BS-5341-7.2-1992 ISO-6623-1986.pdf

BRITISH STANDARD BS 5341-7.2: 1992 ISO 6623:1986 Piston rings up to 200 mm diameter for reciprocating internal combustion engines Part 7: Designs, dimensions and designations for single piece rings Section 7.2 Specification for scraper rings Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 This British Standard, having been prepared under the direction of the Machinery and Components Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 1 May 1992 © BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference MCE/14 Draft for comment 84/72264 DC ISBN 0 580 20740 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machinery and Components Standards Policy Committee (MCE/-) to Technical Committee MCE/14, upon which the following bodies were represented: Association of Consulting Engineers British Railways Board Ministry of Defence Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 © BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2Reference1 3Ring types and designation examples1 4Common features5 5Force factors6 6Dimensions7 Figure 1 Types N, NM, E and EM2 Figure 2 Type N Detail of Figure 12 Figure 3 Type NM Detail of Figure 13 Figure 4 Type E Detail of Figure 13 Figure 5 Type EM Detail of Figure 14 Figure 6 Inside chamfered edges (KI)5 Figure 7 Layer thickness5 Table 1 r2 dimensions2 Table 2 Taper2 Table 3 KI dimensions5 Table 4 Layer thickness3 Table 5 Force correction factors for N-, NM-, E- and EM-rings, with feature KI6 Table 6 Force correction factors for N-, NM-, E- and EM-rings, molybdenum-coated (inlaid type)6 Table 7 Dimensions for N-, NM-, E- and EM-scraper rings (radial wall thickness “regular”)7 Table 8 Dimensions for N-, NM-, E- and EM-scraper rings (radial wall thickness “D/22”)11 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 ii © BSI 01-2000 National foreword This Section of BS 5341 has been prepared under the direction of the Machinery and Components Standards Policy Committee and is identical with ISO 6623:1986 “Internal combustion engines Piston rings Scraper rings” published by the International Organization for Standardization (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 ISO standards as indicated: Part 6: Vocabulary, inspection methods and generic specifications; Section 6.1: Vocabulary; (Identical with ISO 6621-1) Section 6.2: Inspection measuring principles; (Identical with ISO 6621-2) Section 6.3: Material specifications; (Identical with ISO 6621-3) Section 6.4: General specifications; (Identical with ISO 6621-4) Section 6.5: Quality requirements. (Identical with ISO 6621-5) Part 7: Designs, dimensions and designations for single piece rings; Section 7.1: Rectangular compression rings; Subsection 7.1.1: Specification for rectangular rings; (Identical with ISO 6622-1) Subsection 7.1.2: Specification for rectangular rings with narrow ring width1); Section 7.2: Specification for scraper rings; (Identical with ISO 6623) Section 7.3: Keystone and half keystone compression rings; Subsection 7.3.1: Specification for keystone rings; (Identical with ISO 6624-1) Subsection 7.3.2: Specification for half keystone rings2); Section 7.4: Specification for oil control rings. (Identical with ISO 6625) Part 8: Designs, dimensions and designations for multi-piece oil control rings; Section 8.1: Specification for coil-spring-loaded oil control rings; (Identical with ISO 6626) Section 8.2: Specification for expander/segment oil control rings3). BS 5341-6 to BS 5341-8 supersede BS 5341-1:1976, BS 5341-2:1977, BS 5341-3:1976 and BS 5341-4:1976 which are withdrawn. 1) It is envisaged that this Subsection will be identical with ISO 6622-2 when the International Standard is published. The technical report ISO/TR 6622-2 is published in the UK as a Draft for Development, DD 208. 2) It is envisaged that this Subsection will be identical with ISO 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 will be identical with ISO 6627 when the International Standard is published. ISO/TR 6627 will shortly be published in the UK as a Draft for Development. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 © BSI 01-2000iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 © BSI 01-20001 0 Introduction ISO 6623 is one of a series of International Standards dealing with piston rings for reciprocating internal combustion engines: ISO 6621, Internal combustion engines Piston rings Part 1: Vocabulary; Part 2: Measuring principles; Part 3: Material specifications; Part 4: General specifications4); Part 5: Quality requirements4). ISO 6622, Internal combustion engines Piston rings Part 1: Rectangular rings; Part 2: Rectangular rings with narrow ring width5). ISO 6623, Internal combustion engines Piston rings Scraper rings. ISO 6624, Internal combustion engines Piston rings Part 1: Keystone rings; Part 2: Half keystone rings6). ISO 6625, Internal combustion engines Piston rings Oil control rings. ISO 6626, Internal combustion engines Coil spring loaded oil control rings4). The common features and dimensional tables presented in this International Standard constitute a broad range of variables, and the designer, 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 ISO 6621-3 and ISO 6621-4 before completing his selection. 1 Scope and field of application This International Standard specifies the essential dimensional features of N-, NM-, E- and EM-scraper piston ring types. Dimensional Table 7 and Table 8 offer the choice of two radial wall thicknesses: radial wall thickness “regular” (Table 7); radial wall thickness “D/22” (Table 8). The requirements of this International Standard apply to scraper rings for reciprocating internal combustion piston engines, up to and including 200 mm diameter. It may also be used for piston rings of compressors working under similar conditions. 2 Reference ISO 6621, Internal combustion engines Piston rings Part 3: Material specifications; Part 4: General specifications4). 3 Ring types and designation examples 3.1 Types N, NM, E and EM Scraper rings Common general features NOTESee Table 7 or Table 8 for dimensions and forces. 4) At present at the stage of draft. 5) At present at the stage of draft (will be published as a Technical Report). 6) In preparation (will be published as a Technical Report). Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 2 © BSI 01-2000 3.2 Type N Napier ring (undercut step) 3.2.1 General features 3.2.2 Designation example Designation of a Napier ring of d1 = 90 mm nominal diameter, radial wall thickness “regular”, h1 = 2,5 mm ring width, made of grey cast iron, non-heat-treated (material subclass 12), general features as shown in Figure 1 and Figure 2, and inside chamfered edges: Piston ring ISO 6623 N 90 × 2,5 MC12 KI Figure 1 Types N, NM, E and EM Table 1 r2 dimensions Dimensions in millimetres d1 r2 max. 30 u d1 1750,3 175 u d1 u 2000,7 * See Table 1. Figure 2 Type N Detail of Figure 1 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 © BSI 01-20003 3.3 Type NM Napier ring (undercut step), taper faced 3.3.1 General features 3.3.2 Designation example Designation of a Napier ring, taper faced M4 = 90½, of d1= 90 mm nominal diameter, radial wall thickness “regular”, h1= 2,5 mm ring width, made of grey cast iron, heat-treated (material subclass 21), general features as shown in Figure 1 and Figure 3, and phosphated all over: Piston ring ISO 6623 NM4 90 × 2,5 MC21 PO 3.4 Type E Scraper ring (stepped) 3.4.1 General features Table 2 Taper Taper Uncoated and coated rings (molybdenum) Tolerance M110½ +60½ 0 M230½ M360½ M490½ * See Table 1. * See Table 2. Figure 3 Type NM Detail of Figure 1 * See Table 1. Figure 4 Type E Detail of Figure 1 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 4 © BSI 01-2000 3.4.2 Designation example Designation of a scraper ring of d1 = 90 mm nominal diameter, radial wall thickness “regular”, h1= 2,5 mm ring width, made of grey cast iron, non-heat-treated (material subclass 12), general features as shown in Figure 1 and Figure 4, and periphery molybdenum-coated inlaid design, 0,10 mm minimum thickness: Piston ring ISO 6623 E 90 × 2,5 MC12 MO2F 3.5 Type EM Scraper ring (stepped) taper faced 3.5.1 General features 3.5.2 Designation example Designation of a scraper ring taper faced M2 = 30½, of d1= 90 mm nominal diameter, radial wall thickness “regular”, h1 = 2,5 mm ring width, made of grey cast iron, heat-treated (material subclass 22), general features as shown in Figure 1 and Figure 5, and inside chamfered edges: Piston ring ISO 6623 EM2 90 × 2,5 MC22 KI * See Table 1. * See Table 2. Figure 5 Type EM Detail of Figure 1 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 © BSI 01-20005 4 Common features 4.1 N-, NM-, E- and EM-rings Inside chamfered edges (KI) Table 3 KI dimensions 4.2 N-, NM-, E- and EM-rings, coated (molybdenum inlaid) Layer thickness Figure 6 Inside chamfered edges (KI) Dimensions in millimetres d1KI 30 u d1 500,2 max. 50 u d1 1250,3 ± 0,15 125 u d1 1750,4 ± 0,15 175 u d1 u 2000,6 ± 0,2 Table 4 Layer thickness Dimensions in millimetres Molybdenum Thickness min. MO10,05 MO20,10 MO30,15 MO40,20 Figure 7 Layer thickness Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 6 © BSI 01-2000 5 Force factors The tangential and diametral forces given in Table 7 and Table 8 shall be corrected, when additional features and/or materials other than grey cast iron with a modulus of elasticity of 100 GN/m2 are being used. For common features, the multiplier correction factors given in Table 5 and Table 6 and the force correction factors given in ISO 6621-4 shall be used. The factors of Table 6 have been calculated with mean coating thickness. Table 5 Force correction factors for N-, NM-, E- andEM-rings, with feature KI Table 6 Force correction factors for N-, NM-, E- and EM-rings,molybdenum-coated (inlaid type) d1 mm Factor 30 u d1 501 50 u d1 u 2000,97 d1 mm Factor MO1MO2MO3MO4 30 u d1 500,810,75 50 u d1 1000,900,860,830,80 100 u d1 1500,940,910,890,87 150 u d1 u 2000,950,940,920,90 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 © BSI 01-20007 6 Dimensions Table 7 Dimensions for N-, NM-, E- and EM-scraper rings (radial wall thickness “regular”) Dimensions in millimetres Nominal diameter d1 Radial wall thickness “regular” a1 Ring width h1 Closed gap s1 Axial width of step h2 Radial depth of step a2 Tangential force Ft, N Diametral force Fd, N ColumnFor h1 shown in columnFor h1 shown in columnFor h1 shown in column Tolerance1234ToleranceTolerance12341234Tolerance1234Tolerance 301,25 ± 0,15 Within a ring: 0,15 max. 6,27,58,610,8 ± 30 % if Fd 21,5 N ± 20 % if Fd W 21,5 N 311,3 0,010 0,030 For phosphated PO surface: 0,005 0,030 0,36,78911,4 321,35± 0,157,18,49,712 331,47,18,69,912,5 341,46,789,211,6 351,457,18,49,712,3 361,57,58,810,312,9 371,550,489,210,813,5 381,6± 0,158,29,711,214,2 391,658,610,111,814,8 401,658,29,711,214,2 411,78,610,111,614,8 421,75910,512,315,5 431,8 +0,2 0 910,812,515,7 441,850,159,511,212,916,3 451,99,711,613,316,8 461,99,21112,716,1 471,950,59,711,413,116,8 482± 0,1510,111,813,817,4 492,051,51,7522,50,40,450,50,610,512,314,218,1 502,1± 0,15± 0,15± 0,15± 0,1555,96,98,710,812,714,818,7 512,155,26,27,1911,213,315,319,4 522,1555,96,88,610,812,714,618,5 532,2566,98,710,812,914,818,7 542,25 0,6 ± 0,15 5,26,27,1911,213,315,319,4 552,35,46,47,49,3 ± 30 % if Ft 10 N ± 20 % if Ft W 10 N 11,613,815,920 562,355,66,67,69,61214,216,320,6 572,45,76,87,89,912,314,616,821,3 582,45,56,67,69,611,814,216,320,6 592,455,76,87,89,912,314,616,821,3 602,55,96,9810,112,714,817,221,7 612,5567,18,210,412,915,317,622,4 622,6 0,7 ± 0,15 6,17,28,310,513,115,517,822,6 632,656,27,48,510,813,315,918,323,2 642,65 +0,2 0 67,18,310,512,915,317,822,6 652,70,26,27,38,510,813,315,718,323,2 662,756,47,68,711,113,816,318,723,9 672,86,67,8911,414,216,819,424,5 682,856,789,211,714,417,219,825,2 692,96,98,29,41214,817,620,225,8 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:46:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5341-7.2:1992 8 © BSI 01-2000 Table 7 Dimensions for N-, NM-, E- and EM-scraper rings (radial wall thickness “regular”) Dimensions in millimetres Nominal diameter d1 Radial wall thickness “regular” a1 Ring width h1 Closed gap s1 Axial width of step h2 Radial depth of step a2 Tangential force Ft, N Diametral force Fd, N ColumnFor h1 shown in columnFor h1 shown in columnFor h1 shown in column Tolerance1234ToleranceTolerance12341234Tolerance1234Tolerance 702,90,76,77,99,211,614,41719,824,9 712,95 +0,2 0 ± 0,156,98,19,411,914,817,420,225,6 7230,26,98,29,51214,817,620,425,8 733,057,18,4