| 摘要 |
In order that a worm 1 is rotated, a clearance (a region constituting a clearance portion between bearings and a worm gear) is formed (FIGS. 4 ( 1 ) to ( 3 )) in an upper surface of a base plate 3 . A mold 12 for forming a lower half region of the worm therein is formed (FIG. 4 ( 8 )). A material 5 for the worm is deposited (FIG. 4 ( 9 )) to a height equal to that of a lower half region plus that of an upper half of the worm. An upper half of the worm is formed (FIGS. 4 ( 10 ) to ( 12 ). Finally, the material 13 in the clearance between the base plate 3 and gear 1 is removed (FIG. 4 ( 13 )).
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