1、DRAFT FOR DEVELOPMENT DD 209:1992 ISO/TR 6624-2:1988 Piston rings upto200mm diameter for reciprocating internal combustion engines: Specificationfor half keystone ringsDD209:1992 This Draft for Development havingbeen prepared under thedirection of the Machinery andComponents Standards PolicyCommitte
2、e, was publishedunderthe authority ofthe Standards Board and comesintoeffecton 1May 1992 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference MCE/14 ISBN 0 580 20746 3 Committees responsible for this Draftfor Development The preparation of this Draft for
3、Development 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 Limi
4、ted Amendments issued since publication Amd. No. Date CommentsDD209:1992 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Ring types and designation examples 1 4 Common features 3 5 Force factors 6 6 Dimens
5、ions 7 Figure 1 Type HK 1 Figure 2 Type HKB 2 Figure 3 Uncoated rings 3 Figure 4 Fully coated faced rings 3 Figure 5 Semi-inlaid coated rings 3 Figure 6 Inlaid coated rings 3 Figure 7 Outside chamfered edges (KA) 4 Figure 8 Inside chamfered edges (KI) 4 Figure 9 Outside and inside chamfered edges (K
6、A + KI) 4 Figure 10 Details of Figure 7, Figure 8 and Figure 9 4 Figure 11 Outside and inside rounded edges 5 Figure 12 Details of Figure 11 5 Figure 13 Layer thickness 5 Table 1 Gauge width (h 8 ) and barrel dimensions 2 Table 2 KA and KI dimensions 5 Table 3 Layer thickness 6 Table 4 Force correct
7、ion factors for HK- and HKB-rings with features KA and KI 6 Table 5 Force correction factors for coated HK- and HKB-rings (fully faced, semi-inlaid and inlaid types) 6 Table 6 Dimensions of HK- and HKB-half keystone rings with narrow ring width made of cast iron 7 Table 7 Dimensions of HK- and HKB-h
8、alf keystone rings with narrow ring width made of steel 8 Publication(s) referred to Inside back coverDD209:1992 ii BSI 02-2000 National foreword This Draft for Development has been prepared under the direction of the Machinery and Components Standards Policy Committee and is identical with ISO/TR 6
9、624-2:1988 “Internal combustion engines Piston rings Part 2: Half-keystone rings” published by the International Organization for Standardization (ISO). It is envisaged that, when ISO 6624-2 is published, this Draft for Development will be withdrawn and ISO 6624-2 will be published as BS 5341-7.3.2.
10、 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) S
11、ection 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 d
12、esignations 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 width 1) ; Section 7.2: Specification for scraper rings; (Identica
13、l with ISO 6623) Section 7.3: Specification for 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 rings 2) ; Section 7.4: Specification for oil control rings; (Identical with
14、 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 rings. BS 5341-6 to BS 5341-8 supersede BS 5341-1:1976
15、, BS 5341-2:1977, BS 5341-3:1986 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 envi
16、saged that this Subsection will be identical with ISO 6624-2 when the International Standard is published.DD209:1992 BSI 02-2000 iii Cross-reference (additional to those listed above) The Technical committee has reviewed the provisions of ISO 1101 to which normative reference is made in the text and
17、 has decided that they are acceptable for use in conjunction with this standard. This publication is not to be regarded as a British Standard It is being issued in the Draft for Development series of publications and is of a provisional nature because certain requirements contained therein may need
18、modification in the light of practical experience in its use. It should be applied on this provisional basis so that information and experience of its practical operation may be obtained. It is expected that ISO will review the Technical Report with which this Draft for Development is identical befo
19、re the end of 1992 and a request for the submission of comments from users of this Draft for Development will be made in an announcement in the appropriate issue of BSI News. According to the replies received, the responsible BSI committee will judge whether the UK should support conversion of the I
20、SO Technical Report into an ISO standard or what other action should be taken. Observations which it is felt should receive attention before the official call for comments will be welcomed. These should be sent to the secretary of BSI Technical Committee MCE/14 at BSI, 2 Park Street, London W1A 2BS.
21、 Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to10, 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 fr
22、ont cover.iv blankDD209:1992 BSI 02-2000 1 1 Scope and field of application This Technical Report specifies the essential dimensional features of HK- and HKB-half keystone rings with narrow ring width types. Dimension Table 6 and Table 7 allow for the use of cast iron (Table 6) or steel (Table 7). S
23、ince the modulus of elasticity of steel rings is higher than that of cast iron rings, the fluctuation in the surface pressure will become greater if the free gap is set as the reference for forces. Therefore forces are set using the surface pressure as the reference, in order to minimize the effect
24、of the fluctuation. The requirements of this Technical Report apply to half keystone rings of reciprocating internal combustion piston engines, up to and including 70 mm diameter for cast iron rings and up to and including 100 mm diameter for steel. 2 References ISO 1101, Technical drawings Geometri
25、cal tolerancing Tolerancing of form, orientation, location and run-out Generalities, definitions, symbols, indications on drawings. ISO 6621, Internal combustion engines Piston rings Part 2: Measuring principles; Part 3: Material specifications; Part 4: General specifications. 3 Ring types and desig
26、nation examples NOTEFor the angle of half keystone rings, the same definition and measurement apply as for keystone rings: see ISO 6621-2. 3.1 Type HK Straight-faced half keystone ring 7 3.1.1 General features NOTESee Table 6 or Table 7 for dimensions and forces. Figure 1 Type HKDD209:1992 2 BSI 02-
27、2000 3.1.2 Designation example Designation of a straight-faced half keystone ring 7 of d 1= 60 mm nominal diameter, h 1= 1,25 mm ring width, made of steel (material subclass 62), general features as shown in Figure 1, and periphery chromium-coated fully faced design 0,1 mm minimum thickness: Piston
28、ring ISO/TR 6624-2 HK 60 1,25 MC62/CR2 3.2 Type HKB Barrel-faced half keystone ring 7 3.2.1 General features NOTESee Table 6 or Table 7 for dimensions and forces. Table 1 Gauge width (h 8 ) and barrel dimensions 3.2.2 Designation example Designation of a barrel-faced half keystone ring 7 of d 1= 60
29、mm nominal diameter, h 1= 1,25 mm ring width, made of steel (material subclass 62), general features as shown in Figure 2, and periphery molybdenum-coated inlaid design 0,1 mm minimum thickness: Piston ring ISO/TR 6624-2 HKB 60 1,25 MC62/MO2 Figure 2 Type HKB Dimensions in millimetres (h 1 ) h 8 t 2
30、 , t 3Maximum peak off centre 1,25 0,6 0,002 0,012 0,2 1,55 0,8 0,003 0,015 0,25DD209:1992 BSI 02-2000 3 4 Common features 4.1 Types HK and HKB Half keystone ring 4.1.1 Uncoated rings 4.1.2 Coated rings (chromium or molybdenum) 4.1.2.1 Fully faced 4.1.2.2 Semi-inlaid 4.1.2.3 Inlaid Figure 3 Uncoated
31、 rings Figure 4 Fully faced coated rings Figure 5 Semi-inlaid coated rings Figure 6 Inlaid coated ringsDD209:1992 4 BSI 02-2000 4.2 Chamfered edges (cast iron rings) 4.2.1 HK- and HKB-rings Outside chamfered edges (KA) 4.2.2 HK- and HKB-rings Inside chamfered edges (KI) 4.2.3 HK- and HKB-rings Outsi
32、de and inside chamfered edges (KA + KI) Figure 7 Outside chamfered edges (KA) Figure 8 Inside chamfered edges (KI) Figure 9 Outside and inside chamfered edges (KA + KI) Figure 10 Details of Figure 7, Figure 8 and Figure 9DD209:1992 BSI 02-2000 5 Table 2 KA and KI dimensions 4.3 HK- and HKB- steel ri
33、ngs Outside and inside rounded edges 4.4 HK- and HKB-rings (fully faced, semi-inlaid and inlaid) Layer thickness Dimensions in millimetres KA KI 0,15 0,1 max. 0,2 Figure 11 Outside and inside rounded edges Figure 12 Details of Figure 11 Figure 13 Layer thicknessDD209:1992 6 BSI 02-2000 Table 3 Layer
34、 thickness 5 Force factors The tangential and diametral forces given in Table 6 shall be corrected when additional features and/or materials other than grey cast iron with a modulus of elasticity of 100 GN/m 2are being used. For common features, multiplier correction factors given in Table 4 and Tab
35、le 5 and the force correction factors given in ISO 6621-4 shall be used. Also the tangential and diametral forces given in Table 7 shall be corrected when additional features are being used. Table 4 Force correction factors for HK- andHKB-rings with features KA and KI Table 5 Force correction factor
36、s for coated HK- and HKB-rings (fully faced, semi-inlaid, and inlaid types) Dimensions in millimetres Chromium Molybdenum Thickness min. CR1 M01 0,05 CR2 M02 0,1 CR3 a M039 0,15 a CR3 and M03 apply to rings with nominal diameters of50mm or greater. Factor KA KI KA and KI 0,98 0,98 0,96 d 1(reference
37、 coating) Factor mm CR1 CR2/M01 CR3 M02 M03 38 u d 1 50 0,81 0,7 0,64 50 u d 1u 100 0,9 0,85 0,81 0,81 0,75DD 209:1992 BSI 02-2000 7 6 Dimensions Table 6 Dimensions of HK- and HKB-half keystone rings with narrow ring width made of cast iron NOTE 1For intermediate sizes (for example repair sizes), th
38、e radial wall thickness of the next smaller nominal diameter shall be applied. NOTE 2The values for F tand F d , given in Table 6, apply to as-cast grey cast iron with a typical modulus of elasticity (E n ) of 100 GN/m 2 . Multiplying factors for materials having a different modulus of elasticity (E
39、 n ) are given in ISO 6621-4. Mean forces are calculated for nominal radial wall thickness (a 1 ) and mean ring width (h 1 ). NOTE 3For the sole purpose of this Technical Report, the assumed average ratio F d /F tis 2,15. However, for rings up to 50 mm the ratio F d /F tshall be determined between m
40、anufacturer and client.DD 209:1992 8 BSI 02-2000 Table 7 Dimensions of HK- and HKB-half keystone rings with narrow ring width made of steelDD 209:1992 BSI 02-2000 9Table 7 Dimensions of HK- and HKB-half keystone rings with narrow ring width made of steel NOTE 1For intermediate sizes (for example rep
41、air sizes), the radial wall thickness of the next smaller nominal diameter shall be applied. NOTE 2The values for F tand F d , given in Table 7, apply to steel with a typical modulus of elasticity (E n ) of 200 GN/m 2 . Mean forces are calculated for nominal radial wall thickness (a 1 ) and mean rin
42、g width (h 1 ). NOTE 3For the sole purpose of this Technical Report, the assumed average ratio F d /F tis 2,15. However, for rings up to 50 mm the ratio F d /F tshall be determined between manufacturer and client.10 blankDD209:1992 BSI 02-2000 Publication(s) referred to See national foreword.DD 209:
43、1992 ISO/TR 6624-2:1988 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisio
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