1、Piston rings up to 200 rnm diameter for reciprocating internal combustion engines Part 8. Designs, dimensions and designations for multi-piece oil control rings Section 8. I Specification for coil-spring-loaded oil control rings BS 5341 : Section 8.1 : 1992 IS0 6626 : 1989 Committees responsible for
2、 this British Standard Amd. No, Standards Board and comes into effect on 1 May 1992 O BSI 1992 The following BSI references relate to the work on this standard: Committee reference MCEl4 Draft for comment 86/76886 DC ISBN O 680 20744 7 The preparation of this British Standard was entrusted by the Ma
3、chinery and Components Standards Policy Committee (MCE/-) to %chnical Committee MCE/14, upon which the following bodies were represented: Date Txt affected Association of Consulting Engineers British Railways Board Ministiy of Defence Society of Motor Manufacturers and Tradeis Limited BS 5341 : Sect
4、ion 8.1 : 1992 Contents Committees responsible National foreword Page Inside front cover iii Specification O Introduction 1 1 Scope and field of application 1 2 References 1 3 Piston ring types and designation examples 2 4 Common features 9 5 coilspi-ing 11 6 nngential force and nominal contact pres
5、sure 12 7 Dimensions 16 ables 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 16 17 18 19 Cutter diameter Reduced slot length Layer thickness Land offset tolerance Spring groove offset tolerance Coil-spring excursion Classes of nominal contact pressure Oil control ring pressure classes Dimensions for DSF-C coil
6、-spring-loaded oil control rings Dimensions for DSF-CNP coil-spring-loaded oil control rings Dimensions for SSF coil-spring-loaded oil control rings Dimensions for GSF and DSF coil-spi-ing-loaded oil control rings Dimensions for DSF-NG coil-spring-loaded oil control rings Dimensions for SSF-L coil-s
7、piing-loaded oil control rings Dimensions for DSF-C coil-spring-loaded oil control rings with special ring width hl = 4,75 tm (3/16 in) Dimensions for DSF-CNP coil-spring-loaded oil control rings with special ring width hl = 4,75 mm (3/16 in) Dimensions for SSF coil-spring-loaded oil control rings w
8、ith special Dimensions for GSF and DSF coil-spring-loaded oil control rings with special iing width hl = 4,75 mm (3/16 in) Dimensions for DSF-NG coil-spring-loaded oil control rings with special iing width hl = 4,75 mm (3/16 in) ring width hl = 4,75 (3/16 in 20 Dimensions for SSF-L coil-spring-loade
9、d oil control rings with special ring width hl = 4,75 mm (3116 in) 9 10 10 10 10 12 13 15 16 20 24 28 32 36 40 42 44 46 48 50 i BSI BSS5341: SECS8.L 92 D 1b24bb9 02881b7 8 D BS 5341 : Section 8.1 : 1992 Page Figures 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Type DSF-C Type DSF-CNP Type SSF Type GSF Type D
10、SF Type DSF-NG Type SSF-L Arrangement of slots Layer thickness Type CSN coil spring Type CSG coil spring Type CSE coil spring Position of area with small pitch Coil-spring excursion Characteristic values of p, depending on dl 2 3 4 5 6 7 8 9 10 11 11 11 11 12 14 BS 5341 : Section 8.1 : 1992 National
11、 foreword This Section of BS 5341 has been prepared under the direction of the Machineiy and Components Standards Policy Committee and is identical with IS0 6624 : 1989 Internal combustion engines - Piston rings - Coil-spiing-loaded oil control rings published by the International Organization for S
12、tandardization (ISO) . Full requirements for piston rings for internal combustion engines are given in the following Parts and Sections of BS 5341 which are identical with IS0 standards as indicated: Part 6. Vocabulary, inspection methods and generic specifications Section 6.1 Vocabulai-y Section 6.
13、2 Inspection measuring piinciples Section 6.3 Material specifications Section 6.4 General specifications Section 6.5 Quality requirements Part 7. Designs, dimensions and designations for single piece iings Section 7.1 Rectangular compression iings (Identical with IS0 6621-1) (Identical with IS0 6621
14、-2) (Identical with IS0 6621-3) (Identical with IS0 6621-4) (Identical with IS0 6621-5) Subsection 7.1.1 l)Subsection 7.1.2 Specification for rectangular rings with narrow ring width Specification for rectangular rings (Identical with IS0 6622-1) Specification for scraper rings (Identical with IS0 6
15、623) Keystone and half keystone compression rings Specification for keystone rings (Identical with IS0 6624-1) Section 7.4 Specification for oil control iings (Identical with IS0 6625) Part 8. Designs, dimensions and designations for multi-piece oil control iings Section 8.1 Specification for coil-s
16、piing-loaded oil control rings (Identical with IS0 6626) 3)Section 8.2 Specification for expanderkegment oil control rings BS 5341 : Parts 6 to 8 supersede BS 5341 : Part 1 : 1976, Part 2 : 1977, Part 3 : 1976 and Part 4 : 1976 which are withdrawn. Section 7.2 Section 7.3 Subsection 7.3.1 2k3ubsecti
17、on 7.3.2 Specification for half keystone rings It is envisaged that this Subsection will be identical with IS0 6622-2 when the international standard is published. The technical report ISO/TFt 6622-2 is published in the UK as a Draft for Development, DD 208. 2, It is envisaged that this Subsection w
18、ill be identical with IS0 6624-2 when the international standard is published. The technical report ISO/TR 6624-2 is published in the UK as a Draft for Development, DD 209. 3, It is envisaged that this Section wiii be identical with IS0 6627 when the international standard is published. ISO/TR 6627
19、will shortly be published in the UK as a Draft for Development. iii Cross-reference (additional to those listed above) The %chnical Committee has reviewed the provisions of IS0 1101 to which normative reference is made in the text and has decided that they are acceptable foi use in conjunction with
20、this standard. Compliance with a British Standard does not of itself confer immunity from legal obligations. INTERNATIONAL STANDARD IS0 6626 : 1989 (E) Internal combustion engines - Piston rings - Coil-spring-loaded oil control rings O Introduction IS0 6626 is one of a series of International Standa
21、rds dealing with piston rings for reciprocating internal combustion engines : IS0 6621, Internal combustion engines - Piston rings - Part 1: Vocabulary. Part 2: Measuring princles. Part 3: Material specifications. Part 4: General specifications. Part 5: Quality requirements. IS0 6622, Internal combu
22、stion engines - Piston rings - Part 1 : Rectangular rings. Part 2: Rectangular rings with narrow ring width. I) IS0 6623, Internal combustion engines - Piston rings - Scraper rings. IS0 6624, Internal combustion engines - Piston rings - Part I: Keystone rings. Part 2: Half keystone rings. 1) IS0 662
23、5, Internal combustion engines - Piston rings - Oil control rings. IS0 6626, Internal combustion engines - Piston rings - Coil- spring-loaded oil control rings. The common features and dimensional tables presented in this International Standard constitute a broad range of variables and the designer,
24、 in selecting a particular ring type, shall bear in mind the conditions under which it will be required to operate. It is also essential that the designer refers to the specifications and requirements of IS0 6621-3 and IS0 6621-4 before completing his selection. 1 Scope and field of application This
25、 International Standard specifies the essential dimensions of piston ring types DSF-C, DSF-CNP, SSF, GSF, DSF, DSF-NG and SSF-L coil-spring-loaded oil control rings. For the cast iron part the recommended material is class 10 ac- cording to IS0 6621-3. For special applications material classes 20 to
26、 50 may be used. Variation in face design and spring groove from these may be used, as recommended by individual manufacturers, in plain or chromed versions. The tangential forces of coil-spring-loaded oil control rings can be varied over a wide range. Explanations and recommenda- tions are given in
27、 clause 6. The normal range for axial width of coil-spring-loaded oil con- trol rings (3 to 8 mm inclusive) is divided into 0,5 or 1,0 mm steps. In tables 15 to 20 dimensions are given for coil-spring- loaded oil control rings with an axial width of 4,75 mm (.e. 3/16 in) for existing applications in
28、 inch units. This International Standard applies to coil-spring-loaded oil control rings up to 200 mm inclusive for reciprocating internal combustion engines. It may also be used for piston rings of compressors working under analogous conditions. 2 References IS0 1101, Technical drawings - Toleranci
29、ng of form, orienta- tion, location and run-out - Generalities, definitions, symbols, indications on drawings. IS0 6621, Internal combustion engines - Piston rings - Part 3: Material specifications. Part 4: General specifications. Part 5: Quality requirements. 1) Part will be published as a Technica
30、l Report (ISO/TR 6622-2 and ISOITR 6624-2). 1 IS0 6626 : 1989 (E) 3 Piston ring types and designation examples 3.1 Type DSF-C - Coil-spring-loaded bevelled-edge oil control ring, chromium-plated and profile ground 3.1.1 General features NOTE - Dimensions and forces: see tables 9 and 15. Dimensions i
31、n millimetres X i. ,+YJT), E- 2) See table 5. Figure 1 - Type DSF-C 3.1.2 Designation example Designation of a piston ring complying with the requirements of IS0 6626, being a coil-spring-loaded bevelled-edge oil control ring, chromium-plated and profile ground (DSF-C), of nominal diameter dl = 125
32、mm (1251, a nominal ring width hl = 5 mm (51, made of grey cast iron, non-heat-treated, material subclass 11 (MC 11 ). A selected closed gap of 0,2 mm (S021, a chromium layer thickness on the lands of 0,15 mm min. (CR3) phosphated on all cast iron surfaces to depth of 0,002 mm min. (PO), reduced slo
33、t length (WK), coil- spring with reduced heat set (WF), and variable pitch with coil diameter d7 ground (CSE), tangential force Ft according to the medium nominal contact pressure class (PNM) and the ring marked with manufacturers mark (MM): Piston ring IS0 6626-DSF-C-125 x 5-MC11/SM CR3 PO WK WF CS
34、E PNM MM 2 3.2 Type DSF-CNP - Coil-spring-loaded bevelled-edge oil control ring, chromium-plated not profile ground 3.2.1 General features NOTE - Dimensions and forces: see tables 10 and 16. Dimensions in millimetres 2) See table 5. I Figure 2 - Type DSF-CNP 3.2.2 Designation example Designation of
35、a piston ring complying with the requirements of IS0 6626, being a coil-spring-loaded bevelled-edge oil control ring, chromium-plated not profile ground (DSF-CNP), of nominal diameter dl = 180 mm (180) and nominal ring width hl = 8 mm (81, made of grey cast iron, non-heat-treated, material subclass
36、12 (MC12), a chromium layer thickness on the lands of 0,05 mm min. (CRI), constant pitch spring (CSN) and tangential force Ft according to the high nominal contact pressure class (PNH): Piston ring IS0 66%-DSF-CNP-180 x 8-MC12/CR1 CSN PNH 3 BSI BS*5343: SEC*8.L 92 M 3624bb9 0288373 3 = IS0 626 : 198
37、9 (E) 3.3 Type SSF - Coil-spring-loaded slotted oil control ring 3.3.1 General features NOTE - Dimensions and forces: see tables 11 and 17. Dimensions in millimetres Figure 3 - Type SSF 3.3.2 Designation example Designation of a piston ring complying with the requirements of IS0 6626, being a coil-s
38、pring-loaded slotted oil control ring (SSF), of nominal diameter dl = 80 mm (80) and nominal ring width hl = 4 mm (4), made of grey cast iron, non-heat-treated, material subclass 12 (MC12), constant pitch spring (CSN) and tangential force Ft according to the low nominal contact pressure class (PNL):
39、 Piston ring IS0 6626-SSF-80 x 4-MCIS/CSN PNL 4 IS0 626 : 1989 (E) 3.4 Type GSF - Coil-spring-loaded double-bevelled oil control ring 3.4.1 General features NOTE - Dimensions and forces: see tables 12 and 18. Dimensions in millimetres Figure 4 - Type GSF 3.4.2 Designation example Designation of a pi
40、ston ring complying with the requirements of IS0 6626, being a coil-spring-loaded double-bevelied oil control ring (GSF), of nominal diameter dl = 75 mm (751, a nominal ring width hl = 3 mm (31, made of grey cast iron, non-heat-treated, material subclass 12 (MC121, constant pitch spring (CSNI and a
41、tangential force Ft according to the low nominal contact pressure class (PNLJ : Piston ring IS0 6626-GSF-75 x 3-MC12/CSN PNL 5 IS0 626 : 1989 (E) 3.5 Type DSF - Coil-spring-loaded bevelled-edge oil control ring 3.5.1 General features NOTE - Dimensions and forces: see tables 12 and 18. Dimensions in
42、millimetres X e 1) See table 4. Figure 5 - Type DSF 3.5.2 Designation example Designation of a piston ring complying with the requirements of IS0 6626, being a coil-spring-loaded bevelled-edge oil control ring (DSF), of nominal diameter dl = 90 mm (90) and nominal ring width hl = 3,5 mm (3,5), made
43、of grey cast iron, non-heat-treated, material subclass 12 (MC121, constant pitch spring (CSNI and tangential force Ft according to the reduced nominal contact pressure class (PNR): Piston ring IS0 6626-DSF-90 x 3,5-MC12/CSN PNR 6 3.6 Type DSF-NG - Coil-spring-loaded bevelred-edge oil control ring (f
44、ace geometry similar to type DSF-C or type DSF-CNP) 3.6.1 General features NOTE - Dimensions and forces: see tables 13 and 19. Dimensions in millimetres 1) See table 4. Figure 6 - Type DSF-NG 3.6.2 Designation example Designation of a piston ring complying with the requirements of IS0 6626, being a
45、coil-spring-loaded bevelled-edge oil control ring (DSF-NG) of nominai diameter dl = 140 mm (140) and nominal ring width h, = 6 rnm (61, made of grey cast iron, non-heat-treated, material subclass 12 (MC121, constant pitch spring (CSNI and a tangential forceF, according to the medium nominal contact
46、pressure class (PNM): Piston ring IS0 6626- DSF-NG - 140 x 6- MC12/CSN PNM 7 BSI BSX5341: SECX8.1 92 W Lb24bb9 0288177 O = IS0 6626 : 1989 (E) 3.7 Type SSF-L - Coil-spring-loaded slotted oil control ring with 0,6 mm nominal land width 3.7.1 General features NOTE - Dimensions and forces: see tables 1
47、4 and 20. Dimensions in millimetres X I! See table 4. Figure 7 - Type SSF-L 3.7.2 Designation example Designation of a piston ring complying with the requirements of IS0 6626, being a coil-spring-loaded slotted oil control ring with 0,6 mm nominal land width (SSF-LI, of nominal diameter d, = 100 mm
48、(100) and nominal ring width hl = 4,5 mm (4,5), made of grey cast iron, non-heat-treated, material subclass 12 (MCIZ), constant pitch spring (CSN) and tangential force Ft according to the reduced nominal contact pressure class (PNR) : Piston ring IS0 6626-SSF-L-100 x 4,5-MC12/CSN PNR 8 4 Common feat
49、ures 4.1 Arrangement of slots I a) 8 slots for60 51,f 52 52.L 52,E 53,; 53,E 54 5484 54,s 55,2 55,E - - 1 - 2,: O -0,: - 2.6 O -0.1 2.8 O 0.2 - 3 O 0.2 2 - 2,: O o,: - 2.r O 0.i - 2.6 O 0.2 2.8 O 0.2 - 9 1 1.2 3 - 2. O -0, - 2,: O .O,: - 2.: O o,; - 2.6 O 0.2 2.7 3 3.2 2 - 1.1 zo.1 1.2 o. 1 1.4 0,l 3 - 1.2 :O,l 1.4 o. 1 1.6 0.1 1 - 2. +O. O 2. +o. O 2, k0,l O 3.1 -0.1 O 3.3 0,x O 2 - 2. +0,1 O 2.9 to.1 O 3.1 b0,l O 3.3 0.15 O 3.7 0.15 O 3 - 2,s k0, O 3.1 -0.1 O 3.3 D,lt O 3.7 1.15 1 1.15 1.15 I 4 - 3.1 IO, O 3.3 0,1! O 3.3 0,x O - 3.7 D,lE D 1.15 1.15 1 1.55 1.
