ISO 6626-2:2013
(Main)Internal combustion engines — Piston rings — Part 2: Coil-spring-loaded oil control rings of narrow width made of cast iron
Internal combustion engines — Piston rings — Part 2: Coil-spring-loaded oil control rings of narrow width made of cast iron
ISO 6626-2:2013 specifies the essential dimensional features of coil-spring-loaded oil control rings made of cast iron, types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP. It is applicable to those piston rings in sizes 60 mm to 110 mm, inclusive, for reciprocating internal combustion engines for road vehicles and other applications.
Moteurs à combustion interne — Segments de piston — Partie 2: Segments racleurs régulateurs d'huile étroits, en fonte, mis en charge par ressort hélicoïdal
General Information
Relations
Buy Standard
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6626-2
Second edition
2013-08-01
Internal combustion engines —
Piston rings —
Part 2:
Coil-spring-loaded oil control rings of
narrow width made of cast iron
Moteurs à combustion interne — Segments de piston —
Partie 2: Segments racleurs régulateurs d’huile étroits, en fonte, mis
en charge par ressort hélicoïdal
Reference number
©
ISO 2013
© 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
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Overview . 1
4 Piston ring types and designation . 2
4.1 DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP types . 2
4.2 Type DSF-C — Coil-spring-loaded bevelled edge oil control ring, chromium-plated, and
profile ground . 2
4.3 Type DSF-CNP — Coil-spring-loaded bevelled-edge oil control ring, chromium-plated not
profile ground . 3
4.4 Type SSF — Coil-spring-loaded slotted oil control ring . 4
4.5 Type GSF — Coil-spring-loaded double bevelled oil control ring . 5
4.6 Type DSF — Coil-spring-loaded bevelled edge oil control ring . 6
4.7 Type DSF-NG — Coil-spring-loaded bevelled-edge oil control ring (face geometry similar
to type DSF-C) . 7
4.8 Type SSF-L — Coil-spring-loaded slotted oil control ring with 0,4 mm nominal
land width . 8
5 Common features . 9
5.1 Oil drainage by slots or holes . 9
5.2 Plating thickness — DSF-C and DSF-CNP (coil-spring-loaded bevelled edge oil control
ring, chromium plated) .11
5.3 Peripheral edges at gap of chromium plated oil control rings.12
6 Coil springs .12
6.1 Types of coil spring .12
6.2 Coil spring excursion (extended gap) .14
6.3 Position of coil spring gap and fixing .14
6.4 Material .14
7 Tangential force and nominal contact pressure .14
7.1 Tangential force .14
7.2 Force factors .14
7.3 Tangential force, F .
t 15
7.4 Classes of nominal contact pressure, p .
o 15
8 Dimensions and tangential forces .17
Bibliography .36
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 6626-2:2003), which has been
technically revised.
ISO 6626 consists of the following parts, under the general title Internal combustion engines — Piston rings:
— 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
ISO 6626:1989 (Internal combustion engines — Piston rings — Coil-spring-loaded oil control rings) is to be
withdrawn and replaced with a part 1 (i.e. a revision) at a later date.
iv © ISO 2013 – All rights reserved
Introduction
ISO 6626 (all parts) is one of a series of International Standards dealing with piston rings for reciprocating
[2] [3]
internal combustion engines. The others are ISO 6621 (all parts), ISO 6622 (all parts), ISO 6623,
[4] [5] [6]
ISO 6624 (all parts), ISO 6625 and ISO 6627.
INTERNATIONAL STANDARD ISO 6626-2:2013(E)
Internal combustion engines — Piston rings —
Part 2:
Coil-spring-loaded oil control rings of narrow width
made of cast iron
1 Scope
This part of ISO 6626 specifies the essential dimensional features of coil-spring-loaded oil control
rings made of cast iron, types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP. It is applicable to those
piston rings in sizes 60 mm to 110 mm, inclusive, for reciprocating internal combustion 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 to its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 6621-2, 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 6621-5, Internal combustion engines — Piston rings — Part 5: Quality requirements
3 Overview
The coil-spring-loaded oil control ring types are specified in Figures 1 to 8. Their common features and
the dimensions of the features are specified in Tables 1 and 2 and shown in Figures 9 to 11. Essential
features of coil-springs are shown in Figures 12 to 16. Table 3 specifies different classes of contact
pressure. Tables 4 to 9 give the dimensions and forces of coil-spring-loaded oil control rings.
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 shall 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 6621-3 and
ISO 6621-4 before completing a selection.
For the cast iron part, the recommended material is class 10 and shall be in accordance with ISO 6621-3.
For special applications, material classes 20 to 50 may be used.
Variation from these in face design and spring groove may be used, as recommended by individual
manufacturers, in plain or chromed versions.
4 Piston ring types and designation
4.1 DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP types
4.1.1 General features and dimensions
See Figure 1 and Tables 4, 5, 6, 7, 8 and 9.
Figure 1 — Types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP
4.2 Type DSF-C — Coil-spring-loaded bevelled edge oil control ring, chromium-plated,
and profile ground
4.2.1 General features and dimensions
See Figure 2 and Table 4.
2 © ISO 2013 – All rights reserved
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 2 — Type DSF-C
4.2.2 Designation of a type DSF-C piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded bevelled edge oil control ring, chromium plated and profile ground (DSF-C),
of nominal diameter d = 80 mm (80), nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat
1 1
treated, material subclass 11 (MC11), having a selected closed gap of 0,20 mm min. (S020), a chromium layer
thickness on the lands of 0,10 mm (CR2), reduced slot length (WK), a coil spring with reduced heat set (WF),
and a variable pitch with coil diameter d ground (CSE), with tangential force F in accordance with the medium
7 t
nominal contact pressure class (PNM) and the ring marked with the manufacturer’s mark (MM) is designated as
follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 DSF-C - 80 × 2,5 - MC11/S020 CR2 WK WF CSE PNM MM
4.3 Type DSF-CNP — Coil-spring-loaded bevelled-edge oil control ring, chromium-plat-
ed not profile ground
4.3.1 General features and dimensions
See Figure 3 and Tables 5.
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 3 — Type DSF-CNP
4.3.2 Designation of a type DSF-CNP piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded slotted oil control ring (DSF-CNP) of nominal diameter d = 100 mm (100),
nominal ring width h = 2,0 mm (2,0), made of grey cast iron, non-heat treated, material subclass 12 (MC12),
constant spring pitch (CSN) and tangential force F in accordance with the low
...
INTERNATIONAL ISO
STANDARD 6626-2
Second edition
2013-08-01
Internal combustion engines —
Piston rings —
Part 2:
Coil-spring-loaded oil control rings of
narrow width made of cast iron
Moteurs à combustion interne — Segments de piston —
Partie 2: Segments racleurs régulateurs d’huile étroits, en fonte, mis
en charge par ressort hélicoïdal
Reference number
©
ISO 2013
© 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
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Overview . 1
4 Piston ring types and designation . 2
4.1 DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP types . 2
4.2 Type DSF-C — Coil-spring-loaded bevelled edge oil control ring, chromium-plated, and
profile ground . 2
4.3 Type DSF-CNP — Coil-spring-loaded bevelled-edge oil control ring, chromium-plated not
profile ground . 3
4.4 Type SSF — Coil-spring-loaded slotted oil control ring . 4
4.5 Type GSF — Coil-spring-loaded double bevelled oil control ring . 5
4.6 Type DSF — Coil-spring-loaded bevelled edge oil control ring . 6
4.7 Type DSF-NG — Coil-spring-loaded bevelled-edge oil control ring (face geometry similar
to type DSF-C) . 7
4.8 Type SSF-L — Coil-spring-loaded slotted oil control ring with 0,4 mm nominal
land width . 8
5 Common features . 9
5.1 Oil drainage by slots or holes . 9
5.2 Plating thickness — DSF-C and DSF-CNP (coil-spring-loaded bevelled edge oil control
ring, chromium plated) .11
5.3 Peripheral edges at gap of chromium plated oil control rings.12
6 Coil springs .12
6.1 Types of coil spring .12
6.2 Coil spring excursion (extended gap) .14
6.3 Position of coil spring gap and fixing .14
6.4 Material .14
7 Tangential force and nominal contact pressure .14
7.1 Tangential force .14
7.2 Force factors .14
7.3 Tangential force, F .
t 15
7.4 Classes of nominal contact pressure, p .
o 15
8 Dimensions and tangential forces .17
Bibliography .36
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 6626-2:2003), which has been
technically revised.
ISO 6626 consists of the following parts, under the general title Internal combustion engines — Piston rings:
— 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
ISO 6626:1989 (Internal combustion engines — Piston rings — Coil-spring-loaded oil control rings) is to be
withdrawn and replaced with a part 1 (i.e. a revision) at a later date.
iv © ISO 2013 – All rights reserved
Introduction
ISO 6626 (all parts) is one of a series of International Standards dealing with piston rings for reciprocating
[2] [3]
internal combustion engines. The others are ISO 6621 (all parts), ISO 6622 (all parts), ISO 6623,
[4] [5] [6]
ISO 6624 (all parts), ISO 6625 and ISO 6627.
INTERNATIONAL STANDARD ISO 6626-2:2013(E)
Internal combustion engines — Piston rings —
Part 2:
Coil-spring-loaded oil control rings of narrow width
made of cast iron
1 Scope
This part of ISO 6626 specifies the essential dimensional features of coil-spring-loaded oil control
rings made of cast iron, types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP. It is applicable to those
piston rings in sizes 60 mm to 110 mm, inclusive, for reciprocating internal combustion 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 to its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 6621-2, 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 6621-5, Internal combustion engines — Piston rings — Part 5: Quality requirements
3 Overview
The coil-spring-loaded oil control ring types are specified in Figures 1 to 8. Their common features and
the dimensions of the features are specified in Tables 1 and 2 and shown in Figures 9 to 11. Essential
features of coil-springs are shown in Figures 12 to 16. Table 3 specifies different classes of contact
pressure. Tables 4 to 9 give the dimensions and forces of coil-spring-loaded oil control rings.
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 shall 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 6621-3 and
ISO 6621-4 before completing a selection.
For the cast iron part, the recommended material is class 10 and shall be in accordance with ISO 6621-3.
For special applications, material classes 20 to 50 may be used.
Variation from these in face design and spring groove may be used, as recommended by individual
manufacturers, in plain or chromed versions.
4 Piston ring types and designation
4.1 DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP types
4.1.1 General features and dimensions
See Figure 1 and Tables 4, 5, 6, 7, 8 and 9.
Figure 1 — Types DSF-C, SSF, GSF, DSF, SSF-L, DSF-NG and DSF-CNP
4.2 Type DSF-C — Coil-spring-loaded bevelled edge oil control ring, chromium-plated,
and profile ground
4.2.1 General features and dimensions
See Figure 2 and Table 4.
2 © ISO 2013 – All rights reserved
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 2 — Type DSF-C
4.2.2 Designation of a type DSF-C piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded bevelled edge oil control ring, chromium plated and profile ground (DSF-C),
of nominal diameter d = 80 mm (80), nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat
1 1
treated, material subclass 11 (MC11), having a selected closed gap of 0,20 mm min. (S020), a chromium layer
thickness on the lands of 0,10 mm (CR2), reduced slot length (WK), a coil spring with reduced heat set (WF),
and a variable pitch with coil diameter d ground (CSE), with tangential force F in accordance with the medium
7 t
nominal contact pressure class (PNM) and the ring marked with the manufacturer’s mark (MM) is designated as
follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 DSF-C - 80 × 2,5 - MC11/S020 CR2 WK WF CSE PNM MM
4.3 Type DSF-CNP — Coil-spring-loaded bevelled-edge oil control ring, chromium-plat-
ed not profile ground
4.3.1 General features and dimensions
See Figure 3 and Tables 5.
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 3 — Type DSF-CNP
4.3.2 Designation of a type DSF-CNP piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded slotted oil control ring (DSF-CNP) of nominal diameter d = 100 mm (100),
nominal ring width h = 2,0 mm (2,0), made of grey cast iron, non-heat treated, material subclass 12 (MC12),
constant spring pitch (CSN) and tangential force F in accordance with the low
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.