| 摘要 |
<p>In a resin backlashless gear 1, the radial outer portions 7, 8 of first and second gear portions 3, 4 are connected to a radial inner portion 2 by means of radial ribs 10, 11 so as to be capable of being displaced in rotational directions. The elastic deformation of the radial ribs 10, 11 decreases the dislocation of the teeth 5, 6 of the first and second gear portions 3, 4 in pitch circle directions so that the dislocation is equal to backlash to cause the teeth 5, 6 of the first and second gear portions 3, 4 to elastically contact the teeth of a companion gear meshing with the resin gear to absorb the backlash.
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