ISO 6622-2:2003
(Main)Internal combustion engines — Piston rings — Part 2: Rectangular rings made of steel
Internal combustion engines — Piston rings — Part 2: Rectangular rings made of steel
ISO 6622-2:2003 specifies the essential dimensional features of rectangular rings made of steel, types R, RB, BA and M, having diameters of from 30 mm up to and including 160 mm, used in reciprocating internal combustion piston engines. It is also applicable to piston rings of compressors working under similar conditions.
Moteurs à combustion interne — Segments de piston — Partie 2: Segments rectangulaires en acier
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6622-2
First edition
2003-10-01
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 6622-2:2003(E)
©
ISO 2003
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ISO 6622-2:2003(E)
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ii © ISO 2003 — All rights reserved
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ISO 6622-2:2003(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 W 1,5 mm . 4
1
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 W 1,5 mm . 8
1
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,
h W 1,5 mm. 11
1
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 . 13
5.9 Type R, B, BA and M rings — Nitrided case depth. 13
6 Force factors . 14
7 Dimensions. 14
Bibliography . 21
© ISO 2003 — All rights reserved iii
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ISO 6622-2:2003(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.
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 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6622-2 was prepared by Technical Committee ISO/TC 22, Road vehicles.
This first edition of ISO 6622-2 cancels and replaces ISO/TR 6622-2:1988, 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: Rectangular rings made of steel
iv © ISO 2003 — All rights reserved
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ISO 6622-2:2003(E)
Introduction
ISO 6622 is one of a number of series of International Standards dealing with piston rings for reciprocating
[2], [3], [4], [5] [6] [7], [8], [9], [10]
internal combustion engines. Others are ISO 6621 , ISO 6623 , ISO 6624 , ISO 6625,
[12], [13] [14]
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
ISO 6621-4 before completing his selection.
© ISO 2003 — All rights reserved v
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INTERNATIONAL STANDARD ISO 6622-2:2003(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 diameters of from 30 mm up to and including 160 mm, used in reciprocating internal
combustion piston engines. It is also applicable to piston rings of compressors working under similar
conditions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6621-4, Internal combustion engines — Piston rings — Part 4: General specifications����
3 Overview
The rectangular ring types are specified in Tables 1 to 3 and Figures 1 to 4. Their common features and the
dimensions of those features are specified in Tables 4 to 9 and Figures 5 to 22. Tables 10 and 11 give the
force factors for the different ring types, while Table 12 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
See Table 12 for dimensions and forces.
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ISO 6622-2:2003(E)
Key
1 reference plane
a
t = 0,005 × h .
1
Figure 1 — Type R
4.1.2 Designation
EXAMPLE Designation of a piston ring complying with the requirements of 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 1
(1,2), made of CrSi alloyed steel, subclass 62 (MC62), and with a chromium plated peripheral surface of a minimum
thickness 0,1 mm (CR2):
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 12 for dimensions and forces.
2 © ISO 2003 — All rights reserved
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ISO 6622-2:2003(E)
Key
1 reference plane
a
See Table 1.
Figure 2 — Type B
Table 1 — Gauge width (h ) and barrel dimensions for symmetrical barrel faced compression rings
8
Dimensions in millimetres
a
h h h h tol. h t , t
h
1 25 26 26 27 2 3
8
1,0 0,25 0,50 ± 0,15 0,75 0,50
0,003.0,012
1,2 0,30 0,60 0,90 0,60
± 0,20
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 2,05 1,60
± 0,40
3,0 0,50 1,50 2,50 2,00
± 0,50
0,005.0,020
3,5 0,55 1,75 ± 0,50 2,95 2,40
a
Gauge width (h ) only informative; may be used only if agreed between manufacturer and client.
8
4.2.2 Designation
EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-2 being a steel, rectangular
ring with barrel faced peripheral surface (B), of nominal diameter d = 60 mm (60), of nominal ring width h = 1,5 mm (1,5),
1 1
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.:
Piston ring ISO 6622-2 B - 60 ×××× 1,5 - MC66/NT030
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ISO 6622-2:2003(E)
4.3 Type BA — Asymmetrical barrel faced rectangular ring h WWWW 1,5 mm
1
4.3.1 General feature
See Table 12 for dimensions and forces.
Key
1 reference plane
2 mark
Figure 3 — Type BA
Table 2 — Barrel dimensions
Dimensions in millimetres
a
b b
h h h h tol. h
t t
1 25 26 26 27
2 3
1,5 0,35 0,50 1,15 0…0,005 0,007…0,022
± 0,15
1,75 0,35 0,55 1,35 0,008…0,025
± 0,20 0…0,007
2,0 0,40 0,60 1,50 0,009…0,030
2,5 0,45 0,70 1,80 0,011…0,035
± 0,25 0…0,008
3,0 0,55 0,80 2,10 0,012…0,038
3,5 0,60 0,90 2,40 0…0,009 0,012…0,040
± 0,30
a
h may be lowered for rings with reduced edge dimensions.
25
b
t and/or t may be varied as agreed between manufacturer and client.
2 3
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ISO 6622-2:2003(E)
4.3.2 Designation
EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-2 being a steel, rectangular
ring with an asymmetrical barrel faced peripheral surface (BA), of nominal diameter d = 80 mm (80) and of nominal ring
1
width h = 1,5 mm (1,5), made of martensitic steel (17 % Cr), subclass 66 (MC66), nitrided on the peripheral surface and
1
side faces (NT) to a depth of 0,05 mm min. on the peripheral surface (050), and with an associated side face depth of
0,015 mm min.:
Piston ring ISO 6622-2 BA - 80 ×××× 1,5 - MC66/NT050
4.4 Type M — Taper faced rectangular ring
NOTE Taper M1 excluded.
4.4.1 General features
See Table 12 for dimensions and forces.
Key
1 reference plane
2 mark
Figure 4 — Type M
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ISO 6622-2:2003(E)
Table 3 — Taper
Dimensions in minutes
c
Nitrided rings and chromium plated or spray coated rings with peripheral surface ground
Code
a a d
with IF (top side) with IFU (bottom side)
Taper Tolerance
b
Taper Tolerance Taper Tolerance
M2 30 30 — —
M3 60 60 60
+50 +60
0 0
+60
M4 90 90 90
0
M5 120 120 120
a
IF and IFU are explained in Figures 18 and 19.
b
For M rings (negative twist type) M3, M4 and M5, the twist angle should not exceed 90 % of the minimum taper angle.
+60
c
For chromium plated rings with tapered peripheral surface not ground, the tolerance shall be increased by 10 (e.g. M3 = 60:
0
+70
for M rings or for M rings with IF or IFU).
0
d
IFU not recommended for rings h u 1,2 mm
1
4.4.2 Designation
EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-2, being a steel, rectangular
ring with 60′ taper faced peripheral surface (M3), of nominal diameter d = 60 mm (60) and of nominal ring width
1
h = 1,5 mm (1,5), made of alloyed steel (CrSi), subclass 62 (MC62), with a chromium plated peripheral surface of a
1
minimum thickness of 0,1 mm (CR2):
Piston ring ISO 6622-2 M3 - 60 ���� 1,5 - MC62/CR2
5 Common features
5.1 Type R — Straight faced rectangular ring
5.1.1 Nitrided rings
Key
1 mark
Figure 5 — Nitrided type R rings
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ISO 6622-2:2003(E)
5.1.2 Chromium plated or spray coated rings
5.1.2.1 Fully faced
Key
1 mark
Figure 6 — Fully faced type R rings
5.1.2.2 Inlaid h W 1,2 mm (not recommended for chromium plated rings)
1
Key
1 mark
Figure 7 — Inlaid type R rings
5.2 Type B — Barrel faced rectangular ring
5.2.1 Nitrided rings
Key
1 mark
Figure 8 — Nitrided type B rings
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ISO 6622-2:2003(E)
5.2.2 Chromium plated or spray coated rings
5.2.2.1 Fully faced
Key
1 mark
Figure 9 — Fully faced type B rings
5.2.2.2 Inlaid h W 1,2 mm (not recommended for chromium plated rings)
1
Key
1 mark
Figure 10 — Inlaid type B rings
5.3 Type BA — Asymmetrical barrel faced rectangular ring h W 1,5 mm
1
5.3.1 Nitrided rings
Key
1 mark
Figure 11 — Nitrided type BA rings
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ISO 6622-2:2003(E)
5.3.2 Chromium plated or spray coated rings
5.3.2.1 Fully faced
Key
1 mark
Figure 12 — Fully faced type BA rings
5.3.2.2 Inlaid h W 1,2 mm (not recommended for chromium plated rings)
1
Key
1 mark
Figure 13 — Inlaid type BA rings
5.4 Type M — Taper faced rectangular ring
5.4.1 Fully tapered
5.4.1.1 Nitrided rings
Key
1 mark
Figure 14 — Nitrided type M rings
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ISO 6622-2:2003(E)
5.4.1.2 Chromium plated or spray coated rings
5.4.1.2.1 Fully faced
Key
1 mark
Figure 15 — Fully faced type M rings
5.4.1.2.2 Inlaid h W 1,2 mm (not recommended for chromium plated rings)
1
Key
1 mark
Figure 16 — Inlaid type M rings
5.4.2 Taper faced rectangular ring with partly cylindrical machined
...
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