《BS-ISO-7425-2-1989.pdf》由会员分享，可在线阅读，更多相关《BS-ISO-7425-2-1989.pdf（12页珍藏版）》请在三一文库上搜索。
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
17、using radial depth s Axial length Rod diameter) Groove diameter d D f8*) tol. L + 0,25 0 r max. I 8 I l3 1 I IO I 15 I 2,5 22 l2l 12 3,75 3,2 2,5 22 14 3,75 32 I 16 I 23,5 I I 18 I 253 -1 20 5,5 4,2 3,75 22 5,5 4,2 O,5 Hg*) 3,75 3,2 I 28 I 39 I I 32 I 43 I I 36 I 47 I 5,5 412 51 I 45 I 56 I I 50 I 6
18、1 I 6,3 7,75 5,5 4,2 I 70 I 85,5 1 I 90 I 105,5 I I 100 I 115,5 I 7,75 6,3 110 125,5 125 Mo,5 I 140 I 155,5 I w 03 160 10,5 81 7,75 6,3 180 I 200 I 221 I I 220 l 241 I 10,5 &1 250 271 -0 304,5 320 344,5 380 3W5 r 1) Bore diameters in accordance with ISO 3320. 2) See ISO 286-2. 12,25 3 BS ISO 74252:2
19、002 3 BS ISO 74252:1989 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI National Annex NA (informative) Recommendations for surface texture NA.1 Sliding surfaces The surface texture of components which are in sliding contact with the seal sh
20、ould be 0.1?m to 0.4?m Ra and 1.6?m Rz max., when measured in accordance with BS 1134-11). The bearing ratio Rmr should be 50 % to 90 % at a depth of 25 % of Rz , from a reference line of 5 % bearing ratio. NA.2 Static surfaces The surface texture of components which are in static contact with the s
21、eal should be 0.4?m to 1.6?m Ra and 6.3?m Rz max., when measured in accordance with BS 1134-1. The bearing ratio Rmr should be 50 % to 90 % at a depth of 25 % of Rz, from a reference line of 5 % bearing ratio. 1) BS 1134-1:1998, Assessment of surface texture Part 1: Methods and instrumentation BS IS
22、O 74252:2002BS ISO 74252:1989 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 7425-2:1989 BSI 389 Chiswick High Road London W4
23、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
24、. 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. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the S
25、ecretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of
26、 standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-. In response to order
27、s for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library
28、 and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-. Subscribing members of BSI are kept u
29、p to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-. Information regarding online access to Bri
30、tish Standards via British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standard
31、ization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclu
32、de the free use, in the course of implementing the standard, of necessary details such as symbols, 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. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 07:00:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI