BS-ISO-7425-2-1989.pdf
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1、BRITISH STANDARD BS ISO 7425-2:1989 Hydraulic fluid power Housings for elastomer-energized, plastic-faced seals Dimensions and tolerances Part 2: Rod seal housings ICS 23.100.99 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7425-2
2、:1989 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 28 August 2002 BSI 28 August 2002 ISBN 0 580 40300 9 National foreword This British Stand
3、ard reproduces verbatim ISO 7425-2:1989 and implements it as the UK national standard. Together with BS ISO 7425-1:1988 it supersedes BS 6984:1988 which is with drawn. The UK participation in its preparation was entrusted to Technical Committee MCE/11, Fluid seals and housings, which has the respons
4、ibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International St
5、andards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for their correct application. Compliance with a British Sta
6、ndard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Europ
7、ean developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 3, the National Annex page, an inside back cover and a back cover The BSI copyright date displayed in this doc
8、ument indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 7425-2 First edition 1989-12-01 Hydraulic fluid power - H
9、ousings for elastomer-energized, plastic-faced Seals - Dimensions and tolerantes - Part 2 : Rod seal housings Transmissions h ydrauliques - L ogemen ts pour join ts en des mati however, consultation with the manufacturer is recommended when making the appropriate selection. 6 Dimensions and tolerant
10、es Seal housing dimensions and tolerantes shall be selected from table 2. 7 Extrusion gap 7.1 The extrusion gap is determined by the differente be- tween diameters d4 and d and by any lack of coaxiality of the housing components. NOTE - Maximum value is achieved when the Piston rod is in contact wit
11、h one side of the bearing. 7.2 lt is recommended that details concerning the extrusion gap and need for any anti-extrusion devices be the subject of consultation between the housing designer and seal manufac- turer. 8 Surface roughness The requirements for the surface roughness of the components in
12、contact with the seal are dependent on the application and Pressu re its life requirement and should be subject to agreement be- tween manufacturer and User. 9 Lead-in chamfer 9.1 To protect the seal from darnage during assembly, lead-in chamfers are required, either as an integral part of the rod e
13、nd or on a separate assembly tool. 9.2 Reference shall be made to figure 1 for typical location of lead-in chamfer when these are part of the rod end. 9.3 The minimum length of lead-in chamfers, whether on the rod end or assembly tool, is given in table 1. Table 1 - Lead-in chamfer Dimensions in mil
14、limetres Radial depth of seal housing (cross- section), S nom. 2,5 3,75 5,5 7,75 10,5 12,25 Minimum length of chamfer, C 1,5 2 2,5 4 5 6,5 10 Identification Statement (Reference to this part of ISO 7425) Use the following Statement in test reports, catalogues and sales Iiterature when electing to co
15、mply with this part of ISO 7425: “Dimensions and tolerantes for hydraulic cylinder rod seal housings selected in accordance with ISO 7425-2, Hydraulic fluid power - Housings for elastomer-energized, plastic-faced Seals - Dimensions and tolerantes - Part 2: Rod Seal housings. ” See 5.1.2 Burr-free *)
16、 See clause 7. Figure 1 - Example of rod seal housing BS ISO 74252:2002 2 BS ISO 74252:1989 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI OSI 25247 : 9891 lE( Table 2 - Dimensions and tolerantes of seal housing Dimensions in millimetres Ho
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