| 摘要 |
PROBLEM TO BE SOLVED: To cool a main bearing from an inner peripheral side with the usage of cooling air flowing in a casing, and enhance heat resistance by providing a cooling air passage in a driving shaft. SOLUTION: The driving shaft 8 rotated and driven by a motor 15 is connected to a connection part 3C of a rotating scroll 3, and the driving shaft 8 is constituted by a main shaft part 9 and a joint part 13. A cooling air passage 26 is provided in the main shaft part 9, and an auxiliary cooling air passage 27 and an inlet side opening 28 are provided in the connection part 3C. An outlet side opening 29 is provided in the joint part 13. When a cooling fan 19 is operated, the cooling air to arrows A, B, C and D directions is generated, and a fixing scroll 2, the rotating scroll 3, and an auxiliary crank 7 are cooled. At that time, a part of the cooling air is made to flow into the cooling air passages 26 and 27 as shown in arrows P and Q, thereby effectively cooling the main bearings 10 and 11 and a rotating bearing 12. COPYRIGHT: (C)2007,JPO&INPIT
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