| 摘要 |
PROBLEM TO BE SOLVED: To prevent abrasion and an abnormal sound of a curved rack gear and a curved pinion gear caused by the occurrence of dislocation in a meshing reference with the curved rack gear by a phenomenon that a reference pitch circle of the curved pinion gear vertically causes pitching, in a driving device used for a lifting machine for curved stairs. SOLUTION: The manufacturing method of this driving device manufactures the curved rack gear 1 by twisting in a curved shape after performing double helical cutting by an angle and a pitch of adding a correction corresponding to twisting in the curved shape to a straight line-shaped raw material, instead of manufacturing the curved rack gear 1 by cutting a curved-shaped raw material, and manufactures the corresponding curved pinion gear by performing helical gear cutting by an angle and a pitch of respectively doubling the angle and the pitch. COPYRIGHT: (C)2011,JPO&INPIT
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