Internal combustion engines -- Piston rings

ISO 6622-2:2013 specifies the essential dimensional features of rectangular rings made of steel, types R, B, BA, and M having nominal diameters from 30 mm up to and including 160 mm, used in reciprocating internal combustion piston engines for road vehicles and other applications.

Moteurs à combustion interne -- Segments de piston

General Information

Status
Published
Publication Date
27-Oct-2013
Current Stage
6060 - International Standard published
Start Date
13-Sep-2013
Completion Date
28-Oct-2013
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ISO 6622-2:2013 - Internal combustion engines -- Piston rings
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INTERNATIONAL ISO
STANDARD 6622-2
Second edition
2013-11-01
Internal combustion engines —
Piston rings —
Part 2:
Rectangular rings made of steel
Moteurs à combustion interne — Segments de piston —
Partie 2: Segments rectangulaires en acier
Reference number
ISO 6622-2:2013(E)
ISO 2013
---------------------- Page: 1 ----------------------
ISO 6622-2:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in 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 ISO’s member body in the country 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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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ISO 6622-2:2013(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Overview ....................................................................................................................................................................................................................... 1

4 Ring types and designation examples ............................................................................................................................................ 1

4.1 Type R — Straight-faced rectangular ring ...................................................................................................................... 1

4.2 Type B — Barrel-faced rectangular ring ........................................................................................................................... 2

4.3 Type BA — Asymmetrical barrel-faced rectangular ring, h ≥ 1,2mm ................................................... 4

4.4 Type M — Taper-faced rectangular ring ........................................................................................................................... 5

5 Common features ................................................................................................................................................................................................. 6

5.1 Type R — Straight-faced rectangular ring ...................................................................................................................... 6

5.2 Type B — Barrel-faced rectangular ring ........................................................................................................................... 7

5.3 Type BA — Asymmetrical barrel-faced rectangular ring, h ≥ 1,2 mm.................................................. 8

5.4 Type M — Taper-faced rectangular ring ........................................................................................................................... 9

5.5 Type R, B, BA, and M rings (positive twist type) — Internal bevel top side ......... ...........................11

5.6 Type M rings (negative twist type), taper M3 to M5 — Internal bevel bottom side ................11

5.7 Type R, B, BA, and M rings — Outside and inside rounded edges ...........................................................12

5.8 Type R, B, BA, and M rings (fully faced and inlaid) — Plating/coating thickness ......................12

5.9 Type R, B, BA, and M rings — Nitrided case depth ...............................................................................................13

6 Force factors ...........................................................................................................................................................................................................14

7 Dimensions and forces ................................................................................................................................................................................14

Bibliography .............................................................................................................................................................................................................................21

© ISO 2013 – All rights reserved iii
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ISO 6622-2:2013(E)
Foreword

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 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 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical 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 drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives

Attention 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. Details 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/patents

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.
The committee responsible for this document is ISO/TC 22, Road vehicles.

This second edition cancels and replaces the first edition (ISO 6622-2:2003), which has been

technically revised.

ISO 6622 consists of the following parts, under the general title Internal combustion engines — Piston rings:

— Part 1: Rectangular rings made of cast iron
— Part 2: Regular rings made of steel
iv © ISO 2013 – All rights reserved
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ISO 6622-2:2013(E)
Introduction

The ISO 6622 series is one of a number of series of International Standards dealing with piston

[2] [3] [4] [5] [6]

rings for reciprocating internal combustion engines. Others are ISO 6621, ISO 6623,

[7] [8] [9] [10] [12] [13] [14] [15]
ISO 6624, ISO 6625, ISO 6626, and ISO 6627 (see Bibliography for details).

The common features and dimensional tables presented in this part of ISO 6622 constitute a broad

range of variables and, in selecting a particular ring type, the designer must bear in mind the conditions

under which it will be required to operate.
[4]

It is also essential that the designer refer to the specifications and requirements of ISO 6621-3 and

[16]
ISO 6621-4 before completing his selection.
© ISO 2013 – All rights reserved v
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INTERNATIONAL STANDARD ISO 6622-2:2013(E)
Internal combustion engines — Piston rings —
Part 2:
Rectangular rings made of steel
1 Scope

This part of ISO 6622 specifies the essential dimensional features of rectangular rings made of steel,

types R, B, BA, and M having nominal diameters from 30 mm up to and including 160 mm, used in

reciprocating internal combustion piston engines for road vehicles and other applications.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

Not applicable.
3 Overview

The rectangular ring types are specified in Tables 1 to 5 and Figures 1 to 6. Their common features and

the dimensions of those features are specified in Tables 6 to 11 and Figures 7 to 22. Tables 12 and 13

give the force factors for the different ring types, while Table 13 gives the dimensions and forces of the

rectangular rings.
4 Ring types and designation examples
4.1 Type R — Straight-faced rectangular ring
4.1.1 General features
Figure 1 shows the general features of piston ring type R.
See Table 13 for dimensions and forces.
© ISO 2013 – All rights reserved 1
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ISO 6622-2:2013(E)
Key
1 reference plane
t = 0,005 × h .
Figure 1 — Type R
4.1.2 Designation

EXAMPLE Designation of a piston ring complying with the requirements of this part of ISO 6622 (i.e.

ISO 6622-2) being a steel, rectangular ring with a straight-faced peripheral surface (R), of nominal diameter

d = 60 mm (60), of nominal ring width h = 1,2 mm (1,2), made of CrSi alloyed steel, subclass 62 (MC62), and with

1 1

a chromium-plated peripheral surface of a minimum thickness 0,1 mm (CR2). Parameters in parenthesis are used

in the ISO ring designation:
Piston ring ISO 6622-2 R - 60 × 1,2 - MC62/CR2
4.2 Type B — Barrel-faced rectangular ring
4.2.1 General features
See Table 13 for dimensions and forces.
2 © ISO 2013 – All rights reserved
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ISO 6622-2:2013(E)
Key
1 reference plane
Figure 2 — Type B
Table 1 — Symmetrical barrel dimensions and gauge width (h )
Dimensions in millimetres
h h h h tol. h t , t h
1 25 26 26 27 2 3 8
0,8 0,20 0,40 ± 0,15 0,60 0,001...0,010 0,40
1,0 0,25 0,50 ± 0,15 0,75 0,001...0,011 0,50
1,2 0,30 0,60 ± 0,20 0,90 0,002...0,012 0,60
1,5 0,35 0,75 ± 0,25 1,15 0,80
1,75 0,35 0,85 ± 0,30 1,35 1,00
0,003...0,015
2,0 0,40 1,00 ± 0,30 1,60 1,20
2,5 0,45 1,25 ± 0,40 2,05 1,60
3,0 0,50 1,50 ± 0,50 2,50 2,00
0,005...0,020
3,5 0,55 1,75 ± 0,50 2,95 2,40

Gauge width (h ) only informative; may be used only if agreed between manufacturer and customer.

4.2.2 Designation

EXAMPLE Designation of a piston ring complying with the requirements of this part of ISO 6622 (i.e. ISO 6622-2)

being a steel, rectangular ring with a barrel-faced peripheral surface (B), of nominal diameter d = 60 mm (60),

of nominal ring width h = 1,5 mm (1,5), made of martensitic steel (17 % Cr), subclass 66 (MC66), nitrided on the

peripheral surface and side faces (NT), to a depth of 0,03 mm min. on the peripheral surface (030), and with an

associated side face depth of 0,010 mm min. Parameters in parenthesis are used in the ISO ring designation:

Piston ring ISO 6622-2 B - 60 × 1,5 - MC66/NT030
© ISO 2013 – All rights reserved 3
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ISO 6622-2:2013(E)
4.3 Type BA — Asymmetrical barrel-faced rectangular ring, h ≥ 1,2mm
4.3.1 General features
See Table 13 for dimensions and forces.
Key
1 referen
...

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