Turbocharger bearing arrangement

摘要

A turbocharger includes a main housing (1) for housing a turbine rotor (2) and a compressor impeller (4). An independent bearing box (23) is provided in the main housing (1). The main housing (1) is comprised of a turbine housing (3) and a compressor housing (5). A rotating shaft (7) connecting the turbine rotor (2) with the compressor impeller (4) is supported by a semi-float bearing metal (24) placed in the bearing box (23). An oil passage (26) is formed in the main housing (1) for feeding an oil to inside and outside of the semi-float bearing metal (24) in the bearing box (23). Oil grooves (37) are formed in end faces of the bearing metal (24) and another grooves (34) are formed at end faces of the bearing box (23) for discharging the oil from the semi-float bearing metal (24). Oil flow in the turbocharger housing (1) is controlled by the oil grooves (34, 37).