1、BS ISO6626-3:2008ICS 43.060.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDInternal combustionengines Piston ringsPart 3: Coil-spring-loaded oil controlrings made of steelThis British Standardwas published under theauthority of the StandardsPolicy and Strateg
2、yCommittee on 31 July 2008 BSI 2008ISBN 978 0 580 58539 5Amendments/corrigenda issued since publicationDate CommentsBS ISO 6626-3:2008National forewordThis British Standard is the UK implementation of ISO 6626-3:2008.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/14/
3、-/10, RIC engines - Cylinders, pistons and rings.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with
4、a British Standard cannot confer immunityfrom legal obligations.BS ISO 6626-3:2008Reference numberISO 6626-3:2008(E)ISO 2008INTERNATIONAL STANDARD ISO6626-3First edition2008-06-15Internal combustion engines Piston rings Part 3: Coil-spring-loaded oil control rings made of steel Moteurs combustion in
5、terne Segments de piston Partie 3: Segments racleurs rgulateurs dhuile, en acier, mis en charge par ressort hlicodal BS ISO 6626-3:2008ISO 6626-3:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but sh
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10、09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 6626-3:2008ISO 6626-3:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Symbols . 1 4 Piston ring types and designation
11、 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 h1and radial wall thickness a1. 4 5.2 Land width h5. 5 5.3 Land angle , 5 5.4 Land spacing B36 5.5 Slot sizes . 6 5.6 Nitrided su
12、rface. 7 5.7 Nominal contact pressure and tangential force 7 5.8 Tolerance of tangential force Ft. 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 Type SOR. 11 8 Type SOV . 11 9 Dimensions 12
13、 Bibliography . 20 BS ISO 6626-3:2008ISO 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 International Standards is normally carried out t
14、hrough 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 with ISO, also take part in the work. ISO colla
15、borates 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 technical committees is to prepare International Sta
16、ndards. 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 the possibility that some of the elements o
17、f 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 the general title Internal combustion engines
18、 Piston rings: Coil-spring-loaded oil control rings1) 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 as the first part of the ISO 6626 series sinc
19、e publication of the other parts. BS ISO 6626-3:2008ISO 6626-3:2008(E) ISO 2008 All rights reserved vIntroduction ISO 6626 is one of a series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6621, ISO 6622, ISO 6623, ISO 6624, ISO 662
20、5 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 under which it will be required to operate. BS I
21、SO 6626-3:2008BS ISO 6626-3:2008INTERNATIONAL STANDARD ISO 6626-3:2008(E) ISO 2008 All rights reserved 1Internal combustion engines Piston rings Part 3: Coil-spring-loaded oil control rings made of steel 1 Scope This part of ISO 6626 specifies the essential dimensions of coil-spring-loaded, nitrided
22、 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 inclusive for reciprocating internal combustion
23、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 cited applies. For undated references, the latest
24、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 associated indices) are in accordance with the s
25、ymbols used in ISO 6621, ISO 6622, ISO 6623, ISO 6624, ISO 6625, ISO 6627 and other parts of ISO 6626. a1radial wall thickness a4groove depth a12radial thickness over coil spring a13groove depth and bridge a14external land depth B3land spacing c1slot width d1nominal diameter (nominal bore diameter)
26、d7coil-spring diameter BS ISO 6626-3:2008ISO 6626-3:2008(E) 2 ISO 2008 All rights reservedd14coil-spring groove diameter for type SOR f1coil-spring excursion Fttangential force h1ring width h5land width p0contact pressure s1closed gap w1slot length w3slot spacing land angle inside land angle outside
27、 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 ring type SOR. BS ISO 6626-3:2008ISO 6626-3:2008(E) ISO 2008 All rights
28、 reserved 3Dimensions 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 Designation EXAMPLE A coil-spring-loaded, nitrided oil control ring m
29、ade of steel with R-shaped groove (SOR), a radial wall thickness class = small (S), of nominal diameter d1= 100 mm (100), a nominal ring width h1= 3 mm (3), a land width h5= 0,20 mm (0,20), a nitrided depth of 0,030 mm min. (NT030), coil spring with reduced heat set (WF), and variable pitch with coi
30、l diameter d7ground (CSE), medium nominal contact pressure p0= 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 and dimensions Figure 2 shows the general features and dimensions of piston
31、ring type SOV. BS ISO 6626-3:2008ISO 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 plane Figure 2 General features and dimensions of piston ring type SOV 4.2.2 De
32、signation 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 d1= 100 mm (100), a nominal ring width h1= 3 mm (3), a land width h5= 0,20 mm (0,20), a nitrided
33、depth of 0,030 mm min. (NT030), coil spring with reduced heat set (WF), and constant pitch with coil diameter d7ground (CSN), medium nominal contact pressure p0= 1,5 MPa (PN1,5): Piston ring ISO 6626-3-SOV-S-V40-100 x 3 x 0,20 NT030 WF CSN PN1,5 5 Common features 5.1 Ring width h1and radial wall thi
34、ckness a1Table 1 shows common features for ring width h1and radial wall thickness a1. BS ISO 6626-3:2008ISO 6626-3:2008(E) ISO 2008 All rights reserved 5Table 1 Ring width h1and radial wall thickness a1Dimensions in millimetres Radial wall thickness 10,15a Ring width 0,0110,03h= Small (Code: S) Larg
35、e (Code: L) Type 2,0 1,8 to 2,0 SOR 2,5 1,8 to 2,0 SOR3,0 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 h5Table 2 shows common features for land width h5. Table 2 Land width h5Dimensions in millimetres Ring width h1Land width 50,07h 2,0 0,20 2,5 0,20 0,25 3,0
36、 0,20 0,25 0,30 4,0 0,20 a0,25 0,30 aFor 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 features for land angle , . Table 3 Land angle , Land angle Range of nominal angle Tolerance inside 5 to 20 a 5 o
37、utside 10 to 30 a 5 aNominal angle subject to agreement between manufacturer and client.BS ISO 6626-3:2008ISO 6626-3:2008(E) 6 ISO 2008 All rights reserved5.4 Land spacing B3Table 4 shows common features for land spacing B3. Table 4 Land spacing B3Dimensions in millimetres Ring width h1Land spacing
38、B3a2,0 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()310, 95Bc+ 5.5 Slot sizes Table 5 shows common features for slot sizes. Table 5 Standard slot sizes Dimensions in millimetres Ring width h1Slot width c1Slot length w1Slot spacing w32,0 0,3 to 0,5 1,4 to 2,5 5 to 10 2,5 0,4 to
39、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 ISO 6626-3:2008ISO 6626-3:2008(E) ISO 2008 All rights reserved 75.6 Nitrided surface Table 6 shows common features for nitride
40、d surfaces. Table 6 Nitrided case depth of peripheral surface and sideface Dimensions in millimetres Nitrided case depthaCode Peripheral surface min. Sideface min. NT010 0,010 0,005 NT030 0,030 0,010 NT050 0,050 0,015 aFor tolerances, see ISO 6621-4.5.7 Nominal contact pressure and tangential force
41、Table 7 shows common features for nominal contact pressure. Table 7 Nominal contact pressure classes Dimensions in millimetres Nominal contact pressure p0MPa Ring width h1Code 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 tang
42、ential force FtTable 8 shows common features for tangential force Ft, where t150F dhp= (1) Table 8 Tolerance of tangential force FtTangential force N Tolerance Ft 20 4 N FtW 20 20 % BS ISO 6626-3:2008ISO 6626-3:2008(E) 8 ISO 2008 All rights reserved6 Coil springs 6.1 Types of coil spring 6.1.1 All v
43、alues 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 illustrates 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 illus
44、trates the design of type CSG coil spring with constant pitch (coil diameter d7ground). Key 1 diameter of wire aApproximately 0,8 diameter of wire. Figure 5 Type CSG coil spring 6.1.4 Figure 6 illustrates the design of type CSE coil spring with variable pitch (coil diameter d7ground), and Figure 7 s
45、hows the position of the area with small pitch. BS ISO 6626-3:2008ISO 6626-3:2008(E) ISO 2008 All rights reserved 9Key 1 diameter of wire aApproximately 0,8 diameter of wire. Figure 6 Type CSE coil spring Dimensions in millimetres Key 1 spring gap 2 area with small pitch aLatch pin free length. bLat
46、ch 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 spring groove configurations and dimensions can then be necessary. BS ISO 6626-3:2008ISO 6626-3:2008(E) 10 ISO 2008 All rights reserved6.2 C
47、oil-spring excursion (extended gap) Coil-spring excursion, f1, is the distance between the ends of the ring gap, with unstressed ring, measured in the middle of the spring groove (see Figure 8 and Table 9). Figure 8 Coil-spring excursion Table 9 Coil-spring excursion Dimensions in millimetres Nomina
48、l diameter d1Coil-spring excursion f1max. 60 u d1 100 0,1 d1100 u d1u 200 0,12 d16.3 Position of coil spring gap and fixing The spring gap shall be approximately 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 sho
49、wn 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): standard heat resistance; reduced heat set, code WF. The test conditions and the permissible loss of tangential forces are given in ISO 6621-5:2005, T
