| 摘要 |
In a resin double-helical gear formed by injection-molding, smooth meshing of teeth can be performed for rotation of the resin double-helical gear in both directions, and occurrences of thrust-direction load and noise can be prevented. Peak-side tooth flanks 7 c and 7 d and valley-side tooth flanks 7 e and 7 f of a tooth 7 in a resin double-helical gear 1 are formed such as to become farther away from peak-side tooth flanks 9 c and 9 d and valley-side tooth flanks 9 e and 9 f of a standard tooth 9 in an inward direction, the closer the peak-side tooth flanks 7 c and 7 d and the valley-side tooth flanks 7 e and 7 f are to a tooth width direction center section 3 from one tooth width direction end section 4 a and another tooth width direction end section 4 b. As a result, meshing escape sections g (g 1 and g 2 ) and h (h 1 and h 2 ) having dimensions in a tooth thickness direction that increase towards the tooth width direction center section 3 are formed on the peak-side tooth flank side and the valley-side tooth flank side.
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