Gear Worm Groove Structure for Lubrication and Self-Locking

The patent applies local quality by creating circumferential grooves only in specific regions of the worm tooth flanks, rather than uniform axial grooves. The grooves are positioned to provide lubrication at highly loaded areas while leaving other regions with direct contact capability for self-locking. This localized approach allows different regions of the same component to have different functional qualities - lubrication zones and friction zones coexist on the worm tooth flanks.

The patent implements periodic action through the circumferential groove structure that intermittently supplies lubricant to the toothing system. As the worm rotates, the grooves periodically deliver lubricant to contact points, creating a rhythm of lubrication and friction. This periodic lubrication provides wear protection during operation while allowing friction-dominated self-locking behavior during standstill periods when no lubricant is being actively supplied.

The patent combines roller burnishing with selective groove creation to achieve local quality. The burnished smooth surface provides wear resistance, while circumferential grooves are introduced in specific locations to maintain self-locking capability. This creates a dual-character surface: predominantly smooth and wear-resistant, with localized rougher groove regions that promote friction and self-locking during standstill.

The patent applies parameter changes by optimizing groove depth, width, and spacing as controllable variables. Rather than maximizing groove depth unilaterally, the invention treats groove dimensions as parameters that can be adjusted to achieve the desired balance between lubrication and self-locking. The groove depth is specifically controlled to provide sufficient lubricant capacity while maintaining enough material between grooves to ensure direct contact and self-locking capability.