| 摘要 |
PROBLEM TO BE SOLVED: To eliminate troublesomeness of work for correctly meshing respective gears at assembling work, and to prevent easiness to flaw tooth parts by rubbing of the mutual tooth parts when assembling the gears in a power transmission device using the plural gears. SOLUTION: Projecting parts 21 and 22 having conical surfaces 21b and 22b are integrally formed on upper and lower end surfaces of the tooth parts 14 and 15 of the gears 10 and 11. When meshing the gears 10 and 11, the tooth part 14 and the tooth part 15 surely mesh with each other by the guiding action of the conical surfaces 21b and 22b only by moving one gear in the shaft direction.
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