1、August 2010 Translation by DIN-Sprachendienst.English price group 18No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、 23.100.60!$jB6“1713119www.din.deDDIN ISO 3601-2Fluid power systems O-rings Part 2: Housing dimensions for general applications (ISO 3601-2:2008)English translation of DIN ISO 3601-2:2010-08Fluidtechnik O-Ringe Teil 2: Einbaurume fr allgemeine Anwendungen (ISO 3601-2:2008)Englische bersetzung von DI
3、N ISO 3601-2:2010-08Transmissions hydrauliques et pneumatiques Joints toriques Partie 2: Dimensions des logements pour applications gnrales (ISO 3601-2:2008)Traduction anglaise de DIN ISO 3601-2:2010-08SupersedesDIN 3771-5:1993-11www.beuth.deIn case of doubt, the German-language original shall be co
4、nsidered authoritative.Document comprises 48 pages08.10 DIN ISO 3601-2:2010-08 A comma is used as the decimal marker. Contents Page National foreword .3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions5 4 Symbols 6 5 O-ring housings .7 5.1 Typical O-ring applications.7 5.2
5、Surface roughness 10 5.3 Housing dimensions10 5.4 Corners and edges of undefined shape 12 5.5 Lead-in chamfer .13 5.6 Calculation of housing dimensions for radial sealing applications .13 6 Requirements .17 6.1 Housing dimensions17 6.2 Determining O-ring size for custom housing dimensions 18 6.3 Gla
6、nd fill consideration in design of housings.18 6.4 Temperature consideration in design of housings 18 7 Identification statement.18 Annex A (informative) Correlation of ISO 3601-1 aerospace O-ring size identification code with EN 3748 O-ring housing codes 41 Annex B (informative) How to determine th
7、e proper O-ring size for custom housings used for radial and axial applications .42 Bibliography 48 2 Start of validity This standard takes effect on 1 August 2010. National foreword This standard has been prepared by Technical Committee ISO/TC 131 “Fluid power systems”, Subcommittee SC 7 “Sealing d
8、evices”, Working Group WG 3 “Fluid power systems and components Sealing devices The responsible German body involved in its preparation was the Normenausschuss Maschinenbau (Mechanical Engineering Standards Committee), Working Committee NA 060-36-73 AA O-Ringe of section Fluidtechnik. It was possibl
9、e to incorporate most of the experience gained from the application of DIN 3771-5 in Germany into the first edition of this International Standard on housing dimensions for O-rings as in ISO 3601-1:2008 with or without anti-extrusion rings as in ISO 3601-4:2008. International and European Standards
10、referred to in this standard have been published as the corresponding DIN ISO or DIN EN ISO Standards with the same number. For ISO 5598, there is no national standard available. Amendments This standard differs from DIN 3771-5:1993-11 as follows: a) The housing dimensions correspond to O-rings for
11、industrial applications as specified in ISO 3601-1:2008. b) Permissible surface roughness values of the housings have been specified. c) The correlation of ISO 3601-1:2008 aerospace O-ring size identification code with EN 3748 O-ring housing codes is given in Annex A. Previous editions DIN 3771-5: 1
12、993-11 3 DIN ISO 3601-2:2010-08 Design criteria for standard O-ring applications”. Introduction In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pressure within an enclosed circuit. To avoid leakage or to seal different chambers of a component from ea
13、ch other sealing devices are used. O-rings are one type of sealing devices. To seal properly, an O-ring has to be used in an appropriate housing for the application. Annexes A and B of this part of ISO 3601 are for information only. Fluid power systems O-rings Part 2: Housing dimensions for general
14、applications 4 DIN ISO 3601-2:2010-08 1 Scope This part of ISO 3601 specifies the housing (gland) dimensions for class A O-rings for general industrial applications conforming to ISO 3601-1, as well as housing dimensions for class B O-rings used on selected metric-dimensioned hardware, e.g. fluid po
15、wer cylinder bores and piston rods. These O-rings are for use in general hydraulic and pneumatic applications without and with anti-extrusion rings (back-up rings). The dimensions of the O-rings (d1and d2), size codes (SC) and tolerances conform to ISO 3601-1. Housing dimensions for the O-rings inte
16、nded for aerospace applications that are specified in ISO 3601-1 are addressed in informative Annex A. NOTE 1 It is expected that O-ring housing dimensions for special applications be agreed upon between the O-ring manufacturer and the user. NOTE 2 The terms “housing”, “groove” and “gland” are inter
17、changeable, and their usage is a matter of local convenience. In this part of ISO 3601, the term “housing” is used exclusively. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For
18、undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3601-1:2008, Fluid power systems O-rings Part 1: Inside diameters, cross-sections, tolerances and designation codes ISO 3601-4, Fluid power systems O-rings Part 4: Anti-extrusion rings (back-up
19、rings) ISO 4287:1997, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters ISO 5598, Fluid power systems and components Vocabulary ISO 8015, Technical drawings Fundamental tolerancing principle 3 Terms and definitions For the purp
20、oses of this document, the terms and definitions given in ISO 5598 apply. 5 DIN ISO 3601-2:2010-08 4 Symbols The following letter symbols are used in this part of ISO 3601: Acs1cross-sectional area of the O-ring Acs2cross-sectional area of the O-ring housing a roughness of the side surface of the O-
21、ring housing bxwidth of the O-ring housing b1width of the O-ring housing without an anti-extrusion ring (back-up ring) b2width of the O-ring housing with one anti-extrusion ring (back-up ring) b3width of the O-ring housing with two anti-extrusion rings (back-up rings) b4width of the O-ring axial hou
22、sing C percentage of effective O-ring cross-section compression c roughness of the ground surface of the O-ring housing d roughness of the mating surface of the O-ring d1O-ring inside diameter d2O-ring cross-section diameter d3housing inside diameter for piston application d4bore diameter for piston
23、 application d5rod diameter d6housing outside diameter for rod application d7outside diameter of housing for axial sealing d8inside diameter of housing for axial sealing d9piston diameter d10bore diameter for rod application e surface roughness of lead-in chamfer F approximate percentage of housing
24、fill f housing radius (also known as edges of undefined shape) g extrusion gap h height of seal housing R percentage of O-ring cross-sectional reduction resulting from diametral stretch S percentage of inside diameter stretch SC O-ring size code from ISO 3601-1 t radial housing depth txapproximate r
25、adial housing depth Y maximum run-out tolerance z length of lead-in chamfer 6 DIN ISO 3601-2:2010-08 5 O-ring housings 5.1 Typical O-ring applications 5.1.1 Figure 1 shows a typical O-ring as presented in ISO 3601-1. Figure 1 Typical O-ring configuration 5.1.2 Figure 2 shows the features of an O-rin
26、g housing for use in dynamic rod and piston applications. Figure 2 Features of housings for dynamic rod and piston applications 7 DIN ISO 3601-2:2010-08 5.1.3 Figure 3 shows the features of O-ring housings used in static rod and piston applications. It also shows an example of a face (axial) seal. F
27、igure 3 Features of housings for static rod and piston applications 5.1.4 O-ring housings for face seal applications have different dimensional requirements depending upon whether the pressure is internal or external to the system. See Figure 4 for illustrations. 8 DIN ISO 3601-2:2010-08 Dimensions
28、in millimetres Key a, c surface roughness; see Table 6 b4bore diameter for piston application; see Table 6 f housing radius; see Table 6 aDirection of pressure. NOTE Tolerancing is in accordance with ISO 8015. Figure 4 Illustrations of housings for face seal applications 9 DIN ISO 3601-2:2010-08 5.1
29、.5 Figure 5 shows examples of widths of O-ring housings for use with or without anti-extrusion rings (back-up rings). Recommendations for the use of anti-extrusion rings are given in ISO 3601-4. a) Without anti-extrusion rings b) With one anti-extrusion ring c) With two anti-extrusion rings aPressur
30、e acting in one direction. bPressure acting in alternating directions. Figure 5 Widths of O-ring housings, for use with or without anti-extrusion rings (back-up rings) 5.2 Surface roughness 5.2.1 The surface roughness of the O-ring housing and any mating part has a significant impact on the life and
31、 sealing performance of the O-ring. 5.2.2 Unless otherwise agreed, surface roughness values shall be in accordance with Table 1. Surface roughness values of the housings for the O-rings intended for aerospace applications that are specified in ISO 3601-1 are addressed in informative Annex A. 5.2.3 U
32、nless otherwise agreed, the material ratio, Rmr, should be 50 % to 80 % for surfaces of mating parts, determined at a cut depth of C = 0,25 Rz, relative to a reference profile line of C0= 0,05 Rmr(see ISO 4287:1997, 4.5.2). 5.3 Housing dimensions 5.3.1 Figure 6 shows a cross-section of a typical pis
33、ton housing, illustrating the housing width, bx, housing height, h, the total distance between the sealing surface and the housing height, t, the gap between the sealing elements, g, the edges of undefined shape, f, and the surfaces for which surface roughness requirements are specified. All of thes
34、e features have different values depending on the application. 10 DIN ISO 3601-2:2010-08 Dimensions in millimetres Key 1 bore 2 piston a, c, d, e surface roughness; see Table 1 f housing radius; see Table 1 bxwidth of O-ring housing aNo burrs are permitted in this area; the edge shall be rounded. bH
35、ousing diameter d3u 50: maximum run-out tolerance Y = 0,025; housing diameter d3 50: maximum run-out tolerance Y = 0,05. NOTE Tolerancing is in accordance with ISO 8015. Figure 6 Dimensions of piston seal housings 11 DIN ISO 3601-2:2010-08 5.3.2 Figure 7 shows a cross-section of a typical rod housin
36、g, illustrating the housing width, bx, housing height, h, the total distance between the sealing surface and the housing height, t, the gap between the sealing elements, g, edges of undefined shape, f, and the surfaces for which surface roughness requirements are specified. All of these features hav
37、e different values depending on the application. Dimensions in millimetres Key 1 rod 2 bore a, c, d, e surface roughness; see Table 1 f housing radius; see Table 1 bxwidth of O-ring housing aNo burrs are permitted in this area; the edge shall be rounded. bHousing diameter d6u 50: maximum run-out tol
38、erance Y = 0,025; housing diameter d6 50: maximum run-out tolerance Y = 0,05. NOTE Tolerancing is in accordance with ISO 8015. Figure 7 Dimensions of rod seal housings 5.3.3 The latest International Standards for surface roughness measurement require new statements for roughness requirements. Becaus
39、e of the short measuring length, an exact roughness is not measurable. In these cases, a visual inspection using master parts is permitted. 5.4 Corners and edges of undefined shape Values for inside corner edge, f, that depend on the cross-sections of housings and rods are specified in Table 1. Valu
40、es for the undefined edge of the housing outside corner are specified in Figures 6 and 7. 12 DIN ISO 3601-2:2010-08 5.5 Lead-in chamfer 5.5.1 A lead-in chamfer with an angle of 15 to 20 shall be used to prevent damage to the O-ring by either the rod or the piston upon assembly into the cylinder bore
41、. Chamfer edges shall be rounded. Figures 6 and 7 illustrate lead-in chamfers for piston and rod housings, respectively. 5.5.2 Values for the lengths of lead-in chamfers, dimension z, for the cross-sections of housings and rods are specified in Table 1. 5.6 Calculation of housing dimensions for radi
42、al sealing applications 5.6.1 General For the basic dimensions of housings for O-rings, see Tables 2 through 5. Dimensions d3(for piston sealing applications) and d6(for rod sealing applications) and the depth of the housing apply if the percentage of effective O-ring cross-sectional compression is
43、within the limits given in Figure 8, depending on the application and O-ring cross-section. 13 DIN ISO 3601-2:2010-08 a) Hydraulic dynamic applications b) Pneumatic dynamic applications Figure 8 (continued) 14 DIN ISO 3601-2:2010-08 c) Hydraulic and pneumatic static applications d) Hydraulic and pne
44、umatic axial (face seal) applications Key d2O-ring cross-section, expressed in millimetres C compression, expressed in percent 1 minimum value 2 maximum value Figure 8 Limits of compression for ISO 3601-1 O-rings 15 DIN ISO 3601-2:2010-08 5.6.2 Percent effective compression, C 5.6.2.1 When an O-ring
45、 is stretched, its cross-section is reduced and flattened. When installed in the housing, the cross-section is no longer circular. The percentage that the cross-section is reduced depends on the percentage, S, that the inside diameter is stretched. For piston applications, S is calculated in accorda
46、nce with Equations (1) and (2): 3, min 1, maxmin1, m a x100ddSd=(1) 3, max 1, minmax1, m i n100ddSd=(2For rod applications, S is calculated in accordance with Equations (3) and (4): 5, min 1, maxmin1, m a x100ddSd=(3) 5, max 1, minmax1, m i n100ddSd=(45.6.2.2 The percent of cross-sectional reduction
47、 resulting from diametral stretch, R, for an O-ring whose inside diameter is stretched 0 % to 3 % (inclusive) is calculated in accordance with Equation (5): R = 0,01 + 1,06(S) 0,1(S)2(5) NOTE Equation (5) is also given in SAE MAP 3340. EXAMPLE For an O-ring whose inside diameter is stretched 2 %, th
48、e percent effective compression is R = 0,01 + 1,06(2) 0,1(4) = 1,73 % 5.6.2.3 The percent of cross-sectional reduction resulting from diametral stretch, R, for an O-ring whose inside diameter is stretched more than 3 % but less than 25 % is calculated in accordance with Equation (6): R = 0,56 + 0,59
49、(S) 0,0046(S)2(6) 5.6.2.4 The effective cross-section, d2*, range for the stretched O-ring is in accordance with Equations (7) and (8): *2, mind = d2, min (Rmax/ 100) d2, min(7) where Rmaxis calculated according to Equation (5) or Equation (6) using Smax. Use Smax. *2, maxd = d2, max (Rmin/ 100) d2, max(8) where Rminis calculated according to Equation (5) or Equation (6) using Smin. Use Smin. 16 DIN ISO 3601-2:2010-08 The range in the percent effective compression, C, is in accordance with Equat
