BEARING DEVICE AND EXHAUST GAS TURBOCHARGER

摘要

PROBLEM TO BE SOLVED: To provide a bearing for an exhaust gas turbocharger, which reduces an oil whirl phenomenon.SOLUTION: A bearing device comprises a first bearing body. The first bearing body 9 has a first receiving opening 10 that receives a first rotation body 8. A first gap 12 is defined between a first inner peripheral surface 14 of the first bearing body 9 and a first outer peripheral surface 13 of the first rotation body 8. A lubrication oil supply flow passage 11 is formed in the first bearing body 9. The lubrication oil supply flow passage communicates with the first receiving opening to allow inflow from the lubrication oil supply flow passage to the first receiving opening via a communication opening 20 of the lubrication oil supply flow passage 11, that is opened in the first receiving opening. Lubrication oil is supplied to the first gap via the lubrication oil supply flow passage. The lubrication oil supply flow passage 11 is formed to impose a circumferential speed component on a flow of the lubrication oil in order to perform orientation of a flow speed (v) of the lubrication oil after imposing of the circumferential speed component.SELECTED DRAWING: Figure 2