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1、BRITISH STANDARD BS 5751:1987 Specification for Dimensions of housings for hydraulic seals for reciprocating applications UDC 62-12:621.226:62-762.8 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 This British Standard, having b
2、een 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 July 1987 BSI 11-1999 First published June 1979 First revision July 1987 The following BSI references relate to the work on this sta
3、ndard: Committee reference MCE/11 Draft for comment 85/79151 DC ISBN 0 580 15950 7 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 followin
4、g bodies 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 Bri
5、tish Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 BSI 11-1999i Contents Page Com
6、mittees responsibleInside front cover Forewordii 1Scope1 2Letter symbols1 3Dimensions1 4Tolerances1 5Surface texture1 Appendix A Application guidance7 Figure 1 Examples of housings for piston seal2 Figure 2 Example of housing for rod seal4 Table 1 Nominal dimensions for piston seal housings (regular
7、 series)3 Table 2 Nominal dimensions for piston seal housings (special series)3 Table 3 Lead-in chamfer3 Table 4 Nominal dimensions for rod seal housings (regular series)5 Table 5 Nominal dimensions for rod seal housings (special series)6 Table 6 Seal space tolerances6 Publications referred toInside
8、 back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Machinery and Components Standards Committee and is a revision of BS 5751:197
9、9, which is withdrawn. It implements a draft revision of International Standard ISO 5597 being prepared by the International Organization for Standardization (ISO). It is intended that this British Standard should be adopted in the design of new hydraulic equipment; BS 1658 has been retained as an o
10、bsolescent standard for replacement purposes. The dimensions given in this British Standard, although providing the necessary basis for standardization in the manufacture and application of hydraulic seals, should not be regarded as providing all the information required for design purposes. For exa
11、mple, it is desirable to consult the seal manufacturer 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. Housings for two series of seal are covered by this British Standard. The regular serie
12、s, which was included in the 1979 edition, is intended for use in applications where there are no significant space limitations. The special series, which is introduced in this edition of the standard, has reduced cross-sectional dimensions and should be used after careful consideration has been giv
13、en to the design of the proposed installation. The regular series of seals is normally used in hydraulic cylinders manufactured in accordance with BS 6331-1, BS 6331-3 and BS 6331-4, while the special series was specifically introduced for use in the compact series of hydraulic cylinders specified i
14、n BS 6331-2, although its use in other applications is not excluded. The ranges of cylinder bore and piston rod diameters specified in this British Standard have been selected from BS 5755. A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
15、andards 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 and ii, pages 1 to 8, an inside back cover and a back cover. Thi
16、s 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 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 BSI 11-19991 1 S
17、cope This British Standard specifies the dimensions and associated tolerances for two series of hydraulic cylinder rod and piston seal housings for reciprocating 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. I
18、t does not give details of seal design, since the manner of construction of seals varies with each manufacturer. The design and material of the seal and any incorporated anti-extrusion feature will be determined by conditions such as temperature and pressure. Guidance on the application of this stan
19、dard is given in Appendix A. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Letter symbols 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
20、 1 and as given in Table 1, Table 2 and Table 3. The dimensions for rod seal housings shall be as shown in Figure 2 and as given in Table 3, Table 4 and Table 5. NOTEGuidance on the determination of the extrusion gaps, dimension P or J, is given in Appendix A. 3.2 Lead-in chamfer 3.2.1 The lead-in c
21、hamfer length, dimension C, shall be not less than that given in Table 3. The lead-in chamfer angle shall be not less than 20 or greater than 30 to the axis of the cylinder or rod. 3.2.2 In the case of special series seals, the end of the cylinder bore shall have a lead-in chamfer in accordance with
22、 3.2.1 or a 0.4 mm minimum radius. 4 Tolerances The component diametral tolerances shall be selected in such a manner that the seal housing radial space is within the limits given in Table 6. The tolerances of the housing axial length, L, shall be in accordance with Table 6. NOTEFormulae for calcula
23、ting the diametral tolerances to be applied to d (see Figure 1) or D (see Figure 2) are given in Table 6. 5 Surface texture 5.1 Sliding surfaces The surface texture of components that are in sliding contact with the seal shall not exceed 0.4 4m Ra and 1.6 4m Rz, when measured in accordance with BS 1
24、134-1. 5.2 Static surfaces The surface texture of components that are in relatively static contact with the seal shall not exceed 1.6 4m Ra and 6.3 4m Rz, when measured in accordance with BS 1134-1. 5.3 Exceptional conditions Exceptional service conditions may necessitate the selection of other grad
25、es of surface texture; reference should be made to BS 5242-1 for steel tubes and BS 5242-2 for non-ferrous tubes. Clead-in chamfer Lseal housing, axial length dseal housing, inside diameter (rod diameter or piston seal groove diameter) Dseal housing, outside diameter (bore diameter or rod seal groov
26、e diameter) Grod clearance diameter Jrod seal housing, clearance diameter Ppiston seal housing, clearance diameter Sseal housing, radial width, (D d)/2. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 2 BSI 11-1999 Figure 1 Exam
27、ples of housings for piston seal Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 BSI 11-19993 Table 1 Nominal dimensions for piston seal housings (regular series) Table 2 Nominal dimensions for piston seal housings (special seri
28、es) Table 3 Lead-in chamfer Bore diameter, D Nominal radial section, S Groove diameter, d Axial lengthFillet radius max. Bore diameter, D Nominal radial section, S Groove diameter, d Axial lengthFillet radius max. L1L2L3L1L2L3 mmmmmmmmmmmmmmmmmmmmmmmmmmmm 16485.06.3 0.3 100 7.5859.5 12.5 250.4 20412
29、5.06.3 0.3108012.5 16320.6 125 10 12.5 105 100 12.5 16 16 20 32 40 0.6 0.8 25 4 5 17 15 5.0 6.3 6.3 8 16 0.3 0.3 32 4245.06.3 0.3 160 1014012.5 16320.6 5226.3816 0.312.51351620400.8 40 4325.06.3 0.3 200 12.51751620400.8 5306.3816 0.3151702025500.8 50 5406.3816 0.3 250 12.52251620400.8 7.5359.5 12.5
30、25 0.4152202025500.8 63 5536.3816 0.3320152902025500.8 7.5489.5 12.5 25 0.4400203602532631.0 80 7.5659.5 12.5 25 0.4500204602532631.0 106012.5 1632 0.6 Bore diameter, D Nominal radial section, S Groove diameter, d Axial length, L Fillet radius max. mm 25 mm 3.5 mm 18 mm 5.6 mm 0.5 323.5255.60.5 4043
31、26.30.5 504426.30.5 634556.30.5 805707.50.5 1005907.50.5 1257.511010.60.5 1607.514510.60.5 2007.518510.60.5 Nominal radial section, S (in mm)3.5457.51012.51520 Minimum length of chamfer, C (in mm)222.5456.57.510 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontro
32、lled Copy, (c) BSI BS 5751:1987 4 BSI 11-1999 Figure 2 Example of housing for rod seal Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 BSI 11-19995 Table 4 Nominal dimensions for rod seal housings (regular series) Rod diameter,
33、d Nominal radial section, S Groove diameter, D Axial lengthFillet radius max. Rod diameter, d Nominal radial section, S Groove diameter, D Axial lengthFillet radius max. L1L2L3L1L2L3 mmmmmmmmmmmmmmmmmmmmmmmmmmmm 64145.06.3 14.5 0.3 56 7.5719.5 12.5 250.4 84165.06.3 14.5 0.3107616320.6 10 4185.06.3 1
34、4.5 0.3 63 7.5789.5 12.5 250.4 5208160.3108316320.6 12 4205.06.3 14.5 0.3 70 7.5859.5 12.5 250.4 5228160.3109016320.6 14 4225.06.3 14.5 0.3 80 7.5959.5 12.5 250.4 5248160.31010016320.6 16 4245.06.3 14.5 0.3 90 7.51059.5 12.5 250.4 5268160.31011016320.6 18 4265.06.3 14.5 0.3 100 1012012.5 16320.6 528
35、8160.312.512520400.8 20 4285.06.3 14.5 0.3 110 1013012.5 16320.6 5308160.312.513520400.8 22 4305.06.3 14.5 0.3 125 1014512.5 16320.6 5328160.312.515020400.8 25 4335.06.3 14.5 0.3 140 1016012.5 16320.6 5358160.312.516520400.8 28 5386.38160.3 160 12.51851620400.8 7.54312.5 250.41519025500.8 32 5426.38
36、160.3 180 12.52051620400.8 7.54712.5 250.41521025500.8 36 5466.38160.3 200 12.52251620400.8 7.55112.5 250.41523025500.8 40 5506.38160.3220152502025500.8 7.55512.5 250.4250152802025500.8 45 5556.38160.3280153102025500.8 7.56012.5 250.4320203602532631.0 50 5606.38160.3360204002532631.0 7.56512.5 250.4
37、 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 6 BSI 11-1999 Table 5 Nominal dimensions for rod seal housings (special series) Table 6 Seal space tolerances Rod diameter, d Nominal radial section, S Groove diameter, D Axial le
38、ngth, L Fillet radius max. mm 12 mm 3.5 mm 19 mm 5.6 mm 0.5 143.5215.60.5 183.5255.60.5 223.5295.60.5 284366.30.5 364446.30.5 454536.30.5 565667.50.5 705807.50.5 9051007.50.5 1107.512510.60.5 1407.515510.60.5 Nominal radial section Radial seal spaceHousing axial length (L) tolerance SmaxSmin mmmmmmm
39、m 3.5 4 5 7.5 10 12.5 15 20 3.65 4.15 5.15 7.70 10.25 12.80 15.35 20.40 3.45 3.95 4.90 7.40 9.90 12.35 14.80 19.80 NOTE 1For pistons. The tolerances on groove diameter d (see Figure 1) should in every case be calculated in accordance with the following equations: dmin= 2 Dmax Pmin 2 Smax dmax= Pmin
40、2 Smin In most cases, a limit of H9a on D and f8a on P will result in a tolerance approximating to h10a on d. Guidance on the selection of tolerance for the bores of cylinder barrels is given in BS 5242-1 for steel tubes and BS 5242-2 for non-ferrous tubes. NOTE 2For rods. The tolerances on groove d
41、iameter D (see Figure 2) should in every case be calculated in accordance with the following equations: Dmin= Gmax+ 2 Smin Dmax= 2 dmin Gmax+ 2 Smax In most cases, a limit of f8a on d and H9a on G will result in a tolerance approximating to H10a on D. NOTE 3General. Any relaxation of tolerances on o
42、ne housing component will necessitate compensating tighter tolerances on another component to maintain the required radial seal space limit. a Tolerance grades in accordance with BS 4500. +0.25 0 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) B
43、SI BS 5751:1987 BSI 11-19997 Appendix A Application guidance A.1 General Typical housings covered by this standard are illustrated in Figure 1 and Figure 2, but it should be noted that these figures are diagrammatic only and do not represent recommendations for the constructional features of housing
44、 design. It is recommended that the seal manufacturer is consulted on details of housing design that are not specified in this standard. A.2 Axial length For every nominal piston and rod diameter, a choice of axial length is included. Also, for most piston and rod diameters an alternative radial sec
45、tion width is given (the exceptions being at the upper and lower extremities of the range). Consultation is also recommended in making the appropriate selection from the choices available, but in general the wider cross section should be selected where higher stresses are involved. Normally the inte
46、rmediate and longest axial lengths of housing (L2 and L3) are suitable for accommodating “multi-lip” and “unit” seals respectively. The shorter axial length of housing (L1) is intended for non-arduous duties. A.3 Extrusion gap Dimensions P (see Figure 1) and J (see Figure 2) determine the extrusion
47、gap, the maximum value of which is achieved when the piston or piston rod is in contact with one side of the cylinder or bearing 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 select
48、ed after discussion between the housing designer and the seal manufacturer. The corners of supporting surfaces should provide the maximum support against extrusion but all sharp edges should be removed. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy
49、, (c) BSI 8 blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:31:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5751:1987 BSI 11-1999 Publications referred to BS 1134, Method for the assessment of surface texture. BS 1134-1, Method and instrumentation. BS 1658, Specification for housings for hydraulic seals for reciprocating applications1). BS 4500, ISO limits and fits. BS 5242, Tubes for fluid power cylinder barrels. BS 5242-1, Steel tubes with