Patent ID: 8033196
Filing Date: 2011-10-11
Classification: F16H,Y10S,Y10T

Abstract:
1. A resin double helical gear pair comprising: a first resin double helical gear; and a second resin double helical gear gearing into the first double helical gear, wherein the first double helical gear has a diameter smaller than a diameter of the second double helical gear, the first double helical gear is formed so that at least an addendum modification coefficient of a peak of a chevron tooth is larger than addendum modification coefficients of other sections of said chevron tooth, and the second double helical gear is formed so that a sum of the addendum modification coefficient of the first double helical gear and an addendum modification coefficient of the second double helical gear in a gearing position of the first double helical gear and the second double helical gear is a constant value along a tooth width direction; whereby the strength and life of the first and second resin double helical gears are increased.