BS IS0 22181:2021 BSl Standards Publication Aerospace fluid systems and components - Variable displacement hydraulic motors General specifications bsi. BSISO22181:2021 BRITISH STANDARD Nationalforeword ThisBritish Standard is theUK implementation of IS022181:2021. TheUKparticipationinitspreparationwas entrustedto Technical CommitteeACE/69,Aerospacehydraulic systems,fluids andcomponents. A list of organizations represented on this committee can be obtained on requestto its committeemanager. This publication does not purport to include all the necessary provisions ofa contract.Users areresponsiblefor its correctapplication. @TheBritishStandards Institution2021 Published byBSI Standards Limited 2021 ISBN9780539038545 ICS 49.080 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the StandardsPolicyand Strategy Committeeon28February2021. Amendments/corrigendaissuedsincepublication Date Textaffected BS ISO 22181:2021 ISO INTERNATIONAL STANDARD 22181 First edition 2021-02 Aerospace fluid systems and components - Variable displacement hydraulic motors General specifications Reference number ISO 22181:2021(E) ISO @IS0 2021 BSISO22181:2021 IS0 22181:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i:Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+4122.749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved BSISO22181:2021 IS0 22181:2021(E) Contents Page Foreword ..vi Introduction. ..vii 1 Scope. 2 Normative references 3 Terms and definitions 4 Classification .1 5 General requirements 5.1 Order of precedence. .7 5.2 Hydraulic system characteristics .7 5.3 Airworthiness regulations .8 5.4 Qualification .8 6 Functional requirements. ..8 6.1 Hydraulic fluid. .8 6.2 Pressures.. ..8 6.2.1 Rated supply pressure. .8 6.2.2 Rated differential pressure .8 6.2.3 No-load break-out pressure .8 6.2.4 Motor return port pressure .9 6.2.5 Case drain pressure. 9 6.3 Flows. .9 6.3.1 Rated consumption. .9 6.3.2 Case drain flow. 9 6.3.3 Shaft seal leakage .10 6.3.4 External leakage .10 6.4 Speed and direction of rotation .10 6.4.1 Speed. .10 6.5 Torque. .11 Rated torque 6.5.1 .11 6.5.2 Break-out torque. .11 6.5.3 Stalling torque .11 6.5.4 Maximum stalling torque .11 6.5.5 Torque pulsations .11 6.6 Variable output ioad control .11 6.6.1 General. ..11 6.6.2 Responsetime .12 .12 6.6.3 Stability 6.7 Motor overall efficiency .12 6.8 Dynamic characteristics .13 6.8.1 General. .13 6.8.2 Dynamic braking .13 6.8.3 Rapid reversals. .13 6.9 Passive operation .13 6.10 Fluid and ambienttemperature .13 6.10.1 Fluid temperature .13 6.10.2 Ambienttemperature. ..13 6.11 Acoustic noise level. ..14 6.12 Rated endurance. ..14 6.13 Environmental requirements. .14 7 Detail design requirements ..15 7.1 Dimensionally critical components. .15 7.2 Maintainabilityfeatures. .15 7.3 Seals. .15 @IS0 2021-All rights reserved ili BSISO22181:2021 IS022181:2021(E) 7.4 Lubrication 15 7.5 Balance. 15 7.6 Self-contained failure 16 7.7 Safety wire sealing 16 7.8 Electro-conductive bonding 16 7.9 Marking 16 7.9.1 Nameplate. 16 7.9.2 Modification standard 16 7.9.3 Fluid identification 16 7.9.4 Ports. 16 8 Strength requirements .17 8.1 General. 17 8.2 Proof pressure 17 8.2.1 Motor case 17 8.2.2 Motor inlet port 17 8.2.3 Motor return port 17 8.3 Ultimate pressure 17 8.3.1 Motor case 17 8.3.2 Motor inlet port 17 8.3.3 Motor return port. 17 8.4 Pressure impulse (fatigue) 17 8.5 Port strength 18 9 Construction requirements 18 9.1 Materials 18 9.1.1 General. 18 9.1.2 Metals 18 9.2 Corrosion protection. 18 9.2.1 General.