1、BSI Standards PublicationBS ISO 6621-5:2013Internal combustion engines Piston ringsPart 5: Quality requirementsBS ISO 6621-5:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6621-5:2013. Itsupersedes BS ISO 6621-5:2005 which is withdrawn.The UK participatio
2、n 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 contract. Us
3、ers are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 69378 6ICS 43.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of
4、theStandards Policy and Strategy Committee on 30 September 2013.Amendments issued since publicationDate Text affectedBS ISO 6621-5:2013 ISO 2013Internal combustion engines Piston rings Part 5: Quality requirementsMoteurs combustion interne Segments de piston Partie 5: Exigences de qualitINTERNATIONA
5、L STANDARDISO6621-5Third edition2013-10-01Reference numberISO 6621-5:2013(E)BS ISO 6621-5:2013ISO 6621-5:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in
6、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 requester.ISO copyright officeCase posta
7、le 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6621-5:2013ISO 6621-5:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 V
8、isible defects 24.1 General . 24.2 Pores, cavities, and sand inclusions 24.3 Scratches, indentations, depressions, and cracks . 34.4 Edges 34.5 Other characteristics subject to visual inspection only 105 Material .115.1 Specifications. 115.2 Loss of tangential force under temperature effects .116 Ra
9、ised material caused by marking of rings 117 Machining of periphery and sides Unintentional deviation from ideal profile and flatness .127.1 General 127.2 Permissible deviations for peripheral surface profile .127.3 Permissible helix 13Bibliography .14BS ISO 6621-5:2013ISO 6621-5:2013(E)ForewordISO
10、(the International Organization for Standardization) 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 comm
11、ittee 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 work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrote
12、chnical 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 different approval criteria needed for the different types of ISO documents should be noted. This document was drafte
13、d in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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. Det
14、ails 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. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorse
15、ment.The committee responsible for this document is ISO/TC 22, Road vehicles.This third edition cancels and replaces the second edition (ISO 6621-5:2005), of which it constitutes a minor revision.ISO 6621 consists of the following parts, under the general title Internal combustion engines Piston rin
16、gs: Part 1: Vocabulary Part 2: Inspection measuring principles Part 3: Material specifications Part 4: General specifications Part 5: Quality requirementsiv ISO 2013 All rights reservedBS ISO 6621-5:2013ISO 6621-5:2013(E)IntroductionThis International Standard is one of a number of series of Interna
17、tional Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6622, ISO 6623, ISO 6624, ISO 6625, ISO 6626, and ISO 6627.The common features and dimensional tables presented in this part of ISO 6621 constitute a broad range of variables, and the designer, i
18、n selecting a particular ring type, should bear in mind the conditions under which it will be required to operate. The designer also refers to the specifications and requirements of ISO 6621-3 and ISO 6621-4 before completing his selection.The difficulty of trying to define in absolute terms the qua
19、lity attainable in normal commercial manufacture of piston rings is well known. In this part of ISO 6621, the commonly encountered aspects of quality in terms of casting defects and other departures from ideal are quantified. Many minor defects are clearly quite acceptable; other defects because of
20、size or number are inadmissible. ISO 2013 All rights reserved vBS ISO 6621-5:2013BS ISO 6621-5:2013Internal combustion engines Piston rings Part 5: Quality requirements1 ScopeThis part of ISO 6621 specifies those quality aspects that are capable of definition but not normally found on a drawing spec
21、ification.It is applicable to the following: single-piece piston rings of grey cast iron or steel; multi-piece piston rings (oil control rings) consisting of cast iron parts and spring components; single-piece and multi-piece oil control rings of steel, i.e. oil control rings in the form of strip st
22、eel components or steel segments (rails) with spring expander components.In addition to specifying certain of the limits of acceptance relating to inspection measuring principles (covered by ISO 6621-2), this part of ISO 6621 also covers those features for which no recognized quantitative measuremen
23、t procedures exist and which are only checked visually with normal eyesight (spectacles if worn normally) and without magnification. Such features (superficial defects) are additional to the standard tolerances of ring width, radial wall thickness, and closed gap.This part of ISO 6621 does not estab
24、lish acceptable quality levels (AQL), it being left to manufacturer and client to decide the appropriate levels jointly. In this case, the recommendations of ISO 2859 are followed.This part of ISO 6621 specifies the quality requirements of piston rings for reciprocating internal combustion engines f
25、or road vehicles and other applications. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated
26、 references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6621-1, Internal combustion engines Piston rings Part 1: VocabularyISO 6621-3, Internal combustion engines Piston rings Part 3: Material specifica
27、tionsISO 6622 (all parts), Internal combustion engines Piston ringsISO 6623, Internal combustion engines Piston rings Scraper rings made of cast ironISO 6624 (all parts), Internal combustion engines Piston ringsISO 6625, Internal combustion engines Piston rings Oil control ringsISO 6626, Internal co
28、mbustion engines Piston rings Coil-spring-loaded oil control ringsISO 6626-2, Internal combustion engines Piston rings Part 2: Coil-spring-loaded oil control rings of narrow width made of cast ironINTERNATIONAL STANDARD ISO 6621-5:2013(E) ISO 2013 All rights reserved 1BS ISO 6621-5:2013ISO 6621-5:20
29、13(E)ISO 6626-3, Internal combustion engines Piston rings Part 3: Coil-spring-loaded oil control rings made of steelISO 6627, Internal combustion engines Piston rings Expander/segment oil-control rings3 Terms and definitionsFor the purposes of this document, the terms and definitions in ISO 6621-1 a
30、pply.4 Visible defects4.1 GeneralVisible defects are divided into two principal classes as described in 4.2 to 4.5.The first class covers those defects frequently found in castings and includes such defects as porosity, sand inclusions, cavities, etc.The second class of defects covers mechanical abr
31、asions which may occur during forming, machining, or handling of the rings and includes scratches, dents, chipping, burrs, and cracks.Inspection of piston rings for such defects is generally carried out visually, without magnification, by inspectors having normal eyesight, corrected if necessary.It
32、is not intended that every ring be rigorously inspected for size and distribution of defects, but rather that the values given in the tables and text be used as a general guide. However, in case of doubt, the values given should be used as the means of judging the quality of the rings.4.2 Pores, cav
33、ities, and sand inclusionsSuch defects are permissible on uncoated surfaces and edges provided that the values given in Table 1 for size, number, and spacing are not exceeded.Table 1 Permissible values of size, number, and spacing of pores, cavities, and sand inclusionsDimensions in millimetresNomin
34、al diameter d1Defect size max.Number of defects per ring max.Spacing of defectscmin.On peripheral surfaceaOn other surfacesaOn peripheral edgesOn other edgesb30 d11,5 0,380 d1 125 0,5125 d1 175 0,7175 d1 200 1 ISO 2013 All rights reserved 13BS ISO 6621-5:2013ISO 6621-5:2013(E)Bibliography1 ISO 6621-
35、2, Internal combustion engines Piston rings Part 2: Inspection measuring principles2 ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications14 ISO 2013 All rights reservedBS ISO 6621-5:2013BS ISO 6621-5:2013ISO 6621-5:2013(E) ISO 2013 All rights reservedICS 43.060.10Price
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