Abstract: Previous studies on lubrication of floating ring bearing in turbocharger are neglected the heat transfer among the journal, floating ring and bearing block, making it away from the real lubrication and frictional characteristic. The model of heat transfer among the journal, floating ring and bearing block is established. Based on the Reynolds equation and floating ring balance equation, the lubrication model of floating ring bearing is established and the lubrication and heat dissipation performance of floating ring is analyzed at the same time. The effect of floating ring thickness, outer clearance, inner round width and outer round width on performance is studied. Results show that lubrication and heat dissipation performance of floating ring can be improved remarkably by decreasing floating ring thickness; outer clearance increases can decrease the floating ring temperature and improve the heat dissipation performance of floating ring; the more the inner circle width, the larger the floating ring speed, inner film temperature, floating ring temperature, power dissipation and heat dissipating capacity of bearing block; the more the outer circle width, the larger the floating ring speed and heat dissipating capacity of bearing block. The viscosity-pressure relationship has little relationship on the lubrication and heat dissipation performance.

Key words: floating ring bearing, floating ring temperature, heat dissipation, lubrication, viscosity-pressure relationship