1、BS ISO 6626-3:2008 ICS 43.060.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Internal combustion engines Piston rings Part 3: Coil-spring-loaded oil control rings made of steelThis British Standard was published under the authority of the Standards Policy
2、and Strategy Committee on 31 July 2008 BSI 2008 ISBN 978 0 580 58539 5 Amendments/corrigenda issued since publication Date Comments BS ISO 6626-3:2008 National foreword This British Standard is the UK implementation of ISO 6626-3:2008. The UK participation in its preparation was entrusted to Technic
3、al 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 a contract. Users are responsible for its correct appl
4、ication. Compliance with a British Standard cannot confer immunity from legal obligations.BS ISO 6626-3:2008Reference number ISO 6626-3:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 6626-3 First edition 2008-06-15 Internal combustion engines Piston rings Part 3: Coil-spring-loaded oil control rings mad
5、e of steel Moteurs combustion interne Segments de piston Partie 3: Segments racleurs rgulateurs dhuile, en acier, mis en charge par ressort hlicodal BS ISO 6626-3:2008 ISO 6626-3:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this fil
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8、t the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may
9、be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. +
10、 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 6626-3:2008 ISO 6626-3:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Symbols . 1
11、4 Piston ring types and designation examples 2 4.1 Type SOR Steel oil control rings with R-shaped groove . 2 4.2 Type SOV Steel oil control rings with V-shaped groove 3 5 Common features . 4 5.1 Ring width h 1and radial wall thickness a 1 . 4 5.2 Land width h 5 . 5 5.3 Land angle , 5 5.4 Land spacin
12、g B 36 5.5 Slot sizes . 6 5.6 Nitrided surface. 7 5.7 Nominal contact pressure and tangential force 7 5.8 Tolerance of tangential force F t . 7 6 Coil springs . 8 6.1 Types of coil spring 8 6.2 Coil-spring excursion (extended gap) 10 6.3 Position of coil spring gap and fixing. 10 6.4 Material 10 7 T
13、ype SOR. 11 8 Type SOV . 11 9 Dimensions 12 Bibliography . 20 BS ISO 6626-3:2008 ISO 6626-3:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Inter
14、national 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. International organizations, governmental and non-governmental, in liaison wit
15、h ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technica
16、l committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to
17、 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. ISO 6626-3 was prepared by Technical Committee ISO/TC 22, Road vehicles. ISO 6626 consists of the following parts, under t
18、he general title Internal combustion engines Piston rings: Coil-spring-loaded oil control rings 1) Part 2: Coil-spring-loaded oil control rings of narrow width made of cast iron Part 3: Coil-spring-loaded oil control rings made of steel 1) ISO 6626:1989, published without a part number, is regarded
19、as the first part of the ISO 6626 series since publication of the other parts. BS ISO 6626-3:2008 ISO 6626-3:2008(E) ISO 2008 All rights reserved v Introduction ISO 6626 is one of a series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are
20、ISO 6621, ISO 6622, ISO 6623, ISO 6624, ISO 6625 and ISO 6627 (see Clause 2 and Bibliography). The common features and dimensional tables presented in this part of ISO 6626 constitute a broad range of variables and, in selecting a particular ring type, the designer will bear in mind the conditions u
21、nder which it will be required to operate. BS ISO 6626-3:2008BS ISO 6626-3:2008 INTERNATIONAL STANDARD ISO 6626-3:2008(E) ISO 2008 All rights reserved 1 Internal combustion engines Piston rings Part 3: Coil-spring-loaded oil control rings made of steel 1 Scope This part of ISO 6626 specifies the ess
22、ential dimensions of coil-spring-loaded, nitrided oil control rings made of steel, of piston ring types SOR (with R-shaped groove) and SOV (with V-shaped groove). This part of ISO 6626 applies to coil-spring-loaded, nitrided oil control rings made of steel with a diameter of between 60 mm and 200 mm
23、 inclusive for reciprocating internal combustion engines. It can also be used for piston rings of compressors working under analogous conditions. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition c
24、ited 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 Symbols The following symbols are used in this part of ISO 6626. NOTE These symbols (including
25、 associated indices) are in accordance with the symbols used in ISO 6621, ISO 6622, ISO 6623, ISO 6624, ISO 6625, ISO 6627 and other parts of ISO 6626. a 1radial wall thickness a 4groove depth a 12radial thickness over coil spring a 13groove depth and bridge a 14external land depth B 3land spacing c
26、 1slot width d 1nominal diameter (nominal bore diameter) d 7coil-spring diameter BS ISO 6626-3:2008 ISO 6626-3:2008(E) 2 ISO 2008 All rights reservedd 14coil-spring groove diameter for type SOR f 1coil-spring excursion F ttangential force h 1ring width h 5land width p 0contact pressure s 1closed gap
27、 w 1slot length w 3slot spacing land angle inside land angle outside groove angle for type SOV 4 Piston ring types and designation examples 4.1 Type SOR Steel oil control rings with R-shaped groove 4.1.1 General features and dimensions Figure 1 shows the general features and dimensions of piston rin
28、g type SOR. BS ISO 6626-3:2008 ISO 6626-3:2008(E) ISO 2008 All rights reserved 3 Dimensions in millimetres For definitions of symbols, see Clause 3. For dimensions, see Tables 3, 4, 5, 10, 13, 14, 15 and 16. Key 1 reference plane Figure 1 General features and dimensions of piston ring type SOR 4.1.2
29、 Designation EXAMPLE A coil-spring-loaded, nitrided oil control ring made of steel with R-shaped groove (SOR), a radial wall thickness class = small (S), of nominal diameter d 1= 100 mm (100), a nominal ring width h 1= 3 mm (3), a land width h 5= 0,20 mm (0,20), a nitrided depth of 0,030 mm min. (NT
30、030), coil spring with reduced heat set (WF), and variable pitch with coil diameter d 7ground (CSE), medium nominal contact pressure p 0= 1,5 MPa (PN1,5): Piston ring ISO 6626-3-SOR-S 100 x 3 x 0,20 NT030 WF CSE PN1,5 4.2 Type SOV Steel oil control rings with V-shaped groove 4.2.1 General features a
31、nd dimensions Figure 2 shows the general features and dimensions of piston ring type SOV. BS ISO 6626-3:2008 ISO 6626-3:2008(E) 4 ISO 2008 All rights reservedDimensions in millimetres For definitions of symbols, see Clause 3. For dimensions, see Tables 3, 4, 5, 11, 17, 18 and 19. Key 1 reference pla
32、ne Figure 2 General features and dimensions of piston ring type SOV 4.2.2 Designation EXAMPLE A coil-spring-loaded, nitrided oil control ring made of steel with V-shaped groove (SOV), a radial wall thickness class = small (S), V-shaped groove angle 40 (V40), of nominal diameter d 1= 100 mm (100), a
33、nominal ring width h 1= 3 mm (3), a land width h 5= 0,20 mm (0,20), a nitrided depth of 0,030 mm min. (NT030), coil spring with reduced heat set (WF), and constant pitch with coil diameter d 7ground (CSN), medium nominal contact pressure p 0= 1,5 MPa (PN1,5): Piston ring ISO 6626-3-SOV-S-V40-100 x 3
34、 x 0,20 NT030 WF CSN PN1,5 5 Common features 5.1 Ring width h 1and radial wall thickness a 1Table 1 shows common features for ring width h 1and radial wall thickness a 1 . BS ISO 6626-3:2008 ISO 6626-3:2008(E) ISO 2008 All rights reserved 5 Table 1 Ring width h 1and radial wall thickness a 1Dimensio
35、ns in millimetres Radial wall thickness 1 0,15 a Ring width 0,01 10 , 0 3 h = Small (Code: S) Large (Code: L) Type 2,0 1,8 to 2,0 SOR 2,5 1,8 to 2,0 SOR 3,0 1,8 to 2,0 2,3 to 2,6 SOR and SOV 4,0 2,0 to 2,6 2,8 to 3,2 SOR and SOV 5.2 Land width h 5Table 2 shows common features for land width h 5 . Ta
36、ble 2 Land width h 5Dimensions in millimetres Ring width h 1Land width 5 0, 07 h 2,0 0,20 2,5 0,20 0,25 3,0 0,20 0,25 0,30 4,0 0,20 a0,25 0,30 a For diameters greater than 120 mm and ring width equal to 4,0 mm, land width equal to 0,20 mm shall not be used.5.3 Land angle , Table 3 shows common featu
37、res for land angle , . Table 3 Land angle , Land angle Range of nominal angle Tolerance inside 5 to 20 a 5 outside 10 to 30 a 5 a Nominal angle subject to agreement between manufacturer and client.BS ISO 6626-3:2008 ISO 6626-3:2008(E) 6 ISO 2008 All rights reserved5.4 Land spacing B 3Table 4 shows c
38、ommon features for land spacing B 3 . Table 4 Land spacing B 3Dimensions in millimetres Ring width h 1Land spacing B 3a2,0 1,25 to 1,45 2,5 1,35 to 1,75 3,0 1,45 to 2,10 4,0 1,80 to 3,20 a() 31 0, 95 Bc + 5.5 Slot sizes Table 5 shows common features for slot sizes. Table 5 Standard slot sizes Dimens
39、ions in millimetres Ring width h 1Slot width c 1Slot length w 1Slot spacing w 32,0 0,3 to 0,5 1,4 to 2,5 5 to 10 2,5 0,4 to 0,6 2,0 to 3,0 5 to 10 3,0 0,5 to 0,7 2,5 to 3,5 5 to 10 4,0 0,6 to 1,0 3,0 to 5,0 5 to 10 Slots may open into the gap faces (see Figure 3). Figure 3 Arrangement of slots BS IS
40、O 6626-3:2008 ISO 6626-3:2008(E) ISO 2008 All rights reserved 7 5.6 Nitrided surface Table 6 shows common features for nitrided surfaces. Table 6 Nitrided case depth of peripheral surface and sideface Dimensions in millimetres Nitrided case depthaCode Peripheral surface min. Sideface min. NT010 0,01
41、0 0,005 NT030 0,030 0,010 NT050 0,050 0,015 a For tolerances, see ISO 6621-4.5.7 Nominal contact pressure and tangential force Table 7 shows common features for nominal contact pressure. Table 7 Nominal contact pressure classes Dimensions in millimetres Nominal contact pressure p 0MPa Ring width h 1
42、Code PN1,0 Code PN1,5 Code PN2,0 Code PN2,5 2,0 1,0 1,5 2,0 2,5 1,0 1,5 2,0 3,0 1,5 2,0 2,5 4,0 1,5 2,0 2,5 5.8 Tolerance of tangential force F tTable 8 shows common features for tangential force F t , where t150 F dhp = (1) Table 8 Tolerance of tangential force F tTangential force N Tolerance F t 2
43、0 4 N F tW 20 20 % BS ISO 6626-3:2008 ISO 6626-3:2008(E) 8 ISO 2008 All rights reserved6 Coil springs 6.1 Types of coil spring 6.1.1 All values in the dimensional tables are based on cylindrical coil springs made of round wire. The three designs shown in Figures 4 to 7 are common. 6.1.2 Figure 4 ill
44、ustrates the design of type CSN coil spring with constant pitch. Key 1 diameter of wire Figure 4 Type CSN coil spring 6.1.3 Figure 5 illustrates the design of type CSG coil spring with constant pitch (coil diameter d 7ground). Key 1 diameter of wire aApproximately 0,8 diameter of wire. Figure 5 Type
45、 CSG coil spring 6.1.4 Figure 6 illustrates the design of type CSE coil spring with variable pitch (coil diameter d 7ground), and Figure 7 shows the position of the area with small pitch. BS ISO 6626-3:2008 ISO 6626-3:2008(E) ISO 2008 All rights reserved 9Key 1 diameter of wire aApproximately 0,8 di
46、ameter of wire. Figure 6 Type CSE coil spring Dimensions in millimetres Key 1 spring gap 2 area with small pitch aLatch pin free length. bLatch pin fixed length. Figure 7 Position of area with small pitch NOTE The use of different spring designs can be agreed between manufacturer and client. Changed
47、 spring groove configurations and dimensions can then be necessary. BS ISO 6626-3:2008 ISO 6626-3:2008(E) 10 ISO 2008 All rights reserved6.2 Coil-spring excursion (extended gap) Coil-spring excursion, f 1 , is the distance between the ends of the ring gap, with unstressed ring, measured in the middl
48、e of the spring groove (see Figure 8 and Table 9). Figure 8 Coil-spring excursion Table 9 Coil-spring excursion Dimensions in millimetres Nominal diameter d 1Coil-spring excursion f 1max. 60 u d 1 100 0,1 d 1100 u d 1u 200 0,12 d 16.3 Position of coil spring gap and fixing The spring gap shall be ap
49、proximately 180 from the ring gap and the spring gap ends fixed with a connecting or latch pin. 6.4 Material Coil springs are made of materials as shown in ISO 6621-3:2000, Table 1, subclasses MC62 (valve spring wire), MC67 (stainless steel) and MC68 (piano wire). Springs are available with two different heat set resistance levels (loss of tangential force under load and temperature):
