| 摘要 |
<p>A rotor (16) includes a cylindrical portion (30), a front wall (35), and first and second rotor arms (31,32). The front wall (35) is formed on an inner periphery of the cylindrical portion (30) near its front end. The first and second rotor arms (31,32) are arranged opposite one another on the sides of the cylindrical portion (30). The front wall (35) includes a link portion (35a) and a disk portion (35b). The outer periphery of the cylindrical portion (30) where the link portion (35a) is linked is overlaid by the spool (4) when the spool (4) is at a foremost position. The disk portion (35b) is integrally linked to the link portion (35a). The link portion (35a) includes an annular portion (35c) and a tapered portion (35d). The annular portion (35c) is linked to the inner periphery of the cylindrical portion (30) at its front end. The tapered portion (35d) is linked to the inner periphery of the annular portion (35c) and is tapered so that its diameter rearwardly decreases.
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