General features 1 4.1.2 Designation . 2 4.2 Type HKB Barrel faced half keystone ring 7 2 4.2.1 General features 2 4.2.
9、2 Designation . 4 4.3 Type HKBA Asymmetrical barrel faced half keystone ring 7(h 1 1,2 mm) . 4 4.3.1 General features 4 4.3.2 Designation . 5 5 Common features . 5 5.1 Type HK, HKB and HKBA Half keystone ring . 5 5.1.1 Uncoated rings . 5 5.1.2 Chromium plated or spray coated rings 6 5.2 Chamfered ed
10、ges Type HK, HKB and HKBA rings Outside and/or inside chamfered edges (KA, KI) 7 5.3 Type HK, HKB and HKBA rings (fully faced, semi-inlaid) Plating/coating thickness . 7 6 Force factors 8 7 Dimensions and forces . 8 Annex A (normative) Calculation of measurement width h 3of half keystone rings .17 B
11、ibliography .18 ISO 2016 All rights reserved iii Contents PageBS ISO 6624-2:2016ISO 6624-2:2016(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 c
12、arried 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 with ISO, also take part in the wor
13、k. 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 Directives, Part 1. In particular the diff
14、erent 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 of the elements of this document m
15、ay 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 declarations received (see www.iso.org/pate
16、nts). 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 ISOs adherence to the WTO princi
17、ples in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 34, Propulsion, powertrain and powertrain fluids. This second edition cancels and replaces the first edit
18、ion (ISO 6624-2:2003), 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 rings made of steel Part 4: H
19、alf keystone rings made of steeliv ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E) Introduction ISO 6624 is one of a number of series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6621, 2345ISO 6622, 67ISO 6623, 8I
20、SO 6625, 9ISO 6626, 101112and ISO 6627. 13 ISO 2016 All rights reserved vBS ISO 6624-2:2016BS ISO 6624-2:2016Internal combustion engines Piston rings Part 2: Half keystone rings made of cast iron 1 Scope This part of ISO 6624 specifies the essential dimensional features of half keystone rings made o
21、f cast iron, types HK, HKB and HKBA, having nominal diameters from 38 mm up to, and including, 160 mm, used in reciprocating internal combustion piston engines for road vehicles and other applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in
22、 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 specification
23、s 3 Overview The half keystone ring types are specified in Tables 1 and 2 and Figures 1 to 3. Their common features and the dimensions of those features are specified in Tables 3 and 4 and Figures 4 to 9. Tables 5 and 6 give the force factors for the different ring types, while Table 7 gives the dim
24、ensions 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 is al
25、so essential that the designer refer to the specifications and requirements of ISO 6621-3 4and ISO 6621-4 before completing selection. 4 Ring types and designation examples NOTE For the angle of half keystone rings, the same definition and measurement apply as for keystone rings (see ISO 6621-2). 4.
26、1 Type HK Straight faced half keystone ring 7 4.1.1 General features Figure 1 shows the general features of piston ring type HK. See Table 7 for dimensions and forces. h 3values are calculated based on Annex A. INTERNATIONAL ST ANDARD ISO 6624-2:2016(E) ISO 2016 All rights reserved 1BS ISO 6624-2:20
27、16ISO 6624-2:2016(E) 1 2 a b Key 1 reference plane (ring is positioned flat against datum A) 2 top side identification mark a Nominal. b t = 0,006 h 1 . Figure 1 Type HK 4.1.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-2, being a 7 half keystone ring
28、 made of cast iron, with a straight-faced peripheral surface (HK), of d 1= 90 mm (90), of nominal ring width h 1= 1,5 mm (1,5), made of heat treated martensitic spheroidal graphite cast iron, subclass 53 (MC53), and having a chromium plated peripheral surface with a minimum thickness 0,1 mm (CR2). P
29、arameters in parenthesis are used in the ISO ring designation: Piston ring ISO 6624-2 HK - 90 1,5 - MC53/CR2 4.2 Type HKB Barrel faced half keystone ring 7 4.2.1 General features Figure 2 shows the general features of piston ring type HKB. See Table 7 for dimensions and forces. h 3values are calcula
30、ted based on Annex A.2 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E) 1 2 a Key 1 reference plane (ring is positioned flat against datum A) 2 top side identification mark a Nominal. Figure 2 Type HKB Table 1 Symmetrical barrel dimensions and gauge width (h 8 ) Dimensions in millime
31、tres h 1 h 25 h 26 h 26tol. h 27 t 2 , t 3 h 8 a 1,2 0,30 0,60 0,20 0,90 0,002.0,012 0,60 1,5 0,35 0,75 0,25 1,15 0,003.0,015 0,80 1,75 0,35 0,85 0,30 1,35 1,00 2,0 0,40 1,00 0,30 1,60 1,20 2,5 0,45 1,25 0,40 2,05 1,60 3,0 0,50 1,50 0,50 2,50 0,005.0,020 2,00 3,5 0,55 1,75 0,50 2,95 2,40 aGauge widt
32、h (h 8 ) only informative; may be used only if agreed between the manufacturer and the customer. ISO 2016 All rights reserved 3BS ISO 6624-2:2016ISO 6624-2:2016(E) 4.2.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-2, being a 7 half keystone ring made
33、of cast iron, with a barrel faced peripheral surface (HKB), of d 1= 90 mm (90), of nominal ring width h 1= 1,5 mm (1,5), made of non-heat-treated grey cast iron, subclass 12 (MC12), and having a chromium plated peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in parenthesis ar
34、e used in the ISO ring designation: Piston ring ISO 6624-2 HKB - 90 1,5 - MC12/CR2 4.3 Type HKBA Asymmetrical barrel faced half keystone ring 7(h 1 1,2 mm) 4.3.1 General features See Table 7 for dimensions and forces. h 3values are calculated based on Annex A. a 1 2 Key 1 reference plane (ring is po
35、sitioned flat against datum A) 2 top side identification mark a Nominal. Figure 3 Type HKBA4 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E) Table 2 Asymmetrical barrel dimensions Dimensions in millimetres h 1 h 25a h 26 h 26tol. h 27 t 2b t 3b 1,2 0,28 0,43 0,15 0,90 00,005 0,0050,
36、016 1,5 0,35 0,50 1,15 0.0,006 0,007.0,022 1,75 0,35 0,55 0,20 1,35 0.0,007 0,008.0,025 2,0 0,40 0,60 1,50 0,009.0,030 2,5 0,45 0,70 0,25 1,80 0.0,008 0,011.0,035 3,0 0,55 0,80 2,10 0,012.0,038 3,5 0,60 0,90 0,30 2,40 0.0,009 0,012.0,040 ah 25may be lowered for rings with reduced edge dimensions. bt
37、 2and/or t 3may be varied as agreed between the manufacturer and the customer. 4.3.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-2, being a 7 half keystone ring made of cast iron, with an asymmetrical barrel faced peripheral surface (HKBA), of d 1= 90
38、 mm (90), of nominal ring width h 1= 1,5 mm (1,5), made of non-heat-treated grey cast iron, subclass 12 (MC12), 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 designation: Piston ring ISO 6624-2 HKBA - 90 1
39、,5 - MC12/CR2 5 Common features 5.1 Type HK, HKB and HKBA Half keystone ring 5.1.1 Uncoated rings 1 1 a) Type HK b) Type HKB c) Type HKBA Key 1 top side identification mark Figure 4 Uncoated rings ISO 2016 All rights reserved 5BS ISO 6624-2:2016ISO 6624-2:2016(E) 5.1.2 Chromium plated or spray coate
40、d rings 5.1.2.1 Fully faced 1 1 1 a) Type HK b) Type HKB c) Type HKBA Key 1 top side identification mark Figure 5 Fully faced rings 5.1.2.2 Semi-inlaid 1 1 1 a) Type HK b) Type HKB c) Type HKBA Key 1 top side identification mark Figure 6 Semi-inlaid rings 5.1.2.3 Inlaid (not recommended for chromium
41、 plated rings) 1 1 1 a) Type HK b) Type HKB c) Type HKBA Key 1 top side identification mark Figure 7 Inlaid rings6 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E) 5.2 Chamfered edges Type HK, HKB and HKBA rings Outside and/or inside chamfered edges (KA, KI) a) HK rings b) HKB rings
42、c) HKBA rings d) Chamfered edges Key 1 top side identification mark Figure 8 Details of chamfered edges (KA, KI) Table 3 KA and KI dimensions Dimensions in millimetres d 1 KA KI 38 d 1 50 0,2 max. 0,2 max. 50 d 1 125 0,3 0,1 0,3 0,15 125 d 1 160 0,4 0,1 0,4 0,15 5.3 Type HK, HKB and HKBA rings (full
43、y faced, semi-inlaid) Plating/coating thickness a) Fully faced b) Semi-inlaid c) Inlaid Figure 9 Plating/coating thickness ISO 2016 All rights reserved 7BS ISO 6624-2:2016ISO 6624-2:2016(E) Table 4 Plating/coating thickness Dimensions in millimetres Chromium plating code Spray coating code Thickness
44、 min. CRF 0,005 CR1 SC1 0,05 CR2 SC2 0,10 CR3 a SC3 a 0,15 CR4 a SC4 a 0,20 aNot recommended for rings h 1 1,5. 6 Force factors The tangential and diametral forces given in Table 7 shall be corrected when additional features or materials other than grey cast iron with a modulus of elasticity, E n ,
45、of 100 GN/m 2 , or both, are used. For common features, multiplier correction factors given in Tables 5 and 6 and the force correction factors specified in ISO 6621-4 shall be used. Table 5 Force correction factors for HK, HKB and HKBA rings with features KA or KI Factor KA KI 0,98 0,98 Table 6 Forc
46、e correction factors for chromium plated and spray coated HK, HKB and HKBA rings (fully faced, semi-inlaid and inlaid type) d 1 mm Factor CRF CR1 CR2/SC1 CR3/SC2 CR4/SC3 SC4 38 d 1 50 1 0,81 0,70 0,64 50 d 1 75 1 0,90 0,85 0,81 0,75 0,71 75 d 1 100 1 0,92 0,88 0,85 0,81 0,77 100 d 1 125 1 0,94 0,91
47、0,88 0,86 0,83 125 d 1 160 1 0,95 0,92 0,90 0,88 0,85 7 Dimensions and forces See Table 7.8 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E) Table 7 Dimensions and forces of HK, HKB and HKBA half keystone rings Nominal diameter Radial wall thickness Nominal value of ring width Method
48、 AM ethod B d 1 a 1 h 1 a 6 a 7 Measured value, h 3 a b h 3 (ref.) Measured value b ColumnR ef. For h 1 shown in column Column a 6 Tolerance1 2345 12345T olerance 1234 5T olerance 38 1,6 0,15 Within a ring: 0,15 max. 1,2 0,6 0,5 max. 1,169 0 0,024 For phos - phated PO surface: 0,01 0,024 1,16 0,69 0
49、 0,19 For phos - phated PO surface: 0,08 0,19 39 1,65 40 1,65 0,81 ,143 1,13 0,90 41 1,7 42 1,75 43 1,8 44 1,85 45 1,9 46 1,9 47 1,95 48 2 49 2,05 50 2,1 1,5 1,0 1,1181 ,418 1,11 1,41 1,10 51 2,15 52 2,15 53 2,2 54 2,25 55 2,3 56 2,35 57 2,4 58 2,4 59 2,45 60 2,5 0,6 max. 1,1161 ,416 1,10 1,40 1,09 61 2,55 62 2,6 63 2,65 64 2,65 65 2,7 6
