1996 年 62 巻 594 号 p. 665-671
This paper describes the characteristics of journal bearings lubricated with a mixture of refrigerant and lubricating oil under similar operating conditions to those in compressors for household refrigerators, The purpose of this study is to clarify the difference in journal bearing characteristics between lubricating oils in which refrigerants HFC-134a and CFC-12 are dissolved, and the effect of refrigerant solubility in the oil on the bearing characteristics. The combinations of refrigerant and oil used in this study were H-FC-134a/ester, CFC-12/mineral which had high refrigerant solubility, and HFC 134a/alkyl benzene which had low refrigerant solubility. Experiments for these combinations were performed by using a journal test machine under different conditions of pressure and temperature. In conclusion, (1) in the fluid lubrication zone, there is no significant difference in journal bearing characteristics between the combinations of HFC-134a/ester, CFC-12/mineral, and HFC-134a/alkyl benzene, and (2) in the boundary lubrication zone, HFC-134a/alkyl benzene has better journal characteristics than HFC-134a/ester and CFC-12/mineral because of lower refrigerant solubility.