February 20, 2018
Plain Bearings for Aerospace Applications Article
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Mounted on the engine crankshaft, isolator pulley dampers transmit torque to the rubber belt that drives the various engine accessories such as the alternator, the HVAC compressor and the oil and water pumps.
Out-of-balance forces generated by the pistons in the engine, particularly at low idling speeds, transmit asynchronous vibrations to the distribution belt which can ; be felt by the occupants in the car, create noise and reduce the service life of the belt.
To support the belt load applied to the pulley, to reduce NVH (Noise, Vibration and Harshness) and to increase belt life, isolator pulley dampers are fitted with GGB DP11 metal polymer self-lubricating plain bushings.
The structure of GGB DP11 self-lubricating bearings consists of a strong steel backing, to which is bonded a porous bronze sinter interlayer impregnated and overlaid with a PTFE enriched wear resistant bearing layer.
This highly resistant composite bearing structure can withstand specific loads of up to 250 MPa / 36 000 psi, sliding speeds up to 2.5 ms-1 / 500 fpm and temperatures up to 280°C / 536°F.
In isolator pulley damper applications, the excellent antifriction properties of GGB DP11 self-lubricating bearings provide the following benefits:
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