ISO 6621-2-2003 Internal combustion engines - Piston rings - Part 2 Inspection measuring principles《内燃机 活塞环 第2部分 检验测量规则》.pdf
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1、 Reference number ISO 6621-2:2003(E) ISO 2003INTERNATIONAL STANDARD ISO 6621-2 Second edition 2003-11-15 Internal combustion engines Piston rings Part 2: Inspection measuring principles Moteurs combustion interne Segments de piston Partie 2: Principes de mesure pour inspection ISO 6621-2:2003(E) PDF
2、 disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, par
3、ties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative
4、 to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that 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. ISO 2003
5、All rights 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 countr
6、y of 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 Switzerland ii ISO 2003 All rights reservedISO 6621-2:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv Introdu
7、ction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Measuring principles 1 4.1 General measuring conditions 1 4.2 Ring characteristics and their measurement. 2 4.2.1 Ring width(in millimetres) 2 4.2.2 Radial wall thickness, a 1(in millimetres) 4 4.2.3 Total free gap m, p(in mil
8、limetres) . 5 4.2.4 Closed gap, s 1(in millimetres) 6 4.2.5 Tangential force, F t(in newtons). 7 4.2.6 Diametral force, F d(in newtons) 13 4.2.7 Ovality, U (in millimetres) . 13 4.2.8 Point deflection, W (in millimetres) 14 4.2.9 Light tightness (percentage of ring circumference) 14 4.2.10 Taper on
9、peripheral surface (in micrometres or degrees) . 15 4.2.11 Barrel on peripheral surface, t 2 , t 3(in millimetres) 16 4.2.12 Land width, h 4 , h 5(in millimetres) 18 4.2.13 Land offset (in millimetres) 18 4.2.14 Plating/coating thickness (in millimetres) 19 4.2.15 Nitrided case depth (in millimetres
10、) 20 4.2.16 Keystone angle (in degrees) . 21 4.2.17 Obliqueness (in degrees) 24 4.2.18 Twist (in millimetres). 24 4.2.19 Unevenness T er , T eu25 4.2.20 Helix (axial displacement of gap ends) (in millimetres) 27 4.2.21 Free flatness (in millimetres) 27 4.2.22 Surface roughness Ra, Rz (in micrometres
11、) 28 Bibliography . 29 ISO 6621-2:2003(E) iv ISO 2003 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 through ISO tec
12、hnical 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 collaborates closel
13、y 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 Standards. Draft
14、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 of this documen
15、t may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6621-2 was prepared by Technical Committee ISO/TC 22, Road vehicles. This second edition cancels and replaces the first edition (ISO 6621-2:1984), which has been technically re
16、vised. 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: Material specifications Part 4: General specifications Part 5: Quality requirements ISO 6621-2:2003(E) ISO 2003 All ri
17、ghts reserved vIntroduction ISO 6621 is one of a series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6622 4, 5 , ISO 6623 6 , ISO 6624 7, 8, 9, 10 , ISO 6625 11 , ISO 6626 12, 13and ISO 662714 . The common features and dimensional
18、 tables presented in this part of ISO 6621 constitute a broad range of variables, and the designer selecting a particular ring type must bear in mind the conditions under which it will be required to operate. It is also essential that the designer refer to the specifications and requirements of ISO
19、6621-3 and ISO 6621-4 before completing a selection. INTERNATIONAL STANDARD ISO 6621-2:2003(E) ISO 2003 All rights reserved 1Internal combustion engines Piston rings Part 2: Inspection measuring principles 1 Scope This part of ISO 6621 specifies the principles to be used in the measuring for inspect
20、ion purposes of piston rings for both reciprocating internal combustion engines and compressors working under analogous conditions. It is applicable to all such rings of a diameter u 200 mm. 2 Normative references The following referenced documents are indispensable for the application of this docum
21、ent. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4287-1:1984, Surface roughness Terminology Part 1: Surface and its parameters ISO 4287:1997, Geometrical Product Specifications (GP
22、S) Surface texture: Profile method Terms, definitions and surface texture parameters 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 3 Terms and definitions For the purposes of this d
23、ocument, the terms and definitions given in ISO 6621-1 and in 4.2 apply. 4 Measuring principles 4.1 General measuring conditions The following general conditions are applicable to all measuring principles, unless otherwise specified. a) The ring shall rest on the reference plane in the free or open
24、condition. No additional force shall be applied to load the ring on the reference plane, except when measuring unevenness in accordance with 4.2.19 or helix in accordance with 4.2.20. b) Certain measurements are made with the ring in the closed condition in a gauge of nominal cylinder bore diameter.
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