| 摘要 |
<p>A turbocharger (1) is provided with a rotor shaft (7) to which a turbine wheel (6) and a compressor wheel (8) are coupled and a semi-floating bearing (50) arranged in a bearing chamber (20) and rotatably supporting the rotor shaft (7). The semi-floating bearing (50) has a pair of bearing portions (51,52) located at two longitudinal ends. A region between the pair of bearing portions (51,52) in an outer peripheral surface of the semi-floating bearing (50) and an inner peripheral surface of the bearing chamber (20) constitute an outside oil feed chamber (80) to supply a lubricant oil to outer peripheral surfaces of the pair of bearing portions (51,52). A groove (71) extending in a circumferential direction is formed in the outer peripheral surface of at least one of the bearing portions (51,52). An oil feed passage (81) to supply the lubricant oil to the outside oil feed chamber (80) and a discharge passage (61) opposed to the groove (71) and configured to discharge the lubricant oil in the groove (71) downward are formed in the bearing housing (11).</p> |
