| 摘要 |
A rotary machine is provided with: a crankshaft (106); a bearing housing (107a) which has a through-hole (107b); and a main bearing (108) which is disposed within the through-hole (107b) and which slides relative to the outer peripheral surface of the crankshaft (106) with lubricating oil therebetween. The main bearing (108) has an upper bush (120), a lower bush (122), and an intermediate bush (121) which is disposed between the upper bush (120) and the lower bush (122). The intermediate bush (121) has a higher linear expansion coefficient than the bearing housing (107a), the upper bush (120), and the lower bush (122), and before the start of rotation of at least the crankshaft (106), the gap between the intermediate bush (121) and the outer peripheral surface of the crankshaft (106) is greater than the gap between the intermediate bush (121) and the upper bush (120) and the gap between the intermediate bush (121) and the lower bush (122). As a result of this configuration, bearing loss during fluid lubrication can be reduced and the reliability as the bearing can be maintained even during high-load operation. |
