BS ISO 6621-4-2015 en_6826 Internal combustion engines Piston rings General specifications《内燃机.活塞环.一般规范》.pdf
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1、BSI Standards Publication BS ISO 6621-4:2015 Internal combustion engines Piston rings Part 4: General specificationsBS ISO 6621-4:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6621-4:2015. It supersedes BS ISO 6621-4:2003 which is withdrawn. The UK par
2、ticipation 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 provisions of
3、a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 74522 5 ICS 43.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published un
4、der the authority of the Standards Policy and Strategy Committee on 31 March 2015. Amendments/corrigenda issued since publication Date Text affectedBS ISO 6621-4:2015 ISO 2015 Internal combustion engines Piston rings Part 4: General specifications Moteurs combustion interne Segments de piston Partie
5、 4: Spcifications gnrales INTERNATIONAL STANDARD ISO 6621-4 Third edition 2015-03-15 Reference number ISO 6621-4:2015(E)BS ISO 6621-4:2015ISO 6621-4:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015 All rights reserved. Unless otherwise specified, no part of this publicati
6、on 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 below or ISOs member body in the country o
7、f the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 6621-4:2015ISO 6621-4:2015(E) ISO 2015 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope
8、. 1 2 Normative references 1 3 Terms and definitions . 1 4 Piston ring codes 1 5 Designation of piston rings 4 5.1 Designation elements and order . 4 5.2 Designation examples . 5 6 Marking of piston rings . 6 6.1 General . 6 6.2 Mandatory topside identification marking . 6 6.3 Additional marking . 7
9、 7 General characteristics 7 7.1 Ring shape . 7 7.2 Light tightness . 8 7.3 Closed gap . 8 7.4 Tangential force, F t , and diametral force, F d , of single piece piston rings 8 7.5 Tangential force F tof multipiece oil control rings as specified in ISO 6626-1, ISO 6626-2, and ISO 6626-3 12 7.6 Tange
10、ntial force F tof expander/segment oil control rings as specified in ISO 6627 .13 8 Notches for preventing ring rotation .13 8.1 Ring joint with internal notch (only for compression rings as specified in ISO 6622 and ISO 6624) 13 8.2 Ring joint with side notch (only for compression rings as specifie
11、d in ISO 6622) .15 9 Machining of surfaces .16 9.1 Peripheral surfaces .16 9.2 Side faces .16 9.3 Other surfaces .16 10 Plated, coated, and treated surfaces .17 10.1 Chromium plating on peripheral surfaces .17 10.2 Spray coated peripheral surfaces .20 10.3 Nitrided surfaces 24 10.4 Treated surfaces
12、25 10.5 Physical vapour deposition coating (PVD) 26 11 Miscellaneous .27 11.1 Cleanliness .27 11.2 Corrosion protection .27 11.3 Packaging 27 12 Traceability (optional) 27 Bibliography .28BS ISO 6621-4:2015ISO 6621-4:2015(E) Foreword ISO (the International Organization for Standardization) is a worl
13、dwide 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 represented on
14、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 develop this d
15、ocument 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 ISO/IEC Direc
16、tives, Part 2 (see 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 the develo
17、pment of the document 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
18、specific terms and expressions 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 vehic
19、les. This third edition cancels and replaces the second edition (ISO 6621-4:2003), which has been technically revised. ISO 6621 consists of the following parts, under the general title Internal combustion engines Piston rings: Part 1: Vocabulary Part 2: Inspection measuring principles Part 3: Materi
20、al specifications Part 4: General specifications Part 5: Quality requirementsiv ISO 2015 All rights reservedBS ISO 6621-4:2015ISO 6621-4:2015(E) Introduction ISO 6621 is one of a series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO
21、 6622-1, ISO 6622-2, ISO 6623, ISO 6624-1, ISO 6624-2, ISO 6624-3, ISO 6624-4, ISO 6625, ISO 6626-1, ISO 6626-2, ISO 6626-3, and ISO 6627. ISO 2015 All rights reserved vBS ISO 6621-4:2015BS ISO 6621-4:2015Internal combustion engines Piston rings Part 4: General specifications 1 Scope This part of IS
22、O 6621 specifies the general characteristics of piston rings for reciprocating internal combustion engines for road vehicles and other applications (the individual dimensional criteria for these rings are given in the relevant International Standards). It also provides a system for ring coding, desi
23、gnation, and marking. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm. 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
24、 the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6507-3, Metallic materials Vickers hardness test Part 3: Calibration of reference blocks ISO 6621-1, Internal combustion engines Piston rings Part 1: Vocabulary I
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