To simplify processes and reduce a manufacturing cost without losing easiness of assembling, by fitting the inner circumference of the edge of a yoke with a separator and a bottom plate using a tongue and a groove,and by fitting the outer peripheral edge of the separator with the inner circumference of a covering member using a tongue and a groove.
The inner circumference of the right edge of a yoke 44 is fitted with a tongue groove part 11a which as formed with steps projecting in the shaft direction of a bottom plate 11. The inner circumference of the left edge of the yoke 44 is fitted with a tongue groove part 43b which is formed with steps projecting in the plural shaft directions of a separator 43. Furthermore, the outer peripheral edge 43c of a separator 43 is fitted with a tongue groove part 17b which is formed with steps projecting in the inner peripheral face of a gear cover 17. In other words, the separator 43, the yoke 44, and the bottom plate 11 are relatively positioned by a tongue groove fitting, the gear cover 17 and the separator 43 are relatively positioned by the tongue groove fitting, and therefore, they are centered.
OKADA MICHIO
OYA MASAAKI
SATO YOSHIKAZU
NAGASHIMA SHINICHI
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