| abstract |
(57) [Abstract] [Purpose] In a hermetic compressor in which the main journal bearing portion of the crankshaft is supported in a cantilever manner from a frame having a sliding bearing portion, there is no seizure on the bearing portion even if alternative CFC gas is used as a refrigerant. It is to realize a highly reliable hermetic compressor. [Structure] The main journal portion 6b of the crankshaft 6 and the contact portion of the concentrated load portion on the compression mechanism portion side of the slide bearing portion 7a of the frame 7 are in surface contact with each other through the oil film 5, for example, within a clearance. The taper portion 18 corresponding to the inclination of the crankshaft 6 is provided in at least one of the crankshaft main journal portion 6b and the frame slide bearing portion 7a to have a hermetic compressor structure. [Effect] The oil film does not break, and the crankshaft and frame do not come into direct metal contact, causing wear and seizure. It is possible to reduce the cost by omitting the surface treatment that was required in the past, and to improve the reliability of refrigeration and air-conditioning systems that use CFC substitutes. |