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1、BRITISH STANDARD BS 6984:1988 Specification for Dimensions of housings for elastomer-energized plastic-faced hydraulic seals in reciprocating applications UDC 678.06:621 762:621.226:621.225.2 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
2、S 6984:1988 This British Standard, having been prepared under the direction of the Machinery and Components Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 January 1989 BSI 11-1999 The following BSI references relate to the work on this standard
3、: Committee reference MCE/11 Draft for comment 87/72481 DC ISBN 0 580 16655 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machinery and Components Standards Committee (MCE/-) to Technical Committee MCE/11, upon which the following bo
4、dies were represented: British Compressed Air Society British Fluid Power Association British Hydromechanics Research Association British Industrial Truck Association British Rubber Manufacturers Association Engineering Equipment and Materials Users Association Ministry of Defence Society of British
5、 Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 BSI 11-1999i Contents Page Committ
6、ees responsibleInside front cover Forewordii 1Scope1 2Letter symbols1 3Dimensions1 4Tolerances1 5Surface texture1 Appendix A Application guidance6 Figure 1 Dimensions of typical housings for piston seals2 Figure 2 Dimensions of typical housings for rod seals4 Table 1 Lead-in chamfer for piston seals
7、2 Table 2 Dimensions of housings for piston seals3 Table 3 Lead-in chamfer for rod seals4 Table 4 Dimensions of housings for rod seals5 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 ii
8、 BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Machinery and Components Standards Committee. It implements draft International Standards DIS 7425-11) and DIS 7425-21) prepared by the International Organization for Standardization (ISO). The dimensions given
9、for hydraulic seal housings in this British Standard, although providing the necessary basis for standardization in their manufacture and application, should not be regarded as providing all the information required for design purposes. It is for example very desirable to consult the seal manufactur
10、er on the disposition of the tolerances on the inner and outer diameters to ensure that proper interference is provided between the seal and its mating surface. The range of cylinder bore and piston rod diameters specified in this British Standard have been selected from BS 5755. A British Standard
11、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 i
12、nside front cover, pages i and ii, pages 1 to 6, 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. 1) In preparation. Licensed Copy: sheffieldun
13、 sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 BSI 11-19991 1 Scope This British Standard specifies the dimensions and associated tolerances of housings for a series of elastomer-energized plastic-faced hydraulic cylinder rod and piston seals for recipr
14、ocating applications in the following range of dimensions: a) for cylinders of diameter 16 mm to 500 mm; b) for rods of diameter 6 mm to 360 mm. Details of seal design are not given, since the manner of construction of seals varies with each manufacturer. The design and material of the seal and any
15、incorporated anti-extrusion feature will be determined by conditions such as extrusion gap, temperature and pressure. Guidance in the application of this standard is given in Appendix A. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Letter sym
16、bols Letter symbols used in this British Standard are as follows: 3 Dimensions 3.1 General The dimensions for piston seal housings shall be as shown in Figure 1 and as given in Table 2. The dimensions for rod seal housings shall be as shown in Figure 2 and as given in Table 4. NOTEGuidance on the de
17、termination of the extrusion gaps, dimensions P or J, is given in Appendix A. 3.2 Lead-in chamfer The lead-in chamfer length, dimension C, shall be not less than those given in Table 1 and Table 3 (see also A.3). The lead-in chamfer angle shall be not less than 20 or greater than 30 to the axis of t
18、he cylinder or rod. 4 Tolerances The diametral tolerances to be applied to diameter d and diameter D shall be within those given in Table 2 and Table 4. The tolerances of the housing axial length, dimension L, shall also be within those given in Table 2 and Table 4. 5 Surface texture 5.1 The surface
19、 texture of components which are in sliding contact with the seal shall be 0.1 4m to 0.4 4m Ra and 1.6 4m Rz max., when measured in accordance with BS 1134-1. 5.2 The surface texture of components which are in static contact with the seal shall be 0.4 4m to 1.6 4m Ra and 6.3 4m Rz max., when measure
20、d in accordance with BS 1134-1. NOTEExceptional service conditions may necessitate the selection of other grades of surface texture; reference should be made to BS 5242-1 for steel and BS 5242-2 for non-ferrous tubes. Clead-in chamfer, axial length Lseal housing, axial length dseal housing, inside d
21、iameter (rod diameter or piston seal groove diameter) Dseal housing, outside diameter (bore diameter or rod seal groove diameter) Jrod seal housing, clearance diameter Ppiston seal housing, clearance diameter Sseal housing, radial depth rgroove corner radius Dd 2 - - Licensed Copy: sheffieldun sheff
22、ieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 2 BSI 11-1999 Table 1 Lead-in chamfer for piston seals (see Figure 1) Figure 1 Dimensions of typical housings for piston seals Nominal radial section, S (mm)2.53.75 5.0 5.5 7.5 7.75 10.0 10.5 12.25 12.515.020.0 M
23、inimum length of chamfer, C (mm)1.522.5456.57.510 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 BSI 11-19993 Table 2 Dimensions of housings for piston seals Bore diameter, Nominal radial section, Groove diameter, Axial length
24、+ 0.2b Groove corner radius, D (H9a)Sd (h9a) L1 (without back-up rings) L2 (with back-up rings) r max. mmmmmmmmmmmm 162.5112.2 0.5 3.758.53.2 202.5152.2 3.7512.53.2 253.7517.53.2 5.5144.2 5.0155.08.0 323.7524.53.2 5.5214.2 5.0225.08.0 403.7532.53.2 5.5294.2 5.0305.08.0 505.5394.2 7.7534.56.3 7.5357.
25、512.5 635.5524.2 7.7547.56.3 7.5487.512.5 805.5694.2 0.9 7.7564.56.3 10.06010.016.0 1005.5894.2 7.7584.56.3 10.08010.016.0 1257.75109.56.3 10.51048.1 10.010510.016.0 1607.75144.56.3 10.51398.1 12.513512.520.0 2007.75184.56.3 10.51798.1 12.517512.520.0 25010.52298.1 12.25225.58.1 15.022015.025.0 3201
26、0.52998.1 12.25295.58.1 15.029015.025.0 40012.25375.58.1 15.037012.5 20.036020.032.0 50012.25475.58.1 15.047012.5 20.046020.032.0 a Tolerance grades in accordance with BS 4500. b See guidance in A.2. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (
27、c) BSI BS 6984:1988 4 BSI 11-1999 Table 3 Lead-in chamfer for rod seals (see Figure 2) Figure 2 Dimensions of typical housings for rod seals Nominal radial section, S (mm)2.53.755.57.7510.512.25 Minimum length of chamfer, C (mm)1.52.02.54.05.06.5 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 0
28、5 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 BSI 11-19995 Table 4 Dimensions of housings for rod seals Rod diameter, GrooveNominal radial section, Axial length, L Groove corner radius, d (f8a) Diameter, DTolerance gradeaS r max. mmmmmmmmmm 611 H9 2.52.2 0.5 8132.52.2 10152.52.2
29、 12172.52.2 1219.53.753.2 14192.52.2 1421.53.753.2 1623.53.753.2 1825.53.753.2 2027.53.753.2 20315.54.2 2229.53.753.2 22335.54.2 2532.53.753.2 25365.54.2 28395.54.2 32435.54.2 36475.54.2 40515.54.2 45565.54.2 50615.54.2 56675.54.2 5671.57.756.3 63745.54.2 6378.57.756.3 0.9 7085.57.756.3 8095.57.756.
30、3 90105.57.756.3 100115.57.756.3 110125.5 H8 7.756.3 125140.57.756.3 140155.57.756.3 160175.57.756.3 16018110.58.1 180195.57.756.3 18020110.58.1 20022110.58.1 22024110.58.1 25027110.58.1 280304.512.258.1 320344.512.258.1 360384.512.258.1 a Tolerance grades in accordance with BS 4500. +0.25 0 License
31、d Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 6 BSI 11-1999 Appendix A Application guidance A.1 General A.1.1 Typical housings covered by this British Standard are illustrated in Figure 1 and Figure 2, but it should be noted that the
32、se figures are typical only and do not represent recommendations for the constructional features of housing design. However, this type of seal is frequently used in tandem for certain single acting applications. It is recommended that the seal manufacturer should be consulted on details of housing d
33、esign which are not specified in this British Standard. A.1.2 For the piston diameters and the rod diameters given in Table 2 and Table 4 respectively there are choices of cross section (S) and axial length (L). Consultation is recommended in making the appropriate selection from the choices availab
34、le, but in general a wider cross section should be selected where higher stresses are involved. Where the extrusion gap exceeds the capabilities of piston seals to bridge that gap, the longer axial length, L2, should be provided and back-up rings (anti-extrusion rings) also should be used. Similar c
35、onsiderations apply to rod seals. A.2 Extrusion gap The clearance diameters P (see Figure 1) and J (see Figure 2) and a lack of coaxiality of components determine the extrusion gap, the maximum value of which is achieved when the piston or piston rod is in contact with one side of the cylinder or be
36、aring respectively. The extrusion gap for piston seals is further increased by the expansion of the cylinder that occurs when under pressure. Dimensions P and J should be selected after discussion between the housing designer and the seal manufacturer. The corners of supporting surfaces should provi
37、de the maximum support against extrusion but all sharp edges should be removed. A.3 Lead-in chamfer To protect the seal from damage during assembly the length and angle of the lead-in chamfers specified in 3.2 are essential, either as an integral part of the housing assembly components or on separat
38、e assembly tools. The location and dimensions of the chamfers are shown in Figure 1 and Figure 2 and in Table 1 and Table 3. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 BSI 11-1999 Publications referred to BS 1134, Assessmen
39、t of surface texture. BS 1134-1, Methods and instrumentation. BS 4500, ISO limits and fits. BS 5242, Tubes for fluid power cylinder barrels. BS 5242-1, Specification for steel tubes with specially finished surfaces. BS 5242-2, Specification for non-ferrous metallic tubes with specially finished bore
40、s. BS 5755, Specification for dimensions of basic features of fluid power cylinders2). 2) Referred to in the foreword only. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6984:1988 BSI 389 Chiswick High Road London W4 4AL BSI British Sta
41、ndards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British
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49、bols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
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