1、BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 Internal combustion engines Piston rings Part 3: Keystone rings made of steel BS ISO 6624-3:2017 ISO 2017 Internal combustion engines Piston rings Part 3: Keystone rings made of steel Moteurs combustion interne Segmen
2、ts de piston Partie 3: Segments trapzodaux en acier INTERNATIONAL STANDARD ISO 6624-3 Second edition 2017-04 Reference number ISO 6624-3:2017(E) National foreword This British Standard is the UK implementation of ISO 6624-3:2017. The UK participation in its preparation was entrusted to Technical Com
3、mittee 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 provisions of a contract. Users are responsible for its correct applicatio
4、n. The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 0 580 89502 9 ICS 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 Committ
5、ee on 30 June 2017. Amendments/corrigenda issued since publication Date Text affected BRITISH STANDARD BS ISO 6624-3:2017 ISO 2017 Internal combustion engines Piston rings Part 3: Keystone rings made of steel Moteurs combustion interne Segments de piston Partie 3: Segments trapzodaux en acier INTERN
6、ATIONAL STANDARD ISO 6624-3 Second edition 2017-04 Reference number ISO 6624-3:2017(E) BS ISO 6624-3:2017 ISO 6624-3:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may
7、 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 below or ISOs member body in the country of the
8、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.org BS ISO 6624-3:2017 ISO 6624-3:2017(E)Foreword iv Introduction v 1 Scope . 1 2 Normative reference . 1 3 T erms and definitions . 1 4
9、 Overview . 1 5 Ring types and designation examples 1 5.1 Type T Straight faced keystone ring 6 . 1 5.1.1 General features 1 5.1.2 Designation . 2 5.2 Type TB Symmetrical barrel faced keystone ring 6 . 2 5.2.1 General features 2 5.2.2 Designation . 4 5.3 Type TBA Asymmetrical barrel faced keystone r
10、ing 6 4 5.3.1 General features 4 5.3.2 Designation . 5 5.4 Type TM Taper faced keystone ring 6 5 5.4.1 General features 5 5.4.2 Designation . 7 5.5 Type K Straight faced keystone ring 15 7 5.5.1 General features 7 5.5.2 Designation . 7 5.6 Type KB Symmetrical barrel faced keystone ring 15 . 8 5.6.1
11、General features 8 5.6.2 Designation . 8 5.7 Type KBA Asymmetrical barrel faced keystone ring 15 9 5.7.1 General features 9 5.7.2 Designation . 9 5.8 Type KM Taper faced keystone ring 15 .10 5.8.1 General features.10 5.8.2 Designation 10 6 Common features 10 6.1 Type T , TB, TBA, TM, K, KB, KBA, KM
12、rings Outside and inside rounded edges .10 6.2 Type T , TB, TBA, TM, K, KB, KBA, KM rings (positive twist type) Internal bevel top side11 6.3 Type TM or KM rings with partly cylindrical machined (LM) or lapped (LP) peripheral surface .12 6.4 Type T , TB, TBA, TM, K, KB, KBA, KM rings Plating or coat
13、ing configuration .12 6.4.1 Chromium plated or spray coated rings .12 6.4.2 Nitrided surface .14 6.4.3 PVD rings .15 7 Force factors .15 Bibliography .23 ISO 2017 All rights reserved iii Contents Page BS ISO 6624-3:2017 ISO 6624-3:2017(E) Foreword ISO (the International Organization for Standardizat
14、ion) 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 established has the right to be r
15、epresented 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. The procedures used to
16、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 the editorial rules of the
17、 ISO/IEC Directives, Part 2. www .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
18、 the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. 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 volunta
19、ry nature of standards, the meaning of ISO specific terms and expressions related to conformity 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: w w w . i s o .org/ iso/ foreword .
20、html. This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34, 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 previ
21、ous edition are as follows: PVD rings were included; and updates were made regarding technology improvements. A list of all the parts in the ISO 6624 series can be found on the ISO website.iv ISO 2017 All rights reserved BS ISO 6624-3:2017 ISO 6624-3:2017(E) Introduction ISO 6624 is one of a number
22、of series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6621 2.3,4,5 , ISO 6622 6,7 , ISO 6623 8 , ISO 6625 9 , ISO 6626 10,11, 12and ISO 6627 13 . The common features and dimensional tables presented in this document constitute a
23、broad range of variables and, in selecting a particular ring type, the designer must bear in mind the conditions under which it will be required to operate. It is also essential that the designer refers to the specifications and requirements of ISO 6621-3 4and ISO 6621-4 before completing a selectio
24、n. ISO 2017 All rights reserved v BS ISO 6624-3:2017BS ISO 6624-3:2017 Internal combustion engines Piston rings Part 3: Keystone rings made of steel 1 Scope This document specifies the essential dimensional features of keystone rings made of steel, types T, TB, TBA, TM, K, KB, KBA and KM, having dia
25、meters from 70 mm up to and including 160 mm, used in reciprocating internal combustion piston engines. 2 Normative reference The 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
26、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 specifications 3 T erms a nd definiti ons No terms and definitions are listed in this document. ISO an
27、d IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp 4 Overview The keystone ring types are specified in Tables 1 to 3
28、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 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, respecti
29、vely. 5 Ring types and designation examples 5.1 Type T Straight faced keystone ring 6 5.1.1 General features See Table 13 for dimensions and forces. INTERNATIONAL ST ANDARD ISO 6624-3:2017(E) ISO 2017 All rights reserved 1 BS ISO 6624-3:2017 ISO 6624-3:2017(E) Dimensions in millimetres Key 1 referen
30、ce plane a Due to manufacturing processing, side angle tolerances are not cumulative. b Nominal. Figure 1 Type T 5.1.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-3, being a steel, 6 keystone ring with straight-faced peripheral surface (T), of nominal
31、 diameter d 1= 90 mm (90) and nominal ring width h 1= 2,5 mm (2,5), made of CrSi alloyed steel, subclass 62 (MC 62), 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: Piston ring ISO 6
32、624-3 T - 90 x 2,5-MC 62/CR2 5.2 Type TB Symmetrical barrel faced keystone ring 6 5.2.1 General features See Table 13 for dimensions and forces.2 ISO 2017 All rights reserved BS ISO 6624-3:2017 ISO 6624-3:2017(E) Dimensions in millimetres Key 1 reference plane a Due to manufacturing processing, side
33、 angle tolerances are not cumulative. b Nominal. Figure 2 Type TB Table 1 Symmetrical barrel dimensions Dimensions in millimetres h 1 h 25 h 26 h 27 t 2 , t 3 h 8 aTolerance 2,0 0,40 1,00 0,30 1,60 0,003.0,015 1,2 2,5 0,45 1,25 0,40 2,05 1,6 3,0 0,50 1,50 0,50 2,50 0,005.0,020 2,0 3,5 0,55 1,75 2,95
34、 2,4 4,0 0,60 2,00 0,60 3,40 0,005.0,023 2,8 aGauge width h 8 , informative only, shall be used only if agreed between the manufacturer and customer. ISO 2017 All rights reserved 3 BS ISO 6624-3:2017 ISO 6624-3:2017(E) 5.2.2 Designation EXAMPLE Designation of a piston ring complying with the require
35、ments of ISO 6624-3, being a steel, 6 keystone ring with barrel faced peripheral surface (TB), of nominal diameter d 1= 90 mm (90) and nominal ring width h 1= 2,5 mm (2,5), made of martensitic steel (11 % Cr min.), subclass 65 (MC 65), nitrided on the peripheral surface and side faces (NT) to a dept
36、h 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 - 90 x 2,5-MC 65/NT070 5.3 Type TBA Asymmetrical barrel faced keystone ring 6 5.3.1 General f
37、eatures See Table 13 for dimensions and forces. Dimensions in millimetres Key 1 reference plane 2 top side identification mark a Due to manufacturing processing, side angle tolerances are not cumulative. b Nominal. Figure 3 Type TBA4 ISO 2017 All rights reserved BS ISO 6624-3:2017 ISO 6624-3:2017(E)
38、 Table 2 Asymmetrical barrel dimensions Dimensions in millimetres h 1 h 25a h 26 h 27 t 2b t 3b Tolerance 2,00 0,40 0,60 0,20 1,50 0.0,007 0,009.0,030 2,50 0,45 0,70 0,25 1,80 0.0,008 0,011.0,035 3,00 0,55 0,80 2,10 0,012.0,038 3,50 0,60 0,90 0,30 2,40 0.0,009 0,012.0,040 4,00 0,65 0,95 2,80 0,013.0
39、,045 ah 25may be lowered for rings with reduced edge dimensions. bt 2or t 3or both may be varied as agreed between the manufacturer and customer. 5.3.2 Designation EXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-3, being a steel, 6 keystone ring with asymmetrical bar
40、rel faced peripheral surface (TBA), of nominal diameter d 1= 90 mm (90) and nominal ring width h 1= 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 mm on the peripheral surface (070), and
41、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/NT070 5.4 Type TM Taper faced keystone ring 6 5.4.1 General features See Table 13 for dimensions and forces. ISO 2017 All rights re
42、served 5 BS ISO 6624-3:2017 ISO 6624-3:2017(E) Dimensions in millimetres Key 1 reference plane 2 top side identification mark a Due to manufacturing processing, side angle tolerances are not cumulative. b Nominal. Figure 4 Type TM Table 3 Taper Dimensions in minutes Code Taper Tolerance a Internal t
43、wist feature designs Tolerance a M1 b 10 M2 M3 M4 M5 30 60 90 120 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: ; M3 with internal features = 60 tolerance: ). bM1 not for rings with partly cylindrical
44、peripheral surface.6 ISO 2017 All rights reserved BS ISO 6624-3:2017 ISO 6624-3:2017(E) 5.4.2 Designation EXAMPLE 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 nominal diameter d 1= 90 mm (9
45、0) and nominal ring width h 1= 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: Piston ring ISO 6624-3 - T
46、M1 x 2,5-MC 65/CR2 5.5 Type K Straight faced keystone ring 15 5.5.1 General features See Table 14 for dimensions and forces. Dimensions in millimetres Key 1 reference plane a Due to manufacturing processing, side angle tolerances are not cumulative. b Nominal. Figure 5 Type K 5.5.2 Designation EXAMP
47、LE 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 d 1= 90 mm (90) and nominal ring width h 1= 2,5 mm (2,5), made of CrMoV alloyed steel, subclass 61 (MC 61), and having a full
48、y 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 7 BS ISO 6624-3:2017 ISO 6624-3:2017(E) 5.6 Type KB Symmetrical barrel faced
49、 keystone ring 15 5.6.1 General features See Table 1 for symmetrical barrel dimensions. See Table 14 for dimensions and forces. Dimensions in millimetres Key 1 reference plane a Due to manufacturing processing, side angle tolerances are not cumulative. b Nominal. Figure 6 Type KB 5.6.2 Designation EXAMPLE Designation of a piston ring complying with the r
