| 摘要 |
A pitch radius of a worm tooth decreases toward an axial center of a worm. A first side flank of the tooth is defined such that a normal line to the first side flank is angled relative to an axial line in a longitudinal cross section of the worm. The normal line is normal to the first side flank at a contact point between a pitch line of the worm tooth and the first side flank. The axial line is parallel to a central axis of the worm and extends through the contact point. An angle between the normal line and the axial line at the first side flank is generally constant throughout an entire axial extent of the worm.
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