BS EN 2755:2009 pdf free download – Aerospace series – Bearings, spherical plain in corrosion resisting steel with self-lubricating liner- Elevated load at ambient temperature一 Technical specification.
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace
standard parts
EN 10204, Metallic products — Types of inspection documents
ISO 11078, Aircraft — De-icing/anti-icing fluids, ISO type II, Ill and IV
TR 4475, Aerospace series — Bearings and mechanical transmissions for airframe applications — Vocabulary 2
3 Terms and definitions
For the purposes of this document, the terms and definitions given in TR 4475 and the following apply.
3.1
spherical plain bearings with self-lubricating liner
spherical plain bearing consisting of two concentric rings between which is interposed a self-lubricating liner which is bonded or moulded onto the spherical inner surface or the spherical outer surface
3.2 Surface discontinuities
3.2.1
score, scratch
open surface defect
3.2.2
lap
surface defect where particles of metal or sharp edges are folded over and then rolled or forged into the surtace
3.2.3
seam
unwelded fold which appears as an open defect in the material
3.3
starting torque at without load
torque required to start the rotation of the inner with the outer ring held stationary
3.4 Permissible static loads
3.4.1
radial
Cs
static load corresponding to a permissible unit pressure multiplied by the effective projected area in the radial direction, the inner ring being able to take any position within the limits of the tilting angle indicated in the product standard
3.4.2
axial
Ca
static load corresponding to a permissible unit pressure multiplied by the effective projected area in the axial direction
3.5
dynamic radial
C25
load which may be withstood by a bearing submitted to an oscillatory movement for a defined number and frequency of oscillation cycles without the dimensional or other characteristics deviating from the values permitted by the technical specification of the product
NOTE One oscillating cycle includes an angular displacement of the inner ring in relation to the outer ring from 0° to 25° then from 25° to — 25° and finally from — 25° to 0°.
3.6
adhesion of the liner
area where the adhesive bond is broken, or non existent, leaving a smooth and clean interface on the metallic surface
3.7
production batch
batch of products composed of elements which may come from more than one element batch but which are assembled in the same production series
4 Requirements characteristics, inspection and test method
See Table 1.
6 Packaging
The bearings shall be packaged either individually or in rolls so that they will not be damaged during transportation.
They shall be protected against moisture, corrosion, dirt and other harmful substances.
The packaging material in contact with these bearings shall provide this protection.
The following indications shall appear on each individual package:
manufacturer’s name and address;
-quantity for rolls;
-identity block as defined by the product standard or the design documentation;
-packaging date.
At least the following indications shall appear on collective packaging:
一manufacturer’s name and address;
-number of order;
-quantity;
-identity block(s) as defined by the product standard or design documentation.