EN 2079-1995 pdf download.Aerospace series Bearings, precision ball with flange in corrosion resisting steel, for instruments and equipment Dimensions and loads.
This EN 2079 specifies the required characteristics for precision ball bearings in corrosion resisting steel:
— with flange;
— with radial contact;
— with deep groove;
— without filling slot;
for use in instruments and aircraft equipment.
2 Normative references
This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
Iso 15, Rolling bearings — Radial bearings — Boundary dimensions — General plan. ISO 1132, Rolling hearings — Tolerances — Definitions.
ISO 1224, Rolling bearings — Instrument precision bearings.
EN 2030, Steel FE-PM43 — Hardened and tempered — Bars D ≤ 150 mm — Aerospace series. EN 2130, Aerospace series — Precision ball bearings in corrosion resisting st eel for instruments and equipment — Technical specification2.
3 Symbols
The following symbols are in conformity with ISO 1224. Definitions to Iso 1132.
d : Nominal bore diameter
: Deviation of a single bore diameter
iImp : Single plane mean bore diameter variation
Bore diameter variation in a single radial plane
: Mean bore diameter variation
D : Nominal outside diameter
SI). : Deviation of a single outside diameter
Dmp : Single plane mean outside diameter deviation
V : Outside diameter variation in a single radial plane
VI)mp : Mean outside diameter variation
D, : Nominal outside diameter of the outer ring flange
Deviation of a single outside diameter of the outer ring flange
B : Nominal width of the rings
Deviation of a single ring width
: Variation in the width of the rings
C1 : Nominal outer ring flange width
Deviation of a single outer ring flange width
VC1. Outer ring flange width variation
r mm. : Smallest single chamfer dimension
r,, max. Largest single chamfer dimension
Kia : Radial runout of assembled bearing inner ring
K : Radial runout of assembled bearing outer ring
Sd : Face runout with bore
Sdl : Variation of bore generatrix inclination with face
So : Variation of outside surface generatrix inclination with face Assembled bearing inner ring face runout with raceway
Assembled bearing outer ring face runout with raceway
S1 : Assembled bearing outer ring flange back face runout with raceway
4 Required characteristics
4.1 Materials
Rings and balls: steel EN 2030; minimum hardness = 650 HV5
Cage, shields and circlips: corrosion resisting steel
Seals: polytetrafluorethylene (PTFE) or PTFE plastic material reinforced with glass fibre
4.2 Dimensions — Radial clearance — Tolerances — Loads
Configuration: see Figure 1 and Figure 2; the design and mounting of shields and seals (Figure 2) and the
choice of cage design are at the discretion of the manufacturer.
Dimensions: see Table 1.
Clearances: see Table 2 and Table 3.
Tolerances: see Table 4, Table 5, Table 6 and Table 7.
Loads: see Table 8.
4.3 Lubrication
— Esther type grease: code I
— Synthetic oil: code 2
For essential characteristics: see EN 2130
4.4 Surface roughness — Closure type
See Figure 1 and Figure 2.EN 2079-1995 pdf download.