Globoid Worm Edge Tooth Geometry for Torque and Wheel Protection

The patent applies local quality by differentiating the tooth height across different regions of the worm. The central region maintains full tooth height for optimal load transmission, while the outer edge regions have reduced tooth height to prevent damage to the worm wheel. This spatial variation in tooth geometry allows each region to perform its specific function optimally without compromising the other.

The patent segments the worm's tooth structure into distinct zones: a central region with full-height teeth for primary load bearing, and outer edge regions with reduced-height teeth for protective engagement. This segmentation allows the system to simultaneously achieve high load capacity in the critical central area while preventing harmful effects at the boundaries through the modified outer teeth.

The patent applies partial globoidal geometry to the worm, creating a hybrid form that is neither fully cylindrical nor fully globoidal. The central region maintains the load-transmitting advantages of globoidal geometry with multiple simultaneous tooth engagements, while the outer regions transition to a simpler form that limits engagement to prevent damage. This partial application of globoidal features achieves an optimal balance between manufacturing complexity and performance.