ISO 9206:2018

INTERNATIONAL ISO
STANDARD 9206
Third edition
2018-12
Aerospace — Fixed displacement
hydraulic motors — General
specifications
Aéronautique et espace — Moteurs hydrauliques à cylindrée fixe —
Spécifications générales
Reference number
©
ISO 2018
© ISO 2018
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Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 6
5 General requirements . 6
5.1 Order of precedence . 6
5.2 Hydraulic system characteristics . 7
5.3 Airworthiness regulations . 7
5.4 Qualification . 7
6 Functional requirements . 7
6.1 Hydraulic fluid . 7
6.2 Pressures . 7
6.2.1 Rated supply pressure. 7
6.2.2 Rated differential pressure . 7
6.2.3 No-load break-out pressure . 8
6.2.4 Motor outlet port pressure . 8
6.2.5 Case drain pressure . 8
6.3 Flows . 8
6.3.1 Rated consumption . 8
6.3.2 Case drain flow . 8
6.3.3 Shaft seal leakage flow . 8
6.3.4 External leakage . 9
6.4 Speed and direction of rotation . 9
6.4.1 Speed . 9
6.5 Torque .12
6.5.1 Rated torque .12
6.5.2 Break-out torque .12
6.5.3 Stalling torque .12
6.5.4 Torque pulsations .12
6.6 Motor overall efficiency .12
6.7 Dynamic characteristics .12
6.7.1 General.12
6.7.2 Dynamic braking .12
6.7.3 Rapid reversals .13
6.8 Passive operation .13
6.9 Rated temperature .13
6.10 Acoustic noise level .13
6.11 Rated endurance .13
6.12 Environmental requirements .14
7 Detail design requirements .14
7.1 Dimensionally critical components .14
7.2 Maintainability features .14
7.3 Seals .14
7.4 Lubrication .15
7.5 Balance .15
7.6 Self-contained failure .15
7.7 Safety wire sealing .15
7.8 Electro-conductive bonding .15
7.9 Marking .15
7.9.1 Nameplate .15
7.9.2 Fluid identification .16
7.9.3 Ports .16
8 Strength requirements .16
8.1 General .16
8.2 Proof pressure .16
8.2.1 Motor case .16
8.2.2 Motor inlet port .16
8.2.3 Motor outlet port .16
8.3 Ultimate pressure .17
8.3.1 Motor case .17
8.3.2 Motor inlet port .17
8.3.3 Motor outlet port .17
8.4 Pressure impulse (fatigue) .17
8.5 Port strength .17
9 Construction requirements .17
9.1 Materials .17
9.1.1 General.17
9.1.2 Metals .18
9.2 Corrosion protection .18
9.2.1 General.
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