| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for maintaining the strength by preventing the opening of a cavity even when the cavity is generated during casting in a part in the vicinity of a rotating shaft support to which a load is applied, and a configuration capable of successfully supporting an outer rotor of a bearing in a bearing formed by the means, in a crankcase which is formed by casting and to which cutting is applied after the casting. SOLUTION: During the casting, part of a cutting work part is recessed to form a recess, and an oil passage is formed adjacent to the cutting work part. The recess is provided in a section where a distance between the oil passage and the cutting work part becomes shortest. When the inner peripheral face of an annular support part is cut, the inner face side of the recess is left without cutting work. COPYRIGHT: (C)2010,JPO&INPIT
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