1、BSI Standards Publication BS ISO 6624-4:2016 Internal combustion engines Piston rings Part 4: Half keystone rings made of steelBS ISO 6624-4:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6624-4:2016. It supersedes BS ISO 6624-4:2003 which is withdrawn.
2、 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 pro
3、visions 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 74657 4 ICS 43.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was p
4、ublished under the authority of the Standards Policy and Strategy Committee on 31 March 2016. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 6624-4:2016 ISO 2016 Internal combustion engines Piston rings Part 4: Half keystone rings made of steel Moteurs combustion i
5、nterne Segments de piston Partie 4: Segments semi-trapzodaux en acier INTERNATIONAL STANDARD ISO 6624-4 Second edition 2016-02-15 Reference number ISO 6624-4:2016(E)BS ISO 6624-4:2016ISO 6624-4:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All
6、 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. Permission can be requested fr
7、om 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 6624-4:2016ISO 6624-4:2016(E)Foreword iv Introduc
8、tion 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 4.2.2 Designation . 4 4.3 Type
9、 HKBA Asymmetrical Barrel faced half keystone ring 7 (not recommended for nitrided rings of code NT) 4 4.3.1 General features 4 4.3.2 Designation . 6 5 Common features . 6 5.1 Type HK, HKB and HKBA Half keystone rings 6 5.1.1 Nitrided rings (not recommended for HKBA rings with Nitrided code NT) 6 5.
10、1.2 PVD rings 6 5.1.3 Chromium plated or spray coated rings 7 5.2 Type HK, HKB and HKBA rings Outside and inside rounded edges . 7 5.3 Type HK, HKB and HKBA rings (fully faced and inlaid) Plating/coating thickness . 8 5.4 Type HK, HKB and HKBA rings Nitrided case depth . 9 6 Force factors .10 7 Dime
11、nsions and forces 10 Annex A (normative) Calculation of measurement width h 3of half keystone rings .19 Bibliography .20 ISO 2016 All rights reserved iii Contents PageBS ISO 6624-4:2016ISO 6624-4:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of n
12、ational 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 established has the right to be represented on that committee. Inter
13、national 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. The procedures used to develop this document and those int
14、ended 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 the editorial rules of the ISO/IEC Directives, Part 2 (see ww
15、w.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 identifying any or all such patent rights. Details of any patent rights identified during the development of the document
16、 will be in the Introduction and/or on the ISO list of patent declarations 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 ex
17、pressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles 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
18、34, Propulsion, powertrain and powertrain fluids. This second edition cancels 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
19、of cast iron Part 2: Half keystone rings made of cast iron Part 3: Keystone 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) Introduction ISO 6624 is one of a number of series of International Standards dealing with pist
20、on rings for reciprocating internal combustion engines. Others are ISO 6621, 2345ISO 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 steel
21、1 Scope This part of ISO 6624 specifies the essential dimensional features of half keystone 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
22、. 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 edition cited applies. For undated references, the latest edition of the referenced document (including any ame
23、ndments) applies. ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications 3 Overview The 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
24、4 to 10. Table 7 gives the force factors for the different ring types, while Table 8 gives the 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, t
25、he designer shall bear in 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 selection. 4 Ring types and designation examples NOTE For the angle of half ke
26、ystone rings, the same definition and measurement apply as for keystone rings (see ISO 66212). 4.1 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 A
27、nnex A. INTERNATIONAL ST ANDARD ISO 6624-4:2016(E) ISO 2016 All rights reserved 1BS ISO 6624-4:2016ISO 6624-4:2016(E) 1 2 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
28、 of a piston ring complying with the requirements of ISO 66244, being a 7 half keystone ring made of steel with a straight faced peripheral surface (HK), of nominal diameter d 1= 60 mm (60), of nominal ring width h 1= 1,2 mm (1,2), made of CrSi alloyed steel subclass 62 (MC62), and having a chromium
29、 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 6624-4 HK - 60 1,2 - MC62/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
30、type HKB. See Table 7 for dimensions and forces. h 3values are calculated based on Annex A.2 ISO 2016 All rights reservedBS ISO 6624-4:2016ISO 6624-4:2016(E) a 1 2 Key 1 reference plane (ring is positioned flat against datum A) 2 top side identification mark a Nominal. Figure 2 Type HKB ISO 2016 All
31、 rights reserved 3BS ISO 6624-4:2016ISO 6624-4:2016(E) Table 1 Symmetrical barrel dimensions and gauge width (h 8 ) Dimensions in millimetres 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,
32、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 width (h 8 ) only informative; may be used only if agreed between manufacturer and customer. 4.2.2 Designation EXAMPLE Designation of a piston ring complying with the
33、requirements of ISO 66244, being a half keystone ring made of steel with a barrel faced peripheral surface (HKB), of nominal diameter d 1= 60 mm (60), of nominal ring width h 1= 1,5 mm (1,5), made of martensitic steel 11 %Cr (min.) subclass 65 (MC65), and nitrided on the peripheral surface and side
34、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 designation: Piston ring ISO 6624-4 HKB - 60 1,5 - MC65/NT050 4.3 Type HKBA Asymmetrical Barrel faced half keystone ring 7 (n
35、ot recommended for nitrided rings of code NT) 4.3.1 General features See Table 7 for dimensions and forces. h 3values are calculated based on Annex A.4 ISO 2016 All rights reservedBS ISO 6624-4:2016ISO 6624-4:2016(E) 1 2 a Key 1 reference plane (ring is positioned flat against datum A) 2 top side id
36、entification mark a Nominal. Figure 3 Type HKBA Table 2 Asymmetrical barrel dimensions Dimensions in millimetres h 1 h 25 a h 26 h 26tol. h 27 t 2 b t 3 b 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.
37、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 2and/or t 3may be varied as agreed between manufacturer and customer. ISO 2016 All rights reserved 5BS ISO 6624-4:2016ISO 6624-4:2016(E) 4.3.2 Designation EXAMPLE Designation of a piston
38、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 d 1= 80 mm (80), of nominal ring width h 1= 2,0 mm (2,0), made of martensitic steel 11 %Cr min. subclass 65 (MC65), and PVD on
39、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/PC010 5 Common features 5.1 Type HK, HKB and HKBA Half keystone rings 5.1.1 Nitrided rings (not recomme
40、nded for HKBA rings with Nitrided code NT) 1 1 a) Type HK b) Type HKB Key 1 top side identification mark Figure 4 Nitrided rings 5.1.2 PVD rings 1 1 a) Type HKB b) Type HKBA Key 1 top side identification mark Figure 5 PVD rings6 ISO 2016 All rights reservedBS ISO 6624-4:2016ISO 6624-4:2016(E) 5.1.3
41、Chromium plated or spray coated rings 5.1.3.1 Fully faced 1 1 1 a) Type HK b) Type HKB c) Type HKBA Key 1 top side identification mark Figure 6 Fully faced rings 5.1.3.2 Inlaid (not recommended for chromium plated rings) 1 1 1 a) Type HK b) Type HKB c) Type HKBA Key 1 top side identification mark Fi
42、gure 7 Inlaid rings 5.2 Type HK, HKB and HKBA rings Outside and inside rounded edges Figure 8 Outside and inside rounded edges ISO 2016 All rights reserved 7BS ISO 6624-4:2016ISO 6624-4:2016(E) Table 3 h xand h ydimensions Dimensions in millimetres h 1 h x max. h y max. 1,2 0,25 0,3 1,5 0,3 0,35 1,7
43、5 2,0 0,3 0,4 2,5 3,0 3,5 5.3 Type HK, HKB and HKBA rings (fully faced and inlaid) Plating/coating thickness a) Fully faced b) Inlaid Figure 9 Plating/coating thickness Table 4 Chromium plating/spray coating thickness Dimensions in millimetres Chromium plating code Spray coating code Thickness min.
44、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. Table 5 PVD coating thickness Dimensions in millimetres Code Peripheral surface min. PC001 0,001 PC003 0,003 PC005 0,005 anot typical for Diamond Like Carbon coatings (DLC)8 ISO 2016 All rights
45、reservedBS ISO 6624-4:2016ISO 6624-4:2016(E) Code Peripheral surface min. PC010 a 0,010 PC020 a 0,020 PC030 a 0,030 PC040 a 0,040 PC050 a 0,050 anot typical for Diamond Like Carbon coatings (DLC) 5.4 Type HK, HKB and HKBA rings Nitrided case depth Key 1 top side identification mark Figure 10 Nitride
46、d case depth Table 6 Nitrided case depth of peripheral surface and bottom side face Dimensions in millimetres Code Nitrided case depth min. Peripheral surface Bottom side face NB030 0,03 0,010 NB050 0,05 0,015 NB070 0,07 0,020 NB090 0,09 0,020 NB110 0,11 0,030 NB130 0,13 0,030 NOTE Nitrided case dep
47、th on top side face and on inside surface not specified. Table 7 Nitrided case depth of peripheral surface and side faces (not recommended for HKBA rings) Dimensions in millimetres Code Nitrided case depth min. Peripheral surface Side faces NT030 0,03 0,010 NT050 0,05 0,015 NT070 0,07 0,020 NT090 0,
48、09 0,020 NT110 0,11 0,030 NOTE Nitrided case depth on inside surface not specified.Table 5 (continued) ISO 2016 All rights reserved 9BS ISO 6624-4:2016ISO 6624-4:2016(E) Code Nitrided case depth min. Peripheral surface Side faces NT130 0,13 0,030 NOTE Nitrided case depth on inside surface not specif
49、ied. 6 Force factors The tangential and diametral forces given 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/(d 1 a 1 ), specified in ISO 6621-4, shall be used. Table 8 Force correction factors for chromium plated, spray coated, PVD
