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1、Reference number ISO 6627:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 6627 First edition 2000-09-15 Internal combustion engines Piston rings Expander/segment oil-control rings Moteurs combustion interne Segments de piston Segments racleurs rgulateurs dhuile/expandeurs ISO 6627:2000(E) PDF disclaimer
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5、reserved. Unless otherwise specified, no part of this publication may 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 re
6、quester. 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.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reserved ISO 6627:2000(E) ISO 2000 All rights reservediii ContentsPage Foreword.iv Introduction.v 1Scope
7、1 2Normative references1 3Symbols and abbreviated terms 2 4Ring types and designations3 5Common features 5 6Dimensions.9 7Materials .11 8Tangential force and nominal contact pressure.11 Bibliography13 ISO 6627:2000(E) iv ISO 2000 All rights reserved Foreword ISO (the International Organization for S
8、tandardization) 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 ri
9、ght 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 electrotechnical standardization. Internationa
10、l Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 bo
11、dies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 6627 was prepared by Technical Committe
12、e ISO/TC 22, Road vehicles. ISO 6627:2000(E) ISO 2000 All rights reservedv Introduction ISO 6627 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 6625 and ISO 6626 (see clause
13、 2 and the bibliography). The common features and dimensional tables included in ISO 6627 represent a broad range of variables. In selecting a ring type, the designer will above all need to consider the particular operating conditions. Moreover, it is essential that the designer refer to the specifi
14、cations and requirements of ISO 6621-3 and ISO 6621-4 before completing the selection. INTERNATIONAL STANDARDISO 6627:2000(E) ISO 2000 All rights reserved1 Internal combustion engines Piston rings Expander/segment oil-control rings 1Scope This International Standard specifies the essential dimension
15、al features of expander/segment oil-control rings, without providing a complete product description (because expander-spacer design varies from piston-ring manufacturer to piston-ring manufacturer, the interaction between the manufacturer and the client will determine specific design details). This
16、International Standard applies to expander/segment oil-control rings of nominal diameters ranging from 40 mm to 125 mm for reciprocating internal combustion engines. It also applies to piston rings for compressors working under analogous conditions. 2Normative references The following normative docu
17、ments contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encou
18、raged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 66
19、21-2, Internal combustion engines Piston rings Part 2: Inspection measuring principles. ISO 6621-3, Internal combustion engines Piston rings Part 3: Material specifications. ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications. ISO 6626, Internal combustion engines Pis
20、ton rings Coil-spring-loaded oil control rings. ISO 6627:2000(E) 2 ISO 2000 All rights reserved 3Symbols and abbreviated terms For the purposes of this International Standard, the symbols and abbreviated terms in Table 1 apply. Table 1 Symbols and abbreviations Symbol Abbreviation Description a1 Seg
21、ment radial wall thickness a8 Spacer radial thickness a9 Expander radial thickness a11 Assembly radial thickness a14 Seating tab height d1 Nominal ring assembly diameter (nominal diameter) h1 Nominal assembly width h9 Expander width h10 Segment width near inside diameter (ID), after coiling h11 Segm
22、ent width near outside diameter (OD), after coiling and surface treatment or plating h12 Nominal segment width h13 Spacer width po Nominal contact pressure pou Unit contact pressure s1 Segment closed gap; stagger gap Ft Tangential force Ftc Specific tangential force ?Nominal seating tab angle CR1.CR
23、3Chromium-plating thickness ES1.ES4Types of expander/segment oil-control rings PNHHigh nominal pressure PNLLow nominal pressure PNMMedium nominal pressure PNRReduced nominal pressure PNVVery high nominal pressure NS010-NS050Nitrided surface (segment) NXNitrided surface (expander-spacer) ISO 6627:200
24、0(E) ISO 2000 All rights reserved3 4Ring types and designations 4.1Types of expander/segment oil-control rings The more common designs (expander-spacers, segments and corresponding assemblies) in general use are shown in Figure 1. NOTEThe designations of design types ES3 and ES4 are different to the
25、 designations for those types given in ISO/TR 6627:1992. ES1 ES2 ES3 ES4 Key 1Centring pad (optional) Figure 1 Expander/segment oil-control ring designs ISO 6627:2000(E) 4 ISO 2000 All rights reserved 4.2General features The expander/segment assembly shall be in accordance with Figure 2. a) Assembly
26、 b) Expander-spacerc) Segmentd) Section A-A Key 1Seating tab 2Expander-spacer ends 3Peripheral surface 4Stagger segments gaps and expander ends (all three components)a, b a Stagger angle should be larger than 30. b For assembly arrangement regarding tangential force, see ISO 6621-2. c Seating tab an
27、gle dimensions are defined in Table 2. Figure 2 Expander/segment assembly ISO 6627:2000(E) ISO 2000 All rights reserved5 4.3Designation examples The following are examples of piston ring designations in accordance with this International Standard. EXAMPLE 1Expander/segment oil-control ring type ES1
28、(ES1) of nominal diameter d1= 90 mm (90) and nominal assembly width h1= 3 mm (3), with segments made of unalloyed steel subclass 68 (MC68), a chromium-plated peripheral surface of minimum thickness 0,05 mm (CR1), and with an expander made of 16 % Cr (min.) austenitic steel, of material subclass 67 (
29、MC67) and tangential force, Ft, according to the medium nominal contact pressure class (PNM): Piston ring ISO 6627 ES1-90 3-MC68/CR1-MC67/PNM EXAMPLE 2Expander/segment oil-control ring type ES2 (ES2) of nominal diameter d1= 90 mm (90) and nominal assembly width h1= 2,5 mm (2,5), with segments made o
30、f 11 % Cr (min.) martensitic steel, subclass 65 (MC65), nitrided on the peripheral and inside surfaces (NS020) to a minimum depth of 0,020 mm on the peripheral surface, and with an expander made of 16 % Cr (min.) austenitic steel, of material subclass 67 (MC67), nitrided on the surface (NX), and tan
31、gential force, Ft, according to the reduced nominal contact pressure class (PNR): Piston ring ISO 6627 ES2-90 2,5-MC65/NS020-MC67/NXPNR 5Common features 5.1Expander-spacer 5.1.1Design considerations In order to optimize the fit of the oil ring assembly into the engine cylinder bore, the following sh
32、ould be considered in the design of the expander/segment oil-control rings: ?total circumferential deflection of the expander; ?piston groove depth; ?features on the lands adjacent to the oil ring groove; ?groove-corner radius. 5.1.2Without surface treatment The expander-spacer lacking surface treat
33、ment is typically used together with chromium-plated segments (see 5.2.1). 5.1.3Nitrided surface (NX) The expander-spacer with a nitrided surface is typically used together with nitrided segments (see 5.2.2). In respect of the nitriding case depth of nitrided expander-spacers, the minimum case depth
34、 shall be 0,003 mm, while the appropriate tolerance is 0,012 0 ? mm. NOTE 1The specification for NX applies at all areas of contact between the expander-spacer and the segments. NOTE 2For the definition of nitriding case depth, see ISO 6621-2. ISO 6627:2000(E) 6 ISO 2000 All rights reserved 5.1.4Sea
35、ting tab angle The expander-spacer is usually designed with the seating tabs at a slight angle. This results in side sealing between the segment and the side of the piston groove (see Figure 3). Key 1Reference plane Figure 3 Expander-spacer seating tab angle The nominal seating angle shown in Figure
36、 3 is defined as the minimum angle. The value of the nominal seating angle will depend on the expander-spacer design. The lowest nominal seating angle is 0?for expander-spacer type ES2. All other expander-spacer types shall have a nominal seating angleW5?(see Table 2). Table 2 Seating tab angle Valu
37、es in degrees Seating tab angle Type ?Tolerance ES1, ES3, ES4 W 5 10 0 ? ES2 W 0 8 0 ? 5.1.5Expander-spacer dimensions No values are given for features a8, a9, a14, h9and h13(see Figure 2), as these dimensions depend on the expander-spacer design and shall be defined by the manufacturer. 5.2Segment
38、features 5.2.1Chromium-plated peripheral surface The common features of a chromium-plated segment are shown in Figure 4, with chromium-plating thicknesses given in Table 3. Figure 4 Chromium-plated segment ISO 6627:2000(E) ISO 2000 All rights reserved7 Table 3 Chromium-plating thicknesses Code Thick
39、ness min. mm CR10,05 CR20,10 CR30,15 5.2.2Nitrided surface codes NS010 to NS050 The common features of a nitrided segment are shown in Figure 5. The nitriding case depth (NS010 to NS050) is specified according to its reference to the peripheral surface, inside surface or the sides of the segment (se
40、e Table 4). Figure 5 Nitrided segment Table 4 Nitrided case depth Dimensions in millimetres Nitrided case deptha Code Peripheral surface min. Inside surface min. Side faces NS0100,0100,005 NS0200,0200,005 NS0300,0300,010 NS0500,0500,020 nitrided surface permissible a For tolerances, see ISO 6621-4.
41、ISO 6627:2000(E) 8 ISO 2000 All rights reserved 5.2.3Segment dimensions The nominal segment width (h12) is defined as the width at the mid-point of the segment radial-wall thickness. The segment width defined near the internal diameter of the segment (h10) and the outside diameter (h11) is shown in
42、Figure 6, while typical values are given in Table 5. Figure 6 Segment width Table 5 Segment width Dimensions in millimetres Plated segment widthNitrided segment width Segment width max.max. h12h10h11h10h11 0,40,440,460,470,45 0,450,490,510,520,5 0,50,540,560,570,55 0,60,640,660,670,65 The radial wal
43、l thickness of the segment will vary in accordance with the expander-spacer design. Common ratios d1/a1are between 40 and 20, approximately. The common tolerance for the radial wall thickness (a1) of the nitrided segments, and the chromium-plated segments CR1 and CR2, is ? 0,08 mm; it is ? 0,12 mm f
44、or CR3. 5.3Expander/segment assembly The nominal expander/segment assembly width (h1) is shown in Table 6 with the specific tangential force (Ftc). The radial thickness of the selected assembly (a11) depends on its design (expander and segments) and shall be defined by the manufacturer. ISO 6627:200
45、0(E) ISO 2000 All rights reserved9 6Dimensions Table 6 Dimensions of expander/segment oil-control rings Dimensions in millimetres Nominal diameter d1 Segment width h12 (Column) Segment closed gap s1 Specific tangential force FtcN (?ou= 1 N/mm2) (Column) Nominal assembly width h1(using available h12)
46、 (Column) 1234Tolerance1234Tolerance1-31-31-41-44 4016,018,020,0 4116,418,420,5 4216,818,921,0 4317,219,321,5 4417,619,822,0 4518,020,222,5 4618,420,723,0 4718,821,123,5 4819,221,624,0 4919,622,024,5 5020,022,525,0 5120,422,925,5 5220,823,426,0 5321,223,826,5 5421,624,327,0 5522,024,727,5 5622,425,2
47、28,0 5722,825,628,5 5823,226,129,0 59 0,15 0,50 0 ? 23,626,529,5 6024,027,030,036,0 6124,427,430,536,6 6224,827,931,037,2 6325,228,331,537,8 6425,628,832,038,4 6526,029,232,539,0 6626,429,733,039,6 6726,830,133,540,2 6827,230,634,040,8 6927,631,034,541,4 7028,031,535,042,0 7128,431,935,542,6 7228,83
48、2,436,043,2 7329,232,836,543,8 74 0,20 29,633,337,044,4 7530,033,737,545,0 7630,434,238,045,6 7730,834,638,546,2 7831,235,139,046,8 7931,635,539,547,4 8032,036,040,048,0 8132,436,440,548,6 8232,836,941,049,2 8333,237,341,549,8 8433,637,842,050,4 8534,038,242,551,0 8634,438,743,051,6 8734,839,143,552
49、,2 8835,239,644,052,8 89 0,400,450,500,60 0,25 0,75 0 ? 35,640,044,553,4 ?30 % if Ftc 30 N ?20 % if Ftcu30 N 2,53,03,5 4,04,75 ISO 6627:2000(E) 10 ISO 2000 All rights reserved Table 6 (continued) Nominal diameter d1 Segment width h12 (Column) Segment closed gap s1 Specific tangential force FtcN (?ou= 1 N/mm2) (Column) Nominal assembly width h1(using available h12) (Column) 1234Tolerance1234Tolerance1-31-31-41-44 9036,040,545,054,0 9136,440,945,554,6 9236,841,446,055,2 933