| 摘要 |
A worm and meshing worm gear are provided. The worm has oppositely tapered frustoconical portions at either end thereof. The angle of taper of the two tapered portions is the same, but in different directions. The angle of taper is substantially equal to 360 degrees divided by the number of teeth in the worm gear. Contact between the worm and gear occurs over a plurality of teeth as contrasted with substantially only one tooth in the conventional cylindrical worm. The worm is capable of being formed by thread rolling.
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