| 摘要 |
PROBLEM TO BE SOLVED: To reduce vibration caused by a rotation transmission error of a gear and vibration caused by backlash without deteriorating assembling performance. SOLUTION: The gear which comprises two pairs of gears with their teeth formed at their external circumferences in the longitudinal direction of a rotary shaft and keeps the pair of gears integrated to each other with their tooth phases displaced from each other by an amount of a half tooth is characterized in that the two pairs of gears constitute a cylindrical part which is longer than the tooth width of the gear and has a diameter smaller than a tooth-bottom circular diameter of the gear. The gear is also characterized in that a thin-walled part for reducing twisting rigidity between the gears is formed at a part of the cylindrical part with the tooth phase between the gears properly set, thus assembling the gear by being charged in the rotative direction with respect to the engaged gears. COPYRIGHT: (C)2007,JPO&INPIT
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