主权项 |
1. A worm gear mechanism comprising a worm and a worm wheel meshed with the worm, wherein
at least an addendum surface of a tooth of the worm is formed into an arc shape, and a center of a radius of an arc of the addendum surface is positioned nearer to a center line of the worm than a pitch line of the worm, the worm wheel is gear cut by a hob used in gear cutting of the worm wheel, at least an addendum surface of a tooth of the hob being formed into an arc shape, and a center of a radius of an arc of the addendum surface being positioned nearer to a center line of the hob than a pitch line of the hob, and a length of recess path of the worm gear mechanism, in which the worm is meshed with the worm wheel, is set to be larger than a length of recess path of the worm gear mechanism having an involute profile worm and a involute profile worm wheel. |