| 摘要 |
A coolant inlet and a coolant outlet are opened on an inner surface enclosing an inner space of a rotation object. The coolant inlet and the coolant outlet are located on a rotation axis and face each other. A main-stream which flows straightly along the rotation axis from the coolant inlet to the coolant outlet is generated in a central space of the inner space. Therefore, a resistance about the coolant stream is small. In addition, a sub-stream which circulates in a radial direction is generated in a peripheral space around the central space. By generating a contact between the main-stream and the sub-stream, it is possible to obtain high performance of cooling.
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