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BS EN 4854-3:2019

BS EN 4854-3:2019

$189.07

Aerospace series. Bearing, spherical plain, in corrosion resisting steel with self-lubricating liner, low starting torque and low friction coefficient, elevated duty cycles under low oscillations at different operating conditions – Technical specification

Published By Publication Date Number of Pages
BSI 2019 46
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This European Standard specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for spherical plain bearings in corrosion resisting steel with self-lubricating liner, low starting torque and low friction coefficient, elevated duty cycles under low oscillations at different operating conditions.

This standard applies whenever referenced.

These self-lubricating spherical plain bearings are intended for use in fixed or moving parts of the aircraft structure especially for control mechanism and operating systems. The bearings are designed subjected under low dynamic radial loads and slow rotations in the temperature range of −55 °C to 120 °C (−67 °F to 248 °F).

The liner may be of a fabric or composite material bonded to the inside diameter of the outer ring or in a composite material moulded into a pre-formed cavity between the inner and outer rings.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
2 Normative references
8 3 Terms and definitions
11 4 Requirements, inspection and test methods
22 5 Quality management system
5.1 Product qualification
5.2 Acceptance conditions
5.2.1 Inspections and tests to be carried out by the manufacturer
5.2.2 User’s quality control
23 6 Packaging
7 Certificate of conformity
28 Annex A (normative)Verification of permissible and ultimate static loads (Cs, Ca)
A.1 Permissible radial loads (Cs)
A.1.1 Principle
A.1.2 Method
A.2 Ultimate radial static load
A.2.1 Principle
A.2.2 Method
29 A.3 Permissible axial static load (Ca)
A.3.1 Principle
A.3.2 Method
A.4 Ultimate axial static load
A.4.1 Principle
A.4.2 Method
32 Annex B (normative)Verification of dynamic radial loads (Cdyn)
B.1 Principle
33 B.2 Verification
B.2.1 High and medium surface pressure tests
B.2.1.1 Testing under various environmental conditions at 100 % Cdyn
B.2.1.2 Testing under various environmental conditions at 50 % Cdyn
B.2.2 Low surface pressure tests
B.2.2.1 Testing under various environmental conditions at 5 MPa
B.2.2.2 Testing under various environmental conditions at 3 MPa
B.2.2.3 Testing under various environmental conditions at 1 MPa
34 B.2.3 Test sequence
35 B.2.3.1 General
B.2.3.2 Method
39 Annex C (normative)Fluids — Essential characteristics
C.1 Cleaning agent
C.2 De-icing and anti-icing fluids
C.3 Mineral fluid for hydraulic transmission
C.4 Phosphate ester hydraulic fluid
C.5 Fuel for turbine engine
C.6 Silicon fluid Wacker AK 10
40 C.7 Salt laden atmosphere
41 Annex D (normative)Peeling strength and bond integrity
D.1 Peeling strength
D.1.1 Principle
D.1.2 Method
42 D.2 Bond integrity
D.2.1 Peelable liner types
D.2.2 Non-peelable liner types
43 Annex E (normative)Friction coefficient

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BS EN 4854-3:2019
$189.07