| 摘要 |
Oil supply grooves (74, 84) are formed in the rotary shaft (70) of a compression mechanism (50) and the rotary shaft (80) of an expansion mechanism (60) that are integrated with an electric motor (40). Both rotary shafts (70, 80) are coupled by fitting together a fitting protrusion (85) and a fitting recess (75) that are formed at respective shaft ends. A seal groove (S) is formed in the circumferential surface of the protrusion (85), and an O-ring (R) is fitted in the seal groove (S). Consequently, leakage of lubricant can be prevented between the protrusion (85) and the recess (75).
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