BS-6852-1987.pdf

BRITISH STANDARD BS 6852:1987 Specification for Dimensions of housings for hydraulic cylinder piston rod wiper rings in reciprocating applications UDC 621.81.032:621.226-21:62-242.4 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 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 July 1987 © BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference MCE/11 Draft for comment 85/78827 DC ISBN 0 580 15951 5 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 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 British 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 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 © BSI 12-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Letter symbols1 4Dimensions and tolerances1 5Surface texture1 Figure 1 Example of housing for type A wiper ring2 Figure 2 Example of housing for type B wiper ring4 Figure 3 Example of housing for type C wiper ring6 Table 1 Dimensions of housings for type A wiper rings3 Table 2 Dimensions of housings for type B wiper rings5 Table 3 Dimensions of housings for type C wiper rings6 Table 4 Dimensions of piston rod lead-in chamfer6 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 ii © BSI 12-1999 Foreword This British Standard has been prepared under the direction of the Machinery and Components Standards Committee and is technically equivalent to ISO 6195:1986, published by the International Organization for Standardization (ISO). Housings for three types of wiper ring are specified in this British Standard. Type A and B rings are intended for use in applications where there are no significant space limitations, while type C rings have reduced cross-sectional dimensions. The wiper ring manufacturer should be consulted on the suitability of a particular type of ring for the application; this is particularly important in the case of type C wiper rings. The ranges of 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 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 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. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 © BSI 12-19991 1 Scope This British Standard specifies dimensions and tolerances of housings for wiper rings used in reciprocating rod applications for hydraulic fluid power cylinders. The range of rod sizes is from 6 mm to 360 mm diameter inclusive. It includes the following three types of housing design. Type A: recessed housing with an undercut, or separate cover, to retain a non-metallic wiper ring. Type B: open recessed housing for a wiper ring having integral rigid reinforcement, and which is a press-fit in the housing. Type C: recessed housing with an undercut to retain a non-metallic wiper ring having a reduced cross section. This British Standard does not specify the style, configurations, materials or performance rating for the wiper ring. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definition applies. wiper ring a device used to prevent ingress of contaminants and thereby protect the seals and bearings within a fluid power cylinder 3 Letter symbols Letter symbols used in this British Standard are as follows: 4 Dimensions and tolerances 4.1 General All sharp edges and burrs shall be removed from corners of supporting surfaces and rounded to within the tolerances specified in Table 1, Table 2 and Table 3. 4.2 Housing 4.2.1 Type A. The dimensions and tolerances for type A housings shall be as given in Table 1 and as illustrated in the example in Figure 1. 4.2.2 Type B. The dimensions and tolerances for type B housings shall be as given in Table 2 and as illustrated in the example in Figure 2. 4.2.3 Type C. The dimensions and tolerances for type C housings shall be as given in Table 3 and as illustrated in the example in Figure 3. 4.3 Lead-in chamfer The lead-in chamfer on the piston rod shall be as illustrated in Figure 1, Figure 2 and Figure 3, and its axial length C shall be not less than the appropriate dimension given in Table 4. 5 Surface texture 5.1 Piston rod The surface texture of the piston rod shall be that specified for the related rod seal, e.g. BS 5751. 5.2 Housing The surface texture of the other housing surfaces shall not exceed 32 4m Ra when measured in accordance with BS 1134-1. drod diameter D1outside diameter of the wiper housing D2retainer diameter Caxial length of the lead-in chamfer L1axial length of the wiper housing L2maximum length of the wiper Sradial depth (cross section) of the housing, (D1 d)/2 rradius. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 2 © BSI 12-1999 Figure 1 Example of housing for type A wiper ring Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 © BSI 12-19993 Table 1 Dimensions of housings for type A wiper rings (in mm) Rod diametera, d Radial depth, S Outside diameter, D1 H11 Axial length, L1 Wiper length, L2 max. Retainer diameter, D2 H11 r1 max.r2a max. 6 8 10 12 14 16 18 20 22 25 28 32 36 40 45 50 4 14 16 18 20 22 24 26 28 30 33 36 40 44 48 53 58 8 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 30.5 33.5 37.5 41.5 45.5 50.5 55.5 0.3 0.5 56 63 70 80 90 5 66 73 80 90 100 1063 70 77 87 97 0.4 100 110 125 140 160 180 200 7.5 115 125 140 155 175 195 215 14 110 120 135 150 170 190 210 0.6 220 250 280 320 360 10 240 270 300 340 380 18 233.5 263.5 293.5 333.5 373.5 0.80.9 a These specific dimensions permit the use of tools complying with BS 4193-2. 5+0.2 0 6.3+0.2 0 9.5+0.3 0 12.5+0.3 0 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 4 © BSI 12-1999 Figure 2 Example of housing for type B wiper ring Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 © BSI 12-19995 Table 2 Dimensions of housings for type B wiper rings (in mm) Rod diameter, d Radial depth, S Outside diameter, D1 H8 Axial length, L1 Wiper length, L2 max. 6 8 10 4 14 16 18 58 12 14 16 18 20 22 25 28 32 36 40 45 50 56 63 70 80 90 5 22 24 26 28 30 32 35 38 42 46 50 55 60 66 73 80 90 100 711 100 110 125 140 160 180 200 7.5 115 125 140 155 175 195 215 913 220 250 280 320 360 10 240 270 300 340 380 1216 +0.5 0 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 6 © BSI 12-1999 Table 3 Dimensions of housings for type C wiper rings (in mm) Table 4 Dimensions of piston rod lead-in chamfer (in mm) Figure 3 Example of housing for type C wiper ring Rod diameter, d Radial depth, S Outside diameter, D1 H11 Axial length, L1 Wiper length, L2 max. Retainer diameter, D2 H11 r1 max. 12 14 18 22 3 18 20 24 28 7 14.5 16.5 20.5 24.5 28 36 45 4 36 44 53 8 31 39 48 0.3 56 70 90 5 66 80 100 9.759 73 93 110 140 7.5 125 155 13.0 114 144 0.4 Radial depth of the housing, S3457.510 Minimum axial length of lead-in chamfer, C222.545 4+0.2 0 5+0.2 0 6+0.2 0 8.5+0.3 0 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 © BSI 12-1999 Publications referred to BS 1134, Method for the assessment of surface texture. BS 1134-1, Method and instrumentation. BS 4193, Hardmetal insert tooling. BS 4193-2, Specification for dimensions for indexable hardmetal (carbide) inserts with rounded corners, without fixing hole. BS 5751, Specification for dimensions of housings for hydraulic seals for reciprocating applications. BS 5755, Specification for dimensions of basic features of fluid power cylinders1). ISO 6195, Fluid power systems and components Cylinders Housings for rod wiper rings in reciprocating applications Dimensions and tolerances1). 1) Referred to in the foreword only. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:51:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6852:1987 BSI 389 Chiswick High Road London W4 4AL BSI British Standards 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 Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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