| 摘要 |
It is intended to reduce friction loss during low-speed rotation and increase supercharging pressure in the low-speed rotational range of a turbocharger by providing a pressure-receiving section, which generates pressure by catching the flow of lubricating oil, at a position on the inner peripheral surface of a floating bush not communicating with an oil supply hole that interconnects the inner and outer peripheral surfaces of the floating bush so as to cause the floating bush to co-rotate with a rotor shaft at a early stage of the low-speed rotational range. Provided are a bearing housing 13 having a bearing portion 13d of the turbocharger 1, a rotor shaft 16 penetrating the interior of the bearing housing 13, a floating bush 19 interposed between the bearing portion 13d and the rotor shaft 16 and configured to supply lubricating oil to an outer peripheral surface 19b and an inner peripheral surface 19c via an oil supply hole 19a interconnecting the outer and inner peripheral surfaces 19b, 19c, and a pressure receiving part 25 for generating pressure by catching the flow of the lubricating oil, which is provided at a position on the inner peripheral surface 19c of the floating bush 19 not communicating with the oil supply hole 19a. |
