BS EN 2017-1989 pdf free download.Specification for Bearings-airframe rolling double row self aligning ball bearings in corrosion resisting steel diameter series 2 — Dimensions and loads
This standard specifies the characteristics, of double row self aligning ball bearings of diameter series 2 1) designed to withstand only slow rotations and oscillations under load. They are intended for use between fixed and moving parts of the aircraft structure and their control mechanisms.
2 Fields of application
The airframe roller bearings defined in the present standard shall be used from – 54 to + 150 °C.
However, being lubricated with the following greases:
— very high pressure grease, ester type (code A), operational range – 73 to + 121 °C or
— very high pressure grease, synthetic hydrocarbons, general purpose (code B), operational range – 54
to + 177 °C (refer to EN 2063),
their field of application when lubricated with code A grease shall be limited to + 121 °C.
3 References
ISO 15:1981, Rolling bearings — Radial bearings — Boundary dimensions — General plan.
ISO/R 201:1961, Rolling bearings — Radial internal clearance in unloaded radial groove type ball bearings with cylindrical bore — Values.
EN 2030, Steel FE-PM43, Hardened and tempered, Bars D = 150 mm.
EN 2063, Bearings, airframe rolling — Technical Specification.
4 Definitions
Self aligning ball bearings, full complement (without cage), double row.
5 Symbols
% ds = the deviation of a single bore diameter
% Ds = the deviation of a single outside diameter
% dmp = single plane mean bore diameter deviation
% Dmp = single plane mean outside diameter deviation
C s = permissible static radial load
F a = bearing axial load = axial component of actual bearing load
F a max = permissible static axial load
F r = static radial load
P or = static equivalent radial load
Y s = coefficient of axial load.
6 Materials
Inner ring: Corrosion resisting steel EN 2030, T 58 HRC.
Outer ring: Corrosion resisting steel EN 2030, T 58 HRC.
Balls: Corrosion resisting steel EN 2030, T 58 HRC.
Shields: Corrosion resisting material
Seals: Polytetrafluoroethylene (PTFE);
or polytetrafluoroethylene (PTFE) — glass fibre reinforced plastic material.
7 Required characteristics
7.1 Dimensions — Tolerances — Clearances — Loads — Mass
Configuration shall correspond with the Figure. Dimensions shall correspond with the Table. Bearings can be assembled with either seals or shields.
7.2 Surface roughness
R a = 0,2 4m for the raceway and rolling elements.
R a = 0,8 4m for the bore, side faces and cylindrical outer surface.
8 Designation
Each bearing shall only be designated as in the following example:
where the following codes are applied:
Greases: A = ester type grease
B = synthetic hydrocarbon type grease
Types: E = with seals
P = with shields
Clearances: L = internal radial clearance, group 3
N = internal radial clearance, normal group
NOTE If necessary, the originator code S 9005 may be introduced between the description block and the identity block.
9 Marking
In addition to the manufacturers’ own marking, each bearing shall be marked, on one side face only using the identity block as defined in clause 8 of this standard.
Marking position and method are at the manufacturer’s option.
10 Technical specification
Bearings supplied to this standard shall conform with the requirements of EN 2063.BS EN 2017 pdf download.