| 摘要 |
A small power hermetic motor-compressor suitable for use in an electric refrigerator having a compression mechanism section and a driving electric motor section combined together and confined in a closed container. The compression mechanism section and the driving electric motor section are connected to each other by means of a rotor shaft manufactured through a plastic working of a single steel pipe blank. The rotor shaft has a journal section adapted to be slidingly held by a cooperative bearing section provided on the stationary part of the compressor. A plurality of oil grooves of a relatively small length are press-formed on the outer peripheral surface of the rotor shaft from the outside thereof. At least one of the oil grooves is provided with an oil passage bore formed through the thickness of the rotor shaft, so that the lubricating oil sucked up along the inner peripheral wall of the rotor shaft is allowed to come out of the rotor shaft and get into the oil groove. The journal section or the cooperative bearing surface may be provided with at least one oil holding section connecting the adjacent oil grooves for the delivery of the oil from one to the other groove. The journal section can have a gas purging port for expelling the gas or vapor of the oil out of the bearing section.
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