Patent ID: 8226351
Filing Date: 2012-07-24
Classification: F01D,F02B,F02C

Abstract:
1. A lubrication system for turbocharger(s) to ensure continuous lubrication of bearings and shaft of the turbocharger with lubricant retention during start and shut down of turbocharger-associated systems comprising a turbine housing, a compressor housing, and a bearing housing disposed between the turbine and compressor housings, with the turbine housing and compressor housings held on either side by a connecting means, a turbine wheel mounted on a shaft in a turbine housing wherein the shaft extends through the bearing housing ( a compressor wheel in the compressor housing mounted at the distal end of the shaft and is supported in the bearing housing, a pair of floating journal bearings on either end of the bearing housing to support the rotating shaft, seals at the both ends of bearing housing near the floating journal bearings to prevent the entry of the exhaust gas and compressed air into the bearing housing and to further absorb any axial thrust load, which comes on the rotating shaft, a non return valve [NRV] or one way valve in an oil inlet pipe line with opening and/or closing pressure less than oil pressure during idle running of an engine, an oil outlet line so constructed to retain sufficient quantity of lubricating oil thereby allowing adequate lubrication of the shaft and bearings after engine/vehicle shutdown wherein an oil outlet pipe having one end thereof connected to a turbocharger oil outlet and extends downwardly therefrom and forms a first inflection point (A), and from said first inflection point (A) the oil outlet pipe inflects upwardly and forms a second inflection point (B) which is positioned at a level around the center of the shaft, and extends downwardly with another end going to oil sump, thereby to retain a sufficient amount of oil at turbocharger shaft and bearing portion by maintaining oil between the turbocharger oil outlet and second inflection point (B) in the oil outlet line even after an engine lubrication oil pump is shut off to ensure adequate lubrication at the earliest moment when the engine starts again.