| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability by reducing abrasion due to metal-to-metal contact on a thrust sliding, even in a state that the supply of refrigerating machine oil to the thrust sliding surface is insufficient in times of starting, low-speed operation and so on, in the centrifugal pump effect of an oil feeding mechanism installed in a shaft. SOLUTION: A flange lower end sliding surface 30 and a thrust upper end sliding surface 31 constituting a thrust bearing 32 are formed into a conical surface bearing construction. Since a thrust sliding part is formed into the conical surface bearing, an oil film is made up in space between the flange lower end sliding surface 30 and the thrust upper end sliding surface 31 by rotation of a shaft 2 in an easy manner by a squeeze film action, just like a journal bearing. Therefore metal-to-metal contact is prevented from occurring, and thus a reduction in abrasion is realizable.
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