| 摘要 |
A base plate is formed by press processing by cutting out a bottom portion and a side wall portion connected integrally with the bottom portion, and a rotating-shaft insertion hole is formed thereon. The side wall portion is bent at a border portion where the side wall portion is connected to the bottom portion and is curved around the bottom portion, and further both end portions of the side wall portion in the transverse direction are connected to each other. As a result, a cylinder-shaped yoke is formed.
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