| 摘要 |
<P>PROBLEM TO BE SOLVED: To inhibit whirl noise in a turbocharger of a structure supporting a turbine shaft by a floating bush bearing. <P>SOLUTION: Oil supply passes (an oil passage 11 and an oil supply hole 13, an oil passage 12 and an oil supply hole 14) for individually supplying oil of different pressure to a floating bush bearing 7 on a turbine side and a floating bush bearing 8 on a compressor side are provided to keep pressure of oil supplied to the floating bush bearing 8 on the compressor side higher than pressure of oil supplied to the floating bush bearing 7 on the turbine side, and to keep a spring constant of oil film in the floating bush bearing 8 on the compressor side larger. Consequently, whirl noise due to self-excited vibration of a cylinder mode is not easily generated since run out quantity on the compressor side of the turbine shaft 3 is reduced by adjusting the spring constant of oil film of the floating bush bearings 7, 8. <P>COPYRIGHT: (C)2007,JPO&INPIT |
