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
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 6626-2:2013(E)
©
ISO 2013
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ISO 6626-2:2013(E)
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ii © ISO 2013 – All rights reserved
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ISO 6626-2:2013(E)
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
© ISO 2013 – All rights reserved iii
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ISO 6626-2:2013(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 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
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ISO 6626-2:2013(E)
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.
© ISO 2013 – All rights reserved v
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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.
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ISO 6626-2:2013(E)
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.
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ISO 6626-2:2013(E)
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.
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ISO 6626-2:2013(E)
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),
1
nominal ring width h = 2,0 mm (2,0), made of grey cast iron, non-heat treated, material subclass 12 (MC12),
1
constant spring pitch (CSN) and tangential force F in accordance with the low nominal contact pressure class
t
(PNL) is designated as follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 DSF-CNP 100 × 2 - MC12/CSN PNL
4.4 Type SSF — Coil-spring-loaded slotted oil control ring
4.4.1 General features and dimensions
See Figure 4 and Table 6.
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ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 4 — Type SSF
4.4.2 Designation of a type SSF piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded slotted oil control ring (SSF) of nominal diameter d = 80 mm (80), nominal
1
ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), constant
1
spring pitch (CSN) and tangential force F in accordance with the low nominal contact pressure class (PNL) is
t
designated as follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 SSF- 80 × 2,5 - MC12/CSN PNL
4.5 Type GSF — Coil-spring-loaded double bevelled oil control ring
4.5.1 General features and dimensions
See Figure 5 and Table 7. Top-side marking is mandatory in accordance with ISO 6621-4.
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ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
2 top side identification mark
a
In accordance with ISO 6621-2, land offset
Figure 5 — Type GSF
4.5.2 Designation of a type GSF piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded double bevelled oil control ring (GSF) of nominal diameter d = 75 mm (75),
1
nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), with
1
constant spring pitch (CSN) and tangential force F in accordance with the low nominal contact pressure class
t
(PNL) is designated as follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 GSF- 75 × 2,5 - MC12/CSN PNL
4.6 Type DSF — Coil-spring-loaded bevelled edge oil control ring
4.6.1 General features and dimensions
See Figure 6 and Table 7.
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ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 6 — Type DSF
4.6.2 Designation of a type DSF piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded double bevelled oil control ring (DSF) of nominal diameter d = 90 mm (90),
1
nominal ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), with
1
constant spring pitch (CSN) and tangential force F in accordance with the reduced nominal contact pressure class
t
(PNR) is designated as follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 DSF- 90 × 2,5 - MC12/CSN PNR
4.7 Type DSF-NG — Coil-spring-loaded bevelled-edge oil control ring (face geometry
similar to type DSF-C)
4.7.1 General features and dimensions
See Figure 7 and Table 8.
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ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 7 — Type DSF-NG
4.7.2 Designation of a type DSF-NG piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded slotted oil control ring (DSF-NG) of nominal diameter d = 80 mm (80),
1
nominal ring width h = 2,0 mm (2,0), made of grey cast iron, non-heat treated, material subclass 12 (MC12),
1
constant spring pitch (CSN) and tangential force F in accordance with the reduced nominal contact pressure class
t
(PNR) is designated as follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 DSF-NG - 80 × 2,0 - MC12/CSN PNR
4.8 Type SSF-L — Coil-spring-loaded slotted oil control ring with 0,4 mm nominal land
width
4.8.1 General features and dimensions
See Figure 8 and Table 9.
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ISO 6626-2:2013(E)
Dimensions in millimetres
Key
1 reference plane
a
In accordance with ISO 6621-2, land offset
Figure 8 — Type SSF-L
4.8.2 Designation of a type SSF-L piston ring in accordance with this part of ISO 6626
EXAMPLE A coil-spring-loaded slotted oil control ring (SSF-L) of nominal diameter d = 80 mm (80), nominal
1
ring width h = 2,5 mm (2,5), made of grey cast iron, non-heat treated, material subclass 12 (MC12), constant
1
spring pitch (CSN) and tangential force F in accordance with the reduced nominal contact pressure class (PNR) is
t
designated as follows. Parameters in parentheses are used in the ISO ring designation:
Piston ring ISO 6626-2 SSF-L - 80 × 2,5 - MC12/CSN PNR
5 Common features
5.1 Oil drainage by slots or holes
5.1.1 Arrangement of slots
5.1.1.1 General
Figure 9 shows the arrangement of oil drainage slots.
5.1.1.2 Slot length
5.1.1.3 Standard slot length
Slot length, w , shall be equal to bridge length, w .
1 2
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ISO 6626-2:2013(E)
The maximum difference between w and w shall be 4 mm.
1 2
5.1.1.4 Reduced slot length — Code WK
Oil control rings with reduced slot length will retain the same number of slots and the same angular
spacing. The maximum difference between w and w for the standard slot length does not apply.
1 2
See Table 1.
Dimensions in millimetres
a) 8 slots for 60 ≤ d < 80 b) 10 slots for 80 ≤ d ≤ 110
1 1
a
Cutter diameter
Figure 9 — Arrangement of slots
Table 1 — Reduced slot length
Dimensions in millimetres
d w (range of nominal
1 1
values)
60 ≤ d < 80 6 . 11
1
80 ≤ d < 110 8 . 13
1
5.1.2 Arrangement of holes
The arrangement of holes is shown in Figure 10. Deviating arrangements shall be agreed between the
manufacturer and customer.
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ISO 6626-2:2013(E)
Figure 10 — Arrangement of holes
5.1.2.1 Diameter and number of holes
The diameter, d , and number, n, of holes to be agreed between the manufacturer and customer.
15
5.2 Plating thickness — DSF-C and DSF-CNP (coil-spring-loaded bevelled edge oil con-
trol ring, chromium plated)
See Figure 11 and Table 2.
Figure 11 — Plating thickness
Table 2 — Plating thickness
Dimensions in millimetres
a
Code Thickness
min.
CR0 0,03
CR1 0,05
CR2 0,10
a
Plating thickness tolerances are given in ISO 6621-4.
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ISO 6626-2:2013(E)
5.3 Peripheral edges at gap of chromium plated oil control rings
For features and their dimensions, see ISO 6621-4.
6 Coil springs
6.1 Types of coil spring
All values in the dimensional tables of Clause 8 are based on cylindrical coil springs made of round wire.
The three designs shown in Figures 12 to 14 are common. The use of different spring designs may be
agreed between the manufacturer and client. Changed spring groove configurations and dimensions
could then be necessary.
Key
1 diameter of wire
Figure 12 — Type CSN coil spring with constant pitch
Key
1 diameter of wire
2 approximately 0,8 times the diameter of wire
Figure 13 — Type CSG coil spring with constant pitch (coil diameter, d , ground)
7
12 © ISO 2013 – All rights reserved
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ISO 6626-2:2013(E)
Key
1 diameter of wire
2 approximately 0,8 times the diameter of wire
Figure 14 — Type CSE coil spring with variable pitch (coil diameter, d , ground)
7
Dimensions in millimetres
Key
1 spring gap
2 area with small pitch
a
Latch pin free length
b
Latch pin fixed length
Figure 15 — Position of area with small pitch
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ISO 6626-2:2013(E)
6.2 Coil spring excursion (extended gap)
Coil spring excursion, f , is the distance between the ends of the ring gap, with unstressed ring, measured
1
in the middle of the spring groove (see Figure 16). The maximum value of f shall not exceed 0,13 d .
1 1
6.3 Position of coil spring gap and fixing
The spring gap shall be approximately 180° from the gap and the spring gap ends fixed with a connecting
or latch pin.
Figure 16 — Coil spring excursion
6.4 Material
Coil springs are made of valve spring wire, oil heat-treated. A suitable material for coil spring expanders
is subclass 62 and shall be in accordance with ISO 6621-3.
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.
Test conditions and the permissible loss of tangential forces shall be as specified in ISO 6621-5.
7 Tangential force and nominal contact pressure
7.1 Tangential force
The tangential force of coil-spring-loaded oil control rings is mainly determined by the force of the
spring. The cast iron part itself has a very small tangential force due to its low radial wall thickness and
the decreased ratio “total free gap/nominal diameter”.
The tangential force measurement only can be used because of the flexible design of the cast iron part
of the coil-spring-loaded oil control rings.
7.2 Force factors
Because of the small contribution of the cast iron part in the tangential force, force factors are not
necessary when additional features, materials or both (other than grey cast iron with modulus of
2
elasticity of 100 GN/m ) are being used.
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ISO 6626-2:2013(E)
7.3 Tangential force, F
t
7.3.1 General
The tangential force, F , of a spring-loaded oil control ring is determined by
t
a) nominal diameter, d , in millimetres,
1
b) land width, h , in millimetres, and
5
2
c) required nominal contact pressure, p , in newtons per square millimetre (N/mm ), calculated
o
using Formula (1):
1
Fd=⋅ ⋅⋅2 hp⋅ (1)
to15
2
The land width, h , depends on the ring type, nominal diameter and ring width. The nominal contact
5
pressure, p , can be selected over a wide range to suit the application and the required oil scraping effect.
o
7.3.2 Specific tangential force, F
tc
The specific tangential force, F , is that required to maintain a spring-loaded oil control ring at a unit
tc
2
contact pressure, p , of 1 N/mm using Formula (2):
ou
1
Fd=⋅ ⋅⋅2 hp⋅ (2)
tc 15 ou
2
In Clause 8, F is tabulated for every ring type.
tc
7.3.3 Actual tangential force, F , and tolerance
t
The actual tangential force of a spring-loaded oil control ring can be calculated with the F value and the
tc
required nominal contact pressure from using Formula (3):
pF⋅
otc
F = (3)
t
p
ou
The tolerance on F is the actual value F ± 20 %. Actual values of tangential force should be rounded up
t t
or down in accordance with ISO 6621-4.
7.4 Classes of nominal contact pressure, p
o
The nominal contact pressure, p , decreases with increasing nominal diameter, d . The correlation
o 1
between p and d for medium contact pressure (code PNM) is given by Formula (4):
o 1
pd=−0,,010⋅+25 (4)
01
The range of the nominal contact pressure has been subdivided into six classes. The nominal contact
pressure for all classes can be calculated by a factor in relation to PNM or by a formula, according to Table 3.
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ISO 6626-2:2013(E)
Table 3 — Classes of nominal contact pressure, p
o
Code Factor Formula Meaning
PNV 1,60 pd=−0,,0160⋅+4 000 Very high
1
0
pd=−0,,0125⋅+3125
PNH 1,25 High
1
0
PNM 1,00 pd=−0,,0100⋅+2 500 Medium
1
0
pd=−0,,0180⋅+2 000
PNR 0,80 Reduced
1
0
PNL 0,60 pd=−0,,0060⋅+1 500 Low
1
0
pd=−0,,0045⋅+1 125
PNE 0,45 Very low
1
0
Figure 17 shows characteristic values of p depending on d .
o 1
Figure 17 — Characteristic values of p depending on d
o 1
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ISO 6626-2:2013(E)
8 Dimensions and tangential forces
The dimensions and tangential force are shown in Tables 4 to 9. Land spacing B3 shall be agreed between
the manufacturer and customer.
The dimensions of Tables 4 to 9 are in millimetres.
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ISO 6626-2:2013(E)
Table 4 — Dimensions and tangential forces of DSF-C coil-spring-loaded oil control rings of
narrow ring width
Radial thickness
Ring width Radial wall thickness Land width
Closed
over coil spring
gap
h a h
1 1 5
a
12
d 1 2 1 2 Tol. 1 2 Tol. 1 2
1
60
61
62
63
64 0,20 2,15 2,20
65 +0,20
0
66
67
68
69
70 −0,010
−0,030
71
72 For
phos-
73
phated
PO
74 2,75 3,00 2,0 2,5 2,25 2,30 ±0,15 0,25 0,30
surface:
within a
75 0 0 ±0,07 ±0,07
ring
−0,005
−0,25 −0,25
0,15
76
−0,030
max.
77
78
79
80
81 0,25
82 +0,25
0
83
84 2,35 2,40
85
86
87
88
89
18 © ISO 2013 – All rights reserved
Nominal
diameter
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ISO 6626-2:2013(E)
Table 4 — (continued)
Coil spring Coil spring
Groove depth Tangential force
Groove depth
and bridge
groove diameter diameter a
N
a
4
a F
d d
13 tc
14 7
1 2 1 2 1 2 1 2 1 2
15,0 18,0
15,3 18,3
15,5 18,6
15,8 18,9
16,0 19,2
16,3 19,5
16,5 19,8
16,8 20,1
17,0 20,4
17,3 20,7
17,5 21,0
17,8 21,3
18,0 21,6
18,3 21,9
0,35 0,4 1,35 1,40 1,50 1,70 1,40 1,60 18,5 22,2
±0,10 ±0,10 0 0 +0,10 +0,10 0 0 18,8 22,5
−0,15 −0,15 0 0 -0,10 -0,10
19,0 22,8
19,3 23,1
19,5 23,4
19,8 23,7
20,0 24,0
20,3 24,3
20,5 24,6
20,8 24,9
21,0 25,2
21,3 25,5
21,5 25,8
21,8 26,1
22,0 26,4
22,3 26,7
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ISO 6626-2:2013(E)
Table 4 — (continued)
Radial thickness
Ring width Radial wall thickness Land width
Closed
over coil spring
gap
h a h
1 1 5
a
12
d
1 2 1 2 Tol. 1 2 Tol. 1 2
1
90
91
92
93
94 2,45 2,50
95
96
97
98 −0,01
−0,03
99
100 2,85 3,10 For 0,
...
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