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BS ISO 22181:2021

BS ISO 22181:2021

$189.07

Aerospace fluid systems and components. Variable displacement hydraulic motors. General specifications

Published By Publication Date Number of Pages
BSI 2021 50
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This document establishes the general requirements for variable displacement uni-directional and bi-directional hydraulic motors, suitable for use in aircraft hydraulic systems at pressures up to 35 000 kPa (5 000 psi).

These requirements include:

  • design requirements;

  • test requirements.

Primary and secondary function motors (see Clause 4) are covered in this document; however, actuators with internal rotation angle limits and low-speed motors are not covered.

This document is intended to be used in conjunction with the detail specification that is particular to each application.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 Foreword
9 Introduction
11 1 Scope
2 Normative references
12 3 Terms and definitions
17 4 Classification
5 General requirements
5.1 Order of precedence
5.2 Hydraulic system characteristics
18 5.3 Airworthiness regulations
5.4 Qualification
6 Functional requirements
6.1 Hydraulic fluid
6.2 Pressures
6.2.1 Rated supply pressure
6.2.2 Rated differential pressure
6.2.3 No-load break-out pressure
19 6.2.4 Motor return port pressure
6.2.5 Case drain pressure
6.3 Flows
6.3.1 Rated consumption
6.3.2 Case drain flow
20 6.3.3 Shaft seal leakage
6.3.4 External leakage
6.4 Speed and direction of rotation
6.4.1 Speed
21 6.5 Torque
6.5.1 Rated torque
6.5.2 Break-out torque
6.5.3 Stalling torque
6.5.4 Maximum stalling torque
6.5.5 Torque pulsations
6.6 Variable output load control
6.6.1 General
22 6.6.2 Response time
6.6.3 Stability
6.7 Motor overall efficiency
23 6.8 Dynamic characteristics
6.8.1 General
6.8.2 Dynamic braking
6.8.3 Rapid reversals
6.9 Passive operation
6.10 Fluid and ambient temperature
6.10.1 Fluid temperature
6.10.2 Ambient temperature
24 6.11 Acoustic noise level
6.12 Rated endurance
6.13 Environmental requirements
25 7 Detail design requirements
7.1 Dimensionally critical components
7.2 Maintainability features
7.3 Seals
7.4 Lubrication
7.5 Balance
26 7.6 Self-contained failure
7.7 Safety wire sealing
7.8 Electro-conductive bonding
7.9 Marking
7.9.1 Nameplate
7.9.2 Modification standard
7.9.3 Fluid identification
7.9.4 Ports
27 8 Strength requirements
8.1 General
8.2 Proof pressure
8.2.1 Motor case
8.2.2 Motor inlet port
8.2.3 Motor return port
8.3 Ultimate pressure
8.3.1 Motor case
8.3.2 Motor inlet port
8.3.3 Motor return port
8.4 Pressure impulse (fatigue)
28 8.5 Port strength
9 Construction requirements
9.1 Materials
9.1.1 General
9.1.2 Metals
9.2 Corrosion protection
9.2.1 General
29 9.2.2 Ferrous and copper alloys
9.2.3 Aluminium alloys
9.3 Castings
10 Installation requirements
10.1 Dimensions
10.2 Mass
30 10.3 Mounting
10.4 Orientation
10.5 Drive shaft
10.6 Ports
31 11 Maintenance requirements
11.1 Maintenance concept
11.2 Service life limitations and storage specifications
12 Reliability requirements
12.1 Equipment compliance
12.2 Requirements
13 Quality assurance provisions
13.1 Responsibility for inspection
13.2 Classification of tests
32 13.3 Test stand requirements
14 Acceptance tests
14.1 General
14.2 Examination of the product
33 14.3 Test programme
14.3.1 General
14.3.2 External leakage requirements
14.3.3 Break-in run
14.3.4 Proof pressure and overspeed tests
34 14.3.5 Operational tests at rated conditions
14.3.6 Break-out torque test
14.3.7 Teardown inspection examination
35 14.3.8 Run-in
14.3.9 Speed control test
14.3.10 Performance data
36 14.3.11 Fluid contamination test
37 14.4 Storage and packaging
15 Qualification procedures
15.1 General
15.2 Qualification procedure
15.2.1 Qualification by analogy
15.2.2 Motor qualification test report
15.2.3 Samples and program of qualification tests
38 15.3 Qualification testing
15.3.1 Dimensional check
15.3.2 Expanded envelope acceptance tests
15.3.3 Overspeed test
39 15.3.4 Operational test at overpressure
15.3.5 Calibration
41 15.3.6 Endurance testing
44 15.3.7 Environmental tests
45 15.3.8 Structural tests
47 15.3.9 Combination tests
15.3.10 Supplementary tests
48 Bibliography

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BS ISO 22181:2021
$189.07