BS EN 4854-3 pdf free download
BS EN 4854-3-2019 pdf free download.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 Part 3: Technical specification.
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. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 4854-1, 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, narrow series — Part 1: Dimensions and loads EN 4854-2, 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, wide series — Part 2: Dimensions and loads EN 10204, Metallic products — Types of inspection documents MIL-PRF-87257B, Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft and Missile NSA307110, Fluid — Hydraulic Phosphate Ester — Base Fire Resistant TR 4475, Bearings and mechanical transmissions for airframe applications — Vocabulary 1 ASTM D 1655, Specification for Aviation Turbine Fuels
3 Terms and definitions For the purposes of this document, the terms and definitions given in TR 4475 and the following apply. No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at http://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 3.1 self-lubricated spherical plain bearing, self-aligning in corrosion resistant steel with and without staking groove bearing consisting of two concentric rings, between which is interposed a self-lubricating liner which is bonded or moulded on the spherical surface of the outer ring (race) Note 1 to entry: The width of the inner ring (ball) is greater than the width of the outer ring (race), so that a tilting movement is possible in addition to the rotational movement. Note 2 to entry: The outer ring (race) has no assembly slot but may have staking grooves for mechanical swaging. 3.2 surface discontinuities see TR 4475 (surface imperfections) 3.3 starting torque without load torque required to start the rotation of the inner ring (ball) with the outer ring (race) held stationary 3.4 friction coefficient coefficient of the torque moment and the product of the load on the bearing and the inner spherical ring (ball) radius.BS EN 4854-3 pdf download.
